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/config.h>
118 #include <linux/kernel.h>
119 #include <linux/types.h>
120 #include <linux/string.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/sched.h>
126 #include <linux/init.h>
127 #include <linux/proc_fs.h>
128 #include <linux/blkdev.h>
129 #include <linux/module.h>
130 #include <linux/interrupt.h>
132 #include <asm/system.h>
134 #include <asm/pgtable.h>
135 #include <asm/byteorder.h>
137 #include <scsi/scsi.h>
138 #include <scsi/scsi_cmnd.h>
139 #include <scsi/scsi_dbg.h>
140 #include <scsi/scsi_eh.h>
141 #include <scsi/scsi_host.h>
142 #include <scsi/scsi_tcq.h>
143 #include <scsi/scsi_transport.h>
144 #include <scsi/scsi_transport_spi.h>
148 /* NOTE: For 64 bit drivers there are points in the code where we use
149 * a non dereferenceable pointer to point to a structure in dma-able
150 * memory (which is 32 bits) so that we can use all of the structure
151 * operations but take the address at the end. This macro allows us
152 * to truncate the 64 bit pointer down to 32 bits without the compiler
154 #define to32bit(x) ((__u32)((unsigned long)(x)))
159 #define STATIC static
162 MODULE_AUTHOR("James Bottomley");
163 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
164 MODULE_LICENSE("GPL");
166 /* This is the script */
167 #include "53c700_d.h"
170 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
171 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_dev_reset(struct scsi_cmnd * SCpnt);
174 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
175 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
176 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
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 static __u8 NCR_700_SDTR_msg[] = {
240 0x01, /* Extended message */
241 0x03, /* Extended message Length */
242 0x01, /* SDTR Extended message */
247 /* This translates the SDTR message offset and period to a value
248 * which can be loaded into the SXFER_REG.
250 * NOTE: According to SCSI-2, the true transfer period (in ns) is
251 * actually four times this period value */
253 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
254 __u8 offset, __u8 period)
258 __u8 min_xferp = (hostdata->chip710
259 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
260 __u8 max_offset = (hostdata->chip710
261 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
266 if(period < hostdata->min_period) {
267 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
268 period = hostdata->min_period;
270 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
271 if(offset > max_offset) {
272 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
276 if(XFERP < min_xferp) {
277 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
281 return (offset & 0x0f) | (XFERP & 0x07)<<4;
285 NCR_700_get_SXFER(struct scsi_device *SDp)
287 struct NCR_700_Host_Parameters *hostdata =
288 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
290 return NCR_700_offset_period_to_sxfer(hostdata, spi_offset(SDp),
295 NCR_700_detect(struct scsi_host_template *tpnt,
296 struct NCR_700_Host_Parameters *hostdata)
298 dma_addr_t pScript, pSlots;
301 struct Scsi_Host *host;
302 static int banner = 0;
305 if(tpnt->sdev_attrs == NULL)
306 tpnt->sdev_attrs = NCR_700_dev_attrs;
308 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
309 &pScript, GFP_KERNEL);
311 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
315 script = (__u32 *)memory;
316 hostdata->msgin = memory + MSGIN_OFFSET;
317 hostdata->msgout = memory + MSGOUT_OFFSET;
318 hostdata->status = memory + STATUS_OFFSET;
319 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
320 * if this isn't sufficient separation to avoid dma flushing issues */
321 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
322 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
324 pSlots = pScript + SLOTS_OFFSET;
326 /* Fill in the missing routines from the host template */
327 tpnt->queuecommand = NCR_700_queuecommand;
328 tpnt->eh_abort_handler = NCR_700_abort;
329 tpnt->eh_device_reset_handler = NCR_700_dev_reset;
330 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
331 tpnt->eh_host_reset_handler = NCR_700_host_reset;
332 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
333 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
334 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
335 tpnt->use_clustering = ENABLE_CLUSTERING;
336 tpnt->slave_configure = NCR_700_slave_configure;
337 tpnt->slave_destroy = NCR_700_slave_destroy;
339 if(tpnt->name == NULL)
340 tpnt->name = "53c700";
341 if(tpnt->proc_name == NULL)
342 tpnt->proc_name = "53c700";
345 host = scsi_host_alloc(tpnt, 4);
348 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
349 * NCR_700_COMMAND_SLOTS_PER_HOST);
350 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
351 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
352 - (unsigned long)&hostdata->slots[0].SG[0]);
353 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
355 hostdata->free_list = &hostdata->slots[j];
357 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
358 hostdata->slots[j].state = NCR_700_SLOT_FREE;
361 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
362 script[j] = bS_to_host(SCRIPT[j]);
365 /* adjust all labels to be bus physical */
366 for(j = 0; j < PATCHES; j++) {
367 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
369 /* now patch up fixed addresses. */
370 script_patch_32(script, MessageLocation,
371 pScript + MSGOUT_OFFSET);
372 script_patch_32(script, StatusAddress,
373 pScript + STATUS_OFFSET);
374 script_patch_32(script, ReceiveMsgAddress,
375 pScript + MSGIN_OFFSET);
377 hostdata->script = script;
378 hostdata->pScript = pScript;
379 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
380 hostdata->state = NCR_700_HOST_FREE;
381 hostdata->cmd = NULL;
383 host->max_lun = NCR_700_MAX_LUNS;
384 BUG_ON(NCR_700_transport_template == NULL);
385 host->transportt = NCR_700_transport_template;
386 host->unique_id = hostdata->base;
387 host->base = hostdata->base;
388 hostdata->eh_complete = NULL;
389 host->hostdata[0] = (unsigned long)hostdata;
391 NCR_700_writeb(0xff, host, CTEST9_REG);
392 if(hostdata->chip710)
393 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
395 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
396 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
398 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
401 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
402 hostdata->chip710 ? "53c710" :
403 (hostdata->fast ? "53c700-66" : "53c700"),
404 hostdata->rev, hostdata->differential ?
405 "(Differential)" : "");
407 NCR_700_chip_reset(host);
413 NCR_700_release(struct Scsi_Host *host)
415 struct NCR_700_Host_Parameters *hostdata =
416 (struct NCR_700_Host_Parameters *)host->hostdata[0];
418 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
419 hostdata->script, hostdata->pScript);
424 NCR_700_identify(int can_disconnect, __u8 lun)
426 return IDENTIFY_BASE |
427 ((can_disconnect) ? 0x40 : 0) |
428 (lun & NCR_700_LUN_MASK);
432 * Function : static int data_residual (Scsi_Host *host)
434 * Purpose : return residual data count of what's in the chip. If you
435 * really want to know what this function is doing, it's almost a
436 * direct transcription of the algorithm described in the 53c710
437 * guide, except that the DBC and DFIFO registers are only 6 bits
440 * Inputs : host - SCSI host */
442 NCR_700_data_residual (struct Scsi_Host *host) {
443 struct NCR_700_Host_Parameters *hostdata =
444 (struct NCR_700_Host_Parameters *)host->hostdata[0];
445 int count, synchronous = 0;
448 if(hostdata->chip710) {
449 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
450 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
452 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
453 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
457 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
459 /* get the data direction */
460 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
465 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
467 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
471 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
472 if (sstat & SODL_REG_FULL)
474 if (synchronous && (sstat & SODR_REG_FULL))
479 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
484 /* print out the SCSI wires and corresponding phase from the SBCL register
487 sbcl_to_string(__u8 sbcl)
490 static char ret[256];
495 strcat(ret, NCR_700_SBCL_bits[i]);
497 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
502 bitmap_to_number(__u8 bitmap)
506 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
511 /* Pull a slot off the free list */
512 STATIC struct NCR_700_command_slot *
513 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
515 struct NCR_700_command_slot *slot = hostdata->free_list;
519 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
520 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
524 if(slot->state != NCR_700_SLOT_FREE)
526 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
529 hostdata->free_list = slot->ITL_forw;
530 slot->ITL_forw = NULL;
533 /* NOTE: set the state to busy here, not queued, since this
534 * indicates the slot is in use and cannot be run by the IRQ
535 * finish routine. If we cannot queue the command when it
536 * is properly build, we then change to NCR_700_SLOT_QUEUED */
537 slot->state = NCR_700_SLOT_BUSY;
538 hostdata->command_slot_count++;
544 free_slot(struct NCR_700_command_slot *slot,
545 struct NCR_700_Host_Parameters *hostdata)
547 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
548 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
550 if(slot->state == NCR_700_SLOT_FREE) {
551 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
554 slot->resume_offset = 0;
556 slot->state = NCR_700_SLOT_FREE;
557 slot->ITL_forw = hostdata->free_list;
558 hostdata->free_list = slot;
559 hostdata->command_slot_count--;
563 /* This routine really does very little. The command is indexed on
564 the ITL and (if tagged) the ITLQ lists in _queuecommand */
566 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
567 struct scsi_cmnd *SCp, __u32 dsp)
569 /* Its just possible that this gets executed twice */
571 struct NCR_700_command_slot *slot =
572 (struct NCR_700_command_slot *)SCp->host_scribble;
574 slot->resume_offset = dsp;
576 hostdata->state = NCR_700_HOST_FREE;
577 hostdata->cmd = NULL;
581 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
582 struct NCR_700_command_slot *slot)
584 if(SCp->sc_data_direction != DMA_NONE &&
585 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
587 dma_unmap_sg(hostdata->dev, SCp->buffer,
588 SCp->use_sg, SCp->sc_data_direction);
590 dma_unmap_single(hostdata->dev, slot->dma_handle,
591 SCp->request_bufflen,
592 SCp->sc_data_direction);
598 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
599 struct scsi_cmnd *SCp, int result)
601 hostdata->state = NCR_700_HOST_FREE;
602 hostdata->cmd = NULL;
605 struct NCR_700_command_slot *slot =
606 (struct NCR_700_command_slot *)SCp->host_scribble;
608 NCR_700_unmap(hostdata, SCp, slot);
609 dma_unmap_single(hostdata->dev, slot->pCmd,
610 sizeof(SCp->cmnd), DMA_TO_DEVICE);
611 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
613 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
614 SCp, SCp->cmnd[7], result);
615 scsi_print_sense("53c700", SCp);
618 /* restore the old result if the request sense was
621 result = SCp->cmnd[7];
622 /* now restore the original command */
623 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
624 sizeof(SCp->data_cmnd));
625 SCp->request_buffer = SCp->buffer;
626 SCp->request_bufflen = SCp->bufflen;
627 SCp->use_sg = SCp->old_use_sg;
628 SCp->cmd_len = SCp->old_cmd_len;
629 SCp->sc_data_direction = SCp->sc_old_data_direction;
630 SCp->underflow = SCp->old_underflow;
633 free_slot(slot, hostdata);
635 if(NCR_700_get_depth(SCp->device) == 0 ||
636 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
637 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
638 NCR_700_get_depth(SCp->device));
639 #endif /* NCR_700_DEBUG */
640 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
642 SCp->host_scribble = NULL;
643 SCp->result = result;
646 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
652 NCR_700_internal_bus_reset(struct Scsi_Host *host)
655 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
657 NCR_700_writeb(0, host, SCNTL1_REG);
662 NCR_700_chip_setup(struct Scsi_Host *host)
664 struct NCR_700_Host_Parameters *hostdata =
665 (struct NCR_700_Host_Parameters *)host->hostdata[0];
666 __u32 dcntl_extra = 0;
668 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
670 if(hostdata->chip710) {
671 __u8 burst_disable = hostdata->burst_disable
673 dcntl_extra = COMPAT_700_MODE;
675 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
676 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
677 host, DMODE_710_REG);
678 NCR_700_writeb(burst_disable | (hostdata->differential ?
679 DIFF : 0), host, CTEST7_REG);
680 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
681 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
682 | AUTO_ATN, host, SCNTL0_REG);
684 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
685 host, DMODE_700_REG);
686 NCR_700_writeb(hostdata->differential ?
687 DIFF : 0, host, CTEST7_REG);
689 /* this is for 700-66, does nothing on 700 */
690 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
691 | GENERATE_RECEIVE_PARITY, host,
694 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
695 | PARITY | AUTO_ATN, host, SCNTL0_REG);
699 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
700 NCR_700_writeb(0, host, SBCL_REG);
701 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
703 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
704 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
706 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
707 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
708 if(hostdata->clock > 75) {
709 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
710 /* do the best we can, but the async clock will be out
711 * of spec: sync divider 2, async divider 3 */
712 DEBUG(("53c700: sync 2 async 3\n"));
713 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
714 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
715 hostdata->sync_clock = hostdata->clock/2;
716 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
717 /* sync divider 1.5, async divider 3 */
718 DEBUG(("53c700: sync 1.5 async 3\n"));
719 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
720 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
721 hostdata->sync_clock = hostdata->clock*2;
722 hostdata->sync_clock /= 3;
724 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
725 /* sync divider 1, async divider 2 */
726 DEBUG(("53c700: sync 1 async 2\n"));
727 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
728 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
729 hostdata->sync_clock = hostdata->clock;
730 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
731 /* sync divider 1, async divider 1.5 */
732 DEBUG(("53c700: sync 1 async 1.5\n"));
733 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
734 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
735 hostdata->sync_clock = hostdata->clock;
737 DEBUG(("53c700: sync 1 async 1\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
740 /* sync divider 1, async divider 1 */
741 hostdata->sync_clock = hostdata->clock;
743 /* Calculate the actual minimum period that can be supported
744 * by our synchronous clock speed. See the 710 manual for
745 * exact details of this calculation which is based on a
746 * setting of the SXFER register */
747 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
748 hostdata->min_period = NCR_700_MIN_PERIOD;
749 if(min_period > NCR_700_MIN_PERIOD)
750 hostdata->min_period = min_period;
754 NCR_700_chip_reset(struct Scsi_Host *host)
756 struct NCR_700_Host_Parameters *hostdata =
757 (struct NCR_700_Host_Parameters *)host->hostdata[0];
758 if(hostdata->chip710) {
759 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
762 NCR_700_writeb(0, host, ISTAT_REG);
764 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
767 NCR_700_writeb(0, host, DCNTL_REG);
772 NCR_700_chip_setup(host);
775 /* The heart of the message processing engine is that the instruction
776 * immediately after the INT is the normal case (and so must be CLEAR
777 * ACK). If we want to do something else, we call that routine in
778 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
779 * ACK) so that the routine returns correctly to resume its activity
782 process_extended_message(struct Scsi_Host *host,
783 struct NCR_700_Host_Parameters *hostdata,
784 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
786 __u32 resume_offset = dsp, temp = dsp + 8;
787 __u8 pun = 0xff, lun = 0xff;
790 pun = SCp->device->id;
791 lun = SCp->device->lun;
794 switch(hostdata->msgin[2]) {
796 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
797 __u8 period = hostdata->msgin[3];
798 __u8 offset = hostdata->msgin[4];
800 if(offset == 0 || period == 0) {
805 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
806 if(spi_offset(SCp->device) != 0)
807 printk(KERN_INFO "scsi%d: (%d:%d) Synchronous at offset %d, period %dns\n",
808 host->host_no, pun, lun,
811 printk(KERN_INFO "scsi%d: (%d:%d) Asynchronous\n",
812 host->host_no, pun, lun);
813 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
816 spi_offset(SCp->device) = offset;
817 spi_period(SCp->device) = period;
820 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
821 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
823 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
827 /* SDTR message out of the blue, reject it */
828 printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
830 hostdata->msgout[0] = A_REJECT_MSG;
831 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
832 script_patch_16(hostdata->script, MessageCount, 1);
833 /* SendMsgOut returns, so set up the return
835 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
840 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
841 host->host_no, pun, lun);
842 hostdata->msgout[0] = A_REJECT_MSG;
843 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
844 script_patch_16(hostdata->script, MessageCount, 1);
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 scsi_print_msg(hostdata->msgin);
856 hostdata->msgout[0] = A_REJECT_MSG;
857 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
858 script_patch_16(hostdata->script, MessageCount, 1);
859 /* SendMsgOut returns, so set up the return
861 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
863 NCR_700_writel(temp, host, TEMP_REG);
864 return resume_offset;
868 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
869 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
871 /* work out where to return to */
872 __u32 temp = dsp + 8, resume_offset = dsp;
873 __u8 pun = 0xff, lun = 0xff;
876 pun = SCp->device->id;
877 lun = SCp->device->lun;
881 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
882 NCR_700_phase[(dsps & 0xf00) >> 8]);
883 scsi_print_msg(hostdata->msgin);
887 switch(hostdata->msgin[0]) {
890 resume_offset = process_extended_message(host, hostdata, SCp,
895 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
896 /* Rejected our sync negotiation attempt */
897 spi_period(SCp->device) = spi_offset(SCp->device) = 0;
898 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
899 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
900 } else if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING)) {
901 /* rejected our first simple tag message */
902 printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
903 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
904 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
905 SCp->device->tagged_supported = 0;
906 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
908 printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
909 host->host_no, pun, lun,
910 NCR_700_phase[(dsps & 0xf00) >> 8]);
911 /* however, just ignore it */
915 case A_PARITY_ERROR_MSG:
916 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
918 NCR_700_internal_bus_reset(host);
920 case A_SIMPLE_TAG_MSG:
921 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
922 pun, lun, hostdata->msgin[1],
923 NCR_700_phase[(dsps & 0xf00) >> 8]);
927 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
928 host->host_no, pun, lun,
929 NCR_700_phase[(dsps & 0xf00) >> 8]);
931 scsi_print_msg(hostdata->msgin);
934 hostdata->msgout[0] = A_REJECT_MSG;
935 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
936 script_patch_16(hostdata->script, MessageCount, 1);
937 /* SendMsgOut returns, so set up the return
939 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
943 NCR_700_writel(temp, host, TEMP_REG);
944 /* set us up to receive another message */
945 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
946 return resume_offset;
950 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
951 struct Scsi_Host *host,
952 struct NCR_700_Host_Parameters *hostdata)
954 __u32 resume_offset = 0;
955 __u8 pun = 0xff, lun=0xff;
958 pun = SCp->device->id;
959 lun = SCp->device->lun;
962 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
963 DEBUG((" COMMAND COMPLETE, status=%02x\n",
964 hostdata->status[0]));
965 /* OK, if TCQ still on, we know it works */
966 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
967 /* check for contingent allegiance contitions */
968 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
969 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
970 struct NCR_700_command_slot *slot =
971 (struct NCR_700_command_slot *)SCp->host_scribble;
972 if(SCp->cmnd[0] == REQUEST_SENSE) {
973 /* OOPS: bad device, returning another
974 * contingent allegiance condition */
975 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
976 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
979 scsi_print_command(SCp);
980 printk(" cmd %p has status %d, requesting sense\n",
981 SCp, hostdata->status[0]);
983 /* we can destroy the command here
984 * because the contingent allegiance
985 * condition will cause a retry which
986 * will re-copy the command from the
987 * saved data_cmnd. We also unmap any
988 * data associated with the command
990 NCR_700_unmap(hostdata, SCp, slot);
992 SCp->cmnd[0] = REQUEST_SENSE;
993 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
996 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
999 /* Here's a quiet hack: the
1000 * REQUEST_SENSE command is six bytes,
1001 * so store a flag indicating that
1002 * this was an internal sense request
1003 * and the original status at the end
1005 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1006 SCp->cmnd[7] = hostdata->status[0];
1008 SCp->sc_data_direction = DMA_FROM_DEVICE;
1009 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1010 SCp->cmd_len, DMA_TO_DEVICE);
1011 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1012 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1013 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1014 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1015 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1016 slot->SG[1].pAddr = 0;
1017 slot->resume_offset = hostdata->pScript;
1018 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1019 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1021 /* queue the command for reissue */
1022 slot->state = NCR_700_SLOT_QUEUED;
1023 hostdata->state = NCR_700_HOST_FREE;
1024 hostdata->cmd = NULL;
1027 // Currently rely on the mid layer evaluation
1028 // of the tag queuing capability
1030 //if(status_byte(hostdata->status[0]) == GOOD &&
1031 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1032 // /* Piggy back the tag queueing support
1033 // * on this command */
1034 // dma_sync_single_for_cpu(hostdata->dev,
1035 // slot->dma_handle,
1036 // SCp->request_bufflen,
1037 // DMA_FROM_DEVICE);
1038 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1039 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1040 // hostdata->tag_negotiated |= (1<<SCp->device->id);
1041 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1043 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1044 // hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1047 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1049 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1050 __u8 i = (dsps & 0xf00) >> 8;
1052 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1053 host->host_no, pun, lun,
1055 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1056 printk(KERN_ERR " len = %d, cmd =", SCp->cmd_len);
1057 scsi_print_command(SCp);
1059 NCR_700_internal_bus_reset(host);
1060 } else if((dsps & 0xfffff000) == A_FATAL) {
1061 int i = (dsps & 0xfff);
1063 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1064 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1065 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1066 printk(KERN_ERR " msg begins %02x %02x\n",
1067 hostdata->msgin[0], hostdata->msgin[1]);
1069 NCR_700_internal_bus_reset(host);
1070 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1071 #ifdef NCR_700_DEBUG
1072 __u8 i = (dsps & 0xf00) >> 8;
1074 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1075 host->host_no, pun, lun,
1076 i, NCR_700_phase[i]);
1078 save_for_reselection(hostdata, SCp, dsp);
1080 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1082 struct NCR_700_command_slot *slot;
1083 __u8 reselection_id = hostdata->reselection_id;
1084 struct scsi_device *SDp;
1086 lun = hostdata->msgin[0] & 0x1f;
1088 hostdata->reselection_id = 0xff;
1089 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1090 host->host_no, reselection_id, lun));
1091 /* clear the reselection indicator */
1092 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1093 if(unlikely(SDp == NULL)) {
1094 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1095 host->host_no, reselection_id, lun);
1098 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1099 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1100 if(unlikely(SCp == NULL)) {
1101 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1102 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1106 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1107 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1108 host->host_no, SDp->id, SDp->lun,
1109 hostdata->msgin[2], slot, slot->tag));
1111 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1112 if(unlikely(SCp == NULL)) {
1113 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n",
1114 host->host_no, reselection_id, lun);
1117 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1121 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1122 host->host_no, reselection_id, lun,
1123 hostdata->msgin[0], hostdata->msgin[1],
1124 hostdata->msgin[2]);
1126 if(hostdata->state != NCR_700_HOST_BUSY)
1127 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1129 resume_offset = slot->resume_offset;
1130 hostdata->cmd = slot->cmnd;
1132 /* re-patch for this command */
1133 script_patch_32_abs(hostdata->script, CommandAddress,
1135 script_patch_16(hostdata->script,
1136 CommandCount, slot->cmnd->cmd_len);
1137 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1138 to32bit(&slot->pSG[0].ins));
1140 /* Note: setting SXFER only works if we're
1141 * still in the MESSAGE phase, so it is vital
1142 * that ACK is still asserted when we process
1143 * the reselection message. The resume offset
1144 * should therefore always clear ACK */
1145 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1147 dma_cache_sync(hostdata->msgin,
1148 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1149 dma_cache_sync(hostdata->msgout,
1150 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1151 /* I'm just being paranoid here, the command should
1152 * already have been flushed from the cache */
1153 dma_cache_sync(slot->cmnd->cmnd,
1154 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1159 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1161 /* This section is full of debugging code because I've
1162 * never managed to reach it. I think what happens is
1163 * that, because the 700 runs with selection
1164 * interrupts enabled the whole time that we take a
1165 * selection interrupt before we manage to get to the
1166 * reselected script interrupt */
1168 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1169 struct NCR_700_command_slot *slot;
1171 /* Take out our own ID */
1172 reselection_id &= ~(1<<host->this_id);
1174 /* I've never seen this happen, so keep this as a printk rather
1176 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1177 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1180 /* FIXME: DEBUGGING CODE */
1181 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1184 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1185 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1186 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1189 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);
1190 SCp = hostdata->slots[i].cmnd;
1194 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1195 /* change slot from busy to queued to redo command */
1196 slot->state = NCR_700_SLOT_QUEUED;
1198 hostdata->cmd = NULL;
1200 if(reselection_id == 0) {
1201 if(hostdata->reselection_id == 0xff) {
1202 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1205 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1207 reselection_id = hostdata->reselection_id;
1211 /* convert to real ID */
1212 reselection_id = bitmap_to_number(reselection_id);
1214 hostdata->reselection_id = reselection_id;
1215 /* just in case we have a stale simple tag message, clear it */
1216 hostdata->msgin[1] = 0;
1217 dma_cache_sync(hostdata->msgin,
1218 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1219 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1220 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1222 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1224 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1225 /* we've just disconnected from the bus, do nothing since
1226 * a return here will re-run the queued command slot
1227 * that may have been interrupted by the initial selection */
1228 DEBUG((" SELECTION COMPLETED\n"));
1229 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1230 resume_offset = process_message(host, hostdata, SCp,
1232 } else if((dsps & 0xfffff000) == 0) {
1233 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1234 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1235 host->host_no, pun, lun, NCR_700_condition[i],
1236 NCR_700_phase[j], dsp - hostdata->pScript);
1238 scsi_print_command(SCp);
1241 for(i = 0; i < SCp->use_sg + 1; i++) {
1242 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1246 NCR_700_internal_bus_reset(host);
1247 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1248 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1249 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1250 resume_offset = dsp;
1252 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1253 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1254 NCR_700_internal_bus_reset(host);
1256 return resume_offset;
1259 /* We run the 53c700 with selection interrupts always enabled. This
1260 * means that the chip may be selected as soon as the bus frees. On a
1261 * busy bus, this can be before the scripts engine finishes its
1262 * processing. Therefore, part of the selection processing has to be
1263 * to find out what the scripts engine is doing and complete the
1264 * function if necessary (i.e. process the pending disconnect or save
1265 * the interrupted initial selection */
1267 process_selection(struct Scsi_Host *host, __u32 dsp)
1269 __u8 id = 0; /* Squash compiler warning */
1271 __u32 resume_offset = 0;
1272 struct NCR_700_Host_Parameters *hostdata =
1273 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1274 struct scsi_cmnd *SCp = hostdata->cmd;
1277 for(count = 0; count < 5; count++) {
1278 id = NCR_700_readb(host, hostdata->chip710 ?
1279 CTEST9_REG : SFBR_REG);
1281 /* Take out our own ID */
1282 id &= ~(1<<host->this_id);
1287 sbcl = NCR_700_readb(host, SBCL_REG);
1288 if((sbcl & SBCL_IO) == 0) {
1289 /* mark as having been selected rather than reselected */
1292 /* convert to real ID */
1293 hostdata->reselection_id = id = bitmap_to_number(id);
1294 DEBUG(("scsi%d: Reselected by %d\n",
1295 host->host_no, id));
1297 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1298 struct NCR_700_command_slot *slot =
1299 (struct NCR_700_command_slot *)SCp->host_scribble;
1300 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));
1302 switch(dsp - hostdata->pScript) {
1303 case Ent_Disconnect1:
1304 case Ent_Disconnect2:
1305 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1307 case Ent_Disconnect3:
1308 case Ent_Disconnect4:
1309 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1311 case Ent_Disconnect5:
1312 case Ent_Disconnect6:
1313 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1315 case Ent_Disconnect7:
1316 case Ent_Disconnect8:
1317 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1321 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1325 slot->state = NCR_700_SLOT_QUEUED;
1329 hostdata->state = NCR_700_HOST_BUSY;
1330 hostdata->cmd = NULL;
1331 /* clear any stale simple tag message */
1332 hostdata->msgin[1] = 0;
1333 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1337 /* Selected as target, Ignore */
1338 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1339 } else if(hostdata->tag_negotiated & (1<<id)) {
1340 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1342 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1344 return resume_offset;
1348 NCR_700_clear_fifo(struct Scsi_Host *host) {
1349 const struct NCR_700_Host_Parameters *hostdata
1350 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1351 if(hostdata->chip710) {
1352 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1354 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1359 NCR_700_flush_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(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1365 NCR_700_writeb(0, host, CTEST8_REG);
1367 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1369 NCR_700_writeb(0, host, DFIFO_REG);
1374 /* The queue lock with interrupts disabled must be held on entry to
1377 NCR_700_start_command(struct scsi_cmnd *SCp)
1379 struct NCR_700_command_slot *slot =
1380 (struct NCR_700_command_slot *)SCp->host_scribble;
1381 struct NCR_700_Host_Parameters *hostdata =
1382 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1383 __u16 count = 1; /* for IDENTIFY message */
1385 if(hostdata->state != NCR_700_HOST_FREE) {
1386 /* keep this inside the lock to close the race window where
1387 * the running command finishes on another CPU while we don't
1388 * change the state to queued on this one */
1389 slot->state = NCR_700_SLOT_QUEUED;
1391 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1392 SCp->device->host->host_no, slot->cmnd, slot));
1395 hostdata->state = NCR_700_HOST_BUSY;
1396 hostdata->cmd = SCp;
1397 slot->state = NCR_700_SLOT_BUSY;
1398 /* keep interrupts disabled until we have the command correctly
1399 * set up so we cannot take a selection interrupt */
1401 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1403 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1404 * if the negotiated transfer parameters still hold, so
1405 * always renegotiate them */
1406 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1407 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1410 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1411 * If a contingent allegiance condition exists, the device
1412 * will refuse all tags, so send the request sense as untagged
1414 if((hostdata->tag_negotiated & (1<<SCp->device->id))
1415 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1416 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1419 if(hostdata->fast &&
1420 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1421 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1422 sizeof(NCR_700_SDTR_msg));
1423 hostdata->msgout[count+3] = spi_period(SCp->device);
1424 hostdata->msgout[count+4] = spi_offset(SCp->device);
1425 count += sizeof(NCR_700_SDTR_msg);
1426 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1429 script_patch_16(hostdata->script, MessageCount, count);
1432 script_patch_ID(hostdata->script,
1433 Device_ID, 1<<SCp->device->id);
1435 script_patch_32_abs(hostdata->script, CommandAddress,
1437 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1438 /* finally plumb the beginning of the SG list into the script
1440 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1441 to32bit(&slot->pSG[0].ins));
1442 NCR_700_clear_fifo(SCp->device->host);
1444 if(slot->resume_offset == 0)
1445 slot->resume_offset = hostdata->pScript;
1446 /* now perform all the writebacks and invalidates */
1447 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1448 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1450 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1451 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1453 /* set the synchronous period/offset */
1454 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1455 SCp->device->host, SXFER_REG);
1456 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1457 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1463 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1465 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1466 struct NCR_700_Host_Parameters *hostdata =
1467 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1469 __u32 resume_offset = 0;
1470 __u8 pun = 0xff, lun = 0xff;
1471 unsigned long flags;
1474 /* Use the host lock to serialise acess to the 53c700
1475 * hardware. Note: In future, we may need to take the queue
1476 * lock to enter the done routines. When that happens, we
1477 * need to ensure that for this driver, the host lock and the
1478 * queue lock point to the same thing. */
1479 spin_lock_irqsave(host->host_lock, flags);
1480 if((istat = NCR_700_readb(host, ISTAT_REG))
1481 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1483 __u8 sstat0 = 0, dstat = 0;
1485 struct scsi_cmnd *SCp = hostdata->cmd;
1486 enum NCR_700_Host_State state;
1489 state = hostdata->state;
1490 SCp = hostdata->cmd;
1492 if(istat & SCSI_INT_PENDING) {
1495 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1498 if(istat & DMA_INT_PENDING) {
1501 dstat = NCR_700_readb(host, DSTAT_REG);
1504 dsps = NCR_700_readl(host, DSPS_REG);
1505 dsp = NCR_700_readl(host, DSP_REG);
1507 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1508 host->host_no, istat, sstat0, dstat,
1509 (dsp - (__u32)(hostdata->pScript))/4,
1513 pun = SCp->device->id;
1514 lun = SCp->device->lun;
1517 if(sstat0 & SCSI_RESET_DETECTED) {
1518 struct scsi_device *SDp;
1521 hostdata->state = NCR_700_HOST_BUSY;
1523 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1524 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1526 scsi_report_bus_reset(host, 0);
1528 /* clear all the negotiated parameters */
1529 __shost_for_each_device(SDp, host)
1530 SDp->hostdata = NULL;
1532 /* clear all the slots and their pending commands */
1533 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1534 struct scsi_cmnd *SCp;
1535 struct NCR_700_command_slot *slot =
1536 &hostdata->slots[i];
1538 if(slot->state == NCR_700_SLOT_FREE)
1542 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1544 free_slot(slot, hostdata);
1545 SCp->host_scribble = NULL;
1546 NCR_700_set_depth(SCp->device, 0);
1547 /* NOTE: deadlock potential here: we
1548 * rely on mid-layer guarantees that
1549 * scsi_done won't try to issue the
1550 * command again otherwise we'll
1552 * hostdata->state_lock */
1553 SCp->result = DID_RESET << 16;
1554 SCp->scsi_done(SCp);
1557 NCR_700_chip_setup(host);
1559 hostdata->state = NCR_700_HOST_FREE;
1560 hostdata->cmd = NULL;
1561 /* signal back if this was an eh induced reset */
1562 if(hostdata->eh_complete != NULL)
1563 complete(hostdata->eh_complete);
1565 } else if(sstat0 & SELECTION_TIMEOUT) {
1566 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1567 host->host_no, pun, lun));
1568 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1569 } else if(sstat0 & PHASE_MISMATCH) {
1570 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1571 (struct NCR_700_command_slot *)SCp->host_scribble;
1573 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1574 /* It wants to reply to some part of
1576 #ifdef NCR_700_DEBUG
1577 __u32 temp = NCR_700_readl(host, TEMP_REG);
1578 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1579 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)));
1581 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1582 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1583 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1584 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1585 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1586 int residual = NCR_700_data_residual(host);
1588 #ifdef NCR_700_DEBUG
1589 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1591 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1592 host->host_no, pun, lun,
1593 SGcount, data_transfer);
1594 scsi_print_command(SCp);
1596 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1597 host->host_no, pun, lun,
1598 SGcount, data_transfer, residual);
1601 data_transfer += residual;
1603 if(data_transfer != 0) {
1609 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1610 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1611 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1612 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1613 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1614 pAddr += (count - data_transfer);
1615 #ifdef NCR_700_DEBUG
1616 if(pAddr != naddr) {
1617 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);
1620 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1622 /* set the executed moves to nops */
1623 for(i=0; i<SGcount; i++) {
1624 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1625 slot->SG[i].pAddr = 0;
1627 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1628 /* and pretend we disconnected after
1629 * the command phase */
1630 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1631 /* make sure all the data is flushed */
1632 NCR_700_flush_fifo(host);
1634 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1635 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1636 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1637 NCR_700_internal_bus_reset(host);
1640 } else if(sstat0 & SCSI_GROSS_ERROR) {
1641 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1642 host->host_no, pun, lun);
1643 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1644 } else if(sstat0 & PARITY_ERROR) {
1645 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1646 host->host_no, pun, lun);
1647 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1648 } else if(dstat & SCRIPT_INT_RECEIVED) {
1649 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1650 host->host_no, pun, lun));
1651 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1652 } else if(dstat & (ILGL_INST_DETECTED)) {
1653 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1654 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1655 host->host_no, pun, lun,
1656 dsp, dsp - hostdata->pScript);
1657 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1658 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1660 host->host_no, pun, lun, dstat);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1665 /* NOTE: selection interrupt processing MUST occur
1666 * after script interrupt processing to correctly cope
1667 * with the case where we process a disconnect and
1668 * then get reselected before we process the
1670 if(sstat0 & SELECTED) {
1671 /* FIXME: It currently takes at least FOUR
1672 * interrupts to complete a command that
1673 * disconnects: one for the disconnect, one
1674 * for the reselection, one to get the
1675 * reselection data and one to complete the
1676 * command. If we guess the reselected
1677 * command here and prepare it, we only need
1678 * to get a reselection data interrupt if we
1679 * guessed wrongly. Since the interrupt
1680 * overhead is much greater than the command
1681 * setup, this would be an efficient
1682 * optimisation particularly as we probably
1683 * only have one outstanding command on a
1684 * target most of the time */
1686 resume_offset = process_selection(host, dsp);
1693 if(hostdata->state != NCR_700_HOST_BUSY) {
1694 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1695 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1696 hostdata->state = NCR_700_HOST_BUSY;
1699 DEBUG(("Attempting to resume at %x\n", resume_offset));
1700 NCR_700_clear_fifo(host);
1701 NCR_700_writel(resume_offset, host, DSP_REG);
1703 /* There is probably a technical no-no about this: If we're a
1704 * shared interrupt and we got this interrupt because the
1705 * other device needs servicing not us, we're still going to
1706 * check our queued commands here---of course, there shouldn't
1707 * be any outstanding.... */
1708 if(hostdata->state == NCR_700_HOST_FREE) {
1711 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1712 /* fairness: always run the queue from the last
1713 * position we left off */
1714 int j = (i + hostdata->saved_slot_position)
1715 % NCR_700_COMMAND_SLOTS_PER_HOST;
1717 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1719 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1720 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1721 host->host_no, &hostdata->slots[j],
1722 hostdata->slots[j].cmnd));
1723 hostdata->saved_slot_position = j + 1;
1730 spin_unlock_irqrestore(host->host_lock, flags);
1731 return IRQ_RETVAL(handled);
1735 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1737 struct NCR_700_Host_Parameters *hostdata =
1738 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1740 enum dma_data_direction direction;
1741 struct NCR_700_command_slot *slot;
1743 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1744 /* We're over our allocation, this should never happen
1745 * since we report the max allocation to the mid layer */
1746 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1749 /* check for untagged commands. We cannot have any outstanding
1750 * commands if we accept them. Commands could be untagged because:
1752 * - The tag negotiated bitmap is clear
1753 * - The blk layer sent and untagged command
1755 if(NCR_700_get_depth(SCp->device) != 0
1756 && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
1757 || !blk_rq_tagged(SCp->request))) {
1758 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
1759 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1760 NCR_700_get_depth(SCp->device)));
1761 return SCSI_MLQUEUE_DEVICE_BUSY;
1763 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1764 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
1765 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1766 NCR_700_get_depth(SCp->device)));
1767 return SCSI_MLQUEUE_DEVICE_BUSY;
1769 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1771 /* begin the command here */
1772 /* no need to check for NULL, test for command_slot_count above
1773 * ensures a slot is free */
1774 slot = find_empty_slot(hostdata);
1778 SCp->scsi_done = done;
1779 SCp->host_scribble = (unsigned char *)slot;
1780 SCp->SCp.ptr = NULL;
1781 SCp->SCp.buffer = NULL;
1783 #ifdef NCR_700_DEBUG
1784 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1785 scsi_print_command(SCp);
1787 if(SCp->device->tagged_supported && !SCp->device->simple_tags
1788 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0
1789 && NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING)) {
1790 /* upper layer has indicated tags are supported. We don't
1791 * necessarily believe it yet.
1793 * NOTE: There is a danger here: the mid layer supports
1794 * tag queuing per LUN. We only support it per PUN because
1795 * of potential reselection issues */
1796 scsi_activate_tcq(SCp->device, NCR_700_DEFAULT_TAGS);
1799 if(blk_rq_tagged(SCp->request)
1800 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0) {
1801 printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1802 hostdata->tag_negotiated |= (1<<SCp->device->id);
1803 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1806 /* here we may have to process an untagged command. The gate
1807 * above ensures that this will be the only one outstanding,
1808 * so clear the tag negotiated bit.
1810 * FIXME: This will royally screw up on multiple LUN devices
1812 if(!blk_rq_tagged(SCp->request)
1813 && (hostdata->tag_negotiated &(1<<SCp->device->id))) {
1814 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1815 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1818 if((hostdata->tag_negotiated &(1<<SCp->device->id))) {
1819 slot->tag = SCp->request->tag;
1820 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1821 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
1824 slot->tag = SCSI_NO_TAG;
1825 /* must populate current_cmnd for scsi_find_tag to work */
1826 SCp->device->current_cmnd = SCp;
1828 /* sanity check: some of the commands generated by the mid-layer
1829 * have an eccentric idea of their sc_data_direction */
1830 if(!SCp->use_sg && !SCp->request_bufflen
1831 && SCp->sc_data_direction != DMA_NONE) {
1832 #ifdef NCR_700_DEBUG
1833 printk("53c700: Command");
1834 scsi_print_command(SCp);
1835 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1837 SCp->sc_data_direction = DMA_NONE;
1840 switch (SCp->cmnd[0]) {
1842 /* clear the internal sense magic */
1846 /* OK, get it from the command */
1847 switch(SCp->sc_data_direction) {
1848 case DMA_BIDIRECTIONAL:
1850 printk(KERN_ERR "53c700: Unknown command for data direction ");
1851 scsi_print_command(SCp);
1858 case DMA_FROM_DEVICE:
1859 move_ins = SCRIPT_MOVE_DATA_IN;
1862 move_ins = SCRIPT_MOVE_DATA_OUT;
1867 /* now build the scatter gather list */
1868 direction = SCp->sc_data_direction;
1872 dma_addr_t vPtr = 0;
1876 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1877 SCp->use_sg, direction);
1879 vPtr = dma_map_single(hostdata->dev,
1880 SCp->request_buffer,
1881 SCp->request_bufflen,
1883 count = SCp->request_bufflen;
1884 slot->dma_handle = vPtr;
1889 for(i = 0; i < sg_count; i++) {
1892 struct scatterlist *sg = SCp->buffer;
1894 vPtr = sg_dma_address(&sg[i]);
1895 count = sg_dma_len(&sg[i]);
1898 slot->SG[i].ins = bS_to_host(move_ins | count);
1899 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1900 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1901 slot->SG[i].pAddr = bS_to_host(vPtr);
1903 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1904 slot->SG[i].pAddr = 0;
1905 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1906 DEBUG((" SETTING %08lx to %x\n",
1907 (&slot->pSG[i].ins),
1910 slot->resume_offset = 0;
1911 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1912 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1913 NCR_700_start_command(SCp);
1918 NCR_700_abort(struct scsi_cmnd * SCp)
1920 struct NCR_700_command_slot *slot;
1922 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
1923 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1924 scsi_print_command(SCp);
1926 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1929 /* no outstanding command to abort */
1931 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1932 /* FIXME: This is because of a problem in the new
1933 * error handler. When it is in error recovery, it
1934 * will send a TUR to a device it thinks may still be
1935 * showing a problem. If the TUR isn't responded to,
1936 * it will abort it and mark the device off line.
1937 * Unfortunately, it does no other error recovery, so
1938 * this would leave us with an outstanding command
1939 * occupying a slot. Rather than allow this to
1940 * happen, we issue a bus reset to force all
1941 * outstanding commands to terminate here. */
1942 NCR_700_internal_bus_reset(SCp->device->host);
1943 /* still drop through and return failed */
1950 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1952 DECLARE_COMPLETION(complete);
1953 struct NCR_700_Host_Parameters *hostdata =
1954 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1956 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1957 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
1958 scsi_print_command(SCp);
1959 /* In theory, eh_complete should always be null because the
1960 * eh is single threaded, but just in case we're handling a
1961 * reset via sg or something */
1962 while(hostdata->eh_complete != NULL) {
1963 spin_unlock_irq(SCp->device->host->host_lock);
1964 schedule_timeout(HZ/10);
1965 spin_lock_irq(SCp->device->host->host_lock);
1967 hostdata->eh_complete = &complete;
1968 NCR_700_internal_bus_reset(SCp->device->host);
1969 spin_unlock_irq(SCp->device->host->host_lock);
1970 wait_for_completion(&complete);
1971 spin_lock_irq(SCp->device->host->host_lock);
1972 hostdata->eh_complete = NULL;
1973 /* Revalidate the transport parameters of the failing device */
1975 spi_schedule_dv_device(SCp->device);
1980 NCR_700_dev_reset(struct scsi_cmnd * SCp)
1982 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants device reset\n\t",
1983 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1984 scsi_print_command(SCp);
1990 NCR_700_host_reset(struct scsi_cmnd * SCp)
1992 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
1993 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1994 scsi_print_command(SCp);
1996 NCR_700_internal_bus_reset(SCp->device->host);
1997 NCR_700_chip_reset(SCp->device->host);
2002 NCR_700_set_period(struct scsi_device *SDp, int period)
2004 struct NCR_700_Host_Parameters *hostdata =
2005 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2010 if(period < hostdata->min_period)
2011 period = hostdata->min_period;
2013 spi_period(SDp) = period;
2014 NCR_700_clear_flag(SDp, NCR_700_DEV_NEGOTIATED_SYNC);
2015 NCR_700_clear_flag(SDp, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2016 NCR_700_set_flag(SDp, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
2020 NCR_700_set_offset(struct scsi_device *SDp, int offset)
2022 struct NCR_700_Host_Parameters *hostdata =
2023 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2024 int max_offset = hostdata->chip710
2025 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2030 if(offset > max_offset)
2031 offset = max_offset;
2033 /* if we're currently async, make sure the period is reasonable */
2034 if(spi_offset(SDp) == 0 && (spi_period(SDp) < hostdata->min_period ||
2035 spi_period(SDp) > 0xff))
2036 spi_period(SDp) = hostdata->min_period;
2038 spi_offset(SDp) = offset;
2039 NCR_700_clear_flag(SDp, NCR_700_DEV_NEGOTIATED_SYNC);
2040 NCR_700_clear_flag(SDp, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2041 NCR_700_set_flag(SDp, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
2047 NCR_700_slave_configure(struct scsi_device *SDp)
2049 struct NCR_700_Host_Parameters *hostdata =
2050 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2052 /* to do here: allocate memory; build a queue_full list */
2053 if(SDp->tagged_supported) {
2054 /* do TCQ stuff here */
2056 /* initialise to default depth */
2057 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2059 if(hostdata->fast) {
2060 /* Find the correct offset and period via domain validation */
2063 spi_offset(SDp) = 0;
2064 spi_period(SDp) = 0;
2070 NCR_700_slave_destroy(struct scsi_device *SDp)
2072 /* to do here: deallocate memory */
2076 NCR_700_store_queue_depth(struct device *dev, const char *buf, size_t count)
2080 struct scsi_device *SDp = to_scsi_device(dev);
2081 depth = simple_strtoul(buf, NULL, 0);
2082 if(depth > NCR_700_MAX_TAGS)
2084 scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, depth);
2090 NCR_700_show_active_tags(struct device *dev, char *buf)
2092 struct scsi_device *SDp = to_scsi_device(dev);
2094 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2097 static struct device_attribute NCR_700_queue_depth_attr = {
2099 .name = "queue_depth",
2102 .store = NCR_700_store_queue_depth,
2105 static struct device_attribute NCR_700_active_tags_attr = {
2107 .name = "active_tags",
2110 .show = NCR_700_show_active_tags,
2113 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2114 &NCR_700_queue_depth_attr,
2115 &NCR_700_active_tags_attr,
2119 EXPORT_SYMBOL(NCR_700_detect);
2120 EXPORT_SYMBOL(NCR_700_release);
2121 EXPORT_SYMBOL(NCR_700_intr);
2123 static struct spi_function_template NCR_700_transport_functions = {
2124 .set_period = NCR_700_set_period,
2126 .set_offset = NCR_700_set_offset,
2130 static int __init NCR_700_init(void)
2132 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2133 if(!NCR_700_transport_template)
2138 static void __exit NCR_700_exit(void)
2140 spi_release_transport(NCR_700_transport_template);
2143 module_init(NCR_700_init);
2144 module_exit(NCR_700_exit);