Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NCR 5380 generic driver routines. These should make it *trivial* |
| 3 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
| 4 | * architecture. |
| 5 | * |
| 6 | * Note that these routines also work with NR53c400 family chips. |
| 7 | * |
| 8 | * Copyright 1993, Drew Eckhardt |
| 9 | * Visionary Computing |
| 10 | * (Unix and Linux consulting and custom programming) |
| 11 | * drew@colorado.edu |
| 12 | * +1 (303) 666-5836 |
| 13 | * |
| 14 | * DISTRIBUTION RELEASE 6. |
| 15 | * |
| 16 | * For more information, please consult |
| 17 | * |
| 18 | * NCR 5380 Family |
| 19 | * SCSI Protocol Controller |
| 20 | * Databook |
| 21 | * |
| 22 | * NCR Microelectronics |
| 23 | * 1635 Aeroplaza Drive |
| 24 | * Colorado Springs, CO 80916 |
| 25 | * 1+ (719) 578-3400 |
| 26 | * 1+ (800) 334-5454 |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * $Log: NCR5380.c,v $ |
| 31 | |
| 32 | * Revision 1.10 1998/9/2 Alan Cox |
| 33 | * (alan@redhat.com) |
| 34 | * Fixed up the timer lockups reported so far. Things still suck. Looking |
| 35 | * forward to 2.3 and per device request queues. Then it'll be possible to |
| 36 | * SMP thread this beast and improve life no end. |
| 37 | |
| 38 | * Revision 1.9 1997/7/27 Ronald van Cuijlenborg |
| 39 | * (ronald.van.cuijlenborg@tip.nl or nutty@dds.nl) |
| 40 | * (hopefully) fixed and enhanced USLEEP |
| 41 | * added support for DTC3181E card (for Mustek scanner) |
| 42 | * |
| 43 | |
| 44 | * Revision 1.8 Ingmar Baumgart |
| 45 | * (ingmar@gonzo.schwaben.de) |
| 46 | * added support for NCR53C400a card |
| 47 | * |
| 48 | |
| 49 | * Revision 1.7 1996/3/2 Ray Van Tassle (rayvt@comm.mot.com) |
| 50 | * added proc_info |
| 51 | * added support needed for DTC 3180/3280 |
| 52 | * fixed a couple of bugs |
| 53 | * |
| 54 | |
| 55 | * Revision 1.5 1994/01/19 09:14:57 drew |
| 56 | * Fixed udelay() hack that was being used on DATAOUT phases |
| 57 | * instead of a proper wait for the final handshake. |
| 58 | * |
| 59 | * Revision 1.4 1994/01/19 06:44:25 drew |
| 60 | * *** empty log message *** |
| 61 | * |
| 62 | * Revision 1.3 1994/01/19 05:24:40 drew |
| 63 | * Added support for TCR LAST_BYTE_SENT bit. |
| 64 | * |
| 65 | * Revision 1.2 1994/01/15 06:14:11 drew |
| 66 | * REAL DMA support, bug fixes. |
| 67 | * |
| 68 | * Revision 1.1 1994/01/15 06:00:54 drew |
| 69 | * Initial revision |
| 70 | * |
| 71 | */ |
| 72 | |
| 73 | /* |
| 74 | * Further development / testing that should be done : |
| 75 | * 1. Cleanup the NCR5380_transfer_dma function and DMA operation complete |
| 76 | * code so that everything does the same thing that's done at the |
| 77 | * end of a pseudo-DMA read operation. |
| 78 | * |
| 79 | * 2. Fix REAL_DMA (interrupt driven, polled works fine) - |
| 80 | * basically, transfer size needs to be reduced by one |
| 81 | * and the last byte read as is done with PSEUDO_DMA. |
| 82 | * |
| 83 | * 4. Test SCSI-II tagged queueing (I have no devices which support |
| 84 | * tagged queueing) |
| 85 | * |
| 86 | * 5. Test linked command handling code after Eric is ready with |
| 87 | * the high level code. |
| 88 | */ |
| db9dff3 | 2005-04-03 14:53:59 -0500 | [diff] [blame] | 89 | #include <scsi/scsi_dbg.h> |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 90 | #include <scsi/scsi_transport_spi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
viro@ZenIV.linux.org.uk | 185a7a1 | 2005-09-07 23:18:24 +0100 | [diff] [blame] | 92 | #ifndef NDEBUG |
| 93 | #define NDEBUG 0 |
| 94 | #endif |
Randy Dunlap | f566a57 | 2005-10-02 17:15:29 -0700 | [diff] [blame] | 95 | #ifndef NDEBUG_ABORT |
viro@ZenIV.linux.org.uk | 185a7a1 | 2005-09-07 23:18:24 +0100 | [diff] [blame] | 96 | #define NDEBUG_ABORT 0 |
| 97 | #endif |
| 98 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #if (NDEBUG & NDEBUG_LISTS) |
| 100 | #define LIST(x,y) {printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); if ((x)==(y)) udelay(5); } |
| 101 | #define REMOVE(w,x,y,z) {printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, (void*)(w), (void*)(x), (void*)(y), (void*)(z)); if ((x)==(y)) udelay(5); } |
| 102 | #else |
| 103 | #define LIST(x,y) |
| 104 | #define REMOVE(w,x,y,z) |
| 105 | #endif |
| 106 | |
| 107 | #ifndef notyet |
| 108 | #undef LINKED |
| 109 | #undef REAL_DMA |
| 110 | #endif |
| 111 | |
| 112 | #ifdef REAL_DMA_POLL |
| 113 | #undef READ_OVERRUNS |
| 114 | #define READ_OVERRUNS |
| 115 | #endif |
| 116 | |
| 117 | #ifdef BOARD_REQUIRES_NO_DELAY |
| 118 | #define io_recovery_delay(x) |
| 119 | #else |
| 120 | #define io_recovery_delay(x) udelay(x) |
| 121 | #endif |
| 122 | |
| 123 | /* |
| 124 | * Design |
| 125 | * |
| 126 | * This is a generic 5380 driver. To use it on a different platform, |
| 127 | * one simply writes appropriate system specific macros (ie, data |
| 128 | * transfer - some PC's will use the I/O bus, 68K's must use |
| 129 | * memory mapped) and drops this file in their 'C' wrapper. |
| 130 | * |
| 131 | * (Note from hch: unfortunately it was not enough for the different |
| 132 | * m68k folks and instead of improving this driver they copied it |
| 133 | * and hacked it up for their needs. As a consequence they lost |
| 134 | * most updates to this driver. Maybe someone will fix all these |
| 135 | * drivers to use a common core one day..) |
| 136 | * |
| 137 | * As far as command queueing, two queues are maintained for |
| 138 | * each 5380 in the system - commands that haven't been issued yet, |
| 139 | * and commands that are currently executing. This means that an |
| 140 | * unlimited number of commands may be queued, letting |
| 141 | * more commands propagate from the higher driver levels giving higher |
| 142 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, |
| 143 | * allowing multiple commands to propagate all the way to a SCSI-II device |
| 144 | * while a command is already executing. |
| 145 | * |
| 146 | * |
| 147 | * Issues specific to the NCR5380 : |
| 148 | * |
| 149 | * When used in a PIO or pseudo-dma mode, the NCR5380 is a braindead |
| 150 | * piece of hardware that requires you to sit in a loop polling for |
| 151 | * the REQ signal as long as you are connected. Some devices are |
| 152 | * brain dead (ie, many TEXEL CD ROM drives) and won't disconnect |
| 153 | * while doing long seek operations. |
| 154 | * |
| 155 | * The workaround for this is to keep track of devices that have |
| 156 | * disconnected. If the device hasn't disconnected, for commands that |
| 157 | * should disconnect, we do something like |
| 158 | * |
| 159 | * while (!REQ is asserted) { sleep for N usecs; poll for M usecs } |
| 160 | * |
| 161 | * Some tweaking of N and M needs to be done. An algorithm based |
| 162 | * on "time to data" would give the best results as long as short time |
| 163 | * to datas (ie, on the same track) were considered, however these |
| 164 | * broken devices are the exception rather than the rule and I'd rather |
| 165 | * spend my time optimizing for the normal case. |
| 166 | * |
| 167 | * Architecture : |
| 168 | * |
| 169 | * At the heart of the design is a coroutine, NCR5380_main, |
| 170 | * which is started from a workqueue for each NCR5380 host in the |
| 171 | * system. It attempts to establish I_T_L or I_T_L_Q nexuses by |
| 172 | * removing the commands from the issue queue and calling |
| 173 | * NCR5380_select() if a nexus is not established. |
| 174 | * |
| 175 | * Once a nexus is established, the NCR5380_information_transfer() |
| 176 | * phase goes through the various phases as instructed by the target. |
| 177 | * if the target goes into MSG IN and sends a DISCONNECT message, |
| 178 | * the command structure is placed into the per instance disconnected |
| 179 | * queue, and NCR5380_main tries to find more work. If the target is |
| 180 | * idle for too long, the system will try to sleep. |
| 181 | * |
| 182 | * If a command has disconnected, eventually an interrupt will trigger, |
| 183 | * calling NCR5380_intr() which will in turn call NCR5380_reselect |
| 184 | * to reestablish a nexus. This will run main if necessary. |
| 185 | * |
| 186 | * On command termination, the done function will be called as |
| 187 | * appropriate. |
| 188 | * |
| 189 | * SCSI pointers are maintained in the SCp field of SCSI command |
| 190 | * structures, being initialized after the command is connected |
| 191 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. |
| 192 | * Note that in violation of the standard, an implicit SAVE POINTERS operation |
| 193 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. |
| 194 | */ |
| 195 | |
| 196 | /* |
| 197 | * Using this file : |
| 198 | * This file a skeleton Linux SCSI driver for the NCR 5380 series |
| 199 | * of chips. To use it, you write an architecture specific functions |
| 200 | * and macros and include this file in your driver. |
| 201 | * |
| 202 | * These macros control options : |
| 203 | * AUTOPROBE_IRQ - if defined, the NCR5380_probe_irq() function will be |
| 204 | * defined. |
| 205 | * |
| 206 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
| 207 | * for commands that return with a CHECK CONDITION status. |
| 208 | * |
| 209 | * DIFFERENTIAL - if defined, NCR53c81 chips will use external differential |
| 210 | * transceivers. |
| 211 | * |
| 212 | * DONT_USE_INTR - if defined, never use interrupts, even if we probe or |
| 213 | * override-configure an IRQ. |
| 214 | * |
| 215 | * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512 |
| 216 | * bytes at a time. Since interrupts are disabled by default during |
| 217 | * these transfers, we might need this to give reasonable interrupt |
| 218 | * service time if the transfer size gets too large. |
| 219 | * |
| 220 | * LINKED - if defined, linked commands are supported. |
| 221 | * |
| 222 | * PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases. |
| 223 | * |
| 224 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
| 225 | * |
| 226 | * REAL_DMA_POLL - if defined, REAL DMA is used but the driver doesn't |
| 227 | * rely on phase mismatch and EOP interrupts to determine end |
| 228 | * of phase. |
| 229 | * |
| 230 | * UNSAFE - leave interrupts enabled during pseudo-DMA transfers. You |
| 231 | * only really want to use this if you're having a problem with |
| 232 | * dropped characters during high speed communications, and even |
| 233 | * then, you're going to be better off twiddling with transfersize |
| 234 | * in the high level code. |
| 235 | * |
| 236 | * Defaults for these will be provided although the user may want to adjust |
| 237 | * these to allocate CPU resources to the SCSI driver or "real" code. |
| 238 | * |
| 239 | * USLEEP_SLEEP - amount of time, in jiffies, to sleep |
| 240 | * |
| 241 | * USLEEP_POLL - amount of time, in jiffies, to poll |
| 242 | * |
| 243 | * These macros MUST be defined : |
| 244 | * NCR5380_local_declare() - declare any local variables needed for your |
| 245 | * transfer routines. |
| 246 | * |
| 247 | * NCR5380_setup(instance) - initialize any local variables needed from a given |
| 248 | * instance of the host adapter for NCR5380_{read,write,pread,pwrite} |
| 249 | * |
| 250 | * NCR5380_read(register) - read from the specified register |
| 251 | * |
| 252 | * NCR5380_write(register, value) - write to the specific register |
| 253 | * |
| 254 | * NCR5380_implementation_fields - additional fields needed for this |
| 255 | * specific implementation of the NCR5380 |
| 256 | * |
| 257 | * Either real DMA *or* pseudo DMA may be implemented |
| 258 | * REAL functions : |
| 259 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
| 260 | * Note that the DMA setup functions should return the number of bytes |
| 261 | * that they were able to program the controller for. |
| 262 | * |
| 263 | * Also note that generic i386/PC versions of these macros are |
| 264 | * available as NCR5380_i386_dma_write_setup, |
| 265 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. |
| 266 | * |
| 267 | * NCR5380_dma_write_setup(instance, src, count) - initialize |
| 268 | * NCR5380_dma_read_setup(instance, dst, count) - initialize |
| 269 | * NCR5380_dma_residual(instance); - residual count |
| 270 | * |
| 271 | * PSEUDO functions : |
| 272 | * NCR5380_pwrite(instance, src, count) |
| 273 | * NCR5380_pread(instance, dst, count); |
| 274 | * |
| 275 | * The generic driver is initialized by calling NCR5380_init(instance), |
| 276 | * after setting the appropriate host specific fields and ID. If the |
| 277 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
| 278 | * possible) function may be used. |
| 279 | */ |
| 280 | |
| 281 | static int do_abort(struct Scsi_Host *host); |
| 282 | static void do_reset(struct Scsi_Host *host); |
| 283 | |
| 284 | /* |
| 285 | * initialize_SCp - init the scsi pointer field |
| 286 | * @cmd: command block to set up |
| 287 | * |
| 288 | * Set up the internal fields in the SCSI command. |
| 289 | */ |
| 290 | |
| 291 | static __inline__ void initialize_SCp(Scsi_Cmnd * cmd) |
| 292 | { |
| 293 | /* |
| 294 | * Initialize the Scsi Pointer field so that all of the commands in the |
| 295 | * various queues are valid. |
| 296 | */ |
| 297 | |
| 298 | if (cmd->use_sg) { |
Christoph Hellwig | 5d5ff44 | 2006-06-03 13:21:13 +0200 | [diff] [blame] | 299 | cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | cmd->SCp.buffers_residual = cmd->use_sg - 1; |
| 301 | cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ |
| 302 | cmd->SCp.buffer->offset; |
| 303 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| 304 | } else { |
| 305 | cmd->SCp.buffer = NULL; |
| 306 | cmd->SCp.buffers_residual = 0; |
| 307 | cmd->SCp.ptr = (char *) cmd->request_buffer; |
| 308 | cmd->SCp.this_residual = cmd->request_bufflen; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /** |
| 313 | * NCR5380_poll_politely - wait for NCR5380 status bits |
| 314 | * @instance: controller to poll |
| 315 | * @reg: 5380 register to poll |
| 316 | * @bit: Bitmask to check |
| 317 | * @val: Value required to exit |
| 318 | * |
| 319 | * Polls the NCR5380 in a reasonably efficient manner waiting for |
| 320 | * an event to occur, after a short quick poll we begin giving the |
| 321 | * CPU back in non IRQ contexts |
| 322 | * |
| 323 | * Returns the value of the register or a negative error code. |
| 324 | */ |
| 325 | |
| 326 | static int NCR5380_poll_politely(struct Scsi_Host *instance, int reg, int bit, int val, int t) |
| 327 | { |
| 328 | NCR5380_local_declare(); |
| 329 | int n = 500; /* At about 8uS a cycle for the cpu access */ |
| 330 | unsigned long end = jiffies + t; |
| 331 | int r; |
| 332 | |
| 333 | NCR5380_setup(instance); |
| 334 | |
| 335 | while( n-- > 0) |
| 336 | { |
| 337 | r = NCR5380_read(reg); |
| 338 | if((r & bit) == val) |
| 339 | return 0; |
| 340 | cpu_relax(); |
| 341 | } |
| 342 | |
| 343 | /* t time yet ? */ |
| 344 | while(time_before(jiffies, end)) |
| 345 | { |
| 346 | r = NCR5380_read(reg); |
| 347 | if((r & bit) == val) |
| 348 | return 0; |
| 349 | if(!in_interrupt()) |
| 350 | yield(); |
| 351 | else |
| 352 | cpu_relax(); |
| 353 | } |
| 354 | return -ETIMEDOUT; |
| 355 | } |
| 356 | |
| 357 | static struct { |
| 358 | unsigned char value; |
| 359 | const char *name; |
| 360 | } phases[] = { |
| 361 | {PHASE_DATAOUT, "DATAOUT"}, |
| 362 | {PHASE_DATAIN, "DATAIN"}, |
| 363 | {PHASE_CMDOUT, "CMDOUT"}, |
| 364 | {PHASE_STATIN, "STATIN"}, |
| 365 | {PHASE_MSGOUT, "MSGOUT"}, |
| 366 | {PHASE_MSGIN, "MSGIN"}, |
| 367 | {PHASE_UNKNOWN, "UNKNOWN"} |
| 368 | }; |
| 369 | |
viro@ZenIV.linux.org.uk | 185a7a1 | 2005-09-07 23:18:24 +0100 | [diff] [blame] | 370 | #if NDEBUG |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | static struct { |
| 372 | unsigned char mask; |
| 373 | const char *name; |
| 374 | } signals[] = { |
| 375 | {SR_DBP, "PARITY"}, |
| 376 | {SR_RST, "RST"}, |
| 377 | {SR_BSY, "BSY"}, |
| 378 | {SR_REQ, "REQ"}, |
| 379 | {SR_MSG, "MSG"}, |
| 380 | {SR_CD, "CD"}, |
| 381 | {SR_IO, "IO"}, |
| 382 | {SR_SEL, "SEL"}, |
| 383 | {0, NULL} |
| 384 | }, |
| 385 | basrs[] = { |
| 386 | {BASR_ATN, "ATN"}, |
| 387 | {BASR_ACK, "ACK"}, |
| 388 | {0, NULL} |
| 389 | }, |
| 390 | icrs[] = { |
| 391 | {ICR_ASSERT_RST, "ASSERT RST"}, |
| 392 | {ICR_ASSERT_ACK, "ASSERT ACK"}, |
| 393 | {ICR_ASSERT_BSY, "ASSERT BSY"}, |
| 394 | {ICR_ASSERT_SEL, "ASSERT SEL"}, |
| 395 | {ICR_ASSERT_ATN, "ASSERT ATN"}, |
| 396 | {ICR_ASSERT_DATA, "ASSERT DATA"}, |
| 397 | {0, NULL} |
| 398 | }, |
| 399 | mrs[] = { |
| 400 | {MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, |
| 401 | {MR_TARGET, "MODE TARGET"}, |
| 402 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, |
| 403 | {MR_ENABLE_PAR_INTR, "MODE PARITY INTR"}, |
| 404 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
| 405 | {MR_DMA_MODE, "MODE DMA"}, |
| 406 | {MR_ARBITRATE, "MODE ARBITRATION"}, |
| 407 | {0, NULL} |
| 408 | }; |
| 409 | |
| 410 | /** |
| 411 | * NCR5380_print - print scsi bus signals |
| 412 | * @instance: adapter state to dump |
| 413 | * |
| 414 | * Print the SCSI bus signals for debugging purposes |
| 415 | * |
| 416 | * Locks: caller holds hostdata lock (not essential) |
| 417 | */ |
| 418 | |
| 419 | static void NCR5380_print(struct Scsi_Host *instance) |
| 420 | { |
| 421 | NCR5380_local_declare(); |
| 422 | unsigned char status, data, basr, mr, icr, i; |
| 423 | NCR5380_setup(instance); |
| 424 | |
| 425 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| 426 | status = NCR5380_read(STATUS_REG); |
| 427 | mr = NCR5380_read(MODE_REG); |
| 428 | icr = NCR5380_read(INITIATOR_COMMAND_REG); |
| 429 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
| 430 | |
| 431 | printk("STATUS_REG: %02x ", status); |
| 432 | for (i = 0; signals[i].mask; ++i) |
| 433 | if (status & signals[i].mask) |
| 434 | printk(",%s", signals[i].name); |
| 435 | printk("\nBASR: %02x ", basr); |
| 436 | for (i = 0; basrs[i].mask; ++i) |
| 437 | if (basr & basrs[i].mask) |
| 438 | printk(",%s", basrs[i].name); |
| 439 | printk("\nICR: %02x ", icr); |
| 440 | for (i = 0; icrs[i].mask; ++i) |
| 441 | if (icr & icrs[i].mask) |
| 442 | printk(",%s", icrs[i].name); |
| 443 | printk("\nMODE: %02x ", mr); |
| 444 | for (i = 0; mrs[i].mask; ++i) |
| 445 | if (mr & mrs[i].mask) |
| 446 | printk(",%s", mrs[i].name); |
| 447 | printk("\n"); |
| 448 | } |
| 449 | |
| 450 | |
| 451 | /* |
| 452 | * NCR5380_print_phase - show SCSI phase |
| 453 | * @instance: adapter to dump |
| 454 | * |
| 455 | * Print the current SCSI phase for debugging purposes |
| 456 | * |
| 457 | * Locks: none |
| 458 | */ |
| 459 | |
| 460 | static void NCR5380_print_phase(struct Scsi_Host *instance) |
| 461 | { |
| 462 | NCR5380_local_declare(); |
| 463 | unsigned char status; |
| 464 | int i; |
| 465 | NCR5380_setup(instance); |
| 466 | |
| 467 | status = NCR5380_read(STATUS_REG); |
| 468 | if (!(status & SR_REQ)) |
| 469 | printk("scsi%d : REQ not asserted, phase unknown.\n", instance->host_no); |
| 470 | else { |
| 471 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && (phases[i].value != (status & PHASE_MASK)); ++i); |
| 472 | printk("scsi%d : phase %s\n", instance->host_no, phases[i].name); |
| 473 | } |
| 474 | } |
| 475 | #endif |
| 476 | |
| 477 | /* |
| 478 | * These need tweaking, and would probably work best as per-device |
| 479 | * flags initialized differently for disk, tape, cd, etc devices. |
| 480 | * People with broken devices are free to experiment as to what gives |
| 481 | * the best results for them. |
| 482 | * |
| 483 | * USLEEP_SLEEP should be a minimum seek time. |
| 484 | * |
| 485 | * USLEEP_POLL should be a maximum rotational latency. |
| 486 | */ |
| 487 | #ifndef USLEEP_SLEEP |
| 488 | /* 20 ms (reasonable hard disk speed) */ |
| 489 | #define USLEEP_SLEEP (20*HZ/1000) |
| 490 | #endif |
| 491 | /* 300 RPM (floppy speed) */ |
| 492 | #ifndef USLEEP_POLL |
| 493 | #define USLEEP_POLL (200*HZ/1000) |
| 494 | #endif |
| 495 | #ifndef USLEEP_WAITLONG |
| 496 | /* RvC: (reasonable time to wait on select error) */ |
| 497 | #define USLEEP_WAITLONG USLEEP_SLEEP |
| 498 | #endif |
| 499 | |
| 500 | /* |
| 501 | * Function : int should_disconnect (unsigned char cmd) |
| 502 | * |
Andreas Mohr | d6e05ed | 2006-06-26 18:35:02 +0200 | [diff] [blame^] | 503 | * Purpose : decide whether a command would normally disconnect or |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | * not, since if it won't disconnect we should go to sleep. |
| 505 | * |
| 506 | * Input : cmd - opcode of SCSI command |
| 507 | * |
| 508 | * Returns : DISCONNECT_LONG if we should disconnect for a really long |
| 509 | * time (ie always, sleep, look for REQ active, sleep), |
| 510 | * DISCONNECT_TIME_TO_DATA if we would only disconnect for a normal |
| 511 | * time-to-data delay, DISCONNECT_NONE if this command would return |
| 512 | * immediately. |
| 513 | * |
| 514 | * Future sleep algorithms based on time to data can exploit |
| 515 | * something like this so they can differentiate between "normal" |
| 516 | * (ie, read, write, seek) and unusual commands (ie, * format). |
| 517 | * |
| 518 | * Note : We don't deal with commands that handle an immediate disconnect, |
| 519 | * |
| 520 | */ |
| 521 | |
| 522 | static int should_disconnect(unsigned char cmd) |
| 523 | { |
| 524 | switch (cmd) { |
| 525 | case READ_6: |
| 526 | case WRITE_6: |
| 527 | case SEEK_6: |
| 528 | case READ_10: |
| 529 | case WRITE_10: |
| 530 | case SEEK_10: |
| 531 | return DISCONNECT_TIME_TO_DATA; |
| 532 | case FORMAT_UNIT: |
| 533 | case SEARCH_HIGH: |
| 534 | case SEARCH_LOW: |
| 535 | case SEARCH_EQUAL: |
| 536 | return DISCONNECT_LONG; |
| 537 | default: |
| 538 | return DISCONNECT_NONE; |
| 539 | } |
| 540 | } |
| 541 | |
| 542 | static void NCR5380_set_timer(struct NCR5380_hostdata *hostdata, unsigned long timeout) |
| 543 | { |
| 544 | hostdata->time_expires = jiffies + timeout; |
| 545 | schedule_delayed_work(&hostdata->coroutine, timeout); |
| 546 | } |
| 547 | |
| 548 | |
| 549 | static int probe_irq __initdata = 0; |
| 550 | |
| 551 | /** |
| 552 | * probe_intr - helper for IRQ autoprobe |
| 553 | * @irq: interrupt number |
| 554 | * @dev_id: unused |
| 555 | * @regs: unused |
| 556 | * |
| 557 | * Set a flag to indicate the IRQ in question was received. This is |
| 558 | * used by the IRQ probe code. |
| 559 | */ |
| 560 | |
| 561 | static irqreturn_t __init probe_intr(int irq, void *dev_id, |
| 562 | struct pt_regs *regs) |
| 563 | { |
| 564 | probe_irq = irq; |
| 565 | return IRQ_HANDLED; |
| 566 | } |
| 567 | |
| 568 | /** |
| 569 | * NCR5380_probe_irq - find the IRQ of an NCR5380 |
| 570 | * @instance: NCR5380 controller |
| 571 | * @possible: bitmask of ISA IRQ lines |
| 572 | * |
| 573 | * Autoprobe for the IRQ line used by the NCR5380 by triggering an IRQ |
| 574 | * and then looking to see what interrupt actually turned up. |
| 575 | * |
| 576 | * Locks: none, irqs must be enabled on entry |
| 577 | */ |
| 578 | |
| 579 | static int __init NCR5380_probe_irq(struct Scsi_Host *instance, int possible) |
| 580 | { |
| 581 | NCR5380_local_declare(); |
| 582 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 583 | unsigned long timeout; |
| 584 | int trying_irqs, i, mask; |
| 585 | NCR5380_setup(instance); |
| 586 | |
| 587 | for (trying_irqs = i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
| 588 | if ((mask & possible) && (request_irq(i, &probe_intr, SA_INTERRUPT, "NCR-probe", NULL) == 0)) |
| 589 | trying_irqs |= mask; |
| 590 | |
| 591 | timeout = jiffies + (250 * HZ / 1000); |
| 592 | probe_irq = SCSI_IRQ_NONE; |
| 593 | |
| 594 | /* |
| 595 | * A interrupt is triggered whenever BSY = false, SEL = true |
| 596 | * and a bit set in the SELECT_ENABLE_REG is asserted on the |
| 597 | * SCSI bus. |
| 598 | * |
| 599 | * Note that the bus is only driven when the phase control signals |
| 600 | * (I/O, C/D, and MSG) match those in the TCR, so we must reset that |
| 601 | * to zero. |
| 602 | */ |
| 603 | |
| 604 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 605 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 606 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| 607 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL); |
| 608 | |
| 609 | while (probe_irq == SCSI_IRQ_NONE && time_before(jiffies, timeout)) |
Nishanth Aravamudan | a9a3047 | 2005-11-07 01:01:20 -0800 | [diff] [blame] | 610 | schedule_timeout_uninterruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | NCR5380_write(SELECT_ENABLE_REG, 0); |
| 613 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 614 | |
| 615 | for (i = 0, mask = 1; i < 16; ++i, mask <<= 1) |
| 616 | if (trying_irqs & mask) |
| 617 | free_irq(i, NULL); |
| 618 | |
| 619 | return probe_irq; |
| 620 | } |
| 621 | |
| 622 | /** |
| 623 | * NCR58380_print_options - show options |
| 624 | * @instance: unused for now |
| 625 | * |
| 626 | * Called by probe code indicating the NCR5380 driver options that |
| 627 | * were selected. At some point this will switch to runtime options |
| 628 | * read from the adapter in question |
| 629 | * |
| 630 | * Locks: none |
| 631 | */ |
| 632 | |
| 633 | static void __init NCR5380_print_options(struct Scsi_Host *instance) |
| 634 | { |
| 635 | printk(" generic options" |
| 636 | #ifdef AUTOPROBE_IRQ |
| 637 | " AUTOPROBE_IRQ" |
| 638 | #endif |
| 639 | #ifdef AUTOSENSE |
| 640 | " AUTOSENSE" |
| 641 | #endif |
| 642 | #ifdef DIFFERENTIAL |
| 643 | " DIFFERENTIAL" |
| 644 | #endif |
| 645 | #ifdef REAL_DMA |
| 646 | " REAL DMA" |
| 647 | #endif |
| 648 | #ifdef REAL_DMA_POLL |
| 649 | " REAL DMA POLL" |
| 650 | #endif |
| 651 | #ifdef PARITY |
| 652 | " PARITY" |
| 653 | #endif |
| 654 | #ifdef PSEUDO_DMA |
| 655 | " PSEUDO DMA" |
| 656 | #endif |
| 657 | #ifdef UNSAFE |
| 658 | " UNSAFE " |
| 659 | #endif |
| 660 | ); |
| 661 | printk(" USLEEP, USLEEP_POLL=%d USLEEP_SLEEP=%d", USLEEP_POLL, USLEEP_SLEEP); |
| 662 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); |
| 663 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) { |
| 664 | printk(" ncr53c400 release=%d", NCR53C400_PUBLIC_RELEASE); |
| 665 | } |
| 666 | } |
| 667 | |
| 668 | /** |
| 669 | * NCR5380_print_status - dump controller info |
| 670 | * @instance: controller to dump |
| 671 | * |
| 672 | * Print commands in the various queues, called from NCR5380_abort |
| 673 | * and NCR5380_debug to aid debugging. |
| 674 | * |
| 675 | * Locks: called functions disable irqs |
| 676 | */ |
| 677 | |
| 678 | static void NCR5380_print_status(struct Scsi_Host *instance) |
| 679 | { |
| 680 | NCR5380_dprint(NDEBUG_ANY, instance); |
| 681 | NCR5380_dprint_phase(NDEBUG_ANY, instance); |
| 682 | } |
| 683 | |
| 684 | /******************************************/ |
| 685 | /* |
| 686 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] |
| 687 | * |
| 688 | * *buffer: I/O buffer |
| 689 | * **start: if inout == FALSE pointer into buffer where user read should start |
| 690 | * offset: current offset |
| 691 | * length: length of buffer |
| 692 | * hostno: Scsi_Host host_no |
| 693 | * inout: TRUE - user is writing; FALSE - user is reading |
| 694 | * |
| 695 | * Return the number of bytes read from or written |
| 696 | */ |
| 697 | |
| 698 | #undef SPRINTF |
| 699 | #define SPRINTF(args...) do { if(pos < buffer + length-80) pos += sprintf(pos, ## args); } while(0) |
| 700 | static |
| 701 | char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length); |
| 702 | static |
| 703 | char *lprint_command(unsigned char *cmd, char *pos, char *buffer, int len); |
| 704 | static |
| 705 | char *lprint_opcode(int opcode, char *pos, char *buffer, int length); |
| 706 | |
| 707 | static |
| 708 | int NCR5380_proc_info(struct Scsi_Host *instance, char *buffer, char **start, off_t offset, int length, int inout) |
| 709 | { |
| 710 | char *pos = buffer; |
| 711 | struct NCR5380_hostdata *hostdata; |
| 712 | Scsi_Cmnd *ptr; |
| 713 | |
| 714 | hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 715 | |
| 716 | if (inout) { /* Has data been written to the file ? */ |
| 717 | #ifdef DTC_PUBLIC_RELEASE |
| 718 | dtc_wmaxi = dtc_maxi = 0; |
| 719 | #endif |
| 720 | #ifdef PAS16_PUBLIC_RELEASE |
| 721 | pas_wmaxi = pas_maxi = 0; |
| 722 | #endif |
| 723 | return (-ENOSYS); /* Currently this is a no-op */ |
| 724 | } |
| 725 | SPRINTF("NCR5380 core release=%d. ", NCR5380_PUBLIC_RELEASE); |
| 726 | if (((struct NCR5380_hostdata *) instance->hostdata)->flags & FLAG_NCR53C400) |
| 727 | SPRINTF("ncr53c400 release=%d. ", NCR53C400_PUBLIC_RELEASE); |
| 728 | #ifdef DTC_PUBLIC_RELEASE |
| 729 | SPRINTF("DTC 3180/3280 release %d", DTC_PUBLIC_RELEASE); |
| 730 | #endif |
| 731 | #ifdef T128_PUBLIC_RELEASE |
| 732 | SPRINTF("T128 release %d", T128_PUBLIC_RELEASE); |
| 733 | #endif |
| 734 | #ifdef GENERIC_NCR5380_PUBLIC_RELEASE |
| 735 | SPRINTF("Generic5380 release %d", GENERIC_NCR5380_PUBLIC_RELEASE); |
| 736 | #endif |
| 737 | #ifdef PAS16_PUBLIC_RELEASE |
| 738 | SPRINTF("PAS16 release=%d", PAS16_PUBLIC_RELEASE); |
| 739 | #endif |
| 740 | |
| 741 | SPRINTF("\nBase Addr: 0x%05lX ", (long) instance->base); |
| 742 | SPRINTF("io_port: %04x ", (int) instance->io_port); |
| 743 | if (instance->irq == SCSI_IRQ_NONE) |
| 744 | SPRINTF("IRQ: None.\n"); |
| 745 | else |
| 746 | SPRINTF("IRQ: %d.\n", instance->irq); |
| 747 | |
| 748 | #ifdef DTC_PUBLIC_RELEASE |
| 749 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", dtc_wmaxi, dtc_maxi); |
| 750 | #endif |
| 751 | #ifdef PAS16_PUBLIC_RELEASE |
| 752 | SPRINTF("Highwater I/O busy_spin_counts -- write: %d read: %d\n", pas_wmaxi, pas_maxi); |
| 753 | #endif |
| 754 | spin_lock_irq(instance->host_lock); |
| 755 | if (!hostdata->connected) |
| 756 | SPRINTF("scsi%d: no currently connected command\n", instance->host_no); |
| 757 | else |
| 758 | pos = lprint_Scsi_Cmnd((Scsi_Cmnd *) hostdata->connected, pos, buffer, length); |
| 759 | SPRINTF("scsi%d: issue_queue\n", instance->host_no); |
| 760 | for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
| 761 | pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| 762 | |
| 763 | SPRINTF("scsi%d: disconnected_queue\n", instance->host_no); |
| 764 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; ptr = (Scsi_Cmnd *) ptr->host_scribble) |
| 765 | pos = lprint_Scsi_Cmnd(ptr, pos, buffer, length); |
| 766 | spin_unlock_irq(instance->host_lock); |
| 767 | |
| 768 | *start = buffer; |
| 769 | if (pos - buffer < offset) |
| 770 | return 0; |
| 771 | else if (pos - buffer - offset < length) |
| 772 | return pos - buffer - offset; |
| 773 | return length; |
| 774 | } |
| 775 | |
| 776 | static char *lprint_Scsi_Cmnd(Scsi_Cmnd * cmd, char *pos, char *buffer, int length) |
| 777 | { |
| 778 | SPRINTF("scsi%d : destination target %d, lun %d\n", cmd->device->host->host_no, cmd->device->id, cmd->device->lun); |
| 779 | SPRINTF(" command = "); |
| 780 | pos = lprint_command(cmd->cmnd, pos, buffer, length); |
| 781 | return (pos); |
| 782 | } |
| 783 | |
| 784 | static char *lprint_command(unsigned char *command, char *pos, char *buffer, int length) |
| 785 | { |
| 786 | int i, s; |
| 787 | pos = lprint_opcode(command[0], pos, buffer, length); |
| 788 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
| 789 | SPRINTF("%02x ", command[i]); |
| 790 | SPRINTF("\n"); |
| 791 | return (pos); |
| 792 | } |
| 793 | |
| 794 | static char *lprint_opcode(int opcode, char *pos, char *buffer, int length) |
| 795 | { |
| 796 | SPRINTF("%2d (0x%02x)", opcode, opcode); |
| 797 | return (pos); |
| 798 | } |
| 799 | |
| 800 | |
| 801 | /** |
| 802 | * NCR5380_init - initialise an NCR5380 |
| 803 | * @instance: adapter to configure |
| 804 | * @flags: control flags |
| 805 | * |
| 806 | * Initializes *instance and corresponding 5380 chip, |
| 807 | * with flags OR'd into the initial flags value. |
| 808 | * |
| 809 | * Notes : I assume that the host, hostno, and id bits have been |
| 810 | * set correctly. I don't care about the irq and other fields. |
| 811 | * |
| 812 | * Returns 0 for success |
| 813 | * |
| 814 | * Locks: interrupts must be enabled when we are called |
| 815 | */ |
| 816 | |
| 817 | static int __devinit NCR5380_init(struct Scsi_Host *instance, int flags) |
| 818 | { |
| 819 | NCR5380_local_declare(); |
| 820 | int i, pass; |
| 821 | unsigned long timeout; |
| 822 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 823 | |
| 824 | if(in_interrupt()) |
| 825 | printk(KERN_ERR "NCR5380_init called with interrupts off!\n"); |
| 826 | /* |
| 827 | * On NCR53C400 boards, NCR5380 registers are mapped 8 past |
| 828 | * the base address. |
| 829 | */ |
| 830 | |
| 831 | #ifdef NCR53C400 |
| 832 | if (flags & FLAG_NCR53C400) |
| 833 | instance->NCR5380_instance_name += NCR53C400_address_adjust; |
| 834 | #endif |
| 835 | |
| 836 | NCR5380_setup(instance); |
| 837 | |
| 838 | hostdata->aborted = 0; |
| 839 | hostdata->id_mask = 1 << instance->this_id; |
| 840 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
| 841 | if (i > hostdata->id_mask) |
| 842 | hostdata->id_higher_mask |= i; |
| 843 | for (i = 0; i < 8; ++i) |
| 844 | hostdata->busy[i] = 0; |
| 845 | #ifdef REAL_DMA |
| 846 | hostdata->dmalen = 0; |
| 847 | #endif |
| 848 | hostdata->targets_present = 0; |
| 849 | hostdata->connected = NULL; |
| 850 | hostdata->issue_queue = NULL; |
| 851 | hostdata->disconnected_queue = NULL; |
| 852 | |
| 853 | INIT_WORK(&hostdata->coroutine, NCR5380_main, hostdata); |
| 854 | |
| 855 | #ifdef NCR5380_STATS |
| 856 | for (i = 0; i < 8; ++i) { |
| 857 | hostdata->time_read[i] = 0; |
| 858 | hostdata->time_write[i] = 0; |
| 859 | hostdata->bytes_read[i] = 0; |
| 860 | hostdata->bytes_write[i] = 0; |
| 861 | } |
| 862 | hostdata->timebase = 0; |
| 863 | hostdata->pendingw = 0; |
| 864 | hostdata->pendingr = 0; |
| 865 | #endif |
| 866 | |
| 867 | /* The CHECK code seems to break the 53C400. Will check it later maybe */ |
| 868 | if (flags & FLAG_NCR53C400) |
| 869 | hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags; |
| 870 | else |
| 871 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags; |
| 872 | |
| 873 | hostdata->host = instance; |
| 874 | hostdata->time_expires = 0; |
| 875 | |
| 876 | #ifndef AUTOSENSE |
| 877 | if ((instance->cmd_per_lun > 1) || instance->can_queue > 1) |
| 878 | printk(KERN_WARNING "scsi%d : WARNING : support for multiple outstanding commands enabled\n" " without AUTOSENSE option, contingent allegiance conditions may\n" |
| 879 | " be incorrectly cleared.\n", instance->host_no); |
| 880 | #endif /* def AUTOSENSE */ |
| 881 | |
| 882 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 883 | NCR5380_write(MODE_REG, MR_BASE); |
| 884 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 885 | NCR5380_write(SELECT_ENABLE_REG, 0); |
| 886 | |
| 887 | #ifdef NCR53C400 |
| 888 | if (hostdata->flags & FLAG_NCR53C400) { |
| 889 | NCR5380_write(C400_CONTROL_STATUS_REG, CSR_BASE); |
| 890 | } |
| 891 | #endif |
| 892 | |
| 893 | /* |
| 894 | * Detect and correct bus wedge problems. |
| 895 | * |
| 896 | * If the system crashed, it may have crashed in a state |
| 897 | * where a SCSI command was still executing, and the |
| 898 | * SCSI bus is not in a BUS FREE STATE. |
| 899 | * |
| 900 | * If this is the case, we'll try to abort the currently |
| 901 | * established nexus which we know nothing about, and that |
| 902 | * failing, do a hard reset of the SCSI bus |
| 903 | */ |
| 904 | |
| 905 | for (pass = 1; (NCR5380_read(STATUS_REG) & SR_BSY) && pass <= 6; ++pass) { |
| 906 | switch (pass) { |
| 907 | case 1: |
| 908 | case 3: |
| 909 | case 5: |
| 910 | printk(KERN_INFO "scsi%d: SCSI bus busy, waiting up to five seconds\n", instance->host_no); |
| 911 | timeout = jiffies + 5 * HZ; |
| 912 | NCR5380_poll_politely(instance, STATUS_REG, SR_BSY, 0, 5*HZ); |
| 913 | break; |
| 914 | case 2: |
| 915 | printk(KERN_WARNING "scsi%d: bus busy, attempting abort\n", instance->host_no); |
| 916 | do_abort(instance); |
| 917 | break; |
| 918 | case 4: |
| 919 | printk(KERN_WARNING "scsi%d: bus busy, attempting reset\n", instance->host_no); |
| 920 | do_reset(instance); |
| 921 | break; |
| 922 | case 6: |
| 923 | printk(KERN_ERR "scsi%d: bus locked solid or invalid override\n", instance->host_no); |
| 924 | return -ENXIO; |
| 925 | } |
| 926 | } |
| 927 | return 0; |
| 928 | } |
| 929 | |
| 930 | /** |
| 931 | * NCR5380_exit - remove an NCR5380 |
| 932 | * @instance: adapter to remove |
| 933 | */ |
| 934 | |
| 935 | static void __devexit NCR5380_exit(struct Scsi_Host *instance) |
| 936 | { |
| 937 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 938 | |
| 939 | cancel_delayed_work(&hostdata->coroutine); |
| 940 | flush_scheduled_work(); |
| 941 | } |
| 942 | |
| 943 | /** |
| 944 | * NCR5380_queue_command - queue a command |
| 945 | * @cmd: SCSI command |
| 946 | * @done: completion handler |
| 947 | * |
| 948 | * cmd is added to the per instance issue_queue, with minor |
| 949 | * twiddling done to the host specific fields of cmd. If the |
| 950 | * main coroutine is not running, it is restarted. |
| 951 | * |
| 952 | * Locks: host lock taken by caller |
| 953 | */ |
| 954 | |
| 955 | static int NCR5380_queue_command(Scsi_Cmnd * cmd, void (*done) (Scsi_Cmnd *)) |
| 956 | { |
| 957 | struct Scsi_Host *instance = cmd->device->host; |
| 958 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 959 | Scsi_Cmnd *tmp; |
| 960 | |
| 961 | #if (NDEBUG & NDEBUG_NO_WRITE) |
| 962 | switch (cmd->cmnd[0]) { |
| 963 | case WRITE_6: |
| 964 | case WRITE_10: |
| 965 | printk("scsi%d : WRITE attempted with NO_WRITE debugging flag set\n", instance->host_no); |
| 966 | cmd->result = (DID_ERROR << 16); |
| 967 | done(cmd); |
| 968 | return 0; |
| 969 | } |
| 970 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
| 971 | |
| 972 | #ifdef NCR5380_STATS |
| 973 | switch (cmd->cmnd[0]) { |
| 974 | case WRITE: |
| 975 | case WRITE_6: |
| 976 | case WRITE_10: |
| 977 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); |
| 978 | hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; |
| 979 | hostdata->pendingw++; |
| 980 | break; |
| 981 | case READ: |
| 982 | case READ_6: |
| 983 | case READ_10: |
| 984 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); |
| 985 | hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; |
| 986 | hostdata->pendingr++; |
| 987 | break; |
| 988 | } |
| 989 | #endif |
| 990 | |
| 991 | /* |
| 992 | * We use the host_scribble field as a pointer to the next command |
| 993 | * in a queue |
| 994 | */ |
| 995 | |
| 996 | cmd->host_scribble = NULL; |
| 997 | cmd->scsi_done = done; |
| 998 | cmd->result = 0; |
| 999 | |
| 1000 | /* |
| 1001 | * Insert the cmd into the issue queue. Note that REQUEST SENSE |
| 1002 | * commands are added to the head of the queue since any command will |
| 1003 | * clear the contingent allegiance condition that exists and the |
| 1004 | * sense data is only guaranteed to be valid while the condition exists. |
| 1005 | */ |
| 1006 | |
| 1007 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
| 1008 | LIST(cmd, hostdata->issue_queue); |
| 1009 | cmd->host_scribble = (unsigned char *) hostdata->issue_queue; |
| 1010 | hostdata->issue_queue = cmd; |
| 1011 | } else { |
| 1012 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp->host_scribble; tmp = (Scsi_Cmnd *) tmp->host_scribble); |
| 1013 | LIST(cmd, tmp); |
| 1014 | tmp->host_scribble = (unsigned char *) cmd; |
| 1015 | } |
| 1016 | dprintk(NDEBUG_QUEUES, ("scsi%d : command added to %s of queue\n", instance->host_no, (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail")); |
| 1017 | |
| 1018 | /* Run the coroutine if it isn't already running. */ |
| 1019 | /* Kick off command processing */ |
| 1020 | schedule_work(&hostdata->coroutine); |
| 1021 | return 0; |
| 1022 | } |
| 1023 | |
| 1024 | |
| 1025 | /** |
| 1026 | * NCR5380_main - NCR state machines |
| 1027 | * |
| 1028 | * NCR5380_main is a coroutine that runs as long as more work can |
| 1029 | * be done on the NCR5380 host adapters in a system. Both |
| 1030 | * NCR5380_queue_command() and NCR5380_intr() will try to start it |
| 1031 | * in case it is not running. |
| 1032 | * |
| 1033 | * Locks: called as its own thread with no locks held. Takes the |
| 1034 | * host lock and called routines may take the isa dma lock. |
| 1035 | */ |
| 1036 | |
| 1037 | static void NCR5380_main(void *p) |
| 1038 | { |
| 1039 | struct NCR5380_hostdata *hostdata = p; |
| 1040 | struct Scsi_Host *instance = hostdata->host; |
| 1041 | Scsi_Cmnd *tmp, *prev; |
| 1042 | int done; |
| 1043 | |
| 1044 | spin_lock_irq(instance->host_lock); |
| 1045 | do { |
| 1046 | /* Lock held here */ |
| 1047 | done = 1; |
| 1048 | if (!hostdata->connected && !hostdata->selecting) { |
| 1049 | dprintk(NDEBUG_MAIN, ("scsi%d : not connected\n", instance->host_no)); |
| 1050 | /* |
| 1051 | * Search through the issue_queue for a command destined |
| 1052 | * for a target that's not busy. |
| 1053 | */ |
| 1054 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| 1055 | { |
| 1056 | if (prev != tmp) |
| 1057 | dprintk(NDEBUG_LISTS, ("MAIN tmp=%p target=%d busy=%d lun=%d\n", tmp, tmp->target, hostdata->busy[tmp->target], tmp->lun)); |
| 1058 | /* When we find one, remove it from the issue queue. */ |
| 1059 | if (!(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun))) { |
| 1060 | if (prev) { |
| 1061 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
| 1062 | prev->host_scribble = tmp->host_scribble; |
| 1063 | } else { |
| 1064 | REMOVE(-1, hostdata->issue_queue, tmp, tmp->host_scribble); |
| 1065 | hostdata->issue_queue = (Scsi_Cmnd *) tmp->host_scribble; |
| 1066 | } |
| 1067 | tmp->host_scribble = NULL; |
| 1068 | |
| 1069 | /* |
| 1070 | * Attempt to establish an I_T_L nexus here. |
| 1071 | * On success, instance->hostdata->connected is set. |
| 1072 | * On failure, we must add the command back to the |
| 1073 | * issue queue so we can keep trying. |
| 1074 | */ |
| 1075 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main() : command for target %d lun %d removed from issue_queue\n", instance->host_no, tmp->target, tmp->lun)); |
| 1076 | |
| 1077 | /* |
| 1078 | * A successful selection is defined as one that |
| 1079 | * leaves us with the command connected and |
| 1080 | * in hostdata->connected, OR has terminated the |
| 1081 | * command. |
| 1082 | * |
| 1083 | * With successful commands, we fall through |
| 1084 | * and see if we can do an information transfer, |
| 1085 | * with failures we will restart. |
| 1086 | */ |
| 1087 | hostdata->selecting = NULL; |
| 1088 | /* RvC: have to preset this to indicate a new command is being performed */ |
| 1089 | |
| 1090 | if (!NCR5380_select(instance, tmp, |
| 1091 | /* |
| 1092 | * REQUEST SENSE commands are issued without tagged |
| 1093 | * queueing, even on SCSI-II devices because the |
| 1094 | * contingent allegiance condition exists for the |
| 1095 | * entire unit. |
| 1096 | */ |
| 1097 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
| 1098 | break; |
| 1099 | } else { |
| 1100 | LIST(tmp, hostdata->issue_queue); |
| 1101 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
| 1102 | hostdata->issue_queue = tmp; |
| 1103 | done = 0; |
| 1104 | dprintk(NDEBUG_MAIN|NDEBUG_QUEUES, ("scsi%d : main(): select() failed, returned to issue_queue\n", instance->host_no)); |
| 1105 | } |
| 1106 | /* lock held here still */ |
| 1107 | } /* if target/lun is not busy */ |
| 1108 | } /* for */ |
| 1109 | /* exited locked */ |
| 1110 | } /* if (!hostdata->connected) */ |
| 1111 | if (hostdata->selecting) { |
| 1112 | tmp = (Scsi_Cmnd *) hostdata->selecting; |
| 1113 | /* Selection will drop and retake the lock */ |
| 1114 | if (!NCR5380_select(instance, tmp, (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : TAG_NEXT)) { |
| 1115 | /* Ok ?? */ |
| 1116 | } else { |
| 1117 | /* RvC: device failed, so we wait a long time |
| 1118 | this is needed for Mustek scanners, that |
| 1119 | do not respond to commands immediately |
| 1120 | after a scan */ |
| 1121 | printk(KERN_DEBUG "scsi%d: device %d did not respond in time\n", instance->host_no, tmp->device->id); |
| 1122 | LIST(tmp, hostdata->issue_queue); |
| 1123 | tmp->host_scribble = (unsigned char *) hostdata->issue_queue; |
| 1124 | hostdata->issue_queue = tmp; |
| 1125 | NCR5380_set_timer(hostdata, USLEEP_WAITLONG); |
| 1126 | } |
| 1127 | } /* if hostdata->selecting */ |
| 1128 | if (hostdata->connected |
| 1129 | #ifdef REAL_DMA |
| 1130 | && !hostdata->dmalen |
| 1131 | #endif |
| 1132 | && (!hostdata->time_expires || time_before_eq(hostdata->time_expires, jiffies)) |
| 1133 | ) { |
| 1134 | dprintk(NDEBUG_MAIN, ("scsi%d : main() : performing information transfer\n", instance->host_no)); |
| 1135 | NCR5380_information_transfer(instance); |
| 1136 | dprintk(NDEBUG_MAIN, ("scsi%d : main() : done set false\n", instance->host_no)); |
| 1137 | done = 0; |
| 1138 | } else |
| 1139 | break; |
| 1140 | } while (!done); |
| 1141 | |
| 1142 | spin_unlock_irq(instance->host_lock); |
| 1143 | } |
| 1144 | |
| 1145 | #ifndef DONT_USE_INTR |
| 1146 | |
| 1147 | /** |
| 1148 | * NCR5380_intr - generic NCR5380 irq handler |
| 1149 | * @irq: interrupt number |
| 1150 | * @dev_id: device info |
| 1151 | * @regs: registers (unused) |
| 1152 | * |
| 1153 | * Handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
| 1154 | * from the disconnected queue, and restarting NCR5380_main() |
| 1155 | * as required. |
| 1156 | * |
| 1157 | * Locks: takes the needed instance locks |
| 1158 | */ |
| 1159 | |
| 1160 | static irqreturn_t NCR5380_intr(int irq, void *dev_id, struct pt_regs *regs) |
| 1161 | { |
| 1162 | NCR5380_local_declare(); |
| 1163 | struct Scsi_Host *instance = (struct Scsi_Host *)dev_id; |
| 1164 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 1165 | int done; |
| 1166 | unsigned char basr; |
| 1167 | unsigned long flags; |
| 1168 | |
| 1169 | dprintk(NDEBUG_INTR, ("scsi : NCR5380 irq %d triggered\n", irq)); |
| 1170 | |
| 1171 | do { |
| 1172 | done = 1; |
| 1173 | spin_lock_irqsave(instance->host_lock, flags); |
| 1174 | /* Look for pending interrupts */ |
| 1175 | NCR5380_setup(instance); |
| 1176 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
| 1177 | /* XXX dispatch to appropriate routine if found and done=0 */ |
| 1178 | if (basr & BASR_IRQ) { |
| 1179 | NCR5380_dprint(NDEBUG_INTR, instance); |
| 1180 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
| 1181 | done = 0; |
| 1182 | dprintk(NDEBUG_INTR, ("scsi%d : SEL interrupt\n", instance->host_no)); |
| 1183 | NCR5380_reselect(instance); |
| 1184 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1185 | } else if (basr & BASR_PARITY_ERROR) { |
| 1186 | dprintk(NDEBUG_INTR, ("scsi%d : PARITY interrupt\n", instance->host_no)); |
| 1187 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1188 | } else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { |
| 1189 | dprintk(NDEBUG_INTR, ("scsi%d : RESET interrupt\n", instance->host_no)); |
| 1190 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1191 | } else { |
| 1192 | #if defined(REAL_DMA) |
| 1193 | /* |
| 1194 | * We should only get PHASE MISMATCH and EOP interrupts |
| 1195 | * if we have DMA enabled, so do a sanity check based on |
| 1196 | * the current setting of the MODE register. |
| 1197 | */ |
| 1198 | |
| 1199 | if ((NCR5380_read(MODE_REG) & MR_DMA) && ((basr & BASR_END_DMA_TRANSFER) || !(basr & BASR_PHASE_MATCH))) { |
| 1200 | int transfered; |
| 1201 | |
| 1202 | if (!hostdata->connected) |
| 1203 | panic("scsi%d : received end of DMA interrupt with no connected cmd\n", instance->hostno); |
| 1204 | |
| 1205 | transfered = (hostdata->dmalen - NCR5380_dma_residual(instance)); |
| 1206 | hostdata->connected->SCp.this_residual -= transferred; |
| 1207 | hostdata->connected->SCp.ptr += transferred; |
| 1208 | hostdata->dmalen = 0; |
| 1209 | |
| 1210 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1211 | |
| 1212 | /* FIXME: we need to poll briefly then defer a workqueue task ! */ |
| 1213 | NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, BASR_ACK, 0, 2*HZ); |
| 1214 | |
| 1215 | NCR5380_write(MODE_REG, MR_BASE); |
| 1216 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1217 | } |
| 1218 | #else |
| 1219 | dprintk(NDEBUG_INTR, ("scsi : unknown interrupt, BASR 0x%X, MR 0x%X, SR 0x%x\n", basr, NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG))); |
| 1220 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1221 | #endif |
| 1222 | } |
| 1223 | } /* if BASR_IRQ */ |
| 1224 | spin_unlock_irqrestore(instance->host_lock, flags); |
| 1225 | if(!done) |
| 1226 | schedule_work(&hostdata->coroutine); |
| 1227 | } while (!done); |
| 1228 | return IRQ_HANDLED; |
| 1229 | } |
| 1230 | |
| 1231 | #endif |
| 1232 | |
| 1233 | /** |
| 1234 | * collect_stats - collect stats on a scsi command |
| 1235 | * @hostdata: adapter |
| 1236 | * @cmd: command being issued |
| 1237 | * |
| 1238 | * Update the statistical data by parsing the command in question |
| 1239 | */ |
| 1240 | |
| 1241 | static void collect_stats(struct NCR5380_hostdata *hostdata, Scsi_Cmnd * cmd) |
| 1242 | { |
| 1243 | #ifdef NCR5380_STATS |
| 1244 | switch (cmd->cmnd[0]) { |
| 1245 | case WRITE: |
| 1246 | case WRITE_6: |
| 1247 | case WRITE_10: |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1248 | hostdata->time_write[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1249 | hostdata->pendingw--; |
| 1250 | break; |
| 1251 | case READ: |
| 1252 | case READ_6: |
| 1253 | case READ_10: |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1254 | hostdata->time_read[scmd_id(cmd)] += (jiffies - hostdata->timebase); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | hostdata->pendingr--; |
| 1256 | break; |
| 1257 | } |
| 1258 | #endif |
| 1259 | } |
| 1260 | |
| 1261 | |
| 1262 | /* |
| 1263 | * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, |
| 1264 | * int tag); |
| 1265 | * |
| 1266 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, |
| 1267 | * including ARBITRATION, SELECTION, and initial message out for |
| 1268 | * IDENTIFY and queue messages. |
| 1269 | * |
| 1270 | * Inputs : instance - instantiation of the 5380 driver on which this |
| 1271 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for |
| 1272 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for |
| 1273 | * the command that is presently connected. |
| 1274 | * |
| 1275 | * Returns : -1 if selection could not execute for some reason, |
| 1276 | * 0 if selection succeeded or failed because the target |
| 1277 | * did not respond. |
| 1278 | * |
| 1279 | * Side effects : |
| 1280 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
| 1281 | * with registers as they should have been on entry - ie |
| 1282 | * SELECT_ENABLE will be set appropriately, the NCR5380 |
| 1283 | * will cease to drive any SCSI bus signals. |
| 1284 | * |
| 1285 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
| 1286 | * instance->connected will be set to cmd. |
| 1287 | * SELECT interrupt will be disabled. |
| 1288 | * |
| 1289 | * If failed (no target) : cmd->scsi_done() will be called, and the |
| 1290 | * cmd->result host byte set to DID_BAD_TARGET. |
| 1291 | * |
| 1292 | * Locks: caller holds hostdata lock in IRQ mode |
| 1293 | */ |
| 1294 | |
| 1295 | static int NCR5380_select(struct Scsi_Host *instance, Scsi_Cmnd * cmd, int tag) |
| 1296 | { |
| 1297 | NCR5380_local_declare(); |
| 1298 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 1299 | unsigned char tmp[3], phase; |
| 1300 | unsigned char *data; |
| 1301 | int len; |
| 1302 | unsigned long timeout; |
| 1303 | unsigned char value; |
| 1304 | int err; |
| 1305 | NCR5380_setup(instance); |
| 1306 | |
| 1307 | if (hostdata->selecting) |
| 1308 | goto part2; |
| 1309 | |
| 1310 | hostdata->restart_select = 0; |
| 1311 | |
| 1312 | NCR5380_dprint(NDEBUG_ARBITRATION, instance); |
| 1313 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : starting arbitration, id = %d\n", instance->host_no, instance->this_id)); |
| 1314 | |
| 1315 | /* |
| 1316 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the |
| 1317 | * data bus during SELECTION. |
| 1318 | */ |
| 1319 | |
| 1320 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 1321 | |
| 1322 | /* |
| 1323 | * Start arbitration. |
| 1324 | */ |
| 1325 | |
| 1326 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| 1327 | NCR5380_write(MODE_REG, MR_ARBITRATE); |
| 1328 | |
| 1329 | |
| 1330 | /* We can be relaxed here, interrupts are on, we are |
| 1331 | in workqueue context, the birds are singing in the trees */ |
| 1332 | spin_unlock_irq(instance->host_lock); |
| 1333 | err = NCR5380_poll_politely(instance, INITIATOR_COMMAND_REG, ICR_ARBITRATION_PROGRESS, ICR_ARBITRATION_PROGRESS, 5*HZ); |
| 1334 | spin_lock_irq(instance->host_lock); |
| 1335 | if (err < 0) { |
| 1336 | printk(KERN_DEBUG "scsi: arbitration timeout at %d\n", __LINE__); |
| 1337 | NCR5380_write(MODE_REG, MR_BASE); |
| 1338 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1339 | goto failed; |
| 1340 | } |
| 1341 | |
| 1342 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : arbitration complete\n", instance->host_no)); |
| 1343 | |
| 1344 | /* |
| 1345 | * The arbitration delay is 2.2us, but this is a minimum and there is |
| 1346 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate |
| 1347 | * the integral nature of udelay(). |
| 1348 | * |
| 1349 | */ |
| 1350 | |
| 1351 | udelay(3); |
| 1352 | |
| 1353 | /* Check for lost arbitration */ |
| 1354 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
| 1355 | NCR5380_write(MODE_REG, MR_BASE); |
| 1356 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting MR_ARBITRATE\n", instance->host_no)); |
| 1357 | goto failed; |
| 1358 | } |
| 1359 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL); |
| 1360 | |
| 1361 | if (!(hostdata->flags & FLAG_DTC3181E) && |
| 1362 | /* RvC: DTC3181E has some trouble with this |
| 1363 | * so we simply removed it. Seems to work with |
| 1364 | * only Mustek scanner attached |
| 1365 | */ |
| 1366 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST)) { |
| 1367 | NCR5380_write(MODE_REG, MR_BASE); |
| 1368 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1369 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : lost arbitration, deasserting ICR_ASSERT_SEL\n", instance->host_no)); |
| 1370 | goto failed; |
| 1371 | } |
| 1372 | /* |
| 1373 | * Again, bus clear + bus settle time is 1.2us, however, this is |
| 1374 | * a minimum so we'll udelay ceil(1.2) |
| 1375 | */ |
| 1376 | |
| 1377 | udelay(2); |
| 1378 | |
| 1379 | dprintk(NDEBUG_ARBITRATION, ("scsi%d : won arbitration\n", instance->host_no)); |
| 1380 | |
| 1381 | /* |
| 1382 | * Now that we have won arbitration, start Selection process, asserting |
| 1383 | * the host and target ID's on the SCSI bus. |
| 1384 | */ |
| 1385 | |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1386 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << scmd_id(cmd)))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
| 1388 | /* |
| 1389 | * Raise ATN while SEL is true before BSY goes false from arbitration, |
| 1390 | * since this is the only way to guarantee that we'll get a MESSAGE OUT |
| 1391 | * phase immediately after selection. |
| 1392 | */ |
| 1393 | |
| 1394 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
| 1395 | NCR5380_write(MODE_REG, MR_BASE); |
| 1396 | |
| 1397 | /* |
| 1398 | * Reselect interrupts must be turned off prior to the dropping of BSY, |
| 1399 | * otherwise we will trigger an interrupt. |
| 1400 | */ |
| 1401 | NCR5380_write(SELECT_ENABLE_REG, 0); |
| 1402 | |
| 1403 | /* |
| 1404 | * The initiator shall then wait at least two deskew delays and release |
| 1405 | * the BSY signal. |
| 1406 | */ |
| 1407 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ |
| 1408 | |
| 1409 | /* Reset BSY */ |
| 1410 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
| 1411 | |
| 1412 | /* |
| 1413 | * Something weird happens when we cease to drive BSY - looks |
| 1414 | * like the board/chip is letting us do another read before the |
| 1415 | * appropriate propagation delay has expired, and we're confusing |
| 1416 | * a BSY signal from ourselves as the target's response to SELECTION. |
| 1417 | * |
| 1418 | * A small delay (the 'C++' frontend breaks the pipeline with an |
| 1419 | * unnecessary jump, making it work on my 386-33/Trantor T128, the |
| 1420 | * tighter 'C' code breaks and requires this) solves the problem - |
| 1421 | * the 1 us delay is arbitrary, and only used because this delay will |
| 1422 | * be the same on other platforms and since it works here, it should |
| 1423 | * work there. |
| 1424 | * |
| 1425 | * wingel suggests that this could be due to failing to wait |
| 1426 | * one deskew delay. |
| 1427 | */ |
| 1428 | |
| 1429 | udelay(1); |
| 1430 | |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1431 | dprintk(NDEBUG_SELECTION, ("scsi%d : selecting target %d\n", instance->host_no, scmd_id(cmd))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1432 | |
| 1433 | /* |
| 1434 | * The SCSI specification calls for a 250 ms timeout for the actual |
| 1435 | * selection. |
| 1436 | */ |
| 1437 | |
| 1438 | timeout = jiffies + (250 * HZ / 1000); |
| 1439 | |
| 1440 | /* |
| 1441 | * XXX very interesting - we're seeing a bounce where the BSY we |
| 1442 | * asserted is being reflected / still asserted (propagation delay?) |
| 1443 | * and it's detecting as true. Sigh. |
| 1444 | */ |
| 1445 | |
| 1446 | hostdata->select_time = 0; /* we count the clock ticks at which we polled */ |
| 1447 | hostdata->selecting = cmd; |
| 1448 | |
| 1449 | part2: |
| 1450 | /* RvC: here we enter after a sleeping period, or immediately after |
| 1451 | execution of part 1 |
| 1452 | we poll only once ech clock tick */ |
| 1453 | value = NCR5380_read(STATUS_REG) & (SR_BSY | SR_IO); |
| 1454 | |
| 1455 | if (!value && (hostdata->select_time < HZ/4)) { |
| 1456 | /* RvC: we still must wait for a device response */ |
| 1457 | hostdata->select_time++; /* after 25 ticks the device has failed */ |
| 1458 | NCR5380_set_timer(hostdata, 1); |
| 1459 | return 0; /* RvC: we return here with hostdata->selecting set, |
| 1460 | to go to sleep */ |
| 1461 | } |
| 1462 | |
| 1463 | hostdata->selecting = NULL;/* clear this pointer, because we passed the |
| 1464 | waiting period */ |
| 1465 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == (SR_SEL | SR_IO)) { |
| 1466 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1467 | NCR5380_reselect(instance); |
| 1468 | printk("scsi%d : reselection after won arbitration?\n", instance->host_no); |
| 1469 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1470 | return -1; |
| 1471 | } |
| 1472 | /* |
| 1473 | * No less than two deskew delays after the initiator detects the |
| 1474 | * BSY signal is true, it shall release the SEL signal and may |
| 1475 | * change the DATA BUS. -wingel |
| 1476 | */ |
| 1477 | |
| 1478 | udelay(1); |
| 1479 | |
| 1480 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1481 | |
| 1482 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
| 1483 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1484 | if (hostdata->targets_present & (1 << scmd_id(cmd))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | printk(KERN_DEBUG "scsi%d : weirdness\n", instance->host_no); |
| 1486 | if (hostdata->restart_select) |
| 1487 | printk(KERN_DEBUG "\trestart select\n"); |
| 1488 | NCR5380_dprint(NDEBUG_SELECTION, instance); |
| 1489 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1490 | return -1; |
| 1491 | } |
| 1492 | cmd->result = DID_BAD_TARGET << 16; |
| 1493 | collect_stats(hostdata, cmd); |
| 1494 | cmd->scsi_done(cmd); |
| 1495 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1496 | dprintk(NDEBUG_SELECTION, ("scsi%d : target did not respond within 250ms\n", instance->host_no)); |
| 1497 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1498 | return 0; |
| 1499 | } |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1500 | hostdata->targets_present |= (1 << scmd_id(cmd)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | |
| 1502 | /* |
| 1503 | * Since we followed the SCSI spec, and raised ATN while SEL |
| 1504 | * was true but before BSY was false during selection, the information |
| 1505 | * transfer phase should be a MESSAGE OUT phase so that we can send the |
| 1506 | * IDENTIFY message. |
| 1507 | * |
| 1508 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG |
| 1509 | * message (2 bytes) with a tag ID that we increment with every command |
| 1510 | * until it wraps back to 0. |
| 1511 | * |
| 1512 | * XXX - it turns out that there are some broken SCSI-II devices, |
| 1513 | * which claim to support tagged queuing but fail when more than |
| 1514 | * some number of commands are issued at once. |
| 1515 | */ |
| 1516 | |
| 1517 | /* Wait for start of REQ/ACK handshake */ |
| 1518 | |
| 1519 | spin_unlock_irq(instance->host_lock); |
| 1520 | err = NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, HZ); |
| 1521 | spin_lock_irq(instance->host_lock); |
| 1522 | |
| 1523 | if(err) { |
| 1524 | printk(KERN_ERR "scsi%d: timeout at NCR5380.c:%d\n", instance->host_no, __LINE__); |
| 1525 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1526 | goto failed; |
| 1527 | } |
| 1528 | |
| 1529 | dprintk(NDEBUG_SELECTION, ("scsi%d : target %d selected, going into MESSAGE OUT phase.\n", instance->host_no, cmd->device->id)); |
| 1530 | tmp[0] = IDENTIFY(((instance->irq == SCSI_IRQ_NONE) ? 0 : 1), cmd->device->lun); |
| 1531 | |
| 1532 | len = 1; |
| 1533 | cmd->tag = 0; |
| 1534 | |
| 1535 | /* Send message(s) */ |
| 1536 | data = tmp; |
| 1537 | phase = PHASE_MSGOUT; |
| 1538 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 1539 | dprintk(NDEBUG_SELECTION, ("scsi%d : nexus established.\n", instance->host_no)); |
| 1540 | /* XXX need to handle errors here */ |
| 1541 | hostdata->connected = cmd; |
| 1542 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| 1543 | |
| 1544 | if (cmd->SCp.ptr != (char *)cmd->sense_buffer) { |
| 1545 | initialize_SCp(cmd); |
| 1546 | } |
| 1547 | |
| 1548 | return 0; |
| 1549 | |
| 1550 | /* Selection failed */ |
| 1551 | failed: |
| 1552 | return -1; |
| 1553 | |
| 1554 | } |
| 1555 | |
| 1556 | /* |
| 1557 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, |
| 1558 | * unsigned char *phase, int *count, unsigned char **data) |
| 1559 | * |
| 1560 | * Purpose : transfers data in given phase using polled I/O |
| 1561 | * |
| 1562 | * Inputs : instance - instance of driver, *phase - pointer to |
| 1563 | * what phase is expected, *count - pointer to number of |
| 1564 | * bytes to transfer, **data - pointer to data pointer. |
| 1565 | * |
| 1566 | * Returns : -1 when different phase is entered without transferring |
| 1567 | * maximum number of bytes, 0 if all bytes or transfered or exit |
| 1568 | * is in same phase. |
| 1569 | * |
| 1570 | * Also, *phase, *count, *data are modified in place. |
| 1571 | * |
| 1572 | * XXX Note : handling for bus free may be useful. |
| 1573 | */ |
| 1574 | |
| 1575 | /* |
| 1576 | * Note : this code is not as quick as it could be, however it |
| 1577 | * IS 100% reliable, and for the actual data transfer where speed |
| 1578 | * counts, we will always do a pseudo DMA or DMA transfer. |
| 1579 | */ |
| 1580 | |
| 1581 | static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
| 1582 | NCR5380_local_declare(); |
| 1583 | unsigned char p = *phase, tmp; |
| 1584 | int c = *count; |
| 1585 | unsigned char *d = *data; |
| 1586 | /* |
| 1587 | * RvC: some administrative data to process polling time |
| 1588 | */ |
| 1589 | int break_allowed = 0; |
| 1590 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 1591 | NCR5380_setup(instance); |
| 1592 | |
| 1593 | if (!(p & SR_IO)) |
| 1594 | dprintk(NDEBUG_PIO, ("scsi%d : pio write %d bytes\n", instance->host_no, c)); |
| 1595 | else |
| 1596 | dprintk(NDEBUG_PIO, ("scsi%d : pio read %d bytes\n", instance->host_no, c)); |
| 1597 | |
| 1598 | /* |
| 1599 | * The NCR5380 chip will only drive the SCSI bus when the |
| 1600 | * phase specified in the appropriate bits of the TARGET COMMAND |
| 1601 | * REGISTER match the STATUS REGISTER |
| 1602 | */ |
| 1603 | |
| 1604 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
| 1605 | |
| 1606 | /* RvC: don't know if this is necessary, but other SCSI I/O is short |
| 1607 | * so breaks are not necessary there |
| 1608 | */ |
| 1609 | if ((p == PHASE_DATAIN) || (p == PHASE_DATAOUT)) { |
| 1610 | break_allowed = 1; |
| 1611 | } |
| 1612 | do { |
| 1613 | /* |
| 1614 | * Wait for assertion of REQ, after which the phase bits will be |
| 1615 | * valid |
| 1616 | */ |
| 1617 | |
| 1618 | /* RvC: we simply poll once, after that we stop temporarily |
| 1619 | * and let the device buffer fill up |
| 1620 | * if breaking is not allowed, we keep polling as long as needed |
| 1621 | */ |
| 1622 | |
| 1623 | /* FIXME */ |
| 1624 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ) && !break_allowed); |
| 1625 | if (!(tmp & SR_REQ)) { |
| 1626 | /* timeout condition */ |
| 1627 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| 1628 | break; |
| 1629 | } |
| 1630 | |
| 1631 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : REQ detected\n", instance->host_no)); |
| 1632 | |
| 1633 | /* Check for phase mismatch */ |
| 1634 | if ((tmp & PHASE_MASK) != p) { |
| 1635 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : phase mismatch\n", instance->host_no)); |
| 1636 | NCR5380_dprint_phase(NDEBUG_HANDSHAKE, instance); |
| 1637 | break; |
| 1638 | } |
| 1639 | /* Do actual transfer from SCSI bus to / from memory */ |
| 1640 | if (!(p & SR_IO)) |
| 1641 | NCR5380_write(OUTPUT_DATA_REG, *d); |
| 1642 | else |
| 1643 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| 1644 | |
| 1645 | ++d; |
| 1646 | |
| 1647 | /* |
| 1648 | * The SCSI standard suggests that in MSGOUT phase, the initiator |
| 1649 | * should drop ATN on the last byte of the message phase |
| 1650 | * after REQ has been asserted for the handshake but before |
| 1651 | * the initiator raises ACK. |
| 1652 | */ |
| 1653 | |
| 1654 | if (!(p & SR_IO)) { |
| 1655 | if (!((p & SR_MSG) && c > 1)) { |
| 1656 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
| 1657 | NCR5380_dprint(NDEBUG_PIO, instance); |
| 1658 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
| 1659 | } else { |
| 1660 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
| 1661 | NCR5380_dprint(NDEBUG_PIO, instance); |
| 1662 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| 1663 | } |
| 1664 | } else { |
| 1665 | NCR5380_dprint(NDEBUG_PIO, instance); |
| 1666 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
| 1667 | } |
| 1668 | |
| 1669 | /* FIXME - if this fails bus reset ?? */ |
| 1670 | NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, 0, 5*HZ); |
| 1671 | dprintk(NDEBUG_HANDSHAKE, ("scsi%d : req false, handshake complete\n", instance->host_no)); |
| 1672 | |
| 1673 | /* |
| 1674 | * We have several special cases to consider during REQ/ACK handshaking : |
| 1675 | * 1. We were in MSGOUT phase, and we are on the last byte of the |
| 1676 | * message. ATN must be dropped as ACK is dropped. |
| 1677 | * |
| 1678 | * 2. We are in a MSGIN phase, and we are on the last byte of the |
| 1679 | * message. We must exit with ACK asserted, so that the calling |
| 1680 | * code may raise ATN before dropping ACK to reject the message. |
| 1681 | * |
| 1682 | * 3. ACK and ATN are clear and the target may proceed as normal. |
| 1683 | */ |
| 1684 | if (!(p == PHASE_MSGIN && c == 1)) { |
| 1685 | if (p == PHASE_MSGOUT && c > 1) |
| 1686 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1687 | else |
| 1688 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1689 | } |
| 1690 | } while (--c); |
| 1691 | |
| 1692 | dprintk(NDEBUG_PIO, ("scsi%d : residual %d\n", instance->host_no, c)); |
| 1693 | |
| 1694 | *count = c; |
| 1695 | *data = d; |
| 1696 | tmp = NCR5380_read(STATUS_REG); |
| 1697 | if (tmp & SR_REQ) |
| 1698 | *phase = tmp & PHASE_MASK; |
| 1699 | else |
| 1700 | *phase = PHASE_UNKNOWN; |
| 1701 | |
| 1702 | if (!c || (*phase == p)) |
| 1703 | return 0; |
| 1704 | else |
| 1705 | return -1; |
| 1706 | } |
| 1707 | |
| 1708 | /** |
| 1709 | * do_reset - issue a reset command |
| 1710 | * @host: adapter to reset |
| 1711 | * |
| 1712 | * Issue a reset sequence to the NCR5380 and try and get the bus |
| 1713 | * back into sane shape. |
| 1714 | * |
| 1715 | * Locks: caller holds queue lock |
| 1716 | */ |
| 1717 | |
| 1718 | static void do_reset(struct Scsi_Host *host) { |
| 1719 | NCR5380_local_declare(); |
| 1720 | NCR5380_setup(host); |
| 1721 | |
| 1722 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK)); |
| 1723 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST); |
| 1724 | udelay(25); |
| 1725 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1726 | } |
| 1727 | |
| 1728 | /* |
| 1729 | * Function : do_abort (Scsi_Host *host) |
| 1730 | * |
| 1731 | * Purpose : abort the currently established nexus. Should only be |
| 1732 | * called from a routine which can drop into a |
| 1733 | * |
| 1734 | * Returns : 0 on success, -1 on failure. |
| 1735 | * |
| 1736 | * Locks: queue lock held by caller |
| 1737 | * FIXME: sort this out and get new_eh running |
| 1738 | */ |
| 1739 | |
| 1740 | static int do_abort(struct Scsi_Host *host) { |
| 1741 | NCR5380_local_declare(); |
| 1742 | unsigned char *msgptr, phase, tmp; |
| 1743 | int len; |
| 1744 | int rc; |
| 1745 | NCR5380_setup(host); |
| 1746 | |
| 1747 | |
| 1748 | /* Request message out phase */ |
| 1749 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1750 | |
| 1751 | /* |
| 1752 | * Wait for the target to indicate a valid phase by asserting |
| 1753 | * REQ. Once this happens, we'll have either a MSGOUT phase |
| 1754 | * and can immediately send the ABORT message, or we'll have some |
| 1755 | * other phase and will have to source/sink data. |
| 1756 | * |
| 1757 | * We really don't care what value was on the bus or what value |
| 1758 | * the target sees, so we just handshake. |
| 1759 | */ |
| 1760 | |
| 1761 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, SR_REQ, 60 * HZ); |
| 1762 | |
| 1763 | if(rc < 0) |
| 1764 | return -1; |
| 1765 | |
| 1766 | tmp = (unsigned char)rc; |
| 1767 | |
| 1768 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| 1769 | |
| 1770 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { |
| 1771 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| 1772 | rc = NCR5380_poll_politely(host, STATUS_REG, SR_REQ, 0, 3*HZ); |
| 1773 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1774 | if(rc == -1) |
| 1775 | return -1; |
| 1776 | } |
| 1777 | tmp = ABORT; |
| 1778 | msgptr = &tmp; |
| 1779 | len = 1; |
| 1780 | phase = PHASE_MSGOUT; |
| 1781 | NCR5380_transfer_pio(host, &phase, &len, &msgptr); |
| 1782 | |
| 1783 | /* |
| 1784 | * If we got here, and the command completed successfully, |
| 1785 | * we're about to go into bus free state. |
| 1786 | */ |
| 1787 | |
| 1788 | return len ? -1 : 0; |
| 1789 | } |
| 1790 | |
| 1791 | #if defined(REAL_DMA) || defined(PSEUDO_DMA) || defined (REAL_DMA_POLL) |
| 1792 | /* |
| 1793 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, |
| 1794 | * unsigned char *phase, int *count, unsigned char **data) |
| 1795 | * |
| 1796 | * Purpose : transfers data in given phase using either real |
| 1797 | * or pseudo DMA. |
| 1798 | * |
| 1799 | * Inputs : instance - instance of driver, *phase - pointer to |
| 1800 | * what phase is expected, *count - pointer to number of |
| 1801 | * bytes to transfer, **data - pointer to data pointer. |
| 1802 | * |
| 1803 | * Returns : -1 when different phase is entered without transferring |
| 1804 | * maximum number of bytes, 0 if all bytes or transfered or exit |
| 1805 | * is in same phase. |
| 1806 | * |
| 1807 | * Also, *phase, *count, *data are modified in place. |
| 1808 | * |
| 1809 | * Locks: io_request lock held by caller |
| 1810 | */ |
| 1811 | |
| 1812 | |
| 1813 | static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data) { |
| 1814 | NCR5380_local_declare(); |
| 1815 | register int c = *count; |
| 1816 | register unsigned char p = *phase; |
| 1817 | register unsigned char *d = *data; |
| 1818 | unsigned char tmp; |
| 1819 | int foo; |
| 1820 | #if defined(REAL_DMA_POLL) |
| 1821 | int cnt, toPIO; |
| 1822 | unsigned char saved_data = 0, overrun = 0, residue; |
| 1823 | #endif |
| 1824 | |
| 1825 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 1826 | |
| 1827 | NCR5380_setup(instance); |
| 1828 | |
| 1829 | if ((tmp = (NCR5380_read(STATUS_REG) & PHASE_MASK)) != p) { |
| 1830 | *phase = tmp; |
| 1831 | return -1; |
| 1832 | } |
| 1833 | #if defined(REAL_DMA) || defined(REAL_DMA_POLL) |
| 1834 | #ifdef READ_OVERRUNS |
| 1835 | if (p & SR_IO) { |
| 1836 | c -= 2; |
| 1837 | } |
| 1838 | #endif |
| 1839 | dprintk(NDEBUG_DMA, ("scsi%d : initializing DMA channel %d for %s, %d bytes %s %0x\n", instance->host_no, instance->dma_channel, (p & SR_IO) ? "reading" : "writing", c, (p & SR_IO) ? "to" : "from", (unsigned) d)); |
| 1840 | hostdata->dma_len = (p & SR_IO) ? NCR5380_dma_read_setup(instance, d, c) : NCR5380_dma_write_setup(instance, d, c); |
| 1841 | #endif |
| 1842 | |
| 1843 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
| 1844 | |
| 1845 | #ifdef REAL_DMA |
| 1846 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_EOP_INTR | MR_MONITOR_BSY); |
| 1847 | #elif defined(REAL_DMA_POLL) |
| 1848 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
| 1849 | #else |
| 1850 | /* |
| 1851 | * Note : on my sample board, watch-dog timeouts occurred when interrupts |
| 1852 | * were not disabled for the duration of a single DMA transfer, from |
| 1853 | * before the setting of DMA mode to after transfer of the last byte. |
| 1854 | */ |
| 1855 | |
| 1856 | #if defined(PSEUDO_DMA) && defined(UNSAFE) |
| 1857 | spin_unlock_irq(instance->host_lock); |
| 1858 | #endif |
| 1859 | /* KLL May need eop and parity in 53c400 */ |
| 1860 | if (hostdata->flags & FLAG_NCR53C400) |
| 1861 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_ENABLE_PAR_CHECK | MR_ENABLE_PAR_INTR | MR_ENABLE_EOP_INTR | MR_DMA_MODE | MR_MONITOR_BSY); |
| 1862 | else |
| 1863 | NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE); |
| 1864 | #endif /* def REAL_DMA */ |
| 1865 | |
| 1866 | dprintk(NDEBUG_DMA, ("scsi%d : mode reg = 0x%X\n", instance->host_no, NCR5380_read(MODE_REG))); |
| 1867 | |
| 1868 | /* |
| 1869 | * On the PAS16 at least I/O recovery delays are not needed here. |
| 1870 | * Everyone else seems to want them. |
| 1871 | */ |
| 1872 | |
| 1873 | if (p & SR_IO) { |
| 1874 | io_recovery_delay(1); |
| 1875 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
| 1876 | } else { |
| 1877 | io_recovery_delay(1); |
| 1878 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_DATA); |
| 1879 | io_recovery_delay(1); |
| 1880 | NCR5380_write(START_DMA_SEND_REG, 0); |
| 1881 | io_recovery_delay(1); |
| 1882 | } |
| 1883 | |
| 1884 | #if defined(REAL_DMA_POLL) |
| 1885 | do { |
| 1886 | tmp = NCR5380_read(BUS_AND_STATUS_REG); |
| 1887 | } while ((tmp & BASR_PHASE_MATCH) && !(tmp & (BASR_BUSY_ERROR | BASR_END_DMA_TRANSFER))); |
| 1888 | |
| 1889 | /* |
| 1890 | At this point, either we've completed DMA, or we have a phase mismatch, |
| 1891 | or we've unexpectedly lost BUSY (which is a real error). |
| 1892 | |
| 1893 | For write DMAs, we want to wait until the last byte has been |
| 1894 | transferred out over the bus before we turn off DMA mode. Alas, there |
| 1895 | seems to be no terribly good way of doing this on a 5380 under all |
| 1896 | conditions. For non-scatter-gather operations, we can wait until REQ |
| 1897 | and ACK both go false, or until a phase mismatch occurs. Gather-writes |
| 1898 | are nastier, since the device will be expecting more data than we |
| 1899 | are prepared to send it, and REQ will remain asserted. On a 53C8[01] we |
| 1900 | could test LAST BIT SENT to assure transfer (I imagine this is precisely |
| 1901 | why this signal was added to the newer chips) but on the older 538[01] |
| 1902 | this signal does not exist. The workaround for this lack is a watchdog; |
| 1903 | we bail out of the wait-loop after a modest amount of wait-time if |
| 1904 | the usual exit conditions are not met. Not a terribly clean or |
| 1905 | correct solution :-% |
| 1906 | |
| 1907 | Reads are equally tricky due to a nasty characteristic of the NCR5380. |
| 1908 | If the chip is in DMA mode for an READ, it will respond to a target's |
| 1909 | REQ by latching the SCSI data into the INPUT DATA register and asserting |
| 1910 | ACK, even if it has _already_ been notified by the DMA controller that |
| 1911 | the current DMA transfer has completed! If the NCR5380 is then taken |
| 1912 | out of DMA mode, this already-acknowledged byte is lost. |
| 1913 | |
| 1914 | This is not a problem for "one DMA transfer per command" reads, because |
| 1915 | the situation will never arise... either all of the data is DMA'ed |
| 1916 | properly, or the target switches to MESSAGE IN phase to signal a |
| 1917 | disconnection (either operation bringing the DMA to a clean halt). |
| 1918 | However, in order to handle scatter-reads, we must work around the |
| 1919 | problem. The chosen fix is to DMA N-2 bytes, then check for the |
| 1920 | condition before taking the NCR5380 out of DMA mode. One or two extra |
| 1921 | bytes are transferred via PIO as necessary to fill out the original |
| 1922 | request. |
| 1923 | */ |
| 1924 | |
| 1925 | if (p & SR_IO) { |
| 1926 | #ifdef READ_OVERRUNS |
| 1927 | udelay(10); |
| 1928 | if (((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | BASR_ACK)) == (BASR_PHASE_MATCH | BASR_ACK))) { |
| 1929 | saved_data = NCR5380_read(INPUT_DATA_REGISTER); |
| 1930 | overrun = 1; |
| 1931 | } |
| 1932 | #endif |
| 1933 | } else { |
| 1934 | int limit = 100; |
| 1935 | while (((tmp = NCR5380_read(BUS_AND_STATUS_REG)) & BASR_ACK) || (NCR5380_read(STATUS_REG) & SR_REQ)) { |
| 1936 | if (!(tmp & BASR_PHASE_MATCH)) |
| 1937 | break; |
| 1938 | if (--limit < 0) |
| 1939 | break; |
| 1940 | } |
| 1941 | } |
| 1942 | |
| 1943 | dprintk(NDEBUG_DMA, ("scsi%d : polled DMA transfer complete, basr 0x%X, sr 0x%X\n", instance->host_no, tmp, NCR5380_read(STATUS_REG))); |
| 1944 | |
| 1945 | NCR5380_write(MODE_REG, MR_BASE); |
| 1946 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1947 | |
| 1948 | residue = NCR5380_dma_residual(instance); |
| 1949 | c -= residue; |
| 1950 | *count -= c; |
| 1951 | *data += c; |
| 1952 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
| 1953 | |
| 1954 | #ifdef READ_OVERRUNS |
| 1955 | if (*phase == p && (p & SR_IO) && residue == 0) { |
| 1956 | if (overrun) { |
| 1957 | dprintk(NDEBUG_DMA, ("Got an input overrun, using saved byte\n")); |
| 1958 | **data = saved_data; |
| 1959 | *data += 1; |
| 1960 | *count -= 1; |
| 1961 | cnt = toPIO = 1; |
| 1962 | } else { |
| 1963 | printk("No overrun??\n"); |
| 1964 | cnt = toPIO = 2; |
| 1965 | } |
| 1966 | dprintk(NDEBUG_DMA, ("Doing %d-byte PIO to 0x%X\n", cnt, *data)); |
| 1967 | NCR5380_transfer_pio(instance, phase, &cnt, data); |
| 1968 | *count -= toPIO - cnt; |
| 1969 | } |
| 1970 | #endif |
| 1971 | |
| 1972 | 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))); |
| 1973 | return 0; |
| 1974 | |
| 1975 | #elif defined(REAL_DMA) |
| 1976 | return 0; |
| 1977 | #else /* defined(REAL_DMA_POLL) */ |
| 1978 | if (p & SR_IO) { |
| 1979 | #ifdef DMA_WORKS_RIGHT |
| 1980 | foo = NCR5380_pread(instance, d, c); |
| 1981 | #else |
| 1982 | int diff = 1; |
| 1983 | if (hostdata->flags & FLAG_NCR53C400) { |
| 1984 | diff = 0; |
| 1985 | } |
| 1986 | if (!(foo = NCR5380_pread(instance, d, c - diff))) { |
| 1987 | /* |
| 1988 | * We can't disable DMA mode after successfully transferring |
| 1989 | * what we plan to be the last byte, since that would open up |
| 1990 | * a race condition where if the target asserted REQ before |
| 1991 | * we got the DMA mode reset, the NCR5380 would have latched |
| 1992 | * an additional byte into the INPUT DATA register and we'd |
| 1993 | * have dropped it. |
| 1994 | * |
| 1995 | * The workaround was to transfer one fewer bytes than we |
| 1996 | * intended to with the pseudo-DMA read function, wait for |
| 1997 | * the chip to latch the last byte, read it, and then disable |
| 1998 | * pseudo-DMA mode. |
| 1999 | * |
| 2000 | * After REQ is asserted, the NCR5380 asserts DRQ and ACK. |
| 2001 | * REQ is deasserted when ACK is asserted, and not reasserted |
| 2002 | * until ACK goes false. Since the NCR5380 won't lower ACK |
| 2003 | * until DACK is asserted, which won't happen unless we twiddle |
| 2004 | * the DMA port or we take the NCR5380 out of DMA mode, we |
| 2005 | * can guarantee that we won't handshake another extra |
| 2006 | * byte. |
| 2007 | */ |
| 2008 | |
| 2009 | if (!(hostdata->flags & FLAG_NCR53C400)) { |
| 2010 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)); |
| 2011 | /* Wait for clean handshake */ |
| 2012 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
| 2013 | d[c - 1] = NCR5380_read(INPUT_DATA_REG); |
| 2014 | } |
| 2015 | } |
| 2016 | #endif |
| 2017 | } else { |
| 2018 | #ifdef DMA_WORKS_RIGHT |
| 2019 | foo = NCR5380_pwrite(instance, d, c); |
| 2020 | #else |
| 2021 | int timeout; |
| 2022 | dprintk(NDEBUG_C400_PWRITE, ("About to pwrite %d bytes\n", c)); |
| 2023 | if (!(foo = NCR5380_pwrite(instance, d, c))) { |
| 2024 | /* |
| 2025 | * Wait for the last byte to be sent. If REQ is being asserted for |
| 2026 | * the byte we're interested, we'll ACK it and it will go false. |
| 2027 | */ |
| 2028 | if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) { |
| 2029 | timeout = 20000; |
| 2030 | while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)); |
| 2031 | |
| 2032 | if (!timeout) |
| 2033 | dprintk(NDEBUG_LAST_BYTE_SENT, ("scsi%d : timed out on last byte\n", instance->host_no)); |
| 2034 | |
| 2035 | if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) { |
| 2036 | hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT; |
| 2037 | if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) { |
| 2038 | hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT; |
| 2039 | dprintk(NDEBUG_LAST_WRITE_SENT, ("scsi%d : last bit sent works\n", instance->host_no)); |
| 2040 | } |
| 2041 | } |
| 2042 | } else { |
| 2043 | dprintk(NDEBUG_C400_PWRITE, ("Waiting for LASTBYTE\n")); |
| 2044 | while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT)); |
| 2045 | dprintk(NDEBUG_C400_PWRITE, ("Got LASTBYTE\n")); |
| 2046 | } |
| 2047 | } |
| 2048 | #endif |
| 2049 | } |
| 2050 | NCR5380_write(MODE_REG, MR_BASE); |
| 2051 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2052 | |
| 2053 | if ((!(p & SR_IO)) && (hostdata->flags & FLAG_NCR53C400)) { |
| 2054 | dprintk(NDEBUG_C400_PWRITE, ("53C400w: Checking for IRQ\n")); |
| 2055 | if (NCR5380_read(BUS_AND_STATUS_REG) & BASR_IRQ) { |
| 2056 | dprintk(NDEBUG_C400_PWRITE, ("53C400w: got it, reading reset interrupt reg\n")); |
| 2057 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 2058 | } else { |
| 2059 | printk("53C400w: IRQ NOT THERE!\n"); |
| 2060 | } |
| 2061 | } |
| 2062 | *data = d + c; |
| 2063 | *count = 0; |
| 2064 | *phase = NCR5380_read(STATUS_REG) & PHASE_MASK; |
| 2065 | #if defined(PSEUDO_DMA) && defined(UNSAFE) |
| 2066 | spin_lock_irq(instance->host_lock); |
| 2067 | #endif /* defined(REAL_DMA_POLL) */ |
| 2068 | return foo; |
| 2069 | #endif /* def REAL_DMA */ |
| 2070 | } |
| 2071 | #endif /* defined(REAL_DMA) | defined(PSEUDO_DMA) */ |
| 2072 | |
| 2073 | /* |
| 2074 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) |
| 2075 | * |
| 2076 | * Purpose : run through the various SCSI phases and do as the target |
| 2077 | * directs us to. Operates on the currently connected command, |
| 2078 | * instance->connected. |
| 2079 | * |
| 2080 | * Inputs : instance, instance for which we are doing commands |
| 2081 | * |
| 2082 | * Side effects : SCSI things happen, the disconnected queue will be |
| 2083 | * modified if a command disconnects, *instance->connected will |
| 2084 | * change. |
| 2085 | * |
| 2086 | * XXX Note : we need to watch for bus free or a reset condition here |
| 2087 | * to recover from an unexpected bus free condition. |
| 2088 | * |
| 2089 | * Locks: io_request_lock held by caller in IRQ mode |
| 2090 | */ |
| 2091 | |
| 2092 | static void NCR5380_information_transfer(struct Scsi_Host *instance) { |
| 2093 | NCR5380_local_declare(); |
| 2094 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
| 2095 | unsigned char msgout = NOP; |
| 2096 | int sink = 0; |
| 2097 | int len; |
| 2098 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
| 2099 | int transfersize; |
| 2100 | #endif |
| 2101 | unsigned char *data; |
| 2102 | unsigned char phase, tmp, extended_msg[10], old_phase = 0xff; |
| 2103 | Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; |
| 2104 | /* RvC: we need to set the end of the polling time */ |
| 2105 | unsigned long poll_time = jiffies + USLEEP_POLL; |
| 2106 | |
| 2107 | NCR5380_setup(instance); |
| 2108 | |
| 2109 | while (1) { |
| 2110 | tmp = NCR5380_read(STATUS_REG); |
| 2111 | /* We only have a valid SCSI phase when REQ is asserted */ |
| 2112 | if (tmp & SR_REQ) { |
| 2113 | phase = (tmp & PHASE_MASK); |
| 2114 | if (phase != old_phase) { |
| 2115 | old_phase = phase; |
| 2116 | NCR5380_dprint_phase(NDEBUG_INFORMATION, instance); |
| 2117 | } |
| 2118 | if (sink && (phase != PHASE_MSGOUT)) { |
| 2119 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| 2120 | |
| 2121 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| 2122 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
| 2123 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 2124 | sink = 0; |
| 2125 | continue; |
| 2126 | } |
| 2127 | switch (phase) { |
| 2128 | case PHASE_DATAIN: |
| 2129 | case PHASE_DATAOUT: |
| 2130 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
| 2131 | printk("scsi%d : NDEBUG_NO_DATAOUT set, attempted DATAOUT aborted\n", instance->host_no); |
| 2132 | sink = 1; |
| 2133 | do_abort(instance); |
| 2134 | cmd->result = DID_ERROR << 16; |
| 2135 | cmd->done(cmd); |
| 2136 | return; |
| 2137 | #endif |
| 2138 | /* |
| 2139 | * If there is no room left in the current buffer in the |
| 2140 | * scatter-gather list, move onto the next one. |
| 2141 | */ |
| 2142 | |
| 2143 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
| 2144 | ++cmd->SCp.buffer; |
| 2145 | --cmd->SCp.buffers_residual; |
| 2146 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| 2147 | cmd->SCp.ptr = page_address(cmd->SCp.buffer->page)+ |
| 2148 | cmd->SCp.buffer->offset; |
| 2149 | dprintk(NDEBUG_INFORMATION, ("scsi%d : %d bytes and %d buffers left\n", instance->host_no, cmd->SCp.this_residual, cmd->SCp.buffers_residual)); |
| 2150 | } |
| 2151 | /* |
| 2152 | * The preferred transfer method is going to be |
| 2153 | * PSEUDO-DMA for systems that are strictly PIO, |
| 2154 | * since we can let the hardware do the handshaking. |
| 2155 | * |
| 2156 | * For this to work, we need to know the transfersize |
| 2157 | * ahead of time, since the pseudo-DMA code will sit |
| 2158 | * in an unconditional loop. |
| 2159 | */ |
| 2160 | |
| 2161 | #if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) |
| 2162 | /* KLL |
| 2163 | * PSEUDO_DMA is defined here. If this is the g_NCR5380 |
| 2164 | * driver then it will always be defined, so the |
| 2165 | * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base |
| 2166 | * NCR5380 case. I think this is a fairly clean solution. |
| 2167 | * We supplement these 2 if's with the flag. |
| 2168 | */ |
| 2169 | #ifdef NCR5380_dma_xfer_len |
| 2170 | if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) { |
| 2171 | #else |
| 2172 | transfersize = cmd->transfersize; |
| 2173 | |
| 2174 | #ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */ |
| 2175 | if (transfersize > 512) |
| 2176 | transfersize = 512; |
| 2177 | #endif /* LIMIT_TRANSFERSIZE */ |
| 2178 | |
| 2179 | if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) { |
| 2180 | /* Limit transfers to 32K, for xx400 & xx406 |
| 2181 | * pseudoDMA that transfers in 128 bytes blocks. */ |
| 2182 | if (transfersize > 32 * 1024) |
| 2183 | transfersize = 32 * 1024; |
| 2184 | #endif |
| 2185 | len = transfersize; |
| 2186 | if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) { |
| 2187 | /* |
| 2188 | * If the watchdog timer fires, all future accesses to this |
| 2189 | * device will use the polled-IO. |
| 2190 | */ |
Jeff Garzik | 017560f | 2005-10-24 18:04:36 -0400 | [diff] [blame] | 2191 | scmd_printk(KERN_INFO, cmd, |
| 2192 | "switching to slow handshake\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2193 | cmd->device->borken = 1; |
| 2194 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 2195 | sink = 1; |
| 2196 | do_abort(instance); |
| 2197 | cmd->result = DID_ERROR << 16; |
| 2198 | cmd->done(cmd); |
| 2199 | /* XXX - need to source or sink data here, as appropriate */ |
| 2200 | } else |
| 2201 | cmd->SCp.this_residual -= transfersize - len; |
| 2202 | } else |
| 2203 | #endif /* defined(PSEUDO_DMA) || defined(REAL_DMA_POLL) */ |
| 2204 | NCR5380_transfer_pio(instance, &phase, (int *) &cmd->SCp.this_residual, (unsigned char **) |
| 2205 | &cmd->SCp.ptr); |
| 2206 | break; |
| 2207 | case PHASE_MSGIN: |
| 2208 | len = 1; |
| 2209 | data = &tmp; |
| 2210 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2211 | cmd->SCp.Message = tmp; |
| 2212 | |
| 2213 | switch (tmp) { |
| 2214 | /* |
| 2215 | * Linking lets us reduce the time required to get the |
| 2216 | * next command out to the device, hopefully this will |
| 2217 | * mean we don't waste another revolution due to the delays |
| 2218 | * required by ARBITRATION and another SELECTION. |
| 2219 | * |
| 2220 | * In the current implementation proposal, low level drivers |
| 2221 | * merely have to start the next command, pointed to by |
| 2222 | * next_link, done() is called as with unlinked commands. |
| 2223 | */ |
| 2224 | #ifdef LINKED |
| 2225 | case LINKED_CMD_COMPLETE: |
| 2226 | case LINKED_FLG_CMD_COMPLETE: |
| 2227 | /* Accept message by clearing ACK */ |
| 2228 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2229 | dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked command complete.\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| 2230 | /* |
| 2231 | * Sanity check : A linked command should only terminate with |
| 2232 | * one of these messages if there are more linked commands |
| 2233 | * available. |
| 2234 | */ |
| 2235 | if (!cmd->next_link) { |
| 2236 | printk("scsi%d : target %d lun %d linked command complete, no next_link\n" instance->host_no, cmd->device->id, cmd->device->lun); |
| 2237 | sink = 1; |
| 2238 | do_abort(instance); |
| 2239 | return; |
| 2240 | } |
| 2241 | initialize_SCp(cmd->next_link); |
| 2242 | /* The next command is still part of this process */ |
| 2243 | cmd->next_link->tag = cmd->tag; |
| 2244 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| 2245 | dprintk(NDEBUG_LINKED, ("scsi%d : target %d lun %d linked request done, calling scsi_done().\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| 2246 | collect_stats(hostdata, cmd); |
| 2247 | cmd->scsi_done(cmd); |
| 2248 | cmd = hostdata->connected; |
| 2249 | break; |
| 2250 | #endif /* def LINKED */ |
| 2251 | case ABORT: |
| 2252 | case COMMAND_COMPLETE: |
| 2253 | /* Accept message by clearing ACK */ |
| 2254 | sink = 1; |
| 2255 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2256 | hostdata->connected = NULL; |
| 2257 | dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d, lun %d completed\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| 2258 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2259 | |
| 2260 | /* |
| 2261 | * I'm not sure what the correct thing to do here is : |
| 2262 | * |
| 2263 | * If the command that just executed is NOT a request |
| 2264 | * sense, the obvious thing to do is to set the result |
| 2265 | * code to the values of the stored parameters. |
| 2266 | * |
| 2267 | * If it was a REQUEST SENSE command, we need some way |
| 2268 | * to differentiate between the failure code of the original |
| 2269 | * and the failure code of the REQUEST sense - the obvious |
| 2270 | * case is success, where we fall through and leave the result |
| 2271 | * code unchanged. |
| 2272 | * |
| 2273 | * The non-obvious place is where the REQUEST SENSE failed |
| 2274 | */ |
| 2275 | |
| 2276 | if (cmd->cmnd[0] != REQUEST_SENSE) |
| 2277 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| 2278 | else if (status_byte(cmd->SCp.Status) != GOOD) |
| 2279 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); |
| 2280 | |
| 2281 | #ifdef AUTOSENSE |
| 2282 | if ((cmd->cmnd[0] != REQUEST_SENSE) && (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
| 2283 | dprintk(NDEBUG_AUTOSENSE, ("scsi%d : performing request sense\n", instance->host_no)); |
| 2284 | cmd->cmnd[0] = REQUEST_SENSE; |
| 2285 | cmd->cmnd[1] &= 0xe0; |
| 2286 | cmd->cmnd[2] = 0; |
| 2287 | cmd->cmnd[3] = 0; |
| 2288 | cmd->cmnd[4] = sizeof(cmd->sense_buffer); |
| 2289 | cmd->cmnd[5] = 0; |
| 2290 | |
| 2291 | cmd->SCp.buffer = NULL; |
| 2292 | cmd->SCp.buffers_residual = 0; |
| 2293 | cmd->SCp.ptr = (char *) cmd->sense_buffer; |
| 2294 | cmd->SCp.this_residual = sizeof(cmd->sense_buffer); |
| 2295 | |
| 2296 | LIST(cmd, hostdata->issue_queue); |
| 2297 | cmd->host_scribble = (unsigned char *) |
| 2298 | hostdata->issue_queue; |
| 2299 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
| 2300 | dprintk(NDEBUG_QUEUES, ("scsi%d : REQUEST SENSE added to head of issue queue\n", instance->host_no)); |
| 2301 | } else |
| 2302 | #endif /* def AUTOSENSE */ |
| 2303 | { |
| 2304 | collect_stats(hostdata, cmd); |
| 2305 | cmd->scsi_done(cmd); |
| 2306 | } |
| 2307 | |
| 2308 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2309 | /* |
| 2310 | * Restore phase bits to 0 so an interrupted selection, |
| 2311 | * arbitration can resume. |
| 2312 | */ |
| 2313 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 2314 | |
| 2315 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| 2316 | barrier(); |
| 2317 | return; |
| 2318 | case MESSAGE_REJECT: |
| 2319 | /* Accept message by clearing ACK */ |
| 2320 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2321 | switch (hostdata->last_message) { |
| 2322 | case HEAD_OF_QUEUE_TAG: |
| 2323 | case ORDERED_QUEUE_TAG: |
| 2324 | case SIMPLE_QUEUE_TAG: |
| 2325 | cmd->device->simple_tags = 0; |
| 2326 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| 2327 | break; |
| 2328 | default: |
| 2329 | break; |
| 2330 | } |
| 2331 | case DISCONNECT:{ |
| 2332 | /* Accept message by clearing ACK */ |
| 2333 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2334 | cmd->device->disconnect = 1; |
| 2335 | LIST(cmd, hostdata->disconnected_queue); |
| 2336 | cmd->host_scribble = (unsigned char *) |
| 2337 | hostdata->disconnected_queue; |
| 2338 | hostdata->connected = NULL; |
| 2339 | hostdata->disconnected_queue = cmd; |
| 2340 | dprintk(NDEBUG_QUEUES, ("scsi%d : command for target %d lun %d was moved from connected to" " the disconnected_queue\n", instance->host_no, cmd->device->id, cmd->device->lun)); |
| 2341 | /* |
| 2342 | * Restore phase bits to 0 so an interrupted selection, |
| 2343 | * arbitration can resume. |
| 2344 | */ |
| 2345 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 2346 | |
| 2347 | /* Enable reselect interrupts */ |
| 2348 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2349 | /* Wait for bus free to avoid nasty timeouts - FIXME timeout !*/ |
| 2350 | /* NCR538_poll_politely(instance, STATUS_REG, SR_BSY, 0, 30 * HZ); */ |
| 2351 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| 2352 | barrier(); |
| 2353 | return; |
| 2354 | } |
| 2355 | /* |
| 2356 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
| 2357 | * operation, in violation of the SCSI spec so we can safely |
| 2358 | * ignore SAVE/RESTORE pointers calls. |
| 2359 | * |
| 2360 | * Unfortunately, some disks violate the SCSI spec and |
| 2361 | * don't issue the required SAVE_POINTERS message before |
| 2362 | * disconnecting, and we have to break spec to remain |
| 2363 | * compatible. |
| 2364 | */ |
| 2365 | case SAVE_POINTERS: |
| 2366 | case RESTORE_POINTERS: |
| 2367 | /* Accept message by clearing ACK */ |
| 2368 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2369 | break; |
| 2370 | case EXTENDED_MESSAGE: |
| 2371 | /* |
| 2372 | * Extended messages are sent in the following format : |
| 2373 | * Byte |
| 2374 | * 0 EXTENDED_MESSAGE == 1 |
| 2375 | * 1 length (includes one byte for code, doesn't |
| 2376 | * include first two bytes) |
| 2377 | * 2 code |
| 2378 | * 3..length+1 arguments |
| 2379 | * |
| 2380 | * Start the extended message buffer with the EXTENDED_MESSAGE |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 2381 | * byte, since spi_print_msg() wants the whole thing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2382 | */ |
| 2383 | extended_msg[0] = EXTENDED_MESSAGE; |
| 2384 | /* Accept first byte by clearing ACK */ |
| 2385 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2386 | dprintk(NDEBUG_EXTENDED, ("scsi%d : receiving extended message\n", instance->host_no)); |
| 2387 | |
| 2388 | len = 2; |
| 2389 | data = extended_msg + 1; |
| 2390 | phase = PHASE_MSGIN; |
| 2391 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2392 | |
| 2393 | dprintk(NDEBUG_EXTENDED, ("scsi%d : length=%d, code=0x%02x\n", instance->host_no, (int) extended_msg[1], (int) extended_msg[2])); |
| 2394 | |
| 2395 | if (!len && extended_msg[1] <= (sizeof(extended_msg) - 1)) { |
| 2396 | /* Accept third byte by clearing ACK */ |
| 2397 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2398 | len = extended_msg[1] - 1; |
| 2399 | data = extended_msg + 3; |
| 2400 | phase = PHASE_MSGIN; |
| 2401 | |
| 2402 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2403 | dprintk(NDEBUG_EXTENDED, ("scsi%d : message received, residual %d\n", instance->host_no, len)); |
| 2404 | |
| 2405 | switch (extended_msg[2]) { |
| 2406 | case EXTENDED_SDTR: |
| 2407 | case EXTENDED_WDTR: |
| 2408 | case EXTENDED_MODIFY_DATA_POINTER: |
| 2409 | case EXTENDED_EXTENDED_IDENTIFY: |
| 2410 | tmp = 0; |
| 2411 | } |
| 2412 | } else if (len) { |
| 2413 | printk("scsi%d: error receiving extended message\n", instance->host_no); |
| 2414 | tmp = 0; |
| 2415 | } else { |
| 2416 | printk("scsi%d: extended message code %02x length %d is too long\n", instance->host_no, extended_msg[2], extended_msg[1]); |
| 2417 | tmp = 0; |
| 2418 | } |
| 2419 | /* Fall through to reject message */ |
| 2420 | |
| 2421 | /* |
| 2422 | * If we get something weird that we aren't expecting, |
| 2423 | * reject it. |
| 2424 | */ |
| 2425 | default: |
| 2426 | if (!tmp) { |
| 2427 | printk("scsi%d: rejecting message ", instance->host_no); |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 2428 | spi_print_msg(extended_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | printk("\n"); |
| 2430 | } else if (tmp != EXTENDED_MESSAGE) |
Jeff Garzik | 017560f | 2005-10-24 18:04:36 -0400 | [diff] [blame] | 2431 | scmd_printk(KERN_INFO, cmd, |
| 2432 | "rejecting unknown message %02x\n",tmp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | else |
Jeff Garzik | 017560f | 2005-10-24 18:04:36 -0400 | [diff] [blame] | 2434 | scmd_printk(KERN_INFO, cmd, |
| 2435 | "rejecting unknown extended message code %02x, length %d\n", extended_msg[1], extended_msg[0]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | |
| 2437 | msgout = MESSAGE_REJECT; |
| 2438 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 2439 | break; |
| 2440 | } /* switch (tmp) */ |
| 2441 | break; |
| 2442 | case PHASE_MSGOUT: |
| 2443 | len = 1; |
| 2444 | data = &msgout; |
| 2445 | hostdata->last_message = msgout; |
| 2446 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2447 | if (msgout == ABORT) { |
| 2448 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2449 | hostdata->connected = NULL; |
| 2450 | cmd->result = DID_ERROR << 16; |
| 2451 | collect_stats(hostdata, cmd); |
| 2452 | cmd->scsi_done(cmd); |
| 2453 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2454 | return; |
| 2455 | } |
| 2456 | msgout = NOP; |
| 2457 | break; |
| 2458 | case PHASE_CMDOUT: |
| 2459 | len = cmd->cmd_len; |
| 2460 | data = cmd->cmnd; |
| 2461 | /* |
| 2462 | * XXX for performance reasons, on machines with a |
| 2463 | * PSEUDO-DMA architecture we should probably |
| 2464 | * use the dma transfer function. |
| 2465 | */ |
| 2466 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2467 | if (!cmd->device->disconnect && should_disconnect(cmd->cmnd[0])) { |
| 2468 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| 2469 | dprintk(NDEBUG_USLEEP, ("scsi%d : issued command, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
| 2470 | return; |
| 2471 | } |
| 2472 | break; |
| 2473 | case PHASE_STATIN: |
| 2474 | len = 1; |
| 2475 | data = &tmp; |
| 2476 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2477 | cmd->SCp.Status = tmp; |
| 2478 | break; |
| 2479 | default: |
| 2480 | printk("scsi%d : unknown phase\n", instance->host_no); |
| 2481 | NCR5380_dprint(NDEBUG_ALL, instance); |
| 2482 | } /* switch(phase) */ |
| 2483 | } /* if (tmp * SR_REQ) */ |
| 2484 | else { |
| 2485 | /* RvC: go to sleep if polling time expired |
| 2486 | */ |
| 2487 | if (!cmd->device->disconnect && time_after_eq(jiffies, poll_time)) { |
| 2488 | NCR5380_set_timer(hostdata, USLEEP_SLEEP); |
| 2489 | dprintk(NDEBUG_USLEEP, ("scsi%d : poll timed out, sleeping until %ul\n", instance->host_no, hostdata->time_expires)); |
| 2490 | return; |
| 2491 | } |
| 2492 | } |
| 2493 | } /* while (1) */ |
| 2494 | } |
| 2495 | |
| 2496 | /* |
| 2497 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) |
| 2498 | * |
| 2499 | * Purpose : does reselection, initializing the instance->connected |
| 2500 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q |
| 2501 | * nexus has been reestablished, |
| 2502 | * |
| 2503 | * Inputs : instance - this instance of the NCR5380. |
| 2504 | * |
| 2505 | * Locks: io_request_lock held by caller if IRQ driven |
| 2506 | */ |
| 2507 | |
| 2508 | static void NCR5380_reselect(struct Scsi_Host *instance) { |
| 2509 | NCR5380_local_declare(); |
| 2510 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) |
| 2511 | instance->hostdata; |
| 2512 | unsigned char target_mask; |
| 2513 | unsigned char lun, phase; |
| 2514 | int len; |
| 2515 | unsigned char msg[3]; |
| 2516 | unsigned char *data; |
| 2517 | Scsi_Cmnd *tmp = NULL, *prev; |
| 2518 | int abort = 0; |
| 2519 | NCR5380_setup(instance); |
| 2520 | |
| 2521 | /* |
| 2522 | * Disable arbitration, etc. since the host adapter obviously |
| 2523 | * lost, and tell an interrupted NCR5380_select() to restart. |
| 2524 | */ |
| 2525 | |
| 2526 | NCR5380_write(MODE_REG, MR_BASE); |
| 2527 | hostdata->restart_select = 1; |
| 2528 | |
| 2529 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); |
| 2530 | dprintk(NDEBUG_SELECTION, ("scsi%d : reselect\n", instance->host_no)); |
| 2531 | |
| 2532 | /* |
| 2533 | * At this point, we have detected that our SCSI ID is on the bus, |
| 2534 | * SEL is true and BSY was false for at least one bus settle delay |
| 2535 | * (400 ns). |
| 2536 | * |
| 2537 | * We must assert BSY ourselves, until the target drops the SEL |
| 2538 | * signal. |
| 2539 | */ |
| 2540 | |
| 2541 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); |
| 2542 | |
| 2543 | /* FIXME: timeout too long, must fail to workqueue */ |
| 2544 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_SEL, 0, 2*HZ)<0) |
| 2545 | abort = 1; |
| 2546 | |
| 2547 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2548 | |
| 2549 | /* |
| 2550 | * Wait for target to go into MSGIN. |
| 2551 | * FIXME: timeout needed and fail to work queeu |
| 2552 | */ |
| 2553 | |
| 2554 | if(NCR5380_poll_politely(instance, STATUS_REG, SR_REQ, SR_REQ, 2*HZ)) |
| 2555 | abort = 1; |
| 2556 | |
| 2557 | len = 1; |
| 2558 | data = msg; |
| 2559 | phase = PHASE_MSGIN; |
| 2560 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2561 | |
| 2562 | if (!(msg[0] & 0x80)) { |
| 2563 | printk(KERN_ERR "scsi%d : expecting IDENTIFY message, got ", instance->host_no); |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 2564 | spi_print_msg(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2565 | abort = 1; |
| 2566 | } else { |
| 2567 | /* Accept message by clearing ACK */ |
| 2568 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2569 | lun = (msg[0] & 0x07); |
| 2570 | |
| 2571 | /* |
| 2572 | * We need to add code for SCSI-II to track which devices have |
| 2573 | * I_T_L_Q nexuses established, and which have simple I_T_L |
| 2574 | * nexuses so we can chose to do additional data transfer. |
| 2575 | */ |
| 2576 | |
| 2577 | /* |
| 2578 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we |
| 2579 | * just reestablished, and remove it from the disconnected queue. |
| 2580 | */ |
| 2581 | |
| 2582 | |
| 2583 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; tmp; prev = tmp, tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| 2584 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) |
| 2585 | ) { |
| 2586 | if (prev) { |
| 2587 | REMOVE(prev, prev->host_scribble, tmp, tmp->host_scribble); |
| 2588 | prev->host_scribble = tmp->host_scribble; |
| 2589 | } else { |
| 2590 | REMOVE(-1, hostdata->disconnected_queue, tmp, tmp->host_scribble); |
| 2591 | hostdata->disconnected_queue = (Scsi_Cmnd *) tmp->host_scribble; |
| 2592 | } |
| 2593 | tmp->host_scribble = NULL; |
| 2594 | break; |
| 2595 | } |
| 2596 | if (!tmp) { |
| 2597 | printk(KERN_ERR "scsi%d : warning : target bitmask %02x lun %d not in disconnect_queue.\n", instance->host_no, target_mask, lun); |
| 2598 | /* |
| 2599 | * Since we have an established nexus that we can't do anything with, |
| 2600 | * we must abort it. |
| 2601 | */ |
| 2602 | abort = 1; |
| 2603 | } |
| 2604 | } |
| 2605 | |
| 2606 | if (abort) { |
| 2607 | do_abort(instance); |
| 2608 | } else { |
| 2609 | hostdata->connected = tmp; |
| 2610 | dprintk(NDEBUG_RESELECTION, ("scsi%d : nexus established, target = %d, lun = %d, tag = %d\n", instance->host_no, tmp->target, tmp->lun, tmp->tag)); |
| 2611 | } |
| 2612 | } |
| 2613 | |
| 2614 | /* |
| 2615 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) |
| 2616 | * |
| 2617 | * Purpose : called by interrupt handler when DMA finishes or a phase |
| 2618 | * mismatch occurs (which would finish the DMA transfer). |
| 2619 | * |
| 2620 | * Inputs : instance - this instance of the NCR5380. |
| 2621 | * |
| 2622 | * Returns : pointer to the Scsi_Cmnd structure for which the I_T_L |
| 2623 | * nexus has been reestablished, on failure NULL is returned. |
| 2624 | */ |
| 2625 | |
| 2626 | #ifdef REAL_DMA |
| 2627 | static void NCR5380_dma_complete(NCR5380_instance * instance) { |
| 2628 | NCR5380_local_declare(); |
| 2629 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata * instance->hostdata); |
| 2630 | int transferred; |
| 2631 | NCR5380_setup(instance); |
| 2632 | |
| 2633 | /* |
| 2634 | * XXX this might not be right. |
| 2635 | * |
| 2636 | * Wait for final byte to transfer, ie wait for ACK to go false. |
| 2637 | * |
| 2638 | * We should use the Last Byte Sent bit, unfortunately this is |
| 2639 | * not available on the 5380/5381 (only the various CMOS chips) |
| 2640 | * |
| 2641 | * FIXME: timeout, and need to handle long timeout/irq case |
| 2642 | */ |
| 2643 | |
| 2644 | NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, BASR_ACK, 0, 5*HZ); |
| 2645 | |
| 2646 | NCR5380_write(MODE_REG, MR_BASE); |
| 2647 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2648 | |
| 2649 | /* |
| 2650 | * The only places we should see a phase mismatch and have to send |
| 2651 | * data from the same set of pointers will be the data transfer |
| 2652 | * phases. So, residual, requested length are only important here. |
| 2653 | */ |
| 2654 | |
| 2655 | if (!(hostdata->connected->SCp.phase & SR_CD)) { |
| 2656 | transferred = instance->dmalen - NCR5380_dma_residual(); |
| 2657 | hostdata->connected->SCp.this_residual -= transferred; |
| 2658 | hostdata->connected->SCp.ptr += transferred; |
| 2659 | } |
| 2660 | } |
| 2661 | #endif /* def REAL_DMA */ |
| 2662 | |
| 2663 | /* |
| 2664 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) |
| 2665 | * |
| 2666 | * Purpose : abort a command |
| 2667 | * |
| 2668 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the |
| 2669 | * host byte of the result field to, if zero DID_ABORTED is |
| 2670 | * used. |
| 2671 | * |
| 2672 | * Returns : 0 - success, -1 on failure. |
| 2673 | * |
| 2674 | * XXX - there is no way to abort the command that is currently |
| 2675 | * connected, you have to wait for it to complete. If this is |
| 2676 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
| 2677 | * called where the loop started in NCR5380_main(). |
| 2678 | * |
| 2679 | * Locks: host lock taken by caller |
| 2680 | */ |
| 2681 | |
| 2682 | static int NCR5380_abort(Scsi_Cmnd * cmd) { |
| 2683 | NCR5380_local_declare(); |
| 2684 | struct Scsi_Host *instance = cmd->device->host; |
| 2685 | struct NCR5380_hostdata *hostdata = (struct NCR5380_hostdata *) instance->hostdata; |
| 2686 | Scsi_Cmnd *tmp, **prev; |
| 2687 | |
| 2688 | printk(KERN_WARNING "scsi%d : aborting command\n", instance->host_no); |
| db9dff3 | 2005-04-03 14:53:59 -0500 | [diff] [blame] | 2689 | scsi_print_command(cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2690 | |
| 2691 | NCR5380_print_status(instance); |
| 2692 | |
| 2693 | NCR5380_setup(instance); |
| 2694 | |
| 2695 | dprintk(NDEBUG_ABORT, ("scsi%d : abort called\n", instance->host_no)); |
| 2696 | dprintk(NDEBUG_ABORT, (" basr 0x%X, sr 0x%X\n", NCR5380_read(BUS_AND_STATUS_REG), NCR5380_read(STATUS_REG))); |
| 2697 | |
| 2698 | #if 0 |
| 2699 | /* |
| 2700 | * Case 1 : If the command is the currently executing command, |
| 2701 | * we'll set the aborted flag and return control so that |
| 2702 | * information transfer routine can exit cleanly. |
| 2703 | */ |
| 2704 | |
| 2705 | if (hostdata->connected == cmd) { |
| 2706 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting connected command\n", instance->host_no)); |
| 2707 | hostdata->aborted = 1; |
| 2708 | /* |
| 2709 | * We should perform BSY checking, and make sure we haven't slipped |
| 2710 | * into BUS FREE. |
| 2711 | */ |
| 2712 | |
| 2713 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); |
| 2714 | /* |
| 2715 | * Since we can't change phases until we've completed the current |
| 2716 | * handshake, we have to source or sink a byte of data if the current |
| 2717 | * phase is not MSGOUT. |
| 2718 | */ |
| 2719 | |
| 2720 | /* |
| 2721 | * Return control to the executing NCR drive so we can clear the |
| 2722 | * aborted flag and get back into our main loop. |
| 2723 | */ |
| 2724 | |
| 2725 | return 0; |
| 2726 | } |
| 2727 | #endif |
| 2728 | |
| 2729 | /* |
| 2730 | * Case 2 : If the command hasn't been issued yet, we simply remove it |
| 2731 | * from the issue queue. |
| 2732 | */ |
| 2733 | |
| 2734 | dprintk(NDEBUG_ABORT, ("scsi%d : abort going into loop.\n", instance->host_no)); |
| 2735 | for (prev = (Scsi_Cmnd **) & (hostdata->issue_queue), tmp = (Scsi_Cmnd *) hostdata->issue_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| 2736 | if (cmd == tmp) { |
| 2737 | REMOVE(5, *prev, tmp, tmp->host_scribble); |
| 2738 | (*prev) = (Scsi_Cmnd *) tmp->host_scribble; |
| 2739 | tmp->host_scribble = NULL; |
| 2740 | tmp->result = DID_ABORT << 16; |
| 2741 | dprintk(NDEBUG_ABORT, ("scsi%d : abort removed command from issue queue.\n", instance->host_no)); |
| 2742 | tmp->done(tmp); |
| 2743 | return SUCCESS; |
| 2744 | } |
| 2745 | #if (NDEBUG & NDEBUG_ABORT) |
| 2746 | /* KLL */ |
| 2747 | else if (prev == tmp) |
| 2748 | printk(KERN_ERR "scsi%d : LOOP\n", instance->host_no); |
| 2749 | #endif |
| 2750 | |
| 2751 | /* |
| 2752 | * Case 3 : If any commands are connected, we're going to fail the abort |
| 2753 | * and let the high level SCSI driver retry at a later time or |
| 2754 | * issue a reset. |
| 2755 | * |
| 2756 | * Timeouts, and therefore aborted commands, will be highly unlikely |
| 2757 | * and handling them cleanly in this situation would make the common |
| 2758 | * case of noresets less efficient, and would pollute our code. So, |
| 2759 | * we fail. |
| 2760 | */ |
| 2761 | |
| 2762 | if (hostdata->connected) { |
| 2763 | dprintk(NDEBUG_ABORT, ("scsi%d : abort failed, command connected.\n", instance->host_no)); |
| 2764 | return FAILED; |
| 2765 | } |
| 2766 | /* |
| 2767 | * Case 4: If the command is currently disconnected from the bus, and |
| 2768 | * there are no connected commands, we reconnect the I_T_L or |
| 2769 | * I_T_L_Q nexus associated with it, go into message out, and send |
| 2770 | * an abort message. |
| 2771 | * |
| 2772 | * This case is especially ugly. In order to reestablish the nexus, we |
| 2773 | * need to call NCR5380_select(). The easiest way to implement this |
| 2774 | * function was to abort if the bus was busy, and let the interrupt |
| 2775 | * handler triggered on the SEL for reselect take care of lost arbitrations |
| 2776 | * where necessary, meaning interrupts need to be enabled. |
| 2777 | * |
| 2778 | * When interrupts are enabled, the queues may change - so we |
| 2779 | * can't remove it from the disconnected queue before selecting it |
| 2780 | * because that could cause a failure in hashing the nexus if that |
| 2781 | * device reselected. |
| 2782 | * |
| 2783 | * Since the queues may change, we can't use the pointers from when we |
| 2784 | * first locate it. |
| 2785 | * |
| 2786 | * So, we must first locate the command, and if NCR5380_select() |
| 2787 | * succeeds, then issue the abort, relocate the command and remove |
| 2788 | * it from the disconnected queue. |
| 2789 | */ |
| 2790 | |
| 2791 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| 2792 | if (cmd == tmp) { |
| 2793 | dprintk(NDEBUG_ABORT, ("scsi%d : aborting disconnected command.\n", instance->host_no)); |
| 2794 | |
| 2795 | if (NCR5380_select(instance, cmd, (int) cmd->tag)) |
| 2796 | return FAILED; |
| 2797 | dprintk(NDEBUG_ABORT, ("scsi%d : nexus reestablished.\n", instance->host_no)); |
| 2798 | |
| 2799 | do_abort(instance); |
| 2800 | |
| 2801 | for (prev = (Scsi_Cmnd **) & (hostdata->disconnected_queue), tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; prev = (Scsi_Cmnd **) & (tmp->host_scribble), tmp = (Scsi_Cmnd *) tmp->host_scribble) |
| 2802 | if (cmd == tmp) { |
| 2803 | REMOVE(5, *prev, tmp, tmp->host_scribble); |
| 2804 | *prev = (Scsi_Cmnd *) tmp->host_scribble; |
| 2805 | tmp->host_scribble = NULL; |
| 2806 | tmp->result = DID_ABORT << 16; |
| 2807 | tmp->done(tmp); |
| 2808 | return SUCCESS; |
| 2809 | } |
| 2810 | } |
| 2811 | /* |
| 2812 | * Case 5 : If we reached this point, the command was not found in any of |
| 2813 | * the queues. |
| 2814 | * |
| 2815 | * We probably reached this point because of an unlikely race condition |
| 2816 | * between the command completing successfully and the abortion code, |
| 2817 | * so we won't panic, but we will notify the user in case something really |
| 2818 | * broke. |
| 2819 | */ |
| 2820 | printk(KERN_WARNING "scsi%d : warning : SCSI command probably completed successfully\n" |
| 2821 | " before abortion\n", instance->host_no); |
| 2822 | return FAILED; |
| 2823 | } |
| 2824 | |
| 2825 | |
| 2826 | /* |
| 2827 | * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) |
| 2828 | * |
| 2829 | * Purpose : reset the SCSI bus. |
| 2830 | * |
| 2831 | * Returns : SUCCESS |
| 2832 | * |
| 2833 | * Locks: host lock taken by caller |
| 2834 | */ |
| 2835 | |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 2836 | static int NCR5380_bus_reset(Scsi_Cmnd * cmd) |
| 2837 | { |
| 2838 | struct Scsi_Host *instance = cmd->device->host; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2839 | |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 2840 | NCR5380_local_declare(); |
| 2841 | NCR5380_setup(instance); |
| 2842 | NCR5380_print_status(instance); |
| 2843 | |
| 2844 | spin_lock_irq(instance->host_lock); |
| 2845 | do_reset(instance); |
| 2846 | spin_unlock_irq(instance->host_lock); |
| 2847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2848 | return SUCCESS; |
| 2849 | } |