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);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
186 static char *NCR_700_phase[] = {
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
197 static char *NCR_700_condition[] = {
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
212 static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
219 static char *NCR_700_SBCL_bits[] = {
230 static char *NCR_700_SBCL_to_phase[] = {
241 static __u8 NCR_700_SDTR_msg[] = {
242 0x01, /* Extended message */
243 0x03, /* Extended message Length */
244 0x01, /* SDTR Extended message */
249 /* This translates the SDTR message offset and period to a value
250 * which can be loaded into the SXFER_REG.
252 * NOTE: According to SCSI-2, the true transfer period (in ns) is
253 * actually four times this period value */
255 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
256 __u8 offset, __u8 period)
260 __u8 min_xferp = (hostdata->chip710
261 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
262 __u8 max_offset = (hostdata->chip710
263 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
268 if(period < hostdata->min_period) {
269 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);
270 period = hostdata->min_period;
272 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
273 if(offset > max_offset) {
274 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
278 if(XFERP < min_xferp) {
279 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
283 return (offset & 0x0f) | (XFERP & 0x07)<<4;
287 NCR_700_get_SXFER(struct scsi_device *SDp)
289 struct NCR_700_Host_Parameters *hostdata =
290 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
292 return NCR_700_offset_period_to_sxfer(hostdata,
293 spi_offset(SDp->sdev_target),
294 spi_period(SDp->sdev_target));
298 NCR_700_detect(struct scsi_host_template *tpnt,
299 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
301 dma_addr_t pScript, pSlots;
304 struct Scsi_Host *host;
305 static int banner = 0;
308 if(tpnt->sdev_attrs == NULL)
309 tpnt->sdev_attrs = NCR_700_dev_attrs;
311 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
312 &pScript, GFP_KERNEL);
314 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
318 script = (__u32 *)memory;
319 hostdata->msgin = memory + MSGIN_OFFSET;
320 hostdata->msgout = memory + MSGOUT_OFFSET;
321 hostdata->status = memory + STATUS_OFFSET;
322 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
323 * if this isn't sufficient separation to avoid dma flushing issues */
324 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
325 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
328 pSlots = pScript + SLOTS_OFFSET;
330 /* Fill in the missing routines from the host template */
331 tpnt->queuecommand = NCR_700_queuecommand;
332 tpnt->eh_abort_handler = NCR_700_abort;
333 tpnt->eh_device_reset_handler = NCR_700_dev_reset;
334 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
335 tpnt->eh_host_reset_handler = NCR_700_host_reset;
336 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
337 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
338 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
339 tpnt->use_clustering = ENABLE_CLUSTERING;
340 tpnt->slave_configure = NCR_700_slave_configure;
341 tpnt->slave_destroy = NCR_700_slave_destroy;
342 tpnt->change_queue_depth = NCR_700_change_queue_depth;
343 tpnt->change_queue_type = NCR_700_change_queue_type;
345 if(tpnt->name == NULL)
346 tpnt->name = "53c700";
347 if(tpnt->proc_name == NULL)
348 tpnt->proc_name = "53c700";
351 host = scsi_host_alloc(tpnt, 4);
354 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
355 * NCR_700_COMMAND_SLOTS_PER_HOST);
356 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
357 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
358 - (unsigned long)&hostdata->slots[0].SG[0]);
359 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
361 hostdata->free_list = &hostdata->slots[j];
363 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
364 hostdata->slots[j].state = NCR_700_SLOT_FREE;
367 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
368 script[j] = bS_to_host(SCRIPT[j]);
371 /* adjust all labels to be bus physical */
372 for(j = 0; j < PATCHES; j++) {
373 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
375 /* now patch up fixed addresses. */
376 script_patch_32(script, MessageLocation,
377 pScript + MSGOUT_OFFSET);
378 script_patch_32(script, StatusAddress,
379 pScript + STATUS_OFFSET);
380 script_patch_32(script, ReceiveMsgAddress,
381 pScript + MSGIN_OFFSET);
383 hostdata->script = script;
384 hostdata->pScript = pScript;
385 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
386 hostdata->state = NCR_700_HOST_FREE;
387 hostdata->cmd = NULL;
389 host->max_lun = NCR_700_MAX_LUNS;
390 BUG_ON(NCR_700_transport_template == NULL);
391 host->transportt = NCR_700_transport_template;
392 host->unique_id = hostdata->base;
393 host->base = hostdata->base;
394 hostdata->eh_complete = NULL;
395 host->hostdata[0] = (unsigned long)hostdata;
397 NCR_700_writeb(0xff, host, CTEST9_REG);
398 if(hostdata->chip710)
399 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
401 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
402 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
404 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
407 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
408 hostdata->chip710 ? "53c710" :
409 (hostdata->fast ? "53c700-66" : "53c700"),
410 hostdata->rev, hostdata->differential ?
411 "(Differential)" : "");
413 NCR_700_chip_reset(host);
415 if (scsi_add_host(host, dev)) {
416 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
421 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
428 NCR_700_release(struct Scsi_Host *host)
430 struct NCR_700_Host_Parameters *hostdata =
431 (struct NCR_700_Host_Parameters *)host->hostdata[0];
433 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
434 hostdata->script, hostdata->pScript);
439 NCR_700_identify(int can_disconnect, __u8 lun)
441 return IDENTIFY_BASE |
442 ((can_disconnect) ? 0x40 : 0) |
443 (lun & NCR_700_LUN_MASK);
447 * Function : static int data_residual (Scsi_Host *host)
449 * Purpose : return residual data count of what's in the chip. If you
450 * really want to know what this function is doing, it's almost a
451 * direct transcription of the algorithm described in the 53c710
452 * guide, except that the DBC and DFIFO registers are only 6 bits
455 * Inputs : host - SCSI host */
457 NCR_700_data_residual (struct Scsi_Host *host) {
458 struct NCR_700_Host_Parameters *hostdata =
459 (struct NCR_700_Host_Parameters *)host->hostdata[0];
460 int count, synchronous = 0;
463 if(hostdata->chip710) {
464 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
465 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
467 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
468 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
472 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
474 /* get the data direction */
475 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
480 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
482 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
486 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
487 if (sstat & SODL_REG_FULL)
489 if (synchronous && (sstat & SODR_REG_FULL))
494 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
499 /* print out the SCSI wires and corresponding phase from the SBCL register
502 sbcl_to_string(__u8 sbcl)
505 static char ret[256];
510 strcat(ret, NCR_700_SBCL_bits[i]);
512 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
517 bitmap_to_number(__u8 bitmap)
521 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
526 /* Pull a slot off the free list */
527 STATIC struct NCR_700_command_slot *
528 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
530 struct NCR_700_command_slot *slot = hostdata->free_list;
534 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
535 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
539 if(slot->state != NCR_700_SLOT_FREE)
541 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
544 hostdata->free_list = slot->ITL_forw;
545 slot->ITL_forw = NULL;
548 /* NOTE: set the state to busy here, not queued, since this
549 * indicates the slot is in use and cannot be run by the IRQ
550 * finish routine. If we cannot queue the command when it
551 * is properly build, we then change to NCR_700_SLOT_QUEUED */
552 slot->state = NCR_700_SLOT_BUSY;
553 hostdata->command_slot_count++;
559 free_slot(struct NCR_700_command_slot *slot,
560 struct NCR_700_Host_Parameters *hostdata)
562 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
563 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
565 if(slot->state == NCR_700_SLOT_FREE) {
566 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
569 slot->resume_offset = 0;
571 slot->state = NCR_700_SLOT_FREE;
572 slot->ITL_forw = hostdata->free_list;
573 hostdata->free_list = slot;
574 hostdata->command_slot_count--;
578 /* This routine really does very little. The command is indexed on
579 the ITL and (if tagged) the ITLQ lists in _queuecommand */
581 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
582 struct scsi_cmnd *SCp, __u32 dsp)
584 /* Its just possible that this gets executed twice */
586 struct NCR_700_command_slot *slot =
587 (struct NCR_700_command_slot *)SCp->host_scribble;
589 slot->resume_offset = dsp;
591 hostdata->state = NCR_700_HOST_FREE;
592 hostdata->cmd = NULL;
596 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
597 struct NCR_700_command_slot *slot)
599 if(SCp->sc_data_direction != DMA_NONE &&
600 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
602 dma_unmap_sg(hostdata->dev, SCp->buffer,
603 SCp->use_sg, SCp->sc_data_direction);
605 dma_unmap_single(hostdata->dev, slot->dma_handle,
606 SCp->request_bufflen,
607 SCp->sc_data_direction);
613 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
614 struct scsi_cmnd *SCp, int result)
616 hostdata->state = NCR_700_HOST_FREE;
617 hostdata->cmd = NULL;
620 struct NCR_700_command_slot *slot =
621 (struct NCR_700_command_slot *)SCp->host_scribble;
623 NCR_700_unmap(hostdata, SCp, slot);
624 dma_unmap_single(hostdata->dev, slot->pCmd,
625 sizeof(SCp->cmnd), DMA_TO_DEVICE);
626 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
628 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
629 SCp, SCp->cmnd[7], result);
630 scsi_print_sense("53c700", SCp);
633 /* restore the old result if the request sense was
636 result = SCp->cmnd[7];
637 /* now restore the original command */
638 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
639 sizeof(SCp->data_cmnd));
640 SCp->request_buffer = SCp->buffer;
641 SCp->request_bufflen = SCp->bufflen;
642 SCp->use_sg = SCp->old_use_sg;
643 SCp->cmd_len = SCp->old_cmd_len;
644 SCp->sc_data_direction = SCp->sc_old_data_direction;
645 SCp->underflow = SCp->old_underflow;
648 free_slot(slot, hostdata);
650 if(NCR_700_get_depth(SCp->device) == 0 ||
651 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
652 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
653 NCR_700_get_depth(SCp->device));
654 #endif /* NCR_700_DEBUG */
655 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
657 SCp->host_scribble = NULL;
658 SCp->result = result;
661 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
667 NCR_700_internal_bus_reset(struct Scsi_Host *host)
670 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
672 NCR_700_writeb(0, host, SCNTL1_REG);
677 NCR_700_chip_setup(struct Scsi_Host *host)
679 struct NCR_700_Host_Parameters *hostdata =
680 (struct NCR_700_Host_Parameters *)host->hostdata[0];
681 __u32 dcntl_extra = 0;
683 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
685 if(hostdata->chip710) {
686 __u8 burst_disable = hostdata->burst_disable
688 dcntl_extra = COMPAT_700_MODE;
690 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
691 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
692 host, DMODE_710_REG);
693 NCR_700_writeb(burst_disable | (hostdata->differential ?
694 DIFF : 0), host, CTEST7_REG);
695 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
696 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
697 | AUTO_ATN, host, SCNTL0_REG);
699 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
700 host, DMODE_700_REG);
701 NCR_700_writeb(hostdata->differential ?
702 DIFF : 0, host, CTEST7_REG);
704 /* this is for 700-66, does nothing on 700 */
705 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
706 | GENERATE_RECEIVE_PARITY, host,
709 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
710 | PARITY | AUTO_ATN, host, SCNTL0_REG);
714 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
715 NCR_700_writeb(0, host, SBCL_REG);
716 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
718 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
719 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
721 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
722 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
723 if(hostdata->clock > 75) {
724 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
725 /* do the best we can, but the async clock will be out
726 * of spec: sync divider 2, async divider 3 */
727 DEBUG(("53c700: sync 2 async 3\n"));
728 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
729 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
730 hostdata->sync_clock = hostdata->clock/2;
731 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
732 /* sync divider 1.5, async divider 3 */
733 DEBUG(("53c700: sync 1.5 async 3\n"));
734 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
735 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
736 hostdata->sync_clock = hostdata->clock*2;
737 hostdata->sync_clock /= 3;
739 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
740 /* sync divider 1, async divider 2 */
741 DEBUG(("53c700: sync 1 async 2\n"));
742 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
743 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
744 hostdata->sync_clock = hostdata->clock;
745 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
746 /* sync divider 1, async divider 1.5 */
747 DEBUG(("53c700: sync 1 async 1.5\n"));
748 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
749 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
750 hostdata->sync_clock = hostdata->clock;
752 DEBUG(("53c700: sync 1 async 1\n"));
753 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
754 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
755 /* sync divider 1, async divider 1 */
756 hostdata->sync_clock = hostdata->clock;
758 /* Calculate the actual minimum period that can be supported
759 * by our synchronous clock speed. See the 710 manual for
760 * exact details of this calculation which is based on a
761 * setting of the SXFER register */
762 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
763 hostdata->min_period = NCR_700_MIN_PERIOD;
764 if(min_period > NCR_700_MIN_PERIOD)
765 hostdata->min_period = min_period;
769 NCR_700_chip_reset(struct Scsi_Host *host)
771 struct NCR_700_Host_Parameters *hostdata =
772 (struct NCR_700_Host_Parameters *)host->hostdata[0];
773 if(hostdata->chip710) {
774 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
777 NCR_700_writeb(0, host, ISTAT_REG);
779 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
782 NCR_700_writeb(0, host, DCNTL_REG);
787 NCR_700_chip_setup(host);
790 /* The heart of the message processing engine is that the instruction
791 * immediately after the INT is the normal case (and so must be CLEAR
792 * ACK). If we want to do something else, we call that routine in
793 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
794 * ACK) so that the routine returns correctly to resume its activity
797 process_extended_message(struct Scsi_Host *host,
798 struct NCR_700_Host_Parameters *hostdata,
799 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
801 __u32 resume_offset = dsp, temp = dsp + 8;
802 __u8 pun = 0xff, lun = 0xff;
805 pun = SCp->device->id;
806 lun = SCp->device->lun;
809 switch(hostdata->msgin[2]) {
811 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
812 struct scsi_target *starget = SCp->device->sdev_target;
813 __u8 period = hostdata->msgin[3];
814 __u8 offset = hostdata->msgin[4];
816 if(offset == 0 || period == 0) {
821 spi_offset(starget) = offset;
822 spi_period(starget) = period;
824 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
825 spi_display_xfer_agreement(starget);
826 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
829 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
830 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
832 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
836 /* SDTR message out of the blue, reject it */
837 printk(KERN_WARNING "scsi%d Unexpected SDTR msg\n",
839 hostdata->msgout[0] = A_REJECT_MSG;
840 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
841 script_patch_16(hostdata->script, MessageCount, 1);
842 /* SendMsgOut returns, so set up the return
844 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
849 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
850 host->host_no, pun, lun);
851 hostdata->msgout[0] = A_REJECT_MSG;
852 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
853 script_patch_16(hostdata->script, MessageCount, 1);
854 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
859 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
860 host->host_no, pun, lun,
861 NCR_700_phase[(dsps & 0xf00) >> 8]);
862 scsi_print_msg(hostdata->msgin);
865 hostdata->msgout[0] = A_REJECT_MSG;
866 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
867 script_patch_16(hostdata->script, MessageCount, 1);
868 /* SendMsgOut returns, so set up the return
870 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
872 NCR_700_writel(temp, host, TEMP_REG);
873 return resume_offset;
877 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
878 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
880 /* work out where to return to */
881 __u32 temp = dsp + 8, resume_offset = dsp;
882 __u8 pun = 0xff, lun = 0xff;
885 pun = SCp->device->id;
886 lun = SCp->device->lun;
890 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
891 NCR_700_phase[(dsps & 0xf00) >> 8]);
892 scsi_print_msg(hostdata->msgin);
896 switch(hostdata->msgin[0]) {
899 resume_offset = process_extended_message(host, hostdata, SCp,
904 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
905 /* Rejected our sync negotiation attempt */
906 spi_period(SCp->device->sdev_target) =
907 spi_offset(SCp->device->sdev_target) = 0;
908 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
909 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
910 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
911 /* rejected our first simple tag message */
912 printk(KERN_WARNING "scsi%d (%d:%d) Rejected first tag queue attempt, turning off tag queueing\n", host->host_no, pun, lun);
913 /* we're done negotiating */
914 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
915 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
916 SCp->device->tagged_supported = 0;
917 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
919 printk(KERN_WARNING "scsi%d (%d:%d) Unexpected REJECT Message %s\n",
920 host->host_no, pun, lun,
921 NCR_700_phase[(dsps & 0xf00) >> 8]);
922 /* however, just ignore it */
926 case A_PARITY_ERROR_MSG:
927 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
929 NCR_700_internal_bus_reset(host);
931 case A_SIMPLE_TAG_MSG:
932 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
933 pun, lun, hostdata->msgin[1],
934 NCR_700_phase[(dsps & 0xf00) >> 8]);
938 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
939 host->host_no, pun, lun,
940 NCR_700_phase[(dsps & 0xf00) >> 8]);
942 scsi_print_msg(hostdata->msgin);
945 hostdata->msgout[0] = A_REJECT_MSG;
946 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
947 script_patch_16(hostdata->script, MessageCount, 1);
948 /* SendMsgOut returns, so set up the return
950 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
954 NCR_700_writel(temp, host, TEMP_REG);
955 /* set us up to receive another message */
956 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
957 return resume_offset;
961 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
962 struct Scsi_Host *host,
963 struct NCR_700_Host_Parameters *hostdata)
965 __u32 resume_offset = 0;
966 __u8 pun = 0xff, lun=0xff;
969 pun = SCp->device->id;
970 lun = SCp->device->lun;
973 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
974 DEBUG((" COMMAND COMPLETE, status=%02x\n",
975 hostdata->status[0]));
976 /* OK, if TCQ still under negotiation, we now know it works */
977 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
978 NCR_700_set_tag_neg_state(SCp->device,
979 NCR_700_FINISHED_TAG_NEGOTIATION);
981 /* check for contingent allegiance contitions */
982 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
983 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
984 struct NCR_700_command_slot *slot =
985 (struct NCR_700_command_slot *)SCp->host_scribble;
986 if(SCp->cmnd[0] == REQUEST_SENSE) {
987 /* OOPS: bad device, returning another
988 * contingent allegiance condition */
989 printk(KERN_ERR "scsi%d (%d:%d) broken device is looping in contingent allegiance: ignoring\n", host->host_no, pun, lun);
990 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
993 scsi_print_command(SCp);
994 printk(" cmd %p has status %d, requesting sense\n",
995 SCp, hostdata->status[0]);
997 /* we can destroy the command here
998 * because the contingent allegiance
999 * condition will cause a retry which
1000 * will re-copy the command from the
1001 * saved data_cmnd. We also unmap any
1002 * data associated with the command
1004 NCR_700_unmap(hostdata, SCp, slot);
1006 SCp->cmnd[0] = REQUEST_SENSE;
1007 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1010 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1013 /* Here's a quiet hack: the
1014 * REQUEST_SENSE command is six bytes,
1015 * so store a flag indicating that
1016 * this was an internal sense request
1017 * and the original status at the end
1019 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1020 SCp->cmnd[7] = hostdata->status[0];
1022 SCp->sc_data_direction = DMA_FROM_DEVICE;
1023 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1024 SCp->cmd_len, DMA_TO_DEVICE);
1025 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1026 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1027 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1028 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1029 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1030 slot->SG[1].pAddr = 0;
1031 slot->resume_offset = hostdata->pScript;
1032 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1033 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1035 /* queue the command for reissue */
1036 slot->state = NCR_700_SLOT_QUEUED;
1037 hostdata->state = NCR_700_HOST_FREE;
1038 hostdata->cmd = NULL;
1041 // Currently rely on the mid layer evaluation
1042 // of the tag queuing capability
1044 //if(status_byte(hostdata->status[0]) == GOOD &&
1045 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1046 // /* Piggy back the tag queueing support
1047 // * on this command */
1048 // dma_sync_single_for_cpu(hostdata->dev,
1049 // slot->dma_handle,
1050 // SCp->request_bufflen,
1051 // DMA_FROM_DEVICE);
1052 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1053 // printk(KERN_INFO "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", host->host_no, pun, lun);
1054 // hostdata->tag_negotiated |= (1<<SCp->device->id);
1055 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1057 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1058 // hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1061 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1063 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1064 __u8 i = (dsps & 0xf00) >> 8;
1066 printk(KERN_ERR "scsi%d: (%d:%d), UNEXPECTED PHASE %s (%s)\n",
1067 host->host_no, pun, lun,
1069 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1070 printk(KERN_ERR " len = %d, cmd =", SCp->cmd_len);
1071 scsi_print_command(SCp);
1073 NCR_700_internal_bus_reset(host);
1074 } else if((dsps & 0xfffff000) == A_FATAL) {
1075 int i = (dsps & 0xfff);
1077 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1078 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1079 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1080 printk(KERN_ERR " msg begins %02x %02x\n",
1081 hostdata->msgin[0], hostdata->msgin[1]);
1083 NCR_700_internal_bus_reset(host);
1084 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1085 #ifdef NCR_700_DEBUG
1086 __u8 i = (dsps & 0xf00) >> 8;
1088 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1089 host->host_no, pun, lun,
1090 i, NCR_700_phase[i]);
1092 save_for_reselection(hostdata, SCp, dsp);
1094 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1096 struct NCR_700_command_slot *slot;
1097 __u8 reselection_id = hostdata->reselection_id;
1098 struct scsi_device *SDp;
1100 lun = hostdata->msgin[0] & 0x1f;
1102 hostdata->reselection_id = 0xff;
1103 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1104 host->host_no, reselection_id, lun));
1105 /* clear the reselection indicator */
1106 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1107 if(unlikely(SDp == NULL)) {
1108 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1109 host->host_no, reselection_id, lun);
1112 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1113 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1114 if(unlikely(SCp == NULL)) {
1115 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1116 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1120 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1121 DEBUG(("53c700: %d:%d:%d, reselection is tag %d, slot %p(%d)\n",
1122 host->host_no, SDp->id, SDp->lun,
1123 hostdata->msgin[2], slot, slot->tag));
1125 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1126 if(unlikely(SCp == NULL)) {
1127 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for untagged cmd\n",
1128 host->host_no, reselection_id, lun);
1131 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1135 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1136 host->host_no, reselection_id, lun,
1137 hostdata->msgin[0], hostdata->msgin[1],
1138 hostdata->msgin[2]);
1140 if(hostdata->state != NCR_700_HOST_BUSY)
1141 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1143 resume_offset = slot->resume_offset;
1144 hostdata->cmd = slot->cmnd;
1146 /* re-patch for this command */
1147 script_patch_32_abs(hostdata->script, CommandAddress,
1149 script_patch_16(hostdata->script,
1150 CommandCount, slot->cmnd->cmd_len);
1151 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1152 to32bit(&slot->pSG[0].ins));
1154 /* Note: setting SXFER only works if we're
1155 * still in the MESSAGE phase, so it is vital
1156 * that ACK is still asserted when we process
1157 * the reselection message. The resume offset
1158 * should therefore always clear ACK */
1159 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1161 dma_cache_sync(hostdata->msgin,
1162 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1163 dma_cache_sync(hostdata->msgout,
1164 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1165 /* I'm just being paranoid here, the command should
1166 * already have been flushed from the cache */
1167 dma_cache_sync(slot->cmnd->cmnd,
1168 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1173 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1175 /* This section is full of debugging code because I've
1176 * never managed to reach it. I think what happens is
1177 * that, because the 700 runs with selection
1178 * interrupts enabled the whole time that we take a
1179 * selection interrupt before we manage to get to the
1180 * reselected script interrupt */
1182 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1183 struct NCR_700_command_slot *slot;
1185 /* Take out our own ID */
1186 reselection_id &= ~(1<<host->this_id);
1188 /* I've never seen this happen, so keep this as a printk rather
1190 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1191 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1194 /* FIXME: DEBUGGING CODE */
1195 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1198 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1199 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1200 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1203 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);
1204 SCp = hostdata->slots[i].cmnd;
1208 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1209 /* change slot from busy to queued to redo command */
1210 slot->state = NCR_700_SLOT_QUEUED;
1212 hostdata->cmd = NULL;
1214 if(reselection_id == 0) {
1215 if(hostdata->reselection_id == 0xff) {
1216 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1219 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1221 reselection_id = hostdata->reselection_id;
1225 /* convert to real ID */
1226 reselection_id = bitmap_to_number(reselection_id);
1228 hostdata->reselection_id = reselection_id;
1229 /* just in case we have a stale simple tag message, clear it */
1230 hostdata->msgin[1] = 0;
1231 dma_cache_sync(hostdata->msgin,
1232 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1233 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1234 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1236 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1238 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1239 /* we've just disconnected from the bus, do nothing since
1240 * a return here will re-run the queued command slot
1241 * that may have been interrupted by the initial selection */
1242 DEBUG((" SELECTION COMPLETED\n"));
1243 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1244 resume_offset = process_message(host, hostdata, SCp,
1246 } else if((dsps & 0xfffff000) == 0) {
1247 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1248 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1249 host->host_no, pun, lun, NCR_700_condition[i],
1250 NCR_700_phase[j], dsp - hostdata->pScript);
1252 scsi_print_command(SCp);
1255 for(i = 0; i < SCp->use_sg + 1; i++) {
1256 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);
1260 NCR_700_internal_bus_reset(host);
1261 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1262 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1263 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1264 resume_offset = dsp;
1266 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1267 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1268 NCR_700_internal_bus_reset(host);
1270 return resume_offset;
1273 /* We run the 53c700 with selection interrupts always enabled. This
1274 * means that the chip may be selected as soon as the bus frees. On a
1275 * busy bus, this can be before the scripts engine finishes its
1276 * processing. Therefore, part of the selection processing has to be
1277 * to find out what the scripts engine is doing and complete the
1278 * function if necessary (i.e. process the pending disconnect or save
1279 * the interrupted initial selection */
1281 process_selection(struct Scsi_Host *host, __u32 dsp)
1283 __u8 id = 0; /* Squash compiler warning */
1285 __u32 resume_offset = 0;
1286 struct NCR_700_Host_Parameters *hostdata =
1287 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1288 struct scsi_cmnd *SCp = hostdata->cmd;
1291 for(count = 0; count < 5; count++) {
1292 id = NCR_700_readb(host, hostdata->chip710 ?
1293 CTEST9_REG : SFBR_REG);
1295 /* Take out our own ID */
1296 id &= ~(1<<host->this_id);
1301 sbcl = NCR_700_readb(host, SBCL_REG);
1302 if((sbcl & SBCL_IO) == 0) {
1303 /* mark as having been selected rather than reselected */
1306 /* convert to real ID */
1307 hostdata->reselection_id = id = bitmap_to_number(id);
1308 DEBUG(("scsi%d: Reselected by %d\n",
1309 host->host_no, id));
1311 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1312 struct NCR_700_command_slot *slot =
1313 (struct NCR_700_command_slot *)SCp->host_scribble;
1314 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));
1316 switch(dsp - hostdata->pScript) {
1317 case Ent_Disconnect1:
1318 case Ent_Disconnect2:
1319 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1321 case Ent_Disconnect3:
1322 case Ent_Disconnect4:
1323 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1325 case Ent_Disconnect5:
1326 case Ent_Disconnect6:
1327 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1329 case Ent_Disconnect7:
1330 case Ent_Disconnect8:
1331 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1335 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1339 slot->state = NCR_700_SLOT_QUEUED;
1343 hostdata->state = NCR_700_HOST_BUSY;
1344 hostdata->cmd = NULL;
1345 /* clear any stale simple tag message */
1346 hostdata->msgin[1] = 0;
1347 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1351 /* Selected as target, Ignore */
1352 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1353 } else if(hostdata->tag_negotiated & (1<<id)) {
1354 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1356 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1358 return resume_offset;
1362 NCR_700_clear_fifo(struct Scsi_Host *host) {
1363 const struct NCR_700_Host_Parameters *hostdata
1364 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1365 if(hostdata->chip710) {
1366 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1368 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1373 NCR_700_flush_fifo(struct Scsi_Host *host) {
1374 const struct NCR_700_Host_Parameters *hostdata
1375 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1376 if(hostdata->chip710) {
1377 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1379 NCR_700_writeb(0, host, CTEST8_REG);
1381 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1383 NCR_700_writeb(0, host, DFIFO_REG);
1388 /* The queue lock with interrupts disabled must be held on entry to
1391 NCR_700_start_command(struct scsi_cmnd *SCp)
1393 struct NCR_700_command_slot *slot =
1394 (struct NCR_700_command_slot *)SCp->host_scribble;
1395 struct NCR_700_Host_Parameters *hostdata =
1396 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1397 __u16 count = 1; /* for IDENTIFY message */
1399 if(hostdata->state != NCR_700_HOST_FREE) {
1400 /* keep this inside the lock to close the race window where
1401 * the running command finishes on another CPU while we don't
1402 * change the state to queued on this one */
1403 slot->state = NCR_700_SLOT_QUEUED;
1405 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1406 SCp->device->host->host_no, slot->cmnd, slot));
1409 hostdata->state = NCR_700_HOST_BUSY;
1410 hostdata->cmd = SCp;
1411 slot->state = NCR_700_SLOT_BUSY;
1412 /* keep interrupts disabled until we have the command correctly
1413 * set up so we cannot take a selection interrupt */
1415 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1417 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1418 * if the negotiated transfer parameters still hold, so
1419 * always renegotiate them */
1420 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1421 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1424 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1425 * If a contingent allegiance condition exists, the device
1426 * will refuse all tags, so send the request sense as untagged
1428 if((hostdata->tag_negotiated & (1<<SCp->device->id))
1429 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1430 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1433 if(hostdata->fast &&
1434 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1435 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1436 sizeof(NCR_700_SDTR_msg));
1437 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
1438 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
1439 count += sizeof(NCR_700_SDTR_msg);
1440 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1443 script_patch_16(hostdata->script, MessageCount, count);
1446 script_patch_ID(hostdata->script,
1447 Device_ID, 1<<SCp->device->id);
1449 script_patch_32_abs(hostdata->script, CommandAddress,
1451 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1452 /* finally plumb the beginning of the SG list into the script
1454 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1455 to32bit(&slot->pSG[0].ins));
1456 NCR_700_clear_fifo(SCp->device->host);
1458 if(slot->resume_offset == 0)
1459 slot->resume_offset = hostdata->pScript;
1460 /* now perform all the writebacks and invalidates */
1461 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1462 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1464 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1465 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1467 /* set the synchronous period/offset */
1468 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1469 SCp->device->host, SXFER_REG);
1470 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1471 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1477 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1479 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1480 struct NCR_700_Host_Parameters *hostdata =
1481 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1483 __u32 resume_offset = 0;
1484 __u8 pun = 0xff, lun = 0xff;
1485 unsigned long flags;
1488 /* Use the host lock to serialise acess to the 53c700
1489 * hardware. Note: In future, we may need to take the queue
1490 * lock to enter the done routines. When that happens, we
1491 * need to ensure that for this driver, the host lock and the
1492 * queue lock point to the same thing. */
1493 spin_lock_irqsave(host->host_lock, flags);
1494 if((istat = NCR_700_readb(host, ISTAT_REG))
1495 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1497 __u8 sstat0 = 0, dstat = 0;
1499 struct scsi_cmnd *SCp = hostdata->cmd;
1500 enum NCR_700_Host_State state;
1503 state = hostdata->state;
1504 SCp = hostdata->cmd;
1506 if(istat & SCSI_INT_PENDING) {
1509 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1512 if(istat & DMA_INT_PENDING) {
1515 dstat = NCR_700_readb(host, DSTAT_REG);
1518 dsps = NCR_700_readl(host, DSPS_REG);
1519 dsp = NCR_700_readl(host, DSP_REG);
1521 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1522 host->host_no, istat, sstat0, dstat,
1523 (dsp - (__u32)(hostdata->pScript))/4,
1527 pun = SCp->device->id;
1528 lun = SCp->device->lun;
1531 if(sstat0 & SCSI_RESET_DETECTED) {
1532 struct scsi_device *SDp;
1535 hostdata->state = NCR_700_HOST_BUSY;
1537 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1538 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1540 scsi_report_bus_reset(host, 0);
1542 /* clear all the negotiated parameters */
1543 __shost_for_each_device(SDp, host)
1544 SDp->hostdata = NULL;
1546 /* clear all the slots and their pending commands */
1547 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1548 struct scsi_cmnd *SCp;
1549 struct NCR_700_command_slot *slot =
1550 &hostdata->slots[i];
1552 if(slot->state == NCR_700_SLOT_FREE)
1556 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1558 free_slot(slot, hostdata);
1559 SCp->host_scribble = NULL;
1560 NCR_700_set_depth(SCp->device, 0);
1561 /* NOTE: deadlock potential here: we
1562 * rely on mid-layer guarantees that
1563 * scsi_done won't try to issue the
1564 * command again otherwise we'll
1566 * hostdata->state_lock */
1567 SCp->result = DID_RESET << 16;
1568 SCp->scsi_done(SCp);
1571 NCR_700_chip_setup(host);
1573 hostdata->state = NCR_700_HOST_FREE;
1574 hostdata->cmd = NULL;
1575 /* signal back if this was an eh induced reset */
1576 if(hostdata->eh_complete != NULL)
1577 complete(hostdata->eh_complete);
1579 } else if(sstat0 & SELECTION_TIMEOUT) {
1580 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1581 host->host_no, pun, lun));
1582 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1583 } else if(sstat0 & PHASE_MISMATCH) {
1584 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1585 (struct NCR_700_command_slot *)SCp->host_scribble;
1587 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1588 /* It wants to reply to some part of
1590 #ifdef NCR_700_DEBUG
1591 __u32 temp = NCR_700_readl(host, TEMP_REG);
1592 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1593 printk("scsi%d (%d:%d) PHASE MISMATCH IN SEND MESSAGE %d remain, return %p[%04x], phase %s\n", host->host_no, pun, lun, count, (void *)temp, temp - hostdata->pScript, sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1595 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1596 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1597 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1598 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1599 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1600 int residual = NCR_700_data_residual(host);
1602 #ifdef NCR_700_DEBUG
1603 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1605 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1606 host->host_no, pun, lun,
1607 SGcount, data_transfer);
1608 scsi_print_command(SCp);
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1611 host->host_no, pun, lun,
1612 SGcount, data_transfer, residual);
1615 data_transfer += residual;
1617 if(data_transfer != 0) {
1623 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1624 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1625 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1626 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1627 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1628 pAddr += (count - data_transfer);
1629 #ifdef NCR_700_DEBUG
1630 if(pAddr != naddr) {
1631 printk("scsi%d (%d:%d) transfer mismatch pAddr=%lx, naddr=%lx, data_transfer=%d, residual=%d\n", host->host_no, pun, lun, (unsigned long)pAddr, (unsigned long)naddr, data_transfer, residual);
1634 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1636 /* set the executed moves to nops */
1637 for(i=0; i<SGcount; i++) {
1638 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1639 slot->SG[i].pAddr = 0;
1641 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1642 /* and pretend we disconnected after
1643 * the command phase */
1644 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1645 /* make sure all the data is flushed */
1646 NCR_700_flush_fifo(host);
1648 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1649 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1650 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1651 NCR_700_internal_bus_reset(host);
1654 } else if(sstat0 & SCSI_GROSS_ERROR) {
1655 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1656 host->host_no, pun, lun);
1657 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1658 } else if(sstat0 & PARITY_ERROR) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1660 host->host_no, pun, lun);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(dstat & SCRIPT_INT_RECEIVED) {
1663 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1664 host->host_no, pun, lun));
1665 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1666 } else if(dstat & (ILGL_INST_DETECTED)) {
1667 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1668 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1669 host->host_no, pun, lun,
1670 dsp, dsp - hostdata->pScript);
1671 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1672 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1673 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1674 host->host_no, pun, lun, dstat);
1675 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1679 /* NOTE: selection interrupt processing MUST occur
1680 * after script interrupt processing to correctly cope
1681 * with the case where we process a disconnect and
1682 * then get reselected before we process the
1684 if(sstat0 & SELECTED) {
1685 /* FIXME: It currently takes at least FOUR
1686 * interrupts to complete a command that
1687 * disconnects: one for the disconnect, one
1688 * for the reselection, one to get the
1689 * reselection data and one to complete the
1690 * command. If we guess the reselected
1691 * command here and prepare it, we only need
1692 * to get a reselection data interrupt if we
1693 * guessed wrongly. Since the interrupt
1694 * overhead is much greater than the command
1695 * setup, this would be an efficient
1696 * optimisation particularly as we probably
1697 * only have one outstanding command on a
1698 * target most of the time */
1700 resume_offset = process_selection(host, dsp);
1707 if(hostdata->state != NCR_700_HOST_BUSY) {
1708 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1709 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1710 hostdata->state = NCR_700_HOST_BUSY;
1713 DEBUG(("Attempting to resume at %x\n", resume_offset));
1714 NCR_700_clear_fifo(host);
1715 NCR_700_writel(resume_offset, host, DSP_REG);
1717 /* There is probably a technical no-no about this: If we're a
1718 * shared interrupt and we got this interrupt because the
1719 * other device needs servicing not us, we're still going to
1720 * check our queued commands here---of course, there shouldn't
1721 * be any outstanding.... */
1722 if(hostdata->state == NCR_700_HOST_FREE) {
1725 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1726 /* fairness: always run the queue from the last
1727 * position we left off */
1728 int j = (i + hostdata->saved_slot_position)
1729 % NCR_700_COMMAND_SLOTS_PER_HOST;
1731 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1733 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1734 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1735 host->host_no, &hostdata->slots[j],
1736 hostdata->slots[j].cmnd));
1737 hostdata->saved_slot_position = j + 1;
1744 spin_unlock_irqrestore(host->host_lock, flags);
1745 return IRQ_RETVAL(handled);
1749 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1751 struct NCR_700_Host_Parameters *hostdata =
1752 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1754 enum dma_data_direction direction;
1755 struct NCR_700_command_slot *slot;
1757 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1758 /* We're over our allocation, this should never happen
1759 * since we report the max allocation to the mid layer */
1760 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1763 /* check for untagged commands. We cannot have any outstanding
1764 * commands if we accept them. Commands could be untagged because:
1766 * - The tag negotiated bitmap is clear
1767 * - The blk layer sent and untagged command
1769 if(NCR_700_get_depth(SCp->device) != 0
1770 && (!(hostdata->tag_negotiated & (1<<SCp->device->id))
1771 || !blk_rq_tagged(SCp->request))) {
1772 DEBUG((KERN_ERR "scsi%d (%d:%d) has non zero depth %d\n",
1773 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1774 NCR_700_get_depth(SCp->device)));
1775 return SCSI_MLQUEUE_DEVICE_BUSY;
1777 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1778 DEBUG((KERN_ERR "scsi%d (%d:%d) has max tag depth %d\n",
1779 SCp->device->host->host_no, SCp->device->id, SCp->device->lun,
1780 NCR_700_get_depth(SCp->device)));
1781 return SCSI_MLQUEUE_DEVICE_BUSY;
1783 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1785 /* begin the command here */
1786 /* no need to check for NULL, test for command_slot_count above
1787 * ensures a slot is free */
1788 slot = find_empty_slot(hostdata);
1792 SCp->scsi_done = done;
1793 SCp->host_scribble = (unsigned char *)slot;
1794 SCp->SCp.ptr = NULL;
1795 SCp->SCp.buffer = NULL;
1797 #ifdef NCR_700_DEBUG
1798 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1799 scsi_print_command(SCp);
1801 if(blk_rq_tagged(SCp->request)
1802 && (hostdata->tag_negotiated &(1<<SCp->device->id)) == 0
1803 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1804 printk(KERN_ERR "scsi%d: (%d:%d) Enabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1805 hostdata->tag_negotiated |= (1<<SCp->device->id);
1806 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1809 /* here we may have to process an untagged command. The gate
1810 * above ensures that this will be the only one outstanding,
1811 * so clear the tag negotiated bit.
1813 * FIXME: This will royally screw up on multiple LUN devices
1815 if(!blk_rq_tagged(SCp->request)
1816 && (hostdata->tag_negotiated &(1<<SCp->device->id))) {
1817 printk(KERN_INFO "scsi%d: (%d:%d) Disabling Tag Command Queuing\n", SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1818 hostdata->tag_negotiated &= ~(1<<SCp->device->id);
1821 if((hostdata->tag_negotiated &(1<<SCp->device->id))
1822 && scsi_get_tag_type(SCp->device)) {
1823 slot->tag = SCp->request->tag;
1824 DEBUG(("53c700 %d:%d:%d, sending out tag %d, slot %p\n",
1825 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, slot->tag,
1828 slot->tag = SCSI_NO_TAG;
1829 /* must populate current_cmnd for scsi_find_tag to work */
1830 SCp->device->current_cmnd = SCp;
1832 /* sanity check: some of the commands generated by the mid-layer
1833 * have an eccentric idea of their sc_data_direction */
1834 if(!SCp->use_sg && !SCp->request_bufflen
1835 && SCp->sc_data_direction != DMA_NONE) {
1836 #ifdef NCR_700_DEBUG
1837 printk("53c700: Command");
1838 scsi_print_command(SCp);
1839 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1841 SCp->sc_data_direction = DMA_NONE;
1844 switch (SCp->cmnd[0]) {
1846 /* clear the internal sense magic */
1850 /* OK, get it from the command */
1851 switch(SCp->sc_data_direction) {
1852 case DMA_BIDIRECTIONAL:
1854 printk(KERN_ERR "53c700: Unknown command for data direction ");
1855 scsi_print_command(SCp);
1862 case DMA_FROM_DEVICE:
1863 move_ins = SCRIPT_MOVE_DATA_IN;
1866 move_ins = SCRIPT_MOVE_DATA_OUT;
1871 /* now build the scatter gather list */
1872 direction = SCp->sc_data_direction;
1876 dma_addr_t vPtr = 0;
1880 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1881 SCp->use_sg, direction);
1883 vPtr = dma_map_single(hostdata->dev,
1884 SCp->request_buffer,
1885 SCp->request_bufflen,
1887 count = SCp->request_bufflen;
1888 slot->dma_handle = vPtr;
1893 for(i = 0; i < sg_count; i++) {
1896 struct scatterlist *sg = SCp->buffer;
1898 vPtr = sg_dma_address(&sg[i]);
1899 count = sg_dma_len(&sg[i]);
1902 slot->SG[i].ins = bS_to_host(move_ins | count);
1903 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1904 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1905 slot->SG[i].pAddr = bS_to_host(vPtr);
1907 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1908 slot->SG[i].pAddr = 0;
1909 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1910 DEBUG((" SETTING %08lx to %x\n",
1911 (&slot->pSG[i].ins),
1914 slot->resume_offset = 0;
1915 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1916 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1917 NCR_700_start_command(SCp);
1922 NCR_700_abort(struct scsi_cmnd * SCp)
1924 struct NCR_700_command_slot *slot;
1926 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants to abort command\n\t",
1927 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1928 scsi_print_command(SCp);
1930 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1933 /* no outstanding command to abort */
1935 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1936 /* FIXME: This is because of a problem in the new
1937 * error handler. When it is in error recovery, it
1938 * will send a TUR to a device it thinks may still be
1939 * showing a problem. If the TUR isn't responded to,
1940 * it will abort it and mark the device off line.
1941 * Unfortunately, it does no other error recovery, so
1942 * this would leave us with an outstanding command
1943 * occupying a slot. Rather than allow this to
1944 * happen, we issue a bus reset to force all
1945 * outstanding commands to terminate here. */
1946 NCR_700_internal_bus_reset(SCp->device->host);
1947 /* still drop through and return failed */
1954 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1956 DECLARE_COMPLETION(complete);
1957 struct NCR_700_Host_Parameters *hostdata =
1958 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1960 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants BUS reset, cmd %p\n\t",
1961 SCp->device->host->host_no, SCp->device->id, SCp->device->lun, SCp);
1962 scsi_print_command(SCp);
1963 /* In theory, eh_complete should always be null because the
1964 * eh is single threaded, but just in case we're handling a
1965 * reset via sg or something */
1966 while(hostdata->eh_complete != NULL) {
1967 spin_unlock_irq(SCp->device->host->host_lock);
1968 msleep_interruptible(100);
1969 spin_lock_irq(SCp->device->host->host_lock);
1971 hostdata->eh_complete = &complete;
1972 NCR_700_internal_bus_reset(SCp->device->host);
1973 spin_unlock_irq(SCp->device->host->host_lock);
1974 wait_for_completion(&complete);
1975 spin_lock_irq(SCp->device->host->host_lock);
1976 hostdata->eh_complete = NULL;
1977 /* Revalidate the transport parameters of the failing device */
1979 spi_schedule_dv_device(SCp->device);
1984 NCR_700_dev_reset(struct scsi_cmnd * SCp)
1986 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants device reset\n\t",
1987 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1988 scsi_print_command(SCp);
1994 NCR_700_host_reset(struct scsi_cmnd * SCp)
1996 printk(KERN_INFO "scsi%d (%d:%d) New error handler wants HOST reset\n\t",
1997 SCp->device->host->host_no, SCp->device->id, SCp->device->lun);
1998 scsi_print_command(SCp);
2000 NCR_700_internal_bus_reset(SCp->device->host);
2001 NCR_700_chip_reset(SCp->device->host);
2006 NCR_700_set_period(struct scsi_target *STp, int period)
2008 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2009 struct NCR_700_Host_Parameters *hostdata =
2010 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2015 if(period < hostdata->min_period)
2016 period = hostdata->min_period;
2018 spi_period(STp) = period;
2019 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2020 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2021 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2025 NCR_700_set_offset(struct scsi_target *STp, int offset)
2027 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2028 struct NCR_700_Host_Parameters *hostdata =
2029 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2030 int max_offset = hostdata->chip710
2031 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2036 if(offset > max_offset)
2037 offset = max_offset;
2039 /* if we're currently async, make sure the period is reasonable */
2040 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2041 spi_period(STp) > 0xff))
2042 spi_period(STp) = hostdata->min_period;
2044 spi_offset(STp) = offset;
2045 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2046 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2047 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2053 NCR_700_slave_configure(struct scsi_device *SDp)
2055 struct NCR_700_Host_Parameters *hostdata =
2056 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2058 /* to do here: allocate memory; build a queue_full list */
2059 if(SDp->tagged_supported) {
2060 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2061 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2062 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2064 /* initialise to default depth */
2065 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2067 if(hostdata->fast) {
2068 /* Find the correct offset and period via domain validation */
2069 if (!spi_initial_dv(SDp->sdev_target))
2072 spi_offset(SDp->sdev_target) = 0;
2073 spi_period(SDp->sdev_target) = 0;
2079 NCR_700_slave_destroy(struct scsi_device *SDp)
2081 /* to do here: deallocate memory */
2085 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2087 if (depth > NCR_700_MAX_TAGS)
2088 depth = NCR_700_MAX_TAGS;
2090 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2094 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2096 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2097 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2098 struct NCR_700_Host_Parameters *hostdata =
2099 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2101 scsi_set_tag_type(SDp, tag_type);
2103 /* We have a global (per target) flag to track whether TCQ is
2104 * enabled, so we'll be turning it off for the entire target here.
2105 * our tag algorithm will fail if we mix tagged and untagged commands,
2106 * so quiesce the device before doing this */
2108 scsi_target_quiesce(SDp->sdev_target);
2111 /* shift back to the default unqueued number of commands
2112 * (the user can still raise this) */
2113 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2114 hostdata->tag_negotiated &= ~(1 << SDp->id);
2116 /* Here, we cleared the negotiation flag above, so this
2117 * will force the driver to renegotiate */
2118 scsi_activate_tcq(SDp, SDp->queue_depth);
2120 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2123 scsi_target_resume(SDp->sdev_target);
2129 NCR_700_show_active_tags(struct device *dev, char *buf)
2131 struct scsi_device *SDp = to_scsi_device(dev);
2133 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2136 static struct device_attribute NCR_700_active_tags_attr = {
2138 .name = "active_tags",
2141 .show = NCR_700_show_active_tags,
2144 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
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);