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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
32/*
Finn Thainaff0cf92016-01-03 16:06:09 +110033 * Further development / testing that should be done :
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete
Finn Thain594d4ba2016-01-03 16:06:10 +110035 * code so that everything does the same thing that's done at the
36 * end of a pseudo-DMA read operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 *
38 * 2. Fix REAL_DMA (interrupt driven, polled works fine) -
Finn Thain594d4ba2016-01-03 16:06:10 +110039 * basically, transfer size needs to be reduced by one
40 * and the last byte read as is done with PSEUDO_DMA.
Finn Thainaff0cf92016-01-03 16:06:09 +110041 *
42 * 4. Test SCSI-II tagged queueing (I have no devices which support
Finn Thain594d4ba2016-01-03 16:06:10 +110043 * tagged queueing)
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 */
45
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#ifndef notyet
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#undef REAL_DMA
48#endif
49
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#ifdef BOARD_REQUIRES_NO_DELAY
51#define io_recovery_delay(x)
52#else
53#define io_recovery_delay(x) udelay(x)
54#endif
55
56/*
57 * Design
58 *
Finn Thainaff0cf92016-01-03 16:06:09 +110059 * This is a generic 5380 driver. To use it on a different platform,
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 * one simply writes appropriate system specific macros (ie, data
Finn Thainaff0cf92016-01-03 16:06:09 +110061 * transfer - some PC's will use the I/O bus, 68K's must use
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 * memory mapped) and drops this file in their 'C' wrapper.
63 *
Finn Thainaff0cf92016-01-03 16:06:09 +110064 * As far as command queueing, two queues are maintained for
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 * each 5380 in the system - commands that haven't been issued yet,
Finn Thainaff0cf92016-01-03 16:06:09 +110066 * and commands that are currently executing. This means that an
67 * unlimited number of commands may be queued, letting
68 * more commands propagate from the higher driver levels giving higher
69 * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported,
70 * allowing multiple commands to propagate all the way to a SCSI-II device
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * while a command is already executing.
72 *
73 *
Finn Thainaff0cf92016-01-03 16:06:09 +110074 * Issues specific to the NCR5380 :
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 *
Finn Thainaff0cf92016-01-03 16:06:09 +110076 * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead
77 * piece of hardware that requires you to sit in a loop polling for
78 * the REQ signal as long as you are connected. Some devices are
79 * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect
Finn Thain686f3992016-01-03 16:05:26 +110080 * while doing long seek operations. [...] These
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 * broken devices are the exception rather than the rule and I'd rather
82 * spend my time optimizing for the normal case.
83 *
84 * Architecture :
85 *
86 * At the heart of the design is a coroutine, NCR5380_main,
87 * which is started from a workqueue for each NCR5380 host in the
88 * system. It attempts to establish I_T_L or I_T_L_Q nexuses by
89 * removing the commands from the issue queue and calling
Finn Thainaff0cf92016-01-03 16:06:09 +110090 * NCR5380_select() if a nexus is not established.
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 *
92 * Once a nexus is established, the NCR5380_information_transfer()
93 * phase goes through the various phases as instructed by the target.
94 * if the target goes into MSG IN and sends a DISCONNECT message,
95 * the command structure is placed into the per instance disconnected
Finn Thainaff0cf92016-01-03 16:06:09 +110096 * queue, and NCR5380_main tries to find more work. If the target is
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 * idle for too long, the system will try to sleep.
98 *
99 * If a command has disconnected, eventually an interrupt will trigger,
100 * calling NCR5380_intr() which will in turn call NCR5380_reselect
101 * to reestablish a nexus. This will run main if necessary.
102 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100103 * On command termination, the done function will be called as
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 * appropriate.
105 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100106 * SCSI pointers are maintained in the SCp field of SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 * structures, being initialized after the command is connected
108 * in NCR5380_select, and set as appropriate in NCR5380_information_transfer.
109 * Note that in violation of the standard, an implicit SAVE POINTERS operation
110 * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS.
111 */
112
113/*
114 * Using this file :
115 * This file a skeleton Linux SCSI driver for the NCR 5380 series
Finn Thainaff0cf92016-01-03 16:06:09 +1100116 * of chips. To use it, you write an architecture specific functions
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 * and macros and include this file in your driver.
118 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100119 * These macros control options :
120 * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be
Finn Thain594d4ba2016-01-03 16:06:10 +1100121 * defined.
Finn Thainaff0cf92016-01-03 16:06:09 +1100122 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically
Finn Thain594d4ba2016-01-03 16:06:10 +1100124 * for commands that return with a CHECK CONDITION status.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 *
126 * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential
Finn Thain594d4ba2016-01-03 16:06:10 +1100127 * transceivers.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 *
129 * DONT_USE_INTR - if defined, never use interrupts, even if we probe or
Finn Thain594d4ba2016-01-03 16:06:10 +1100130 * override-configure an IRQ.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
133 *
134 * REAL_DMA - if defined, REAL DMA is used during the data transfer phases.
135 *
136 * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't
Finn Thain594d4ba2016-01-03 16:06:10 +1100137 * rely on phase mismatch and EOP interrupts to determine end
138 * of phase.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 * These macros MUST be defined :
Finn Thainaff0cf92016-01-03 16:06:09 +1100141 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 * NCR5380_read(register) - read from the specified register
143 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100144 * NCR5380_write(register, value) - write to the specific register
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100146 * NCR5380_implementation_fields - additional fields needed for this
Finn Thain594d4ba2016-01-03 16:06:10 +1100147 * specific implementation of the NCR5380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 *
149 * Either real DMA *or* pseudo DMA may be implemented
Finn Thainaff0cf92016-01-03 16:06:09 +1100150 * REAL functions :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 * NCR5380_REAL_DMA should be defined if real DMA is to be used.
Finn Thainaff0cf92016-01-03 16:06:09 +1100152 * Note that the DMA setup functions should return the number of bytes
Finn Thain594d4ba2016-01-03 16:06:10 +1100153 * that they were able to program the controller for.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100155 * Also note that generic i386/PC versions of these macros are
Finn Thain594d4ba2016-01-03 16:06:10 +1100156 * available as NCR5380_i386_dma_write_setup,
157 * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 *
159 * NCR5380_dma_write_setup(instance, src, count) - initialize
160 * NCR5380_dma_read_setup(instance, dst, count) - initialize
161 * NCR5380_dma_residual(instance); - residual count
162 *
163 * PSEUDO functions :
164 * NCR5380_pwrite(instance, src, count)
165 * NCR5380_pread(instance, dst, count);
166 *
167 * The generic driver is initialized by calling NCR5380_init(instance),
Finn Thainaff0cf92016-01-03 16:06:09 +1100168 * after setting the appropriate host specific fields and ID. If the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance,
170 * possible) function may be used.
171 */
172
Finn Thain54d8fe42016-01-03 16:05:06 +1100173static int do_abort(struct Scsi_Host *);
174static void do_reset(struct Scsi_Host *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Finn Thainc16df322016-01-03 16:06:08 +1100176/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100177 * initialize_SCp - init the scsi pointer field
Finn Thain594d4ba2016-01-03 16:06:10 +1100178 * @cmd: command block to set up
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100180 * Set up the internal fields in the SCSI command.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 */
182
Finn Thain710ddd02014-11-12 16:12:02 +1100183static inline void initialize_SCp(struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184{
Finn Thainaff0cf92016-01-03 16:06:09 +1100185 /*
186 * Initialize the Scsi Pointer field so that all of the commands in the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 * various queues are valid.
188 */
189
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200190 if (scsi_bufflen(cmd)) {
191 cmd->SCp.buffer = scsi_sglist(cmd);
192 cmd->SCp.buffers_residual = scsi_sg_count(cmd) - 1;
Jens Axboe45711f12007-10-22 21:19:53 +0200193 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 cmd->SCp.this_residual = cmd->SCp.buffer->length;
195 } else {
196 cmd->SCp.buffer = NULL;
197 cmd->SCp.buffers_residual = 0;
Boaz Harrosh9e0fe442007-11-05 11:23:35 +0200198 cmd->SCp.ptr = NULL;
199 cmd->SCp.this_residual = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 }
Finn Thainf27db8e2016-01-03 16:06:00 +1100201
202 cmd->SCp.Status = 0;
203 cmd->SCp.Message = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204}
205
206/**
Finn Thainb32ade12016-01-03 16:05:41 +1100207 * NCR5380_poll_politely2 - wait for two chip register values
Finn Thain2f854b82016-01-03 16:05:22 +1100208 * @instance: controller to poll
Finn Thainb32ade12016-01-03 16:05:41 +1100209 * @reg1: 5380 register to poll
210 * @bit1: Bitmask to check
211 * @val1: Expected value
212 * @reg2: Second 5380 register to poll
213 * @bit2: Second bitmask to check
214 * @val2: Second expected value
Finn Thain2f854b82016-01-03 16:05:22 +1100215 * @wait: Time-out in jiffies
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 *
Finn Thain2f854b82016-01-03 16:05:22 +1100217 * Polls the chip in a reasonably efficient manner waiting for an
218 * event to occur. After a short quick poll we begin to yield the CPU
219 * (if possible). In irq contexts the time-out is arbitrarily limited.
220 * Callers may hold locks as long as they are held in irq mode.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 *
Finn Thainb32ade12016-01-03 16:05:41 +1100222 * Returns 0 if either or both event(s) occurred otherwise -ETIMEDOUT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Finn Thainb32ade12016-01-03 16:05:41 +1100225static int NCR5380_poll_politely2(struct Scsi_Host *instance,
226 int reg1, int bit1, int val1,
227 int reg2, int bit2, int val2, int wait)
Finn Thain2f854b82016-01-03 16:05:22 +1100228{
229 struct NCR5380_hostdata *hostdata = shost_priv(instance);
230 unsigned long deadline = jiffies + wait;
231 unsigned long n;
232
233 /* Busy-wait for up to 10 ms */
234 n = min(10000U, jiffies_to_usecs(wait));
235 n *= hostdata->accesses_per_ms;
Finn Thainb32ade12016-01-03 16:05:41 +1100236 n /= 2000;
Finn Thain2f854b82016-01-03 16:05:22 +1100237 do {
Finn Thainb32ade12016-01-03 16:05:41 +1100238 if ((NCR5380_read(reg1) & bit1) == val1)
239 return 0;
240 if ((NCR5380_read(reg2) & bit2) == val2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 return 0;
242 cpu_relax();
Finn Thain2f854b82016-01-03 16:05:22 +1100243 } while (n--);
244
245 if (irqs_disabled() || in_interrupt())
246 return -ETIMEDOUT;
247
248 /* Repeatedly sleep for 1 ms until deadline */
249 while (time_is_after_jiffies(deadline)) {
250 schedule_timeout_uninterruptible(1);
Finn Thainb32ade12016-01-03 16:05:41 +1100251 if ((NCR5380_read(reg1) & bit1) == val1)
252 return 0;
253 if ((NCR5380_read(reg2) & bit2) == val2)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 }
Finn Thain2f854b82016-01-03 16:05:22 +1100256
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return -ETIMEDOUT;
258}
259
Finn Thainb32ade12016-01-03 16:05:41 +1100260static inline int NCR5380_poll_politely(struct Scsi_Host *instance,
261 int reg, int bit, int val, int wait)
262{
263 return NCR5380_poll_politely2(instance, reg, bit, val,
264 reg, bit, val, wait);
265}
266
viro@ZenIV.linux.org.uk185a7a12005-09-07 23:18:24 +0100267#if NDEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268static struct {
269 unsigned char mask;
270 const char *name;
Finn Thainaff0cf92016-01-03 16:06:09 +1100271} signals[] = {
272 {SR_DBP, "PARITY"},
273 {SR_RST, "RST"},
274 {SR_BSY, "BSY"},
275 {SR_REQ, "REQ"},
276 {SR_MSG, "MSG"},
277 {SR_CD, "CD"},
278 {SR_IO, "IO"},
279 {SR_SEL, "SEL"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100281},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282basrs[] = {
Finn Thainaff0cf92016-01-03 16:06:09 +1100283 {BASR_ATN, "ATN"},
284 {BASR_ACK, "ACK"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100286},
287icrs[] = {
288 {ICR_ASSERT_RST, "ASSERT RST"},
289 {ICR_ASSERT_ACK, "ASSERT ACK"},
290 {ICR_ASSERT_BSY, "ASSERT BSY"},
291 {ICR_ASSERT_SEL, "ASSERT SEL"},
292 {ICR_ASSERT_ATN, "ASSERT ATN"},
293 {ICR_ASSERT_DATA, "ASSERT DATA"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 {0, NULL}
Finn Thainaff0cf92016-01-03 16:06:09 +1100295},
296mrs[] = {
297 {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"},
298 {MR_TARGET, "MODE TARGET"},
299 {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"},
300 {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"},
Finn Thain0d2cf862016-01-03 16:06:11 +1100301 {MR_ENABLE_EOP_INTR, "MODE EOP INTR"},
Finn Thainaff0cf92016-01-03 16:06:09 +1100302 {MR_MONITOR_BSY, "MODE MONITOR BSY"},
303 {MR_DMA_MODE, "MODE DMA"},
304 {MR_ARBITRATE, "MODE ARBITRATION"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 {0, NULL}
306};
307
308/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100309 * NCR5380_print - print scsi bus signals
310 * @instance: adapter state to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100312 * Print the SCSI bus signals for debugging purposes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 */
314
315static void NCR5380_print(struct Scsi_Host *instance)
316{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 unsigned char status, data, basr, mr, icr, i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 data = NCR5380_read(CURRENT_SCSI_DATA_REG);
320 status = NCR5380_read(STATUS_REG);
321 mr = NCR5380_read(MODE_REG);
322 icr = NCR5380_read(INITIATOR_COMMAND_REG);
323 basr = NCR5380_read(BUS_AND_STATUS_REG);
324
325 printk("STATUS_REG: %02x ", status);
326 for (i = 0; signals[i].mask; ++i)
327 if (status & signals[i].mask)
328 printk(",%s", signals[i].name);
329 printk("\nBASR: %02x ", basr);
330 for (i = 0; basrs[i].mask; ++i)
331 if (basr & basrs[i].mask)
332 printk(",%s", basrs[i].name);
333 printk("\nICR: %02x ", icr);
334 for (i = 0; icrs[i].mask; ++i)
335 if (icr & icrs[i].mask)
336 printk(",%s", icrs[i].name);
337 printk("\nMODE: %02x ", mr);
338 for (i = 0; mrs[i].mask; ++i)
339 if (mr & mrs[i].mask)
340 printk(",%s", mrs[i].name);
341 printk("\n");
342}
343
Finn Thain0d2cf862016-01-03 16:06:11 +1100344static struct {
345 unsigned char value;
346 const char *name;
347} phases[] = {
348 {PHASE_DATAOUT, "DATAOUT"},
349 {PHASE_DATAIN, "DATAIN"},
350 {PHASE_CMDOUT, "CMDOUT"},
351 {PHASE_STATIN, "STATIN"},
352 {PHASE_MSGOUT, "MSGOUT"},
353 {PHASE_MSGIN, "MSGIN"},
354 {PHASE_UNKNOWN, "UNKNOWN"}
355};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Finn Thainc16df322016-01-03 16:06:08 +1100357/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100358 * NCR5380_print_phase - show SCSI phase
Finn Thain594d4ba2016-01-03 16:06:10 +1100359 * @instance: adapter to dump
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100361 * Print the current SCSI phase for debugging purposes
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 */
363
364static void NCR5380_print_phase(struct Scsi_Host *instance)
365{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 unsigned char status;
367 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368
369 status = NCR5380_read(STATUS_REG);
370 if (!(status & SR_REQ))
Finn Thain6a6ff4a2016-01-03 16:06:04 +1100371 shost_printk(KERN_DEBUG, instance, "REQ not asserted, phase unknown.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 else {
Finn Thain0d2cf862016-01-03 16:06:11 +1100373 for (i = 0; (phases[i].value != PHASE_UNKNOWN) &&
374 (phases[i].value != (status & PHASE_MASK)); ++i)
375 ;
Finn Thain6a6ff4a2016-01-03 16:06:04 +1100376 shost_printk(KERN_DEBUG, instance, "phase %s\n", phases[i].name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
378}
379#endif
380
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
Finn Thaind5f7e652016-01-03 16:05:03 +1100382static int probe_irq __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383
384/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100385 * probe_intr - helper for IRQ autoprobe
386 * @irq: interrupt number
387 * @dev_id: unused
388 * @regs: unused
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100390 * Set a flag to indicate the IRQ in question was received. This is
391 * used by the IRQ probe code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 */
Finn Thainaff0cf92016-01-03 16:06:09 +1100393
David Howells7d12e782006-10-05 14:55:46 +0100394static irqreturn_t __init probe_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 probe_irq = irq;
397 return IRQ_HANDLED;
398}
399
400/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100401 * NCR5380_probe_irq - find the IRQ of an NCR5380
402 * @instance: NCR5380 controller
403 * @possible: bitmask of ISA IRQ lines
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100405 * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ
406 * and then looking to see what interrupt actually turned up.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 */
408
Andrew Morton702809c2007-05-23 14:41:56 -0700409static int __init __maybe_unused NCR5380_probe_irq(struct Scsi_Host *instance,
410 int possible)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411{
Finn Thaine8a60142016-01-03 16:05:54 +1100412 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 unsigned long timeout;
414 int trying_irqs, i, mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
Finn Thain22f5f102014-11-12 16:11:56 +1100416 for (trying_irqs = 0, i = 1, mask = 2; i < 16; ++i, mask <<= 1)
Michael Opdenacker4909cc22014-03-05 06:09:41 +0100417 if ((mask & possible) && (request_irq(i, &probe_intr, 0, "NCR-probe", NULL) == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 trying_irqs |= mask;
419
Nicholas Mc Guire4e5a8002015-02-04 13:30:20 -0500420 timeout = jiffies + msecs_to_jiffies(250);
Finn Thain22f5f102014-11-12 16:11:56 +1100421 probe_irq = NO_IRQ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422
423 /*
424 * A interrupt is triggered whenever BSY = false, SEL = true
Finn Thainaff0cf92016-01-03 16:06:09 +1100425 * and a bit set in the SELECT_ENABLE_REG is asserted on the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 * SCSI bus.
427 *
428 * Note that the bus is only driven when the phase control signals
429 * (I/O, C/D, and MSG) match those in the TCR, so we must reset that
430 * to zero.
431 */
432
433 NCR5380_write(TARGET_COMMAND_REG, 0);
434 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
435 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
436 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
437
Finn Thain22f5f102014-11-12 16:11:56 +1100438 while (probe_irq == NO_IRQ && time_before(jiffies, timeout))
Nishanth Aravamudana9a30472005-11-07 01:01:20 -0800439 schedule_timeout_uninterruptible(1);
Finn Thainaff0cf92016-01-03 16:06:09 +1100440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 NCR5380_write(SELECT_ENABLE_REG, 0);
442 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
443
Finn Thain22f5f102014-11-12 16:11:56 +1100444 for (i = 1, mask = 2; i < 16; ++i, mask <<= 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (trying_irqs & mask)
446 free_irq(i, NULL);
447
448 return probe_irq;
449}
450
451/**
Finn Thain594d4ba2016-01-03 16:06:10 +1100452 * NCR58380_info - report driver and host information
453 * @instance: relevant scsi host instance
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100455 * For use as the host template info() handler.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 */
457
Finn Thain8c325132014-11-12 16:11:58 +1100458static const char *NCR5380_info(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
Finn Thain8c325132014-11-12 16:11:58 +1100460 struct NCR5380_hostdata *hostdata = shost_priv(instance);
461
462 return hostdata->info;
463}
464
465static void prepare_info(struct Scsi_Host *instance)
466{
467 struct NCR5380_hostdata *hostdata = shost_priv(instance);
468
469 snprintf(hostdata->info, sizeof(hostdata->info),
470 "%s, io_port 0x%lx, n_io_port %d, "
471 "base 0x%lx, irq %d, "
472 "can_queue %d, cmd_per_lun %d, "
473 "sg_tablesize %d, this_id %d, "
Finn Thainbe3f4122016-01-03 16:05:50 +1100474 "flags { %s%s%s}, "
Finn Thain8c325132014-11-12 16:11:58 +1100475 "options { %s} ",
476 instance->hostt->name, instance->io_port, instance->n_io_port,
477 instance->base, instance->irq,
478 instance->can_queue, instance->cmd_per_lun,
479 instance->sg_tablesize, instance->this_id,
Finn Thain55181be2016-01-03 16:05:42 +1100480 hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "",
Finn Thain8c325132014-11-12 16:11:58 +1100481 hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
Finn Thain9c3f0e22016-01-03 16:05:11 +1100482 hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483#ifdef AUTOPROBE_IRQ
Finn Thain8c325132014-11-12 16:11:58 +1100484 "AUTOPROBE_IRQ "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486#ifdef DIFFERENTIAL
Finn Thain8c325132014-11-12 16:11:58 +1100487 "DIFFERENTIAL "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488#endif
489#ifdef REAL_DMA
Finn Thain8c325132014-11-12 16:11:58 +1100490 "REAL_DMA "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491#endif
492#ifdef REAL_DMA_POLL
Finn Thain8c325132014-11-12 16:11:58 +1100493 "REAL_DMA_POLL "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494#endif
495#ifdef PARITY
Finn Thain8c325132014-11-12 16:11:58 +1100496 "PARITY "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497#endif
498#ifdef PSEUDO_DMA
Finn Thain8c325132014-11-12 16:11:58 +1100499 "PSEUDO_DMA "
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500#endif
Finn Thain8c325132014-11-12 16:11:58 +1100501 "");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502}
503
Finn Thaina9c2dc42014-11-12 16:11:59 +1100504#ifdef PSEUDO_DMA
Al Virodd7ab712013-03-31 01:15:54 -0400505static int __maybe_unused NCR5380_write_info(struct Scsi_Host *instance,
506 char *buffer, int length)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
Finn Thaina9c2dc42014-11-12 16:11:59 +1100508 struct NCR5380_hostdata *hostdata = shost_priv(instance);
509
510 hostdata->spin_max_r = 0;
511 hostdata->spin_max_w = 0;
512 return 0;
Al Virodd7ab712013-03-31 01:15:54 -0400513}
Al Virodd7ab712013-03-31 01:15:54 -0400514
515static int __maybe_unused NCR5380_show_info(struct seq_file *m,
Finn Thain0d2cf862016-01-03 16:06:11 +1100516 struct Scsi_Host *instance)
Al Virodd7ab712013-03-31 01:15:54 -0400517{
Finn Thaine8a60142016-01-03 16:05:54 +1100518 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
Rasmus Villemoes0c3de382014-12-03 00:10:49 +0100520 seq_printf(m, "Highwater I/O busy spin counts: write %d, read %d\n",
Finn Thaina9c2dc42014-11-12 16:11:59 +1100521 hostdata->spin_max_w, hostdata->spin_max_r);
Al Virodd7ab712013-03-31 01:15:54 -0400522 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523}
Finn Thaine5c3fdd2016-01-03 16:05:52 +1100524#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100527 * NCR5380_init - initialise an NCR5380
Finn Thain594d4ba2016-01-03 16:06:10 +1100528 * @instance: adapter to configure
529 * @flags: control flags
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100531 * Initializes *instance and corresponding 5380 chip,
532 * with flags OR'd into the initial flags value.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100534 * Notes : I assume that the host, hostno, and id bits have been
Finn Thain0d2cf862016-01-03 16:06:11 +1100535 * set correctly. I don't care about the irq and other fields.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100537 * Returns 0 for success
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538 */
539
Greg Kroah-Hartman6f039792012-12-21 13:08:55 -0800540static int NCR5380_init(struct Scsi_Host *instance, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541{
Finn Thaine8a60142016-01-03 16:05:54 +1100542 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thainb6488f92016-01-03 16:05:08 +1100543 int i;
Finn Thain2f854b82016-01-03 16:05:22 +1100544 unsigned long deadline;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545
Finn Thain0d2cf862016-01-03 16:06:11 +1100546 hostdata->host = instance;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 hostdata->id_mask = 1 << instance->this_id;
Finn Thain0d2cf862016-01-03 16:06:11 +1100548 hostdata->id_higher_mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 for (i = hostdata->id_mask; i <= 0x80; i <<= 1)
550 if (i > hostdata->id_mask)
551 hostdata->id_higher_mask |= i;
552 for (i = 0; i < 8; ++i)
553 hostdata->busy[i] = 0;
554#ifdef REAL_DMA
555 hostdata->dmalen = 0;
556#endif
Finn Thain11d2f632016-01-03 16:05:51 +1100557 spin_lock_init(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 hostdata->connected = NULL;
Finn Thainf27db8e2016-01-03 16:06:00 +1100559 hostdata->sensing = NULL;
560 INIT_LIST_HEAD(&hostdata->autosense);
Finn Thain32b26a12016-01-03 16:05:58 +1100561 INIT_LIST_HEAD(&hostdata->unissued);
562 INIT_LIST_HEAD(&hostdata->disconnected);
563
Finn Thain55181be2016-01-03 16:05:42 +1100564 hostdata->flags = flags;
Finn Thainaff0cf92016-01-03 16:06:09 +1100565
Finn Thain8d8601a2016-01-03 16:05:37 +1100566 INIT_WORK(&hostdata->main_task, NCR5380_main);
Finn Thain0ad0eff2016-01-03 16:05:21 +1100567 hostdata->work_q = alloc_workqueue("ncr5380_%d",
568 WQ_UNBOUND | WQ_MEM_RECLAIM,
569 1, instance->host_no);
570 if (!hostdata->work_q)
571 return -ENOMEM;
572
Finn Thain8c325132014-11-12 16:11:58 +1100573 prepare_info(instance);
574
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
576 NCR5380_write(MODE_REG, MR_BASE);
577 NCR5380_write(TARGET_COMMAND_REG, 0);
578 NCR5380_write(SELECT_ENABLE_REG, 0);
Finn Thain2f854b82016-01-03 16:05:22 +1100579
580 /* Calibrate register polling loop */
581 i = 0;
582 deadline = jiffies + 1;
583 do {
584 cpu_relax();
585 } while (time_is_after_jiffies(deadline));
586 deadline += msecs_to_jiffies(256);
587 do {
588 NCR5380_read(STATUS_REG);
589 ++i;
590 cpu_relax();
591 } while (time_is_after_jiffies(deadline));
592 hostdata->accesses_per_ms = i / 256;
593
Finn Thainb6488f92016-01-03 16:05:08 +1100594 return 0;
595}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Finn Thainb6488f92016-01-03 16:05:08 +1100597/**
598 * NCR5380_maybe_reset_bus - Detect and correct bus wedge problems.
599 * @instance: adapter to check
600 *
601 * If the system crashed, it may have crashed with a connected target and
602 * the SCSI bus busy. Check for BUS FREE phase. If not, try to abort the
603 * currently established nexus, which we know nothing about. Failing that
604 * do a bus reset.
605 *
606 * Note that a bus reset will cause the chip to assert IRQ.
607 *
608 * Returns 0 if successful, otherwise -ENXIO.
609 */
610
611static int NCR5380_maybe_reset_bus(struct Scsi_Host *instance)
612{
Finn Thain9c3f0e22016-01-03 16:05:11 +1100613 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thainb6488f92016-01-03 16:05:08 +1100614 int pass;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700615
616 for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) {
617 switch (pass) {
618 case 1:
619 case 3:
620 case 5:
Finn Thain636b1ec2016-01-03 16:05:10 +1100621 shost_printk(KERN_ERR, instance, "SCSI bus busy, waiting up to five seconds\n");
622 NCR5380_poll_politely(instance,
623 STATUS_REG, SR_BSY, 0, 5 * HZ);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 break;
625 case 2:
Finn Thain636b1ec2016-01-03 16:05:10 +1100626 shost_printk(KERN_ERR, instance, "bus busy, attempting abort\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 do_abort(instance);
628 break;
629 case 4:
Finn Thain636b1ec2016-01-03 16:05:10 +1100630 shost_printk(KERN_ERR, instance, "bus busy, attempting reset\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631 do_reset(instance);
Finn Thain9c3f0e22016-01-03 16:05:11 +1100632 /* Wait after a reset; the SCSI standard calls for
633 * 250ms, we wait 500ms to be on the safe side.
634 * But some Toshiba CD-ROMs need ten times that.
635 */
636 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
637 msleep(2500);
638 else
639 msleep(500);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 break;
641 case 6:
Finn Thain636b1ec2016-01-03 16:05:10 +1100642 shost_printk(KERN_ERR, instance, "bus locked solid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 return -ENXIO;
644 }
645 }
646 return 0;
647}
648
649/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100650 * NCR5380_exit - remove an NCR5380
Finn Thain594d4ba2016-01-03 16:06:10 +1100651 * @instance: adapter to remove
Finn Thain0d2cf862016-01-03 16:06:11 +1100652 *
653 * Assumes that no more work can be queued (e.g. by NCR5380_intr).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 */
655
Randy Dunlapa43cf0f2008-01-22 21:39:33 -0800656static void NCR5380_exit(struct Scsi_Host *instance)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657{
Finn Thaine8a60142016-01-03 16:05:54 +1100658 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659
Finn Thain8d8601a2016-01-03 16:05:37 +1100660 cancel_work_sync(&hostdata->main_task);
Finn Thain0ad0eff2016-01-03 16:05:21 +1100661 destroy_workqueue(hostdata->work_q);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662}
663
664/**
Finn Thain677e0192016-01-03 16:05:59 +1100665 * complete_cmd - finish processing a command and return it to the SCSI ML
666 * @instance: the host instance
667 * @cmd: command to complete
668 */
669
670static void complete_cmd(struct Scsi_Host *instance,
671 struct scsi_cmnd *cmd)
672{
673 struct NCR5380_hostdata *hostdata = shost_priv(instance);
674
675 dsprintk(NDEBUG_QUEUES, instance, "complete_cmd: cmd %p\n", cmd);
676
Finn Thainf27db8e2016-01-03 16:06:00 +1100677 if (hostdata->sensing == cmd) {
678 /* Autosense processing ends here */
679 if ((cmd->result & 0xff) != SAM_STAT_GOOD) {
680 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
681 set_host_byte(cmd, DID_ERROR);
682 } else
683 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
684 hostdata->sensing = NULL;
685 }
686
Finn Thain677e0192016-01-03 16:05:59 +1100687 hostdata->busy[scmd_id(cmd)] &= ~(1 << cmd->device->lun);
688
689 cmd->scsi_done(cmd);
690}
691
692/**
Finn Thain1bb40582016-01-03 16:05:29 +1100693 * NCR5380_queue_command - queue a command
694 * @instance: the relevant SCSI adapter
695 * @cmd: SCSI command
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 *
Finn Thain1bb40582016-01-03 16:05:29 +1100697 * cmd is added to the per-instance issue queue, with minor
698 * twiddling done to the host specific fields of cmd. If the
699 * main coroutine is not running, it is restarted.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 */
701
Finn Thain1bb40582016-01-03 16:05:29 +1100702static int NCR5380_queue_command(struct Scsi_Host *instance,
703 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704{
Finn Thain1bb40582016-01-03 16:05:29 +1100705 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain32b26a12016-01-03 16:05:58 +1100706 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
Finn Thain1bb40582016-01-03 16:05:29 +1100707 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708
709#if (NDEBUG & NDEBUG_NO_WRITE)
710 switch (cmd->cmnd[0]) {
711 case WRITE_6:
712 case WRITE_10:
Finn Thaindbb6b352016-01-03 16:05:53 +1100713 shost_printk(KERN_DEBUG, instance, "WRITE attempted with NDEBUG_NO_WRITE set\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714 cmd->result = (DID_ERROR << 16);
Finn Thain1bb40582016-01-03 16:05:29 +1100715 cmd->scsi_done(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716 return 0;
717 }
Finn Thain0d2cf862016-01-03 16:06:11 +1100718#endif /* (NDEBUG & NDEBUG_NO_WRITE) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720 cmd->result = 0;
721
Finn Thain11d2f632016-01-03 16:05:51 +1100722 spin_lock_irqsave(&hostdata->lock, flags);
Finn Thain1bb40582016-01-03 16:05:29 +1100723
Finn Thainaff0cf92016-01-03 16:06:09 +1100724 /*
725 * Insert the cmd into the issue queue. Note that REQUEST SENSE
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 * commands are added to the head of the queue since any command will
Finn Thainaff0cf92016-01-03 16:06:09 +1100727 * clear the contingent allegiance condition that exists and the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 * sense data is only guaranteed to be valid while the condition exists.
729 */
730
Finn Thain32b26a12016-01-03 16:05:58 +1100731 if (cmd->cmnd[0] == REQUEST_SENSE)
732 list_add(&ncmd->list, &hostdata->unissued);
733 else
734 list_add_tail(&ncmd->list, &hostdata->unissued);
735
Finn Thain11d2f632016-01-03 16:05:51 +1100736 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thain1bb40582016-01-03 16:05:29 +1100737
Finn Thaindbb6b352016-01-03 16:05:53 +1100738 dsprintk(NDEBUG_QUEUES, instance, "command %p added to %s of queue\n",
739 cmd, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 /* Kick off command processing */
Finn Thain8d8601a2016-01-03 16:05:37 +1100742 queue_work(hostdata->work_q, &hostdata->main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 return 0;
744}
745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746/**
Finn Thainf27db8e2016-01-03 16:06:00 +1100747 * dequeue_next_cmd - dequeue a command for processing
748 * @instance: the scsi host instance
749 *
750 * Priority is given to commands on the autosense queue. These commands
751 * need autosense because of a CHECK CONDITION result.
752 *
753 * Returns a command pointer if a command is found for a target that is
754 * not already busy. Otherwise returns NULL.
755 */
756
757static struct scsi_cmnd *dequeue_next_cmd(struct Scsi_Host *instance)
758{
759 struct NCR5380_hostdata *hostdata = shost_priv(instance);
760 struct NCR5380_cmd *ncmd;
761 struct scsi_cmnd *cmd;
762
763 if (list_empty(&hostdata->autosense)) {
764 list_for_each_entry(ncmd, &hostdata->unissued, list) {
765 cmd = NCR5380_to_scmd(ncmd);
766 dsprintk(NDEBUG_QUEUES, instance, "dequeue: cmd=%p target=%d busy=0x%02x lun=%llu\n",
767 cmd, scmd_id(cmd), hostdata->busy[scmd_id(cmd)], cmd->device->lun);
768
769 if (!(hostdata->busy[scmd_id(cmd)] & (1 << cmd->device->lun))) {
770 list_del(&ncmd->list);
771 dsprintk(NDEBUG_QUEUES, instance,
772 "dequeue: removed %p from issue queue\n", cmd);
773 return cmd;
774 }
775 }
776 } else {
777 /* Autosense processing begins here */
778 ncmd = list_first_entry(&hostdata->autosense,
779 struct NCR5380_cmd, list);
780 list_del(&ncmd->list);
781 cmd = NCR5380_to_scmd(ncmd);
782 dsprintk(NDEBUG_QUEUES, instance,
783 "dequeue: removed %p from autosense queue\n", cmd);
784 scsi_eh_prep_cmnd(cmd, &hostdata->ses, NULL, 0, ~0);
785 hostdata->sensing = cmd;
786 return cmd;
787 }
788 return NULL;
789}
790
791static void requeue_cmd(struct Scsi_Host *instance, struct scsi_cmnd *cmd)
792{
793 struct NCR5380_hostdata *hostdata = shost_priv(instance);
794 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
795
796 if (hostdata->sensing) {
797 scsi_eh_restore_cmnd(cmd, &hostdata->ses);
798 list_add(&ncmd->list, &hostdata->autosense);
799 hostdata->sensing = NULL;
800 } else
801 list_add(&ncmd->list, &hostdata->unissued);
802}
803
804/**
Finn Thain0d2cf862016-01-03 16:06:11 +1100805 * NCR5380_main - NCR state machines
Linus Torvalds1da177e2005-04-16 15:20:36 -0700806 *
Finn Thain594d4ba2016-01-03 16:06:10 +1100807 * NCR5380_main is a coroutine that runs as long as more work can
808 * be done on the NCR5380 host adapters in a system. Both
809 * NCR5380_queue_command() and NCR5380_intr() will try to start it
810 * in case it is not running.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 */
812
David Howellsc4028952006-11-22 14:57:56 +0000813static void NCR5380_main(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814{
David Howellsc4028952006-11-22 14:57:56 +0000815 struct NCR5380_hostdata *hostdata =
Finn Thain8d8601a2016-01-03 16:05:37 +1100816 container_of(work, struct NCR5380_hostdata, main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 struct Scsi_Host *instance = hostdata->host;
Finn Thainf27db8e2016-01-03 16:06:00 +1100818 struct scsi_cmnd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 int done;
Finn Thainaff0cf92016-01-03 16:06:09 +1100820
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 done = 1;
Finn Thain11d2f632016-01-03 16:05:51 +1100823
Finn Thain0a4e3612016-01-03 16:06:07 +1100824 spin_lock_irq(&hostdata->lock);
Finn Thainf27db8e2016-01-03 16:06:00 +1100825 while (!hostdata->connected &&
826 (cmd = dequeue_next_cmd(instance))) {
827
828 dsprintk(NDEBUG_MAIN, instance, "main: dequeued %p\n", cmd);
829
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 /*
Finn Thainf27db8e2016-01-03 16:06:00 +1100831 * Attempt to establish an I_T_L nexus here.
832 * On success, instance->hostdata->connected is set.
833 * On failure, we must add the command back to the
834 * issue queue so we can keep trying.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 */
Finn Thainf27db8e2016-01-03 16:06:00 +1100836 /*
837 * REQUEST SENSE commands are issued without tagged
838 * queueing, even on SCSI-II devices because the
839 * contingent allegiance condition exists for the
840 * entire unit.
841 */
Finn Thain32b26a12016-01-03 16:05:58 +1100842
Finn Thain707d62b2016-01-03 16:06:02 +1100843 cmd = NCR5380_select(instance, cmd);
844 if (!cmd) {
845 dsprintk(NDEBUG_MAIN, instance, "main: select complete\n");
Finn Thainf27db8e2016-01-03 16:06:00 +1100846 } else {
847 dsprintk(NDEBUG_MAIN | NDEBUG_QUEUES, instance,
848 "main: select failed, returning %p to queue\n", cmd);
849 requeue_cmd(instance, cmd);
850 }
851 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 if (hostdata->connected
853#ifdef REAL_DMA
854 && !hostdata->dmalen
855#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 ) {
Finn Thainb7465452016-01-03 16:06:05 +1100857 dsprintk(NDEBUG_MAIN, instance, "main: performing information transfer\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 NCR5380_information_transfer(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 done = 0;
Finn Thain1d3db592016-01-03 16:05:24 +1100860 }
Finn Thain0a4e3612016-01-03 16:06:07 +1100861 spin_unlock_irq(&hostdata->lock);
862 if (!done)
863 cond_resched();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 } while (!done);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865}
866
867#ifndef DONT_USE_INTR
868
869/**
Finn Thaincd400822016-01-03 16:05:40 +1100870 * NCR5380_intr - generic NCR5380 irq handler
871 * @irq: interrupt number
872 * @dev_id: device info
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 *
Finn Thaincd400822016-01-03 16:05:40 +1100874 * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses
875 * from the disconnected queue, and restarting NCR5380_main()
876 * as required.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 *
Finn Thaincd400822016-01-03 16:05:40 +1100878 * The chip can assert IRQ in any of six different conditions. The IRQ flag
879 * is then cleared by reading the Reset Parity/Interrupt Register (RPIR).
880 * Three of these six conditions are latched in the Bus and Status Register:
881 * - End of DMA (cleared by ending DMA Mode)
882 * - Parity error (cleared by reading RPIR)
883 * - Loss of BSY (cleared by reading RPIR)
884 * Two conditions have flag bits that are not latched:
885 * - Bus phase mismatch (non-maskable in DMA Mode, cleared by ending DMA Mode)
886 * - Bus reset (non-maskable)
887 * The remaining condition has no flag bit at all:
888 * - Selection/reselection
889 *
890 * Hence, establishing the cause(s) of any interrupt is partly guesswork.
891 * In "The DP8490 and DP5380 Comparison Guide", National Semiconductor
892 * claimed that "the design of the [DP8490] interrupt logic ensures
893 * interrupts will not be lost (they can be on the DP5380)."
894 * The L5380/53C80 datasheet from LOGIC Devices has more details.
895 *
896 * Checking for bus reset by reading RST is futile because of interrupt
897 * latency, but a bus reset will reset chip logic. Checking for parity error
898 * is unnecessary because that interrupt is never enabled. A Loss of BSY
899 * condition will clear DMA Mode. We can tell when this occurs because the
900 * the Busy Monitor interrupt is enabled together with DMA Mode.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700901 */
902
Finn Thaincd400822016-01-03 16:05:40 +1100903static irqreturn_t NCR5380_intr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904{
Jeff Garzikbaa9aac2007-12-13 16:14:14 -0800905 struct Scsi_Host *instance = dev_id;
Finn Thaincd400822016-01-03 16:05:40 +1100906 struct NCR5380_hostdata *hostdata = shost_priv(instance);
907 int handled = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 unsigned char basr;
909 unsigned long flags;
910
Finn Thain11d2f632016-01-03 16:05:51 +1100911 spin_lock_irqsave(&hostdata->lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912
Finn Thaincd400822016-01-03 16:05:40 +1100913 basr = NCR5380_read(BUS_AND_STATUS_REG);
914 if (basr & BASR_IRQ) {
915 unsigned char mr = NCR5380_read(MODE_REG);
916 unsigned char sr = NCR5380_read(STATUS_REG);
917
Finn Thainb7465452016-01-03 16:06:05 +1100918 dsprintk(NDEBUG_INTR, instance, "IRQ %d, BASR 0x%02x, SR 0x%02x, MR 0x%02x\n",
919 irq, basr, sr, mr);
Finn Thaincd400822016-01-03 16:05:40 +1100920
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921#if defined(REAL_DMA)
Finn Thaincd400822016-01-03 16:05:40 +1100922 if ((mr & MR_DMA_MODE) || (mr & MR_MONITOR_BSY)) {
923 /* Probably End of DMA, Phase Mismatch or Loss of BSY.
924 * We ack IRQ after clearing Mode Register. Workarounds
925 * for End of DMA errata need to happen in DMA Mode.
926 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927
Finn Thainb7465452016-01-03 16:06:05 +1100928 dsprintk(NDEBUG_INTR, instance, "interrupt in DMA mode\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929
Finn Thaincd400822016-01-03 16:05:40 +1100930 int transferred;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931
Finn Thaincd400822016-01-03 16:05:40 +1100932 if (!hostdata->connected)
933 panic("scsi%d : DMA interrupt with no connected cmd\n",
934 instance->hostno);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935
Finn Thaincd400822016-01-03 16:05:40 +1100936 transferred = hostdata->dmalen - NCR5380_dma_residual(instance);
937 hostdata->connected->SCp.this_residual -= transferred;
938 hostdata->connected->SCp.ptr += transferred;
939 hostdata->dmalen = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
Finn Thaincd400822016-01-03 16:05:40 +1100941 /* FIXME: we need to poll briefly then defer a workqueue task ! */
942 NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2 * HZ);
943
944 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
945 NCR5380_write(MODE_REG, MR_BASE);
946 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
947 } else
948#endif /* REAL_DMA */
949 if ((NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_mask) &&
950 (sr & (SR_SEL | SR_IO | SR_BSY | SR_RST)) == (SR_SEL | SR_IO)) {
951 /* Probably reselected */
952 NCR5380_write(SELECT_ENABLE_REG, 0);
953 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
954
Finn Thainb7465452016-01-03 16:06:05 +1100955 dsprintk(NDEBUG_INTR, instance, "interrupt with SEL and IO\n");
Finn Thaincd400822016-01-03 16:05:40 +1100956
957 if (!hostdata->connected) {
958 NCR5380_reselect(instance);
959 queue_work(hostdata->work_q, &hostdata->main_task);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 }
Finn Thaincd400822016-01-03 16:05:40 +1100961 if (!hostdata->connected)
962 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
963 } else {
964 /* Probably Bus Reset */
965 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
966
Finn Thainb7465452016-01-03 16:06:05 +1100967 dsprintk(NDEBUG_INTR, instance, "unknown interrupt\n");
Finn Thaincd400822016-01-03 16:05:40 +1100968 }
969 handled = 1;
970 } else {
971 shost_printk(KERN_NOTICE, instance, "interrupt without IRQ bit\n");
972 }
973
Finn Thain11d2f632016-01-03 16:05:51 +1100974 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thaincd400822016-01-03 16:05:40 +1100975
976 return IRQ_RETVAL(handled);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700977}
978
Finn Thainaff0cf92016-01-03 16:06:09 +1100979#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980
Finn Thainaff0cf92016-01-03 16:06:09 +1100981/*
Finn Thain710ddd02014-11-12 16:12:02 +1100982 * Function : int NCR5380_select(struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +1100983 * struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 *
985 * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command,
Finn Thain594d4ba2016-01-03 16:06:10 +1100986 * including ARBITRATION, SELECTION, and initial message out for
987 * IDENTIFY and queue messages.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100989 * Inputs : instance - instantiation of the 5380 driver on which this
Finn Thain594d4ba2016-01-03 16:06:10 +1100990 * target lives, cmd - SCSI command to execute.
Finn Thainaff0cf92016-01-03 16:06:09 +1100991 *
Finn Thain707d62b2016-01-03 16:06:02 +1100992 * Returns cmd if selection failed but should be retried,
993 * NULL if selection failed and should not be retried, or
994 * NULL if selection succeeded (hostdata->connected == cmd).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 *
Finn Thainaff0cf92016-01-03 16:06:09 +1100996 * Side effects :
Finn Thain594d4ba2016-01-03 16:06:10 +1100997 * If bus busy, arbitration failed, etc, NCR5380_select() will exit
998 * with registers as they should have been on entry - ie
999 * SELECT_ENABLE will be set appropriately, the NCR5380
1000 * will cease to drive any SCSI bus signals.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001002 * If successful : I_T_L or I_T_L_Q nexus will be established,
1003 * instance->connected will be set to cmd.
1004 * SELECT interrupt will be disabled.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001006 * If failed (no target) : cmd->scsi_done() will be called, and the
1007 * cmd->result host byte set to DID_BAD_TARGET.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 */
Finn Thainaff0cf92016-01-03 16:06:09 +11001009
Finn Thain707d62b2016-01-03 16:06:02 +11001010static struct scsi_cmnd *NCR5380_select(struct Scsi_Host *instance,
1011 struct scsi_cmnd *cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012{
Finn Thaine8a60142016-01-03 16:05:54 +11001013 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 unsigned char tmp[3], phase;
1015 unsigned char *data;
1016 int len;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018
Linus Torvalds1da177e2005-04-16 15:20:36 -07001019 NCR5380_dprint(NDEBUG_ARBITRATION, instance);
Finn Thainb7465452016-01-03 16:06:05 +11001020 dsprintk(NDEBUG_ARBITRATION, instance, "starting arbitration, id = %d\n",
1021 instance->this_id);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022
Finn Thain707d62b2016-01-03 16:06:02 +11001023 /*
1024 * Arbitration and selection phases are slow and involve dropping the
1025 * lock, so we have to watch out for EH. An exception handler may
1026 * change 'selecting' to NULL. This function will then return NULL
1027 * so that the caller will forget about 'cmd'. (During information
1028 * transfer phases, EH may change 'connected' to NULL.)
1029 */
1030 hostdata->selecting = cmd;
1031
Finn Thainaff0cf92016-01-03 16:06:09 +11001032 /*
1033 * Set the phase bits to 0, otherwise the NCR5380 won't drive the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 * data bus during SELECTION.
1035 */
1036
1037 NCR5380_write(TARGET_COMMAND_REG, 0);
1038
Finn Thainaff0cf92016-01-03 16:06:09 +11001039 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 * Start arbitration.
1041 */
1042
1043 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
1044 NCR5380_write(MODE_REG, MR_ARBITRATE);
1045
Finn Thain55500d92016-01-03 16:05:35 +11001046 /* The chip now waits for BUS FREE phase. Then after the 800 ns
1047 * Bus Free Delay, arbitration will begin.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 */
1049
Finn Thain11d2f632016-01-03 16:05:51 +11001050 spin_unlock_irq(&hostdata->lock);
Finn Thainb32ade12016-01-03 16:05:41 +11001051 err = NCR5380_poll_politely2(instance, MODE_REG, MR_ARBITRATE, 0,
1052 INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS,
1053 ICR_ARBITRATION_PROGRESS, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11001054 spin_lock_irq(&hostdata->lock);
Finn Thainb32ade12016-01-03 16:05:41 +11001055 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE)) {
1056 /* Reselection interrupt */
Finn Thain707d62b2016-01-03 16:06:02 +11001057 goto out;
Finn Thainb32ade12016-01-03 16:05:41 +11001058 }
1059 if (err < 0) {
1060 NCR5380_write(MODE_REG, MR_BASE);
1061 shost_printk(KERN_ERR, instance,
1062 "select: arbitration timeout\n");
Finn Thain707d62b2016-01-03 16:06:02 +11001063 goto out;
Finn Thain55500d92016-01-03 16:05:35 +11001064 }
Finn Thain11d2f632016-01-03 16:05:51 +11001065 spin_unlock_irq(&hostdata->lock);
Finn Thain55500d92016-01-03 16:05:35 +11001066
1067 /* The SCSI-2 arbitration delay is 2.4 us */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 udelay(3);
1069
1070 /* Check for lost arbitration */
Finn Thain0d2cf862016-01-03 16:06:11 +11001071 if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) ||
1072 (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) ||
1073 (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 NCR5380_write(MODE_REG, MR_BASE);
Finn Thainb7465452016-01-03 16:06:05 +11001075 dsprintk(NDEBUG_ARBITRATION, instance, "lost arbitration, deasserting MR_ARBITRATE\n");
Finn Thain11d2f632016-01-03 16:05:51 +11001076 spin_lock_irq(&hostdata->lock);
Finn Thain707d62b2016-01-03 16:06:02 +11001077 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 }
Finn Thaincf13b082016-01-03 16:05:18 +11001079
1080 /* After/during arbitration, BSY should be asserted.
1081 * IBM DPES-31080 Version S31Q works now
1082 * Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman)
1083 */
1084 NCR5380_write(INITIATOR_COMMAND_REG,
1085 ICR_BASE | ICR_ASSERT_SEL | ICR_ASSERT_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086
Finn Thainaff0cf92016-01-03 16:06:09 +11001087 /*
1088 * Again, bus clear + bus settle time is 1.2us, however, this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 * a minimum so we'll udelay ceil(1.2)
1090 */
1091
Finn Thain9c3f0e22016-01-03 16:05:11 +11001092 if (hostdata->flags & FLAG_TOSHIBA_DELAY)
1093 udelay(15);
1094 else
1095 udelay(2);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096
Finn Thain11d2f632016-01-03 16:05:51 +11001097 spin_lock_irq(&hostdata->lock);
1098
Finn Thain72064a72016-01-03 16:05:44 +11001099 /* NCR5380_reselect() clears MODE_REG after a reselection interrupt */
1100 if (!(NCR5380_read(MODE_REG) & MR_ARBITRATE))
Finn Thain707d62b2016-01-03 16:06:02 +11001101 goto out;
1102
1103 if (!hostdata->selecting) {
1104 NCR5380_write(MODE_REG, MR_BASE);
1105 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1106 goto out;
1107 }
Finn Thain72064a72016-01-03 16:05:44 +11001108
Finn Thainb7465452016-01-03 16:06:05 +11001109 dsprintk(NDEBUG_ARBITRATION, instance, "won arbitration\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110
Finn Thainaff0cf92016-01-03 16:06:09 +11001111 /*
1112 * Now that we have won arbitration, start Selection process, asserting
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 * the host and target ID's on the SCSI bus.
1114 */
1115
Finn Thain3d07d222016-01-03 16:06:13 +11001116 NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask | (1 << scmd_id(cmd)));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117
Finn Thainaff0cf92016-01-03 16:06:09 +11001118 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 * Raise ATN while SEL is true before BSY goes false from arbitration,
1120 * since this is the only way to guarantee that we'll get a MESSAGE OUT
1121 * phase immediately after selection.
1122 */
1123
Finn Thain3d07d222016-01-03 16:06:13 +11001124 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY |
1125 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 NCR5380_write(MODE_REG, MR_BASE);
1127
Finn Thainaff0cf92016-01-03 16:06:09 +11001128 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 * Reselect interrupts must be turned off prior to the dropping of BSY,
1130 * otherwise we will trigger an interrupt.
1131 */
1132 NCR5380_write(SELECT_ENABLE_REG, 0);
1133
Finn Thain11d2f632016-01-03 16:05:51 +11001134 spin_unlock_irq(&hostdata->lock);
1135
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001137 * The initiator shall then wait at least two deskew delays and release
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 * the BSY signal.
1139 */
Finn Thain0d2cf862016-01-03 16:06:11 +11001140 udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141
1142 /* Reset BSY */
Finn Thain3d07d222016-01-03 16:06:13 +11001143 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA |
1144 ICR_ASSERT_ATN | ICR_ASSERT_SEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001145
Finn Thainaff0cf92016-01-03 16:06:09 +11001146 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147 * Something weird happens when we cease to drive BSY - looks
Finn Thainaff0cf92016-01-03 16:06:09 +11001148 * like the board/chip is letting us do another read before the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 * appropriate propagation delay has expired, and we're confusing
1150 * a BSY signal from ourselves as the target's response to SELECTION.
1151 *
1152 * A small delay (the 'C++' frontend breaks the pipeline with an
1153 * unnecessary jump, making it work on my 386-33/Trantor T128, the
Finn Thainaff0cf92016-01-03 16:06:09 +11001154 * tighter 'C' code breaks and requires this) solves the problem -
1155 * the 1 us delay is arbitrary, and only used because this delay will
1156 * be the same on other platforms and since it works here, it should
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 * work there.
1158 *
1159 * wingel suggests that this could be due to failing to wait
1160 * one deskew delay.
1161 */
1162
1163 udelay(1);
1164
Finn Thainb7465452016-01-03 16:06:05 +11001165 dsprintk(NDEBUG_SELECTION, instance, "selecting target %d\n", scmd_id(cmd));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001166
Finn Thainaff0cf92016-01-03 16:06:09 +11001167 /*
1168 * The SCSI specification calls for a 250 ms timeout for the actual
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 * selection.
1170 */
1171
Finn Thainae753a32016-01-03 16:05:23 +11001172 err = NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, SR_BSY,
1173 msecs_to_jiffies(250));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) {
Finn Thain11d2f632016-01-03 16:05:51 +11001176 spin_lock_irq(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1178 NCR5380_reselect(instance);
Finn Thaincd400822016-01-03 16:05:40 +11001179 if (!hostdata->connected)
1180 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001181 shost_printk(KERN_ERR, instance, "reselection after won arbitration?\n");
Finn Thain707d62b2016-01-03 16:06:02 +11001182 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 }
Finn Thainae753a32016-01-03 16:05:23 +11001184
1185 if (err < 0) {
Finn Thain11d2f632016-01-03 16:05:51 +11001186 spin_lock_irq(&hostdata->lock);
Finn Thainae753a32016-01-03 16:05:23 +11001187 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thainae753a32016-01-03 16:05:23 +11001188 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain707d62b2016-01-03 16:06:02 +11001189 /* Can't touch cmd if it has been reclaimed by the scsi ML */
1190 if (hostdata->selecting) {
1191 cmd->result = DID_BAD_TARGET << 16;
1192 complete_cmd(instance, cmd);
1193 dsprintk(NDEBUG_SELECTION, instance, "target did not respond within 250ms\n");
1194 cmd = NULL;
1195 }
1196 goto out;
Finn Thainae753a32016-01-03 16:05:23 +11001197 }
1198
Finn Thainaff0cf92016-01-03 16:06:09 +11001199 /*
1200 * No less than two deskew delays after the initiator detects the
1201 * BSY signal is true, it shall release the SEL signal and may
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 * change the DATA BUS. -wingel
1203 */
1204
1205 udelay(1);
1206
1207 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1208
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001210 * Since we followed the SCSI spec, and raised ATN while SEL
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 * was true but before BSY was false during selection, the information
1212 * transfer phase should be a MESSAGE OUT phase so that we can send the
1213 * IDENTIFY message.
Finn Thainaff0cf92016-01-03 16:06:09 +11001214 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG
1216 * message (2 bytes) with a tag ID that we increment with every command
1217 * until it wraps back to 0.
1218 *
1219 * XXX - it turns out that there are some broken SCSI-II devices,
Finn Thain594d4ba2016-01-03 16:06:10 +11001220 * which claim to support tagged queuing but fail when more than
1221 * some number of commands are issued at once.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 */
1223
1224 /* Wait for start of REQ/ACK handshake */
1225
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226 err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11001227 spin_lock_irq(&hostdata->lock);
Finn Thain1cc160e2016-01-03 16:05:32 +11001228 if (err < 0) {
Finn Thain55500d92016-01-03 16:05:35 +11001229 shost_printk(KERN_ERR, instance, "select: REQ timeout\n");
1230 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001231 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Finn Thain707d62b2016-01-03 16:06:02 +11001232 goto out;
1233 }
1234 if (!hostdata->selecting) {
1235 do_abort(instance);
1236 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 }
1238
Finn Thainb7465452016-01-03 16:06:05 +11001239 dsprintk(NDEBUG_SELECTION, instance, "target %d selected, going into MESSAGE OUT phase.\n",
1240 scmd_id(cmd));
Finn Thain22f5f102014-11-12 16:11:56 +11001241 tmp[0] = IDENTIFY(((instance->irq == NO_IRQ) ? 0 : 1), cmd->device->lun);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242
1243 len = 1;
1244 cmd->tag = 0;
1245
1246 /* Send message(s) */
1247 data = tmp;
1248 phase = PHASE_MSGOUT;
1249 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001250 dsprintk(NDEBUG_SELECTION, instance, "nexus established.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001251 /* XXX need to handle errors here */
Finn Thain11d2f632016-01-03 16:05:51 +11001252
Linus Torvalds1da177e2005-04-16 15:20:36 -07001253 hostdata->connected = cmd;
Finn Thain3d07d222016-01-03 16:06:13 +11001254 hostdata->busy[cmd->device->id] |= 1 << cmd->device->lun;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
Boaz Harrosh28424d32007-09-10 22:37:45 +03001256 initialize_SCp(cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001257
Finn Thain707d62b2016-01-03 16:06:02 +11001258 cmd = NULL;
1259
1260out:
1261 if (!hostdata->selecting)
1262 return NULL;
1263 hostdata->selecting = NULL;
1264 return cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265}
1266
Finn Thainaff0cf92016-01-03 16:06:09 +11001267/*
1268 * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +11001269 * unsigned char *phase, int *count, unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001270 *
1271 * Purpose : transfers data in given phase using polled I/O
1272 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001273 * Inputs : instance - instance of driver, *phase - pointer to
Finn Thain594d4ba2016-01-03 16:06:10 +11001274 * what phase is expected, *count - pointer to number of
1275 * bytes to transfer, **data - pointer to data pointer.
Finn Thainaff0cf92016-01-03 16:06:09 +11001276 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 * Returns : -1 when different phase is entered without transferring
Finn Thain0d2cf862016-01-03 16:06:11 +11001278 * maximum number of bytes, 0 if all bytes are transferred or exit
Finn Thain594d4ba2016-01-03 16:06:10 +11001279 * is in same phase.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001281 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001282 *
1283 * XXX Note : handling for bus free may be useful.
1284 */
1285
1286/*
Finn Thainaff0cf92016-01-03 16:06:09 +11001287 * Note : this code is not as quick as it could be, however it
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288 * IS 100% reliable, and for the actual data transfer where speed
1289 * counts, we will always do a pseudo DMA or DMA transfer.
1290 */
1291
Finn Thain0d2cf862016-01-03 16:06:11 +11001292static int NCR5380_transfer_pio(struct Scsi_Host *instance,
1293 unsigned char *phase, int *count,
1294 unsigned char **data)
1295{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 unsigned char p = *phase, tmp;
1297 int c = *count;
1298 unsigned char *d = *data;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299
Finn Thainaff0cf92016-01-03 16:06:09 +11001300 /*
1301 * The NCR5380 chip will only drive the SCSI bus when the
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 * phase specified in the appropriate bits of the TARGET COMMAND
1303 * REGISTER match the STATUS REGISTER
1304 */
1305
Finn Thain0d2cf862016-01-03 16:06:11 +11001306 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308 do {
Finn Thainaff0cf92016-01-03 16:06:09 +11001309 /*
1310 * Wait for assertion of REQ, after which the phase bits will be
1311 * valid
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312 */
1313
Finn Thain686f3992016-01-03 16:05:26 +11001314 if (NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ) < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001315 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316
Finn Thainb7465452016-01-03 16:06:05 +11001317 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ asserted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318
1319 /* Check for phase mismatch */
Finn Thain686f3992016-01-03 16:05:26 +11001320 if ((NCR5380_read(STATUS_REG) & PHASE_MASK) != p) {
Finn Thainb7465452016-01-03 16:06:05 +11001321 dsprintk(NDEBUG_PIO, instance, "phase mismatch\n");
1322 NCR5380_dprint_phase(NDEBUG_PIO, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323 break;
1324 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001325
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 /* Do actual transfer from SCSI bus to / from memory */
1327 if (!(p & SR_IO))
1328 NCR5380_write(OUTPUT_DATA_REG, *d);
1329 else
1330 *d = NCR5380_read(CURRENT_SCSI_DATA_REG);
1331
1332 ++d;
1333
Finn Thainaff0cf92016-01-03 16:06:09 +11001334 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 * The SCSI standard suggests that in MSGOUT phase, the initiator
1336 * should drop ATN on the last byte of the message phase
1337 * after REQ has been asserted for the handshake but before
1338 * the initiator raises ACK.
1339 */
1340
1341 if (!(p & SR_IO)) {
1342 if (!((p & SR_MSG) && c > 1)) {
1343 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1344 NCR5380_dprint(NDEBUG_PIO, instance);
Finn Thain3d07d222016-01-03 16:06:13 +11001345 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1346 ICR_ASSERT_DATA | ICR_ASSERT_ACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347 } else {
Finn Thain3d07d222016-01-03 16:06:13 +11001348 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1349 ICR_ASSERT_DATA | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 NCR5380_dprint(NDEBUG_PIO, instance);
Finn Thain3d07d222016-01-03 16:06:13 +11001351 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1352 ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353 }
1354 } else {
1355 NCR5380_dprint(NDEBUG_PIO, instance);
1356 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK);
1357 }
1358
Finn Thaina2edc4a2016-01-03 16:05:27 +11001359 if (NCR5380_poll_politely(instance,
1360 STATUS_REG, SR_REQ, 0, 5 * HZ) < 0)
1361 break;
1362
Finn Thainb7465452016-01-03 16:06:05 +11001363 dsprintk(NDEBUG_HANDSHAKE, instance, "REQ negated, handshake complete\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
1365/*
Finn Thainaff0cf92016-01-03 16:06:09 +11001366 * We have several special cases to consider during REQ/ACK handshaking :
1367 * 1. We were in MSGOUT phase, and we are on the last byte of the
Finn Thain594d4ba2016-01-03 16:06:10 +11001368 * message. ATN must be dropped as ACK is dropped.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001370 * 2. We are in a MSGIN phase, and we are on the last byte of the
Finn Thain594d4ba2016-01-03 16:06:10 +11001371 * message. We must exit with ACK asserted, so that the calling
1372 * code may raise ATN before dropping ACK to reject the message.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373 *
1374 * 3. ACK and ATN are clear and the target may proceed as normal.
1375 */
1376 if (!(p == PHASE_MSGIN && c == 1)) {
1377 if (p == PHASE_MSGOUT && c > 1)
1378 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1379 else
1380 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1381 }
1382 } while (--c);
1383
Finn Thainb7465452016-01-03 16:06:05 +11001384 dsprintk(NDEBUG_PIO, instance, "residual %d\n", c);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001385
1386 *count = c;
1387 *data = d;
1388 tmp = NCR5380_read(STATUS_REG);
Finn Thaina2edc4a2016-01-03 16:05:27 +11001389 /* The phase read from the bus is valid if either REQ is (already)
1390 * asserted or if ACK hasn't been released yet. The latter applies if
1391 * we're in MSG IN, DATA IN or STATUS and all bytes have been received.
1392 */
1393 if ((tmp & SR_REQ) || ((tmp & SR_IO) && c == 0))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001394 *phase = tmp & PHASE_MASK;
1395 else
1396 *phase = PHASE_UNKNOWN;
1397
1398 if (!c || (*phase == p))
1399 return 0;
1400 else
1401 return -1;
1402}
1403
1404/**
Finn Thain636b1ec2016-01-03 16:05:10 +11001405 * do_reset - issue a reset command
1406 * @instance: adapter to reset
Linus Torvalds1da177e2005-04-16 15:20:36 -07001407 *
Finn Thain636b1ec2016-01-03 16:05:10 +11001408 * Issue a reset sequence to the NCR5380 and try and get the bus
1409 * back into sane shape.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 *
Finn Thain636b1ec2016-01-03 16:05:10 +11001411 * This clears the reset interrupt flag because there may be no handler for
1412 * it. When the driver is initialized, the NCR5380_intr() handler has not yet
1413 * been installed. And when in EH we may have released the ST DMA interrupt.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001414 */
Finn Thainaff0cf92016-01-03 16:06:09 +11001415
Finn Thain54d8fe42016-01-03 16:05:06 +11001416static void do_reset(struct Scsi_Host *instance)
1417{
Finn Thain636b1ec2016-01-03 16:05:10 +11001418 unsigned long flags;
1419
1420 local_irq_save(flags);
1421 NCR5380_write(TARGET_COMMAND_REG,
1422 PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST);
Finn Thain636b1ec2016-01-03 16:05:10 +11001424 udelay(50);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001425 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain636b1ec2016-01-03 16:05:10 +11001426 (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG);
1427 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428}
1429
Finn Thain80d3eb62016-01-03 16:05:34 +11001430/**
1431 * do_abort - abort the currently established nexus by going to
1432 * MESSAGE OUT phase and sending an ABORT message.
1433 * @instance: relevant scsi host instance
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 *
Finn Thain80d3eb62016-01-03 16:05:34 +11001435 * Returns 0 on success, -1 on failure.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 */
1437
Finn Thain54d8fe42016-01-03 16:05:06 +11001438static int do_abort(struct Scsi_Host *instance)
1439{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440 unsigned char *msgptr, phase, tmp;
1441 int len;
1442 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443
1444 /* Request message out phase */
1445 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
1446
Finn Thainaff0cf92016-01-03 16:06:09 +11001447 /*
1448 * Wait for the target to indicate a valid phase by asserting
1449 * REQ. Once this happens, we'll have either a MSGOUT phase
1450 * and can immediately send the ABORT message, or we'll have some
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 * other phase and will have to source/sink data.
Finn Thainaff0cf92016-01-03 16:06:09 +11001452 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453 * We really don't care what value was on the bus or what value
1454 * the target sees, so we just handshake.
1455 */
1456
Finn Thain80d3eb62016-01-03 16:05:34 +11001457 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 10 * HZ);
Finn Thain1cc160e2016-01-03 16:05:32 +11001458 if (rc < 0)
Finn Thain80d3eb62016-01-03 16:05:34 +11001459 goto timeout;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460
Finn Thainf35d3472016-01-03 16:05:33 +11001461 tmp = NCR5380_read(STATUS_REG) & PHASE_MASK;
Finn Thainaff0cf92016-01-03 16:06:09 +11001462
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1464
Finn Thainf35d3472016-01-03 16:05:33 +11001465 if (tmp != PHASE_MSGOUT) {
Finn Thain0d2cf862016-01-03 16:06:11 +11001466 NCR5380_write(INITIATOR_COMMAND_REG,
1467 ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK);
Finn Thain54d8fe42016-01-03 16:05:06 +11001468 rc = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 3 * HZ);
Finn Thain1cc160e2016-01-03 16:05:32 +11001469 if (rc < 0)
Finn Thain80d3eb62016-01-03 16:05:34 +11001470 goto timeout;
1471 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001473
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474 tmp = ABORT;
1475 msgptr = &tmp;
1476 len = 1;
1477 phase = PHASE_MSGOUT;
Finn Thain54d8fe42016-01-03 16:05:06 +11001478 NCR5380_transfer_pio(instance, &phase, &len, &msgptr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
1480 /*
1481 * If we got here, and the command completed successfully,
1482 * we're about to go into bus free state.
1483 */
1484
1485 return len ? -1 : 0;
Finn Thain80d3eb62016-01-03 16:05:34 +11001486
1487timeout:
1488 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1489 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490}
1491
1492#if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL)
Finn Thainaff0cf92016-01-03 16:06:09 +11001493/*
1494 * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance,
Finn Thain594d4ba2016-01-03 16:06:10 +11001495 * unsigned char *phase, int *count, unsigned char **data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 *
1497 * Purpose : transfers data in given phase using either real
Finn Thain594d4ba2016-01-03 16:06:10 +11001498 * or pseudo DMA.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001500 * Inputs : instance - instance of driver, *phase - pointer to
Finn Thain594d4ba2016-01-03 16:06:10 +11001501 * what phase is expected, *count - pointer to number of
1502 * bytes to transfer, **data - pointer to data pointer.
Finn Thainaff0cf92016-01-03 16:06:09 +11001503 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 * Returns : -1 when different phase is entered without transferring
Finn Thain594d4ba2016-01-03 16:06:10 +11001505 * maximum number of bytes, 0 if all bytes or transferred or exit
1506 * is in same phase.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 *
Finn Thain594d4ba2016-01-03 16:06:10 +11001508 * Also, *phase, *count, *data are modified in place.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 */
1510
1511
Finn Thain0d2cf862016-01-03 16:06:11 +11001512static int NCR5380_transfer_dma(struct Scsi_Host *instance,
1513 unsigned char *phase, int *count,
1514 unsigned char **data)
1515{
1516 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 register int c = *count;
1518 register unsigned char p = *phase;
1519 register unsigned char *d = *data;
1520 unsigned char tmp;
1521 int foo;
1522#if defined(REAL_DMA_POLL)
1523 int cnt, toPIO;
1524 unsigned char saved_data = 0, overrun = 0, residue;
1525#endif
1526
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527 if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) {
1528 *phase = tmp;
1529 return -1;
1530 }
1531#if defined(REAL_DMA) || defined(REAL_DMA_POLL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 if (p & SR_IO) {
Finn Thain9db60242016-01-03 16:05:43 +11001533 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS))
1534 c -= 2;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001536 hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c);
Finn Thainb7465452016-01-03 16:06:05 +11001537
1538 dsprintk(NDEBUG_DMA, instance, "initializing DMA %s: length %d, address %p\n",
1539 (p & SR_IO) ? "receive" : "send", c, *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540#endif
1541
1542 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p));
1543
1544#ifdef REAL_DMA
Finn Thaincd400822016-01-03 16:05:40 +11001545 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1546 MR_ENABLE_EOP_INTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547#elif defined(REAL_DMA_POLL)
Finn Thaincd400822016-01-03 16:05:40 +11001548 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001549#else
1550 /*
1551 * Note : on my sample board, watch-dog timeouts occurred when interrupts
Finn Thainaff0cf92016-01-03 16:06:09 +11001552 * were not disabled for the duration of a single DMA transfer, from
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553 * before the setting of DMA mode to after transfer of the last byte.
1554 */
1555
Finn Thain55181be2016-01-03 16:05:42 +11001556 if (hostdata->flags & FLAG_NO_DMA_FIXUP)
Finn Thaincd400822016-01-03 16:05:40 +11001557 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
1558 MR_ENABLE_EOP_INTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001559 else
Finn Thaincd400822016-01-03 16:05:40 +11001560 NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561#endif /* def REAL_DMA */
1562
Finn Thain52a6a1c2014-03-18 11:42:18 +11001563 dprintk(NDEBUG_DMA, "scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564
Finn Thainaff0cf92016-01-03 16:06:09 +11001565 /*
Finn Thain594d4ba2016-01-03 16:06:10 +11001566 * On the PAS16 at least I/O recovery delays are not needed here.
1567 * Everyone else seems to want them.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 */
1569
1570 if (p & SR_IO) {
1571 io_recovery_delay(1);
1572 NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0);
1573 } else {
1574 io_recovery_delay(1);
1575 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA);
1576 io_recovery_delay(1);
1577 NCR5380_write(START_DMA_SEND_REG, 0);
1578 io_recovery_delay(1);
1579 }
1580
1581#if defined(REAL_DMA_POLL)
1582 do {
1583 tmp = NCR5380_read(BUS_AND_STATUS_REG);
1584 } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER)));
1585
1586/*
Finn Thainc16df322016-01-03 16:06:08 +11001587 * At this point, either we've completed DMA, or we have a phase mismatch,
1588 * or we've unexpectedly lost BUSY (which is a real error).
1589 *
1590 * For DMA sends, we want to wait until the last byte has been
1591 * transferred out over the bus before we turn off DMA mode. Alas, there
1592 * seems to be no terribly good way of doing this on a 5380 under all
1593 * conditions. For non-scatter-gather operations, we can wait until REQ
1594 * and ACK both go false, or until a phase mismatch occurs. Gather-sends
1595 * are nastier, since the device will be expecting more data than we
1596 * are prepared to send it, and REQ will remain asserted. On a 53C8[01] we
1597 * could test Last Byte Sent to assure transfer (I imagine this is precisely
1598 * why this signal was added to the newer chips) but on the older 538[01]
1599 * this signal does not exist. The workaround for this lack is a watchdog;
1600 * we bail out of the wait-loop after a modest amount of wait-time if
1601 * the usual exit conditions are not met. Not a terribly clean or
1602 * correct solution :-%
1603 *
1604 * DMA receive is equally tricky due to a nasty characteristic of the NCR5380.
1605 * If the chip is in DMA receive mode, it will respond to a target's
1606 * REQ by latching the SCSI data into the INPUT DATA register and asserting
1607 * ACK, even if it has _already_ been notified by the DMA controller that
1608 * the current DMA transfer has completed! If the NCR5380 is then taken
1609 * out of DMA mode, this already-acknowledged byte is lost. This is
1610 * not a problem for "one DMA transfer per READ command", because
1611 * the situation will never arise... either all of the data is DMA'ed
1612 * properly, or the target switches to MESSAGE IN phase to signal a
1613 * disconnection (either operation bringing the DMA to a clean halt).
1614 * However, in order to handle scatter-receive, we must work around the
1615 * problem. The chosen fix is to DMA N-2 bytes, then check for the
1616 * condition before taking the NCR5380 out of DMA mode. One or two extra
1617 * bytes are transferred via PIO as necessary to fill out the original
1618 * request.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 */
1620
1621 if (p & SR_IO) {
Finn Thain9db60242016-01-03 16:05:43 +11001622 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS)) {
1623 udelay(10);
1624 if ((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) ==
1625 (BASR_PHASE_MATCH | BASR_ACK)) {
1626 saved_data = NCR5380_read(INPUT_DATA_REGISTER);
1627 overrun = 1;
1628 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001630 } else {
1631 int limit = 100;
1632 while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) {
1633 if (!(tmp & BASR_PHASE_MATCH))
1634 break;
1635 if (--limit < 0)
1636 break;
1637 }
1638 }
1639
Finn Thainb7465452016-01-03 16:06:05 +11001640 dsprintk(NDEBUG_DMA, "polled DMA transfer complete, basr 0x%02x, sr 0x%02x\n",
1641 tmp, NCR5380_read(STATUS_REG));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001642
1643 NCR5380_write(MODE_REG, MR_BASE);
1644 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1645
1646 residue = NCR5380_dma_residual(instance);
1647 c -= residue;
1648 *count -= c;
1649 *data += c;
1650 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
1651
Finn Thain9db60242016-01-03 16:05:43 +11001652 if (!(hostdata->flags & FLAG_NO_DMA_FIXUPS) &&
1653 *phase == p && (p & SR_IO) && residue == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001654 if (overrun) {
Finn Thain52a6a1c2014-03-18 11:42:18 +11001655 dprintk(NDEBUG_DMA, "Got an input overrun, using saved byte\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656 **data = saved_data;
1657 *data += 1;
1658 *count -= 1;
1659 cnt = toPIO = 1;
1660 } else {
1661 printk("No overrun??\n");
1662 cnt = toPIO = 2;
1663 }
Finn Thain52a6a1c2014-03-18 11:42:18 +11001664 dprintk(NDEBUG_DMA, "Doing %d-byte PIO to 0x%X\n", cnt, *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001665 NCR5380_transfer_pio(instance, phase, &cnt, data);
1666 *count -= toPIO - cnt;
1667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668
Finn Thain52a6a1c2014-03-18 11:42:18 +11001669 dprintk(NDEBUG_DMA, "Return with data ptr = 0x%X, count %d, last 0x%X, next 0x%X\n", *data, *count, *(*data + *count - 1), *(*data + *count));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001670 return 0;
1671
1672#elif defined(REAL_DMA)
1673 return 0;
1674#else /* defined(REAL_DMA_POLL) */
1675 if (p & SR_IO) {
Finn Thain55181be2016-01-03 16:05:42 +11001676 foo = NCR5380_pread(instance, d,
1677 hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1);
1678 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001680 * We can't disable DMA mode after successfully transferring
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681 * what we plan to be the last byte, since that would open up
Finn Thainaff0cf92016-01-03 16:06:09 +11001682 * a race condition where if the target asserted REQ before
Linus Torvalds1da177e2005-04-16 15:20:36 -07001683 * we got the DMA mode reset, the NCR5380 would have latched
1684 * an additional byte into the INPUT DATA register and we'd
1685 * have dropped it.
Finn Thainaff0cf92016-01-03 16:06:09 +11001686 *
1687 * The workaround was to transfer one fewer bytes than we
1688 * intended to with the pseudo-DMA read function, wait for
Linus Torvalds1da177e2005-04-16 15:20:36 -07001689 * the chip to latch the last byte, read it, and then disable
1690 * pseudo-DMA mode.
Finn Thainaff0cf92016-01-03 16:06:09 +11001691 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07001692 * After REQ is asserted, the NCR5380 asserts DRQ and ACK.
1693 * REQ is deasserted when ACK is asserted, and not reasserted
1694 * until ACK goes false. Since the NCR5380 won't lower ACK
1695 * until DACK is asserted, which won't happen unless we twiddle
Finn Thainaff0cf92016-01-03 16:06:09 +11001696 * the DMA port or we take the NCR5380 out of DMA mode, we
1697 * can guarantee that we won't handshake another extra
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698 * byte.
1699 */
1700
Finn Thain55181be2016-01-03 16:05:42 +11001701 if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG,
1702 BASR_DRQ, BASR_DRQ, HZ) < 0) {
1703 foo = -1;
1704 shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001705 }
Finn Thain55181be2016-01-03 16:05:42 +11001706 if (NCR5380_poll_politely(instance, STATUS_REG,
1707 SR_REQ, 0, HZ) < 0) {
1708 foo = -1;
1709 shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
1710 }
1711 d[c - 1] = NCR5380_read(INPUT_DATA_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001712 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001714 foo = NCR5380_pwrite(instance, d, c);
Finn Thain55181be2016-01-03 16:05:42 +11001715 if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001716 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001717 * Wait for the last byte to be sent. If REQ is being asserted for
1718 * the byte we're interested, we'll ACK it and it will go false.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001719 */
Finn Thain55181be2016-01-03 16:05:42 +11001720 if (NCR5380_poll_politely2(instance,
1721 BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
1722 BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
1723 foo = -1;
1724 shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001725 }
1726 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 }
1728 NCR5380_write(MODE_REG, MR_BASE);
1729 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thaincd400822016-01-03 16:05:40 +11001730 NCR5380_read(RESET_PARITY_INTERRUPT_REG);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001731 *data = d + c;
1732 *count = 0;
1733 *phase = NCR5380_read(STATUS_REG) & PHASE_MASK;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001734 return foo;
1735#endif /* def REAL_DMA */
1736}
1737#endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */
1738
1739/*
1740 * Function : NCR5380_information_transfer (struct Scsi_Host *instance)
1741 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001742 * Purpose : run through the various SCSI phases and do as the target
Finn Thain594d4ba2016-01-03 16:06:10 +11001743 * directs us to. Operates on the currently connected command,
1744 * instance->connected.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001745 *
1746 * Inputs : instance, instance for which we are doing commands
1747 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001748 * Side effects : SCSI things happen, the disconnected queue will be
Finn Thain594d4ba2016-01-03 16:06:10 +11001749 * modified if a command disconnects, *instance->connected will
1750 * change.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001751 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001752 * XXX Note : we need to watch for bus free or a reset condition here
Finn Thain594d4ba2016-01-03 16:06:10 +11001753 * to recover from an unexpected bus free condition.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001754 */
1755
Finn Thain0d2cf862016-01-03 16:06:11 +11001756static void NCR5380_information_transfer(struct Scsi_Host *instance)
1757{
Finn Thaine8a60142016-01-03 16:05:54 +11001758 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001759 unsigned char msgout = NOP;
1760 int sink = 0;
1761 int len;
1762#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
1763 int transfersize;
1764#endif
1765 unsigned char *data;
1766 unsigned char phase, tmp, extended_msg[10], old_phase = 0xff;
Finn Thain11d2f632016-01-03 16:05:51 +11001767 struct scsi_cmnd *cmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001768
Finn Thain11d2f632016-01-03 16:05:51 +11001769 while ((cmd = hostdata->connected)) {
Finn Thain32b26a12016-01-03 16:05:58 +11001770 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
1771
Linus Torvalds1da177e2005-04-16 15:20:36 -07001772 tmp = NCR5380_read(STATUS_REG);
1773 /* We only have a valid SCSI phase when REQ is asserted */
1774 if (tmp & SR_REQ) {
1775 phase = (tmp & PHASE_MASK);
1776 if (phase != old_phase) {
1777 old_phase = phase;
1778 NCR5380_dprint_phase(NDEBUG_INFORMATION, instance);
1779 }
1780 if (sink && (phase != PHASE_MSGOUT)) {
1781 NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp));
1782
Finn Thain3d07d222016-01-03 16:06:13 +11001783 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN |
1784 ICR_ASSERT_ACK);
Finn Thain0d2cf862016-01-03 16:06:11 +11001785 while (NCR5380_read(STATUS_REG) & SR_REQ)
1786 ;
Finn Thain3d07d222016-01-03 16:06:13 +11001787 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE |
1788 ICR_ASSERT_ATN);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001789 sink = 0;
1790 continue;
1791 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001792
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 switch (phase) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001794 case PHASE_DATAOUT:
1795#if (NDEBUG & NDEBUG_NO_DATAOUT)
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001796 shost_printk(KERN_DEBUG, instance, "NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 sink = 1;
1798 do_abort(instance);
1799 cmd->result = DID_ERROR << 16;
Finn Thain677e0192016-01-03 16:05:59 +11001800 complete_cmd(instance, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001801 return;
1802#endif
Finn Thainbf1a0c62016-01-03 16:05:47 +11001803 case PHASE_DATAIN:
Finn Thainaff0cf92016-01-03 16:06:09 +11001804 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805 * If there is no room left in the current buffer in the
1806 * scatter-gather list, move onto the next one.
1807 */
1808
1809 if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) {
1810 ++cmd->SCp.buffer;
1811 --cmd->SCp.buffers_residual;
1812 cmd->SCp.this_residual = cmd->SCp.buffer->length;
Jens Axboe45711f12007-10-22 21:19:53 +02001813 cmd->SCp.ptr = sg_virt(cmd->SCp.buffer);
Finn Thainb7465452016-01-03 16:06:05 +11001814 dsprintk(NDEBUG_INFORMATION, instance, "%d bytes and %d buffers left\n",
1815 cmd->SCp.this_residual,
1816 cmd->SCp.buffers_residual);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 }
Finn Thain0d2cf862016-01-03 16:06:11 +11001818
Linus Torvalds1da177e2005-04-16 15:20:36 -07001819 /*
Finn Thainaff0cf92016-01-03 16:06:09 +11001820 * The preferred transfer method is going to be
Linus Torvalds1da177e2005-04-16 15:20:36 -07001821 * PSEUDO-DMA for systems that are strictly PIO,
1822 * since we can let the hardware do the handshaking.
1823 *
1824 * For this to work, we need to know the transfersize
1825 * ahead of time, since the pseudo-DMA code will sit
1826 * in an unconditional loop.
1827 */
1828
1829#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
Finn Thainff3d4572016-01-03 16:05:25 +11001830 transfersize = 0;
1831 if (!cmd->device->borken &&
1832 !(hostdata->flags & FLAG_NO_PSEUDO_DMA))
1833 transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834
Finn Thainff3d4572016-01-03 16:05:25 +11001835 if (transfersize) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 len = transfersize;
Finn Thain0d2cf862016-01-03 16:06:11 +11001837 if (NCR5380_transfer_dma(instance, &phase,
1838 &len, (unsigned char **)&cmd->SCp.ptr)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839 /*
Finn Thain0d2cf862016-01-03 16:06:11 +11001840 * If the watchdog timer fires, all future
1841 * accesses to this device will use the
1842 * polled-IO.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001843 */
Jeff Garzik017560f2005-10-24 18:04:36 -04001844 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11001845 "switching to slow handshake\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001846 cmd->device->borken = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 sink = 1;
1848 do_abort(instance);
1849 cmd->result = DID_ERROR << 16;
Finn Thain677e0192016-01-03 16:05:59 +11001850 complete_cmd(instance, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001851 /* XXX - need to source or sink data here, as appropriate */
1852 } else
1853 cmd->SCp.this_residual -= transfersize - len;
1854 } else
1855#endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */
Finn Thain11d2f632016-01-03 16:05:51 +11001856 {
1857 spin_unlock_irq(&hostdata->lock);
Finn Thain3d07d222016-01-03 16:06:13 +11001858 NCR5380_transfer_pio(instance, &phase,
1859 (int *)&cmd->SCp.this_residual,
1860 (unsigned char **)&cmd->SCp.ptr);
Finn Thain11d2f632016-01-03 16:05:51 +11001861 spin_lock_irq(&hostdata->lock);
1862 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001863 break;
1864 case PHASE_MSGIN:
1865 len = 1;
1866 data = &tmp;
1867 NCR5380_transfer_pio(instance, &phase, &len, &data);
1868 cmd->SCp.Message = tmp;
1869
1870 switch (tmp) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001871 case ABORT:
1872 case COMMAND_COMPLETE:
1873 /* Accept message by clearing ACK */
1874 sink = 1;
1875 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain0d3d9a42016-01-03 16:05:55 +11001876 dsprintk(NDEBUG_QUEUES, instance,
1877 "COMMAND COMPLETE %p target %d lun %llu\n",
1878 cmd, scmd_id(cmd), cmd->device->lun);
1879
Linus Torvalds1da177e2005-04-16 15:20:36 -07001880 hostdata->connected = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001881
Finn Thainf27db8e2016-01-03 16:06:00 +11001882 cmd->result &= ~0xffff;
1883 cmd->result |= cmd->SCp.Status;
1884 cmd->result |= cmd->SCp.Message << 8;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001885
Finn Thainf27db8e2016-01-03 16:06:00 +11001886 if (cmd->cmnd[0] == REQUEST_SENSE)
Finn Thain677e0192016-01-03 16:05:59 +11001887 complete_cmd(instance, cmd);
Finn Thainf27db8e2016-01-03 16:06:00 +11001888 else {
1889 if (cmd->SCp.Status == SAM_STAT_CHECK_CONDITION ||
1890 cmd->SCp.Status == SAM_STAT_COMMAND_TERMINATED) {
1891 dsprintk(NDEBUG_QUEUES, instance, "autosense: adding cmd %p to tail of autosense queue\n",
1892 cmd);
1893 list_add_tail(&ncmd->list,
1894 &hostdata->autosense);
1895 } else
1896 complete_cmd(instance, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001897 }
1898
Finn Thainaff0cf92016-01-03 16:06:09 +11001899 /*
1900 * Restore phase bits to 0 so an interrupted selection,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 * arbitration can resume.
1902 */
1903 NCR5380_write(TARGET_COMMAND_REG, 0);
Finn Thain72064a72016-01-03 16:05:44 +11001904
1905 /* Enable reselect interrupts */
1906 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001907 return;
1908 case MESSAGE_REJECT:
1909 /* Accept message by clearing ACK */
1910 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1911 switch (hostdata->last_message) {
1912 case HEAD_OF_QUEUE_TAG:
1913 case ORDERED_QUEUE_TAG:
1914 case SIMPLE_QUEUE_TAG:
1915 cmd->device->simple_tags = 0;
Hannes Reinecke9cb78c12014-06-25 15:27:36 +02001916 hostdata->busy[cmd->device->id] |= (1 << (cmd->device->lun & 0xFF));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001917 break;
1918 default:
1919 break;
1920 }
Finn Thain340b9612016-01-03 16:05:31 +11001921 break;
Finn Thain0d2cf862016-01-03 16:06:11 +11001922 case DISCONNECT:
1923 /* Accept message by clearing ACK */
1924 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1925 hostdata->connected = NULL;
1926 list_add(&ncmd->list, &hostdata->disconnected);
1927 dsprintk(NDEBUG_INFORMATION | NDEBUG_QUEUES,
1928 instance, "connected command %p for target %d lun %llu moved to disconnected queue\n",
1929 cmd, scmd_id(cmd), cmd->device->lun);
Finn Thain0d3d9a42016-01-03 16:05:55 +11001930
Finn Thain0d2cf862016-01-03 16:06:11 +11001931 /*
1932 * Restore phase bits to 0 so an interrupted selection,
1933 * arbitration can resume.
1934 */
1935 NCR5380_write(TARGET_COMMAND_REG, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001936
Finn Thain0d2cf862016-01-03 16:06:11 +11001937 /* Enable reselect interrupts */
1938 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
1939 return;
Finn Thainaff0cf92016-01-03 16:06:09 +11001940 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001941 * The SCSI data pointer is *IMPLICITLY* saved on a disconnect
Finn Thainaff0cf92016-01-03 16:06:09 +11001942 * operation, in violation of the SCSI spec so we can safely
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 * ignore SAVE/RESTORE pointers calls.
1944 *
Finn Thainaff0cf92016-01-03 16:06:09 +11001945 * Unfortunately, some disks violate the SCSI spec and
Linus Torvalds1da177e2005-04-16 15:20:36 -07001946 * don't issue the required SAVE_POINTERS message before
Finn Thainaff0cf92016-01-03 16:06:09 +11001947 * disconnecting, and we have to break spec to remain
Linus Torvalds1da177e2005-04-16 15:20:36 -07001948 * compatible.
1949 */
1950 case SAVE_POINTERS:
1951 case RESTORE_POINTERS:
1952 /* Accept message by clearing ACK */
1953 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1954 break;
1955 case EXTENDED_MESSAGE:
Finn Thainc16df322016-01-03 16:06:08 +11001956 /*
1957 * Start the message buffer with the EXTENDED_MESSAGE
1958 * byte, since spi_print_msg() wants the whole thing.
1959 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001960 extended_msg[0] = EXTENDED_MESSAGE;
1961 /* Accept first byte by clearing ACK */
1962 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
Finn Thain11d2f632016-01-03 16:05:51 +11001963
1964 spin_unlock_irq(&hostdata->lock);
1965
Finn Thainb7465452016-01-03 16:06:05 +11001966 dsprintk(NDEBUG_EXTENDED, instance, "receiving extended message\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967
1968 len = 2;
1969 data = extended_msg + 1;
1970 phase = PHASE_MSGIN;
1971 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001972 dsprintk(NDEBUG_EXTENDED, instance, "length %d, code 0x%02x\n",
1973 (int)extended_msg[1],
1974 (int)extended_msg[2]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001975
Finn Thaine0783ed2016-01-03 16:05:45 +11001976 if (!len && extended_msg[1] > 0 &&
1977 extended_msg[1] <= sizeof(extended_msg) - 2) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001978 /* Accept third byte by clearing ACK */
1979 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
1980 len = extended_msg[1] - 1;
1981 data = extended_msg + 3;
1982 phase = PHASE_MSGIN;
1983
1984 NCR5380_transfer_pio(instance, &phase, &len, &data);
Finn Thainb7465452016-01-03 16:06:05 +11001985 dsprintk(NDEBUG_EXTENDED, instance, "message received, residual %d\n",
1986 len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001987
1988 switch (extended_msg[2]) {
1989 case EXTENDED_SDTR:
1990 case EXTENDED_WDTR:
1991 case EXTENDED_MODIFY_DATA_POINTER:
1992 case EXTENDED_EXTENDED_IDENTIFY:
1993 tmp = 0;
1994 }
1995 } else if (len) {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001996 shost_printk(KERN_ERR, instance, "error receiving extended message\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001997 tmp = 0;
1998 } else {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11001999 shost_printk(KERN_NOTICE, instance, "extended message code %02x length %d is too long\n",
2000 extended_msg[2], extended_msg[1]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002001 tmp = 0;
2002 }
Finn Thain11d2f632016-01-03 16:05:51 +11002003
2004 spin_lock_irq(&hostdata->lock);
2005 if (!hostdata->connected)
2006 return;
2007
Linus Torvalds1da177e2005-04-16 15:20:36 -07002008 /* Fall through to reject message */
2009
Finn Thainaff0cf92016-01-03 16:06:09 +11002010 /*
2011 * If we get something weird that we aren't expecting,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002012 * reject it.
2013 */
2014 default:
2015 if (!tmp) {
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002016 shost_printk(KERN_ERR, instance, "rejecting message ");
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002017 spi_print_msg(extended_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018 printk("\n");
2019 } else if (tmp != EXTENDED_MESSAGE)
Jeff Garzik017560f2005-10-24 18:04:36 -04002020 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11002021 "rejecting unknown message %02x\n",
2022 tmp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002023 else
Jeff Garzik017560f2005-10-24 18:04:36 -04002024 scmd_printk(KERN_INFO, cmd,
Finn Thain0d2cf862016-01-03 16:06:11 +11002025 "rejecting unknown extended message code %02x, length %d\n",
2026 extended_msg[1], extended_msg[0]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002027
2028 msgout = MESSAGE_REJECT;
2029 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN);
2030 break;
Finn Thain0d2cf862016-01-03 16:06:11 +11002031 } /* switch (tmp) */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002032 break;
2033 case PHASE_MSGOUT:
2034 len = 1;
2035 data = &msgout;
2036 hostdata->last_message = msgout;
2037 NCR5380_transfer_pio(instance, &phase, &len, &data);
2038 if (msgout == ABORT) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002039 hostdata->connected = NULL;
2040 cmd->result = DID_ERROR << 16;
Finn Thain677e0192016-01-03 16:05:59 +11002041 complete_cmd(instance, cmd);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002042 NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
2043 return;
2044 }
2045 msgout = NOP;
2046 break;
2047 case PHASE_CMDOUT:
2048 len = cmd->cmd_len;
2049 data = cmd->cmnd;
Finn Thainaff0cf92016-01-03 16:06:09 +11002050 /*
2051 * XXX for performance reasons, on machines with a
2052 * PSEUDO-DMA architecture we should probably
2053 * use the dma transfer function.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002054 */
2055 NCR5380_transfer_pio(instance, &phase, &len, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002056 break;
2057 case PHASE_STATIN:
2058 len = 1;
2059 data = &tmp;
2060 NCR5380_transfer_pio(instance, &phase, &len, &data);
2061 cmd->SCp.Status = tmp;
2062 break;
2063 default:
Finn Thain6a6ff4a2016-01-03 16:06:04 +11002064 shost_printk(KERN_ERR, instance, "unknown phase\n");
Finn Thain4dde8f72014-03-18 11:42:17 +11002065 NCR5380_dprint(NDEBUG_ANY, instance);
Finn Thain0d2cf862016-01-03 16:06:11 +11002066 } /* switch(phase) */
Finn Thain686f3992016-01-03 16:05:26 +11002067 } else {
Finn Thain11d2f632016-01-03 16:05:51 +11002068 spin_unlock_irq(&hostdata->lock);
Finn Thain686f3992016-01-03 16:05:26 +11002069 NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ);
Finn Thain11d2f632016-01-03 16:05:51 +11002070 spin_lock_irq(&hostdata->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002071 }
Finn Thain11d2f632016-01-03 16:05:51 +11002072 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002073}
2074
2075/*
2076 * Function : void NCR5380_reselect (struct Scsi_Host *instance)
2077 *
Finn Thainaff0cf92016-01-03 16:06:09 +11002078 * Purpose : does reselection, initializing the instance->connected
Finn Thain594d4ba2016-01-03 16:06:10 +11002079 * field to point to the scsi_cmnd for which the I_T_L or I_T_L_Q
2080 * nexus has been reestablished,
Finn Thainaff0cf92016-01-03 16:06:09 +11002081 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07002082 * Inputs : instance - this instance of the NCR5380.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 */
2084
Finn Thain0d2cf862016-01-03 16:06:11 +11002085static void NCR5380_reselect(struct Scsi_Host *instance)
2086{
Finn Thaine8a60142016-01-03 16:05:54 +11002087 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002088 unsigned char target_mask;
2089 unsigned char lun, phase;
2090 int len;
2091 unsigned char msg[3];
2092 unsigned char *data;
Finn Thain32b26a12016-01-03 16:05:58 +11002093 struct NCR5380_cmd *ncmd;
2094 struct scsi_cmnd *tmp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002095
2096 /*
2097 * Disable arbitration, etc. since the host adapter obviously
2098 * lost, and tell an interrupted NCR5380_select() to restart.
2099 */
2100
2101 NCR5380_write(MODE_REG, MR_BASE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002102
2103 target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask);
Finn Thainb7465452016-01-03 16:06:05 +11002104
2105 dsprintk(NDEBUG_RESELECTION, instance, "reselect\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07002106
Finn Thainaff0cf92016-01-03 16:06:09 +11002107 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 * At this point, we have detected that our SCSI ID is on the bus,
2109 * SEL is true and BSY was false for at least one bus settle delay
2110 * (400 ns).
2111 *
2112 * We must assert BSY ourselves, until the target drops the SEL
2113 * signal.
2114 */
2115
2116 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY);
Finn Thain72064a72016-01-03 16:05:44 +11002117 if (NCR5380_poll_politely(instance,
2118 STATUS_REG, SR_SEL, 0, 2 * HZ) < 0) {
2119 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2120 return;
2121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002122 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2123
2124 /*
2125 * Wait for target to go into MSGIN.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002126 */
2127
Finn Thain1cc160e2016-01-03 16:05:32 +11002128 if (NCR5380_poll_politely(instance,
Finn Thain72064a72016-01-03 16:05:44 +11002129 STATUS_REG, SR_REQ, SR_REQ, 2 * HZ) < 0) {
2130 do_abort(instance);
2131 return;
2132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002133
2134 len = 1;
2135 data = msg;
2136 phase = PHASE_MSGIN;
2137 NCR5380_transfer_pio(instance, &phase, &len, &data);
2138
Finn Thain72064a72016-01-03 16:05:44 +11002139 if (len) {
2140 do_abort(instance);
2141 return;
2142 }
2143
Linus Torvalds1da177e2005-04-16 15:20:36 -07002144 if (!(msg[0] & 0x80)) {
Finn Thain72064a72016-01-03 16:05:44 +11002145 shost_printk(KERN_ERR, instance, "expecting IDENTIFY message, got ");
Matthew Wilcox1abfd372005-12-15 16:22:01 -05002146 spi_print_msg(msg);
Finn Thain72064a72016-01-03 16:05:44 +11002147 printk("\n");
2148 do_abort(instance);
2149 return;
2150 }
2151 lun = msg[0] & 0x07;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002152
Finn Thain72064a72016-01-03 16:05:44 +11002153 /*
2154 * We need to add code for SCSI-II to track which devices have
2155 * I_T_L_Q nexuses established, and which have simple I_T_L
2156 * nexuses so we can chose to do additional data transfer.
2157 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002158
Finn Thain72064a72016-01-03 16:05:44 +11002159 /*
2160 * Find the command corresponding to the I_T_L or I_T_L_Q nexus we
2161 * just reestablished, and remove it from the disconnected queue.
2162 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002163
Finn Thain32b26a12016-01-03 16:05:58 +11002164 tmp = NULL;
2165 list_for_each_entry(ncmd, &hostdata->disconnected, list) {
2166 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2167
2168 if (target_mask == (1 << scmd_id(cmd)) &&
2169 lun == (u8)cmd->device->lun) {
2170 list_del(&ncmd->list);
2171 tmp = cmd;
Finn Thain72064a72016-01-03 16:05:44 +11002172 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002173 }
2174 }
Finn Thain0d3d9a42016-01-03 16:05:55 +11002175
2176 if (tmp) {
2177 dsprintk(NDEBUG_RESELECTION | NDEBUG_QUEUES, instance,
2178 "reselect: removed %p from disconnected queue\n", tmp);
2179 } else {
Finn Thain72064a72016-01-03 16:05:44 +11002180 shost_printk(KERN_ERR, instance, "target bitmask 0x%02x lun %d not in disconnected queue.\n",
2181 target_mask, lun);
2182 /*
Finn Thain0d2cf862016-01-03 16:06:11 +11002183 * Since we have an established nexus that we can't do anything
2184 * with, we must abort it.
Finn Thain72064a72016-01-03 16:05:44 +11002185 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07002186 do_abort(instance);
Finn Thain72064a72016-01-03 16:05:44 +11002187 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002188 }
Finn Thain72064a72016-01-03 16:05:44 +11002189
2190 /* Accept message by clearing ACK */
2191 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2192
2193 hostdata->connected = tmp;
Finn Thainb7465452016-01-03 16:06:05 +11002194 dsprintk(NDEBUG_RESELECTION, instance, "nexus established, target %d, lun %llu, tag %d\n",
2195 scmd_id(tmp), tmp->device->lun, tmp->tag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002196}
2197
2198/*
2199 * Function : void NCR5380_dma_complete (struct Scsi_Host *instance)
2200 *
2201 * Purpose : called by interrupt handler when DMA finishes or a phase
Finn Thain594d4ba2016-01-03 16:06:10 +11002202 * mismatch occurs (which would finish the DMA transfer).
Linus Torvalds1da177e2005-04-16 15:20:36 -07002203 *
2204 * Inputs : instance - this instance of the NCR5380.
2205 *
Finn Thain710ddd02014-11-12 16:12:02 +11002206 * Returns : pointer to the scsi_cmnd structure for which the I_T_L
Finn Thain594d4ba2016-01-03 16:06:10 +11002207 * nexus has been reestablished, on failure NULL is returned.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002208 */
2209
2210#ifdef REAL_DMA
2211static void NCR5380_dma_complete(NCR5380_instance * instance) {
Finn Thaine8a60142016-01-03 16:05:54 +11002212 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002213 int transferred;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214
2215 /*
2216 * XXX this might not be right.
2217 *
2218 * Wait for final byte to transfer, ie wait for ACK to go false.
2219 *
Finn Thainaff0cf92016-01-03 16:06:09 +11002220 * We should use the Last Byte Sent bit, unfortunately this is
Linus Torvalds1da177e2005-04-16 15:20:36 -07002221 * not available on the 5380/5381 (only the various CMOS chips)
2222 *
2223 * FIXME: timeout, and need to handle long timeout/irq case
2224 */
2225
2226 NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ);
2227
Linus Torvalds1da177e2005-04-16 15:20:36 -07002228 NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
2229
2230 /*
2231 * The only places we should see a phase mismatch and have to send
2232 * data from the same set of pointers will be the data transfer
2233 * phases. So, residual, requested length are only important here.
2234 */
2235
2236 if (!(hostdata->connected->SCp.phase & SR_CD)) {
2237 transferred = instance->dmalen - NCR5380_dma_residual();
2238 hostdata->connected->SCp.this_residual -= transferred;
2239 hostdata->connected->SCp.ptr += transferred;
2240 }
2241}
2242#endif /* def REAL_DMA */
2243
Finn Thain8b00c3d2016-01-03 16:06:01 +11002244/**
2245 * list_find_cmd - test for presence of a command in a linked list
2246 * @haystack: list of commands
2247 * @needle: command to search for
2248 */
2249
2250static bool list_find_cmd(struct list_head *haystack,
2251 struct scsi_cmnd *needle)
2252{
2253 struct NCR5380_cmd *ncmd;
2254
2255 list_for_each_entry(ncmd, haystack, list)
2256 if (NCR5380_to_scmd(ncmd) == needle)
2257 return true;
2258 return false;
2259}
2260
2261/**
2262 * list_remove_cmd - remove a command from linked list
2263 * @haystack: list of commands
2264 * @needle: command to remove
2265 */
2266
2267static bool list_del_cmd(struct list_head *haystack,
2268 struct scsi_cmnd *needle)
2269{
2270 if (list_find_cmd(haystack, needle)) {
2271 struct NCR5380_cmd *ncmd = scsi_cmd_priv(needle);
2272
2273 list_del(&ncmd->list);
2274 return true;
2275 }
2276 return false;
2277}
2278
2279/**
2280 * NCR5380_abort - scsi host eh_abort_handler() method
2281 * @cmd: the command to be aborted
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002283 * Try to abort a given command by removing it from queues and/or sending
2284 * the target an abort message. This may not succeed in causing a target
2285 * to abort the command. Nonetheless, the low-level driver must forget about
2286 * the command because the mid-layer reclaims it and it may be re-issued.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002287 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002288 * The normal path taken by a command is as follows. For EH we trace this
2289 * same path to locate and abort the command.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002290 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002291 * unissued -> selecting -> [unissued -> selecting ->]... connected ->
2292 * [disconnected -> connected ->]...
2293 * [autosense -> connected ->] done
Linus Torvalds1da177e2005-04-16 15:20:36 -07002294 *
Finn Thain8b00c3d2016-01-03 16:06:01 +11002295 * If cmd is unissued then just remove it.
2296 * If cmd is disconnected, try to select the target.
2297 * If cmd is connected, try to send an abort message.
2298 * If cmd is waiting for autosense, give it a chance to complete but check
2299 * that it isn't left connected.
2300 * If cmd was not found at all then presumably it has already been completed,
2301 * in which case return SUCCESS to try to avoid further EH measures.
2302 * If the command has not completed yet, we must not fail to find it.
Linus Torvalds1da177e2005-04-16 15:20:36 -07002303 */
2304
Finn Thain710ddd02014-11-12 16:12:02 +11002305static int NCR5380_abort(struct scsi_cmnd *cmd)
2306{
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307 struct Scsi_Host *instance = cmd->device->host;
Finn Thaine8a60142016-01-03 16:05:54 +11002308 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain11d2f632016-01-03 16:05:51 +11002309 unsigned long flags;
Finn Thain8b00c3d2016-01-03 16:06:01 +11002310 int result = SUCCESS;
Hannes Reinecke1fa6b5f2014-10-24 14:26:58 +02002311
Finn Thain11d2f632016-01-03 16:05:51 +11002312 spin_lock_irqsave(&hostdata->lock, flags);
2313
Finn Thain32b26a12016-01-03 16:05:58 +11002314#if (NDEBUG & NDEBUG_ANY)
Finn Thain8b00c3d2016-01-03 16:06:01 +11002315 scmd_printk(KERN_INFO, cmd, __func__);
Finn Thain32b26a12016-01-03 16:05:58 +11002316#endif
Finn Thaine5c3fdd2016-01-03 16:05:52 +11002317 NCR5380_dprint(NDEBUG_ANY, instance);
2318 NCR5380_dprint_phase(NDEBUG_ANY, instance);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002319
Finn Thain8b00c3d2016-01-03 16:06:01 +11002320 if (list_del_cmd(&hostdata->unissued, cmd)) {
2321 dsprintk(NDEBUG_ABORT, instance,
2322 "abort: removed %p from issue queue\n", cmd);
2323 cmd->result = DID_ABORT << 16;
2324 cmd->scsi_done(cmd); /* No tag or busy flag to worry about */
2325 }
2326
Finn Thain707d62b2016-01-03 16:06:02 +11002327 if (hostdata->selecting == cmd) {
2328 dsprintk(NDEBUG_ABORT, instance,
2329 "abort: cmd %p == selecting\n", cmd);
2330 hostdata->selecting = NULL;
2331 cmd->result = DID_ABORT << 16;
2332 complete_cmd(instance, cmd);
2333 goto out;
2334 }
2335
Finn Thain8b00c3d2016-01-03 16:06:01 +11002336 if (list_del_cmd(&hostdata->disconnected, cmd)) {
2337 dsprintk(NDEBUG_ABORT, instance,
2338 "abort: removed %p from disconnected list\n", cmd);
2339 cmd->result = DID_ERROR << 16;
2340 if (!hostdata->connected)
2341 NCR5380_select(instance, cmd);
2342 if (hostdata->connected != cmd) {
2343 complete_cmd(instance, cmd);
2344 result = FAILED;
2345 goto out;
2346 }
2347 }
2348
2349 if (hostdata->connected == cmd) {
2350 dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
2351 hostdata->connected = NULL;
2352 if (do_abort(instance)) {
2353 set_host_byte(cmd, DID_ERROR);
2354 complete_cmd(instance, cmd);
2355 result = FAILED;
2356 goto out;
2357 }
2358 set_host_byte(cmd, DID_ABORT);
2359#ifdef REAL_DMA
2360 hostdata->dma_len = 0;
2361#endif
2362 if (cmd->cmnd[0] == REQUEST_SENSE)
2363 complete_cmd(instance, cmd);
2364 else {
2365 struct NCR5380_cmd *ncmd = scsi_cmd_priv(cmd);
2366
2367 /* Perform autosense for this command */
2368 list_add(&ncmd->list, &hostdata->autosense);
2369 }
2370 }
2371
2372 if (list_find_cmd(&hostdata->autosense, cmd)) {
2373 dsprintk(NDEBUG_ABORT, instance,
2374 "abort: found %p on sense queue\n", cmd);
2375 spin_unlock_irqrestore(&hostdata->lock, flags);
2376 queue_work(hostdata->work_q, &hostdata->main_task);
2377 msleep(1000);
2378 spin_lock_irqsave(&hostdata->lock, flags);
2379 if (list_del_cmd(&hostdata->autosense, cmd)) {
2380 dsprintk(NDEBUG_ABORT, instance,
2381 "abort: removed %p from sense queue\n", cmd);
2382 set_host_byte(cmd, DID_ABORT);
2383 complete_cmd(instance, cmd);
2384 goto out;
2385 }
2386 }
2387
2388 if (hostdata->connected == cmd) {
2389 dsprintk(NDEBUG_ABORT, instance, "abort: cmd %p is connected\n", cmd);
2390 hostdata->connected = NULL;
2391 if (do_abort(instance)) {
2392 set_host_byte(cmd, DID_ERROR);
2393 complete_cmd(instance, cmd);
2394 result = FAILED;
2395 goto out;
2396 }
2397 set_host_byte(cmd, DID_ABORT);
2398#ifdef REAL_DMA
2399 hostdata->dma_len = 0;
2400#endif
2401 complete_cmd(instance, cmd);
2402 }
2403
2404out:
2405 if (result == FAILED)
2406 dsprintk(NDEBUG_ABORT, instance, "abort: failed to abort %p\n", cmd);
2407 else
2408 dsprintk(NDEBUG_ABORT, instance, "abort: successfully aborted %p\n", cmd);
2409
2410 queue_work(hostdata->work_q, &hostdata->main_task);
Finn Thain11d2f632016-01-03 16:05:51 +11002411 spin_unlock_irqrestore(&hostdata->lock, flags);
Finn Thain32b26a12016-01-03 16:05:58 +11002412
Finn Thain8b00c3d2016-01-03 16:06:01 +11002413 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414}
2415
2416
Finn Thain3be1b3e2016-01-03 16:05:12 +11002417/**
2418 * NCR5380_bus_reset - reset the SCSI bus
2419 * @cmd: SCSI command undergoing EH
Linus Torvalds1da177e2005-04-16 15:20:36 -07002420 *
Finn Thain3be1b3e2016-01-03 16:05:12 +11002421 * Returns SUCCESS
Linus Torvalds1da177e2005-04-16 15:20:36 -07002422 */
2423
Finn Thain710ddd02014-11-12 16:12:02 +11002424static int NCR5380_bus_reset(struct scsi_cmnd *cmd)
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002425{
2426 struct Scsi_Host *instance = cmd->device->host;
Finn Thain11d2f632016-01-03 16:05:51 +11002427 struct NCR5380_hostdata *hostdata = shost_priv(instance);
Finn Thain62717f52016-01-03 16:06:03 +11002428 int i;
Finn Thain11d2f632016-01-03 16:05:51 +11002429 unsigned long flags;
Finn Thain62717f52016-01-03 16:06:03 +11002430 struct NCR5380_cmd *ncmd;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002431
Finn Thain11d2f632016-01-03 16:05:51 +11002432 spin_lock_irqsave(&hostdata->lock, flags);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002433
2434#if (NDEBUG & NDEBUG_ANY)
Finn Thain62717f52016-01-03 16:06:03 +11002435 scmd_printk(KERN_INFO, cmd, __func__);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002436#endif
Finn Thaine5c3fdd2016-01-03 16:05:52 +11002437 NCR5380_dprint(NDEBUG_ANY, instance);
2438 NCR5380_dprint_phase(NDEBUG_ANY, instance);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002439
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002440 do_reset(instance);
Finn Thain3be1b3e2016-01-03 16:05:12 +11002441
Finn Thain62717f52016-01-03 16:06:03 +11002442 /* reset NCR registers */
2443 NCR5380_write(MODE_REG, MR_BASE);
2444 NCR5380_write(TARGET_COMMAND_REG, 0);
2445 NCR5380_write(SELECT_ENABLE_REG, 0);
2446
2447 /* After the reset, there are no more connected or disconnected commands
2448 * and no busy units; so clear the low-level status here to avoid
2449 * conflicts when the mid-level code tries to wake up the affected
2450 * commands!
2451 */
2452
2453 hostdata->selecting = NULL;
2454
2455 list_for_each_entry(ncmd, &hostdata->disconnected, list) {
2456 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2457
2458 set_host_byte(cmd, DID_RESET);
2459 cmd->scsi_done(cmd);
2460 }
2461
2462 list_for_each_entry(ncmd, &hostdata->autosense, list) {
2463 struct scsi_cmnd *cmd = NCR5380_to_scmd(ncmd);
2464
2465 set_host_byte(cmd, DID_RESET);
2466 cmd->scsi_done(cmd);
2467 }
2468
2469 if (hostdata->connected) {
2470 set_host_byte(hostdata->connected, DID_RESET);
2471 complete_cmd(instance, hostdata->connected);
2472 hostdata->connected = NULL;
2473 }
2474
2475 if (hostdata->sensing) {
2476 set_host_byte(hostdata->connected, DID_RESET);
2477 complete_cmd(instance, hostdata->sensing);
2478 hostdata->sensing = NULL;
2479 }
2480
2481 for (i = 0; i < 8; ++i)
2482 hostdata->busy[i] = 0;
2483#ifdef REAL_DMA
2484 hostdata->dma_len = 0;
2485#endif
2486
2487 queue_work(hostdata->work_q, &hostdata->main_task);
Finn Thain11d2f632016-01-03 16:05:51 +11002488 spin_unlock_irqrestore(&hostdata->lock, flags);
Jeff Garzik 68b3aa72005-05-28 07:56:31 -04002489
Linus Torvalds1da177e2005-04-16 15:20:36 -07002490 return SUCCESS;
2491}