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Finn Thainaff0cf92016-01-03 16:06:09 +11001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NCR 5380 generic driver routines. These should make it *trivial*
Finn Thain594d4ba2016-01-03 16:06:10 +11003 * to implement 5380 SCSI drivers under Linux with a non-trantor
4 * architecture.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
Finn Thain594d4ba2016-01-03 16:06:10 +11006 * Note that these routines also work with NR53c400 family chips.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 *
8 * Copyright 1993, Drew Eckhardt
Finn Thain594d4ba2016-01-03 16:06:10 +11009 * Visionary Computing
10 * (Unix and Linux consulting and custom programming)
11 * drew@colorado.edu
12 * +1 (303) 666-5836
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Finn Thainaff0cf92016-01-03 16:06:09 +110014 * For more information, please consult
Linus Torvalds1da177e2005-04-16 15:20:36 -070015 *
16 * NCR 5380 Family
17 * SCSI Protocol Controller
18 * Databook
19 *
20 * NCR Microelectronics
21 * 1635 Aeroplaza Drive
22 * Colorado Springs, CO 80916
23 * 1+ (719) 578-3400
24 * 1+ (800) 334-5454
25 */
26
27/*
Finn Thainc16df322016-01-03 16:06:08 +110028 * With contributions from Ray Van Tassle, Ingmar Baumgart,
29 * Ronald van Cuijlenborg, Alan Cox and others.
Linus Torvalds1da177e2005-04-16 15:20:36 -070030 */
31
Finn Thain52d3e562016-03-23 21:10:20 +110032/* Ported to Atari by Roman Hodek and others. */
33
Finn Thaine9db3192016-03-23 21:10:21 +110034/* Adapted for the Sun 3 by Sam Creasey. */
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * Design
38 *
Finn Thainaff0cf92016-01-03 16:06:09 +110039 * This is a generic 5380 driver. To use it on a different platform,
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 * one simply writes appropriate system specific macros (ie, data
Finn Thainaff0cf92016-01-03 16:06:09 +110041 * transfer - some PC's will use the I/O bus, 68K's must use
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * memory mapped) and drops this file in their 'C' wrapper.
43 *
Finn Thainaff0cf92016-01-03 16:06:09 +110044 * As far as command queueing, two queues are maintained for
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 * each 5380 in the system - commands that haven't been issued yet,
Finn Thainaff0cf92016-01-03 16:06:09 +110046 * and commands that are currently executing. This means that an
47 * unlimited number of commands may be queued, letting
48 * more commands propagate from the higher driver levels giving higher
49 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
50 * allowing multiple commands to propagate all the way to a SCSI-II device
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 * while a command is already executing.
52 *
53 *
Finn Thainaff0cf92016-01-03 16:06:09 +110054 * Issues specific to the NCR5380 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 *
Finn Thainaff0cf92016-01-03 16:06:09 +110056 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
57 * piece of hardware that requires you to sit in a loop polling for
58 * the REQ signal as long as you are connected. Some devices are
59 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
Finn Thain686f3992016-01-03 16:05:26 +110060 * while doing long seek operations. [...] These
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 * broken devices are the exception rather than the rule and I'd rather
62 * spend my time optimizing for the normal case.
63 *
64 * Architecture :
65 *
66 * At the heart of the design is a coroutine, NCR5380_main,
67 * which is started from a workqueue for each NCR5380 host in the
68 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
69 * removing the commands from the issue queue and calling
Finn Thainaff0cf92016-01-03 16:06:09 +110070 * NCR5380_select() if a nexus is not established.
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 *
72 * Once a nexus is established, the NCR5380_information_transfer()
73 * phase goes through the various phases as instructed by the target.
74 * if the target goes into MSG IN and sends a DISCONNECT message,
75 * the command structure is placed into the per instance disconnected
Finn Thainaff0cf92016-01-03 16:06:09 +110076 * queue, and NCR5380_main tries to find more work. If the target is
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 * idle for too long, the system will try to sleep.
78 *
79 * If a command has disconnected, eventually an interrupt will trigger,
80 * calling NCR5380_intr() which will in turn call NCR5380_reselect
81 * to reestablish a nexus. This will run main if necessary.
82 *
Finn Thainaff0cf92016-01-03 16:06:09 +110083 * On command termination, the done function will be called as
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 * appropriate.
85 *
Finn Thainaff0cf92016-01-03 16:06:09 +110086 * SCSI pointers are maintained in the SCp field of SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 * structures, being initialized after the command is connected
88 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
89 * Note that in violation of the standard, an implicit SAVE POINTERS operation
90 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
91 */
92
93/*
94 * Using this file :
95 * This file a skeleton Linux SCSI driver for the NCR 5380 series
Finn Thainaff0cf92016-01-03 16:06:09 +110096 * of chips. To use it, you write an architecture specific functions
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 * and macros and include this file in your driver.
98 *
Finn Thainaff0cf92016-01-03 16:06:09 +110099 * These macros control options :
100 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
Finn Thain594d4ba2016-01-03 16:06:10 +1100101 * defined.
Finn Thainaff0cf92016-01-03 16:06:09 +1100102 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
Finn Thain594d4ba2016-01-03 16:06:10 +1100104 * for commands that return with a CHECK CONDITION status.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 *
106 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
Finn Thain594d4ba2016-01-03 16:06:10 +1100107 * transceivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
110 *
Finn Thain8053b0e2016-03-23 21:10:19 +1100111 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
112 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * These macros MUST be defined :
Finn Thainaff0cf92016-01-03 16:06:09 +1100114 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * NCR5380_read(register) - read from the specified register
116 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100117 * NCR5380_write(register, value) - write to the specific register
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100119 * NCR5380_implementation_fields - additional fields needed for this
Finn Thain594d4ba2016-01-03 16:06:10 +1100120 * specific implementation of the NCR5380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 *
122 * Either real DMA *or* pseudo DMA may be implemented
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 * NCR5380_dma_write_setup(instance, src, count) - initialize
125 * NCR5380_dma_read_setup(instance, dst, count) - initialize
126 * NCR5380_dma_residual(instance); - residual count
127 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 * The generic driver is initialized by calling NCR5380_init(instance),
Finn Thainaff0cf92016-01-03 16:06:09 +1100129 * after setting the appropriate host specific fields and ID. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
131 * possible) function may be used.
132 */
133
Finn Thaine5d55d12016-03-23 21:10:16 +1100134#ifndef NCR5380_io_delay
135#define NCR5380_io_delay(x)
136#endif
137
Finn Thain52d3e562016-03-23 21:10:20 +1100138#ifndef NCR5380_acquire_dma_irq
139#define NCR5380_acquire_dma_irq(x) (1)
140#endif
141
142#ifndef NCR5380_release_dma_irq
143#define NCR5380_release_dma_irq(x)
144#endif
145
Finn Thain54d8fe42016-01-03 16:05:06 +1100146static int do_abort(struct Scsi_Host *);
147static void do_reset(struct Scsi_Host *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Finn Thainc16df322016-01-03 16:06:08 +1100149/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100150 * initialize_SCp - init the scsi pointer field
Finn Thain594d4ba2016-01-03 16:06:10 +1100151 * @cmd: command block to set up
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100153 * Set up the internal fields in the SCSI command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 */
155
Finn Thain710ddd02014-11-12 16:12:02 +1100156static inline void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157{
Finn Thainaff0cf92016-01-03 16:06:09 +1100158 /*
159 * Initialize the Scsi Pointer field so that all of the commands in the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 * various queues are valid.
161 */
162
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200163 if (scsi_bufflen(cmd)) {
164 cmd->SCp.buffer = scsi_sglist(cmd);
165 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Jens Axboe45711f12007-10-22 21:19:53 +0200166 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 cmd->SCp.this_residual = cmd->SCp.buffer->length;
168 } else {
169 cmd->SCp.buffer = NULL;
170 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200171 cmd->SCp.ptr = NULL;
172 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 }
Finn Thainf27db8e2016-01-03 16:06:00 +1100174
175 cmd->SCp.Status = 0;
176 cmd->SCp.Message = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
179/**
Finn Thainb32ade12016-01-03 16:05:41 +1100180 * NCR5380_poll_politely2 - wait for two chip register values
Finn Thain2f854b82016-01-03 16:05:22 +1100181 * @instance: controller to poll
Finn Thainb32ade12016-01-03 16:05:41 +1100182 * @reg1: 5380 register to poll
183 * @bit1: Bitmask to check
184 * @val1: Expected value
185 * @reg2: Second 5380 register to poll
186 * @bit2: Second bitmask to check
187 * @val2: Second expected value
Finn Thain2f854b82016-01-03 16:05:22 +1100188 * @wait: Time-out in jiffies
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189 *
Finn Thain2f854b82016-01-03 16:05:22 +1100190 * Polls the chip in a reasonably efficient manner waiting for an
191 * event to occur. After a short quick poll we begin to yield the CPU
192 * (if possible). In irq contexts the time-out is arbitrarily limited.
193 * Callers may hold locks as long as they are held in irq mode.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 *
Finn Thainb32ade12016-01-03 16:05:41 +1100195 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
Finn Thainb32ade12016-01-03 16:05:41 +1100198static int NCR5380_poll_politely2(struct Scsi_Host *instance,
199 int reg1, int bit1, int val1,
200 int reg2, int bit2, int val2, int wait)
Finn Thain2f854b82016-01-03 16:05:22 +1100201{
202 struct NCR5380_hostdata *hostdata = shost_priv(instance);
203 unsigned long deadline = jiffies + wait;
204 unsigned long n;
205
206 /* Busy-wait for up to 10 ms */
207 n = min(10000U, jiffies_to_usecs(wait));
208 n *= hostdata->accesses_per_ms;
Finn Thainb32ade12016-01-03 16:05:41 +1100209 n /= 2000;
Finn Thain2f854b82016-01-03 16:05:22 +1100210 do {
Finn Thainb32ade12016-01-03 16:05:41 +1100211 if ((NCR5380_read(reg1) & bit1) == val1)
212 return 0;
213 if ((NCR5380_read(reg2) & bit2) == val2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 return 0;
215 cpu_relax();
Finn Thain2f854b82016-01-03 16:05:22 +1100216 } while (n--);
217
218 if (irqs_disabled() || in_interrupt())
219 return -ETIMEDOUT;
220
221 /* Repeatedly sleep for 1 ms until deadline */
222 while (time_is_after_jiffies(deadline)) {
223 schedule_timeout_uninterruptible(1);
Finn Thainb32ade12016-01-03 16:05:41 +1100224 if ((NCR5380_read(reg1) & bit1) == val1)
225 return 0;
226 if ((NCR5380_read(reg2) & bit2) == val2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 }
Finn Thain2f854b82016-01-03 16:05:22 +1100229
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230 return -ETIMEDOUT;
231}
232
Finn Thainb32ade12016-01-03 16:05:41 +1100233static inline int NCR5380_poll_politely(struct Scsi_Host *instance,
234 int reg, int bit, int val, int wait)
235{
236 return NCR5380_poll_politely2(instance, reg, bit, val,
237 reg, bit, val, wait);
238}
239
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +0100240#if NDEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241static struct {
242 unsigned char mask;
243 const char *name;
Finn Thainaff0cf92016-01-03 16:06:09 +1100244} signals[] = {
245 {SR_DBP, "PARITY"},
246 {SR_RST, "RST"},
247 {SR_BSY, "BSY"},
248 {SR_REQ, "REQ"},
249 {SR_MSG, "MSG"},
250 {SR_CD, "CD"},
251 {SR_IO, "IO"},
252 {SR_SEL, "SEL"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100254},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255basrs[] = {
Finn Thain12866b92016-03-23 21:10:25 +1100256 {BASR_END_DMA_TRANSFER, "END OF DMA"},
257 {BASR_DRQ, "DRQ"},
258 {BASR_PARITY_ERROR, "PARITY ERROR"},
259 {BASR_IRQ, "IRQ"},
260 {BASR_PHASE_MATCH, "PHASE MATCH"},
261 {BASR_BUSY_ERROR, "BUSY ERROR"},
Finn Thainaff0cf92016-01-03 16:06:09 +1100262 {BASR_ATN, "ATN"},
263 {BASR_ACK, "ACK"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100265},
266icrs[] = {
267 {ICR_ASSERT_RST, "ASSERT RST"},
Finn Thain12866b92016-03-23 21:10:25 +1100268 {ICR_ARBITRATION_PROGRESS, "ARB. IN PROGRESS"},
269 {ICR_ARBITRATION_LOST, "LOST ARB."},
Finn Thainaff0cf92016-01-03 16:06:09 +1100270 {ICR_ASSERT_ACK, "ASSERT ACK"},
271 {ICR_ASSERT_BSY, "ASSERT BSY"},
272 {ICR_ASSERT_SEL, "ASSERT SEL"},
273 {ICR_ASSERT_ATN, "ASSERT ATN"},
274 {ICR_ASSERT_DATA, "ASSERT DATA"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100276},
277mrs[] = {
Finn Thain12866b92016-03-23 21:10:25 +1100278 {MR_BLOCK_DMA_MODE, "BLOCK DMA MODE"},
279 {MR_TARGET, "TARGET"},
280 {MR_ENABLE_PAR_CHECK, "PARITY CHECK"},
281 {MR_ENABLE_PAR_INTR, "PARITY INTR"},
282 {MR_ENABLE_EOP_INTR, "EOP INTR"},
283 {MR_MONITOR_BSY, "MONITOR BSY"},
284 {MR_DMA_MODE, "DMA MODE"},
285 {MR_ARBITRATE, "ARBITRATE"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 {0, NULL}
287};
288
289/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100290 * NCR5380_print - print scsi bus signals
291 * @instance: adapter state to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100293 * Print the SCSI bus signals for debugging purposes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 */
295
296static void NCR5380_print(struct Scsi_Host *instance)
297{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 unsigned char status, data, basr, mr, icr, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
301 status = NCR5380_read(STATUS_REG);
302 mr = NCR5380_read(MODE_REG);
303 icr = NCR5380_read(INITIATOR_COMMAND_REG);
304 basr = NCR5380_read(BUS_AND_STATUS_REG);
305
Finn Thain12866b92016-03-23 21:10:25 +1100306 printk(KERN_DEBUG "SR = 0x%02x : ", status);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 for (i = 0; signals[i].mask; ++i)
308 if (status & signals[i].mask)
Finn Thain12866b92016-03-23 21:10:25 +1100309 printk(KERN_CONT "%s, ", signals[i].name);
310 printk(KERN_CONT "\nBASR = 0x%02x : ", basr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 for (i = 0; basrs[i].mask; ++i)
312 if (basr & basrs[i].mask)
Finn Thain12866b92016-03-23 21:10:25 +1100313 printk(KERN_CONT "%s, ", basrs[i].name);
314 printk(KERN_CONT "\nICR = 0x%02x : ", icr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 for (i = 0; icrs[i].mask; ++i)
316 if (icr & icrs[i].mask)
Finn Thain12866b92016-03-23 21:10:25 +1100317 printk(KERN_CONT "%s, ", icrs[i].name);
318 printk(KERN_CONT "\nMR = 0x%02x : ", mr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 for (i = 0; mrs[i].mask; ++i)
320 if (mr & mrs[i].mask)
Finn Thain12866b92016-03-23 21:10:25 +1100321 printk(KERN_CONT "%s, ", mrs[i].name);
322 printk(KERN_CONT "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
Finn Thain0d2cf862016-01-03 16:06:11 +1100325static struct {
326 unsigned char value;
327 const char *name;
328} phases[] = {
329 {PHASE_DATAOUT, "DATAOUT"},
330 {PHASE_DATAIN, "DATAIN"},
331 {PHASE_CMDOUT, "CMDOUT"},
332 {PHASE_STATIN, "STATIN"},
333 {PHASE_MSGOUT, "MSGOUT"},
334 {PHASE_MSGIN, "MSGIN"},
335 {PHASE_UNKNOWN, "UNKNOWN"}
336};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Finn Thainc16df322016-01-03 16:06:08 +1100338/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100339 * NCR5380_print_phase - show SCSI phase
Finn Thain594d4ba2016-01-03 16:06:10 +1100340 * @instance: adapter to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100342 * Print the current SCSI phase for debugging purposes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 */
344
345static void NCR5380_print_phase(struct Scsi_Host *instance)
346{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 unsigned char status;
348 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 status = NCR5380_read(STATUS_REG);
351 if (!(status & SR_REQ))
Finn Thain6a6ff4a2016-01-03 16:06:04 +1100352 shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 else {
Finn Thain0d2cf862016-01-03 16:06:11 +1100354 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
355 (phases[i].value != (status & PHASE_MASK)); ++i)
356 ;
Finn Thain6a6ff4a2016-01-03 16:06:04 +1100357 shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 }
359}
360#endif
361
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
Finn Thaind5f7e652016-01-03 16:05:03 +1100363static int probe_irq __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364
365/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100366 * probe_intr - helper for IRQ autoprobe
367 * @irq: interrupt number
368 * @dev_id: unused
369 * @regs: unused
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100371 * Set a flag to indicate the IRQ in question was received. This is
372 * used by the IRQ probe code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 */
Finn Thainaff0cf92016-01-03 16:06:09 +1100374
David Howells7d12e782006-10-05 14:55:46 +0100375static irqreturn_t __init probe_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
377 probe_irq = irq;
378 return IRQ_HANDLED;
379}
380
381/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100382 * NCR5380_probe_irq - find the IRQ of an NCR5380
383 * @instance: NCR5380 controller
384 * @possible: bitmask of ISA IRQ lines
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100386 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
387 * and then looking to see what interrupt actually turned up.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 */
389
Andrew Morton702809c2007-05-23 14:41:56 -0700390static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
391 int possible)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
Finn Thaine8a60142016-01-03 16:05:54 +1100393 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 unsigned long timeout;
395 int trying_irqs, i, mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396
Finn Thain22f5f102014-11-12 16:11:56 +1100397 for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
Michael Opdenacker4909cc22014-03-05 06:09:41 +0100398 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 trying_irqs |= mask;
400
Nicholas Mc Guire4e5a8002015-02-04 13:30:20 -0500401 timeout = jiffies + msecs_to_jiffies(250);
Finn Thain22f5f102014-11-12 16:11:56 +1100402 probe_irq = NO_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403
404 /*
405 * A interrupt is triggered whenever BSY = false, SEL = true
Finn Thainaff0cf92016-01-03 16:06:09 +1100406 * and a bit set in the SELECT_ENABLE_REG is asserted on the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 * SCSI bus.
408 *
409 * Note that the bus is only driven when the phase control signals
410 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
411 * to zero.
412 */
413
414 NCR5380_write(TARGET_COMMAND_REG, 0);
415 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
416 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
417 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
418
Finn Thain22f5f102014-11-12 16:11:56 +1100419 while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
Nishanth Aravamudana9a30472005-11-07 01:01:20 -0800420 schedule_timeout_uninterruptible(1);
Finn Thainaff0cf92016-01-03 16:06:09 +1100421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 NCR5380_write(SELECT_ENABLE_REG, 0);
423 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
424
Finn Thain22f5f102014-11-12 16:11:56 +1100425 for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 if (trying_irqs & mask)
427 free_irq(i, NULL);
428
429 return probe_irq;
430}
431
432/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100433 * NCR58380_info - report driver and host information
434 * @instance: relevant scsi host instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700435 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100436 * For use as the host template info() handler.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 */
438
Finn Thain8c325132014-11-12 16:11:58 +1100439static const char *NCR5380_info(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440{
Finn Thain8c325132014-11-12 16:11:58 +1100441 struct NCR5380_hostdata *hostdata = shost_priv(instance);
442
443 return hostdata->info;
444}
445
446static void prepare_info(struct Scsi_Host *instance)
447{
448 struct NCR5380_hostdata *hostdata = shost_priv(instance);
449
450 snprintf(hostdata->info, sizeof(hostdata->info),
451 "%s, io_port 0x%lx, n_io_port %d, "
452 "base 0x%lx, irq %d, "
453 "can_queue %d, cmd_per_lun %d, "
454 "sg_tablesize %d, this_id %d, "
Finn Thainbe3f4122016-01-03 16:05:50 +1100455 "flags { %s%s%s}, "
Finn Thain8c325132014-11-12 16:11:58 +1100456 "options { %s} ",
457 instance->hostt->name, instance->io_port, instance->n_io_port,
458 instance->base, instance->irq,
459 instance->can_queue, instance->cmd_per_lun,
460 instance->sg_tablesize, instance->this_id,
Finn Thain1bb46002016-03-23 21:10:14 +1100461 hostdata->flags & FLAG_DMA_FIXUP ? "DMA_FIXUP " : "",
Finn Thain8c325132014-11-12 16:11:58 +1100462 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
Finn Thain9c3f0e22016-01-03 16:05:11 +1100463 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464#ifdef DIFFERENTIAL
Finn Thain8c325132014-11-12 16:11:58 +1100465 "DIFFERENTIAL "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467#ifdef PARITY
Finn Thain8c325132014-11-12 16:11:58 +1100468 "PARITY "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469#endif
Finn Thain8c325132014-11-12 16:11:58 +1100470 "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471}
472
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100474 * NCR5380_init - initialise an NCR5380
Finn Thain594d4ba2016-01-03 16:06:10 +1100475 * @instance: adapter to configure
476 * @flags: control flags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100478 * Initializes *instance and corresponding 5380 chip,
479 * with flags OR'd into the initial flags value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100481 * Notes : I assume that the host, hostno, and id bits have been
Finn Thain0d2cf862016-01-03 16:06:11 +1100482 * set correctly. I don't care about the irq and other fields.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100484 * Returns 0 for success
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 */
486
Greg Kroah-Hartman6f039792012-12-21 13:08:55 -0800487static int NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488{
Finn Thaine8a60142016-01-03 16:05:54 +1100489 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thainb6488f92016-01-03 16:05:08 +1100490 int i;
Finn Thain2f854b82016-01-03 16:05:22 +1100491 unsigned long deadline;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492
Finn Thainae5e33a2016-03-23 21:10:23 +1100493 instance->max_lun = 7;
494
Finn Thain0d2cf862016-01-03 16:06:11 +1100495 hostdata->host = instance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 hostdata->id_mask = 1 << instance->this_id;
Finn Thain0d2cf862016-01-03 16:06:11 +1100497 hostdata->id_higher_mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
499 if (i > hostdata->id_mask)
500 hostdata->id_higher_mask |= i;
501 for (i = 0; i < 8; ++i)
502 hostdata->busy[i] = 0;
Finn Thaine4dec682016-03-23 21:10:12 +1100503 hostdata->dma_len = 0;
504
Finn Thain11d2f632016-01-03 16:05:51 +1100505 spin_lock_init(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 hostdata->connected = NULL;
Finn Thainf27db8e2016-01-03 16:06:00 +1100507 hostdata->sensing = NULL;
508 INIT_LIST_HEAD(&hostdata->autosense);
Finn Thain32b26a12016-01-03 16:05:58 +1100509 INIT_LIST_HEAD(&hostdata->unissued);
510 INIT_LIST_HEAD(&hostdata->disconnected);
511
Finn Thain55181be2016-01-03 16:05:42 +1100512 hostdata->flags = flags;
Finn Thainaff0cf92016-01-03 16:06:09 +1100513
Finn Thain8d8601a2016-01-03 16:05:37 +1100514 INIT_WORK(&hostdata->main_task, NCR5380_main);
Finn Thain0ad0eff2016-01-03 16:05:21 +1100515 hostdata->work_q = alloc_workqueue("ncr5380_%d",
516 WQ_UNBOUND | WQ_MEM_RECLAIM,
517 1, instance->host_no);
518 if (!hostdata->work_q)
519 return -ENOMEM;
520
Finn Thain8c325132014-11-12 16:11:58 +1100521 prepare_info(instance);
522
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
524 NCR5380_write(MODE_REG, MR_BASE);
525 NCR5380_write(TARGET_COMMAND_REG, 0);
526 NCR5380_write(SELECT_ENABLE_REG, 0);
Finn Thain2f854b82016-01-03 16:05:22 +1100527
528 /* Calibrate register polling loop */
529 i = 0;
530 deadline = jiffies + 1;
531 do {
532 cpu_relax();
533 } while (time_is_after_jiffies(deadline));
534 deadline += msecs_to_jiffies(256);
535 do {
536 NCR5380_read(STATUS_REG);
537 ++i;
538 cpu_relax();
539 } while (time_is_after_jiffies(deadline));
540 hostdata->accesses_per_ms = i / 256;
541
Finn Thainb6488f92016-01-03 16:05:08 +1100542 return 0;
543}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
Finn Thainb6488f92016-01-03 16:05:08 +1100545/**
546 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
547 * @instance: adapter to check
548 *
549 * If the system crashed, it may have crashed with a connected target and
550 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
551 * currently established nexus, which we know nothing about. Failing that
552 * do a bus reset.
553 *
554 * Note that a bus reset will cause the chip to assert IRQ.
555 *
556 * Returns 0 if successful, otherwise -ENXIO.
557 */
558
559static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
560{
Finn Thain9c3f0e22016-01-03 16:05:11 +1100561 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thainb6488f92016-01-03 16:05:08 +1100562 int pass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563
564 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
565 switch (pass) {
566 case 1:
567 case 3:
568 case 5:
Finn Thain636b1ec2016-01-03 16:05:10 +1100569 shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n");
570 NCR5380_poll_politely(instance,
571 STATUS_REG, SR_BSY, 0, 5 * HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 break;
573 case 2:
Finn Thain636b1ec2016-01-03 16:05:10 +1100574 shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 do_abort(instance);
576 break;
577 case 4:
Finn Thain636b1ec2016-01-03 16:05:10 +1100578 shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 do_reset(instance);
Finn Thain9c3f0e22016-01-03 16:05:11 +1100580 /* Wait after a reset; the SCSI standard calls for
581 * 250ms, we wait 500ms to be on the safe side.
582 * But some Toshiba CD-ROMs need ten times that.
583 */
584 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
585 msleep(2500);
586 else
587 msleep(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 break;
589 case 6:
Finn Thain636b1ec2016-01-03 16:05:10 +1100590 shost_printk(KERN_ERR, instance, "bus locked solid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 return -ENXIO;
592 }
593 }
594 return 0;
595}
596
597/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100598 * NCR5380_exit - remove an NCR5380
Finn Thain594d4ba2016-01-03 16:06:10 +1100599 * @instance: adapter to remove
Finn Thain0d2cf862016-01-03 16:06:11 +1100600 *
601 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 */
603
Randy Dunlapa43cf0f2008-01-22 21:39:33 -0800604static void NCR5380_exit(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605{
Finn Thaine8a60142016-01-03 16:05:54 +1100606 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607
Finn Thain8d8601a2016-01-03 16:05:37 +1100608 cancel_work_sync(&hostdata->main_task);
Finn Thain0ad0eff2016-01-03 16:05:21 +1100609 destroy_workqueue(hostdata->work_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610}
611
612/**
Finn Thain677e0192016-01-03 16:05:59 +1100613 * complete_cmd - finish processing a command and return it to the SCSI ML
614 * @instance: the host instance
615 * @cmd: command to complete
616 */
617
618static void complete_cmd(struct Scsi_Host *instance,
619 struct scsi_cmnd *cmd)
620{
621 struct NCR5380_hostdata *hostdata = shost_priv(instance);
622
623 dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd);
624
Finn Thainf27db8e2016-01-03 16:06:00 +1100625 if (hostdata->sensing == cmd) {
626 /* Autosense processing ends here */
627 if ((cmd->result & 0xff) != SAM_STAT_GOOD) {
628 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
629 set_host_byte(cmd, DID_ERROR);
630 } else
631 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
632 hostdata->sensing = NULL;
633 }
634
Finn Thain677e0192016-01-03 16:05:59 +1100635 hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun);
636
637 cmd->scsi_done(cmd);
638}
639
640/**
Finn Thain1bb40582016-01-03 16:05:29 +1100641 * NCR5380_queue_command - queue a command
642 * @instance: the relevant SCSI adapter
643 * @cmd: SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 *
Finn Thain1bb40582016-01-03 16:05:29 +1100645 * cmd is added to the per-instance issue queue, with minor
646 * twiddling done to the host specific fields of cmd. If the
647 * main coroutine is not running, it is restarted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 */
649
Finn Thain1bb40582016-01-03 16:05:29 +1100650static int NCR5380_queue_command(struct Scsi_Host *instance,
651 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652{
Finn Thain1bb40582016-01-03 16:05:29 +1100653 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain32b26a12016-01-03 16:05:58 +1100654 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
Finn Thain1bb40582016-01-03 16:05:29 +1100655 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
657#if (NDEBUG & NDEBUG_NO_WRITE)
658 switch (cmd->cmnd[0]) {
659 case WRITE_6:
660 case WRITE_10:
Finn Thaindbb6b352016-01-03 16:05:53 +1100661 shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 cmd->result = (DID_ERROR << 16);
Finn Thain1bb40582016-01-03 16:05:29 +1100663 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664 return 0;
665 }
Finn Thain0d2cf862016-01-03 16:06:11 +1100666#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 cmd->result = 0;
669
Finn Thain52d3e562016-03-23 21:10:20 +1100670 if (!NCR5380_acquire_dma_irq(instance))
671 return SCSI_MLQUEUE_HOST_BUSY;
672
Finn Thain11d2f632016-01-03 16:05:51 +1100673 spin_lock_irqsave(&hostdata->lock, flags);
Finn Thain1bb40582016-01-03 16:05:29 +1100674
Finn Thainaff0cf92016-01-03 16:06:09 +1100675 /*
676 * Insert the cmd into the issue queue. Note that REQUEST SENSE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 * commands are added to the head of the queue since any command will
Finn Thainaff0cf92016-01-03 16:06:09 +1100678 * clear the contingent allegiance condition that exists and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 * sense data is only guaranteed to be valid while the condition exists.
680 */
681
Finn Thain32b26a12016-01-03 16:05:58 +1100682 if (cmd->cmnd[0] == REQUEST_SENSE)
683 list_add(&ncmd->list, &hostdata->unissued);
684 else
685 list_add_tail(&ncmd->list, &hostdata->unissued);
686
Finn Thain11d2f632016-01-03 16:05:51 +1100687 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thain1bb40582016-01-03 16:05:29 +1100688
Finn Thaindbb6b352016-01-03 16:05:53 +1100689 dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n",
690 cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 /* Kick off command processing */
Finn Thain8d8601a2016-01-03 16:05:37 +1100693 queue_work(hostdata->work_q, &hostdata->main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 return 0;
695}
696
Finn Thain52d3e562016-03-23 21:10:20 +1100697static inline void maybe_release_dma_irq(struct Scsi_Host *instance)
698{
699 struct NCR5380_hostdata *hostdata = shost_priv(instance);
700
701 /* Caller does the locking needed to set & test these data atomically */
702 if (list_empty(&hostdata->disconnected) &&
703 list_empty(&hostdata->unissued) &&
704 list_empty(&hostdata->autosense) &&
705 !hostdata->connected &&
706 !hostdata->selecting)
707 NCR5380_release_dma_irq(instance);
708}
709
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710/**
Finn Thainf27db8e2016-01-03 16:06:00 +1100711 * dequeue_next_cmd - dequeue a command for processing
712 * @instance: the scsi host instance
713 *
714 * Priority is given to commands on the autosense queue. These commands
715 * need autosense because of a CHECK CONDITION result.
716 *
717 * Returns a command pointer if a command is found for a target that is
718 * not already busy. Otherwise returns NULL.
719 */
720
721static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance)
722{
723 struct NCR5380_hostdata *hostdata = shost_priv(instance);
724 struct NCR5380_cmd *ncmd;
725 struct scsi_cmnd *cmd;
726
Finn Thain8d5dbec2016-02-23 10:07:09 +1100727 if (hostdata->sensing || list_empty(&hostdata->autosense)) {
Finn Thainf27db8e2016-01-03 16:06:00 +1100728 list_for_each_entry(ncmd, &hostdata->unissued, list) {
729 cmd = NCR5380_to_scmd(ncmd);
730 dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n",
731 cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun);
732
733 if (!(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun))) {
734 list_del(&ncmd->list);
735 dsprintk(NDEBUG_QUEUES, instance,
736 "dequeue: removed %p from issue queue\n", cmd);
737 return cmd;
738 }
739 }
740 } else {
741 /* Autosense processing begins here */
742 ncmd = list_first_entry(&hostdata->autosense,
743 struct NCR5380_cmd, list);
744 list_del(&ncmd->list);
745 cmd = NCR5380_to_scmd(ncmd);
746 dsprintk(NDEBUG_QUEUES, instance,
747 "dequeue: removed %p from autosense queue\n", cmd);
748 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
749 hostdata->sensing = cmd;
750 return cmd;
751 }
752 return NULL;
753}
754
755static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
756{
757 struct NCR5380_hostdata *hostdata = shost_priv(instance);
758 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
759
Finn Thain8d5dbec2016-02-23 10:07:09 +1100760 if (hostdata->sensing == cmd) {
Finn Thainf27db8e2016-01-03 16:06:00 +1100761 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
762 list_add(&ncmd->list, &hostdata->autosense);
763 hostdata->sensing = NULL;
764 } else
765 list_add(&ncmd->list, &hostdata->unissued);
766}
767
768/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100769 * NCR5380_main - NCR state machines
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100771 * NCR5380_main is a coroutine that runs as long as more work can
772 * be done on the NCR5380 host adapters in a system. Both
773 * NCR5380_queue_command() and NCR5380_intr() will try to start it
774 * in case it is not running.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700775 */
776
David Howellsc4028952006-11-22 14:57:56 +0000777static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778{
David Howellsc4028952006-11-22 14:57:56 +0000779 struct NCR5380_hostdata *hostdata =
Finn Thain8d8601a2016-01-03 16:05:37 +1100780 container_of(work, struct NCR5380_hostdata, main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781 struct Scsi_Host *instance = hostdata->host;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 int done;
Finn Thainaff0cf92016-01-03 16:06:09 +1100783
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 done = 1;
Finn Thain11d2f632016-01-03 16:05:51 +1100786
Finn Thain0a4e3612016-01-03 16:06:07 +1100787 spin_lock_irq(&hostdata->lock);
Finn Thainccf6efd2016-02-23 10:07:08 +1100788 while (!hostdata->connected && !hostdata->selecting) {
789 struct scsi_cmnd *cmd = dequeue_next_cmd(instance);
790
791 if (!cmd)
792 break;
Finn Thainf27db8e2016-01-03 16:06:00 +1100793
794 dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd);
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 /*
Finn Thainf27db8e2016-01-03 16:06:00 +1100797 * Attempt to establish an I_T_L nexus here.
798 * On success, instance->hostdata->connected is set.
799 * On failure, we must add the command back to the
800 * issue queue so we can keep trying.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 */
Finn Thainf27db8e2016-01-03 16:06:00 +1100802 /*
803 * REQUEST SENSE commands are issued without tagged
804 * queueing, even on SCSI-II devices because the
805 * contingent allegiance condition exists for the
806 * entire unit.
807 */
Finn Thain32b26a12016-01-03 16:05:58 +1100808
Finn Thainccf6efd2016-02-23 10:07:08 +1100809 if (!NCR5380_select(instance, cmd)) {
Finn Thain707d62b2016-01-03 16:06:02 +1100810 dsprintk(NDEBUG_MAIN, instance, "main: select complete\n");
Finn Thain52d3e562016-03-23 21:10:20 +1100811 maybe_release_dma_irq(instance);
Finn Thainf27db8e2016-01-03 16:06:00 +1100812 } else {
813 dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance,
814 "main: select failed, returning %p to queue\n", cmd);
815 requeue_cmd(instance, cmd);
816 }
817 }
Finn Thaine4dec682016-03-23 21:10:12 +1100818 if (hostdata->connected && !hostdata->dma_len) {
Finn Thainb7465452016-01-03 16:06:05 +1100819 dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 NCR5380_information_transfer(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 done = 0;
Finn Thain1d3db592016-01-03 16:05:24 +1100822 }
Finn Thain0a4e3612016-01-03 16:06:07 +1100823 spin_unlock_irq(&hostdata->lock);
824 if (!done)
825 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827}
828
Finn Thain8053b0e2016-03-23 21:10:19 +1100829/*
830 * NCR5380_dma_complete - finish DMA transfer
831 * @instance: the scsi host instance
832 *
833 * Called by the interrupt handler when DMA finishes or a phase
834 * mismatch occurs (which would end the DMA transfer).
835 */
836
837static void NCR5380_dma_complete(struct Scsi_Host *instance)
838{
839 struct NCR5380_hostdata *hostdata = shost_priv(instance);
840 int transferred;
841 unsigned char **data;
842 int *count;
843 int saved_data = 0, overrun = 0;
844 unsigned char p;
845
846 if (hostdata->read_overruns) {
847 p = hostdata->connected->SCp.phase;
848 if (p & SR_IO) {
849 udelay(10);
850 if ((NCR5380_read(BUS_AND_STATUS_REG) &
851 (BASR_PHASE_MATCH | BASR_ACK)) ==
852 (BASR_PHASE_MATCH | BASR_ACK)) {
853 saved_data = NCR5380_read(INPUT_DATA_REG);
854 overrun = 1;
855 dsprintk(NDEBUG_DMA, instance, "read overrun handled\n");
856 }
857 }
858 }
859
Finn Thaine9db3192016-03-23 21:10:21 +1100860#ifdef CONFIG_SUN3
861 if ((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) {
862 pr_err("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n",
863 instance->host_no);
864 BUG();
865 }
866
867 if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) ==
868 (BASR_PHASE_MATCH | BASR_ACK)) {
869 pr_err("scsi%d: BASR %02x\n", instance->host_no,
870 NCR5380_read(BUS_AND_STATUS_REG));
871 pr_err("scsi%d: bus stuck in data phase -- probably a single byte overrun!\n",
872 instance->host_no);
873 BUG();
874 }
875#endif
876
Finn Thain8053b0e2016-03-23 21:10:19 +1100877 NCR5380_write(MODE_REG, MR_BASE);
878 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
879 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
880
881 transferred = hostdata->dma_len - NCR5380_dma_residual(instance);
882 hostdata->dma_len = 0;
883
884 data = (unsigned char **)&hostdata->connected->SCp.ptr;
885 count = &hostdata->connected->SCp.this_residual;
886 *data += transferred;
887 *count -= transferred;
888
889 if (hostdata->read_overruns) {
890 int cnt, toPIO;
891
892 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) == p && (p & SR_IO)) {
893 cnt = toPIO = hostdata->read_overruns;
894 if (overrun) {
895 dsprintk(NDEBUG_DMA, instance,
896 "Got an input overrun, using saved byte\n");
897 *(*data)++ = saved_data;
898 (*count)--;
899 cnt--;
900 toPIO--;
901 }
902 if (toPIO > 0) {
903 dsprintk(NDEBUG_DMA, instance,
904 "Doing %d byte PIO to 0x%p\n", cnt, *data);
905 NCR5380_transfer_pio(instance, &p, &cnt, data);
906 *count -= toPIO - cnt;
907 }
908 }
909 }
910}
911
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912/**
Finn Thaincd400822016-01-03 16:05:40 +1100913 * NCR5380_intr - generic NCR5380 irq handler
914 * @irq: interrupt number
915 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 *
Finn Thaincd400822016-01-03 16:05:40 +1100917 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
918 * from the disconnected queue, and restarting NCR5380_main()
919 * as required.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920 *
Finn Thaincd400822016-01-03 16:05:40 +1100921 * The chip can assert IRQ in any of six different conditions. The IRQ flag
922 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
923 * Three of these six conditions are latched in the Bus and Status Register:
924 * - End of DMA (cleared by ending DMA Mode)
925 * - Parity error (cleared by reading RPIR)
926 * - Loss of BSY (cleared by reading RPIR)
927 * Two conditions have flag bits that are not latched:
928 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
929 * - Bus reset (non-maskable)
930 * The remaining condition has no flag bit at all:
931 * - Selection/reselection
932 *
933 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
934 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
935 * claimed that "the design of the [DP8490] interrupt logic ensures
936 * interrupts will not be lost (they can be on the DP5380)."
937 * The L5380/53C80 datasheet from LOGIC Devices has more details.
938 *
939 * Checking for bus reset by reading RST is futile because of interrupt
940 * latency, but a bus reset will reset chip logic. Checking for parity error
941 * is unnecessary because that interrupt is never enabled. A Loss of BSY
942 * condition will clear DMA Mode. We can tell when this occurs because the
943 * the Busy Monitor interrupt is enabled together with DMA Mode.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700944 */
945
Finn Thaina46865d2016-03-23 21:10:27 +1100946static irqreturn_t __maybe_unused NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947{
Jeff Garzikbaa9aac2007-12-13 16:14:14 -0800948 struct Scsi_Host *instance = dev_id;
Finn Thaincd400822016-01-03 16:05:40 +1100949 struct NCR5380_hostdata *hostdata = shost_priv(instance);
950 int handled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 unsigned char basr;
952 unsigned long flags;
953
Finn Thain11d2f632016-01-03 16:05:51 +1100954 spin_lock_irqsave(&hostdata->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
Finn Thaincd400822016-01-03 16:05:40 +1100956 basr = NCR5380_read(BUS_AND_STATUS_REG);
957 if (basr & BASR_IRQ) {
958 unsigned char mr = NCR5380_read(MODE_REG);
959 unsigned char sr = NCR5380_read(STATUS_REG);
960
Finn Thainb7465452016-01-03 16:06:05 +1100961 dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
962 irq, basr, sr, mr);
Finn Thaincd400822016-01-03 16:05:40 +1100963
Finn Thain8053b0e2016-03-23 21:10:19 +1100964 if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) {
965 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
966 * We ack IRQ after clearing Mode Register. Workarounds
967 * for End of DMA errata need to happen in DMA Mode.
968 */
969
970 dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n");
971
972 if (hostdata->connected) {
973 NCR5380_dma_complete(instance);
974 queue_work(hostdata->work_q, &hostdata->main_task);
975 } else {
976 NCR5380_write(MODE_REG, MR_BASE);
977 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
978 }
979 } else if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) &&
Finn Thaincd400822016-01-03 16:05:40 +1100980 (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) {
981 /* Probably reselected */
982 NCR5380_write(SELECT_ENABLE_REG, 0);
983 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
984
Finn Thainb7465452016-01-03 16:06:05 +1100985 dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n");
Finn Thaincd400822016-01-03 16:05:40 +1100986
987 if (!hostdata->connected) {
988 NCR5380_reselect(instance);
989 queue_work(hostdata->work_q, &hostdata->main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 }
Finn Thaincd400822016-01-03 16:05:40 +1100991 if (!hostdata->connected)
992 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
993 } else {
994 /* Probably Bus Reset */
995 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
996
Finn Thainb7465452016-01-03 16:06:05 +1100997 dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n");
Finn Thaine9db3192016-03-23 21:10:21 +1100998#ifdef SUN3_SCSI_VME
999 dregs->csr |= CSR_DMA_ENABLE;
1000#endif
Finn Thaincd400822016-01-03 16:05:40 +11001001 }
1002 handled = 1;
1003 } else {
1004 shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n");
Finn Thaine9db3192016-03-23 21:10:21 +11001005#ifdef SUN3_SCSI_VME
1006 dregs->csr |= CSR_DMA_ENABLE;
1007#endif
Finn Thaincd400822016-01-03 16:05:40 +11001008 }
1009
Finn Thain11d2f632016-01-03 16:05:51 +11001010 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thaincd400822016-01-03 16:05:40 +11001011
1012 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013}
1014
Finn Thainaff0cf92016-01-03 16:06:09 +11001015/*
Finn Thain710ddd02014-11-12 16:12:02 +11001016 * Function : int NCR5380_select(struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +11001017 * struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 *
1019 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Finn Thain594d4ba2016-01-03 16:06:10 +11001020 * including ARBITRATION, SELECTION, and initial message out for
1021 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001023 * Inputs : instance - instantiation of the 5380 driver on which this
Finn Thain594d4ba2016-01-03 16:06:10 +11001024 * target lives, cmd - SCSI command to execute.
Finn Thainaff0cf92016-01-03 16:06:09 +11001025 *
Finn Thain707d62b2016-01-03 16:06:02 +11001026 * Returns cmd if selection failed but should be retried,
1027 * NULL if selection failed and should not be retried, or
1028 * NULL if selection succeeded (hostdata->connected == cmd).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001030 * Side effects :
Finn Thain594d4ba2016-01-03 16:06:10 +11001031 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
1032 * with registers as they should have been on entry - ie
1033 * SELECT_ENABLE will be set appropriately, the NCR5380
1034 * will cease to drive any SCSI bus signals.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001036 * If successful : I_T_L or I_T_L_Q nexus will be established,
1037 * instance->connected will be set to cmd.
1038 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001040 * If failed (no target) : cmd->scsi_done() will be called, and the
1041 * cmd->result host byte set to DID_BAD_TARGET.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 */
Finn Thainaff0cf92016-01-03 16:06:09 +11001043
Finn Thain707d62b2016-01-03 16:06:02 +11001044static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
1045 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046{
Finn Thaine8a60142016-01-03 16:05:54 +11001047 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 unsigned char tmp[3], phase;
1049 unsigned char *data;
1050 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001051 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
Finn Thainb7465452016-01-03 16:06:05 +11001054 dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n",
1055 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056
Finn Thain707d62b2016-01-03 16:06:02 +11001057 /*
1058 * Arbitration and selection phases are slow and involve dropping the
1059 * lock, so we have to watch out for EH. An exception handler may
1060 * change 'selecting' to NULL. This function will then return NULL
1061 * so that the caller will forget about 'cmd'. (During information
1062 * transfer phases, EH may change 'connected' to NULL.)
1063 */
1064 hostdata->selecting = cmd;
1065
Finn Thainaff0cf92016-01-03 16:06:09 +11001066 /*
1067 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 * data bus during SELECTION.
1069 */
1070
1071 NCR5380_write(TARGET_COMMAND_REG, 0);
1072
Finn Thainaff0cf92016-01-03 16:06:09 +11001073 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 * Start arbitration.
1075 */
1076
1077 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1078 NCR5380_write(MODE_REG, MR_ARBITRATE);
1079
Finn Thain55500d92016-01-03 16:05:35 +11001080 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1081 * Bus Free Delay, arbitration will begin.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 */
1083
Finn Thain11d2f632016-01-03 16:05:51 +11001084 spin_unlock_irq(&hostdata->lock);
Finn Thainb32ade12016-01-03 16:05:41 +11001085 err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0,
1086 INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS,
1087 ICR_ARBITRATION_PROGRESS, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11001088 spin_lock_irq(&hostdata->lock);
Finn Thainb32ade12016-01-03 16:05:41 +11001089 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) {
1090 /* Reselection interrupt */
Finn Thain707d62b2016-01-03 16:06:02 +11001091 goto out;
Finn Thainb32ade12016-01-03 16:05:41 +11001092 }
Finn Thainccf6efd2016-02-23 10:07:08 +11001093 if (!hostdata->selecting) {
1094 /* Command was aborted */
1095 NCR5380_write(MODE_REG, MR_BASE);
1096 goto out;
1097 }
Finn Thainb32ade12016-01-03 16:05:41 +11001098 if (err < 0) {
1099 NCR5380_write(MODE_REG, MR_BASE);
1100 shost_printk(KERN_ERR, instance,
1101 "select: arbitration timeout\n");
Finn Thain707d62b2016-01-03 16:06:02 +11001102 goto out;
Finn Thain55500d92016-01-03 16:05:35 +11001103 }
Finn Thain11d2f632016-01-03 16:05:51 +11001104 spin_unlock_irq(&hostdata->lock);
Finn Thain55500d92016-01-03 16:05:35 +11001105
1106 /* The SCSI-2 arbitration delay is 2.4 us */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001107 udelay(3);
1108
1109 /* Check for lost arbitration */
Finn Thain0d2cf862016-01-03 16:06:11 +11001110 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1111 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1112 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 NCR5380_write(MODE_REG, MR_BASE);
Finn Thainb7465452016-01-03 16:06:05 +11001114 dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n");
Finn Thain11d2f632016-01-03 16:05:51 +11001115 spin_lock_irq(&hostdata->lock);
Finn Thain707d62b2016-01-03 16:06:02 +11001116 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117 }
Finn Thaincf13b082016-01-03 16:05:18 +11001118
1119 /* After/during arbitration, BSY should be asserted.
1120 * IBM DPES-31080 Version S31Q works now
1121 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1122 */
1123 NCR5380_write(INITIATOR_COMMAND_REG,
1124 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125
Finn Thainaff0cf92016-01-03 16:06:09 +11001126 /*
1127 * Again, bus clear + bus settle time is 1.2us, however, this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07001128 * a minimum so we'll udelay ceil(1.2)
1129 */
1130
Finn Thain9c3f0e22016-01-03 16:05:11 +11001131 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
1132 udelay(15);
1133 else
1134 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135
Finn Thain11d2f632016-01-03 16:05:51 +11001136 spin_lock_irq(&hostdata->lock);
1137
Finn Thain72064a72016-01-03 16:05:44 +11001138 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1139 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE))
Finn Thain707d62b2016-01-03 16:06:02 +11001140 goto out;
1141
1142 if (!hostdata->selecting) {
1143 NCR5380_write(MODE_REG, MR_BASE);
1144 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1145 goto out;
1146 }
Finn Thain72064a72016-01-03 16:05:44 +11001147
Finn Thainb7465452016-01-03 16:06:05 +11001148 dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149
Finn Thainaff0cf92016-01-03 16:06:09 +11001150 /*
1151 * Now that we have won arbitration, start Selection process, asserting
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 * the host and target ID's on the SCSI bus.
1153 */
1154
Finn Thain3d07d222016-01-03 16:06:13 +11001155 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
Finn Thainaff0cf92016-01-03 16:06:09 +11001157 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001158 * Raise ATN while SEL is true before BSY goes false from arbitration,
1159 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1160 * phase immediately after selection.
1161 */
1162
Finn Thain3d07d222016-01-03 16:06:13 +11001163 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY |
1164 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001165 NCR5380_write(MODE_REG, MR_BASE);
1166
Finn Thainaff0cf92016-01-03 16:06:09 +11001167 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001168 * Reselect interrupts must be turned off prior to the dropping of BSY,
1169 * otherwise we will trigger an interrupt.
1170 */
1171 NCR5380_write(SELECT_ENABLE_REG, 0);
1172
Finn Thain11d2f632016-01-03 16:05:51 +11001173 spin_unlock_irq(&hostdata->lock);
1174
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001176 * The initiator shall then wait at least two deskew delays and release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 * the BSY signal.
1178 */
Finn Thain0d2cf862016-01-03 16:06:11 +11001179 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180
1181 /* Reset BSY */
Finn Thain3d07d222016-01-03 16:06:13 +11001182 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA |
1183 ICR_ASSERT_ATN | ICR_ASSERT_SEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
Finn Thainaff0cf92016-01-03 16:06:09 +11001185 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186 * Something weird happens when we cease to drive BSY - looks
Finn Thainaff0cf92016-01-03 16:06:09 +11001187 * like the board/chip is letting us do another read before the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 * appropriate propagation delay has expired, and we're confusing
1189 * a BSY signal from ourselves as the target's response to SELECTION.
1190 *
1191 * A small delay (the 'C++' frontend breaks the pipeline with an
1192 * unnecessary jump, making it work on my 386-33/Trantor T128, the
Finn Thainaff0cf92016-01-03 16:06:09 +11001193 * tighter 'C' code breaks and requires this) solves the problem -
1194 * the 1 us delay is arbitrary, and only used because this delay will
1195 * be the same on other platforms and since it works here, it should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 * work there.
1197 *
1198 * wingel suggests that this could be due to failing to wait
1199 * one deskew delay.
1200 */
1201
1202 udelay(1);
1203
Finn Thainb7465452016-01-03 16:06:05 +11001204 dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205
Finn Thainaff0cf92016-01-03 16:06:09 +11001206 /*
1207 * The SCSI specification calls for a 250 ms timeout for the actual
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 * selection.
1209 */
1210
Finn Thainae753a32016-01-03 16:05:23 +11001211 err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY,
1212 msecs_to_jiffies(250));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
Finn Thain11d2f632016-01-03 16:05:51 +11001215 spin_lock_irq(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1217 NCR5380_reselect(instance);
Finn Thaincd400822016-01-03 16:05:40 +11001218 if (!hostdata->connected)
1219 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001220 shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n");
Finn Thain707d62b2016-01-03 16:06:02 +11001221 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 }
Finn Thainae753a32016-01-03 16:05:23 +11001223
1224 if (err < 0) {
Finn Thain11d2f632016-01-03 16:05:51 +11001225 spin_lock_irq(&hostdata->lock);
Finn Thainae753a32016-01-03 16:05:23 +11001226 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thainae753a32016-01-03 16:05:23 +11001227 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain707d62b2016-01-03 16:06:02 +11001228 /* Can't touch cmd if it has been reclaimed by the scsi ML */
1229 if (hostdata->selecting) {
1230 cmd->result = DID_BAD_TARGET << 16;
1231 complete_cmd(instance, cmd);
1232 dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n");
1233 cmd = NULL;
1234 }
1235 goto out;
Finn Thainae753a32016-01-03 16:05:23 +11001236 }
1237
Finn Thainaff0cf92016-01-03 16:06:09 +11001238 /*
1239 * No less than two deskew delays after the initiator detects the
1240 * BSY signal is true, it shall release the SEL signal and may
Linus Torvalds1da177e2005-04-16 15:20:36 -07001241 * change the DATA BUS. -wingel
1242 */
1243
1244 udelay(1);
1245
1246 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1247
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001249 * Since we followed the SCSI spec, and raised ATN while SEL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 * was true but before BSY was false during selection, the information
1251 * transfer phase should be a MESSAGE OUT phase so that we can send the
1252 * IDENTIFY message.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 */
1254
1255 /* Wait for start of REQ/ACK handshake */
1256
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11001258 spin_lock_irq(&hostdata->lock);
Finn Thain1cc160e2016-01-03 16:05:32 +11001259 if (err < 0) {
Finn Thain55500d92016-01-03 16:05:35 +11001260 shost_printk(KERN_ERR, instance, "select: REQ timeout\n");
1261 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001262 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain707d62b2016-01-03 16:06:02 +11001263 goto out;
1264 }
1265 if (!hostdata->selecting) {
1266 do_abort(instance);
1267 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 }
1269
Finn Thainb7465452016-01-03 16:06:05 +11001270 dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n",
1271 scmd_id(cmd));
Finn Thain22f5f102014-11-12 16:11:56 +11001272 tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001273
1274 len = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275 data = tmp;
1276 phase = PHASE_MSGOUT;
1277 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001278 dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001279 /* XXX need to handle errors here */
Finn Thain11d2f632016-01-03 16:05:51 +11001280
Linus Torvalds1da177e2005-04-16 15:20:36 -07001281 hostdata->connected = cmd;
Finn Thain3d07d222016-01-03 16:06:13 +11001282 hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283
Finn Thaine9db3192016-03-23 21:10:21 +11001284#ifdef SUN3_SCSI_VME
1285 dregs->csr |= CSR_INTR;
1286#endif
1287
Boaz Harrosh28424d32007-09-10 22:37:45 +03001288 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
Finn Thain707d62b2016-01-03 16:06:02 +11001290 cmd = NULL;
1291
1292out:
1293 if (!hostdata->selecting)
1294 return NULL;
1295 hostdata->selecting = NULL;
1296 return cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297}
1298
Finn Thainaff0cf92016-01-03 16:06:09 +11001299/*
1300 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +11001301 * unsigned char *phase, int *count, unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 *
1303 * Purpose : transfers data in given phase using polled I/O
1304 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001305 * Inputs : instance - instance of driver, *phase - pointer to
Finn Thain594d4ba2016-01-03 16:06:10 +11001306 * what phase is expected, *count - pointer to number of
1307 * bytes to transfer, **data - pointer to data pointer.
Finn Thainaff0cf92016-01-03 16:06:09 +11001308 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 * Returns : -1 when different phase is entered without transferring
Finn Thain0d2cf862016-01-03 16:06:11 +11001310 * maximum number of bytes, 0 if all bytes are transferred or exit
Finn Thain594d4ba2016-01-03 16:06:10 +11001311 * is in same phase.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001313 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 *
1315 * XXX Note : handling for bus free may be useful.
1316 */
1317
1318/*
Finn Thainaff0cf92016-01-03 16:06:09 +11001319 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320 * IS 100% reliable, and for the actual data transfer where speed
1321 * counts, we will always do a pseudo DMA or DMA transfer.
1322 */
1323
Finn Thain0d2cf862016-01-03 16:06:11 +11001324static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1325 unsigned char *phase, int *count,
1326 unsigned char **data)
1327{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 unsigned char p = *phase, tmp;
1329 int c = *count;
1330 unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331
Finn Thainaff0cf92016-01-03 16:06:09 +11001332 /*
1333 * The NCR5380 chip will only drive the SCSI bus when the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001334 * phase specified in the appropriate bits of the TARGET COMMAND
1335 * REGISTER match the STATUS REGISTER
1336 */
1337
Finn Thain0d2cf862016-01-03 16:06:11 +11001338 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 do {
Finn Thainaff0cf92016-01-03 16:06:09 +11001341 /*
1342 * Wait for assertion of REQ, after which the phase bits will be
1343 * valid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 */
1345
Finn Thain686f3992016-01-03 16:05:26 +11001346 if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348
Finn Thainb7465452016-01-03 16:06:05 +11001349 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350
1351 /* Check for phase mismatch */
Finn Thain686f3992016-01-03 16:05:26 +11001352 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) {
Finn Thainb7465452016-01-03 16:06:05 +11001353 dsprintk(NDEBUG_PIO, instance, "phase mismatch\n");
1354 NCR5380_dprint_phase(NDEBUG_PIO, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 break;
1356 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001357
Linus Torvalds1da177e2005-04-16 15:20:36 -07001358 /* Do actual transfer from SCSI bus to / from memory */
1359 if (!(p & SR_IO))
1360 NCR5380_write(OUTPUT_DATA_REG, *d);
1361 else
1362 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1363
1364 ++d;
1365
Finn Thainaff0cf92016-01-03 16:06:09 +11001366 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001367 * The SCSI standard suggests that in MSGOUT phase, the initiator
1368 * should drop ATN on the last byte of the message phase
1369 * after REQ has been asserted for the handshake but before
1370 * the initiator raises ACK.
1371 */
1372
1373 if (!(p & SR_IO)) {
1374 if (!((p & SR_MSG) && c > 1)) {
1375 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1376 NCR5380_dprint(NDEBUG_PIO, instance);
Finn Thain3d07d222016-01-03 16:06:13 +11001377 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1378 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 } else {
Finn Thain3d07d222016-01-03 16:06:13 +11001380 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1381 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 NCR5380_dprint(NDEBUG_PIO, instance);
Finn Thain3d07d222016-01-03 16:06:13 +11001383 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1384 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385 }
1386 } else {
1387 NCR5380_dprint(NDEBUG_PIO, instance);
1388 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1389 }
1390
Finn Thaina2edc4a2016-01-03 16:05:27 +11001391 if (NCR5380_poll_politely(instance,
1392 STATUS_REG, SR_REQ, 0, 5 * HZ) < 0)
1393 break;
1394
Finn Thainb7465452016-01-03 16:06:05 +11001395 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396
1397/*
Finn Thainaff0cf92016-01-03 16:06:09 +11001398 * We have several special cases to consider during REQ/ACK handshaking :
1399 * 1. We were in MSGOUT phase, and we are on the last byte of the
Finn Thain594d4ba2016-01-03 16:06:10 +11001400 * message. ATN must be dropped as ACK is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001402 * 2. We are in a MSGIN phase, and we are on the last byte of the
Finn Thain594d4ba2016-01-03 16:06:10 +11001403 * message. We must exit with ACK asserted, so that the calling
1404 * code may raise ATN before dropping ACK to reject the message.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 *
1406 * 3. ACK and ATN are clear and the target may proceed as normal.
1407 */
1408 if (!(p == PHASE_MSGIN && c == 1)) {
1409 if (p == PHASE_MSGOUT && c > 1)
1410 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1411 else
1412 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1413 }
1414 } while (--c);
1415
Finn Thainb7465452016-01-03 16:06:05 +11001416 dsprintk(NDEBUG_PIO, instance, "residual %d\n", c);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001417
1418 *count = c;
1419 *data = d;
1420 tmp = NCR5380_read(STATUS_REG);
Finn Thaina2edc4a2016-01-03 16:05:27 +11001421 /* The phase read from the bus is valid if either REQ is (already)
1422 * asserted or if ACK hasn't been released yet. The latter applies if
1423 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1424 */
1425 if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 *phase = tmp & PHASE_MASK;
1427 else
1428 *phase = PHASE_UNKNOWN;
1429
1430 if (!c || (*phase == p))
1431 return 0;
1432 else
1433 return -1;
1434}
1435
1436/**
Finn Thain636b1ec2016-01-03 16:05:10 +11001437 * do_reset - issue a reset command
1438 * @instance: adapter to reset
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 *
Finn Thain636b1ec2016-01-03 16:05:10 +11001440 * Issue a reset sequence to the NCR5380 and try and get the bus
1441 * back into sane shape.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001442 *
Finn Thain636b1ec2016-01-03 16:05:10 +11001443 * This clears the reset interrupt flag because there may be no handler for
1444 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1445 * been installed. And when in EH we may have released the ST DMA interrupt.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 */
Finn Thainaff0cf92016-01-03 16:06:09 +11001447
Finn Thain54d8fe42016-01-03 16:05:06 +11001448static void do_reset(struct Scsi_Host *instance)
1449{
Finn Thain636b1ec2016-01-03 16:05:10 +11001450 unsigned long flags;
1451
1452 local_irq_save(flags);
1453 NCR5380_write(TARGET_COMMAND_REG,
1454 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
Finn Thain636b1ec2016-01-03 16:05:10 +11001456 udelay(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain636b1ec2016-01-03 16:05:10 +11001458 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1459 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460}
1461
Finn Thain80d3eb62016-01-03 16:05:34 +11001462/**
1463 * do_abort - abort the currently established nexus by going to
1464 * MESSAGE OUT phase and sending an ABORT message.
1465 * @instance: relevant scsi host instance
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 *
Finn Thain80d3eb62016-01-03 16:05:34 +11001467 * Returns 0 on success, -1 on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 */
1469
Finn Thain54d8fe42016-01-03 16:05:06 +11001470static int do_abort(struct Scsi_Host *instance)
1471{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 unsigned char *msgptr, phase, tmp;
1473 int len;
1474 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
1476 /* Request message out phase */
1477 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1478
Finn Thainaff0cf92016-01-03 16:06:09 +11001479 /*
1480 * Wait for the target to indicate a valid phase by asserting
1481 * REQ. Once this happens, we'll have either a MSGOUT phase
1482 * and can immediately send the ABORT message, or we'll have some
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483 * other phase and will have to source/sink data.
Finn Thainaff0cf92016-01-03 16:06:09 +11001484 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485 * We really don't care what value was on the bus or what value
1486 * the target sees, so we just handshake.
1487 */
1488
Finn Thain80d3eb62016-01-03 16:05:34 +11001489 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ);
Finn Thain1cc160e2016-01-03 16:05:32 +11001490 if (rc < 0)
Finn Thain80d3eb62016-01-03 16:05:34 +11001491 goto timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
Finn Thainf35d3472016-01-03 16:05:33 +11001493 tmp = NCR5380_read(STATUS_REG) & PHASE_MASK;
Finn Thainaff0cf92016-01-03 16:06:09 +11001494
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1496
Finn Thainf35d3472016-01-03 16:05:33 +11001497 if (tmp != PHASE_MSGOUT) {
Finn Thain0d2cf862016-01-03 16:06:11 +11001498 NCR5380_write(INITIATOR_COMMAND_REG,
1499 ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
Finn Thain54d8fe42016-01-03 16:05:06 +11001500 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ);
Finn Thain1cc160e2016-01-03 16:05:32 +11001501 if (rc < 0)
Finn Thain80d3eb62016-01-03 16:05:34 +11001502 goto timeout;
1503 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001505
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506 tmp = ABORT;
1507 msgptr = &tmp;
1508 len = 1;
1509 phase = PHASE_MSGOUT;
Finn Thain54d8fe42016-01-03 16:05:06 +11001510 NCR5380_transfer_pio(instance, &phase, &len, &msgptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511
1512 /*
1513 * If we got here, and the command completed successfully,
1514 * we're about to go into bus free state.
1515 */
1516
1517 return len ? -1 : 0;
Finn Thain80d3eb62016-01-03 16:05:34 +11001518
1519timeout:
1520 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1521 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522}
1523
Finn Thainaff0cf92016-01-03 16:06:09 +11001524/*
1525 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +11001526 * unsigned char *phase, int *count, unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 *
1528 * Purpose : transfers data in given phase using either real
Finn Thain594d4ba2016-01-03 16:06:10 +11001529 * or pseudo DMA.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001531 * Inputs : instance - instance of driver, *phase - pointer to
Finn Thain594d4ba2016-01-03 16:06:10 +11001532 * what phase is expected, *count - pointer to number of
1533 * bytes to transfer, **data - pointer to data pointer.
Finn Thainaff0cf92016-01-03 16:06:09 +11001534 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 * Returns : -1 when different phase is entered without transferring
Finn Thain594d4ba2016-01-03 16:06:10 +11001536 * maximum number of bytes, 0 if all bytes or transferred or exit
1537 * is in same phase.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001539 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 */
1541
1542
Finn Thain0d2cf862016-01-03 16:06:11 +11001543static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1544 unsigned char *phase, int *count,
1545 unsigned char **data)
1546{
1547 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thainf0ea73a2016-03-23 21:10:26 +11001548 int c = *count;
1549 unsigned char p = *phase;
1550 unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001551 unsigned char tmp;
Finn Thain8053b0e2016-03-23 21:10:19 +11001552 int result = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1555 *phase = tmp;
1556 return -1;
1557 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558
Finn Thain8053b0e2016-03-23 21:10:19 +11001559 hostdata->connected->SCp.phase = p;
1560
1561 if (p & SR_IO) {
1562 if (hostdata->read_overruns)
1563 c -= hostdata->read_overruns;
1564 else if (hostdata->flags & FLAG_DMA_FIXUP)
1565 --c;
1566 }
1567
1568 dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n",
1569 (p & SR_IO) ? "receive" : "send", c, d);
1570
Finn Thaine9db3192016-03-23 21:10:21 +11001571#ifdef CONFIG_SUN3
1572 /* send start chain */
1573 sun3scsi_dma_start(c, *data);
1574#endif
1575
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Finn Thain8053b0e2016-03-23 21:10:19 +11001577 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1578 MR_ENABLE_EOP_INTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001579
Finn Thain8053b0e2016-03-23 21:10:19 +11001580 if (!(hostdata->flags & FLAG_LATE_DMA_SETUP)) {
1581 /* On the Medusa, it is a must to initialize the DMA before
1582 * starting the NCR. This is also the cleaner way for the TT.
1583 */
1584 if (p & SR_IO)
1585 result = NCR5380_dma_recv_setup(instance, d, c);
1586 else
1587 result = NCR5380_dma_send_setup(instance, d, c);
1588 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001589
Finn Thainaff0cf92016-01-03 16:06:09 +11001590 /*
Finn Thain594d4ba2016-01-03 16:06:10 +11001591 * On the PAS16 at least I/O recovery delays are not needed here.
1592 * Everyone else seems to want them.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001593 */
1594
1595 if (p & SR_IO) {
Finn Thaine9db3192016-03-23 21:10:21 +11001596 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thaine5d55d12016-03-23 21:10:16 +11001597 NCR5380_io_delay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1599 } else {
Finn Thaine5d55d12016-03-23 21:10:16 +11001600 NCR5380_io_delay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
Finn Thaine5d55d12016-03-23 21:10:16 +11001602 NCR5380_io_delay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 NCR5380_write(START_DMA_SEND_REG, 0);
Finn Thaine5d55d12016-03-23 21:10:16 +11001604 NCR5380_io_delay(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 }
1606
Finn Thaine9db3192016-03-23 21:10:21 +11001607#ifdef CONFIG_SUN3
1608#ifdef SUN3_SCSI_VME
1609 dregs->csr |= CSR_DMA_ENABLE;
1610#endif
1611 sun3_dma_active = 1;
1612#endif
1613
Finn Thain8053b0e2016-03-23 21:10:19 +11001614 if (hostdata->flags & FLAG_LATE_DMA_SETUP) {
1615 /* On the Falcon, the DMA setup must be done after the last
1616 * NCR access, else the DMA setup gets trashed!
1617 */
1618 if (p & SR_IO)
1619 result = NCR5380_dma_recv_setup(instance, d, c);
1620 else
1621 result = NCR5380_dma_send_setup(instance, d, c);
1622 }
1623
1624 /* On failure, NCR5380_dma_xxxx_setup() returns a negative int. */
1625 if (result < 0)
1626 return result;
1627
1628 /* For real DMA, result is the byte count. DMA interrupt is expected. */
1629 if (result > 0) {
1630 hostdata->dma_len = result;
1631 return 0;
1632 }
1633
1634 /* The result is zero iff pseudo DMA send/receive was completed. */
1635 hostdata->dma_len = c;
1636
Linus Torvalds1da177e2005-04-16 15:20:36 -07001637/*
Finn Thaine4dec682016-03-23 21:10:12 +11001638 * A note regarding the DMA errata workarounds for early NMOS silicon.
Finn Thainc16df322016-01-03 16:06:08 +11001639 *
1640 * For DMA sends, we want to wait until the last byte has been
1641 * transferred out over the bus before we turn off DMA mode. Alas, there
1642 * seems to be no terribly good way of doing this on a 5380 under all
1643 * conditions. For non-scatter-gather operations, we can wait until REQ
1644 * and ACK both go false, or until a phase mismatch occurs. Gather-sends
1645 * are nastier, since the device will be expecting more data than we
1646 * are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1647 * could test Last Byte Sent to assure transfer (I imagine this is precisely
1648 * why this signal was added to the newer chips) but on the older 538[01]
1649 * this signal does not exist. The workaround for this lack is a watchdog;
1650 * we bail out of the wait-loop after a modest amount of wait-time if
1651 * the usual exit conditions are not met. Not a terribly clean or
1652 * correct solution :-%
1653 *
1654 * DMA receive is equally tricky due to a nasty characteristic of the NCR5380.
1655 * If the chip is in DMA receive mode, it will respond to a target's
1656 * REQ by latching the SCSI data into the INPUT DATA register and asserting
1657 * ACK, even if it has _already_ been notified by the DMA controller that
1658 * the current DMA transfer has completed! If the NCR5380 is then taken
1659 * out of DMA mode, this already-acknowledged byte is lost. This is
1660 * not a problem for "one DMA transfer per READ command", because
1661 * the situation will never arise... either all of the data is DMA'ed
1662 * properly, or the target switches to MESSAGE IN phase to signal a
1663 * disconnection (either operation bringing the DMA to a clean halt).
1664 * However, in order to handle scatter-receive, we must work around the
Finn Thaine4dec682016-03-23 21:10:12 +11001665 * problem. The chosen fix is to DMA fewer bytes, then check for the
Finn Thainc16df322016-01-03 16:06:08 +11001666 * condition before taking the NCR5380 out of DMA mode. One or two extra
1667 * bytes are transferred via PIO as necessary to fill out the original
1668 * request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 */
1670
Finn Thain8053b0e2016-03-23 21:10:19 +11001671 if (hostdata->flags & FLAG_DMA_FIXUP) {
1672 if (p & SR_IO) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 /*
Finn Thaine4dec682016-03-23 21:10:12 +11001674 * The workaround was to transfer fewer bytes than we
Finn Thainaff0cf92016-01-03 16:06:09 +11001675 * intended to with the pseudo-DMA read function, wait for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 * the chip to latch the last byte, read it, and then disable
1677 * pseudo-DMA mode.
Finn Thainaff0cf92016-01-03 16:06:09 +11001678 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1680 * REQ is deasserted when ACK is asserted, and not reasserted
1681 * until ACK goes false. Since the NCR5380 won't lower ACK
1682 * until DACK is asserted, which won't happen unless we twiddle
Finn Thainaff0cf92016-01-03 16:06:09 +11001683 * the DMA port or we take the NCR5380 out of DMA mode, we
1684 * can guarantee that we won't handshake another extra
Linus Torvalds1da177e2005-04-16 15:20:36 -07001685 * byte.
1686 */
1687
Finn Thain55181be2016-01-03 16:05:42 +11001688 if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG,
1689 BASR_DRQ, BASR_DRQ, HZ) < 0) {
Finn Thain438af512016-03-23 21:10:18 +11001690 result = -1;
Finn Thain55181be2016-01-03 16:05:42 +11001691 shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 }
Finn Thain55181be2016-01-03 16:05:42 +11001693 if (NCR5380_poll_politely(instance, STATUS_REG,
1694 SR_REQ, 0, HZ) < 0) {
Finn Thain438af512016-03-23 21:10:18 +11001695 result = -1;
Finn Thain55181be2016-01-03 16:05:42 +11001696 shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
1697 }
Finn Thain8053b0e2016-03-23 21:10:19 +11001698 d[*count - 1] = NCR5380_read(INPUT_DATA_REG);
1699 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001701 * Wait for the last byte to be sent. If REQ is being asserted for
1702 * the byte we're interested, we'll ACK it and it will go false.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001703 */
Finn Thain55181be2016-01-03 16:05:42 +11001704 if (NCR5380_poll_politely2(instance,
1705 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
1706 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
Finn Thain438af512016-03-23 21:10:18 +11001707 result = -1;
Finn Thain55181be2016-01-03 16:05:42 +11001708 shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 }
1710 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001711 }
Finn Thain8053b0e2016-03-23 21:10:19 +11001712
1713 NCR5380_dma_complete(instance);
Finn Thain438af512016-03-23 21:10:18 +11001714 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001715}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716
1717/*
1718 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1719 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001720 * Purpose : run through the various SCSI phases and do as the target
Finn Thain594d4ba2016-01-03 16:06:10 +11001721 * directs us to. Operates on the currently connected command,
1722 * instance->connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001723 *
1724 * Inputs : instance, instance for which we are doing commands
1725 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001726 * Side effects : SCSI things happen, the disconnected queue will be
Finn Thain594d4ba2016-01-03 16:06:10 +11001727 * modified if a command disconnects, *instance->connected will
1728 * change.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001730 * XXX Note : we need to watch for bus free or a reset condition here
Finn Thain594d4ba2016-01-03 16:06:10 +11001731 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001732 */
1733
Finn Thain0d2cf862016-01-03 16:06:11 +11001734static void NCR5380_information_transfer(struct Scsi_Host *instance)
1735{
Finn Thaine8a60142016-01-03 16:05:54 +11001736 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 unsigned char msgout = NOP;
1738 int sink = 0;
1739 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001740 int transfersize;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741 unsigned char *data;
1742 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
Finn Thain11d2f632016-01-03 16:05:51 +11001743 struct scsi_cmnd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001744
Finn Thaine9db3192016-03-23 21:10:21 +11001745#ifdef SUN3_SCSI_VME
1746 dregs->csr |= CSR_INTR;
1747#endif
1748
Finn Thain11d2f632016-01-03 16:05:51 +11001749 while ((cmd = hostdata->connected)) {
Finn Thain32b26a12016-01-03 16:05:58 +11001750 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
1751
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 tmp = NCR5380_read(STATUS_REG);
1753 /* We only have a valid SCSI phase when REQ is asserted */
1754 if (tmp & SR_REQ) {
1755 phase = (tmp & PHASE_MASK);
1756 if (phase != old_phase) {
1757 old_phase = phase;
1758 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
1759 }
Finn Thaine9db3192016-03-23 21:10:21 +11001760#ifdef CONFIG_SUN3
1761 if (phase == PHASE_CMDOUT) {
1762 void *d;
1763 unsigned long count;
1764
1765 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1766 count = cmd->SCp.buffer->length;
1767 d = sg_virt(cmd->SCp.buffer);
1768 } else {
1769 count = cmd->SCp.this_residual;
1770 d = cmd->SCp.ptr;
1771 }
1772
1773 if (sun3_dma_setup_done != cmd &&
1774 sun3scsi_dma_xfer_len(count, cmd) > 0) {
1775 sun3scsi_dma_setup(instance, d, count,
1776 rq_data_dir(cmd->request));
1777 sun3_dma_setup_done = cmd;
1778 }
1779#ifdef SUN3_SCSI_VME
1780 dregs->csr |= CSR_INTR;
1781#endif
1782 }
1783#endif /* CONFIG_SUN3 */
1784
Linus Torvalds1da177e2005-04-16 15:20:36 -07001785 if (sink && (phase != PHASE_MSGOUT)) {
1786 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1787
Finn Thain3d07d222016-01-03 16:06:13 +11001788 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1789 ICR_ASSERT_ACK);
Finn Thain0d2cf862016-01-03 16:06:11 +11001790 while (NCR5380_read(STATUS_REG) & SR_REQ)
1791 ;
Finn Thain3d07d222016-01-03 16:06:13 +11001792 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1793 ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 sink = 0;
1795 continue;
1796 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001797
Linus Torvalds1da177e2005-04-16 15:20:36 -07001798 switch (phase) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001799 case PHASE_DATAOUT:
1800#if (NDEBUG & NDEBUG_NO_DATAOUT)
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001801 shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001802 sink = 1;
1803 do_abort(instance);
1804 cmd->result = DID_ERROR << 16;
Finn Thain677e0192016-01-03 16:05:59 +11001805 complete_cmd(instance, cmd);
Finn Thaindc183962016-02-23 10:07:07 +11001806 hostdata->connected = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001807 return;
1808#endif
Finn Thainbf1a0c62016-01-03 16:05:47 +11001809 case PHASE_DATAIN:
Finn Thainaff0cf92016-01-03 16:06:09 +11001810 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001811 * If there is no room left in the current buffer in the
1812 * scatter-gather list, move onto the next one.
1813 */
1814
1815 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1816 ++cmd->SCp.buffer;
1817 --cmd->SCp.buffers_residual;
1818 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02001819 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Finn Thainb7465452016-01-03 16:06:05 +11001820 dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n",
1821 cmd->SCp.this_residual,
1822 cmd->SCp.buffers_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001823 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001824
Linus Torvalds1da177e2005-04-16 15:20:36 -07001825 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001826 * The preferred transfer method is going to be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 * PSEUDO-DMA for systems that are strictly PIO,
1828 * since we can let the hardware do the handshaking.
1829 *
1830 * For this to work, we need to know the transfersize
1831 * ahead of time, since the pseudo-DMA code will sit
1832 * in an unconditional loop.
1833 */
1834
Finn Thainff3d4572016-01-03 16:05:25 +11001835 transfersize = 0;
Finn Thain7e9ec8d2016-03-23 21:10:11 +11001836 if (!cmd->device->borken)
Finn Thainff3d4572016-01-03 16:05:25 +11001837 transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001838
Finn Thain438af512016-03-23 21:10:18 +11001839 if (transfersize > 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001840 len = transfersize;
Finn Thain0d2cf862016-01-03 16:06:11 +11001841 if (NCR5380_transfer_dma(instance, &phase,
1842 &len, (unsigned char **)&cmd->SCp.ptr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 /*
Finn Thain0d2cf862016-01-03 16:06:11 +11001844 * If the watchdog timer fires, all future
1845 * accesses to this device will use the
1846 * polled-IO.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 */
Jeff Garzik017560f2005-10-24 18:04:36 -04001848 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11001849 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001850 cmd->device->borken = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 sink = 1;
1852 do_abort(instance);
1853 cmd->result = DID_ERROR << 16;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001854 /* XXX - need to source or sink data here, as appropriate */
Finn Thain8053b0e2016-03-23 21:10:19 +11001855 }
Finn Thainf825e402016-03-23 21:10:15 +11001856 } else {
Finn Thain16788472016-02-23 10:07:05 +11001857 /* Break up transfer into 3 ms chunks,
1858 * presuming 6 accesses per handshake.
1859 */
1860 transfersize = min((unsigned long)cmd->SCp.this_residual,
1861 hostdata->accesses_per_ms / 2);
1862 len = transfersize;
1863 NCR5380_transfer_pio(instance, &phase, &len,
Finn Thain3d07d222016-01-03 16:06:13 +11001864 (unsigned char **)&cmd->SCp.ptr);
Finn Thain16788472016-02-23 10:07:05 +11001865 cmd->SCp.this_residual -= transfersize - len;
Finn Thain11d2f632016-01-03 16:05:51 +11001866 }
Finn Thaine9db3192016-03-23 21:10:21 +11001867#ifdef CONFIG_SUN3
1868 if (sun3_dma_setup_done == cmd)
1869 sun3_dma_setup_done = NULL;
1870#endif
Finn Thain16788472016-02-23 10:07:05 +11001871 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001872 case PHASE_MSGIN:
1873 len = 1;
1874 data = &tmp;
1875 NCR5380_transfer_pio(instance, &phase, &len, &data);
1876 cmd->SCp.Message = tmp;
1877
1878 switch (tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001879 case ABORT:
1880 case COMMAND_COMPLETE:
1881 /* Accept message by clearing ACK */
1882 sink = 1;
1883 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain0d3d9a42016-01-03 16:05:55 +11001884 dsprintk(NDEBUG_QUEUES, instance,
1885 "COMMAND COMPLETE %p target %d lun %llu\n",
1886 cmd, scmd_id(cmd), cmd->device->lun);
1887
Linus Torvalds1da177e2005-04-16 15:20:36 -07001888 hostdata->connected = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
Finn Thainf27db8e2016-01-03 16:06:00 +11001890 cmd->result &= ~0xffff;
1891 cmd->result |= cmd->SCp.Status;
1892 cmd->result |= cmd->SCp.Message << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001893
Finn Thainf27db8e2016-01-03 16:06:00 +11001894 if (cmd->cmnd[0] == REQUEST_SENSE)
Finn Thain677e0192016-01-03 16:05:59 +11001895 complete_cmd(instance, cmd);
Finn Thainf27db8e2016-01-03 16:06:00 +11001896 else {
1897 if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION ||
1898 cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) {
1899 dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n",
1900 cmd);
1901 list_add_tail(&ncmd->list,
1902 &hostdata->autosense);
1903 } else
1904 complete_cmd(instance, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001905 }
1906
Finn Thainaff0cf92016-01-03 16:06:09 +11001907 /*
1908 * Restore phase bits to 0 so an interrupted selection,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001909 * arbitration can resume.
1910 */
1911 NCR5380_write(TARGET_COMMAND_REG, 0);
Finn Thain72064a72016-01-03 16:05:44 +11001912
1913 /* Enable reselect interrupts */
1914 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain52d3e562016-03-23 21:10:20 +11001915
1916 maybe_release_dma_irq(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 return;
1918 case MESSAGE_REJECT:
1919 /* Accept message by clearing ACK */
1920 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1921 switch (hostdata->last_message) {
1922 case HEAD_OF_QUEUE_TAG:
1923 case ORDERED_QUEUE_TAG:
1924 case SIMPLE_QUEUE_TAG:
1925 cmd->device->simple_tags = 0;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001926 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927 break;
1928 default:
1929 break;
1930 }
Finn Thain340b9612016-01-03 16:05:31 +11001931 break;
Finn Thain0d2cf862016-01-03 16:06:11 +11001932 case DISCONNECT:
1933 /* Accept message by clearing ACK */
1934 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1935 hostdata->connected = NULL;
1936 list_add(&ncmd->list, &hostdata->disconnected);
1937 dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES,
1938 instance, "connected command %p for target %d lun %llu moved to disconnected queue\n",
1939 cmd, scmd_id(cmd), cmd->device->lun);
Finn Thain0d3d9a42016-01-03 16:05:55 +11001940
Finn Thain0d2cf862016-01-03 16:06:11 +11001941 /*
1942 * Restore phase bits to 0 so an interrupted selection,
1943 * arbitration can resume.
1944 */
1945 NCR5380_write(TARGET_COMMAND_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946
Finn Thain0d2cf862016-01-03 16:06:11 +11001947 /* Enable reselect interrupts */
1948 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thaine9db3192016-03-23 21:10:21 +11001949#ifdef SUN3_SCSI_VME
1950 dregs->csr |= CSR_DMA_ENABLE;
1951#endif
Finn Thain0d2cf862016-01-03 16:06:11 +11001952 return;
Finn Thainaff0cf92016-01-03 16:06:09 +11001953 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001954 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
Finn Thainaff0cf92016-01-03 16:06:09 +11001955 * operation, in violation of the SCSI spec so we can safely
Linus Torvalds1da177e2005-04-16 15:20:36 -07001956 * ignore SAVE/RESTORE pointers calls.
1957 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001958 * Unfortunately, some disks violate the SCSI spec and
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 * don't issue the required SAVE_POINTERS message before
Finn Thainaff0cf92016-01-03 16:06:09 +11001960 * disconnecting, and we have to break spec to remain
Linus Torvalds1da177e2005-04-16 15:20:36 -07001961 * compatible.
1962 */
1963 case SAVE_POINTERS:
1964 case RESTORE_POINTERS:
1965 /* Accept message by clearing ACK */
1966 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1967 break;
1968 case EXTENDED_MESSAGE:
Finn Thainc16df322016-01-03 16:06:08 +11001969 /*
1970 * Start the message buffer with the EXTENDED_MESSAGE
1971 * byte, since spi_print_msg() wants the whole thing.
1972 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001973 extended_msg[0] = EXTENDED_MESSAGE;
1974 /* Accept first byte by clearing ACK */
1975 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain11d2f632016-01-03 16:05:51 +11001976
1977 spin_unlock_irq(&hostdata->lock);
1978
Finn Thainb7465452016-01-03 16:06:05 +11001979 dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001980
1981 len = 2;
1982 data = extended_msg + 1;
1983 phase = PHASE_MSGIN;
1984 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001985 dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n",
1986 (int)extended_msg[1],
1987 (int)extended_msg[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001988
Finn Thaine0783ed2016-01-03 16:05:45 +11001989 if (!len && extended_msg[1] > 0 &&
1990 extended_msg[1] <= sizeof(extended_msg) - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001991 /* Accept third byte by clearing ACK */
1992 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1993 len = extended_msg[1] - 1;
1994 data = extended_msg + 3;
1995 phase = PHASE_MSGIN;
1996
1997 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001998 dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n",
1999 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002000
2001 switch (extended_msg[2]) {
2002 case EXTENDED_SDTR:
2003 case EXTENDED_WDTR:
2004 case EXTENDED_MODIFY_DATA_POINTER:
2005 case EXTENDED_EXTENDED_IDENTIFY:
2006 tmp = 0;
2007 }
2008 } else if (len) {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002009 shost_printk(KERN_ERR, instance, "error receiving extended message\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002010 tmp = 0;
2011 } else {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002012 shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n",
2013 extended_msg[2], extended_msg[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002014 tmp = 0;
2015 }
Finn Thain11d2f632016-01-03 16:05:51 +11002016
2017 spin_lock_irq(&hostdata->lock);
2018 if (!hostdata->connected)
2019 return;
2020
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 /* Fall through to reject message */
2022
Finn Thainaff0cf92016-01-03 16:06:09 +11002023 /*
2024 * If we get something weird that we aren't expecting,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002025 * reject it.
2026 */
2027 default:
2028 if (!tmp) {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002029 shost_printk(KERN_ERR, instance, "rejecting message ");
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002030 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002031 printk("\n");
2032 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002033 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11002034 "rejecting unknown message %02x\n",
2035 tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002036 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002037 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11002038 "rejecting unknown extended message code %02x, length %d\n",
2039 extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002040
2041 msgout = MESSAGE_REJECT;
2042 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2043 break;
Finn Thain0d2cf862016-01-03 16:06:11 +11002044 } /* switch (tmp) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002045 break;
2046 case PHASE_MSGOUT:
2047 len = 1;
2048 data = &msgout;
2049 hostdata->last_message = msgout;
2050 NCR5380_transfer_pio(instance, &phase, &len, &data);
2051 if (msgout == ABORT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002052 hostdata->connected = NULL;
2053 cmd->result = DID_ERROR << 16;
Finn Thain677e0192016-01-03 16:05:59 +11002054 complete_cmd(instance, cmd);
Finn Thain52d3e562016-03-23 21:10:20 +11002055 maybe_release_dma_irq(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2057 return;
2058 }
2059 msgout = NOP;
2060 break;
2061 case PHASE_CMDOUT:
2062 len = cmd->cmd_len;
2063 data = cmd->cmnd;
Finn Thainaff0cf92016-01-03 16:06:09 +11002064 /*
2065 * XXX for performance reasons, on machines with a
2066 * PSEUDO-DMA architecture we should probably
2067 * use the dma transfer function.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002068 */
2069 NCR5380_transfer_pio(instance, &phase, &len, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070 break;
2071 case PHASE_STATIN:
2072 len = 1;
2073 data = &tmp;
2074 NCR5380_transfer_pio(instance, &phase, &len, &data);
2075 cmd->SCp.Status = tmp;
2076 break;
2077 default:
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002078 shost_printk(KERN_ERR, instance, "unknown phase\n");
Finn Thain4dde8f72014-03-18 11:42:17 +11002079 NCR5380_dprint(NDEBUG_ANY, instance);
Finn Thain0d2cf862016-01-03 16:06:11 +11002080 } /* switch(phase) */
Finn Thain686f3992016-01-03 16:05:26 +11002081 } else {
Finn Thain11d2f632016-01-03 16:05:51 +11002082 spin_unlock_irq(&hostdata->lock);
Finn Thain686f3992016-01-03 16:05:26 +11002083 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11002084 spin_lock_irq(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002085 }
Finn Thain11d2f632016-01-03 16:05:51 +11002086 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002087}
2088
2089/*
2090 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2091 *
Finn Thainaff0cf92016-01-03 16:06:09 +11002092 * Purpose : does reselection, initializing the instance->connected
Finn Thain594d4ba2016-01-03 16:06:10 +11002093 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2094 * nexus has been reestablished,
Finn Thainaff0cf92016-01-03 16:06:09 +11002095 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002096 * Inputs : instance - this instance of the NCR5380.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002097 */
2098
Finn Thain0d2cf862016-01-03 16:06:11 +11002099static void NCR5380_reselect(struct Scsi_Host *instance)
2100{
Finn Thaine8a60142016-01-03 16:05:54 +11002101 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102 unsigned char target_mask;
Finn Thaine9db3192016-03-23 21:10:21 +11002103 unsigned char lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002104 unsigned char msg[3];
Finn Thain32b26a12016-01-03 16:05:58 +11002105 struct NCR5380_cmd *ncmd;
2106 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002107
2108 /*
2109 * Disable arbitration, etc. since the host adapter obviously
2110 * lost, and tell an interrupted NCR5380_select() to restart.
2111 */
2112
2113 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002114
2115 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
Finn Thainb7465452016-01-03 16:06:05 +11002116
2117 dsprintk(NDEBUG_RESELECTION, instance, "reselect\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002118
Finn Thainaff0cf92016-01-03 16:06:09 +11002119 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002120 * At this point, we have detected that our SCSI ID is on the bus,
2121 * SEL is true and BSY was false for at least one bus settle delay
2122 * (400 ns).
2123 *
2124 * We must assert BSY ourselves, until the target drops the SEL
2125 * signal.
2126 */
2127
2128 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
Finn Thain72064a72016-01-03 16:05:44 +11002129 if (NCR5380_poll_politely(instance,
2130 STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) {
2131 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2132 return;
2133 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002134 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2135
2136 /*
2137 * Wait for target to go into MSGIN.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 */
2139
Finn Thain1cc160e2016-01-03 16:05:32 +11002140 if (NCR5380_poll_politely(instance,
Finn Thain72064a72016-01-03 16:05:44 +11002141 STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) {
2142 do_abort(instance);
2143 return;
2144 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145
Finn Thaine9db3192016-03-23 21:10:21 +11002146#ifdef CONFIG_SUN3
2147 /* acknowledge toggle to MSGIN */
2148 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002149
Finn Thaine9db3192016-03-23 21:10:21 +11002150 /* peek at the byte without really hitting the bus */
2151 msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG);
2152#else
2153 {
2154 int len = 1;
2155 unsigned char *data = msg;
2156 unsigned char phase = PHASE_MSGIN;
2157
2158 NCR5380_transfer_pio(instance, &phase, &len, &data);
2159
2160 if (len) {
2161 do_abort(instance);
2162 return;
2163 }
Finn Thain72064a72016-01-03 16:05:44 +11002164 }
Finn Thaine9db3192016-03-23 21:10:21 +11002165#endif /* CONFIG_SUN3 */
Finn Thain72064a72016-01-03 16:05:44 +11002166
Linus Torvalds1da177e2005-04-16 15:20:36 -07002167 if (!(msg[0] & 0x80)) {
Finn Thain72064a72016-01-03 16:05:44 +11002168 shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got ");
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002169 spi_print_msg(msg);
Finn Thain72064a72016-01-03 16:05:44 +11002170 printk("\n");
2171 do_abort(instance);
2172 return;
2173 }
2174 lun = msg[0] & 0x07;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002175
Finn Thain72064a72016-01-03 16:05:44 +11002176 /*
2177 * We need to add code for SCSI-II to track which devices have
2178 * I_T_L_Q nexuses established, and which have simple I_T_L
2179 * nexuses so we can chose to do additional data transfer.
2180 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002181
Finn Thain72064a72016-01-03 16:05:44 +11002182 /*
2183 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2184 * just reestablished, and remove it from the disconnected queue.
2185 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186
Finn Thain32b26a12016-01-03 16:05:58 +11002187 tmp = NULL;
2188 list_for_each_entry(ncmd, &hostdata->disconnected, list) {
2189 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2190
2191 if (target_mask == (1 << scmd_id(cmd)) &&
2192 lun == (u8)cmd->device->lun) {
2193 list_del(&ncmd->list);
2194 tmp = cmd;
Finn Thain72064a72016-01-03 16:05:44 +11002195 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196 }
2197 }
Finn Thain0d3d9a42016-01-03 16:05:55 +11002198
2199 if (tmp) {
2200 dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance,
2201 "reselect: removed %p from disconnected queue\n", tmp);
2202 } else {
Finn Thain72064a72016-01-03 16:05:44 +11002203 shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2204 target_mask, lun);
2205 /*
Finn Thain0d2cf862016-01-03 16:06:11 +11002206 * Since we have an established nexus that we can't do anything
2207 * with, we must abort it.
Finn Thain72064a72016-01-03 16:05:44 +11002208 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002209 do_abort(instance);
Finn Thain72064a72016-01-03 16:05:44 +11002210 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002211 }
Finn Thain72064a72016-01-03 16:05:44 +11002212
Finn Thaine9db3192016-03-23 21:10:21 +11002213#ifdef CONFIG_SUN3
2214 {
2215 void *d;
2216 unsigned long count;
2217
2218 if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) {
2219 count = tmp->SCp.buffer->length;
2220 d = sg_virt(tmp->SCp.buffer);
2221 } else {
2222 count = tmp->SCp.this_residual;
2223 d = tmp->SCp.ptr;
2224 }
2225
2226 if (sun3_dma_setup_done != tmp &&
2227 sun3scsi_dma_xfer_len(count, tmp) > 0) {
2228 sun3scsi_dma_setup(instance, d, count,
2229 rq_data_dir(tmp->request));
2230 sun3_dma_setup_done = tmp;
2231 }
2232 }
2233
2234 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
2235#endif /* CONFIG_SUN3 */
2236
Finn Thain72064a72016-01-03 16:05:44 +11002237 /* Accept message by clearing ACK */
2238 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2239
2240 hostdata->connected = tmp;
Finn Thainc4ec6f92016-03-23 21:10:22 +11002241 dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu\n",
2242 scmd_id(tmp), tmp->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243}
2244
Finn Thain8b00c3d2016-01-03 16:06:01 +11002245/**
2246 * list_find_cmd - test for presence of a command in a linked list
2247 * @haystack: list of commands
2248 * @needle: command to search for
2249 */
2250
2251static bool list_find_cmd(struct list_head *haystack,
2252 struct scsi_cmnd *needle)
2253{
2254 struct NCR5380_cmd *ncmd;
2255
2256 list_for_each_entry(ncmd, haystack, list)
2257 if (NCR5380_to_scmd(ncmd) == needle)
2258 return true;
2259 return false;
2260}
2261
2262/**
2263 * list_remove_cmd - remove a command from linked list
2264 * @haystack: list of commands
2265 * @needle: command to remove
2266 */
2267
2268static bool list_del_cmd(struct list_head *haystack,
2269 struct scsi_cmnd *needle)
2270{
2271 if (list_find_cmd(haystack, needle)) {
2272 struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle);
2273
2274 list_del(&ncmd->list);
2275 return true;
2276 }
2277 return false;
2278}
2279
2280/**
2281 * NCR5380_abort - scsi host eh_abort_handler() method
2282 * @cmd: the command to be aborted
Linus Torvalds1da177e2005-04-16 15:20:36 -07002283 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002284 * Try to abort a given command by removing it from queues and/or sending
2285 * the target an abort message. This may not succeed in causing a target
2286 * to abort the command. Nonetheless, the low-level driver must forget about
2287 * the command because the mid-layer reclaims it and it may be re-issued.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002288 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002289 * The normal path taken by a command is as follows. For EH we trace this
2290 * same path to locate and abort the command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002291 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002292 * unissued -> selecting -> [unissued -> selecting ->]... connected ->
2293 * [disconnected -> connected ->]...
2294 * [autosense -> connected ->] done
Linus Torvalds1da177e2005-04-16 15:20:36 -07002295 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002296 * If cmd was not found at all then presumably it has already been completed,
2297 * in which case return SUCCESS to try to avoid further EH measures.
Finn Thaindc183962016-02-23 10:07:07 +11002298 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002299 * If the command has not completed yet, we must not fail to find it.
Finn Thaindc183962016-02-23 10:07:07 +11002300 * We have no option but to forget the aborted command (even if it still
2301 * lacks sense data). The mid-layer may re-issue a command that is in error
2302 * recovery (see scsi_send_eh_cmnd), but the logic and data structures in
2303 * this driver are such that a command can appear on one queue only.
Finn Thain71a00592016-02-23 10:07:06 +11002304 *
2305 * The lock protects driver data structures, but EH handlers also use it
2306 * to serialize their own execution and prevent their own re-entry.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 */
2308
Finn Thain710ddd02014-11-12 16:12:02 +11002309static int NCR5380_abort(struct scsi_cmnd *cmd)
2310{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002311 struct Scsi_Host *instance = cmd->device->host;
Finn Thaine8a60142016-01-03 16:05:54 +11002312 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain11d2f632016-01-03 16:05:51 +11002313 unsigned long flags;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002314 int result = SUCCESS;
Hannes Reinecke1fa6b5f2014-10-24 14:26:58 +02002315
Finn Thain11d2f632016-01-03 16:05:51 +11002316 spin_lock_irqsave(&hostdata->lock, flags);
2317
Finn Thain32b26a12016-01-03 16:05:58 +11002318#if (NDEBUG & NDEBUG_ANY)
Finn Thain8b00c3d2016-01-03 16:06:01 +11002319 scmd_printk(KERN_INFO, cmd, __func__);
Finn Thain32b26a12016-01-03 16:05:58 +11002320#endif
Finn Thaine5c3fdd2016-01-03 16:05:52 +11002321 NCR5380_dprint(NDEBUG_ANY, instance);
2322 NCR5380_dprint_phase(NDEBUG_ANY, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002323
Finn Thain8b00c3d2016-01-03 16:06:01 +11002324 if (list_del_cmd(&hostdata->unissued, cmd)) {
2325 dsprintk(NDEBUG_ABORT, instance,
2326 "abort: removed %p from issue queue\n", cmd);
2327 cmd->result = DID_ABORT << 16;
2328 cmd->scsi_done(cmd); /* No tag or busy flag to worry about */
Finn Thaindc183962016-02-23 10:07:07 +11002329 goto out;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002330 }
2331
Finn Thain707d62b2016-01-03 16:06:02 +11002332 if (hostdata->selecting == cmd) {
2333 dsprintk(NDEBUG_ABORT, instance,
2334 "abort: cmd %p == selecting\n", cmd);
2335 hostdata->selecting = NULL;
2336 cmd->result = DID_ABORT << 16;
2337 complete_cmd(instance, cmd);
2338 goto out;
2339 }
2340
Finn Thain8b00c3d2016-01-03 16:06:01 +11002341 if (list_del_cmd(&hostdata->disconnected, cmd)) {
2342 dsprintk(NDEBUG_ABORT, instance,
2343 "abort: removed %p from disconnected list\n", cmd);
Finn Thain71a00592016-02-23 10:07:06 +11002344 /* Can't call NCR5380_select() and send ABORT because that
2345 * means releasing the lock. Need a bus reset.
2346 */
Finn Thaindc183962016-02-23 10:07:07 +11002347 set_host_byte(cmd, DID_ERROR);
2348 complete_cmd(instance, cmd);
Finn Thain71a00592016-02-23 10:07:06 +11002349 result = FAILED;
2350 goto out;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002351 }
2352
2353 if (hostdata->connected == cmd) {
2354 dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
2355 hostdata->connected = NULL;
Finn Thaindc183962016-02-23 10:07:07 +11002356 hostdata->dma_len = 0;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002357 if (do_abort(instance)) {
2358 set_host_byte(cmd, DID_ERROR);
2359 complete_cmd(instance, cmd);
2360 result = FAILED;
2361 goto out;
2362 }
2363 set_host_byte(cmd, DID_ABORT);
Finn Thaindc183962016-02-23 10:07:07 +11002364 complete_cmd(instance, cmd);
2365 goto out;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002366 }
2367
Finn Thaindc183962016-02-23 10:07:07 +11002368 if (list_del_cmd(&hostdata->autosense, cmd)) {
Finn Thain8b00c3d2016-01-03 16:06:01 +11002369 dsprintk(NDEBUG_ABORT, instance,
Finn Thaindc183962016-02-23 10:07:07 +11002370 "abort: removed %p from sense queue\n", cmd);
2371 set_host_byte(cmd, DID_ERROR);
Finn Thain8b00c3d2016-01-03 16:06:01 +11002372 complete_cmd(instance, cmd);
2373 }
2374
2375out:
2376 if (result == FAILED)
2377 dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd);
2378 else
2379 dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd);
2380
2381 queue_work(hostdata->work_q, &hostdata->main_task);
Finn Thain52d3e562016-03-23 21:10:20 +11002382 maybe_release_dma_irq(instance);
Finn Thain11d2f632016-01-03 16:05:51 +11002383 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thain32b26a12016-01-03 16:05:58 +11002384
Finn Thain8b00c3d2016-01-03 16:06:01 +11002385 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002386}
2387
2388
Finn Thain3be1b3e2016-01-03 16:05:12 +11002389/**
2390 * NCR5380_bus_reset - reset the SCSI bus
2391 * @cmd: SCSI command undergoing EH
Linus Torvalds1da177e2005-04-16 15:20:36 -07002392 *
Finn Thain3be1b3e2016-01-03 16:05:12 +11002393 * Returns SUCCESS
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394 */
2395
Finn Thain710ddd02014-11-12 16:12:02 +11002396static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002397{
2398 struct Scsi_Host *instance = cmd->device->host;
Finn Thain11d2f632016-01-03 16:05:51 +11002399 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain62717f52016-01-03 16:06:03 +11002400 int i;
Finn Thain11d2f632016-01-03 16:05:51 +11002401 unsigned long flags;
Finn Thain62717f52016-01-03 16:06:03 +11002402 struct NCR5380_cmd *ncmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002403
Finn Thain11d2f632016-01-03 16:05:51 +11002404 spin_lock_irqsave(&hostdata->lock, flags);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002405
2406#if (NDEBUG & NDEBUG_ANY)
Finn Thain62717f52016-01-03 16:06:03 +11002407 scmd_printk(KERN_INFO, cmd, __func__);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002408#endif
Finn Thaine5c3fdd2016-01-03 16:05:52 +11002409 NCR5380_dprint(NDEBUG_ANY, instance);
2410 NCR5380_dprint_phase(NDEBUG_ANY, instance);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002411
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002412 do_reset(instance);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002413
Finn Thain62717f52016-01-03 16:06:03 +11002414 /* reset NCR registers */
2415 NCR5380_write(MODE_REG, MR_BASE);
2416 NCR5380_write(TARGET_COMMAND_REG, 0);
2417 NCR5380_write(SELECT_ENABLE_REG, 0);
2418
2419 /* After the reset, there are no more connected or disconnected commands
2420 * and no busy units; so clear the low-level status here to avoid
2421 * conflicts when the mid-level code tries to wake up the affected
2422 * commands!
2423 */
2424
Finn Thain1884c282016-02-23 10:07:04 +11002425 if (list_del_cmd(&hostdata->unissued, cmd)) {
2426 cmd->result = DID_RESET << 16;
2427 cmd->scsi_done(cmd);
2428 }
2429
2430 if (hostdata->selecting) {
2431 hostdata->selecting->result = DID_RESET << 16;
2432 complete_cmd(instance, hostdata->selecting);
2433 hostdata->selecting = NULL;
2434 }
Finn Thain62717f52016-01-03 16:06:03 +11002435
2436 list_for_each_entry(ncmd, &hostdata->disconnected, list) {
2437 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2438
2439 set_host_byte(cmd, DID_RESET);
Finn Thain216fad92016-03-23 21:10:32 +11002440 complete_cmd(instance, cmd);
Finn Thain62717f52016-01-03 16:06:03 +11002441 }
Finn Thain1884c282016-02-23 10:07:04 +11002442 INIT_LIST_HEAD(&hostdata->disconnected);
Finn Thain62717f52016-01-03 16:06:03 +11002443
2444 list_for_each_entry(ncmd, &hostdata->autosense, list) {
2445 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2446
2447 set_host_byte(cmd, DID_RESET);
2448 cmd->scsi_done(cmd);
2449 }
Finn Thain1884c282016-02-23 10:07:04 +11002450 INIT_LIST_HEAD(&hostdata->autosense);
Finn Thain62717f52016-01-03 16:06:03 +11002451
2452 if (hostdata->connected) {
2453 set_host_byte(hostdata->connected, DID_RESET);
2454 complete_cmd(instance, hostdata->connected);
2455 hostdata->connected = NULL;
2456 }
2457
Finn Thain62717f52016-01-03 16:06:03 +11002458 for (i = 0; i < 8; ++i)
2459 hostdata->busy[i] = 0;
Finn Thain62717f52016-01-03 16:06:03 +11002460 hostdata->dma_len = 0;
Finn Thain62717f52016-01-03 16:06:03 +11002461
2462 queue_work(hostdata->work_q, &hostdata->main_task);
Finn Thain52d3e562016-03-23 21:10:20 +11002463 maybe_release_dma_irq(instance);
Finn Thain11d2f632016-01-03 16:05:51 +11002464 spin_unlock_irqrestore(&hostdata->lock, flags);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002465
Linus Torvalds1da177e2005-04-16 15:20:36 -07002466 return SUCCESS;
2467}