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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
Lucas De Marchi25985ed2011-03-30 22:57:33 -0300467 * assumed to be already transferred into ptr/this_residual.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 */
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 &&
Geert Uytterhoeven5a1cb472007-10-24 08:55:40 +0200480 virt_to_phys(sg_virt(&cmd->SCp.buffer[1])) == endaddr;) {
Roman Zippelc28bda22007-05-01 22:32:36 +0200481 MER_PRINTK("VTOP(%p) == %08lx -> merging\n",
Geert Uytterhoeven5a1cb472007-10-24 08:55:40 +0200482 page_address(sg_page(&cmd->SCp.buffer[1])), endaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200484 ++cnt;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200486 ++cmd->SCp.buffer;
487 --cmd->SCp.buffers_residual;
488 cmd->SCp.this_residual += cmd->SCp.buffer->length;
489 endaddr += cmd->SCp.buffer->length;
490 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491#if (NDEBUG & NDEBUG_MERGING)
Roman Zippelc28bda22007-05-01 22:32:36 +0200492 if (oldlen != cmd->SCp.this_residual)
493 MER_PRINTK("merged %d buffers from %p, new length %08x\n",
494 cnt, cmd->SCp.ptr, cmd->SCp.this_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495#endif
496}
497
498/*
499 * Function : void initialize_SCp(Scsi_Cmnd *cmd)
500 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200501 * Purpose : initialize the saved data pointers for cmd to point to the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 * start of the buffer.
503 *
504 * Inputs : cmd - Scsi_Cmnd structure to have pointers reset.
505 */
506
Roman Zippelc28bda22007-05-01 22:32:36 +0200507static inline void initialize_SCp(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508{
Roman Zippelc28bda22007-05-01 22:32:36 +0200509 /*
510 * Initialize the Scsi Pointer field so that all of the commands in the
511 * various queues are valid.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 */
Roman Zippelc28bda22007-05-01 22:32:36 +0200513
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200514 if (scsi_bufflen(cmd)) {
515 cmd->SCp.buffer = scsi_sglist(cmd);
516 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Jens Axboe45711f12007-10-22 21:19:53 +0200517 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Roman Zippelc28bda22007-05-01 22:32:36 +0200518 cmd->SCp.this_residual = cmd->SCp.buffer->length;
519 /* ++roman: Try to merge some scatter-buffers if they are at
520 * contiguous physical addresses.
521 */
522 merge_contiguous_buffers(cmd);
523 } else {
524 cmd->SCp.buffer = NULL;
525 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200526 cmd->SCp.ptr = NULL;
527 cmd->SCp.this_residual = 0;
Roman Zippelc28bda22007-05-01 22:32:36 +0200528 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529}
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531#include <linux/delay.h>
532
533#if NDEBUG
534static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200535 unsigned char mask;
536 const char *name;
537} signals[] = {
538 { SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" },
539 { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" },
540 { SR_SEL, "SEL" }, {0, NULL}
541}, basrs[] = {
542 {BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}
543}, icrs[] = {
544 {ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"},
545 {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"},
546 {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"},
547 {0, NULL}
548}, mrs[] = {
549 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"},
550 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR,
551 "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"},
552 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
553 {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"},
554 {0, NULL}
555};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556
557/*
558 * Function : void NCR5380_print(struct Scsi_Host *instance)
559 *
560 * Purpose : print the SCSI bus signals for debugging purposes
561 *
562 * Input : instance - which NCR5380
563 */
564
Roman Zippelc28bda22007-05-01 22:32:36 +0200565static void NCR5380_print(struct Scsi_Host *instance)
566{
567 unsigned char status, data, basr, mr, icr, i;
568 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Roman Zippelc28bda22007-05-01 22:32:36 +0200570 local_irq_save(flags);
571 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
572 status = NCR5380_read(STATUS_REG);
573 mr = NCR5380_read(MODE_REG);
574 icr = NCR5380_read(INITIATOR_COMMAND_REG);
575 basr = NCR5380_read(BUS_AND_STATUS_REG);
576 local_irq_restore(flags);
577 printk("STATUS_REG: %02x ", status);
578 for (i = 0; signals[i].mask; ++i)
579 if (status & signals[i].mask)
580 printk(",%s", signals[i].name);
581 printk("\nBASR: %02x ", basr);
582 for (i = 0; basrs[i].mask; ++i)
583 if (basr & basrs[i].mask)
584 printk(",%s", basrs[i].name);
585 printk("\nICR: %02x ", icr);
586 for (i = 0; icrs[i].mask; ++i)
587 if (icr & icrs[i].mask)
588 printk(",%s", icrs[i].name);
589 printk("\nMODE: %02x ", mr);
590 for (i = 0; mrs[i].mask; ++i)
591 if (mr & mrs[i].mask)
592 printk(",%s", mrs[i].name);
593 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594}
595
596static struct {
Roman Zippelc28bda22007-05-01 22:32:36 +0200597 unsigned char value;
598 const char *name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599} phases[] = {
Roman Zippelc28bda22007-05-01 22:32:36 +0200600 {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"},
601 {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"},
602 {PHASE_UNKNOWN, "UNKNOWN"}
603};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604
Roman Zippelc28bda22007-05-01 22:32:36 +0200605/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 * Function : void NCR5380_print_phase(struct Scsi_Host *instance)
607 *
608 * Purpose : print the current SCSI phase for debugging purposes
609 *
610 * Input : instance - which NCR5380
611 */
612
613static void NCR5380_print_phase(struct Scsi_Host *instance)
614{
Roman Zippelc28bda22007-05-01 22:32:36 +0200615 unsigned char status;
616 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617
Roman Zippelc28bda22007-05-01 22:32:36 +0200618 status = NCR5380_read(STATUS_REG);
619 if (!(status & SR_REQ))
620 printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO);
621 else {
622 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
623 (phases[i].value != (status & PHASE_MASK)); ++i)
624 ;
625 printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name);
626 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627}
628
629#else /* !NDEBUG */
630
631/* dummies... */
Roman Zippelc28bda22007-05-01 22:32:36 +0200632static inline void NCR5380_print(struct Scsi_Host *instance)
633{
634};
635static inline void NCR5380_print_phase(struct Scsi_Host *instance)
636{
637};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639#endif
640
641/*
642 * ++roman: New scheme of calling NCR5380_main()
Roman Zippelc28bda22007-05-01 22:32:36 +0200643 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 * If we're not in an interrupt, we can call our main directly, it cannot be
645 * already running. Else, we queue it on a task queue, if not 'main_running'
646 * tells us that a lower level is already executing it. This way,
647 * 'main_running' needs not be protected in a special way.
648 *
649 * queue_main() is a utility function for putting our main onto the task
650 * queue, if main_running is false. It should be called only from a
651 * interrupt or bottom half.
652 */
653
Tejun Heo5a0e3ad2010-03-24 17:04:11 +0900654#include <linux/gfp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655#include <linux/workqueue.h>
656#include <linux/interrupt.h>
657
Roman Zippelc28bda22007-05-01 22:32:36 +0200658static volatile int main_running;
Geert Uytterhoevenb312b382007-05-01 22:32:48 +0200659static DECLARE_WORK(NCR5380_tqueue, NCR5380_main);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
Roman Zippelc28bda22007-05-01 22:32:36 +0200661static inline void queue_main(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662{
Roman Zippelc28bda22007-05-01 22:32:36 +0200663 if (!main_running) {
664 /* If in interrupt and NCR5380_main() not already running,
665 queue it on the 'immediate' task queue, to be processed
666 immediately after the current interrupt processing has
667 finished. */
668 schedule_work(&NCR5380_tqueue);
669 }
670 /* else: nothing to do: the running NCR5380_main() will pick up
671 any newly queued command. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672}
673
674
Roman Zippelc28bda22007-05-01 22:32:36 +0200675static inline void NCR5380_all_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676{
Roman Zippelc28bda22007-05-01 22:32:36 +0200677 static int done = 0;
678 if (!done) {
679 INI_PRINTK("scsi : NCR5380_all_init()\n");
680 done = 1;
681 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
Roman Zippelc28bda22007-05-01 22:32:36 +0200684
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685/*
686 * Function : void NCR58380_print_options (struct Scsi_Host *instance)
687 *
688 * Purpose : called by probe code indicating the NCR5380 driver
689 * options that were selected.
690 *
691 * Inputs : instance, pointer to this instance. Unused.
692 */
693
Roman Zippelc28bda22007-05-01 22:32:36 +0200694static void __init NCR5380_print_options(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695{
Roman Zippelc28bda22007-05-01 22:32:36 +0200696 printk(" generic options"
697#ifdef AUTOSENSE
698 " AUTOSENSE"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699#endif
700#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +0200701 " REAL DMA"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702#endif
703#ifdef PARITY
Roman Zippelc28bda22007-05-01 22:32:36 +0200704 " PARITY"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705#endif
706#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200707 " SCSI-2 TAGGED QUEUING"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200709 );
710 printk(" generic release=%d", NCR5380_PUBLIC_RELEASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711}
712
713/*
714 * Function : void NCR5380_print_status (struct Scsi_Host *instance)
715 *
716 * Purpose : print commands in the various queues, called from
717 * NCR5380_abort and NCR5380_debug to aid debugging.
718 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200719 * Inputs : instance, pointer to this instance.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 */
721
Al Virod89537e2013-03-31 13:24:44 -0400722static void lprint_Scsi_Cmnd(Scsi_Cmnd *cmd)
723{
724 int i, s;
725 unsigned char *command;
726 printk("scsi%d: destination target %d, lun %d\n",
727 H_NO(cmd), cmd->device->id, cmd->device->lun);
728 printk(KERN_CONT " command = ");
729 command = cmd->cmnd;
730 printk(KERN_CONT "%2d (0x%02x)", command[0], command[0]);
731 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
732 printk(KERN_CONT " %02x", command[i]);
733 printk("\n");
734}
735
Roman Zippelc28bda22007-05-01 22:32:36 +0200736static void NCR5380_print_status(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737{
Al Virod89537e2013-03-31 13:24:44 -0400738 struct NCR5380_hostdata *hostdata;
739 Scsi_Cmnd *ptr;
740 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741
Roman Zippelc28bda22007-05-01 22:32:36 +0200742 NCR_PRINT(NDEBUG_ANY);
743 NCR_PRINT_PHASE(NDEBUG_ANY);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
Roman Zippelc28bda22007-05-01 22:32:36 +0200745 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746
Al Virod89537e2013-03-31 13:24:44 -0400747 printk("\nNCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
Roman Zippelc28bda22007-05-01 22:32:36 +0200748 local_irq_save(flags);
Al Virod89537e2013-03-31 13:24:44 -0400749 printk("NCR5380: coroutine is%s running.\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200750 main_running ? "" : "n't");
Roman Zippelc28bda22007-05-01 22:32:36 +0200751 if (!hostdata->connected)
Al Virod89537e2013-03-31 13:24:44 -0400752 printk("scsi%d: no currently connected command\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +0200753 else
Al Virod89537e2013-03-31 13:24:44 -0400754 lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected);
755 printk("scsi%d: issue_queue\n", HOSTNO);
756 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
757 lprint_Scsi_Cmnd(ptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758
Al Virod89537e2013-03-31 13:24:44 -0400759 printk("scsi%d: disconnected_queue\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +0200760 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
Al Virod89537e2013-03-31 13:24:44 -0400761 ptr = NEXT(ptr))
762 lprint_Scsi_Cmnd(ptr);
Roman Zippelc28bda22007-05-01 22:32:36 +0200763
764 local_irq_restore(flags);
Al Virod89537e2013-03-31 13:24:44 -0400765 printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766}
767
Al Virod89537e2013-03-31 13:24:44 -0400768static void show_Scsi_Cmnd(Scsi_Cmnd *cmd, struct seq_file *m)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769{
Roman Zippelc28bda22007-05-01 22:32:36 +0200770 int i, s;
771 unsigned char *command;
Al Virod89537e2013-03-31 13:24:44 -0400772 seq_printf(m, "scsi%d: destination target %d, lun %d\n",
Roman Zippelc28bda22007-05-01 22:32:36 +0200773 H_NO(cmd), cmd->device->id, cmd->device->lun);
Al Virod89537e2013-03-31 13:24:44 -0400774 seq_printf(m, " command = ");
Roman Zippelc28bda22007-05-01 22:32:36 +0200775 command = cmd->cmnd;
Al Virod89537e2013-03-31 13:24:44 -0400776 seq_printf(m, "%2d (0x%02x)", command[0], command[0]);
Roman Zippelc28bda22007-05-01 22:32:36 +0200777 for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i)
Al Virod89537e2013-03-31 13:24:44 -0400778 seq_printf(m, " %02x", command[i]);
779 seq_printf(m, "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780}
781
Al Virod89537e2013-03-31 13:24:44 -0400782static int NCR5380_show_info(struct seq_file *m, struct Scsi_Host *instance)
783{
784 struct NCR5380_hostdata *hostdata;
785 Scsi_Cmnd *ptr;
786 unsigned long flags;
787
788 hostdata = (struct NCR5380_hostdata *)instance->hostdata;
789
790 seq_printf(m, "NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE);
791 local_irq_save(flags);
792 seq_printf(m, "NCR5380: coroutine is%s running.\n",
793 main_running ? "" : "n't");
794 if (!hostdata->connected)
795 seq_printf(m, "scsi%d: no currently connected command\n", HOSTNO);
796 else
797 show_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, m);
798 seq_printf(m, "scsi%d: issue_queue\n", HOSTNO);
799 for (ptr = (Scsi_Cmnd *)hostdata->issue_queue; ptr; ptr = NEXT(ptr))
800 show_Scsi_Cmnd(ptr, m);
801
802 seq_printf(m, "scsi%d: disconnected_queue\n", HOSTNO);
803 for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr;
804 ptr = NEXT(ptr))
805 show_Scsi_Cmnd(ptr, m);
806
807 local_irq_restore(flags);
808 return 0;
809}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810
Roman Zippelc28bda22007-05-01 22:32:36 +0200811/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 * Function : void NCR5380_init (struct Scsi_Host *instance)
813 *
814 * Purpose : initializes *instance and corresponding 5380 chip.
815 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200816 * Inputs : instance - instantiation of the 5380 driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 *
818 * Notes : I assume that the host, hostno, and id bits have been
Roman Zippelc28bda22007-05-01 22:32:36 +0200819 * set correctly. I don't care about the irq and other fields.
820 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 */
822
Michael Schmitz95fde7a2009-01-18 03:22:15 +0100823static int __init NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
Roman Zippelc28bda22007-05-01 22:32:36 +0200825 int i;
826 SETUP_HOSTDATA(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Roman Zippelc28bda22007-05-01 22:32:36 +0200828 NCR5380_all_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
Roman Zippelc28bda22007-05-01 22:32:36 +0200830 hostdata->aborted = 0;
831 hostdata->id_mask = 1 << instance->this_id;
832 hostdata->id_higher_mask = 0;
833 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
834 if (i > hostdata->id_mask)
835 hostdata->id_higher_mask |= i;
836 for (i = 0; i < 8; ++i)
837 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +0200839 init_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840#endif
841#if defined (REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +0200842 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843#endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200844 hostdata->targets_present = 0;
845 hostdata->connected = NULL;
846 hostdata->issue_queue = NULL;
847 hostdata->disconnected_queue = NULL;
848 hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Roman Zippelc28bda22007-05-01 22:32:36 +0200850 if (!the_template) {
851 the_template = instance->hostt;
852 first_instance = instance;
853 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
855#ifndef AUTOSENSE
Roman Zippelc28bda22007-05-01 22:32:36 +0200856 if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1))
857 printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n"
858 " without AUTOSENSE option, contingent allegiance conditions may\n"
859 " be incorrectly cleared.\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860#endif /* def AUTOSENSE */
861
Roman Zippelc28bda22007-05-01 22:32:36 +0200862 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
863 NCR5380_write(MODE_REG, MR_BASE);
864 NCR5380_write(TARGET_COMMAND_REG, 0);
865 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
Roman Zippelc28bda22007-05-01 22:32:36 +0200867 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868}
869
Geert Uytterhoeven6323e4f2011-06-13 20:39:15 +0200870static void NCR5380_exit(struct Scsi_Host *instance)
871{
872 /* Empty, as we didn't schedule any delayed work */
873}
874
Roman Zippelc28bda22007-05-01 22:32:36 +0200875/*
Roman Zippelc28bda22007-05-01 22:32:36 +0200876 * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd,
877 * void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 *
879 * Purpose : enqueues a SCSI command
880 *
881 * Inputs : cmd - SCSI command, done - function called on completion, with
882 * a pointer to the command descriptor.
Roman Zippelc28bda22007-05-01 22:32:36 +0200883 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884 * Returns : 0
885 *
Roman Zippelc28bda22007-05-01 22:32:36 +0200886 * Side effects :
887 * cmd is added to the per instance issue_queue, with minor
888 * twiddling done to the host specific fields of cmd. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 * main coroutine is not running, it is restarted.
890 *
891 */
892
Jeff Garzikf2812332010-11-16 02:10:29 -0500893static int NCR5380_queue_command_lck(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894{
Roman Zippelc28bda22007-05-01 22:32:36 +0200895 SETUP_HOSTDATA(cmd->device->host);
896 Scsi_Cmnd *tmp;
Roman Zippelc28bda22007-05-01 22:32:36 +0200897 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899#if (NDEBUG & NDEBUG_NO_WRITE)
Roman Zippelc28bda22007-05-01 22:32:36 +0200900 switch (cmd->cmnd[0]) {
901 case WRITE_6:
902 case WRITE_10:
903 printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n",
904 H_NO(cmd));
905 cmd->result = (DID_ERROR << 16);
906 done(cmd);
907 return 0;
908 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
910
Linus Torvalds1da177e2005-04-16 15:20:36 -0700911#ifdef NCR5380_STATS
912# if 0
Roman Zippelc28bda22007-05-01 22:32:36 +0200913 if (!hostdata->connected && !hostdata->issue_queue &&
914 !hostdata->disconnected_queue) {
915 hostdata->timebase = jiffies;
916 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917# endif
918# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200919 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920# endif
Roman Zippelc28bda22007-05-01 22:32:36 +0200921 switch (cmd->cmnd[0]) {
922 case WRITE:
923 case WRITE_6:
924 case WRITE_10:
925 hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200926 hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200927 hostdata->pendingw++;
928 break;
929 case READ:
930 case READ_6:
931 case READ_10:
932 hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200933 hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200934 hostdata->pendingr++;
935 break;
936 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937#endif
938
Roman Zippelc28bda22007-05-01 22:32:36 +0200939 /*
940 * We use the host_scribble field as a pointer to the next command
941 * in a queue
942 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943
Roman Zippel3130d902007-05-01 22:32:37 +0200944 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +0200945 cmd->scsi_done = done;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
Roman Zippelc28bda22007-05-01 22:32:36 +0200947 cmd->result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700948
Roman Zippelc28bda22007-05-01 22:32:36 +0200949 /*
950 * Insert the cmd into the issue queue. Note that REQUEST SENSE
951 * commands are added to the head of the queue since any command will
952 * clear the contingent allegiance condition that exists and the
953 * sense data is only guaranteed to be valid while the condition exists.
954 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Roman Zippelc28bda22007-05-01 22:32:36 +0200956 local_irq_save(flags);
957 /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA.
958 * Otherwise a running NCR5380_main may steal the lock.
959 * Lock before actually inserting due to fairness reasons explained in
960 * atari_scsi.c. If we insert first, then it's impossible for this driver
961 * to release the lock.
962 * Stop timer for this command while waiting for the lock, or timeouts
963 * may happen (and they really do), and it's no good if the command doesn't
964 * appear in any of the queues.
965 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
966 * because also a timer int can trigger an abort or reset, which would
967 * alter queues and touch the lock.
968 */
969 if (!IS_A_TT()) {
Michael Schmitz8ce79552007-06-03 12:55:04 +0200970 /* perhaps stop command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200971 falcon_get_lock();
Michael Schmitz8ce79552007-06-03 12:55:04 +0200972 /* perhaps restart command timer here */
Roman Zippelc28bda22007-05-01 22:32:36 +0200973 }
974 if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) {
975 LIST(cmd, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +0200976 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +0200977 hostdata->issue_queue = cmd;
978 } else {
979 for (tmp = (Scsi_Cmnd *)hostdata->issue_queue;
980 NEXT(tmp); tmp = NEXT(tmp))
981 ;
982 LIST(cmd, tmp);
Roman Zippel3130d902007-05-01 22:32:37 +0200983 SET_NEXT(tmp, cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +0200984 }
985 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986
Roman Zippelc28bda22007-05-01 22:32:36 +0200987 QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd),
988 (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
Roman Zippelc28bda22007-05-01 22:32:36 +0200990 /* If queue_command() is called from an interrupt (real one or bottom
991 * half), we let queue_main() do the job of taking care about main. If it
992 * is already running, this is a no-op, else main will be queued.
993 *
994 * If we're not in an interrupt, we can call NCR5380_main()
995 * unconditionally, because it cannot be already running.
996 */
997 if (in_interrupt() || ((flags >> 8) & 7) >= 6)
998 queue_main();
999 else
1000 NCR5380_main(NULL);
1001 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002}
1003
Jeff Garzikf2812332010-11-16 02:10:29 -05001004static DEF_SCSI_QCMD(NCR5380_queue_command)
1005
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001007 * Function : NCR5380_main (void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001009 * Purpose : NCR5380_main is a coroutine that runs as long as more work can
1010 * be done on the NCR5380 host adapters in a system. Both
1011 * NCR5380_queue_command() and NCR5380_intr() will try to start it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012 * in case it is not running.
Roman Zippelc28bda22007-05-01 22:32:36 +02001013 *
1014 * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 * reenable them. This prevents reentrancy and kernel stack overflow.
Roman Zippelc28bda22007-05-01 22:32:36 +02001016 */
1017
Geert Uytterhoevenb312b382007-05-01 22:32:48 +02001018static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019{
Roman Zippelc28bda22007-05-01 22:32:36 +02001020 Scsi_Cmnd *tmp, *prev;
1021 struct Scsi_Host *instance = first_instance;
1022 struct NCR5380_hostdata *hostdata = HOSTDATA(instance);
1023 int done;
1024 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025
Roman Zippelc28bda22007-05-01 22:32:36 +02001026 /*
1027 * We run (with interrupts disabled) until we're sure that none of
1028 * the host adapters have anything that can be done, at which point
1029 * we set main_running to 0 and exit.
1030 *
1031 * Interrupts are enabled before doing various other internal
1032 * instructions, after we've decided that we need to run through
1033 * the loop again.
1034 *
1035 * this should prevent any race conditions.
1036 *
1037 * ++roman: Just disabling the NCR interrupt isn't sufficient here,
1038 * because also a timer int can trigger an abort or reset, which can
1039 * alter queues and touch the Falcon lock.
1040 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Roman Zippelc28bda22007-05-01 22:32:36 +02001042 /* Tell int handlers main() is now already executing. Note that
1043 no races are possible here. If an int comes in before
1044 'main_running' is set here, and queues/executes main via the
1045 task queue, it doesn't do any harm, just this instance of main
1046 won't find any work left to do. */
1047 if (main_running)
1048 return;
1049 main_running = 1;
1050
1051 local_save_flags(flags);
1052 do {
1053 local_irq_disable(); /* Freeze request queues */
1054 done = 1;
1055
1056 if (!hostdata->connected) {
1057 MAIN_PRINTK("scsi%d: not connected\n", HOSTNO);
1058 /*
1059 * Search through the issue_queue for a command destined
1060 * for a target that's not busy.
1061 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001063 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL;
1064 tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp))
1065 ;
1066 /*printk("%p ", tmp);*/
1067 if ((tmp == prev) && tmp)
1068 printk(" LOOP\n");
1069 /* else printk("\n"); */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001071 for (tmp = (Scsi_Cmnd *) hostdata->issue_queue,
1072 prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073
1074#if (NDEBUG & NDEBUG_LISTS)
Roman Zippelc28bda22007-05-01 22:32:36 +02001075 if (prev != tmp)
1076 printk("MAIN tmp=%p target=%d busy=%d lun=%d\n",
1077 tmp, tmp->device->id, hostdata->busy[tmp->device->id],
1078 tmp->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001080 /* When we find one, remove it from the issue queue. */
1081 /* ++guenther: possible race with Falcon locking */
1082 if (
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001084 !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001086 !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))
1087#endif
1088 ) {
1089 /* ++guenther: just to be sure, this must be atomic */
1090 local_irq_disable();
1091 if (prev) {
1092 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02001093 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02001094 } else {
1095 REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp));
1096 hostdata->issue_queue = NEXT(tmp);
1097 }
Roman Zippel3130d902007-05-01 22:32:37 +02001098 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02001099 falcon_dont_release++;
1100
1101 /* reenable interrupts after finding one */
1102 local_irq_restore(flags);
1103
1104 /*
1105 * Attempt to establish an I_T_L nexus here.
1106 * On success, instance->hostdata->connected is set.
1107 * On failure, we must add the command back to the
1108 * issue queue so we can keep trying.
1109 */
1110 MAIN_PRINTK("scsi%d: main(): command for target %d "
1111 "lun %d removed from issue_queue\n",
1112 HOSTNO, tmp->device->id, tmp->device->lun);
1113 /*
1114 * REQUEST SENSE commands are issued without tagged
1115 * queueing, even on SCSI-II devices because the
1116 * contingent allegiance condition exists for the
1117 * entire unit.
1118 */
1119 /* ++roman: ...and the standard also requires that
1120 * REQUEST SENSE command are untagged.
1121 */
1122
1123#ifdef SUPPORT_TAGS
1124 cmd_get_tag(tmp, tmp->cmnd[0] != REQUEST_SENSE);
1125#endif
1126 if (!NCR5380_select(instance, tmp,
1127 (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE :
1128 TAG_NEXT)) {
1129 falcon_dont_release--;
1130 /* release if target did not response! */
1131 falcon_release_lock_if_possible(hostdata);
1132 break;
1133 } else {
1134 local_irq_disable();
1135 LIST(tmp, hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02001136 SET_NEXT(tmp, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02001137 hostdata->issue_queue = tmp;
1138#ifdef SUPPORT_TAGS
1139 cmd_free_tag(tmp);
1140#endif
1141 falcon_dont_release--;
1142 local_irq_restore(flags);
1143 MAIN_PRINTK("scsi%d: main(): select() failed, "
1144 "returned to issue_queue\n", HOSTNO);
1145 if (hostdata->connected)
1146 break;
1147 }
1148 } /* if target/lun/target queue is not busy */
1149 } /* for issue_queue */
1150 } /* if (!hostdata->connected) */
1151
1152 if (hostdata->connected
1153#ifdef REAL_DMA
1154 && !hostdata->dma_len
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155#endif
1156 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 local_irq_restore(flags);
Roman Zippelc28bda22007-05-01 22:32:36 +02001158 MAIN_PRINTK("scsi%d: main: performing information transfer\n",
1159 HOSTNO);
1160 NCR5380_information_transfer(instance);
1161 MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO);
1162 done = 0;
1163 }
1164 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165
Roman Zippelc28bda22007-05-01 22:32:36 +02001166 /* Better allow ints _after_ 'main_running' has been cleared, else
1167 an interrupt could believe we'll pick up the work it left for
1168 us, but we won't see it anymore here... */
1169 main_running = 0;
1170 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171}
1172
1173
1174#ifdef REAL_DMA
1175/*
1176 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
1177 *
1178 * Purpose : Called by interrupt handler when DMA finishes or a phase
Roman Zippelc28bda22007-05-01 22:32:36 +02001179 * mismatch occurs (which would finish the DMA transfer).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 *
1181 * Inputs : instance - this instance of the NCR5380.
1182 *
1183 */
1184
Roman Zippelc28bda22007-05-01 22:32:36 +02001185static void NCR5380_dma_complete(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186{
Roman Zippelc28bda22007-05-01 22:32:36 +02001187 SETUP_HOSTDATA(instance);
1188 int transfered, saved_data = 0, overrun = 0, cnt, toPIO;
1189 unsigned char **data, p;
1190 volatile int *count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191
Roman Zippelc28bda22007-05-01 22:32:36 +02001192 if (!hostdata->connected) {
1193 printk(KERN_WARNING "scsi%d: received end of DMA interrupt with "
1194 "no connected cmd\n", HOSTNO);
1195 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Roman Zippelc28bda22007-05-01 22:32:36 +02001198 if (atari_read_overruns) {
1199 p = hostdata->connected->SCp.phase;
1200 if (p & SR_IO) {
1201 udelay(10);
1202 if ((NCR5380_read(BUS_AND_STATUS_REG) &
1203 (BASR_PHASE_MATCH|BASR_ACK)) ==
1204 (BASR_PHASE_MATCH|BASR_ACK)) {
1205 saved_data = NCR5380_read(INPUT_DATA_REG);
1206 overrun = 1;
1207 DMA_PRINTK("scsi%d: read overrun handled\n", HOSTNO);
1208 }
1209 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210 }
Roman Zippelc28bda22007-05-01 22:32:36 +02001211
1212 DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n",
1213 HOSTNO, NCR5380_read(BUS_AND_STATUS_REG),
1214 NCR5380_read(STATUS_REG));
1215
1216 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1217 NCR5380_write(MODE_REG, MR_BASE);
1218 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1219
1220 transfered = hostdata->dma_len - NCR5380_dma_residual(instance);
1221 hostdata->dma_len = 0;
1222
1223 data = (unsigned char **)&hostdata->connected->SCp.ptr;
1224 count = &hostdata->connected->SCp.this_residual;
1225 *data += transfered;
1226 *count -= transfered;
1227
1228 if (atari_read_overruns) {
1229 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
1230 cnt = toPIO = atari_read_overruns;
1231 if (overrun) {
1232 DMA_PRINTK("Got an input overrun, using saved byte\n");
1233 *(*data)++ = saved_data;
1234 (*count)--;
1235 cnt--;
1236 toPIO--;
1237 }
1238 DMA_PRINTK("Doing %d-byte PIO to 0x%08lx\n", cnt, (long)*data);
1239 NCR5380_transfer_pio(instance, &p, &cnt, data);
1240 *count -= toPIO - cnt;
1241 }
1242 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243}
1244#endif /* REAL_DMA */
1245
1246
1247/*
1248 * Function : void NCR5380_intr (int irq)
Roman Zippelc28bda22007-05-01 22:32:36 +02001249 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
Roman Zippelc28bda22007-05-01 22:32:36 +02001251 * from the disconnected queue, and restarting NCR5380_main()
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 * as required.
1253 *
1254 * Inputs : int irq, irq that caused this interrupt.
1255 *
1256 */
1257
Roman Zippelc28bda22007-05-01 22:32:36 +02001258static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259{
Roman Zippelc28bda22007-05-01 22:32:36 +02001260 struct Scsi_Host *instance = first_instance;
1261 int done = 1, handled = 0;
1262 unsigned char basr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263
Roman Zippelc28bda22007-05-01 22:32:36 +02001264 INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265
Roman Zippelc28bda22007-05-01 22:32:36 +02001266 /* Look for pending interrupts */
1267 basr = NCR5380_read(BUS_AND_STATUS_REG);
1268 INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr);
1269 /* dispatch to appropriate routine if found and done=0 */
1270 if (basr & BASR_IRQ) {
1271 NCR_PRINT(NDEBUG_INTR);
1272 if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) {
1273 done = 0;
1274 ENABLE_IRQ();
1275 INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO);
1276 NCR5380_reselect(instance);
1277 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1278 } else if (basr & BASR_PARITY_ERROR) {
1279 INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO);
1280 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1281 } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) {
1282 INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO);
1283 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1284 } else {
1285 /*
1286 * The rest of the interrupt conditions can occur only during a
1287 * DMA transfer
1288 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
1290#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001291 /*
1292 * We should only get PHASE MISMATCH and EOP interrupts if we have
1293 * DMA enabled, so do a sanity check based on the current setting
1294 * of the MODE register.
1295 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Roman Zippelc28bda22007-05-01 22:32:36 +02001297 if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) &&
1298 ((basr & BASR_END_DMA_TRANSFER) ||
1299 !(basr & BASR_PHASE_MATCH))) {
1300
1301 INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO);
1302 NCR5380_dma_complete( instance );
1303 done = 0;
1304 ENABLE_IRQ();
1305 } else
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306#endif /* REAL_DMA */
Roman Zippelc28bda22007-05-01 22:32:36 +02001307 {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308/* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */
Roman Zippelc28bda22007-05-01 22:32:36 +02001309 if (basr & BASR_PHASE_MATCH)
1310 printk(KERN_NOTICE "scsi%d: unknown interrupt, "
1311 "BASR 0x%x, MR 0x%x, SR 0x%x\n",
1312 HOSTNO, basr, NCR5380_read(MODE_REG),
1313 NCR5380_read(STATUS_REG));
1314 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1315 }
1316 } /* if !(SELECTION || PARITY) */
1317 handled = 1;
1318 } /* BASR & IRQ */ else {
1319 printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, "
1320 "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr,
1321 NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG));
1322 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1323 }
1324
1325 if (!done) {
1326 INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO);
1327 /* Put a call to NCR5380_main() on the queue... */
1328 queue_main();
1329 }
1330 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331}
1332
1333#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02001334static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335{
1336# ifdef NCR5380_STAT_LIMIT
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001337 if (scsi_bufflen(cmd) > NCR5380_STAT_LIMIT)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338# endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001339 switch (cmd->cmnd[0]) {
1340 case WRITE:
1341 case WRITE_6:
1342 case WRITE_10:
1343 hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001344 /*hostdata->bytes_write[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001345 hostdata->pendingw--;
1346 break;
1347 case READ:
1348 case READ_6:
1349 case READ_10:
1350 hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase);
Boaz Harrosh9e0fe442007-11-05 11:23:35 +02001351 /*hostdata->bytes_read[cmd->device->id] += scsi_bufflen(cmd);*/
Roman Zippelc28bda22007-05-01 22:32:36 +02001352 hostdata->pendingr--;
1353 break;
1354 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355}
1356#endif
1357
Roman Zippelc28bda22007-05-01 22:32:36 +02001358/*
1359 * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 * int tag);
1361 *
1362 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Roman Zippelc28bda22007-05-01 22:32:36 +02001363 * including ARBITRATION, SELECTION, and initial message out for
1364 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001366 * Inputs : instance - instantiation of the 5380 driver on which this
1367 * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for
1368 * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 * the command that is presently connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001371 * Returns : -1 if selection could not execute for some reason,
1372 * 0 if selection succeeded or failed because the target
1373 * did not respond.
1374 *
1375 * Side effects :
1376 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 * with registers as they should have been on entry - ie
1378 * SELECT_ENABLE will be set appropriately, the NCR5380
1379 * will cease to drive any SCSI bus signals.
1380 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001381 * If successful : I_T_L or I_T_L_Q nexus will be established,
1382 * instance->connected will be set to cmd.
1383 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001385 * If failed (no target) : cmd->scsi_done() will be called, and the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001386 * cmd->result host byte set to DID_BAD_TARGET.
1387 */
1388
Roman Zippelc28bda22007-05-01 22:32:36 +02001389static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390{
Roman Zippelc28bda22007-05-01 22:32:36 +02001391 SETUP_HOSTDATA(instance);
1392 unsigned char tmp[3], phase;
1393 unsigned char *data;
1394 int len;
1395 unsigned long timeout;
1396 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397
Roman Zippelc28bda22007-05-01 22:32:36 +02001398 hostdata->restart_select = 0;
1399 NCR_PRINT(NDEBUG_ARBITRATION);
1400 ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO,
1401 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
Roman Zippelc28bda22007-05-01 22:32:36 +02001403 /*
1404 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
1405 * data bus during SELECTION.
1406 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407
Roman Zippelc28bda22007-05-01 22:32:36 +02001408 local_irq_save(flags);
1409 if (hostdata->connected) {
1410 local_irq_restore(flags);
1411 return -1;
1412 }
1413 NCR5380_write(TARGET_COMMAND_REG, 0);
1414
1415 /*
1416 * Start arbitration.
1417 */
1418
1419 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1420 NCR5380_write(MODE_REG, MR_ARBITRATE);
1421
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423
Roman Zippelc28bda22007-05-01 22:32:36 +02001424 /* Wait for arbitration logic to complete */
Michael Schmitzfb810d12007-05-01 22:32:35 +02001425#if defined(NCR_TIMEOUT)
Roman Zippelc28bda22007-05-01 22:32:36 +02001426 {
1427 unsigned long timeout = jiffies + 2*NCR_TIMEOUT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428
Roman Zippelc28bda22007-05-01 22:32:36 +02001429 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1430 time_before(jiffies, timeout) && !hostdata->connected)
1431 ;
1432 if (time_after_eq(jiffies, timeout)) {
1433 printk("scsi : arbitration timeout at %d\n", __LINE__);
1434 NCR5380_write(MODE_REG, MR_BASE);
1435 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1436 return -1;
1437 }
1438 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439#else /* NCR_TIMEOUT */
Roman Zippelc28bda22007-05-01 22:32:36 +02001440 while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) &&
1441 !hostdata->connected)
1442 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443#endif
1444
Roman Zippelc28bda22007-05-01 22:32:36 +02001445 ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
Roman Zippelc28bda22007-05-01 22:32:36 +02001447 if (hostdata->connected) {
1448 NCR5380_write(MODE_REG, MR_BASE);
1449 return -1;
1450 }
1451 /*
1452 * The arbitration delay is 2.2us, but this is a minimum and there is
1453 * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate
1454 * the integral nature of udelay().
1455 *
1456 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457
Roman Zippelc28bda22007-05-01 22:32:36 +02001458 udelay(3);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459
Roman Zippelc28bda22007-05-01 22:32:36 +02001460 /* Check for lost arbitration */
1461 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1462 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1463 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1464 hostdata->connected) {
1465 NCR5380_write(MODE_REG, MR_BASE);
1466 ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n",
1467 HOSTNO);
1468 return -1;
1469 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
Roman Zippelc28bda22007-05-01 22:32:36 +02001471 /* after/during arbitration, BSY should be asserted.
1472 IBM DPES-31080 Version S31Q works now */
1473 /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */
1474 NCR5380_write(INITIATOR_COMMAND_REG,
1475 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
Roman Zippelc28bda22007-05-01 22:32:36 +02001477 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1478 hostdata->connected) {
1479 NCR5380_write(MODE_REG, MR_BASE);
1480 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1481 ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n",
1482 HOSTNO);
1483 return -1;
1484 }
1485
1486 /*
1487 * Again, bus clear + bus settle time is 1.2us, however, this is
1488 * a minimum so we'll udelay ceil(1.2)
1489 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490
1491#ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY
Roman Zippelc28bda22007-05-01 22:32:36 +02001492 /* ++roman: But some targets (see above :-) seem to need a bit more... */
1493 udelay(15);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001495 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001497
1498 if (hostdata->connected) {
1499 NCR5380_write(MODE_REG, MR_BASE);
1500 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1501 return -1;
1502 }
1503
1504 ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO);
1505
1506 /*
1507 * Now that we have won arbitration, start Selection process, asserting
1508 * the host and target ID's on the SCSI bus.
1509 */
1510
1511 NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id)));
1512
1513 /*
1514 * Raise ATN while SEL is true before BSY goes false from arbitration,
1515 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1516 * phase immediately after selection.
1517 */
1518
1519 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY |
1520 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL ));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
Roman Zippelc28bda22007-05-01 22:32:36 +02001523 /*
1524 * Reselect interrupts must be turned off prior to the dropping of BSY,
1525 * otherwise we will trigger an interrupt.
1526 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Roman Zippelc28bda22007-05-01 22:32:36 +02001528 if (hostdata->connected) {
1529 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1530 return -1;
1531 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532
Roman Zippelc28bda22007-05-01 22:32:36 +02001533 NCR5380_write(SELECT_ENABLE_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001534
Roman Zippelc28bda22007-05-01 22:32:36 +02001535 /*
1536 * The initiator shall then wait at least two deskew delays and release
1537 * the BSY signal.
1538 */
1539 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540
Roman Zippelc28bda22007-05-01 22:32:36 +02001541 /* Reset BSY */
1542 NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA |
1543 ICR_ASSERT_ATN | ICR_ASSERT_SEL));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001544
Roman Zippelc28bda22007-05-01 22:32:36 +02001545 /*
1546 * Something weird happens when we cease to drive BSY - looks
1547 * like the board/chip is letting us do another read before the
1548 * appropriate propagation delay has expired, and we're confusing
1549 * a BSY signal from ourselves as the target's response to SELECTION.
1550 *
1551 * A small delay (the 'C++' frontend breaks the pipeline with an
1552 * unnecessary jump, making it work on my 386-33/Trantor T128, the
1553 * tighter 'C' code breaks and requires this) solves the problem -
1554 * the 1 us delay is arbitrary, and only used because this delay will
1555 * be the same on other platforms and since it works here, it should
1556 * work there.
1557 *
1558 * wingel suggests that this could be due to failing to wait
1559 * one deskew delay.
1560 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
Roman Zippelc28bda22007-05-01 22:32:36 +02001562 udelay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001563
Roman Zippelc28bda22007-05-01 22:32:36 +02001564 SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565
Roman Zippelc28bda22007-05-01 22:32:36 +02001566 /*
1567 * The SCSI specification calls for a 250 ms timeout for the actual
1568 * selection.
1569 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570
Roman Zippelc28bda22007-05-01 22:32:36 +02001571 timeout = jiffies + 25;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572
Roman Zippelc28bda22007-05-01 22:32:36 +02001573 /*
1574 * XXX very interesting - we're seeing a bounce where the BSY we
1575 * asserted is being reflected / still asserted (propagation delay?)
1576 * and it's detecting as true. Sigh.
1577 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001578
1579#if 0
Roman Zippelc28bda22007-05-01 22:32:36 +02001580 /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert
1581 * IO while SEL is true. But again, there are some disks out the in the
1582 * world that do that nevertheless. (Somebody claimed that this announces
1583 * reselection capability of the target.) So we better skip that test and
1584 * only wait for BSY... (Famous german words: Der Klügere gibt nach :-)
1585 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001586
Roman Zippelc28bda22007-05-01 22:32:36 +02001587 while (time_before(jiffies, timeout) &&
1588 !(NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO)))
1589 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001590
Roman Zippelc28bda22007-05-01 22:32:36 +02001591 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
1592 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1593 NCR5380_reselect(instance);
1594 printk(KERN_ERR "scsi%d: reselection after won arbitration?\n",
1595 HOSTNO);
1596 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1597 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001599#else
Roman Zippelc28bda22007-05-01 22:32:36 +02001600 while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY))
1601 ;
1602#endif
1603
1604 /*
1605 * No less than two deskew delays after the initiator detects the
1606 * BSY signal is true, it shall release the SEL signal and may
1607 * change the DATA BUS. -wingel
1608 */
1609
1610 udelay(1);
1611
1612 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1613
1614 if (!(NCR5380_read(STATUS_REG) & SR_BSY)) {
1615 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1616 if (hostdata->targets_present & (1 << cmd->device->id)) {
1617 printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO);
1618 if (hostdata->restart_select)
1619 printk(KERN_NOTICE "\trestart select\n");
1620 NCR_PRINT(NDEBUG_ANY);
1621 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1622 return -1;
1623 }
1624 cmd->result = DID_BAD_TARGET << 16;
1625#ifdef NCR5380_STATS
1626 collect_stats(hostdata, cmd);
1627#endif
1628#ifdef SUPPORT_TAGS
1629 cmd_free_tag(cmd);
1630#endif
1631 cmd->scsi_done(cmd);
1632 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1633 SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO);
1634 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1635 return 0;
1636 }
1637
1638 hostdata->targets_present |= (1 << cmd->device->id);
1639
1640 /*
1641 * Since we followed the SCSI spec, and raised ATN while SEL
1642 * was true but before BSY was false during selection, the information
1643 * transfer phase should be a MESSAGE OUT phase so that we can send the
1644 * IDENTIFY message.
1645 *
1646 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1647 * message (2 bytes) with a tag ID that we increment with every command
1648 * until it wraps back to 0.
1649 *
1650 * XXX - it turns out that there are some broken SCSI-II devices,
1651 * which claim to support tagged queuing but fail when more than
1652 * some number of commands are issued at once.
1653 */
1654
1655 /* Wait for start of REQ/ACK handshake */
1656 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
1657 ;
1658
1659 SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n",
1660 HOSTNO, cmd->device->id);
1661 tmp[0] = IDENTIFY(1, cmd->device->lun);
1662
1663#ifdef SUPPORT_TAGS
1664 if (cmd->tag != TAG_NONE) {
1665 tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG;
1666 tmp[2] = cmd->tag;
1667 len = 3;
1668 } else
1669 len = 1;
1670#else
1671 len = 1;
1672 cmd->tag = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673#endif /* SUPPORT_TAGS */
1674
Roman Zippelc28bda22007-05-01 22:32:36 +02001675 /* Send message(s) */
1676 data = tmp;
1677 phase = PHASE_MSGOUT;
1678 NCR5380_transfer_pio(instance, &phase, &len, &data);
1679 SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO);
1680 /* XXX need to handle errors here */
1681 hostdata->connected = cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001682#ifndef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02001683 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
1684#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685
Roman Zippelc28bda22007-05-01 22:32:36 +02001686 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001687
Roman Zippelc28bda22007-05-01 22:32:36 +02001688 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689}
1690
Roman Zippelc28bda22007-05-01 22:32:36 +02001691/*
1692 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001693 * unsigned char *phase, int *count, unsigned char **data)
1694 *
1695 * Purpose : transfers data in given phase using polled I/O
1696 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001697 * Inputs : instance - instance of driver, *phase - pointer to
1698 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001699 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001700 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001701 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001702 * maximum number of bytes, 0 if all bytes are transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 * is in same phase.
1704 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001705 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001706 *
1707 * XXX Note : handling for bus free may be useful.
1708 */
1709
1710/*
Roman Zippelc28bda22007-05-01 22:32:36 +02001711 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 * IS 100% reliable, and for the actual data transfer where speed
1713 * counts, we will always do a pseudo DMA or DMA transfer.
1714 */
1715
Roman Zippelc28bda22007-05-01 22:32:36 +02001716static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1717 unsigned char *phase, int *count,
1718 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719{
Roman Zippelc28bda22007-05-01 22:32:36 +02001720 register unsigned char p = *phase, tmp;
1721 register int c = *count;
1722 register unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723
Roman Zippelc28bda22007-05-01 22:32:36 +02001724 /*
1725 * The NCR5380 chip will only drive the SCSI bus when the
1726 * phase specified in the appropriate bits of the TARGET COMMAND
1727 * REGISTER match the STATUS REGISTER
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728 */
1729
Roman Zippelc28bda22007-05-01 22:32:36 +02001730 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731
Roman Zippelc28bda22007-05-01 22:32:36 +02001732 do {
1733 /*
1734 * Wait for assertion of REQ, after which the phase bits will be
1735 * valid
1736 */
1737 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
1738 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739
Roman Zippelc28bda22007-05-01 22:32:36 +02001740 HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741
Roman Zippelc28bda22007-05-01 22:32:36 +02001742 /* Check for phase mismatch */
1743 if ((tmp & PHASE_MASK) != p) {
1744 PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO);
1745 NCR_PRINT_PHASE(NDEBUG_PIO);
1746 break;
1747 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001748
Roman Zippelc28bda22007-05-01 22:32:36 +02001749 /* Do actual transfer from SCSI bus to / from memory */
1750 if (!(p & SR_IO))
1751 NCR5380_write(OUTPUT_DATA_REG, *d);
1752 else
1753 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754
Roman Zippelc28bda22007-05-01 22:32:36 +02001755 ++d;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001756
Roman Zippelc28bda22007-05-01 22:32:36 +02001757 /*
1758 * The SCSI standard suggests that in MSGOUT phase, the initiator
1759 * should drop ATN on the last byte of the message phase
1760 * after REQ has been asserted for the handshake but before
1761 * the initiator raises ACK.
1762 */
1763
1764 if (!(p & SR_IO)) {
1765 if (!((p & SR_MSG) && c > 1)) {
1766 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1767 NCR_PRINT(NDEBUG_PIO);
1768 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1769 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
1770 } else {
1771 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1772 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
1773 NCR_PRINT(NDEBUG_PIO);
1774 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1775 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
1776 }
1777 } else {
1778 NCR_PRINT(NDEBUG_PIO);
1779 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1780 }
1781
1782 while (NCR5380_read(STATUS_REG) & SR_REQ)
1783 ;
1784
1785 HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO);
1786
1787 /*
1788 * We have several special cases to consider during REQ/ACK handshaking :
1789 * 1. We were in MSGOUT phase, and we are on the last byte of the
1790 * message. ATN must be dropped as ACK is dropped.
1791 *
1792 * 2. We are in a MSGIN phase, and we are on the last byte of the
1793 * message. We must exit with ACK asserted, so that the calling
1794 * code may raise ATN before dropping ACK to reject the message.
1795 *
1796 * 3. ACK and ATN are clear and the target may proceed as normal.
1797 */
1798 if (!(p == PHASE_MSGIN && c == 1)) {
1799 if (p == PHASE_MSGOUT && c > 1)
1800 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1801 else
1802 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1803 }
1804 } while (--c);
1805
1806 PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c);
1807
1808 *count = c;
1809 *data = d;
1810 tmp = NCR5380_read(STATUS_REG);
1811 /* The phase read from the bus is valid if either REQ is (already)
1812 * asserted or if ACK hasn't been released yet. The latter is the case if
1813 * we're in MSGIN and all wanted bytes have been received.
1814 */
1815 if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0))
1816 *phase = tmp & PHASE_MASK;
1817 else
1818 *phase = PHASE_UNKNOWN;
1819
1820 if (!c || (*phase == p))
1821 return 0;
1822 else
1823 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001824}
1825
1826/*
1827 * Function : do_abort (Scsi_Host *host)
Roman Zippelc28bda22007-05-01 22:32:36 +02001828 *
1829 * Purpose : abort the currently established nexus. Should only be
1830 * called from a routine which can drop into a
1831 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 * Returns : 0 on success, -1 on failure.
1833 */
1834
Roman Zippelc28bda22007-05-01 22:32:36 +02001835static int do_abort(struct Scsi_Host *host)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836{
Roman Zippelc28bda22007-05-01 22:32:36 +02001837 unsigned char tmp, *msgptr, phase;
1838 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
Roman Zippelc28bda22007-05-01 22:32:36 +02001840 /* Request message out phase */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001841 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001842
Roman Zippelc28bda22007-05-01 22:32:36 +02001843 /*
1844 * Wait for the target to indicate a valid phase by asserting
1845 * REQ. Once this happens, we'll have either a MSGOUT phase
1846 * and can immediately send the ABORT message, or we'll have some
1847 * other phase and will have to source/sink data.
1848 *
1849 * We really don't care what value was on the bus or what value
1850 * the target sees, so we just handshake.
1851 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001852
Roel Kluin3be38e72007-11-15 21:13:46 +01001853 while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ))
Roman Zippelc28bda22007-05-01 22:32:36 +02001854 ;
1855
1856 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1857
1858 if ((tmp & PHASE_MASK) != PHASE_MSGOUT) {
1859 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1860 ICR_ASSERT_ACK);
1861 while (NCR5380_read(STATUS_REG) & SR_REQ)
1862 ;
1863 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1864 }
1865
1866 tmp = ABORT;
1867 msgptr = &tmp;
1868 len = 1;
1869 phase = PHASE_MSGOUT;
1870 NCR5380_transfer_pio(host, &phase, &len, &msgptr);
1871
1872 /*
1873 * If we got here, and the command completed successfully,
1874 * we're about to go into bus free state.
1875 */
1876
1877 return len ? -1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001878}
1879
1880#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001881/*
1882 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001883 * unsigned char *phase, int *count, unsigned char **data)
1884 *
1885 * Purpose : transfers data in given phase using either real
1886 * or pseudo DMA.
1887 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001888 * Inputs : instance - instance of driver, *phase - pointer to
1889 * what phase is expected, *count - pointer to number of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001890 * bytes to transfer, **data - pointer to data pointer.
Roman Zippelc28bda22007-05-01 22:32:36 +02001891 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001892 * Returns : -1 when different phase is entered without transferring
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001893 * maximum number of bytes, 0 if all bytes or transferred or exit
Linus Torvalds1da177e2005-04-16 15:20:36 -07001894 * is in same phase.
1895 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001896 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 *
1898 */
1899
1900
Roman Zippelc28bda22007-05-01 22:32:36 +02001901static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1902 unsigned char *phase, int *count,
1903 unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904{
Roman Zippelc28bda22007-05-01 22:32:36 +02001905 SETUP_HOSTDATA(instance);
1906 register int c = *count;
1907 register unsigned char p = *phase;
1908 register unsigned char *d = *data;
1909 unsigned char tmp;
1910 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001911
Roman Zippelc28bda22007-05-01 22:32:36 +02001912 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1913 *phase = tmp;
1914 return -1;
1915 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001916
Roman Zippelc28bda22007-05-01 22:32:36 +02001917 if (atari_read_overruns && (p & SR_IO))
1918 c -= atari_read_overruns;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001919
Roman Zippelc28bda22007-05-01 22:32:36 +02001920 DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n",
1921 HOSTNO, (p & SR_IO) ? "reading" : "writing",
1922 c, (p & SR_IO) ? "to" : "from", d);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001923
Roman Zippelc28bda22007-05-01 22:32:36 +02001924 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001925
1926#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02001927 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001928#endif /* def REAL_DMA */
1929
Roman Zippelc28bda22007-05-01 22:32:36 +02001930 if (IS_A_TT()) {
1931 /* On the Medusa, it is a must to initialize the DMA before
1932 * starting the NCR. This is also the cleaner way for the TT.
1933 */
1934 local_irq_save(flags);
1935 hostdata->dma_len = (p & SR_IO) ?
1936 NCR5380_dma_read_setup(instance, d, c) :
1937 NCR5380_dma_write_setup(instance, d, c);
1938 local_irq_restore(flags);
1939 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001940
Roman Zippelc28bda22007-05-01 22:32:36 +02001941 if (p & SR_IO)
1942 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1943 else {
1944 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1945 NCR5380_write(START_DMA_SEND_REG, 0);
1946 }
1947
1948 if (!IS_A_TT()) {
1949 /* On the Falcon, the DMA setup must be done after the last */
1950 /* NCR access, else the DMA setup gets trashed!
1951 */
1952 local_irq_save(flags);
1953 hostdata->dma_len = (p & SR_IO) ?
1954 NCR5380_dma_read_setup(instance, d, c) :
1955 NCR5380_dma_write_setup(instance, d, c);
1956 local_irq_restore(flags);
1957 }
1958 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959}
1960#endif /* defined(REAL_DMA) */
1961
1962/*
1963 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1964 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001965 * Purpose : run through the various SCSI phases and do as the target
1966 * directs us to. Operates on the currently connected command,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 * instance->connected.
1968 *
1969 * Inputs : instance, instance for which we are doing commands
1970 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001971 * Side effects : SCSI things happen, the disconnected queue will be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001972 * modified if a command disconnects, *instance->connected will
1973 * change.
1974 *
Roman Zippelc28bda22007-05-01 22:32:36 +02001975 * XXX Note : we need to watch for bus free or a reset condition here
1976 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001977 */
Roman Zippelc28bda22007-05-01 22:32:36 +02001978
1979static void NCR5380_information_transfer(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980{
Roman Zippelc28bda22007-05-01 22:32:36 +02001981 SETUP_HOSTDATA(instance);
1982 unsigned long flags;
1983 unsigned char msgout = NOP;
1984 int sink = 0;
1985 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001986#if defined(REAL_DMA)
Roman Zippelc28bda22007-05-01 22:32:36 +02001987 int transfersize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02001989 unsigned char *data;
1990 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
1991 Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001992
Roman Zippelc28bda22007-05-01 22:32:36 +02001993 while (1) {
1994 tmp = NCR5380_read(STATUS_REG);
1995 /* We only have a valid SCSI phase when REQ is asserted */
1996 if (tmp & SR_REQ) {
1997 phase = (tmp & PHASE_MASK);
1998 if (phase != old_phase) {
1999 old_phase = phase;
2000 NCR_PRINT_PHASE(NDEBUG_INFORMATION);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002002
Roman Zippelc28bda22007-05-01 22:32:36 +02002003 if (sink && (phase != PHASE_MSGOUT)) {
2004 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002005
Roman Zippelc28bda22007-05-01 22:32:36 +02002006 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
2007 ICR_ASSERT_ACK);
2008 while (NCR5380_read(STATUS_REG) & SR_REQ)
2009 ;
2010 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2011 ICR_ASSERT_ATN);
2012 sink = 0;
2013 continue;
2014 }
2015
2016 switch (phase) {
2017 case PHASE_DATAOUT:
2018#if (NDEBUG & NDEBUG_NO_DATAOUT)
2019 printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT "
2020 "aborted\n", HOSTNO);
2021 sink = 1;
2022 do_abort(instance);
2023 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002024 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002025 return;
2026#endif
2027 case PHASE_DATAIN:
2028 /*
2029 * If there is no room left in the current buffer in the
2030 * scatter-gather list, move onto the next one.
2031 */
2032
2033 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
2034 ++cmd->SCp.buffer;
2035 --cmd->SCp.buffers_residual;
2036 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02002037 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Roman Zippelc28bda22007-05-01 22:32:36 +02002038 /* ++roman: Try to merge some scatter-buffers if
2039 * they are at contiguous physical addresses.
2040 */
2041 merge_contiguous_buffers(cmd);
2042 INF_PRINTK("scsi%d: %d bytes and %d buffers left\n",
2043 HOSTNO, cmd->SCp.this_residual,
2044 cmd->SCp.buffers_residual);
2045 }
2046
2047 /*
2048 * The preferred transfer method is going to be
2049 * PSEUDO-DMA for systems that are strictly PIO,
2050 * since we can let the hardware do the handshaking.
2051 *
2052 * For this to work, we need to know the transfersize
2053 * ahead of time, since the pseudo-DMA code will sit
2054 * in an unconditional loop.
2055 */
2056
2057 /* ++roman: I suggest, this should be
2058 * #if def(REAL_DMA)
2059 * instead of leaving REAL_DMA out.
2060 */
2061
2062#if defined(REAL_DMA)
2063 if (!cmd->device->borken &&
2064 (transfersize = NCR5380_dma_xfer_len(instance,cmd,phase)) > 31) {
2065 len = transfersize;
2066 cmd->SCp.phase = phase;
2067 if (NCR5380_transfer_dma(instance, &phase,
2068 &len, (unsigned char **)&cmd->SCp.ptr)) {
2069 /*
2070 * If the watchdog timer fires, all future
2071 * accesses to this device will use the
2072 * polled-IO. */
2073 printk(KERN_NOTICE "scsi%d: switching target %d "
2074 "lun %d to slow handshake\n", HOSTNO,
2075 cmd->device->id, cmd->device->lun);
2076 cmd->device->borken = 1;
2077 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
2078 ICR_ASSERT_ATN);
2079 sink = 1;
2080 do_abort(instance);
2081 cmd->result = DID_ERROR << 16;
Matthew Wilcoxcce99c62007-09-25 12:42:01 -04002082 cmd->scsi_done(cmd);
Roman Zippelc28bda22007-05-01 22:32:36 +02002083 /* XXX - need to source or sink data here, as appropriate */
2084 } else {
2085#ifdef REAL_DMA
2086 /* ++roman: When using real DMA,
2087 * information_transfer() should return after
2088 * starting DMA since it has nothing more to
2089 * do.
2090 */
2091 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002092#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002093 cmd->SCp.this_residual -= transfersize - len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002095 }
2096 } else
2097#endif /* defined(REAL_DMA) */
2098 NCR5380_transfer_pio(instance, &phase,
2099 (int *)&cmd->SCp.this_residual,
2100 (unsigned char **)&cmd->SCp.ptr);
2101 break;
2102 case PHASE_MSGIN:
2103 len = 1;
2104 data = &tmp;
2105 NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */
2106 NCR5380_transfer_pio(instance, &phase, &len, &data);
2107 cmd->SCp.Message = tmp;
2108
2109 switch (tmp) {
2110 /*
2111 * Linking lets us reduce the time required to get the
2112 * next command out to the device, hopefully this will
2113 * mean we don't waste another revolution due to the delays
2114 * required by ARBITRATION and another SELECTION.
2115 *
2116 * In the current implementation proposal, low level drivers
2117 * merely have to start the next command, pointed to by
2118 * next_link, done() is called as with unlinked commands.
2119 */
2120#ifdef LINKED
2121 case LINKED_CMD_COMPLETE:
2122 case LINKED_FLG_CMD_COMPLETE:
2123 /* Accept message by clearing ACK */
2124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2125
2126 LNK_PRINTK("scsi%d: target %d lun %d linked command "
2127 "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun);
2128
2129 /* Enable reselect interrupts */
2130 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2131 /*
2132 * Sanity check : A linked command should only terminate
2133 * with one of these messages if there are more linked
2134 * commands available.
2135 */
2136
2137 if (!cmd->next_link) {
2138 printk(KERN_NOTICE "scsi%d: target %d lun %d "
2139 "linked command complete, no next_link\n",
2140 HOSTNO, cmd->device->id, cmd->device->lun);
2141 sink = 1;
2142 do_abort(instance);
2143 return;
2144 }
2145
2146 initialize_SCp(cmd->next_link);
2147 /* The next command is still part of this process; copy it
2148 * and don't free it! */
2149 cmd->next_link->tag = cmd->tag;
2150 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2151 LNK_PRINTK("scsi%d: target %d lun %d linked request "
2152 "done, calling scsi_done().\n",
2153 HOSTNO, cmd->device->id, cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002154#ifdef NCR5380_STATS
Roman Zippelc28bda22007-05-01 22:32:36 +02002155 collect_stats(hostdata, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002156#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002157 cmd->scsi_done(cmd);
2158 cmd = hostdata->connected;
2159 break;
2160#endif /* def LINKED */
2161 case ABORT:
2162 case COMMAND_COMPLETE:
2163 /* Accept message by clearing ACK */
2164 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2165 /* ++guenther: possible race with Falcon locking */
2166 falcon_dont_release++;
2167 hostdata->connected = NULL;
2168 QU_PRINTK("scsi%d: command for target %d, lun %d "
2169 "completed\n", HOSTNO, cmd->device->id, cmd->device->lun);
2170#ifdef SUPPORT_TAGS
2171 cmd_free_tag(cmd);
2172 if (status_byte(cmd->SCp.Status) == QUEUE_FULL) {
2173 /* Turn a QUEUE FULL status into BUSY, I think the
2174 * mid level cannot handle QUEUE FULL :-( (The
2175 * command is retried after BUSY). Also update our
2176 * queue size to the number of currently issued
2177 * commands now.
2178 */
2179 /* ++Andreas: the mid level code knows about
2180 QUEUE_FULL now. */
2181 TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun];
2182 TAG_PRINTK("scsi%d: target %d lun %d returned "
2183 "QUEUE_FULL after %d commands\n",
2184 HOSTNO, cmd->device->id, cmd->device->lun,
2185 ta->nr_allocated);
2186 if (ta->queue_size > ta->nr_allocated)
2187 ta->nr_allocated = ta->queue_size;
2188 }
2189#else
2190 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2191#endif
2192 /* Enable reselect interrupts */
2193 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2194
2195 /*
2196 * I'm not sure what the correct thing to do here is :
2197 *
2198 * If the command that just executed is NOT a request
2199 * sense, the obvious thing to do is to set the result
2200 * code to the values of the stored parameters.
2201 *
2202 * If it was a REQUEST SENSE command, we need some way to
2203 * differentiate between the failure code of the original
2204 * and the failure code of the REQUEST sense - the obvious
2205 * case is success, where we fall through and leave the
2206 * result code unchanged.
2207 *
2208 * The non-obvious place is where the REQUEST SENSE failed
2209 */
2210
2211 if (cmd->cmnd[0] != REQUEST_SENSE)
2212 cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8);
2213 else if (status_byte(cmd->SCp.Status) != GOOD)
2214 cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16);
2215
2216#ifdef AUTOSENSE
Boaz Harrosh28424d32007-09-10 22:37:45 +03002217 if ((cmd->cmnd[0] == REQUEST_SENSE) &&
2218 hostdata->ses.cmd_len) {
2219 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
2220 hostdata->ses.cmd_len = 0 ;
2221 }
2222
Roman Zippelc28bda22007-05-01 22:32:36 +02002223 if ((cmd->cmnd[0] != REQUEST_SENSE) &&
2224 (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) {
Boaz Harrosh28424d32007-09-10 22:37:45 +03002225 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
Roman Zippelc28bda22007-05-01 22:32:36 +02002226
Boaz Harrosh28424d32007-09-10 22:37:45 +03002227 ASEN_PRINTK("scsi%d: performing request sense\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002228
2229 local_irq_save(flags);
2230 LIST(cmd,hostdata->issue_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002231 SET_NEXT(cmd, hostdata->issue_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002232 hostdata->issue_queue = (Scsi_Cmnd *) cmd;
2233 local_irq_restore(flags);
2234 QU_PRINTK("scsi%d: REQUEST SENSE added to head of "
2235 "issue queue\n", H_NO(cmd));
2236 } else
2237#endif /* def AUTOSENSE */
2238 {
2239#ifdef NCR5380_STATS
2240 collect_stats(hostdata, cmd);
2241#endif
2242 cmd->scsi_done(cmd);
2243 }
2244
2245 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2246 /*
2247 * Restore phase bits to 0 so an interrupted selection,
2248 * arbitration can resume.
2249 */
2250 NCR5380_write(TARGET_COMMAND_REG, 0);
2251
2252 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2253 barrier();
2254
2255 falcon_dont_release--;
2256 /* ++roman: For Falcon SCSI, release the lock on the
2257 * ST-DMA here if no other commands are waiting on the
2258 * disconnected queue.
2259 */
2260 falcon_release_lock_if_possible(hostdata);
2261 return;
2262 case MESSAGE_REJECT:
2263 /* Accept message by clearing ACK */
2264 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2265 /* Enable reselect interrupts */
2266 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2267 switch (hostdata->last_message) {
2268 case HEAD_OF_QUEUE_TAG:
2269 case ORDERED_QUEUE_TAG:
2270 case SIMPLE_QUEUE_TAG:
2271 /* The target obviously doesn't support tagged
2272 * queuing, even though it announced this ability in
2273 * its INQUIRY data ?!? (maybe only this LUN?) Ok,
2274 * clear 'tagged_supported' and lock the LUN, since
2275 * the command is treated as untagged further on.
2276 */
2277 cmd->device->tagged_supported = 0;
2278 hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun);
2279 cmd->tag = TAG_NONE;
2280 TAG_PRINTK("scsi%d: target %d lun %d rejected "
2281 "QUEUE_TAG message; tagged queuing "
2282 "disabled\n",
2283 HOSTNO, cmd->device->id, cmd->device->lun);
2284 break;
2285 }
2286 break;
2287 case DISCONNECT:
2288 /* Accept message by clearing ACK */
2289 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2290 local_irq_save(flags);
2291 cmd->device->disconnect = 1;
2292 LIST(cmd,hostdata->disconnected_queue);
Roman Zippel3130d902007-05-01 22:32:37 +02002293 SET_NEXT(cmd, hostdata->disconnected_queue);
Roman Zippelc28bda22007-05-01 22:32:36 +02002294 hostdata->connected = NULL;
2295 hostdata->disconnected_queue = cmd;
2296 local_irq_restore(flags);
2297 QU_PRINTK("scsi%d: command for target %d lun %d was "
2298 "moved from connected to the "
2299 "disconnected_queue\n", HOSTNO,
2300 cmd->device->id, cmd->device->lun);
2301 /*
2302 * Restore phase bits to 0 so an interrupted selection,
2303 * arbitration can resume.
2304 */
2305 NCR5380_write(TARGET_COMMAND_REG, 0);
2306
2307 /* Enable reselect interrupts */
2308 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2309 /* Wait for bus free to avoid nasty timeouts */
2310 while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected)
2311 barrier();
2312 return;
2313 /*
2314 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
2315 * operation, in violation of the SCSI spec so we can safely
2316 * ignore SAVE/RESTORE pointers calls.
2317 *
2318 * Unfortunately, some disks violate the SCSI spec and
2319 * don't issue the required SAVE_POINTERS message before
2320 * disconnecting, and we have to break spec to remain
2321 * compatible.
2322 */
2323 case SAVE_POINTERS:
2324 case RESTORE_POINTERS:
2325 /* Accept message by clearing ACK */
2326 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2327 /* Enable reselect interrupts */
2328 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2329 break;
2330 case EXTENDED_MESSAGE:
2331 /*
2332 * Extended messages are sent in the following format :
2333 * Byte
2334 * 0 EXTENDED_MESSAGE == 1
2335 * 1 length (includes one byte for code, doesn't
2336 * include first two bytes)
2337 * 2 code
2338 * 3..length+1 arguments
2339 *
2340 * Start the extended message buffer with the EXTENDED_MESSAGE
2341 * byte, since spi_print_msg() wants the whole thing.
2342 */
2343 extended_msg[0] = EXTENDED_MESSAGE;
2344 /* Accept first byte by clearing ACK */
2345 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2346
2347 EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO);
2348
2349 len = 2;
2350 data = extended_msg + 1;
2351 phase = PHASE_MSGIN;
2352 NCR5380_transfer_pio(instance, &phase, &len, &data);
2353 EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO,
2354 (int)extended_msg[1], (int)extended_msg[2]);
2355
2356 if (!len && extended_msg[1] <=
2357 (sizeof(extended_msg) - 1)) {
2358 /* Accept third byte by clearing ACK */
2359 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2360 len = extended_msg[1] - 1;
2361 data = extended_msg + 3;
2362 phase = PHASE_MSGIN;
2363
2364 NCR5380_transfer_pio(instance, &phase, &len, &data);
2365 EXT_PRINTK("scsi%d: message received, residual %d\n",
2366 HOSTNO, len);
2367
2368 switch (extended_msg[2]) {
2369 case EXTENDED_SDTR:
2370 case EXTENDED_WDTR:
2371 case EXTENDED_MODIFY_DATA_POINTER:
2372 case EXTENDED_EXTENDED_IDENTIFY:
2373 tmp = 0;
2374 }
2375 } else if (len) {
2376 printk(KERN_NOTICE "scsi%d: error receiving "
2377 "extended message\n", HOSTNO);
2378 tmp = 0;
2379 } else {
2380 printk(KERN_NOTICE "scsi%d: extended message "
2381 "code %02x length %d is too long\n",
2382 HOSTNO, extended_msg[2], extended_msg[1]);
2383 tmp = 0;
2384 }
2385 /* Fall through to reject message */
2386
2387 /*
2388 * If we get something weird that we aren't expecting,
2389 * reject it.
2390 */
2391 default:
2392 if (!tmp) {
2393 printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO);
2394 spi_print_msg(extended_msg);
2395 printk("\n");
2396 } else if (tmp != EXTENDED_MESSAGE)
2397 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2398 "message %02x from target %d, lun %d\n",
2399 HOSTNO, tmp, cmd->device->id, cmd->device->lun);
2400 else
2401 printk(KERN_DEBUG "scsi%d: rejecting unknown "
2402 "extended message "
2403 "code %02x, length %d from target %d, lun %d\n",
2404 HOSTNO, extended_msg[1], extended_msg[0],
2405 cmd->device->id, cmd->device->lun);
2406
2407
2408 msgout = MESSAGE_REJECT;
2409 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2410 break;
2411 } /* switch (tmp) */
2412 break;
2413 case PHASE_MSGOUT:
2414 len = 1;
2415 data = &msgout;
2416 hostdata->last_message = msgout;
2417 NCR5380_transfer_pio(instance, &phase, &len, &data);
2418 if (msgout == ABORT) {
2419#ifdef SUPPORT_TAGS
2420 cmd_free_tag(cmd);
2421#else
2422 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2423#endif
2424 hostdata->connected = NULL;
2425 cmd->result = DID_ERROR << 16;
2426#ifdef NCR5380_STATS
2427 collect_stats(hostdata, cmd);
2428#endif
2429 cmd->scsi_done(cmd);
2430 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2431 falcon_release_lock_if_possible(hostdata);
2432 return;
2433 }
2434 msgout = NOP;
2435 break;
2436 case PHASE_CMDOUT:
2437 len = cmd->cmd_len;
2438 data = cmd->cmnd;
2439 /*
2440 * XXX for performance reasons, on machines with a
2441 * PSEUDO-DMA architecture we should probably
2442 * use the dma transfer function.
2443 */
2444 NCR5380_transfer_pio(instance, &phase, &len, &data);
2445 break;
2446 case PHASE_STATIN:
2447 len = 1;
2448 data = &tmp;
2449 NCR5380_transfer_pio(instance, &phase, &len, &data);
2450 cmd->SCp.Status = tmp;
2451 break;
2452 default:
2453 printk("scsi%d: unknown phase\n", HOSTNO);
2454 NCR_PRINT(NDEBUG_ANY);
2455 } /* switch(phase) */
2456 } /* if (tmp * SR_REQ) */
2457 } /* while (1) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458}
2459
2460/*
2461 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2462 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002463 * Purpose : does reselection, initializing the instance->connected
2464 * 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 -07002465 * nexus has been reestablished,
Roman Zippelc28bda22007-05-01 22:32:36 +02002466 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002467 * Inputs : instance - this instance of the NCR5380.
2468 *
2469 */
2470
2471
Roman Zippelc28bda22007-05-01 22:32:36 +02002472static void NCR5380_reselect(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002473{
Roman Zippelc28bda22007-05-01 22:32:36 +02002474 SETUP_HOSTDATA(instance);
2475 unsigned char target_mask;
2476 unsigned char lun, phase;
2477 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002478#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002479 unsigned char tag;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002480#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002481 unsigned char msg[3];
2482 unsigned char *data;
2483 Scsi_Cmnd *tmp = NULL, *prev;
2484/* unsigned long flags; */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002485
Roman Zippelc28bda22007-05-01 22:32:36 +02002486 /*
2487 * Disable arbitration, etc. since the host adapter obviously
2488 * lost, and tell an interrupted NCR5380_select() to restart.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002489 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490
Roman Zippelc28bda22007-05-01 22:32:36 +02002491 NCR5380_write(MODE_REG, MR_BASE);
2492 hostdata->restart_select = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002493
Roman Zippelc28bda22007-05-01 22:32:36 +02002494 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
2495
2496 RSL_PRINTK("scsi%d: reselect\n", HOSTNO);
2497
2498 /*
2499 * At this point, we have detected that our SCSI ID is on the bus,
2500 * SEL is true and BSY was false for at least one bus settle delay
2501 * (400 ns).
2502 *
2503 * We must assert BSY ourselves, until the target drops the SEL
2504 * signal.
2505 */
2506
2507 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
2508
2509 while (NCR5380_read(STATUS_REG) & SR_SEL)
2510 ;
2511 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2512
2513 /*
2514 * Wait for target to go into MSGIN.
2515 */
2516
2517 while (!(NCR5380_read(STATUS_REG) & SR_REQ))
2518 ;
2519
2520 len = 1;
2521 data = msg;
2522 phase = PHASE_MSGIN;
2523 NCR5380_transfer_pio(instance, &phase, &len, &data);
2524
2525 if (!(msg[0] & 0x80)) {
2526 printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO);
2527 spi_print_msg(msg);
2528 do_abort(instance);
2529 return;
2530 }
2531 lun = (msg[0] & 0x07);
2532
2533#ifdef SUPPORT_TAGS
2534 /* If the phase is still MSGIN, the target wants to send some more
2535 * messages. In case it supports tagged queuing, this is probably a
2536 * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus.
2537 */
2538 tag = TAG_NONE;
2539 if (phase == PHASE_MSGIN && setup_use_tagged_queuing) {
2540 /* Accept previous IDENTIFY message by clearing ACK */
2541 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2542 len = 2;
2543 data = msg + 1;
2544 if (!NCR5380_transfer_pio(instance, &phase, &len, &data) &&
2545 msg[1] == SIMPLE_QUEUE_TAG)
2546 tag = msg[2];
2547 TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at "
2548 "reselection\n", HOSTNO, target_mask, lun, tag);
2549 }
2550#endif
2551
2552 /*
2553 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2554 * just reestablished, and remove it from the disconnected queue.
2555 */
2556
2557 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL;
2558 tmp; prev = tmp, tmp = NEXT(tmp)) {
2559 if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun)
2560#ifdef SUPPORT_TAGS
2561 && (tag == tmp->tag)
2562#endif
2563 ) {
2564 /* ++guenther: prevent race with falcon_release_lock */
2565 falcon_dont_release++;
2566 if (prev) {
2567 REMOVE(prev, NEXT(prev), tmp, NEXT(tmp));
Roman Zippel3130d902007-05-01 22:32:37 +02002568 SET_NEXT(prev, NEXT(tmp));
Roman Zippelc28bda22007-05-01 22:32:36 +02002569 } else {
2570 REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp));
2571 hostdata->disconnected_queue = NEXT(tmp);
2572 }
Roman Zippel3130d902007-05-01 22:32:37 +02002573 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002574 break;
2575 }
2576 }
2577
2578 if (!tmp) {
2579 printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d "
2580#ifdef SUPPORT_TAGS
2581 "tag %d "
2582#endif
2583 "not in disconnected_queue.\n",
2584 HOSTNO, target_mask, lun
2585#ifdef SUPPORT_TAGS
2586 , tag
2587#endif
2588 );
2589 /*
2590 * Since we have an established nexus that we can't do anything
2591 * with, we must abort it.
2592 */
2593 do_abort(instance);
2594 return;
2595 }
2596
2597 /* Accept message by clearing ACK */
2598 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2599
2600 hostdata->connected = tmp;
2601 RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n",
2602 HOSTNO, tmp->device->id, tmp->device->lun, tmp->tag);
2603 falcon_dont_release--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002604}
2605
2606
2607/*
2608 * Function : int NCR5380_abort (Scsi_Cmnd *cmd)
2609 *
2610 * Purpose : abort a command
2611 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002612 * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the
2613 * host byte of the result field to, if zero DID_ABORTED is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002614 * used.
2615 *
2616 * Returns : 0 - success, -1 on failure.
2617 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002618 * XXX - there is no way to abort the command that is currently
2619 * connected, you have to wait for it to complete. If this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002620 * a problem, we could implement longjmp() / setjmp(), setjmp()
Roman Zippelc28bda22007-05-01 22:32:36 +02002621 * called where the loop started in NCR5380_main().
Linus Torvalds1da177e2005-04-16 15:20:36 -07002622 */
2623
2624static
Roman Zippelc28bda22007-05-01 22:32:36 +02002625int NCR5380_abort(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002626{
Roman Zippelc28bda22007-05-01 22:32:36 +02002627 struct Scsi_Host *instance = cmd->device->host;
2628 SETUP_HOSTDATA(instance);
2629 Scsi_Cmnd *tmp, **prev;
2630 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002631
Roman Zippelc28bda22007-05-01 22:32:36 +02002632 printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO);
2633 scsi_print_command(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002634
Roman Zippelc28bda22007-05-01 22:32:36 +02002635 NCR5380_print_status(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002636
Roman Zippelc28bda22007-05-01 22:32:36 +02002637 local_irq_save(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638
Roman Zippelc28bda22007-05-01 22:32:36 +02002639 if (!IS_A_TT() && !falcon_got_lock)
2640 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_abort\n",
2641 HOSTNO);
2642
2643 ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO,
2644 NCR5380_read(BUS_AND_STATUS_REG),
2645 NCR5380_read(STATUS_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002646
2647#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002648 /*
2649 * Case 1 : If the command is the currently executing command,
2650 * we'll set the aborted flag and return control so that
2651 * information transfer routine can exit cleanly.
2652 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002653
Roman Zippelc28bda22007-05-01 22:32:36 +02002654 if (hostdata->connected == cmd) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002655
Roman Zippelc28bda22007-05-01 22:32:36 +02002656 ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO);
2657 /*
2658 * We should perform BSY checking, and make sure we haven't slipped
2659 * into BUS FREE.
2660 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002661
Roman Zippelc28bda22007-05-01 22:32:36 +02002662 /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */
2663 /*
2664 * Since we can't change phases until we've completed the current
2665 * handshake, we have to source or sink a byte of data if the current
2666 * phase is not MSGOUT.
2667 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002668
Roman Zippelc28bda22007-05-01 22:32:36 +02002669 /*
2670 * Return control to the executing NCR drive so we can clear the
2671 * aborted flag and get back into our main loop.
2672 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002673
Roman Zippelc28bda22007-05-01 22:32:36 +02002674 if (do_abort(instance) == 0) {
2675 hostdata->aborted = 1;
2676 hostdata->connected = NULL;
2677 cmd->result = DID_ABORT << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002678#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002679 cmd_free_tag(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002680#else
Roman Zippelc28bda22007-05-01 22:32:36 +02002681 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002682#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002683 local_irq_restore(flags);
2684 cmd->scsi_done(cmd);
2685 falcon_release_lock_if_possible(hostdata);
2686 return SCSI_ABORT_SUCCESS;
2687 } else {
2688/* local_irq_restore(flags); */
2689 printk("scsi%d: abort of connected command failed!\n", HOSTNO);
2690 return SCSI_ABORT_ERROR;
2691 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002692 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002693#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002694
2695 /*
2696 * Case 2 : If the command hasn't been issued yet, we simply remove it
2697 * from the issue queue.
2698 */
2699 for (prev = (Scsi_Cmnd **)&(hostdata->issue_queue),
2700 tmp = (Scsi_Cmnd *)hostdata->issue_queue;
2701 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2702 if (cmd == tmp) {
2703 REMOVE(5, *prev, tmp, NEXT(tmp));
2704 (*prev) = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002705 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002706 tmp->result = DID_ABORT << 16;
2707 local_irq_restore(flags);
2708 ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n",
2709 HOSTNO);
2710 /* Tagged queuing note: no tag to free here, hasn't been assigned
2711 * yet... */
2712 tmp->scsi_done(tmp);
2713 falcon_release_lock_if_possible(hostdata);
2714 return SCSI_ABORT_SUCCESS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002715 }
2716 }
2717
Roman Zippelc28bda22007-05-01 22:32:36 +02002718 /*
2719 * Case 3 : If any commands are connected, we're going to fail the abort
2720 * and let the high level SCSI driver retry at a later time or
2721 * issue a reset.
2722 *
2723 * Timeouts, and therefore aborted commands, will be highly unlikely
2724 * and handling them cleanly in this situation would make the common
2725 * case of noresets less efficient, and would pollute our code. So,
2726 * we fail.
2727 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002728
Roman Zippelc28bda22007-05-01 22:32:36 +02002729 if (hostdata->connected) {
2730 local_irq_restore(flags);
2731 ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO);
2732 return SCSI_ABORT_SNOOZE;
2733 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002734
Roman Zippelc28bda22007-05-01 22:32:36 +02002735 /*
2736 * Case 4: If the command is currently disconnected from the bus, and
2737 * there are no connected commands, we reconnect the I_T_L or
2738 * I_T_L_Q nexus associated with it, go into message out, and send
2739 * an abort message.
2740 *
2741 * This case is especially ugly. In order to reestablish the nexus, we
2742 * need to call NCR5380_select(). The easiest way to implement this
2743 * function was to abort if the bus was busy, and let the interrupt
2744 * handler triggered on the SEL for reselect take care of lost arbitrations
2745 * where necessary, meaning interrupts need to be enabled.
2746 *
2747 * When interrupts are enabled, the queues may change - so we
2748 * can't remove it from the disconnected queue before selecting it
2749 * because that could cause a failure in hashing the nexus if that
2750 * device reselected.
2751 *
2752 * Since the queues may change, we can't use the pointers from when we
2753 * first locate it.
2754 *
2755 * So, we must first locate the command, and if NCR5380_select()
2756 * succeeds, then issue the abort, relocate the command and remove
2757 * it from the disconnected queue.
2758 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002759
Roman Zippelc28bda22007-05-01 22:32:36 +02002760 for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp;
2761 tmp = NEXT(tmp)) {
2762 if (cmd == tmp) {
2763 local_irq_restore(flags);
2764 ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO);
2765
2766 if (NCR5380_select(instance, cmd, (int)cmd->tag))
2767 return SCSI_ABORT_BUSY;
2768
2769 ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO);
2770
2771 do_abort(instance);
2772
2773 local_irq_save(flags);
2774 for (prev = (Scsi_Cmnd **)&(hostdata->disconnected_queue),
2775 tmp = (Scsi_Cmnd *)hostdata->disconnected_queue;
2776 tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp)) {
2777 if (cmd == tmp) {
2778 REMOVE(5, *prev, tmp, NEXT(tmp));
2779 *prev = NEXT(tmp);
Roman Zippel3130d902007-05-01 22:32:37 +02002780 SET_NEXT(tmp, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002781 tmp->result = DID_ABORT << 16;
2782 /* We must unlock the tag/LUN immediately here, since the
2783 * target goes to BUS FREE and doesn't send us another
2784 * message (COMMAND_COMPLETE or the like)
2785 */
2786#ifdef SUPPORT_TAGS
2787 cmd_free_tag(tmp);
2788#else
2789 hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun);
2790#endif
2791 local_irq_restore(flags);
2792 tmp->scsi_done(tmp);
2793 falcon_release_lock_if_possible(hostdata);
2794 return SCSI_ABORT_SUCCESS;
2795 }
2796 }
2797 }
2798 }
2799
2800 /*
2801 * Case 5 : If we reached this point, the command was not found in any of
2802 * the queues.
2803 *
2804 * We probably reached this point because of an unlikely race condition
2805 * between the command completing successfully and the abortion code,
2806 * so we won't panic, but we will notify the user in case something really
2807 * broke.
2808 */
2809
2810 local_irq_restore(flags);
Joe Perchesad361c92009-07-06 13:05:40 -07002811 printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully before abortion\n", HOSTNO);
Roman Zippelc28bda22007-05-01 22:32:36 +02002812
2813 /* Maybe it is sufficient just to release the ST-DMA lock... (if
2814 * possible at all) At least, we should check if the lock could be
2815 * released after the abort, in case it is kept due to some bug.
2816 */
2817 falcon_release_lock_if_possible(hostdata);
2818
2819 return SCSI_ABORT_NOT_RUNNING;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002820}
2821
2822
Roman Zippelc28bda22007-05-01 22:32:36 +02002823/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002824 * Function : int NCR5380_reset (Scsi_Cmnd *cmd)
Roman Zippelc28bda22007-05-01 22:32:36 +02002825 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002826 * Purpose : reset the SCSI bus.
2827 *
2828 * Returns : SCSI_RESET_WAKEUP
2829 *
Roman Zippelc28bda22007-05-01 22:32:36 +02002830 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002831
Roman Zippelc28bda22007-05-01 22:32:36 +02002832static int NCR5380_bus_reset(Scsi_Cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002833{
Roman Zippelc28bda22007-05-01 22:32:36 +02002834 SETUP_HOSTDATA(cmd->device->host);
2835 int i;
2836 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002837#if 1
Roman Zippelc28bda22007-05-01 22:32:36 +02002838 Scsi_Cmnd *connected, *disconnected_queue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002839#endif
2840
Roman Zippelc28bda22007-05-01 22:32:36 +02002841 if (!IS_A_TT() && !falcon_got_lock)
2842 printk(KERN_ERR "scsi%d: !!BINGO!! Falcon has no lock in NCR5380_reset\n",
2843 H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002844
Roman Zippelc28bda22007-05-01 22:32:36 +02002845 NCR5380_print_status(cmd->device->host);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002846
Roman Zippelc28bda22007-05-01 22:32:36 +02002847 /* get in phase */
2848 NCR5380_write(TARGET_COMMAND_REG,
2849 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG)));
2850 /* assert RST */
2851 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
2852 udelay(40);
2853 /* reset NCR registers */
2854 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2855 NCR5380_write(MODE_REG, MR_BASE);
2856 NCR5380_write(TARGET_COMMAND_REG, 0);
2857 NCR5380_write(SELECT_ENABLE_REG, 0);
2858 /* ++roman: reset interrupt condition! otherwise no interrupts don't get
2859 * through anymore ... */
2860 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002861
Roman Zippelc28bda22007-05-01 22:32:36 +02002862#if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */
2863 /* XXX see below XXX */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002864
Roman Zippelc28bda22007-05-01 22:32:36 +02002865 /* MSch: old-style reset: actually abort all command processing here */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002866
Roman Zippelc28bda22007-05-01 22:32:36 +02002867 /* After the reset, there are no more connected or disconnected commands
2868 * and no busy units; to avoid problems with re-inserting the commands
2869 * into the issue_queue (via scsi_done()), the aborted commands are
2870 * remembered in local variables first.
2871 */
2872 local_irq_save(flags);
2873 connected = (Scsi_Cmnd *)hostdata->connected;
2874 hostdata->connected = NULL;
2875 disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue;
2876 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002877#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002878 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002879#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002880 for (i = 0; i < 8; ++i)
2881 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002882#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002883 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002884#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002885 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002886
Roman Zippelc28bda22007-05-01 22:32:36 +02002887 /* In order to tell the mid-level code which commands were aborted,
2888 * set the command status to DID_RESET and call scsi_done() !!!
2889 * This ultimately aborts processing of these commands in the mid-level.
2890 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002891
Roman Zippelc28bda22007-05-01 22:32:36 +02002892 if ((cmd = connected)) {
2893 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2894 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2895 cmd->scsi_done(cmd);
2896 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002897
Roman Zippelc28bda22007-05-01 22:32:36 +02002898 for (i = 0; (cmd = disconnected_queue); ++i) {
2899 disconnected_queue = NEXT(cmd);
Roman Zippel3130d902007-05-01 22:32:37 +02002900 SET_NEXT(cmd, NULL);
Roman Zippelc28bda22007-05-01 22:32:36 +02002901 cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16);
2902 cmd->scsi_done(cmd);
2903 }
2904 if (i > 0)
2905 ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002906
Roman Zippelc28bda22007-05-01 22:32:36 +02002907 /* The Falcon lock should be released after a reset...
2908 */
2909 /* ++guenther: moved to atari_scsi_reset(), to prevent a race between
2910 * unlocking and enabling dma interrupt.
2911 */
2912/* falcon_release_lock_if_possible( hostdata );*/
Linus Torvalds1da177e2005-04-16 15:20:36 -07002913
Roman Zippelc28bda22007-05-01 22:32:36 +02002914 /* since all commands have been explicitly terminated, we need to tell
2915 * the midlevel code that the reset was SUCCESSFUL, and there is no
2916 * need to 'wake up' the commands by a request_sense
2917 */
2918 return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002919#else /* 1 */
2920
Roman Zippelc28bda22007-05-01 22:32:36 +02002921 /* MSch: new-style reset handling: let the mid-level do what it can */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002922
Roman Zippelc28bda22007-05-01 22:32:36 +02002923 /* ++guenther: MID-LEVEL IS STILL BROKEN.
2924 * Mid-level is supposed to requeue all commands that were active on the
2925 * various low-level queues. In fact it does this, but that's not enough
2926 * because all these commands are subject to timeout. And if a timeout
2927 * happens for any removed command, *_abort() is called but all queues
2928 * are now empty. Abort then gives up the falcon lock, which is fatal,
2929 * since the mid-level will queue more commands and must have the lock
2930 * (it's all happening inside timer interrupt handler!!).
2931 * Even worse, abort will return NOT_RUNNING for all those commands not
2932 * on any queue, so they won't be retried ...
2933 *
2934 * Conclusion: either scsi.c disables timeout for all resetted commands
2935 * immediately, or we lose! As of linux-2.0.20 it doesn't.
2936 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002937
Roman Zippelc28bda22007-05-01 22:32:36 +02002938 /* After the reset, there are no more connected or disconnected commands
2939 * and no busy units; so clear the low-level status here to avoid
2940 * conflicts when the mid-level code tries to wake up the affected
2941 * commands!
2942 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002943
Roman Zippelc28bda22007-05-01 22:32:36 +02002944 if (hostdata->issue_queue)
2945 ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd));
2946 if (hostdata->connected)
2947 ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd));
2948 if (hostdata->disconnected_queue)
2949 ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002950
Roman Zippelc28bda22007-05-01 22:32:36 +02002951 local_irq_save(flags);
2952 hostdata->issue_queue = NULL;
2953 hostdata->connected = NULL;
2954 hostdata->disconnected_queue = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002955#ifdef SUPPORT_TAGS
Roman Zippelc28bda22007-05-01 22:32:36 +02002956 free_all_tags();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002957#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002958 for (i = 0; i < 8; ++i)
2959 hostdata->busy[i] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002960#ifdef REAL_DMA
Roman Zippelc28bda22007-05-01 22:32:36 +02002961 hostdata->dma_len = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002962#endif
Roman Zippelc28bda22007-05-01 22:32:36 +02002963 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002964
Roman Zippelc28bda22007-05-01 22:32:36 +02002965 /* we did no complete reset of all commands, so a wakeup is required */
2966 return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002967#endif /* 1 */
2968}