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 /* This translates the SDTR message offset and period to a value
242 * which can be loaded into the SXFER_REG.
244 * NOTE: According to SCSI-2, the true transfer period (in ns) is
245 * actually four times this period value */
247 NCR_700_offset_period_to_sxfer(struct NCR_700_Host_Parameters *hostdata,
248 __u8 offset, __u8 period)
252 __u8 min_xferp = (hostdata->chip710
253 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
254 __u8 max_offset = (hostdata->chip710
255 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET);
260 if(period < hostdata->min_period) {
261 printk(KERN_WARNING "53c700: Period %dns is less than this chip's minimum, setting to %d\n", period*4, NCR_700_MIN_PERIOD*4);
262 period = hostdata->min_period;
264 XFERP = (period*4 * hostdata->sync_clock)/1000 - 4;
265 if(offset > max_offset) {
266 printk(KERN_WARNING "53c700: Offset %d exceeds chip maximum, setting to %d\n",
270 if(XFERP < min_xferp) {
271 printk(KERN_WARNING "53c700: XFERP %d is less than minium, setting to %d\n",
275 return (offset & 0x0f) | (XFERP & 0x07)<<4;
279 NCR_700_get_SXFER(struct scsi_device *SDp)
281 struct NCR_700_Host_Parameters *hostdata =
282 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
284 return NCR_700_offset_period_to_sxfer(hostdata,
285 spi_offset(SDp->sdev_target),
286 spi_period(SDp->sdev_target));
290 NCR_700_detect(struct scsi_host_template *tpnt,
291 struct NCR_700_Host_Parameters *hostdata, struct device *dev)
293 dma_addr_t pScript, pSlots;
296 struct Scsi_Host *host;
297 static int banner = 0;
300 if(tpnt->sdev_attrs == NULL)
301 tpnt->sdev_attrs = NCR_700_dev_attrs;
303 memory = dma_alloc_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
304 &pScript, GFP_KERNEL);
306 printk(KERN_ERR "53c700: Failed to allocate memory for driver, detatching\n");
310 script = (__u32 *)memory;
311 hostdata->msgin = memory + MSGIN_OFFSET;
312 hostdata->msgout = memory + MSGOUT_OFFSET;
313 hostdata->status = memory + STATUS_OFFSET;
314 /* all of these offsets are L1_CACHE_BYTES separated. It is fatal
315 * if this isn't sufficient separation to avoid dma flushing issues */
316 BUG_ON(!dma_is_consistent(pScript) && L1_CACHE_BYTES < dma_get_cache_alignment());
317 hostdata->slots = (struct NCR_700_command_slot *)(memory + SLOTS_OFFSET);
320 pSlots = pScript + SLOTS_OFFSET;
322 /* Fill in the missing routines from the host template */
323 tpnt->queuecommand = NCR_700_queuecommand;
324 tpnt->eh_abort_handler = NCR_700_abort;
325 tpnt->eh_bus_reset_handler = NCR_700_bus_reset;
326 tpnt->eh_host_reset_handler = NCR_700_host_reset;
327 tpnt->can_queue = NCR_700_COMMAND_SLOTS_PER_HOST;
328 tpnt->sg_tablesize = NCR_700_SG_SEGMENTS;
329 tpnt->cmd_per_lun = NCR_700_CMD_PER_LUN;
330 tpnt->use_clustering = ENABLE_CLUSTERING;
331 tpnt->slave_configure = NCR_700_slave_configure;
332 tpnt->slave_destroy = NCR_700_slave_destroy;
333 tpnt->change_queue_depth = NCR_700_change_queue_depth;
334 tpnt->change_queue_type = NCR_700_change_queue_type;
336 if(tpnt->name == NULL)
337 tpnt->name = "53c700";
338 if(tpnt->proc_name == NULL)
339 tpnt->proc_name = "53c700";
342 host = scsi_host_alloc(tpnt, 4);
345 memset(hostdata->slots, 0, sizeof(struct NCR_700_command_slot)
346 * NCR_700_COMMAND_SLOTS_PER_HOST);
347 for(j = 0; j < NCR_700_COMMAND_SLOTS_PER_HOST; j++) {
348 dma_addr_t offset = (dma_addr_t)((unsigned long)&hostdata->slots[j].SG[0]
349 - (unsigned long)&hostdata->slots[0].SG[0]);
350 hostdata->slots[j].pSG = (struct NCR_700_SG_List *)((unsigned long)(pSlots + offset));
352 hostdata->free_list = &hostdata->slots[j];
354 hostdata->slots[j-1].ITL_forw = &hostdata->slots[j];
355 hostdata->slots[j].state = NCR_700_SLOT_FREE;
358 for(j = 0; j < sizeof(SCRIPT)/sizeof(SCRIPT[0]); j++) {
359 script[j] = bS_to_host(SCRIPT[j]);
362 /* adjust all labels to be bus physical */
363 for(j = 0; j < PATCHES; j++) {
364 script[LABELPATCHES[j]] = bS_to_host(pScript + SCRIPT[LABELPATCHES[j]]);
366 /* now patch up fixed addresses. */
367 script_patch_32(script, MessageLocation,
368 pScript + MSGOUT_OFFSET);
369 script_patch_32(script, StatusAddress,
370 pScript + STATUS_OFFSET);
371 script_patch_32(script, ReceiveMsgAddress,
372 pScript + MSGIN_OFFSET);
374 hostdata->script = script;
375 hostdata->pScript = pScript;
376 dma_sync_single_for_device(hostdata->dev, pScript, sizeof(SCRIPT), DMA_TO_DEVICE);
377 hostdata->state = NCR_700_HOST_FREE;
378 hostdata->cmd = NULL;
380 host->max_lun = NCR_700_MAX_LUNS;
381 BUG_ON(NCR_700_transport_template == NULL);
382 host->transportt = NCR_700_transport_template;
383 host->unique_id = (unsigned long)hostdata->base;
384 hostdata->eh_complete = NULL;
385 host->hostdata[0] = (unsigned long)hostdata;
387 NCR_700_writeb(0xff, host, CTEST9_REG);
388 if(hostdata->chip710)
389 hostdata->rev = (NCR_700_readb(host, CTEST8_REG)>>4) & 0x0f;
391 hostdata->rev = (NCR_700_readb(host, CTEST7_REG)>>4) & 0x0f;
392 hostdata->fast = (NCR_700_readb(host, CTEST9_REG) == 0);
394 printk(KERN_NOTICE "53c700: Version " NCR_700_VERSION " By James.Bottomley@HansenPartnership.com\n");
397 printk(KERN_NOTICE "scsi%d: %s rev %d %s\n", host->host_no,
398 hostdata->chip710 ? "53c710" :
399 (hostdata->fast ? "53c700-66" : "53c700"),
400 hostdata->rev, hostdata->differential ?
401 "(Differential)" : "");
403 NCR_700_chip_reset(host);
405 if (scsi_add_host(host, dev)) {
406 dev_printk(KERN_ERR, dev, "53c700: scsi_add_host failed\n");
411 spi_signalling(host) = hostdata->differential ? SPI_SIGNAL_HVD :
418 NCR_700_release(struct Scsi_Host *host)
420 struct NCR_700_Host_Parameters *hostdata =
421 (struct NCR_700_Host_Parameters *)host->hostdata[0];
423 dma_free_noncoherent(hostdata->dev, TOTAL_MEM_SIZE,
424 hostdata->script, hostdata->pScript);
429 NCR_700_identify(int can_disconnect, __u8 lun)
431 return IDENTIFY_BASE |
432 ((can_disconnect) ? 0x40 : 0) |
433 (lun & NCR_700_LUN_MASK);
437 * Function : static int data_residual (Scsi_Host *host)
439 * Purpose : return residual data count of what's in the chip. If you
440 * really want to know what this function is doing, it's almost a
441 * direct transcription of the algorithm described in the 53c710
442 * guide, except that the DBC and DFIFO registers are only 6 bits
445 * Inputs : host - SCSI host */
447 NCR_700_data_residual (struct Scsi_Host *host) {
448 struct NCR_700_Host_Parameters *hostdata =
449 (struct NCR_700_Host_Parameters *)host->hostdata[0];
450 int count, synchronous = 0;
453 if(hostdata->chip710) {
454 count = ((NCR_700_readb(host, DFIFO_REG) & 0x7f) -
455 (NCR_700_readl(host, DBC_REG) & 0x7f)) & 0x7f;
457 count = ((NCR_700_readb(host, DFIFO_REG) & 0x3f) -
458 (NCR_700_readl(host, DBC_REG) & 0x3f)) & 0x3f;
462 synchronous = NCR_700_readb(host, SXFER_REG) & 0x0f;
464 /* get the data direction */
465 ddir = NCR_700_readb(host, CTEST0_REG) & 0x01;
470 count += (NCR_700_readb(host, SSTAT2_REG) & 0xf0) >> 4;
472 if (NCR_700_readb(host, SSTAT1_REG) & SIDL_REG_FULL)
476 __u8 sstat = NCR_700_readb(host, SSTAT1_REG);
477 if (sstat & SODL_REG_FULL)
479 if (synchronous && (sstat & SODR_REG_FULL))
484 printk("RESIDUAL IS %d (ddir %d)\n", count, ddir);
489 /* print out the SCSI wires and corresponding phase from the SBCL register
492 sbcl_to_string(__u8 sbcl)
495 static char ret[256];
500 strcat(ret, NCR_700_SBCL_bits[i]);
502 strcat(ret, NCR_700_SBCL_to_phase[sbcl & 0x07]);
507 bitmap_to_number(__u8 bitmap)
511 for(i=0; i<8 && !(bitmap &(1<<i)); i++)
516 /* Pull a slot off the free list */
517 STATIC struct NCR_700_command_slot *
518 find_empty_slot(struct NCR_700_Host_Parameters *hostdata)
520 struct NCR_700_command_slot *slot = hostdata->free_list;
524 if(hostdata->command_slot_count != NCR_700_COMMAND_SLOTS_PER_HOST)
525 printk(KERN_ERR "SLOTS FULL, but count is %d, should be %d\n", hostdata->command_slot_count, NCR_700_COMMAND_SLOTS_PER_HOST);
529 if(slot->state != NCR_700_SLOT_FREE)
531 printk(KERN_ERR "BUSY SLOT ON FREE LIST!!!\n");
534 hostdata->free_list = slot->ITL_forw;
535 slot->ITL_forw = NULL;
538 /* NOTE: set the state to busy here, not queued, since this
539 * indicates the slot is in use and cannot be run by the IRQ
540 * finish routine. If we cannot queue the command when it
541 * is properly build, we then change to NCR_700_SLOT_QUEUED */
542 slot->state = NCR_700_SLOT_BUSY;
543 hostdata->command_slot_count++;
549 free_slot(struct NCR_700_command_slot *slot,
550 struct NCR_700_Host_Parameters *hostdata)
552 if((slot->state & NCR_700_SLOT_MASK) != NCR_700_SLOT_MAGIC) {
553 printk(KERN_ERR "53c700: SLOT %p is not MAGIC!!!\n", slot);
555 if(slot->state == NCR_700_SLOT_FREE) {
556 printk(KERN_ERR "53c700: SLOT %p is FREE!!!\n", slot);
559 slot->resume_offset = 0;
561 slot->state = NCR_700_SLOT_FREE;
562 slot->ITL_forw = hostdata->free_list;
563 hostdata->free_list = slot;
564 hostdata->command_slot_count--;
568 /* This routine really does very little. The command is indexed on
569 the ITL and (if tagged) the ITLQ lists in _queuecommand */
571 save_for_reselection(struct NCR_700_Host_Parameters *hostdata,
572 struct scsi_cmnd *SCp, __u32 dsp)
574 /* Its just possible that this gets executed twice */
576 struct NCR_700_command_slot *slot =
577 (struct NCR_700_command_slot *)SCp->host_scribble;
579 slot->resume_offset = dsp;
581 hostdata->state = NCR_700_HOST_FREE;
582 hostdata->cmd = NULL;
586 NCR_700_unmap(struct NCR_700_Host_Parameters *hostdata, struct scsi_cmnd *SCp,
587 struct NCR_700_command_slot *slot)
589 if(SCp->sc_data_direction != DMA_NONE &&
590 SCp->sc_data_direction != DMA_BIDIRECTIONAL) {
592 dma_unmap_sg(hostdata->dev, SCp->buffer,
593 SCp->use_sg, SCp->sc_data_direction);
595 dma_unmap_single(hostdata->dev, slot->dma_handle,
596 SCp->request_bufflen,
597 SCp->sc_data_direction);
603 NCR_700_scsi_done(struct NCR_700_Host_Parameters *hostdata,
604 struct scsi_cmnd *SCp, int result)
606 hostdata->state = NCR_700_HOST_FREE;
607 hostdata->cmd = NULL;
610 struct NCR_700_command_slot *slot =
611 (struct NCR_700_command_slot *)SCp->host_scribble;
613 NCR_700_unmap(hostdata, SCp, slot);
614 dma_unmap_single(hostdata->dev, slot->pCmd,
615 sizeof(SCp->cmnd), DMA_TO_DEVICE);
616 if(SCp->cmnd[0] == REQUEST_SENSE && SCp->cmnd[6] == NCR_700_INTERNAL_SENSE_MAGIC) {
618 printk(" ORIGINAL CMD %p RETURNED %d, new return is %d sense is\n",
619 SCp, SCp->cmnd[7], result);
620 scsi_print_sense("53c700", SCp);
623 /* restore the old result if the request sense was
626 result = SCp->cmnd[7];
627 /* now restore the original command */
628 memcpy((void *) SCp->cmnd, (void *) SCp->data_cmnd,
629 sizeof(SCp->data_cmnd));
630 SCp->request_buffer = SCp->buffer;
631 SCp->request_bufflen = SCp->bufflen;
632 SCp->use_sg = SCp->old_use_sg;
633 SCp->cmd_len = SCp->old_cmd_len;
634 SCp->sc_data_direction = SCp->sc_old_data_direction;
635 SCp->underflow = SCp->old_underflow;
638 free_slot(slot, hostdata);
640 if(NCR_700_get_depth(SCp->device) == 0 ||
641 NCR_700_get_depth(SCp->device) > SCp->device->queue_depth)
642 printk(KERN_ERR "Invalid depth in NCR_700_scsi_done(): %d\n",
643 NCR_700_get_depth(SCp->device));
644 #endif /* NCR_700_DEBUG */
645 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) - 1);
647 SCp->host_scribble = NULL;
648 SCp->result = result;
651 printk(KERN_ERR "53c700: SCSI DONE HAS NULL SCp\n");
657 NCR_700_internal_bus_reset(struct Scsi_Host *host)
660 NCR_700_writeb(ASSERT_RST, host, SCNTL1_REG);
662 NCR_700_writeb(0, host, SCNTL1_REG);
667 NCR_700_chip_setup(struct Scsi_Host *host)
669 struct NCR_700_Host_Parameters *hostdata =
670 (struct NCR_700_Host_Parameters *)host->hostdata[0];
671 __u32 dcntl_extra = 0;
673 __u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
675 if(hostdata->chip710) {
676 __u8 burst_disable = hostdata->burst_disable
678 dcntl_extra = COMPAT_700_MODE;
680 NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
681 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
682 host, DMODE_710_REG);
683 NCR_700_writeb(burst_disable | (hostdata->differential ?
684 DIFF : 0), host, CTEST7_REG);
685 NCR_700_writeb(BTB_TIMER_DISABLE, host, CTEST0_REG);
686 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY | PARITY
687 | AUTO_ATN, host, SCNTL0_REG);
689 NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
690 host, DMODE_700_REG);
691 NCR_700_writeb(hostdata->differential ?
692 DIFF : 0, host, CTEST7_REG);
694 /* this is for 700-66, does nothing on 700 */
695 NCR_700_writeb(LAST_DIS_ENBL | ENABLE_ACTIVE_NEGATION
696 | GENERATE_RECEIVE_PARITY, host,
699 NCR_700_writeb(FULL_ARBITRATION | ENABLE_PARITY
700 | PARITY | AUTO_ATN, host, SCNTL0_REG);
704 NCR_700_writeb(1 << host->this_id, host, SCID_REG);
705 NCR_700_writeb(0, host, SBCL_REG);
706 NCR_700_writeb(ASYNC_OPERATION, host, SXFER_REG);
708 NCR_700_writeb(PHASE_MM_INT | SEL_TIMEOUT_INT | GROSS_ERR_INT | UX_DISC_INT
709 | RST_INT | PAR_ERR_INT | SELECT_INT, host, SIEN_REG);
711 NCR_700_writeb(ABORT_INT | INT_INST_INT | ILGL_INST_INT, host, DIEN_REG);
712 NCR_700_writeb(ENABLE_SELECT, host, SCNTL1_REG);
713 if(hostdata->clock > 75) {
714 printk(KERN_ERR "53c700: Clock speed %dMHz is too high: 75Mhz is the maximum this chip can be driven at\n", hostdata->clock);
715 /* do the best we can, but the async clock will be out
716 * of spec: sync divider 2, async divider 3 */
717 DEBUG(("53c700: sync 2 async 3\n"));
718 NCR_700_writeb(SYNC_DIV_2_0, host, SBCL_REG);
719 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
720 hostdata->sync_clock = hostdata->clock/2;
721 } else if(hostdata->clock > 50 && hostdata->clock <= 75) {
722 /* sync divider 1.5, async divider 3 */
723 DEBUG(("53c700: sync 1.5 async 3\n"));
724 NCR_700_writeb(SYNC_DIV_1_5, host, SBCL_REG);
725 NCR_700_writeb(ASYNC_DIV_3_0 | dcntl_extra, host, DCNTL_REG);
726 hostdata->sync_clock = hostdata->clock*2;
727 hostdata->sync_clock /= 3;
729 } else if(hostdata->clock > 37 && hostdata->clock <= 50) {
730 /* sync divider 1, async divider 2 */
731 DEBUG(("53c700: sync 1 async 2\n"));
732 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
733 NCR_700_writeb(ASYNC_DIV_2_0 | dcntl_extra, host, DCNTL_REG);
734 hostdata->sync_clock = hostdata->clock;
735 } else if(hostdata->clock > 25 && hostdata->clock <=37) {
736 /* sync divider 1, async divider 1.5 */
737 DEBUG(("53c700: sync 1 async 1.5\n"));
738 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
739 NCR_700_writeb(ASYNC_DIV_1_5 | dcntl_extra, host, DCNTL_REG);
740 hostdata->sync_clock = hostdata->clock;
742 DEBUG(("53c700: sync 1 async 1\n"));
743 NCR_700_writeb(SYNC_DIV_1_0, host, SBCL_REG);
744 NCR_700_writeb(ASYNC_DIV_1_0 | dcntl_extra, host, DCNTL_REG);
745 /* sync divider 1, async divider 1 */
746 hostdata->sync_clock = hostdata->clock;
748 /* Calculate the actual minimum period that can be supported
749 * by our synchronous clock speed. See the 710 manual for
750 * exact details of this calculation which is based on a
751 * setting of the SXFER register */
752 min_period = 1000*(4+min_xferp)/(4*hostdata->sync_clock);
753 hostdata->min_period = NCR_700_MIN_PERIOD;
754 if(min_period > NCR_700_MIN_PERIOD)
755 hostdata->min_period = min_period;
759 NCR_700_chip_reset(struct Scsi_Host *host)
761 struct NCR_700_Host_Parameters *hostdata =
762 (struct NCR_700_Host_Parameters *)host->hostdata[0];
763 if(hostdata->chip710) {
764 NCR_700_writeb(SOFTWARE_RESET_710, host, ISTAT_REG);
767 NCR_700_writeb(0, host, ISTAT_REG);
769 NCR_700_writeb(SOFTWARE_RESET, host, DCNTL_REG);
772 NCR_700_writeb(0, host, DCNTL_REG);
777 NCR_700_chip_setup(host);
780 /* The heart of the message processing engine is that the instruction
781 * immediately after the INT is the normal case (and so must be CLEAR
782 * ACK). If we want to do something else, we call that routine in
783 * scripts and set temp to be the normal case + 8 (skipping the CLEAR
784 * ACK) so that the routine returns correctly to resume its activity
787 process_extended_message(struct Scsi_Host *host,
788 struct NCR_700_Host_Parameters *hostdata,
789 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
791 __u32 resume_offset = dsp, temp = dsp + 8;
792 __u8 pun = 0xff, lun = 0xff;
795 pun = SCp->device->id;
796 lun = SCp->device->lun;
799 switch(hostdata->msgin[2]) {
801 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
802 struct scsi_target *starget = SCp->device->sdev_target;
803 __u8 period = hostdata->msgin[3];
804 __u8 offset = hostdata->msgin[4];
806 if(offset == 0 || period == 0) {
811 spi_offset(starget) = offset;
812 spi_period(starget) = period;
814 if(NCR_700_is_flag_set(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION)) {
815 spi_display_xfer_agreement(starget);
816 NCR_700_clear_flag(SCp->device, NCR_700_DEV_PRINT_SYNC_NEGOTIATION);
819 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
820 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
822 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
826 /* SDTR message out of the blue, reject it */
827 shost_printk(KERN_WARNING, host,
828 "Unexpected SDTR msg\n");
829 hostdata->msgout[0] = A_REJECT_MSG;
830 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
831 script_patch_16(hostdata->script, MessageCount, 1);
832 /* SendMsgOut returns, so set up the return
834 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
839 printk(KERN_INFO "scsi%d: (%d:%d), Unsolicited WDTR after CMD, Rejecting\n",
840 host->host_no, pun, lun);
841 hostdata->msgout[0] = A_REJECT_MSG;
842 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
843 script_patch_16(hostdata->script, MessageCount, 1);
844 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
849 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
850 host->host_no, pun, lun,
851 NCR_700_phase[(dsps & 0xf00) >> 8]);
852 spi_print_msg(hostdata->msgin);
855 hostdata->msgout[0] = A_REJECT_MSG;
856 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
857 script_patch_16(hostdata->script, MessageCount, 1);
858 /* SendMsgOut returns, so set up the return
860 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
862 NCR_700_writel(temp, host, TEMP_REG);
863 return resume_offset;
867 process_message(struct Scsi_Host *host, struct NCR_700_Host_Parameters *hostdata,
868 struct scsi_cmnd *SCp, __u32 dsp, __u32 dsps)
870 /* work out where to return to */
871 __u32 temp = dsp + 8, resume_offset = dsp;
872 __u8 pun = 0xff, lun = 0xff;
875 pun = SCp->device->id;
876 lun = SCp->device->lun;
880 printk("scsi%d (%d:%d): message %s: ", host->host_no, pun, lun,
881 NCR_700_phase[(dsps & 0xf00) >> 8]);
882 spi_print_msg(hostdata->msgin);
886 switch(hostdata->msgin[0]) {
889 resume_offset = process_extended_message(host, hostdata, SCp,
894 if(SCp != NULL && NCR_700_is_flag_set(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION)) {
895 /* Rejected our sync negotiation attempt */
896 spi_period(SCp->device->sdev_target) =
897 spi_offset(SCp->device->sdev_target) = 0;
898 NCR_700_set_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
899 NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
900 } else if(SCp != NULL && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION) {
901 /* rejected our first simple tag message */
902 scmd_printk(KERN_WARNING, SCp,
903 "Rejected first tag queue attempt, turning off tag queueing\n");
904 /* we're done negotiating */
905 NCR_700_set_tag_neg_state(SCp->device, NCR_700_FINISHED_TAG_NEGOTIATION);
906 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
907 SCp->device->tagged_supported = 0;
908 scsi_deactivate_tcq(SCp->device, host->cmd_per_lun);
910 shost_printk(KERN_WARNING, host,
911 "(%d:%d) Unexpected REJECT Message %s\n",
913 NCR_700_phase[(dsps & 0xf00) >> 8]);
914 /* however, just ignore it */
918 case A_PARITY_ERROR_MSG:
919 printk(KERN_ERR "scsi%d (%d:%d) Parity Error!\n", host->host_no,
921 NCR_700_internal_bus_reset(host);
923 case A_SIMPLE_TAG_MSG:
924 printk(KERN_INFO "scsi%d (%d:%d) SIMPLE TAG %d %s\n", host->host_no,
925 pun, lun, hostdata->msgin[1],
926 NCR_700_phase[(dsps & 0xf00) >> 8]);
930 printk(KERN_INFO "scsi%d (%d:%d): Unexpected message %s: ",
931 host->host_no, pun, lun,
932 NCR_700_phase[(dsps & 0xf00) >> 8]);
934 spi_print_msg(hostdata->msgin);
937 hostdata->msgout[0] = A_REJECT_MSG;
938 dma_cache_sync(hostdata->msgout, 1, DMA_TO_DEVICE);
939 script_patch_16(hostdata->script, MessageCount, 1);
940 /* SendMsgOut returns, so set up the return
942 resume_offset = hostdata->pScript + Ent_SendMessageWithATN;
946 NCR_700_writel(temp, host, TEMP_REG);
947 /* set us up to receive another message */
948 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
949 return resume_offset;
953 process_script_interrupt(__u32 dsps, __u32 dsp, struct scsi_cmnd *SCp,
954 struct Scsi_Host *host,
955 struct NCR_700_Host_Parameters *hostdata)
957 __u32 resume_offset = 0;
958 __u8 pun = 0xff, lun=0xff;
961 pun = SCp->device->id;
962 lun = SCp->device->lun;
965 if(dsps == A_GOOD_STATUS_AFTER_STATUS) {
966 DEBUG((" COMMAND COMPLETE, status=%02x\n",
967 hostdata->status[0]));
968 /* OK, if TCQ still under negotiation, we now know it works */
969 if (NCR_700_get_tag_neg_state(SCp->device) == NCR_700_DURING_TAG_NEGOTIATION)
970 NCR_700_set_tag_neg_state(SCp->device,
971 NCR_700_FINISHED_TAG_NEGOTIATION);
973 /* check for contingent allegiance contitions */
974 if(status_byte(hostdata->status[0]) == CHECK_CONDITION ||
975 status_byte(hostdata->status[0]) == COMMAND_TERMINATED) {
976 struct NCR_700_command_slot *slot =
977 (struct NCR_700_command_slot *)SCp->host_scribble;
978 if(SCp->cmnd[0] == REQUEST_SENSE) {
979 /* OOPS: bad device, returning another
980 * contingent allegiance condition */
981 scmd_printk(KERN_ERR, SCp,
982 "broken device is looping in contingent allegiance: ignoring\n");
983 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
986 scsi_print_command(SCp);
987 printk(" cmd %p has status %d, requesting sense\n",
988 SCp, hostdata->status[0]);
990 /* we can destroy the command here
991 * because the contingent allegiance
992 * condition will cause a retry which
993 * will re-copy the command from the
994 * saved data_cmnd. We also unmap any
995 * data associated with the command
997 NCR_700_unmap(hostdata, SCp, slot);
999 SCp->cmnd[0] = REQUEST_SENSE;
1000 SCp->cmnd[1] = (SCp->device->lun & 0x7) << 5;
1003 SCp->cmnd[4] = sizeof(SCp->sense_buffer);
1006 /* Here's a quiet hack: the
1007 * REQUEST_SENSE command is six bytes,
1008 * so store a flag indicating that
1009 * this was an internal sense request
1010 * and the original status at the end
1012 SCp->cmnd[6] = NCR_700_INTERNAL_SENSE_MAGIC;
1013 SCp->cmnd[7] = hostdata->status[0];
1015 SCp->sc_data_direction = DMA_FROM_DEVICE;
1016 dma_sync_single_for_device(hostdata->dev, slot->pCmd,
1017 SCp->cmd_len, DMA_TO_DEVICE);
1018 SCp->request_bufflen = sizeof(SCp->sense_buffer);
1019 slot->dma_handle = dma_map_single(hostdata->dev, SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1020 slot->SG[0].ins = bS_to_host(SCRIPT_MOVE_DATA_IN | sizeof(SCp->sense_buffer));
1021 slot->SG[0].pAddr = bS_to_host(slot->dma_handle);
1022 slot->SG[1].ins = bS_to_host(SCRIPT_RETURN);
1023 slot->SG[1].pAddr = 0;
1024 slot->resume_offset = hostdata->pScript;
1025 dma_cache_sync(slot->SG, sizeof(slot->SG[0])*2, DMA_TO_DEVICE);
1026 dma_cache_sync(SCp->sense_buffer, sizeof(SCp->sense_buffer), DMA_FROM_DEVICE);
1028 /* queue the command for reissue */
1029 slot->state = NCR_700_SLOT_QUEUED;
1030 hostdata->state = NCR_700_HOST_FREE;
1031 hostdata->cmd = NULL;
1034 // Currently rely on the mid layer evaluation
1035 // of the tag queuing capability
1037 //if(status_byte(hostdata->status[0]) == GOOD &&
1038 // SCp->cmnd[0] == INQUIRY && SCp->use_sg == 0) {
1039 // /* Piggy back the tag queueing support
1040 // * on this command */
1041 // dma_sync_single_for_cpu(hostdata->dev,
1042 // slot->dma_handle,
1043 // SCp->request_bufflen,
1044 // DMA_FROM_DEVICE);
1045 // if(((char *)SCp->request_buffer)[7] & 0x02) {
1046 // scmd_printk(KERN_INFO, SCp,
1047 // "Enabling Tag Command Queuing\n");
1048 // hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1049 // NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1051 // NCR_700_clear_flag(SCp->device, NCR_700_DEV_BEGIN_TAG_QUEUEING);
1052 // hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1055 NCR_700_scsi_done(hostdata, SCp, hostdata->status[0]);
1057 } else if((dsps & 0xfffff0f0) == A_UNEXPECTED_PHASE) {
1058 __u8 i = (dsps & 0xf00) >> 8;
1060 scmd_printk(KERN_ERR, SCp, "UNEXPECTED PHASE %s (%s)\n",
1062 sbcl_to_string(NCR_700_readb(host, SBCL_REG)));
1063 scmd_printk(KERN_ERR, SCp, " len = %d, cmd =",
1065 scsi_print_command(SCp);
1067 NCR_700_internal_bus_reset(host);
1068 } else if((dsps & 0xfffff000) == A_FATAL) {
1069 int i = (dsps & 0xfff);
1071 printk(KERN_ERR "scsi%d: (%d:%d) FATAL ERROR: %s\n",
1072 host->host_no, pun, lun, NCR_700_fatal_messages[i]);
1073 if(dsps == A_FATAL_ILLEGAL_MSG_LENGTH) {
1074 printk(KERN_ERR " msg begins %02x %02x\n",
1075 hostdata->msgin[0], hostdata->msgin[1]);
1077 NCR_700_internal_bus_reset(host);
1078 } else if((dsps & 0xfffff0f0) == A_DISCONNECT) {
1079 #ifdef NCR_700_DEBUG
1080 __u8 i = (dsps & 0xf00) >> 8;
1082 printk("scsi%d: (%d:%d), DISCONNECTED (%d) %s\n",
1083 host->host_no, pun, lun,
1084 i, NCR_700_phase[i]);
1086 save_for_reselection(hostdata, SCp, dsp);
1088 } else if(dsps == A_RESELECTION_IDENTIFIED) {
1090 struct NCR_700_command_slot *slot;
1091 __u8 reselection_id = hostdata->reselection_id;
1092 struct scsi_device *SDp;
1094 lun = hostdata->msgin[0] & 0x1f;
1096 hostdata->reselection_id = 0xff;
1097 DEBUG(("scsi%d: (%d:%d) RESELECTED!\n",
1098 host->host_no, reselection_id, lun));
1099 /* clear the reselection indicator */
1100 SDp = __scsi_device_lookup(host, 0, reselection_id, lun);
1101 if(unlikely(SDp == NULL)) {
1102 printk(KERN_ERR "scsi%d: (%d:%d) HAS NO device\n",
1103 host->host_no, reselection_id, lun);
1106 if(hostdata->msgin[1] == A_SIMPLE_TAG_MSG) {
1107 struct scsi_cmnd *SCp = scsi_find_tag(SDp, hostdata->msgin[2]);
1108 if(unlikely(SCp == NULL)) {
1109 printk(KERN_ERR "scsi%d: (%d:%d) no saved request for tag %d\n",
1110 host->host_no, reselection_id, lun, hostdata->msgin[2]);
1114 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1115 DDEBUG(KERN_DEBUG, SDp,
1116 "reselection is tag %d, slot %p(%d)\n",
1117 hostdata->msgin[2], slot, slot->tag);
1119 struct scsi_cmnd *SCp = scsi_find_tag(SDp, SCSI_NO_TAG);
1120 if(unlikely(SCp == NULL)) {
1121 sdev_printk(KERN_ERR, SDp,
1122 "no saved request for untagged cmd\n");
1125 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1129 printk(KERN_ERR "scsi%d: (%d:%d) RESELECTED but no saved command (MSG = %02x %02x %02x)!!\n",
1130 host->host_no, reselection_id, lun,
1131 hostdata->msgin[0], hostdata->msgin[1],
1132 hostdata->msgin[2]);
1134 if(hostdata->state != NCR_700_HOST_BUSY)
1135 printk(KERN_ERR "scsi%d: FATAL, host not busy during valid reselection!\n",
1137 resume_offset = slot->resume_offset;
1138 hostdata->cmd = slot->cmnd;
1140 /* re-patch for this command */
1141 script_patch_32_abs(hostdata->script, CommandAddress,
1143 script_patch_16(hostdata->script,
1144 CommandCount, slot->cmnd->cmd_len);
1145 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1146 to32bit(&slot->pSG[0].ins));
1148 /* Note: setting SXFER only works if we're
1149 * still in the MESSAGE phase, so it is vital
1150 * that ACK is still asserted when we process
1151 * the reselection message. The resume offset
1152 * should therefore always clear ACK */
1153 NCR_700_writeb(NCR_700_get_SXFER(hostdata->cmd->device),
1155 dma_cache_sync(hostdata->msgin,
1156 MSG_ARRAY_SIZE, DMA_FROM_DEVICE);
1157 dma_cache_sync(hostdata->msgout,
1158 MSG_ARRAY_SIZE, DMA_TO_DEVICE);
1159 /* I'm just being paranoid here, the command should
1160 * already have been flushed from the cache */
1161 dma_cache_sync(slot->cmnd->cmnd,
1162 slot->cmnd->cmd_len, DMA_TO_DEVICE);
1167 } else if(dsps == A_RESELECTED_DURING_SELECTION) {
1169 /* This section is full of debugging code because I've
1170 * never managed to reach it. I think what happens is
1171 * that, because the 700 runs with selection
1172 * interrupts enabled the whole time that we take a
1173 * selection interrupt before we manage to get to the
1174 * reselected script interrupt */
1176 __u8 reselection_id = NCR_700_readb(host, SFBR_REG);
1177 struct NCR_700_command_slot *slot;
1179 /* Take out our own ID */
1180 reselection_id &= ~(1<<host->this_id);
1182 /* I've never seen this happen, so keep this as a printk rather
1184 printk(KERN_INFO "scsi%d: (%d:%d) RESELECTION DURING SELECTION, dsp=%08x[%04x] state=%d, count=%d\n",
1185 host->host_no, reselection_id, lun, dsp, dsp - hostdata->pScript, hostdata->state, hostdata->command_slot_count);
1188 /* FIXME: DEBUGGING CODE */
1189 __u32 SG = (__u32)bS_to_cpu(hostdata->script[A_SGScriptStartAddress_used[0]]);
1192 for(i=0; i< NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1193 if(SG >= to32bit(&hostdata->slots[i].pSG[0])
1194 && SG <= to32bit(&hostdata->slots[i].pSG[NCR_700_SG_SEGMENTS]))
1197 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);
1198 SCp = hostdata->slots[i].cmnd;
1202 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1203 /* change slot from busy to queued to redo command */
1204 slot->state = NCR_700_SLOT_QUEUED;
1206 hostdata->cmd = NULL;
1208 if(reselection_id == 0) {
1209 if(hostdata->reselection_id == 0xff) {
1210 printk(KERN_ERR "scsi%d: Invalid reselection during selection!!\n", host->host_no);
1213 printk(KERN_ERR "scsi%d: script reselected and we took a selection interrupt\n",
1215 reselection_id = hostdata->reselection_id;
1219 /* convert to real ID */
1220 reselection_id = bitmap_to_number(reselection_id);
1222 hostdata->reselection_id = reselection_id;
1223 /* just in case we have a stale simple tag message, clear it */
1224 hostdata->msgin[1] = 0;
1225 dma_cache_sync(hostdata->msgin,
1226 MSG_ARRAY_SIZE, DMA_BIDIRECTIONAL);
1227 if(hostdata->tag_negotiated & (1<<reselection_id)) {
1228 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1230 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1232 } else if(dsps == A_COMPLETED_SELECTION_AS_TARGET) {
1233 /* we've just disconnected from the bus, do nothing since
1234 * a return here will re-run the queued command slot
1235 * that may have been interrupted by the initial selection */
1236 DEBUG((" SELECTION COMPLETED\n"));
1237 } else if((dsps & 0xfffff0f0) == A_MSG_IN) {
1238 resume_offset = process_message(host, hostdata, SCp,
1240 } else if((dsps & 0xfffff000) == 0) {
1241 __u8 i = (dsps & 0xf0) >> 4, j = (dsps & 0xf00) >> 8;
1242 printk(KERN_ERR "scsi%d: (%d:%d), unhandled script condition %s %s at %04x\n",
1243 host->host_no, pun, lun, NCR_700_condition[i],
1244 NCR_700_phase[j], dsp - hostdata->pScript);
1246 scsi_print_command(SCp);
1249 for(i = 0; i < SCp->use_sg + 1; i++) {
1250 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);
1254 NCR_700_internal_bus_reset(host);
1255 } else if((dsps & 0xfffff000) == A_DEBUG_INTERRUPT) {
1256 printk(KERN_NOTICE "scsi%d (%d:%d) DEBUG INTERRUPT %d AT %08x[%04x], continuing\n",
1257 host->host_no, pun, lun, dsps & 0xfff, dsp, dsp - hostdata->pScript);
1258 resume_offset = dsp;
1260 printk(KERN_ERR "scsi%d: (%d:%d), unidentified script interrupt 0x%x at %04x\n",
1261 host->host_no, pun, lun, dsps, dsp - hostdata->pScript);
1262 NCR_700_internal_bus_reset(host);
1264 return resume_offset;
1267 /* We run the 53c700 with selection interrupts always enabled. This
1268 * means that the chip may be selected as soon as the bus frees. On a
1269 * busy bus, this can be before the scripts engine finishes its
1270 * processing. Therefore, part of the selection processing has to be
1271 * to find out what the scripts engine is doing and complete the
1272 * function if necessary (i.e. process the pending disconnect or save
1273 * the interrupted initial selection */
1275 process_selection(struct Scsi_Host *host, __u32 dsp)
1277 __u8 id = 0; /* Squash compiler warning */
1279 __u32 resume_offset = 0;
1280 struct NCR_700_Host_Parameters *hostdata =
1281 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1282 struct scsi_cmnd *SCp = hostdata->cmd;
1285 for(count = 0; count < 5; count++) {
1286 id = NCR_700_readb(host, hostdata->chip710 ?
1287 CTEST9_REG : SFBR_REG);
1289 /* Take out our own ID */
1290 id &= ~(1<<host->this_id);
1295 sbcl = NCR_700_readb(host, SBCL_REG);
1296 if((sbcl & SBCL_IO) == 0) {
1297 /* mark as having been selected rather than reselected */
1300 /* convert to real ID */
1301 hostdata->reselection_id = id = bitmap_to_number(id);
1302 DEBUG(("scsi%d: Reselected by %d\n",
1303 host->host_no, id));
1305 if(hostdata->state == NCR_700_HOST_BUSY && SCp != NULL) {
1306 struct NCR_700_command_slot *slot =
1307 (struct NCR_700_command_slot *)SCp->host_scribble;
1308 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));
1310 switch(dsp - hostdata->pScript) {
1311 case Ent_Disconnect1:
1312 case Ent_Disconnect2:
1313 save_for_reselection(hostdata, SCp, Ent_Disconnect2 + hostdata->pScript);
1315 case Ent_Disconnect3:
1316 case Ent_Disconnect4:
1317 save_for_reselection(hostdata, SCp, Ent_Disconnect4 + hostdata->pScript);
1319 case Ent_Disconnect5:
1320 case Ent_Disconnect6:
1321 save_for_reselection(hostdata, SCp, Ent_Disconnect6 + hostdata->pScript);
1323 case Ent_Disconnect7:
1324 case Ent_Disconnect8:
1325 save_for_reselection(hostdata, SCp, Ent_Disconnect8 + hostdata->pScript);
1329 process_script_interrupt(A_GOOD_STATUS_AFTER_STATUS, dsp, SCp, host, hostdata);
1333 slot->state = NCR_700_SLOT_QUEUED;
1337 hostdata->state = NCR_700_HOST_BUSY;
1338 hostdata->cmd = NULL;
1339 /* clear any stale simple tag message */
1340 hostdata->msgin[1] = 0;
1341 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1345 /* Selected as target, Ignore */
1346 resume_offset = hostdata->pScript + Ent_SelectedAsTarget;
1347 } else if(hostdata->tag_negotiated & (1<<id)) {
1348 resume_offset = hostdata->pScript + Ent_GetReselectionWithTag;
1350 resume_offset = hostdata->pScript + Ent_GetReselectionData;
1352 return resume_offset;
1356 NCR_700_clear_fifo(struct Scsi_Host *host) {
1357 const struct NCR_700_Host_Parameters *hostdata
1358 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1359 if(hostdata->chip710) {
1360 NCR_700_writeb(CLR_FIFO_710, host, CTEST8_REG);
1362 NCR_700_writeb(CLR_FIFO, host, DFIFO_REG);
1367 NCR_700_flush_fifo(struct Scsi_Host *host) {
1368 const struct NCR_700_Host_Parameters *hostdata
1369 = (struct NCR_700_Host_Parameters *)host->hostdata[0];
1370 if(hostdata->chip710) {
1371 NCR_700_writeb(FLUSH_DMA_FIFO_710, host, CTEST8_REG);
1373 NCR_700_writeb(0, host, CTEST8_REG);
1375 NCR_700_writeb(FLUSH_DMA_FIFO, host, DFIFO_REG);
1377 NCR_700_writeb(0, host, DFIFO_REG);
1382 /* The queue lock with interrupts disabled must be held on entry to
1385 NCR_700_start_command(struct scsi_cmnd *SCp)
1387 struct NCR_700_command_slot *slot =
1388 (struct NCR_700_command_slot *)SCp->host_scribble;
1389 struct NCR_700_Host_Parameters *hostdata =
1390 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1391 __u16 count = 1; /* for IDENTIFY message */
1393 if(hostdata->state != NCR_700_HOST_FREE) {
1394 /* keep this inside the lock to close the race window where
1395 * the running command finishes on another CPU while we don't
1396 * change the state to queued on this one */
1397 slot->state = NCR_700_SLOT_QUEUED;
1399 DEBUG(("scsi%d: host busy, queueing command %p, slot %p\n",
1400 SCp->device->host->host_no, slot->cmnd, slot));
1403 hostdata->state = NCR_700_HOST_BUSY;
1404 hostdata->cmd = SCp;
1405 slot->state = NCR_700_SLOT_BUSY;
1406 /* keep interrupts disabled until we have the command correctly
1407 * set up so we cannot take a selection interrupt */
1409 hostdata->msgout[0] = NCR_700_identify(SCp->cmnd[0] != REQUEST_SENSE,
1411 /* for INQUIRY or REQUEST_SENSE commands, we cannot be sure
1412 * if the negotiated transfer parameters still hold, so
1413 * always renegotiate them */
1414 if(SCp->cmnd[0] == INQUIRY || SCp->cmnd[0] == REQUEST_SENSE) {
1415 NCR_700_clear_flag(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC);
1418 /* REQUEST_SENSE is asking for contingent I_T_L(_Q) status.
1419 * If a contingent allegiance condition exists, the device
1420 * will refuse all tags, so send the request sense as untagged
1422 if((hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1423 && (slot->tag != SCSI_NO_TAG && SCp->cmnd[0] != REQUEST_SENSE)) {
1424 count += scsi_populate_tag_msg(SCp, &hostdata->msgout[count]);
1427 if(hostdata->fast &&
1428 NCR_700_is_flag_clear(SCp->device, NCR_700_DEV_NEGOTIATED_SYNC)) {
1429 count += spi_populate_sync_msg(&hostdata->msgout[count],
1430 spi_period(SCp->device->sdev_target),
1431 spi_offset(SCp->device->sdev_target));
1432 NCR_700_set_flag(SCp->device, NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
1435 script_patch_16(hostdata->script, MessageCount, count);
1438 script_patch_ID(hostdata->script,
1439 Device_ID, 1<<scmd_id(SCp));
1441 script_patch_32_abs(hostdata->script, CommandAddress,
1443 script_patch_16(hostdata->script, CommandCount, SCp->cmd_len);
1444 /* finally plumb the beginning of the SG list into the script
1446 script_patch_32_abs(hostdata->script, SGScriptStartAddress,
1447 to32bit(&slot->pSG[0].ins));
1448 NCR_700_clear_fifo(SCp->device->host);
1450 if(slot->resume_offset == 0)
1451 slot->resume_offset = hostdata->pScript;
1452 /* now perform all the writebacks and invalidates */
1453 dma_cache_sync(hostdata->msgout, count, DMA_TO_DEVICE);
1454 dma_cache_sync(hostdata->msgin, MSG_ARRAY_SIZE,
1456 dma_cache_sync(SCp->cmnd, SCp->cmd_len, DMA_TO_DEVICE);
1457 dma_cache_sync(hostdata->status, 1, DMA_FROM_DEVICE);
1459 /* set the synchronous period/offset */
1460 NCR_700_writeb(NCR_700_get_SXFER(SCp->device),
1461 SCp->device->host, SXFER_REG);
1462 NCR_700_writel(slot->temp, SCp->device->host, TEMP_REG);
1463 NCR_700_writel(slot->resume_offset, SCp->device->host, DSP_REG);
1469 NCR_700_intr(int irq, void *dev_id, struct pt_regs *regs)
1471 struct Scsi_Host *host = (struct Scsi_Host *)dev_id;
1472 struct NCR_700_Host_Parameters *hostdata =
1473 (struct NCR_700_Host_Parameters *)host->hostdata[0];
1475 __u32 resume_offset = 0;
1476 __u8 pun = 0xff, lun = 0xff;
1477 unsigned long flags;
1480 /* Use the host lock to serialise acess to the 53c700
1481 * hardware. Note: In future, we may need to take the queue
1482 * lock to enter the done routines. When that happens, we
1483 * need to ensure that for this driver, the host lock and the
1484 * queue lock point to the same thing. */
1485 spin_lock_irqsave(host->host_lock, flags);
1486 if((istat = NCR_700_readb(host, ISTAT_REG))
1487 & (SCSI_INT_PENDING | DMA_INT_PENDING)) {
1489 __u8 sstat0 = 0, dstat = 0;
1491 struct scsi_cmnd *SCp = hostdata->cmd;
1492 enum NCR_700_Host_State state;
1495 state = hostdata->state;
1496 SCp = hostdata->cmd;
1498 if(istat & SCSI_INT_PENDING) {
1501 sstat0 = NCR_700_readb(host, SSTAT0_REG);
1504 if(istat & DMA_INT_PENDING) {
1507 dstat = NCR_700_readb(host, DSTAT_REG);
1510 dsps = NCR_700_readl(host, DSPS_REG);
1511 dsp = NCR_700_readl(host, DSP_REG);
1513 DEBUG(("scsi%d: istat %02x sstat0 %02x dstat %02x dsp %04x[%08x] dsps 0x%x\n",
1514 host->host_no, istat, sstat0, dstat,
1515 (dsp - (__u32)(hostdata->pScript))/4,
1519 pun = SCp->device->id;
1520 lun = SCp->device->lun;
1523 if(sstat0 & SCSI_RESET_DETECTED) {
1524 struct scsi_device *SDp;
1527 hostdata->state = NCR_700_HOST_BUSY;
1529 printk(KERN_ERR "scsi%d: Bus Reset detected, executing command %p, slot %p, dsp %08x[%04x]\n",
1530 host->host_no, SCp, SCp == NULL ? NULL : SCp->host_scribble, dsp, dsp - hostdata->pScript);
1532 scsi_report_bus_reset(host, 0);
1534 /* clear all the negotiated parameters */
1535 __shost_for_each_device(SDp, host)
1536 SDp->hostdata = NULL;
1538 /* clear all the slots and their pending commands */
1539 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1540 struct scsi_cmnd *SCp;
1541 struct NCR_700_command_slot *slot =
1542 &hostdata->slots[i];
1544 if(slot->state == NCR_700_SLOT_FREE)
1548 printk(KERN_ERR " failing command because of reset, slot %p, cmnd %p\n",
1550 free_slot(slot, hostdata);
1551 SCp->host_scribble = NULL;
1552 NCR_700_set_depth(SCp->device, 0);
1553 /* NOTE: deadlock potential here: we
1554 * rely on mid-layer guarantees that
1555 * scsi_done won't try to issue the
1556 * command again otherwise we'll
1558 * hostdata->state_lock */
1559 SCp->result = DID_RESET << 16;
1560 SCp->scsi_done(SCp);
1563 NCR_700_chip_setup(host);
1565 hostdata->state = NCR_700_HOST_FREE;
1566 hostdata->cmd = NULL;
1567 /* signal back if this was an eh induced reset */
1568 if(hostdata->eh_complete != NULL)
1569 complete(hostdata->eh_complete);
1571 } else if(sstat0 & SELECTION_TIMEOUT) {
1572 DEBUG(("scsi%d: (%d:%d) selection timeout\n",
1573 host->host_no, pun, lun));
1574 NCR_700_scsi_done(hostdata, SCp, DID_NO_CONNECT<<16);
1575 } else if(sstat0 & PHASE_MISMATCH) {
1576 struct NCR_700_command_slot *slot = (SCp == NULL) ? NULL :
1577 (struct NCR_700_command_slot *)SCp->host_scribble;
1579 if(dsp == Ent_SendMessage + 8 + hostdata->pScript) {
1580 /* It wants to reply to some part of
1582 #ifdef NCR_700_DEBUG
1583 __u32 temp = NCR_700_readl(host, TEMP_REG);
1584 int count = (hostdata->script[Ent_SendMessage/4] & 0xffffff) - ((NCR_700_readl(host, DBC_REG) & 0xffffff) + NCR_700_data_residual(host));
1585 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)));
1587 resume_offset = hostdata->pScript + Ent_SendMessagePhaseMismatch;
1588 } else if(dsp >= to32bit(&slot->pSG[0].ins) &&
1589 dsp <= to32bit(&slot->pSG[NCR_700_SG_SEGMENTS].ins)) {
1590 int data_transfer = NCR_700_readl(host, DBC_REG) & 0xffffff;
1591 int SGcount = (dsp - to32bit(&slot->pSG[0].ins))/sizeof(struct NCR_700_SG_List);
1592 int residual = NCR_700_data_residual(host);
1594 #ifdef NCR_700_DEBUG
1595 __u32 naddr = NCR_700_readl(host, DNAD_REG);
1597 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x\n",
1598 host->host_no, pun, lun,
1599 SGcount, data_transfer);
1600 scsi_print_command(SCp);
1602 printk("scsi%d: (%d:%d) Expected phase mismatch in slot->SG[%d], transferred 0x%x, residual %d\n",
1603 host->host_no, pun, lun,
1604 SGcount, data_transfer, residual);
1607 data_transfer += residual;
1609 if(data_transfer != 0) {
1615 count = (bS_to_cpu(slot->SG[SGcount].ins) & 0x00ffffff);
1616 DEBUG(("DATA TRANSFER MISMATCH, count = %d, transferred %d\n", count, count-data_transfer));
1617 slot->SG[SGcount].ins &= bS_to_host(0xff000000);
1618 slot->SG[SGcount].ins |= bS_to_host(data_transfer);
1619 pAddr = bS_to_cpu(slot->SG[SGcount].pAddr);
1620 pAddr += (count - data_transfer);
1621 #ifdef NCR_700_DEBUG
1622 if(pAddr != naddr) {
1623 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);
1626 slot->SG[SGcount].pAddr = bS_to_host(pAddr);
1628 /* set the executed moves to nops */
1629 for(i=0; i<SGcount; i++) {
1630 slot->SG[i].ins = bS_to_host(SCRIPT_NOP);
1631 slot->SG[i].pAddr = 0;
1633 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1634 /* and pretend we disconnected after
1635 * the command phase */
1636 resume_offset = hostdata->pScript + Ent_MsgInDuringData;
1637 /* make sure all the data is flushed */
1638 NCR_700_flush_fifo(host);
1640 __u8 sbcl = NCR_700_readb(host, SBCL_REG);
1641 printk(KERN_ERR "scsi%d: (%d:%d) phase mismatch at %04x, phase %s\n",
1642 host->host_no, pun, lun, dsp - hostdata->pScript, sbcl_to_string(sbcl));
1643 NCR_700_internal_bus_reset(host);
1646 } else if(sstat0 & SCSI_GROSS_ERROR) {
1647 printk(KERN_ERR "scsi%d: (%d:%d) GROSS ERROR\n",
1648 host->host_no, pun, lun);
1649 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1650 } else if(sstat0 & PARITY_ERROR) {
1651 printk(KERN_ERR "scsi%d: (%d:%d) PARITY ERROR\n",
1652 host->host_no, pun, lun);
1653 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1654 } else if(dstat & SCRIPT_INT_RECEIVED) {
1655 DEBUG(("scsi%d: (%d:%d) ====>SCRIPT INTERRUPT<====\n",
1656 host->host_no, pun, lun));
1657 resume_offset = process_script_interrupt(dsps, dsp, SCp, host, hostdata);
1658 } else if(dstat & (ILGL_INST_DETECTED)) {
1659 printk(KERN_ERR "scsi%d: (%d:%d) Illegal Instruction detected at 0x%08x[0x%x]!!!\n"
1660 " Please email James.Bottomley@HansenPartnership.com with the details\n",
1661 host->host_no, pun, lun,
1662 dsp, dsp - hostdata->pScript);
1663 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1664 } else if(dstat & (WATCH_DOG_INTERRUPT|ABORTED)) {
1665 printk(KERN_ERR "scsi%d: (%d:%d) serious DMA problem, dstat=%02x\n",
1666 host->host_no, pun, lun, dstat);
1667 NCR_700_scsi_done(hostdata, SCp, DID_ERROR<<16);
1671 /* NOTE: selection interrupt processing MUST occur
1672 * after script interrupt processing to correctly cope
1673 * with the case where we process a disconnect and
1674 * then get reselected before we process the
1676 if(sstat0 & SELECTED) {
1677 /* FIXME: It currently takes at least FOUR
1678 * interrupts to complete a command that
1679 * disconnects: one for the disconnect, one
1680 * for the reselection, one to get the
1681 * reselection data and one to complete the
1682 * command. If we guess the reselected
1683 * command here and prepare it, we only need
1684 * to get a reselection data interrupt if we
1685 * guessed wrongly. Since the interrupt
1686 * overhead is much greater than the command
1687 * setup, this would be an efficient
1688 * optimisation particularly as we probably
1689 * only have one outstanding command on a
1690 * target most of the time */
1692 resume_offset = process_selection(host, dsp);
1699 if(hostdata->state != NCR_700_HOST_BUSY) {
1700 printk(KERN_ERR "scsi%d: Driver error: resume at 0x%08x [0x%04x] with non busy host!\n",
1701 host->host_no, resume_offset, resume_offset - hostdata->pScript);
1702 hostdata->state = NCR_700_HOST_BUSY;
1705 DEBUG(("Attempting to resume at %x\n", resume_offset));
1706 NCR_700_clear_fifo(host);
1707 NCR_700_writel(resume_offset, host, DSP_REG);
1709 /* There is probably a technical no-no about this: If we're a
1710 * shared interrupt and we got this interrupt because the
1711 * other device needs servicing not us, we're still going to
1712 * check our queued commands here---of course, there shouldn't
1713 * be any outstanding.... */
1714 if(hostdata->state == NCR_700_HOST_FREE) {
1717 for(i = 0; i < NCR_700_COMMAND_SLOTS_PER_HOST; i++) {
1718 /* fairness: always run the queue from the last
1719 * position we left off */
1720 int j = (i + hostdata->saved_slot_position)
1721 % NCR_700_COMMAND_SLOTS_PER_HOST;
1723 if(hostdata->slots[j].state != NCR_700_SLOT_QUEUED)
1725 if(NCR_700_start_command(hostdata->slots[j].cmnd)) {
1726 DEBUG(("scsi%d: Issuing saved command slot %p, cmd %p\t\n",
1727 host->host_no, &hostdata->slots[j],
1728 hostdata->slots[j].cmnd));
1729 hostdata->saved_slot_position = j + 1;
1736 spin_unlock_irqrestore(host->host_lock, flags);
1737 return IRQ_RETVAL(handled);
1741 NCR_700_queuecommand(struct scsi_cmnd *SCp, void (*done)(struct scsi_cmnd *))
1743 struct NCR_700_Host_Parameters *hostdata =
1744 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1746 enum dma_data_direction direction;
1747 struct NCR_700_command_slot *slot;
1749 if(hostdata->command_slot_count >= NCR_700_COMMAND_SLOTS_PER_HOST) {
1750 /* We're over our allocation, this should never happen
1751 * since we report the max allocation to the mid layer */
1752 printk(KERN_WARNING "scsi%d: Command depth has gone over queue depth\n", SCp->device->host->host_no);
1755 /* check for untagged commands. We cannot have any outstanding
1756 * commands if we accept them. Commands could be untagged because:
1758 * - The tag negotiated bitmap is clear
1759 * - The blk layer sent and untagged command
1761 if(NCR_700_get_depth(SCp->device) != 0
1762 && (!(hostdata->tag_negotiated & (1<<scmd_id(SCp)))
1763 || !blk_rq_tagged(SCp->request))) {
1764 CDEBUG(KERN_ERR, SCp, "has non zero depth %d\n",
1765 NCR_700_get_depth(SCp->device));
1766 return SCSI_MLQUEUE_DEVICE_BUSY;
1768 if(NCR_700_get_depth(SCp->device) >= SCp->device->queue_depth) {
1769 CDEBUG(KERN_ERR, SCp, "has max tag depth %d\n",
1770 NCR_700_get_depth(SCp->device));
1771 return SCSI_MLQUEUE_DEVICE_BUSY;
1773 NCR_700_set_depth(SCp->device, NCR_700_get_depth(SCp->device) + 1);
1775 /* begin the command here */
1776 /* no need to check for NULL, test for command_slot_count above
1777 * ensures a slot is free */
1778 slot = find_empty_slot(hostdata);
1782 SCp->scsi_done = done;
1783 SCp->host_scribble = (unsigned char *)slot;
1784 SCp->SCp.ptr = NULL;
1785 SCp->SCp.buffer = NULL;
1787 #ifdef NCR_700_DEBUG
1788 printk("53c700: scsi%d, command ", SCp->device->host->host_no);
1789 scsi_print_command(SCp);
1791 if(blk_rq_tagged(SCp->request)
1792 && (hostdata->tag_negotiated &(1<<scmd_id(SCp))) == 0
1793 && NCR_700_get_tag_neg_state(SCp->device) == NCR_700_START_TAG_NEGOTIATION) {
1794 scmd_printk(KERN_ERR, SCp, "Enabling Tag Command Queuing\n");
1795 hostdata->tag_negotiated |= (1<<scmd_id(SCp));
1796 NCR_700_set_tag_neg_state(SCp->device, NCR_700_DURING_TAG_NEGOTIATION);
1799 /* here we may have to process an untagged command. The gate
1800 * above ensures that this will be the only one outstanding,
1801 * so clear the tag negotiated bit.
1803 * FIXME: This will royally screw up on multiple LUN devices
1805 if(!blk_rq_tagged(SCp->request)
1806 && (hostdata->tag_negotiated &(1<<scmd_id(SCp)))) {
1807 scmd_printk(KERN_INFO, SCp, "Disabling Tag Command Queuing\n");
1808 hostdata->tag_negotiated &= ~(1<<scmd_id(SCp));
1811 if((hostdata->tag_negotiated &(1<<scmd_id(SCp)))
1812 && scsi_get_tag_type(SCp->device)) {
1813 slot->tag = SCp->request->tag;
1814 CDEBUG(KERN_DEBUG, SCp, "sending out tag %d, slot %p\n",
1817 slot->tag = SCSI_NO_TAG;
1818 /* must populate current_cmnd for scsi_find_tag to work */
1819 SCp->device->current_cmnd = SCp;
1821 /* sanity check: some of the commands generated by the mid-layer
1822 * have an eccentric idea of their sc_data_direction */
1823 if(!SCp->use_sg && !SCp->request_bufflen
1824 && SCp->sc_data_direction != DMA_NONE) {
1825 #ifdef NCR_700_DEBUG
1826 printk("53c700: Command");
1827 scsi_print_command(SCp);
1828 printk("Has wrong data direction %d\n", SCp->sc_data_direction);
1830 SCp->sc_data_direction = DMA_NONE;
1833 switch (SCp->cmnd[0]) {
1835 /* clear the internal sense magic */
1839 /* OK, get it from the command */
1840 switch(SCp->sc_data_direction) {
1841 case DMA_BIDIRECTIONAL:
1843 printk(KERN_ERR "53c700: Unknown command for data direction ");
1844 scsi_print_command(SCp);
1851 case DMA_FROM_DEVICE:
1852 move_ins = SCRIPT_MOVE_DATA_IN;
1855 move_ins = SCRIPT_MOVE_DATA_OUT;
1860 /* now build the scatter gather list */
1861 direction = SCp->sc_data_direction;
1865 dma_addr_t vPtr = 0;
1869 sg_count = dma_map_sg(hostdata->dev, SCp->buffer,
1870 SCp->use_sg, direction);
1872 vPtr = dma_map_single(hostdata->dev,
1873 SCp->request_buffer,
1874 SCp->request_bufflen,
1876 count = SCp->request_bufflen;
1877 slot->dma_handle = vPtr;
1882 for(i = 0; i < sg_count; i++) {
1885 struct scatterlist *sg = SCp->buffer;
1887 vPtr = sg_dma_address(&sg[i]);
1888 count = sg_dma_len(&sg[i]);
1891 slot->SG[i].ins = bS_to_host(move_ins | count);
1892 DEBUG((" scatter block %d: move %d[%08x] from 0x%lx\n",
1893 i, count, slot->SG[i].ins, (unsigned long)vPtr));
1894 slot->SG[i].pAddr = bS_to_host(vPtr);
1896 slot->SG[i].ins = bS_to_host(SCRIPT_RETURN);
1897 slot->SG[i].pAddr = 0;
1898 dma_cache_sync(slot->SG, sizeof(slot->SG), DMA_TO_DEVICE);
1899 DEBUG((" SETTING %08lx to %x\n",
1900 (&slot->pSG[i].ins),
1903 slot->resume_offset = 0;
1904 slot->pCmd = dma_map_single(hostdata->dev, SCp->cmnd,
1905 sizeof(SCp->cmnd), DMA_TO_DEVICE);
1906 NCR_700_start_command(SCp);
1911 NCR_700_abort(struct scsi_cmnd * SCp)
1913 struct NCR_700_command_slot *slot;
1915 scmd_printk(KERN_INFO, SCp,
1916 "New error handler wants to abort command\n\t");
1917 scsi_print_command(SCp);
1919 slot = (struct NCR_700_command_slot *)SCp->host_scribble;
1922 /* no outstanding command to abort */
1924 if(SCp->cmnd[0] == TEST_UNIT_READY) {
1925 /* FIXME: This is because of a problem in the new
1926 * error handler. When it is in error recovery, it
1927 * will send a TUR to a device it thinks may still be
1928 * showing a problem. If the TUR isn't responded to,
1929 * it will abort it and mark the device off line.
1930 * Unfortunately, it does no other error recovery, so
1931 * this would leave us with an outstanding command
1932 * occupying a slot. Rather than allow this to
1933 * happen, we issue a bus reset to force all
1934 * outstanding commands to terminate here. */
1935 NCR_700_internal_bus_reset(SCp->device->host);
1936 /* still drop through and return failed */
1943 NCR_700_bus_reset(struct scsi_cmnd * SCp)
1945 DECLARE_COMPLETION(complete);
1946 struct NCR_700_Host_Parameters *hostdata =
1947 (struct NCR_700_Host_Parameters *)SCp->device->host->hostdata[0];
1949 scmd_printk(KERN_INFO, SCp,
1950 "New error handler wants BUS reset, cmd %p\n\t", SCp);
1951 scsi_print_command(SCp);
1953 /* In theory, eh_complete should always be null because the
1954 * eh is single threaded, but just in case we're handling a
1955 * reset via sg or something */
1956 spin_lock_irq(SCp->device->host->host_lock);
1957 while (hostdata->eh_complete != NULL) {
1958 spin_unlock_irq(SCp->device->host->host_lock);
1959 msleep_interruptible(100);
1960 spin_lock_irq(SCp->device->host->host_lock);
1963 hostdata->eh_complete = &complete;
1964 NCR_700_internal_bus_reset(SCp->device->host);
1966 spin_unlock_irq(SCp->device->host->host_lock);
1967 wait_for_completion(&complete);
1968 spin_lock_irq(SCp->device->host->host_lock);
1970 hostdata->eh_complete = NULL;
1971 /* Revalidate the transport parameters of the failing device */
1973 spi_schedule_dv_device(SCp->device);
1975 spin_unlock_irq(SCp->device->host->host_lock);
1980 NCR_700_host_reset(struct scsi_cmnd * SCp)
1982 scmd_printk(KERN_INFO, SCp, "New error handler wants HOST reset\n\t");
1983 scsi_print_command(SCp);
1985 spin_lock_irq(SCp->device->host->host_lock);
1987 NCR_700_internal_bus_reset(SCp->device->host);
1988 NCR_700_chip_reset(SCp->device->host);
1990 spin_unlock_irq(SCp->device->host->host_lock);
1996 NCR_700_set_period(struct scsi_target *STp, int period)
1998 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
1999 struct NCR_700_Host_Parameters *hostdata =
2000 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2005 if(period < hostdata->min_period)
2006 period = hostdata->min_period;
2008 spi_period(STp) = period;
2009 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2010 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2011 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2015 NCR_700_set_offset(struct scsi_target *STp, int offset)
2017 struct Scsi_Host *SHp = dev_to_shost(STp->dev.parent);
2018 struct NCR_700_Host_Parameters *hostdata =
2019 (struct NCR_700_Host_Parameters *)SHp->hostdata[0];
2020 int max_offset = hostdata->chip710
2021 ? NCR_710_MAX_OFFSET : NCR_700_MAX_OFFSET;
2026 if(offset > max_offset)
2027 offset = max_offset;
2029 /* if we're currently async, make sure the period is reasonable */
2030 if(spi_offset(STp) == 0 && (spi_period(STp) < hostdata->min_period ||
2031 spi_period(STp) > 0xff))
2032 spi_period(STp) = hostdata->min_period;
2034 spi_offset(STp) = offset;
2035 spi_flags(STp) &= ~(NCR_700_DEV_NEGOTIATED_SYNC |
2036 NCR_700_DEV_BEGIN_SYNC_NEGOTIATION);
2037 spi_flags(STp) |= NCR_700_DEV_PRINT_SYNC_NEGOTIATION;
2043 NCR_700_slave_configure(struct scsi_device *SDp)
2045 struct NCR_700_Host_Parameters *hostdata =
2046 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2048 /* to do here: allocate memory; build a queue_full list */
2049 if(SDp->tagged_supported) {
2050 scsi_set_tag_type(SDp, MSG_ORDERED_TAG);
2051 scsi_activate_tcq(SDp, NCR_700_DEFAULT_TAGS);
2052 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2054 /* initialise to default depth */
2055 scsi_adjust_queue_depth(SDp, 0, SDp->host->cmd_per_lun);
2057 if(hostdata->fast) {
2058 /* Find the correct offset and period via domain validation */
2059 if (!spi_initial_dv(SDp->sdev_target))
2062 spi_offset(SDp->sdev_target) = 0;
2063 spi_period(SDp->sdev_target) = 0;
2069 NCR_700_slave_destroy(struct scsi_device *SDp)
2071 /* to do here: deallocate memory */
2075 NCR_700_change_queue_depth(struct scsi_device *SDp, int depth)
2077 if (depth > NCR_700_MAX_TAGS)
2078 depth = NCR_700_MAX_TAGS;
2080 scsi_adjust_queue_depth(SDp, scsi_get_tag_type(SDp), depth);
2084 static int NCR_700_change_queue_type(struct scsi_device *SDp, int tag_type)
2086 int change_tag = ((tag_type ==0 && scsi_get_tag_type(SDp) != 0)
2087 || (tag_type != 0 && scsi_get_tag_type(SDp) == 0));
2088 struct NCR_700_Host_Parameters *hostdata =
2089 (struct NCR_700_Host_Parameters *)SDp->host->hostdata[0];
2091 scsi_set_tag_type(SDp, tag_type);
2093 /* We have a global (per target) flag to track whether TCQ is
2094 * enabled, so we'll be turning it off for the entire target here.
2095 * our tag algorithm will fail if we mix tagged and untagged commands,
2096 * so quiesce the device before doing this */
2098 scsi_target_quiesce(SDp->sdev_target);
2101 /* shift back to the default unqueued number of commands
2102 * (the user can still raise this) */
2103 scsi_deactivate_tcq(SDp, SDp->host->cmd_per_lun);
2104 hostdata->tag_negotiated &= ~(1 << sdev_id(SDp));
2106 /* Here, we cleared the negotiation flag above, so this
2107 * will force the driver to renegotiate */
2108 scsi_activate_tcq(SDp, SDp->queue_depth);
2110 NCR_700_set_tag_neg_state(SDp, NCR_700_START_TAG_NEGOTIATION);
2113 scsi_target_resume(SDp->sdev_target);
2119 NCR_700_show_active_tags(struct device *dev, struct device_attribute *attr, char *buf)
2121 struct scsi_device *SDp = to_scsi_device(dev);
2123 return snprintf(buf, 20, "%d\n", NCR_700_get_depth(SDp));
2126 static struct device_attribute NCR_700_active_tags_attr = {
2128 .name = "active_tags",
2131 .show = NCR_700_show_active_tags,
2134 STATIC struct device_attribute *NCR_700_dev_attrs[] = {
2135 &NCR_700_active_tags_attr,
2139 EXPORT_SYMBOL(NCR_700_detect);
2140 EXPORT_SYMBOL(NCR_700_release);
2141 EXPORT_SYMBOL(NCR_700_intr);
2143 static struct spi_function_template NCR_700_transport_functions = {
2144 .set_period = NCR_700_set_period,
2146 .set_offset = NCR_700_set_offset,
2150 static int __init NCR_700_init(void)
2152 NCR_700_transport_template = spi_attach_transport(&NCR_700_transport_functions);
2153 if(!NCR_700_transport_template)
2158 static void __exit NCR_700_exit(void)
2160 spi_release_transport(NCR_700_transport_template);
2163 module_init(NCR_700_init);
2164 module_exit(NCR_700_exit);
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