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 static char *NCR_700_phase[] = {
189 "before command phase",
190 "after command phase",
191 "after status phase",
192 "after data in phase",
193 "after data out phase",
197 static char *NCR_700_condition[] = {
205 "REJECT_MSG RECEIVED",
206 "DISCONNECT_MSG RECEIVED",
212 static char *NCR_700_fatal_messages[] = {
213 "unexpected message after reselection",
214 "still MSG_OUT after message injection",
215 "not MSG_IN after selection",
216 "Illegal message length received",
219 static char *NCR_700_SBCL_bits[] = {
230 static char *NCR_700_SBCL_to_phase[] = {
241 static __u8 NCR_700_SDTR_msg[] = {
242 0x01, /* Extended message */
243 0x03, /* Extended message Length */
244 0x01, /* SDTR Extended message */
249 /* This translates the SDTR message offset and period to a value
250 * which can be loaded into the SXFER_REG.
252 * NOTE: According to SCSI-2, the true transfer period (in ns) is
253 * actually four times this period value */
255 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
256 __u8 offset, __u8 period)
260 __u8 min_xferp = (hostdata->chip710
261 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
262 __u8 max_offset = (hostdata->chip710
263 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
268 if(period < hostdata->min_period) {
269 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_SDTR_msg[3]*4);
270 period = hostdata->min_period;
272 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
273 if(offset > max_offset) {
274 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
278 if(XFERP < min_xferp) {
279 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
283 return (offset & 0x0f) | (XFERP & 0x07)<<4;
287 NCR_700_get_SXFER(struct scsi_device *SDp)
289 struct NCR_700_Host_Parameters *hostdata =
290 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
292 return NCR_700_offset_period_to_sxfer(hostdata,
293 spi_offset(SDp->sdev_target),
294 spi_period(SDp->sdev_target));
298 NCR_700_detect(struct scsi_host_template *tpnt,
299 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
301 dma_addr_t pScript, pSlots;
304 struct Scsi_Host *host;
305 static int banner = 0;
308 if(tpnt->sdev_attrs == NULL)
309 tpnt->sdev_attrs = NCR_700_dev_attrs;
311 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
312 &pScript, GFP_KERNEL);
314 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
318 script = (__u32 *)memory;
319 hostdata->msgin = memory + MSGIN_OFFSET;
320 hostdata->msgout = memory + MSGOUT_OFFSET;
321 hostdata->status = memory + STATUS_OFFSET;
322 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
323 * if this isn't sufficient separation to avoid dma flushing issues */
324 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
325 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
328 pSlots = pScript + SLOTS_OFFSET;
330 /* Fill in the missing routines from the host template */
331 tpnt->queuecommand = NCR_700_queuecommand;
332 tpnt->eh_abort_handler = NCR_700_abort;
333 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
334 tpnt->eh_host_reset_handler = NCR_700_host_reset;
335 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
336 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
337 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
338 tpnt->use_clustering = ENABLE_CLUSTERING;
339 tpnt->slave_configure = NCR_700_slave_configure;
340 tpnt->slave_destroy = NCR_700_slave_destroy;
341 tpnt->change_queue_depth = NCR_700_change_queue_depth;
342 tpnt->change_queue_type = NCR_700_change_queue_type;
344 if(tpnt->name == NULL)
345 tpnt->name = "53c700";
346 if(tpnt->proc_name == NULL)
347 tpnt->proc_name = "53c700";
350 host = scsi_host_alloc(tpnt, 4);
353 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
354 * NCR_700_COMMAND_SLOTS_PER_HOST);
355 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
356 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
357 - (unsigned long)&hostdata->slots[0].SG[0]);
358 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
360 hostdata->free_list = &hostdata->slots[j];
362 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
363 hostdata->slots[j].state = NCR_700_SLOT_FREE;
366 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
367 script[j] = bS_to_host(SCRIPT[j]);
370 /* adjust all labels to be bus physical */
371 for(j = 0; j < PATCHES; j++) {
372 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
374 /* now patch up fixed addresses. */
375 script_patch_32(script, MessageLocation,
376 pScript + MSGOUT_OFFSET);
377 script_patch_32(script, StatusAddress,
378 pScript + STATUS_OFFSET);
379 script_patch_32(script, ReceiveMsgAddress,
380 pScript + MSGIN_OFFSET);
382 hostdata->script = script;
383 hostdata->pScript = pScript;
384 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
385 hostdata->state = NCR_700_HOST_FREE;
386 hostdata->cmd = NULL;
388 host->max_lun = NCR_700_MAX_LUNS;
389 BUG_ON(NCR_700_transport_template == NULL);
390 host->transportt = NCR_700_transport_template;
391 host->unique_id = (unsigned long)hostdata->base;
392 hostdata->eh_complete = NULL;
393 host->hostdata[0] = (unsigned long)hostdata;
395 NCR_700_writeb(0xff, host, CTEST9_REG);
396 if(hostdata->chip710)
397 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
399 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
400 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
402 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
405 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
406 hostdata->chip710 ? "53c710" :
407 (hostdata->fast ? "53c700-66" : "53c700"),
408 hostdata->rev, hostdata->differential ?
409 "(Differential)" : "");
411 NCR_700_chip_reset(host);
413 if (scsi_add_host(host, dev)) {
414 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
419 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
426 NCR_700_release(struct Scsi_Host *host)
428 struct NCR_700_Host_Parameters *hostdata =
429 (struct NCR_700_Host_Parameters *)host->hostdata[0];
431 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
432 hostdata->script, hostdata->pScript);
437 NCR_700_identify(int can_disconnect, __u8 lun)
439 return IDENTIFY_BASE |
440 ((can_disconnect) ? 0x40 : 0) |
441 (lun & NCR_700_LUN_MASK);
445 * Function : static int data_residual (Scsi_Host *host)
447 * Purpose : return residual data count of what's in the chip. If you
448 * really want to know what this function is doing, it's almost a
449 * direct transcription of the algorithm described in the 53c710
450 * guide, except that the DBC and DFIFO registers are only 6 bits
453 * Inputs : host - SCSI host */
455 NCR_700_data_residual (struct Scsi_Host *host) {
456 struct NCR_700_Host_Parameters *hostdata =
457 (struct NCR_700_Host_Parameters *)host->hostdata[0];
458 int count, synchronous = 0;
461 if(hostdata->chip710) {
462 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
463 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
465 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
466 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
470 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
472 /* get the data direction */
473 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
478 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
480 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
484 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
485 if (sstat & SODL_REG_FULL)
487 if (synchronous && (sstat & SODR_REG_FULL))
492 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
497 /* print out the SCSI wires and corresponding phase from the SBCL register
500 sbcl_to_string(__u8 sbcl)
503 static char ret[256];
508 strcat(ret, NCR_700_SBCL_bits[i]);
510 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
515 bitmap_to_number(__u8 bitmap)
519 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
524 /* Pull a slot off the free list */
525 STATIC struct NCR_700_command_slot *
526 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
528 struct NCR_700_command_slot *slot = hostdata->free_list;
532 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
533 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
537 if(slot->state != NCR_700_SLOT_FREE)
539 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
542 hostdata->free_list = slot->ITL_forw;
543 slot->ITL_forw = NULL;
546 /* NOTE: set the state to busy here, not queued, since this
547 * indicates the slot is in use and cannot be run by the IRQ
548 * finish routine. If we cannot queue the command when it
549 * is properly build, we then change to NCR_700_SLOT_QUEUED */
550 slot->state = NCR_700_SLOT_BUSY;
551 hostdata->command_slot_count++;
557 free_slot(struct NCR_700_command_slot *slot,
558 struct NCR_700_Host_Parameters *hostdata)
560 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
561 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
563 if(slot->state == NCR_700_SLOT_FREE) {
564 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
567 slot->resume_offset = 0;
569 slot->state = NCR_700_SLOT_FREE;
570 slot->ITL_forw = hostdata->free_list;
571 hostdata->free_list = slot;
572 hostdata->command_slot_count--;
576 /* This routine really does very little. The command is indexed on
577 the ITL and (if tagged) the ITLQ lists in _queuecommand */
579 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
580 struct scsi_cmnd *SCp, __u32 dsp)
582 /* Its just possible that this gets executed twice */
584 struct NCR_700_command_slot *slot =
585 (struct NCR_700_command_slot *)SCp->host_scribble;
587 slot->resume_offset = dsp;
589 hostdata->state = NCR_700_HOST_FREE;
590 hostdata->cmd = NULL;
594 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
595 struct NCR_700_command_slot *slot)
597 if(SCp->sc_data_direction != DMA_NONE &&
598 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
600 dma_unmap_sg(hostdata->dev, SCp->buffer,
601 SCp->use_sg, SCp->sc_data_direction);
603 dma_unmap_single(hostdata->dev, slot->dma_handle,
604 SCp->request_bufflen,
605 SCp->sc_data_direction);
611 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
612 struct scsi_cmnd *SCp, int result)
614 hostdata->state = NCR_700_HOST_FREE;
615 hostdata->cmd = NULL;
618 struct NCR_700_command_slot *slot =
619 (struct NCR_700_command_slot *)SCp->host_scribble;
621 NCR_700_unmap(hostdata, SCp, slot);
622 dma_unmap_single(hostdata->dev, slot->pCmd,
623 sizeof(SCp->cmnd), DMA_TO_DEVICE);
624 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
626 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
627 SCp, SCp->cmnd[7], result);
628 scsi_print_sense("53c700", SCp);
631 /* restore the old result if the request sense was
634 result = SCp->cmnd[7];
635 /* now restore the original command */
636 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
637 sizeof(SCp->data_cmnd));
638 SCp->request_buffer = SCp->buffer;
639 SCp->request_bufflen = SCp->bufflen;
640 SCp->use_sg = SCp->old_use_sg;
641 SCp->cmd_len = SCp->old_cmd_len;
642 SCp->sc_data_direction = SCp->sc_old_data_direction;
643 SCp->underflow = SCp->old_underflow;
646 free_slot(slot, hostdata);
648 if(NCR_700_get_depth(SCp->device) == 0 ||
649 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
650 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
651 NCR_700_get_depth(SCp->device));
652 #endif /* NCR_700_DEBUG */
653 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
655 SCp->host_scribble = NULL;
656 SCp->result = result;
659 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
665 NCR_700_internal_bus_reset(struct Scsi_Host *host)
668 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
670 NCR_700_writeb(0, host, SCNTL1_REG);
675 NCR_700_chip_setup(struct Scsi_Host *host)
677 struct NCR_700_Host_Parameters *hostdata =
678 (struct NCR_700_Host_Parameters *)host->hostdata[0];
679 __u32 dcntl_extra = 0;
681 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
683 if(hostdata->chip710) {
684 __u8 burst_disable = hostdata->burst_disable
686 dcntl_extra = COMPAT_700_MODE;
688 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
689 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
690 host, DMODE_710_REG);
691 NCR_700_writeb(burst_disable | (hostdata->differential ?
692 DIFF : 0), host, CTEST7_REG);
693 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
694 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
695 | AUTO_ATN, host, SCNTL0_REG);
697 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
698 host, DMODE_700_REG);
699 NCR_700_writeb(hostdata->differential ?
700 DIFF : 0, host, CTEST7_REG);
702 /* this is for 700-66, does nothing on 700 */
703 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
704 | GENERATE_RECEIVE_PARITY, host,
707 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
708 | PARITY | AUTO_ATN, host, SCNTL0_REG);
712 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
713 NCR_700_writeb(0, host, SBCL_REG);
714 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
716 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
717 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
719 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
720 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
721 if(hostdata->clock > 75) {
722 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
723 /* do the best we can, but the async clock will be out
724 * of spec: sync divider 2, async divider 3 */
725 DEBUG(("53c700: sync 2 async 3\n"));
726 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
727 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
728 hostdata->sync_clock = hostdata->clock/2;
729 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
730 /* sync divider 1.5, async divider 3 */
731 DEBUG(("53c700: sync 1.5 async 3\n"));
732 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
733 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
734 hostdata->sync_clock = hostdata->clock*2;
735 hostdata->sync_clock /= 3;
737 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
738 /* sync divider 1, async divider 2 */
739 DEBUG(("53c700: sync 1 async 2\n"));
740 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
741 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
742 hostdata->sync_clock = hostdata->clock;
743 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
744 /* sync divider 1, async divider 1.5 */
745 DEBUG(("53c700: sync 1 async 1.5\n"));
746 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
747 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
748 hostdata->sync_clock = hostdata->clock;
750 DEBUG(("53c700: sync 1 async 1\n"));
751 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
752 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
753 /* sync divider 1, async divider 1 */
754 hostdata->sync_clock = hostdata->clock;
756 /* Calculate the actual minimum period that can be supported
757 * by our synchronous clock speed. See the 710 manual for
758 * exact details of this calculation which is based on a
759 * setting of the SXFER register */
760 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
761 hostdata->min_period = NCR_700_MIN_PERIOD;
762 if(min_period > NCR_700_MIN_PERIOD)
763 hostdata->min_period = min_period;
767 NCR_700_chip_reset(struct Scsi_Host *host)
769 struct NCR_700_Host_Parameters *hostdata =
770 (struct NCR_700_Host_Parameters *)host->hostdata[0];
771 if(hostdata->chip710) {
772 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
775 NCR_700_writeb(0, host, ISTAT_REG);
777 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
780 NCR_700_writeb(0, host, DCNTL_REG);
785 NCR_700_chip_setup(host);
788 /* The heart of the message processing engine is that the instruction
789 * immediately after the INT is the normal case (and so must be CLEAR
790 * ACK). If we want to do something else, we call that routine in
791 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
792 * ACK) so that the routine returns correctly to resume its activity
795 process_extended_message(struct Scsi_Host *host,
796 struct NCR_700_Host_Parameters *hostdata,
797 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
799 __u32 resume_offset = dsp, temp = dsp + 8;
800 __u8 pun = 0xff, lun = 0xff;
803 pun = SCp->device->id;
804 lun = SCp->device->lun;
807 switch(hostdata->msgin[2]) {
809 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
810 struct scsi_target *starget = SCp->device->sdev_target;
811 __u8 period = hostdata->msgin[3];
812 __u8 offset = hostdata->msgin[4];
814 if(offset == 0 || period == 0) {
819 spi_offset(starget) = offset;
820 spi_period(starget) = period;
822 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
823 spi_display_xfer_agreement(starget);
824 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
827 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
828 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
830 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
834 /* SDTR message out of the blue, reject it */
835 shost_printk(KERN_WARNING, host,
836 "Unexpected SDTR msg\n");
837 hostdata->msgout[0] = A_REJECT_MSG;
838 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
839 script_patch_16(hostdata->script, MessageCount, 1);
840 /* SendMsgOut returns, so set up the return
842 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
847 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
848 host->host_no, pun, lun);
849 hostdata->msgout[0] = A_REJECT_MSG;
850 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
851 script_patch_16(hostdata->script, MessageCount, 1);
852 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
857 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
858 host->host_no, pun, lun,
859 NCR_700_phase[(dsps & 0xf00) >> 8]);
860 scsi_print_msg(hostdata->msgin);
863 hostdata->msgout[0] = A_REJECT_MSG;
864 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
865 script_patch_16(hostdata->script, MessageCount, 1);
866 /* SendMsgOut returns, so set up the return
868 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
870 NCR_700_writel(temp, host, TEMP_REG);
871 return resume_offset;
875 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
876 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
878 /* work out where to return to */
879 __u32 temp = dsp + 8, resume_offset = dsp;
880 __u8 pun = 0xff, lun = 0xff;
883 pun = SCp->device->id;
884 lun = SCp->device->lun;
888 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
889 NCR_700_phase[(dsps & 0xf00) >> 8]);
890 scsi_print_msg(hostdata->msgin);
894 switch(hostdata->msgin[0]) {
897 resume_offset = process_extended_message(host, hostdata, SCp,
902 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
903 /* Rejected our sync negotiation attempt */
904 spi_period(SCp->device->sdev_target) =
905 spi_offset(SCp->device->sdev_target) = 0;
906 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
907 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
908 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
909 /* rejected our first simple tag message */
910 scmd_printk(KERN_WARNING, SCp,
911 "Rejected first tag queue attempt, turning off tag queueing\n");
912 /* we're done negotiating */
913 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
914 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
915 SCp->device->tagged_supported = 0;
916 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
918 shost_printk(KERN_WARNING, host,
919 "(%d:%d) Unexpected REJECT Message %s\n",
921 NCR_700_phase[(dsps & 0xf00) >> 8]);
922 /* however, just ignore it */
926 case A_PARITY_ERROR_MSG:
927 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
929 NCR_700_internal_bus_reset(host);
931 case A_SIMPLE_TAG_MSG:
932 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
933 pun, lun, hostdata->msgin[1],
934 NCR_700_phase[(dsps & 0xf00) >> 8]);
938 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
939 host->host_no, pun, lun,
940 NCR_700_phase[(dsps & 0xf00) >> 8]);
942 scsi_print_msg(hostdata->msgin);
945 hostdata->msgout[0] = A_REJECT_MSG;
946 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
947 script_patch_16(hostdata->script, MessageCount, 1);
948 /* SendMsgOut returns, so set up the return
950 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
954 NCR_700_writel(temp, host, TEMP_REG);
955 /* set us up to receive another message */
956 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
957 return resume_offset;
961 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
962 struct Scsi_Host *host,
963 struct NCR_700_Host_Parameters *hostdata)
965 __u32 resume_offset = 0;
966 __u8 pun = 0xff, lun=0xff;
969 pun = SCp->device->id;
970 lun = SCp->device->lun;
973 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
974 DEBUG((" COMMAND COMPLETE, status=%02x\n",
975 hostdata->status[0]));
976 /* OK, if TCQ still under negotiation, we now know it works */
977 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
978 NCR_700_set_tag_neg_state(SCp->device,
979 NCR_700_FINISHED_TAG_NEGOTIATION);
981 /* check for contingent allegiance contitions */
982 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
983 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
984 struct NCR_700_command_slot *slot =
985 (struct NCR_700_command_slot *)SCp->host_scribble;
986 if(SCp->cmnd[0] == REQUEST_SENSE) {
987 /* OOPS: bad device, returning another
988 * contingent allegiance condition */
989 scmd_printk(KERN_ERR, SCp,
990 "broken device is looping in contingent allegiance: ignoring\n");
991 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
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);
1007 SCp->cmnd[0] = REQUEST_SENSE;
1008 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1011 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1014 /* Here's a quiet hack: the
1015 * REQUEST_SENSE command is six bytes,
1016 * so store a flag indicating that
1017 * this was an internal sense request
1018 * and the original status at the end
1020 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1021 SCp->cmnd[7] = hostdata->status[0];
1023 SCp->sc_data_direction = DMA_FROM_DEVICE;
1024 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1025 SCp->cmd_len, DMA_TO_DEVICE);
1026 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1027 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1028 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1029 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1030 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1031 slot->SG[1].pAddr = 0;
1032 slot->resume_offset = hostdata->pScript;
1033 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1034 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1036 /* queue the command for reissue */
1037 slot->state = NCR_700_SLOT_QUEUED;
1038 hostdata->state = NCR_700_HOST_FREE;
1039 hostdata->cmd = NULL;
1042 // Currently rely on the mid layer evaluation
1043 // of the tag queuing capability
1045 //if(status_byte(hostdata->status[0]) == GOOD &&
1046 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1047 // /* Piggy back the tag queueing support
1048 // * on this command */
1049 // dma_sync_single_for_cpu(hostdata->dev,
1050 // slot->dma_handle,
1051 // SCp->request_bufflen,
1052 // DMA_FROM_DEVICE);
1053 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1054 // scmd_printk(KERN_INFO, SCp,
1055 // "Enabling Tag Command Queuing\n");
1056 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1057 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1059 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1060 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1063 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1065 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1066 __u8 i = (dsps & 0xf00) >> 8;
1068 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1070 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1071 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1073 scsi_print_command(SCp);
1075 NCR_700_internal_bus_reset(host);
1076 } else if((dsps & 0xfffff000) == A_FATAL) {
1077 int i = (dsps & 0xfff);
1079 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1080 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1081 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1082 printk(KERN_ERR " msg begins %02x %02x\n",
1083 hostdata->msgin[0], hostdata->msgin[1]);
1085 NCR_700_internal_bus_reset(host);
1086 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1087 #ifdef NCR_700_DEBUG
1088 __u8 i = (dsps & 0xf00) >> 8;
1090 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1091 host->host_no, pun, lun,
1092 i, NCR_700_phase[i]);
1094 save_for_reselection(hostdata, SCp, dsp);
1096 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1098 struct NCR_700_command_slot *slot;
1099 __u8 reselection_id = hostdata->reselection_id;
1100 struct scsi_device *SDp;
1102 lun = hostdata->msgin[0] & 0x1f;
1104 hostdata->reselection_id = 0xff;
1105 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1106 host->host_no, reselection_id, lun));
1107 /* clear the reselection indicator */
1108 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1109 if(unlikely(SDp == NULL)) {
1110 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1111 host->host_no, reselection_id, lun);
1114 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1115 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1116 if(unlikely(SCp == NULL)) {
1117 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1118 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1122 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1123 DDEBUG(KERN_DEBUG, SDp,
1124 "reselection is tag %d, slot %p(%d)\n",
1125 hostdata->msgin[2], slot, slot->tag);
1127 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1128 if(unlikely(SCp == NULL)) {
1129 sdev_printk(KERN_ERR, SDp,
1130 "no saved request for untagged cmd\n");
1133 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1137 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1138 host->host_no, reselection_id, lun,
1139 hostdata->msgin[0], hostdata->msgin[1],
1140 hostdata->msgin[2]);
1142 if(hostdata->state != NCR_700_HOST_BUSY)
1143 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1145 resume_offset = slot->resume_offset;
1146 hostdata->cmd = slot->cmnd;
1148 /* re-patch for this command */
1149 script_patch_32_abs(hostdata->script, CommandAddress,
1151 script_patch_16(hostdata->script,
1152 CommandCount, slot->cmnd->cmd_len);
1153 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1154 to32bit(&slot->pSG[0].ins));
1156 /* Note: setting SXFER only works if we're
1157 * still in the MESSAGE phase, so it is vital
1158 * that ACK is still asserted when we process
1159 * the reselection message. The resume offset
1160 * should therefore always clear ACK */
1161 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1163 dma_cache_sync(hostdata->msgin,
1164 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1165 dma_cache_sync(hostdata->msgout,
1166 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1167 /* I'm just being paranoid here, the command should
1168 * already have been flushed from the cache */
1169 dma_cache_sync(slot->cmnd->cmnd,
1170 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1175 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1177 /* This section is full of debugging code because I've
1178 * never managed to reach it. I think what happens is
1179 * that, because the 700 runs with selection
1180 * interrupts enabled the whole time that we take a
1181 * selection interrupt before we manage to get to the
1182 * reselected script interrupt */
1184 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1185 struct NCR_700_command_slot *slot;
1187 /* Take out our own ID */
1188 reselection_id &= ~(1<<host->this_id);
1190 /* I've never seen this happen, so keep this as a printk rather
1192 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1193 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1196 /* FIXME: DEBUGGING CODE */
1197 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1200 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1201 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1202 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1205 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);
1206 SCp = hostdata->slots[i].cmnd;
1210 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1211 /* change slot from busy to queued to redo command */
1212 slot->state = NCR_700_SLOT_QUEUED;
1214 hostdata->cmd = NULL;
1216 if(reselection_id == 0) {
1217 if(hostdata->reselection_id == 0xff) {
1218 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1221 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1223 reselection_id = hostdata->reselection_id;
1227 /* convert to real ID */
1228 reselection_id = bitmap_to_number(reselection_id);
1230 hostdata->reselection_id = reselection_id;
1231 /* just in case we have a stale simple tag message, clear it */
1232 hostdata->msgin[1] = 0;
1233 dma_cache_sync(hostdata->msgin,
1234 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1235 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1236 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1238 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1240 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1241 /* we've just disconnected from the bus, do nothing since
1242 * a return here will re-run the queued command slot
1243 * that may have been interrupted by the initial selection */
1244 DEBUG((" SELECTION COMPLETED\n"));
1245 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1246 resume_offset = process_message(host, hostdata, SCp,
1248 } else if((dsps & 0xfffff000) == 0) {
1249 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1250 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1251 host->host_no, pun, lun, NCR_700_condition[i],
1252 NCR_700_phase[j], dsp - hostdata->pScript);
1254 scsi_print_command(SCp);
1257 for(i = 0; i < SCp->use_sg + 1; i++) {
1258 printk(KERN_INFO " SG[%d].length = %d, move_insn=%08x, addr %08x\n", i, ((struct scatterlist *)SCp->buffer)[i].length, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].ins, ((struct NCR_700_command_slot *)SCp->host_scribble)->SG[i].pAddr);
1262 NCR_700_internal_bus_reset(host);
1263 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1264 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1265 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1266 resume_offset = dsp;
1268 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1269 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1270 NCR_700_internal_bus_reset(host);
1272 return resume_offset;
1275 /* We run the 53c700 with selection interrupts always enabled. This
1276 * means that the chip may be selected as soon as the bus frees. On a
1277 * busy bus, this can be before the scripts engine finishes its
1278 * processing. Therefore, part of the selection processing has to be
1279 * to find out what the scripts engine is doing and complete the
1280 * function if necessary (i.e. process the pending disconnect or save
1281 * the interrupted initial selection */
1283 process_selection(struct Scsi_Host *host, __u32 dsp)
1285 __u8 id = 0; /* Squash compiler warning */
1287 __u32 resume_offset = 0;
1288 struct NCR_700_Host_Parameters *hostdata =
1289 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1290 struct scsi_cmnd *SCp = hostdata->cmd;
1293 for(count = 0; count < 5; count++) {
1294 id = NCR_700_readb(host, hostdata->chip710 ?
1295 CTEST9_REG : SFBR_REG);
1297 /* Take out our own ID */
1298 id &= ~(1<<host->this_id);
1303 sbcl = NCR_700_readb(host, SBCL_REG);
1304 if((sbcl & SBCL_IO) == 0) {
1305 /* mark as having been selected rather than reselected */
1308 /* convert to real ID */
1309 hostdata->reselection_id = id = bitmap_to_number(id);
1310 DEBUG(("scsi%d: Reselected by %d\n",
1311 host->host_no, id));
1313 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1314 struct NCR_700_command_slot *slot =
1315 (struct NCR_700_command_slot *)SCp->host_scribble;
1316 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));
1318 switch(dsp - hostdata->pScript) {
1319 case Ent_Disconnect1:
1320 case Ent_Disconnect2:
1321 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1323 case Ent_Disconnect3:
1324 case Ent_Disconnect4:
1325 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1327 case Ent_Disconnect5:
1328 case Ent_Disconnect6:
1329 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1331 case Ent_Disconnect7:
1332 case Ent_Disconnect8:
1333 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1337 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1341 slot->state = NCR_700_SLOT_QUEUED;
1345 hostdata->state = NCR_700_HOST_BUSY;
1346 hostdata->cmd = NULL;
1347 /* clear any stale simple tag message */
1348 hostdata->msgin[1] = 0;
1349 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1353 /* Selected as target, Ignore */
1354 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1355 } else if(hostdata->tag_negotiated & (1<<id)) {
1356 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1358 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1360 return resume_offset;
1364 NCR_700_clear_fifo(struct Scsi_Host *host) {
1365 const struct NCR_700_Host_Parameters *hostdata
1366 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1367 if(hostdata->chip710) {
1368 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1370 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1375 NCR_700_flush_fifo(struct Scsi_Host *host) {
1376 const struct NCR_700_Host_Parameters *hostdata
1377 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1378 if(hostdata->chip710) {
1379 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1381 NCR_700_writeb(0, host, CTEST8_REG);
1383 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1385 NCR_700_writeb(0, host, DFIFO_REG);
1390 /* The queue lock with interrupts disabled must be held on entry to
1393 NCR_700_start_command(struct scsi_cmnd *SCp)
1395 struct NCR_700_command_slot *slot =
1396 (struct NCR_700_command_slot *)SCp->host_scribble;
1397 struct NCR_700_Host_Parameters *hostdata =
1398 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1399 __u16 count = 1; /* for IDENTIFY message */
1401 if(hostdata->state != NCR_700_HOST_FREE) {
1402 /* keep this inside the lock to close the race window where
1403 * the running command finishes on another CPU while we don't
1404 * change the state to queued on this one */
1405 slot->state = NCR_700_SLOT_QUEUED;
1407 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1408 SCp->device->host->host_no, slot->cmnd, slot));
1411 hostdata->state = NCR_700_HOST_BUSY;
1412 hostdata->cmd = SCp;
1413 slot->state = NCR_700_SLOT_BUSY;
1414 /* keep interrupts disabled until we have the command correctly
1415 * set up so we cannot take a selection interrupt */
1417 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1419 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1420 * if the negotiated transfer parameters still hold, so
1421 * always renegotiate them */
1422 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1423 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1426 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1427 * If a contingent allegiance condition exists, the device
1428 * will refuse all tags, so send the request sense as untagged
1430 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1431 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1432 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1435 if(hostdata->fast &&
1436 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1437 memcpy(&hostdata->msgout[count], NCR_700_SDTR_msg,
1438 sizeof(NCR_700_SDTR_msg));
1439 hostdata->msgout[count+3] = spi_period(SCp->device->sdev_target);
1440 hostdata->msgout[count+4] = spi_offset(SCp->device->sdev_target);
1441 count += sizeof(NCR_700_SDTR_msg);
1442 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1445 script_patch_16(hostdata->script, MessageCount, count);
1448 script_patch_ID(hostdata->script,
1449 Device_ID, 1<<scmd_id(SCp));
1451 script_patch_32_abs(hostdata->script, CommandAddress,
1453 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1454 /* finally plumb the beginning of the SG list into the script
1456 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1457 to32bit(&slot->pSG[0].ins));
1458 NCR_700_clear_fifo(SCp->device->host);
1460 if(slot->resume_offset == 0)
1461 slot->resume_offset = hostdata->pScript;
1462 /* now perform all the writebacks and invalidates */
1463 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1464 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1466 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1467 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1469 /* set the synchronous period/offset */
1470 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1471 SCp->device->host, SXFER_REG);
1472 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1473 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1479 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1481 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1482 struct NCR_700_Host_Parameters *hostdata =
1483 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1485 __u32 resume_offset = 0;
1486 __u8 pun = 0xff, lun = 0xff;
1487 unsigned long flags;
1490 /* Use the host lock to serialise acess to the 53c700
1491 * hardware. Note: In future, we may need to take the queue
1492 * lock to enter the done routines. When that happens, we
1493 * need to ensure that for this driver, the host lock and the
1494 * queue lock point to the same thing. */
1495 spin_lock_irqsave(host->host_lock, flags);
1496 if((istat = NCR_700_readb(host, ISTAT_REG))
1497 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1499 __u8 sstat0 = 0, dstat = 0;
1501 struct scsi_cmnd *SCp = hostdata->cmd;
1502 enum NCR_700_Host_State state;
1505 state = hostdata->state;
1506 SCp = hostdata->cmd;
1508 if(istat & SCSI_INT_PENDING) {
1511 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1514 if(istat & DMA_INT_PENDING) {
1517 dstat = NCR_700_readb(host, DSTAT_REG);
1520 dsps = NCR_700_readl(host, DSPS_REG);
1521 dsp = NCR_700_readl(host, DSP_REG);
1523 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1524 host->host_no, istat, sstat0, dstat,
1525 (dsp - (__u32)(hostdata->pScript))/4,
1529 pun = SCp->device->id;
1530 lun = SCp->device->lun;
1533 if(sstat0 & SCSI_RESET_DETECTED) {
1534 struct scsi_device *SDp;
1537 hostdata->state = NCR_700_HOST_BUSY;
1539 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1540 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1542 scsi_report_bus_reset(host, 0);
1544 /* clear all the negotiated parameters */
1545 __shost_for_each_device(SDp, host)
1546 SDp->hostdata = NULL;
1548 /* clear all the slots and their pending commands */
1549 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1550 struct scsi_cmnd *SCp;
1551 struct NCR_700_command_slot *slot =
1552 &hostdata->slots[i];
1554 if(slot->state == NCR_700_SLOT_FREE)
1558 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1560 free_slot(slot, hostdata);
1561 SCp->host_scribble = NULL;
1562 NCR_700_set_depth(SCp->device, 0);
1563 /* NOTE: deadlock potential here: we
1564 * rely on mid-layer guarantees that
1565 * scsi_done won't try to issue the
1566 * command again otherwise we'll
1568 * hostdata->state_lock */
1569 SCp->result = DID_RESET << 16;
1570 SCp->scsi_done(SCp);
1573 NCR_700_chip_setup(host);
1575 hostdata->state = NCR_700_HOST_FREE;
1576 hostdata->cmd = NULL;
1577 /* signal back if this was an eh induced reset */
1578 if(hostdata->eh_complete != NULL)
1579 complete(hostdata->eh_complete);
1581 } else if(sstat0 & SELECTION_TIMEOUT) {
1582 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1583 host->host_no, pun, lun));
1584 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1585 } else if(sstat0 & PHASE_MISMATCH) {
1586 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1587 (struct NCR_700_command_slot *)SCp->host_scribble;
1589 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1590 /* It wants to reply to some part of
1592 #ifdef NCR_700_DEBUG
1593 __u32 temp = NCR_700_readl(host, TEMP_REG);
1594 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1595 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)));
1597 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1598 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1599 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1600 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1601 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1602 int residual = NCR_700_data_residual(host);
1604 #ifdef NCR_700_DEBUG
1605 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1607 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1608 host->host_no, pun, lun,
1609 SGcount, data_transfer);
1610 scsi_print_command(SCp);
1612 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1613 host->host_no, pun, lun,
1614 SGcount, data_transfer, residual);
1617 data_transfer += residual;
1619 if(data_transfer != 0) {
1625 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1626 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1627 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1628 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1629 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1630 pAddr += (count - data_transfer);
1631 #ifdef NCR_700_DEBUG
1632 if(pAddr != naddr) {
1633 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);
1636 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1638 /* set the executed moves to nops */
1639 for(i=0; i<SGcount; i++) {
1640 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1641 slot->SG[i].pAddr = 0;
1643 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1644 /* and pretend we disconnected after
1645 * the command phase */
1646 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1647 /* make sure all the data is flushed */
1648 NCR_700_flush_fifo(host);
1650 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1651 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1652 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1653 NCR_700_internal_bus_reset(host);
1656 } else if(sstat0 & SCSI_GROSS_ERROR) {
1657 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1658 host->host_no, pun, lun);
1659 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1660 } else if(sstat0 & PARITY_ERROR) {
1661 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1662 host->host_no, pun, lun);
1663 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1664 } else if(dstat & SCRIPT_INT_RECEIVED) {
1665 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1666 host->host_no, pun, lun));
1667 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1668 } else if(dstat & (ILGL_INST_DETECTED)) {
1669 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1670 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1671 host->host_no, pun, lun,
1672 dsp, dsp - hostdata->pScript);
1673 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1674 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1675 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1676 host->host_no, pun, lun, dstat);
1677 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1681 /* NOTE: selection interrupt processing MUST occur
1682 * after script interrupt processing to correctly cope
1683 * with the case where we process a disconnect and
1684 * then get reselected before we process the
1686 if(sstat0 & SELECTED) {
1687 /* FIXME: It currently takes at least FOUR
1688 * interrupts to complete a command that
1689 * disconnects: one for the disconnect, one
1690 * for the reselection, one to get the
1691 * reselection data and one to complete the
1692 * command. If we guess the reselected
1693 * command here and prepare it, we only need
1694 * to get a reselection data interrupt if we
1695 * guessed wrongly. Since the interrupt
1696 * overhead is much greater than the command
1697 * setup, this would be an efficient
1698 * optimisation particularly as we probably
1699 * only have one outstanding command on a
1700 * target most of the time */
1702 resume_offset = process_selection(host, dsp);
1709 if(hostdata->state != NCR_700_HOST_BUSY) {
1710 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1711 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1712 hostdata->state = NCR_700_HOST_BUSY;
1715 DEBUG(("Attempting to resume at %x\n", resume_offset));
1716 NCR_700_clear_fifo(host);
1717 NCR_700_writel(resume_offset, host, DSP_REG);
1719 /* There is probably a technical no-no about this: If we're a
1720 * shared interrupt and we got this interrupt because the
1721 * other device needs servicing not us, we're still going to
1722 * check our queued commands here---of course, there shouldn't
1723 * be any outstanding.... */
1724 if(hostdata->state == NCR_700_HOST_FREE) {
1727 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1728 /* fairness: always run the queue from the last
1729 * position we left off */
1730 int j = (i + hostdata->saved_slot_position)
1731 % NCR_700_COMMAND_SLOTS_PER_HOST;
1733 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1735 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1736 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1737 host->host_no, &hostdata->slots[j],
1738 hostdata->slots[j].cmnd));
1739 hostdata->saved_slot_position = j + 1;
1746 spin_unlock_irqrestore(host->host_lock, flags);
1747 return IRQ_RETVAL(handled);
1751 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1753 struct NCR_700_Host_Parameters *hostdata =
1754 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1756 enum dma_data_direction direction;
1757 struct NCR_700_command_slot *slot;
1759 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1760 /* We're over our allocation, this should never happen
1761 * since we report the max allocation to the mid layer */
1762 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1765 /* check for untagged commands. We cannot have any outstanding
1766 * commands if we accept them. Commands could be untagged because:
1768 * - The tag negotiated bitmap is clear
1769 * - The blk layer sent and untagged command
1771 if(NCR_700_get_depth(SCp->device) != 0
1772 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1773 || !blk_rq_tagged(SCp->request))) {
1774 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1775 NCR_700_get_depth(SCp->device));
1776 return SCSI_MLQUEUE_DEVICE_BUSY;
1778 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1779 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1780 NCR_700_get_depth(SCp->device));
1781 return SCSI_MLQUEUE_DEVICE_BUSY;
1783 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1785 /* begin the command here */
1786 /* no need to check for NULL, test for command_slot_count above
1787 * ensures a slot is free */
1788 slot = find_empty_slot(hostdata);
1792 SCp->scsi_done = done;
1793 SCp->host_scribble = (unsigned char *)slot;
1794 SCp->SCp.ptr = NULL;
1795 SCp->SCp.buffer = NULL;
1797 #ifdef NCR_700_DEBUG
1798 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1799 scsi_print_command(SCp);
1801 if(blk_rq_tagged(SCp->request)
1802 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1803 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1804 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1805 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1806 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1809 /* here we may have to process an untagged command. The gate
1810 * above ensures that this will be the only one outstanding,
1811 * so clear the tag negotiated bit.
1813 * FIXME: This will royally screw up on multiple LUN devices
1815 if(!blk_rq_tagged(SCp->request)
1816 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1817 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1818 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1821 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1822 && scsi_get_tag_type(SCp->device)) {
1823 slot->tag = SCp->request->tag;
1824 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1827 slot->tag = SCSI_NO_TAG;
1828 /* must populate current_cmnd for scsi_find_tag to work */
1829 SCp->device->current_cmnd = SCp;
1831 /* sanity check: some of the commands generated by the mid-layer
1832 * have an eccentric idea of their sc_data_direction */
1833 if(!SCp->use_sg && !SCp->request_bufflen
1834 && SCp->sc_data_direction != DMA_NONE) {
1835 #ifdef NCR_700_DEBUG
1836 printk("53c700: Command");
1837 scsi_print_command(SCp);
1838 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1840 SCp->sc_data_direction = DMA_NONE;
1843 switch (SCp->cmnd[0]) {
1845 /* clear the internal sense magic */
1849 /* OK, get it from the command */
1850 switch(SCp->sc_data_direction) {
1851 case DMA_BIDIRECTIONAL:
1853 printk(KERN_ERR "53c700: Unknown command for data direction ");
1854 scsi_print_command(SCp);
1861 case DMA_FROM_DEVICE:
1862 move_ins = SCRIPT_MOVE_DATA_IN;
1865 move_ins = SCRIPT_MOVE_DATA_OUT;
1870 /* now build the scatter gather list */
1871 direction = SCp->sc_data_direction;
1875 dma_addr_t vPtr = 0;
1879 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1880 SCp->use_sg, direction);
1882 vPtr = dma_map_single(hostdata->dev,
1883 SCp->request_buffer,
1884 SCp->request_bufflen,
1886 count = SCp->request_bufflen;
1887 slot->dma_handle = vPtr;
1892 for(i = 0; i < sg_count; i++) {
1895 struct scatterlist *sg = SCp->buffer;
1897 vPtr = sg_dma_address(&sg[i]);
1898 count = sg_dma_len(&sg[i]);
1901 slot->SG[i].ins = bS_to_host(move_ins | count);
1902 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1903 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1904 slot->SG[i].pAddr = bS_to_host(vPtr);
1906 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1907 slot->SG[i].pAddr = 0;
1908 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1909 DEBUG((" SETTING %08lx to %x\n",
1910 (&slot->pSG[i].ins),
1913 slot->resume_offset = 0;
1914 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1915 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1916 NCR_700_start_command(SCp);
1921 NCR_700_abort(struct scsi_cmnd * SCp)
1923 struct NCR_700_command_slot *slot;
1925 scmd_printk(KERN_INFO, SCp,
1926 "New error handler wants to abort command\n\t");
1927 scsi_print_command(SCp);
1929 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1932 /* no outstanding command to abort */
1934 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1935 /* FIXME: This is because of a problem in the new
1936 * error handler. When it is in error recovery, it
1937 * will send a TUR to a device it thinks may still be
1938 * showing a problem. If the TUR isn't responded to,
1939 * it will abort it and mark the device off line.
1940 * Unfortunately, it does no other error recovery, so
1941 * this would leave us with an outstanding command
1942 * occupying a slot. Rather than allow this to
1943 * happen, we issue a bus reset to force all
1944 * outstanding commands to terminate here. */
1945 NCR_700_internal_bus_reset(SCp->device->host);
1946 /* still drop through and return failed */
1953 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1955 DECLARE_COMPLETION(complete);
1956 struct NCR_700_Host_Parameters *hostdata =
1957 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1959 scmd_printk(KERN_INFO, SCp,
1960 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1961 scsi_print_command(SCp);
1963 /* In theory, eh_complete should always be null because the
1964 * eh is single threaded, but just in case we're handling a
1965 * reset via sg or something */
1966 spin_lock_irq(SCp->device->host->host_lock);
1967 while (hostdata->eh_complete != NULL) {
1968 spin_unlock_irq(SCp->device->host->host_lock);
1969 msleep_interruptible(100);
1970 spin_lock_irq(SCp->device->host->host_lock);
1973 hostdata->eh_complete = &complete;
1974 NCR_700_internal_bus_reset(SCp->device->host);
1976 spin_unlock_irq(SCp->device->host->host_lock);
1977 wait_for_completion(&complete);
1978 spin_lock_irq(SCp->device->host->host_lock);
1980 hostdata->eh_complete = NULL;
1981 /* Revalidate the transport parameters of the failing device */
1983 spi_schedule_dv_device(SCp->device);
1985 spin_unlock_irq(SCp->device->host->host_lock);
1990 NCR_700_host_reset(struct scsi_cmnd * SCp)
1992 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1993 scsi_print_command(SCp);
1995 spin_lock_irq(SCp->device->host->host_lock);
1997 NCR_700_internal_bus_reset(SCp->device->host);
1998 NCR_700_chip_reset(SCp->device->host);
2000 spin_unlock_irq(SCp->device->host->host_lock);
2006 NCR_700_set_period(struct scsi_target *STp, int period)
2008 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2009 struct NCR_700_Host_Parameters *hostdata =
2010 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2015 if(period < hostdata->min_period)
2016 period = hostdata->min_period;
2018 spi_period(STp) = period;
2019 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2020 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2021 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2025 NCR_700_set_offset(struct scsi_target *STp, int offset)
2027 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2028 struct NCR_700_Host_Parameters *hostdata =
2029 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2030 int max_offset = hostdata->chip710
2031 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2036 if(offset > max_offset)
2037 offset = max_offset;
2039 /* if we're currently async, make sure the period is reasonable */
2040 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2041 spi_period(STp) > 0xff))
2042 spi_period(STp) = hostdata->min_period;
2044 spi_offset(STp) = offset;
2045 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2046 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2047 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2053 NCR_700_slave_configure(struct scsi_device *SDp)
2055 struct NCR_700_Host_Parameters *hostdata =
2056 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2058 /* to do here: allocate memory; build a queue_full list */
2059 if(SDp->tagged_supported) {
2060 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2061 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2062 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2064 /* initialise to default depth */
2065 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2067 if(hostdata->fast) {
2068 /* Find the correct offset and period via domain validation */
2069 if (!spi_initial_dv(SDp->sdev_target))
2072 spi_offset(SDp->sdev_target) = 0;
2073 spi_period(SDp->sdev_target) = 0;
2079 NCR_700_slave_destroy(struct scsi_device *SDp)
2081 /* to do here: deallocate memory */
2085 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2087 if (depth > NCR_700_MAX_TAGS)
2088 depth = NCR_700_MAX_TAGS;
2090 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2094 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2096 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2097 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2098 struct NCR_700_Host_Parameters *hostdata =
2099 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2101 scsi_set_tag_type(SDp, tag_type);
2103 /* We have a global (per target) flag to track whether TCQ is
2104 * enabled, so we'll be turning it off for the entire target here.
2105 * our tag algorithm will fail if we mix tagged and untagged commands,
2106 * so quiesce the device before doing this */
2108 scsi_target_quiesce(SDp->sdev_target);
2111 /* shift back to the default unqueued number of commands
2112 * (the user can still raise this) */
2113 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2114 hostdata->tag_negotiated &= ~(1 << 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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