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,
291 spi_offset(SDp->sdev_target),
292 spi_period(SDp->sdev_target));
296 NCR_700_detect(struct scsi_host_template *tpnt,
297 struct NCR_700_Host_Parameters *hostdata, struct device *dev,
298 unsigned long irq, u8 scsi_id)
300 dma_addr_t pScript, pSlots;
303 struct Scsi_Host *host;
304 static int banner = 0;
307 if(tpnt->sdev_attrs == NULL)
308 tpnt->sdev_attrs = NCR_700_dev_attrs;
310 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
311 &pScript, GFP_KERNEL);
313 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
317 script = (__u32 *)memory;
318 hostdata->msgin = memory + MSGIN_OFFSET;
319 hostdata->msgout = memory + MSGOUT_OFFSET;
320 hostdata->status = memory + STATUS_OFFSET;
321 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
322 * if this isn't sufficient separation to avoid dma flushing issues */
323 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
324 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
327 pSlots = pScript + SLOTS_OFFSET;
329 /* Fill in the missing routines from the host template */
330 tpnt->queuecommand = NCR_700_queuecommand;
331 tpnt->eh_abort_handler = NCR_700_abort;
332 tpnt->eh_device_reset_handler = NCR_700_dev_reset;
333 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
334 tpnt->eh_host_reset_handler = NCR_700_host_reset;
335 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
336 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
337 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
338 tpnt->use_clustering = ENABLE_CLUSTERING;
339 tpnt->slave_configure = NCR_700_slave_configure;
340 tpnt->slave_destroy = NCR_700_slave_destroy;
342 if(tpnt->name == NULL)
343 tpnt->name = "53c700";
344 if(tpnt->proc_name == NULL)
345 tpnt->proc_name = "53c700";
348 host = scsi_host_alloc(tpnt, 4);
351 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
352 * NCR_700_COMMAND_SLOTS_PER_HOST);
353 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
354 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
355 - (unsigned long)&hostdata->slots[0].SG[0]);
356 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
358 hostdata->free_list = &hostdata->slots[j];
360 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
361 hostdata->slots[j].state = NCR_700_SLOT_FREE;
364 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
365 script[j] = bS_to_host(SCRIPT[j]);
368 /* adjust all labels to be bus physical */
369 for(j = 0; j < PATCHES; j++) {
370 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
372 /* now patch up fixed addresses. */
373 script_patch_32(script, MessageLocation,
374 pScript + MSGOUT_OFFSET);
375 script_patch_32(script, StatusAddress,
376 pScript + STATUS_OFFSET);
377 script_patch_32(script, ReceiveMsgAddress,
378 pScript + MSGIN_OFFSET);
380 hostdata->script = script;
381 hostdata->pScript = pScript;
382 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
383 hostdata->state = NCR_700_HOST_FREE;
384 hostdata->cmd = NULL;
386 host->max_lun = NCR_700_MAX_LUNS;
387 BUG_ON(NCR_700_transport_template == NULL);
388 host->transportt = NCR_700_transport_template;
389 host->unique_id = hostdata->base;
390 host->base = hostdata->base;
391 hostdata->eh_complete = NULL;
393 host->this_id = scsi_id;
394 host->hostdata[0] = (unsigned long)hostdata;
396 NCR_700_writeb(0xff, host, CTEST9_REG);
397 if(hostdata->chip710)
398 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
400 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
401 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
403 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
406 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
407 hostdata->chip710 ? "53c710" :
408 (hostdata->fast ? "53c700-66" : "53c700"),
409 hostdata->rev, hostdata->differential ?
410 "(Differential)" : "");
412 NCR_700_chip_reset(host);
414 if (request_irq(irq, NCR_700_intr, SA_SHIRQ, dev->bus_id, host)) {
415 dev_printk(KERN_ERR, dev, "53c700: irq %lu request failed\n ",
420 if (scsi_add_host(host, dev)) {
421 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
422 goto out_release_irq;
425 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
439 NCR_700_release(struct Scsi_Host *host)
441 struct NCR_700_Host_Parameters *hostdata =
442 (struct NCR_700_Host_Parameters *)host->hostdata[0];
444 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
445 hostdata->script, hostdata->pScript);
450 NCR_700_identify(int can_disconnect, __u8 lun)
452 return IDENTIFY_BASE |
453 ((can_disconnect) ? 0x40 : 0) |
454 (lun & NCR_700_LUN_MASK);
458 * Function : static int data_residual (Scsi_Host *host)
460 * Purpose : return residual data count of what's in the chip. If you
461 * really want to know what this function is doing, it's almost a
462 * direct transcription of the algorithm described in the 53c710
463 * guide, except that the DBC and DFIFO registers are only 6 bits
466 * Inputs : host - SCSI host */
468 NCR_700_data_residual (struct Scsi_Host *host) {
469 struct NCR_700_Host_Parameters *hostdata =
470 (struct NCR_700_Host_Parameters *)host->hostdata[0];
471 int count, synchronous = 0;
474 if(hostdata->chip710) {
475 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
476 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
478 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
479 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
483 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
485 /* get the data direction */
486 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
491 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
493 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
497 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
498 if (sstat & SODL_REG_FULL)
500 if (synchronous && (sstat & SODR_REG_FULL))
505 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
510 /* print out the SCSI wires and corresponding phase from the SBCL register
513 sbcl_to_string(__u8 sbcl)
516 static char ret[256];
521 strcat(ret, NCR_700_SBCL_bits[i]);
523 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
528 bitmap_to_number(__u8 bitmap)
532 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
537 /* Pull a slot off the free list */
538 STATIC struct NCR_700_command_slot *
539 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
541 struct NCR_700_command_slot *slot = hostdata->free_list;
545 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
546 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
550 if(slot->state != NCR_700_SLOT_FREE)
552 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
555 hostdata->free_list = slot->ITL_forw;
556 slot->ITL_forw = NULL;
559 /* NOTE: set the state to busy here, not queued, since this
560 * indicates the slot is in use and cannot be run by the IRQ
561 * finish routine. If we cannot queue the command when it
562 * is properly build, we then change to NCR_700_SLOT_QUEUED */
563 slot->state = NCR_700_SLOT_BUSY;
564 hostdata->command_slot_count++;
570 free_slot(struct NCR_700_command_slot *slot,
571 struct NCR_700_Host_Parameters *hostdata)
573 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
574 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
576 if(slot->state == NCR_700_SLOT_FREE) {
577 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
580 slot->resume_offset = 0;
582 slot->state = NCR_700_SLOT_FREE;
583 slot->ITL_forw = hostdata->free_list;
584 hostdata->free_list = slot;
585 hostdata->command_slot_count--;
589 /* This routine really does very little. The command is indexed on
590 the ITL and (if tagged) the ITLQ lists in _queuecommand */
592 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
593 struct scsi_cmnd *SCp, __u32 dsp)
595 /* Its just possible that this gets executed twice */
597 struct NCR_700_command_slot *slot =
598 (struct NCR_700_command_slot *)SCp->host_scribble;
600 slot->resume_offset = dsp;
602 hostdata->state = NCR_700_HOST_FREE;
603 hostdata->cmd = NULL;
607 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
608 struct NCR_700_command_slot *slot)
610 if(SCp->sc_data_direction != DMA_NONE &&
611 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
613 dma_unmap_sg(hostdata->dev, SCp->buffer,
614 SCp->use_sg, SCp->sc_data_direction);
616 dma_unmap_single(hostdata->dev, slot->dma_handle,
617 SCp->request_bufflen,
618 SCp->sc_data_direction);
624 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
625 struct scsi_cmnd *SCp, int result)
627 hostdata->state = NCR_700_HOST_FREE;
628 hostdata->cmd = NULL;
631 struct NCR_700_command_slot *slot =
632 (struct NCR_700_command_slot *)SCp->host_scribble;
634 NCR_700_unmap(hostdata, SCp, slot);
635 dma_unmap_single(hostdata->dev, slot->pCmd,
636 sizeof(SCp->cmnd), DMA_TO_DEVICE);
637 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
639 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
640 SCp, SCp->cmnd[7], result);
641 scsi_print_sense("53c700", SCp);
644 /* restore the old result if the request sense was
647 result = SCp->cmnd[7];
648 /* now restore the original command */
649 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
650 sizeof(SCp->data_cmnd));
651 SCp->request_buffer = SCp->buffer;
652 SCp->request_bufflen = SCp->bufflen;
653 SCp->use_sg = SCp->old_use_sg;
654 SCp->cmd_len = SCp->old_cmd_len;
655 SCp->sc_data_direction = SCp->sc_old_data_direction;
656 SCp->underflow = SCp->old_underflow;
659 free_slot(slot, hostdata);
661 if(NCR_700_get_depth(SCp->device) == 0 ||
662 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
663 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
664 NCR_700_get_depth(SCp->device));
665 #endif /* NCR_700_DEBUG */
666 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
668 SCp->host_scribble = NULL;
669 SCp->result = result;
672 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
678 NCR_700_internal_bus_reset(struct Scsi_Host *host)
681 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
683 NCR_700_writeb(0, host, SCNTL1_REG);
688 NCR_700_chip_setup(struct Scsi_Host *host)
690 struct NCR_700_Host_Parameters *hostdata =
691 (struct NCR_700_Host_Parameters *)host->hostdata[0];
692 __u32 dcntl_extra = 0;
694 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
696 if(hostdata->chip710) {
697 __u8 burst_disable = hostdata->burst_disable
699 dcntl_extra = COMPAT_700_MODE;
701 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
702 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
703 host, DMODE_710_REG);
704 NCR_700_writeb(burst_disable | (hostdata->differential ?
705 DIFF : 0), host, CTEST7_REG);
706 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
707 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
708 | AUTO_ATN, host, SCNTL0_REG);
710 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
711 host, DMODE_700_REG);
712 NCR_700_writeb(hostdata->differential ?
713 DIFF : 0, host, CTEST7_REG);
715 /* this is for 700-66, does nothing on 700 */
716 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
717 | GENERATE_RECEIVE_PARITY, host,
720 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
721 | PARITY | AUTO_ATN, host, SCNTL0_REG);
725 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
726 NCR_700_writeb(0, host, SBCL_REG);
727 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
729 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
730 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
732 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
733 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
734 if(hostdata->clock > 75) {
735 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
736 /* do the best we can, but the async clock will be out
737 * of spec: sync divider 2, async divider 3 */
738 DEBUG(("53c700: sync 2 async 3\n"));
739 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
740 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
741 hostdata->sync_clock = hostdata->clock/2;
742 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
743 /* sync divider 1.5, async divider 3 */
744 DEBUG(("53c700: sync 1.5 async 3\n"));
745 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
746 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
747 hostdata->sync_clock = hostdata->clock*2;
748 hostdata->sync_clock /= 3;
750 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
751 /* sync divider 1, async divider 2 */
752 DEBUG(("53c700: sync 1 async 2\n"));
753 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
754 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
755 hostdata->sync_clock = hostdata->clock;
756 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
757 /* sync divider 1, async divider 1.5 */
758 DEBUG(("53c700: sync 1 async 1.5\n"));
759 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
760 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
761 hostdata->sync_clock = hostdata->clock;
763 DEBUG(("53c700: sync 1 async 1\n"));
764 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
765 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
766 /* sync divider 1, async divider 1 */
767 hostdata->sync_clock = hostdata->clock;
769 /* Calculate the actual minimum period that can be supported
770 * by our synchronous clock speed. See the 710 manual for
771 * exact details of this calculation which is based on a
772 * setting of the SXFER register */
773 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
774 hostdata->min_period = NCR_700_MIN_PERIOD;
775 if(min_period > NCR_700_MIN_PERIOD)
776 hostdata->min_period = min_period;
780 NCR_700_chip_reset(struct Scsi_Host *host)
782 struct NCR_700_Host_Parameters *hostdata =
783 (struct NCR_700_Host_Parameters *)host->hostdata[0];
784 if(hostdata->chip710) {
785 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
788 NCR_700_writeb(0, host, ISTAT_REG);
790 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
793 NCR_700_writeb(0, host, DCNTL_REG);
798 NCR_700_chip_setup(host);
801 /* The heart of the message processing engine is that the instruction
802 * immediately after the INT is the normal case (and so must be CLEAR
803 * ACK). If we want to do something else, we call that routine in
804 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
805 * ACK) so that the routine returns correctly to resume its activity
808 process_extended_message(struct Scsi_Host *host,
809 struct NCR_700_Host_Parameters *hostdata,
810 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
812 __u32 resume_offset = dsp, temp = dsp + 8;
813 __u8 pun = 0xff, lun = 0xff;
816 pun = SCp->device->id;
817 lun = SCp->device->lun;
820 switch(hostdata->msgin[2]) {
822 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
823 __u8 period = hostdata->msgin[3];
824 __u8 offset = hostdata->msgin[4];
826 if(offset == 0 || period == 0) {
831 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
832 if(spi_offset(SCp->device->sdev_target) != 0)
833 printk(KERN_INFO "scsi%d: (%d:%d) Synchronous at offset %d, period %dns\n",
834 host->host_no, pun, lun,
837 printk(KERN_INFO "scsi%d: (%d:%d) Asynchronous\n",
838 host->host_no, pun, lun);
839 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
842 spi_offset(SCp->device->sdev_target) = offset;
843 spi_period(SCp->device->sdev_target) = period;
846 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
847 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
849 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
853 /* SDTR message out of the blue, reject it */
854 printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
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;
866 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
867 host->host_no, pun, lun);
868 hostdata->msgout[0] = A_REJECT_MSG;
869 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
870 script_patch_16(hostdata->script, MessageCount, 1);
871 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
876 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
877 host->host_no, pun, lun,
878 NCR_700_phase[(dsps & 0xf00) >> 8]);
879 scsi_print_msg(hostdata->msgin);
882 hostdata->msgout[0] = A_REJECT_MSG;
883 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
884 script_patch_16(hostdata->script, MessageCount, 1);
885 /* SendMsgOut returns, so set up the return
887 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
889 NCR_700_writel(temp, host, TEMP_REG);
890 return resume_offset;
894 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
895 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
897 /* work out where to return to */
898 __u32 temp = dsp + 8, resume_offset = dsp;
899 __u8 pun = 0xff, lun = 0xff;
902 pun = SCp->device->id;
903 lun = SCp->device->lun;
907 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
908 NCR_700_phase[(dsps & 0xf00) >> 8]);
909 scsi_print_msg(hostdata->msgin);
913 switch(hostdata->msgin[0]) {
916 resume_offset = process_extended_message(host, hostdata, SCp,
921 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
922 /* Rejected our sync negotiation attempt */
923 spi_period(SCp->device->sdev_target) =
924 spi_offset(SCp->device->sdev_target) = 0;
925 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
926 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
927 } else if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING)) {
928 /* rejected our first simple tag message */
929 printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
930 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
931 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
932 SCp->device->tagged_supported = 0;
933 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
935 printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
936 host->host_no, pun, lun,
937 NCR_700_phase[(dsps & 0xf00) >> 8]);
938 /* however, just ignore it */
942 case A_PARITY_ERROR_MSG:
943 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
945 NCR_700_internal_bus_reset(host);
947 case A_SIMPLE_TAG_MSG:
948 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
949 pun, lun, hostdata->msgin[1],
950 NCR_700_phase[(dsps & 0xf00) >> 8]);
954 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
955 host->host_no, pun, lun,
956 NCR_700_phase[(dsps & 0xf00) >> 8]);
958 scsi_print_msg(hostdata->msgin);
961 hostdata->msgout[0] = A_REJECT_MSG;
962 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
963 script_patch_16(hostdata->script, MessageCount, 1);
964 /* SendMsgOut returns, so set up the return
966 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
970 NCR_700_writel(temp, host, TEMP_REG);
971 /* set us up to receive another message */
972 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
973 return resume_offset;
977 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
978 struct Scsi_Host *host,
979 struct NCR_700_Host_Parameters *hostdata)
981 __u32 resume_offset = 0;
982 __u8 pun = 0xff, lun=0xff;
985 pun = SCp->device->id;
986 lun = SCp->device->lun;
989 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
990 DEBUG((" COMMAND COMPLETE, status=%02x\n",
991 hostdata->status[0]));
992 /* OK, if TCQ still on, we know it works */
993 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
994 /* check for contingent allegiance contitions */
995 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
996 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
997 struct NCR_700_command_slot *slot =
998 (struct NCR_700_command_slot *)SCp->host_scribble;
999 if(SCp->cmnd[0] == REQUEST_SENSE) {
1000 /* OOPS: bad device, returning another
1001 * contingent allegiance condition */
1002 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
1003 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1006 scsi_print_command(SCp);
1007 printk(" cmd %p has status %d, requesting sense\n",
1008 SCp, hostdata->status[0]);
1010 /* we can destroy the command here
1011 * because the contingent allegiance
1012 * condition will cause a retry which
1013 * will re-copy the command from the
1014 * saved data_cmnd. We also unmap any
1015 * data associated with the command
1017 NCR_700_unmap(hostdata, SCp, slot);
1019 SCp->cmnd[0] = REQUEST_SENSE;
1020 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1023 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1026 /* Here's a quiet hack: the
1027 * REQUEST_SENSE command is six bytes,
1028 * so store a flag indicating that
1029 * this was an internal sense request
1030 * and the original status at the end
1032 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1033 SCp->cmnd[7] = hostdata->status[0];
1035 SCp->sc_data_direction = DMA_FROM_DEVICE;
1036 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1037 SCp->cmd_len, DMA_TO_DEVICE);
1038 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1039 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1040 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1041 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1042 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1043 slot->SG[1].pAddr = 0;
1044 slot->resume_offset = hostdata->pScript;
1045 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1046 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1048 /* queue the command for reissue */
1049 slot->state = NCR_700_SLOT_QUEUED;
1050 hostdata->state = NCR_700_HOST_FREE;
1051 hostdata->cmd = NULL;
1054 // Currently rely on the mid layer evaluation
1055 // of the tag queuing capability
1057 //if(status_byte(hostdata->status[0]) == GOOD &&
1058 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1059 // /* Piggy back the tag queueing support
1060 // * on this command */
1061 // dma_sync_single_for_cpu(hostdata->dev,
1062 // slot->dma_handle,
1063 // SCp->request_bufflen,
1064 // DMA_FROM_DEVICE);
1065 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1066 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1067 // hostdata->tag_negotiated |= (1<<SCp->device->id);
1068 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1070 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1071 // hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1074 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1076 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1077 __u8 i = (dsps & 0xf00) >> 8;
1079 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1080 host->host_no, pun, lun,
1082 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1083 printk(KERN_ERR " len = %d, cmd =", SCp->cmd_len);
1084 scsi_print_command(SCp);
1086 NCR_700_internal_bus_reset(host);
1087 } else if((dsps & 0xfffff000) == A_FATAL) {
1088 int i = (dsps & 0xfff);
1090 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1091 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1092 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1093 printk(KERN_ERR " msg begins %02x %02x\n",
1094 hostdata->msgin[0], hostdata->msgin[1]);
1096 NCR_700_internal_bus_reset(host);
1097 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1098 #ifdef NCR_700_DEBUG
1099 __u8 i = (dsps & 0xf00) >> 8;
1101 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1102 host->host_no, pun, lun,
1103 i, NCR_700_phase[i]);
1105 save_for_reselection(hostdata, SCp, dsp);
1107 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1109 struct NCR_700_command_slot *slot;
1110 __u8 reselection_id = hostdata->reselection_id;
1111 struct scsi_device *SDp;
1113 lun = hostdata->msgin[0] & 0x1f;
1115 hostdata->reselection_id = 0xff;
1116 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1117 host->host_no, reselection_id, lun));
1118 /* clear the reselection indicator */
1119 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1120 if(unlikely(SDp == NULL)) {
1121 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1122 host->host_no, reselection_id, lun);
1125 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1126 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1127 if(unlikely(SCp == NULL)) {
1128 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1129 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1133 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1134 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1135 host->host_no, SDp->id, SDp->lun,
1136 hostdata->msgin[2], slot, slot->tag));
1138 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1139 if(unlikely(SCp == NULL)) {
1140 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n",
1141 host->host_no, reselection_id, lun);
1144 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1148 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1149 host->host_no, reselection_id, lun,
1150 hostdata->msgin[0], hostdata->msgin[1],
1151 hostdata->msgin[2]);
1153 if(hostdata->state != NCR_700_HOST_BUSY)
1154 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1156 resume_offset = slot->resume_offset;
1157 hostdata->cmd = slot->cmnd;
1159 /* re-patch for this command */
1160 script_patch_32_abs(hostdata->script, CommandAddress,
1162 script_patch_16(hostdata->script,
1163 CommandCount, slot->cmnd->cmd_len);
1164 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1165 to32bit(&slot->pSG[0].ins));
1167 /* Note: setting SXFER only works if we're
1168 * still in the MESSAGE phase, so it is vital
1169 * that ACK is still asserted when we process
1170 * the reselection message. The resume offset
1171 * should therefore always clear ACK */
1172 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1174 dma_cache_sync(hostdata->msgin,
1175 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1176 dma_cache_sync(hostdata->msgout,
1177 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1178 /* I'm just being paranoid here, the command should
1179 * already have been flushed from the cache */
1180 dma_cache_sync(slot->cmnd->cmnd,
1181 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1186 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1188 /* This section is full of debugging code because I've
1189 * never managed to reach it. I think what happens is
1190 * that, because the 700 runs with selection
1191 * interrupts enabled the whole time that we take a
1192 * selection interrupt before we manage to get to the
1193 * reselected script interrupt */
1195 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1196 struct NCR_700_command_slot *slot;
1198 /* Take out our own ID */
1199 reselection_id &= ~(1<<host->this_id);
1201 /* I've never seen this happen, so keep this as a printk rather
1203 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1204 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1207 /* FIXME: DEBUGGING CODE */
1208 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1211 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1212 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1213 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1216 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);
1217 SCp = hostdata->slots[i].cmnd;
1221 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1222 /* change slot from busy to queued to redo command */
1223 slot->state = NCR_700_SLOT_QUEUED;
1225 hostdata->cmd = NULL;
1227 if(reselection_id == 0) {
1228 if(hostdata->reselection_id == 0xff) {
1229 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1232 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1234 reselection_id = hostdata->reselection_id;
1238 /* convert to real ID */
1239 reselection_id = bitmap_to_number(reselection_id);
1241 hostdata->reselection_id = reselection_id;
1242 /* just in case we have a stale simple tag message, clear it */
1243 hostdata->msgin[1] = 0;
1244 dma_cache_sync(hostdata->msgin,
1245 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1246 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1247 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1249 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1251 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1252 /* we've just disconnected from the bus, do nothing since
1253 * a return here will re-run the queued command slot
1254 * that may have been interrupted by the initial selection */
1255 DEBUG((" SELECTION COMPLETED\n"));
1256 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1257 resume_offset = process_message(host, hostdata, SCp,
1259 } else if((dsps & 0xfffff000) == 0) {
1260 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1261 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1262 host->host_no, pun, lun, NCR_700_condition[i],
1263 NCR_700_phase[j], dsp - hostdata->pScript);
1265 scsi_print_command(SCp);
1268 for(i = 0; i < SCp->use_sg + 1; i++) {
1269 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);
1273 NCR_700_internal_bus_reset(host);
1274 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1275 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1276 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1277 resume_offset = dsp;
1279 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1280 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1281 NCR_700_internal_bus_reset(host);
1283 return resume_offset;
1286 /* We run the 53c700 with selection interrupts always enabled. This
1287 * means that the chip may be selected as soon as the bus frees. On a
1288 * busy bus, this can be before the scripts engine finishes its
1289 * processing. Therefore, part of the selection processing has to be
1290 * to find out what the scripts engine is doing and complete the
1291 * function if necessary (i.e. process the pending disconnect or save
1292 * the interrupted initial selection */
1294 process_selection(struct Scsi_Host *host, __u32 dsp)
1296 __u8 id = 0; /* Squash compiler warning */
1298 __u32 resume_offset = 0;
1299 struct NCR_700_Host_Parameters *hostdata =
1300 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1301 struct scsi_cmnd *SCp = hostdata->cmd;
1304 for(count = 0; count < 5; count++) {
1305 id = NCR_700_readb(host, hostdata->chip710 ?
1306 CTEST9_REG : SFBR_REG);
1308 /* Take out our own ID */
1309 id &= ~(1<<host->this_id);
1314 sbcl = NCR_700_readb(host, SBCL_REG);
1315 if((sbcl & SBCL_IO) == 0) {
1316 /* mark as having been selected rather than reselected */
1319 /* convert to real ID */
1320 hostdata->reselection_id = id = bitmap_to_number(id);
1321 DEBUG(("scsi%d: Reselected by %d\n",
1322 host->host_no, id));
1324 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1325 struct NCR_700_command_slot *slot =
1326 (struct NCR_700_command_slot *)SCp->host_scribble;
1327 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));
1329 switch(dsp - hostdata->pScript) {
1330 case Ent_Disconnect1:
1331 case Ent_Disconnect2:
1332 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1334 case Ent_Disconnect3:
1335 case Ent_Disconnect4:
1336 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1338 case Ent_Disconnect5:
1339 case Ent_Disconnect6:
1340 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1342 case Ent_Disconnect7:
1343 case Ent_Disconnect8:
1344 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1348 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1352 slot->state = NCR_700_SLOT_QUEUED;
1356 hostdata->state = NCR_700_HOST_BUSY;
1357 hostdata->cmd = NULL;
1358 /* clear any stale simple tag message */
1359 hostdata->msgin[1] = 0;
1360 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1364 /* Selected as target, Ignore */
1365 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1366 } else if(hostdata->tag_negotiated & (1<<id)) {
1367 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1369 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1371 return resume_offset;
1375 NCR_700_clear_fifo(struct Scsi_Host *host) {
1376 const struct NCR_700_Host_Parameters *hostdata
1377 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1378 if(hostdata->chip710) {
1379 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1381 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1386 NCR_700_flush_fifo(struct Scsi_Host *host) {
1387 const struct NCR_700_Host_Parameters *hostdata
1388 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1389 if(hostdata->chip710) {
1390 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1392 NCR_700_writeb(0, host, CTEST8_REG);
1394 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1396 NCR_700_writeb(0, host, DFIFO_REG);
1401 /* The queue lock with interrupts disabled must be held on entry to
1404 NCR_700_start_command(struct scsi_cmnd *SCp)
1406 struct NCR_700_command_slot *slot =
1407 (struct NCR_700_command_slot *)SCp->host_scribble;
1408 struct NCR_700_Host_Parameters *hostdata =
1409 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1410 __u16 count = 1; /* for IDENTIFY message */
1412 if(hostdata->state != NCR_700_HOST_FREE) {
1413 /* keep this inside the lock to close the race window where
1414 * the running command finishes on another CPU while we don't
1415 * change the state to queued on this one */
1416 slot->state = NCR_700_SLOT_QUEUED;
1418 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1419 SCp->device->host->host_no, slot->cmnd, slot));
1422 hostdata->state = NCR_700_HOST_BUSY;
1423 hostdata->cmd = SCp;
1424 slot->state = NCR_700_SLOT_BUSY;
1425 /* keep interrupts disabled until we have the command correctly
1426 * set up so we cannot take a selection interrupt */
1428 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1430 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1431 * if the negotiated transfer parameters still hold, so
1432 * always renegotiate them */
1433 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1434 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1437 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1438 * If a contingent allegiance condition exists, the device
1439 * will refuse all tags, so send the request sense as untagged
1441 if((hostdata->tag_negotiated & (1<<SCp->device->id))
1442 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1443 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1446 if(hostdata->fast &&
1447 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1448 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1449 sizeof(NCR_700_SDTR_msg));
1450 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
1451 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
1452 count += sizeof(NCR_700_SDTR_msg);
1453 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1456 script_patch_16(hostdata->script, MessageCount, count);
1459 script_patch_ID(hostdata->script,
1460 Device_ID, 1<<SCp->device->id);
1462 script_patch_32_abs(hostdata->script, CommandAddress,
1464 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1465 /* finally plumb the beginning of the SG list into the script
1467 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1468 to32bit(&slot->pSG[0].ins));
1469 NCR_700_clear_fifo(SCp->device->host);
1471 if(slot->resume_offset == 0)
1472 slot->resume_offset = hostdata->pScript;
1473 /* now perform all the writebacks and invalidates */
1474 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1475 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1477 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1478 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1480 /* set the synchronous period/offset */
1481 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1482 SCp->device->host, SXFER_REG);
1483 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1484 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1490 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1492 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1493 struct NCR_700_Host_Parameters *hostdata =
1494 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1496 __u32 resume_offset = 0;
1497 __u8 pun = 0xff, lun = 0xff;
1498 unsigned long flags;
1501 /* Use the host lock to serialise acess to the 53c700
1502 * hardware. Note: In future, we may need to take the queue
1503 * lock to enter the done routines. When that happens, we
1504 * need to ensure that for this driver, the host lock and the
1505 * queue lock point to the same thing. */
1506 spin_lock_irqsave(host->host_lock, flags);
1507 if((istat = NCR_700_readb(host, ISTAT_REG))
1508 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1510 __u8 sstat0 = 0, dstat = 0;
1512 struct scsi_cmnd *SCp = hostdata->cmd;
1513 enum NCR_700_Host_State state;
1516 state = hostdata->state;
1517 SCp = hostdata->cmd;
1519 if(istat & SCSI_INT_PENDING) {
1522 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1525 if(istat & DMA_INT_PENDING) {
1528 dstat = NCR_700_readb(host, DSTAT_REG);
1531 dsps = NCR_700_readl(host, DSPS_REG);
1532 dsp = NCR_700_readl(host, DSP_REG);
1534 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1535 host->host_no, istat, sstat0, dstat,
1536 (dsp - (__u32)(hostdata->pScript))/4,
1540 pun = SCp->device->id;
1541 lun = SCp->device->lun;
1544 if(sstat0 & SCSI_RESET_DETECTED) {
1545 struct scsi_device *SDp;
1548 hostdata->state = NCR_700_HOST_BUSY;
1550 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1551 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1553 scsi_report_bus_reset(host, 0);
1555 /* clear all the negotiated parameters */
1556 __shost_for_each_device(SDp, host)
1557 SDp->hostdata = NULL;
1559 /* clear all the slots and their pending commands */
1560 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1561 struct scsi_cmnd *SCp;
1562 struct NCR_700_command_slot *slot =
1563 &hostdata->slots[i];
1565 if(slot->state == NCR_700_SLOT_FREE)
1569 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1571 free_slot(slot, hostdata);
1572 SCp->host_scribble = NULL;
1573 NCR_700_set_depth(SCp->device, 0);
1574 /* NOTE: deadlock potential here: we
1575 * rely on mid-layer guarantees that
1576 * scsi_done won't try to issue the
1577 * command again otherwise we'll
1579 * hostdata->state_lock */
1580 SCp->result = DID_RESET << 16;
1581 SCp->scsi_done(SCp);
1584 NCR_700_chip_setup(host);
1586 hostdata->state = NCR_700_HOST_FREE;
1587 hostdata->cmd = NULL;
1588 /* signal back if this was an eh induced reset */
1589 if(hostdata->eh_complete != NULL)
1590 complete(hostdata->eh_complete);
1592 } else if(sstat0 & SELECTION_TIMEOUT) {
1593 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1594 host->host_no, pun, lun));
1595 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1596 } else if(sstat0 & PHASE_MISMATCH) {
1597 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1598 (struct NCR_700_command_slot *)SCp->host_scribble;
1600 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1601 /* It wants to reply to some part of
1603 #ifdef NCR_700_DEBUG
1604 __u32 temp = NCR_700_readl(host, TEMP_REG);
1605 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1606 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)));
1608 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1609 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1610 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1611 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1612 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1613 int residual = NCR_700_data_residual(host);
1615 #ifdef NCR_700_DEBUG
1616 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1618 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1619 host->host_no, pun, lun,
1620 SGcount, data_transfer);
1621 scsi_print_command(SCp);
1623 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1624 host->host_no, pun, lun,
1625 SGcount, data_transfer, residual);
1628 data_transfer += residual;
1630 if(data_transfer != 0) {
1636 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1637 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1638 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1639 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1640 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1641 pAddr += (count - data_transfer);
1642 #ifdef NCR_700_DEBUG
1643 if(pAddr != naddr) {
1644 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);
1647 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1649 /* set the executed moves to nops */
1650 for(i=0; i<SGcount; i++) {
1651 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1652 slot->SG[i].pAddr = 0;
1654 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1655 /* and pretend we disconnected after
1656 * the command phase */
1657 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1658 /* make sure all the data is flushed */
1659 NCR_700_flush_fifo(host);
1661 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1662 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1663 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1664 NCR_700_internal_bus_reset(host);
1667 } else if(sstat0 & SCSI_GROSS_ERROR) {
1668 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1669 host->host_no, pun, lun);
1670 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1671 } else if(sstat0 & PARITY_ERROR) {
1672 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1673 host->host_no, pun, lun);
1674 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1675 } else if(dstat & SCRIPT_INT_RECEIVED) {
1676 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1677 host->host_no, pun, lun));
1678 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1679 } else if(dstat & (ILGL_INST_DETECTED)) {
1680 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1681 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1682 host->host_no, pun, lun,
1683 dsp, dsp - hostdata->pScript);
1684 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1685 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1686 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1687 host->host_no, pun, lun, dstat);
1688 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1692 /* NOTE: selection interrupt processing MUST occur
1693 * after script interrupt processing to correctly cope
1694 * with the case where we process a disconnect and
1695 * then get reselected before we process the
1697 if(sstat0 & SELECTED) {
1698 /* FIXME: It currently takes at least FOUR
1699 * interrupts to complete a command that
1700 * disconnects: one for the disconnect, one
1701 * for the reselection, one to get the
1702 * reselection data and one to complete the
1703 * command. If we guess the reselected
1704 * command here and prepare it, we only need
1705 * to get a reselection data interrupt if we
1706 * guessed wrongly. Since the interrupt
1707 * overhead is much greater than the command
1708 * setup, this would be an efficient
1709 * optimisation particularly as we probably
1710 * only have one outstanding command on a
1711 * target most of the time */
1713 resume_offset = process_selection(host, dsp);
1720 if(hostdata->state != NCR_700_HOST_BUSY) {
1721 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1722 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1723 hostdata->state = NCR_700_HOST_BUSY;
1726 DEBUG(("Attempting to resume at %x\n", resume_offset));
1727 NCR_700_clear_fifo(host);
1728 NCR_700_writel(resume_offset, host, DSP_REG);
1730 /* There is probably a technical no-no about this: If we're a
1731 * shared interrupt and we got this interrupt because the
1732 * other device needs servicing not us, we're still going to
1733 * check our queued commands here---of course, there shouldn't
1734 * be any outstanding.... */
1735 if(hostdata->state == NCR_700_HOST_FREE) {
1738 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1739 /* fairness: always run the queue from the last
1740 * position we left off */
1741 int j = (i + hostdata->saved_slot_position)
1742 % NCR_700_COMMAND_SLOTS_PER_HOST;
1744 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1746 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1747 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1748 host->host_no, &hostdata->slots[j],
1749 hostdata->slots[j].cmnd));
1750 hostdata->saved_slot_position = j + 1;
1757 spin_unlock_irqrestore(host->host_lock, flags);
1758 return IRQ_RETVAL(handled);
1762 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1764 struct NCR_700_Host_Parameters *hostdata =
1765 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1767 enum dma_data_direction direction;
1768 struct NCR_700_command_slot *slot;
1770 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1771 /* We're over our allocation, this should never happen
1772 * since we report the max allocation to the mid layer */
1773 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1776 /* check for untagged commands. We cannot have any outstanding
1777 * commands if we accept them. Commands could be untagged because:
1779 * - The tag negotiated bitmap is clear
1780 * - The blk layer sent and untagged command
1782 if(NCR_700_get_depth(SCp->device) != 0
1783 && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
1784 || !blk_rq_tagged(SCp->request))) {
1785 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
1786 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1787 NCR_700_get_depth(SCp->device)));
1788 return SCSI_MLQUEUE_DEVICE_BUSY;
1790 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1791 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
1792 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1793 NCR_700_get_depth(SCp->device)));
1794 return SCSI_MLQUEUE_DEVICE_BUSY;
1796 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1798 /* begin the command here */
1799 /* no need to check for NULL, test for command_slot_count above
1800 * ensures a slot is free */
1801 slot = find_empty_slot(hostdata);
1805 SCp->scsi_done = done;
1806 SCp->host_scribble = (unsigned char *)slot;
1807 SCp->SCp.ptr = NULL;
1808 SCp->SCp.buffer = NULL;
1810 #ifdef NCR_700_DEBUG
1811 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1812 scsi_print_command(SCp);
1814 if(SCp->device->tagged_supported && !SCp->device->simple_tags
1815 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0
1816 && NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING)) {
1817 /* upper layer has indicated tags are supported. We don't
1818 * necessarily believe it yet.
1820 * NOTE: There is a danger here: the mid layer supports
1821 * tag queuing per LUN. We only support it per PUN because
1822 * of potential reselection issues */
1823 scsi_activate_tcq(SCp->device, NCR_700_DEFAULT_TAGS);
1826 if(blk_rq_tagged(SCp->request)
1827 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0) {
1828 printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1829 hostdata->tag_negotiated |= (1<<SCp->device->id);
1830 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1833 /* here we may have to process an untagged command. The gate
1834 * above ensures that this will be the only one outstanding,
1835 * so clear the tag negotiated bit.
1837 * FIXME: This will royally screw up on multiple LUN devices
1839 if(!blk_rq_tagged(SCp->request)
1840 && (hostdata->tag_negotiated &(1<<SCp->device->id))) {
1841 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1842 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1845 if((hostdata->tag_negotiated &(1<<SCp->device->id))) {
1846 slot->tag = SCp->request->tag;
1847 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1848 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
1851 slot->tag = SCSI_NO_TAG;
1852 /* must populate current_cmnd for scsi_find_tag to work */
1853 SCp->device->current_cmnd = SCp;
1855 /* sanity check: some of the commands generated by the mid-layer
1856 * have an eccentric idea of their sc_data_direction */
1857 if(!SCp->use_sg && !SCp->request_bufflen
1858 && SCp->sc_data_direction != DMA_NONE) {
1859 #ifdef NCR_700_DEBUG
1860 printk("53c700: Command");
1861 scsi_print_command(SCp);
1862 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1864 SCp->sc_data_direction = DMA_NONE;
1867 switch (SCp->cmnd[0]) {
1869 /* clear the internal sense magic */
1873 /* OK, get it from the command */
1874 switch(SCp->sc_data_direction) {
1875 case DMA_BIDIRECTIONAL:
1877 printk(KERN_ERR "53c700: Unknown command for data direction ");
1878 scsi_print_command(SCp);
1885 case DMA_FROM_DEVICE:
1886 move_ins = SCRIPT_MOVE_DATA_IN;
1889 move_ins = SCRIPT_MOVE_DATA_OUT;
1894 /* now build the scatter gather list */
1895 direction = SCp->sc_data_direction;
1899 dma_addr_t vPtr = 0;
1903 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1904 SCp->use_sg, direction);
1906 vPtr = dma_map_single(hostdata->dev,
1907 SCp->request_buffer,
1908 SCp->request_bufflen,
1910 count = SCp->request_bufflen;
1911 slot->dma_handle = vPtr;
1916 for(i = 0; i < sg_count; i++) {
1919 struct scatterlist *sg = SCp->buffer;
1921 vPtr = sg_dma_address(&sg[i]);
1922 count = sg_dma_len(&sg[i]);
1925 slot->SG[i].ins = bS_to_host(move_ins | count);
1926 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1927 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1928 slot->SG[i].pAddr = bS_to_host(vPtr);
1930 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1931 slot->SG[i].pAddr = 0;
1932 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1933 DEBUG((" SETTING %08lx to %x\n",
1934 (&slot->pSG[i].ins),
1937 slot->resume_offset = 0;
1938 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1939 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1940 NCR_700_start_command(SCp);
1945 NCR_700_abort(struct scsi_cmnd * SCp)
1947 struct NCR_700_command_slot *slot;
1949 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
1950 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1951 scsi_print_command(SCp);
1953 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1956 /* no outstanding command to abort */
1958 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1959 /* FIXME: This is because of a problem in the new
1960 * error handler. When it is in error recovery, it
1961 * will send a TUR to a device it thinks may still be
1962 * showing a problem. If the TUR isn't responded to,
1963 * it will abort it and mark the device off line.
1964 * Unfortunately, it does no other error recovery, so
1965 * this would leave us with an outstanding command
1966 * occupying a slot. Rather than allow this to
1967 * happen, we issue a bus reset to force all
1968 * outstanding commands to terminate here. */
1969 NCR_700_internal_bus_reset(SCp->device->host);
1970 /* still drop through and return failed */
1977 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1979 DECLARE_COMPLETION(complete);
1980 struct NCR_700_Host_Parameters *hostdata =
1981 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1983 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1984 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
1985 scsi_print_command(SCp);
1986 /* In theory, eh_complete should always be null because the
1987 * eh is single threaded, but just in case we're handling a
1988 * reset via sg or something */
1989 while(hostdata->eh_complete != NULL) {
1990 spin_unlock_irq(SCp->device->host->host_lock);
1991 msleep_interruptible(100);
1992 spin_lock_irq(SCp->device->host->host_lock);
1994 hostdata->eh_complete = &complete;
1995 NCR_700_internal_bus_reset(SCp->device->host);
1996 spin_unlock_irq(SCp->device->host->host_lock);
1997 wait_for_completion(&complete);
1998 spin_lock_irq(SCp->device->host->host_lock);
1999 hostdata->eh_complete = NULL;
2000 /* Revalidate the transport parameters of the failing device */
2002 spi_schedule_dv_device(SCp->device);
2007 NCR_700_dev_reset(struct scsi_cmnd * SCp)
2009 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants device reset\n\t",
2010 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
2011 scsi_print_command(SCp);
2017 NCR_700_host_reset(struct scsi_cmnd * SCp)
2019 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
2020 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
2021 scsi_print_command(SCp);
2023 NCR_700_internal_bus_reset(SCp->device->host);
2024 NCR_700_chip_reset(SCp->device->host);
2029 NCR_700_set_period(struct scsi_target *STp, int period)
2031 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2032 struct NCR_700_Host_Parameters *hostdata =
2033 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2038 if(period < hostdata->min_period)
2039 period = hostdata->min_period;
2041 spi_period(STp) = period;
2042 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2043 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2044 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2048 NCR_700_set_offset(struct scsi_target *STp, int offset)
2050 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2051 struct NCR_700_Host_Parameters *hostdata =
2052 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2053 int max_offset = hostdata->chip710
2054 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2059 if(offset > max_offset)
2060 offset = max_offset;
2062 /* if we're currently async, make sure the period is reasonable */
2063 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2064 spi_period(STp) > 0xff))
2065 spi_period(STp) = hostdata->min_period;
2067 spi_offset(STp) = offset;
2068 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2069 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2070 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2076 NCR_700_slave_configure(struct scsi_device *SDp)
2078 struct NCR_700_Host_Parameters *hostdata =
2079 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2081 /* to do here: allocate memory; build a queue_full list */
2082 if(SDp->tagged_supported) {
2083 /* do TCQ stuff here */
2085 /* initialise to default depth */
2086 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2088 if(hostdata->fast) {
2089 /* Find the correct offset and period via domain validation */
2090 if (!spi_initial_dv(SDp->sdev_target))
2093 spi_offset(SDp->sdev_target) = 0;
2094 spi_period(SDp->sdev_target) = 0;
2100 NCR_700_slave_destroy(struct scsi_device *SDp)
2102 /* to do here: deallocate memory */
2106 NCR_700_store_queue_depth(struct device *dev, const char *buf, size_t count)
2110 struct scsi_device *SDp = to_scsi_device(dev);
2111 depth = simple_strtoul(buf, NULL, 0);
2112 if(depth > NCR_700_MAX_TAGS)
2114 scsi_adjust_queue_depth(SDp, MSG_ORDERED_TAG, depth);
2120 NCR_700_show_active_tags(struct device *dev, char *buf)
2122 struct scsi_device *SDp = to_scsi_device(dev);
2124 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2127 static struct device_attribute NCR_700_queue_depth_attr = {
2129 .name = "queue_depth",
2132 .store = NCR_700_store_queue_depth,
2135 static struct device_attribute NCR_700_active_tags_attr = {
2137 .name = "active_tags",
2140 .show = NCR_700_show_active_tags,
2143 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2144 &NCR_700_queue_depth_attr,
2145 &NCR_700_active_tags_attr,
2149 EXPORT_SYMBOL(NCR_700_detect);
2150 EXPORT_SYMBOL(NCR_700_release);
2151 EXPORT_SYMBOL(NCR_700_intr);
2153 static struct spi_function_template NCR_700_transport_functions = {
2154 .set_period = NCR_700_set_period,
2156 .set_offset = NCR_700_set_offset,
2160 static int __init NCR_700_init(void)
2162 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2163 if(!NCR_700_transport_template)
2168 static void __exit NCR_700_exit(void)
2170 spi_release_transport(NCR_700_transport_template);
2173 module_init(NCR_700_init);
2174 module_exit(NCR_700_exit);