2 * Driver for the PLX NET2280 USB device controller.
3 * Specs and errata are available from <http://www.plxtech.com>.
5 * PLX Technology Inc. (formerly NetChip Technology) supported the
6 * development of this driver.
9 * CODE STATUS HIGHLIGHTS
11 * This driver should work well with most "gadget" drivers, including
12 * the Mass Storage, Serial, and Ethernet/RNDIS gadget drivers
13 * as well as Gadget Zero and Gadgetfs.
15 * DMA is enabled by default.
17 * MSI is enabled by default. The legacy IRQ is used if MSI couldn't
20 * Note that almost all the errata workarounds here are only needed for
21 * rev1 chips. Rev1a silicon (0110) fixes almost all of them.
25 * Copyright (C) 2003 David Brownell
26 * Copyright (C) 2003-2005 PLX Technology, Inc.
27 * Copyright (C) 2014 Ricardo Ribalda - Qtechnology/AS
29 * Modified Seth Levy 2005 PLX Technology, Inc. to provide compatibility
32 * Modified Ricardo Ribalda Qtechnology AS to provide compatibility
33 * with usb 338x chip. Based on PLX driver
35 * This program is free software; you can redistribute it and/or modify
36 * it under the terms of the GNU General Public License as published by
37 * the Free Software Foundation; either version 2 of the License, or
38 * (at your option) any later version.
41 #include <linux/module.h>
42 #include <linux/pci.h>
43 #include <linux/dma-mapping.h>
44 #include <linux/kernel.h>
45 #include <linux/delay.h>
46 #include <linux/ioport.h>
47 #include <linux/slab.h>
48 #include <linux/errno.h>
49 #include <linux/init.h>
50 #include <linux/timer.h>
51 #include <linux/list.h>
52 #include <linux/interrupt.h>
53 #include <linux/moduleparam.h>
54 #include <linux/device.h>
55 #include <linux/usb/ch9.h>
56 #include <linux/usb/gadget.h>
57 #include <linux/prefetch.h>
60 #include <asm/byteorder.h>
62 #include <asm/unaligned.h>
64 #define DRIVER_DESC "PLX NET228x/USB338x USB Peripheral Controller"
65 #define DRIVER_VERSION "2005 Sept 27/v3.0"
67 #define EP_DONTUSE 13 /* nonzero */
69 #define USE_RDK_LEDS /* GPIO pins control three LEDs */
72 static const char driver_name[] = "net2280";
73 static const char driver_desc[] = DRIVER_DESC;
75 static const u32 ep_bit[9] = { 0, 17, 2, 19, 4, 1, 18, 3, 20 };
76 static const char ep0name[] = "ep0";
77 static const char *const ep_name[] = {
79 "ep-a", "ep-b", "ep-c", "ep-d",
80 "ep-e", "ep-f", "ep-g", "ep-h",
83 /* Endpoint names for usb3380 advance mode */
84 static const char *const ep_name_adv[] = {
86 "ep1in", "ep2out", "ep3in", "ep4out",
87 "ep1out", "ep2in", "ep3out", "ep4in",
90 /* mode 0 == ep-{a,b,c,d} 1K fifo each
91 * mode 1 == ep-{a,b} 2K fifo each, ep-{c,d} unavailable
92 * mode 2 == ep-a 2K fifo, ep-{b,c} 1K each, ep-d unavailable
94 static ushort fifo_mode;
96 /* "modprobe net2280 fifo_mode=1" etc */
97 module_param(fifo_mode, ushort, 0644);
99 /* enable_suspend -- When enabled, the driver will respond to
100 * USB suspend requests by powering down the NET2280. Otherwise,
101 * USB suspend requests will be ignored. This is acceptable for
102 * self-powered devices
104 static bool enable_suspend;
106 /* "modprobe net2280 enable_suspend=1" etc */
107 module_param(enable_suspend, bool, 0444);
109 #define DIR_STRING(bAddress) (((bAddress) & USB_DIR_IN) ? "in" : "out")
111 static char *type_string(u8 bmAttributes)
113 switch ((bmAttributes) & USB_ENDPOINT_XFERTYPE_MASK) {
114 case USB_ENDPOINT_XFER_BULK: return "bulk";
115 case USB_ENDPOINT_XFER_ISOC: return "iso";
116 case USB_ENDPOINT_XFER_INT: return "intr";
123 #define valid_bit cpu_to_le32(BIT(VALID_BIT))
124 #define dma_done_ie cpu_to_le32(BIT(DMA_DONE_INTERRUPT_ENABLE))
126 static void ep_clear_seqnum(struct net2280_ep *ep);
128 /*-------------------------------------------------------------------------*/
129 static inline void enable_pciirqenb(struct net2280_ep *ep)
131 u32 tmp = readl(&ep->dev->regs->pciirqenb0);
133 if (ep->dev->quirks & PLX_LEGACY)
136 tmp |= BIT(ep_bit[ep->num]);
137 writel(tmp, &ep->dev->regs->pciirqenb0);
143 net2280_enable(struct usb_ep *_ep, const struct usb_endpoint_descriptor *desc)
146 struct net2280_ep *ep;
151 static const u32 ep_key[9] = { 1, 0, 1, 0, 1, 1, 0, 1, 0 };
154 ep = container_of(_ep, struct net2280_ep, ep);
155 if (!_ep || !desc || ep->desc || _ep->name == ep0name ||
156 desc->bDescriptorType != USB_DT_ENDPOINT) {
157 pr_err("%s: failed at line=%d\n", __func__, __LINE__);
161 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
166 /* erratum 0119 workaround ties up an endpoint number */
167 if ((desc->bEndpointAddress & 0x0f) == EP_DONTUSE) {
172 if (dev->quirks & PLX_SUPERSPEED) {
173 if ((desc->bEndpointAddress & 0x0f) >= 0x0c) {
177 ep->is_in = !!usb_endpoint_dir_in(desc);
178 if (dev->enhanced_mode && ep->is_in && ep_key[ep->num]) {
184 /* sanity check ep-e/ep-f since their fifos are small */
185 max = usb_endpoint_maxp(desc) & 0x1fff;
186 if (ep->num > 4 && max > 64 && (dev->quirks & PLX_LEGACY)) {
191 spin_lock_irqsave(&dev->lock, flags);
192 _ep->maxpacket = max & 0x7ff;
195 /* ep_reset() has already been called */
198 ep->out_overflow = 0;
200 /* set speed-dependent max packet; may kick in high bandwidth */
201 set_max_speed(ep, max);
203 /* set type, direction, address; reset fifo counters */
204 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
206 if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
207 tmp = readl(&ep->cfg->ep_cfg);
208 /* If USB ep number doesn't match hardware ep number */
209 if ((tmp & 0xf) != usb_endpoint_num(desc)) {
211 spin_unlock_irqrestore(&dev->lock, flags);
215 tmp &= ~USB3380_EP_CFG_MASK_IN;
217 tmp &= ~USB3380_EP_CFG_MASK_OUT;
219 type = (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK);
220 if (type == USB_ENDPOINT_XFER_INT) {
221 /* erratum 0105 workaround prevents hs NYET */
222 if (dev->chiprev == 0100 &&
223 dev->gadget.speed == USB_SPEED_HIGH &&
224 !(desc->bEndpointAddress & USB_DIR_IN))
225 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE),
227 } else if (type == USB_ENDPOINT_XFER_BULK) {
228 /* catch some particularly blatant driver bugs */
229 if ((dev->gadget.speed == USB_SPEED_SUPER && max != 1024) ||
230 (dev->gadget.speed == USB_SPEED_HIGH && max != 512) ||
231 (dev->gadget.speed == USB_SPEED_FULL && max > 64)) {
232 spin_unlock_irqrestore(&dev->lock, flags);
237 ep->is_iso = (type == USB_ENDPOINT_XFER_ISOC);
238 /* Enable this endpoint */
239 if (dev->quirks & PLX_LEGACY) {
240 tmp |= type << ENDPOINT_TYPE;
241 tmp |= desc->bEndpointAddress;
242 /* default full fifo lines */
243 tmp |= (4 << ENDPOINT_BYTE_COUNT);
244 tmp |= BIT(ENDPOINT_ENABLE);
245 ep->is_in = (tmp & USB_DIR_IN) != 0;
247 /* In Legacy mode, only OUT endpoints are used */
248 if (dev->enhanced_mode && ep->is_in) {
249 tmp |= type << IN_ENDPOINT_TYPE;
250 tmp |= BIT(IN_ENDPOINT_ENABLE);
252 tmp |= type << OUT_ENDPOINT_TYPE;
253 tmp |= BIT(OUT_ENDPOINT_ENABLE);
254 tmp |= (ep->is_in << ENDPOINT_DIRECTION);
257 tmp |= (4 << ENDPOINT_BYTE_COUNT);
258 if (!dev->enhanced_mode)
259 tmp |= usb_endpoint_num(desc);
260 tmp |= (ep->ep.maxburst << MAX_BURST_SIZE);
263 /* Make sure all the registers are written before ep_rsp*/
266 /* for OUT transfers, block the rx fifo until a read is posted */
268 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
269 else if (!(dev->quirks & PLX_2280)) {
270 /* Added for 2282, Don't use nak packets on an in endpoint,
271 * this was ignored on 2280
273 writel(BIT(CLEAR_NAK_OUT_PACKETS) |
274 BIT(CLEAR_NAK_OUT_PACKETS_MODE), &ep->regs->ep_rsp);
277 if (dev->quirks & PLX_SUPERSPEED)
279 writel(tmp, &ep->cfg->ep_cfg);
282 if (!ep->dma) { /* pio, per-packet */
283 enable_pciirqenb(ep);
285 tmp = BIT(DATA_PACKET_RECEIVED_INTERRUPT_ENABLE) |
286 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT_ENABLE);
287 if (dev->quirks & PLX_2280)
288 tmp |= readl(&ep->regs->ep_irqenb);
289 writel(tmp, &ep->regs->ep_irqenb);
290 } else { /* dma, per-request */
291 tmp = BIT((8 + ep->num)); /* completion */
292 tmp |= readl(&dev->regs->pciirqenb1);
293 writel(tmp, &dev->regs->pciirqenb1);
295 /* for short OUT transfers, dma completions can't
296 * advance the queue; do it pio-style, by hand.
297 * NOTE erratum 0112 workaround #2
299 if ((desc->bEndpointAddress & USB_DIR_IN) == 0) {
300 tmp = BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT_ENABLE);
301 writel(tmp, &ep->regs->ep_irqenb);
303 enable_pciirqenb(ep);
307 tmp = desc->bEndpointAddress;
308 ep_dbg(dev, "enabled %s (ep%d%s-%s) %s max %04x\n",
309 _ep->name, tmp & 0x0f, DIR_STRING(tmp),
310 type_string(desc->bmAttributes),
311 ep->dma ? "dma" : "pio", max);
313 /* pci writes may still be posted */
314 spin_unlock_irqrestore(&dev->lock, flags);
318 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
322 static int handshake(u32 __iomem *ptr, u32 mask, u32 done, int usec)
328 if (result == ~(u32)0) /* "device unplugged" */
339 static const struct usb_ep_ops net2280_ep_ops;
341 static void ep_reset_228x(struct net2280_regs __iomem *regs,
342 struct net2280_ep *ep)
347 INIT_LIST_HEAD(&ep->queue);
349 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
350 ep->ep.ops = &net2280_ep_ops;
352 /* disable the dma, irqs, endpoint... */
354 writel(0, &ep->dma->dmactl);
355 writel(BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
356 BIT(DMA_TRANSACTION_DONE_INTERRUPT) |
360 tmp = readl(®s->pciirqenb0);
361 tmp &= ~BIT(ep->num);
362 writel(tmp, ®s->pciirqenb0);
364 tmp = readl(®s->pciirqenb1);
365 tmp &= ~BIT((8 + ep->num)); /* completion */
366 writel(tmp, ®s->pciirqenb1);
368 writel(0, &ep->regs->ep_irqenb);
370 /* init to our chosen defaults, notably so that we NAK OUT
371 * packets until the driver queues a read (+note erratum 0112)
373 if (!ep->is_in || (ep->dev->quirks & PLX_2280)) {
374 tmp = BIT(SET_NAK_OUT_PACKETS_MODE) |
375 BIT(SET_NAK_OUT_PACKETS) |
376 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
377 BIT(CLEAR_INTERRUPT_MODE);
380 tmp = BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
381 BIT(CLEAR_NAK_OUT_PACKETS) |
382 BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
383 BIT(CLEAR_INTERRUPT_MODE);
387 tmp |= BIT(CLEAR_ENDPOINT_TOGGLE) |
388 BIT(CLEAR_ENDPOINT_HALT);
390 writel(tmp, &ep->regs->ep_rsp);
392 /* scrub most status bits, and flush any fifo state */
393 if (ep->dev->quirks & PLX_2280)
394 tmp = BIT(FIFO_OVERFLOW) |
399 writel(tmp | BIT(TIMEOUT) |
400 BIT(USB_STALL_SENT) |
401 BIT(USB_IN_NAK_SENT) |
402 BIT(USB_IN_ACK_RCVD) |
403 BIT(USB_OUT_PING_NAK_SENT) |
404 BIT(USB_OUT_ACK_SENT) |
406 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
407 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
408 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
409 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
410 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
411 BIT(DATA_IN_TOKEN_INTERRUPT),
414 /* fifo size is handled separately */
417 static void ep_reset_338x(struct net2280_regs __iomem *regs,
418 struct net2280_ep *ep)
423 INIT_LIST_HEAD(&ep->queue);
425 usb_ep_set_maxpacket_limit(&ep->ep, ~0);
426 ep->ep.ops = &net2280_ep_ops;
428 /* disable the dma, irqs, endpoint... */
430 writel(0, &ep->dma->dmactl);
431 writel(BIT(DMA_ABORT_DONE_INTERRUPT) |
432 BIT(DMA_PAUSE_DONE_INTERRUPT) |
433 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
434 BIT(DMA_TRANSACTION_DONE_INTERRUPT),
435 /* | BIT(DMA_ABORT), */
438 dmastat = readl(&ep->dma->dmastat);
439 if (dmastat == 0x5002) {
440 ep_warn(ep->dev, "The dmastat return = %x!!\n",
442 writel(0x5a, &ep->dma->dmastat);
445 tmp = readl(®s->pciirqenb0);
446 tmp &= ~BIT(ep_bit[ep->num]);
447 writel(tmp, ®s->pciirqenb0);
450 tmp = readl(®s->pciirqenb1);
451 tmp &= ~BIT((8 + ep->num)); /* completion */
452 writel(tmp, ®s->pciirqenb1);
455 writel(0, &ep->regs->ep_irqenb);
457 writel(BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
458 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
460 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
461 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
462 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
463 BIT(DATA_IN_TOKEN_INTERRUPT), &ep->regs->ep_stat);
465 tmp = readl(&ep->cfg->ep_cfg);
467 tmp &= ~USB3380_EP_CFG_MASK_IN;
469 tmp &= ~USB3380_EP_CFG_MASK_OUT;
470 writel(tmp, &ep->cfg->ep_cfg);
473 static void nuke(struct net2280_ep *);
475 static int net2280_disable(struct usb_ep *_ep)
477 struct net2280_ep *ep;
480 ep = container_of(_ep, struct net2280_ep, ep);
481 if (!_ep || !ep->desc || _ep->name == ep0name) {
482 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
485 spin_lock_irqsave(&ep->dev->lock, flags);
488 if (ep->dev->quirks & PLX_SUPERSPEED)
489 ep_reset_338x(ep->dev->regs, ep);
491 ep_reset_228x(ep->dev->regs, ep);
493 ep_vdbg(ep->dev, "disabled %s %s\n",
494 ep->dma ? "dma" : "pio", _ep->name);
496 /* synch memory views with the device */
497 (void)readl(&ep->cfg->ep_cfg);
499 if (!ep->dma && ep->num >= 1 && ep->num <= 4)
500 ep->dma = &ep->dev->dma[ep->num - 1];
502 spin_unlock_irqrestore(&ep->dev->lock, flags);
506 /*-------------------------------------------------------------------------*/
508 static struct usb_request
509 *net2280_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
511 struct net2280_ep *ep;
512 struct net2280_request *req;
515 pr_err("%s: Invalid ep\n", __func__);
518 ep = container_of(_ep, struct net2280_ep, ep);
520 req = kzalloc(sizeof(*req), gfp_flags);
524 INIT_LIST_HEAD(&req->queue);
526 /* this dma descriptor may be swapped with the previous dummy */
528 struct net2280_dma *td;
530 td = pci_pool_alloc(ep->dev->requests, gfp_flags,
536 td->dmacount = 0; /* not VALID */
537 td->dmadesc = td->dmaaddr;
543 static void net2280_free_request(struct usb_ep *_ep, struct usb_request *_req)
545 struct net2280_ep *ep;
546 struct net2280_request *req;
548 ep = container_of(_ep, struct net2280_ep, ep);
550 dev_err(&ep->dev->pdev->dev, "%s: Inavlid ep=%p or req=%p\n",
551 __func__, _ep, _req);
555 req = container_of(_req, struct net2280_request, req);
556 WARN_ON(!list_empty(&req->queue));
558 pci_pool_free(ep->dev->requests, req->td, req->td_dma);
562 /*-------------------------------------------------------------------------*/
564 /* load a packet into the fifo we use for usb IN transfers.
565 * works for all endpoints.
567 * NOTE: pio with ep-a..ep-d could stuff multiple packets into the fifo
568 * at a time, but this code is simpler because it knows it only writes
569 * one packet. ep-a..ep-d should use dma instead.
571 static void write_fifo(struct net2280_ep *ep, struct usb_request *req)
573 struct net2280_ep_regs __iomem *regs = ep->regs;
576 unsigned count, total;
578 /* INVARIANT: fifo is currently empty. (testable) */
581 buf = req->buf + req->actual;
583 total = req->length - req->actual;
589 /* write just one packet at a time */
590 count = ep->ep.maxpacket;
591 if (count > total) /* min() cannot be used on a bitfield */
594 ep_vdbg(ep->dev, "write %s fifo (IN) %d bytes%s req %p\n",
596 (count != ep->ep.maxpacket) ? " (short)" : "",
599 /* NOTE be careful if you try to align these. fifo lines
600 * should normally be full (4 bytes) and successive partial
601 * lines are ok only in certain cases.
603 tmp = get_unaligned((u32 *)buf);
605 writel(tmp, ®s->ep_data);
610 /* last fifo entry is "short" unless we wrote a full packet.
611 * also explicitly validate last word in (periodic) transfers
612 * when maxpacket is not a multiple of 4 bytes.
614 if (count || total < ep->ep.maxpacket) {
615 tmp = count ? get_unaligned((u32 *)buf) : count;
617 set_fifo_bytecount(ep, count & 0x03);
618 writel(tmp, ®s->ep_data);
621 /* pci writes may still be posted */
624 /* work around erratum 0106: PCI and USB race over the OUT fifo.
625 * caller guarantees chiprev 0100, out endpoint is NAKing, and
626 * there's no real data in the fifo.
628 * NOTE: also used in cases where that erratum doesn't apply:
629 * where the host wrote "too much" data to us.
631 static void out_flush(struct net2280_ep *ep)
636 statp = &ep->regs->ep_stat;
639 if (tmp & BIT(NAK_OUT_PACKETS)) {
640 ep_dbg(ep->dev, "%s %s %08x !NAK\n",
641 ep->ep.name, __func__, tmp);
642 writel(BIT(SET_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
645 writel(BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
646 BIT(DATA_PACKET_RECEIVED_INTERRUPT),
648 writel(BIT(FIFO_FLUSH), statp);
649 /* Make sure that stap is written */
652 if (tmp & BIT(DATA_OUT_PING_TOKEN_INTERRUPT) &&
653 /* high speed did bulk NYET; fifo isn't filling */
654 ep->dev->gadget.speed == USB_SPEED_FULL) {
657 usec = 50; /* 64 byte bulk/interrupt */
658 handshake(statp, BIT(USB_OUT_PING_NAK_SENT),
659 BIT(USB_OUT_PING_NAK_SENT), usec);
660 /* NAK done; now CLEAR_NAK_OUT_PACKETS is safe */
664 /* unload packet(s) from the fifo we use for usb OUT transfers.
665 * returns true iff the request completed, because of short packet
666 * or the request buffer having filled with full packets.
668 * for ep-a..ep-d this will read multiple packets out when they
669 * have been accepted.
671 static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
673 struct net2280_ep_regs __iomem *regs = ep->regs;
674 u8 *buf = req->req.buf + req->req.actual;
675 unsigned count, tmp, is_short;
676 unsigned cleanup = 0, prevent = 0;
678 /* erratum 0106 ... packets coming in during fifo reads might
679 * be incompletely rejected. not all cases have workarounds.
681 if (ep->dev->chiprev == 0x0100 &&
682 ep->dev->gadget.speed == USB_SPEED_FULL) {
684 tmp = readl(&ep->regs->ep_stat);
685 if ((tmp & BIT(NAK_OUT_PACKETS)))
687 else if ((tmp & BIT(FIFO_FULL))) {
688 start_out_naking(ep);
691 /* else: hope we don't see the problem */
694 /* never overflow the rx buffer. the fifo reads packets until
695 * it sees a short one; we might not be ready for them all.
698 count = readl(®s->ep_avail);
699 if (unlikely(count == 0)) {
701 tmp = readl(&ep->regs->ep_stat);
702 count = readl(®s->ep_avail);
703 /* handled that data already? */
704 if (count == 0 && (tmp & BIT(NAK_OUT_PACKETS)) == 0)
708 tmp = req->req.length - req->req.actual;
710 /* as with DMA, data overflow gets flushed */
711 if ((tmp % ep->ep.maxpacket) != 0) {
713 "%s out fifo %d bytes, expected %d\n",
714 ep->ep.name, count, tmp);
715 req->req.status = -EOVERFLOW;
717 /* NAK_OUT_PACKETS will be set, so flushing is safe;
718 * the next read will start with the next packet
720 } /* else it's a ZLP, no worries */
723 req->req.actual += count;
725 is_short = (count == 0) || ((count % ep->ep.maxpacket) != 0);
727 ep_vdbg(ep->dev, "read %s fifo (OUT) %d bytes%s%s%s req %p %d/%d\n",
728 ep->ep.name, count, is_short ? " (short)" : "",
729 cleanup ? " flush" : "", prevent ? " nak" : "",
730 req, req->req.actual, req->req.length);
733 tmp = readl(®s->ep_data);
735 put_unaligned(tmp, (u32 *)buf);
740 tmp = readl(®s->ep_data);
741 /* LE conversion is implicit here: */
750 writel(BIT(CLEAR_NAK_OUT_PACKETS), &ep->regs->ep_rsp);
751 (void) readl(&ep->regs->ep_rsp);
754 return is_short || ((req->req.actual == req->req.length) &&
758 /* fill out dma descriptor to match a given request */
759 static void fill_dma_desc(struct net2280_ep *ep,
760 struct net2280_request *req, int valid)
762 struct net2280_dma *td = req->td;
763 u32 dmacount = req->req.length;
765 /* don't let DMA continue after a short OUT packet,
766 * so overruns can't affect the next transfer.
767 * in case of overruns on max-size packets, we can't
768 * stop the fifo from filling but we can flush it.
771 dmacount |= BIT(DMA_DIRECTION);
772 if ((!ep->is_in && (dmacount % ep->ep.maxpacket) != 0) ||
773 !(ep->dev->quirks & PLX_2280))
774 dmacount |= BIT(END_OF_CHAIN);
778 dmacount |= BIT(VALID_BIT);
779 dmacount |= BIT(DMA_DONE_INTERRUPT_ENABLE);
781 /* td->dmadesc = previously set by caller */
782 td->dmaaddr = cpu_to_le32 (req->req.dma);
784 /* 2280 may be polling VALID_BIT through ep->dma->dmadesc */
786 td->dmacount = cpu_to_le32(dmacount);
789 static const u32 dmactl_default =
790 BIT(DMA_SCATTER_GATHER_DONE_INTERRUPT) |
791 BIT(DMA_CLEAR_COUNT_ENABLE) |
792 /* erratum 0116 workaround part 1 (use POLLING) */
793 (POLL_100_USEC << DESCRIPTOR_POLLING_RATE) |
794 BIT(DMA_VALID_BIT_POLLING_ENABLE) |
795 BIT(DMA_VALID_BIT_ENABLE) |
796 BIT(DMA_SCATTER_GATHER_ENABLE) |
797 /* erratum 0116 workaround part 2 (no AUTOSTART) */
800 static inline void spin_stop_dma(struct net2280_dma_regs __iomem *dma)
802 handshake(&dma->dmactl, BIT(DMA_ENABLE), 0, 50);
805 static inline void stop_dma(struct net2280_dma_regs __iomem *dma)
807 writel(readl(&dma->dmactl) & ~BIT(DMA_ENABLE), &dma->dmactl);
811 static void start_queue(struct net2280_ep *ep, u32 dmactl, u32 td_dma)
813 struct net2280_dma_regs __iomem *dma = ep->dma;
814 unsigned int tmp = BIT(VALID_BIT) | (ep->is_in << DMA_DIRECTION);
816 if (!(ep->dev->quirks & PLX_2280))
817 tmp |= BIT(END_OF_CHAIN);
819 writel(tmp, &dma->dmacount);
820 writel(readl(&dma->dmastat), &dma->dmastat);
822 writel(td_dma, &dma->dmadesc);
823 if (ep->dev->quirks & PLX_SUPERSPEED)
824 dmactl |= BIT(DMA_REQUEST_OUTSTANDING);
825 writel(dmactl, &dma->dmactl);
827 /* erratum 0116 workaround part 3: pci arbiter away from net2280 */
828 (void) readl(&ep->dev->pci->pcimstctl);
830 writel(BIT(DMA_START), &dma->dmastat);
836 static void start_dma(struct net2280_ep *ep, struct net2280_request *req)
839 struct net2280_dma_regs __iomem *dma = ep->dma;
841 /* FIXME can't use DMA for ZLPs */
843 /* on this path we "know" there's no dma active (yet) */
844 WARN_ON(readl(&dma->dmactl) & BIT(DMA_ENABLE));
845 writel(0, &ep->dma->dmactl);
847 /* previous OUT packet might have been short */
848 if (!ep->is_in && (readl(&ep->regs->ep_stat) &
849 BIT(NAK_OUT_PACKETS))) {
850 writel(BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT),
853 tmp = readl(&ep->regs->ep_avail);
855 writel(readl(&dma->dmastat), &dma->dmastat);
857 /* transfer all/some fifo data */
858 writel(req->req.dma, &dma->dmaaddr);
859 tmp = min(tmp, req->req.length);
861 /* dma irq, faking scatterlist status */
862 req->td->dmacount = cpu_to_le32(req->req.length - tmp);
863 writel(BIT(DMA_DONE_INTERRUPT_ENABLE) | tmp,
865 req->td->dmadesc = 0;
868 writel(BIT(DMA_ENABLE), &dma->dmactl);
869 writel(BIT(DMA_START), &dma->dmastat);
874 tmp = dmactl_default;
876 /* force packet boundaries between dma requests, but prevent the
877 * controller from automagically writing a last "short" packet
878 * (zero length) unless the driver explicitly said to do that.
881 if (likely((req->req.length % ep->ep.maxpacket) ||
883 tmp |= BIT(DMA_FIFO_VALIDATE);
884 ep->in_fifo_validate = 1;
886 ep->in_fifo_validate = 0;
889 /* init req->td, pointing to the current dummy */
890 req->td->dmadesc = cpu_to_le32 (ep->td_dma);
891 fill_dma_desc(ep, req, 1);
893 req->td->dmacount |= cpu_to_le32(BIT(END_OF_CHAIN));
895 start_queue(ep, tmp, req->td_dma);
899 queue_dma(struct net2280_ep *ep, struct net2280_request *req, int valid)
901 struct net2280_dma *end;
904 /* swap new dummy for old, link; fill and maybe activate */
910 ep->td_dma = req->td_dma;
913 end->dmadesc = cpu_to_le32 (ep->td_dma);
915 fill_dma_desc(ep, req, valid);
919 done(struct net2280_ep *ep, struct net2280_request *req, int status)
922 unsigned stopped = ep->stopped;
924 list_del_init(&req->queue);
926 if (req->req.status == -EINPROGRESS)
927 req->req.status = status;
929 status = req->req.status;
933 usb_gadget_unmap_request(&dev->gadget, &req->req, ep->is_in);
935 if (status && status != -ESHUTDOWN)
936 ep_vdbg(dev, "complete %s req %p stat %d len %u/%u\n",
937 ep->ep.name, &req->req, status,
938 req->req.actual, req->req.length);
940 /* don't modify queue heads during completion callback */
942 spin_unlock(&dev->lock);
943 usb_gadget_giveback_request(&ep->ep, &req->req);
944 spin_lock(&dev->lock);
945 ep->stopped = stopped;
948 /*-------------------------------------------------------------------------*/
951 net2280_queue(struct usb_ep *_ep, struct usb_request *_req, gfp_t gfp_flags)
953 struct net2280_request *req;
954 struct net2280_ep *ep;
959 /* we always require a cpu-view buffer, so that we can
960 * always use pio (as fallback or whatever).
962 ep = container_of(_ep, struct net2280_ep, ep);
963 if (!_ep || (!ep->desc && ep->num != 0)) {
964 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
967 req = container_of(_req, struct net2280_request, req);
968 if (!_req || !_req->complete || !_req->buf ||
969 !list_empty(&req->queue)) {
973 if (_req->length > (~0 & DMA_BYTE_COUNT_MASK)) {
978 if (!dev->driver || dev->gadget.speed == USB_SPEED_UNKNOWN) {
983 /* FIXME implement PIO fallback for ZLPs with DMA */
984 if (ep->dma && _req->length == 0) {
989 /* set up dma mapping in case the caller didn't */
991 ret = usb_gadget_map_request(&dev->gadget, _req,
997 ep_vdbg(dev, "%s queue req %p, len %d buf %p\n",
998 _ep->name, _req, _req->length, _req->buf);
1000 spin_lock_irqsave(&dev->lock, flags);
1002 _req->status = -EINPROGRESS;
1005 /* kickstart this i/o queue? */
1006 if (list_empty(&ep->queue) && !ep->stopped &&
1007 !((dev->quirks & PLX_SUPERSPEED) && ep->dma &&
1008 (readl(&ep->regs->ep_rsp) & BIT(CLEAR_ENDPOINT_HALT)))) {
1010 /* use DMA if the endpoint supports it, else pio */
1014 /* maybe there's no control data, just status ack */
1015 if (ep->num == 0 && _req->length == 0) {
1018 ep_vdbg(dev, "%s status ack\n", ep->ep.name);
1022 /* PIO ... stuff the fifo, or unblock it. */
1024 write_fifo(ep, _req);
1025 else if (list_empty(&ep->queue)) {
1028 /* OUT FIFO might have packet(s) buffered */
1029 s = readl(&ep->regs->ep_stat);
1030 if ((s & BIT(FIFO_EMPTY)) == 0) {
1031 /* note: _req->short_not_ok is
1032 * ignored here since PIO _always_
1033 * stops queue advance here, and
1034 * _req->status doesn't change for
1035 * short reads (only _req->actual)
1037 if (read_fifo(ep, req) &&
1041 /* don't queue it */
1043 } else if (read_fifo(ep, req) &&
1048 s = readl(&ep->regs->ep_stat);
1051 /* don't NAK, let the fifo fill */
1052 if (req && (s & BIT(NAK_OUT_PACKETS)))
1053 writel(BIT(CLEAR_NAK_OUT_PACKETS),
1058 } else if (ep->dma) {
1064 /* preventing magic zlps is per-engine state, not
1065 * per-transfer; irq logic must recover hiccups.
1067 expect = likely(req->req.zero ||
1068 (req->req.length % ep->ep.maxpacket));
1069 if (expect != ep->in_fifo_validate)
1072 queue_dma(ep, req, valid);
1074 } /* else the irq handler advances the queue. */
1078 list_add_tail(&req->queue, &ep->queue);
1080 spin_unlock_irqrestore(&dev->lock, flags);
1082 /* pci writes may still be posted */
1086 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, ret);
1091 dma_done(struct net2280_ep *ep, struct net2280_request *req, u32 dmacount,
1094 req->req.actual = req->req.length - (DMA_BYTE_COUNT_MASK & dmacount);
1095 done(ep, req, status);
1098 static void scan_dma_completions(struct net2280_ep *ep)
1100 /* only look at descriptors that were "naturally" retired,
1101 * so fifo and list head state won't matter
1103 while (!list_empty(&ep->queue)) {
1104 struct net2280_request *req;
1107 req = list_entry(ep->queue.next,
1108 struct net2280_request, queue);
1112 tmp = le32_to_cpup(&req->td->dmacount);
1113 if ((tmp & BIT(VALID_BIT)) != 0)
1116 /* SHORT_PACKET_TRANSFERRED_INTERRUPT handles "usb-short"
1117 * cases where DMA must be aborted; this code handles
1118 * all non-abort DMA completions.
1120 if (unlikely(req->td->dmadesc == 0)) {
1122 tmp = readl(&ep->dma->dmacount);
1123 if (tmp & DMA_BYTE_COUNT_MASK)
1125 /* single transfer mode */
1126 dma_done(ep, req, tmp, 0);
1128 } else if (!ep->is_in &&
1129 (req->req.length % ep->ep.maxpacket) &&
1130 !(ep->dev->quirks & PLX_SUPERSPEED)) {
1132 tmp = readl(&ep->regs->ep_stat);
1133 /* AVOID TROUBLE HERE by not issuing short reads from
1134 * your gadget driver. That helps avoids errata 0121,
1135 * 0122, and 0124; not all cases trigger the warning.
1137 if ((tmp & BIT(NAK_OUT_PACKETS)) == 0) {
1138 ep_warn(ep->dev, "%s lost packet sync!\n",
1140 req->req.status = -EOVERFLOW;
1142 tmp = readl(&ep->regs->ep_avail);
1144 /* fifo gets flushed later */
1145 ep->out_overflow = 1;
1147 "%s dma, discard %d len %d\n",
1150 req->req.status = -EOVERFLOW;
1154 dma_done(ep, req, tmp, 0);
1158 static void restart_dma(struct net2280_ep *ep)
1160 struct net2280_request *req;
1164 req = list_entry(ep->queue.next, struct net2280_request, queue);
1169 static void abort_dma(struct net2280_ep *ep)
1171 /* abort the current transfer */
1172 if (likely(!list_empty(&ep->queue))) {
1173 /* FIXME work around errata 0121, 0122, 0124 */
1174 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
1175 spin_stop_dma(ep->dma);
1178 scan_dma_completions(ep);
1181 /* dequeue ALL requests */
1182 static void nuke(struct net2280_ep *ep)
1184 struct net2280_request *req;
1186 /* called with spinlock held */
1190 while (!list_empty(&ep->queue)) {
1191 req = list_entry(ep->queue.next,
1192 struct net2280_request,
1194 done(ep, req, -ESHUTDOWN);
1198 /* dequeue JUST ONE request */
1199 static int net2280_dequeue(struct usb_ep *_ep, struct usb_request *_req)
1201 struct net2280_ep *ep;
1202 struct net2280_request *req;
1203 unsigned long flags;
1207 ep = container_of(_ep, struct net2280_ep, ep);
1208 if (!_ep || (!ep->desc && ep->num != 0) || !_req) {
1209 pr_err("%s: Invalid ep=%p or ep->desc or req=%p\n",
1210 __func__, _ep, _req);
1214 spin_lock_irqsave(&ep->dev->lock, flags);
1215 stopped = ep->stopped;
1217 /* quiesce dma while we patch the queue */
1221 dmactl = readl(&ep->dma->dmactl);
1222 /* WARNING erratum 0127 may kick in ... */
1224 scan_dma_completions(ep);
1227 /* make sure it's still queued on this endpoint */
1228 list_for_each_entry(req, &ep->queue, queue) {
1229 if (&req->req == _req)
1232 if (&req->req != _req) {
1233 spin_unlock_irqrestore(&ep->dev->lock, flags);
1234 dev_err(&ep->dev->pdev->dev, "%s: Request mismatch\n",
1239 /* queue head may be partially complete. */
1240 if (ep->queue.next == &req->queue) {
1242 ep_dbg(ep->dev, "unlink (%s) dma\n", _ep->name);
1243 _req->status = -ECONNRESET;
1245 if (likely(ep->queue.next == &req->queue)) {
1246 /* NOTE: misreports single-transfer mode*/
1247 req->td->dmacount = 0; /* invalidate */
1249 readl(&ep->dma->dmacount),
1253 ep_dbg(ep->dev, "unlink (%s) pio\n", _ep->name);
1254 done(ep, req, -ECONNRESET);
1260 done(ep, req, -ECONNRESET);
1261 ep->stopped = stopped;
1264 /* turn off dma on inactive queues */
1265 if (list_empty(&ep->queue))
1267 else if (!ep->stopped) {
1268 /* resume current request, or start new one */
1270 writel(dmactl, &ep->dma->dmactl);
1272 start_dma(ep, list_entry(ep->queue.next,
1273 struct net2280_request, queue));
1277 spin_unlock_irqrestore(&ep->dev->lock, flags);
1281 /*-------------------------------------------------------------------------*/
1283 static int net2280_fifo_status(struct usb_ep *_ep);
1286 net2280_set_halt_and_wedge(struct usb_ep *_ep, int value, int wedged)
1288 struct net2280_ep *ep;
1289 unsigned long flags;
1292 ep = container_of(_ep, struct net2280_ep, ep);
1293 if (!_ep || (!ep->desc && ep->num != 0)) {
1294 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1297 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1298 retval = -ESHUTDOWN;
1301 if (ep->desc /* not ep0 */ && (ep->desc->bmAttributes & 0x03)
1302 == USB_ENDPOINT_XFER_ISOC) {
1307 spin_lock_irqsave(&ep->dev->lock, flags);
1308 if (!list_empty(&ep->queue)) {
1311 } else if (ep->is_in && value && net2280_fifo_status(_ep) != 0) {
1315 ep_vdbg(ep->dev, "%s %s %s\n", _ep->name,
1316 value ? "set" : "clear",
1317 wedged ? "wedge" : "halt");
1318 /* set/clear, then synch memory views with the device */
1321 ep->dev->protocol_stall = 1;
1328 if (ep->dev->quirks & PLX_SUPERSPEED &&
1329 !list_empty(&ep->queue) && ep->td_dma)
1333 (void) readl(&ep->regs->ep_rsp);
1335 spin_unlock_irqrestore(&ep->dev->lock, flags);
1340 spin_unlock_irqrestore(&ep->dev->lock, flags);
1342 dev_err(&ep->dev->pdev->dev, "%s: error=%d\n", __func__, retval);
1346 static int net2280_set_halt(struct usb_ep *_ep, int value)
1348 return net2280_set_halt_and_wedge(_ep, value, 0);
1351 static int net2280_set_wedge(struct usb_ep *_ep)
1353 if (!_ep || _ep->name == ep0name) {
1354 pr_err("%s: Invalid ep=%p or ep0\n", __func__, _ep);
1357 return net2280_set_halt_and_wedge(_ep, 1, 1);
1360 static int net2280_fifo_status(struct usb_ep *_ep)
1362 struct net2280_ep *ep;
1365 ep = container_of(_ep, struct net2280_ep, ep);
1366 if (!_ep || (!ep->desc && ep->num != 0)) {
1367 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1370 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1371 dev_err(&ep->dev->pdev->dev,
1372 "%s: Invalid driver=%p or speed=%d\n",
1373 __func__, ep->dev->driver, ep->dev->gadget.speed);
1377 avail = readl(&ep->regs->ep_avail) & (BIT(12) - 1);
1378 if (avail > ep->fifo_size) {
1379 dev_err(&ep->dev->pdev->dev, "%s: Fifo overflow\n", __func__);
1383 avail = ep->fifo_size - avail;
1387 static void net2280_fifo_flush(struct usb_ep *_ep)
1389 struct net2280_ep *ep;
1391 ep = container_of(_ep, struct net2280_ep, ep);
1392 if (!_ep || (!ep->desc && ep->num != 0)) {
1393 pr_err("%s: Invalid ep=%p or ep->desc\n", __func__, _ep);
1396 if (!ep->dev->driver || ep->dev->gadget.speed == USB_SPEED_UNKNOWN) {
1397 dev_err(&ep->dev->pdev->dev,
1398 "%s: Invalid driver=%p or speed=%d\n",
1399 __func__, ep->dev->driver, ep->dev->gadget.speed);
1403 writel(BIT(FIFO_FLUSH), &ep->regs->ep_stat);
1404 (void) readl(&ep->regs->ep_rsp);
1407 static const struct usb_ep_ops net2280_ep_ops = {
1408 .enable = net2280_enable,
1409 .disable = net2280_disable,
1411 .alloc_request = net2280_alloc_request,
1412 .free_request = net2280_free_request,
1414 .queue = net2280_queue,
1415 .dequeue = net2280_dequeue,
1417 .set_halt = net2280_set_halt,
1418 .set_wedge = net2280_set_wedge,
1419 .fifo_status = net2280_fifo_status,
1420 .fifo_flush = net2280_fifo_flush,
1423 /*-------------------------------------------------------------------------*/
1425 static int net2280_get_frame(struct usb_gadget *_gadget)
1427 struct net2280 *dev;
1428 unsigned long flags;
1433 dev = container_of(_gadget, struct net2280, gadget);
1434 spin_lock_irqsave(&dev->lock, flags);
1435 retval = get_idx_reg(dev->regs, REG_FRAME) & 0x03ff;
1436 spin_unlock_irqrestore(&dev->lock, flags);
1440 static int net2280_wakeup(struct usb_gadget *_gadget)
1442 struct net2280 *dev;
1444 unsigned long flags;
1448 dev = container_of(_gadget, struct net2280, gadget);
1450 spin_lock_irqsave(&dev->lock, flags);
1451 tmp = readl(&dev->usb->usbctl);
1452 if (tmp & BIT(DEVICE_REMOTE_WAKEUP_ENABLE))
1453 writel(BIT(GENERATE_RESUME), &dev->usb->usbstat);
1454 spin_unlock_irqrestore(&dev->lock, flags);
1456 /* pci writes may still be posted */
1460 static int net2280_set_selfpowered(struct usb_gadget *_gadget, int value)
1462 struct net2280 *dev;
1464 unsigned long flags;
1468 dev = container_of(_gadget, struct net2280, gadget);
1470 spin_lock_irqsave(&dev->lock, flags);
1471 tmp = readl(&dev->usb->usbctl);
1473 tmp |= BIT(SELF_POWERED_STATUS);
1474 _gadget->is_selfpowered = 1;
1476 tmp &= ~BIT(SELF_POWERED_STATUS);
1477 _gadget->is_selfpowered = 0;
1479 writel(tmp, &dev->usb->usbctl);
1480 spin_unlock_irqrestore(&dev->lock, flags);
1485 static int net2280_pullup(struct usb_gadget *_gadget, int is_on)
1487 struct net2280 *dev;
1489 unsigned long flags;
1493 dev = container_of(_gadget, struct net2280, gadget);
1495 spin_lock_irqsave(&dev->lock, flags);
1496 tmp = readl(&dev->usb->usbctl);
1497 dev->softconnect = (is_on != 0);
1499 tmp |= BIT(USB_DETECT_ENABLE);
1501 tmp &= ~BIT(USB_DETECT_ENABLE);
1502 writel(tmp, &dev->usb->usbctl);
1503 spin_unlock_irqrestore(&dev->lock, flags);
1508 static int net2280_start(struct usb_gadget *_gadget,
1509 struct usb_gadget_driver *driver);
1510 static int net2280_stop(struct usb_gadget *_gadget);
1512 static const struct usb_gadget_ops net2280_ops = {
1513 .get_frame = net2280_get_frame,
1514 .wakeup = net2280_wakeup,
1515 .set_selfpowered = net2280_set_selfpowered,
1516 .pullup = net2280_pullup,
1517 .udc_start = net2280_start,
1518 .udc_stop = net2280_stop,
1521 /*-------------------------------------------------------------------------*/
1523 #ifdef CONFIG_USB_GADGET_DEBUG_FILES
1525 /* FIXME move these into procfs, and use seq_file.
1526 * Sysfs _still_ doesn't behave for arbitrarily sized files,
1527 * and also doesn't help products using this with 2.4 kernels.
1530 /* "function" sysfs attribute */
1531 static ssize_t function_show(struct device *_dev, struct device_attribute *attr,
1534 struct net2280 *dev = dev_get_drvdata(_dev);
1536 if (!dev->driver || !dev->driver->function ||
1537 strlen(dev->driver->function) > PAGE_SIZE)
1539 return scnprintf(buf, PAGE_SIZE, "%s\n", dev->driver->function);
1541 static DEVICE_ATTR_RO(function);
1543 static ssize_t registers_show(struct device *_dev,
1544 struct device_attribute *attr, char *buf)
1546 struct net2280 *dev;
1549 unsigned long flags;
1554 dev = dev_get_drvdata(_dev);
1557 spin_lock_irqsave(&dev->lock, flags);
1560 s = dev->driver->driver.name;
1564 /* Main Control Registers */
1565 t = scnprintf(next, size, "%s version " DRIVER_VERSION
1566 ", chiprev %04x\n\n"
1567 "devinit %03x fifoctl %08x gadget '%s'\n"
1568 "pci irqenb0 %02x irqenb1 %08x "
1569 "irqstat0 %04x irqstat1 %08x\n",
1570 driver_name, dev->chiprev,
1571 readl(&dev->regs->devinit),
1572 readl(&dev->regs->fifoctl),
1574 readl(&dev->regs->pciirqenb0),
1575 readl(&dev->regs->pciirqenb1),
1576 readl(&dev->regs->irqstat0),
1577 readl(&dev->regs->irqstat1));
1581 /* USB Control Registers */
1582 t1 = readl(&dev->usb->usbctl);
1583 t2 = readl(&dev->usb->usbstat);
1584 if (t1 & BIT(VBUS_PIN)) {
1585 if (t2 & BIT(HIGH_SPEED))
1587 else if (dev->gadget.speed == USB_SPEED_UNKNOWN)
1591 /* full speed bit (6) not working?? */
1594 t = scnprintf(next, size,
1595 "stdrsp %08x usbctl %08x usbstat %08x "
1596 "addr 0x%02x (%s)\n",
1597 readl(&dev->usb->stdrsp), t1, t2,
1598 readl(&dev->usb->ouraddr), s);
1602 /* PCI Master Control Registers */
1604 /* DMA Control Registers */
1606 /* Configurable EP Control Registers */
1607 for (i = 0; i < dev->n_ep; i++) {
1608 struct net2280_ep *ep;
1614 t1 = readl(&ep->cfg->ep_cfg);
1615 t2 = readl(&ep->regs->ep_rsp) & 0xff;
1616 t = scnprintf(next, size,
1617 "\n%s\tcfg %05x rsp (%02x) %s%s%s%s%s%s%s%s"
1619 ep->ep.name, t1, t2,
1620 (t2 & BIT(CLEAR_NAK_OUT_PACKETS))
1622 (t2 & BIT(CLEAR_EP_HIDE_STATUS_PHASE))
1624 (t2 & BIT(CLEAR_EP_FORCE_CRC_ERROR))
1626 (t2 & BIT(CLEAR_INTERRUPT_MODE))
1627 ? "interrupt " : "",
1628 (t2 & BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE))
1630 (t2 & BIT(CLEAR_NAK_OUT_PACKETS_MODE))
1632 (t2 & BIT(CLEAR_ENDPOINT_TOGGLE))
1633 ? "DATA1 " : "DATA0 ",
1634 (t2 & BIT(CLEAR_ENDPOINT_HALT))
1636 readl(&ep->regs->ep_irqenb));
1640 t = scnprintf(next, size,
1641 "\tstat %08x avail %04x "
1643 readl(&ep->regs->ep_stat),
1644 readl(&ep->regs->ep_avail),
1645 t1 & 0x0f, DIR_STRING(t1),
1646 type_string(t1 >> 8),
1647 ep->stopped ? "*" : "");
1654 t = scnprintf(next, size,
1655 " dma\tctl %08x stat %08x count %08x\n"
1656 "\taddr %08x desc %08x\n",
1657 readl(&ep->dma->dmactl),
1658 readl(&ep->dma->dmastat),
1659 readl(&ep->dma->dmacount),
1660 readl(&ep->dma->dmaaddr),
1661 readl(&ep->dma->dmadesc));
1667 /* Indexed Registers (none yet) */
1670 t = scnprintf(next, size, "\nirqs: ");
1673 for (i = 0; i < dev->n_ep; i++) {
1674 struct net2280_ep *ep;
1679 t = scnprintf(next, size, " %s/%lu", ep->ep.name, ep->irqs);
1684 t = scnprintf(next, size, "\n");
1688 spin_unlock_irqrestore(&dev->lock, flags);
1690 return PAGE_SIZE - size;
1692 static DEVICE_ATTR_RO(registers);
1694 static ssize_t queues_show(struct device *_dev, struct device_attribute *attr,
1697 struct net2280 *dev;
1700 unsigned long flags;
1703 dev = dev_get_drvdata(_dev);
1706 spin_lock_irqsave(&dev->lock, flags);
1708 for (i = 0; i < dev->n_ep; i++) {
1709 struct net2280_ep *ep = &dev->ep[i];
1710 struct net2280_request *req;
1714 const struct usb_endpoint_descriptor *d;
1719 t = d->bEndpointAddress;
1720 t = scnprintf(next, size,
1721 "\n%s (ep%d%s-%s) max %04x %s fifo %d\n",
1722 ep->ep.name, t & USB_ENDPOINT_NUMBER_MASK,
1723 (t & USB_DIR_IN) ? "in" : "out",
1724 type_string(d->bmAttributes),
1725 usb_endpoint_maxp(d) & 0x1fff,
1726 ep->dma ? "dma" : "pio", ep->fifo_size
1728 } else /* ep0 should only have one transfer queued */
1729 t = scnprintf(next, size, "ep0 max 64 pio %s\n",
1730 ep->is_in ? "in" : "out");
1731 if (t <= 0 || t > size)
1736 if (list_empty(&ep->queue)) {
1737 t = scnprintf(next, size, "\t(nothing queued)\n");
1738 if (t <= 0 || t > size)
1744 list_for_each_entry(req, &ep->queue, queue) {
1745 if (ep->dma && req->td_dma == readl(&ep->dma->dmadesc))
1746 t = scnprintf(next, size,
1747 "\treq %p len %d/%d "
1748 "buf %p (dmacount %08x)\n",
1749 &req->req, req->req.actual,
1750 req->req.length, req->req.buf,
1751 readl(&ep->dma->dmacount));
1753 t = scnprintf(next, size,
1754 "\treq %p len %d/%d buf %p\n",
1755 &req->req, req->req.actual,
1756 req->req.length, req->req.buf);
1757 if (t <= 0 || t > size)
1763 struct net2280_dma *td;
1766 t = scnprintf(next, size, "\t td %08x "
1767 " count %08x buf %08x desc %08x\n",
1769 le32_to_cpu(td->dmacount),
1770 le32_to_cpu(td->dmaaddr),
1771 le32_to_cpu(td->dmadesc));
1772 if (t <= 0 || t > size)
1781 spin_unlock_irqrestore(&dev->lock, flags);
1782 return PAGE_SIZE - size;
1784 static DEVICE_ATTR_RO(queues);
1789 #define device_create_file(a, b) (0)
1790 #define device_remove_file(a, b) do { } while (0)
1794 /*-------------------------------------------------------------------------*/
1796 /* another driver-specific mode might be a request type doing dma
1797 * to/from another device fifo instead of to/from memory.
1800 static void set_fifo_mode(struct net2280 *dev, int mode)
1802 /* keeping high bits preserves BAR2 */
1803 writel((0xffff << PCI_BASE2_RANGE) | mode, &dev->regs->fifoctl);
1805 /* always ep-{a,b,e,f} ... maybe not ep-c or ep-d */
1806 INIT_LIST_HEAD(&dev->gadget.ep_list);
1807 list_add_tail(&dev->ep[1].ep.ep_list, &dev->gadget.ep_list);
1808 list_add_tail(&dev->ep[2].ep.ep_list, &dev->gadget.ep_list);
1811 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1812 list_add_tail(&dev->ep[4].ep.ep_list, &dev->gadget.ep_list);
1813 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 1024;
1816 dev->ep[1].fifo_size = dev->ep[2].fifo_size = 2048;
1819 list_add_tail(&dev->ep[3].ep.ep_list, &dev->gadget.ep_list);
1820 dev->ep[1].fifo_size = 2048;
1821 dev->ep[2].fifo_size = 1024;
1824 /* fifo sizes for ep0, ep-c, ep-d, ep-e, and ep-f never change */
1825 list_add_tail(&dev->ep[5].ep.ep_list, &dev->gadget.ep_list);
1826 list_add_tail(&dev->ep[6].ep.ep_list, &dev->gadget.ep_list);
1829 static void defect7374_disable_data_eps(struct net2280 *dev)
1832 * For Defect 7374, disable data EPs (and more):
1833 * - This phase undoes the earlier phase of the Defect 7374 workaround,
1834 * returing ep regs back to normal.
1836 struct net2280_ep *ep;
1838 unsigned char ep_sel;
1841 for (i = 1; i < 5; i++) {
1843 writel(0, &ep->cfg->ep_cfg);
1846 /* CSROUT, CSRIN, PCIOUT, PCIIN, STATIN, RCIN */
1847 for (i = 0; i < 6; i++)
1848 writel(0, &dev->dep[i].dep_cfg);
1850 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1851 /* Select an endpoint for subsequent operations: */
1852 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1853 writel(((tmp_reg & ~0x1f) | ep_sel), &dev->plregs->pl_ep_ctrl);
1855 if (ep_sel < 2 || (ep_sel > 9 && ep_sel < 14) ||
1856 ep_sel == 18 || ep_sel == 20)
1859 /* Change settings on some selected endpoints */
1860 tmp_reg = readl(&dev->plregs->pl_ep_cfg_4);
1861 tmp_reg &= ~BIT(NON_CTRL_IN_TOLERATE_BAD_DIR);
1862 writel(tmp_reg, &dev->plregs->pl_ep_cfg_4);
1863 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1864 tmp_reg |= BIT(EP_INITIALIZED);
1865 writel(tmp_reg, &dev->plregs->pl_ep_ctrl);
1869 static void defect7374_enable_data_eps_zero(struct net2280 *dev)
1871 u32 tmp = 0, tmp_reg;
1874 unsigned char ep_sel;
1876 scratch = get_idx_reg(dev->regs, SCRATCH);
1878 WARN_ON((scratch & (0xf << DEFECT7374_FSM_FIELD))
1879 == DEFECT7374_FSM_SS_CONTROL_READ);
1881 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
1883 ep_warn(dev, "Operate Defect 7374 workaround soft this time");
1884 ep_warn(dev, "It will operate on cold-reboot and SS connect");
1887 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_DIRECTION) |
1888 (2 << OUT_ENDPOINT_TYPE) | (2 << IN_ENDPOINT_TYPE) |
1889 ((dev->enhanced_mode) ?
1890 BIT(OUT_ENDPOINT_ENABLE) | BIT(IN_ENDPOINT_ENABLE) :
1891 BIT(ENDPOINT_ENABLE)));
1893 for (i = 1; i < 5; i++)
1894 writel(tmp, &dev->ep[i].cfg->ep_cfg);
1896 /* CSRIN, PCIIN, STATIN, RCIN*/
1897 tmp = ((0 << ENDPOINT_NUMBER) | BIT(ENDPOINT_ENABLE));
1898 writel(tmp, &dev->dep[1].dep_cfg);
1899 writel(tmp, &dev->dep[3].dep_cfg);
1900 writel(tmp, &dev->dep[4].dep_cfg);
1901 writel(tmp, &dev->dep[5].dep_cfg);
1903 /*Implemented for development and debug.
1904 * Can be refined/tuned later.*/
1905 for (ep_sel = 0; ep_sel <= 21; ep_sel++) {
1906 /* Select an endpoint for subsequent operations: */
1907 tmp_reg = readl(&dev->plregs->pl_ep_ctrl);
1908 writel(((tmp_reg & ~0x1f) | ep_sel),
1909 &dev->plregs->pl_ep_ctrl);
1913 (readl(&dev->plregs->pl_ep_ctrl) |
1914 BIT(CLEAR_ACK_ERROR_CODE) | 0);
1915 writel(tmp, &dev->plregs->pl_ep_ctrl);
1919 if (ep_sel == 0 || (ep_sel > 9 && ep_sel < 14) ||
1920 ep_sel == 18 || ep_sel == 20)
1923 tmp = (readl(&dev->plregs->pl_ep_cfg_4) |
1924 BIT(NON_CTRL_IN_TOLERATE_BAD_DIR) | 0);
1925 writel(tmp, &dev->plregs->pl_ep_cfg_4);
1927 tmp = readl(&dev->plregs->pl_ep_ctrl) &
1928 ~BIT(EP_INITIALIZED);
1929 writel(tmp, &dev->plregs->pl_ep_ctrl);
1933 /* Set FSM to focus on the first Control Read:
1934 * - Tip: Connection speed is known upon the first
1936 scratch |= DEFECT7374_FSM_WAITING_FOR_CONTROL_READ;
1937 set_idx_reg(dev->regs, SCRATCH, scratch);
1941 /* keeping it simple:
1942 * - one bus driver, initted first;
1943 * - one function driver, initted second
1945 * most of the work to support multiple net2280 controllers would
1946 * be to associate this gadget driver (yes?) with all of them, or
1947 * perhaps to bind specific drivers to specific devices.
1950 static void usb_reset_228x(struct net2280 *dev)
1954 dev->gadget.speed = USB_SPEED_UNKNOWN;
1955 (void) readl(&dev->usb->usbctl);
1957 net2280_led_init(dev);
1959 /* disable automatic responses, and irqs */
1960 writel(0, &dev->usb->stdrsp);
1961 writel(0, &dev->regs->pciirqenb0);
1962 writel(0, &dev->regs->pciirqenb1);
1964 /* clear old dma and irq state */
1965 for (tmp = 0; tmp < 4; tmp++) {
1966 struct net2280_ep *ep = &dev->ep[tmp + 1];
1971 writel(~0, &dev->regs->irqstat0),
1972 writel(~(u32)BIT(SUSPEND_REQUEST_INTERRUPT), &dev->regs->irqstat1),
1974 /* reset, and enable pci */
1975 tmp = readl(&dev->regs->devinit) |
1977 BIT(FIFO_SOFT_RESET) |
1978 BIT(USB_SOFT_RESET) |
1980 writel(tmp, &dev->regs->devinit);
1982 /* standard fifo and endpoint allocations */
1983 set_fifo_mode(dev, (fifo_mode <= 2) ? fifo_mode : 0);
1986 static void usb_reset_338x(struct net2280 *dev)
1990 dev->gadget.speed = USB_SPEED_UNKNOWN;
1991 (void)readl(&dev->usb->usbctl);
1993 net2280_led_init(dev);
1995 if (dev->bug7734_patched) {
1996 /* disable automatic responses, and irqs */
1997 writel(0, &dev->usb->stdrsp);
1998 writel(0, &dev->regs->pciirqenb0);
1999 writel(0, &dev->regs->pciirqenb1);
2002 /* clear old dma and irq state */
2003 for (tmp = 0; tmp < 4; tmp++) {
2004 struct net2280_ep *ep = &dev->ep[tmp + 1];
2005 struct net2280_dma_regs __iomem *dma;
2010 dma = &dev->dma[tmp];
2011 writel(BIT(DMA_ABORT), &dma->dmastat);
2012 writel(0, &dma->dmactl);
2016 writel(~0, &dev->regs->irqstat0), writel(~0, &dev->regs->irqstat1);
2018 if (dev->bug7734_patched) {
2019 /* reset, and enable pci */
2020 tmp = readl(&dev->regs->devinit) |
2022 BIT(FIFO_SOFT_RESET) |
2023 BIT(USB_SOFT_RESET) |
2026 writel(tmp, &dev->regs->devinit);
2029 /* always ep-{1,2,3,4} ... maybe not ep-3 or ep-4 */
2030 INIT_LIST_HEAD(&dev->gadget.ep_list);
2032 for (tmp = 1; tmp < dev->n_ep; tmp++)
2033 list_add_tail(&dev->ep[tmp].ep.ep_list, &dev->gadget.ep_list);
2037 static void usb_reset(struct net2280 *dev)
2039 if (dev->quirks & PLX_LEGACY)
2040 return usb_reset_228x(dev);
2041 return usb_reset_338x(dev);
2044 static void usb_reinit_228x(struct net2280 *dev)
2048 /* basic endpoint init */
2049 for (tmp = 0; tmp < 7; tmp++) {
2050 struct net2280_ep *ep = &dev->ep[tmp];
2052 ep->ep.name = ep_name[tmp];
2056 if (tmp > 0 && tmp <= 4) {
2057 ep->fifo_size = 1024;
2058 ep->dma = &dev->dma[tmp - 1];
2061 ep->regs = &dev->epregs[tmp];
2062 ep->cfg = &dev->epregs[tmp];
2063 ep_reset_228x(dev->regs, ep);
2065 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 64);
2066 usb_ep_set_maxpacket_limit(&dev->ep[5].ep, 64);
2067 usb_ep_set_maxpacket_limit(&dev->ep[6].ep, 64);
2069 dev->gadget.ep0 = &dev->ep[0].ep;
2070 dev->ep[0].stopped = 0;
2071 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2073 /* we want to prevent lowlevel/insecure access from the USB host,
2074 * but erratum 0119 means this enable bit is ignored
2076 for (tmp = 0; tmp < 5; tmp++)
2077 writel(EP_DONTUSE, &dev->dep[tmp].dep_cfg);
2080 static void usb_reinit_338x(struct net2280 *dev)
2084 static const u32 ne[9] = { 0, 1, 2, 3, 4, 1, 2, 3, 4 };
2085 static const u32 ep_reg_addr[9] = { 0x00, 0xC0, 0x00, 0xC0, 0x00,
2086 0x00, 0xC0, 0x00, 0xC0 };
2088 /* basic endpoint init */
2089 for (i = 0; i < dev->n_ep; i++) {
2090 struct net2280_ep *ep = &dev->ep[i];
2092 ep->ep.name = dev->enhanced_mode ? ep_name_adv[i] : ep_name[i];
2096 if (i > 0 && i <= 4)
2097 ep->dma = &dev->dma[i - 1];
2099 if (dev->enhanced_mode) {
2100 ep->cfg = &dev->epregs[ne[i]];
2102 * Set USB endpoint number, hardware allows same number
2103 * in both directions.
2106 writel(ne[i], &ep->cfg->ep_cfg);
2107 ep->regs = (struct net2280_ep_regs __iomem *)
2108 (((void __iomem *)&dev->epregs[ne[i]]) +
2111 ep->cfg = &dev->epregs[i];
2112 ep->regs = &dev->epregs[i];
2115 ep->fifo_size = (i != 0) ? 2048 : 512;
2117 ep_reset_338x(dev->regs, ep);
2119 usb_ep_set_maxpacket_limit(&dev->ep[0].ep, 512);
2121 dev->gadget.ep0 = &dev->ep[0].ep;
2122 dev->ep[0].stopped = 0;
2124 /* Link layer set up */
2125 if (dev->bug7734_patched) {
2126 tmp = readl(&dev->usb_ext->usbctl2) &
2127 ~(BIT(U1_ENABLE) | BIT(U2_ENABLE) | BIT(LTM_ENABLE));
2128 writel(tmp, &dev->usb_ext->usbctl2);
2131 /* Hardware Defect and Workaround */
2132 val = readl(&dev->ll_lfps_regs->ll_lfps_5);
2133 val &= ~(0xf << TIMER_LFPS_6US);
2134 val |= 0x5 << TIMER_LFPS_6US;
2135 writel(val, &dev->ll_lfps_regs->ll_lfps_5);
2137 val = readl(&dev->ll_lfps_regs->ll_lfps_6);
2138 val &= ~(0xffff << TIMER_LFPS_80US);
2139 val |= 0x0100 << TIMER_LFPS_80US;
2140 writel(val, &dev->ll_lfps_regs->ll_lfps_6);
2143 * AA_AB Errata. Issue 4. Workaround for SuperSpeed USB
2144 * Hot Reset Exit Handshake may Fail in Specific Case using
2145 * Default Register Settings. Workaround for Enumeration test.
2147 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_2);
2148 val &= ~(0x1f << HOT_TX_NORESET_TS2);
2149 val |= 0x10 << HOT_TX_NORESET_TS2;
2150 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_2);
2152 val = readl(&dev->ll_tsn_regs->ll_tsn_counters_3);
2153 val &= ~(0x1f << HOT_RX_RESET_TS2);
2154 val |= 0x3 << HOT_RX_RESET_TS2;
2155 writel(val, &dev->ll_tsn_regs->ll_tsn_counters_3);
2158 * Set Recovery Idle to Recover bit:
2159 * - On SS connections, setting Recovery Idle to Recover Fmw improves
2160 * link robustness with various hosts and hubs.
2161 * - It is safe to set for all connection speeds; all chip revisions.
2162 * - R-M-W to leave other bits undisturbed.
2163 * - Reference PLX TT-7372
2165 val = readl(&dev->ll_chicken_reg->ll_tsn_chicken_bit);
2166 val |= BIT(RECOVERY_IDLE_TO_RECOVER_FMW);
2167 writel(val, &dev->ll_chicken_reg->ll_tsn_chicken_bit);
2169 INIT_LIST_HEAD(&dev->gadget.ep0->ep_list);
2171 /* disable dedicated endpoints */
2172 writel(0x0D, &dev->dep[0].dep_cfg);
2173 writel(0x0D, &dev->dep[1].dep_cfg);
2174 writel(0x0E, &dev->dep[2].dep_cfg);
2175 writel(0x0E, &dev->dep[3].dep_cfg);
2176 writel(0x0F, &dev->dep[4].dep_cfg);
2177 writel(0x0C, &dev->dep[5].dep_cfg);
2180 static void usb_reinit(struct net2280 *dev)
2182 if (dev->quirks & PLX_LEGACY)
2183 return usb_reinit_228x(dev);
2184 return usb_reinit_338x(dev);
2187 static void ep0_start_228x(struct net2280 *dev)
2189 writel(BIT(CLEAR_EP_HIDE_STATUS_PHASE) |
2190 BIT(CLEAR_NAK_OUT_PACKETS) |
2191 BIT(CLEAR_CONTROL_STATUS_PHASE_HANDSHAKE),
2192 &dev->epregs[0].ep_rsp);
2195 * hardware optionally handles a bunch of standard requests
2196 * that the API hides from drivers anyway. have it do so.
2197 * endpoint status/features are handled in software, to
2198 * help pass tests for some dubious behavior.
2200 writel(BIT(SET_TEST_MODE) |
2202 BIT(DEVICE_SET_CLEAR_DEVICE_REMOTE_WAKEUP) |
2203 BIT(GET_DEVICE_STATUS) |
2204 BIT(GET_INTERFACE_STATUS),
2206 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2207 BIT(SELF_POWERED_USB_DEVICE) |
2208 BIT(REMOTE_WAKEUP_SUPPORT) |
2209 (dev->softconnect << USB_DETECT_ENABLE) |
2210 BIT(SELF_POWERED_STATUS),
2213 /* enable irqs so we can see ep0 and general operation */
2214 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2215 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2216 &dev->regs->pciirqenb0);
2217 writel(BIT(PCI_INTERRUPT_ENABLE) |
2218 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2219 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT_ENABLE) |
2220 BIT(PCI_RETRY_ABORT_INTERRUPT_ENABLE) |
2221 BIT(VBUS_INTERRUPT_ENABLE) |
2222 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2223 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE),
2224 &dev->regs->pciirqenb1);
2226 /* don't leave any writes posted */
2227 (void) readl(&dev->usb->usbctl);
2230 static void ep0_start_338x(struct net2280 *dev)
2233 if (dev->bug7734_patched)
2234 writel(BIT(CLEAR_NAK_OUT_PACKETS_MODE) |
2235 BIT(SET_EP_HIDE_STATUS_PHASE),
2236 &dev->epregs[0].ep_rsp);
2239 * hardware optionally handles a bunch of standard requests
2240 * that the API hides from drivers anyway. have it do so.
2241 * endpoint status/features are handled in software, to
2242 * help pass tests for some dubious behavior.
2244 writel(BIT(SET_ISOCHRONOUS_DELAY) |
2246 BIT(SET_TEST_MODE) |
2248 BIT(GET_INTERFACE_STATUS) |
2249 BIT(GET_DEVICE_STATUS),
2251 dev->wakeup_enable = 1;
2252 writel(BIT(USB_ROOT_PORT_WAKEUP_ENABLE) |
2253 (dev->softconnect << USB_DETECT_ENABLE) |
2254 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2257 /* enable irqs so we can see ep0 and general operation */
2258 writel(BIT(SETUP_PACKET_INTERRUPT_ENABLE) |
2259 BIT(ENDPOINT_0_INTERRUPT_ENABLE),
2260 &dev->regs->pciirqenb0);
2261 writel(BIT(PCI_INTERRUPT_ENABLE) |
2262 BIT(ROOT_PORT_RESET_INTERRUPT_ENABLE) |
2263 BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT_ENABLE) |
2264 BIT(VBUS_INTERRUPT_ENABLE),
2265 &dev->regs->pciirqenb1);
2267 /* don't leave any writes posted */
2268 (void)readl(&dev->usb->usbctl);
2271 static void ep0_start(struct net2280 *dev)
2273 if (dev->quirks & PLX_LEGACY)
2274 return ep0_start_228x(dev);
2275 return ep0_start_338x(dev);
2278 /* when a driver is successfully registered, it will receive
2279 * control requests including set_configuration(), which enables
2280 * non-control requests. then usb traffic follows until a
2281 * disconnect is reported. then a host may connect again, or
2282 * the driver might get unbound.
2284 static int net2280_start(struct usb_gadget *_gadget,
2285 struct usb_gadget_driver *driver)
2287 struct net2280 *dev;
2291 /* insist on high speed support from the driver, since
2292 * (dev->usb->xcvrdiag & FORCE_FULL_SPEED_MODE)
2293 * "must not be used in normal operation"
2295 if (!driver || driver->max_speed < USB_SPEED_HIGH ||
2299 dev = container_of(_gadget, struct net2280, gadget);
2301 for (i = 0; i < dev->n_ep; i++)
2302 dev->ep[i].irqs = 0;
2304 /* hook up the driver ... */
2305 driver->driver.bus = NULL;
2306 dev->driver = driver;
2308 retval = device_create_file(&dev->pdev->dev, &dev_attr_function);
2311 retval = device_create_file(&dev->pdev->dev, &dev_attr_queues);
2315 /* enable host detection and ep0; and we're ready
2316 * for set_configuration as well as eventual disconnect.
2318 net2280_led_active(dev, 1);
2320 if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
2321 defect7374_enable_data_eps_zero(dev);
2325 /* pci writes may still be posted */
2329 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2335 static void stop_activity(struct net2280 *dev, struct usb_gadget_driver *driver)
2339 /* don't disconnect if it's not connected */
2340 if (dev->gadget.speed == USB_SPEED_UNKNOWN)
2343 /* stop hardware; prevent new request submissions;
2344 * and kill any outstanding requests.
2347 for (i = 0; i < dev->n_ep; i++)
2350 /* report disconnect; the driver is already quiesced */
2352 spin_unlock(&dev->lock);
2353 driver->disconnect(&dev->gadget);
2354 spin_lock(&dev->lock);
2360 static int net2280_stop(struct usb_gadget *_gadget)
2362 struct net2280 *dev;
2363 unsigned long flags;
2365 dev = container_of(_gadget, struct net2280, gadget);
2367 spin_lock_irqsave(&dev->lock, flags);
2368 stop_activity(dev, NULL);
2369 spin_unlock_irqrestore(&dev->lock, flags);
2371 net2280_led_active(dev, 0);
2373 device_remove_file(&dev->pdev->dev, &dev_attr_function);
2374 device_remove_file(&dev->pdev->dev, &dev_attr_queues);
2381 /*-------------------------------------------------------------------------*/
2383 /* handle ep0, ep-e, ep-f with 64 byte packets: packet per irq.
2384 * also works for dma-capable endpoints, in pio mode or just
2385 * to manually advance the queue after short OUT transfers.
2387 static void handle_ep_small(struct net2280_ep *ep)
2389 struct net2280_request *req;
2391 /* 0 error, 1 mid-data, 2 done */
2394 if (!list_empty(&ep->queue))
2395 req = list_entry(ep->queue.next,
2396 struct net2280_request, queue);
2400 /* ack all, and handle what we care about */
2401 t = readl(&ep->regs->ep_stat);
2404 ep_vdbg(ep->dev, "%s ack ep_stat %08x, req %p\n",
2405 ep->ep.name, t, req ? &req->req : NULL);
2407 if (!ep->is_in || (ep->dev->quirks & PLX_2280))
2408 writel(t & ~BIT(NAK_OUT_PACKETS), &ep->regs->ep_stat);
2410 /* Added for 2282 */
2411 writel(t, &ep->regs->ep_stat);
2413 /* for ep0, monitor token irqs to catch data stage length errors
2414 * and to synchronize on status.
2416 * also, to defer reporting of protocol stalls ... here's where
2417 * data or status first appears, handling stalls here should never
2418 * cause trouble on the host side..
2420 * control requests could be slightly faster without token synch for
2421 * status, but status can jam up that way.
2423 if (unlikely(ep->num == 0)) {
2425 /* status; stop NAKing */
2426 if (t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) {
2427 if (ep->dev->protocol_stall) {
2434 /* reply to extra IN data tokens with a zlp */
2435 } else if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2436 if (ep->dev->protocol_stall) {
2440 } else if (ep->responded &&
2441 !req && !ep->stopped)
2442 write_fifo(ep, NULL);
2445 /* status; stop NAKing */
2446 if (t & BIT(DATA_IN_TOKEN_INTERRUPT)) {
2447 if (ep->dev->protocol_stall) {
2452 /* an extra OUT token is an error */
2453 } else if (((t & BIT(DATA_OUT_PING_TOKEN_INTERRUPT)) &&
2455 req->req.actual == req->req.length) ||
2456 (ep->responded && !req)) {
2457 ep->dev->protocol_stall = 1;
2461 done(ep, req, -EOVERFLOW);
2470 /* manual DMA queue advance after short OUT */
2471 if (likely(ep->dma)) {
2472 if (t & BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT)) {
2474 int stopped = ep->stopped;
2476 /* TRANSFERRED works around OUT_DONE erratum 0112.
2477 * we expect (N <= maxpacket) bytes; host wrote M.
2478 * iff (M < N) we won't ever see a DMA interrupt.
2481 for (count = 0; ; t = readl(&ep->regs->ep_stat)) {
2483 /* any preceding dma transfers must finish.
2484 * dma handles (M >= N), may empty the queue
2486 scan_dma_completions(ep);
2487 if (unlikely(list_empty(&ep->queue) ||
2488 ep->out_overflow)) {
2492 req = list_entry(ep->queue.next,
2493 struct net2280_request, queue);
2495 /* here either (M < N), a "real" short rx;
2496 * or (M == N) and the queue didn't empty
2498 if (likely(t & BIT(FIFO_EMPTY))) {
2499 count = readl(&ep->dma->dmacount);
2500 count &= DMA_BYTE_COUNT_MASK;
2501 if (readl(&ep->dma->dmadesc)
2509 /* stop DMA, leave ep NAKing */
2510 writel(BIT(DMA_ABORT), &ep->dma->dmastat);
2511 spin_stop_dma(ep->dma);
2514 req->td->dmacount = 0;
2515 t = readl(&ep->regs->ep_avail);
2516 dma_done(ep, req, count,
2517 (ep->out_overflow || t)
2521 /* also flush to prevent erratum 0106 trouble */
2522 if (unlikely(ep->out_overflow ||
2523 (ep->dev->chiprev == 0x0100 &&
2524 ep->dev->gadget.speed
2525 == USB_SPEED_FULL))) {
2527 ep->out_overflow = 0;
2530 /* (re)start dma if needed, stop NAKing */
2531 ep->stopped = stopped;
2532 if (!list_empty(&ep->queue))
2535 ep_dbg(ep->dev, "%s dma ep_stat %08x ??\n",
2539 /* data packet(s) received (in the fifo, OUT) */
2540 } else if (t & BIT(DATA_PACKET_RECEIVED_INTERRUPT)) {
2541 if (read_fifo(ep, req) && ep->num != 0)
2544 /* data packet(s) transmitted (IN) */
2545 } else if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT)) {
2548 len = req->req.length - req->req.actual;
2549 if (len > ep->ep.maxpacket)
2550 len = ep->ep.maxpacket;
2551 req->req.actual += len;
2553 /* if we wrote it all, we're usually done */
2554 /* send zlps until the status stage */
2555 if ((req->req.actual == req->req.length) &&
2556 (!req->req.zero || len != ep->ep.maxpacket) && ep->num)
2559 /* there was nothing to do ... */
2560 } else if (mode == 1)
2565 /* stream endpoints often resubmit/unlink in completion */
2568 /* maybe advance queue to next request */
2570 /* NOTE: net2280 could let gadget driver start the
2571 * status stage later. since not all controllers let
2572 * them control that, the api doesn't (yet) allow it.
2578 if (!list_empty(&ep->queue) && !ep->stopped)
2579 req = list_entry(ep->queue.next,
2580 struct net2280_request, queue);
2583 if (req && !ep->is_in)
2584 stop_out_naking(ep);
2588 /* is there a buffer for the next packet?
2589 * for best streaming performance, make sure there is one.
2591 if (req && !ep->stopped) {
2593 /* load IN fifo with next packet (may be zlp) */
2594 if (t & BIT(DATA_PACKET_TRANSMITTED_INTERRUPT))
2595 write_fifo(ep, &req->req);
2599 static struct net2280_ep *get_ep_by_addr(struct net2280 *dev, u16 wIndex)
2601 struct net2280_ep *ep;
2603 if ((wIndex & USB_ENDPOINT_NUMBER_MASK) == 0)
2605 list_for_each_entry(ep, &dev->gadget.ep_list, ep.ep_list) {
2606 u8 bEndpointAddress;
2610 bEndpointAddress = ep->desc->bEndpointAddress;
2611 if ((wIndex ^ bEndpointAddress) & USB_DIR_IN)
2613 if ((wIndex & 0x0f) == (bEndpointAddress & 0x0f))
2619 static void defect7374_workaround(struct net2280 *dev, struct usb_ctrlrequest r)
2621 u32 scratch, fsmvalue;
2622 u32 ack_wait_timeout, state;
2624 /* Workaround for Defect 7374 (U1/U2 erroneously rejected): */
2625 scratch = get_idx_reg(dev->regs, SCRATCH);
2626 fsmvalue = scratch & (0xf << DEFECT7374_FSM_FIELD);
2627 scratch &= ~(0xf << DEFECT7374_FSM_FIELD);
2629 if (!((fsmvalue == DEFECT7374_FSM_WAITING_FOR_CONTROL_READ) &&
2630 (r.bRequestType & USB_DIR_IN)))
2633 /* This is the first Control Read for this connection: */
2634 if (!(readl(&dev->usb->usbstat) & BIT(SUPER_SPEED_MODE))) {
2636 * Connection is NOT SS:
2637 * - Connection must be FS or HS.
2638 * - This FSM state should allow workaround software to
2639 * run after the next USB connection.
2641 scratch |= DEFECT7374_FSM_NON_SS_CONTROL_READ;
2642 dev->bug7734_patched = 1;
2643 goto restore_data_eps;
2646 /* Connection is SS: */
2647 for (ack_wait_timeout = 0;
2648 ack_wait_timeout < DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS;
2649 ack_wait_timeout++) {
2651 state = readl(&dev->plregs->pl_ep_status_1)
2653 if ((state >= (ACK_GOOD_NORMAL << STATE)) &&
2654 (state <= (ACK_GOOD_MORE_ACKS_TO_COME << STATE))) {
2655 scratch |= DEFECT7374_FSM_SS_CONTROL_READ;
2656 dev->bug7734_patched = 1;
2661 * We have not yet received host's Data Phase ACK
2662 * - Wait and try again.
2664 udelay(DEFECT_7374_PROCESSOR_WAIT_TIME);
2670 if (ack_wait_timeout >= DEFECT_7374_NUMBEROF_MAX_WAIT_LOOPS) {
2671 ep_err(dev, "FAIL: Defect 7374 workaround waited but failed "
2672 "to detect SS host's data phase ACK.");
2673 ep_err(dev, "PL_EP_STATUS_1(23:16):.Expected from 0x11 to 0x16"
2674 "got 0x%2.2x.\n", state >> STATE);
2676 ep_warn(dev, "INFO: Defect 7374 workaround waited about\n"
2677 "%duSec for Control Read Data Phase ACK\n",
2678 DEFECT_7374_PROCESSOR_WAIT_TIME * ack_wait_timeout);
2683 * Restore data EPs to their pre-workaround settings (disabled,
2684 * initialized, and other details).
2686 defect7374_disable_data_eps(dev);
2688 set_idx_reg(dev->regs, SCRATCH, scratch);
2693 static void ep_clear_seqnum(struct net2280_ep *ep)
2695 struct net2280 *dev = ep->dev;
2697 static const u32 ep_pl[9] = { 0, 3, 4, 7, 8, 2, 5, 6, 9 };
2699 val = readl(&dev->plregs->pl_ep_ctrl) & ~0x1f;
2700 val |= ep_pl[ep->num];
2701 writel(val, &dev->plregs->pl_ep_ctrl);
2702 val |= BIT(SEQUENCE_NUMBER_RESET);
2703 writel(val, &dev->plregs->pl_ep_ctrl);
2708 static void handle_stat0_irqs_superspeed(struct net2280 *dev,
2709 struct net2280_ep *ep, struct usb_ctrlrequest r)
2713 #define w_value le16_to_cpu(r.wValue)
2714 #define w_index le16_to_cpu(r.wIndex)
2715 #define w_length le16_to_cpu(r.wLength)
2717 switch (r.bRequest) {
2718 struct net2280_ep *e;
2721 case USB_REQ_SET_CONFIGURATION:
2722 dev->addressed_state = !w_value;
2725 case USB_REQ_GET_STATUS:
2726 switch (r.bRequestType) {
2727 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2728 status = dev->wakeup_enable ? 0x02 : 0x00;
2729 if (dev->gadget.is_selfpowered)
2731 status |= (dev->u1_enable << 2 | dev->u2_enable << 3 |
2732 dev->ltm_enable << 4);
2733 writel(0, &dev->epregs[0].ep_irqenb);
2734 set_fifo_bytecount(ep, sizeof(status));
2735 writel((__force u32) status, &dev->epregs[0].ep_data);
2736 allow_status_338x(ep);
2739 case (USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2740 e = get_ep_by_addr(dev, w_index);
2743 status = readl(&e->regs->ep_rsp) &
2744 BIT(CLEAR_ENDPOINT_HALT);
2745 writel(0, &dev->epregs[0].ep_irqenb);
2746 set_fifo_bytecount(ep, sizeof(status));
2747 writel((__force u32) status, &dev->epregs[0].ep_data);
2748 allow_status_338x(ep);
2756 case USB_REQ_CLEAR_FEATURE:
2757 switch (r.bRequestType) {
2758 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2759 if (!dev->addressed_state) {
2761 case USB_DEVICE_U1_ENABLE:
2763 writel(readl(&dev->usb_ext->usbctl2) &
2765 &dev->usb_ext->usbctl2);
2766 allow_status_338x(ep);
2767 goto next_endpoints3;
2769 case USB_DEVICE_U2_ENABLE:
2771 writel(readl(&dev->usb_ext->usbctl2) &
2773 &dev->usb_ext->usbctl2);
2774 allow_status_338x(ep);
2775 goto next_endpoints3;
2777 case USB_DEVICE_LTM_ENABLE:
2778 dev->ltm_enable = 0;
2779 writel(readl(&dev->usb_ext->usbctl2) &
2781 &dev->usb_ext->usbctl2);
2782 allow_status_338x(ep);
2783 goto next_endpoints3;
2789 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2790 dev->wakeup_enable = 0;
2791 writel(readl(&dev->usb->usbctl) &
2792 ~BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2794 allow_status_338x(ep);
2799 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2800 e = get_ep_by_addr(dev, w_index);
2803 if (w_value != USB_ENDPOINT_HALT)
2805 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
2807 * Workaround for SS SeqNum not cleared via
2808 * Endpoint Halt (Clear) bit. select endpoint
2812 if (!list_empty(&e->queue) && e->td_dma)
2822 case USB_REQ_SET_FEATURE:
2823 switch (r.bRequestType) {
2824 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE):
2825 if (!dev->addressed_state) {
2827 case USB_DEVICE_U1_ENABLE:
2829 writel(readl(&dev->usb_ext->usbctl2) |
2831 &dev->usb_ext->usbctl2);
2832 allow_status_338x(ep);
2833 goto next_endpoints3;
2835 case USB_DEVICE_U2_ENABLE:
2837 writel(readl(&dev->usb_ext->usbctl2) |
2839 &dev->usb_ext->usbctl2);
2840 allow_status_338x(ep);
2841 goto next_endpoints3;
2843 case USB_DEVICE_LTM_ENABLE:
2844 dev->ltm_enable = 1;
2845 writel(readl(&dev->usb_ext->usbctl2) |
2847 &dev->usb_ext->usbctl2);
2848 allow_status_338x(ep);
2849 goto next_endpoints3;
2855 if (w_value == USB_DEVICE_REMOTE_WAKEUP) {
2856 dev->wakeup_enable = 1;
2857 writel(readl(&dev->usb->usbctl) |
2858 BIT(DEVICE_REMOTE_WAKEUP_ENABLE),
2860 allow_status_338x(ep);
2865 case (USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_ENDPOINT):
2866 e = get_ep_by_addr(dev, w_index);
2867 if (!e || (w_value != USB_ENDPOINT_HALT))
2871 ep->dev->protocol_stall = 1;
2877 allow_status_338x(ep);
2888 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x ep_cfg %08x\n",
2889 r.bRequestType, r.bRequest,
2890 w_value, w_index, w_length,
2891 readl(&ep->cfg->ep_cfg));
2894 spin_unlock(&dev->lock);
2895 tmp = dev->driver->setup(&dev->gadget, &r);
2896 spin_lock(&dev->lock);
2900 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
2901 r.bRequestType, r.bRequest, tmp);
2902 dev->protocol_stall = 1;
2903 /* TD 9.9 Halt Endpoint test. TD 9.22 Set feature test */
2916 static void usb338x_handle_ep_intr(struct net2280 *dev, u32 stat0)
2921 for (index = 0; index < ARRAY_SIZE(ep_bit); index++) {
2922 bit = BIT(ep_bit[index]);
2932 handle_ep_small(&dev->ep[index]);
2936 static void handle_stat0_irqs(struct net2280 *dev, u32 stat)
2938 struct net2280_ep *ep;
2941 /* most of these don't need individual acks */
2942 stat &= ~BIT(INTA_ASSERTED);
2945 /* ep_dbg(dev, "irqstat0 %04x\n", stat); */
2947 /* starting a control request? */
2948 if (unlikely(stat & BIT(SETUP_PACKET_INTERRUPT))) {
2951 struct usb_ctrlrequest r;
2954 struct net2280_request *req;
2956 if (dev->gadget.speed == USB_SPEED_UNKNOWN) {
2957 u32 val = readl(&dev->usb->usbstat);
2958 if (val & BIT(SUPER_SPEED)) {
2959 dev->gadget.speed = USB_SPEED_SUPER;
2960 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2961 EP0_SS_MAX_PACKET_SIZE);
2962 } else if (val & BIT(HIGH_SPEED)) {
2963 dev->gadget.speed = USB_SPEED_HIGH;
2964 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2965 EP0_HS_MAX_PACKET_SIZE);
2967 dev->gadget.speed = USB_SPEED_FULL;
2968 usb_ep_set_maxpacket_limit(&dev->ep[0].ep,
2969 EP0_HS_MAX_PACKET_SIZE);
2971 net2280_led_speed(dev, dev->gadget.speed);
2973 usb_speed_string(dev->gadget.speed));
2979 /* make sure any leftover request state is cleared */
2980 stat &= ~BIT(ENDPOINT_0_INTERRUPT);
2981 while (!list_empty(&ep->queue)) {
2982 req = list_entry(ep->queue.next,
2983 struct net2280_request, queue);
2984 done(ep, req, (req->req.actual == req->req.length)
2988 dev->protocol_stall = 0;
2989 if (!(dev->quirks & PLX_SUPERSPEED)) {
2990 if (ep->dev->quirks & PLX_2280)
2991 tmp = BIT(FIFO_OVERFLOW) |
2992 BIT(FIFO_UNDERFLOW);
2996 writel(tmp | BIT(TIMEOUT) |
2997 BIT(USB_STALL_SENT) |
2998 BIT(USB_IN_NAK_SENT) |
2999 BIT(USB_IN_ACK_RCVD) |
3000 BIT(USB_OUT_PING_NAK_SENT) |
3001 BIT(USB_OUT_ACK_SENT) |
3002 BIT(SHORT_PACKET_OUT_DONE_INTERRUPT) |
3003 BIT(SHORT_PACKET_TRANSFERRED_INTERRUPT) |
3004 BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3005 BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3006 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3007 BIT(DATA_IN_TOKEN_INTERRUPT),
3008 &ep->regs->ep_stat);
3010 u.raw[0] = readl(&dev->usb->setup0123);
3011 u.raw[1] = readl(&dev->usb->setup4567);
3013 cpu_to_le32s(&u.raw[0]);
3014 cpu_to_le32s(&u.raw[1]);
3016 if ((dev->quirks & PLX_SUPERSPEED) && !dev->bug7734_patched)
3017 defect7374_workaround(dev, u.r);
3021 #define w_value le16_to_cpu(u.r.wValue)
3022 #define w_index le16_to_cpu(u.r.wIndex)
3023 #define w_length le16_to_cpu(u.r.wLength)
3026 writel(BIT(SETUP_PACKET_INTERRUPT), &dev->regs->irqstat0);
3027 stat ^= BIT(SETUP_PACKET_INTERRUPT);
3029 /* watch control traffic at the token level, and force
3030 * synchronization before letting the status stage happen.
3031 * FIXME ignore tokens we'll NAK, until driver responds.
3032 * that'll mean a lot less irqs for some drivers.
3034 ep->is_in = (u.r.bRequestType & USB_DIR_IN) != 0;
3036 scratch = BIT(DATA_PACKET_TRANSMITTED_INTERRUPT) |
3037 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3038 BIT(DATA_IN_TOKEN_INTERRUPT);
3039 stop_out_naking(ep);
3041 scratch = BIT(DATA_PACKET_RECEIVED_INTERRUPT) |
3042 BIT(DATA_OUT_PING_TOKEN_INTERRUPT) |
3043 BIT(DATA_IN_TOKEN_INTERRUPT);
3044 writel(scratch, &dev->epregs[0].ep_irqenb);
3046 /* we made the hardware handle most lowlevel requests;
3047 * everything else goes uplevel to the gadget code.
3051 if (dev->gadget.speed == USB_SPEED_SUPER) {
3052 handle_stat0_irqs_superspeed(dev, ep, u.r);
3053 goto next_endpoints;
3056 switch (u.r.bRequest) {
3057 case USB_REQ_GET_STATUS: {
3058 struct net2280_ep *e;
3061 /* hw handles device and interface status */
3062 if (u.r.bRequestType != (USB_DIR_IN|USB_RECIP_ENDPOINT))
3064 e = get_ep_by_addr(dev, w_index);
3065 if (!e || w_length > 2)
3068 if (readl(&e->regs->ep_rsp) & BIT(SET_ENDPOINT_HALT))
3069 status = cpu_to_le32(1);
3071 status = cpu_to_le32(0);
3073 /* don't bother with a request object! */
3074 writel(0, &dev->epregs[0].ep_irqenb);
3075 set_fifo_bytecount(ep, w_length);
3076 writel((__force u32)status, &dev->epregs[0].ep_data);
3078 ep_vdbg(dev, "%s stat %02x\n", ep->ep.name, status);
3079 goto next_endpoints;
3082 case USB_REQ_CLEAR_FEATURE: {
3083 struct net2280_ep *e;
3085 /* hw handles device features */
3086 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3088 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3090 e = get_ep_by_addr(dev, w_index);
3094 ep_vdbg(dev, "%s wedged, halt not cleared\n",
3097 ep_vdbg(dev, "%s clear halt\n", e->ep.name);
3099 if ((ep->dev->quirks & PLX_SUPERSPEED) &&
3100 !list_empty(&e->queue) && e->td_dma)
3104 goto next_endpoints;
3107 case USB_REQ_SET_FEATURE: {
3108 struct net2280_ep *e;
3110 /* hw handles device features */
3111 if (u.r.bRequestType != USB_RECIP_ENDPOINT)
3113 if (w_value != USB_ENDPOINT_HALT || w_length != 0)
3115 e = get_ep_by_addr(dev, w_index);
3118 if (e->ep.name == ep0name)
3121 if ((dev->quirks & PLX_SUPERSPEED) && e->dma)
3124 ep_vdbg(dev, "%s set halt\n", ep->ep.name);
3125 goto next_endpoints;
3130 ep_vdbg(dev, "setup %02x.%02x v%04x i%04x l%04x "
3132 u.r.bRequestType, u.r.bRequest,
3133 w_value, w_index, w_length,
3134 readl(&ep->cfg->ep_cfg));
3136 spin_unlock(&dev->lock);
3137 tmp = dev->driver->setup(&dev->gadget, &u.r);
3138 spin_lock(&dev->lock);
3141 /* stall ep0 on error */
3144 ep_vdbg(dev, "req %02x.%02x protocol STALL; stat %d\n",
3145 u.r.bRequestType, u.r.bRequest, tmp);
3146 dev->protocol_stall = 1;
3149 /* some in/out token irq should follow; maybe stall then.
3150 * driver must queue a request (even zlp) or halt ep0
3151 * before the host times out.
3160 if ((dev->quirks & PLX_SUPERSPEED) && dev->enhanced_mode) {
3161 u32 mask = (BIT(ENDPOINT_0_INTERRUPT) |
3162 USB3380_IRQSTAT0_EP_INTR_MASK_IN |
3163 USB3380_IRQSTAT0_EP_INTR_MASK_OUT);
3166 usb338x_handle_ep_intr(dev, stat & mask);
3170 /* endpoint data irq ? */
3171 scratch = stat & 0x7f;
3173 for (num = 0; scratch; num++) {
3176 /* do this endpoint's FIFO and queue need tending? */
3178 if ((scratch & t) == 0)
3183 handle_ep_small(ep);
3188 ep_dbg(dev, "unhandled irqstat0 %08x\n", stat);
3191 #define DMA_INTERRUPTS (BIT(DMA_D_INTERRUPT) | \
3192 BIT(DMA_C_INTERRUPT) | \
3193 BIT(DMA_B_INTERRUPT) | \
3194 BIT(DMA_A_INTERRUPT))
3195 #define PCI_ERROR_INTERRUPTS ( \
3196 BIT(PCI_MASTER_ABORT_RECEIVED_INTERRUPT) | \
3197 BIT(PCI_TARGET_ABORT_RECEIVED_INTERRUPT) | \
3198 BIT(PCI_RETRY_ABORT_INTERRUPT))
3200 static void handle_stat1_irqs(struct net2280 *dev, u32 stat)
3201 __releases(dev->lock)
3202 __acquires(dev->lock)
3204 struct net2280_ep *ep;
3205 u32 tmp, num, mask, scratch;
3207 /* after disconnect there's nothing else to do! */
3208 tmp = BIT(VBUS_INTERRUPT) | BIT(ROOT_PORT_RESET_INTERRUPT);
3209 mask = BIT(SUPER_SPEED) | BIT(HIGH_SPEED) | BIT(FULL_SPEED);
3211 /* VBUS disconnect is indicated by VBUS_PIN and VBUS_INTERRUPT set.
3212 * Root Port Reset is indicated by ROOT_PORT_RESET_INTERRUPT set and
3213 * both HIGH_SPEED and FULL_SPEED clear (as ROOT_PORT_RESET_INTERRUPT
3214 * only indicates a change in the reset state).
3218 bool disconnect = false;
3221 * Ignore disconnects and resets if the speed hasn't been set.
3222 * VBUS can bounce and there's always an initial reset.
3224 writel(tmp, &dev->regs->irqstat1);
3225 if (dev->gadget.speed != USB_SPEED_UNKNOWN) {
3226 if ((stat & BIT(VBUS_INTERRUPT)) &&
3227 (readl(&dev->usb->usbctl) &
3228 BIT(VBUS_PIN)) == 0) {
3230 ep_dbg(dev, "disconnect %s\n",
3231 dev->driver->driver.name);
3232 } else if ((stat & BIT(ROOT_PORT_RESET_INTERRUPT)) &&
3233 (readl(&dev->usb->usbstat) & mask)
3236 ep_dbg(dev, "reset %s\n",
3237 dev->driver->driver.name);
3240 if (disconnect || reset) {
3241 stop_activity(dev, dev->driver);
3243 spin_unlock(&dev->lock);
3245 usb_gadget_udc_reset
3246 (&dev->gadget, dev->driver);
3248 (dev->driver->disconnect)
3250 spin_lock(&dev->lock);
3256 /* vBUS can bounce ... one of many reasons to ignore the
3257 * notion of hotplug events on bus connect/disconnect!
3263 /* NOTE: chip stays in PCI D0 state for now, but it could
3264 * enter D1 to save more power
3266 tmp = BIT(SUSPEND_REQUEST_CHANGE_INTERRUPT);
3268 writel(tmp, &dev->regs->irqstat1);
3269 if (stat & BIT(SUSPEND_REQUEST_INTERRUPT)) {
3270 if (dev->driver->suspend)
3271 dev->driver->suspend(&dev->gadget);
3272 if (!enable_suspend)
3273 stat &= ~BIT(SUSPEND_REQUEST_INTERRUPT);
3275 if (dev->driver->resume)
3276 dev->driver->resume(&dev->gadget);
3277 /* at high speed, note erratum 0133 */
3282 /* clear any other status/irqs */
3284 writel(stat, &dev->regs->irqstat1);
3286 /* some status we can just ignore */
3287 if (dev->quirks & PLX_2280)
3288 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3289 BIT(SUSPEND_REQUEST_INTERRUPT) |
3290 BIT(RESUME_INTERRUPT) |
3291 BIT(SOF_INTERRUPT));
3293 stat &= ~(BIT(CONTROL_STATUS_INTERRUPT) |
3294 BIT(RESUME_INTERRUPT) |
3295 BIT(SOF_DOWN_INTERRUPT) |
3296 BIT(SOF_INTERRUPT));
3300 /* ep_dbg(dev, "irqstat1 %08x\n", stat);*/
3302 /* DMA status, for ep-{a,b,c,d} */
3303 scratch = stat & DMA_INTERRUPTS;
3304 stat &= ~DMA_INTERRUPTS;
3306 for (num = 0; scratch; num++) {
3307 struct net2280_dma_regs __iomem *dma;
3310 if ((tmp & scratch) == 0)
3314 ep = &dev->ep[num + 1];
3320 /* clear ep's dma status */
3321 tmp = readl(&dma->dmastat);
3322 writel(tmp, &dma->dmastat);
3325 if (dev->quirks & PLX_SUPERSPEED) {
3326 u32 r_dmacount = readl(&dma->dmacount);
3327 if (!ep->is_in && (r_dmacount & 0x00FFFFFF) &&
3328 (tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT)))
3332 if (!(tmp & BIT(DMA_TRANSACTION_DONE_INTERRUPT))) {
3333 ep_dbg(ep->dev, "%s no xact done? %08x\n",
3339 /* OUT transfers terminate when the data from the
3340 * host is in our memory. Process whatever's done.
3341 * On this path, we know transfer's last packet wasn't
3342 * less than req->length. NAK_OUT_PACKETS may be set,
3343 * or the FIFO may already be holding new packets.
3345 * IN transfers can linger in the FIFO for a very
3346 * long time ... we ignore that for now, accounting
3347 * precisely (like PIO does) needs per-packet irqs
3349 scan_dma_completions(ep);
3351 /* disable dma on inactive queues; else maybe restart */
3352 if (!list_empty(&ep->queue)) {
3353 tmp = readl(&dma->dmactl);
3359 /* NOTE: there are other PCI errors we might usefully notice.
3360 * if they appear very often, here's where to try recovering.
3362 if (stat & PCI_ERROR_INTERRUPTS) {
3363 ep_err(dev, "pci dma error; stat %08x\n", stat);
3364 stat &= ~PCI_ERROR_INTERRUPTS;
3365 /* these are fatal errors, but "maybe" they won't
3368 stop_activity(dev, dev->driver);
3374 ep_dbg(dev, "unhandled irqstat1 %08x\n", stat);
3377 static irqreturn_t net2280_irq(int irq, void *_dev)
3379 struct net2280 *dev = _dev;
3381 /* shared interrupt, not ours */
3382 if ((dev->quirks & PLX_LEGACY) &&
3383 (!(readl(&dev->regs->irqstat0) & BIT(INTA_ASSERTED))))
3386 spin_lock(&dev->lock);
3388 /* handle disconnect, dma, and more */
3389 handle_stat1_irqs(dev, readl(&dev->regs->irqstat1));
3391 /* control requests and PIO */
3392 handle_stat0_irqs(dev, readl(&dev->regs->irqstat0));
3394 if (dev->quirks & PLX_SUPERSPEED) {
3395 /* re-enable interrupt to trigger any possible new interrupt */
3396 u32 pciirqenb1 = readl(&dev->regs->pciirqenb1);
3397 writel(pciirqenb1 & 0x7FFFFFFF, &dev->regs->pciirqenb1);
3398 writel(pciirqenb1, &dev->regs->pciirqenb1);
3401 spin_unlock(&dev->lock);
3406 /*-------------------------------------------------------------------------*/
3408 static void gadget_release(struct device *_dev)
3410 struct net2280 *dev = dev_get_drvdata(_dev);
3415 /* tear down the binding between this driver and the pci device */
3417 static void net2280_remove(struct pci_dev *pdev)
3419 struct net2280 *dev = pci_get_drvdata(pdev);
3421 usb_del_gadget_udc(&dev->gadget);
3423 BUG_ON(dev->driver);
3425 /* then clean up the resources we allocated during probe() */
3426 net2280_led_shutdown(dev);
3427 if (dev->requests) {
3429 for (i = 1; i < 5; i++) {
3430 if (!dev->ep[i].dummy)
3432 pci_pool_free(dev->requests, dev->ep[i].dummy,
3435 pci_pool_destroy(dev->requests);
3438 free_irq(pdev->irq, dev);
3439 if (dev->quirks & PLX_SUPERSPEED)
3440 pci_disable_msi(pdev);
3444 release_mem_region(pci_resource_start(pdev, 0),
3445 pci_resource_len(pdev, 0));
3447 pci_disable_device(pdev);
3448 device_remove_file(&pdev->dev, &dev_attr_registers);
3450 ep_info(dev, "unbind\n");
3453 /* wrap this driver around the specified device, but
3454 * don't respond over USB until a gadget driver binds to us.
3457 static int net2280_probe(struct pci_dev *pdev, const struct pci_device_id *id)
3459 struct net2280 *dev;
3460 unsigned long resource, len;
3461 void __iomem *base = NULL;
3464 /* alloc, and start init */
3465 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
3471 pci_set_drvdata(pdev, dev);
3472 spin_lock_init(&dev->lock);
3473 dev->quirks = id->driver_data;
3475 dev->gadget.ops = &net2280_ops;
3476 dev->gadget.max_speed = (dev->quirks & PLX_SUPERSPEED) ?
3477 USB_SPEED_SUPER : USB_SPEED_HIGH;
3479 /* the "gadget" abstracts/virtualizes the controller */
3480 dev->gadget.name = driver_name;
3482 /* now all the pci goodies ... */
3483 if (pci_enable_device(pdev) < 0) {
3489 /* BAR 0 holds all the registers
3490 * BAR 1 is 8051 memory; unused here (note erratum 0103)
3491 * BAR 2 is fifo memory; unused here
3493 resource = pci_resource_start(pdev, 0);
3494 len = pci_resource_len(pdev, 0);
3495 if (!request_mem_region(resource, len, driver_name)) {
3496 ep_dbg(dev, "controller already in use\n");
3502 /* FIXME provide firmware download interface to put
3503 * 8051 code into the chip, e.g. to turn on PCI PM.
3506 base = ioremap_nocache(resource, len);
3508 ep_dbg(dev, "can't map memory\n");
3512 dev->regs = (struct net2280_regs __iomem *) base;
3513 dev->usb = (struct net2280_usb_regs __iomem *) (base + 0x0080);
3514 dev->pci = (struct net2280_pci_regs __iomem *) (base + 0x0100);
3515 dev->dma = (struct net2280_dma_regs __iomem *) (base + 0x0180);
3516 dev->dep = (struct net2280_dep_regs __iomem *) (base + 0x0200);
3517 dev->epregs = (struct net2280_ep_regs __iomem *) (base + 0x0300);
3519 if (dev->quirks & PLX_SUPERSPEED) {
3522 dev->usb_ext = (struct usb338x_usb_ext_regs __iomem *)
3524 dev->llregs = (struct usb338x_ll_regs __iomem *)
3526 dev->ll_lfps_regs = (struct usb338x_ll_lfps_regs __iomem *)
3528 dev->ll_tsn_regs = (struct usb338x_ll_tsn_regs __iomem *)
3530 dev->ll_chicken_reg = (struct usb338x_ll_chi_regs __iomem *)
3532 dev->plregs = (struct usb338x_pl_regs __iomem *)
3534 usbstat = readl(&dev->usb->usbstat);
3535 dev->enhanced_mode = !!(usbstat & BIT(11));
3536 dev->n_ep = (dev->enhanced_mode) ? 9 : 5;
3537 /* put into initial config, link up all endpoints */
3538 fsmvalue = get_idx_reg(dev->regs, SCRATCH) &
3539 (0xf << DEFECT7374_FSM_FIELD);
3540 /* See if firmware needs to set up for workaround: */
3541 if (fsmvalue == DEFECT7374_FSM_SS_CONTROL_READ) {
3542 dev->bug7734_patched = 1;
3543 writel(0, &dev->usb->usbctl);
3545 dev->bug7734_patched = 0;
3547 dev->enhanced_mode = 0;
3549 /* put into initial config, link up all endpoints */
3550 writel(0, &dev->usb->usbctl);
3556 /* irq setup after old hardware is cleaned up */
3558 ep_err(dev, "No IRQ. Check PCI setup!\n");
3563 if (dev->quirks & PLX_SUPERSPEED)
3564 if (pci_enable_msi(pdev))
3565 ep_err(dev, "Failed to enable MSI mode\n");
3567 if (request_irq(pdev->irq, net2280_irq, IRQF_SHARED,
3568 driver_name, dev)) {
3569 ep_err(dev, "request interrupt %d failed\n", pdev->irq);
3576 /* NOTE: we know only the 32 LSBs of dma addresses may be nonzero */
3577 dev->requests = pci_pool_create("requests", pdev,
3578 sizeof(struct net2280_dma),
3579 0 /* no alignment requirements */,
3580 0 /* or page-crossing issues */);
3581 if (!dev->requests) {
3582 ep_dbg(dev, "can't get request pool\n");
3586 for (i = 1; i < 5; i++) {
3587 struct net2280_dma *td;
3589 td = pci_pool_alloc(dev->requests, GFP_KERNEL,
3590 &dev->ep[i].td_dma);
3592 ep_dbg(dev, "can't get dummy %d\n", i);
3596 td->dmacount = 0; /* not VALID */
3597 td->dmadesc = td->dmaaddr;
3598 dev->ep[i].dummy = td;
3601 /* enable lower-overhead pci memory bursts during DMA */
3602 if (dev->quirks & PLX_LEGACY)
3603 writel(BIT(DMA_MEMORY_WRITE_AND_INVALIDATE_ENABLE) |
3605 * 256 write retries may not be enough...
3606 BIT(PCI_RETRY_ABORT_ENABLE) |
3608 BIT(DMA_READ_MULTIPLE_ENABLE) |
3609 BIT(DMA_READ_LINE_ENABLE),
3610 &dev->pci->pcimstctl);
3611 /* erratum 0115 shouldn't appear: Linux inits PCI_LATENCY_TIMER */
3612 pci_set_master(pdev);
3613 pci_try_set_mwi(pdev);
3615 /* ... also flushes any posted pci writes */
3616 dev->chiprev = get_idx_reg(dev->regs, REG_CHIPREV) & 0xffff;
3619 ep_info(dev, "%s\n", driver_desc);
3620 ep_info(dev, "irq %d, pci mem %p, chip rev %04x\n",
3621 pdev->irq, base, dev->chiprev);
3622 ep_info(dev, "version: " DRIVER_VERSION "; %s\n",
3623 dev->enhanced_mode ? "enhanced mode" : "legacy mode");
3624 retval = device_create_file(&pdev->dev, &dev_attr_registers);
3628 retval = usb_add_gadget_udc_release(&pdev->dev, &dev->gadget,
3636 net2280_remove(pdev);
3640 /* make sure the board is quiescent; otherwise it will continue
3641 * generating IRQs across the upcoming reboot.
3644 static void net2280_shutdown(struct pci_dev *pdev)
3646 struct net2280 *dev = pci_get_drvdata(pdev);
3649 writel(0, &dev->regs->pciirqenb0);
3650 writel(0, &dev->regs->pciirqenb1);
3652 /* disable the pullup so the host will think we're gone */
3653 writel(0, &dev->usb->usbctl);
3658 /*-------------------------------------------------------------------------*/
3660 static const struct pci_device_id pci_ids[] = { {
3661 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3663 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3665 .subvendor = PCI_ANY_ID,
3666 .subdevice = PCI_ANY_ID,
3667 .driver_data = PLX_LEGACY | PLX_2280,
3669 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3671 .vendor = PCI_VENDOR_ID_PLX_LEGACY,
3673 .subvendor = PCI_ANY_ID,
3674 .subdevice = PCI_ANY_ID,
3675 .driver_data = PLX_LEGACY,
3678 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3680 .vendor = PCI_VENDOR_ID_PLX,
3682 .subvendor = PCI_ANY_ID,
3683 .subdevice = PCI_ANY_ID,
3684 .driver_data = PLX_SUPERSPEED,
3687 .class = ((PCI_CLASS_SERIAL_USB << 8) | 0xfe),
3689 .vendor = PCI_VENDOR_ID_PLX,
3691 .subvendor = PCI_ANY_ID,
3692 .subdevice = PCI_ANY_ID,
3693 .driver_data = PLX_SUPERSPEED,
3695 { /* end: all zeroes */ }
3697 MODULE_DEVICE_TABLE(pci, pci_ids);
3699 /* pci driver glue; this is a "new style" PCI driver module */
3700 static struct pci_driver net2280_pci_driver = {
3701 .name = (char *) driver_name,
3702 .id_table = pci_ids,
3704 .probe = net2280_probe,
3705 .remove = net2280_remove,
3706 .shutdown = net2280_shutdown,
3708 /* FIXME add power management support */
3711 module_pci_driver(net2280_pci_driver);
3713 MODULE_DESCRIPTION(DRIVER_DESC);
3714 MODULE_AUTHOR("David Brownell");
3715 MODULE_LICENSE("GPL");