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, int reason);
179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181 STATIC struct device_attribute *NCR_700_dev_attrs[];
183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185 static char *NCR_700_phase[] = {
188 "before command phase",
189 "after command phase",
190 "after status phase",
191 "after data in phase",
192 "after data out phase",
196 static char *NCR_700_condition[] = {
204 "REJECT_MSG RECEIVED",
205 "DISCONNECT_MSG RECEIVED",
211 static char *NCR_700_fatal_messages[] = {
212 "unexpected message after reselection",
213 "still MSG_OUT after message injection",
214 "not MSG_IN after selection",
215 "Illegal message length received",
218 static char *NCR_700_SBCL_bits[] = {
229 static char *NCR_700_SBCL_to_phase[] = {
240 /* This translates the SDTR message offset and period to a value
241 * which can be loaded into the SXFER_REG.
243 * NOTE: According to SCSI-2, the true transfer period (in ns) is
244 * actually four times this period value */
246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
247 __u8 offset, __u8 period)
251 __u8 min_xferp = (hostdata->chip710
252 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
253 __u8 max_offset = (hostdata->chip710
254 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
259 if(period < hostdata->min_period) {
260 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
261 period = hostdata->min_period;
263 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
264 if(offset > max_offset) {
265 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
269 if(XFERP < min_xferp) {
272 return (offset & 0x0f) | (XFERP & 0x07)<<4;
276 NCR_700_get_SXFER(struct scsi_device *SDp)
278 struct NCR_700_Host_Parameters *hostdata =
279 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
281 return NCR_700_offset_period_to_sxfer(hostdata,
282 spi_offset(SDp->sdev_target),
283 spi_period(SDp->sdev_target));
287 NCR_700_detect(struct scsi_host_template *tpnt,
288 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
290 dma_addr_t pScript, pSlots;
293 struct Scsi_Host *host;
294 static int banner = 0;
297 if(tpnt->sdev_attrs == NULL)
298 tpnt->sdev_attrs = NCR_700_dev_attrs;
300 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
301 &pScript, GFP_KERNEL);
303 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
307 script = (__u32 *)memory;
308 hostdata->msgin = memory + MSGIN_OFFSET;
309 hostdata->msgout = memory + MSGOUT_OFFSET;
310 hostdata->status = memory + STATUS_OFFSET;
311 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
314 pSlots = pScript + SLOTS_OFFSET;
316 /* Fill in the missing routines from the host template */
317 tpnt->queuecommand = NCR_700_queuecommand;
318 tpnt->eh_abort_handler = NCR_700_abort;
319 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
320 tpnt->eh_host_reset_handler = NCR_700_host_reset;
321 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
322 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
323 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
324 tpnt->use_clustering = ENABLE_CLUSTERING;
325 tpnt->slave_configure = NCR_700_slave_configure;
326 tpnt->slave_destroy = NCR_700_slave_destroy;
327 tpnt->slave_alloc = NCR_700_slave_alloc;
328 tpnt->change_queue_depth = NCR_700_change_queue_depth;
329 tpnt->change_queue_type = NCR_700_change_queue_type;
331 if(tpnt->name == NULL)
332 tpnt->name = "53c700";
333 if(tpnt->proc_name == NULL)
334 tpnt->proc_name = "53c700";
336 host = scsi_host_alloc(tpnt, 4);
339 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
340 * NCR_700_COMMAND_SLOTS_PER_HOST);
341 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
342 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
343 - (unsigned long)&hostdata->slots[0].SG[0]);
344 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
346 hostdata->free_list = &hostdata->slots[j];
348 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
349 hostdata->slots[j].state = NCR_700_SLOT_FREE;
352 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
353 script[j] = bS_to_host(SCRIPT[j]);
355 /* adjust all labels to be bus physical */
356 for (j = 0; j < PATCHES; j++)
357 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
358 /* now patch up fixed addresses. */
359 script_patch_32(hostdata->dev, script, MessageLocation,
360 pScript + MSGOUT_OFFSET);
361 script_patch_32(hostdata->dev, script, StatusAddress,
362 pScript + STATUS_OFFSET);
363 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
364 pScript + MSGIN_OFFSET);
366 hostdata->script = script;
367 hostdata->pScript = pScript;
368 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
369 hostdata->state = NCR_700_HOST_FREE;
370 hostdata->cmd = NULL;
372 host->max_lun = NCR_700_MAX_LUNS;
373 BUG_ON(NCR_700_transport_template == NULL);
374 host->transportt = NCR_700_transport_template;
375 host->unique_id = (unsigned long)hostdata->base;
376 hostdata->eh_complete = NULL;
377 host->hostdata[0] = (unsigned long)hostdata;
379 NCR_700_writeb(0xff, host, CTEST9_REG);
380 if (hostdata->chip710)
381 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
383 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
384 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
386 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
389 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
390 hostdata->chip710 ? "53c710" :
391 (hostdata->fast ? "53c700-66" : "53c700"),
392 hostdata->rev, hostdata->differential ?
393 "(Differential)" : "");
395 NCR_700_chip_reset(host);
397 if (scsi_add_host(host, dev)) {
398 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
403 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
410 NCR_700_release(struct Scsi_Host *host)
412 struct NCR_700_Host_Parameters *hostdata =
413 (struct NCR_700_Host_Parameters *)host->hostdata[0];
415 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
416 hostdata->script, hostdata->pScript);
421 NCR_700_identify(int can_disconnect, __u8 lun)
423 return IDENTIFY_BASE |
424 ((can_disconnect) ? 0x40 : 0) |
425 (lun & NCR_700_LUN_MASK);
429 * Function : static int data_residual (Scsi_Host *host)
431 * Purpose : return residual data count of what's in the chip. If you
432 * really want to know what this function is doing, it's almost a
433 * direct transcription of the algorithm described in the 53c710
434 * guide, except that the DBC and DFIFO registers are only 6 bits
437 * Inputs : host - SCSI host */
439 NCR_700_data_residual (struct Scsi_Host *host) {
440 struct NCR_700_Host_Parameters *hostdata =
441 (struct NCR_700_Host_Parameters *)host->hostdata[0];
442 int count, synchronous = 0;
445 if(hostdata->chip710) {
446 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
447 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
449 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
450 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
454 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
456 /* get the data direction */
457 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
462 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
464 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
468 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
469 if (sstat & SODL_REG_FULL)
471 if (synchronous && (sstat & SODR_REG_FULL))
476 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
481 /* print out the SCSI wires and corresponding phase from the SBCL register
484 sbcl_to_string(__u8 sbcl)
487 static char ret[256];
492 strcat(ret, NCR_700_SBCL_bits[i]);
494 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
499 bitmap_to_number(__u8 bitmap)
503 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
508 /* Pull a slot off the free list */
509 STATIC struct NCR_700_command_slot *
510 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
512 struct NCR_700_command_slot *slot = hostdata->free_list;
516 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
517 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
521 if(slot->state != NCR_700_SLOT_FREE)
523 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
526 hostdata->free_list = slot->ITL_forw;
527 slot->ITL_forw = NULL;
530 /* NOTE: set the state to busy here, not queued, since this
531 * indicates the slot is in use and cannot be run by the IRQ
532 * finish routine. If we cannot queue the command when it
533 * is properly build, we then change to NCR_700_SLOT_QUEUED */
534 slot->state = NCR_700_SLOT_BUSY;
536 hostdata->command_slot_count++;
542 free_slot(struct NCR_700_command_slot *slot,
543 struct NCR_700_Host_Parameters *hostdata)
545 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
546 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
548 if(slot->state == NCR_700_SLOT_FREE) {
549 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
552 slot->resume_offset = 0;
554 slot->state = NCR_700_SLOT_FREE;
555 slot->ITL_forw = hostdata->free_list;
556 hostdata->free_list = slot;
557 hostdata->command_slot_count--;
561 /* This routine really does very little. The command is indexed on
562 the ITL and (if tagged) the ITLQ lists in _queuecommand */
564 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
565 struct scsi_cmnd *SCp, __u32 dsp)
567 /* Its just possible that this gets executed twice */
569 struct NCR_700_command_slot *slot =
570 (struct NCR_700_command_slot *)SCp->host_scribble;
572 slot->resume_offset = dsp;
574 hostdata->state = NCR_700_HOST_FREE;
575 hostdata->cmd = NULL;
579 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
580 struct NCR_700_command_slot *slot)
582 if(SCp->sc_data_direction != DMA_NONE &&
583 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
588 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
589 struct scsi_cmnd *SCp, int result)
591 hostdata->state = NCR_700_HOST_FREE;
592 hostdata->cmd = NULL;
595 struct NCR_700_command_slot *slot =
596 (struct NCR_700_command_slot *)SCp->host_scribble;
598 dma_unmap_single(hostdata->dev, slot->pCmd,
599 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
600 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
601 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
603 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
604 SCp, SCp->cmnd[7], result);
605 scsi_print_sense("53c700", SCp);
608 dma_unmap_single(hostdata->dev, slot->dma_handle,
609 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
610 /* restore the old result if the request sense was
614 /* restore the original length */
615 SCp->cmd_len = cmnd[8];
617 NCR_700_unmap(hostdata, SCp, slot);
619 free_slot(slot, hostdata);
621 if(NCR_700_get_depth(SCp->device) == 0 ||
622 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
623 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
624 NCR_700_get_depth(SCp->device));
625 #endif /* NCR_700_DEBUG */
626 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
628 SCp->host_scribble = NULL;
629 SCp->result = result;
632 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
638 NCR_700_internal_bus_reset(struct Scsi_Host *host)
641 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
643 NCR_700_writeb(0, host, SCNTL1_REG);
648 NCR_700_chip_setup(struct Scsi_Host *host)
650 struct NCR_700_Host_Parameters *hostdata =
651 (struct NCR_700_Host_Parameters *)host->hostdata[0];
653 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
655 if(hostdata->chip710) {
656 __u8 burst_disable = 0;
657 __u8 burst_length = 0;
659 switch (hostdata->burst_length) {
661 burst_length = BURST_LENGTH_1;
664 burst_length = BURST_LENGTH_2;
667 burst_length = BURST_LENGTH_4;
670 burst_length = BURST_LENGTH_8;
673 burst_disable = BURST_DISABLE;
676 hostdata->dcntl_extra |= COMPAT_700_MODE;
678 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
679 NCR_700_writeb(burst_length | hostdata->dmode_extra,
680 host, DMODE_710_REG);
681 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
682 (hostdata->differential ? DIFF : 0),
684 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
685 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
686 | AUTO_ATN, host, SCNTL0_REG);
688 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
689 host, DMODE_700_REG);
690 NCR_700_writeb(hostdata->differential ?
691 DIFF : 0, host, CTEST7_REG);
693 /* this is for 700-66, does nothing on 700 */
694 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
695 | GENERATE_RECEIVE_PARITY, host,
698 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
699 | PARITY | AUTO_ATN, host, SCNTL0_REG);
703 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
704 NCR_700_writeb(0, host, SBCL_REG);
705 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
707 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
708 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
710 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
711 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
712 if(hostdata->clock > 75) {
713 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
714 /* do the best we can, but the async clock will be out
715 * of spec: sync divider 2, async divider 3 */
716 DEBUG(("53c700: sync 2 async 3\n"));
717 NCR_700_writeb(SYNC_DIV_2_0, 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 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
721 /* sync divider 1.5, async divider 3 */
722 DEBUG(("53c700: sync 1.5 async 3\n"));
723 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
724 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
725 hostdata->sync_clock = hostdata->clock*2;
726 hostdata->sync_clock /= 3;
728 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
729 /* sync divider 1, async divider 2 */
730 DEBUG(("53c700: sync 1 async 2\n"));
731 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
732 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
733 hostdata->sync_clock = hostdata->clock;
734 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
735 /* sync divider 1, async divider 1.5 */
736 DEBUG(("53c700: sync 1 async 1.5\n"));
737 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
738 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
739 hostdata->sync_clock = hostdata->clock;
741 DEBUG(("53c700: sync 1 async 1\n"));
742 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
743 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
744 /* sync divider 1, async divider 1 */
745 hostdata->sync_clock = hostdata->clock;
747 /* Calculate the actual minimum period that can be supported
748 * by our synchronous clock speed. See the 710 manual for
749 * exact details of this calculation which is based on a
750 * setting of the SXFER register */
751 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
752 hostdata->min_period = NCR_700_MIN_PERIOD;
753 if(min_period > NCR_700_MIN_PERIOD)
754 hostdata->min_period = min_period;
758 NCR_700_chip_reset(struct Scsi_Host *host)
760 struct NCR_700_Host_Parameters *hostdata =
761 (struct NCR_700_Host_Parameters *)host->hostdata[0];
762 if(hostdata->chip710) {
763 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
766 NCR_700_writeb(0, host, ISTAT_REG);
768 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
771 NCR_700_writeb(0, host, DCNTL_REG);
776 NCR_700_chip_setup(host);
779 /* The heart of the message processing engine is that the instruction
780 * immediately after the INT is the normal case (and so must be CLEAR
781 * ACK). If we want to do something else, we call that routine in
782 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
783 * ACK) so that the routine returns correctly to resume its activity
786 process_extended_message(struct Scsi_Host *host,
787 struct NCR_700_Host_Parameters *hostdata,
788 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
790 __u32 resume_offset = dsp, temp = dsp + 8;
791 __u8 pun = 0xff, lun = 0xff;
794 pun = SCp->device->id;
795 lun = SCp->device->lun;
798 switch(hostdata->msgin[2]) {
800 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
801 struct scsi_target *starget = SCp->device->sdev_target;
802 __u8 period = hostdata->msgin[3];
803 __u8 offset = hostdata->msgin[4];
805 if(offset == 0 || period == 0) {
810 spi_offset(starget) = offset;
811 spi_period(starget) = period;
813 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
814 spi_display_xfer_agreement(starget);
815 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
818 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
819 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
821 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
825 /* SDTR message out of the blue, reject it */
826 shost_printk(KERN_WARNING, host,
827 "Unexpected SDTR msg\n");
828 hostdata->msgout[0] = A_REJECT_MSG;
829 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
830 script_patch_16(hostdata->dev, hostdata->script,
832 /* SendMsgOut returns, so set up the return
834 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
839 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
840 host->host_no, pun, lun);
841 hostdata->msgout[0] = A_REJECT_MSG;
842 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
843 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
845 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
850 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
851 host->host_no, pun, lun,
852 NCR_700_phase[(dsps & 0xf00) >> 8]);
853 spi_print_msg(hostdata->msgin);
856 hostdata->msgout[0] = A_REJECT_MSG;
857 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
858 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
860 /* SendMsgOut returns, so set up the return
862 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
864 NCR_700_writel(temp, host, TEMP_REG);
865 return resume_offset;
869 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
870 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
872 /* work out where to return to */
873 __u32 temp = dsp + 8, resume_offset = dsp;
874 __u8 pun = 0xff, lun = 0xff;
877 pun = SCp->device->id;
878 lun = SCp->device->lun;
882 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
883 NCR_700_phase[(dsps & 0xf00) >> 8]);
884 spi_print_msg(hostdata->msgin);
888 switch(hostdata->msgin[0]) {
891 resume_offset = process_extended_message(host, hostdata, SCp,
896 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
897 /* Rejected our sync negotiation attempt */
898 spi_period(SCp->device->sdev_target) =
899 spi_offset(SCp->device->sdev_target) = 0;
900 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
901 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
902 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
903 /* rejected our first simple tag message */
904 scmd_printk(KERN_WARNING, SCp,
905 "Rejected first tag queue attempt, turning off tag queueing\n");
906 /* we're done negotiating */
907 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
908 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
909 SCp->device->tagged_supported = 0;
910 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
912 shost_printk(KERN_WARNING, host,
913 "(%d:%d) Unexpected REJECT Message %s\n",
915 NCR_700_phase[(dsps & 0xf00) >> 8]);
916 /* however, just ignore it */
920 case A_PARITY_ERROR_MSG:
921 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
923 NCR_700_internal_bus_reset(host);
925 case A_SIMPLE_TAG_MSG:
926 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
927 pun, lun, hostdata->msgin[1],
928 NCR_700_phase[(dsps & 0xf00) >> 8]);
932 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
933 host->host_no, pun, lun,
934 NCR_700_phase[(dsps & 0xf00) >> 8]);
936 spi_print_msg(hostdata->msgin);
939 hostdata->msgout[0] = A_REJECT_MSG;
940 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
941 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
943 /* SendMsgOut returns, so set up the return
945 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
949 NCR_700_writel(temp, host, TEMP_REG);
950 /* set us up to receive another message */
951 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
952 return resume_offset;
956 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
957 struct Scsi_Host *host,
958 struct NCR_700_Host_Parameters *hostdata)
960 __u32 resume_offset = 0;
961 __u8 pun = 0xff, lun=0xff;
964 pun = SCp->device->id;
965 lun = SCp->device->lun;
968 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
969 DEBUG((" COMMAND COMPLETE, status=%02x\n",
970 hostdata->status[0]));
971 /* OK, if TCQ still under negotiation, we now know it works */
972 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
973 NCR_700_set_tag_neg_state(SCp->device,
974 NCR_700_FINISHED_TAG_NEGOTIATION);
976 /* check for contingent allegiance contitions */
977 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
978 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
979 struct NCR_700_command_slot *slot =
980 (struct NCR_700_command_slot *)SCp->host_scribble;
981 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
982 /* OOPS: bad device, returning another
983 * contingent allegiance condition */
984 scmd_printk(KERN_ERR, SCp,
985 "broken device is looping in contingent allegiance: ignoring\n");
986 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
989 NCR_700_get_sense_cmnd(SCp->device);
991 scsi_print_command(SCp);
992 printk(" cmd %p has status %d, requesting sense\n",
993 SCp, hostdata->status[0]);
995 /* we can destroy the command here
996 * because the contingent allegiance
997 * condition will cause a retry which
998 * will re-copy the command from the
999 * saved data_cmnd. We also unmap any
1000 * data associated with the command
1002 NCR_700_unmap(hostdata, SCp, slot);
1003 dma_unmap_single(hostdata->dev, slot->pCmd,
1007 cmnd[0] = REQUEST_SENSE;
1008 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1011 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1013 /* Here's a quiet hack: the
1014 * REQUEST_SENSE command is six bytes,
1015 * so store a flag indicating that
1016 * this was an internal sense request
1017 * and the original status at the end
1019 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1020 cmnd[7] = hostdata->status[0];
1021 cmnd[8] = SCp->cmd_len;
1022 SCp->cmd_len = 6; /* command length for
1024 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1025 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1026 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1027 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1028 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1029 slot->SG[1].pAddr = 0;
1030 slot->resume_offset = hostdata->pScript;
1031 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1032 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1034 /* queue the command for reissue */
1035 slot->state = NCR_700_SLOT_QUEUED;
1036 slot->flags = NCR_700_FLAG_AUTOSENSE;
1037 hostdata->state = NCR_700_HOST_FREE;
1038 hostdata->cmd = NULL;
1041 // Currently rely on the mid layer evaluation
1042 // of the tag queuing capability
1044 //if(status_byte(hostdata->status[0]) == GOOD &&
1045 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1046 // /* Piggy back the tag queueing support
1047 // * on this command */
1048 // dma_sync_single_for_cpu(hostdata->dev,
1049 // slot->dma_handle,
1050 // SCp->request_bufflen,
1051 // DMA_FROM_DEVICE);
1052 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1053 // scmd_printk(KERN_INFO, SCp,
1054 // "Enabling Tag Command Queuing\n");
1055 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1056 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1059 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1062 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1064 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1065 __u8 i = (dsps & 0xf00) >> 8;
1067 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1069 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1070 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1072 scsi_print_command(SCp);
1074 NCR_700_internal_bus_reset(host);
1075 } else if((dsps & 0xfffff000) == A_FATAL) {
1076 int i = (dsps & 0xfff);
1078 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1079 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1080 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1081 printk(KERN_ERR " msg begins %02x %02x\n",
1082 hostdata->msgin[0], hostdata->msgin[1]);
1084 NCR_700_internal_bus_reset(host);
1085 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1086 #ifdef NCR_700_DEBUG
1087 __u8 i = (dsps & 0xf00) >> 8;
1089 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1090 host->host_no, pun, lun,
1091 i, NCR_700_phase[i]);
1093 save_for_reselection(hostdata, SCp, dsp);
1095 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1097 struct NCR_700_command_slot *slot;
1098 __u8 reselection_id = hostdata->reselection_id;
1099 struct scsi_device *SDp;
1101 lun = hostdata->msgin[0] & 0x1f;
1103 hostdata->reselection_id = 0xff;
1104 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1105 host->host_no, reselection_id, lun));
1106 /* clear the reselection indicator */
1107 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1108 if(unlikely(SDp == NULL)) {
1109 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1110 host->host_no, reselection_id, lun);
1113 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1114 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1115 if(unlikely(SCp == NULL)) {
1116 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1117 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1121 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1122 DDEBUG(KERN_DEBUG, SDp,
1123 "reselection is tag %d, slot %p(%d)\n",
1124 hostdata->msgin[2], slot, slot->tag);
1126 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1127 if(unlikely(SCp == NULL)) {
1128 sdev_printk(KERN_ERR, SDp,
1129 "no saved request for untagged cmd\n");
1132 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1136 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1137 host->host_no, reselection_id, lun,
1138 hostdata->msgin[0], hostdata->msgin[1],
1139 hostdata->msgin[2]);
1141 if(hostdata->state != NCR_700_HOST_BUSY)
1142 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1144 resume_offset = slot->resume_offset;
1145 hostdata->cmd = slot->cmnd;
1147 /* re-patch for this command */
1148 script_patch_32_abs(hostdata->dev, hostdata->script,
1149 CommandAddress, slot->pCmd);
1150 script_patch_16(hostdata->dev, hostdata->script,
1151 CommandCount, slot->cmnd->cmd_len);
1152 script_patch_32_abs(hostdata->dev, hostdata->script,
1153 SGScriptStartAddress,
1154 to32bit(&slot->pSG[0].ins));
1156 /* Note: setting SXFER only works if we're
1157 * still in the MESSAGE phase, so it is vital
1158 * that ACK is still asserted when we process
1159 * the reselection message. The resume offset
1160 * should therefore always clear ACK */
1161 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1163 dma_cache_sync(hostdata->dev, hostdata->msgin,
1164 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1165 dma_cache_sync(hostdata->dev, hostdata->msgout,
1166 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1167 /* I'm just being paranoid here, the command should
1168 * already have been flushed from the cache */
1169 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1170 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1175 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1177 /* This section is full of debugging code because I've
1178 * never managed to reach it. I think what happens is
1179 * that, because the 700 runs with selection
1180 * interrupts enabled the whole time that we take a
1181 * selection interrupt before we manage to get to the
1182 * reselected script interrupt */
1184 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1185 struct NCR_700_command_slot *slot;
1187 /* Take out our own ID */
1188 reselection_id &= ~(1<<host->this_id);
1190 /* I've never seen this happen, so keep this as a printk rather
1192 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1193 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1196 /* FIXME: DEBUGGING CODE */
1197 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1200 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1201 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1202 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1205 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);
1206 SCp = hostdata->slots[i].cmnd;
1210 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1211 /* change slot from busy to queued to redo command */
1212 slot->state = NCR_700_SLOT_QUEUED;
1214 hostdata->cmd = NULL;
1216 if(reselection_id == 0) {
1217 if(hostdata->reselection_id == 0xff) {
1218 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1221 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1223 reselection_id = hostdata->reselection_id;
1227 /* convert to real ID */
1228 reselection_id = bitmap_to_number(reselection_id);
1230 hostdata->reselection_id = reselection_id;
1231 /* just in case we have a stale simple tag message, clear it */
1232 hostdata->msgin[1] = 0;
1233 dma_cache_sync(hostdata->dev, hostdata->msgin,
1234 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1235 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1236 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1238 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1240 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1241 /* we've just disconnected from the bus, do nothing since
1242 * a return here will re-run the queued command slot
1243 * that may have been interrupted by the initial selection */
1244 DEBUG((" SELECTION COMPLETED\n"));
1245 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1246 resume_offset = process_message(host, hostdata, SCp,
1248 } else if((dsps & 0xfffff000) == 0) {
1249 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1250 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1251 host->host_no, pun, lun, NCR_700_condition[i],
1252 NCR_700_phase[j], dsp - hostdata->pScript);
1254 struct scatterlist *sg;
1256 scsi_print_command(SCp);
1257 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1258 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);
1261 NCR_700_internal_bus_reset(host);
1262 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1263 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1264 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1265 resume_offset = dsp;
1267 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1268 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1269 NCR_700_internal_bus_reset(host);
1271 return resume_offset;
1274 /* We run the 53c700 with selection interrupts always enabled. This
1275 * means that the chip may be selected as soon as the bus frees. On a
1276 * busy bus, this can be before the scripts engine finishes its
1277 * processing. Therefore, part of the selection processing has to be
1278 * to find out what the scripts engine is doing and complete the
1279 * function if necessary (i.e. process the pending disconnect or save
1280 * the interrupted initial selection */
1282 process_selection(struct Scsi_Host *host, __u32 dsp)
1284 __u8 id = 0; /* Squash compiler warning */
1286 __u32 resume_offset = 0;
1287 struct NCR_700_Host_Parameters *hostdata =
1288 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1289 struct scsi_cmnd *SCp = hostdata->cmd;
1292 for(count = 0; count < 5; count++) {
1293 id = NCR_700_readb(host, hostdata->chip710 ?
1294 CTEST9_REG : SFBR_REG);
1296 /* Take out our own ID */
1297 id &= ~(1<<host->this_id);
1302 sbcl = NCR_700_readb(host, SBCL_REG);
1303 if((sbcl & SBCL_IO) == 0) {
1304 /* mark as having been selected rather than reselected */
1307 /* convert to real ID */
1308 hostdata->reselection_id = id = bitmap_to_number(id);
1309 DEBUG(("scsi%d: Reselected by %d\n",
1310 host->host_no, id));
1312 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1313 struct NCR_700_command_slot *slot =
1314 (struct NCR_700_command_slot *)SCp->host_scribble;
1315 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));
1317 switch(dsp - hostdata->pScript) {
1318 case Ent_Disconnect1:
1319 case Ent_Disconnect2:
1320 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1322 case Ent_Disconnect3:
1323 case Ent_Disconnect4:
1324 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1326 case Ent_Disconnect5:
1327 case Ent_Disconnect6:
1328 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1330 case Ent_Disconnect7:
1331 case Ent_Disconnect8:
1332 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1336 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1340 slot->state = NCR_700_SLOT_QUEUED;
1344 hostdata->state = NCR_700_HOST_BUSY;
1345 hostdata->cmd = NULL;
1346 /* clear any stale simple tag message */
1347 hostdata->msgin[1] = 0;
1348 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1352 /* Selected as target, Ignore */
1353 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1354 } else if(hostdata->tag_negotiated & (1<<id)) {
1355 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1357 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1359 return resume_offset;
1363 NCR_700_clear_fifo(struct Scsi_Host *host) {
1364 const struct NCR_700_Host_Parameters *hostdata
1365 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1366 if(hostdata->chip710) {
1367 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1369 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1374 NCR_700_flush_fifo(struct Scsi_Host *host) {
1375 const struct NCR_700_Host_Parameters *hostdata
1376 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1377 if(hostdata->chip710) {
1378 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1380 NCR_700_writeb(0, host, CTEST8_REG);
1382 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1384 NCR_700_writeb(0, host, DFIFO_REG);
1389 /* The queue lock with interrupts disabled must be held on entry to
1392 NCR_700_start_command(struct scsi_cmnd *SCp)
1394 struct NCR_700_command_slot *slot =
1395 (struct NCR_700_command_slot *)SCp->host_scribble;
1396 struct NCR_700_Host_Parameters *hostdata =
1397 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1398 __u16 count = 1; /* for IDENTIFY message */
1400 if(hostdata->state != NCR_700_HOST_FREE) {
1401 /* keep this inside the lock to close the race window where
1402 * the running command finishes on another CPU while we don't
1403 * change the state to queued on this one */
1404 slot->state = NCR_700_SLOT_QUEUED;
1406 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1407 SCp->device->host->host_no, slot->cmnd, slot));
1410 hostdata->state = NCR_700_HOST_BUSY;
1411 hostdata->cmd = SCp;
1412 slot->state = NCR_700_SLOT_BUSY;
1413 /* keep interrupts disabled until we have the command correctly
1414 * set up so we cannot take a selection interrupt */
1416 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1417 slot->flags != NCR_700_FLAG_AUTOSENSE),
1419 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420 * if the negotiated transfer parameters still hold, so
1421 * always renegotiate them */
1422 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1423 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1424 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1427 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1428 * If a contingent allegiance condition exists, the device
1429 * will refuse all tags, so send the request sense as untagged
1431 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1432 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1433 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1434 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1437 if(hostdata->fast &&
1438 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1439 count += spi_populate_sync_msg(&hostdata->msgout[count],
1440 spi_period(SCp->device->sdev_target),
1441 spi_offset(SCp->device->sdev_target));
1442 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1445 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1448 script_patch_ID(hostdata->dev, hostdata->script,
1449 Device_ID, 1<<scmd_id(SCp));
1451 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1453 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1455 /* finally plumb the beginning of the SG list into the script
1457 script_patch_32_abs(hostdata->dev, hostdata->script,
1458 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1459 NCR_700_clear_fifo(SCp->device->host);
1461 if(slot->resume_offset == 0)
1462 slot->resume_offset = hostdata->pScript;
1463 /* now perform all the writebacks and invalidates */
1464 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1465 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1467 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1468 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1470 /* set the synchronous period/offset */
1471 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1472 SCp->device->host, SXFER_REG);
1473 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1474 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1480 NCR_700_intr(int irq, void *dev_id)
1482 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1483 struct NCR_700_Host_Parameters *hostdata =
1484 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1486 __u32 resume_offset = 0;
1487 __u8 pun = 0xff, lun = 0xff;
1488 unsigned long flags;
1491 /* Use the host lock to serialise access to the 53c700
1492 * hardware. Note: In future, we may need to take the queue
1493 * lock to enter the done routines. When that happens, we
1494 * need to ensure that for this driver, the host lock and the
1495 * queue lock point to the same thing. */
1496 spin_lock_irqsave(host->host_lock, flags);
1497 if((istat = NCR_700_readb(host, ISTAT_REG))
1498 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1500 __u8 sstat0 = 0, dstat = 0;
1502 struct scsi_cmnd *SCp = hostdata->cmd;
1503 enum NCR_700_Host_State state;
1506 state = hostdata->state;
1507 SCp = hostdata->cmd;
1509 if(istat & SCSI_INT_PENDING) {
1512 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1515 if(istat & DMA_INT_PENDING) {
1518 dstat = NCR_700_readb(host, DSTAT_REG);
1521 dsps = NCR_700_readl(host, DSPS_REG);
1522 dsp = NCR_700_readl(host, DSP_REG);
1524 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1525 host->host_no, istat, sstat0, dstat,
1526 (dsp - (__u32)(hostdata->pScript))/4,
1530 pun = SCp->device->id;
1531 lun = SCp->device->lun;
1534 if(sstat0 & SCSI_RESET_DETECTED) {
1535 struct scsi_device *SDp;
1538 hostdata->state = NCR_700_HOST_BUSY;
1540 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1541 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1543 scsi_report_bus_reset(host, 0);
1545 /* clear all the negotiated parameters */
1546 __shost_for_each_device(SDp, host)
1547 NCR_700_clear_flag(SDp, ~0);
1549 /* clear all the slots and their pending commands */
1550 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1551 struct scsi_cmnd *SCp;
1552 struct NCR_700_command_slot *slot =
1553 &hostdata->slots[i];
1555 if(slot->state == NCR_700_SLOT_FREE)
1559 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1561 free_slot(slot, hostdata);
1562 SCp->host_scribble = NULL;
1563 NCR_700_set_depth(SCp->device, 0);
1564 /* NOTE: deadlock potential here: we
1565 * rely on mid-layer guarantees that
1566 * scsi_done won't try to issue the
1567 * command again otherwise we'll
1569 * hostdata->state_lock */
1570 SCp->result = DID_RESET << 16;
1571 SCp->scsi_done(SCp);
1574 NCR_700_chip_setup(host);
1576 hostdata->state = NCR_700_HOST_FREE;
1577 hostdata->cmd = NULL;
1578 /* signal back if this was an eh induced reset */
1579 if(hostdata->eh_complete != NULL)
1580 complete(hostdata->eh_complete);
1582 } else if(sstat0 & SELECTION_TIMEOUT) {
1583 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1584 host->host_no, pun, lun));
1585 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1586 } else if(sstat0 & PHASE_MISMATCH) {
1587 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1588 (struct NCR_700_command_slot *)SCp->host_scribble;
1590 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1591 /* It wants to reply to some part of
1593 #ifdef NCR_700_DEBUG
1594 __u32 temp = NCR_700_readl(host, TEMP_REG);
1595 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1596 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)));
1598 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1599 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1600 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1601 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1602 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1603 int residual = NCR_700_data_residual(host);
1605 #ifdef NCR_700_DEBUG
1606 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1608 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1609 host->host_no, pun, lun,
1610 SGcount, data_transfer);
1611 scsi_print_command(SCp);
1613 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1614 host->host_no, pun, lun,
1615 SGcount, data_transfer, residual);
1618 data_transfer += residual;
1620 if(data_transfer != 0) {
1626 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1627 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1628 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1629 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1630 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1631 pAddr += (count - data_transfer);
1632 #ifdef NCR_700_DEBUG
1633 if(pAddr != naddr) {
1634 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);
1637 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1639 /* set the executed moves to nops */
1640 for(i=0; i<SGcount; i++) {
1641 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1642 slot->SG[i].pAddr = 0;
1644 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1645 /* and pretend we disconnected after
1646 * the command phase */
1647 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1648 /* make sure all the data is flushed */
1649 NCR_700_flush_fifo(host);
1651 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1652 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1653 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1654 NCR_700_internal_bus_reset(host);
1657 } else if(sstat0 & SCSI_GROSS_ERROR) {
1658 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1659 host->host_no, pun, lun);
1660 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1661 } else if(sstat0 & PARITY_ERROR) {
1662 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1663 host->host_no, pun, lun);
1664 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 } else if(dstat & SCRIPT_INT_RECEIVED) {
1666 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1667 host->host_no, pun, lun));
1668 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1669 } else if(dstat & (ILGL_INST_DETECTED)) {
1670 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1671 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1672 host->host_no, pun, lun,
1673 dsp, dsp - hostdata->pScript);
1674 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1676 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1677 host->host_no, pun, lun, dstat);
1678 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1682 /* NOTE: selection interrupt processing MUST occur
1683 * after script interrupt processing to correctly cope
1684 * with the case where we process a disconnect and
1685 * then get reselected before we process the
1687 if(sstat0 & SELECTED) {
1688 /* FIXME: It currently takes at least FOUR
1689 * interrupts to complete a command that
1690 * disconnects: one for the disconnect, one
1691 * for the reselection, one to get the
1692 * reselection data and one to complete the
1693 * command. If we guess the reselected
1694 * command here and prepare it, we only need
1695 * to get a reselection data interrupt if we
1696 * guessed wrongly. Since the interrupt
1697 * overhead is much greater than the command
1698 * setup, this would be an efficient
1699 * optimisation particularly as we probably
1700 * only have one outstanding command on a
1701 * target most of the time */
1703 resume_offset = process_selection(host, dsp);
1710 if(hostdata->state != NCR_700_HOST_BUSY) {
1711 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1712 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1713 hostdata->state = NCR_700_HOST_BUSY;
1716 DEBUG(("Attempting to resume at %x\n", resume_offset));
1717 NCR_700_clear_fifo(host);
1718 NCR_700_writel(resume_offset, host, DSP_REG);
1720 /* There is probably a technical no-no about this: If we're a
1721 * shared interrupt and we got this interrupt because the
1722 * other device needs servicing not us, we're still going to
1723 * check our queued commands here---of course, there shouldn't
1724 * be any outstanding.... */
1725 if(hostdata->state == NCR_700_HOST_FREE) {
1728 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1729 /* fairness: always run the queue from the last
1730 * position we left off */
1731 int j = (i + hostdata->saved_slot_position)
1732 % NCR_700_COMMAND_SLOTS_PER_HOST;
1734 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1736 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1737 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1738 host->host_no, &hostdata->slots[j],
1739 hostdata->slots[j].cmnd));
1740 hostdata->saved_slot_position = j + 1;
1747 spin_unlock_irqrestore(host->host_lock, flags);
1748 return IRQ_RETVAL(handled);
1752 NCR_700_queuecommand_lck(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1754 struct NCR_700_Host_Parameters *hostdata =
1755 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1757 enum dma_data_direction direction;
1758 struct NCR_700_command_slot *slot;
1760 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1761 /* We're over our allocation, this should never happen
1762 * since we report the max allocation to the mid layer */
1763 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1766 /* check for untagged commands. We cannot have any outstanding
1767 * commands if we accept them. Commands could be untagged because:
1769 * - The tag negotiated bitmap is clear
1770 * - The blk layer sent and untagged command
1772 if(NCR_700_get_depth(SCp->device) != 0
1773 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1774 || !blk_rq_tagged(SCp->request))) {
1775 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1776 NCR_700_get_depth(SCp->device));
1777 return SCSI_MLQUEUE_DEVICE_BUSY;
1779 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1780 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1781 NCR_700_get_depth(SCp->device));
1782 return SCSI_MLQUEUE_DEVICE_BUSY;
1784 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1786 /* begin the command here */
1787 /* no need to check for NULL, test for command_slot_count above
1788 * ensures a slot is free */
1789 slot = find_empty_slot(hostdata);
1793 SCp->scsi_done = done;
1794 SCp->host_scribble = (unsigned char *)slot;
1795 SCp->SCp.ptr = NULL;
1796 SCp->SCp.buffer = NULL;
1798 #ifdef NCR_700_DEBUG
1799 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1800 scsi_print_command(SCp);
1802 if(blk_rq_tagged(SCp->request)
1803 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1804 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1805 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1806 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1807 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1810 /* here we may have to process an untagged command. The gate
1811 * above ensures that this will be the only one outstanding,
1812 * so clear the tag negotiated bit.
1814 * FIXME: This will royally screw up on multiple LUN devices
1816 if(!blk_rq_tagged(SCp->request)
1817 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1818 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1819 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1822 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1823 && scsi_get_tag_type(SCp->device)) {
1824 slot->tag = SCp->request->tag;
1825 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1828 slot->tag = SCSI_NO_TAG;
1829 /* must populate current_cmnd for scsi_find_tag to work */
1830 SCp->device->current_cmnd = SCp;
1832 /* sanity check: some of the commands generated by the mid-layer
1833 * have an eccentric idea of their sc_data_direction */
1834 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1835 SCp->sc_data_direction != DMA_NONE) {
1836 #ifdef NCR_700_DEBUG
1837 printk("53c700: Command");
1838 scsi_print_command(SCp);
1839 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1841 SCp->sc_data_direction = DMA_NONE;
1844 switch (SCp->cmnd[0]) {
1846 /* clear the internal sense magic */
1850 /* OK, get it from the command */
1851 switch(SCp->sc_data_direction) {
1852 case DMA_BIDIRECTIONAL:
1854 printk(KERN_ERR "53c700: Unknown command for data direction ");
1855 scsi_print_command(SCp);
1862 case DMA_FROM_DEVICE:
1863 move_ins = SCRIPT_MOVE_DATA_IN;
1866 move_ins = SCRIPT_MOVE_DATA_OUT;
1871 /* now build the scatter gather list */
1872 direction = SCp->sc_data_direction;
1876 dma_addr_t vPtr = 0;
1877 struct scatterlist *sg;
1880 sg_count = scsi_dma_map(SCp);
1881 BUG_ON(sg_count < 0);
1883 scsi_for_each_sg(SCp, sg, sg_count, i) {
1884 vPtr = sg_dma_address(sg);
1885 count = sg_dma_len(sg);
1887 slot->SG[i].ins = bS_to_host(move_ins | count);
1888 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1889 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1890 slot->SG[i].pAddr = bS_to_host(vPtr);
1892 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1893 slot->SG[i].pAddr = 0;
1894 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1895 DEBUG((" SETTING %08lx to %x\n",
1896 (&slot->pSG[i].ins),
1899 slot->resume_offset = 0;
1900 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1901 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1902 NCR_700_start_command(SCp);
1906 STATIC DEF_SCSI_QCMD(NCR_700_queuecommand)
1909 NCR_700_abort(struct scsi_cmnd * SCp)
1911 struct NCR_700_command_slot *slot;
1913 scmd_printk(KERN_INFO, SCp,
1914 "New error handler wants to abort command\n\t");
1915 scsi_print_command(SCp);
1917 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1920 /* no outstanding command to abort */
1922 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1923 /* FIXME: This is because of a problem in the new
1924 * error handler. When it is in error recovery, it
1925 * will send a TUR to a device it thinks may still be
1926 * showing a problem. If the TUR isn't responded to,
1927 * it will abort it and mark the device off line.
1928 * Unfortunately, it does no other error recovery, so
1929 * this would leave us with an outstanding command
1930 * occupying a slot. Rather than allow this to
1931 * happen, we issue a bus reset to force all
1932 * outstanding commands to terminate here. */
1933 NCR_700_internal_bus_reset(SCp->device->host);
1934 /* still drop through and return failed */
1941 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1943 DECLARE_COMPLETION_ONSTACK(complete);
1944 struct NCR_700_Host_Parameters *hostdata =
1945 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1947 scmd_printk(KERN_INFO, SCp,
1948 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1949 scsi_print_command(SCp);
1951 /* In theory, eh_complete should always be null because the
1952 * eh is single threaded, but just in case we're handling a
1953 * reset via sg or something */
1954 spin_lock_irq(SCp->device->host->host_lock);
1955 while (hostdata->eh_complete != NULL) {
1956 spin_unlock_irq(SCp->device->host->host_lock);
1957 msleep_interruptible(100);
1958 spin_lock_irq(SCp->device->host->host_lock);
1961 hostdata->eh_complete = &complete;
1962 NCR_700_internal_bus_reset(SCp->device->host);
1964 spin_unlock_irq(SCp->device->host->host_lock);
1965 wait_for_completion(&complete);
1966 spin_lock_irq(SCp->device->host->host_lock);
1968 hostdata->eh_complete = NULL;
1969 /* Revalidate the transport parameters of the failing device */
1971 spi_schedule_dv_device(SCp->device);
1973 spin_unlock_irq(SCp->device->host->host_lock);
1978 NCR_700_host_reset(struct scsi_cmnd * SCp)
1980 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1981 scsi_print_command(SCp);
1983 spin_lock_irq(SCp->device->host->host_lock);
1985 NCR_700_internal_bus_reset(SCp->device->host);
1986 NCR_700_chip_reset(SCp->device->host);
1988 spin_unlock_irq(SCp->device->host->host_lock);
1994 NCR_700_set_period(struct scsi_target *STp, int period)
1996 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1997 struct NCR_700_Host_Parameters *hostdata =
1998 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2003 if(period < hostdata->min_period)
2004 period = hostdata->min_period;
2006 spi_period(STp) = period;
2007 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2008 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2009 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2013 NCR_700_set_offset(struct scsi_target *STp, int offset)
2015 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2016 struct NCR_700_Host_Parameters *hostdata =
2017 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2018 int max_offset = hostdata->chip710
2019 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2024 if(offset > max_offset)
2025 offset = max_offset;
2027 /* if we're currently async, make sure the period is reasonable */
2028 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2029 spi_period(STp) > 0xff))
2030 spi_period(STp) = hostdata->min_period;
2032 spi_offset(STp) = offset;
2033 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2034 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2035 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2039 NCR_700_slave_alloc(struct scsi_device *SDp)
2041 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2051 NCR_700_slave_configure(struct scsi_device *SDp)
2053 struct NCR_700_Host_Parameters *hostdata =
2054 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056 /* to do here: allocate memory; build a queue_full list */
2057 if(SDp->tagged_supported) {
2058 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2059 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2060 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062 /* initialise to default depth */
2063 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065 if(hostdata->fast) {
2066 /* Find the correct offset and period via domain validation */
2067 if (!spi_initial_dv(SDp->sdev_target))
2070 spi_offset(SDp->sdev_target) = 0;
2071 spi_period(SDp->sdev_target) = 0;
2077 NCR_700_slave_destroy(struct scsi_device *SDp)
2079 kfree(SDp->hostdata);
2080 SDp->hostdata = NULL;
2084 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth, int reason)
2086 if (reason != SCSI_QDEPTH_DEFAULT)
2089 if (depth > NCR_700_MAX_TAGS)
2090 depth = NCR_700_MAX_TAGS;
2092 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2096 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2098 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2099 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2100 struct NCR_700_Host_Parameters *hostdata =
2101 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2103 scsi_set_tag_type(SDp, tag_type);
2105 /* We have a global (per target) flag to track whether TCQ is
2106 * enabled, so we'll be turning it off for the entire target here.
2107 * our tag algorithm will fail if we mix tagged and untagged commands,
2108 * so quiesce the device before doing this */
2110 scsi_target_quiesce(SDp->sdev_target);
2113 /* shift back to the default unqueued number of commands
2114 * (the user can still raise this) */
2115 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2116 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2118 /* Here, we cleared the negotiation flag above, so this
2119 * will force the driver to renegotiate */
2120 scsi_activate_tcq(SDp, SDp->queue_depth);
2122 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2125 scsi_target_resume(SDp->sdev_target);
2131 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2133 struct scsi_device *SDp = to_scsi_device(dev);
2135 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2138 static struct device_attribute NCR_700_active_tags_attr = {
2140 .name = "active_tags",
2143 .show = NCR_700_show_active_tags,
2146 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2147 &NCR_700_active_tags_attr,
2151 EXPORT_SYMBOL(NCR_700_detect);
2152 EXPORT_SYMBOL(NCR_700_release);
2153 EXPORT_SYMBOL(NCR_700_intr);
2155 static struct spi_function_template NCR_700_transport_functions = {
2156 .set_period = NCR_700_set_period,
2158 .set_offset = NCR_700_set_offset,
2162 static int __init NCR_700_init(void)
2164 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2165 if(!NCR_700_transport_template)
2170 static void __exit NCR_700_exit(void)
2172 spi_release_transport(NCR_700_transport_template);
2175 module_init(NCR_700_init);
2176 module_exit(NCR_700_exit);
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