1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 **-----------------------------------------------------------------------------
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/slab.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/init.h>
126 #include <linux/proc_fs.h>
127 #include <linux/blkdev.h>
128 #include <linux/module.h>
129 #include <linux/interrupt.h>
130 #include <linux/device.h>
133 #include <asm/pgtable.h>
134 #include <asm/byteorder.h>
136 #include <scsi/scsi.h>
137 #include <scsi/scsi_cmnd.h>
138 #include <scsi/scsi_dbg.h>
139 #include <scsi/scsi_eh.h>
140 #include <scsi/scsi_host.h>
141 #include <scsi/scsi_tcq.h>
142 #include <scsi/scsi_transport.h>
143 #include <scsi/scsi_transport_spi.h>
147 /* NOTE: For 64 bit drivers there are points in the code where we use
148 * a non dereferenceable pointer to point to a structure in dma-able
149 * memory (which is 32 bits) so that we can use all of the structure
150 * operations but take the address at the end. This macro allows us
151 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 #define to32bit(x) ((__u32)((unsigned long)(x)))
158 #define STATIC static
161 MODULE_AUTHOR("James Bottomley");
162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
163 MODULE_LICENSE("GPL");
165 /* This is the script */
166 #include "53c700_d.h"
169 STATIC int NCR_700_queuecommand(struct Scsi_Host *h, struct scsi_cmnd *);
170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
180 STATIC struct device_attribute *NCR_700_dev_attrs[];
182 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
184 static char *NCR_700_phase[] = {
187 "before command phase",
188 "after command phase",
189 "after status phase",
190 "after data in phase",
191 "after data out phase",
195 static char *NCR_700_condition[] = {
203 "REJECT_MSG RECEIVED",
204 "DISCONNECT_MSG RECEIVED",
210 static char *NCR_700_fatal_messages[] = {
211 "unexpected message after reselection",
212 "still MSG_OUT after message injection",
213 "not MSG_IN after selection",
214 "Illegal message length received",
217 static char *NCR_700_SBCL_bits[] = {
228 static char *NCR_700_SBCL_to_phase[] = {
239 /* This translates the SDTR message offset and period to a value
240 * which can be loaded into the SXFER_REG.
242 * NOTE: According to SCSI-2, the true transfer period (in ns) is
243 * actually four times this period value */
245 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
246 __u8 offset, __u8 period)
250 __u8 min_xferp = (hostdata->chip710
251 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
252 __u8 max_offset = (hostdata->chip710
253 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
258 if(period < hostdata->min_period) {
259 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
260 period = hostdata->min_period;
262 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
263 if(offset > max_offset) {
264 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
268 if(XFERP < min_xferp) {
271 return (offset & 0x0f) | (XFERP & 0x07)<<4;
275 NCR_700_get_SXFER(struct scsi_device *SDp)
277 struct NCR_700_Host_Parameters *hostdata =
278 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
280 return NCR_700_offset_period_to_sxfer(hostdata,
281 spi_offset(SDp->sdev_target),
282 spi_period(SDp->sdev_target));
286 NCR_700_detect(struct scsi_host_template *tpnt,
287 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
289 dma_addr_t pScript, pSlots;
292 struct Scsi_Host *host;
293 static int banner = 0;
296 if(tpnt->sdev_attrs == NULL)
297 tpnt->sdev_attrs = NCR_700_dev_attrs;
299 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
300 &pScript, GFP_KERNEL);
302 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
306 script = (__u32 *)memory;
307 hostdata->msgin = memory + MSGIN_OFFSET;
308 hostdata->msgout = memory + MSGOUT_OFFSET;
309 hostdata->status = memory + STATUS_OFFSET;
310 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
313 pSlots = pScript + SLOTS_OFFSET;
315 /* Fill in the missing routines from the host template */
316 tpnt->queuecommand = NCR_700_queuecommand;
317 tpnt->eh_abort_handler = NCR_700_abort;
318 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
319 tpnt->eh_host_reset_handler = NCR_700_host_reset;
320 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
321 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
322 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
323 tpnt->use_clustering = ENABLE_CLUSTERING;
324 tpnt->slave_configure = NCR_700_slave_configure;
325 tpnt->slave_destroy = NCR_700_slave_destroy;
326 tpnt->slave_alloc = NCR_700_slave_alloc;
327 tpnt->change_queue_depth = NCR_700_change_queue_depth;
328 tpnt->use_blk_tags = 1;
330 if(tpnt->name == NULL)
331 tpnt->name = "53c700";
332 if(tpnt->proc_name == NULL)
333 tpnt->proc_name = "53c700";
335 host = scsi_host_alloc(tpnt, 4);
338 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
339 * NCR_700_COMMAND_SLOTS_PER_HOST);
340 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
341 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
342 - (unsigned long)&hostdata->slots[0].SG[0]);
343 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
345 hostdata->free_list = &hostdata->slots[j];
347 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
348 hostdata->slots[j].state = NCR_700_SLOT_FREE;
351 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
352 script[j] = bS_to_host(SCRIPT[j]);
354 /* adjust all labels to be bus physical */
355 for (j = 0; j < PATCHES; j++)
356 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
357 /* now patch up fixed addresses. */
358 script_patch_32(hostdata->dev, script, MessageLocation,
359 pScript + MSGOUT_OFFSET);
360 script_patch_32(hostdata->dev, script, StatusAddress,
361 pScript + STATUS_OFFSET);
362 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
363 pScript + MSGIN_OFFSET);
365 hostdata->script = script;
366 hostdata->pScript = pScript;
367 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
368 hostdata->state = NCR_700_HOST_FREE;
369 hostdata->cmd = NULL;
371 host->max_lun = NCR_700_MAX_LUNS;
372 BUG_ON(NCR_700_transport_template == NULL);
373 host->transportt = NCR_700_transport_template;
374 host->unique_id = (unsigned long)hostdata->base;
375 hostdata->eh_complete = NULL;
376 host->hostdata[0] = (unsigned long)hostdata;
378 NCR_700_writeb(0xff, host, CTEST9_REG);
379 if (hostdata->chip710)
380 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
382 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
383 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
385 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
388 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
389 hostdata->chip710 ? "53c710" :
390 (hostdata->fast ? "53c700-66" : "53c700"),
391 hostdata->rev, hostdata->differential ?
392 "(Differential)" : "");
394 NCR_700_chip_reset(host);
396 if (scsi_add_host(host, dev)) {
397 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
402 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
409 NCR_700_release(struct Scsi_Host *host)
411 struct NCR_700_Host_Parameters *hostdata =
412 (struct NCR_700_Host_Parameters *)host->hostdata[0];
414 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
415 hostdata->script, hostdata->pScript);
420 NCR_700_identify(int can_disconnect, __u8 lun)
422 return IDENTIFY_BASE |
423 ((can_disconnect) ? 0x40 : 0) |
424 (lun & NCR_700_LUN_MASK);
428 * Function : static int data_residual (Scsi_Host *host)
430 * Purpose : return residual data count of what's in the chip. If you
431 * really want to know what this function is doing, it's almost a
432 * direct transcription of the algorithm described in the 53c710
433 * guide, except that the DBC and DFIFO registers are only 6 bits
436 * Inputs : host - SCSI host */
438 NCR_700_data_residual (struct Scsi_Host *host) {
439 struct NCR_700_Host_Parameters *hostdata =
440 (struct NCR_700_Host_Parameters *)host->hostdata[0];
441 int count, synchronous = 0;
444 if(hostdata->chip710) {
445 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
446 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
448 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
449 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
453 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
455 /* get the data direction */
456 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
461 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
463 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
467 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
468 if (sstat & SODL_REG_FULL)
470 if (synchronous && (sstat & SODR_REG_FULL))
475 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
480 /* print out the SCSI wires and corresponding phase from the SBCL register
483 sbcl_to_string(__u8 sbcl)
486 static char ret[256];
491 strcat(ret, NCR_700_SBCL_bits[i]);
493 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
498 bitmap_to_number(__u8 bitmap)
502 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
507 /* Pull a slot off the free list */
508 STATIC struct NCR_700_command_slot *
509 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
511 struct NCR_700_command_slot *slot = hostdata->free_list;
515 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
516 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
520 if(slot->state != NCR_700_SLOT_FREE)
522 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
525 hostdata->free_list = slot->ITL_forw;
526 slot->ITL_forw = NULL;
529 /* NOTE: set the state to busy here, not queued, since this
530 * indicates the slot is in use and cannot be run by the IRQ
531 * finish routine. If we cannot queue the command when it
532 * is properly build, we then change to NCR_700_SLOT_QUEUED */
533 slot->state = NCR_700_SLOT_BUSY;
535 hostdata->command_slot_count++;
541 free_slot(struct NCR_700_command_slot *slot,
542 struct NCR_700_Host_Parameters *hostdata)
544 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
545 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
547 if(slot->state == NCR_700_SLOT_FREE) {
548 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
551 slot->resume_offset = 0;
553 slot->state = NCR_700_SLOT_FREE;
554 slot->ITL_forw = hostdata->free_list;
555 hostdata->free_list = slot;
556 hostdata->command_slot_count--;
560 /* This routine really does very little. The command is indexed on
561 the ITL and (if tagged) the ITLQ lists in _queuecommand */
563 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
564 struct scsi_cmnd *SCp, __u32 dsp)
566 /* Its just possible that this gets executed twice */
568 struct NCR_700_command_slot *slot =
569 (struct NCR_700_command_slot *)SCp->host_scribble;
571 slot->resume_offset = dsp;
573 hostdata->state = NCR_700_HOST_FREE;
574 hostdata->cmd = NULL;
578 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
579 struct NCR_700_command_slot *slot)
581 if(SCp->sc_data_direction != DMA_NONE &&
582 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
587 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
588 struct scsi_cmnd *SCp, int result)
590 hostdata->state = NCR_700_HOST_FREE;
591 hostdata->cmd = NULL;
594 struct NCR_700_command_slot *slot =
595 (struct NCR_700_command_slot *)SCp->host_scribble;
597 dma_unmap_single(hostdata->dev, slot->pCmd,
598 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
599 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
600 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
602 dma_unmap_single(hostdata->dev, slot->dma_handle,
603 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
604 /* restore the old result if the request sense was
608 /* restore the original length */
609 SCp->cmd_len = cmnd[8];
611 NCR_700_unmap(hostdata, SCp, slot);
613 free_slot(slot, hostdata);
615 if(NCR_700_get_depth(SCp->device) == 0 ||
616 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
617 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
618 NCR_700_get_depth(SCp->device));
619 #endif /* NCR_700_DEBUG */
620 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
622 SCp->host_scribble = NULL;
623 SCp->result = result;
626 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
632 NCR_700_internal_bus_reset(struct Scsi_Host *host)
635 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
637 NCR_700_writeb(0, host, SCNTL1_REG);
642 NCR_700_chip_setup(struct Scsi_Host *host)
644 struct NCR_700_Host_Parameters *hostdata =
645 (struct NCR_700_Host_Parameters *)host->hostdata[0];
647 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
649 if(hostdata->chip710) {
650 __u8 burst_disable = 0;
651 __u8 burst_length = 0;
653 switch (hostdata->burst_length) {
655 burst_length = BURST_LENGTH_1;
658 burst_length = BURST_LENGTH_2;
661 burst_length = BURST_LENGTH_4;
664 burst_length = BURST_LENGTH_8;
667 burst_disable = BURST_DISABLE;
670 hostdata->dcntl_extra |= COMPAT_700_MODE;
672 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
673 NCR_700_writeb(burst_length | hostdata->dmode_extra,
674 host, DMODE_710_REG);
675 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
676 (hostdata->differential ? DIFF : 0),
678 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
679 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
680 | AUTO_ATN, host, SCNTL0_REG);
682 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
683 host, DMODE_700_REG);
684 NCR_700_writeb(hostdata->differential ?
685 DIFF : 0, host, CTEST7_REG);
687 /* this is for 700-66, does nothing on 700 */
688 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
689 | GENERATE_RECEIVE_PARITY, host,
692 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
693 | PARITY | AUTO_ATN, host, SCNTL0_REG);
697 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
698 NCR_700_writeb(0, host, SBCL_REG);
699 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
701 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
702 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
704 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
705 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
706 if(hostdata->clock > 75) {
707 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
708 /* do the best we can, but the async clock will be out
709 * of spec: sync divider 2, async divider 3 */
710 DEBUG(("53c700: sync 2 async 3\n"));
711 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
712 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
713 hostdata->sync_clock = hostdata->clock/2;
714 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
715 /* sync divider 1.5, async divider 3 */
716 DEBUG(("53c700: sync 1.5 async 3\n"));
717 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
718 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
719 hostdata->sync_clock = hostdata->clock*2;
720 hostdata->sync_clock /= 3;
722 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
723 /* sync divider 1, async divider 2 */
724 DEBUG(("53c700: sync 1 async 2\n"));
725 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
726 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
727 hostdata->sync_clock = hostdata->clock;
728 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
729 /* sync divider 1, async divider 1.5 */
730 DEBUG(("53c700: sync 1 async 1.5\n"));
731 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
732 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
733 hostdata->sync_clock = hostdata->clock;
735 DEBUG(("53c700: sync 1 async 1\n"));
736 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
737 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
738 /* sync divider 1, async divider 1 */
739 hostdata->sync_clock = hostdata->clock;
741 /* Calculate the actual minimum period that can be supported
742 * by our synchronous clock speed. See the 710 manual for
743 * exact details of this calculation which is based on a
744 * setting of the SXFER register */
745 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
746 hostdata->min_period = NCR_700_MIN_PERIOD;
747 if(min_period > NCR_700_MIN_PERIOD)
748 hostdata->min_period = min_period;
752 NCR_700_chip_reset(struct Scsi_Host *host)
754 struct NCR_700_Host_Parameters *hostdata =
755 (struct NCR_700_Host_Parameters *)host->hostdata[0];
756 if(hostdata->chip710) {
757 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
760 NCR_700_writeb(0, host, ISTAT_REG);
762 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
765 NCR_700_writeb(0, host, DCNTL_REG);
770 NCR_700_chip_setup(host);
773 /* The heart of the message processing engine is that the instruction
774 * immediately after the INT is the normal case (and so must be CLEAR
775 * ACK). If we want to do something else, we call that routine in
776 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
777 * ACK) so that the routine returns correctly to resume its activity
780 process_extended_message(struct Scsi_Host *host,
781 struct NCR_700_Host_Parameters *hostdata,
782 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
784 __u32 resume_offset = dsp, temp = dsp + 8;
785 __u8 pun = 0xff, lun = 0xff;
788 pun = SCp->device->id;
789 lun = SCp->device->lun;
792 switch(hostdata->msgin[2]) {
794 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
795 struct scsi_target *starget = SCp->device->sdev_target;
796 __u8 period = hostdata->msgin[3];
797 __u8 offset = hostdata->msgin[4];
799 if(offset == 0 || period == 0) {
804 spi_offset(starget) = offset;
805 spi_period(starget) = period;
807 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
808 spi_display_xfer_agreement(starget);
809 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
812 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
813 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
815 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
819 /* SDTR message out of the blue, reject it */
820 shost_printk(KERN_WARNING, host,
821 "Unexpected SDTR msg\n");
822 hostdata->msgout[0] = A_REJECT_MSG;
823 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
824 script_patch_16(hostdata->dev, hostdata->script,
826 /* SendMsgOut returns, so set up the return
828 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
833 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
834 host->host_no, pun, lun);
835 hostdata->msgout[0] = A_REJECT_MSG;
836 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
837 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
839 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
844 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
845 host->host_no, pun, lun,
846 NCR_700_phase[(dsps & 0xf00) >> 8]);
847 spi_print_msg(hostdata->msgin);
850 hostdata->msgout[0] = A_REJECT_MSG;
851 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
852 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
854 /* SendMsgOut returns, so set up the return
856 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
858 NCR_700_writel(temp, host, TEMP_REG);
859 return resume_offset;
863 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
864 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
866 /* work out where to return to */
867 __u32 temp = dsp + 8, resume_offset = dsp;
868 __u8 pun = 0xff, lun = 0xff;
871 pun = SCp->device->id;
872 lun = SCp->device->lun;
876 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
877 NCR_700_phase[(dsps & 0xf00) >> 8]);
878 spi_print_msg(hostdata->msgin);
882 switch(hostdata->msgin[0]) {
885 resume_offset = process_extended_message(host, hostdata, SCp,
890 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
891 /* Rejected our sync negotiation attempt */
892 spi_period(SCp->device->sdev_target) =
893 spi_offset(SCp->device->sdev_target) = 0;
894 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
895 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
896 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
897 /* rejected our first simple tag message */
898 scmd_printk(KERN_WARNING, SCp,
899 "Rejected first tag queue attempt, turning off tag queueing\n");
900 /* we're done negotiating */
901 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
902 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
904 SCp->device->tagged_supported = 0;
905 SCp->device->simple_tags = 0;
906 scsi_change_queue_depth(SCp->device, host->cmd_per_lun);
908 shost_printk(KERN_WARNING, host,
909 "(%d:%d) Unexpected REJECT Message %s\n",
911 NCR_700_phase[(dsps & 0xf00) >> 8]);
912 /* however, just ignore it */
916 case A_PARITY_ERROR_MSG:
917 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
919 NCR_700_internal_bus_reset(host);
921 case A_SIMPLE_TAG_MSG:
922 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
923 pun, lun, hostdata->msgin[1],
924 NCR_700_phase[(dsps & 0xf00) >> 8]);
928 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
929 host->host_no, pun, lun,
930 NCR_700_phase[(dsps & 0xf00) >> 8]);
932 spi_print_msg(hostdata->msgin);
935 hostdata->msgout[0] = A_REJECT_MSG;
936 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
937 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
939 /* SendMsgOut returns, so set up the return
941 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
945 NCR_700_writel(temp, host, TEMP_REG);
946 /* set us up to receive another message */
947 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
948 return resume_offset;
952 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
953 struct Scsi_Host *host,
954 struct NCR_700_Host_Parameters *hostdata)
956 __u32 resume_offset = 0;
957 __u8 pun = 0xff, lun=0xff;
960 pun = SCp->device->id;
961 lun = SCp->device->lun;
964 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
965 DEBUG((" COMMAND COMPLETE, status=%02x\n",
966 hostdata->status[0]));
967 /* OK, if TCQ still under negotiation, we now know it works */
968 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
969 NCR_700_set_tag_neg_state(SCp->device,
970 NCR_700_FINISHED_TAG_NEGOTIATION);
972 /* check for contingent allegiance contitions */
973 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
974 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
975 struct NCR_700_command_slot *slot =
976 (struct NCR_700_command_slot *)SCp->host_scribble;
977 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
978 /* OOPS: bad device, returning another
979 * contingent allegiance condition */
980 scmd_printk(KERN_ERR, SCp,
981 "broken device is looping in contingent allegiance: ignoring\n");
982 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
985 NCR_700_get_sense_cmnd(SCp->device);
987 scsi_print_command(SCp);
988 printk(" cmd %p has status %d, requesting sense\n",
989 SCp, hostdata->status[0]);
991 /* we can destroy the command here
992 * because the contingent allegiance
993 * condition will cause a retry which
994 * will re-copy the command from the
995 * saved data_cmnd. We also unmap any
996 * data associated with the command
998 NCR_700_unmap(hostdata, SCp, slot);
999 dma_unmap_single(hostdata->dev, slot->pCmd,
1003 cmnd[0] = REQUEST_SENSE;
1004 cmnd[1] = (lun & 0x7) << 5;
1007 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1009 /* Here's a quiet hack: the
1010 * REQUEST_SENSE command is six bytes,
1011 * so store a flag indicating that
1012 * this was an internal sense request
1013 * and the original status at the end
1015 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1016 cmnd[7] = hostdata->status[0];
1017 cmnd[8] = SCp->cmd_len;
1018 SCp->cmd_len = 6; /* command length for
1020 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1021 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1022 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1023 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1024 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1025 slot->SG[1].pAddr = 0;
1026 slot->resume_offset = hostdata->pScript;
1027 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1028 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1030 /* queue the command for reissue */
1031 slot->state = NCR_700_SLOT_QUEUED;
1032 slot->flags = NCR_700_FLAG_AUTOSENSE;
1033 hostdata->state = NCR_700_HOST_FREE;
1034 hostdata->cmd = NULL;
1037 // Currently rely on the mid layer evaluation
1038 // of the tag queuing capability
1040 //if(status_byte(hostdata->status[0]) == GOOD &&
1041 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1042 // /* Piggy back the tag queueing support
1043 // * on this command */
1044 // dma_sync_single_for_cpu(hostdata->dev,
1045 // slot->dma_handle,
1046 // SCp->request_bufflen,
1047 // DMA_FROM_DEVICE);
1048 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1049 // scmd_printk(KERN_INFO, SCp,
1050 // "Enabling Tag Command Queuing\n");
1051 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1052 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1054 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1055 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1058 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1060 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1061 __u8 i = (dsps & 0xf00) >> 8;
1063 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1065 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1066 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1068 scsi_print_command(SCp);
1070 NCR_700_internal_bus_reset(host);
1071 } else if((dsps & 0xfffff000) == A_FATAL) {
1072 int i = (dsps & 0xfff);
1074 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1075 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1076 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1077 printk(KERN_ERR " msg begins %02x %02x\n",
1078 hostdata->msgin[0], hostdata->msgin[1]);
1080 NCR_700_internal_bus_reset(host);
1081 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1082 #ifdef NCR_700_DEBUG
1083 __u8 i = (dsps & 0xf00) >> 8;
1085 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1086 host->host_no, pun, lun,
1087 i, NCR_700_phase[i]);
1089 save_for_reselection(hostdata, SCp, dsp);
1091 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1093 struct NCR_700_command_slot *slot;
1094 __u8 reselection_id = hostdata->reselection_id;
1095 struct scsi_device *SDp;
1097 lun = hostdata->msgin[0] & 0x1f;
1099 hostdata->reselection_id = 0xff;
1100 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1101 host->host_no, reselection_id, lun));
1102 /* clear the reselection indicator */
1103 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1104 if(unlikely(SDp == NULL)) {
1105 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1106 host->host_no, reselection_id, lun);
1109 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1110 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1111 if(unlikely(SCp == NULL)) {
1112 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1113 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1117 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1118 DDEBUG(KERN_DEBUG, SDp,
1119 "reselection is tag %d, slot %p(%d)\n",
1120 hostdata->msgin[2], slot, slot->tag);
1122 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1123 if(unlikely(SCp == NULL)) {
1124 sdev_printk(KERN_ERR, SDp,
1125 "no saved request for untagged cmd\n");
1128 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1132 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1133 host->host_no, reselection_id, lun,
1134 hostdata->msgin[0], hostdata->msgin[1],
1135 hostdata->msgin[2]);
1137 if(hostdata->state != NCR_700_HOST_BUSY)
1138 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1140 resume_offset = slot->resume_offset;
1141 hostdata->cmd = slot->cmnd;
1143 /* re-patch for this command */
1144 script_patch_32_abs(hostdata->dev, hostdata->script,
1145 CommandAddress, slot->pCmd);
1146 script_patch_16(hostdata->dev, hostdata->script,
1147 CommandCount, slot->cmnd->cmd_len);
1148 script_patch_32_abs(hostdata->dev, hostdata->script,
1149 SGScriptStartAddress,
1150 to32bit(&slot->pSG[0].ins));
1152 /* Note: setting SXFER only works if we're
1153 * still in the MESSAGE phase, so it is vital
1154 * that ACK is still asserted when we process
1155 * the reselection message. The resume offset
1156 * should therefore always clear ACK */
1157 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1159 dma_cache_sync(hostdata->dev, hostdata->msgin,
1160 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1161 dma_cache_sync(hostdata->dev, hostdata->msgout,
1162 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1163 /* I'm just being paranoid here, the command should
1164 * already have been flushed from the cache */
1165 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1166 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1171 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1173 /* This section is full of debugging code because I've
1174 * never managed to reach it. I think what happens is
1175 * that, because the 700 runs with selection
1176 * interrupts enabled the whole time that we take a
1177 * selection interrupt before we manage to get to the
1178 * reselected script interrupt */
1180 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1181 struct NCR_700_command_slot *slot;
1183 /* Take out our own ID */
1184 reselection_id &= ~(1<<host->this_id);
1186 /* I've never seen this happen, so keep this as a printk rather
1188 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1189 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1192 /* FIXME: DEBUGGING CODE */
1193 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1196 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1197 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1198 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1201 printk(KERN_INFO "IDENTIFIED SG segment as being %08x in slot %p, cmd %p, slot->resume_offset=%08x\n", SG, &hostdata->slots[i], hostdata->slots[i].cmnd, hostdata->slots[i].resume_offset);
1202 SCp = hostdata->slots[i].cmnd;
1206 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1207 /* change slot from busy to queued to redo command */
1208 slot->state = NCR_700_SLOT_QUEUED;
1210 hostdata->cmd = NULL;
1212 if(reselection_id == 0) {
1213 if(hostdata->reselection_id == 0xff) {
1214 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1217 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1219 reselection_id = hostdata->reselection_id;
1223 /* convert to real ID */
1224 reselection_id = bitmap_to_number(reselection_id);
1226 hostdata->reselection_id = reselection_id;
1227 /* just in case we have a stale simple tag message, clear it */
1228 hostdata->msgin[1] = 0;
1229 dma_cache_sync(hostdata->dev, hostdata->msgin,
1230 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1231 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1232 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1234 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1236 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1237 /* we've just disconnected from the bus, do nothing since
1238 * a return here will re-run the queued command slot
1239 * that may have been interrupted by the initial selection */
1240 DEBUG((" SELECTION COMPLETED\n"));
1241 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1242 resume_offset = process_message(host, hostdata, SCp,
1244 } else if((dsps & 0xfffff000) == 0) {
1245 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1246 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1247 host->host_no, pun, lun, NCR_700_condition[i],
1248 NCR_700_phase[j], dsp - hostdata->pScript);
1250 struct scatterlist *sg;
1252 scsi_print_command(SCp);
1253 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1254 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1257 NCR_700_internal_bus_reset(host);
1258 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1259 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1260 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1261 resume_offset = dsp;
1263 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1264 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1265 NCR_700_internal_bus_reset(host);
1267 return resume_offset;
1270 /* We run the 53c700 with selection interrupts always enabled. This
1271 * means that the chip may be selected as soon as the bus frees. On a
1272 * busy bus, this can be before the scripts engine finishes its
1273 * processing. Therefore, part of the selection processing has to be
1274 * to find out what the scripts engine is doing and complete the
1275 * function if necessary (i.e. process the pending disconnect or save
1276 * the interrupted initial selection */
1278 process_selection(struct Scsi_Host *host, __u32 dsp)
1280 __u8 id = 0; /* Squash compiler warning */
1282 __u32 resume_offset = 0;
1283 struct NCR_700_Host_Parameters *hostdata =
1284 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1285 struct scsi_cmnd *SCp = hostdata->cmd;
1288 for(count = 0; count < 5; count++) {
1289 id = NCR_700_readb(host, hostdata->chip710 ?
1290 CTEST9_REG : SFBR_REG);
1292 /* Take out our own ID */
1293 id &= ~(1<<host->this_id);
1298 sbcl = NCR_700_readb(host, SBCL_REG);
1299 if((sbcl & SBCL_IO) == 0) {
1300 /* mark as having been selected rather than reselected */
1303 /* convert to real ID */
1304 hostdata->reselection_id = id = bitmap_to_number(id);
1305 DEBUG(("scsi%d: Reselected by %d\n",
1306 host->host_no, id));
1308 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1309 struct NCR_700_command_slot *slot =
1310 (struct NCR_700_command_slot *)SCp->host_scribble;
1311 DEBUG((" ID %d WARNING: RESELECTION OF BUSY HOST, saving cmd %p, slot %p, addr %x [%04x], resume %x!\n", id, hostdata->cmd, slot, dsp, dsp - hostdata->pScript, resume_offset));
1313 switch(dsp - hostdata->pScript) {
1314 case Ent_Disconnect1:
1315 case Ent_Disconnect2:
1316 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1318 case Ent_Disconnect3:
1319 case Ent_Disconnect4:
1320 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1322 case Ent_Disconnect5:
1323 case Ent_Disconnect6:
1324 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1326 case Ent_Disconnect7:
1327 case Ent_Disconnect8:
1328 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1332 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1336 slot->state = NCR_700_SLOT_QUEUED;
1340 hostdata->state = NCR_700_HOST_BUSY;
1341 hostdata->cmd = NULL;
1342 /* clear any stale simple tag message */
1343 hostdata->msgin[1] = 0;
1344 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1348 /* Selected as target, Ignore */
1349 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1350 } else if(hostdata->tag_negotiated & (1<<id)) {
1351 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1353 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1355 return resume_offset;
1359 NCR_700_clear_fifo(struct Scsi_Host *host) {
1360 const struct NCR_700_Host_Parameters *hostdata
1361 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1362 if(hostdata->chip710) {
1363 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1365 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1370 NCR_700_flush_fifo(struct Scsi_Host *host) {
1371 const struct NCR_700_Host_Parameters *hostdata
1372 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1373 if(hostdata->chip710) {
1374 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1376 NCR_700_writeb(0, host, CTEST8_REG);
1378 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1380 NCR_700_writeb(0, host, DFIFO_REG);
1385 /* The queue lock with interrupts disabled must be held on entry to
1388 NCR_700_start_command(struct scsi_cmnd *SCp)
1390 struct NCR_700_command_slot *slot =
1391 (struct NCR_700_command_slot *)SCp->host_scribble;
1392 struct NCR_700_Host_Parameters *hostdata =
1393 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1394 __u16 count = 1; /* for IDENTIFY message */
1395 u8 lun = SCp->device->lun;
1397 if(hostdata->state != NCR_700_HOST_FREE) {
1398 /* keep this inside the lock to close the race window where
1399 * the running command finishes on another CPU while we don't
1400 * change the state to queued on this one */
1401 slot->state = NCR_700_SLOT_QUEUED;
1403 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1404 SCp->device->host->host_no, slot->cmnd, slot));
1407 hostdata->state = NCR_700_HOST_BUSY;
1408 hostdata->cmd = SCp;
1409 slot->state = NCR_700_SLOT_BUSY;
1410 /* keep interrupts disabled until we have the command correctly
1411 * set up so we cannot take a selection interrupt */
1413 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1414 slot->flags != NCR_700_FLAG_AUTOSENSE),
1416 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1417 * if the negotiated transfer parameters still hold, so
1418 * always renegotiate them */
1419 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1420 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1421 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1424 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1425 * If a contingent allegiance condition exists, the device
1426 * will refuse all tags, so send the request sense as untagged
1428 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1429 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1430 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1431 count += spi_populate_tag_msg(&hostdata->msgout[count], SCp);
1434 if(hostdata->fast &&
1435 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1436 count += spi_populate_sync_msg(&hostdata->msgout[count],
1437 spi_period(SCp->device->sdev_target),
1438 spi_offset(SCp->device->sdev_target));
1439 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1442 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1445 script_patch_ID(hostdata->dev, hostdata->script,
1446 Device_ID, 1<<scmd_id(SCp));
1448 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1450 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1452 /* finally plumb the beginning of the SG list into the script
1454 script_patch_32_abs(hostdata->dev, hostdata->script,
1455 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1456 NCR_700_clear_fifo(SCp->device->host);
1458 if(slot->resume_offset == 0)
1459 slot->resume_offset = hostdata->pScript;
1460 /* now perform all the writebacks and invalidates */
1461 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1462 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1464 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1465 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1467 /* set the synchronous period/offset */
1468 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1469 SCp->device->host, SXFER_REG);
1470 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1471 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1477 NCR_700_intr(int irq, void *dev_id)
1479 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1480 struct NCR_700_Host_Parameters *hostdata =
1481 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1483 __u32 resume_offset = 0;
1484 __u8 pun = 0xff, lun = 0xff;
1485 unsigned long flags;
1488 /* Use the host lock to serialise access to the 53c700
1489 * hardware. Note: In future, we may need to take the queue
1490 * lock to enter the done routines. When that happens, we
1491 * need to ensure that for this driver, the host lock and the
1492 * queue lock point to the same thing. */
1493 spin_lock_irqsave(host->host_lock, flags);
1494 if((istat = NCR_700_readb(host, ISTAT_REG))
1495 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1497 __u8 sstat0 = 0, dstat = 0;
1499 struct scsi_cmnd *SCp = hostdata->cmd;
1500 enum NCR_700_Host_State state;
1503 state = hostdata->state;
1504 SCp = hostdata->cmd;
1506 if(istat & SCSI_INT_PENDING) {
1509 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1512 if(istat & DMA_INT_PENDING) {
1515 dstat = NCR_700_readb(host, DSTAT_REG);
1518 dsps = NCR_700_readl(host, DSPS_REG);
1519 dsp = NCR_700_readl(host, DSP_REG);
1521 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1522 host->host_no, istat, sstat0, dstat,
1523 (dsp - (__u32)(hostdata->pScript))/4,
1527 pun = SCp->device->id;
1528 lun = SCp->device->lun;
1531 if(sstat0 & SCSI_RESET_DETECTED) {
1532 struct scsi_device *SDp;
1535 hostdata->state = NCR_700_HOST_BUSY;
1537 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1538 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1540 scsi_report_bus_reset(host, 0);
1542 /* clear all the negotiated parameters */
1543 __shost_for_each_device(SDp, host)
1544 NCR_700_clear_flag(SDp, ~0);
1546 /* clear all the slots and their pending commands */
1547 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1548 struct scsi_cmnd *SCp;
1549 struct NCR_700_command_slot *slot =
1550 &hostdata->slots[i];
1552 if(slot->state == NCR_700_SLOT_FREE)
1556 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1558 free_slot(slot, hostdata);
1559 SCp->host_scribble = NULL;
1560 NCR_700_set_depth(SCp->device, 0);
1561 /* NOTE: deadlock potential here: we
1562 * rely on mid-layer guarantees that
1563 * scsi_done won't try to issue the
1564 * command again otherwise we'll
1566 * hostdata->state_lock */
1567 SCp->result = DID_RESET << 16;
1568 SCp->scsi_done(SCp);
1571 NCR_700_chip_setup(host);
1573 hostdata->state = NCR_700_HOST_FREE;
1574 hostdata->cmd = NULL;
1575 /* signal back if this was an eh induced reset */
1576 if(hostdata->eh_complete != NULL)
1577 complete(hostdata->eh_complete);
1579 } else if(sstat0 & SELECTION_TIMEOUT) {
1580 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1581 host->host_no, pun, lun));
1582 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1583 } else if(sstat0 & PHASE_MISMATCH) {
1584 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1585 (struct NCR_700_command_slot *)SCp->host_scribble;
1587 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1588 /* It wants to reply to some part of
1590 #ifdef NCR_700_DEBUG
1591 __u32 temp = NCR_700_readl(host, TEMP_REG);
1592 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1593 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1595 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1596 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1597 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1598 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1599 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1600 int residual = NCR_700_data_residual(host);
1602 #ifdef NCR_700_DEBUG
1603 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1605 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1606 host->host_no, pun, lun,
1607 SGcount, data_transfer);
1608 scsi_print_command(SCp);
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1611 host->host_no, pun, lun,
1612 SGcount, data_transfer, residual);
1615 data_transfer += residual;
1617 if(data_transfer != 0) {
1623 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1624 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1625 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1626 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1627 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1628 pAddr += (count - data_transfer);
1629 #ifdef NCR_700_DEBUG
1630 if(pAddr != naddr) {
1631 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1634 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1636 /* set the executed moves to nops */
1637 for(i=0; i<SGcount; i++) {
1638 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1639 slot->SG[i].pAddr = 0;
1641 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1642 /* and pretend we disconnected after
1643 * the command phase */
1644 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1645 /* make sure all the data is flushed */
1646 NCR_700_flush_fifo(host);
1648 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1649 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1650 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1651 NCR_700_internal_bus_reset(host);
1654 } else if(sstat0 & SCSI_GROSS_ERROR) {
1655 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1656 host->host_no, pun, lun);
1657 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1658 } else if(sstat0 & PARITY_ERROR) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1660 host->host_no, pun, lun);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(dstat & SCRIPT_INT_RECEIVED) {
1663 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1664 host->host_no, pun, lun));
1665 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1666 } else if(dstat & (ILGL_INST_DETECTED)) {
1667 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1668 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1669 host->host_no, pun, lun,
1670 dsp, dsp - hostdata->pScript);
1671 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1672 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1673 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1674 host->host_no, pun, lun, dstat);
1675 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 /* NOTE: selection interrupt processing MUST occur
1680 * after script interrupt processing to correctly cope
1681 * with the case where we process a disconnect and
1682 * then get reselected before we process the
1684 if(sstat0 & SELECTED) {
1685 /* FIXME: It currently takes at least FOUR
1686 * interrupts to complete a command that
1687 * disconnects: one for the disconnect, one
1688 * for the reselection, one to get the
1689 * reselection data and one to complete the
1690 * command. If we guess the reselected
1691 * command here and prepare it, we only need
1692 * to get a reselection data interrupt if we
1693 * guessed wrongly. Since the interrupt
1694 * overhead is much greater than the command
1695 * setup, this would be an efficient
1696 * optimisation particularly as we probably
1697 * only have one outstanding command on a
1698 * target most of the time */
1700 resume_offset = process_selection(host, dsp);
1707 if(hostdata->state != NCR_700_HOST_BUSY) {
1708 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1709 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1710 hostdata->state = NCR_700_HOST_BUSY;
1713 DEBUG(("Attempting to resume at %x\n", resume_offset));
1714 NCR_700_clear_fifo(host);
1715 NCR_700_writel(resume_offset, host, DSP_REG);
1717 /* There is probably a technical no-no about this: If we're a
1718 * shared interrupt and we got this interrupt because the
1719 * other device needs servicing not us, we're still going to
1720 * check our queued commands here---of course, there shouldn't
1721 * be any outstanding.... */
1722 if(hostdata->state == NCR_700_HOST_FREE) {
1725 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1726 /* fairness: always run the queue from the last
1727 * position we left off */
1728 int j = (i + hostdata->saved_slot_position)
1729 % NCR_700_COMMAND_SLOTS_PER_HOST;
1731 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1733 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1734 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1735 host->host_no, &hostdata->slots[j],
1736 hostdata->slots[j].cmnd));
1737 hostdata->saved_slot_position = j + 1;
1744 spin_unlock_irqrestore(host->host_lock, flags);
1745 return IRQ_RETVAL(handled);
1749 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1751 struct NCR_700_Host_Parameters *hostdata =
1752 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1754 enum dma_data_direction direction;
1755 struct NCR_700_command_slot *slot;
1757 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1758 /* We're over our allocation, this should never happen
1759 * since we report the max allocation to the mid layer */
1760 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1763 /* check for untagged commands. We cannot have any outstanding
1764 * commands if we accept them. Commands could be untagged because:
1766 * - The tag negotiated bitmap is clear
1767 * - The blk layer sent and untagged command
1769 if(NCR_700_get_depth(SCp->device) != 0
1770 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1771 || !(SCp->flags & SCMD_TAGGED))) {
1772 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1773 NCR_700_get_depth(SCp->device));
1774 return SCSI_MLQUEUE_DEVICE_BUSY;
1776 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1777 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1778 NCR_700_get_depth(SCp->device));
1779 return SCSI_MLQUEUE_DEVICE_BUSY;
1781 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1783 /* begin the command here */
1784 /* no need to check for NULL, test for command_slot_count above
1785 * ensures a slot is free */
1786 slot = find_empty_slot(hostdata);
1790 SCp->scsi_done = done;
1791 SCp->host_scribble = (unsigned char *)slot;
1792 SCp->SCp.ptr = NULL;
1793 SCp->SCp.buffer = NULL;
1795 #ifdef NCR_700_DEBUG
1796 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1797 scsi_print_command(SCp);
1799 if ((SCp->flags & SCMD_TAGGED)
1800 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1801 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1802 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1803 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1804 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1807 /* here we may have to process an untagged command. The gate
1808 * above ensures that this will be the only one outstanding,
1809 * so clear the tag negotiated bit.
1811 * FIXME: This will royally screw up on multiple LUN devices
1813 if (!(SCp->flags & SCMD_TAGGED)
1814 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1815 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1816 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1819 if ((hostdata->tag_negotiated & (1<<scmd_id(SCp))) &&
1820 SCp->device->simple_tags) {
1821 slot->tag = SCp->request->tag;
1822 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1825 slot->tag = SCSI_NO_TAG;
1826 /* must populate current_cmnd for scsi_find_tag to work */
1827 SCp->device->current_cmnd = SCp;
1829 /* sanity check: some of the commands generated by the mid-layer
1830 * have an eccentric idea of their sc_data_direction */
1831 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1832 SCp->sc_data_direction != DMA_NONE) {
1833 #ifdef NCR_700_DEBUG
1834 printk("53c700: Command");
1835 scsi_print_command(SCp);
1836 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1838 SCp->sc_data_direction = DMA_NONE;
1841 switch (SCp->cmnd[0]) {
1843 /* clear the internal sense magic */
1847 /* OK, get it from the command */
1848 switch(SCp->sc_data_direction) {
1849 case DMA_BIDIRECTIONAL:
1851 printk(KERN_ERR "53c700: Unknown command for data direction ");
1852 scsi_print_command(SCp);
1859 case DMA_FROM_DEVICE:
1860 move_ins = SCRIPT_MOVE_DATA_IN;
1863 move_ins = SCRIPT_MOVE_DATA_OUT;
1868 /* now build the scatter gather list */
1869 direction = SCp->sc_data_direction;
1873 dma_addr_t vPtr = 0;
1874 struct scatterlist *sg;
1877 sg_count = scsi_dma_map(SCp);
1878 BUG_ON(sg_count < 0);
1880 scsi_for_each_sg(SCp, sg, sg_count, i) {
1881 vPtr = sg_dma_address(sg);
1882 count = sg_dma_len(sg);
1884 slot->SG[i].ins = bS_to_host(move_ins | count);
1885 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1886 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1887 slot->SG[i].pAddr = bS_to_host(vPtr);
1889 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1890 slot->SG[i].pAddr = 0;
1891 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1892 DEBUG((" SETTING %08lx to %x\n",
1893 (&slot->pSG[i].ins),
1896 slot->resume_offset = 0;
1897 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1898 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1899 NCR_700_start_command(SCp);
1903 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1906 NCR_700_abort(struct scsi_cmnd * SCp)
1908 struct NCR_700_command_slot *slot;
1910 scmd_printk(KERN_INFO, SCp, "abort command\n");
1912 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1915 /* no outstanding command to abort */
1917 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1918 /* FIXME: This is because of a problem in the new
1919 * error handler. When it is in error recovery, it
1920 * will send a TUR to a device it thinks may still be
1921 * showing a problem. If the TUR isn't responded to,
1922 * it will abort it and mark the device off line.
1923 * Unfortunately, it does no other error recovery, so
1924 * this would leave us with an outstanding command
1925 * occupying a slot. Rather than allow this to
1926 * happen, we issue a bus reset to force all
1927 * outstanding commands to terminate here. */
1928 NCR_700_internal_bus_reset(SCp->device->host);
1929 /* still drop through and return failed */
1936 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1938 DECLARE_COMPLETION_ONSTACK(complete);
1939 struct NCR_700_Host_Parameters *hostdata =
1940 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1942 scmd_printk(KERN_INFO, SCp,
1943 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1944 scsi_print_command(SCp);
1946 /* In theory, eh_complete should always be null because the
1947 * eh is single threaded, but just in case we're handling a
1948 * reset via sg or something */
1949 spin_lock_irq(SCp->device->host->host_lock);
1950 while (hostdata->eh_complete != NULL) {
1951 spin_unlock_irq(SCp->device->host->host_lock);
1952 msleep_interruptible(100);
1953 spin_lock_irq(SCp->device->host->host_lock);
1956 hostdata->eh_complete = &complete;
1957 NCR_700_internal_bus_reset(SCp->device->host);
1959 spin_unlock_irq(SCp->device->host->host_lock);
1960 wait_for_completion(&complete);
1961 spin_lock_irq(SCp->device->host->host_lock);
1963 hostdata->eh_complete = NULL;
1964 /* Revalidate the transport parameters of the failing device */
1966 spi_schedule_dv_device(SCp->device);
1968 spin_unlock_irq(SCp->device->host->host_lock);
1973 NCR_700_host_reset(struct scsi_cmnd * SCp)
1975 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1976 scsi_print_command(SCp);
1978 spin_lock_irq(SCp->device->host->host_lock);
1980 NCR_700_internal_bus_reset(SCp->device->host);
1981 NCR_700_chip_reset(SCp->device->host);
1983 spin_unlock_irq(SCp->device->host->host_lock);
1989 NCR_700_set_period(struct scsi_target *STp, int period)
1991 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1992 struct NCR_700_Host_Parameters *hostdata =
1993 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
1998 if(period < hostdata->min_period)
1999 period = hostdata->min_period;
2001 spi_period(STp) = period;
2002 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2003 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2004 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2008 NCR_700_set_offset(struct scsi_target *STp, int offset)
2010 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2011 struct NCR_700_Host_Parameters *hostdata =
2012 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2013 int max_offset = hostdata->chip710
2014 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2019 if(offset > max_offset)
2020 offset = max_offset;
2022 /* if we're currently async, make sure the period is reasonable */
2023 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2024 spi_period(STp) > 0xff))
2025 spi_period(STp) = hostdata->min_period;
2027 spi_offset(STp) = offset;
2028 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2029 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2030 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2034 NCR_700_slave_alloc(struct scsi_device *SDp)
2036 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2046 NCR_700_slave_configure(struct scsi_device *SDp)
2048 struct NCR_700_Host_Parameters *hostdata =
2049 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2051 /* to do here: allocate memory; build a queue_full list */
2052 if(SDp->tagged_supported) {
2053 scsi_change_queue_depth(SDp, NCR_700_DEFAULT_TAGS);
2054 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2057 if(hostdata->fast) {
2058 /* Find the correct offset and period via domain validation */
2059 if (!spi_initial_dv(SDp->sdev_target))
2062 spi_offset(SDp->sdev_target) = 0;
2063 spi_period(SDp->sdev_target) = 0;
2069 NCR_700_slave_destroy(struct scsi_device *SDp)
2071 kfree(SDp->hostdata);
2072 SDp->hostdata = NULL;
2076 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2078 if (depth > NCR_700_MAX_TAGS)
2079 depth = NCR_700_MAX_TAGS;
2080 return scsi_change_queue_depth(SDp, depth);
2084 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2086 struct scsi_device *SDp = to_scsi_device(dev);
2088 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2091 static struct device_attribute NCR_700_active_tags_attr = {
2093 .name = "active_tags",
2096 .show = NCR_700_show_active_tags,
2099 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2100 &NCR_700_active_tags_attr,
2104 EXPORT_SYMBOL(NCR_700_detect);
2105 EXPORT_SYMBOL(NCR_700_release);
2106 EXPORT_SYMBOL(NCR_700_intr);
2108 static struct spi_function_template NCR_700_transport_functions = {
2109 .set_period = NCR_700_set_period,
2111 .set_offset = NCR_700_set_offset,
2115 static int __init NCR_700_init(void)
2117 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2118 if(!NCR_700_transport_template)
2123 static void __exit NCR_700_exit(void)
2125 spi_release_transport(NCR_700_transport_template);
2128 module_init(NCR_700_init);
2129 module_exit(NCR_700_exit);