blob: 03dbe60c264aa5c4490654a9c528f59766b5faab [file] [log] [blame]
Roman Zippelc28bda22007-05-01 22:32:36 +02001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NCR 5380 generic driver routines. These should make it *trivial*
Roman Zippelc28bda22007-05-01 22:32:36 +02003 * to implement 5380 SCSI drivers under Linux with a non-trantor
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 * architecture.
5 *
6 * Note that these routines also work with NR53c400 family chips.
7 *
8 * Copyright 1993, Drew Eckhardt
Roman Zippelc28bda22007-05-01 22:32:36 +02009 * Visionary Computing
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * (Unix and Linux consulting and custom programming)
Roman Zippelc28bda22007-05-01 22:32:36 +020011 * drew@colorado.edu
Linus Torvalds1da177e2005-04-16 15:20:36 -070012 * +1 (303) 666-5836
13 *
Roman Zippelc28bda22007-05-01 22:32:36 +020014 * DISTRIBUTION RELEASE 6.
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
Roman Zippelc28bda22007-05-01 22:32:36 +020016 * For more information, please consult
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 *
18 * NCR 5380 Family
19 * SCSI Protocol Controller
20 * Databook
21 *
22 * NCR Microelectronics
23 * 1635 Aeroplaza Drive
24 * Colorado Springs, CO 80916
25 * 1+ (719) 578-3400
26 * 1+ (800) 334-5454
27 */
28
29/*
30 * ++roman: To port the 5380 driver to the Atari, I had to do some changes in
31 * this file, too:
32 *
33 * - Some of the debug statements were incorrect (undefined variables and the
34 * like). I fixed that.
35 *
36 * - In information_transfer(), I think a #ifdef was wrong. Looking at the
37 * possible DMA transfer size should also happen for REAL_DMA. I added this
38 * in the #if statement.
39 *
40 * - When using real DMA, information_transfer() should return in a DATAOUT
41 * phase after starting the DMA. It has nothing more to do.
42 *
43 * - The interrupt service routine should run main after end of DMA, too (not
44 * only after RESELECTION interrupts). Additionally, it should _not_ test
45 * for more interrupts after running main, since a DMA process may have
46 * been started and interrupts are turned on now. The new int could happen
47 * inside the execution of NCR5380_intr(), leading to recursive
48 * calls.
49 *
50 * - I've added a function merge_contiguous_buffers() that tries to
51 * merge scatter-gather buffers that are located at contiguous
52 * physical addresses and can be processed with the same DMA setup.
53 * Since most scatter-gather operations work on a page (4K) of
54 * 4 buffers (1K), in more than 90% of all cases three interrupts and
55 * DMA setup actions are saved.
56 *
57 * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA
58 * and USLEEP, because these were messing up readability and will never be
59 * needed for Atari SCSI.
Roman Zippelc28bda22007-05-01 22:32:36 +020060 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 * - I've revised the NCR5380_main() calling scheme (relax the 'main_running'
62 * stuff), and 'main' is executed in a bottom half if awoken by an
63 * interrupt.
64 *
65 * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..."
66 * constructs. In my eyes, this made the source rather unreadable, so I
67 * finally replaced that by the *_PRINTK() macros.
68 *
69 */
70
71/*
Roman Zippelc28bda22007-05-01 22:32:36 +020072 * Further development / testing that should be done :
73 * 1. Test linked command handling code after Eric is ready with
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 * the high level code.
75 */
db9dff32005-04-03 14:53:59 -050076#include <scsi/scsi_dbg.h>
Matthew Wilcox1abfd372005-12-15 16:22:01 -050077#include <scsi/scsi_transport_spi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070078
79#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +020080#define LIST(x, y) \
81 do { \
82 printk("LINE:%d Adding %p to %p\n", \
83 __LINE__, (void*)(x), (void*)(y)); \
84 if ((x) == (y)) \
85 udelay(5); \
86 } while (0)
87#define REMOVE(w, x, y, z) \
88 do { \
89 printk("LINE:%d Removing: %p->%p %p->%p \n", \
90 __LINE__, (void*)(w), (void*)(x), \
91 (void*)(y), (void*)(z)); \
92 if ((x) == (y)) \
93 udelay(5); \
94 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#else
96#define LIST(x,y)
97#define REMOVE(w,x,y,z)
98#endif
99
100#ifndef notyet
101#undef LINKED
102#endif
103
104/*
105 * Design
106 * Issues :
107 *
108 * The other Linux SCSI drivers were written when Linux was Intel PC-only,
109 * and specifically for each board rather than each chip. This makes their
110 * adaptation to platforms like the Mac (Some of which use NCR5380's)
111 * more difficult than it has to be.
112 *
113 * Also, many of the SCSI drivers were written before the command queuing
Roman Zippelc28bda22007-05-01 22:32:36 +0200114 * routines were implemented, meaning their implementations of queued
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * commands were hacked on rather than designed in from the start.
116 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200117 * When I designed the Linux SCSI drivers I figured that
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 * while having two different SCSI boards in a system might be useful
119 * for debugging things, two of the same type wouldn't be used.
120 * Well, I was wrong and a number of users have mailed me about running
121 * multiple high-performance SCSI boards in a server.
122 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200123 * Finally, when I get questions from users, I have no idea what
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * revision of my driver they are running.
125 *
126 * This driver attempts to address these problems :
Roman Zippelc28bda22007-05-01 22:32:36 +0200127 * This is a generic 5380 driver. To use it on a different platform,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * one simply writes appropriate system specific macros (ie, data
Roman Zippelc28bda22007-05-01 22:32:36 +0200129 * transfer - some PC's will use the I/O bus, 68K's must use
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * memory mapped) and drops this file in their 'C' wrapper.
131 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200132 * As far as command queueing, two queues are maintained for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 * each 5380 in the system - commands that haven't been issued yet,
Roman Zippelc28bda22007-05-01 22:32:36 +0200134 * and commands that are currently executing. This means that an
135 * unlimited number of commands may be queued, letting
136 * more commands propagate from the higher driver levels giving higher
137 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
138 * allowing multiple commands to propagate all the way to a SCSI-II device
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 * while a command is already executing.
140 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200141 * To solve the multiple-boards-in-the-same-system problem,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 * there is a separate instance structure for each instance
143 * of a 5380 in the system. So, multiple NCR5380 drivers will
144 * be able to coexist with appropriate changes to the high level
Roman Zippelc28bda22007-05-01 22:32:36 +0200145 * SCSI code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 *
147 * A NCR5380_PUBLIC_REVISION macro is provided, with the release
Roman Zippelc28bda22007-05-01 22:32:36 +0200148 * number (updated for each public release) printed by the
149 * NCR5380_print_options command, which should be called from the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * wrapper detect function, so that I know what release of the driver
151 * users are using.
152 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200153 * Issues specific to the NCR5380 :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200155 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
156 * piece of hardware that requires you to sit in a loop polling for
157 * the REQ signal as long as you are connected. Some devices are
158 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 * while doing long seek operations.
Roman Zippelc28bda22007-05-01 22:32:36 +0200160 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 * The workaround for this is to keep track of devices that have
162 * disconnected. If the device hasn't disconnected, for commands that
Roman Zippelc28bda22007-05-01 22:32:36 +0200163 * should disconnect, we do something like
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 *
165 * while (!REQ is asserted) { sleep for N usecs; poll for M usecs }
Roman Zippelc28bda22007-05-01 22:32:36 +0200166 *
167 * Some tweaking of N and M needs to be done. An algorithm based
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 * on "time to data" would give the best results as long as short time
Roman Zippelc28bda22007-05-01 22:32:36 +0200169 * to datas (ie, on the same track) were considered, however these
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 * broken devices are the exception rather than the rule and I'd rather
171 * spend my time optimizing for the normal case.
172 *
173 * Architecture :
174 *
175 * At the heart of the design is a coroutine, NCR5380_main,
176 * which is started when not running by the interrupt handler,
177 * timer, and queue command function. It attempts to establish
Roman Zippelc28bda22007-05-01 22:32:36 +0200178 * I_T_L or I_T_L_Q nexuses by removing the commands from the
179 * issue queue and calling NCR5380_select() if a nexus
180 * is not established.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 *
182 * Once a nexus is established, the NCR5380_information_transfer()
183 * phase goes through the various phases as instructed by the target.
184 * if the target goes into MSG IN and sends a DISCONNECT message,
185 * the command structure is placed into the per instance disconnected
186 * queue, and NCR5380_main tries to find more work. If USLEEP
187 * was defined, and the target is idle for too long, the system
188 * will try to sleep.
189 *
190 * If a command has disconnected, eventually an interrupt will trigger,
191 * calling NCR5380_intr() which will in turn call NCR5380_reselect
192 * to reestablish a nexus. This will run main if necessary.
193 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200194 * On command termination, the done function will be called as
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 * appropriate.
196 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200197 * SCSI pointers are maintained in the SCp field of SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 * structures, being initialized after the command is connected
199 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
200 * Note that in violation of the standard, an implicit SAVE POINTERS operation
201 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
202 */
203
204/*
205 * Using this file :
206 * This file a skeleton Linux SCSI driver for the NCR 5380 series
Roman Zippelc28bda22007-05-01 22:32:36 +0200207 * of chips. To use it, you write an architecture specific functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 * and macros and include this file in your driver.
209 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200210 * These macros control options :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
Roman Zippelc28bda22007-05-01 22:32:36 +0200212 * for commands that return with a CHECK CONDITION status.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 *
214 * LINKED - if defined, linked commands are supported.
215 *
216 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
217 *
218 * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible
219 *
220 * These macros MUST be defined :
Roman Zippelc28bda22007-05-01 22:32:36 +0200221 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222 * NCR5380_read(register) - read from the specified register
223 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200224 * NCR5380_write(register, value) - write to the specific register
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 *
226 * Either real DMA *or* pseudo DMA may be implemented
Roman Zippelc28bda22007-05-01 22:32:36 +0200227 * REAL functions :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
Roman Zippelc28bda22007-05-01 22:32:36 +0200229 * Note that the DMA setup functions should return the number of bytes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 * that they were able to program the controller for.
231 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200232 * Also note that generic i386/PC versions of these macros are
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 * available as NCR5380_i386_dma_write_setup,
234 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
235 *
236 * NCR5380_dma_write_setup(instance, src, count) - initialize
237 * NCR5380_dma_read_setup(instance, dst, count) - initialize
238 * NCR5380_dma_residual(instance); - residual count
239 *
240 * PSEUDO functions :
241 * NCR5380_pwrite(instance, src, count)
242 * NCR5380_pread(instance, dst, count);
243 *
244 * If nothing specific to this implementation needs doing (ie, with external
Roman Zippelc28bda22007-05-01 22:32:36 +0200245 * hardware), you must also define
246 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 * NCR5380_queue_command
248 * NCR5380_reset
249 * NCR5380_abort
250 * NCR5380_proc_info
251 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200252 * to be the global entry points into the specific driver, ie
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 * #define NCR5380_queue_command t128_queue_command.
254 *
255 * If this is not done, the routines will be defined as static functions
256 * with the NCR5380* names and the user must provide a globally
257 * accessible wrapper function.
258 *
259 * The generic driver is initialized by calling NCR5380_init(instance),
Roman Zippelc28bda22007-05-01 22:32:36 +0200260 * after setting the appropriate host specific fields and ID. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
262 * possible) function may be used. Before the specific driver initialization
263 * code finishes, NCR5380_print_options should be called.
264 */
265
266static struct Scsi_Host *first_instance = NULL;
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100267static struct scsi_host_template *the_template = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269/* Macros ease life... :-) */
270#define SETUP_HOSTDATA(in) \
271 struct NCR5380_hostdata *hostdata = \
272 (struct NCR5380_hostdata *)(in)->hostdata
273#define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata)
274
Roman Zippel3130d902007-05-01 22:32:37 +0200275#define NEXT(cmd) ((Scsi_Cmnd *)(cmd)->host_scribble)
276#define SET_NEXT(cmd,next) ((cmd)->host_scribble = (void *)(next))
277#define NEXTADDR(cmd) ((Scsi_Cmnd **)&(cmd)->host_scribble)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279#define HOSTNO instance->host_no
280#define H_NO(cmd) (cmd)->device->host->host_no
281
282#ifdef SUPPORT_TAGS
283
284/*
285 * Functions for handling tagged queuing
286 * =====================================
287 *
288 * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes:
289 *
290 * Using consecutive numbers for the tags is no good idea in my eyes. There
291 * could be wrong re-usings if the counter (8 bit!) wraps and some early
292 * command has been preempted for a long time. My solution: a bitfield for
293 * remembering used tags.
294 *
295 * There's also the problem that each target has a certain queue size, but we
296 * cannot know it in advance :-( We just see a QUEUE_FULL status being
297 * returned. So, in this case, the driver internal queue size assumption is
298 * reduced to the number of active tags if QUEUE_FULL is returned by the
299 * target. The command is returned to the mid-level, but with status changed
300 * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL
301 * correctly.
302 *
303 * We're also not allowed running tagged commands as long as an untagged
304 * command is active. And REQUEST SENSE commands after a contingent allegiance
305 * condition _must_ be untagged. To keep track whether an untagged command has
306 * been issued, the host->busy array is still employed, as it is without
307 * support for tagged queuing.
308 *
309 * One could suspect that there are possible race conditions between
310 * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the
311 * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(),
312 * which already guaranteed to be running at most once. It is also the only
313 * place where tags/LUNs are allocated. So no other allocation can slip
314 * between that pair, there could only happen a reselection, which can free a
315 * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes
316 * important: the tag bit must be cleared before 'nr_allocated' is decreased.
317 */
318
319/* -1 for TAG_NONE is not possible with unsigned char cmd->tag */
320#undef TAG_NONE
321#define TAG_NONE 0xff
322
323typedef struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200324 DECLARE_BITMAP(allocated, MAX_TAGS);
325 int nr_allocated;
326 int queue_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327} TAG_ALLOC;
328
Roman Zippelc28bda22007-05-01 22:32:36 +0200329static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331
Roman Zippelc28bda22007-05-01 22:32:36 +0200332static void __init init_tags(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
Roman Zippelc28bda22007-05-01 22:32:36 +0200334 int target, lun;
335 TAG_ALLOC *ta;
336
337 if (!setup_use_tagged_queuing)
338 return;
339
340 for (target = 0; target < 8; ++target) {
341 for (lun = 0; lun < 8; ++lun) {
342 ta = &TagAlloc[target][lun];
343 bitmap_zero(ta->allocated, MAX_TAGS);
344 ta->nr_allocated = 0;
345 /* At the beginning, assume the maximum queue size we could
346 * support (MAX_TAGS). This value will be decreased if the target
347 * returns QUEUE_FULL status.
348 */
349 ta->queue_size = MAX_TAGS;
350 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352}
353
354
355/* Check if we can issue a command to this LUN: First see if the LUN is marked
356 * busy by an untagged command. If the command should use tagged queuing, also
357 * check that there is a free tag and the target's queue won't overflow. This
358 * function should be called with interrupts disabled to avoid race
359 * conditions.
Roman Zippelc28bda22007-05-01 22:32:36 +0200360 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Roman Zippelc28bda22007-05-01 22:32:36 +0200362static int is_lun_busy(Scsi_Cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363{
Roman Zippelc28bda22007-05-01 22:32:36 +0200364 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Roman Zippelc28bda22007-05-01 22:32:36 +0200366 if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun))
367 return 1;
368 if (!should_be_tagged ||
369 !setup_use_tagged_queuing || !cmd->device->tagged_supported)
370 return 0;
371 if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >=
372 TagAlloc[cmd->device->id][cmd->device->lun].queue_size) {
373 TAG_PRINTK("scsi%d: target %d lun %d: no free tags\n",
374 H_NO(cmd), cmd->device->id, cmd->device->lun);
375 return 1;
376 }
377 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378}
379
380
381/* Allocate a tag for a command (there are no checks anymore, check_lun_busy()
382 * must be called before!), or reserve the LUN in 'busy' if the command is
383 * untagged.
384 */
385
Roman Zippelc28bda22007-05-01 22:32:36 +0200386static void cmd_get_tag(Scsi_Cmnd *cmd, int should_be_tagged)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387{
Roman Zippelc28bda22007-05-01 22:32:36 +0200388 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
Roman Zippelc28bda22007-05-01 22:32:36 +0200390 /* If we or the target don't support tagged queuing, allocate the LUN for
391 * an untagged command.
392 */
393 if (!should_be_tagged ||
394 !setup_use_tagged_queuing || !cmd->device->tagged_supported) {
395 cmd->tag = TAG_NONE;
396 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
397 TAG_PRINTK("scsi%d: target %d lun %d now allocated by untagged "
398 "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun);
399 } else {
400 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
Roman Zippelc28bda22007-05-01 22:32:36 +0200402 cmd->tag = find_first_zero_bit(ta->allocated, MAX_TAGS);
403 set_bit(cmd->tag, ta->allocated);
404 ta->nr_allocated++;
405 TAG_PRINTK("scsi%d: using tag %d for target %d lun %d "
406 "(now %d tags in use)\n",
407 H_NO(cmd), cmd->tag, cmd->device->id,
408 cmd->device->lun, ta->nr_allocated);
409 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410}
411
412
413/* Mark the tag of command 'cmd' as free, or in case of an untagged command,
414 * unlock the LUN.
415 */
416
Roman Zippelc28bda22007-05-01 22:32:36 +0200417static void cmd_free_tag(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
Roman Zippelc28bda22007-05-01 22:32:36 +0200419 SETUP_HOSTDATA(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Roman Zippelc28bda22007-05-01 22:32:36 +0200421 if (cmd->tag == TAG_NONE) {
422 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
423 TAG_PRINTK("scsi%d: target %d lun %d untagged cmd finished\n",
424 H_NO(cmd), cmd->device->id, cmd->device->lun);
425 } else if (cmd->tag >= MAX_TAGS) {
426 printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n",
427 H_NO(cmd), cmd->tag);
428 } else {
429 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
430 clear_bit(cmd->tag, ta->allocated);
431 ta->nr_allocated--;
432 TAG_PRINTK("scsi%d: freed tag %d for target %d lun %d\n",
433 H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun);
434 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435}
436
437
Roman Zippelc28bda22007-05-01 22:32:36 +0200438static void free_all_tags(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439{
Roman Zippelc28bda22007-05-01 22:32:36 +0200440 int target, lun;
441 TAG_ALLOC *ta;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
Roman Zippelc28bda22007-05-01 22:32:36 +0200443 if (!setup_use_tagged_queuing)
444 return;
445
446 for (target = 0; target < 8; ++target) {
447 for (lun = 0; lun < 8; ++lun) {
448 ta = &TagAlloc[target][lun];
449 bitmap_zero(ta->allocated, MAX_TAGS);
450 ta->nr_allocated = 0;
451 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455#endif /* SUPPORT_TAGS */
456
457
458/*
459 * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd )
460 *
461 * Purpose: Try to merge several scatter-gather requests into one DMA
462 * transfer. This is possible if the scatter buffers lie on
463 * physical contiguous addresses.
464 *
465 * Parameters: Scsi_Cmnd *cmd
466 * The command to work on. The first scatter buffer's data are
467 * assumed to be already transfered into ptr/this_residual.
468 */
469
Roman Zippelc28bda22007-05-01 22:32:36 +0200470static void merge_contiguous_buffers(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471{
Roman Zippelc28bda22007-05-01 22:32:36 +0200472 unsigned long endaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200474 unsigned long oldlen = cmd->SCp.this_residual;
475 int cnt = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476#endif
477
Roman Zippelc28bda22007-05-01 22:32:36 +0200478 for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1;
479 cmd->SCp.buffers_residual &&
480 virt_to_phys(page_address(cmd->SCp.buffer[1].page) +
481 cmd->SCp.buffer[1].offset) == endaddr;) {
482 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
Roman Zippel3130d902007-05-01 22:32:37 +0200483 page_address(cmd->SCp.buffer[1].page), endaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200485 ++cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200487 ++cmd->SCp.buffer;
488 --cmd->SCp.buffers_residual;
489 cmd->SCp.this_residual += cmd->SCp.buffer->length;
490 endaddr += cmd->SCp.buffer->length;
491 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200493 if (oldlen != cmd->SCp.this_residual)
494 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
495 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496#endif
497}
498
499/*
500 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
501 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200502 * Purpose : initialize the saved data pointers for cmd to point to the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 * start of the buffer.
504 *
505 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
506 */
507
Roman Zippelc28bda22007-05-01 22:32:36 +0200508static inline void initialize_SCp(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509{
Roman Zippelc28bda22007-05-01 22:32:36 +0200510 /*
511 * Initialize the Scsi Pointer field so that all of the commands in the
512 * various queues are valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200514
515 if (cmd->use_sg) {
516 cmd->SCp.buffer = (struct scatterlist *)cmd->request_buffer;
517 cmd->SCp.buffers_residual = cmd->use_sg - 1;
518 cmd->SCp.ptr = (char *)page_address(cmd->SCp.buffer->page) +
519 cmd->SCp.buffer->offset;
520 cmd->SCp.this_residual = cmd->SCp.buffer->length;
521 /* ++roman: Try to merge some scatter-buffers if they are at
522 * contiguous physical addresses.
523 */
524 merge_contiguous_buffers(cmd);
525 } else {
526 cmd->SCp.buffer = NULL;
527 cmd->SCp.buffers_residual = 0;
528 cmd->SCp.ptr = (char *)cmd->request_buffer;
529 cmd->SCp.this_residual = cmd->request_bufflen;
530 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531}
532
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533#include <linux/delay.h>
534
535#if NDEBUG
536static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200537 unsigned char mask;
538 const char *name;
539} signals[] = {
540 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
541 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
542 { SR_SEL, "SEL" }, {0, NULL}
543}, basrs[] = {
544 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
545}, icrs[] = {
546 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
547 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
548 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
549 {0, NULL}
550}, mrs[] = {
551 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
552 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
553 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
554 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
555 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
556 {0, NULL}
557};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559/*
560 * Function : void NCR5380_print(struct Scsi_Host *instance)
561 *
562 * Purpose : print the SCSI bus signals for debugging purposes
563 *
564 * Input : instance - which NCR5380
565 */
566
Roman Zippelc28bda22007-05-01 22:32:36 +0200567static void NCR5380_print(struct Scsi_Host *instance)
568{
569 unsigned char status, data, basr, mr, icr, i;
570 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571
Roman Zippelc28bda22007-05-01 22:32:36 +0200572 local_irq_save(flags);
573 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
574 status = NCR5380_read(STATUS_REG);
575 mr = NCR5380_read(MODE_REG);
576 icr = NCR5380_read(INITIATOR_COMMAND_REG);
577 basr = NCR5380_read(BUS_AND_STATUS_REG);
578 local_irq_restore(flags);
579 printk("STATUS_REG: %02x ", status);
580 for (i = 0; signals[i].mask; ++i)
581 if (status & signals[i].mask)
582 printk(",%s", signals[i].name);
583 printk("\nBASR: %02x ", basr);
584 for (i = 0; basrs[i].mask; ++i)
585 if (basr & basrs[i].mask)
586 printk(",%s", basrs[i].name);
587 printk("\nICR: %02x ", icr);
588 for (i = 0; icrs[i].mask; ++i)
589 if (icr & icrs[i].mask)
590 printk(",%s", icrs[i].name);
591 printk("\nMODE: %02x ", mr);
592 for (i = 0; mrs[i].mask; ++i)
593 if (mr & mrs[i].mask)
594 printk(",%s", mrs[i].name);
595 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596}
597
598static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200599 unsigned char value;
600 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601} phases[] = {
Roman Zippelc28bda22007-05-01 22:32:36 +0200602 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
603 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
604 {PHASE_UNKNOWN, "UNKNOWN"}
605};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606
Roman Zippelc28bda22007-05-01 22:32:36 +0200607/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
609 *
610 * Purpose : print the current SCSI phase for debugging purposes
611 *
612 * Input : instance - which NCR5380
613 */
614
615static void NCR5380_print_phase(struct Scsi_Host *instance)
616{
Roman Zippelc28bda22007-05-01 22:32:36 +0200617 unsigned char status;
618 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
Roman Zippelc28bda22007-05-01 22:32:36 +0200620 status = NCR5380_read(STATUS_REG);
621 if (!(status & SR_REQ))
622 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
623 else {
624 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
625 (phases[i].value != (status & PHASE_MASK)); ++i)
626 ;
627 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
628 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629}
630
631#else /* !NDEBUG */
632
633/* dummies... */
Roman Zippelc28bda22007-05-01 22:32:36 +0200634static inline void NCR5380_print(struct Scsi_Host *instance)
635{
636};
637static inline void NCR5380_print_phase(struct Scsi_Host *instance)
638{
639};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640
641#endif
642
643/*
644 * ++roman: New scheme of calling NCR5380_main()
Roman Zippelc28bda22007-05-01 22:32:36 +0200645 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646 * If we're not in an interrupt, we can call our main directly, it cannot be
647 * already running. Else, we queue it on a task queue, if not 'main_running'
648 * tells us that a lower level is already executing it. This way,
649 * 'main_running' needs not be protected in a special way.
650 *
651 * queue_main() is a utility function for putting our main onto the task
652 * queue, if main_running is false. It should be called only from a
653 * interrupt or bottom half.
654 */
655
656#include <linux/workqueue.h>
657#include <linux/interrupt.h>
658
Roman Zippelc28bda22007-05-01 22:32:36 +0200659static volatile int main_running;
Geert Uytterhoevenb312b382007-05-01 22:32:48 +0200660static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
Roman Zippelc28bda22007-05-01 22:32:36 +0200662static inline void queue_main(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663{
Roman Zippelc28bda22007-05-01 22:32:36 +0200664 if (!main_running) {
665 /* If in interrupt and NCR5380_main() not already running,
666 queue it on the 'immediate' task queue, to be processed
667 immediately after the current interrupt processing has
668 finished. */
669 schedule_work(&NCR5380_tqueue);
670 }
671 /* else: nothing to do: the running NCR5380_main() will pick up
672 any newly queued command. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673}
674
675
Roman Zippelc28bda22007-05-01 22:32:36 +0200676static inline void NCR5380_all_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677{
Roman Zippelc28bda22007-05-01 22:32:36 +0200678 static int done = 0;
679 if (!done) {
680 INI_PRINTK("scsi : NCR5380_all_init()\n");
681 done = 1;
682 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Roman Zippelc28bda22007-05-01 22:32:36 +0200685
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686/*
687 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
688 *
689 * Purpose : called by probe code indicating the NCR5380 driver
690 * options that were selected.
691 *
692 * Inputs : instance, pointer to this instance. Unused.
693 */
694
Roman Zippelc28bda22007-05-01 22:32:36 +0200695static void __init NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696{
Roman Zippelc28bda22007-05-01 22:32:36 +0200697 printk(" generic options"
698#ifdef AUTOSENSE
699 " AUTOSENSE"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700#endif
701#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200702 " REAL DMA"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703#endif
704#ifdef PARITY
Roman Zippelc28bda22007-05-01 22:32:36 +0200705 " PARITY"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706#endif
707#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200708 " SCSI-2 TAGGED QUEUING"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200710 );
711 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712}
713
714/*
715 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
716 *
717 * Purpose : print commands in the various queues, called from
718 * NCR5380_abort and NCR5380_debug to aid debugging.
719 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200720 * Inputs : instance, pointer to this instance.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721 */
722
Roman Zippelc28bda22007-05-01 22:32:36 +0200723static void NCR5380_print_status(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724{
Roman Zippelc28bda22007-05-01 22:32:36 +0200725 char *pr_bfr;
726 char *start;
727 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
Roman Zippelc28bda22007-05-01 22:32:36 +0200729 NCR_PRINT(NDEBUG_ANY);
730 NCR_PRINT_PHASE(NDEBUG_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731
Roman Zippelc28bda22007-05-01 22:32:36 +0200732 pr_bfr = (char *)__get_free_page(GFP_ATOMIC);
733 if (!pr_bfr) {
734 printk("NCR5380_print_status: no memory for print buffer\n");
735 return;
736 }
737 len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0);
738 pr_bfr[len] = 0;
739 printk("\n%s\n", pr_bfr);
740 free_page((unsigned long)pr_bfr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741}
742
743
744/******************************************/
745/*
746 * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED]
747 *
748 * *buffer: I/O buffer
749 * **start: if inout == FALSE pointer into buffer where user read should start
750 * offset: current offset
751 * length: length of buffer
752 * hostno: Scsi_Host host_no
753 * inout: TRUE - user is writing; FALSE - user is reading
754 *
755 * Return the number of bytes read from or written
756*/
757
758#undef SPRINTF
Roman Zippelc28bda22007-05-01 22:32:36 +0200759#define SPRINTF(fmt,args...) \
760 do { \
761 if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \
762 pos += sprintf(pos, fmt , ## args); \
763 } while(0)
764static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765
Roman Zippelc28bda22007-05-01 22:32:36 +0200766static int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer,
767 char **start, off_t offset, int length, int inout)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
Roman Zippelc28bda22007-05-01 22:32:36 +0200769 char *pos = buffer;
770 struct NCR5380_hostdata *hostdata;
771 Scsi_Cmnd *ptr;
772 unsigned long flags;
773 off_t begin = 0;
774#define check_offset() \
775 do { \
776 if (pos - buffer < offset - begin) { \
777 begin += pos - buffer; \
778 pos = buffer; \
779 } \
780 } while (0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Roman Zippelc28bda22007-05-01 22:32:36 +0200782 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
Roman Zippelc28bda22007-05-01 22:32:36 +0200784 if (inout) /* Has data been written to the file ? */
785 return -ENOSYS; /* Currently this is a no-op */
786 SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 check_offset();
Roman Zippelc28bda22007-05-01 22:32:36 +0200788 local_irq_save(flags);
789 SPRINTF("NCR5380: coroutine is%s running.\n",
790 main_running ? "" : "n't");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 check_offset();
Roman Zippelc28bda22007-05-01 22:32:36 +0200792 if (!hostdata->connected)
793 SPRINTF("scsi%d: no currently connected command\n", HOSTNO);
794 else
795 pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected,
796 pos, buffer, length);
797 SPRINTF("scsi%d: issue_queue\n", HOSTNO);
798 check_offset();
799 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr)) {
800 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
801 check_offset();
802 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
Roman Zippelc28bda22007-05-01 22:32:36 +0200804 SPRINTF("scsi%d: disconnected_queue\n", HOSTNO);
805 check_offset();
806 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
807 ptr = NEXT(ptr)) {
808 pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length);
809 check_offset();
810 }
811
812 local_irq_restore(flags);
813 *start = buffer + (offset - begin);
814 if (pos - buffer < offset - begin)
815 return 0;
816 else if (pos - buffer - (offset - begin) < length)
817 return pos - buffer - (offset - begin);
818 return length;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819}
820
Roman Zippelc28bda22007-05-01 22:32:36 +0200821static char *lprint_Scsi_Cmnd(Scsi_Cmnd *cmd, char *pos, char *buffer, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822{
Roman Zippelc28bda22007-05-01 22:32:36 +0200823 int i, s;
824 unsigned char *command;
825 SPRINTF("scsi%d: destination target %d, lun %d\n",
826 H_NO(cmd), cmd->device->id, cmd->device->lun);
827 SPRINTF(" command = ");
828 command = cmd->cmnd;
829 SPRINTF("%2d (0x%02x)", command[0], command[0]);
830 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
831 SPRINTF(" %02x", command[i]);
832 SPRINTF("\n");
833 return pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834}
835
836
Roman Zippelc28bda22007-05-01 22:32:36 +0200837/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 * Function : void NCR5380_init (struct Scsi_Host *instance)
839 *
840 * Purpose : initializes *instance and corresponding 5380 chip.
841 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200842 * Inputs : instance - instantiation of the 5380 driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 *
844 * Notes : I assume that the host, hostno, and id bits have been
Roman Zippelc28bda22007-05-01 22:32:36 +0200845 * set correctly. I don't care about the irq and other fields.
846 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 */
848
Roman Zippelc28bda22007-05-01 22:32:36 +0200849static int NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850{
Roman Zippelc28bda22007-05-01 22:32:36 +0200851 int i;
852 SETUP_HOSTDATA(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Roman Zippelc28bda22007-05-01 22:32:36 +0200854 NCR5380_all_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Roman Zippelc28bda22007-05-01 22:32:36 +0200856 hostdata->aborted = 0;
857 hostdata->id_mask = 1 << instance->this_id;
858 hostdata->id_higher_mask = 0;
859 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
860 if (i > hostdata->id_mask)
861 hostdata->id_higher_mask |= i;
862 for (i = 0; i < 8; ++i)
863 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200865 init_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866#endif
867#if defined (REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +0200868 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200870 hostdata->targets_present = 0;
871 hostdata->connected = NULL;
872 hostdata->issue_queue = NULL;
873 hostdata->disconnected_queue = NULL;
874 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875
Roman Zippelc28bda22007-05-01 22:32:36 +0200876 if (!the_template) {
877 the_template = instance->hostt;
878 first_instance = instance;
879 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881#ifndef AUTOSENSE
Roman Zippelc28bda22007-05-01 22:32:36 +0200882 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
883 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
884 " without AUTOSENSE option, contingent allegiance conditions may\n"
885 " be incorrectly cleared.\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886#endif /* def AUTOSENSE */
887
Roman Zippelc28bda22007-05-01 22:32:36 +0200888 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
889 NCR5380_write(MODE_REG, MR_BASE);
890 NCR5380_write(TARGET_COMMAND_REG, 0);
891 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892
Roman Zippelc28bda22007-05-01 22:32:36 +0200893 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894}
895
Roman Zippelc28bda22007-05-01 22:32:36 +0200896/*
Roman Zippelc28bda22007-05-01 22:32:36 +0200897 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
898 * void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 *
900 * Purpose : enqueues a SCSI command
901 *
902 * Inputs : cmd - SCSI command, done - function called on completion, with
903 * a pointer to the command descriptor.
Roman Zippelc28bda22007-05-01 22:32:36 +0200904 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 * Returns : 0
906 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200907 * Side effects :
908 * cmd is added to the per instance issue_queue, with minor
909 * twiddling done to the host specific fields of cmd. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 * main coroutine is not running, it is restarted.
911 *
912 */
913
Roman Zippelc28bda22007-05-01 22:32:36 +0200914static int NCR5380_queue_command(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915{
Roman Zippelc28bda22007-05-01 22:32:36 +0200916 SETUP_HOSTDATA(cmd->device->host);
917 Scsi_Cmnd *tmp;
918 int oldto;
919 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920
921#if (NDEBUG & NDEBUG_NO_WRITE)
Roman Zippelc28bda22007-05-01 22:32:36 +0200922 switch (cmd->cmnd[0]) {
923 case WRITE_6:
924 case WRITE_10:
925 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
926 H_NO(cmd));
927 cmd->result = (DID_ERROR << 16);
928 done(cmd);
929 return 0;
930 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
932
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933#ifdef NCR5380_STATS
934# if 0
Roman Zippelc28bda22007-05-01 22:32:36 +0200935 if (!hostdata->connected && !hostdata->issue_queue &&
936 !hostdata->disconnected_queue) {
937 hostdata->timebase = jiffies;
938 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939# endif
940# ifdef NCR5380_STAT_LIMIT
Roman Zippelc28bda22007-05-01 22:32:36 +0200941 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942# endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200943 switch (cmd->cmnd[0]) {
944 case WRITE:
945 case WRITE_6:
946 case WRITE_10:
947 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
948 hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;
949 hostdata->pendingw++;
950 break;
951 case READ:
952 case READ_6:
953 case READ_10:
954 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
955 hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;
956 hostdata->pendingr++;
957 break;
958 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959#endif
960
Roman Zippelc28bda22007-05-01 22:32:36 +0200961 /*
962 * We use the host_scribble field as a pointer to the next command
963 * in a queue
964 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Roman Zippel3130d902007-05-01 22:32:37 +0200966 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +0200967 cmd->scsi_done = done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968
Roman Zippelc28bda22007-05-01 22:32:36 +0200969 cmd->result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970
Roman Zippelc28bda22007-05-01 22:32:36 +0200971 /*
972 * Insert the cmd into the issue queue. Note that REQUEST SENSE
973 * commands are added to the head of the queue since any command will
974 * clear the contingent allegiance condition that exists and the
975 * sense data is only guaranteed to be valid while the condition exists.
976 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977
Roman Zippelc28bda22007-05-01 22:32:36 +0200978 local_irq_save(flags);
979 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
980 * Otherwise a running NCR5380_main may steal the lock.
981 * Lock before actually inserting due to fairness reasons explained in
982 * atari_scsi.c. If we insert first, then it's impossible for this driver
983 * to release the lock.
984 * Stop timer for this command while waiting for the lock, or timeouts
985 * may happen (and they really do), and it's no good if the command doesn't
986 * appear in any of the queues.
987 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
988 * because also a timer int can trigger an abort or reset, which would
989 * alter queues and touch the lock.
990 */
991 if (!IS_A_TT()) {
Michael Schmitz8ce79552007-06-03 12:55:04 +0200992 /* perhaps stop command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200993 falcon_get_lock();
Michael Schmitz8ce79552007-06-03 12:55:04 +0200994 /* perhaps restart command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200995 }
996 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
997 LIST(cmd, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +0200998 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +0200999 hostdata->issue_queue = cmd;
1000 } else {
1001 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
1002 NEXT(tmp); tmp = NEXT(tmp))
1003 ;
1004 LIST(cmd, tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02001005 SET_NEXT(tmp, cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02001006 }
1007 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Roman Zippelc28bda22007-05-01 22:32:36 +02001009 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
1010 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011
Roman Zippelc28bda22007-05-01 22:32:36 +02001012 /* If queue_command() is called from an interrupt (real one or bottom
1013 * half), we let queue_main() do the job of taking care about main. If it
1014 * is already running, this is a no-op, else main will be queued.
1015 *
1016 * If we're not in an interrupt, we can call NCR5380_main()
1017 * unconditionally, because it cannot be already running.
1018 */
1019 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
1020 queue_main();
1021 else
1022 NCR5380_main(NULL);
1023 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024}
1025
1026/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001027 * Function : NCR5380_main (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001029 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1030 * be done on the NCR5380 host adapters in a system. Both
1031 * NCR5380_queue_command() and NCR5380_intr() will try to start it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 * in case it is not running.
Roman Zippelc28bda22007-05-01 22:32:36 +02001033 *
1034 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 * reenable them. This prevents reentrancy and kernel stack overflow.
Roman Zippelc28bda22007-05-01 22:32:36 +02001036 */
1037
Geert Uytterhoevenb312b382007-05-01 22:32:48 +02001038static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039{
Roman Zippelc28bda22007-05-01 22:32:36 +02001040 Scsi_Cmnd *tmp, *prev;
1041 struct Scsi_Host *instance = first_instance;
1042 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1043 int done;
1044 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045
Roman Zippelc28bda22007-05-01 22:32:36 +02001046 /*
1047 * We run (with interrupts disabled) until we're sure that none of
1048 * the host adapters have anything that can be done, at which point
1049 * we set main_running to 0 and exit.
1050 *
1051 * Interrupts are enabled before doing various other internal
1052 * instructions, after we've decided that we need to run through
1053 * the loop again.
1054 *
1055 * this should prevent any race conditions.
1056 *
1057 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1058 * because also a timer int can trigger an abort or reset, which can
1059 * alter queues and touch the Falcon lock.
1060 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061
Roman Zippelc28bda22007-05-01 22:32:36 +02001062 /* Tell int handlers main() is now already executing. Note that
1063 no races are possible here. If an int comes in before
1064 'main_running' is set here, and queues/executes main via the
1065 task queue, it doesn't do any harm, just this instance of main
1066 won't find any work left to do. */
1067 if (main_running)
1068 return;
1069 main_running = 1;
1070
1071 local_save_flags(flags);
1072 do {
1073 local_irq_disable(); /* Freeze request queues */
1074 done = 1;
1075
1076 if (!hostdata->connected) {
1077 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
1078 /*
1079 * Search through the issue_queue for a command destined
1080 * for a target that's not busy.
1081 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001083 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1084 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1085 ;
1086 /*printk("%p ", tmp);*/
1087 if ((tmp == prev) && tmp)
1088 printk(" LOOP\n");
1089 /* else printk("\n"); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001091 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1092 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093
1094#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001095 if (prev != tmp)
1096 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1097 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1098 tmp->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001100 /* When we find one, remove it from the issue queue. */
1101 /* ++guenther: possible race with Falcon locking */
1102 if (
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001104 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001106 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1107#endif
1108 ) {
1109 /* ++guenther: just to be sure, this must be atomic */
1110 local_irq_disable();
1111 if (prev) {
1112 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02001113 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02001114 } else {
1115 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1116 hostdata->issue_queue = NEXT(tmp);
1117 }
Roman Zippel3130d902007-05-01 22:32:37 +02001118 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02001119 falcon_dont_release++;
1120
1121 /* reenable interrupts after finding one */
1122 local_irq_restore(flags);
1123
1124 /*
1125 * Attempt to establish an I_T_L nexus here.
1126 * On success, instance->hostdata->connected is set.
1127 * On failure, we must add the command back to the
1128 * issue queue so we can keep trying.
1129 */
1130 MAIN_PRINTK("scsi%d: main(): command for target %d "
1131 "lun %d removed from issue_queue\n",
1132 HOSTNO, tmp->device->id, tmp->device->lun);
1133 /*
1134 * REQUEST SENSE commands are issued without tagged
1135 * queueing, even on SCSI-II devices because the
1136 * contingent allegiance condition exists for the
1137 * entire unit.
1138 */
1139 /* ++roman: ...and the standard also requires that
1140 * REQUEST SENSE command are untagged.
1141 */
1142
1143#ifdef SUPPORT_TAGS
1144 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1145#endif
1146 if (!NCR5380_select(instance, tmp,
1147 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1148 TAG_NEXT)) {
1149 falcon_dont_release--;
1150 /* release if target did not response! */
1151 falcon_release_lock_if_possible(hostdata);
1152 break;
1153 } else {
1154 local_irq_disable();
1155 LIST(tmp, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02001156 SET_NEXT(tmp, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02001157 hostdata->issue_queue = tmp;
1158#ifdef SUPPORT_TAGS
1159 cmd_free_tag(tmp);
1160#endif
1161 falcon_dont_release--;
1162 local_irq_restore(flags);
1163 MAIN_PRINTK("scsi%d: main(): select() failed, "
1164 "returned to issue_queue\n", HOSTNO);
1165 if (hostdata->connected)
1166 break;
1167 }
1168 } /* if target/lun/target queue is not busy */
1169 } /* for issue_queue */
1170 } /* if (!hostdata->connected) */
1171
1172 if (hostdata->connected
1173#ifdef REAL_DMA
1174 && !hostdata->dma_len
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175#endif
1176 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 local_irq_restore(flags);
Roman Zippelc28bda22007-05-01 22:32:36 +02001178 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1179 HOSTNO);
1180 NCR5380_information_transfer(instance);
1181 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1182 done = 0;
1183 }
1184 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
Roman Zippelc28bda22007-05-01 22:32:36 +02001186 /* Better allow ints _after_ 'main_running' has been cleared, else
1187 an interrupt could believe we'll pick up the work it left for
1188 us, but we won't see it anymore here... */
1189 main_running = 0;
1190 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191}
1192
1193
1194#ifdef REAL_DMA
1195/*
1196 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1197 *
1198 * Purpose : Called by interrupt handler when DMA finishes or a phase
Roman Zippelc28bda22007-05-01 22:32:36 +02001199 * mismatch occurs (which would finish the DMA transfer).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 *
1201 * Inputs : instance - this instance of the NCR5380.
1202 *
1203 */
1204
Roman Zippelc28bda22007-05-01 22:32:36 +02001205static void NCR5380_dma_complete(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206{
Roman Zippelc28bda22007-05-01 22:32:36 +02001207 SETUP_HOSTDATA(instance);
1208 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1209 unsigned char **data, p;
1210 volatile int *count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211
Roman Zippelc28bda22007-05-01 22:32:36 +02001212 if (!hostdata->connected) {
1213 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1214 "no connected cmd\n", HOSTNO);
1215 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217
Roman Zippelc28bda22007-05-01 22:32:36 +02001218 if (atari_read_overruns) {
1219 p = hostdata->connected->SCp.phase;
1220 if (p & SR_IO) {
1221 udelay(10);
1222 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1223 (BASR_PHASE_MATCH|BASR_ACK)) ==
1224 (BASR_PHASE_MATCH|BASR_ACK)) {
1225 saved_data = NCR5380_read(INPUT_DATA_REG);
1226 overrun = 1;
1227 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1228 }
1229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 }
Roman Zippelc28bda22007-05-01 22:32:36 +02001231
1232 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1233 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1234 NCR5380_read(STATUS_REG));
1235
1236 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1237 NCR5380_write(MODE_REG, MR_BASE);
1238 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1239
1240 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1241 hostdata->dma_len = 0;
1242
1243 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1244 count = &hostdata->connected->SCp.this_residual;
1245 *data += transfered;
1246 *count -= transfered;
1247
1248 if (atari_read_overruns) {
1249 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1250 cnt = toPIO = atari_read_overruns;
1251 if (overrun) {
1252 DMA_PRINTK("Got an input overrun, using saved byte\n");
1253 *(*data)++ = saved_data;
1254 (*count)--;
1255 cnt--;
1256 toPIO--;
1257 }
1258 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1259 NCR5380_transfer_pio(instance, &p, &cnt, data);
1260 *count -= toPIO - cnt;
1261 }
1262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263}
1264#endif /* REAL_DMA */
1265
1266
1267/*
1268 * Function : void NCR5380_intr (int irq)
Roman Zippelc28bda22007-05-01 22:32:36 +02001269 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
Roman Zippelc28bda22007-05-01 22:32:36 +02001271 * from the disconnected queue, and restarting NCR5380_main()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 * as required.
1273 *
1274 * Inputs : int irq, irq that caused this interrupt.
1275 *
1276 */
1277
Roman Zippelc28bda22007-05-01 22:32:36 +02001278static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279{
Roman Zippelc28bda22007-05-01 22:32:36 +02001280 struct Scsi_Host *instance = first_instance;
1281 int done = 1, handled = 0;
1282 unsigned char basr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Roman Zippelc28bda22007-05-01 22:32:36 +02001284 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285
Roman Zippelc28bda22007-05-01 22:32:36 +02001286 /* Look for pending interrupts */
1287 basr = NCR5380_read(BUS_AND_STATUS_REG);
1288 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1289 /* dispatch to appropriate routine if found and done=0 */
1290 if (basr & BASR_IRQ) {
1291 NCR_PRINT(NDEBUG_INTR);
1292 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1293 done = 0;
1294 ENABLE_IRQ();
1295 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1296 NCR5380_reselect(instance);
1297 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1298 } else if (basr & BASR_PARITY_ERROR) {
1299 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1300 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1301 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1302 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1303 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1304 } else {
1305 /*
1306 * The rest of the interrupt conditions can occur only during a
1307 * DMA transfer
1308 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309
1310#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001311 /*
1312 * We should only get PHASE MISMATCH and EOP interrupts if we have
1313 * DMA enabled, so do a sanity check based on the current setting
1314 * of the MODE register.
1315 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
Roman Zippelc28bda22007-05-01 22:32:36 +02001317 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1318 ((basr & BASR_END_DMA_TRANSFER) ||
1319 !(basr & BASR_PHASE_MATCH))) {
1320
1321 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1322 NCR5380_dma_complete( instance );
1323 done = 0;
1324 ENABLE_IRQ();
1325 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326#endif /* REAL_DMA */
Roman Zippelc28bda22007-05-01 22:32:36 +02001327 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
Roman Zippelc28bda22007-05-01 22:32:36 +02001329 if (basr & BASR_PHASE_MATCH)
1330 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1331 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1332 HOSTNO, basr, NCR5380_read(MODE_REG),
1333 NCR5380_read(STATUS_REG));
1334 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1335 }
1336 } /* if !(SELECTION || PARITY) */
1337 handled = 1;
1338 } /* BASR & IRQ */ else {
1339 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1340 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1341 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1342 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1343 }
1344
1345 if (!done) {
1346 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1347 /* Put a call to NCR5380_main() on the queue... */
1348 queue_main();
1349 }
1350 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351}
1352
1353#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02001354static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355{
1356# ifdef NCR5380_STAT_LIMIT
Roman Zippelc28bda22007-05-01 22:32:36 +02001357 if (cmd->request_bufflen > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358# endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001359 switch (cmd->cmnd[0]) {
1360 case WRITE:
1361 case WRITE_6:
1362 case WRITE_10:
1363 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
1364 /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/
1365 hostdata->pendingw--;
1366 break;
1367 case READ:
1368 case READ_6:
1369 case READ_10:
1370 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
1371 /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/
1372 hostdata->pendingr--;
1373 break;
1374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375}
1376#endif
1377
Roman Zippelc28bda22007-05-01 22:32:36 +02001378/*
1379 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 * int tag);
1381 *
1382 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Roman Zippelc28bda22007-05-01 22:32:36 +02001383 * including ARBITRATION, SELECTION, and initial message out for
1384 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001386 * Inputs : instance - instantiation of the 5380 driver on which this
1387 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1388 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 * the command that is presently connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001391 * Returns : -1 if selection could not execute for some reason,
1392 * 0 if selection succeeded or failed because the target
1393 * did not respond.
1394 *
1395 * Side effects :
1396 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 * with registers as they should have been on entry - ie
1398 * SELECT_ENABLE will be set appropriately, the NCR5380
1399 * will cease to drive any SCSI bus signals.
1400 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001401 * If successful : I_T_L or I_T_L_Q nexus will be established,
1402 * instance->connected will be set to cmd.
1403 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001405 * If failed (no target) : cmd->scsi_done() will be called, and the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 * cmd->result host byte set to DID_BAD_TARGET.
1407 */
1408
Roman Zippelc28bda22007-05-01 22:32:36 +02001409static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
Roman Zippelc28bda22007-05-01 22:32:36 +02001411 SETUP_HOSTDATA(instance);
1412 unsigned char tmp[3], phase;
1413 unsigned char *data;
1414 int len;
1415 unsigned long timeout;
1416 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
Roman Zippelc28bda22007-05-01 22:32:36 +02001418 hostdata->restart_select = 0;
1419 NCR_PRINT(NDEBUG_ARBITRATION);
1420 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1421 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422
Roman Zippelc28bda22007-05-01 22:32:36 +02001423 /*
1424 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1425 * data bus during SELECTION.
1426 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427
Roman Zippelc28bda22007-05-01 22:32:36 +02001428 local_irq_save(flags);
1429 if (hostdata->connected) {
1430 local_irq_restore(flags);
1431 return -1;
1432 }
1433 NCR5380_write(TARGET_COMMAND_REG, 0);
1434
1435 /*
1436 * Start arbitration.
1437 */
1438
1439 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1440 NCR5380_write(MODE_REG, MR_ARBITRATE);
1441
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
Roman Zippelc28bda22007-05-01 22:32:36 +02001444 /* Wait for arbitration logic to complete */
Michael Schmitzfb810d12007-05-01 22:32:35 +02001445#if defined(NCR_TIMEOUT)
Roman Zippelc28bda22007-05-01 22:32:36 +02001446 {
1447 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448
Roman Zippelc28bda22007-05-01 22:32:36 +02001449 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1450 time_before(jiffies, timeout) && !hostdata->connected)
1451 ;
1452 if (time_after_eq(jiffies, timeout)) {
1453 printk("scsi : arbitration timeout at %d\n", __LINE__);
1454 NCR5380_write(MODE_REG, MR_BASE);
1455 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1456 return -1;
1457 }
1458 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459#else /* NCR_TIMEOUT */
Roman Zippelc28bda22007-05-01 22:32:36 +02001460 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1461 !hostdata->connected)
1462 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463#endif
1464
Roman Zippelc28bda22007-05-01 22:32:36 +02001465 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
Roman Zippelc28bda22007-05-01 22:32:36 +02001467 if (hostdata->connected) {
1468 NCR5380_write(MODE_REG, MR_BASE);
1469 return -1;
1470 }
1471 /*
1472 * The arbitration delay is 2.2us, but this is a minimum and there is
1473 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1474 * the integral nature of udelay().
1475 *
1476 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
Roman Zippelc28bda22007-05-01 22:32:36 +02001478 udelay(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
Roman Zippelc28bda22007-05-01 22:32:36 +02001480 /* Check for lost arbitration */
1481 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1482 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1483 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1484 hostdata->connected) {
1485 NCR5380_write(MODE_REG, MR_BASE);
1486 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1487 HOSTNO);
1488 return -1;
1489 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
Roman Zippelc28bda22007-05-01 22:32:36 +02001491 /* after/during arbitration, BSY should be asserted.
1492 IBM DPES-31080 Version S31Q works now */
1493 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1494 NCR5380_write(INITIATOR_COMMAND_REG,
1495 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
Roman Zippelc28bda22007-05-01 22:32:36 +02001497 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1498 hostdata->connected) {
1499 NCR5380_write(MODE_REG, MR_BASE);
1500 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1501 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1502 HOSTNO);
1503 return -1;
1504 }
1505
1506 /*
1507 * Again, bus clear + bus settle time is 1.2us, however, this is
1508 * a minimum so we'll udelay ceil(1.2)
1509 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
1511#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
Roman Zippelc28bda22007-05-01 22:32:36 +02001512 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1513 udelay(15);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001515 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001517
1518 if (hostdata->connected) {
1519 NCR5380_write(MODE_REG, MR_BASE);
1520 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1521 return -1;
1522 }
1523
1524 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1525
1526 /*
1527 * Now that we have won arbitration, start Selection process, asserting
1528 * the host and target ID's on the SCSI bus.
1529 */
1530
1531 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1532
1533 /*
1534 * Raise ATN while SEL is true before BSY goes false from arbitration,
1535 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1536 * phase immediately after selection.
1537 */
1538
1539 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1540 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001542
Roman Zippelc28bda22007-05-01 22:32:36 +02001543 /*
1544 * Reselect interrupts must be turned off prior to the dropping of BSY,
1545 * otherwise we will trigger an interrupt.
1546 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547
Roman Zippelc28bda22007-05-01 22:32:36 +02001548 if (hostdata->connected) {
1549 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1550 return -1;
1551 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001552
Roman Zippelc28bda22007-05-01 22:32:36 +02001553 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554
Roman Zippelc28bda22007-05-01 22:32:36 +02001555 /*
1556 * The initiator shall then wait at least two deskew delays and release
1557 * the BSY signal.
1558 */
1559 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560
Roman Zippelc28bda22007-05-01 22:32:36 +02001561 /* Reset BSY */
1562 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1563 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Roman Zippelc28bda22007-05-01 22:32:36 +02001565 /*
1566 * Something weird happens when we cease to drive BSY - looks
1567 * like the board/chip is letting us do another read before the
1568 * appropriate propagation delay has expired, and we're confusing
1569 * a BSY signal from ourselves as the target's response to SELECTION.
1570 *
1571 * A small delay (the 'C++' frontend breaks the pipeline with an
1572 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1573 * tighter 'C' code breaks and requires this) solves the problem -
1574 * the 1 us delay is arbitrary, and only used because this delay will
1575 * be the same on other platforms and since it works here, it should
1576 * work there.
1577 *
1578 * wingel suggests that this could be due to failing to wait
1579 * one deskew delay.
1580 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001581
Roman Zippelc28bda22007-05-01 22:32:36 +02001582 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001583
Roman Zippelc28bda22007-05-01 22:32:36 +02001584 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001585
Roman Zippelc28bda22007-05-01 22:32:36 +02001586 /*
1587 * The SCSI specification calls for a 250 ms timeout for the actual
1588 * selection.
1589 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590
Roman Zippelc28bda22007-05-01 22:32:36 +02001591 timeout = jiffies + 25;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592
Roman Zippelc28bda22007-05-01 22:32:36 +02001593 /*
1594 * XXX very interesting - we're seeing a bounce where the BSY we
1595 * asserted is being reflected / still asserted (propagation delay?)
1596 * and it's detecting as true. Sigh.
1597 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598
1599#if 0
Roman Zippelc28bda22007-05-01 22:32:36 +02001600 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1601 * IO while SEL is true. But again, there are some disks out the in the
1602 * world that do that nevertheless. (Somebody claimed that this announces
1603 * reselection capability of the target.) So we better skip that test and
1604 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1605 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001606
Roman Zippelc28bda22007-05-01 22:32:36 +02001607 while (time_before(jiffies, timeout) &&
1608 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1609 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610
Roman Zippelc28bda22007-05-01 22:32:36 +02001611 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1613 NCR5380_reselect(instance);
1614 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1615 HOSTNO);
1616 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1617 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001618 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001620 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1621 ;
1622#endif
1623
1624 /*
1625 * No less than two deskew delays after the initiator detects the
1626 * BSY signal is true, it shall release the SEL signal and may
1627 * change the DATA BUS. -wingel
1628 */
1629
1630 udelay(1);
1631
1632 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1633
1634 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1635 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1636 if (hostdata->targets_present & (1 << cmd->device->id)) {
1637 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1638 if (hostdata->restart_select)
1639 printk(KERN_NOTICE "\trestart select\n");
1640 NCR_PRINT(NDEBUG_ANY);
1641 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1642 return -1;
1643 }
1644 cmd->result = DID_BAD_TARGET << 16;
1645#ifdef NCR5380_STATS
1646 collect_stats(hostdata, cmd);
1647#endif
1648#ifdef SUPPORT_TAGS
1649 cmd_free_tag(cmd);
1650#endif
1651 cmd->scsi_done(cmd);
1652 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1653 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1654 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1655 return 0;
1656 }
1657
1658 hostdata->targets_present |= (1 << cmd->device->id);
1659
1660 /*
1661 * Since we followed the SCSI spec, and raised ATN while SEL
1662 * was true but before BSY was false during selection, the information
1663 * transfer phase should be a MESSAGE OUT phase so that we can send the
1664 * IDENTIFY message.
1665 *
1666 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1667 * message (2 bytes) with a tag ID that we increment with every command
1668 * until it wraps back to 0.
1669 *
1670 * XXX - it turns out that there are some broken SCSI-II devices,
1671 * which claim to support tagged queuing but fail when more than
1672 * some number of commands are issued at once.
1673 */
1674
1675 /* Wait for start of REQ/ACK handshake */
1676 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1677 ;
1678
1679 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1680 HOSTNO, cmd->device->id);
1681 tmp[0] = IDENTIFY(1, cmd->device->lun);
1682
1683#ifdef SUPPORT_TAGS
1684 if (cmd->tag != TAG_NONE) {
1685 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1686 tmp[2] = cmd->tag;
1687 len = 3;
1688 } else
1689 len = 1;
1690#else
1691 len = 1;
1692 cmd->tag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693#endif /* SUPPORT_TAGS */
1694
Roman Zippelc28bda22007-05-01 22:32:36 +02001695 /* Send message(s) */
1696 data = tmp;
1697 phase = PHASE_MSGOUT;
1698 NCR5380_transfer_pio(instance, &phase, &len, &data);
1699 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1700 /* XXX need to handle errors here */
1701 hostdata->connected = cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001702#ifndef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001703 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1704#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705
Roman Zippelc28bda22007-05-01 22:32:36 +02001706 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707
Roman Zippelc28bda22007-05-01 22:32:36 +02001708 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709}
1710
Roman Zippelc28bda22007-05-01 22:32:36 +02001711/*
1712 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 * unsigned char *phase, int *count, unsigned char **data)
1714 *
1715 * Purpose : transfers data in given phase using polled I/O
1716 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001717 * Inputs : instance - instance of driver, *phase - pointer to
1718 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001720 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001721 * Returns : -1 when different phase is entered without transferring
1722 * maximum number of bytes, 0 if all bytes are transfered or exit
1723 * is in same phase.
1724 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001725 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001726 *
1727 * XXX Note : handling for bus free may be useful.
1728 */
1729
1730/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001731 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 * IS 100% reliable, and for the actual data transfer where speed
1733 * counts, we will always do a pseudo DMA or DMA transfer.
1734 */
1735
Roman Zippelc28bda22007-05-01 22:32:36 +02001736static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1737 unsigned char *phase, int *count,
1738 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739{
Roman Zippelc28bda22007-05-01 22:32:36 +02001740 register unsigned char p = *phase, tmp;
1741 register int c = *count;
1742 register unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001743
Roman Zippelc28bda22007-05-01 22:32:36 +02001744 /*
1745 * The NCR5380 chip will only drive the SCSI bus when the
1746 * phase specified in the appropriate bits of the TARGET COMMAND
1747 * REGISTER match the STATUS REGISTER
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748 */
1749
Roman Zippelc28bda22007-05-01 22:32:36 +02001750 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751
Roman Zippelc28bda22007-05-01 22:32:36 +02001752 do {
1753 /*
1754 * Wait for assertion of REQ, after which the phase bits will be
1755 * valid
1756 */
1757 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1758 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759
Roman Zippelc28bda22007-05-01 22:32:36 +02001760 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001761
Roman Zippelc28bda22007-05-01 22:32:36 +02001762 /* Check for phase mismatch */
1763 if ((tmp & PHASE_MASK) != p) {
1764 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1765 NCR_PRINT_PHASE(NDEBUG_PIO);
1766 break;
1767 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768
Roman Zippelc28bda22007-05-01 22:32:36 +02001769 /* Do actual transfer from SCSI bus to / from memory */
1770 if (!(p & SR_IO))
1771 NCR5380_write(OUTPUT_DATA_REG, *d);
1772 else
1773 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001774
Roman Zippelc28bda22007-05-01 22:32:36 +02001775 ++d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001776
Roman Zippelc28bda22007-05-01 22:32:36 +02001777 /*
1778 * The SCSI standard suggests that in MSGOUT phase, the initiator
1779 * should drop ATN on the last byte of the message phase
1780 * after REQ has been asserted for the handshake but before
1781 * the initiator raises ACK.
1782 */
1783
1784 if (!(p & SR_IO)) {
1785 if (!((p & SR_MSG) && c > 1)) {
1786 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1787 NCR_PRINT(NDEBUG_PIO);
1788 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1789 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1790 } else {
1791 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1792 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1793 NCR_PRINT(NDEBUG_PIO);
1794 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1795 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1796 }
1797 } else {
1798 NCR_PRINT(NDEBUG_PIO);
1799 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1800 }
1801
1802 while (NCR5380_read(STATUS_REG) & SR_REQ)
1803 ;
1804
1805 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1806
1807 /*
1808 * We have several special cases to consider during REQ/ACK handshaking :
1809 * 1. We were in MSGOUT phase, and we are on the last byte of the
1810 * message. ATN must be dropped as ACK is dropped.
1811 *
1812 * 2. We are in a MSGIN phase, and we are on the last byte of the
1813 * message. We must exit with ACK asserted, so that the calling
1814 * code may raise ATN before dropping ACK to reject the message.
1815 *
1816 * 3. ACK and ATN are clear and the target may proceed as normal.
1817 */
1818 if (!(p == PHASE_MSGIN && c == 1)) {
1819 if (p == PHASE_MSGOUT && c > 1)
1820 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1821 else
1822 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1823 }
1824 } while (--c);
1825
1826 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1827
1828 *count = c;
1829 *data = d;
1830 tmp = NCR5380_read(STATUS_REG);
1831 /* The phase read from the bus is valid if either REQ is (already)
1832 * asserted or if ACK hasn't been released yet. The latter is the case if
1833 * we're in MSGIN and all wanted bytes have been received.
1834 */
1835 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1836 *phase = tmp & PHASE_MASK;
1837 else
1838 *phase = PHASE_UNKNOWN;
1839
1840 if (!c || (*phase == p))
1841 return 0;
1842 else
1843 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844}
1845
1846/*
1847 * Function : do_abort (Scsi_Host *host)
Roman Zippelc28bda22007-05-01 22:32:36 +02001848 *
1849 * Purpose : abort the currently established nexus. Should only be
1850 * called from a routine which can drop into a
1851 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852 * Returns : 0 on success, -1 on failure.
1853 */
1854
Roman Zippelc28bda22007-05-01 22:32:36 +02001855static int do_abort(struct Scsi_Host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001856{
Roman Zippelc28bda22007-05-01 22:32:36 +02001857 unsigned char tmp, *msgptr, phase;
1858 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001859
Roman Zippelc28bda22007-05-01 22:32:36 +02001860 /* Request message out phase */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001861 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001862
Roman Zippelc28bda22007-05-01 22:32:36 +02001863 /*
1864 * Wait for the target to indicate a valid phase by asserting
1865 * REQ. Once this happens, we'll have either a MSGOUT phase
1866 * and can immediately send the ABORT message, or we'll have some
1867 * other phase and will have to source/sink data.
1868 *
1869 * We really don't care what value was on the bus or what value
1870 * the target sees, so we just handshake.
1871 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872
Roman Zippelc28bda22007-05-01 22:32:36 +02001873 while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ)
1874 ;
1875
1876 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1877
1878 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1879 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1880 ICR_ASSERT_ACK);
1881 while (NCR5380_read(STATUS_REG) & SR_REQ)
1882 ;
1883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1884 }
1885
1886 tmp = ABORT;
1887 msgptr = &tmp;
1888 len = 1;
1889 phase = PHASE_MSGOUT;
1890 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1891
1892 /*
1893 * If we got here, and the command completed successfully,
1894 * we're about to go into bus free state.
1895 */
1896
1897 return len ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001898}
1899
1900#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001901/*
1902 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001903 * unsigned char *phase, int *count, unsigned char **data)
1904 *
1905 * Purpose : transfers data in given phase using either real
1906 * or pseudo DMA.
1907 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001908 * Inputs : instance - instance of driver, *phase - pointer to
1909 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001910 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001911 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001912 * Returns : -1 when different phase is entered without transferring
1913 * maximum number of bytes, 0 if all bytes or transfered or exit
1914 * is in same phase.
1915 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001916 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 *
1918 */
1919
1920
Roman Zippelc28bda22007-05-01 22:32:36 +02001921static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1922 unsigned char *phase, int *count,
1923 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924{
Roman Zippelc28bda22007-05-01 22:32:36 +02001925 SETUP_HOSTDATA(instance);
1926 register int c = *count;
1927 register unsigned char p = *phase;
1928 register unsigned char *d = *data;
1929 unsigned char tmp;
1930 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001931
Roman Zippelc28bda22007-05-01 22:32:36 +02001932 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1933 *phase = tmp;
1934 return -1;
1935 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Roman Zippelc28bda22007-05-01 22:32:36 +02001937 if (atari_read_overruns && (p & SR_IO))
1938 c -= atari_read_overruns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001939
Roman Zippelc28bda22007-05-01 22:32:36 +02001940 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1941 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1942 c, (p & SR_IO) ? "to" : "from", d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943
Roman Zippelc28bda22007-05-01 22:32:36 +02001944 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001945
1946#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02001947 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948#endif /* def REAL_DMA */
1949
Roman Zippelc28bda22007-05-01 22:32:36 +02001950 if (IS_A_TT()) {
1951 /* On the Medusa, it is a must to initialize the DMA before
1952 * starting the NCR. This is also the cleaner way for the TT.
1953 */
1954 local_irq_save(flags);
1955 hostdata->dma_len = (p & SR_IO) ?
1956 NCR5380_dma_read_setup(instance, d, c) :
1957 NCR5380_dma_write_setup(instance, d, c);
1958 local_irq_restore(flags);
1959 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960
Roman Zippelc28bda22007-05-01 22:32:36 +02001961 if (p & SR_IO)
1962 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1963 else {
1964 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1965 NCR5380_write(START_DMA_SEND_REG, 0);
1966 }
1967
1968 if (!IS_A_TT()) {
1969 /* On the Falcon, the DMA setup must be done after the last */
1970 /* NCR access, else the DMA setup gets trashed!
1971 */
1972 local_irq_save(flags);
1973 hostdata->dma_len = (p & SR_IO) ?
1974 NCR5380_dma_read_setup(instance, d, c) :
1975 NCR5380_dma_write_setup(instance, d, c);
1976 local_irq_restore(flags);
1977 }
1978 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001979}
1980#endif /* defined(REAL_DMA) */
1981
1982/*
1983 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1984 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001985 * Purpose : run through the various SCSI phases and do as the target
1986 * directs us to. Operates on the currently connected command,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987 * instance->connected.
1988 *
1989 * Inputs : instance, instance for which we are doing commands
1990 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001991 * Side effects : SCSI things happen, the disconnected queue will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992 * modified if a command disconnects, *instance->connected will
1993 * change.
1994 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001995 * XXX Note : we need to watch for bus free or a reset condition here
1996 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 */
Roman Zippelc28bda22007-05-01 22:32:36 +02001998
1999static void NCR5380_information_transfer(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000{
Roman Zippelc28bda22007-05-01 22:32:36 +02002001 SETUP_HOSTDATA(instance);
2002 unsigned long flags;
2003 unsigned char msgout = NOP;
2004 int sink = 0;
2005 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02002007 int transfersize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002009 unsigned char *data;
2010 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
2011 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012
Roman Zippelc28bda22007-05-01 22:32:36 +02002013 while (1) {
2014 tmp = NCR5380_read(STATUS_REG);
2015 /* We only have a valid SCSI phase when REQ is asserted */
2016 if (tmp & SR_REQ) {
2017 phase = (tmp & PHASE_MASK);
2018 if (phase != old_phase) {
2019 old_phase = phase;
2020 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002022
Roman Zippelc28bda22007-05-01 22:32:36 +02002023 if (sink && (phase != PHASE_MSGOUT)) {
2024 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025
Roman Zippelc28bda22007-05-01 22:32:36 +02002026 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2027 ICR_ASSERT_ACK);
2028 while (NCR5380_read(STATUS_REG) & SR_REQ)
2029 ;
2030 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2031 ICR_ASSERT_ATN);
2032 sink = 0;
2033 continue;
2034 }
2035
2036 switch (phase) {
2037 case PHASE_DATAOUT:
2038#if (NDEBUG & NDEBUG_NO_DATAOUT)
2039 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2040 "aborted\n", HOSTNO);
2041 sink = 1;
2042 do_abort(instance);
2043 cmd->result = DID_ERROR << 16;
2044 cmd->done(cmd);
2045 return;
2046#endif
2047 case PHASE_DATAIN:
2048 /*
2049 * If there is no room left in the current buffer in the
2050 * scatter-gather list, move onto the next one.
2051 */
2052
2053 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2054 ++cmd->SCp.buffer;
2055 --cmd->SCp.buffers_residual;
2056 cmd->SCp.this_residual = cmd->SCp.buffer->length;
2057 cmd->SCp.ptr = page_address(cmd->SCp.buffer->page) +
2058 cmd->SCp.buffer->offset;
2059 /* ++roman: Try to merge some scatter-buffers if
2060 * they are at contiguous physical addresses.
2061 */
2062 merge_contiguous_buffers(cmd);
2063 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2064 HOSTNO, cmd->SCp.this_residual,
2065 cmd->SCp.buffers_residual);
2066 }
2067
2068 /*
2069 * The preferred transfer method is going to be
2070 * PSEUDO-DMA for systems that are strictly PIO,
2071 * since we can let the hardware do the handshaking.
2072 *
2073 * For this to work, we need to know the transfersize
2074 * ahead of time, since the pseudo-DMA code will sit
2075 * in an unconditional loop.
2076 */
2077
2078 /* ++roman: I suggest, this should be
2079 * #if def(REAL_DMA)
2080 * instead of leaving REAL_DMA out.
2081 */
2082
2083#if defined(REAL_DMA)
2084 if (!cmd->device->borken &&
2085 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2086 len = transfersize;
2087 cmd->SCp.phase = phase;
2088 if (NCR5380_transfer_dma(instance, &phase,
2089 &len, (unsigned char **)&cmd->SCp.ptr)) {
2090 /*
2091 * If the watchdog timer fires, all future
2092 * accesses to this device will use the
2093 * polled-IO. */
2094 printk(KERN_NOTICE "scsi%d: switching target %d "
2095 "lun %d to slow handshake\n", HOSTNO,
2096 cmd->device->id, cmd->device->lun);
2097 cmd->device->borken = 1;
2098 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2099 ICR_ASSERT_ATN);
2100 sink = 1;
2101 do_abort(instance);
2102 cmd->result = DID_ERROR << 16;
2103 cmd->done(cmd);
2104 /* XXX - need to source or sink data here, as appropriate */
2105 } else {
2106#ifdef REAL_DMA
2107 /* ++roman: When using real DMA,
2108 * information_transfer() should return after
2109 * starting DMA since it has nothing more to
2110 * do.
2111 */
2112 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002114 cmd->SCp.this_residual -= transfersize - len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002115#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002116 }
2117 } else
2118#endif /* defined(REAL_DMA) */
2119 NCR5380_transfer_pio(instance, &phase,
2120 (int *)&cmd->SCp.this_residual,
2121 (unsigned char **)&cmd->SCp.ptr);
2122 break;
2123 case PHASE_MSGIN:
2124 len = 1;
2125 data = &tmp;
2126 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2127 NCR5380_transfer_pio(instance, &phase, &len, &data);
2128 cmd->SCp.Message = tmp;
2129
2130 switch (tmp) {
2131 /*
2132 * Linking lets us reduce the time required to get the
2133 * next command out to the device, hopefully this will
2134 * mean we don't waste another revolution due to the delays
2135 * required by ARBITRATION and another SELECTION.
2136 *
2137 * In the current implementation proposal, low level drivers
2138 * merely have to start the next command, pointed to by
2139 * next_link, done() is called as with unlinked commands.
2140 */
2141#ifdef LINKED
2142 case LINKED_CMD_COMPLETE:
2143 case LINKED_FLG_CMD_COMPLETE:
2144 /* Accept message by clearing ACK */
2145 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2146
2147 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2148 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2149
2150 /* Enable reselect interrupts */
2151 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2152 /*
2153 * Sanity check : A linked command should only terminate
2154 * with one of these messages if there are more linked
2155 * commands available.
2156 */
2157
2158 if (!cmd->next_link) {
2159 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2160 "linked command complete, no next_link\n",
2161 HOSTNO, cmd->device->id, cmd->device->lun);
2162 sink = 1;
2163 do_abort(instance);
2164 return;
2165 }
2166
2167 initialize_SCp(cmd->next_link);
2168 /* The next command is still part of this process; copy it
2169 * and don't free it! */
2170 cmd->next_link->tag = cmd->tag;
2171 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2172 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2173 "done, calling scsi_done().\n",
2174 HOSTNO, cmd->device->id, cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02002176 collect_stats(hostdata, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002177#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002178 cmd->scsi_done(cmd);
2179 cmd = hostdata->connected;
2180 break;
2181#endif /* def LINKED */
2182 case ABORT:
2183 case COMMAND_COMPLETE:
2184 /* Accept message by clearing ACK */
2185 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2186 /* ++guenther: possible race with Falcon locking */
2187 falcon_dont_release++;
2188 hostdata->connected = NULL;
2189 QU_PRINTK("scsi%d: command for target %d, lun %d "
2190 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2191#ifdef SUPPORT_TAGS
2192 cmd_free_tag(cmd);
2193 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2194 /* Turn a QUEUE FULL status into BUSY, I think the
2195 * mid level cannot handle QUEUE FULL :-( (The
2196 * command is retried after BUSY). Also update our
2197 * queue size to the number of currently issued
2198 * commands now.
2199 */
2200 /* ++Andreas: the mid level code knows about
2201 QUEUE_FULL now. */
2202 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2203 TAG_PRINTK("scsi%d: target %d lun %d returned "
2204 "QUEUE_FULL after %d commands\n",
2205 HOSTNO, cmd->device->id, cmd->device->lun,
2206 ta->nr_allocated);
2207 if (ta->queue_size > ta->nr_allocated)
2208 ta->nr_allocated = ta->queue_size;
2209 }
2210#else
2211 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2212#endif
2213 /* Enable reselect interrupts */
2214 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2215
2216 /*
2217 * I'm not sure what the correct thing to do here is :
2218 *
2219 * If the command that just executed is NOT a request
2220 * sense, the obvious thing to do is to set the result
2221 * code to the values of the stored parameters.
2222 *
2223 * If it was a REQUEST SENSE command, we need some way to
2224 * differentiate between the failure code of the original
2225 * and the failure code of the REQUEST sense - the obvious
2226 * case is success, where we fall through and leave the
2227 * result code unchanged.
2228 *
2229 * The non-obvious place is where the REQUEST SENSE failed
2230 */
2231
2232 if (cmd->cmnd[0] != REQUEST_SENSE)
2233 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2234 else if (status_byte(cmd->SCp.Status) != GOOD)
2235 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2236
2237#ifdef AUTOSENSE
2238 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2239 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
2240 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
2241 cmd->cmnd[0] = REQUEST_SENSE;
2242 cmd->cmnd[1] &= 0xe0;
2243 cmd->cmnd[2] = 0;
2244 cmd->cmnd[3] = 0;
2245 cmd->cmnd[4] = sizeof(cmd->sense_buffer);
2246 cmd->cmnd[5] = 0;
2247 cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]);
2248
2249 cmd->use_sg = 0;
2250 /* this is initialized from initialize_SCp
2251 cmd->SCp.buffer = NULL;
2252 cmd->SCp.buffers_residual = 0;
2253 */
2254 cmd->request_buffer = (char *) cmd->sense_buffer;
2255 cmd->request_bufflen = sizeof(cmd->sense_buffer);
2256
2257 local_irq_save(flags);
2258 LIST(cmd,hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002259 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002260 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2261 local_irq_restore(flags);
2262 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2263 "issue queue\n", H_NO(cmd));
2264 } else
2265#endif /* def AUTOSENSE */
2266 {
2267#ifdef NCR5380_STATS
2268 collect_stats(hostdata, cmd);
2269#endif
2270 cmd->scsi_done(cmd);
2271 }
2272
2273 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2274 /*
2275 * Restore phase bits to 0 so an interrupted selection,
2276 * arbitration can resume.
2277 */
2278 NCR5380_write(TARGET_COMMAND_REG, 0);
2279
2280 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2281 barrier();
2282
2283 falcon_dont_release--;
2284 /* ++roman: For Falcon SCSI, release the lock on the
2285 * ST-DMA here if no other commands are waiting on the
2286 * disconnected queue.
2287 */
2288 falcon_release_lock_if_possible(hostdata);
2289 return;
2290 case MESSAGE_REJECT:
2291 /* Accept message by clearing ACK */
2292 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2293 /* Enable reselect interrupts */
2294 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2295 switch (hostdata->last_message) {
2296 case HEAD_OF_QUEUE_TAG:
2297 case ORDERED_QUEUE_TAG:
2298 case SIMPLE_QUEUE_TAG:
2299 /* The target obviously doesn't support tagged
2300 * queuing, even though it announced this ability in
2301 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2302 * clear 'tagged_supported' and lock the LUN, since
2303 * the command is treated as untagged further on.
2304 */
2305 cmd->device->tagged_supported = 0;
2306 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2307 cmd->tag = TAG_NONE;
2308 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2309 "QUEUE_TAG message; tagged queuing "
2310 "disabled\n",
2311 HOSTNO, cmd->device->id, cmd->device->lun);
2312 break;
2313 }
2314 break;
2315 case DISCONNECT:
2316 /* Accept message by clearing ACK */
2317 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2318 local_irq_save(flags);
2319 cmd->device->disconnect = 1;
2320 LIST(cmd,hostdata->disconnected_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002321 SET_NEXT(cmd, hostdata->disconnected_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002322 hostdata->connected = NULL;
2323 hostdata->disconnected_queue = cmd;
2324 local_irq_restore(flags);
2325 QU_PRINTK("scsi%d: command for target %d lun %d was "
2326 "moved from connected to the "
2327 "disconnected_queue\n", HOSTNO,
2328 cmd->device->id, cmd->device->lun);
2329 /*
2330 * Restore phase bits to 0 so an interrupted selection,
2331 * arbitration can resume.
2332 */
2333 NCR5380_write(TARGET_COMMAND_REG, 0);
2334
2335 /* Enable reselect interrupts */
2336 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2337 /* Wait for bus free to avoid nasty timeouts */
2338 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2339 barrier();
2340 return;
2341 /*
2342 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2343 * operation, in violation of the SCSI spec so we can safely
2344 * ignore SAVE/RESTORE pointers calls.
2345 *
2346 * Unfortunately, some disks violate the SCSI spec and
2347 * don't issue the required SAVE_POINTERS message before
2348 * disconnecting, and we have to break spec to remain
2349 * compatible.
2350 */
2351 case SAVE_POINTERS:
2352 case RESTORE_POINTERS:
2353 /* Accept message by clearing ACK */
2354 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2355 /* Enable reselect interrupts */
2356 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2357 break;
2358 case EXTENDED_MESSAGE:
2359 /*
2360 * Extended messages are sent in the following format :
2361 * Byte
2362 * 0 EXTENDED_MESSAGE == 1
2363 * 1 length (includes one byte for code, doesn't
2364 * include first two bytes)
2365 * 2 code
2366 * 3..length+1 arguments
2367 *
2368 * Start the extended message buffer with the EXTENDED_MESSAGE
2369 * byte, since spi_print_msg() wants the whole thing.
2370 */
2371 extended_msg[0] = EXTENDED_MESSAGE;
2372 /* Accept first byte by clearing ACK */
2373 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2374
2375 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2376
2377 len = 2;
2378 data = extended_msg + 1;
2379 phase = PHASE_MSGIN;
2380 NCR5380_transfer_pio(instance, &phase, &len, &data);
2381 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2382 (int)extended_msg[1], (int)extended_msg[2]);
2383
2384 if (!len && extended_msg[1] <=
2385 (sizeof(extended_msg) - 1)) {
2386 /* Accept third byte by clearing ACK */
2387 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2388 len = extended_msg[1] - 1;
2389 data = extended_msg + 3;
2390 phase = PHASE_MSGIN;
2391
2392 NCR5380_transfer_pio(instance, &phase, &len, &data);
2393 EXT_PRINTK("scsi%d: message received, residual %d\n",
2394 HOSTNO, len);
2395
2396 switch (extended_msg[2]) {
2397 case EXTENDED_SDTR:
2398 case EXTENDED_WDTR:
2399 case EXTENDED_MODIFY_DATA_POINTER:
2400 case EXTENDED_EXTENDED_IDENTIFY:
2401 tmp = 0;
2402 }
2403 } else if (len) {
2404 printk(KERN_NOTICE "scsi%d: error receiving "
2405 "extended message\n", HOSTNO);
2406 tmp = 0;
2407 } else {
2408 printk(KERN_NOTICE "scsi%d: extended message "
2409 "code %02x length %d is too long\n",
2410 HOSTNO, extended_msg[2], extended_msg[1]);
2411 tmp = 0;
2412 }
2413 /* Fall through to reject message */
2414
2415 /*
2416 * If we get something weird that we aren't expecting,
2417 * reject it.
2418 */
2419 default:
2420 if (!tmp) {
2421 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2422 spi_print_msg(extended_msg);
2423 printk("\n");
2424 } else if (tmp != EXTENDED_MESSAGE)
2425 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2426 "message %02x from target %d, lun %d\n",
2427 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2428 else
2429 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2430 "extended message "
2431 "code %02x, length %d from target %d, lun %d\n",
2432 HOSTNO, extended_msg[1], extended_msg[0],
2433 cmd->device->id, cmd->device->lun);
2434
2435
2436 msgout = MESSAGE_REJECT;
2437 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2438 break;
2439 } /* switch (tmp) */
2440 break;
2441 case PHASE_MSGOUT:
2442 len = 1;
2443 data = &msgout;
2444 hostdata->last_message = msgout;
2445 NCR5380_transfer_pio(instance, &phase, &len, &data);
2446 if (msgout == ABORT) {
2447#ifdef SUPPORT_TAGS
2448 cmd_free_tag(cmd);
2449#else
2450 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2451#endif
2452 hostdata->connected = NULL;
2453 cmd->result = DID_ERROR << 16;
2454#ifdef NCR5380_STATS
2455 collect_stats(hostdata, cmd);
2456#endif
2457 cmd->scsi_done(cmd);
2458 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2459 falcon_release_lock_if_possible(hostdata);
2460 return;
2461 }
2462 msgout = NOP;
2463 break;
2464 case PHASE_CMDOUT:
2465 len = cmd->cmd_len;
2466 data = cmd->cmnd;
2467 /*
2468 * XXX for performance reasons, on machines with a
2469 * PSEUDO-DMA architecture we should probably
2470 * use the dma transfer function.
2471 */
2472 NCR5380_transfer_pio(instance, &phase, &len, &data);
2473 break;
2474 case PHASE_STATIN:
2475 len = 1;
2476 data = &tmp;
2477 NCR5380_transfer_pio(instance, &phase, &len, &data);
2478 cmd->SCp.Status = tmp;
2479 break;
2480 default:
2481 printk("scsi%d: unknown phase\n", HOSTNO);
2482 NCR_PRINT(NDEBUG_ANY);
2483 } /* switch(phase) */
2484 } /* if (tmp * SR_REQ) */
2485 } /* while (1) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002486}
2487
2488/*
2489 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2490 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002491 * Purpose : does reselection, initializing the instance->connected
2492 * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493 * nexus has been reestablished,
Roman Zippelc28bda22007-05-01 22:32:36 +02002494 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002495 * Inputs : instance - this instance of the NCR5380.
2496 *
2497 */
2498
2499
Roman Zippelc28bda22007-05-01 22:32:36 +02002500static void NCR5380_reselect(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002501{
Roman Zippelc28bda22007-05-01 22:32:36 +02002502 SETUP_HOSTDATA(instance);
2503 unsigned char target_mask;
2504 unsigned char lun, phase;
2505 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002507 unsigned char tag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002508#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002509 unsigned char msg[3];
2510 unsigned char *data;
2511 Scsi_Cmnd *tmp = NULL, *prev;
2512/* unsigned long flags; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513
Roman Zippelc28bda22007-05-01 22:32:36 +02002514 /*
2515 * Disable arbitration, etc. since the host adapter obviously
2516 * lost, and tell an interrupted NCR5380_select() to restart.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002517 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518
Roman Zippelc28bda22007-05-01 22:32:36 +02002519 NCR5380_write(MODE_REG, MR_BASE);
2520 hostdata->restart_select = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002521
Roman Zippelc28bda22007-05-01 22:32:36 +02002522 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2523
2524 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2525
2526 /*
2527 * At this point, we have detected that our SCSI ID is on the bus,
2528 * SEL is true and BSY was false for at least one bus settle delay
2529 * (400 ns).
2530 *
2531 * We must assert BSY ourselves, until the target drops the SEL
2532 * signal.
2533 */
2534
2535 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2536
2537 while (NCR5380_read(STATUS_REG) & SR_SEL)
2538 ;
2539 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2540
2541 /*
2542 * Wait for target to go into MSGIN.
2543 */
2544
2545 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2546 ;
2547
2548 len = 1;
2549 data = msg;
2550 phase = PHASE_MSGIN;
2551 NCR5380_transfer_pio(instance, &phase, &len, &data);
2552
2553 if (!(msg[0] & 0x80)) {
2554 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2555 spi_print_msg(msg);
2556 do_abort(instance);
2557 return;
2558 }
2559 lun = (msg[0] & 0x07);
2560
2561#ifdef SUPPORT_TAGS
2562 /* If the phase is still MSGIN, the target wants to send some more
2563 * messages. In case it supports tagged queuing, this is probably a
2564 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2565 */
2566 tag = TAG_NONE;
2567 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2568 /* Accept previous IDENTIFY message by clearing ACK */
2569 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2570 len = 2;
2571 data = msg + 1;
2572 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2573 msg[1] == SIMPLE_QUEUE_TAG)
2574 tag = msg[2];
2575 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2576 "reselection\n", HOSTNO, target_mask, lun, tag);
2577 }
2578#endif
2579
2580 /*
2581 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2582 * just reestablished, and remove it from the disconnected queue.
2583 */
2584
2585 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2586 tmp; prev = tmp, tmp = NEXT(tmp)) {
2587 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2588#ifdef SUPPORT_TAGS
2589 && (tag == tmp->tag)
2590#endif
2591 ) {
2592 /* ++guenther: prevent race with falcon_release_lock */
2593 falcon_dont_release++;
2594 if (prev) {
2595 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02002596 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02002597 } else {
2598 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2599 hostdata->disconnected_queue = NEXT(tmp);
2600 }
Roman Zippel3130d902007-05-01 22:32:37 +02002601 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002602 break;
2603 }
2604 }
2605
2606 if (!tmp) {
2607 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2608#ifdef SUPPORT_TAGS
2609 "tag %d "
2610#endif
2611 "not in disconnected_queue.\n",
2612 HOSTNO, target_mask, lun
2613#ifdef SUPPORT_TAGS
2614 , tag
2615#endif
2616 );
2617 /*
2618 * Since we have an established nexus that we can't do anything
2619 * with, we must abort it.
2620 */
2621 do_abort(instance);
2622 return;
2623 }
2624
2625 /* Accept message by clearing ACK */
2626 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2627
2628 hostdata->connected = tmp;
2629 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2630 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2631 falcon_dont_release--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002632}
2633
2634
2635/*
2636 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2637 *
2638 * Purpose : abort a command
2639 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002640 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2641 * host byte of the result field to, if zero DID_ABORTED is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002642 * used.
2643 *
2644 * Returns : 0 - success, -1 on failure.
2645 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002646 * XXX - there is no way to abort the command that is currently
2647 * connected, you have to wait for it to complete. If this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002648 * a problem, we could implement longjmp() / setjmp(), setjmp()
Roman Zippelc28bda22007-05-01 22:32:36 +02002649 * called where the loop started in NCR5380_main().
Linus Torvalds1da177e2005-04-16 15:20:36 -07002650 */
2651
2652static
Roman Zippelc28bda22007-05-01 22:32:36 +02002653int NCR5380_abort(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002654{
Roman Zippelc28bda22007-05-01 22:32:36 +02002655 struct Scsi_Host *instance = cmd->device->host;
2656 SETUP_HOSTDATA(instance);
2657 Scsi_Cmnd *tmp, **prev;
2658 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002659
Roman Zippelc28bda22007-05-01 22:32:36 +02002660 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2661 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002662
Roman Zippelc28bda22007-05-01 22:32:36 +02002663 NCR5380_print_status(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002664
Roman Zippelc28bda22007-05-01 22:32:36 +02002665 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002666
Roman Zippelc28bda22007-05-01 22:32:36 +02002667 if (!IS_A_TT() && !falcon_got_lock)
2668 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2669 HOSTNO);
2670
2671 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2672 NCR5380_read(BUS_AND_STATUS_REG),
2673 NCR5380_read(STATUS_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002674
2675#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002676 /*
2677 * Case 1 : If the command is the currently executing command,
2678 * we'll set the aborted flag and return control so that
2679 * information transfer routine can exit cleanly.
2680 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002681
Roman Zippelc28bda22007-05-01 22:32:36 +02002682 if (hostdata->connected == cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002683
Roman Zippelc28bda22007-05-01 22:32:36 +02002684 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2685 /*
2686 * We should perform BSY checking, and make sure we haven't slipped
2687 * into BUS FREE.
2688 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002689
Roman Zippelc28bda22007-05-01 22:32:36 +02002690 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2691 /*
2692 * Since we can't change phases until we've completed the current
2693 * handshake, we have to source or sink a byte of data if the current
2694 * phase is not MSGOUT.
2695 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002696
Roman Zippelc28bda22007-05-01 22:32:36 +02002697 /*
2698 * Return control to the executing NCR drive so we can clear the
2699 * aborted flag and get back into our main loop.
2700 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002701
Roman Zippelc28bda22007-05-01 22:32:36 +02002702 if (do_abort(instance) == 0) {
2703 hostdata->aborted = 1;
2704 hostdata->connected = NULL;
2705 cmd->result = DID_ABORT << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002706#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002707 cmd_free_tag(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002708#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002709 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002710#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002711 local_irq_restore(flags);
2712 cmd->scsi_done(cmd);
2713 falcon_release_lock_if_possible(hostdata);
2714 return SCSI_ABORT_SUCCESS;
2715 } else {
2716/* local_irq_restore(flags); */
2717 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2718 return SCSI_ABORT_ERROR;
2719 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002720 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002721#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002722
2723 /*
2724 * Case 2 : If the command hasn't been issued yet, we simply remove it
2725 * from the issue queue.
2726 */
2727 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2728 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2729 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2730 if (cmd == tmp) {
2731 REMOVE(5, *prev, tmp, NEXT(tmp));
2732 (*prev) = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002733 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002734 tmp->result = DID_ABORT << 16;
2735 local_irq_restore(flags);
2736 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2737 HOSTNO);
2738 /* Tagged queuing note: no tag to free here, hasn't been assigned
2739 * yet... */
2740 tmp->scsi_done(tmp);
2741 falcon_release_lock_if_possible(hostdata);
2742 return SCSI_ABORT_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002743 }
2744 }
2745
Roman Zippelc28bda22007-05-01 22:32:36 +02002746 /*
2747 * Case 3 : If any commands are connected, we're going to fail the abort
2748 * and let the high level SCSI driver retry at a later time or
2749 * issue a reset.
2750 *
2751 * Timeouts, and therefore aborted commands, will be highly unlikely
2752 * and handling them cleanly in this situation would make the common
2753 * case of noresets less efficient, and would pollute our code. So,
2754 * we fail.
2755 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002756
Roman Zippelc28bda22007-05-01 22:32:36 +02002757 if (hostdata->connected) {
2758 local_irq_restore(flags);
2759 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2760 return SCSI_ABORT_SNOOZE;
2761 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002762
Roman Zippelc28bda22007-05-01 22:32:36 +02002763 /*
2764 * Case 4: If the command is currently disconnected from the bus, and
2765 * there are no connected commands, we reconnect the I_T_L or
2766 * I_T_L_Q nexus associated with it, go into message out, and send
2767 * an abort message.
2768 *
2769 * This case is especially ugly. In order to reestablish the nexus, we
2770 * need to call NCR5380_select(). The easiest way to implement this
2771 * function was to abort if the bus was busy, and let the interrupt
2772 * handler triggered on the SEL for reselect take care of lost arbitrations
2773 * where necessary, meaning interrupts need to be enabled.
2774 *
2775 * When interrupts are enabled, the queues may change - so we
2776 * can't remove it from the disconnected queue before selecting it
2777 * because that could cause a failure in hashing the nexus if that
2778 * device reselected.
2779 *
2780 * Since the queues may change, we can't use the pointers from when we
2781 * first locate it.
2782 *
2783 * So, we must first locate the command, and if NCR5380_select()
2784 * succeeds, then issue the abort, relocate the command and remove
2785 * it from the disconnected queue.
2786 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002787
Roman Zippelc28bda22007-05-01 22:32:36 +02002788 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2789 tmp = NEXT(tmp)) {
2790 if (cmd == tmp) {
2791 local_irq_restore(flags);
2792 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2793
2794 if (NCR5380_select(instance, cmd, (int)cmd->tag))
2795 return SCSI_ABORT_BUSY;
2796
2797 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2798
2799 do_abort(instance);
2800
2801 local_irq_save(flags);
2802 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2803 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2804 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2805 if (cmd == tmp) {
2806 REMOVE(5, *prev, tmp, NEXT(tmp));
2807 *prev = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002808 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002809 tmp->result = DID_ABORT << 16;
2810 /* We must unlock the tag/LUN immediately here, since the
2811 * target goes to BUS FREE and doesn't send us another
2812 * message (COMMAND_COMPLETE or the like)
2813 */
2814#ifdef SUPPORT_TAGS
2815 cmd_free_tag(tmp);
2816#else
2817 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2818#endif
2819 local_irq_restore(flags);
2820 tmp->scsi_done(tmp);
2821 falcon_release_lock_if_possible(hostdata);
2822 return SCSI_ABORT_SUCCESS;
2823 }
2824 }
2825 }
2826 }
2827
2828 /*
2829 * Case 5 : If we reached this point, the command was not found in any of
2830 * the queues.
2831 *
2832 * We probably reached this point because of an unlikely race condition
2833 * between the command completing successfully and the abortion code,
2834 * so we won't panic, but we will notify the user in case something really
2835 * broke.
2836 */
2837
2838 local_irq_restore(flags);
2839 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n"
2840 KERN_INFO " before abortion\n", HOSTNO);
2841
2842 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2843 * possible at all) At least, we should check if the lock could be
2844 * released after the abort, in case it is kept due to some bug.
2845 */
2846 falcon_release_lock_if_possible(hostdata);
2847
2848 return SCSI_ABORT_NOT_RUNNING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002849}
2850
2851
Roman Zippelc28bda22007-05-01 22:32:36 +02002852/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002853 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
Roman Zippelc28bda22007-05-01 22:32:36 +02002854 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002855 * Purpose : reset the SCSI bus.
2856 *
2857 * Returns : SCSI_RESET_WAKEUP
2858 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002859 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002860
Roman Zippelc28bda22007-05-01 22:32:36 +02002861static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002862{
Roman Zippelc28bda22007-05-01 22:32:36 +02002863 SETUP_HOSTDATA(cmd->device->host);
2864 int i;
2865 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002867 Scsi_Cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002868#endif
2869
Roman Zippelc28bda22007-05-01 22:32:36 +02002870 if (!IS_A_TT() && !falcon_got_lock)
2871 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2872 H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002873
Roman Zippelc28bda22007-05-01 22:32:36 +02002874 NCR5380_print_status(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002875
Roman Zippelc28bda22007-05-01 22:32:36 +02002876 /* get in phase */
2877 NCR5380_write(TARGET_COMMAND_REG,
2878 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2879 /* assert RST */
2880 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2881 udelay(40);
2882 /* reset NCR registers */
2883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2884 NCR5380_write(MODE_REG, MR_BASE);
2885 NCR5380_write(TARGET_COMMAND_REG, 0);
2886 NCR5380_write(SELECT_ENABLE_REG, 0);
2887 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2888 * through anymore ... */
2889 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002890
Roman Zippelc28bda22007-05-01 22:32:36 +02002891#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2892 /* XXX see below XXX */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002893
Roman Zippelc28bda22007-05-01 22:32:36 +02002894 /* MSch: old-style reset: actually abort all command processing here */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002895
Roman Zippelc28bda22007-05-01 22:32:36 +02002896 /* After the reset, there are no more connected or disconnected commands
2897 * and no busy units; to avoid problems with re-inserting the commands
2898 * into the issue_queue (via scsi_done()), the aborted commands are
2899 * remembered in local variables first.
2900 */
2901 local_irq_save(flags);
2902 connected = (Scsi_Cmnd *)hostdata->connected;
2903 hostdata->connected = NULL;
2904 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2905 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002907 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002908#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002909 for (i = 0; i < 8; ++i)
2910 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002911#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002912 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002914 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002915
Roman Zippelc28bda22007-05-01 22:32:36 +02002916 /* In order to tell the mid-level code which commands were aborted,
2917 * set the command status to DID_RESET and call scsi_done() !!!
2918 * This ultimately aborts processing of these commands in the mid-level.
2919 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002920
Roman Zippelc28bda22007-05-01 22:32:36 +02002921 if ((cmd = connected)) {
2922 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2923 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2924 cmd->scsi_done(cmd);
2925 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002926
Roman Zippelc28bda22007-05-01 22:32:36 +02002927 for (i = 0; (cmd = disconnected_queue); ++i) {
2928 disconnected_queue = NEXT(cmd);
Roman Zippel3130d902007-05-01 22:32:37 +02002929 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002930 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2931 cmd->scsi_done(cmd);
2932 }
2933 if (i > 0)
2934 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002935
Roman Zippelc28bda22007-05-01 22:32:36 +02002936 /* The Falcon lock should be released after a reset...
2937 */
2938 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2939 * unlocking and enabling dma interrupt.
2940 */
2941/* falcon_release_lock_if_possible( hostdata );*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07002942
Roman Zippelc28bda22007-05-01 22:32:36 +02002943 /* since all commands have been explicitly terminated, we need to tell
2944 * the midlevel code that the reset was SUCCESSFUL, and there is no
2945 * need to 'wake up' the commands by a request_sense
2946 */
2947 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002948#else /* 1 */
2949
Roman Zippelc28bda22007-05-01 22:32:36 +02002950 /* MSch: new-style reset handling: let the mid-level do what it can */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002951
Roman Zippelc28bda22007-05-01 22:32:36 +02002952 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2953 * Mid-level is supposed to requeue all commands that were active on the
2954 * various low-level queues. In fact it does this, but that's not enough
2955 * because all these commands are subject to timeout. And if a timeout
2956 * happens for any removed command, *_abort() is called but all queues
2957 * are now empty. Abort then gives up the falcon lock, which is fatal,
2958 * since the mid-level will queue more commands and must have the lock
2959 * (it's all happening inside timer interrupt handler!!).
2960 * Even worse, abort will return NOT_RUNNING for all those commands not
2961 * on any queue, so they won't be retried ...
2962 *
2963 * Conclusion: either scsi.c disables timeout for all resetted commands
2964 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2965 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002966
Roman Zippelc28bda22007-05-01 22:32:36 +02002967 /* After the reset, there are no more connected or disconnected commands
2968 * and no busy units; so clear the low-level status here to avoid
2969 * conflicts when the mid-level code tries to wake up the affected
2970 * commands!
2971 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002972
Roman Zippelc28bda22007-05-01 22:32:36 +02002973 if (hostdata->issue_queue)
2974 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2975 if (hostdata->connected)
2976 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2977 if (hostdata->disconnected_queue)
2978 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002979
Roman Zippelc28bda22007-05-01 22:32:36 +02002980 local_irq_save(flags);
2981 hostdata->issue_queue = NULL;
2982 hostdata->connected = NULL;
2983 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002984#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002985 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002986#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002987 for (i = 0; i < 8; ++i)
2988 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002989#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002990 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002991#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002992 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002993
Roman Zippelc28bda22007-05-01 22:32:36 +02002994 /* we did no complete reset of all commands, so a wakeup is required */
2995 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002996#endif /* 1 */
2997}