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 MAX_COMMAND_SIZE, 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,
612 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
613 /* restore the old result if the request sense was
617 /* restore the original length */
618 SCp->cmd_len = cmnd[8];
620 NCR_700_unmap(hostdata, SCp, slot);
622 free_slot(slot, hostdata);
624 if(NCR_700_get_depth(SCp->device) == 0 ||
625 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
626 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
627 NCR_700_get_depth(SCp->device));
628 #endif /* NCR_700_DEBUG */
629 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
631 SCp->host_scribble = NULL;
632 SCp->result = result;
635 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
641 NCR_700_internal_bus_reset(struct Scsi_Host *host)
644 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
646 NCR_700_writeb(0, host, SCNTL1_REG);
651 NCR_700_chip_setup(struct Scsi_Host *host)
653 struct NCR_700_Host_Parameters *hostdata =
654 (struct NCR_700_Host_Parameters *)host->hostdata[0];
656 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
658 if(hostdata->chip710) {
659 __u8 burst_disable = 0;
660 __u8 burst_length = 0;
662 switch (hostdata->burst_length) {
664 burst_length = BURST_LENGTH_1;
667 burst_length = BURST_LENGTH_2;
670 burst_length = BURST_LENGTH_4;
673 burst_length = BURST_LENGTH_8;
676 burst_disable = BURST_DISABLE;
679 hostdata->dcntl_extra |= COMPAT_700_MODE;
681 NCR_700_writeb(hostdata->dcntl_extra, host, DCNTL_REG);
682 NCR_700_writeb(burst_length | hostdata->dmode_extra,
683 host, DMODE_710_REG);
684 NCR_700_writeb(burst_disable | hostdata->ctest7_extra |
685 (hostdata->differential ? DIFF : 0),
687 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
688 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
689 | AUTO_ATN, host, SCNTL0_REG);
691 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
692 host, DMODE_700_REG);
693 NCR_700_writeb(hostdata->differential ?
694 DIFF : 0, host, CTEST7_REG);
696 /* this is for 700-66, does nothing on 700 */
697 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
698 | GENERATE_RECEIVE_PARITY, host,
701 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
702 | PARITY | AUTO_ATN, host, SCNTL0_REG);
706 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
707 NCR_700_writeb(0, host, SBCL_REG);
708 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
710 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
711 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
713 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
714 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
715 if(hostdata->clock > 75) {
716 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
717 /* do the best we can, but the async clock will be out
718 * of spec: sync divider 2, async divider 3 */
719 DEBUG(("53c700: sync 2 async 3\n"));
720 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
721 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
722 hostdata->sync_clock = hostdata->clock/2;
723 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
724 /* sync divider 1.5, async divider 3 */
725 DEBUG(("53c700: sync 1.5 async 3\n"));
726 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
727 NCR_700_writeb(ASYNC_DIV_3_0 | hostdata->dcntl_extra, host, DCNTL_REG);
728 hostdata->sync_clock = hostdata->clock*2;
729 hostdata->sync_clock /= 3;
731 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
732 /* sync divider 1, async divider 2 */
733 DEBUG(("53c700: sync 1 async 2\n"));
734 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
735 NCR_700_writeb(ASYNC_DIV_2_0 | hostdata->dcntl_extra, host, DCNTL_REG);
736 hostdata->sync_clock = hostdata->clock;
737 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
738 /* sync divider 1, async divider 1.5 */
739 DEBUG(("53c700: sync 1 async 1.5\n"));
740 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
741 NCR_700_writeb(ASYNC_DIV_1_5 | hostdata->dcntl_extra, host, DCNTL_REG);
742 hostdata->sync_clock = hostdata->clock;
744 DEBUG(("53c700: sync 1 async 1\n"));
745 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
746 NCR_700_writeb(ASYNC_DIV_1_0 | hostdata->dcntl_extra, host, DCNTL_REG);
747 /* sync divider 1, async divider 1 */
748 hostdata->sync_clock = hostdata->clock;
750 /* Calculate the actual minimum period that can be supported
751 * by our synchronous clock speed. See the 710 manual for
752 * exact details of this calculation which is based on a
753 * setting of the SXFER register */
754 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
755 hostdata->min_period = NCR_700_MIN_PERIOD;
756 if(min_period > NCR_700_MIN_PERIOD)
757 hostdata->min_period = min_period;
761 NCR_700_chip_reset(struct Scsi_Host *host)
763 struct NCR_700_Host_Parameters *hostdata =
764 (struct NCR_700_Host_Parameters *)host->hostdata[0];
765 if(hostdata->chip710) {
766 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
769 NCR_700_writeb(0, host, ISTAT_REG);
771 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
774 NCR_700_writeb(0, host, DCNTL_REG);
779 NCR_700_chip_setup(host);
782 /* The heart of the message processing engine is that the instruction
783 * immediately after the INT is the normal case (and so must be CLEAR
784 * ACK). If we want to do something else, we call that routine in
785 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
786 * ACK) so that the routine returns correctly to resume its activity
789 process_extended_message(struct Scsi_Host *host,
790 struct NCR_700_Host_Parameters *hostdata,
791 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
793 __u32 resume_offset = dsp, temp = dsp + 8;
794 __u8 pun = 0xff, lun = 0xff;
797 pun = SCp->device->id;
798 lun = SCp->device->lun;
801 switch(hostdata->msgin[2]) {
803 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
804 struct scsi_target *starget = SCp->device->sdev_target;
805 __u8 period = hostdata->msgin[3];
806 __u8 offset = hostdata->msgin[4];
808 if(offset == 0 || period == 0) {
813 spi_offset(starget) = offset;
814 spi_period(starget) = period;
816 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
817 spi_display_xfer_agreement(starget);
818 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
821 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
822 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
824 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
828 /* SDTR message out of the blue, reject it */
829 shost_printk(KERN_WARNING, host,
830 "Unexpected SDTR msg\n");
831 hostdata->msgout[0] = A_REJECT_MSG;
832 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
833 script_patch_16(hostdata->dev, hostdata->script,
835 /* SendMsgOut returns, so set up the return
837 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
842 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
843 host->host_no, pun, lun);
844 hostdata->msgout[0] = A_REJECT_MSG;
845 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
846 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
848 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
853 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
854 host->host_no, pun, lun,
855 NCR_700_phase[(dsps & 0xf00) >> 8]);
856 spi_print_msg(hostdata->msgin);
859 hostdata->msgout[0] = A_REJECT_MSG;
860 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
861 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
863 /* SendMsgOut returns, so set up the return
865 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
867 NCR_700_writel(temp, host, TEMP_REG);
868 return resume_offset;
872 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
873 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
875 /* work out where to return to */
876 __u32 temp = dsp + 8, resume_offset = dsp;
877 __u8 pun = 0xff, lun = 0xff;
880 pun = SCp->device->id;
881 lun = SCp->device->lun;
885 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
886 NCR_700_phase[(dsps & 0xf00) >> 8]);
887 spi_print_msg(hostdata->msgin);
891 switch(hostdata->msgin[0]) {
894 resume_offset = process_extended_message(host, hostdata, SCp,
899 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
900 /* Rejected our sync negotiation attempt */
901 spi_period(SCp->device->sdev_target) =
902 spi_offset(SCp->device->sdev_target) = 0;
903 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
904 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
905 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
906 /* rejected our first simple tag message */
907 scmd_printk(KERN_WARNING, SCp,
908 "Rejected first tag queue attempt, turning off tag queueing\n");
909 /* we're done negotiating */
910 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
911 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
912 SCp->device->tagged_supported = 0;
913 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
915 shost_printk(KERN_WARNING, host,
916 "(%d:%d) Unexpected REJECT Message %s\n",
918 NCR_700_phase[(dsps & 0xf00) >> 8]);
919 /* however, just ignore it */
923 case A_PARITY_ERROR_MSG:
924 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
926 NCR_700_internal_bus_reset(host);
928 case A_SIMPLE_TAG_MSG:
929 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
930 pun, lun, hostdata->msgin[1],
931 NCR_700_phase[(dsps & 0xf00) >> 8]);
935 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
936 host->host_no, pun, lun,
937 NCR_700_phase[(dsps & 0xf00) >> 8]);
939 spi_print_msg(hostdata->msgin);
942 hostdata->msgout[0] = A_REJECT_MSG;
943 dma_cache_sync(hostdata->dev, hostdata->msgout, 1, DMA_TO_DEVICE);
944 script_patch_16(hostdata->dev, hostdata->script, MessageCount,
946 /* SendMsgOut returns, so set up the return
948 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
952 NCR_700_writel(temp, host, TEMP_REG);
953 /* set us up to receive another message */
954 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
955 return resume_offset;
959 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
960 struct Scsi_Host *host,
961 struct NCR_700_Host_Parameters *hostdata)
963 __u32 resume_offset = 0;
964 __u8 pun = 0xff, lun=0xff;
967 pun = SCp->device->id;
968 lun = SCp->device->lun;
971 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
972 DEBUG((" COMMAND COMPLETE, status=%02x\n",
973 hostdata->status[0]));
974 /* OK, if TCQ still under negotiation, we now know it works */
975 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
976 NCR_700_set_tag_neg_state(SCp->device,
977 NCR_700_FINISHED_TAG_NEGOTIATION);
979 /* check for contingent allegiance contitions */
980 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
981 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
982 struct NCR_700_command_slot *slot =
983 (struct NCR_700_command_slot *)SCp->host_scribble;
984 if(slot->flags == NCR_700_FLAG_AUTOSENSE) {
985 /* OOPS: bad device, returning another
986 * contingent allegiance condition */
987 scmd_printk(KERN_ERR, SCp,
988 "broken device is looping in contingent allegiance: ignoring\n");
989 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
992 NCR_700_get_sense_cmnd(SCp->device);
994 scsi_print_command(SCp);
995 printk(" cmd %p has status %d, requesting sense\n",
996 SCp, hostdata->status[0]);
998 /* we can destroy the command here
999 * because the contingent allegiance
1000 * condition will cause a retry which
1001 * will re-copy the command from the
1002 * saved data_cmnd. We also unmap any
1003 * data associated with the command
1005 NCR_700_unmap(hostdata, SCp, slot);
1006 dma_unmap_single(hostdata->dev, slot->pCmd,
1010 cmnd[0] = REQUEST_SENSE;
1011 cmnd[1] = (SCp->device->lun & 0x7) << 5;
1014 cmnd[4] = SCSI_SENSE_BUFFERSIZE;
1016 /* Here's a quiet hack: the
1017 * REQUEST_SENSE command is six bytes,
1018 * so store a flag indicating that
1019 * this was an internal sense request
1020 * and the original status at the end
1022 cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1023 cmnd[7] = hostdata->status[0];
1024 cmnd[8] = SCp->cmd_len;
1025 SCp->cmd_len = 6; /* command length for
1027 slot->pCmd = dma_map_single(hostdata->dev, cmnd, MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1028 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1029 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | SCSI_SENSE_BUFFERSIZE);
1030 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1031 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1032 slot->SG[1].pAddr = 0;
1033 slot->resume_offset = hostdata->pScript;
1034 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1035 dma_cache_sync(hostdata->dev, SCp->sense_buffer, SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
1037 /* queue the command for reissue */
1038 slot->state = NCR_700_SLOT_QUEUED;
1039 slot->flags = NCR_700_FLAG_AUTOSENSE;
1040 hostdata->state = NCR_700_HOST_FREE;
1041 hostdata->cmd = NULL;
1044 // Currently rely on the mid layer evaluation
1045 // of the tag queuing capability
1047 //if(status_byte(hostdata->status[0]) == GOOD &&
1048 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1049 // /* Piggy back the tag queueing support
1050 // * on this command */
1051 // dma_sync_single_for_cpu(hostdata->dev,
1052 // slot->dma_handle,
1053 // SCp->request_bufflen,
1054 // DMA_FROM_DEVICE);
1055 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1056 // scmd_printk(KERN_INFO, SCp,
1057 // "Enabling Tag Command Queuing\n");
1058 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1059 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1061 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1062 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1065 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1067 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1068 __u8 i = (dsps & 0xf00) >> 8;
1070 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1072 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1073 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1075 scsi_print_command(SCp);
1077 NCR_700_internal_bus_reset(host);
1078 } else if((dsps & 0xfffff000) == A_FATAL) {
1079 int i = (dsps & 0xfff);
1081 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1082 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1083 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1084 printk(KERN_ERR " msg begins %02x %02x\n",
1085 hostdata->msgin[0], hostdata->msgin[1]);
1087 NCR_700_internal_bus_reset(host);
1088 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1089 #ifdef NCR_700_DEBUG
1090 __u8 i = (dsps & 0xf00) >> 8;
1092 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1093 host->host_no, pun, lun,
1094 i, NCR_700_phase[i]);
1096 save_for_reselection(hostdata, SCp, dsp);
1098 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1100 struct NCR_700_command_slot *slot;
1101 __u8 reselection_id = hostdata->reselection_id;
1102 struct scsi_device *SDp;
1104 lun = hostdata->msgin[0] & 0x1f;
1106 hostdata->reselection_id = 0xff;
1107 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1108 host->host_no, reselection_id, lun));
1109 /* clear the reselection indicator */
1110 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1111 if(unlikely(SDp == NULL)) {
1112 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1113 host->host_no, reselection_id, lun);
1116 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1117 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1118 if(unlikely(SCp == NULL)) {
1119 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1120 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1124 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1125 DDEBUG(KERN_DEBUG, SDp,
1126 "reselection is tag %d, slot %p(%d)\n",
1127 hostdata->msgin[2], slot, slot->tag);
1129 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1130 if(unlikely(SCp == NULL)) {
1131 sdev_printk(KERN_ERR, SDp,
1132 "no saved request for untagged cmd\n");
1135 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1139 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1140 host->host_no, reselection_id, lun,
1141 hostdata->msgin[0], hostdata->msgin[1],
1142 hostdata->msgin[2]);
1144 if(hostdata->state != NCR_700_HOST_BUSY)
1145 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1147 resume_offset = slot->resume_offset;
1148 hostdata->cmd = slot->cmnd;
1150 /* re-patch for this command */
1151 script_patch_32_abs(hostdata->dev, hostdata->script,
1152 CommandAddress, slot->pCmd);
1153 script_patch_16(hostdata->dev, hostdata->script,
1154 CommandCount, slot->cmnd->cmd_len);
1155 script_patch_32_abs(hostdata->dev, hostdata->script,
1156 SGScriptStartAddress,
1157 to32bit(&slot->pSG[0].ins));
1159 /* Note: setting SXFER only works if we're
1160 * still in the MESSAGE phase, so it is vital
1161 * that ACK is still asserted when we process
1162 * the reselection message. The resume offset
1163 * should therefore always clear ACK */
1164 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1166 dma_cache_sync(hostdata->dev, hostdata->msgin,
1167 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1168 dma_cache_sync(hostdata->dev, hostdata->msgout,
1169 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1170 /* I'm just being paranoid here, the command should
1171 * already have been flushed from the cache */
1172 dma_cache_sync(hostdata->dev, slot->cmnd->cmnd,
1173 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1178 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1180 /* This section is full of debugging code because I've
1181 * never managed to reach it. I think what happens is
1182 * that, because the 700 runs with selection
1183 * interrupts enabled the whole time that we take a
1184 * selection interrupt before we manage to get to the
1185 * reselected script interrupt */
1187 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1188 struct NCR_700_command_slot *slot;
1190 /* Take out our own ID */
1191 reselection_id &= ~(1<<host->this_id);
1193 /* I've never seen this happen, so keep this as a printk rather
1195 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1196 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1199 /* FIXME: DEBUGGING CODE */
1200 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1203 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1204 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1205 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1208 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);
1209 SCp = hostdata->slots[i].cmnd;
1213 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1214 /* change slot from busy to queued to redo command */
1215 slot->state = NCR_700_SLOT_QUEUED;
1217 hostdata->cmd = NULL;
1219 if(reselection_id == 0) {
1220 if(hostdata->reselection_id == 0xff) {
1221 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1224 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1226 reselection_id = hostdata->reselection_id;
1230 /* convert to real ID */
1231 reselection_id = bitmap_to_number(reselection_id);
1233 hostdata->reselection_id = reselection_id;
1234 /* just in case we have a stale simple tag message, clear it */
1235 hostdata->msgin[1] = 0;
1236 dma_cache_sync(hostdata->dev, hostdata->msgin,
1237 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1238 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1239 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1241 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1243 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1244 /* we've just disconnected from the bus, do nothing since
1245 * a return here will re-run the queued command slot
1246 * that may have been interrupted by the initial selection */
1247 DEBUG((" SELECTION COMPLETED\n"));
1248 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1249 resume_offset = process_message(host, hostdata, SCp,
1251 } else if((dsps & 0xfffff000) == 0) {
1252 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1253 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1254 host->host_no, pun, lun, NCR_700_condition[i],
1255 NCR_700_phase[j], dsp - hostdata->pScript);
1257 struct scatterlist *sg;
1259 scsi_print_command(SCp);
1260 scsi_for_each_sg(SCp, sg, scsi_sg_count(SCp) + 1, i) {
1261 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);
1264 NCR_700_internal_bus_reset(host);
1265 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1266 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1267 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1268 resume_offset = dsp;
1270 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1271 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1272 NCR_700_internal_bus_reset(host);
1274 return resume_offset;
1277 /* We run the 53c700 with selection interrupts always enabled. This
1278 * means that the chip may be selected as soon as the bus frees. On a
1279 * busy bus, this can be before the scripts engine finishes its
1280 * processing. Therefore, part of the selection processing has to be
1281 * to find out what the scripts engine is doing and complete the
1282 * function if necessary (i.e. process the pending disconnect or save
1283 * the interrupted initial selection */
1285 process_selection(struct Scsi_Host *host, __u32 dsp)
1287 __u8 id = 0; /* Squash compiler warning */
1289 __u32 resume_offset = 0;
1290 struct NCR_700_Host_Parameters *hostdata =
1291 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1292 struct scsi_cmnd *SCp = hostdata->cmd;
1295 for(count = 0; count < 5; count++) {
1296 id = NCR_700_readb(host, hostdata->chip710 ?
1297 CTEST9_REG : SFBR_REG);
1299 /* Take out our own ID */
1300 id &= ~(1<<host->this_id);
1305 sbcl = NCR_700_readb(host, SBCL_REG);
1306 if((sbcl & SBCL_IO) == 0) {
1307 /* mark as having been selected rather than reselected */
1310 /* convert to real ID */
1311 hostdata->reselection_id = id = bitmap_to_number(id);
1312 DEBUG(("scsi%d: Reselected by %d\n",
1313 host->host_no, id));
1315 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1316 struct NCR_700_command_slot *slot =
1317 (struct NCR_700_command_slot *)SCp->host_scribble;
1318 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));
1320 switch(dsp - hostdata->pScript) {
1321 case Ent_Disconnect1:
1322 case Ent_Disconnect2:
1323 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1325 case Ent_Disconnect3:
1326 case Ent_Disconnect4:
1327 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1329 case Ent_Disconnect5:
1330 case Ent_Disconnect6:
1331 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1333 case Ent_Disconnect7:
1334 case Ent_Disconnect8:
1335 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1339 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1343 slot->state = NCR_700_SLOT_QUEUED;
1347 hostdata->state = NCR_700_HOST_BUSY;
1348 hostdata->cmd = NULL;
1349 /* clear any stale simple tag message */
1350 hostdata->msgin[1] = 0;
1351 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1355 /* Selected as target, Ignore */
1356 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1357 } else if(hostdata->tag_negotiated & (1<<id)) {
1358 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1360 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1362 return resume_offset;
1366 NCR_700_clear_fifo(struct Scsi_Host *host) {
1367 const struct NCR_700_Host_Parameters *hostdata
1368 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1369 if(hostdata->chip710) {
1370 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1372 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1377 NCR_700_flush_fifo(struct Scsi_Host *host) {
1378 const struct NCR_700_Host_Parameters *hostdata
1379 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1380 if(hostdata->chip710) {
1381 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1383 NCR_700_writeb(0, host, CTEST8_REG);
1385 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1387 NCR_700_writeb(0, host, DFIFO_REG);
1392 /* The queue lock with interrupts disabled must be held on entry to
1395 NCR_700_start_command(struct scsi_cmnd *SCp)
1397 struct NCR_700_command_slot *slot =
1398 (struct NCR_700_command_slot *)SCp->host_scribble;
1399 struct NCR_700_Host_Parameters *hostdata =
1400 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1401 __u16 count = 1; /* for IDENTIFY message */
1403 if(hostdata->state != NCR_700_HOST_FREE) {
1404 /* keep this inside the lock to close the race window where
1405 * the running command finishes on another CPU while we don't
1406 * change the state to queued on this one */
1407 slot->state = NCR_700_SLOT_QUEUED;
1409 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1410 SCp->device->host->host_no, slot->cmnd, slot));
1413 hostdata->state = NCR_700_HOST_BUSY;
1414 hostdata->cmd = SCp;
1415 slot->state = NCR_700_SLOT_BUSY;
1416 /* keep interrupts disabled until we have the command correctly
1417 * set up so we cannot take a selection interrupt */
1419 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1420 slot->flags != NCR_700_FLAG_AUTOSENSE),
1422 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1423 * if the negotiated transfer parameters still hold, so
1424 * always renegotiate them */
1425 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1426 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1427 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1430 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1431 * If a contingent allegiance condition exists, the device
1432 * will refuse all tags, so send the request sense as untagged
1434 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1435 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1436 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1437 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1440 if(hostdata->fast &&
1441 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1442 count += spi_populate_sync_msg(&hostdata->msgout[count],
1443 spi_period(SCp->device->sdev_target),
1444 spi_offset(SCp->device->sdev_target));
1445 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1448 script_patch_16(hostdata->dev, hostdata->script, MessageCount, count);
1451 script_patch_ID(hostdata->dev, hostdata->script,
1452 Device_ID, 1<<scmd_id(SCp));
1454 script_patch_32_abs(hostdata->dev, hostdata->script, CommandAddress,
1456 script_patch_16(hostdata->dev, hostdata->script, CommandCount,
1458 /* finally plumb the beginning of the SG list into the script
1460 script_patch_32_abs(hostdata->dev, hostdata->script,
1461 SGScriptStartAddress, to32bit(&slot->pSG[0].ins));
1462 NCR_700_clear_fifo(SCp->device->host);
1464 if(slot->resume_offset == 0)
1465 slot->resume_offset = hostdata->pScript;
1466 /* now perform all the writebacks and invalidates */
1467 dma_cache_sync(hostdata->dev, hostdata->msgout, count, DMA_TO_DEVICE);
1468 dma_cache_sync(hostdata->dev, hostdata->msgin, MSG_ARRAY_SIZE,
1470 dma_cache_sync(hostdata->dev, SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1471 dma_cache_sync(hostdata->dev, hostdata->status, 1, DMA_FROM_DEVICE);
1473 /* set the synchronous period/offset */
1474 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1475 SCp->device->host, SXFER_REG);
1476 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1477 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1483 NCR_700_intr(int irq, void *dev_id)
1485 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1486 struct NCR_700_Host_Parameters *hostdata =
1487 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1489 __u32 resume_offset = 0;
1490 __u8 pun = 0xff, lun = 0xff;
1491 unsigned long flags;
1494 /* Use the host lock to serialise acess to the 53c700
1495 * hardware. Note: In future, we may need to take the queue
1496 * lock to enter the done routines. When that happens, we
1497 * need to ensure that for this driver, the host lock and the
1498 * queue lock point to the same thing. */
1499 spin_lock_irqsave(host->host_lock, flags);
1500 if((istat = NCR_700_readb(host, ISTAT_REG))
1501 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1503 __u8 sstat0 = 0, dstat = 0;
1505 struct scsi_cmnd *SCp = hostdata->cmd;
1506 enum NCR_700_Host_State state;
1509 state = hostdata->state;
1510 SCp = hostdata->cmd;
1512 if(istat & SCSI_INT_PENDING) {
1515 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1518 if(istat & DMA_INT_PENDING) {
1521 dstat = NCR_700_readb(host, DSTAT_REG);
1524 dsps = NCR_700_readl(host, DSPS_REG);
1525 dsp = NCR_700_readl(host, DSP_REG);
1527 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1528 host->host_no, istat, sstat0, dstat,
1529 (dsp - (__u32)(hostdata->pScript))/4,
1533 pun = SCp->device->id;
1534 lun = SCp->device->lun;
1537 if(sstat0 & SCSI_RESET_DETECTED) {
1538 struct scsi_device *SDp;
1541 hostdata->state = NCR_700_HOST_BUSY;
1543 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1544 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1546 scsi_report_bus_reset(host, 0);
1548 /* clear all the negotiated parameters */
1549 __shost_for_each_device(SDp, host)
1550 NCR_700_clear_flag(SDp, ~0);
1552 /* clear all the slots and their pending commands */
1553 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1554 struct scsi_cmnd *SCp;
1555 struct NCR_700_command_slot *slot =
1556 &hostdata->slots[i];
1558 if(slot->state == NCR_700_SLOT_FREE)
1562 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1564 free_slot(slot, hostdata);
1565 SCp->host_scribble = NULL;
1566 NCR_700_set_depth(SCp->device, 0);
1567 /* NOTE: deadlock potential here: we
1568 * rely on mid-layer guarantees that
1569 * scsi_done won't try to issue the
1570 * command again otherwise we'll
1572 * hostdata->state_lock */
1573 SCp->result = DID_RESET << 16;
1574 SCp->scsi_done(SCp);
1577 NCR_700_chip_setup(host);
1579 hostdata->state = NCR_700_HOST_FREE;
1580 hostdata->cmd = NULL;
1581 /* signal back if this was an eh induced reset */
1582 if(hostdata->eh_complete != NULL)
1583 complete(hostdata->eh_complete);
1585 } else if(sstat0 & SELECTION_TIMEOUT) {
1586 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1587 host->host_no, pun, lun));
1588 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1589 } else if(sstat0 & PHASE_MISMATCH) {
1590 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1591 (struct NCR_700_command_slot *)SCp->host_scribble;
1593 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1594 /* It wants to reply to some part of
1596 #ifdef NCR_700_DEBUG
1597 __u32 temp = NCR_700_readl(host, TEMP_REG);
1598 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1599 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)));
1601 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1602 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1603 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1604 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1605 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1606 int residual = NCR_700_data_residual(host);
1608 #ifdef NCR_700_DEBUG
1609 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1611 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1612 host->host_no, pun, lun,
1613 SGcount, data_transfer);
1614 scsi_print_command(SCp);
1616 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1617 host->host_no, pun, lun,
1618 SGcount, data_transfer, residual);
1621 data_transfer += residual;
1623 if(data_transfer != 0) {
1629 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1630 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1631 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1632 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1633 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1634 pAddr += (count - data_transfer);
1635 #ifdef NCR_700_DEBUG
1636 if(pAddr != naddr) {
1637 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);
1640 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1642 /* set the executed moves to nops */
1643 for(i=0; i<SGcount; i++) {
1644 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1645 slot->SG[i].pAddr = 0;
1647 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1648 /* and pretend we disconnected after
1649 * the command phase */
1650 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1651 /* make sure all the data is flushed */
1652 NCR_700_flush_fifo(host);
1654 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1655 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1656 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1657 NCR_700_internal_bus_reset(host);
1660 } else if(sstat0 & SCSI_GROSS_ERROR) {
1661 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1662 host->host_no, pun, lun);
1663 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1664 } else if(sstat0 & PARITY_ERROR) {
1665 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1666 host->host_no, pun, lun);
1667 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1668 } else if(dstat & SCRIPT_INT_RECEIVED) {
1669 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1670 host->host_no, pun, lun));
1671 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1672 } else if(dstat & (ILGL_INST_DETECTED)) {
1673 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1674 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1675 host->host_no, pun, lun,
1676 dsp, dsp - hostdata->pScript);
1677 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1678 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1679 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1680 host->host_no, pun, lun, dstat);
1681 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1685 /* NOTE: selection interrupt processing MUST occur
1686 * after script interrupt processing to correctly cope
1687 * with the case where we process a disconnect and
1688 * then get reselected before we process the
1690 if(sstat0 & SELECTED) {
1691 /* FIXME: It currently takes at least FOUR
1692 * interrupts to complete a command that
1693 * disconnects: one for the disconnect, one
1694 * for the reselection, one to get the
1695 * reselection data and one to complete the
1696 * command. If we guess the reselected
1697 * command here and prepare it, we only need
1698 * to get a reselection data interrupt if we
1699 * guessed wrongly. Since the interrupt
1700 * overhead is much greater than the command
1701 * setup, this would be an efficient
1702 * optimisation particularly as we probably
1703 * only have one outstanding command on a
1704 * target most of the time */
1706 resume_offset = process_selection(host, dsp);
1713 if(hostdata->state != NCR_700_HOST_BUSY) {
1714 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1715 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1716 hostdata->state = NCR_700_HOST_BUSY;
1719 DEBUG(("Attempting to resume at %x\n", resume_offset));
1720 NCR_700_clear_fifo(host);
1721 NCR_700_writel(resume_offset, host, DSP_REG);
1723 /* There is probably a technical no-no about this: If we're a
1724 * shared interrupt and we got this interrupt because the
1725 * other device needs servicing not us, we're still going to
1726 * check our queued commands here---of course, there shouldn't
1727 * be any outstanding.... */
1728 if(hostdata->state == NCR_700_HOST_FREE) {
1731 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1732 /* fairness: always run the queue from the last
1733 * position we left off */
1734 int j = (i + hostdata->saved_slot_position)
1735 % NCR_700_COMMAND_SLOTS_PER_HOST;
1737 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1739 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1740 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1741 host->host_no, &hostdata->slots[j],
1742 hostdata->slots[j].cmnd));
1743 hostdata->saved_slot_position = j + 1;
1750 spin_unlock_irqrestore(host->host_lock, flags);
1751 return IRQ_RETVAL(handled);
1755 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1757 struct NCR_700_Host_Parameters *hostdata =
1758 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1760 enum dma_data_direction direction;
1761 struct NCR_700_command_slot *slot;
1763 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1764 /* We're over our allocation, this should never happen
1765 * since we report the max allocation to the mid layer */
1766 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1769 /* check for untagged commands. We cannot have any outstanding
1770 * commands if we accept them. Commands could be untagged because:
1772 * - The tag negotiated bitmap is clear
1773 * - The blk layer sent and untagged command
1775 if(NCR_700_get_depth(SCp->device) != 0
1776 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1777 || !blk_rq_tagged(SCp->request))) {
1778 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1779 NCR_700_get_depth(SCp->device));
1780 return SCSI_MLQUEUE_DEVICE_BUSY;
1782 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1783 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1784 NCR_700_get_depth(SCp->device));
1785 return SCSI_MLQUEUE_DEVICE_BUSY;
1787 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1789 /* begin the command here */
1790 /* no need to check for NULL, test for command_slot_count above
1791 * ensures a slot is free */
1792 slot = find_empty_slot(hostdata);
1796 SCp->scsi_done = done;
1797 SCp->host_scribble = (unsigned char *)slot;
1798 SCp->SCp.ptr = NULL;
1799 SCp->SCp.buffer = NULL;
1801 #ifdef NCR_700_DEBUG
1802 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1803 scsi_print_command(SCp);
1805 if(blk_rq_tagged(SCp->request)
1806 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1807 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1808 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1809 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1810 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1813 /* here we may have to process an untagged command. The gate
1814 * above ensures that this will be the only one outstanding,
1815 * so clear the tag negotiated bit.
1817 * FIXME: This will royally screw up on multiple LUN devices
1819 if(!blk_rq_tagged(SCp->request)
1820 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1821 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1822 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1825 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1826 && scsi_get_tag_type(SCp->device)) {
1827 slot->tag = SCp->request->tag;
1828 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1831 slot->tag = SCSI_NO_TAG;
1832 /* must populate current_cmnd for scsi_find_tag to work */
1833 SCp->device->current_cmnd = SCp;
1835 /* sanity check: some of the commands generated by the mid-layer
1836 * have an eccentric idea of their sc_data_direction */
1837 if(!scsi_sg_count(SCp) && !scsi_bufflen(SCp) &&
1838 SCp->sc_data_direction != DMA_NONE) {
1839 #ifdef NCR_700_DEBUG
1840 printk("53c700: Command");
1841 scsi_print_command(SCp);
1842 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1844 SCp->sc_data_direction = DMA_NONE;
1847 switch (SCp->cmnd[0]) {
1849 /* clear the internal sense magic */
1853 /* OK, get it from the command */
1854 switch(SCp->sc_data_direction) {
1855 case DMA_BIDIRECTIONAL:
1857 printk(KERN_ERR "53c700: Unknown command for data direction ");
1858 scsi_print_command(SCp);
1865 case DMA_FROM_DEVICE:
1866 move_ins = SCRIPT_MOVE_DATA_IN;
1869 move_ins = SCRIPT_MOVE_DATA_OUT;
1874 /* now build the scatter gather list */
1875 direction = SCp->sc_data_direction;
1879 dma_addr_t vPtr = 0;
1880 struct scatterlist *sg;
1883 sg_count = scsi_dma_map(SCp);
1884 BUG_ON(sg_count < 0);
1886 scsi_for_each_sg(SCp, sg, sg_count, i) {
1887 vPtr = sg_dma_address(sg);
1888 count = sg_dma_len(sg);
1890 slot->SG[i].ins = bS_to_host(move_ins | count);
1891 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1892 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1893 slot->SG[i].pAddr = bS_to_host(vPtr);
1895 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1896 slot->SG[i].pAddr = 0;
1897 dma_cache_sync(hostdata->dev, slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1898 DEBUG((" SETTING %08lx to %x\n",
1899 (&slot->pSG[i].ins),
1902 slot->resume_offset = 0;
1903 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1904 MAX_COMMAND_SIZE, DMA_TO_DEVICE);
1905 NCR_700_start_command(SCp);
1910 NCR_700_abort(struct scsi_cmnd * SCp)
1912 struct NCR_700_command_slot *slot;
1914 scmd_printk(KERN_INFO, SCp,
1915 "New error handler wants to abort command\n\t");
1916 scsi_print_command(SCp);
1918 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1921 /* no outstanding command to abort */
1923 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1924 /* FIXME: This is because of a problem in the new
1925 * error handler. When it is in error recovery, it
1926 * will send a TUR to a device it thinks may still be
1927 * showing a problem. If the TUR isn't responded to,
1928 * it will abort it and mark the device off line.
1929 * Unfortunately, it does no other error recovery, so
1930 * this would leave us with an outstanding command
1931 * occupying a slot. Rather than allow this to
1932 * happen, we issue a bus reset to force all
1933 * outstanding commands to terminate here. */
1934 NCR_700_internal_bus_reset(SCp->device->host);
1935 /* still drop through and return failed */
1942 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1944 DECLARE_COMPLETION_ONSTACK(complete);
1945 struct NCR_700_Host_Parameters *hostdata =
1946 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1948 scmd_printk(KERN_INFO, SCp,
1949 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1950 scsi_print_command(SCp);
1952 /* In theory, eh_complete should always be null because the
1953 * eh is single threaded, but just in case we're handling a
1954 * reset via sg or something */
1955 spin_lock_irq(SCp->device->host->host_lock);
1956 while (hostdata->eh_complete != NULL) {
1957 spin_unlock_irq(SCp->device->host->host_lock);
1958 msleep_interruptible(100);
1959 spin_lock_irq(SCp->device->host->host_lock);
1962 hostdata->eh_complete = &complete;
1963 NCR_700_internal_bus_reset(SCp->device->host);
1965 spin_unlock_irq(SCp->device->host->host_lock);
1966 wait_for_completion(&complete);
1967 spin_lock_irq(SCp->device->host->host_lock);
1969 hostdata->eh_complete = NULL;
1970 /* Revalidate the transport parameters of the failing device */
1972 spi_schedule_dv_device(SCp->device);
1974 spin_unlock_irq(SCp->device->host->host_lock);
1979 NCR_700_host_reset(struct scsi_cmnd * SCp)
1981 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1982 scsi_print_command(SCp);
1984 spin_lock_irq(SCp->device->host->host_lock);
1986 NCR_700_internal_bus_reset(SCp->device->host);
1987 NCR_700_chip_reset(SCp->device->host);
1989 spin_unlock_irq(SCp->device->host->host_lock);
1995 NCR_700_set_period(struct scsi_target *STp, int period)
1997 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1998 struct NCR_700_Host_Parameters *hostdata =
1999 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2004 if(period < hostdata->min_period)
2005 period = hostdata->min_period;
2007 spi_period(STp) = period;
2008 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2009 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2010 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2014 NCR_700_set_offset(struct scsi_target *STp, int offset)
2016 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2017 struct NCR_700_Host_Parameters *hostdata =
2018 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2019 int max_offset = hostdata->chip710
2020 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2025 if(offset > max_offset)
2026 offset = max_offset;
2028 /* if we're currently async, make sure the period is reasonable */
2029 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2030 spi_period(STp) > 0xff))
2031 spi_period(STp) = hostdata->min_period;
2033 spi_offset(STp) = offset;
2034 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2035 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2036 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2040 NCR_700_slave_alloc(struct scsi_device *SDp)
2042 SDp->hostdata = kzalloc(sizeof(struct NCR_700_Device_Parameters),
2052 NCR_700_slave_configure(struct scsi_device *SDp)
2054 struct NCR_700_Host_Parameters *hostdata =
2055 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2057 /* to do here: allocate memory; build a queue_full list */
2058 if(SDp->tagged_supported) {
2059 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2060 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2061 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2063 /* initialise to default depth */
2064 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2066 if(hostdata->fast) {
2067 /* Find the correct offset and period via domain validation */
2068 if (!spi_initial_dv(SDp->sdev_target))
2071 spi_offset(SDp->sdev_target) = 0;
2072 spi_period(SDp->sdev_target) = 0;
2078 NCR_700_slave_destroy(struct scsi_device *SDp)
2080 kfree(SDp->hostdata);
2081 SDp->hostdata = NULL;
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 << sdev_id(SDp));
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, struct device_attribute *attr, 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);
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