1 /* -*- mode: c; c-basic-offset: 8 -*- */
3 /* NCR (or Symbios) 53c700 and 53c700-66 Driver
5 * Copyright (C) 2001 by James.Bottomley@HansenPartnership.com
6 **-----------------------------------------------------------------------------
8 ** This program is free software; you can redistribute it and/or modify
9 ** it under the terms of the GNU General Public License as published by
10 ** the Free Software Foundation; either version 2 of the License, or
11 ** (at your option) any later version.
13 ** This program is distributed in the hope that it will be useful,
14 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ** GNU General Public License for more details.
18 ** You should have received a copy of the GNU General Public License
19 ** along with this program; if not, write to the Free Software
20 ** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 **-----------------------------------------------------------------------------
27 * This driver is designed exclusively for these chips (virtually the
28 * earliest of the scripts engine chips). They need their own drivers
29 * because they are missing so many of the scripts and snazzy register
30 * features of their elder brothers (the 710, 720 and 770).
32 * The 700 is the lowliest of the line, it can only do async SCSI.
33 * The 700-66 can at least do synchronous SCSI up to 10MHz.
35 * The 700 chip has no host bus interface logic of its own. However,
36 * it is usually mapped to a location with well defined register
37 * offsets. Therefore, if you can determine the base address and the
38 * irq your board incorporating this chip uses, you can probably use
39 * this driver to run it (although you'll probably have to write a
40 * minimal wrapper for the purpose---see the NCR_D700 driver for
41 * details about how to do this).
46 * 1. Better statistics in the proc fs
48 * 2. Implement message queue (queues SCSI messages like commands) and make
49 * the abort and device reset functions use them.
56 * Fixed bad bug affecting tag starvation processing (previously the
57 * driver would hang the system if too many tags starved. Also fixed
58 * bad bug having to do with 10 byte command processing and REQUEST
59 * SENSE (the command would loop forever getting a transfer length
60 * mismatch in the CMD phase).
64 * Fixed scripts problem which caused certain devices (notably CDRWs)
65 * to hang on initial INQUIRY. Updated NCR_700_readl/writel to use
66 * __raw_readl/writel for parisc compatibility (Thomas
67 * Bogendoerfer). Added missing SCp->request_bufflen initialisation
68 * for sense requests (Ryan Bradetich).
72 * Following test of the 64 bit parisc kernel by Richard Hirst,
73 * several problems have now been corrected. Also adds support for
74 * consistent memory allocation.
78 * More Compatibility changes for 710 (now actually works). Enhanced
79 * support for odd clock speeds which constrain SDTR negotiations.
80 * correct cacheline separation for scsi messages and status for
81 * incoherent architectures. Use of the pci mapping functions on
82 * buffers to begin support for 64 bit drivers.
86 * Added support for the 53c710 chip (in 53c700 emulation mode only---no
87 * special 53c710 instructions or registers are used).
91 * More endianness/cache coherency changes.
93 * Better bad device handling (handles devices lying about tag
94 * queueing support and devices which fail to provide sense data on
95 * contingent allegiance conditions)
97 * Many thanks to Richard Hirst <rhirst@linuxcare.com> for patiently
98 * debugging this driver on the parisc architecture and suggesting
99 * many improvements and bug fixes.
101 * Thanks also go to Linuxcare Inc. for providing several PARISC
102 * machines for me to debug the driver on.
106 * Made the driver mem or io mapped; added endian invariance; added
107 * dma cache flushing operations for architectures which need it;
108 * added support for more varied clocking speeds.
112 * Initial modularisation from the D700. See NCR_D700.c for the rest of
115 #define NCR_700_VERSION "2.8"
117 #include <linux/config.h>
118 #include <linux/kernel.h>
119 #include <linux/types.h>
120 #include <linux/string.h>
121 #include <linux/ioport.h>
122 #include <linux/delay.h>
123 #include <linux/spinlock.h>
124 #include <linux/completion.h>
125 #include <linux/sched.h>
126 #include <linux/init.h>
127 #include <linux/proc_fs.h>
128 #include <linux/blkdev.h>
129 #include <linux/module.h>
130 #include <linux/interrupt.h>
131 #include <linux/device.h>
133 #include <asm/system.h>
135 #include <asm/pgtable.h>
136 #include <asm/byteorder.h>
138 #include <scsi/scsi.h>
139 #include <scsi/scsi_cmnd.h>
140 #include <scsi/scsi_dbg.h>
141 #include <scsi/scsi_eh.h>
142 #include <scsi/scsi_host.h>
143 #include <scsi/scsi_tcq.h>
144 #include <scsi/scsi_transport.h>
145 #include <scsi/scsi_transport_spi.h>
149 /* NOTE: For 64 bit drivers there are points in the code where we use
150 * a non dereferenceable pointer to point to a structure in dma-able
151 * memory (which is 32 bits) so that we can use all of the structure
152 * operations but take the address at the end. This macro allows us
153 * to truncate the 64 bit pointer down to 32 bits without the compiler
155 #define to32bit(x) ((__u32)((unsigned long)(x)))
160 #define STATIC static
163 MODULE_AUTHOR("James Bottomley");
164 MODULE_DESCRIPTION("53c700 and 53c700-66 Driver");
165 MODULE_LICENSE("GPL");
167 /* This is the script */
168 #include "53c700_d.h"
171 STATIC int NCR_700_queuecommand(struct scsi_cmnd *, void (*done)(struct scsi_cmnd *));
172 STATIC int NCR_700_abort(struct scsi_cmnd * SCpnt);
173 STATIC int NCR_700_bus_reset(struct scsi_cmnd * SCpnt);
174 STATIC int NCR_700_host_reset(struct scsi_cmnd * SCpnt);
175 STATIC void NCR_700_chip_setup(struct Scsi_Host *host);
176 STATIC void NCR_700_chip_reset(struct Scsi_Host *host);
177 STATIC int NCR_700_slave_configure(struct scsi_device *SDpnt);
178 STATIC void NCR_700_slave_destroy(struct scsi_device *SDpnt);
179 static int NCR_700_change_queue_depth(struct scsi_device *SDpnt, int depth);
180 static int NCR_700_change_queue_type(struct scsi_device *SDpnt, int depth);
182 STATIC struct device_attribute *NCR_700_dev_attrs[];
184 STATIC struct scsi_transport_template *NCR_700_transport_template = NULL;
186 struct NCR_700_sense {
187 unsigned char cmnd[MAX_COMMAND_SIZE];
190 static char *NCR_700_phase[] = {
193 "before command phase",
194 "after command phase",
195 "after status phase",
196 "after data in phase",
197 "after data out phase",
201 static char *NCR_700_condition[] = {
209 "REJECT_MSG RECEIVED",
210 "DISCONNECT_MSG RECEIVED",
216 static char *NCR_700_fatal_messages[] = {
217 "unexpected message after reselection",
218 "still MSG_OUT after message injection",
219 "not MSG_IN after selection",
220 "Illegal message length received",
223 static char *NCR_700_SBCL_bits[] = {
234 static char *NCR_700_SBCL_to_phase[] = {
245 /* This translates the SDTR message offset and period to a value
246 * which can be loaded into the SXFER_REG.
248 * NOTE: According to SCSI-2, the true transfer period (in ns) is
249 * actually four times this period value */
251 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
252 __u8 offset, __u8 period)
256 __u8 min_xferp = (hostdata->chip710
257 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
258 __u8 max_offset = (hostdata->chip710
259 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
264 if(period < hostdata->min_period) {
265 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
266 period = hostdata->min_period;
268 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
269 if(offset > max_offset) {
270 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
274 if(XFERP < min_xferp) {
275 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
279 return (offset & 0x0f) | (XFERP & 0x07)<<4;
283 NCR_700_get_SXFER(struct scsi_device *SDp)
285 struct NCR_700_Host_Parameters *hostdata =
286 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
288 return NCR_700_offset_period_to_sxfer(hostdata,
289 spi_offset(SDp->sdev_target),
290 spi_period(SDp->sdev_target));
294 NCR_700_detect(struct scsi_host_template *tpnt,
295 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
297 dma_addr_t pScript, pSlots;
300 struct Scsi_Host *host;
301 static int banner = 0;
304 if(tpnt->sdev_attrs == NULL)
305 tpnt->sdev_attrs = NCR_700_dev_attrs;
307 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
308 &pScript, GFP_KERNEL);
310 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
314 script = (__u32 *)memory;
315 hostdata->msgin = memory + MSGIN_OFFSET;
316 hostdata->msgout = memory + MSGOUT_OFFSET;
317 hostdata->status = memory + STATUS_OFFSET;
318 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
319 * if this isn't sufficient separation to avoid dma flushing issues */
320 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
321 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
324 pSlots = pScript + SLOTS_OFFSET;
326 /* Fill in the missing routines from the host template */
327 tpnt->queuecommand = NCR_700_queuecommand;
328 tpnt->eh_abort_handler = NCR_700_abort;
329 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
330 tpnt->eh_host_reset_handler = NCR_700_host_reset;
331 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
332 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
333 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
334 tpnt->use_clustering = ENABLE_CLUSTERING;
335 tpnt->slave_configure = NCR_700_slave_configure;
336 tpnt->slave_destroy = NCR_700_slave_destroy;
337 tpnt->change_queue_depth = NCR_700_change_queue_depth;
338 tpnt->change_queue_type = NCR_700_change_queue_type;
340 if(tpnt->name == NULL)
341 tpnt->name = "53c700";
342 if(tpnt->proc_name == NULL)
343 tpnt->proc_name = "53c700";
345 host = scsi_host_alloc(tpnt, 4);
348 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
349 * NCR_700_COMMAND_SLOTS_PER_HOST);
350 for (j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
351 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
352 - (unsigned long)&hostdata->slots[0].SG[0]);
353 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
355 hostdata->free_list = &hostdata->slots[j];
357 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
358 hostdata->slots[j].state = NCR_700_SLOT_FREE;
361 for (j = 0; j < ARRAY_SIZE(SCRIPT); j++)
362 script[j] = bS_to_host(SCRIPT[j]);
364 /* adjust all labels to be bus physical */
365 for (j = 0; j < PATCHES; j++)
366 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
367 /* now patch up fixed addresses. */
368 script_patch_32(script, MessageLocation,
369 pScript + MSGOUT_OFFSET);
370 script_patch_32(script, StatusAddress,
371 pScript + STATUS_OFFSET);
372 script_patch_32(script, ReceiveMsgAddress,
373 pScript + MSGIN_OFFSET);
375 hostdata->script = script;
376 hostdata->pScript = pScript;
377 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
378 hostdata->state = NCR_700_HOST_FREE;
379 hostdata->cmd = NULL;
381 host->max_lun = NCR_700_MAX_LUNS;
382 BUG_ON(NCR_700_transport_template == NULL);
383 host->transportt = NCR_700_transport_template;
384 host->unique_id = (unsigned long)hostdata->base;
385 hostdata->eh_complete = NULL;
386 host->hostdata[0] = (unsigned long)hostdata;
388 NCR_700_writeb(0xff, host, CTEST9_REG);
389 if (hostdata->chip710)
390 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
392 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
393 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
395 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
398 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
399 hostdata->chip710 ? "53c710" :
400 (hostdata->fast ? "53c700-66" : "53c700"),
401 hostdata->rev, hostdata->differential ?
402 "(Differential)" : "");
404 NCR_700_chip_reset(host);
406 if (scsi_add_host(host, dev)) {
407 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
412 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
419 NCR_700_release(struct Scsi_Host *host)
421 struct NCR_700_Host_Parameters *hostdata =
422 (struct NCR_700_Host_Parameters *)host->hostdata[0];
424 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
425 hostdata->script, hostdata->pScript);
430 NCR_700_identify(int can_disconnect, __u8 lun)
432 return IDENTIFY_BASE |
433 ((can_disconnect) ? 0x40 : 0) |
434 (lun & NCR_700_LUN_MASK);
438 * Function : static int data_residual (Scsi_Host *host)
440 * Purpose : return residual data count of what's in the chip. If you
441 * really want to know what this function is doing, it's almost a
442 * direct transcription of the algorithm described in the 53c710
443 * guide, except that the DBC and DFIFO registers are only 6 bits
446 * Inputs : host - SCSI host */
448 NCR_700_data_residual (struct Scsi_Host *host) {
449 struct NCR_700_Host_Parameters *hostdata =
450 (struct NCR_700_Host_Parameters *)host->hostdata[0];
451 int count, synchronous = 0;
454 if(hostdata->chip710) {
455 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
456 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
458 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
459 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
463 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
465 /* get the data direction */
466 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
471 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
473 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
477 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
478 if (sstat & SODL_REG_FULL)
480 if (synchronous && (sstat & SODR_REG_FULL))
485 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
490 /* print out the SCSI wires and corresponding phase from the SBCL register
493 sbcl_to_string(__u8 sbcl)
496 static char ret[256];
501 strcat(ret, NCR_700_SBCL_bits[i]);
503 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
508 bitmap_to_number(__u8 bitmap)
512 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
517 /* Pull a slot off the free list */
518 STATIC struct NCR_700_command_slot *
519 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
521 struct NCR_700_command_slot *slot = hostdata->free_list;
525 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
526 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
530 if(slot->state != NCR_700_SLOT_FREE)
532 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
535 hostdata->free_list = slot->ITL_forw;
536 slot->ITL_forw = NULL;
539 /* NOTE: set the state to busy here, not queued, since this
540 * indicates the slot is in use and cannot be run by the IRQ
541 * finish routine. If we cannot queue the command when it
542 * is properly build, we then change to NCR_700_SLOT_QUEUED */
543 slot->state = NCR_700_SLOT_BUSY;
545 hostdata->command_slot_count++;
551 free_slot(struct NCR_700_command_slot *slot,
552 struct NCR_700_Host_Parameters *hostdata)
554 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
555 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
557 if(slot->state == NCR_700_SLOT_FREE) {
558 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
561 slot->resume_offset = 0;
563 slot->state = NCR_700_SLOT_FREE;
564 slot->ITL_forw = hostdata->free_list;
565 hostdata->free_list = slot;
566 hostdata->command_slot_count--;
570 /* This routine really does very little. The command is indexed on
571 the ITL and (if tagged) the ITLQ lists in _queuecommand */
573 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
574 struct scsi_cmnd *SCp, __u32 dsp)
576 /* Its just possible that this gets executed twice */
578 struct NCR_700_command_slot *slot =
579 (struct NCR_700_command_slot *)SCp->host_scribble;
581 slot->resume_offset = dsp;
583 hostdata->state = NCR_700_HOST_FREE;
584 hostdata->cmd = NULL;
588 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
589 struct NCR_700_command_slot *slot)
591 if(SCp->sc_data_direction != DMA_NONE &&
592 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
594 dma_unmap_sg(hostdata->dev, SCp->request_buffer,
595 SCp->use_sg, SCp->sc_data_direction);
597 dma_unmap_single(hostdata->dev, slot->dma_handle,
598 SCp->request_bufflen,
599 SCp->sc_data_direction);
605 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
606 struct scsi_cmnd *SCp, int result)
608 hostdata->state = NCR_700_HOST_FREE;
609 hostdata->cmd = NULL;
612 struct NCR_700_command_slot *slot =
613 (struct NCR_700_command_slot *)SCp->host_scribble;
615 NCR_700_unmap(hostdata, SCp, slot);
616 if (slot->flags == NCR_700_FLAG_AUTOSENSE) {
617 struct NCR_700_sense *sense = SCp->device->hostdata;
619 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
620 SCp, SCp->cmnd[7], result);
621 scsi_print_sense("53c700", SCp);
624 dma_unmap_single(hostdata->dev, slot->dma_handle, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
625 /* restore the old result if the request sense was
628 result = sense->cmnd[7];
630 dma_unmap_single(hostdata->dev, slot->pCmd,
631 sizeof(SCp->cmnd), DMA_TO_DEVICE);
633 free_slot(slot, hostdata);
635 if(NCR_700_get_depth(SCp->device) == 0 ||
636 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
637 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
638 NCR_700_get_depth(SCp->device));
639 #endif /* NCR_700_DEBUG */
640 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
642 SCp->host_scribble = NULL;
643 SCp->result = result;
646 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
652 NCR_700_internal_bus_reset(struct Scsi_Host *host)
655 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
657 NCR_700_writeb(0, host, SCNTL1_REG);
662 NCR_700_chip_setup(struct Scsi_Host *host)
664 struct NCR_700_Host_Parameters *hostdata =
665 (struct NCR_700_Host_Parameters *)host->hostdata[0];
666 __u32 dcntl_extra = 0;
668 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
670 if(hostdata->chip710) {
671 __u8 burst_disable = hostdata->burst_disable
673 dcntl_extra = COMPAT_700_MODE;
675 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
676 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
677 host, DMODE_710_REG);
678 NCR_700_writeb(burst_disable | (hostdata->differential ?
679 DIFF : 0), host, CTEST7_REG);
680 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
681 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
682 | AUTO_ATN, host, SCNTL0_REG);
684 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
685 host, DMODE_700_REG);
686 NCR_700_writeb(hostdata->differential ?
687 DIFF : 0, host, CTEST7_REG);
689 /* this is for 700-66, does nothing on 700 */
690 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
691 | GENERATE_RECEIVE_PARITY, host,
694 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
695 | PARITY | AUTO_ATN, host, SCNTL0_REG);
699 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
700 NCR_700_writeb(0, host, SBCL_REG);
701 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
703 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
704 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
706 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
707 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
708 if(hostdata->clock > 75) {
709 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
710 /* do the best we can, but the async clock will be out
711 * of spec: sync divider 2, async divider 3 */
712 DEBUG(("53c700: sync 2 async 3\n"));
713 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
714 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
715 hostdata->sync_clock = hostdata->clock/2;
716 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
717 /* sync divider 1.5, async divider 3 */
718 DEBUG(("53c700: sync 1.5 async 3\n"));
719 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
720 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
721 hostdata->sync_clock = hostdata->clock*2;
722 hostdata->sync_clock /= 3;
724 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
725 /* sync divider 1, async divider 2 */
726 DEBUG(("53c700: sync 1 async 2\n"));
727 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
728 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
729 hostdata->sync_clock = hostdata->clock;
730 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
731 /* sync divider 1, async divider 1.5 */
732 DEBUG(("53c700: sync 1 async 1.5\n"));
733 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
734 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
735 hostdata->sync_clock = hostdata->clock;
737 DEBUG(("53c700: sync 1 async 1\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
740 /* sync divider 1, async divider 1 */
741 hostdata->sync_clock = hostdata->clock;
743 /* Calculate the actual minimum period that can be supported
744 * by our synchronous clock speed. See the 710 manual for
745 * exact details of this calculation which is based on a
746 * setting of the SXFER register */
747 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
748 hostdata->min_period = NCR_700_MIN_PERIOD;
749 if(min_period > NCR_700_MIN_PERIOD)
750 hostdata->min_period = min_period;
754 NCR_700_chip_reset(struct Scsi_Host *host)
756 struct NCR_700_Host_Parameters *hostdata =
757 (struct NCR_700_Host_Parameters *)host->hostdata[0];
758 if(hostdata->chip710) {
759 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
762 NCR_700_writeb(0, host, ISTAT_REG);
764 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
767 NCR_700_writeb(0, host, DCNTL_REG);
772 NCR_700_chip_setup(host);
775 /* The heart of the message processing engine is that the instruction
776 * immediately after the INT is the normal case (and so must be CLEAR
777 * ACK). If we want to do something else, we call that routine in
778 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
779 * ACK) so that the routine returns correctly to resume its activity
782 process_extended_message(struct Scsi_Host *host,
783 struct NCR_700_Host_Parameters *hostdata,
784 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
786 __u32 resume_offset = dsp, temp = dsp + 8;
787 __u8 pun = 0xff, lun = 0xff;
790 pun = SCp->device->id;
791 lun = SCp->device->lun;
794 switch(hostdata->msgin[2]) {
796 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
797 struct scsi_target *starget = SCp->device->sdev_target;
798 __u8 period = hostdata->msgin[3];
799 __u8 offset = hostdata->msgin[4];
801 if(offset == 0 || period == 0) {
806 spi_offset(starget) = offset;
807 spi_period(starget) = period;
809 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
810 spi_display_xfer_agreement(starget);
811 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
814 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
815 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
817 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
821 /* SDTR message out of the blue, reject it */
822 shost_printk(KERN_WARNING, host,
823 "Unexpected SDTR msg\n");
824 hostdata->msgout[0] = A_REJECT_MSG;
825 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
826 script_patch_16(hostdata->script, MessageCount, 1);
827 /* SendMsgOut returns, so set up the return
829 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
834 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
835 host->host_no, pun, lun);
836 hostdata->msgout[0] = A_REJECT_MSG;
837 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
838 script_patch_16(hostdata->script, MessageCount, 1);
839 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
844 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
845 host->host_no, pun, lun,
846 NCR_700_phase[(dsps & 0xf00) >> 8]);
847 spi_print_msg(hostdata->msgin);
850 hostdata->msgout[0] = A_REJECT_MSG;
851 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
852 script_patch_16(hostdata->script, MessageCount, 1);
853 /* SendMsgOut returns, so set up the return
855 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
857 NCR_700_writel(temp, host, TEMP_REG);
858 return resume_offset;
862 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
863 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
865 /* work out where to return to */
866 __u32 temp = dsp + 8, resume_offset = dsp;
867 __u8 pun = 0xff, lun = 0xff;
870 pun = SCp->device->id;
871 lun = SCp->device->lun;
875 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
876 NCR_700_phase[(dsps & 0xf00) >> 8]);
877 spi_print_msg(hostdata->msgin);
881 switch(hostdata->msgin[0]) {
884 resume_offset = process_extended_message(host, hostdata, SCp,
889 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
890 /* Rejected our sync negotiation attempt */
891 spi_period(SCp->device->sdev_target) =
892 spi_offset(SCp->device->sdev_target) = 0;
893 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
894 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
895 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
896 /* rejected our first simple tag message */
897 scmd_printk(KERN_WARNING, SCp,
898 "Rejected first tag queue attempt, turning off tag queueing\n");
899 /* we're done negotiating */
900 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
901 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
902 SCp->device->tagged_supported = 0;
903 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
905 shost_printk(KERN_WARNING, host,
906 "(%d:%d) Unexpected REJECT Message %s\n",
908 NCR_700_phase[(dsps & 0xf00) >> 8]);
909 /* however, just ignore it */
913 case A_PARITY_ERROR_MSG:
914 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
916 NCR_700_internal_bus_reset(host);
918 case A_SIMPLE_TAG_MSG:
919 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
920 pun, lun, hostdata->msgin[1],
921 NCR_700_phase[(dsps & 0xf00) >> 8]);
925 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
926 host->host_no, pun, lun,
927 NCR_700_phase[(dsps & 0xf00) >> 8]);
929 spi_print_msg(hostdata->msgin);
932 hostdata->msgout[0] = A_REJECT_MSG;
933 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
934 script_patch_16(hostdata->script, MessageCount, 1);
935 /* SendMsgOut returns, so set up the return
937 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
941 NCR_700_writel(temp, host, TEMP_REG);
942 /* set us up to receive another message */
943 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
944 return resume_offset;
948 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
949 struct Scsi_Host *host,
950 struct NCR_700_Host_Parameters *hostdata)
952 __u32 resume_offset = 0;
953 __u8 pun = 0xff, lun=0xff;
956 pun = SCp->device->id;
957 lun = SCp->device->lun;
960 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
961 DEBUG((" COMMAND COMPLETE, status=%02x\n",
962 hostdata->status[0]));
963 /* OK, if TCQ still under negotiation, we now know it works */
964 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
965 NCR_700_set_tag_neg_state(SCp->device,
966 NCR_700_FINISHED_TAG_NEGOTIATION);
968 /* check for contingent allegiance contitions */
969 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
970 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
971 struct NCR_700_command_slot *slot =
972 (struct NCR_700_command_slot *)SCp->host_scribble;
973 if(SCp->cmnd[0] == REQUEST_SENSE) {
974 /* OOPS: bad device, returning another
975 * contingent allegiance condition */
976 scmd_printk(KERN_ERR, SCp,
977 "broken device is looping in contingent allegiance: ignoring\n");
978 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
980 struct NCR_700_sense *sense = SCp->device->hostdata;
982 scsi_print_command(SCp);
983 printk(" cmd %p has status %d, requesting sense\n",
984 SCp, hostdata->status[0]);
986 /* we can destroy the command here
987 * because the contingent allegiance
988 * condition will cause a retry which
989 * will re-copy the command from the
990 * saved data_cmnd. We also unmap any
991 * data associated with the command
993 NCR_700_unmap(hostdata, SCp, slot);
994 dma_unmap_single(hostdata->dev, slot->pCmd,
998 sense->cmnd[0] = REQUEST_SENSE;
999 sense->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1002 sense->cmnd[4] = sizeof(SCp->sense_buffer);
1004 /* Here's a quiet hack: the
1005 * REQUEST_SENSE command is six bytes,
1006 * so store a flag indicating that
1007 * this was an internal sense request
1008 * and the original status at the end
1010 sense->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1011 sense->cmnd[7] = hostdata->status[0];
1012 slot->pCmd = dma_map_single(hostdata->dev, sense->cmnd, sizeof(sense->cmnd), DMA_TO_DEVICE);
1013 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1014 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1015 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1016 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1017 slot->SG[1].pAddr = 0;
1018 slot->resume_offset = hostdata->pScript;
1019 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1020 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1022 /* queue the command for reissue */
1023 slot->state = NCR_700_SLOT_QUEUED;
1024 slot->flags = NCR_700_FLAG_AUTOSENSE;
1025 hostdata->state = NCR_700_HOST_FREE;
1026 hostdata->cmd = NULL;
1029 // Currently rely on the mid layer evaluation
1030 // of the tag queuing capability
1032 //if(status_byte(hostdata->status[0]) == GOOD &&
1033 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1034 // /* Piggy back the tag queueing support
1035 // * on this command */
1036 // dma_sync_single_for_cpu(hostdata->dev,
1037 // slot->dma_handle,
1038 // SCp->request_bufflen,
1039 // DMA_FROM_DEVICE);
1040 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1041 // scmd_printk(KERN_INFO, SCp,
1042 // "Enabling Tag Command Queuing\n");
1043 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1044 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1046 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1047 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1050 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1052 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1053 __u8 i = (dsps & 0xf00) >> 8;
1055 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1057 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1058 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1060 scsi_print_command(SCp);
1062 NCR_700_internal_bus_reset(host);
1063 } else if((dsps & 0xfffff000) == A_FATAL) {
1064 int i = (dsps & 0xfff);
1066 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1067 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1068 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1069 printk(KERN_ERR " msg begins %02x %02x\n",
1070 hostdata->msgin[0], hostdata->msgin[1]);
1072 NCR_700_internal_bus_reset(host);
1073 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1074 #ifdef NCR_700_DEBUG
1075 __u8 i = (dsps & 0xf00) >> 8;
1077 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1078 host->host_no, pun, lun,
1079 i, NCR_700_phase[i]);
1081 save_for_reselection(hostdata, SCp, dsp);
1083 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1085 struct NCR_700_command_slot *slot;
1086 __u8 reselection_id = hostdata->reselection_id;
1087 struct scsi_device *SDp;
1089 lun = hostdata->msgin[0] & 0x1f;
1091 hostdata->reselection_id = 0xff;
1092 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1093 host->host_no, reselection_id, lun));
1094 /* clear the reselection indicator */
1095 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1096 if(unlikely(SDp == NULL)) {
1097 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1098 host->host_no, reselection_id, lun);
1101 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1102 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1103 if(unlikely(SCp == NULL)) {
1104 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1105 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1109 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1110 DDEBUG(KERN_DEBUG, SDp,
1111 "reselection is tag %d, slot %p(%d)\n",
1112 hostdata->msgin[2], slot, slot->tag);
1114 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1115 if(unlikely(SCp == NULL)) {
1116 sdev_printk(KERN_ERR, SDp,
1117 "no saved request for untagged cmd\n");
1120 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1124 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1125 host->host_no, reselection_id, lun,
1126 hostdata->msgin[0], hostdata->msgin[1],
1127 hostdata->msgin[2]);
1129 if(hostdata->state != NCR_700_HOST_BUSY)
1130 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1132 resume_offset = slot->resume_offset;
1133 hostdata->cmd = slot->cmnd;
1135 /* re-patch for this command */
1136 script_patch_32_abs(hostdata->script, CommandAddress,
1138 script_patch_16(hostdata->script,
1139 CommandCount, slot->cmnd->cmd_len);
1140 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1141 to32bit(&slot->pSG[0].ins));
1143 /* Note: setting SXFER only works if we're
1144 * still in the MESSAGE phase, so it is vital
1145 * that ACK is still asserted when we process
1146 * the reselection message. The resume offset
1147 * should therefore always clear ACK */
1148 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1150 dma_cache_sync(hostdata->msgin,
1151 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1152 dma_cache_sync(hostdata->msgout,
1153 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1154 /* I'm just being paranoid here, the command should
1155 * already have been flushed from the cache */
1156 dma_cache_sync(slot->cmnd->cmnd,
1157 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1162 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1164 /* This section is full of debugging code because I've
1165 * never managed to reach it. I think what happens is
1166 * that, because the 700 runs with selection
1167 * interrupts enabled the whole time that we take a
1168 * selection interrupt before we manage to get to the
1169 * reselected script interrupt */
1171 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1172 struct NCR_700_command_slot *slot;
1174 /* Take out our own ID */
1175 reselection_id &= ~(1<<host->this_id);
1177 /* I've never seen this happen, so keep this as a printk rather
1179 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1180 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1183 /* FIXME: DEBUGGING CODE */
1184 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1187 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1188 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1189 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1192 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);
1193 SCp = hostdata->slots[i].cmnd;
1197 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1198 /* change slot from busy to queued to redo command */
1199 slot->state = NCR_700_SLOT_QUEUED;
1201 hostdata->cmd = NULL;
1203 if(reselection_id == 0) {
1204 if(hostdata->reselection_id == 0xff) {
1205 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1208 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1210 reselection_id = hostdata->reselection_id;
1214 /* convert to real ID */
1215 reselection_id = bitmap_to_number(reselection_id);
1217 hostdata->reselection_id = reselection_id;
1218 /* just in case we have a stale simple tag message, clear it */
1219 hostdata->msgin[1] = 0;
1220 dma_cache_sync(hostdata->msgin,
1221 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1222 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1223 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1225 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1227 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1228 /* we've just disconnected from the bus, do nothing since
1229 * a return here will re-run the queued command slot
1230 * that may have been interrupted by the initial selection */
1231 DEBUG((" SELECTION COMPLETED\n"));
1232 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1233 resume_offset = process_message(host, hostdata, SCp,
1235 } else if((dsps & 0xfffff000) == 0) {
1236 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1237 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1238 host->host_no, pun, lun, NCR_700_condition[i],
1239 NCR_700_phase[j], dsp - hostdata->pScript);
1241 scsi_print_command(SCp);
1244 for(i = 0; i < SCp->use_sg + 1; i++) {
1245 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->request_buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1249 NCR_700_internal_bus_reset(host);
1250 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1251 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1252 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1253 resume_offset = dsp;
1255 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1256 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1257 NCR_700_internal_bus_reset(host);
1259 return resume_offset;
1262 /* We run the 53c700 with selection interrupts always enabled. This
1263 * means that the chip may be selected as soon as the bus frees. On a
1264 * busy bus, this can be before the scripts engine finishes its
1265 * processing. Therefore, part of the selection processing has to be
1266 * to find out what the scripts engine is doing and complete the
1267 * function if necessary (i.e. process the pending disconnect or save
1268 * the interrupted initial selection */
1270 process_selection(struct Scsi_Host *host, __u32 dsp)
1272 __u8 id = 0; /* Squash compiler warning */
1274 __u32 resume_offset = 0;
1275 struct NCR_700_Host_Parameters *hostdata =
1276 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1277 struct scsi_cmnd *SCp = hostdata->cmd;
1280 for(count = 0; count < 5; count++) {
1281 id = NCR_700_readb(host, hostdata->chip710 ?
1282 CTEST9_REG : SFBR_REG);
1284 /* Take out our own ID */
1285 id &= ~(1<<host->this_id);
1290 sbcl = NCR_700_readb(host, SBCL_REG);
1291 if((sbcl & SBCL_IO) == 0) {
1292 /* mark as having been selected rather than reselected */
1295 /* convert to real ID */
1296 hostdata->reselection_id = id = bitmap_to_number(id);
1297 DEBUG(("scsi%d: Reselected by %d\n",
1298 host->host_no, id));
1300 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1301 struct NCR_700_command_slot *slot =
1302 (struct NCR_700_command_slot *)SCp->host_scribble;
1303 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));
1305 switch(dsp - hostdata->pScript) {
1306 case Ent_Disconnect1:
1307 case Ent_Disconnect2:
1308 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1310 case Ent_Disconnect3:
1311 case Ent_Disconnect4:
1312 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1314 case Ent_Disconnect5:
1315 case Ent_Disconnect6:
1316 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1318 case Ent_Disconnect7:
1319 case Ent_Disconnect8:
1320 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1324 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1328 slot->state = NCR_700_SLOT_QUEUED;
1332 hostdata->state = NCR_700_HOST_BUSY;
1333 hostdata->cmd = NULL;
1334 /* clear any stale simple tag message */
1335 hostdata->msgin[1] = 0;
1336 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1340 /* Selected as target, Ignore */
1341 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1342 } else if(hostdata->tag_negotiated & (1<<id)) {
1343 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1345 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1347 return resume_offset;
1351 NCR_700_clear_fifo(struct Scsi_Host *host) {
1352 const struct NCR_700_Host_Parameters *hostdata
1353 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1354 if(hostdata->chip710) {
1355 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1357 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1362 NCR_700_flush_fifo(struct Scsi_Host *host) {
1363 const struct NCR_700_Host_Parameters *hostdata
1364 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1365 if(hostdata->chip710) {
1366 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1368 NCR_700_writeb(0, host, CTEST8_REG);
1370 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1372 NCR_700_writeb(0, host, DFIFO_REG);
1377 /* The queue lock with interrupts disabled must be held on entry to
1380 NCR_700_start_command(struct scsi_cmnd *SCp)
1382 struct NCR_700_command_slot *slot =
1383 (struct NCR_700_command_slot *)SCp->host_scribble;
1384 struct NCR_700_Host_Parameters *hostdata =
1385 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1386 __u16 count = 1; /* for IDENTIFY message */
1388 if(hostdata->state != NCR_700_HOST_FREE) {
1389 /* keep this inside the lock to close the race window where
1390 * the running command finishes on another CPU while we don't
1391 * change the state to queued on this one */
1392 slot->state = NCR_700_SLOT_QUEUED;
1394 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1395 SCp->device->host->host_no, slot->cmnd, slot));
1398 hostdata->state = NCR_700_HOST_BUSY;
1399 hostdata->cmd = SCp;
1400 slot->state = NCR_700_SLOT_BUSY;
1401 /* keep interrupts disabled until we have the command correctly
1402 * set up so we cannot take a selection interrupt */
1404 hostdata->msgout[0] = NCR_700_identify((SCp->cmnd[0] != REQUEST_SENSE &&
1405 slot->flags != NCR_700_FLAG_AUTOSENSE),
1407 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1408 * if the negotiated transfer parameters still hold, so
1409 * always renegotiate them */
1410 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE ||
1411 slot->flags == NCR_700_FLAG_AUTOSENSE) {
1412 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1415 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1416 * If a contingent allegiance condition exists, the device
1417 * will refuse all tags, so send the request sense as untagged
1419 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1420 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE &&
1421 slot->flags != NCR_700_FLAG_AUTOSENSE)) {
1422 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1425 if(hostdata->fast &&
1426 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1427 count += spi_populate_sync_msg(&hostdata->msgout[count],
1428 spi_period(SCp->device->sdev_target),
1429 spi_offset(SCp->device->sdev_target));
1430 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1433 script_patch_16(hostdata->script, MessageCount, count);
1436 script_patch_ID(hostdata->script,
1437 Device_ID, 1<<scmd_id(SCp));
1439 script_patch_32_abs(hostdata->script, CommandAddress,
1441 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1442 /* finally plumb the beginning of the SG list into the script
1444 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1445 to32bit(&slot->pSG[0].ins));
1446 NCR_700_clear_fifo(SCp->device->host);
1448 if(slot->resume_offset == 0)
1449 slot->resume_offset = hostdata->pScript;
1450 /* now perform all the writebacks and invalidates */
1451 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1452 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1454 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1455 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1457 /* set the synchronous period/offset */
1458 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1459 SCp->device->host, SXFER_REG);
1460 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1461 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1467 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1469 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1470 struct NCR_700_Host_Parameters *hostdata =
1471 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1473 __u32 resume_offset = 0;
1474 __u8 pun = 0xff, lun = 0xff;
1475 unsigned long flags;
1478 /* Use the host lock to serialise acess to the 53c700
1479 * hardware. Note: In future, we may need to take the queue
1480 * lock to enter the done routines. When that happens, we
1481 * need to ensure that for this driver, the host lock and the
1482 * queue lock point to the same thing. */
1483 spin_lock_irqsave(host->host_lock, flags);
1484 if((istat = NCR_700_readb(host, ISTAT_REG))
1485 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1487 __u8 sstat0 = 0, dstat = 0;
1489 struct scsi_cmnd *SCp = hostdata->cmd;
1490 enum NCR_700_Host_State state;
1493 state = hostdata->state;
1494 SCp = hostdata->cmd;
1496 if(istat & SCSI_INT_PENDING) {
1499 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1502 if(istat & DMA_INT_PENDING) {
1505 dstat = NCR_700_readb(host, DSTAT_REG);
1508 dsps = NCR_700_readl(host, DSPS_REG);
1509 dsp = NCR_700_readl(host, DSP_REG);
1511 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1512 host->host_no, istat, sstat0, dstat,
1513 (dsp - (__u32)(hostdata->pScript))/4,
1517 pun = SCp->device->id;
1518 lun = SCp->device->lun;
1521 if(sstat0 & SCSI_RESET_DETECTED) {
1522 struct scsi_device *SDp;
1525 hostdata->state = NCR_700_HOST_BUSY;
1527 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1528 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1530 scsi_report_bus_reset(host, 0);
1532 /* clear all the negotiated parameters */
1533 __shost_for_each_device(SDp, host)
1534 SDp->hostdata = NULL;
1536 /* clear all the slots and their pending commands */
1537 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1538 struct scsi_cmnd *SCp;
1539 struct NCR_700_command_slot *slot =
1540 &hostdata->slots[i];
1542 if(slot->state == NCR_700_SLOT_FREE)
1546 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1548 free_slot(slot, hostdata);
1549 SCp->host_scribble = NULL;
1550 NCR_700_set_depth(SCp->device, 0);
1551 /* NOTE: deadlock potential here: we
1552 * rely on mid-layer guarantees that
1553 * scsi_done won't try to issue the
1554 * command again otherwise we'll
1556 * hostdata->state_lock */
1557 SCp->result = DID_RESET << 16;
1558 SCp->scsi_done(SCp);
1561 NCR_700_chip_setup(host);
1563 hostdata->state = NCR_700_HOST_FREE;
1564 hostdata->cmd = NULL;
1565 /* signal back if this was an eh induced reset */
1566 if(hostdata->eh_complete != NULL)
1567 complete(hostdata->eh_complete);
1569 } else if(sstat0 & SELECTION_TIMEOUT) {
1570 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1571 host->host_no, pun, lun));
1572 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1573 } else if(sstat0 & PHASE_MISMATCH) {
1574 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1575 (struct NCR_700_command_slot *)SCp->host_scribble;
1577 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1578 /* It wants to reply to some part of
1580 #ifdef NCR_700_DEBUG
1581 __u32 temp = NCR_700_readl(host, TEMP_REG);
1582 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1583 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)));
1585 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1586 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1587 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1588 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1589 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1590 int residual = NCR_700_data_residual(host);
1592 #ifdef NCR_700_DEBUG
1593 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1595 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1596 host->host_no, pun, lun,
1597 SGcount, data_transfer);
1598 scsi_print_command(SCp);
1600 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1601 host->host_no, pun, lun,
1602 SGcount, data_transfer, residual);
1605 data_transfer += residual;
1607 if(data_transfer != 0) {
1613 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1614 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1615 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1616 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1617 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1618 pAddr += (count - data_transfer);
1619 #ifdef NCR_700_DEBUG
1620 if(pAddr != naddr) {
1621 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);
1624 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1626 /* set the executed moves to nops */
1627 for(i=0; i<SGcount; i++) {
1628 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1629 slot->SG[i].pAddr = 0;
1631 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1632 /* and pretend we disconnected after
1633 * the command phase */
1634 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1635 /* make sure all the data is flushed */
1636 NCR_700_flush_fifo(host);
1638 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1639 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1640 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1641 NCR_700_internal_bus_reset(host);
1644 } else if(sstat0 & SCSI_GROSS_ERROR) {
1645 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1646 host->host_no, pun, lun);
1647 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1648 } else if(sstat0 & PARITY_ERROR) {
1649 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1650 host->host_no, pun, lun);
1651 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1652 } else if(dstat & SCRIPT_INT_RECEIVED) {
1653 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1654 host->host_no, pun, lun));
1655 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1656 } else if(dstat & (ILGL_INST_DETECTED)) {
1657 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1658 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1659 host->host_no, pun, lun,
1660 dsp, dsp - hostdata->pScript);
1661 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1662 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1663 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1664 host->host_no, pun, lun, dstat);
1665 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1669 /* NOTE: selection interrupt processing MUST occur
1670 * after script interrupt processing to correctly cope
1671 * with the case where we process a disconnect and
1672 * then get reselected before we process the
1674 if(sstat0 & SELECTED) {
1675 /* FIXME: It currently takes at least FOUR
1676 * interrupts to complete a command that
1677 * disconnects: one for the disconnect, one
1678 * for the reselection, one to get the
1679 * reselection data and one to complete the
1680 * command. If we guess the reselected
1681 * command here and prepare it, we only need
1682 * to get a reselection data interrupt if we
1683 * guessed wrongly. Since the interrupt
1684 * overhead is much greater than the command
1685 * setup, this would be an efficient
1686 * optimisation particularly as we probably
1687 * only have one outstanding command on a
1688 * target most of the time */
1690 resume_offset = process_selection(host, dsp);
1697 if(hostdata->state != NCR_700_HOST_BUSY) {
1698 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1699 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1700 hostdata->state = NCR_700_HOST_BUSY;
1703 DEBUG(("Attempting to resume at %x\n", resume_offset));
1704 NCR_700_clear_fifo(host);
1705 NCR_700_writel(resume_offset, host, DSP_REG);
1707 /* There is probably a technical no-no about this: If we're a
1708 * shared interrupt and we got this interrupt because the
1709 * other device needs servicing not us, we're still going to
1710 * check our queued commands here---of course, there shouldn't
1711 * be any outstanding.... */
1712 if(hostdata->state == NCR_700_HOST_FREE) {
1715 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1716 /* fairness: always run the queue from the last
1717 * position we left off */
1718 int j = (i + hostdata->saved_slot_position)
1719 % NCR_700_COMMAND_SLOTS_PER_HOST;
1721 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1723 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1724 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1725 host->host_no, &hostdata->slots[j],
1726 hostdata->slots[j].cmnd));
1727 hostdata->saved_slot_position = j + 1;
1734 spin_unlock_irqrestore(host->host_lock, flags);
1735 return IRQ_RETVAL(handled);
1739 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1741 struct NCR_700_Host_Parameters *hostdata =
1742 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1744 enum dma_data_direction direction;
1745 struct NCR_700_command_slot *slot;
1747 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1748 /* We're over our allocation, this should never happen
1749 * since we report the max allocation to the mid layer */
1750 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1753 /* check for untagged commands. We cannot have any outstanding
1754 * commands if we accept them. Commands could be untagged because:
1756 * - The tag negotiated bitmap is clear
1757 * - The blk layer sent and untagged command
1759 if(NCR_700_get_depth(SCp->device) != 0
1760 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1761 || !blk_rq_tagged(SCp->request))) {
1762 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1763 NCR_700_get_depth(SCp->device));
1764 return SCSI_MLQUEUE_DEVICE_BUSY;
1766 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1767 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1768 NCR_700_get_depth(SCp->device));
1769 return SCSI_MLQUEUE_DEVICE_BUSY;
1771 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1773 /* begin the command here */
1774 /* no need to check for NULL, test for command_slot_count above
1775 * ensures a slot is free */
1776 slot = find_empty_slot(hostdata);
1780 SCp->scsi_done = done;
1781 SCp->host_scribble = (unsigned char *)slot;
1782 SCp->SCp.ptr = NULL;
1783 SCp->SCp.buffer = NULL;
1785 #ifdef NCR_700_DEBUG
1786 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1787 scsi_print_command(SCp);
1789 if(blk_rq_tagged(SCp->request)
1790 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1791 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1792 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1793 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1794 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1797 /* here we may have to process an untagged command. The gate
1798 * above ensures that this will be the only one outstanding,
1799 * so clear the tag negotiated bit.
1801 * FIXME: This will royally screw up on multiple LUN devices
1803 if(!blk_rq_tagged(SCp->request)
1804 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1805 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1806 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1809 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1810 && scsi_get_tag_type(SCp->device)) {
1811 slot->tag = SCp->request->tag;
1812 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1815 slot->tag = SCSI_NO_TAG;
1816 /* must populate current_cmnd for scsi_find_tag to work */
1817 SCp->device->current_cmnd = SCp;
1819 /* sanity check: some of the commands generated by the mid-layer
1820 * have an eccentric idea of their sc_data_direction */
1821 if(!SCp->use_sg && !SCp->request_bufflen
1822 && SCp->sc_data_direction != DMA_NONE) {
1823 #ifdef NCR_700_DEBUG
1824 printk("53c700: Command");
1825 scsi_print_command(SCp);
1826 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1828 SCp->sc_data_direction = DMA_NONE;
1831 switch (SCp->cmnd[0]) {
1833 /* clear the internal sense magic */
1837 /* OK, get it from the command */
1838 switch(SCp->sc_data_direction) {
1839 case DMA_BIDIRECTIONAL:
1841 printk(KERN_ERR "53c700: Unknown command for data direction ");
1842 scsi_print_command(SCp);
1849 case DMA_FROM_DEVICE:
1850 move_ins = SCRIPT_MOVE_DATA_IN;
1853 move_ins = SCRIPT_MOVE_DATA_OUT;
1858 /* now build the scatter gather list */
1859 direction = SCp->sc_data_direction;
1863 dma_addr_t vPtr = 0;
1867 sg_count = dma_map_sg(hostdata->dev,
1868 SCp->request_buffer, SCp->use_sg,
1871 vPtr = dma_map_single(hostdata->dev,
1872 SCp->request_buffer,
1873 SCp->request_bufflen,
1875 count = SCp->request_bufflen;
1876 slot->dma_handle = vPtr;
1881 for(i = 0; i < sg_count; i++) {
1884 struct scatterlist *sg = SCp->request_buffer;
1886 vPtr = sg_dma_address(&sg[i]);
1887 count = sg_dma_len(&sg[i]);
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(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 sizeof(SCp->cmnd), 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(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;
2042 NCR_700_slave_configure(struct scsi_device *SDp)
2044 struct NCR_700_Host_Parameters *hostdata =
2045 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2047 SDp->hostdata = kmalloc(GFP_KERNEL, sizeof(struct NCR_700_sense));
2052 /* to do here: allocate memory; build a queue_full list */
2053 if(SDp->tagged_supported) {
2054 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2055 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2056 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2058 /* initialise to default depth */
2059 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2061 if(hostdata->fast) {
2062 /* Find the correct offset and period via domain validation */
2063 if (!spi_initial_dv(SDp->sdev_target))
2066 spi_offset(SDp->sdev_target) = 0;
2067 spi_period(SDp->sdev_target) = 0;
2073 NCR_700_slave_destroy(struct scsi_device *SDp)
2075 kfree(SDp->hostdata);
2076 SDp->hostdata = NULL;
2080 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2082 if (depth > NCR_700_MAX_TAGS)
2083 depth = NCR_700_MAX_TAGS;
2085 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2089 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2091 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2092 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2093 struct NCR_700_Host_Parameters *hostdata =
2094 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2096 scsi_set_tag_type(SDp, tag_type);
2098 /* We have a global (per target) flag to track whether TCQ is
2099 * enabled, so we'll be turning it off for the entire target here.
2100 * our tag algorithm will fail if we mix tagged and untagged commands,
2101 * so quiesce the device before doing this */
2103 scsi_target_quiesce(SDp->sdev_target);
2106 /* shift back to the default unqueued number of commands
2107 * (the user can still raise this) */
2108 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2109 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2111 /* Here, we cleared the negotiation flag above, so this
2112 * will force the driver to renegotiate */
2113 scsi_activate_tcq(SDp, SDp->queue_depth);
2115 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2118 scsi_target_resume(SDp->sdev_target);
2124 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2126 struct scsi_device *SDp = to_scsi_device(dev);
2128 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2131 static struct device_attribute NCR_700_active_tags_attr = {
2133 .name = "active_tags",
2136 .show = NCR_700_show_active_tags,
2139 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2140 &NCR_700_active_tags_attr,
2144 EXPORT_SYMBOL(NCR_700_detect);
2145 EXPORT_SYMBOL(NCR_700_release);
2146 EXPORT_SYMBOL(NCR_700_intr);
2148 static struct spi_function_template NCR_700_transport_functions = {
2149 .set_period = NCR_700_set_period,
2151 .set_offset = NCR_700_set_offset,
2155 static int __init NCR_700_init(void)
2157 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2158 if(!NCR_700_transport_template)
2163 static void __exit NCR_700_exit(void)
2165 spi_release_transport(NCR_700_transport_template);
2168 module_init(NCR_700_init);
2169 module_exit(NCR_700_exit);
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