2 * Faraday FOTG210 EHCI-like driver
4 * Copyright (c) 2013 Faraday Technology Corporation
6 * Author: Yuan-Hsin Chen <yhchen@faraday-tech.com>
7 * Feng-Hsin Chiang <john453@faraday-tech.com>
8 * Po-Yu Chuang <ratbert.chuang@gmail.com>
10 * Most of code borrowed from the Linux-3.7 EHCI driver
12 * This program is free software; you can redistribute it and/or modify it
13 * under the terms of the GNU General Public License as published by the
14 * Free Software Foundation; either version 2 of the License, or (at your
15 * option) any later version.
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
19 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software Foundation,
24 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/module.h>
27 #include <linux/device.h>
28 #include <linux/dmapool.h>
29 #include <linux/kernel.h>
30 #include <linux/delay.h>
31 #include <linux/ioport.h>
32 #include <linux/sched.h>
33 #include <linux/vmalloc.h>
34 #include <linux/errno.h>
35 #include <linux/init.h>
36 #include <linux/hrtimer.h>
37 #include <linux/list.h>
38 #include <linux/interrupt.h>
39 #include <linux/usb.h>
40 #include <linux/usb/hcd.h>
41 #include <linux/moduleparam.h>
42 #include <linux/dma-mapping.h>
43 #include <linux/debugfs.h>
44 #include <linux/slab.h>
45 #include <linux/uaccess.h>
46 #include <linux/platform_device.h>
49 #include <asm/byteorder.h>
51 #include <asm/unaligned.h>
53 /*-------------------------------------------------------------------------*/
54 #define DRIVER_AUTHOR "Yuan-Hsin Chen"
55 #define DRIVER_DESC "FOTG210 Host Controller (EHCI) Driver"
57 static const char hcd_name[] = "fotg210_hcd";
59 #undef FOTG210_URB_TRACE
63 /* magic numbers that can affect system performance */
64 #define FOTG210_TUNE_CERR 3 /* 0-3 qtd retries; 0 == don't stop */
65 #define FOTG210_TUNE_RL_HS 4 /* nak throttle; see 4.9 */
66 #define FOTG210_TUNE_RL_TT 0
67 #define FOTG210_TUNE_MULT_HS 1 /* 1-3 transactions/uframe; 4.10.3 */
68 #define FOTG210_TUNE_MULT_TT 1
70 * Some drivers think it's safe to schedule isochronous transfers more than
71 * 256 ms into the future (partly as a result of an old bug in the scheduling
72 * code). In an attempt to avoid trouble, we will use a minimum scheduling
73 * length of 512 frames instead of 256.
75 #define FOTG210_TUNE_FLS 1 /* (medium) 512-frame schedule */
77 /* Initial IRQ latency: faster than hw default */
78 static int log2_irq_thresh; /* 0 to 6 */
79 module_param(log2_irq_thresh, int, S_IRUGO);
80 MODULE_PARM_DESC(log2_irq_thresh, "log2 IRQ latency, 1-64 microframes");
82 /* initial park setting: slower than hw default */
84 module_param(park, uint, S_IRUGO);
85 MODULE_PARM_DESC(park, "park setting; 1-3 back-to-back async packets");
87 /* for link power management(LPM) feature */
88 static unsigned int hird;
89 module_param(hird, int, S_IRUGO);
90 MODULE_PARM_DESC(hird, "host initiated resume duration, +1 for each 75us");
92 #define INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)
96 /*-------------------------------------------------------------------------*/
98 #define fotg210_dbg(fotg210, fmt, args...) \
99 dev_dbg(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
100 #define fotg210_err(fotg210, fmt, args...) \
101 dev_err(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
102 #define fotg210_info(fotg210, fmt, args...) \
103 dev_info(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
104 #define fotg210_warn(fotg210, fmt, args...) \
105 dev_warn(fotg210_to_hcd(fotg210)->self.controller , fmt , ## args)
107 /* check the values in the HCSPARAMS register
108 * (host controller _Structural_ parameters)
109 * see EHCI spec, Table 2-4 for each value
111 static void dbg_hcs_params(struct fotg210_hcd *fotg210, char *label)
113 u32 params = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
116 "%s hcs_params 0x%x ports=%d\n",
122 /* check the values in the HCCPARAMS register
123 * (host controller _Capability_ parameters)
124 * see EHCI Spec, Table 2-5 for each value
126 static void dbg_hcc_params(struct fotg210_hcd *fotg210, char *label)
128 u32 params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
131 "%s hcc_params %04x uframes %s%s\n",
134 HCC_PGM_FRAMELISTLEN(params) ? "256/512/1024" : "1024",
135 HCC_CANPARK(params) ? " park" : "");
138 static void __maybe_unused
139 dbg_qtd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd)
141 fotg210_dbg(fotg210, "%s td %p n%08x %08x t%08x p0=%08x\n", label, qtd,
142 hc32_to_cpup(fotg210, &qtd->hw_next),
143 hc32_to_cpup(fotg210, &qtd->hw_alt_next),
144 hc32_to_cpup(fotg210, &qtd->hw_token),
145 hc32_to_cpup(fotg210, &qtd->hw_buf[0]));
147 fotg210_dbg(fotg210, " p1=%08x p2=%08x p3=%08x p4=%08x\n",
148 hc32_to_cpup(fotg210, &qtd->hw_buf[1]),
149 hc32_to_cpup(fotg210, &qtd->hw_buf[2]),
150 hc32_to_cpup(fotg210, &qtd->hw_buf[3]),
151 hc32_to_cpup(fotg210, &qtd->hw_buf[4]));
154 static void __maybe_unused
155 dbg_qh(const char *label, struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
157 struct fotg210_qh_hw *hw = qh->hw;
159 fotg210_dbg(fotg210, "%s qh %p n%08x info %x %x qtd %x\n", label,
160 qh, hw->hw_next, hw->hw_info1, hw->hw_info2, hw->hw_current);
161 dbg_qtd("overlay", fotg210, (struct fotg210_qtd *) &hw->hw_qtd_next);
164 static void __maybe_unused
165 dbg_itd(const char *label, struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
167 fotg210_dbg(fotg210, "%s[%d] itd %p, next %08x, urb %p\n",
168 label, itd->frame, itd, hc32_to_cpu(fotg210, itd->hw_next),
171 " trans: %08x %08x %08x %08x %08x %08x %08x %08x\n",
172 hc32_to_cpu(fotg210, itd->hw_transaction[0]),
173 hc32_to_cpu(fotg210, itd->hw_transaction[1]),
174 hc32_to_cpu(fotg210, itd->hw_transaction[2]),
175 hc32_to_cpu(fotg210, itd->hw_transaction[3]),
176 hc32_to_cpu(fotg210, itd->hw_transaction[4]),
177 hc32_to_cpu(fotg210, itd->hw_transaction[5]),
178 hc32_to_cpu(fotg210, itd->hw_transaction[6]),
179 hc32_to_cpu(fotg210, itd->hw_transaction[7]));
181 " buf: %08x %08x %08x %08x %08x %08x %08x\n",
182 hc32_to_cpu(fotg210, itd->hw_bufp[0]),
183 hc32_to_cpu(fotg210, itd->hw_bufp[1]),
184 hc32_to_cpu(fotg210, itd->hw_bufp[2]),
185 hc32_to_cpu(fotg210, itd->hw_bufp[3]),
186 hc32_to_cpu(fotg210, itd->hw_bufp[4]),
187 hc32_to_cpu(fotg210, itd->hw_bufp[5]),
188 hc32_to_cpu(fotg210, itd->hw_bufp[6]));
189 fotg210_dbg(fotg210, " index: %d %d %d %d %d %d %d %d\n",
190 itd->index[0], itd->index[1], itd->index[2],
191 itd->index[3], itd->index[4], itd->index[5],
192 itd->index[6], itd->index[7]);
195 static int __maybe_unused
196 dbg_status_buf(char *buf, unsigned len, const char *label, u32 status)
198 return scnprintf(buf, len,
199 "%s%sstatus %04x%s%s%s%s%s%s%s%s%s%s",
200 label, label[0] ? " " : "", status,
201 (status & STS_ASS) ? " Async" : "",
202 (status & STS_PSS) ? " Periodic" : "",
203 (status & STS_RECL) ? " Recl" : "",
204 (status & STS_HALT) ? " Halt" : "",
205 (status & STS_IAA) ? " IAA" : "",
206 (status & STS_FATAL) ? " FATAL" : "",
207 (status & STS_FLR) ? " FLR" : "",
208 (status & STS_PCD) ? " PCD" : "",
209 (status & STS_ERR) ? " ERR" : "",
210 (status & STS_INT) ? " INT" : ""
214 static int __maybe_unused
215 dbg_intr_buf(char *buf, unsigned len, const char *label, u32 enable)
217 return scnprintf(buf, len,
218 "%s%sintrenable %02x%s%s%s%s%s%s",
219 label, label[0] ? " " : "", enable,
220 (enable & STS_IAA) ? " IAA" : "",
221 (enable & STS_FATAL) ? " FATAL" : "",
222 (enable & STS_FLR) ? " FLR" : "",
223 (enable & STS_PCD) ? " PCD" : "",
224 (enable & STS_ERR) ? " ERR" : "",
225 (enable & STS_INT) ? " INT" : ""
229 static const char *const fls_strings[] = { "1024", "512", "256", "??" };
232 dbg_command_buf(char *buf, unsigned len, const char *label, u32 command)
234 return scnprintf(buf, len,
235 "%s%scommand %07x %s=%d ithresh=%d%s%s%s "
237 label, label[0] ? " " : "", command,
238 (command & CMD_PARK) ? " park" : "(park)",
239 CMD_PARK_CNT(command),
240 (command >> 16) & 0x3f,
241 (command & CMD_IAAD) ? " IAAD" : "",
242 (command & CMD_ASE) ? " Async" : "",
243 (command & CMD_PSE) ? " Periodic" : "",
244 fls_strings[(command >> 2) & 0x3],
245 (command & CMD_RESET) ? " Reset" : "",
246 (command & CMD_RUN) ? "RUN" : "HALT"
251 *dbg_port_buf(char *buf, unsigned len, const char *label, int port, u32 status)
255 /* signaling state */
256 switch (status & (3 << 10)) {
262 break; /* low speed */
272 "%s%sport:%d status %06x %d "
273 "sig=%s%s%s%s%s%s%s%s",
274 label, label[0] ? " " : "", port, status,
275 status>>25,/*device address */
277 (status & PORT_RESET) ? " RESET" : "",
278 (status & PORT_SUSPEND) ? " SUSPEND" : "",
279 (status & PORT_RESUME) ? " RESUME" : "",
280 (status & PORT_PEC) ? " PEC" : "",
281 (status & PORT_PE) ? " PE" : "",
282 (status & PORT_CSC) ? " CSC" : "",
283 (status & PORT_CONNECT) ? " CONNECT" : "");
287 /* functions have the "wrong" filename when they're output... */
288 #define dbg_status(fotg210, label, status) { \
290 dbg_status_buf(_buf, sizeof(_buf), label, status); \
291 fotg210_dbg(fotg210, "%s\n", _buf); \
294 #define dbg_cmd(fotg210, label, command) { \
296 dbg_command_buf(_buf, sizeof(_buf), label, command); \
297 fotg210_dbg(fotg210, "%s\n", _buf); \
300 #define dbg_port(fotg210, label, port, status) { \
302 fotg210_dbg(fotg210, "%s\n", dbg_port_buf(_buf, sizeof(_buf), label, port, status) ); \
305 /*-------------------------------------------------------------------------*/
307 /* troubleshooting help: expose state in debugfs */
309 static int debug_async_open(struct inode *, struct file *);
310 static int debug_periodic_open(struct inode *, struct file *);
311 static int debug_registers_open(struct inode *, struct file *);
312 static int debug_async_open(struct inode *, struct file *);
314 static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
315 static int debug_close(struct inode *, struct file *);
317 static const struct file_operations debug_async_fops = {
318 .owner = THIS_MODULE,
319 .open = debug_async_open,
320 .read = debug_output,
321 .release = debug_close,
322 .llseek = default_llseek,
324 static const struct file_operations debug_periodic_fops = {
325 .owner = THIS_MODULE,
326 .open = debug_periodic_open,
327 .read = debug_output,
328 .release = debug_close,
329 .llseek = default_llseek,
331 static const struct file_operations debug_registers_fops = {
332 .owner = THIS_MODULE,
333 .open = debug_registers_open,
334 .read = debug_output,
335 .release = debug_close,
336 .llseek = default_llseek,
339 static struct dentry *fotg210_debug_root;
341 struct debug_buffer {
342 ssize_t (*fill_func)(struct debug_buffer *); /* fill method */
344 struct mutex mutex; /* protect filling of buffer */
345 size_t count; /* number of characters filled into buffer */
350 #define speed_char(info1)({ char tmp; \
351 switch (info1 & (3 << 12)) { \
352 case QH_FULL_SPEED: \
356 case QH_HIGH_SPEED: \
362 static inline char token_mark(struct fotg210_hcd *fotg210, __hc32 token)
364 __u32 v = hc32_to_cpu(fotg210, token);
366 if (v & QTD_STS_ACTIVE)
368 if (v & QTD_STS_HALT)
370 if (!IS_SHORT_READ(v))
372 /* tries to advance through hw_alt_next */
376 static void qh_lines(
377 struct fotg210_hcd *fotg210,
378 struct fotg210_qh *qh,
385 struct fotg210_qtd *td;
387 unsigned size = *sizep;
390 __le32 list_end = FOTG210_LIST_END(fotg210);
391 struct fotg210_qh_hw *hw = qh->hw;
393 if (hw->hw_qtd_next == list_end) /* NEC does this */
396 mark = token_mark(fotg210, hw->hw_token);
397 if (mark == '/') { /* qh_alt_next controls qh advance? */
398 if ((hw->hw_alt_next & QTD_MASK(fotg210))
399 == fotg210->async->hw->hw_alt_next)
400 mark = '#'; /* blocked */
401 else if (hw->hw_alt_next == list_end)
402 mark = '.'; /* use hw_qtd_next */
403 /* else alt_next points to some other qtd */
405 scratch = hc32_to_cpup(fotg210, &hw->hw_info1);
406 hw_curr = (mark == '*') ? hc32_to_cpup(fotg210, &hw->hw_current) : 0;
407 temp = scnprintf(next, size,
408 "qh/%p dev%d %cs ep%d %08x %08x(%08x%c %s nak%d)",
409 qh, scratch & 0x007f,
411 (scratch >> 8) & 0x000f,
412 scratch, hc32_to_cpup(fotg210, &hw->hw_info2),
413 hc32_to_cpup(fotg210, &hw->hw_token), mark,
414 (cpu_to_hc32(fotg210, QTD_TOGGLE) & hw->hw_token)
416 (hc32_to_cpup(fotg210, &hw->hw_alt_next) >> 1) & 0x0f);
420 /* hc may be modifying the list as we read it ... */
421 list_for_each_entry(td, &qh->qtd_list, qtd_list) {
422 scratch = hc32_to_cpup(fotg210, &td->hw_token);
424 if (hw_curr == td->qtd_dma)
426 else if (hw->hw_qtd_next == cpu_to_hc32(fotg210, td->qtd_dma))
428 else if (QTD_LENGTH(scratch)) {
429 if (td->hw_alt_next == fotg210->async->hw->hw_alt_next)
431 else if (td->hw_alt_next != list_end)
434 temp = snprintf(next, size,
435 "\n\t%p%c%s len=%d %08x urb %p",
436 td, mark, ({ char *tmp;
437 switch ((scratch>>8)&0x03) {
451 (scratch >> 16) & 0x7fff,
462 temp = snprintf(next, size, "\n");
473 static ssize_t fill_async_buffer(struct debug_buffer *buf)
476 struct fotg210_hcd *fotg210;
480 struct fotg210_qh *qh;
482 hcd = bus_to_hcd(buf->bus);
483 fotg210 = hcd_to_fotg210(hcd);
484 next = buf->output_buf;
485 size = buf->alloc_size;
489 /* dumps a snapshot of the async schedule.
490 * usually empty except for long-term bulk reads, or head.
491 * one QH per line, and TDs we know about
493 spin_lock_irqsave(&fotg210->lock, flags);
494 for (qh = fotg210->async->qh_next.qh; size > 0 && qh;
496 qh_lines(fotg210, qh, &next, &size);
497 if (fotg210->async_unlink && size > 0) {
498 temp = scnprintf(next, size, "\nunlink =\n");
502 for (qh = fotg210->async_unlink; size > 0 && qh;
503 qh = qh->unlink_next)
504 qh_lines(fotg210, qh, &next, &size);
506 spin_unlock_irqrestore(&fotg210->lock, flags);
508 return strlen(buf->output_buf);
511 #define DBG_SCHED_LIMIT 64
512 static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
515 struct fotg210_hcd *fotg210;
517 union fotg210_shadow p, *seen;
518 unsigned temp, size, seen_count;
523 seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
528 hcd = bus_to_hcd(buf->bus);
529 fotg210 = hcd_to_fotg210(hcd);
530 next = buf->output_buf;
531 size = buf->alloc_size;
533 temp = scnprintf(next, size, "size = %d\n", fotg210->periodic_size);
537 /* dump a snapshot of the periodic schedule.
538 * iso changes, interrupt usually doesn't.
540 spin_lock_irqsave(&fotg210->lock, flags);
541 for (i = 0; i < fotg210->periodic_size; i++) {
542 p = fotg210->pshadow[i];
545 tag = Q_NEXT_TYPE(fotg210, fotg210->periodic[i]);
547 temp = scnprintf(next, size, "%4d: ", i);
552 struct fotg210_qh_hw *hw;
554 switch (hc32_to_cpu(fotg210, tag)) {
557 temp = scnprintf(next, size, " qh%d-%04x/%p",
559 hc32_to_cpup(fotg210,
562 & (QH_CMASK | QH_SMASK),
566 /* don't repeat what follows this qh */
567 for (temp = 0; temp < seen_count; temp++) {
568 if (seen[temp].ptr != p.ptr)
570 if (p.qh->qh_next.ptr) {
571 temp = scnprintf(next, size,
578 /* show more info the first time around */
579 if (temp == seen_count) {
580 u32 scratch = hc32_to_cpup(fotg210,
582 struct fotg210_qtd *qtd;
585 /* count tds, get ep direction */
587 list_for_each_entry(qtd,
591 switch (0x03 & (hc32_to_cpu(
593 qtd->hw_token) >> 8)) {
603 temp = scnprintf(next, size,
608 (scratch >> 8) & 0x000f, type,
609 p.qh->usecs, p.qh->c_usecs,
611 0x7ff & (scratch >> 16));
613 if (seen_count < DBG_SCHED_LIMIT)
614 seen[seen_count++].qh = p.qh;
617 tag = Q_NEXT_TYPE(fotg210, hw->hw_next);
621 temp = scnprintf(next, size,
622 " fstn-%8x/%p", p.fstn->hw_prev,
624 tag = Q_NEXT_TYPE(fotg210, p.fstn->hw_next);
625 p = p.fstn->fstn_next;
628 temp = scnprintf(next, size,
630 tag = Q_NEXT_TYPE(fotg210, p.itd->hw_next);
638 temp = scnprintf(next, size, "\n");
642 spin_unlock_irqrestore(&fotg210->lock, flags);
645 return buf->alloc_size - size;
647 #undef DBG_SCHED_LIMIT
649 static const char *rh_state_string(struct fotg210_hcd *fotg210)
651 switch (fotg210->rh_state) {
652 case FOTG210_RH_HALTED:
654 case FOTG210_RH_SUSPENDED:
656 case FOTG210_RH_RUNNING:
658 case FOTG210_RH_STOPPING:
664 static ssize_t fill_registers_buffer(struct debug_buffer *buf)
667 struct fotg210_hcd *fotg210;
669 unsigned temp, size, i;
670 char *next, scratch[80];
671 static const char fmt[] = "%*s\n";
672 static const char label[] = "";
674 hcd = bus_to_hcd(buf->bus);
675 fotg210 = hcd_to_fotg210(hcd);
676 next = buf->output_buf;
677 size = buf->alloc_size;
679 spin_lock_irqsave(&fotg210->lock, flags);
681 if (!HCD_HW_ACCESSIBLE(hcd)) {
682 size = scnprintf(next, size,
683 "bus %s, device %s\n"
685 "SUSPENDED(no register access)\n",
686 hcd->self.controller->bus->name,
687 dev_name(hcd->self.controller),
692 /* Capability Registers */
693 i = HC_VERSION(fotg210, fotg210_readl(fotg210,
694 &fotg210->caps->hc_capbase));
695 temp = scnprintf(next, size,
696 "bus %s, device %s\n"
698 "EHCI %x.%02x, rh state %s\n",
699 hcd->self.controller->bus->name,
700 dev_name(hcd->self.controller),
702 i >> 8, i & 0x0ff, rh_state_string(fotg210));
706 /* FIXME interpret both types of params */
707 i = fotg210_readl(fotg210, &fotg210->caps->hcs_params);
708 temp = scnprintf(next, size, "structural params 0x%08x\n", i);
712 i = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
713 temp = scnprintf(next, size, "capability params 0x%08x\n", i);
717 /* Operational Registers */
718 temp = dbg_status_buf(scratch, sizeof(scratch), label,
719 fotg210_readl(fotg210, &fotg210->regs->status));
720 temp = scnprintf(next, size, fmt, temp, scratch);
724 temp = dbg_command_buf(scratch, sizeof(scratch), label,
725 fotg210_readl(fotg210, &fotg210->regs->command));
726 temp = scnprintf(next, size, fmt, temp, scratch);
730 temp = dbg_intr_buf(scratch, sizeof(scratch), label,
731 fotg210_readl(fotg210, &fotg210->regs->intr_enable));
732 temp = scnprintf(next, size, fmt, temp, scratch);
736 temp = scnprintf(next, size, "uframe %04x\n",
737 fotg210_read_frame_index(fotg210));
741 if (fotg210->async_unlink) {
742 temp = scnprintf(next, size, "async unlink qh %p\n",
743 fotg210->async_unlink);
749 temp = scnprintf(next, size,
750 "irq normal %ld err %ld iaa %ld(lost %ld)\n",
751 fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa,
752 fotg210->stats.lost_iaa);
756 temp = scnprintf(next, size, "complete %ld unlink %ld\n",
757 fotg210->stats.complete, fotg210->stats.unlink);
763 spin_unlock_irqrestore(&fotg210->lock, flags);
765 return buf->alloc_size - size;
768 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
769 ssize_t (*fill_func)(struct debug_buffer *))
771 struct debug_buffer *buf;
773 buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
777 buf->fill_func = fill_func;
778 mutex_init(&buf->mutex);
779 buf->alloc_size = PAGE_SIZE;
785 static int fill_buffer(struct debug_buffer *buf)
789 if (!buf->output_buf)
790 buf->output_buf = vmalloc(buf->alloc_size);
792 if (!buf->output_buf) {
797 ret = buf->fill_func(buf);
808 static ssize_t debug_output(struct file *file, char __user *user_buf,
809 size_t len, loff_t *offset)
811 struct debug_buffer *buf = file->private_data;
814 mutex_lock(&buf->mutex);
815 if (buf->count == 0) {
816 ret = fill_buffer(buf);
818 mutex_unlock(&buf->mutex);
822 mutex_unlock(&buf->mutex);
824 ret = simple_read_from_buffer(user_buf, len, offset,
825 buf->output_buf, buf->count);
832 static int debug_close(struct inode *inode, struct file *file)
834 struct debug_buffer *buf = file->private_data;
837 vfree(buf->output_buf);
843 static int debug_async_open(struct inode *inode, struct file *file)
845 file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
847 return file->private_data ? 0 : -ENOMEM;
850 static int debug_periodic_open(struct inode *inode, struct file *file)
852 struct debug_buffer *buf;
853 buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
857 buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
858 file->private_data = buf;
862 static int debug_registers_open(struct inode *inode, struct file *file)
864 file->private_data = alloc_buffer(inode->i_private,
865 fill_registers_buffer);
867 return file->private_data ? 0 : -ENOMEM;
870 static inline void create_debug_files(struct fotg210_hcd *fotg210)
872 struct usb_bus *bus = &fotg210_to_hcd(fotg210)->self;
874 fotg210->debug_dir = debugfs_create_dir(bus->bus_name,
876 if (!fotg210->debug_dir)
879 if (!debugfs_create_file("async", S_IRUGO, fotg210->debug_dir, bus,
883 if (!debugfs_create_file("periodic", S_IRUGO, fotg210->debug_dir, bus,
884 &debug_periodic_fops))
887 if (!debugfs_create_file("registers", S_IRUGO, fotg210->debug_dir, bus,
888 &debug_registers_fops))
894 debugfs_remove_recursive(fotg210->debug_dir);
897 static inline void remove_debug_files(struct fotg210_hcd *fotg210)
899 debugfs_remove_recursive(fotg210->debug_dir);
902 /*-------------------------------------------------------------------------*/
905 * handshake - spin reading hc until handshake completes or fails
906 * @ptr: address of hc register to be read
907 * @mask: bits to look at in result of read
908 * @done: value of those bits when handshake succeeds
909 * @usec: timeout in microseconds
911 * Returns negative errno, or zero on success
913 * Success happens when the "mask" bits have the specified value (hardware
914 * handshake done). There are two failure modes: "usec" have passed (major
915 * hardware flakeout), or the register reads as all-ones (hardware removed).
917 * That last failure should_only happen in cases like physical cardbus eject
918 * before driver shutdown. But it also seems to be caused by bugs in cardbus
919 * bridge shutdown: shutting down the bridge before the devices using it.
921 static int handshake(struct fotg210_hcd *fotg210, void __iomem *ptr,
922 u32 mask, u32 done, int usec)
927 result = fotg210_readl(fotg210, ptr);
928 if (result == ~(u32)0) /* card removed */
940 * Force HC to halt state from unknown (EHCI spec section 2.3).
941 * Must be called with interrupts enabled and the lock not held.
943 static int fotg210_halt(struct fotg210_hcd *fotg210)
947 spin_lock_irq(&fotg210->lock);
949 /* disable any irqs left enabled by previous code */
950 fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
953 * This routine gets called during probe before fotg210->command
954 * has been initialized, so we can't rely on its value.
956 fotg210->command &= ~CMD_RUN;
957 temp = fotg210_readl(fotg210, &fotg210->regs->command);
958 temp &= ~(CMD_RUN | CMD_IAAD);
959 fotg210_writel(fotg210, temp, &fotg210->regs->command);
961 spin_unlock_irq(&fotg210->lock);
962 synchronize_irq(fotg210_to_hcd(fotg210)->irq);
964 return handshake(fotg210, &fotg210->regs->status,
965 STS_HALT, STS_HALT, 16 * 125);
969 * Reset a non-running (STS_HALT == 1) controller.
970 * Must be called with interrupts enabled and the lock not held.
972 static int fotg210_reset(struct fotg210_hcd *fotg210)
975 u32 command = fotg210_readl(fotg210, &fotg210->regs->command);
977 /* If the EHCI debug controller is active, special care must be
978 * taken before and after a host controller reset */
979 if (fotg210->debug && !dbgp_reset_prep(fotg210_to_hcd(fotg210)))
980 fotg210->debug = NULL;
982 command |= CMD_RESET;
983 dbg_cmd(fotg210, "reset", command);
984 fotg210_writel(fotg210, command, &fotg210->regs->command);
985 fotg210->rh_state = FOTG210_RH_HALTED;
986 fotg210->next_statechange = jiffies;
987 retval = handshake(fotg210, &fotg210->regs->command,
988 CMD_RESET, 0, 250 * 1000);
994 dbgp_external_startup(fotg210_to_hcd(fotg210));
996 fotg210->port_c_suspend = fotg210->suspended_ports =
997 fotg210->resuming_ports = 0;
1002 * Idle the controller (turn off the schedules).
1003 * Must be called with interrupts enabled and the lock not held.
1005 static void fotg210_quiesce(struct fotg210_hcd *fotg210)
1009 if (fotg210->rh_state != FOTG210_RH_RUNNING)
1012 /* wait for any schedule enables/disables to take effect */
1013 temp = (fotg210->command << 10) & (STS_ASS | STS_PSS);
1014 handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, temp,
1017 /* then disable anything that's still active */
1018 spin_lock_irq(&fotg210->lock);
1019 fotg210->command &= ~(CMD_ASE | CMD_PSE);
1020 fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
1021 spin_unlock_irq(&fotg210->lock);
1023 /* hardware can take 16 microframes to turn off ... */
1024 handshake(fotg210, &fotg210->regs->status, STS_ASS | STS_PSS, 0,
1028 /*-------------------------------------------------------------------------*/
1030 static void end_unlink_async(struct fotg210_hcd *fotg210);
1031 static void unlink_empty_async(struct fotg210_hcd *fotg210);
1032 static void fotg210_work(struct fotg210_hcd *fotg210);
1033 static void start_unlink_intr(struct fotg210_hcd *fotg210,
1034 struct fotg210_qh *qh);
1035 static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
1037 /*-------------------------------------------------------------------------*/
1039 /* Set a bit in the USBCMD register */
1040 static void fotg210_set_command_bit(struct fotg210_hcd *fotg210, u32 bit)
1042 fotg210->command |= bit;
1043 fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
1045 /* unblock posted write */
1046 fotg210_readl(fotg210, &fotg210->regs->command);
1049 /* Clear a bit in the USBCMD register */
1050 static void fotg210_clear_command_bit(struct fotg210_hcd *fotg210, u32 bit)
1052 fotg210->command &= ~bit;
1053 fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
1055 /* unblock posted write */
1056 fotg210_readl(fotg210, &fotg210->regs->command);
1059 /*-------------------------------------------------------------------------*/
1062 * EHCI timer support... Now using hrtimers.
1064 * Lots of different events are triggered from fotg210->hrtimer. Whenever
1065 * the timer routine runs, it checks each possible event; events that are
1066 * currently enabled and whose expiration time has passed get handled.
1067 * The set of enabled events is stored as a collection of bitflags in
1068 * fotg210->enabled_hrtimer_events, and they are numbered in order of
1069 * increasing delay values (ranging between 1 ms and 100 ms).
1071 * Rather than implementing a sorted list or tree of all pending events,
1072 * we keep track only of the lowest-numbered pending event, in
1073 * fotg210->next_hrtimer_event. Whenever fotg210->hrtimer gets restarted, its
1074 * expiration time is set to the timeout value for this event.
1076 * As a result, events might not get handled right away; the actual delay
1077 * could be anywhere up to twice the requested delay. This doesn't
1078 * matter, because none of the events are especially time-critical. The
1079 * ones that matter most all have a delay of 1 ms, so they will be
1080 * handled after 2 ms at most, which is okay. In addition to this, we
1081 * allow for an expiration range of 1 ms.
1085 * Delay lengths for the hrtimer event types.
1086 * Keep this list sorted by delay length, in the same order as
1087 * the event types indexed by enum fotg210_hrtimer_event in fotg210.h.
1089 static unsigned event_delays_ns[] = {
1090 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_ASS */
1091 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_PSS */
1092 1 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_POLL_DEAD */
1093 1125 * NSEC_PER_USEC, /* FOTG210_HRTIMER_UNLINK_INTR */
1094 2 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_FREE_ITDS */
1095 6 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_ASYNC_UNLINKS */
1096 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IAA_WATCHDOG */
1097 10 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_PERIODIC */
1098 15 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_DISABLE_ASYNC */
1099 100 * NSEC_PER_MSEC, /* FOTG210_HRTIMER_IO_WATCHDOG */
1102 /* Enable a pending hrtimer event */
1103 static void fotg210_enable_event(struct fotg210_hcd *fotg210, unsigned event,
1106 ktime_t *timeout = &fotg210->hr_timeouts[event];
1109 *timeout = ktime_add(ktime_get(),
1110 ktime_set(0, event_delays_ns[event]));
1111 fotg210->enabled_hrtimer_events |= (1 << event);
1113 /* Track only the lowest-numbered pending event */
1114 if (event < fotg210->next_hrtimer_event) {
1115 fotg210->next_hrtimer_event = event;
1116 hrtimer_start_range_ns(&fotg210->hrtimer, *timeout,
1117 NSEC_PER_MSEC, HRTIMER_MODE_ABS);
1122 /* Poll the STS_ASS status bit; see when it agrees with CMD_ASE */
1123 static void fotg210_poll_ASS(struct fotg210_hcd *fotg210)
1125 unsigned actual, want;
1127 /* Don't enable anything if the controller isn't running (e.g., died) */
1128 if (fotg210->rh_state != FOTG210_RH_RUNNING)
1131 want = (fotg210->command & CMD_ASE) ? STS_ASS : 0;
1132 actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_ASS;
1134 if (want != actual) {
1136 /* Poll again later, but give up after about 20 ms */
1137 if (fotg210->ASS_poll_count++ < 20) {
1138 fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_ASS,
1142 fotg210_dbg(fotg210, "Waited too long for the async schedule status (%x/%x), giving up\n",
1145 fotg210->ASS_poll_count = 0;
1147 /* The status is up-to-date; restart or stop the schedule as needed */
1148 if (want == 0) { /* Stopped */
1149 if (fotg210->async_count > 0)
1150 fotg210_set_command_bit(fotg210, CMD_ASE);
1152 } else { /* Running */
1153 if (fotg210->async_count == 0) {
1155 /* Turn off the schedule after a while */
1156 fotg210_enable_event(fotg210,
1157 FOTG210_HRTIMER_DISABLE_ASYNC,
1163 /* Turn off the async schedule after a brief delay */
1164 static void fotg210_disable_ASE(struct fotg210_hcd *fotg210)
1166 fotg210_clear_command_bit(fotg210, CMD_ASE);
1170 /* Poll the STS_PSS status bit; see when it agrees with CMD_PSE */
1171 static void fotg210_poll_PSS(struct fotg210_hcd *fotg210)
1173 unsigned actual, want;
1175 /* Don't do anything if the controller isn't running (e.g., died) */
1176 if (fotg210->rh_state != FOTG210_RH_RUNNING)
1179 want = (fotg210->command & CMD_PSE) ? STS_PSS : 0;
1180 actual = fotg210_readl(fotg210, &fotg210->regs->status) & STS_PSS;
1182 if (want != actual) {
1184 /* Poll again later, but give up after about 20 ms */
1185 if (fotg210->PSS_poll_count++ < 20) {
1186 fotg210_enable_event(fotg210, FOTG210_HRTIMER_POLL_PSS,
1190 fotg210_dbg(fotg210, "Waited too long for the periodic schedule status (%x/%x), giving up\n",
1193 fotg210->PSS_poll_count = 0;
1195 /* The status is up-to-date; restart or stop the schedule as needed */
1196 if (want == 0) { /* Stopped */
1197 if (fotg210->periodic_count > 0)
1198 fotg210_set_command_bit(fotg210, CMD_PSE);
1200 } else { /* Running */
1201 if (fotg210->periodic_count == 0) {
1203 /* Turn off the schedule after a while */
1204 fotg210_enable_event(fotg210,
1205 FOTG210_HRTIMER_DISABLE_PERIODIC,
1211 /* Turn off the periodic schedule after a brief delay */
1212 static void fotg210_disable_PSE(struct fotg210_hcd *fotg210)
1214 fotg210_clear_command_bit(fotg210, CMD_PSE);
1218 /* Poll the STS_HALT status bit; see when a dead controller stops */
1219 static void fotg210_handle_controller_death(struct fotg210_hcd *fotg210)
1221 if (!(fotg210_readl(fotg210, &fotg210->regs->status) & STS_HALT)) {
1223 /* Give up after a few milliseconds */
1224 if (fotg210->died_poll_count++ < 5) {
1225 /* Try again later */
1226 fotg210_enable_event(fotg210,
1227 FOTG210_HRTIMER_POLL_DEAD, true);
1230 fotg210_warn(fotg210, "Waited too long for the controller to stop, giving up\n");
1233 /* Clean up the mess */
1234 fotg210->rh_state = FOTG210_RH_HALTED;
1235 fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
1236 fotg210_work(fotg210);
1237 end_unlink_async(fotg210);
1239 /* Not in process context, so don't try to reset the controller */
1243 /* Handle unlinked interrupt QHs once they are gone from the hardware */
1244 static void fotg210_handle_intr_unlinks(struct fotg210_hcd *fotg210)
1246 bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);
1249 * Process all the QHs on the intr_unlink list that were added
1250 * before the current unlink cycle began. The list is in
1251 * temporal order, so stop when we reach the first entry in the
1252 * current cycle. But if the root hub isn't running then
1253 * process all the QHs on the list.
1255 fotg210->intr_unlinking = true;
1256 while (fotg210->intr_unlink) {
1257 struct fotg210_qh *qh = fotg210->intr_unlink;
1259 if (!stopped && qh->unlink_cycle == fotg210->intr_unlink_cycle)
1261 fotg210->intr_unlink = qh->unlink_next;
1262 qh->unlink_next = NULL;
1263 end_unlink_intr(fotg210, qh);
1266 /* Handle remaining entries later */
1267 if (fotg210->intr_unlink) {
1268 fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
1270 ++fotg210->intr_unlink_cycle;
1272 fotg210->intr_unlinking = false;
1276 /* Start another free-iTDs/siTDs cycle */
1277 static void start_free_itds(struct fotg210_hcd *fotg210)
1279 if (!(fotg210->enabled_hrtimer_events &
1280 BIT(FOTG210_HRTIMER_FREE_ITDS))) {
1281 fotg210->last_itd_to_free = list_entry(
1282 fotg210->cached_itd_list.prev,
1283 struct fotg210_itd, itd_list);
1284 fotg210_enable_event(fotg210, FOTG210_HRTIMER_FREE_ITDS, true);
1288 /* Wait for controller to stop using old iTDs and siTDs */
1289 static void end_free_itds(struct fotg210_hcd *fotg210)
1291 struct fotg210_itd *itd, *n;
1293 if (fotg210->rh_state < FOTG210_RH_RUNNING)
1294 fotg210->last_itd_to_free = NULL;
1296 list_for_each_entry_safe(itd, n, &fotg210->cached_itd_list, itd_list) {
1297 list_del(&itd->itd_list);
1298 dma_pool_free(fotg210->itd_pool, itd, itd->itd_dma);
1299 if (itd == fotg210->last_itd_to_free)
1303 if (!list_empty(&fotg210->cached_itd_list))
1304 start_free_itds(fotg210);
1308 /* Handle lost (or very late) IAA interrupts */
1309 static void fotg210_iaa_watchdog(struct fotg210_hcd *fotg210)
1311 if (fotg210->rh_state != FOTG210_RH_RUNNING)
1315 * Lost IAA irqs wedge things badly; seen first with a vt8235.
1316 * So we need this watchdog, but must protect it against both
1317 * (a) SMP races against real IAA firing and retriggering, and
1318 * (b) clean HC shutdown, when IAA watchdog was pending.
1320 if (fotg210->async_iaa) {
1323 /* If we get here, IAA is *REALLY* late. It's barely
1324 * conceivable that the system is so busy that CMD_IAAD
1325 * is still legitimately set, so let's be sure it's
1326 * clear before we read STS_IAA. (The HC should clear
1327 * CMD_IAAD when it sets STS_IAA.)
1329 cmd = fotg210_readl(fotg210, &fotg210->regs->command);
1332 * If IAA is set here it either legitimately triggered
1333 * after the watchdog timer expired (_way_ late, so we'll
1334 * still count it as lost) ... or a silicon erratum:
1335 * - VIA seems to set IAA without triggering the IRQ;
1336 * - IAAD potentially cleared without setting IAA.
1338 status = fotg210_readl(fotg210, &fotg210->regs->status);
1339 if ((status & STS_IAA) || !(cmd & CMD_IAAD)) {
1340 COUNT(fotg210->stats.lost_iaa);
1341 fotg210_writel(fotg210, STS_IAA,
1342 &fotg210->regs->status);
1345 fotg210_dbg(fotg210, "IAA watchdog: status %x cmd %x\n",
1347 end_unlink_async(fotg210);
1352 /* Enable the I/O watchdog, if appropriate */
1353 static void turn_on_io_watchdog(struct fotg210_hcd *fotg210)
1355 /* Not needed if the controller isn't running or it's already enabled */
1356 if (fotg210->rh_state != FOTG210_RH_RUNNING ||
1357 (fotg210->enabled_hrtimer_events &
1358 BIT(FOTG210_HRTIMER_IO_WATCHDOG)))
1362 * Isochronous transfers always need the watchdog.
1363 * For other sorts we use it only if the flag is set.
1365 if (fotg210->isoc_count > 0 || (fotg210->need_io_watchdog &&
1366 fotg210->async_count + fotg210->intr_count > 0))
1367 fotg210_enable_event(fotg210, FOTG210_HRTIMER_IO_WATCHDOG,
1373 * Handler functions for the hrtimer event types.
1374 * Keep this array in the same order as the event types indexed by
1375 * enum fotg210_hrtimer_event in fotg210.h.
1377 static void (*event_handlers[])(struct fotg210_hcd *) = {
1378 fotg210_poll_ASS, /* FOTG210_HRTIMER_POLL_ASS */
1379 fotg210_poll_PSS, /* FOTG210_HRTIMER_POLL_PSS */
1380 fotg210_handle_controller_death, /* FOTG210_HRTIMER_POLL_DEAD */
1381 fotg210_handle_intr_unlinks, /* FOTG210_HRTIMER_UNLINK_INTR */
1382 end_free_itds, /* FOTG210_HRTIMER_FREE_ITDS */
1383 unlink_empty_async, /* FOTG210_HRTIMER_ASYNC_UNLINKS */
1384 fotg210_iaa_watchdog, /* FOTG210_HRTIMER_IAA_WATCHDOG */
1385 fotg210_disable_PSE, /* FOTG210_HRTIMER_DISABLE_PERIODIC */
1386 fotg210_disable_ASE, /* FOTG210_HRTIMER_DISABLE_ASYNC */
1387 fotg210_work, /* FOTG210_HRTIMER_IO_WATCHDOG */
1390 static enum hrtimer_restart fotg210_hrtimer_func(struct hrtimer *t)
1392 struct fotg210_hcd *fotg210 =
1393 container_of(t, struct fotg210_hcd, hrtimer);
1395 unsigned long events;
1396 unsigned long flags;
1399 spin_lock_irqsave(&fotg210->lock, flags);
1401 events = fotg210->enabled_hrtimer_events;
1402 fotg210->enabled_hrtimer_events = 0;
1403 fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;
1406 * Check each pending event. If its time has expired, handle
1407 * the event; otherwise re-enable it.
1410 for_each_set_bit(e, &events, FOTG210_HRTIMER_NUM_EVENTS) {
1411 if (now.tv64 >= fotg210->hr_timeouts[e].tv64)
1412 event_handlers[e](fotg210);
1414 fotg210_enable_event(fotg210, e, false);
1417 spin_unlock_irqrestore(&fotg210->lock, flags);
1418 return HRTIMER_NORESTART;
1421 /*-------------------------------------------------------------------------*/
1423 #define fotg210_bus_suspend NULL
1424 #define fotg210_bus_resume NULL
1426 /*-------------------------------------------------------------------------*/
1428 static int check_reset_complete(
1429 struct fotg210_hcd *fotg210,
1431 u32 __iomem *status_reg,
1434 if (!(port_status & PORT_CONNECT))
1437 /* if reset finished and it's still not enabled -- handoff */
1438 if (!(port_status & PORT_PE)) {
1439 /* with integrated TT, there's nobody to hand it to! */
1440 fotg210_dbg(fotg210,
1441 "Failed to enable port %d on root hub TT\n",
1445 fotg210_dbg(fotg210, "port %d reset complete, port enabled\n",
1452 /*-------------------------------------------------------------------------*/
1455 /* build "status change" packet (one or two bytes) from HC registers */
1458 fotg210_hub_status_data(struct usb_hcd *hcd, char *buf)
1460 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
1464 unsigned long flags;
1466 /* init status to no-changes */
1469 /* Inform the core about resumes-in-progress by returning
1470 * a non-zero value even if there are no status changes.
1472 status = fotg210->resuming_ports;
1474 mask = PORT_CSC | PORT_PEC;
1475 /* PORT_RESUME from hardware ~= PORT_STAT_C_SUSPEND */
1477 /* no hub change reports (bit 0) for now (power, ...) */
1479 /* port N changes (bit N)? */
1480 spin_lock_irqsave(&fotg210->lock, flags);
1482 temp = fotg210_readl(fotg210, &fotg210->regs->port_status);
1485 * Return status information even for ports with OWNER set.
1486 * Otherwise hub_wq wouldn't see the disconnect event when a
1487 * high-speed device is switched over to the companion
1488 * controller by the user.
1491 if ((temp & mask) != 0 || test_bit(0, &fotg210->port_c_suspend)
1492 || (fotg210->reset_done[0] && time_after_eq(
1493 jiffies, fotg210->reset_done[0]))) {
1497 /* FIXME autosuspend idle root hubs */
1498 spin_unlock_irqrestore(&fotg210->lock, flags);
1499 return status ? retval : 0;
1502 /*-------------------------------------------------------------------------*/
1505 fotg210_hub_descriptor(
1506 struct fotg210_hcd *fotg210,
1507 struct usb_hub_descriptor *desc
1509 int ports = HCS_N_PORTS(fotg210->hcs_params);
1512 desc->bDescriptorType = USB_DT_HUB;
1513 desc->bPwrOn2PwrGood = 10; /* fotg210 1.0, 2.3.9 says 20ms max */
1514 desc->bHubContrCurrent = 0;
1516 desc->bNbrPorts = ports;
1517 temp = 1 + (ports / 8);
1518 desc->bDescLength = 7 + 2 * temp;
1520 /* two bitmaps: ports removable, and usb 1.0 legacy PortPwrCtrlMask */
1521 memset(&desc->u.hs.DeviceRemovable[0], 0, temp);
1522 memset(&desc->u.hs.DeviceRemovable[temp], 0xff, temp);
1524 temp = HUB_CHAR_INDV_PORT_OCPM; /* per-port overcurrent reporting */
1525 temp |= HUB_CHAR_NO_LPSM; /* no power switching */
1526 desc->wHubCharacteristics = cpu_to_le16(temp);
1529 /*-------------------------------------------------------------------------*/
1531 static int fotg210_hub_control(
1532 struct usb_hcd *hcd,
1539 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
1540 int ports = HCS_N_PORTS(fotg210->hcs_params);
1541 u32 __iomem *status_reg = &fotg210->regs->port_status;
1542 u32 temp, temp1, status;
1543 unsigned long flags;
1548 * FIXME: support SetPortFeatures USB_PORT_FEAT_INDICATOR.
1549 * HCS_INDICATOR may say we can change LEDs to off/amber/green.
1550 * (track current state ourselves) ... blink for diagnostics,
1551 * power, "this is the one", etc. EHCI spec supports this.
1554 spin_lock_irqsave(&fotg210->lock, flags);
1556 case ClearHubFeature:
1558 case C_HUB_LOCAL_POWER:
1559 case C_HUB_OVER_CURRENT:
1560 /* no hub-wide feature/status flags */
1566 case ClearPortFeature:
1567 if (!wIndex || wIndex > ports)
1570 temp = fotg210_readl(fotg210, status_reg);
1571 temp &= ~PORT_RWC_BITS;
1574 * Even if OWNER is set, so the port is owned by the
1575 * companion controller, hub_wq needs to be able to clear
1576 * the port-change status bits (especially
1577 * USB_PORT_STAT_C_CONNECTION).
1581 case USB_PORT_FEAT_ENABLE:
1582 fotg210_writel(fotg210, temp & ~PORT_PE, status_reg);
1584 case USB_PORT_FEAT_C_ENABLE:
1585 fotg210_writel(fotg210, temp | PORT_PEC, status_reg);
1587 case USB_PORT_FEAT_SUSPEND:
1588 if (temp & PORT_RESET)
1590 if (!(temp & PORT_SUSPEND))
1592 if ((temp & PORT_PE) == 0)
1595 /* resume signaling for 20 msec */
1596 fotg210_writel(fotg210, temp | PORT_RESUME, status_reg);
1597 fotg210->reset_done[wIndex] = jiffies
1598 + msecs_to_jiffies(USB_RESUME_TIMEOUT);
1600 case USB_PORT_FEAT_C_SUSPEND:
1601 clear_bit(wIndex, &fotg210->port_c_suspend);
1603 case USB_PORT_FEAT_C_CONNECTION:
1604 fotg210_writel(fotg210, temp | PORT_CSC, status_reg);
1606 case USB_PORT_FEAT_C_OVER_CURRENT:
1607 fotg210_writel(fotg210, temp | OTGISR_OVC,
1608 &fotg210->regs->otgisr);
1610 case USB_PORT_FEAT_C_RESET:
1611 /* GetPortStatus clears reset */
1616 fotg210_readl(fotg210, &fotg210->regs->command);
1618 case GetHubDescriptor:
1619 fotg210_hub_descriptor(fotg210, (struct usb_hub_descriptor *)
1623 /* no hub-wide feature/status flags */
1625 /*cpu_to_le32s ((u32 *) buf); */
1628 if (!wIndex || wIndex > ports)
1632 temp = fotg210_readl(fotg210, status_reg);
1634 /* wPortChange bits */
1635 if (temp & PORT_CSC)
1636 status |= USB_PORT_STAT_C_CONNECTION << 16;
1637 if (temp & PORT_PEC)
1638 status |= USB_PORT_STAT_C_ENABLE << 16;
1640 temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
1641 if (temp1 & OTGISR_OVC)
1642 status |= USB_PORT_STAT_C_OVERCURRENT << 16;
1644 /* whoever resumes must GetPortStatus to complete it!! */
1645 if (temp & PORT_RESUME) {
1647 /* Remote Wakeup received? */
1648 if (!fotg210->reset_done[wIndex]) {
1649 /* resume signaling for 20 msec */
1650 fotg210->reset_done[wIndex] = jiffies
1651 + msecs_to_jiffies(20);
1652 /* check the port again */
1653 mod_timer(&fotg210_to_hcd(fotg210)->rh_timer,
1654 fotg210->reset_done[wIndex]);
1657 /* resume completed? */
1658 else if (time_after_eq(jiffies,
1659 fotg210->reset_done[wIndex])) {
1660 clear_bit(wIndex, &fotg210->suspended_ports);
1661 set_bit(wIndex, &fotg210->port_c_suspend);
1662 fotg210->reset_done[wIndex] = 0;
1664 /* stop resume signaling */
1665 temp = fotg210_readl(fotg210, status_reg);
1666 fotg210_writel(fotg210,
1667 temp & ~(PORT_RWC_BITS | PORT_RESUME),
1669 clear_bit(wIndex, &fotg210->resuming_ports);
1670 retval = handshake(fotg210, status_reg,
1671 PORT_RESUME, 0, 2000 /* 2msec */);
1673 fotg210_err(fotg210,
1674 "port %d resume error %d\n",
1675 wIndex + 1, retval);
1678 temp &= ~(PORT_SUSPEND|PORT_RESUME|(3<<10));
1682 /* whoever resets must GetPortStatus to complete it!! */
1683 if ((temp & PORT_RESET)
1684 && time_after_eq(jiffies,
1685 fotg210->reset_done[wIndex])) {
1686 status |= USB_PORT_STAT_C_RESET << 16;
1687 fotg210->reset_done[wIndex] = 0;
1688 clear_bit(wIndex, &fotg210->resuming_ports);
1690 /* force reset to complete */
1691 fotg210_writel(fotg210,
1692 temp & ~(PORT_RWC_BITS | PORT_RESET),
1694 /* REVISIT: some hardware needs 550+ usec to clear
1695 * this bit; seems too long to spin routinely...
1697 retval = handshake(fotg210, status_reg,
1698 PORT_RESET, 0, 1000);
1700 fotg210_err(fotg210, "port %d reset error %d\n",
1701 wIndex + 1, retval);
1705 /* see what we found out */
1706 temp = check_reset_complete(fotg210, wIndex, status_reg,
1707 fotg210_readl(fotg210, status_reg));
1710 if (!(temp & (PORT_RESUME|PORT_RESET))) {
1711 fotg210->reset_done[wIndex] = 0;
1712 clear_bit(wIndex, &fotg210->resuming_ports);
1715 /* transfer dedicated ports to the companion hc */
1716 if ((temp & PORT_CONNECT) &&
1717 test_bit(wIndex, &fotg210->companion_ports)) {
1718 temp &= ~PORT_RWC_BITS;
1719 fotg210_writel(fotg210, temp, status_reg);
1720 fotg210_dbg(fotg210, "port %d --> companion\n",
1722 temp = fotg210_readl(fotg210, status_reg);
1726 * Even if OWNER is set, there's no harm letting hub_wq
1727 * see the wPortStatus values (they should all be 0 except
1728 * for PORT_POWER anyway).
1731 if (temp & PORT_CONNECT) {
1732 status |= USB_PORT_STAT_CONNECTION;
1733 status |= fotg210_port_speed(fotg210, temp);
1736 status |= USB_PORT_STAT_ENABLE;
1738 /* maybe the port was unsuspended without our knowledge */
1739 if (temp & (PORT_SUSPEND|PORT_RESUME)) {
1740 status |= USB_PORT_STAT_SUSPEND;
1741 } else if (test_bit(wIndex, &fotg210->suspended_ports)) {
1742 clear_bit(wIndex, &fotg210->suspended_ports);
1743 clear_bit(wIndex, &fotg210->resuming_ports);
1744 fotg210->reset_done[wIndex] = 0;
1746 set_bit(wIndex, &fotg210->port_c_suspend);
1749 temp1 = fotg210_readl(fotg210, &fotg210->regs->otgisr);
1750 if (temp1 & OTGISR_OVC)
1751 status |= USB_PORT_STAT_OVERCURRENT;
1752 if (temp & PORT_RESET)
1753 status |= USB_PORT_STAT_RESET;
1754 if (test_bit(wIndex, &fotg210->port_c_suspend))
1755 status |= USB_PORT_STAT_C_SUSPEND << 16;
1757 if (status & ~0xffff) /* only if wPortChange is interesting */
1758 dbg_port(fotg210, "GetStatus", wIndex + 1, temp);
1759 put_unaligned_le32(status, buf);
1763 case C_HUB_LOCAL_POWER:
1764 case C_HUB_OVER_CURRENT:
1765 /* no hub-wide feature/status flags */
1771 case SetPortFeature:
1772 selector = wIndex >> 8;
1775 if (!wIndex || wIndex > ports)
1778 temp = fotg210_readl(fotg210, status_reg);
1779 temp &= ~PORT_RWC_BITS;
1781 case USB_PORT_FEAT_SUSPEND:
1782 if ((temp & PORT_PE) == 0
1783 || (temp & PORT_RESET) != 0)
1786 /* After above check the port must be connected.
1787 * Set appropriate bit thus could put phy into low power
1788 * mode if we have hostpc feature
1790 fotg210_writel(fotg210, temp | PORT_SUSPEND,
1792 set_bit(wIndex, &fotg210->suspended_ports);
1794 case USB_PORT_FEAT_RESET:
1795 if (temp & PORT_RESUME)
1797 /* line status bits may report this as low speed,
1798 * which can be fine if this root hub has a
1799 * transaction translator built in.
1801 fotg210_dbg(fotg210, "port %d reset\n", wIndex + 1);
1806 * caller must wait, then call GetPortStatus
1807 * usb 2.0 spec says 50 ms resets on root
1809 fotg210->reset_done[wIndex] = jiffies
1810 + msecs_to_jiffies(50);
1811 fotg210_writel(fotg210, temp, status_reg);
1814 /* For downstream facing ports (these): one hub port is put
1815 * into test mode according to USB2 11.24.2.13, then the hub
1816 * must be reset (which for root hub now means rmmod+modprobe,
1817 * or else system reboot). See EHCI 2.3.9 and 4.14 for info
1818 * about the EHCI-specific stuff.
1820 case USB_PORT_FEAT_TEST:
1821 if (!selector || selector > 5)
1823 spin_unlock_irqrestore(&fotg210->lock, flags);
1824 fotg210_quiesce(fotg210);
1825 spin_lock_irqsave(&fotg210->lock, flags);
1827 /* Put all enabled ports into suspend */
1828 temp = fotg210_readl(fotg210, status_reg) &
1831 fotg210_writel(fotg210, temp | PORT_SUSPEND,
1834 spin_unlock_irqrestore(&fotg210->lock, flags);
1835 fotg210_halt(fotg210);
1836 spin_lock_irqsave(&fotg210->lock, flags);
1838 temp = fotg210_readl(fotg210, status_reg);
1839 temp |= selector << 16;
1840 fotg210_writel(fotg210, temp, status_reg);
1846 fotg210_readl(fotg210, &fotg210->regs->command);
1851 /* "stall" on error */
1854 spin_unlock_irqrestore(&fotg210->lock, flags);
1858 static void __maybe_unused fotg210_relinquish_port(struct usb_hcd *hcd,
1864 static int __maybe_unused fotg210_port_handed_over(struct usb_hcd *hcd,
1869 /*-------------------------------------------------------------------------*/
1871 * There's basically three types of memory:
1872 * - data used only by the HCD ... kmalloc is fine
1873 * - async and periodic schedules, shared by HC and HCD ... these
1874 * need to use dma_pool or dma_alloc_coherent
1875 * - driver buffers, read/written by HC ... single shot DMA mapped
1877 * There's also "register" data (e.g. PCI or SOC), which is memory mapped.
1878 * No memory seen by this driver is pageable.
1881 /*-------------------------------------------------------------------------*/
1883 /* Allocate the key transfer structures from the previously allocated pool */
1885 static inline void fotg210_qtd_init(struct fotg210_hcd *fotg210,
1886 struct fotg210_qtd *qtd, dma_addr_t dma)
1888 memset(qtd, 0, sizeof(*qtd));
1890 qtd->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
1891 qtd->hw_next = FOTG210_LIST_END(fotg210);
1892 qtd->hw_alt_next = FOTG210_LIST_END(fotg210);
1893 INIT_LIST_HEAD(&qtd->qtd_list);
1896 static struct fotg210_qtd *fotg210_qtd_alloc(struct fotg210_hcd *fotg210,
1899 struct fotg210_qtd *qtd;
1902 qtd = dma_pool_alloc(fotg210->qtd_pool, flags, &dma);
1904 fotg210_qtd_init(fotg210, qtd, dma);
1909 static inline void fotg210_qtd_free(struct fotg210_hcd *fotg210,
1910 struct fotg210_qtd *qtd)
1912 dma_pool_free(fotg210->qtd_pool, qtd, qtd->qtd_dma);
1916 static void qh_destroy(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
1918 /* clean qtds first, and know this is not linked */
1919 if (!list_empty(&qh->qtd_list) || qh->qh_next.ptr) {
1920 fotg210_dbg(fotg210, "unused qh not empty!\n");
1924 fotg210_qtd_free(fotg210, qh->dummy);
1925 dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
1929 static struct fotg210_qh *fotg210_qh_alloc(struct fotg210_hcd *fotg210,
1932 struct fotg210_qh *qh;
1935 qh = kzalloc(sizeof(*qh), GFP_ATOMIC);
1938 qh->hw = (struct fotg210_qh_hw *)
1939 dma_pool_alloc(fotg210->qh_pool, flags, &dma);
1942 memset(qh->hw, 0, sizeof(*qh->hw));
1944 INIT_LIST_HEAD(&qh->qtd_list);
1946 /* dummy td enables safe urb queuing */
1947 qh->dummy = fotg210_qtd_alloc(fotg210, flags);
1948 if (qh->dummy == NULL) {
1949 fotg210_dbg(fotg210, "no dummy td\n");
1955 dma_pool_free(fotg210->qh_pool, qh->hw, qh->qh_dma);
1961 /*-------------------------------------------------------------------------*/
1963 /* The queue heads and transfer descriptors are managed from pools tied
1964 * to each of the "per device" structures.
1965 * This is the initialisation and cleanup code.
1968 static void fotg210_mem_cleanup(struct fotg210_hcd *fotg210)
1971 qh_destroy(fotg210, fotg210->async);
1972 fotg210->async = NULL;
1975 qh_destroy(fotg210, fotg210->dummy);
1976 fotg210->dummy = NULL;
1978 /* DMA consistent memory and pools */
1979 dma_pool_destroy(fotg210->qtd_pool);
1980 fotg210->qtd_pool = NULL;
1982 dma_pool_destroy(fotg210->qh_pool);
1983 fotg210->qh_pool = NULL;
1985 dma_pool_destroy(fotg210->itd_pool);
1986 fotg210->itd_pool = NULL;
1988 if (fotg210->periodic)
1989 dma_free_coherent(fotg210_to_hcd(fotg210)->self.controller,
1990 fotg210->periodic_size * sizeof(u32),
1991 fotg210->periodic, fotg210->periodic_dma);
1992 fotg210->periodic = NULL;
1994 /* shadow periodic table */
1995 kfree(fotg210->pshadow);
1996 fotg210->pshadow = NULL;
1999 /* remember to add cleanup code (above) if you add anything here */
2000 static int fotg210_mem_init(struct fotg210_hcd *fotg210, gfp_t flags)
2004 /* QTDs for control/bulk/intr transfers */
2005 fotg210->qtd_pool = dma_pool_create("fotg210_qtd",
2006 fotg210_to_hcd(fotg210)->self.controller,
2007 sizeof(struct fotg210_qtd),
2008 32 /* byte alignment (for hw parts) */,
2009 4096 /* can't cross 4K */);
2010 if (!fotg210->qtd_pool)
2013 /* QHs for control/bulk/intr transfers */
2014 fotg210->qh_pool = dma_pool_create("fotg210_qh",
2015 fotg210_to_hcd(fotg210)->self.controller,
2016 sizeof(struct fotg210_qh_hw),
2017 32 /* byte alignment (for hw parts) */,
2018 4096 /* can't cross 4K */);
2019 if (!fotg210->qh_pool)
2022 fotg210->async = fotg210_qh_alloc(fotg210, flags);
2023 if (!fotg210->async)
2026 /* ITD for high speed ISO transfers */
2027 fotg210->itd_pool = dma_pool_create("fotg210_itd",
2028 fotg210_to_hcd(fotg210)->self.controller,
2029 sizeof(struct fotg210_itd),
2030 64 /* byte alignment (for hw parts) */,
2031 4096 /* can't cross 4K */);
2032 if (!fotg210->itd_pool)
2035 /* Hardware periodic table */
2036 fotg210->periodic = (__le32 *)
2037 dma_alloc_coherent(fotg210_to_hcd(fotg210)->self.controller,
2038 fotg210->periodic_size * sizeof(__le32),
2039 &fotg210->periodic_dma, 0);
2040 if (fotg210->periodic == NULL)
2043 for (i = 0; i < fotg210->periodic_size; i++)
2044 fotg210->periodic[i] = FOTG210_LIST_END(fotg210);
2046 /* software shadow of hardware table */
2047 fotg210->pshadow = kcalloc(fotg210->periodic_size, sizeof(void *),
2049 if (fotg210->pshadow != NULL)
2053 fotg210_dbg(fotg210, "couldn't init memory\n");
2054 fotg210_mem_cleanup(fotg210);
2057 /*-------------------------------------------------------------------------*/
2059 * EHCI hardware queue manipulation ... the core. QH/QTD manipulation.
2061 * Control, bulk, and interrupt traffic all use "qh" lists. They list "qtd"
2062 * entries describing USB transactions, max 16-20kB/entry (with 4kB-aligned
2063 * buffers needed for the larger number). We use one QH per endpoint, queue
2064 * multiple urbs (all three types) per endpoint. URBs may need several qtds.
2066 * ISO traffic uses "ISO TD" (itd) records, and (along with
2067 * interrupts) needs careful scheduling. Performance improvements can be
2068 * an ongoing challenge. That's in "ehci-sched.c".
2070 * USB 1.1 devices are handled (a) by "companion" OHCI or UHCI root hubs,
2071 * or otherwise through transaction translators (TTs) in USB 2.0 hubs using
2072 * (b) special fields in qh entries or (c) split iso entries. TTs will
2073 * buffer low/full speed data so the host collects it at high speed.
2076 /*-------------------------------------------------------------------------*/
2078 /* fill a qtd, returning how much of the buffer we were able to queue up */
2081 qtd_fill(struct fotg210_hcd *fotg210, struct fotg210_qtd *qtd, dma_addr_t buf,
2082 size_t len, int token, int maxpacket)
2087 /* one buffer entry per 4K ... first might be short or unaligned */
2088 qtd->hw_buf[0] = cpu_to_hc32(fotg210, (u32)addr);
2089 qtd->hw_buf_hi[0] = cpu_to_hc32(fotg210, (u32)(addr >> 32));
2090 count = 0x1000 - (buf & 0x0fff); /* rest of that page */
2091 if (likely(len < count)) /* ... iff needed */
2097 /* per-qtd limit: from 16K to 20K (best alignment) */
2098 for (i = 1; count < len && i < 5; i++) {
2100 qtd->hw_buf[i] = cpu_to_hc32(fotg210, (u32)addr);
2101 qtd->hw_buf_hi[i] = cpu_to_hc32(fotg210,
2104 if ((count + 0x1000) < len)
2110 /* short packets may only terminate transfers */
2112 count -= (count % maxpacket);
2114 qtd->hw_token = cpu_to_hc32(fotg210, (count << 16) | token);
2115 qtd->length = count;
2120 /*-------------------------------------------------------------------------*/
2123 qh_update(struct fotg210_hcd *fotg210, struct fotg210_qh *qh,
2124 struct fotg210_qtd *qtd)
2126 struct fotg210_qh_hw *hw = qh->hw;
2128 /* writes to an active overlay are unsafe */
2129 BUG_ON(qh->qh_state != QH_STATE_IDLE);
2131 hw->hw_qtd_next = QTD_NEXT(fotg210, qtd->qtd_dma);
2132 hw->hw_alt_next = FOTG210_LIST_END(fotg210);
2134 /* Except for control endpoints, we make hardware maintain data
2135 * toggle (like OHCI) ... here (re)initialize the toggle in the QH,
2136 * and set the pseudo-toggle in udev. Only usb_clear_halt() will
2139 if (!(hw->hw_info1 & cpu_to_hc32(fotg210, QH_TOGGLE_CTL))) {
2140 unsigned is_out, epnum;
2142 is_out = qh->is_out;
2143 epnum = (hc32_to_cpup(fotg210, &hw->hw_info1) >> 8) & 0x0f;
2144 if (unlikely(!usb_gettoggle(qh->dev, epnum, is_out))) {
2145 hw->hw_token &= ~cpu_to_hc32(fotg210, QTD_TOGGLE);
2146 usb_settoggle(qh->dev, epnum, is_out, 1);
2150 hw->hw_token &= cpu_to_hc32(fotg210, QTD_TOGGLE | QTD_STS_PING);
2153 /* if it weren't for a common silicon quirk (writing the dummy into the qh
2154 * overlay, so qh->hw_token wrongly becomes inactive/halted), only fault
2155 * recovery (including urb dequeue) would need software changes to a QH...
2158 qh_refresh(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
2160 struct fotg210_qtd *qtd;
2162 if (list_empty(&qh->qtd_list))
2165 qtd = list_entry(qh->qtd_list.next,
2166 struct fotg210_qtd, qtd_list);
2168 * first qtd may already be partially processed.
2169 * If we come here during unlink, the QH overlay region
2170 * might have reference to the just unlinked qtd. The
2171 * qtd is updated in qh_completions(). Update the QH
2174 if (cpu_to_hc32(fotg210, qtd->qtd_dma) == qh->hw->hw_current) {
2175 qh->hw->hw_qtd_next = qtd->hw_next;
2181 qh_update(fotg210, qh, qtd);
2184 /*-------------------------------------------------------------------------*/
2186 static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
2188 static void fotg210_clear_tt_buffer_complete(struct usb_hcd *hcd,
2189 struct usb_host_endpoint *ep)
2191 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
2192 struct fotg210_qh *qh = ep->hcpriv;
2193 unsigned long flags;
2195 spin_lock_irqsave(&fotg210->lock, flags);
2196 qh->clearing_tt = 0;
2197 if (qh->qh_state == QH_STATE_IDLE && !list_empty(&qh->qtd_list)
2198 && fotg210->rh_state == FOTG210_RH_RUNNING)
2199 qh_link_async(fotg210, qh);
2200 spin_unlock_irqrestore(&fotg210->lock, flags);
2203 static void fotg210_clear_tt_buffer(struct fotg210_hcd *fotg210,
2204 struct fotg210_qh *qh,
2205 struct urb *urb, u32 token)
2208 /* If an async split transaction gets an error or is unlinked,
2209 * the TT buffer may be left in an indeterminate state. We
2210 * have to clear the TT buffer.
2212 * Note: this routine is never called for Isochronous transfers.
2214 if (urb->dev->tt && !usb_pipeint(urb->pipe) && !qh->clearing_tt) {
2215 struct usb_device *tt = urb->dev->tt->hub;
2217 "clear tt buffer port %d, a%d ep%d t%08x\n",
2218 urb->dev->ttport, urb->dev->devnum,
2219 usb_pipeendpoint(urb->pipe), token);
2221 if (urb->dev->tt->hub !=
2222 fotg210_to_hcd(fotg210)->self.root_hub) {
2223 if (usb_hub_clear_tt_buffer(urb) == 0)
2224 qh->clearing_tt = 1;
2229 static int qtd_copy_status(
2230 struct fotg210_hcd *fotg210,
2236 int status = -EINPROGRESS;
2238 /* count IN/OUT bytes, not SETUP (even short packets) */
2239 if (likely(QTD_PID(token) != 2))
2240 urb->actual_length += length - QTD_LENGTH(token);
2242 /* don't modify error codes */
2243 if (unlikely(urb->unlinked))
2246 /* force cleanup after short read; not always an error */
2247 if (unlikely(IS_SHORT_READ(token)))
2248 status = -EREMOTEIO;
2250 /* serious "can't proceed" faults reported by the hardware */
2251 if (token & QTD_STS_HALT) {
2252 if (token & QTD_STS_BABBLE) {
2253 /* FIXME "must" disable babbling device's port too */
2254 status = -EOVERFLOW;
2255 /* CERR nonzero + halt --> stall */
2256 } else if (QTD_CERR(token)) {
2259 /* In theory, more than one of the following bits can be set
2260 * since they are sticky and the transaction is retried.
2261 * Which to test first is rather arbitrary.
2263 } else if (token & QTD_STS_MMF) {
2264 /* fs/ls interrupt xfer missed the complete-split */
2266 } else if (token & QTD_STS_DBE) {
2267 status = (QTD_PID(token) == 1) /* IN ? */
2268 ? -ENOSR /* hc couldn't read data */
2269 : -ECOMM; /* hc couldn't write data */
2270 } else if (token & QTD_STS_XACT) {
2271 /* timeout, bad CRC, wrong PID, etc */
2272 fotg210_dbg(fotg210, "devpath %s ep%d%s 3strikes\n",
2274 usb_pipeendpoint(urb->pipe),
2275 usb_pipein(urb->pipe) ? "in" : "out");
2277 } else { /* unknown */
2281 fotg210_dbg(fotg210,
2282 "dev%d ep%d%s qtd token %08x --> status %d\n",
2283 usb_pipedevice(urb->pipe),
2284 usb_pipeendpoint(urb->pipe),
2285 usb_pipein(urb->pipe) ? "in" : "out",
2293 fotg210_urb_done(struct fotg210_hcd *fotg210, struct urb *urb, int status)
2294 __releases(fotg210->lock)
2295 __acquires(fotg210->lock)
2297 if (likely(urb->hcpriv != NULL)) {
2298 struct fotg210_qh *qh = (struct fotg210_qh *) urb->hcpriv;
2300 /* S-mask in a QH means it's an interrupt urb */
2301 if ((qh->hw->hw_info2 & cpu_to_hc32(fotg210, QH_SMASK)) != 0) {
2303 /* ... update hc-wide periodic stats (for usbfs) */
2304 fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs--;
2308 if (unlikely(urb->unlinked)) {
2309 COUNT(fotg210->stats.unlink);
2311 /* report non-error and short read status as zero */
2312 if (status == -EINPROGRESS || status == -EREMOTEIO)
2314 COUNT(fotg210->stats.complete);
2317 #ifdef FOTG210_URB_TRACE
2318 fotg210_dbg(fotg210,
2319 "%s %s urb %p ep%d%s status %d len %d/%d\n",
2320 __func__, urb->dev->devpath, urb,
2321 usb_pipeendpoint(urb->pipe),
2322 usb_pipein(urb->pipe) ? "in" : "out",
2324 urb->actual_length, urb->transfer_buffer_length);
2327 /* complete() can reenter this HCD */
2328 usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
2329 spin_unlock(&fotg210->lock);
2330 usb_hcd_giveback_urb(fotg210_to_hcd(fotg210), urb, status);
2331 spin_lock(&fotg210->lock);
2334 static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh);
2337 * Process and free completed qtds for a qh, returning URBs to drivers.
2338 * Chases up to qh->hw_current. Returns number of completions called,
2339 * indicating how much "real" work we did.
2342 qh_completions(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
2344 struct fotg210_qtd *last, *end = qh->dummy;
2345 struct list_head *entry, *tmp;
2350 struct fotg210_qh_hw *hw = qh->hw;
2352 if (unlikely(list_empty(&qh->qtd_list)))
2355 /* completions (or tasks on other cpus) must never clobber HALT
2356 * till we've gone through and cleaned everything up, even when
2357 * they add urbs to this qh's queue or mark them for unlinking.
2359 * NOTE: unlinking expects to be done in queue order.
2361 * It's a bug for qh->qh_state to be anything other than
2362 * QH_STATE_IDLE, unless our caller is scan_async() or
2365 state = qh->qh_state;
2366 qh->qh_state = QH_STATE_COMPLETING;
2367 stopped = (state == QH_STATE_IDLE);
2371 last_status = -EINPROGRESS;
2372 qh->needs_rescan = 0;
2374 /* remove de-activated QTDs from front of queue.
2375 * after faults (including short reads), cleanup this urb
2376 * then let the queue advance.
2377 * if queue is stopped, handles unlinks.
2379 list_for_each_safe(entry, tmp, &qh->qtd_list) {
2380 struct fotg210_qtd *qtd;
2384 qtd = list_entry(entry, struct fotg210_qtd, qtd_list);
2387 /* clean up any state from previous QTD ...*/
2389 if (likely(last->urb != urb)) {
2390 fotg210_urb_done(fotg210, last->urb,
2393 last_status = -EINPROGRESS;
2395 fotg210_qtd_free(fotg210, last);
2399 /* ignore urbs submitted during completions we reported */
2403 /* hardware copies qtd out of qh overlay */
2405 token = hc32_to_cpu(fotg210, qtd->hw_token);
2407 /* always clean up qtds the hc de-activated */
2409 if ((token & QTD_STS_ACTIVE) == 0) {
2411 /* Report Data Buffer Error: non-fatal but useful */
2412 if (token & QTD_STS_DBE)
2413 fotg210_dbg(fotg210,
2414 "detected DataBufferErr for urb %p ep%d%s len %d, qtd %p [qh %p]\n",
2416 usb_endpoint_num(&urb->ep->desc),
2417 usb_endpoint_dir_in(&urb->ep->desc)
2419 urb->transfer_buffer_length,
2423 /* on STALL, error, and short reads this urb must
2424 * complete and all its qtds must be recycled.
2426 if ((token & QTD_STS_HALT) != 0) {
2428 /* retry transaction errors until we
2429 * reach the software xacterr limit
2431 if ((token & QTD_STS_XACT) &&
2432 QTD_CERR(token) == 0 &&
2433 ++qh->xacterrs < QH_XACTERR_MAX &&
2435 fotg210_dbg(fotg210,
2436 "detected XactErr len %zu/%zu retry %d\n",
2437 qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);
2439 /* reset the token in the qtd and the
2440 * qh overlay (which still contains
2441 * the qtd) so that we pick up from
2444 token &= ~QTD_STS_HALT;
2445 token |= QTD_STS_ACTIVE |
2446 (FOTG210_TUNE_CERR << 10);
2447 qtd->hw_token = cpu_to_hc32(fotg210,
2450 hw->hw_token = cpu_to_hc32(fotg210,
2456 /* magic dummy for some short reads; qh won't advance.
2457 * that silicon quirk can kick in with this dummy too.
2459 * other short reads won't stop the queue, including
2460 * control transfers (status stage handles that) or
2461 * most other single-qtd reads ... the queue stops if
2462 * URB_SHORT_NOT_OK was set so the driver submitting
2463 * the urbs could clean it up.
2465 } else if (IS_SHORT_READ(token)
2466 && !(qtd->hw_alt_next
2467 & FOTG210_LIST_END(fotg210))) {
2471 /* stop scanning when we reach qtds the hc is using */
2472 } else if (likely(!stopped
2473 && fotg210->rh_state >= FOTG210_RH_RUNNING)) {
2476 /* scan the whole queue for unlinks whenever it stops */
2480 /* cancel everything if we halt, suspend, etc */
2481 if (fotg210->rh_state < FOTG210_RH_RUNNING)
2482 last_status = -ESHUTDOWN;
2484 /* this qtd is active; skip it unless a previous qtd
2485 * for its urb faulted, or its urb was canceled.
2487 else if (last_status == -EINPROGRESS && !urb->unlinked)
2490 /* qh unlinked; token in overlay may be most current */
2491 if (state == QH_STATE_IDLE
2492 && cpu_to_hc32(fotg210, qtd->qtd_dma)
2493 == hw->hw_current) {
2494 token = hc32_to_cpu(fotg210, hw->hw_token);
2496 /* An unlink may leave an incomplete
2497 * async transaction in the TT buffer.
2498 * We have to clear it.
2500 fotg210_clear_tt_buffer(fotg210, qh, urb,
2505 /* unless we already know the urb's status, collect qtd status
2506 * and update count of bytes transferred. in common short read
2507 * cases with only one data qtd (including control transfers),
2508 * queue processing won't halt. but with two or more qtds (for
2509 * example, with a 32 KB transfer), when the first qtd gets a
2510 * short read the second must be removed by hand.
2512 if (last_status == -EINPROGRESS) {
2513 last_status = qtd_copy_status(fotg210, urb,
2514 qtd->length, token);
2515 if (last_status == -EREMOTEIO
2516 && (qtd->hw_alt_next
2517 & FOTG210_LIST_END(fotg210)))
2518 last_status = -EINPROGRESS;
2520 /* As part of low/full-speed endpoint-halt processing
2521 * we must clear the TT buffer (11.17.5).
2523 if (unlikely(last_status != -EINPROGRESS &&
2524 last_status != -EREMOTEIO)) {
2525 /* The TT's in some hubs malfunction when they
2526 * receive this request following a STALL (they
2527 * stop sending isochronous packets). Since a
2528 * STALL can't leave the TT buffer in a busy
2529 * state (if you believe Figures 11-48 - 11-51
2530 * in the USB 2.0 spec), we won't clear the TT
2531 * buffer in this case. Strictly speaking this
2532 * is a violation of the spec.
2534 if (last_status != -EPIPE)
2535 fotg210_clear_tt_buffer(fotg210, qh,
2540 /* if we're removing something not at the queue head,
2541 * patch the hardware queue pointer.
2543 if (stopped && qtd->qtd_list.prev != &qh->qtd_list) {
2544 last = list_entry(qtd->qtd_list.prev,
2545 struct fotg210_qtd, qtd_list);
2546 last->hw_next = qtd->hw_next;
2549 /* remove qtd; it's recycled after possible urb completion */
2550 list_del(&qtd->qtd_list);
2553 /* reinit the xacterr counter for the next qtd */
2557 /* last urb's completion might still need calling */
2558 if (likely(last != NULL)) {
2559 fotg210_urb_done(fotg210, last->urb, last_status);
2561 fotg210_qtd_free(fotg210, last);
2564 /* Do we need to rescan for URBs dequeued during a giveback? */
2565 if (unlikely(qh->needs_rescan)) {
2566 /* If the QH is already unlinked, do the rescan now. */
2567 if (state == QH_STATE_IDLE)
2570 /* Otherwise we have to wait until the QH is fully unlinked.
2571 * Our caller will start an unlink if qh->needs_rescan is
2572 * set. But if an unlink has already started, nothing needs
2575 if (state != QH_STATE_LINKED)
2576 qh->needs_rescan = 0;
2579 /* restore original state; caller must unlink or relink */
2580 qh->qh_state = state;
2582 /* be sure the hardware's done with the qh before refreshing
2583 * it after fault cleanup, or recovering from silicon wrongly
2584 * overlaying the dummy qtd (which reduces DMA chatter).
2586 if (stopped != 0 || hw->hw_qtd_next == FOTG210_LIST_END(fotg210)) {
2589 qh_refresh(fotg210, qh);
2591 case QH_STATE_LINKED:
2592 /* We won't refresh a QH that's linked (after the HC
2593 * stopped the queue). That avoids a race:
2594 * - HC reads first part of QH;
2595 * - CPU updates that first part and the token;
2596 * - HC reads rest of that QH, including token
2597 * Result: HC gets an inconsistent image, and then
2598 * DMAs to/from the wrong memory (corrupting it).
2600 * That should be rare for interrupt transfers,
2601 * except maybe high bandwidth ...
2604 /* Tell the caller to start an unlink */
2605 qh->needs_rescan = 1;
2607 /* otherwise, unlink already started */
2614 /*-------------------------------------------------------------------------*/
2616 /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */
2617 #define hb_mult(wMaxPacketSize) (1 + (((wMaxPacketSize) >> 11) & 0x03))
2618 /* ... and packet size, for any kind of endpoint descriptor */
2619 #define max_packet(wMaxPacketSize) ((wMaxPacketSize) & 0x07ff)
2622 * reverse of qh_urb_transaction: free a list of TDs.
2623 * used for cleanup after errors, before HC sees an URB's TDs.
2625 static void qtd_list_free(
2626 struct fotg210_hcd *fotg210,
2628 struct list_head *qtd_list
2630 struct list_head *entry, *temp;
2632 list_for_each_safe(entry, temp, qtd_list) {
2633 struct fotg210_qtd *qtd;
2635 qtd = list_entry(entry, struct fotg210_qtd, qtd_list);
2636 list_del(&qtd->qtd_list);
2637 fotg210_qtd_free(fotg210, qtd);
2642 * create a list of filled qtds for this URB; won't link into qh.
2644 static struct list_head *
2646 struct fotg210_hcd *fotg210,
2648 struct list_head *head,
2651 struct fotg210_qtd *qtd, *qtd_prev;
2653 int len, this_sg_len, maxpacket;
2657 struct scatterlist *sg;
2660 * URBs map to sequences of QTDs: one logical transaction
2662 qtd = fotg210_qtd_alloc(fotg210, flags);
2665 list_add_tail(&qtd->qtd_list, head);
2668 token = QTD_STS_ACTIVE;
2669 token |= (FOTG210_TUNE_CERR << 10);
2670 /* for split transactions, SplitXState initialized to zero */
2672 len = urb->transfer_buffer_length;
2673 is_input = usb_pipein(urb->pipe);
2674 if (usb_pipecontrol(urb->pipe)) {
2676 qtd_fill(fotg210, qtd, urb->setup_dma,
2677 sizeof(struct usb_ctrlrequest),
2678 token | (2 /* "setup" */ << 8), 8);
2680 /* ... and always at least one more pid */
2681 token ^= QTD_TOGGLE;
2683 qtd = fotg210_qtd_alloc(fotg210, flags);
2687 qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
2688 list_add_tail(&qtd->qtd_list, head);
2690 /* for zero length DATA stages, STATUS is always IN */
2692 token |= (1 /* "in" */ << 8);
2696 * data transfer stage: buffer setup
2698 i = urb->num_mapped_sgs;
2699 if (len > 0 && i > 0) {
2701 buf = sg_dma_address(sg);
2703 /* urb->transfer_buffer_length may be smaller than the
2704 * size of the scatterlist (or vice versa)
2706 this_sg_len = min_t(int, sg_dma_len(sg), len);
2709 buf = urb->transfer_dma;
2714 token |= (1 /* "in" */ << 8);
2715 /* else it's already initted to "out" pid (0 << 8) */
2717 maxpacket = max_packet(usb_maxpacket(urb->dev, urb->pipe, !is_input));
2720 * buffer gets wrapped in one or more qtds;
2721 * last one may be "short" (including zero len)
2722 * and may serve as a control status ack
2727 this_qtd_len = qtd_fill(fotg210, qtd, buf, this_sg_len, token,
2729 this_sg_len -= this_qtd_len;
2730 len -= this_qtd_len;
2731 buf += this_qtd_len;
2734 * short reads advance to a "magic" dummy instead of the next
2735 * qtd ... that forces the queue to stop, for manual cleanup.
2736 * (this will usually be overridden later.)
2739 qtd->hw_alt_next = fotg210->async->hw->hw_alt_next;
2741 /* qh makes control packets use qtd toggle; maybe switch it */
2742 if ((maxpacket & (this_qtd_len + (maxpacket - 1))) == 0)
2743 token ^= QTD_TOGGLE;
2745 if (likely(this_sg_len <= 0)) {
2746 if (--i <= 0 || len <= 0)
2749 buf = sg_dma_address(sg);
2750 this_sg_len = min_t(int, sg_dma_len(sg), len);
2754 qtd = fotg210_qtd_alloc(fotg210, flags);
2758 qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
2759 list_add_tail(&qtd->qtd_list, head);
2763 * unless the caller requires manual cleanup after short reads,
2764 * have the alt_next mechanism keep the queue running after the
2765 * last data qtd (the only one, for control and most other cases).
2767 if (likely((urb->transfer_flags & URB_SHORT_NOT_OK) == 0
2768 || usb_pipecontrol(urb->pipe)))
2769 qtd->hw_alt_next = FOTG210_LIST_END(fotg210);
2772 * control requests may need a terminating data "status" ack;
2773 * other OUT ones may need a terminating short packet
2776 if (likely(urb->transfer_buffer_length != 0)) {
2779 if (usb_pipecontrol(urb->pipe)) {
2781 token ^= 0x0100; /* "in" <--> "out" */
2782 token |= QTD_TOGGLE; /* force DATA1 */
2783 } else if (usb_pipeout(urb->pipe)
2784 && (urb->transfer_flags & URB_ZERO_PACKET)
2785 && !(urb->transfer_buffer_length % maxpacket)) {
2790 qtd = fotg210_qtd_alloc(fotg210, flags);
2794 qtd_prev->hw_next = QTD_NEXT(fotg210, qtd->qtd_dma);
2795 list_add_tail(&qtd->qtd_list, head);
2797 /* never any data in such packets */
2798 qtd_fill(fotg210, qtd, 0, 0, token, 0);
2802 /* by default, enable interrupt on urb completion */
2803 if (likely(!(urb->transfer_flags & URB_NO_INTERRUPT)))
2804 qtd->hw_token |= cpu_to_hc32(fotg210, QTD_IOC);
2808 qtd_list_free(fotg210, urb, head);
2812 /*-------------------------------------------------------------------------*/
2814 * Would be best to create all qh's from config descriptors,
2815 * when each interface/altsetting is established. Unlink
2816 * any previous qh and cancel its urbs first; endpoints are
2817 * implicitly reset then (data toggle too).
2818 * That'd mean updating how usbcore talks to HCDs. (2.7?)
2823 * Each QH holds a qtd list; a QH is used for everything except iso.
2825 * For interrupt urbs, the scheduler must set the microframe scheduling
2826 * mask(s) each time the QH gets scheduled. For highspeed, that's
2827 * just one microframe in the s-mask. For split interrupt transactions
2828 * there are additional complications: c-mask, maybe FSTNs.
2830 static struct fotg210_qh *
2832 struct fotg210_hcd *fotg210,
2836 struct fotg210_qh *qh = fotg210_qh_alloc(fotg210, flags);
2837 u32 info1 = 0, info2 = 0;
2840 struct usb_tt *tt = urb->dev->tt;
2841 struct fotg210_qh_hw *hw;
2847 * init endpoint/device data for this QH
2849 info1 |= usb_pipeendpoint(urb->pipe) << 8;
2850 info1 |= usb_pipedevice(urb->pipe) << 0;
2852 is_input = usb_pipein(urb->pipe);
2853 type = usb_pipetype(urb->pipe);
2854 maxp = usb_maxpacket(urb->dev, urb->pipe, !is_input);
2856 /* 1024 byte maxpacket is a hardware ceiling. High bandwidth
2857 * acts like up to 3KB, but is built from smaller packets.
2859 if (max_packet(maxp) > 1024) {
2860 fotg210_dbg(fotg210, "bogus qh maxpacket %d\n",
2865 /* Compute interrupt scheduling parameters just once, and save.
2866 * - allowing for high bandwidth, how many nsec/uframe are used?
2867 * - split transactions need a second CSPLIT uframe; same question
2868 * - splits also need a schedule gap (for full/low speed I/O)
2869 * - qh has a polling interval
2871 * For control/bulk requests, the HC or TT handles these.
2873 if (type == PIPE_INTERRUPT) {
2874 qh->usecs = NS_TO_US(usb_calc_bus_time(USB_SPEED_HIGH,
2876 hb_mult(maxp) * max_packet(maxp)));
2877 qh->start = NO_FRAME;
2879 if (urb->dev->speed == USB_SPEED_HIGH) {
2883 qh->period = urb->interval >> 3;
2884 if (qh->period == 0 && urb->interval != 1) {
2885 /* NOTE interval 2 or 4 uframes could work.
2886 * But interval 1 scheduling is simpler, and
2887 * includes high bandwidth.
2890 } else if (qh->period > fotg210->periodic_size) {
2891 qh->period = fotg210->periodic_size;
2892 urb->interval = qh->period << 3;
2897 /* gap is f(FS/LS transfer times) */
2898 qh->gap_uf = 1 + usb_calc_bus_time(urb->dev->speed,
2899 is_input, 0, maxp) / (125 * 1000);
2901 /* FIXME this just approximates SPLIT/CSPLIT times */
2902 if (is_input) { /* SPLIT, gap, CSPLIT+DATA */
2903 qh->c_usecs = qh->usecs + HS_USECS(0);
2904 qh->usecs = HS_USECS(1);
2905 } else { /* SPLIT+DATA, gap, CSPLIT */
2906 qh->usecs += HS_USECS(1);
2907 qh->c_usecs = HS_USECS(0);
2910 think_time = tt ? tt->think_time : 0;
2911 qh->tt_usecs = NS_TO_US(think_time +
2912 usb_calc_bus_time(urb->dev->speed,
2913 is_input, 0, max_packet(maxp)));
2914 qh->period = urb->interval;
2915 if (qh->period > fotg210->periodic_size) {
2916 qh->period = fotg210->periodic_size;
2917 urb->interval = qh->period;
2922 /* support for tt scheduling, and access to toggles */
2926 switch (urb->dev->speed) {
2928 info1 |= QH_LOW_SPEED;
2931 case USB_SPEED_FULL:
2932 /* EPS 0 means "full" */
2933 if (type != PIPE_INTERRUPT)
2934 info1 |= (FOTG210_TUNE_RL_TT << 28);
2935 if (type == PIPE_CONTROL) {
2936 info1 |= QH_CONTROL_EP; /* for TT */
2937 info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
2939 info1 |= maxp << 16;
2941 info2 |= (FOTG210_TUNE_MULT_TT << 30);
2943 /* Some Freescale processors have an erratum in which the
2944 * port number in the queue head was 0..N-1 instead of 1..N.
2946 if (fotg210_has_fsl_portno_bug(fotg210))
2947 info2 |= (urb->dev->ttport-1) << 23;
2949 info2 |= urb->dev->ttport << 23;
2951 /* set the address of the TT; for TDI's integrated
2952 * root hub tt, leave it zeroed.
2954 if (tt && tt->hub != fotg210_to_hcd(fotg210)->self.root_hub)
2955 info2 |= tt->hub->devnum << 16;
2957 /* NOTE: if (PIPE_INTERRUPT) { scheduler sets c-mask } */
2961 case USB_SPEED_HIGH: /* no TT involved */
2962 info1 |= QH_HIGH_SPEED;
2963 if (type == PIPE_CONTROL) {
2964 info1 |= (FOTG210_TUNE_RL_HS << 28);
2965 info1 |= 64 << 16; /* usb2 fixed maxpacket */
2966 info1 |= QH_TOGGLE_CTL; /* toggle from qtd */
2967 info2 |= (FOTG210_TUNE_MULT_HS << 30);
2968 } else if (type == PIPE_BULK) {
2969 info1 |= (FOTG210_TUNE_RL_HS << 28);
2970 /* The USB spec says that high speed bulk endpoints
2971 * always use 512 byte maxpacket. But some device
2972 * vendors decided to ignore that, and MSFT is happy
2973 * to help them do so. So now people expect to use
2974 * such nonconformant devices with Linux too; sigh.
2976 info1 |= max_packet(maxp) << 16;
2977 info2 |= (FOTG210_TUNE_MULT_HS << 30);
2978 } else { /* PIPE_INTERRUPT */
2979 info1 |= max_packet(maxp) << 16;
2980 info2 |= hb_mult(maxp) << 30;
2984 fotg210_dbg(fotg210, "bogus dev %p speed %d\n", urb->dev,
2987 qh_destroy(fotg210, qh);
2991 /* NOTE: if (PIPE_INTERRUPT) { scheduler sets s-mask } */
2993 /* init as live, toggle clear, advance to dummy */
2994 qh->qh_state = QH_STATE_IDLE;
2996 hw->hw_info1 = cpu_to_hc32(fotg210, info1);
2997 hw->hw_info2 = cpu_to_hc32(fotg210, info2);
2998 qh->is_out = !is_input;
2999 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe), !is_input, 1);
3000 qh_refresh(fotg210, qh);
3004 /*-------------------------------------------------------------------------*/
3006 static void enable_async(struct fotg210_hcd *fotg210)
3008 if (fotg210->async_count++)
3011 /* Stop waiting to turn off the async schedule */
3012 fotg210->enabled_hrtimer_events &= ~BIT(FOTG210_HRTIMER_DISABLE_ASYNC);
3014 /* Don't start the schedule until ASS is 0 */
3015 fotg210_poll_ASS(fotg210);
3016 turn_on_io_watchdog(fotg210);
3019 static void disable_async(struct fotg210_hcd *fotg210)
3021 if (--fotg210->async_count)
3024 /* The async schedule and async_unlink list are supposed to be empty */
3025 WARN_ON(fotg210->async->qh_next.qh || fotg210->async_unlink);
3027 /* Don't turn off the schedule until ASS is 1 */
3028 fotg210_poll_ASS(fotg210);
3031 /* move qh (and its qtds) onto async queue; maybe enable queue. */
3033 static void qh_link_async(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
3035 __hc32 dma = QH_NEXT(fotg210, qh->qh_dma);
3036 struct fotg210_qh *head;
3038 /* Don't link a QH if there's a Clear-TT-Buffer pending */
3039 if (unlikely(qh->clearing_tt))
3042 WARN_ON(qh->qh_state != QH_STATE_IDLE);
3044 /* clear halt and/or toggle; and maybe recover from silicon quirk */
3045 qh_refresh(fotg210, qh);
3047 /* splice right after start */
3048 head = fotg210->async;
3049 qh->qh_next = head->qh_next;
3050 qh->hw->hw_next = head->hw->hw_next;
3053 head->qh_next.qh = qh;
3054 head->hw->hw_next = dma;
3057 qh->qh_state = QH_STATE_LINKED;
3058 /* qtd completions reported later by interrupt */
3060 enable_async(fotg210);
3063 /*-------------------------------------------------------------------------*/
3066 * For control/bulk/interrupt, return QH with these TDs appended.
3067 * Allocates and initializes the QH if necessary.
3068 * Returns null if it can't allocate a QH it needs to.
3069 * If the QH has TDs (urbs) already, that's great.
3071 static struct fotg210_qh *qh_append_tds(
3072 struct fotg210_hcd *fotg210,
3074 struct list_head *qtd_list,
3079 struct fotg210_qh *qh = NULL;
3080 __hc32 qh_addr_mask = cpu_to_hc32(fotg210, 0x7f);
3082 qh = (struct fotg210_qh *) *ptr;
3083 if (unlikely(qh == NULL)) {
3084 /* can't sleep here, we have fotg210->lock... */
3085 qh = qh_make(fotg210, urb, GFP_ATOMIC);
3088 if (likely(qh != NULL)) {
3089 struct fotg210_qtd *qtd;
3091 if (unlikely(list_empty(qtd_list)))
3094 qtd = list_entry(qtd_list->next, struct fotg210_qtd,
3097 /* control qh may need patching ... */
3098 if (unlikely(epnum == 0)) {
3099 /* usb_reset_device() briefly reverts to address 0 */
3100 if (usb_pipedevice(urb->pipe) == 0)
3101 qh->hw->hw_info1 &= ~qh_addr_mask;
3104 /* just one way to queue requests: swap with the dummy qtd.
3105 * only hc or qh_refresh() ever modify the overlay.
3107 if (likely(qtd != NULL)) {
3108 struct fotg210_qtd *dummy;
3112 /* to avoid racing the HC, use the dummy td instead of
3113 * the first td of our list (becomes new dummy). both
3114 * tds stay deactivated until we're done, when the
3115 * HC is allowed to fetch the old dummy (4.10.2).
3117 token = qtd->hw_token;
3118 qtd->hw_token = HALT_BIT(fotg210);
3122 dma = dummy->qtd_dma;
3124 dummy->qtd_dma = dma;
3126 list_del(&qtd->qtd_list);
3127 list_add(&dummy->qtd_list, qtd_list);
3128 list_splice_tail(qtd_list, &qh->qtd_list);
3130 fotg210_qtd_init(fotg210, qtd, qtd->qtd_dma);
3133 /* hc must see the new dummy at list end */
3135 qtd = list_entry(qh->qtd_list.prev,
3136 struct fotg210_qtd, qtd_list);
3137 qtd->hw_next = QTD_NEXT(fotg210, dma);
3139 /* let the hc process these next qtds */
3141 dummy->hw_token = token;
3149 /*-------------------------------------------------------------------------*/
3153 struct fotg210_hcd *fotg210,
3155 struct list_head *qtd_list,
3159 unsigned long flags;
3160 struct fotg210_qh *qh = NULL;
3163 epnum = urb->ep->desc.bEndpointAddress;
3165 #ifdef FOTG210_URB_TRACE
3167 struct fotg210_qtd *qtd;
3168 qtd = list_entry(qtd_list->next, struct fotg210_qtd, qtd_list);
3169 fotg210_dbg(fotg210,
3170 "%s %s urb %p ep%d%s len %d, qtd %p [qh %p]\n",
3171 __func__, urb->dev->devpath, urb,
3172 epnum & 0x0f, (epnum & USB_DIR_IN) ? "in" : "out",
3173 urb->transfer_buffer_length,
3174 qtd, urb->ep->hcpriv);
3178 spin_lock_irqsave(&fotg210->lock, flags);
3179 if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
3183 rc = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
3187 qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
3188 if (unlikely(qh == NULL)) {
3189 usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
3194 /* Control/bulk operations through TTs don't need scheduling,
3195 * the HC and TT handle it when the TT has a buffer ready.
3197 if (likely(qh->qh_state == QH_STATE_IDLE))
3198 qh_link_async(fotg210, qh);
3200 spin_unlock_irqrestore(&fotg210->lock, flags);
3201 if (unlikely(qh == NULL))
3202 qtd_list_free(fotg210, urb, qtd_list);
3206 /*-------------------------------------------------------------------------*/
3208 static void single_unlink_async(struct fotg210_hcd *fotg210,
3209 struct fotg210_qh *qh)
3211 struct fotg210_qh *prev;
3213 /* Add to the end of the list of QHs waiting for the next IAAD */
3214 qh->qh_state = QH_STATE_UNLINK;
3215 if (fotg210->async_unlink)
3216 fotg210->async_unlink_last->unlink_next = qh;
3218 fotg210->async_unlink = qh;
3219 fotg210->async_unlink_last = qh;
3221 /* Unlink it from the schedule */
3222 prev = fotg210->async;
3223 while (prev->qh_next.qh != qh)
3224 prev = prev->qh_next.qh;
3226 prev->hw->hw_next = qh->hw->hw_next;
3227 prev->qh_next = qh->qh_next;
3228 if (fotg210->qh_scan_next == qh)
3229 fotg210->qh_scan_next = qh->qh_next.qh;
3232 static void start_iaa_cycle(struct fotg210_hcd *fotg210, bool nested)
3235 * Do nothing if an IAA cycle is already running or
3236 * if one will be started shortly.
3238 if (fotg210->async_iaa || fotg210->async_unlinking)
3241 /* Do all the waiting QHs at once */
3242 fotg210->async_iaa = fotg210->async_unlink;
3243 fotg210->async_unlink = NULL;
3245 /* If the controller isn't running, we don't have to wait for it */
3246 if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING)) {
3247 if (!nested) /* Avoid recursion */
3248 end_unlink_async(fotg210);
3250 /* Otherwise start a new IAA cycle */
3251 } else if (likely(fotg210->rh_state == FOTG210_RH_RUNNING)) {
3252 /* Make sure the unlinks are all visible to the hardware */
3255 fotg210_writel(fotg210, fotg210->command | CMD_IAAD,
3256 &fotg210->regs->command);
3257 fotg210_readl(fotg210, &fotg210->regs->command);
3258 fotg210_enable_event(fotg210, FOTG210_HRTIMER_IAA_WATCHDOG,
3263 /* the async qh for the qtds being unlinked are now gone from the HC */
3265 static void end_unlink_async(struct fotg210_hcd *fotg210)
3267 struct fotg210_qh *qh;
3269 /* Process the idle QHs */
3271 fotg210->async_unlinking = true;
3272 while (fotg210->async_iaa) {
3273 qh = fotg210->async_iaa;
3274 fotg210->async_iaa = qh->unlink_next;
3275 qh->unlink_next = NULL;
3277 qh->qh_state = QH_STATE_IDLE;
3278 qh->qh_next.qh = NULL;
3280 qh_completions(fotg210, qh);
3281 if (!list_empty(&qh->qtd_list) &&
3282 fotg210->rh_state == FOTG210_RH_RUNNING)
3283 qh_link_async(fotg210, qh);
3284 disable_async(fotg210);
3286 fotg210->async_unlinking = false;
3288 /* Start a new IAA cycle if any QHs are waiting for it */
3289 if (fotg210->async_unlink) {
3290 start_iaa_cycle(fotg210, true);
3291 if (unlikely(fotg210->rh_state < FOTG210_RH_RUNNING))
3296 static void unlink_empty_async(struct fotg210_hcd *fotg210)
3298 struct fotg210_qh *qh, *next;
3299 bool stopped = (fotg210->rh_state < FOTG210_RH_RUNNING);
3300 bool check_unlinks_later = false;
3302 /* Unlink all the async QHs that have been empty for a timer cycle */
3303 next = fotg210->async->qh_next.qh;
3306 next = qh->qh_next.qh;
3308 if (list_empty(&qh->qtd_list) &&
3309 qh->qh_state == QH_STATE_LINKED) {
3310 if (!stopped && qh->unlink_cycle ==
3311 fotg210->async_unlink_cycle)
3312 check_unlinks_later = true;
3314 single_unlink_async(fotg210, qh);
3318 /* Start a new IAA cycle if any QHs are waiting for it */
3319 if (fotg210->async_unlink)
3320 start_iaa_cycle(fotg210, false);
3322 /* QHs that haven't been empty for long enough will be handled later */
3323 if (check_unlinks_later) {
3324 fotg210_enable_event(fotg210, FOTG210_HRTIMER_ASYNC_UNLINKS,
3326 ++fotg210->async_unlink_cycle;
3330 /* makes sure the async qh will become idle */
3331 /* caller must own fotg210->lock */
3333 static void start_unlink_async(struct fotg210_hcd *fotg210,
3334 struct fotg210_qh *qh)
3337 * If the QH isn't linked then there's nothing we can do
3338 * unless we were called during a giveback, in which case
3339 * qh_completions() has to deal with it.
3341 if (qh->qh_state != QH_STATE_LINKED) {
3342 if (qh->qh_state == QH_STATE_COMPLETING)
3343 qh->needs_rescan = 1;
3347 single_unlink_async(fotg210, qh);
3348 start_iaa_cycle(fotg210, false);
3351 /*-------------------------------------------------------------------------*/
3353 static void scan_async(struct fotg210_hcd *fotg210)
3355 struct fotg210_qh *qh;
3356 bool check_unlinks_later = false;
3358 fotg210->qh_scan_next = fotg210->async->qh_next.qh;
3359 while (fotg210->qh_scan_next) {
3360 qh = fotg210->qh_scan_next;
3361 fotg210->qh_scan_next = qh->qh_next.qh;
3363 /* clean any finished work for this qh */
3364 if (!list_empty(&qh->qtd_list)) {
3368 * Unlinks could happen here; completion reporting
3369 * drops the lock. That's why fotg210->qh_scan_next
3370 * always holds the next qh to scan; if the next qh
3371 * gets unlinked then fotg210->qh_scan_next is adjusted
3372 * in single_unlink_async().
3374 temp = qh_completions(fotg210, qh);
3375 if (qh->needs_rescan) {
3376 start_unlink_async(fotg210, qh);
3377 } else if (list_empty(&qh->qtd_list)
3378 && qh->qh_state == QH_STATE_LINKED) {
3379 qh->unlink_cycle = fotg210->async_unlink_cycle;
3380 check_unlinks_later = true;
3381 } else if (temp != 0)
3387 * Unlink empty entries, reducing DMA usage as well
3388 * as HCD schedule-scanning costs. Delay for any qh
3389 * we just scanned, there's a not-unusual case that it
3390 * doesn't stay idle for long.
3392 if (check_unlinks_later && fotg210->rh_state == FOTG210_RH_RUNNING &&
3393 !(fotg210->enabled_hrtimer_events &
3394 BIT(FOTG210_HRTIMER_ASYNC_UNLINKS))) {
3395 fotg210_enable_event(fotg210,
3396 FOTG210_HRTIMER_ASYNC_UNLINKS, true);
3397 ++fotg210->async_unlink_cycle;
3400 /*-------------------------------------------------------------------------*/
3402 * EHCI scheduled transaction support: interrupt, iso, split iso
3403 * These are called "periodic" transactions in the EHCI spec.
3405 * Note that for interrupt transfers, the QH/QTD manipulation is shared
3406 * with the "asynchronous" transaction support (control/bulk transfers).
3407 * The only real difference is in how interrupt transfers are scheduled.
3409 * For ISO, we make an "iso_stream" head to serve the same role as a QH.
3410 * It keeps track of every ITD (or SITD) that's linked, and holds enough
3411 * pre-calculated schedule data to make appending to the queue be quick.
3414 static int fotg210_get_frame(struct usb_hcd *hcd);
3416 /*-------------------------------------------------------------------------*/
3419 * periodic_next_shadow - return "next" pointer on shadow list
3420 * @periodic: host pointer to qh/itd
3421 * @tag: hardware tag for type of this record
3423 static union fotg210_shadow *
3424 periodic_next_shadow(struct fotg210_hcd *fotg210,
3425 union fotg210_shadow *periodic, __hc32 tag)
3427 switch (hc32_to_cpu(fotg210, tag)) {
3429 return &periodic->qh->qh_next;
3431 return &periodic->fstn->fstn_next;
3433 return &periodic->itd->itd_next;
3438 shadow_next_periodic(struct fotg210_hcd *fotg210,
3439 union fotg210_shadow *periodic, __hc32 tag)
3441 switch (hc32_to_cpu(fotg210, tag)) {
3442 /* our fotg210_shadow.qh is actually software part */
3444 return &periodic->qh->hw->hw_next;
3445 /* others are hw parts */
3447 return periodic->hw_next;
3451 /* caller must hold fotg210->lock */
3452 static void periodic_unlink(struct fotg210_hcd *fotg210, unsigned frame,
3455 union fotg210_shadow *prev_p = &fotg210->pshadow[frame];
3456 __hc32 *hw_p = &fotg210->periodic[frame];
3457 union fotg210_shadow here = *prev_p;
3459 /* find predecessor of "ptr"; hw and shadow lists are in sync */
3460 while (here.ptr && here.ptr != ptr) {
3461 prev_p = periodic_next_shadow(fotg210, prev_p,
3462 Q_NEXT_TYPE(fotg210, *hw_p));
3463 hw_p = shadow_next_periodic(fotg210, &here,
3464 Q_NEXT_TYPE(fotg210, *hw_p));
3467 /* an interrupt entry (at list end) could have been shared */
3471 /* update shadow and hardware lists ... the old "next" pointers
3472 * from ptr may still be in use, the caller updates them.
3474 *prev_p = *periodic_next_shadow(fotg210, &here,
3475 Q_NEXT_TYPE(fotg210, *hw_p));
3477 *hw_p = *shadow_next_periodic(fotg210, &here,
3478 Q_NEXT_TYPE(fotg210, *hw_p));
3481 /* how many of the uframe's 125 usecs are allocated? */
3482 static unsigned short
3483 periodic_usecs(struct fotg210_hcd *fotg210, unsigned frame, unsigned uframe)
3485 __hc32 *hw_p = &fotg210->periodic[frame];
3486 union fotg210_shadow *q = &fotg210->pshadow[frame];
3488 struct fotg210_qh_hw *hw;
3491 switch (hc32_to_cpu(fotg210, Q_NEXT_TYPE(fotg210, *hw_p))) {
3494 /* is it in the S-mask? */
3495 if (hw->hw_info2 & cpu_to_hc32(fotg210, 1 << uframe))
3496 usecs += q->qh->usecs;
3497 /* ... or C-mask? */
3498 if (hw->hw_info2 & cpu_to_hc32(fotg210,
3500 usecs += q->qh->c_usecs;
3501 hw_p = &hw->hw_next;
3502 q = &q->qh->qh_next;
3504 /* case Q_TYPE_FSTN: */
3506 /* for "save place" FSTNs, count the relevant INTR
3507 * bandwidth from the previous frame
3509 if (q->fstn->hw_prev != FOTG210_LIST_END(fotg210))
3510 fotg210_dbg(fotg210, "ignoring FSTN cost ...\n");
3512 hw_p = &q->fstn->hw_next;
3513 q = &q->fstn->fstn_next;
3516 if (q->itd->hw_transaction[uframe])
3517 usecs += q->itd->stream->usecs;
3518 hw_p = &q->itd->hw_next;
3519 q = &q->itd->itd_next;
3523 if (usecs > fotg210->uframe_periodic_max)
3524 fotg210_err(fotg210, "uframe %d sched overrun: %d usecs\n",
3525 frame * 8 + uframe, usecs);
3529 /*-------------------------------------------------------------------------*/
3531 static int same_tt(struct usb_device *dev1, struct usb_device *dev2)
3533 if (!dev1->tt || !dev2->tt)
3535 if (dev1->tt != dev2->tt)
3537 if (dev1->tt->multi)
3538 return dev1->ttport == dev2->ttport;
3543 /* return true iff the device's transaction translator is available
3544 * for a periodic transfer starting at the specified frame, using
3545 * all the uframes in the mask.
3547 static int tt_no_collision(
3548 struct fotg210_hcd *fotg210,
3550 struct usb_device *dev,
3555 if (period == 0) /* error */
3558 /* note bandwidth wastage: split never follows csplit
3559 * (different dev or endpoint) until the next uframe.
3560 * calling convention doesn't make that distinction.
3562 for (; frame < fotg210->periodic_size; frame += period) {
3563 union fotg210_shadow here;
3565 struct fotg210_qh_hw *hw;
3567 here = fotg210->pshadow[frame];
3568 type = Q_NEXT_TYPE(fotg210, fotg210->periodic[frame]);
3570 switch (hc32_to_cpu(fotg210, type)) {
3572 type = Q_NEXT_TYPE(fotg210, here.itd->hw_next);
3573 here = here.itd->itd_next;
3577 if (same_tt(dev, here.qh->dev)) {
3580 mask = hc32_to_cpu(fotg210,
3582 /* "knows" no gap is needed */
3587 type = Q_NEXT_TYPE(fotg210, hw->hw_next);
3588 here = here.qh->qh_next;
3590 /* case Q_TYPE_FSTN: */
3592 fotg210_dbg(fotg210,
3593 "periodic frame %d bogus type %d\n",
3597 /* collision or error */
3606 /*-------------------------------------------------------------------------*/
3608 static void enable_periodic(struct fotg210_hcd *fotg210)
3610 if (fotg210->periodic_count++)
3613 /* Stop waiting to turn off the periodic schedule */
3614 fotg210->enabled_hrtimer_events &=
3615 ~BIT(FOTG210_HRTIMER_DISABLE_PERIODIC);
3617 /* Don't start the schedule until PSS is 0 */
3618 fotg210_poll_PSS(fotg210);
3619 turn_on_io_watchdog(fotg210);
3622 static void disable_periodic(struct fotg210_hcd *fotg210)
3624 if (--fotg210->periodic_count)
3627 /* Don't turn off the schedule until PSS is 1 */
3628 fotg210_poll_PSS(fotg210);
3631 /*-------------------------------------------------------------------------*/
3633 /* periodic schedule slots have iso tds (normal or split) first, then a
3634 * sparse tree for active interrupt transfers.
3636 * this just links in a qh; caller guarantees uframe masks are set right.
3637 * no FSTN support (yet; fotg210 0.96+)
3639 static void qh_link_periodic(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
3642 unsigned period = qh->period;
3644 dev_dbg(&qh->dev->dev,
3645 "link qh%d-%04x/%p start %d [%d/%d us]\n",
3646 period, hc32_to_cpup(fotg210, &qh->hw->hw_info2)
3647 & (QH_CMASK | QH_SMASK),
3648 qh, qh->start, qh->usecs, qh->c_usecs);
3650 /* high bandwidth, or otherwise every microframe */
3654 for (i = qh->start; i < fotg210->periodic_size; i += period) {
3655 union fotg210_shadow *prev = &fotg210->pshadow[i];
3656 __hc32 *hw_p = &fotg210->periodic[i];
3657 union fotg210_shadow here = *prev;
3660 /* skip the iso nodes at list head */
3662 type = Q_NEXT_TYPE(fotg210, *hw_p);
3663 if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
3665 prev = periodic_next_shadow(fotg210, prev, type);
3666 hw_p = shadow_next_periodic(fotg210, &here, type);
3670 /* sorting each branch by period (slow-->fast)
3671 * enables sharing interior tree nodes
3673 while (here.ptr && qh != here.qh) {
3674 if (qh->period > here.qh->period)
3676 prev = &here.qh->qh_next;
3677 hw_p = &here.qh->hw->hw_next;
3680 /* link in this qh, unless some earlier pass did that */
3681 if (qh != here.qh) {
3684 qh->hw->hw_next = *hw_p;
3687 *hw_p = QH_NEXT(fotg210, qh->qh_dma);
3690 qh->qh_state = QH_STATE_LINKED;
3693 /* update per-qh bandwidth for usbfs */
3694 fotg210_to_hcd(fotg210)->self.bandwidth_allocated += qh->period
3695 ? ((qh->usecs + qh->c_usecs) / qh->period)
3698 list_add(&qh->intr_node, &fotg210->intr_qh_list);
3700 /* maybe enable periodic schedule processing */
3701 ++fotg210->intr_count;
3702 enable_periodic(fotg210);
3705 static void qh_unlink_periodic(struct fotg210_hcd *fotg210,
3706 struct fotg210_qh *qh)
3712 * If qh is for a low/full-speed device, simply unlinking it
3713 * could interfere with an ongoing split transaction. To unlink
3714 * it safely would require setting the QH_INACTIVATE bit and
3715 * waiting at least one frame, as described in EHCI 4.12.2.5.
3717 * We won't bother with any of this. Instead, we assume that the
3718 * only reason for unlinking an interrupt QH while the current URB
3719 * is still active is to dequeue all the URBs (flush the whole
3722 * If rebalancing the periodic schedule is ever implemented, this
3723 * approach will no longer be valid.
3726 /* high bandwidth, or otherwise part of every microframe */
3727 period = qh->period;
3731 for (i = qh->start; i < fotg210->periodic_size; i += period)
3732 periodic_unlink(fotg210, i, qh);
3734 /* update per-qh bandwidth for usbfs */
3735 fotg210_to_hcd(fotg210)->self.bandwidth_allocated -= qh->period
3736 ? ((qh->usecs + qh->c_usecs) / qh->period)
3739 dev_dbg(&qh->dev->dev,
3740 "unlink qh%d-%04x/%p start %d [%d/%d us]\n",
3742 hc32_to_cpup(fotg210, &qh->hw->hw_info2) &
3743 (QH_CMASK | QH_SMASK), qh, qh->start, qh->usecs, qh->c_usecs);
3745 /* qh->qh_next still "live" to HC */
3746 qh->qh_state = QH_STATE_UNLINK;
3747 qh->qh_next.ptr = NULL;
3749 if (fotg210->qh_scan_next == qh)
3750 fotg210->qh_scan_next = list_entry(qh->intr_node.next,
3751 struct fotg210_qh, intr_node);
3752 list_del(&qh->intr_node);
3755 static void start_unlink_intr(struct fotg210_hcd *fotg210,
3756 struct fotg210_qh *qh)
3758 /* If the QH isn't linked then there's nothing we can do
3759 * unless we were called during a giveback, in which case
3760 * qh_completions() has to deal with it.
3762 if (qh->qh_state != QH_STATE_LINKED) {
3763 if (qh->qh_state == QH_STATE_COMPLETING)
3764 qh->needs_rescan = 1;
3768 qh_unlink_periodic(fotg210, qh);
3770 /* Make sure the unlinks are visible before starting the timer */
3774 * The EHCI spec doesn't say how long it takes the controller to
3775 * stop accessing an unlinked interrupt QH. The timer delay is
3776 * 9 uframes; presumably that will be long enough.
3778 qh->unlink_cycle = fotg210->intr_unlink_cycle;
3780 /* New entries go at the end of the intr_unlink list */
3781 if (fotg210->intr_unlink)
3782 fotg210->intr_unlink_last->unlink_next = qh;
3784 fotg210->intr_unlink = qh;
3785 fotg210->intr_unlink_last = qh;
3787 if (fotg210->intr_unlinking)
3788 ; /* Avoid recursive calls */
3789 else if (fotg210->rh_state < FOTG210_RH_RUNNING)
3790 fotg210_handle_intr_unlinks(fotg210);
3791 else if (fotg210->intr_unlink == qh) {
3792 fotg210_enable_event(fotg210, FOTG210_HRTIMER_UNLINK_INTR,
3794 ++fotg210->intr_unlink_cycle;
3798 static void end_unlink_intr(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
3800 struct fotg210_qh_hw *hw = qh->hw;
3803 qh->qh_state = QH_STATE_IDLE;
3804 hw->hw_next = FOTG210_LIST_END(fotg210);
3806 qh_completions(fotg210, qh);
3808 /* reschedule QH iff another request is queued */
3809 if (!list_empty(&qh->qtd_list) &&
3810 fotg210->rh_state == FOTG210_RH_RUNNING) {
3811 rc = qh_schedule(fotg210, qh);
3813 /* An error here likely indicates handshake failure
3814 * or no space left in the schedule. Neither fault
3815 * should happen often ...
3817 * FIXME kill the now-dysfunctional queued urbs
3820 fotg210_err(fotg210, "can't reschedule qh %p, err %d\n",
3824 /* maybe turn off periodic schedule */
3825 --fotg210->intr_count;
3826 disable_periodic(fotg210);
3829 /*-------------------------------------------------------------------------*/
3831 static int check_period(
3832 struct fotg210_hcd *fotg210,
3840 /* complete split running into next frame?
3841 * given FSTN support, we could sometimes check...
3846 /* convert "usecs we need" to "max already claimed" */
3847 usecs = fotg210->uframe_periodic_max - usecs;
3849 /* we "know" 2 and 4 uframe intervals were rejected; so
3850 * for period 0, check _every_ microframe in the schedule.
3852 if (unlikely(period == 0)) {
3854 for (uframe = 0; uframe < 7; uframe++) {
3855 claimed = periodic_usecs(fotg210, frame,
3857 if (claimed > usecs)
3860 } while ((frame += 1) < fotg210->periodic_size);
3862 /* just check the specified uframe, at that period */
3865 claimed = periodic_usecs(fotg210, frame, uframe);
3866 if (claimed > usecs)
3868 } while ((frame += period) < fotg210->periodic_size);
3875 static int check_intr_schedule(
3876 struct fotg210_hcd *fotg210,
3879 const struct fotg210_qh *qh,
3883 int retval = -ENOSPC;
3886 if (qh->c_usecs && uframe >= 6) /* FSTN territory? */
3889 if (!check_period(fotg210, frame, uframe, qh->period, qh->usecs))
3897 /* Make sure this tt's buffer is also available for CSPLITs.
3898 * We pessimize a bit; probably the typical full speed case
3899 * doesn't need the second CSPLIT.
3901 * NOTE: both SPLIT and CSPLIT could be checked in just
3904 mask = 0x03 << (uframe + qh->gap_uf);
3905 *c_maskp = cpu_to_hc32(fotg210, mask << 8);
3907 mask |= 1 << uframe;
3908 if (tt_no_collision(fotg210, qh->period, qh->dev, frame, mask)) {
3909 if (!check_period(fotg210, frame, uframe + qh->gap_uf + 1,
3910 qh->period, qh->c_usecs))
3912 if (!check_period(fotg210, frame, uframe + qh->gap_uf,
3913 qh->period, qh->c_usecs))
3921 /* "first fit" scheduling policy used the first time through,
3922 * or when the previous schedule slot can't be re-used.
3924 static int qh_schedule(struct fotg210_hcd *fotg210, struct fotg210_qh *qh)
3929 unsigned frame; /* 0..(qh->period - 1), or NO_FRAME */
3930 struct fotg210_qh_hw *hw = qh->hw;
3932 qh_refresh(fotg210, qh);
3933 hw->hw_next = FOTG210_LIST_END(fotg210);
3936 /* reuse the previous schedule slots, if we can */
3937 if (frame < qh->period) {
3938 uframe = ffs(hc32_to_cpup(fotg210, &hw->hw_info2) & QH_SMASK);
3939 status = check_intr_schedule(fotg210, frame, --uframe,
3947 /* else scan the schedule to find a group of slots such that all
3948 * uframes have enough periodic bandwidth available.
3951 /* "normal" case, uframing flexible except with splits */
3955 for (i = qh->period; status && i > 0; --i) {
3956 frame = ++fotg210->random_frame % qh->period;
3957 for (uframe = 0; uframe < 8; uframe++) {
3958 status = check_intr_schedule(fotg210,
3966 /* qh->period == 0 means every uframe */
3969 status = check_intr_schedule(fotg210, 0, 0, qh,
3976 /* reset S-frame and (maybe) C-frame masks */
3977 hw->hw_info2 &= cpu_to_hc32(fotg210, ~(QH_CMASK | QH_SMASK));
3978 hw->hw_info2 |= qh->period
3979 ? cpu_to_hc32(fotg210, 1 << uframe)
3980 : cpu_to_hc32(fotg210, QH_SMASK);
3981 hw->hw_info2 |= c_mask;
3983 fotg210_dbg(fotg210, "reused qh %p schedule\n", qh);
3985 /* stuff into the periodic schedule */
3986 qh_link_periodic(fotg210, qh);
3991 static int intr_submit(
3992 struct fotg210_hcd *fotg210,
3994 struct list_head *qtd_list,
3998 unsigned long flags;
3999 struct fotg210_qh *qh;
4001 struct list_head empty;
4003 /* get endpoint and transfer/schedule data */
4004 epnum = urb->ep->desc.bEndpointAddress;
4006 spin_lock_irqsave(&fotg210->lock, flags);
4008 if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
4009 status = -ESHUTDOWN;
4010 goto done_not_linked;
4012 status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
4013 if (unlikely(status))
4014 goto done_not_linked;
4016 /* get qh and force any scheduling errors */
4017 INIT_LIST_HEAD(&empty);
4018 qh = qh_append_tds(fotg210, urb, &empty, epnum, &urb->ep->hcpriv);
4023 if (qh->qh_state == QH_STATE_IDLE) {
4024 status = qh_schedule(fotg210, qh);
4029 /* then queue the urb's tds to the qh */
4030 qh = qh_append_tds(fotg210, urb, qtd_list, epnum, &urb->ep->hcpriv);
4033 /* ... update usbfs periodic stats */
4034 fotg210_to_hcd(fotg210)->self.bandwidth_int_reqs++;
4037 if (unlikely(status))
4038 usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
4040 spin_unlock_irqrestore(&fotg210->lock, flags);
4042 qtd_list_free(fotg210, urb, qtd_list);
4047 static void scan_intr(struct fotg210_hcd *fotg210)
4049 struct fotg210_qh *qh;
4051 list_for_each_entry_safe(qh, fotg210->qh_scan_next,
4052 &fotg210->intr_qh_list, intr_node) {
4054 /* clean any finished work for this qh */
4055 if (!list_empty(&qh->qtd_list)) {
4059 * Unlinks could happen here; completion reporting
4060 * drops the lock. That's why fotg210->qh_scan_next
4061 * always holds the next qh to scan; if the next qh
4062 * gets unlinked then fotg210->qh_scan_next is adjusted
4063 * in qh_unlink_periodic().
4065 temp = qh_completions(fotg210, qh);
4066 if (unlikely(qh->needs_rescan ||
4067 (list_empty(&qh->qtd_list) &&
4068 qh->qh_state == QH_STATE_LINKED)))
4069 start_unlink_intr(fotg210, qh);
4076 /*-------------------------------------------------------------------------*/
4078 /* fotg210_iso_stream ops work with both ITD and SITD */
4080 static struct fotg210_iso_stream *
4081 iso_stream_alloc(gfp_t mem_flags)
4083 struct fotg210_iso_stream *stream;
4085 stream = kzalloc(sizeof(*stream), mem_flags);
4086 if (likely(stream != NULL)) {
4087 INIT_LIST_HEAD(&stream->td_list);
4088 INIT_LIST_HEAD(&stream->free_list);
4089 stream->next_uframe = -1;
4096 struct fotg210_hcd *fotg210,
4097 struct fotg210_iso_stream *stream,
4098 struct usb_device *dev,
4104 unsigned epnum, maxp;
4110 * this might be a "high bandwidth" highspeed endpoint,
4111 * as encoded in the ep descriptor's wMaxPacket field
4113 epnum = usb_pipeendpoint(pipe);
4114 is_input = usb_pipein(pipe) ? USB_DIR_IN : 0;
4115 maxp = usb_maxpacket(dev, pipe, !is_input);
4121 maxp = max_packet(maxp);
4122 multi = hb_mult(maxp);
4126 stream->buf0 = cpu_to_hc32(fotg210, (epnum << 8) | dev->devnum);
4127 stream->buf1 = cpu_to_hc32(fotg210, buf1);
4128 stream->buf2 = cpu_to_hc32(fotg210, multi);
4130 /* usbfs wants to report the average usecs per frame tied up
4131 * when transfers on this endpoint are scheduled ...
4133 if (dev->speed == USB_SPEED_FULL) {
4135 stream->usecs = NS_TO_US(usb_calc_bus_time(dev->speed,
4136 is_input, 1, maxp));
4139 stream->highspeed = 1;
4140 stream->usecs = HS_USECS_ISO(maxp);
4142 bandwidth = stream->usecs * 8;
4143 bandwidth /= interval;
4145 stream->bandwidth = bandwidth;
4147 stream->bEndpointAddress = is_input | epnum;
4148 stream->interval = interval;
4149 stream->maxp = maxp;
4152 static struct fotg210_iso_stream *
4153 iso_stream_find(struct fotg210_hcd *fotg210, struct urb *urb)
4156 struct fotg210_iso_stream *stream;
4157 struct usb_host_endpoint *ep;
4158 unsigned long flags;
4160 epnum = usb_pipeendpoint(urb->pipe);
4161 if (usb_pipein(urb->pipe))
4162 ep = urb->dev->ep_in[epnum];
4164 ep = urb->dev->ep_out[epnum];
4166 spin_lock_irqsave(&fotg210->lock, flags);
4167 stream = ep->hcpriv;
4169 if (unlikely(stream == NULL)) {
4170 stream = iso_stream_alloc(GFP_ATOMIC);
4171 if (likely(stream != NULL)) {
4172 ep->hcpriv = stream;
4174 iso_stream_init(fotg210, stream, urb->dev, urb->pipe,
4178 /* if dev->ep[epnum] is a QH, hw is set */
4179 } else if (unlikely(stream->hw != NULL)) {
4180 fotg210_dbg(fotg210, "dev %s ep%d%s, not iso??\n",
4181 urb->dev->devpath, epnum,
4182 usb_pipein(urb->pipe) ? "in" : "out");
4186 spin_unlock_irqrestore(&fotg210->lock, flags);
4190 /*-------------------------------------------------------------------------*/
4192 /* fotg210_iso_sched ops can be ITD-only or SITD-only */
4194 static struct fotg210_iso_sched *
4195 iso_sched_alloc(unsigned packets, gfp_t mem_flags)
4197 struct fotg210_iso_sched *iso_sched;
4198 int size = sizeof(*iso_sched);
4200 size += packets * sizeof(struct fotg210_iso_packet);
4201 iso_sched = kzalloc(size, mem_flags);
4202 if (likely(iso_sched != NULL))
4203 INIT_LIST_HEAD(&iso_sched->td_list);
4210 struct fotg210_hcd *fotg210,
4211 struct fotg210_iso_sched *iso_sched,
4212 struct fotg210_iso_stream *stream,
4217 dma_addr_t dma = urb->transfer_dma;
4219 /* how many uframes are needed for these transfers */
4220 iso_sched->span = urb->number_of_packets * stream->interval;
4222 /* figure out per-uframe itd fields that we'll need later
4223 * when we fit new itds into the schedule.
4225 for (i = 0; i < urb->number_of_packets; i++) {
4226 struct fotg210_iso_packet *uframe = &iso_sched->packet[i];
4231 length = urb->iso_frame_desc[i].length;
4232 buf = dma + urb->iso_frame_desc[i].offset;
4234 trans = FOTG210_ISOC_ACTIVE;
4235 trans |= buf & 0x0fff;
4236 if (unlikely(((i + 1) == urb->number_of_packets))
4237 && !(urb->transfer_flags & URB_NO_INTERRUPT))
4238 trans |= FOTG210_ITD_IOC;
4239 trans |= length << 16;
4240 uframe->transaction = cpu_to_hc32(fotg210, trans);
4242 /* might need to cross a buffer page within a uframe */
4243 uframe->bufp = (buf & ~(u64)0x0fff);
4245 if (unlikely((uframe->bufp != (buf & ~(u64)0x0fff))))
4252 struct fotg210_iso_stream *stream,
4253 struct fotg210_iso_sched *iso_sched
4258 /* caller must hold fotg210->lock!*/
4259 list_splice(&iso_sched->td_list, &stream->free_list);
4264 itd_urb_transaction(
4265 struct fotg210_iso_stream *stream,
4266 struct fotg210_hcd *fotg210,
4271 struct fotg210_itd *itd;
4275 struct fotg210_iso_sched *sched;
4276 unsigned long flags;
4278 sched = iso_sched_alloc(urb->number_of_packets, mem_flags);
4279 if (unlikely(sched == NULL))
4282 itd_sched_init(fotg210, sched, stream, urb);
4284 if (urb->interval < 8)
4285 num_itds = 1 + (sched->span + 7) / 8;
4287 num_itds = urb->number_of_packets;
4289 /* allocate/init ITDs */
4290 spin_lock_irqsave(&fotg210->lock, flags);
4291 for (i = 0; i < num_itds; i++) {
4294 * Use iTDs from the free list, but not iTDs that may
4295 * still be in use by the hardware.
4297 if (likely(!list_empty(&stream->free_list))) {
4298 itd = list_first_entry(&stream->free_list,
4299 struct fotg210_itd, itd_list);
4300 if (itd->frame == fotg210->now_frame)
4302 list_del(&itd->itd_list);
4303 itd_dma = itd->itd_dma;
4306 spin_unlock_irqrestore(&fotg210->lock, flags);
4307 itd = dma_pool_alloc(fotg210->itd_pool, mem_flags,
4309 spin_lock_irqsave(&fotg210->lock, flags);
4311 iso_sched_free(stream, sched);
4312 spin_unlock_irqrestore(&fotg210->lock, flags);
4317 memset(itd, 0, sizeof(*itd));
4318 itd->itd_dma = itd_dma;
4319 list_add(&itd->itd_list, &sched->td_list);
4321 spin_unlock_irqrestore(&fotg210->lock, flags);
4323 /* temporarily store schedule info in hcpriv */
4324 urb->hcpriv = sched;
4325 urb->error_count = 0;
4329 /*-------------------------------------------------------------------------*/
4333 struct fotg210_hcd *fotg210,
4342 /* can't commit more than uframe_periodic_max usec */
4343 if (periodic_usecs(fotg210, uframe >> 3, uframe & 0x7)
4344 > (fotg210->uframe_periodic_max - usecs))
4347 /* we know urb->interval is 2^N uframes */
4349 } while (uframe < mod);
4354 * This scheduler plans almost as far into the future as it has actual
4355 * periodic schedule slots. (Affected by TUNE_FLS, which defaults to
4356 * "as small as possible" to be cache-friendlier.) That limits the size
4357 * transfers you can stream reliably; avoid more than 64 msec per urb.
4358 * Also avoid queue depths of less than fotg210's worst irq latency (affected
4359 * by the per-urb URB_NO_INTERRUPT hint, the log2_irq_thresh module parameter,
4360 * and other factors); or more than about 230 msec total (for portability,
4361 * given FOTG210_TUNE_FLS and the slop). Or, write a smarter scheduler!
4364 #define SCHEDULE_SLOP 80 /* microframes */
4367 iso_stream_schedule(
4368 struct fotg210_hcd *fotg210,
4370 struct fotg210_iso_stream *stream
4373 u32 now, next, start, period, span;
4375 unsigned mod = fotg210->periodic_size << 3;
4376 struct fotg210_iso_sched *sched = urb->hcpriv;
4378 period = urb->interval;
4381 if (span > mod - SCHEDULE_SLOP) {
4382 fotg210_dbg(fotg210, "iso request %p too long\n", urb);
4387 now = fotg210_read_frame_index(fotg210) & (mod - 1);
4389 /* Typical case: reuse current schedule, stream is still active.
4390 * Hopefully there are no gaps from the host falling behind
4391 * (irq delays etc), but if there are we'll take the next
4392 * slot in the schedule, implicitly assuming URB_ISO_ASAP.
4394 if (likely(!list_empty(&stream->td_list))) {
4397 /* For high speed devices, allow scheduling within the
4398 * isochronous scheduling threshold. For full speed devices
4399 * and Intel PCI-based controllers, don't (work around for
4402 if (!stream->highspeed && fotg210->fs_i_thresh)
4403 next = now + fotg210->i_thresh;
4407 /* Fell behind (by up to twice the slop amount)?
4408 * We decide based on the time of the last currently-scheduled
4409 * slot, not the time of the next available slot.
4411 excess = (stream->next_uframe - period - next) & (mod - 1);
4412 if (excess >= mod - 2 * SCHEDULE_SLOP)
4413 start = next + excess - mod + period *
4414 DIV_ROUND_UP(mod - excess, period);
4416 start = next + excess + period;
4417 if (start - now >= mod) {
4418 fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
4419 urb, start - now - period, period,
4426 /* need to schedule; when's the next (u)frame we could start?
4427 * this is bigger than fotg210->i_thresh allows; scheduling itself
4428 * isn't free, the slop should handle reasonably slow cpus. it
4429 * can also help high bandwidth if the dma and irq loads don't
4430 * jump until after the queue is primed.
4434 start = SCHEDULE_SLOP + (now & ~0x07);
4436 /* NOTE: assumes URB_ISO_ASAP, to limit complexity/bugs */
4438 /* find a uframe slot with enough bandwidth.
4439 * Early uframes are more precious because full-speed
4440 * iso IN transfers can't use late uframes,
4441 * and therefore they should be allocated last.
4447 /* check schedule: enough space? */
4448 if (itd_slot_ok(fotg210, mod, start,
4449 stream->usecs, period))
4451 } while (start > next && !done);
4453 /* no room in the schedule */
4455 fotg210_dbg(fotg210, "iso resched full %p (now %d max %d)\n",
4456 urb, now, now + mod);
4462 /* Tried to schedule too far into the future? */
4463 if (unlikely(start - now + span - period
4464 >= mod - 2 * SCHEDULE_SLOP)) {
4465 fotg210_dbg(fotg210, "request %p would overflow (%d+%d >= %d)\n",
4466 urb, start - now, span - period,
4467 mod - 2 * SCHEDULE_SLOP);
4472 stream->next_uframe = start & (mod - 1);
4474 /* report high speed start in uframes; full speed, in frames */
4475 urb->start_frame = stream->next_uframe;
4476 if (!stream->highspeed)
4477 urb->start_frame >>= 3;
4479 /* Make sure scan_isoc() sees these */
4480 if (fotg210->isoc_count == 0)
4481 fotg210->next_frame = now >> 3;
4485 iso_sched_free(stream, sched);
4490 /*-------------------------------------------------------------------------*/
4493 itd_init(struct fotg210_hcd *fotg210, struct fotg210_iso_stream *stream,
4494 struct fotg210_itd *itd)
4498 /* it's been recently zeroed */
4499 itd->hw_next = FOTG210_LIST_END(fotg210);
4500 itd->hw_bufp[0] = stream->buf0;
4501 itd->hw_bufp[1] = stream->buf1;
4502 itd->hw_bufp[2] = stream->buf2;
4504 for (i = 0; i < 8; i++)
4507 /* All other fields are filled when scheduling */
4512 struct fotg210_hcd *fotg210,
4513 struct fotg210_itd *itd,
4514 struct fotg210_iso_sched *iso_sched,
4519 struct fotg210_iso_packet *uf = &iso_sched->packet[index];
4520 unsigned pg = itd->pg;
4523 itd->index[uframe] = index;
4525 itd->hw_transaction[uframe] = uf->transaction;
4526 itd->hw_transaction[uframe] |= cpu_to_hc32(fotg210, pg << 12);
4527 itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, uf->bufp & ~(u32)0);
4528 itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(uf->bufp >> 32));
4530 /* iso_frame_desc[].offset must be strictly increasing */
4531 if (unlikely(uf->cross)) {
4532 u64 bufp = uf->bufp + 4096;
4535 itd->hw_bufp[pg] |= cpu_to_hc32(fotg210, bufp & ~(u32)0);
4536 itd->hw_bufp_hi[pg] |= cpu_to_hc32(fotg210, (u32)(bufp >> 32));
4541 itd_link(struct fotg210_hcd *fotg210, unsigned frame, struct fotg210_itd *itd)
4543 union fotg210_shadow *prev = &fotg210->pshadow[frame];
4544 __hc32 *hw_p = &fotg210->periodic[frame];
4545 union fotg210_shadow here = *prev;
4548 /* skip any iso nodes which might belong to previous microframes */
4550 type = Q_NEXT_TYPE(fotg210, *hw_p);
4551 if (type == cpu_to_hc32(fotg210, Q_TYPE_QH))
4553 prev = periodic_next_shadow(fotg210, prev, type);
4554 hw_p = shadow_next_periodic(fotg210, &here, type);
4558 itd->itd_next = here;
4559 itd->hw_next = *hw_p;
4563 *hw_p = cpu_to_hc32(fotg210, itd->itd_dma | Q_TYPE_ITD);
4566 /* fit urb's itds into the selected schedule slot; activate as needed */
4567 static void itd_link_urb(
4568 struct fotg210_hcd *fotg210,
4571 struct fotg210_iso_stream *stream
4575 unsigned next_uframe, uframe, frame;
4576 struct fotg210_iso_sched *iso_sched = urb->hcpriv;
4577 struct fotg210_itd *itd;
4579 next_uframe = stream->next_uframe & (mod - 1);
4581 if (unlikely(list_empty(&stream->td_list))) {
4582 fotg210_to_hcd(fotg210)->self.bandwidth_allocated
4583 += stream->bandwidth;
4584 fotg210_dbg(fotg210,
4585 "schedule devp %s ep%d%s-iso period %d start %d.%d\n",
4586 urb->dev->devpath, stream->bEndpointAddress & 0x0f,
4587 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out",
4589 next_uframe >> 3, next_uframe & 0x7);
4592 /* fill iTDs uframe by uframe */
4593 for (packet = 0, itd = NULL; packet < urb->number_of_packets;) {
4595 /* ASSERT: we have all necessary itds */
4597 /* ASSERT: no itds for this endpoint in this uframe */
4599 itd = list_entry(iso_sched->td_list.next,
4600 struct fotg210_itd, itd_list);
4601 list_move_tail(&itd->itd_list, &stream->td_list);
4602 itd->stream = stream;
4604 itd_init(fotg210, stream, itd);
4607 uframe = next_uframe & 0x07;
4608 frame = next_uframe >> 3;
4610 itd_patch(fotg210, itd, iso_sched, packet, uframe);
4612 next_uframe += stream->interval;
4613 next_uframe &= mod - 1;
4616 /* link completed itds into the schedule */
4617 if (((next_uframe >> 3) != frame)
4618 || packet == urb->number_of_packets) {
4619 itd_link(fotg210, frame & (fotg210->periodic_size - 1),
4624 stream->next_uframe = next_uframe;
4626 /* don't need that schedule data any more */
4627 iso_sched_free(stream, iso_sched);
4630 ++fotg210->isoc_count;
4631 enable_periodic(fotg210);
4634 #define ISO_ERRS (FOTG210_ISOC_BUF_ERR | FOTG210_ISOC_BABBLE |\
4635 FOTG210_ISOC_XACTERR)
4637 /* Process and recycle a completed ITD. Return true iff its urb completed,
4638 * and hence its completion callback probably added things to the hardware
4641 * Note that we carefully avoid recycling this descriptor until after any
4642 * completion callback runs, so that it won't be reused quickly. That is,
4643 * assuming (a) no more than two urbs per frame on this endpoint, and also
4644 * (b) only this endpoint's completions submit URBs. It seems some silicon
4645 * corrupts things if you reuse completed descriptors very quickly...
4647 static bool itd_complete(struct fotg210_hcd *fotg210, struct fotg210_itd *itd)
4649 struct urb *urb = itd->urb;
4650 struct usb_iso_packet_descriptor *desc;
4654 struct fotg210_iso_stream *stream = itd->stream;
4655 struct usb_device *dev;
4656 bool retval = false;
4658 /* for each uframe with a packet */
4659 for (uframe = 0; uframe < 8; uframe++) {
4660 if (likely(itd->index[uframe] == -1))
4662 urb_index = itd->index[uframe];
4663 desc = &urb->iso_frame_desc[urb_index];
4665 t = hc32_to_cpup(fotg210, &itd->hw_transaction[uframe]);
4666 itd->hw_transaction[uframe] = 0;
4668 /* report transfer status */
4669 if (unlikely(t & ISO_ERRS)) {
4671 if (t & FOTG210_ISOC_BUF_ERR)
4672 desc->status = usb_pipein(urb->pipe)
4673 ? -ENOSR /* hc couldn't read */
4674 : -ECOMM; /* hc couldn't write */
4675 else if (t & FOTG210_ISOC_BABBLE)
4676 desc->status = -EOVERFLOW;
4677 else /* (t & FOTG210_ISOC_XACTERR) */
4678 desc->status = -EPROTO;
4680 /* HC need not update length with this error */
4681 if (!(t & FOTG210_ISOC_BABBLE)) {
4682 desc->actual_length =
4683 fotg210_itdlen(urb, desc, t);
4684 urb->actual_length += desc->actual_length;
4686 } else if (likely((t & FOTG210_ISOC_ACTIVE) == 0)) {
4688 desc->actual_length = fotg210_itdlen(urb, desc, t);
4689 urb->actual_length += desc->actual_length;
4691 /* URB was too late */
4692 desc->status = -EXDEV;
4696 /* handle completion now? */
4697 if (likely((urb_index + 1) != urb->number_of_packets))
4700 /* ASSERT: it's really the last itd for this urb
4701 list_for_each_entry (itd, &stream->td_list, itd_list)
4702 BUG_ON (itd->urb == urb);
4705 /* give urb back to the driver; completion often (re)submits */
4707 fotg210_urb_done(fotg210, urb, 0);
4711 --fotg210->isoc_count;
4712 disable_periodic(fotg210);
4714 if (unlikely(list_is_singular(&stream->td_list))) {
4715 fotg210_to_hcd(fotg210)->self.bandwidth_allocated
4716 -= stream->bandwidth;
4717 fotg210_dbg(fotg210,
4718 "deschedule devp %s ep%d%s-iso\n",
4719 dev->devpath, stream->bEndpointAddress & 0x0f,
4720 (stream->bEndpointAddress & USB_DIR_IN) ? "in" : "out");
4726 /* Add to the end of the free list for later reuse */
4727 list_move_tail(&itd->itd_list, &stream->free_list);
4729 /* Recycle the iTDs when the pipeline is empty (ep no longer in use) */
4730 if (list_empty(&stream->td_list)) {
4731 list_splice_tail_init(&stream->free_list,
4732 &fotg210->cached_itd_list);
4733 start_free_itds(fotg210);
4739 /*-------------------------------------------------------------------------*/
4741 static int itd_submit(struct fotg210_hcd *fotg210, struct urb *urb,
4744 int status = -EINVAL;
4745 unsigned long flags;
4746 struct fotg210_iso_stream *stream;
4748 /* Get iso_stream head */
4749 stream = iso_stream_find(fotg210, urb);
4750 if (unlikely(stream == NULL)) {
4751 fotg210_dbg(fotg210, "can't get iso stream\n");
4754 if (unlikely(urb->interval != stream->interval &&
4755 fotg210_port_speed(fotg210, 0) ==
4756 USB_PORT_STAT_HIGH_SPEED)) {
4757 fotg210_dbg(fotg210, "can't change iso interval %d --> %d\n",
4758 stream->interval, urb->interval);
4762 #ifdef FOTG210_URB_TRACE
4763 fotg210_dbg(fotg210,
4764 "%s %s urb %p ep%d%s len %d, %d pkts %d uframes[%p]\n",
4765 __func__, urb->dev->devpath, urb,
4766 usb_pipeendpoint(urb->pipe),
4767 usb_pipein(urb->pipe) ? "in" : "out",
4768 urb->transfer_buffer_length,
4769 urb->number_of_packets, urb->interval,
4773 /* allocate ITDs w/o locking anything */
4774 status = itd_urb_transaction(stream, fotg210, urb, mem_flags);
4775 if (unlikely(status < 0)) {
4776 fotg210_dbg(fotg210, "can't init itds\n");
4780 /* schedule ... need to lock */
4781 spin_lock_irqsave(&fotg210->lock, flags);
4782 if (unlikely(!HCD_HW_ACCESSIBLE(fotg210_to_hcd(fotg210)))) {
4783 status = -ESHUTDOWN;
4784 goto done_not_linked;
4786 status = usb_hcd_link_urb_to_ep(fotg210_to_hcd(fotg210), urb);
4787 if (unlikely(status))
4788 goto done_not_linked;
4789 status = iso_stream_schedule(fotg210, urb, stream);
4790 if (likely(status == 0))
4791 itd_link_urb(fotg210, urb, fotg210->periodic_size << 3, stream);
4793 usb_hcd_unlink_urb_from_ep(fotg210_to_hcd(fotg210), urb);
4795 spin_unlock_irqrestore(&fotg210->lock, flags);
4800 /*-------------------------------------------------------------------------*/
4802 static void scan_isoc(struct fotg210_hcd *fotg210)
4804 unsigned uf, now_frame, frame;
4805 unsigned fmask = fotg210->periodic_size - 1;
4806 bool modified, live;
4809 * When running, scan from last scan point up to "now"
4810 * else clean up by scanning everything that's left.
4811 * Touches as few pages as possible: cache-friendly.
4813 if (fotg210->rh_state >= FOTG210_RH_RUNNING) {
4814 uf = fotg210_read_frame_index(fotg210);
4815 now_frame = (uf >> 3) & fmask;
4818 now_frame = (fotg210->next_frame - 1) & fmask;
4821 fotg210->now_frame = now_frame;
4823 frame = fotg210->next_frame;
4825 union fotg210_shadow q, *q_p;
4829 /* scan each element in frame's queue for completions */
4830 q_p = &fotg210->pshadow[frame];
4831 hw_p = &fotg210->periodic[frame];
4833 type = Q_NEXT_TYPE(fotg210, *hw_p);
4836 while (q.ptr != NULL) {
4837 switch (hc32_to_cpu(fotg210, type)) {
4839 /* If this ITD is still active, leave it for
4840 * later processing ... check the next entry.
4841 * No need to check for activity unless the
4844 if (frame == now_frame && live) {
4846 for (uf = 0; uf < 8; uf++) {
4847 if (q.itd->hw_transaction[uf] &
4848 ITD_ACTIVE(fotg210))
4852 q_p = &q.itd->itd_next;
4853 hw_p = &q.itd->hw_next;
4854 type = Q_NEXT_TYPE(fotg210,
4861 /* Take finished ITDs out of the schedule
4862 * and process them: recycle, maybe report
4863 * URB completion. HC won't cache the
4864 * pointer for much longer, if at all.
4866 *q_p = q.itd->itd_next;
4867 *hw_p = q.itd->hw_next;
4868 type = Q_NEXT_TYPE(fotg210, q.itd->hw_next);
4870 modified = itd_complete(fotg210, q.itd);
4874 fotg210_dbg(fotg210, "corrupt type %d frame %d shadow %p\n",
4875 type, frame, q.ptr);
4879 /* End of the iTDs and siTDs */
4884 /* assume completion callbacks modify the queue */
4885 if (unlikely(modified && fotg210->isoc_count > 0))
4889 /* Stop when we have reached the current frame */
4890 if (frame == now_frame)
4892 frame = (frame + 1) & fmask;
4894 fotg210->next_frame = now_frame;
4896 /*-------------------------------------------------------------------------*/
4898 * Display / Set uframe_periodic_max
4900 static ssize_t show_uframe_periodic_max(struct device *dev,
4901 struct device_attribute *attr,
4904 struct fotg210_hcd *fotg210;
4907 fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
4908 n = scnprintf(buf, PAGE_SIZE, "%d\n", fotg210->uframe_periodic_max);
4913 static ssize_t store_uframe_periodic_max(struct device *dev,
4914 struct device_attribute *attr,
4915 const char *buf, size_t count)
4917 struct fotg210_hcd *fotg210;
4918 unsigned uframe_periodic_max;
4919 unsigned frame, uframe;
4920 unsigned short allocated_max;
4921 unsigned long flags;
4924 fotg210 = hcd_to_fotg210(bus_to_hcd(dev_get_drvdata(dev)));
4925 if (kstrtouint(buf, 0, &uframe_periodic_max) < 0)
4928 if (uframe_periodic_max < 100 || uframe_periodic_max >= 125) {
4929 fotg210_info(fotg210, "rejecting invalid request for uframe_periodic_max=%u\n",
4930 uframe_periodic_max);
4937 * lock, so that our checking does not race with possible periodic
4938 * bandwidth allocation through submitting new urbs.
4940 spin_lock_irqsave(&fotg210->lock, flags);
4943 * for request to decrease max periodic bandwidth, we have to check
4944 * every microframe in the schedule to see whether the decrease is
4947 if (uframe_periodic_max < fotg210->uframe_periodic_max) {
4950 for (frame = 0; frame < fotg210->periodic_size; ++frame)
4951 for (uframe = 0; uframe < 7; ++uframe)
4952 allocated_max = max(allocated_max,
4953 periodic_usecs(fotg210, frame, uframe));
4955 if (allocated_max > uframe_periodic_max) {
4956 fotg210_info(fotg210,
4957 "cannot decrease uframe_periodic_max because "
4958 "periodic bandwidth is already allocated "
4960 allocated_max, uframe_periodic_max);
4965 /* increasing is always ok */
4967 fotg210_info(fotg210, "setting max periodic bandwidth to %u%% (== %u usec/uframe)\n",
4968 100 * uframe_periodic_max/125, uframe_periodic_max);
4970 if (uframe_periodic_max != 100)
4971 fotg210_warn(fotg210, "max periodic bandwidth set is non-standard\n");
4973 fotg210->uframe_periodic_max = uframe_periodic_max;
4977 spin_unlock_irqrestore(&fotg210->lock, flags);
4981 static DEVICE_ATTR(uframe_periodic_max, 0644, show_uframe_periodic_max,
4982 store_uframe_periodic_max);
4984 static inline int create_sysfs_files(struct fotg210_hcd *fotg210)
4986 struct device *controller = fotg210_to_hcd(fotg210)->self.controller;
4992 i = device_create_file(controller, &dev_attr_uframe_periodic_max);
4997 static inline void remove_sysfs_files(struct fotg210_hcd *fotg210)
4999 struct device *controller = fotg210_to_hcd(fotg210)->self.controller;
5001 device_remove_file(controller, &dev_attr_uframe_periodic_max);
5003 /*-------------------------------------------------------------------------*/
5005 /* On some systems, leaving remote wakeup enabled prevents system shutdown.
5006 * The firmware seems to think that powering off is a wakeup event!
5007 * This routine turns off remote wakeup and everything else, on all ports.
5009 static void fotg210_turn_off_all_ports(struct fotg210_hcd *fotg210)
5011 u32 __iomem *status_reg = &fotg210->regs->port_status;
5013 fotg210_writel(fotg210, PORT_RWC_BITS, status_reg);
5017 * Halt HC, turn off all ports, and let the BIOS use the companion controllers.
5018 * Must be called with interrupts enabled and the lock not held.
5020 static void fotg210_silence_controller(struct fotg210_hcd *fotg210)
5022 fotg210_halt(fotg210);
5024 spin_lock_irq(&fotg210->lock);
5025 fotg210->rh_state = FOTG210_RH_HALTED;
5026 fotg210_turn_off_all_ports(fotg210);
5027 spin_unlock_irq(&fotg210->lock);
5030 /* fotg210_shutdown kick in for silicon on any bus (not just pci, etc).
5031 * This forcibly disables dma and IRQs, helping kexec and other cases
5032 * where the next system software may expect clean state.
5034 static void fotg210_shutdown(struct usb_hcd *hcd)
5036 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5038 spin_lock_irq(&fotg210->lock);
5039 fotg210->shutdown = true;
5040 fotg210->rh_state = FOTG210_RH_STOPPING;
5041 fotg210->enabled_hrtimer_events = 0;
5042 spin_unlock_irq(&fotg210->lock);
5044 fotg210_silence_controller(fotg210);
5046 hrtimer_cancel(&fotg210->hrtimer);
5049 /*-------------------------------------------------------------------------*/
5052 * fotg210_work is called from some interrupts, timers, and so on.
5053 * it calls driver completion functions, after dropping fotg210->lock.
5055 static void fotg210_work(struct fotg210_hcd *fotg210)
5057 /* another CPU may drop fotg210->lock during a schedule scan while
5058 * it reports urb completions. this flag guards against bogus
5059 * attempts at re-entrant schedule scanning.
5061 if (fotg210->scanning) {
5062 fotg210->need_rescan = true;
5065 fotg210->scanning = true;
5068 fotg210->need_rescan = false;
5069 if (fotg210->async_count)
5070 scan_async(fotg210);
5071 if (fotg210->intr_count > 0)
5073 if (fotg210->isoc_count > 0)
5075 if (fotg210->need_rescan)
5077 fotg210->scanning = false;
5079 /* the IO watchdog guards against hardware or driver bugs that
5080 * misplace IRQs, and should let us run completely without IRQs.
5081 * such lossage has been observed on both VT6202 and VT8235.
5083 turn_on_io_watchdog(fotg210);
5087 * Called when the fotg210_hcd module is removed.
5089 static void fotg210_stop(struct usb_hcd *hcd)
5091 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5093 fotg210_dbg(fotg210, "stop\n");
5095 /* no more interrupts ... */
5097 spin_lock_irq(&fotg210->lock);
5098 fotg210->enabled_hrtimer_events = 0;
5099 spin_unlock_irq(&fotg210->lock);
5101 fotg210_quiesce(fotg210);
5102 fotg210_silence_controller(fotg210);
5103 fotg210_reset(fotg210);
5105 hrtimer_cancel(&fotg210->hrtimer);
5106 remove_sysfs_files(fotg210);
5107 remove_debug_files(fotg210);
5109 /* root hub is shut down separately (first, when possible) */
5110 spin_lock_irq(&fotg210->lock);
5111 end_free_itds(fotg210);
5112 spin_unlock_irq(&fotg210->lock);
5113 fotg210_mem_cleanup(fotg210);
5115 #ifdef FOTG210_STATS
5116 fotg210_dbg(fotg210, "irq normal %ld err %ld iaa %ld (lost %ld)\n",
5117 fotg210->stats.normal, fotg210->stats.error, fotg210->stats.iaa,
5118 fotg210->stats.lost_iaa);
5119 fotg210_dbg(fotg210, "complete %ld unlink %ld\n",
5120 fotg210->stats.complete, fotg210->stats.unlink);
5123 dbg_status(fotg210, "fotg210_stop completed",
5124 fotg210_readl(fotg210, &fotg210->regs->status));
5127 /* one-time init, only for memory state */
5128 static int hcd_fotg210_init(struct usb_hcd *hcd)
5130 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5134 struct fotg210_qh_hw *hw;
5136 spin_lock_init(&fotg210->lock);
5139 * keep io watchdog by default, those good HCDs could turn off it later
5141 fotg210->need_io_watchdog = 1;
5143 hrtimer_init(&fotg210->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
5144 fotg210->hrtimer.function = fotg210_hrtimer_func;
5145 fotg210->next_hrtimer_event = FOTG210_HRTIMER_NO_EVENT;
5147 hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
5150 * by default set standard 80% (== 100 usec/uframe) max periodic
5151 * bandwidth as required by USB 2.0
5153 fotg210->uframe_periodic_max = 100;
5156 * hw default: 1K periodic list heads, one per frame.
5157 * periodic_size can shrink by USBCMD update if hcc_params allows.
5159 fotg210->periodic_size = DEFAULT_I_TDPS;
5160 INIT_LIST_HEAD(&fotg210->intr_qh_list);
5161 INIT_LIST_HEAD(&fotg210->cached_itd_list);
5163 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5164 /* periodic schedule size can be smaller than default */
5165 switch (FOTG210_TUNE_FLS) {
5167 fotg210->periodic_size = 1024;
5170 fotg210->periodic_size = 512;
5173 fotg210->periodic_size = 256;
5179 retval = fotg210_mem_init(fotg210, GFP_KERNEL);
5183 /* controllers may cache some of the periodic schedule ... */
5184 fotg210->i_thresh = 2;
5187 * dedicate a qh for the async ring head, since we couldn't unlink
5188 * a 'real' qh without stopping the async schedule [4.8]. use it
5189 * as the 'reclamation list head' too.
5190 * its dummy is used in hw_alt_next of many tds, to prevent the qh
5191 * from automatically advancing to the next td after short reads.
5193 fotg210->async->qh_next.qh = NULL;
5194 hw = fotg210->async->hw;
5195 hw->hw_next = QH_NEXT(fotg210, fotg210->async->qh_dma);
5196 hw->hw_info1 = cpu_to_hc32(fotg210, QH_HEAD);
5197 hw->hw_token = cpu_to_hc32(fotg210, QTD_STS_HALT);
5198 hw->hw_qtd_next = FOTG210_LIST_END(fotg210);
5199 fotg210->async->qh_state = QH_STATE_LINKED;
5200 hw->hw_alt_next = QTD_NEXT(fotg210, fotg210->async->dummy->qtd_dma);
5202 /* clear interrupt enables, set irq latency */
5203 if (log2_irq_thresh < 0 || log2_irq_thresh > 6)
5204 log2_irq_thresh = 0;
5205 temp = 1 << (16 + log2_irq_thresh);
5206 if (HCC_CANPARK(hcc_params)) {
5207 /* HW default park == 3, on hardware that supports it (like
5208 * NVidia and ALI silicon), maximizes throughput on the async
5209 * schedule by avoiding QH fetches between transfers.
5211 * With fast usb storage devices and NForce2, "park" seems to
5212 * make problems: throughput reduction (!), data errors...
5215 park = min_t(unsigned, park, 3);
5219 fotg210_dbg(fotg210, "park %d\n", park);
5221 if (HCC_PGM_FRAMELISTLEN(hcc_params)) {
5222 /* periodic schedule size can be smaller than default */
5224 temp |= (FOTG210_TUNE_FLS << 2);
5226 fotg210->command = temp;
5228 /* Accept arbitrarily long scatter-gather lists */
5229 if (!(hcd->driver->flags & HCD_LOCAL_MEM))
5230 hcd->self.sg_tablesize = ~0;
5234 /* start HC running; it's halted, hcd_fotg210_init() has been run (once) */
5235 static int fotg210_run(struct usb_hcd *hcd)
5237 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5241 hcd->uses_new_polling = 1;
5243 /* EHCI spec section 4.1 */
5245 fotg210_writel(fotg210, fotg210->periodic_dma,
5246 &fotg210->regs->frame_list);
5247 fotg210_writel(fotg210, (u32)fotg210->async->qh_dma,
5248 &fotg210->regs->async_next);
5251 * hcc_params controls whether fotg210->regs->segment must (!!!)
5252 * be used; it constrains QH/ITD/SITD and QTD locations.
5253 * pci_pool consistent memory always uses segment zero.
5254 * streaming mappings for I/O buffers, like pci_map_single(),
5255 * can return segments above 4GB, if the device allows.
5257 * NOTE: the dma mask is visible through dma_supported(), so
5258 * drivers can pass this info along ... like NETIF_F_HIGHDMA,
5259 * Scsi_Host.highmem_io, and so forth. It's readonly to all
5260 * host side drivers though.
5262 hcc_params = fotg210_readl(fotg210, &fotg210->caps->hcc_params);
5265 * Philips, Intel, and maybe others need CMD_RUN before the
5266 * root hub will detect new devices (why?); NEC doesn't
5268 fotg210->command &= ~(CMD_IAAD|CMD_PSE|CMD_ASE|CMD_RESET);
5269 fotg210->command |= CMD_RUN;
5270 fotg210_writel(fotg210, fotg210->command, &fotg210->regs->command);
5271 dbg_cmd(fotg210, "init", fotg210->command);
5274 * Start, enabling full USB 2.0 functionality ... usb 1.1 devices
5275 * are explicitly handed to companion controller(s), so no TT is
5276 * involved with the root hub. (Except where one is integrated,
5277 * and there's no companion controller unless maybe for USB OTG.)
5279 * Turning on the CF flag will transfer ownership of all ports
5280 * from the companions to the EHCI controller. If any of the
5281 * companions are in the middle of a port reset at the time, it
5282 * could cause trouble. Write-locking ehci_cf_port_reset_rwsem
5283 * guarantees that no resets are in progress. After we set CF,
5284 * a short delay lets the hardware catch up; new resets shouldn't
5285 * be started before the port switching actions could complete.
5287 down_write(&ehci_cf_port_reset_rwsem);
5288 fotg210->rh_state = FOTG210_RH_RUNNING;
5289 /* unblock posted writes */
5290 fotg210_readl(fotg210, &fotg210->regs->command);
5292 up_write(&ehci_cf_port_reset_rwsem);
5293 fotg210->last_periodic_enable = ktime_get_real();
5295 temp = HC_VERSION(fotg210,
5296 fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
5297 fotg210_info(fotg210,
5298 "USB %x.%x started, EHCI %x.%02x\n",
5299 ((fotg210->sbrn & 0xf0)>>4), (fotg210->sbrn & 0x0f),
5300 temp >> 8, temp & 0xff);
5302 fotg210_writel(fotg210, INTR_MASK,
5303 &fotg210->regs->intr_enable); /* Turn On Interrupts */
5305 /* GRR this is run-once init(), being done every time the HC starts.
5306 * So long as they're part of class devices, we can't do it init()
5307 * since the class device isn't created that early.
5309 create_debug_files(fotg210);
5310 create_sysfs_files(fotg210);
5315 static int fotg210_setup(struct usb_hcd *hcd)
5317 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5320 fotg210->regs = (void __iomem *)fotg210->caps +
5322 fotg210_readl(fotg210, &fotg210->caps->hc_capbase));
5323 dbg_hcs_params(fotg210, "reset");
5324 dbg_hcc_params(fotg210, "reset");
5326 /* cache this readonly data; minimize chip reads */
5327 fotg210->hcs_params = fotg210_readl(fotg210,
5328 &fotg210->caps->hcs_params);
5330 fotg210->sbrn = HCD_USB2;
5332 /* data structure init */
5333 retval = hcd_fotg210_init(hcd);
5337 retval = fotg210_halt(fotg210);
5341 fotg210_reset(fotg210);
5346 /*-------------------------------------------------------------------------*/
5348 static irqreturn_t fotg210_irq(struct usb_hcd *hcd)
5350 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5351 u32 status, masked_status, pcd_status = 0, cmd;
5354 spin_lock(&fotg210->lock);
5356 status = fotg210_readl(fotg210, &fotg210->regs->status);
5358 /* e.g. cardbus physical eject */
5359 if (status == ~(u32) 0) {
5360 fotg210_dbg(fotg210, "device removed\n");
5365 * We don't use STS_FLR, but some controllers don't like it to
5366 * remain on, so mask it out along with the other status bits.
5368 masked_status = status & (INTR_MASK | STS_FLR);
5371 if (!masked_status ||
5372 unlikely(fotg210->rh_state == FOTG210_RH_HALTED)) {
5373 spin_unlock(&fotg210->lock);
5377 /* clear (just) interrupts */
5378 fotg210_writel(fotg210, masked_status, &fotg210->regs->status);
5379 cmd = fotg210_readl(fotg210, &fotg210->regs->command);
5382 /* unrequested/ignored: Frame List Rollover */
5383 dbg_status(fotg210, "irq", status);
5385 /* INT, ERR, and IAA interrupt rates can be throttled */
5387 /* normal [4.15.1.2] or error [4.15.1.1] completion */
5388 if (likely((status & (STS_INT|STS_ERR)) != 0)) {
5389 if (likely((status & STS_ERR) == 0))
5390 COUNT(fotg210->stats.normal);
5392 COUNT(fotg210->stats.error);
5396 /* complete the unlinking of some qh [4.15.2.3] */
5397 if (status & STS_IAA) {
5399 /* Turn off the IAA watchdog */
5400 fotg210->enabled_hrtimer_events &=
5401 ~BIT(FOTG210_HRTIMER_IAA_WATCHDOG);
5404 * Mild optimization: Allow another IAAD to reset the
5405 * hrtimer, if one occurs before the next expiration.
5406 * In theory we could always cancel the hrtimer, but
5407 * tests show that about half the time it will be reset
5408 * for some other event anyway.
5410 if (fotg210->next_hrtimer_event == FOTG210_HRTIMER_IAA_WATCHDOG)
5411 ++fotg210->next_hrtimer_event;
5413 /* guard against (alleged) silicon errata */
5415 fotg210_dbg(fotg210, "IAA with IAAD still set?\n");
5416 if (fotg210->async_iaa) {
5417 COUNT(fotg210->stats.iaa);
5418 end_unlink_async(fotg210);
5420 fotg210_dbg(fotg210, "IAA with nothing unlinked?\n");
5423 /* remote wakeup [4.3.1] */
5424 if (status & STS_PCD) {
5426 u32 __iomem *status_reg = &fotg210->regs->port_status;
5428 /* kick root hub later */
5429 pcd_status = status;
5431 /* resume root hub? */
5432 if (fotg210->rh_state == FOTG210_RH_SUSPENDED)
5433 usb_hcd_resume_root_hub(hcd);
5435 pstatus = fotg210_readl(fotg210, status_reg);
5437 if (test_bit(0, &fotg210->suspended_ports) &&
5438 ((pstatus & PORT_RESUME) ||
5439 !(pstatus & PORT_SUSPEND)) &&
5440 (pstatus & PORT_PE) &&
5441 fotg210->reset_done[0] == 0) {
5443 /* start 20 msec resume signaling from this port,
5444 * and make hub_wq collect PORT_STAT_C_SUSPEND to
5445 * stop that signaling. Use 5 ms extra for safety,
5446 * like usb_port_resume() does.
5448 fotg210->reset_done[0] = jiffies + msecs_to_jiffies(25);
5449 set_bit(0, &fotg210->resuming_ports);
5450 fotg210_dbg(fotg210, "port 1 remote wakeup\n");
5451 mod_timer(&hcd->rh_timer, fotg210->reset_done[0]);
5455 /* PCI errors [4.15.2.4] */
5456 if (unlikely((status & STS_FATAL) != 0)) {
5457 fotg210_err(fotg210, "fatal error\n");
5458 dbg_cmd(fotg210, "fatal", cmd);
5459 dbg_status(fotg210, "fatal", status);
5463 /* Don't let the controller do anything more */
5464 fotg210->shutdown = true;
5465 fotg210->rh_state = FOTG210_RH_STOPPING;
5466 fotg210->command &= ~(CMD_RUN | CMD_ASE | CMD_PSE);
5467 fotg210_writel(fotg210, fotg210->command,
5468 &fotg210->regs->command);
5469 fotg210_writel(fotg210, 0, &fotg210->regs->intr_enable);
5470 fotg210_handle_controller_death(fotg210);
5472 /* Handle completions when the controller stops */
5477 fotg210_work(fotg210);
5478 spin_unlock(&fotg210->lock);
5480 usb_hcd_poll_rh_status(hcd);
5484 /*-------------------------------------------------------------------------*/
5487 * non-error returns are a promise to giveback() the urb later
5488 * we drop ownership so next owner (or urb unlink) can get it
5490 * urb + dev is in hcd.self.controller.urb_list
5491 * we're queueing TDs onto software and hardware lists
5493 * hcd-specific init for hcpriv hasn't been done yet
5495 * NOTE: control, bulk, and interrupt share the same code to append TDs
5496 * to a (possibly active) QH, and the same QH scanning code.
5498 static int fotg210_urb_enqueue(
5499 struct usb_hcd *hcd,
5503 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5504 struct list_head qtd_list;
5506 INIT_LIST_HEAD(&qtd_list);
5508 switch (usb_pipetype(urb->pipe)) {
5510 /* qh_completions() code doesn't handle all the fault cases
5511 * in multi-TD control transfers. Even 1KB is rare anyway.
5513 if (urb->transfer_buffer_length > (16 * 1024))
5516 /* case PIPE_BULK: */
5518 if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
5520 return submit_async(fotg210, urb, &qtd_list, mem_flags);
5522 case PIPE_INTERRUPT:
5523 if (!qh_urb_transaction(fotg210, urb, &qtd_list, mem_flags))
5525 return intr_submit(fotg210, urb, &qtd_list, mem_flags);
5527 case PIPE_ISOCHRONOUS:
5528 return itd_submit(fotg210, urb, mem_flags);
5532 /* remove from hardware lists
5533 * completions normally happen asynchronously
5536 static int fotg210_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
5538 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5539 struct fotg210_qh *qh;
5540 unsigned long flags;
5543 spin_lock_irqsave(&fotg210->lock, flags);
5544 rc = usb_hcd_check_unlink_urb(hcd, urb, status);
5548 switch (usb_pipetype(urb->pipe)) {
5549 /* case PIPE_CONTROL: */
5550 /* case PIPE_BULK:*/
5552 qh = (struct fotg210_qh *) urb->hcpriv;
5555 switch (qh->qh_state) {
5556 case QH_STATE_LINKED:
5557 case QH_STATE_COMPLETING:
5558 start_unlink_async(fotg210, qh);
5560 case QH_STATE_UNLINK:
5561 case QH_STATE_UNLINK_WAIT:
5562 /* already started */
5565 /* QH might be waiting for a Clear-TT-Buffer */
5566 qh_completions(fotg210, qh);
5571 case PIPE_INTERRUPT:
5572 qh = (struct fotg210_qh *) urb->hcpriv;
5575 switch (qh->qh_state) {
5576 case QH_STATE_LINKED:
5577 case QH_STATE_COMPLETING:
5578 start_unlink_intr(fotg210, qh);
5581 qh_completions(fotg210, qh);
5584 fotg210_dbg(fotg210, "bogus qh %p state %d\n",
5590 case PIPE_ISOCHRONOUS:
5593 /* wait till next completion, do it then. */
5594 /* completion irqs can wait up to 1024 msec, */
5598 spin_unlock_irqrestore(&fotg210->lock, flags);
5602 /*-------------------------------------------------------------------------*/
5604 /* bulk qh holds the data toggle */
5607 fotg210_endpoint_disable(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5609 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5610 unsigned long flags;
5611 struct fotg210_qh *qh, *tmp;
5613 /* ASSERT: any requests/urbs are being unlinked */
5614 /* ASSERT: nobody can be submitting urbs for this any more */
5617 spin_lock_irqsave(&fotg210->lock, flags);
5622 /* endpoints can be iso streams. for now, we don't
5623 * accelerate iso completions ... so spin a while.
5625 if (qh->hw == NULL) {
5626 struct fotg210_iso_stream *stream = ep->hcpriv;
5628 if (!list_empty(&stream->td_list))
5631 /* BUG_ON(!list_empty(&stream->free_list)); */
5636 if (fotg210->rh_state < FOTG210_RH_RUNNING)
5637 qh->qh_state = QH_STATE_IDLE;
5638 switch (qh->qh_state) {
5639 case QH_STATE_LINKED:
5640 case QH_STATE_COMPLETING:
5641 for (tmp = fotg210->async->qh_next.qh;
5643 tmp = tmp->qh_next.qh)
5645 /* periodic qh self-unlinks on empty, and a COMPLETING qh
5646 * may already be unlinked.
5649 start_unlink_async(fotg210, qh);
5651 case QH_STATE_UNLINK: /* wait for hw to finish? */
5652 case QH_STATE_UNLINK_WAIT:
5654 spin_unlock_irqrestore(&fotg210->lock, flags);
5655 schedule_timeout_uninterruptible(1);
5657 case QH_STATE_IDLE: /* fully unlinked */
5658 if (qh->clearing_tt)
5660 if (list_empty(&qh->qtd_list)) {
5661 qh_destroy(fotg210, qh);
5664 /* else FALL THROUGH */
5666 /* caller was supposed to have unlinked any requests;
5667 * that's not our job. just leak this memory.
5669 fotg210_err(fotg210, "qh %p (#%02x) state %d%s\n",
5670 qh, ep->desc.bEndpointAddress, qh->qh_state,
5671 list_empty(&qh->qtd_list) ? "" : "(has tds)");
5676 spin_unlock_irqrestore(&fotg210->lock, flags);
5680 fotg210_endpoint_reset(struct usb_hcd *hcd, struct usb_host_endpoint *ep)
5682 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5683 struct fotg210_qh *qh;
5684 int eptype = usb_endpoint_type(&ep->desc);
5685 int epnum = usb_endpoint_num(&ep->desc);
5686 int is_out = usb_endpoint_dir_out(&ep->desc);
5687 unsigned long flags;
5689 if (eptype != USB_ENDPOINT_XFER_BULK && eptype != USB_ENDPOINT_XFER_INT)
5692 spin_lock_irqsave(&fotg210->lock, flags);
5695 /* For Bulk and Interrupt endpoints we maintain the toggle state
5696 * in the hardware; the toggle bits in udev aren't used at all.
5697 * When an endpoint is reset by usb_clear_halt() we must reset
5698 * the toggle bit in the QH.
5701 usb_settoggle(qh->dev, epnum, is_out, 0);
5702 if (!list_empty(&qh->qtd_list)) {
5703 WARN_ONCE(1, "clear_halt for a busy endpoint\n");
5704 } else if (qh->qh_state == QH_STATE_LINKED ||
5705 qh->qh_state == QH_STATE_COMPLETING) {
5707 /* The toggle value in the QH can't be updated
5708 * while the QH is active. Unlink it now;
5709 * re-linking will call qh_refresh().
5711 if (eptype == USB_ENDPOINT_XFER_BULK)
5712 start_unlink_async(fotg210, qh);
5714 start_unlink_intr(fotg210, qh);
5717 spin_unlock_irqrestore(&fotg210->lock, flags);
5720 static int fotg210_get_frame(struct usb_hcd *hcd)
5722 struct fotg210_hcd *fotg210 = hcd_to_fotg210(hcd);
5723 return (fotg210_read_frame_index(fotg210) >> 3) %
5724 fotg210->periodic_size;
5727 /*-------------------------------------------------------------------------*/
5730 * The EHCI in ChipIdea HDRC cannot be a separate module or device,
5731 * because its registers (and irq) are shared between host/gadget/otg
5732 * functions and in order to facilitate role switching we cannot
5733 * give the fotg210 driver exclusive access to those.
5735 MODULE_DESCRIPTION(DRIVER_DESC);
5736 MODULE_AUTHOR(DRIVER_AUTHOR);
5737 MODULE_LICENSE("GPL");
5739 static const struct hc_driver fotg210_fotg210_hc_driver = {
5740 .description = hcd_name,
5741 .product_desc = "Faraday USB2.0 Host Controller",
5742 .hcd_priv_size = sizeof(struct fotg210_hcd),
5745 * generic hardware linkage
5748 .flags = HCD_MEMORY | HCD_USB2,
5751 * basic lifecycle operations
5753 .reset = hcd_fotg210_init,
5754 .start = fotg210_run,
5755 .stop = fotg210_stop,
5756 .shutdown = fotg210_shutdown,
5759 * managing i/o requests and associated device resources
5761 .urb_enqueue = fotg210_urb_enqueue,
5762 .urb_dequeue = fotg210_urb_dequeue,
5763 .endpoint_disable = fotg210_endpoint_disable,
5764 .endpoint_reset = fotg210_endpoint_reset,
5767 * scheduling support
5769 .get_frame_number = fotg210_get_frame,
5774 .hub_status_data = fotg210_hub_status_data,
5775 .hub_control = fotg210_hub_control,
5776 .bus_suspend = fotg210_bus_suspend,
5777 .bus_resume = fotg210_bus_resume,
5779 .relinquish_port = fotg210_relinquish_port,
5780 .port_handed_over = fotg210_port_handed_over,
5782 .clear_tt_buffer_complete = fotg210_clear_tt_buffer_complete,
5785 static void fotg210_init(struct fotg210_hcd *fotg210)
5789 iowrite32(GMIR_MDEV_INT | GMIR_MOTG_INT | GMIR_INT_POLARITY,
5790 &fotg210->regs->gmir);
5792 value = ioread32(&fotg210->regs->otgcsr);
5793 value &= ~OTGCSR_A_BUS_DROP;
5794 value |= OTGCSR_A_BUS_REQ;
5795 iowrite32(value, &fotg210->regs->otgcsr);
5799 * fotg210_hcd_probe - initialize faraday FOTG210 HCDs
5801 * Allocates basic resources for this USB host controller, and
5802 * then invokes the start() method for the HCD associated with it
5803 * through the hotplug entry's driver_data.
5805 static int fotg210_hcd_probe(struct platform_device *pdev)
5807 struct device *dev = &pdev->dev;
5808 struct usb_hcd *hcd;
5809 struct resource *res;
5811 int retval = -ENODEV;
5812 struct fotg210_hcd *fotg210;
5817 pdev->dev.power.power_state = PMSG_ON;
5819 res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
5822 "Found HC with no IRQ. Check %s setup!\n",
5829 hcd = usb_create_hcd(&fotg210_fotg210_hc_driver, dev,
5832 dev_err(dev, "failed to create hcd with err %d\n", retval);
5834 goto fail_create_hcd;
5839 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
5840 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
5841 if (IS_ERR(hcd->regs)) {
5842 retval = PTR_ERR(hcd->regs);
5846 hcd->rsrc_start = res->start;
5847 hcd->rsrc_len = resource_size(res);
5849 fotg210 = hcd_to_fotg210(hcd);
5851 fotg210->caps = hcd->regs;
5853 retval = fotg210_setup(hcd);
5857 fotg210_init(fotg210);
5859 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
5861 dev_err(dev, "failed to add hcd with err %d\n", retval);
5864 device_wakeup_enable(hcd->self.controller);
5871 dev_err(dev, "init %s fail, %d\n", dev_name(dev), retval);
5876 * fotg210_hcd_remove - shutdown processing for EHCI HCDs
5877 * @dev: USB Host Controller being removed
5880 static int fotg210_hcd_remove(struct platform_device *pdev)
5882 struct device *dev = &pdev->dev;
5883 struct usb_hcd *hcd = dev_get_drvdata(dev);
5888 usb_remove_hcd(hcd);
5894 static struct platform_driver fotg210_hcd_driver = {
5896 .name = "fotg210-hcd",
5898 .probe = fotg210_hcd_probe,
5899 .remove = fotg210_hcd_remove,
5902 static int __init fotg210_hcd_init(void)
5909 pr_info("%s: " DRIVER_DESC "\n", hcd_name);
5910 set_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5911 if (test_bit(USB_UHCI_LOADED, &usb_hcds_loaded) ||
5912 test_bit(USB_OHCI_LOADED, &usb_hcds_loaded))
5913 pr_warn(KERN_WARNING "Warning! fotg210_hcd should always be loaded before uhci_hcd and ohci_hcd, not after\n");
5915 pr_debug("%s: block sizes: qh %Zd qtd %Zd itd %Zd\n",
5917 sizeof(struct fotg210_qh), sizeof(struct fotg210_qtd),
5918 sizeof(struct fotg210_itd));
5920 fotg210_debug_root = debugfs_create_dir("fotg210", usb_debug_root);
5921 if (!fotg210_debug_root) {
5926 retval = platform_driver_register(&fotg210_hcd_driver);
5932 debugfs_remove(fotg210_debug_root);
5933 fotg210_debug_root = NULL;
5935 clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5938 module_init(fotg210_hcd_init);
5940 static void __exit fotg210_hcd_cleanup(void)
5942 platform_driver_unregister(&fotg210_hcd_driver);
5943 debugfs_remove(fotg210_debug_root);
5944 clear_bit(USB_EHCI_LOADED, &usb_hcds_loaded);
5946 module_exit(fotg210_hcd_cleanup);