1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 **-----------------------------------------------------------------------------
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/kernel.h>
118 #include <linux/types.h>
119 #include <linux/string.h>
120 #include <linux/ioport.h>
121 #include <linux/delay.h>
122 #include <linux/spinlock.h>
123 #include <linux/completion.h>
124 #include <linux/init.h>
125 #include <linux/proc_fs.h>
126 #include <linux/blkdev.h>
127 #include <linux/module.h>
128 #include <linux/interrupt.h>
129 #include <linux/device.h>
131 #include <asm/system.h>
133 #include <asm/pgtable.h>
134 #include <asm/byteorder.h>
136 #include <scsi/scsi.h>
137 #include <scsi/scsi_cmnd.h>
138 #include <scsi/scsi_dbg.h>
139 #include <scsi/scsi_eh.h>
140 #include <scsi/scsi_host.h>
141 #include <scsi/scsi_tcq.h>
142 #include <scsi/scsi_transport.h>
143 #include <scsi/scsi_transport_spi.h>
147 /* NOTE: For 64 bit drivers there are points in the code where we use
148 * a non dereferenceable pointer to point to a structure in dma-able
149 * memory (which is 32 bits) so that we can use all of the structure
150 * operations but take the address at the end. This macro allows us
151 * to truncate the 64 bit pointer down to 32 bits without the compiler
153 #define to32bit(x) ((__u32)((unsigned long)(x)))
158 #define STATIC static
161 MODULE_AUTHOR("James Bottomley");
162 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
163 MODULE_LICENSE("GPL");
165 /* This is the script */
166 #include "53c700_d.h"
169 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
170 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
171 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
172 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
173 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
174 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
175 STATIC int NCR_700_slave_alloc(struct scsi_device *SDpnt);
176 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
177 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
178 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
179 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
181 STATIC struct device_attribute *NCR_700_dev_attrs[];
183 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
185 static char *NCR_700_phase[] = {
188 "before command phase",
189 "after command phase",
190 "after status phase",
191 "after data in phase",
192 "after data out phase",
196 static char *NCR_700_condition[] = {
204 "REJECT_MSG RECEIVED",
205 "DISCONNECT_MSG RECEIVED",
211 static char *NCR_700_fatal_messages[] = {
212 "unexpected message after reselection",
213 "still MSG_OUT after message injection",
214 "not MSG_IN after selection",
215 "Illegal message length received",
218 static char *NCR_700_SBCL_bits[] = {
229 static char *NCR_700_SBCL_to_phase[] = {
240 /* This translates the SDTR message offset and period to a value
241 * which can be loaded into the SXFER_REG.
243 * NOTE: According to SCSI-2, the true transfer period (in ns) is
244 * actually four times this period value */
246 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
247 __u8 offset, __u8 period)
251 __u8 min_xferp = (hostdata->chip710
252 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
253 __u8 max_offset = (hostdata->chip710
254 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
259 if(period < hostdata->min_period) {
260 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
261 period = hostdata->min_period;
263 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
264 if(offset > max_offset) {
265 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
269 if(XFERP < min_xferp) {
272 return (offset & 0x0f) | (XFERP & 0x07)<<4;
276 NCR_700_get_SXFER(struct scsi_device *SDp)
278 struct NCR_700_Host_Parameters *hostdata =
279 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
281 return NCR_700_offset_period_to_sxfer(hostdata,
282 spi_offset(SDp->sdev_target),
283 spi_period(SDp->sdev_target));
287 NCR_700_detect(struct scsi_host_template *tpnt,
288 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
290 dma_addr_t pScript, pSlots;
293 struct Scsi_Host *host;
294 static int banner = 0;
297 if(tpnt->sdev_attrs == NULL)
298 tpnt->sdev_attrs = NCR_700_dev_attrs;
300 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
301 &pScript, GFP_KERNEL);
303 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
307 script = (__u32 *)memory;
308 hostdata->msgin = memory + MSGIN_OFFSET;
309 hostdata->msgout = memory + MSGOUT_OFFSET;
310 hostdata->status = memory + STATUS_OFFSET;
311 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
312 * if this isn't sufficient separation to avoid dma flushing issues */
313 BUG_ON(!dma_is_consistent(hostdata->dev, pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
314 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
317 pSlots = pScript + SLOTS_OFFSET;
319 /* Fill in the missing routines from the host template */
320 tpnt->queuecommand = NCR_700_queuecommand;
321 tpnt->eh_abort_handler = NCR_700_abort;
322 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
323 tpnt->eh_host_reset_handler = NCR_700_host_reset;
324 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
325 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
326 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
327 tpnt->use_clustering = ENABLE_CLUSTERING;
328 tpnt->slave_configure = NCR_700_slave_configure;
329 tpnt->slave_destroy = NCR_700_slave_destroy;
330 tpnt->slave_alloc = NCR_700_slave_alloc;
331 tpnt->change_queue_depth = NCR_700_change_queue_depth;
332 tpnt->change_queue_type = NCR_700_change_queue_type;
334 if(tpnt->name == NULL)
335 tpnt->name = "53c700";
336 if(tpnt->proc_name == NULL)
337 tpnt->proc_name = "53c700";
339 host = scsi_host_alloc(tpnt, 4);
342 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
343 * NCR_700_COMMAND_SLOTS_PER_HOST);
344 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
345 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
346 - (unsigned long)&hostdata->slots[0].SG[0]);
347 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
349 hostdata->free_list = &hostdata->slots[j];
351 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
352 hostdata->slots[j].state = NCR_700_SLOT_FREE;
355 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
356 script[j] = bS_to_host(SCRIPT[j]);
358 /* adjust all labels to be bus physical */
359 for (j = 0; j < PATCHES; j++)
360 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
361 /* now patch up fixed addresses. */
362 script_patch_32(hostdata->dev, script, MessageLocation,
363 pScript + MSGOUT_OFFSET);
364 script_patch_32(hostdata->dev, script, StatusAddress,
365 pScript + STATUS_OFFSET);
366 script_patch_32(hostdata->dev, script, ReceiveMsgAddress,
367 pScript + MSGIN_OFFSET);
369 hostdata->script = script;
370 hostdata->pScript = pScript;
371 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
372 hostdata->state = NCR_700_HOST_FREE;
373 hostdata->cmd = NULL;
375 host->max_lun = NCR_700_MAX_LUNS;
376 BUG_ON(NCR_700_transport_template == NULL);
377 host->transportt = NCR_700_transport_template;
378 host->unique_id = (unsigned long)hostdata->base;
379 hostdata->eh_complete = NULL;
380 host->hostdata[0] = (unsigned long)hostdata;
382 NCR_700_writeb(0xff, host, CTEST9_REG);
383 if (hostdata->chip710)
384 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
386 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
387 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
389 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
392 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
393 hostdata->chip710 ? "53c710" :
394 (hostdata->fast ? "53c700-66" : "53c700"),
395 hostdata->rev, hostdata->differential ?
396 "(Differential)" : "");
398 NCR_700_chip_reset(host);
400 if (scsi_add_host(host, dev)) {
401 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
406 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
413 NCR_700_release(struct Scsi_Host *host)
415 struct NCR_700_Host_Parameters *hostdata =
416 (struct NCR_700_Host_Parameters *)host->hostdata[0];
418 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
419 hostdata->script, hostdata->pScript);
424 NCR_700_identify(int can_disconnect, __u8 lun)
426 return IDENTIFY_BASE |
427 ((can_disconnect) ? 0x40 : 0) |
428 (lun & NCR_700_LUN_MASK);
432 * Function : static int data_residual (Scsi_Host *host)
434 * Purpose : return residual data count of what's in the chip. If you
435 * really want to know what this function is doing, it's almost a
436 * direct transcription of the algorithm described in the 53c710
437 * guide, except that the DBC and DFIFO registers are only 6 bits
440 * Inputs : host - SCSI host */
442 NCR_700_data_residual (struct Scsi_Host *host) {
443 struct NCR_700_Host_Parameters *hostdata =
444 (struct NCR_700_Host_Parameters *)host->hostdata[0];
445 int count, synchronous = 0;
448 if(hostdata->chip710) {
449 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
450 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
452 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
453 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
457 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
459 /* get the data direction */
460 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
465 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
467 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
471 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
472 if (sstat & SODL_REG_FULL)
474 if (synchronous && (sstat & SODR_REG_FULL))
479 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
484 /* print out the SCSI wires and corresponding phase from the SBCL register
487 sbcl_to_string(__u8 sbcl)
490 static char ret[256];
495 strcat(ret, NCR_700_SBCL_bits[i]);
497 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
502 bitmap_to_number(__u8 bitmap)
506 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
511 /* Pull a slot off the free list */
512 STATIC struct NCR_700_command_slot *
513 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
515 struct NCR_700_command_slot *slot = hostdata->free_list;
519 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
520 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
524 if(slot->state != NCR_700_SLOT_FREE)
526 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
529 hostdata->free_list = slot->ITL_forw;
530 slot->ITL_forw = NULL;
533 /* NOTE: set the state to busy here, not queued, since this
534 * indicates the slot is in use and cannot be run by the IRQ
535 * finish routine. If we cannot queue the command when it
536 * is properly build, we then change to NCR_700_SLOT_QUEUED */
537 slot->state = NCR_700_SLOT_BUSY;
539 hostdata->command_slot_count++;
545 free_slot(struct NCR_700_command_slot *slot,
546 struct NCR_700_Host_Parameters *hostdata)
548 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
549 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
551 if(slot->state == NCR_700_SLOT_FREE) {
552 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
555 slot->resume_offset = 0;
557 slot->state = NCR_700_SLOT_FREE;
558 slot->ITL_forw = hostdata->free_list;
559 hostdata->free_list = slot;
560 hostdata->command_slot_count--;
564 /* This routine really does very little. The command is indexed on
565 the ITL and (if tagged) the ITLQ lists in _queuecommand */
567 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
568 struct scsi_cmnd *SCp, __u32 dsp)
570 /* Its just possible that this gets executed twice */
572 struct NCR_700_command_slot *slot =
573 (struct NCR_700_command_slot *)SCp->host_scribble;
575 slot->resume_offset = dsp;
577 hostdata->state = NCR_700_HOST_FREE;
578 hostdata->cmd = NULL;
582 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
583 struct NCR_700_command_slot *slot)
585 if(SCp->sc_data_direction != DMA_NONE &&
586 SCp->sc_data_direction != DMA_BIDIRECTIONAL)
591 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
592 struct scsi_cmnd *SCp, int result)
594 hostdata->state = NCR_700_HOST_FREE;
595 hostdata->cmd = NULL;
598 struct NCR_700_command_slot *slot =
599 (struct NCR_700_command_slot *)SCp->host_scribble;
601 dma_unmap_single(hostdata->dev, slot->pCmd,
602 sizeof(SCp->cmnd), DMA_TO_DEVICE);
603 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
604 char *cmnd = NCR_700_get_sense_cmnd(SCp->device);
606 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
607 SCp, SCp->cmnd[7], result);
608 scsi_print_sense("53c700", SCp);
611 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
612 /* restore the old result if the request sense was
616 /* restore the original length */
617 SCp->cmd_len = cmnd[8];
619 NCR_700_unmap(hostdata, SCp, slot);
621 free_slot(slot, hostdata);
623 if(NCR_700_get_depth(SCp->device) == 0 ||
624 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
625 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
626 NCR_700_get_depth(SCp->device));
627 #endif /* NCR_700_DEBUG */
628 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
630 SCp->host_scribble = NULL;
631 SCp->result = result;
634 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
640 NCR_700_internal_bus_reset(struct Scsi_Host *host)
643 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
645 NCR_700_writeb(0, host, SCNTL1_REG);
650 NCR_700_chip_setup(struct Scsi_Host *host)
652 struct NCR_700_Host_Parameters *hostdata =
653 (struct NCR_700_Host_Parameters *)host->hostdata[0];
655 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
657 if(hostdata->chip710) {
658 __u8 burst_disable = 0;
659 __u8 burst_length = 0;
661 switch (hostdata->burst_length) {
663 burst_length = BURST_LENGTH_1;
666 burst_length = BURST_LENGTH_2;
669 burst_length = BURST_LENGTH_4;
672 burst_length = BURST_LENGTH_8;
675 burst_disable = BURST_DISABLE;
678 hostdata->dcntl_extra |= COMPAT_700_MODE;
680 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
681 NCR_700_writeb(burst_length | hostdata->dmode_extra,
682 host, DMODE_710_REG);
683 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
684 (hostdata->differential ? DIFF : 0),
686 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
687 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
688 | AUTO_ATN, host, SCNTL0_REG);
690 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
691 host, DMODE_700_REG);
692 NCR_700_writeb(hostdata->differential ?
693 DIFF : 0, host, CTEST7_REG);
695 /* this is for 700-66, does nothing on 700 */
696 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
697 | GENERATE_RECEIVE_PARITY, host,
700 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
701 | PARITY | AUTO_ATN, host, SCNTL0_REG);
705 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
706 NCR_700_writeb(0, host, SBCL_REG);
707 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
709 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
710 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
712 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
713 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
714 if(hostdata->clock > 75) {
715 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
716 /* do the best we can, but the async clock will be out
717 * of spec: sync divider 2, async divider 3 */
718 DEBUG(("53c700: sync 2 async 3\n"));
719 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
720 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
721 hostdata->sync_clock = hostdata->clock/2;
722 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
723 /* sync divider 1.5, async divider 3 */
724 DEBUG(("53c700: sync 1.5 async 3\n"));
725 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
726 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
727 hostdata->sync_clock = hostdata->clock*2;
728 hostdata->sync_clock /= 3;
730 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
731 /* sync divider 1, async divider 2 */
732 DEBUG(("53c700: sync 1 async 2\n"));
733 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
734 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
735 hostdata->sync_clock = hostdata->clock;
736 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
737 /* sync divider 1, async divider 1.5 */
738 DEBUG(("53c700: sync 1 async 1.5\n"));
739 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
740 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
741 hostdata->sync_clock = hostdata->clock;
743 DEBUG(("53c700: sync 1 async 1\n"));
744 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
745 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
746 /* sync divider 1, async divider 1 */
747 hostdata->sync_clock = hostdata->clock;
749 /* Calculate the actual minimum period that can be supported
750 * by our synchronous clock speed. See the 710 manual for
751 * exact details of this calculation which is based on a
752 * setting of the SXFER register */
753 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
754 hostdata->min_period = NCR_700_MIN_PERIOD;
755 if(min_period > NCR_700_MIN_PERIOD)
756 hostdata->min_period = min_period;
760 NCR_700_chip_reset(struct Scsi_Host *host)
762 struct NCR_700_Host_Parameters *hostdata =
763 (struct NCR_700_Host_Parameters *)host->hostdata[0];
764 if(hostdata->chip710) {
765 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
768 NCR_700_writeb(0, host, ISTAT_REG);
770 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
773 NCR_700_writeb(0, host, DCNTL_REG);
778 NCR_700_chip_setup(host);
781 /* The heart of the message processing engine is that the instruction
782 * immediately after the INT is the normal case (and so must be CLEAR
783 * ACK). If we want to do something else, we call that routine in
784 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
785 * ACK) so that the routine returns correctly to resume its activity
788 process_extended_message(struct Scsi_Host *host,
789 struct NCR_700_Host_Parameters *hostdata,
790 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
792 __u32 resume_offset = dsp, temp = dsp + 8;
793 __u8 pun = 0xff, lun = 0xff;
796 pun = SCp->device->id;
797 lun = SCp->device->lun;
800 switch(hostdata->msgin[2]) {
802 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
803 struct scsi_target *starget = SCp->device->sdev_target;
804 __u8 period = hostdata->msgin[3];
805 __u8 offset = hostdata->msgin[4];
807 if(offset == 0 || period == 0) {
812 spi_offset(starget) = offset;
813 spi_period(starget) = period;
815 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
816 spi_display_xfer_agreement(starget);
817 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
820 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
821 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
823 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
827 /* SDTR message out of the blue, reject it */
828 shost_printk(KERN_WARNING, host,
829 "Unexpected SDTR msg\n");
830 hostdata->msgout[0] = A_REJECT_MSG;
831 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
832 script_patch_16(hostdata->dev, hostdata->script,
834 /* SendMsgOut returns, so set up the return
836 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
841 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
842 host->host_no, pun, lun);
843 hostdata->msgout[0] = A_REJECT_MSG;
844 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
845 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
847 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
852 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
853 host->host_no, pun, lun,
854 NCR_700_phase[(dsps & 0xf00) >> 8]);
855 spi_print_msg(hostdata->msgin);
858 hostdata->msgout[0] = A_REJECT_MSG;
859 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
860 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
862 /* SendMsgOut returns, so set up the return
864 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
866 NCR_700_writel(temp, host, TEMP_REG);
867 return resume_offset;
871 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
872 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
874 /* work out where to return to */
875 __u32 temp = dsp + 8, resume_offset = dsp;
876 __u8 pun = 0xff, lun = 0xff;
879 pun = SCp->device->id;
880 lun = SCp->device->lun;
884 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
885 NCR_700_phase[(dsps & 0xf00) >> 8]);
886 spi_print_msg(hostdata->msgin);
890 switch(hostdata->msgin[0]) {
893 resume_offset = process_extended_message(host, hostdata, SCp,
898 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
899 /* Rejected our sync negotiation attempt */
900 spi_period(SCp->device->sdev_target) =
901 spi_offset(SCp->device->sdev_target) = 0;
902 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
903 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
904 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
905 /* rejected our first simple tag message */
906 scmd_printk(KERN_WARNING, SCp,
907 "Rejected first tag queue attempt, turning off tag queueing\n");
908 /* we're done negotiating */
909 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
910 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
911 SCp->device->tagged_supported = 0;
912 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
914 shost_printk(KERN_WARNING, host,
915 "(%d:%d) Unexpected REJECT Message %s\n",
917 NCR_700_phase[(dsps & 0xf00) >> 8]);
918 /* however, just ignore it */
922 case A_PARITY_ERROR_MSG:
923 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
925 NCR_700_internal_bus_reset(host);
927 case A_SIMPLE_TAG_MSG:
928 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
929 pun, lun, hostdata->msgin[1],
930 NCR_700_phase[(dsps & 0xf00) >> 8]);
934 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
935 host->host_no, pun, lun,
936 NCR_700_phase[(dsps & 0xf00) >> 8]);
938 spi_print_msg(hostdata->msgin);
941 hostdata->msgout[0] = A_REJECT_MSG;
942 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
943 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
945 /* SendMsgOut returns, so set up the return
947 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
951 NCR_700_writel(temp, host, TEMP_REG);
952 /* set us up to receive another message */
953 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
954 return resume_offset;
958 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
959 struct Scsi_Host *host,
960 struct NCR_700_Host_Parameters *hostdata)
962 __u32 resume_offset = 0;
963 __u8 pun = 0xff, lun=0xff;
966 pun = SCp->device->id;
967 lun = SCp->device->lun;
970 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
971 DEBUG((" COMMAND COMPLETE, status=%02x\n",
972 hostdata->status[0]));
973 /* OK, if TCQ still under negotiation, we now know it works */
974 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
975 NCR_700_set_tag_neg_state(SCp->device,
976 NCR_700_FINISHED_TAG_NEGOTIATION);
978 /* check for contingent allegiance contitions */
979 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
980 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
981 struct NCR_700_command_slot *slot =
982 (struct NCR_700_command_slot *)SCp->host_scribble;
983 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
984 /* OOPS: bad device, returning another
985 * contingent allegiance condition */
986 scmd_printk(KERN_ERR, SCp,
987 "broken device is looping in contingent allegiance: ignoring\n");
988 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
991 NCR_700_get_sense_cmnd(SCp->device);
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);
1005 dma_unmap_single(hostdata->dev, slot->pCmd,
1009 cmnd[0] = REQUEST_SENSE;
1010 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1013 cmnd[4] = sizeof(SCp->sense_buffer);
1015 /* Here's a quiet hack: the
1016 * REQUEST_SENSE command is six bytes,
1017 * so store a flag indicating that
1018 * this was an internal sense request
1019 * and the original status at the end
1021 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1022 cmnd[7] = hostdata->status[0];
1023 cmnd[8] = SCp->cmd_len;
1024 SCp->cmd_len = 6; /* command length for
1026 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1027 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1028 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1029 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1030 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1031 slot->SG[1].pAddr = 0;
1032 slot->resume_offset = hostdata->pScript;
1033 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1034 dma_cache_sync(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1036 /* queue the command for reissue */
1037 slot->state = NCR_700_SLOT_QUEUED;
1038 slot->flags = NCR_700_FLAG_AUTOSENSE;
1039 hostdata->state = NCR_700_HOST_FREE;
1040 hostdata->cmd = NULL;
1043 // Currently rely on the mid layer evaluation
1044 // of the tag queuing capability
1046 //if(status_byte(hostdata->status[0]) == GOOD &&
1047 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1048 // /* Piggy back the tag queueing support
1049 // * on this command */
1050 // dma_sync_single_for_cpu(hostdata->dev,
1051 // slot->dma_handle,
1052 // SCp->request_bufflen,
1053 // DMA_FROM_DEVICE);
1054 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1055 // scmd_printk(KERN_INFO, SCp,
1056 // "Enabling Tag Command Queuing\n");
1057 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1058 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1060 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1061 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1064 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1066 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1067 __u8 i = (dsps & 0xf00) >> 8;
1069 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1071 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1072 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1074 scsi_print_command(SCp);
1076 NCR_700_internal_bus_reset(host);
1077 } else if((dsps & 0xfffff000) == A_FATAL) {
1078 int i = (dsps & 0xfff);
1080 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1081 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1082 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1083 printk(KERN_ERR " msg begins %02x %02x\n",
1084 hostdata->msgin[0], hostdata->msgin[1]);
1086 NCR_700_internal_bus_reset(host);
1087 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1088 #ifdef NCR_700_DEBUG
1089 __u8 i = (dsps & 0xf00) >> 8;
1091 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1092 host->host_no, pun, lun,
1093 i, NCR_700_phase[i]);
1095 save_for_reselection(hostdata, SCp, dsp);
1097 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1099 struct NCR_700_command_slot *slot;
1100 __u8 reselection_id = hostdata->reselection_id;
1101 struct scsi_device *SDp;
1103 lun = hostdata->msgin[0] & 0x1f;
1105 hostdata->reselection_id = 0xff;
1106 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1107 host->host_no, reselection_id, lun));
1108 /* clear the reselection indicator */
1109 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1110 if(unlikely(SDp == NULL)) {
1111 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1112 host->host_no, reselection_id, lun);
1115 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1116 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1117 if(unlikely(SCp == NULL)) {
1118 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1119 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1123 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1124 DDEBUG(KERN_DEBUG, SDp,
1125 "reselection is tag %d, slot %p(%d)\n",
1126 hostdata->msgin[2], slot, slot->tag);
1128 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1129 if(unlikely(SCp == NULL)) {
1130 sdev_printk(KERN_ERR, SDp,
1131 "no saved request for untagged cmd\n");
1134 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1138 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1139 host->host_no, reselection_id, lun,
1140 hostdata->msgin[0], hostdata->msgin[1],
1141 hostdata->msgin[2]);
1143 if(hostdata->state != NCR_700_HOST_BUSY)
1144 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1146 resume_offset = slot->resume_offset;
1147 hostdata->cmd = slot->cmnd;
1149 /* re-patch for this command */
1150 script_patch_32_abs(hostdata->dev, hostdata->script,
1151 CommandAddress, slot->pCmd);
1152 script_patch_16(hostdata->dev, hostdata->script,
1153 CommandCount, slot->cmnd->cmd_len);
1154 script_patch_32_abs(hostdata->dev, hostdata->script,
1155 SGScriptStartAddress,
1156 to32bit(&slot->pSG[0].ins));
1158 /* Note: setting SXFER only works if we're
1159 * still in the MESSAGE phase, so it is vital
1160 * that ACK is still asserted when we process
1161 * the reselection message. The resume offset
1162 * should therefore always clear ACK */
1163 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1165 dma_cache_sync(hostdata->dev, hostdata->msgin,
1166 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1167 dma_cache_sync(hostdata->dev, hostdata->msgout,
1168 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1169 /* I'm just being paranoid here, the command should
1170 * already have been flushed from the cache */
1171 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1172 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1177 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1179 /* This section is full of debugging code because I've
1180 * never managed to reach it. I think what happens is
1181 * that, because the 700 runs with selection
1182 * interrupts enabled the whole time that we take a
1183 * selection interrupt before we manage to get to the
1184 * reselected script interrupt */
1186 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1187 struct NCR_700_command_slot *slot;
1189 /* Take out our own ID */
1190 reselection_id &= ~(1<<host->this_id);
1192 /* I've never seen this happen, so keep this as a printk rather
1194 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1195 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1198 /* FIXME: DEBUGGING CODE */
1199 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1202 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1203 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1204 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1207 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);
1208 SCp = hostdata->slots[i].cmnd;
1212 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1213 /* change slot from busy to queued to redo command */
1214 slot->state = NCR_700_SLOT_QUEUED;
1216 hostdata->cmd = NULL;
1218 if(reselection_id == 0) {
1219 if(hostdata->reselection_id == 0xff) {
1220 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1223 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1225 reselection_id = hostdata->reselection_id;
1229 /* convert to real ID */
1230 reselection_id = bitmap_to_number(reselection_id);
1232 hostdata->reselection_id = reselection_id;
1233 /* just in case we have a stale simple tag message, clear it */
1234 hostdata->msgin[1] = 0;
1235 dma_cache_sync(hostdata->dev, hostdata->msgin,
1236 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1237 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1238 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1240 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1242 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1243 /* we've just disconnected from the bus, do nothing since
1244 * a return here will re-run the queued command slot
1245 * that may have been interrupted by the initial selection */
1246 DEBUG((" SELECTION COMPLETED\n"));
1247 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1248 resume_offset = process_message(host, hostdata, SCp,
1250 } else if((dsps & 0xfffff000) == 0) {
1251 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1252 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1253 host->host_no, pun, lun, NCR_700_condition[i],
1254 NCR_700_phase[j], dsp - hostdata->pScript);
1256 struct scatterlist *sg;
1258 scsi_print_command(SCp);
1259 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1260 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, sg->length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1263 NCR_700_internal_bus_reset(host);
1264 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1265 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1266 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1267 resume_offset = dsp;
1269 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1270 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1271 NCR_700_internal_bus_reset(host);
1273 return resume_offset;
1276 /* We run the 53c700 with selection interrupts always enabled. This
1277 * means that the chip may be selected as soon as the bus frees. On a
1278 * busy bus, this can be before the scripts engine finishes its
1279 * processing. Therefore, part of the selection processing has to be
1280 * to find out what the scripts engine is doing and complete the
1281 * function if necessary (i.e. process the pending disconnect or save
1282 * the interrupted initial selection */
1284 process_selection(struct Scsi_Host *host, __u32 dsp)
1286 __u8 id = 0; /* Squash compiler warning */
1288 __u32 resume_offset = 0;
1289 struct NCR_700_Host_Parameters *hostdata =
1290 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1291 struct scsi_cmnd *SCp = hostdata->cmd;
1294 for(count = 0; count < 5; count++) {
1295 id = NCR_700_readb(host, hostdata->chip710 ?
1296 CTEST9_REG : SFBR_REG);
1298 /* Take out our own ID */
1299 id &= ~(1<<host->this_id);
1304 sbcl = NCR_700_readb(host, SBCL_REG);
1305 if((sbcl & SBCL_IO) == 0) {
1306 /* mark as having been selected rather than reselected */
1309 /* convert to real ID */
1310 hostdata->reselection_id = id = bitmap_to_number(id);
1311 DEBUG(("scsi%d: Reselected by %d\n",
1312 host->host_no, id));
1314 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1315 struct NCR_700_command_slot *slot =
1316 (struct NCR_700_command_slot *)SCp->host_scribble;
1317 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));
1319 switch(dsp - hostdata->pScript) {
1320 case Ent_Disconnect1:
1321 case Ent_Disconnect2:
1322 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1324 case Ent_Disconnect3:
1325 case Ent_Disconnect4:
1326 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1328 case Ent_Disconnect5:
1329 case Ent_Disconnect6:
1330 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1332 case Ent_Disconnect7:
1333 case Ent_Disconnect8:
1334 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1338 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1342 slot->state = NCR_700_SLOT_QUEUED;
1346 hostdata->state = NCR_700_HOST_BUSY;
1347 hostdata->cmd = NULL;
1348 /* clear any stale simple tag message */
1349 hostdata->msgin[1] = 0;
1350 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1354 /* Selected as target, Ignore */
1355 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1356 } else if(hostdata->tag_negotiated & (1<<id)) {
1357 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1359 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1361 return resume_offset;
1365 NCR_700_clear_fifo(struct Scsi_Host *host) {
1366 const struct NCR_700_Host_Parameters *hostdata
1367 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1368 if(hostdata->chip710) {
1369 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1371 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1376 NCR_700_flush_fifo(struct Scsi_Host *host) {
1377 const struct NCR_700_Host_Parameters *hostdata
1378 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1379 if(hostdata->chip710) {
1380 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1382 NCR_700_writeb(0, host, CTEST8_REG);
1384 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1386 NCR_700_writeb(0, host, DFIFO_REG);
1391 /* The queue lock with interrupts disabled must be held on entry to
1394 NCR_700_start_command(struct scsi_cmnd *SCp)
1396 struct NCR_700_command_slot *slot =
1397 (struct NCR_700_command_slot *)SCp->host_scribble;
1398 struct NCR_700_Host_Parameters *hostdata =
1399 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1400 __u16 count = 1; /* for IDENTIFY message */
1402 if(hostdata->state != NCR_700_HOST_FREE) {
1403 /* keep this inside the lock to close the race window where
1404 * the running command finishes on another CPU while we don't
1405 * change the state to queued on this one */
1406 slot->state = NCR_700_SLOT_QUEUED;
1408 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1409 SCp->device->host->host_no, slot->cmnd, slot));
1412 hostdata->state = NCR_700_HOST_BUSY;
1413 hostdata->cmd = SCp;
1414 slot->state = NCR_700_SLOT_BUSY;
1415 /* keep interrupts disabled until we have the command correctly
1416 * set up so we cannot take a selection interrupt */
1418 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1419 slot->flags != NCR_700_FLAG_AUTOSENSE),
1421 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1422 * if the negotiated transfer parameters still hold, so
1423 * always renegotiate them */
1424 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1425 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1426 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1429 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1430 * If a contingent allegiance condition exists, the device
1431 * will refuse all tags, so send the request sense as untagged
1433 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1434 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1435 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1436 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1439 if(hostdata->fast &&
1440 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1441 count += spi_populate_sync_msg(&hostdata->msgout[count],
1442 spi_period(SCp->device->sdev_target),
1443 spi_offset(SCp->device->sdev_target));
1444 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1447 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1450 script_patch_ID(hostdata->dev, hostdata->script,
1451 Device_ID, 1<<scmd_id(SCp));
1453 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1455 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1457 /* finally plumb the beginning of the SG list into the script
1459 script_patch_32_abs(hostdata->dev, hostdata->script,
1460 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1461 NCR_700_clear_fifo(SCp->device->host);
1463 if(slot->resume_offset == 0)
1464 slot->resume_offset = hostdata->pScript;
1465 /* now perform all the writebacks and invalidates */
1466 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1467 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1469 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1470 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1472 /* set the synchronous period/offset */
1473 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1474 SCp->device->host, SXFER_REG);
1475 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1476 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1482 NCR_700_intr(int irq, void *dev_id)
1484 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1485 struct NCR_700_Host_Parameters *hostdata =
1486 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1488 __u32 resume_offset = 0;
1489 __u8 pun = 0xff, lun = 0xff;
1490 unsigned long flags;
1493 /* Use the host lock to serialise acess to the 53c700
1494 * hardware. Note: In future, we may need to take the queue
1495 * lock to enter the done routines. When that happens, we
1496 * need to ensure that for this driver, the host lock and the
1497 * queue lock point to the same thing. */
1498 spin_lock_irqsave(host->host_lock, flags);
1499 if((istat = NCR_700_readb(host, ISTAT_REG))
1500 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1502 __u8 sstat0 = 0, dstat = 0;
1504 struct scsi_cmnd *SCp = hostdata->cmd;
1505 enum NCR_700_Host_State state;
1508 state = hostdata->state;
1509 SCp = hostdata->cmd;
1511 if(istat & SCSI_INT_PENDING) {
1514 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1517 if(istat & DMA_INT_PENDING) {
1520 dstat = NCR_700_readb(host, DSTAT_REG);
1523 dsps = NCR_700_readl(host, DSPS_REG);
1524 dsp = NCR_700_readl(host, DSP_REG);
1526 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1527 host->host_no, istat, sstat0, dstat,
1528 (dsp - (__u32)(hostdata->pScript))/4,
1532 pun = SCp->device->id;
1533 lun = SCp->device->lun;
1536 if(sstat0 & SCSI_RESET_DETECTED) {
1537 struct scsi_device *SDp;
1540 hostdata->state = NCR_700_HOST_BUSY;
1542 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1543 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1545 scsi_report_bus_reset(host, 0);
1547 /* clear all the negotiated parameters */
1548 __shost_for_each_device(SDp, host)
1549 NCR_700_clear_flag(SDp, ~0);
1551 /* clear all the slots and their pending commands */
1552 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1553 struct scsi_cmnd *SCp;
1554 struct NCR_700_command_slot *slot =
1555 &hostdata->slots[i];
1557 if(slot->state == NCR_700_SLOT_FREE)
1561 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1563 free_slot(slot, hostdata);
1564 SCp->host_scribble = NULL;
1565 NCR_700_set_depth(SCp->device, 0);
1566 /* NOTE: deadlock potential here: we
1567 * rely on mid-layer guarantees that
1568 * scsi_done won't try to issue the
1569 * command again otherwise we'll
1571 * hostdata->state_lock */
1572 SCp->result = DID_RESET << 16;
1573 SCp->scsi_done(SCp);
1576 NCR_700_chip_setup(host);
1578 hostdata->state = NCR_700_HOST_FREE;
1579 hostdata->cmd = NULL;
1580 /* signal back if this was an eh induced reset */
1581 if(hostdata->eh_complete != NULL)
1582 complete(hostdata->eh_complete);
1584 } else if(sstat0 & SELECTION_TIMEOUT) {
1585 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1586 host->host_no, pun, lun));
1587 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1588 } else if(sstat0 & PHASE_MISMATCH) {
1589 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1590 (struct NCR_700_command_slot *)SCp->host_scribble;
1592 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1593 /* It wants to reply to some part of
1595 #ifdef NCR_700_DEBUG
1596 __u32 temp = NCR_700_readl(host, TEMP_REG);
1597 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1598 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)));
1600 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1601 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1602 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1603 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1604 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1605 int residual = NCR_700_data_residual(host);
1607 #ifdef NCR_700_DEBUG
1608 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1610 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1611 host->host_no, pun, lun,
1612 SGcount, data_transfer);
1613 scsi_print_command(SCp);
1615 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1616 host->host_no, pun, lun,
1617 SGcount, data_transfer, residual);
1620 data_transfer += residual;
1622 if(data_transfer != 0) {
1628 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1629 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1630 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1631 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1632 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1633 pAddr += (count - data_transfer);
1634 #ifdef NCR_700_DEBUG
1635 if(pAddr != naddr) {
1636 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);
1639 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1641 /* set the executed moves to nops */
1642 for(i=0; i<SGcount; i++) {
1643 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1644 slot->SG[i].pAddr = 0;
1646 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1647 /* and pretend we disconnected after
1648 * the command phase */
1649 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1650 /* make sure all the data is flushed */
1651 NCR_700_flush_fifo(host);
1653 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1654 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1655 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1656 NCR_700_internal_bus_reset(host);
1659 } else if(sstat0 & SCSI_GROSS_ERROR) {
1660 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1661 host->host_no, pun, lun);
1662 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1663 } else if(sstat0 & PARITY_ERROR) {
1664 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1665 host->host_no, pun, lun);
1666 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1667 } else if(dstat & SCRIPT_INT_RECEIVED) {
1668 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1669 host->host_no, pun, lun));
1670 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1671 } else if(dstat & (ILGL_INST_DETECTED)) {
1672 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1673 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1674 host->host_no, pun, lun,
1675 dsp, dsp - hostdata->pScript);
1676 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1677 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1678 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1679 host->host_no, pun, lun, dstat);
1680 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1684 /* NOTE: selection interrupt processing MUST occur
1685 * after script interrupt processing to correctly cope
1686 * with the case where we process a disconnect and
1687 * then get reselected before we process the
1689 if(sstat0 & SELECTED) {
1690 /* FIXME: It currently takes at least FOUR
1691 * interrupts to complete a command that
1692 * disconnects: one for the disconnect, one
1693 * for the reselection, one to get the
1694 * reselection data and one to complete the
1695 * command. If we guess the reselected
1696 * command here and prepare it, we only need
1697 * to get a reselection data interrupt if we
1698 * guessed wrongly. Since the interrupt
1699 * overhead is much greater than the command
1700 * setup, this would be an efficient
1701 * optimisation particularly as we probably
1702 * only have one outstanding command on a
1703 * target most of the time */
1705 resume_offset = process_selection(host, dsp);
1712 if(hostdata->state != NCR_700_HOST_BUSY) {
1713 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1714 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1715 hostdata->state = NCR_700_HOST_BUSY;
1718 DEBUG(("Attempting to resume at %x\n", resume_offset));
1719 NCR_700_clear_fifo(host);
1720 NCR_700_writel(resume_offset, host, DSP_REG);
1722 /* There is probably a technical no-no about this: If we're a
1723 * shared interrupt and we got this interrupt because the
1724 * other device needs servicing not us, we're still going to
1725 * check our queued commands here---of course, there shouldn't
1726 * be any outstanding.... */
1727 if(hostdata->state == NCR_700_HOST_FREE) {
1730 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1731 /* fairness: always run the queue from the last
1732 * position we left off */
1733 int j = (i + hostdata->saved_slot_position)
1734 % NCR_700_COMMAND_SLOTS_PER_HOST;
1736 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1738 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1739 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1740 host->host_no, &hostdata->slots[j],
1741 hostdata->slots[j].cmnd));
1742 hostdata->saved_slot_position = j + 1;
1749 spin_unlock_irqrestore(host->host_lock, flags);
1750 return IRQ_RETVAL(handled);
1754 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1756 struct NCR_700_Host_Parameters *hostdata =
1757 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1759 enum dma_data_direction direction;
1760 struct NCR_700_command_slot *slot;
1762 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1763 /* We're over our allocation, this should never happen
1764 * since we report the max allocation to the mid layer */
1765 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1768 /* check for untagged commands. We cannot have any outstanding
1769 * commands if we accept them. Commands could be untagged because:
1771 * - The tag negotiated bitmap is clear
1772 * - The blk layer sent and untagged command
1774 if(NCR_700_get_depth(SCp->device) != 0
1775 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1776 || !blk_rq_tagged(SCp->request))) {
1777 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1778 NCR_700_get_depth(SCp->device));
1779 return SCSI_MLQUEUE_DEVICE_BUSY;
1781 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1782 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1783 NCR_700_get_depth(SCp->device));
1784 return SCSI_MLQUEUE_DEVICE_BUSY;
1786 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1788 /* begin the command here */
1789 /* no need to check for NULL, test for command_slot_count above
1790 * ensures a slot is free */
1791 slot = find_empty_slot(hostdata);
1795 SCp->scsi_done = done;
1796 SCp->host_scribble = (unsigned char *)slot;
1797 SCp->SCp.ptr = NULL;
1798 SCp->SCp.buffer = NULL;
1800 #ifdef NCR_700_DEBUG
1801 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1802 scsi_print_command(SCp);
1804 if(blk_rq_tagged(SCp->request)
1805 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1806 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1807 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1808 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1809 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1812 /* here we may have to process an untagged command. The gate
1813 * above ensures that this will be the only one outstanding,
1814 * so clear the tag negotiated bit.
1816 * FIXME: This will royally screw up on multiple LUN devices
1818 if(!blk_rq_tagged(SCp->request)
1819 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1820 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1821 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1824 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1825 && scsi_get_tag_type(SCp->device)) {
1826 slot->tag = SCp->request->tag;
1827 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1830 slot->tag = SCSI_NO_TAG;
1831 /* must populate current_cmnd for scsi_find_tag to work */
1832 SCp->device->current_cmnd = SCp;
1834 /* sanity check: some of the commands generated by the mid-layer
1835 * have an eccentric idea of their sc_data_direction */
1836 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1837 SCp->sc_data_direction != DMA_NONE) {
1838 #ifdef NCR_700_DEBUG
1839 printk("53c700: Command");
1840 scsi_print_command(SCp);
1841 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1843 SCp->sc_data_direction = DMA_NONE;
1846 switch (SCp->cmnd[0]) {
1848 /* clear the internal sense magic */
1852 /* OK, get it from the command */
1853 switch(SCp->sc_data_direction) {
1854 case DMA_BIDIRECTIONAL:
1856 printk(KERN_ERR "53c700: Unknown command for data direction ");
1857 scsi_print_command(SCp);
1864 case DMA_FROM_DEVICE:
1865 move_ins = SCRIPT_MOVE_DATA_IN;
1868 move_ins = SCRIPT_MOVE_DATA_OUT;
1873 /* now build the scatter gather list */
1874 direction = SCp->sc_data_direction;
1878 dma_addr_t vPtr = 0;
1879 struct scatterlist *sg;
1882 sg_count = scsi_dma_map(SCp);
1883 BUG_ON(sg_count < 0);
1885 scsi_for_each_sg(SCp, sg, sg_count, i) {
1886 vPtr = sg_dma_address(sg);
1887 count = sg_dma_len(sg);
1889 slot->SG[i].ins = bS_to_host(move_ins | count);
1890 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1891 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1892 slot->SG[i].pAddr = bS_to_host(vPtr);
1894 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1895 slot->SG[i].pAddr = 0;
1896 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1897 DEBUG((" SETTING %08lx to %x\n",
1898 (&slot->pSG[i].ins),
1901 slot->resume_offset = 0;
1902 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1903 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1904 NCR_700_start_command(SCp);
1909 NCR_700_abort(struct scsi_cmnd * SCp)
1911 struct NCR_700_command_slot *slot;
1913 scmd_printk(KERN_INFO, SCp,
1914 "New error handler wants to abort command\n\t");
1915 scsi_print_command(SCp);
1917 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1920 /* no outstanding command to abort */
1922 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1923 /* FIXME: This is because of a problem in the new
1924 * error handler. When it is in error recovery, it
1925 * will send a TUR to a device it thinks may still be
1926 * showing a problem. If the TUR isn't responded to,
1927 * it will abort it and mark the device off line.
1928 * Unfortunately, it does no other error recovery, so
1929 * this would leave us with an outstanding command
1930 * occupying a slot. Rather than allow this to
1931 * happen, we issue a bus reset to force all
1932 * outstanding commands to terminate here. */
1933 NCR_700_internal_bus_reset(SCp->device->host);
1934 /* still drop through and return failed */
1941 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1943 DECLARE_COMPLETION_ONSTACK(complete);
1944 struct NCR_700_Host_Parameters *hostdata =
1945 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1947 scmd_printk(KERN_INFO, SCp,
1948 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1949 scsi_print_command(SCp);
1951 /* In theory, eh_complete should always be null because the
1952 * eh is single threaded, but just in case we're handling a
1953 * reset via sg or something */
1954 spin_lock_irq(SCp->device->host->host_lock);
1955 while (hostdata->eh_complete != NULL) {
1956 spin_unlock_irq(SCp->device->host->host_lock);
1957 msleep_interruptible(100);
1958 spin_lock_irq(SCp->device->host->host_lock);
1961 hostdata->eh_complete = &complete;
1962 NCR_700_internal_bus_reset(SCp->device->host);
1964 spin_unlock_irq(SCp->device->host->host_lock);
1965 wait_for_completion(&complete);
1966 spin_lock_irq(SCp->device->host->host_lock);
1968 hostdata->eh_complete = NULL;
1969 /* Revalidate the transport parameters of the failing device */
1971 spi_schedule_dv_device(SCp->device);
1973 spin_unlock_irq(SCp->device->host->host_lock);
1978 NCR_700_host_reset(struct scsi_cmnd * SCp)
1980 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1981 scsi_print_command(SCp);
1983 spin_lock_irq(SCp->device->host->host_lock);
1985 NCR_700_internal_bus_reset(SCp->device->host);
1986 NCR_700_chip_reset(SCp->device->host);
1988 spin_unlock_irq(SCp->device->host->host_lock);
1994 NCR_700_set_period(struct scsi_target *STp, int period)
1996 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1997 struct NCR_700_Host_Parameters *hostdata =
1998 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2003 if(period < hostdata->min_period)
2004 period = hostdata->min_period;
2006 spi_period(STp) = period;
2007 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2008 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2009 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2013 NCR_700_set_offset(struct scsi_target *STp, int offset)
2015 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2016 struct NCR_700_Host_Parameters *hostdata =
2017 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2018 int max_offset = hostdata->chip710
2019 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2024 if(offset > max_offset)
2025 offset = max_offset;
2027 /* if we're currently async, make sure the period is reasonable */
2028 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2029 spi_period(STp) > 0xff))
2030 spi_period(STp) = hostdata->min_period;
2032 spi_offset(STp) = offset;
2033 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2034 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2035 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2039 NCR_700_slave_alloc(struct scsi_device *SDp)
2041 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2051 NCR_700_slave_configure(struct scsi_device *SDp)
2053 struct NCR_700_Host_Parameters *hostdata =
2054 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2056 /* to do here: allocate memory; build a queue_full list */
2057 if(SDp->tagged_supported) {
2058 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2059 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2060 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2062 /* initialise to default depth */
2063 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2065 if(hostdata->fast) {
2066 /* Find the correct offset and period via domain validation */
2067 if (!spi_initial_dv(SDp->sdev_target))
2070 spi_offset(SDp->sdev_target) = 0;
2071 spi_period(SDp->sdev_target) = 0;
2077 NCR_700_slave_destroy(struct scsi_device *SDp)
2079 kfree(SDp->hostdata);
2080 SDp->hostdata = NULL;
2084 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2086 if (depth > NCR_700_MAX_TAGS)
2087 depth = NCR_700_MAX_TAGS;
2089 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2093 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2095 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2096 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2097 struct NCR_700_Host_Parameters *hostdata =
2098 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2100 scsi_set_tag_type(SDp, tag_type);
2102 /* We have a global (per target) flag to track whether TCQ is
2103 * enabled, so we'll be turning it off for the entire target here.
2104 * our tag algorithm will fail if we mix tagged and untagged commands,
2105 * so quiesce the device before doing this */
2107 scsi_target_quiesce(SDp->sdev_target);
2110 /* shift back to the default unqueued number of commands
2111 * (the user can still raise this) */
2112 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2113 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2115 /* Here, we cleared the negotiation flag above, so this
2116 * will force the driver to renegotiate */
2117 scsi_activate_tcq(SDp, SDp->queue_depth);
2119 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2122 scsi_target_resume(SDp->sdev_target);
2128 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2130 struct scsi_device *SDp = to_scsi_device(dev);
2132 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
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_active_tags_attr,
2148 EXPORT_SYMBOL(NCR_700_detect);
2149 EXPORT_SYMBOL(NCR_700_release);
2150 EXPORT_SYMBOL(NCR_700_intr);
2152 static struct spi_function_template NCR_700_transport_functions = {
2153 .set_period = NCR_700_set_period,
2155 .set_offset = NCR_700_set_offset,
2159 static int __init NCR_700_init(void)
2161 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2162 if(!NCR_700_transport_template)
2167 static void __exit NCR_700_exit(void)
2169 spi_release_transport(NCR_700_transport_template);
2172 module_init(NCR_700_init);
2173 module_exit(NCR_700_exit);
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