Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* sun3_NCR5380.c -- adapted from atari_NCR5380.c for the sun3 by |
| 2 | Sam Creasey. */ |
| 3 | /* |
| 4 | * NCR 5380 generic driver routines. These should make it *trivial* |
| 5 | * to implement 5380 SCSI drivers under Linux with a non-trantor |
| 6 | * architecture. |
| 7 | * |
| 8 | * Note that these routines also work with NR53c400 family chips. |
| 9 | * |
| 10 | * Copyright 1993, Drew Eckhardt |
| 11 | * Visionary Computing |
| 12 | * (Unix and Linux consulting and custom programming) |
| 13 | * drew@colorado.edu |
| 14 | * +1 (303) 666-5836 |
| 15 | * |
| 16 | * DISTRIBUTION RELEASE 6. |
| 17 | * |
| 18 | * For more information, please consult |
| 19 | * |
| 20 | * NCR 5380 Family |
| 21 | * SCSI Protocol Controller |
| 22 | * Databook |
| 23 | * |
| 24 | * NCR Microelectronics |
| 25 | * 1635 Aeroplaza Drive |
| 26 | * Colorado Springs, CO 80916 |
| 27 | * 1+ (719) 578-3400 |
| 28 | * 1+ (800) 334-5454 |
| 29 | */ |
| 30 | |
| 31 | /* |
| 32 | * ++roman: To port the 5380 driver to the Atari, I had to do some changes in |
| 33 | * this file, too: |
| 34 | * |
| 35 | * - Some of the debug statements were incorrect (undefined variables and the |
| 36 | * like). I fixed that. |
| 37 | * |
| 38 | * - In information_transfer(), I think a #ifdef was wrong. Looking at the |
| 39 | * possible DMA transfer size should also happen for REAL_DMA. I added this |
| 40 | * in the #if statement. |
| 41 | * |
| 42 | * - When using real DMA, information_transfer() should return in a DATAOUT |
| 43 | * phase after starting the DMA. It has nothing more to do. |
| 44 | * |
| 45 | * - The interrupt service routine should run main after end of DMA, too (not |
| 46 | * only after RESELECTION interrupts). Additionally, it should _not_ test |
| 47 | * for more interrupts after running main, since a DMA process may have |
| 48 | * been started and interrupts are turned on now. The new int could happen |
| 49 | * inside the execution of NCR5380_intr(), leading to recursive |
| 50 | * calls. |
| 51 | * |
| 52 | * - I've added a function merge_contiguous_buffers() that tries to |
| 53 | * merge scatter-gather buffers that are located at contiguous |
| 54 | * physical addresses and can be processed with the same DMA setup. |
| 55 | * Since most scatter-gather operations work on a page (4K) of |
| 56 | * 4 buffers (1K), in more than 90% of all cases three interrupts and |
| 57 | * DMA setup actions are saved. |
| 58 | * |
| 59 | * - I've deleted all the stuff for AUTOPROBE_IRQ, REAL_DMA_POLL, PSEUDO_DMA |
| 60 | * and USLEEP, because these were messing up readability and will never be |
| 61 | * needed for Atari SCSI. |
| 62 | * |
| 63 | * - I've revised the NCR5380_main() calling scheme (relax the 'main_running' |
| 64 | * stuff), and 'main' is executed in a bottom half if awoken by an |
| 65 | * interrupt. |
| 66 | * |
| 67 | * - The code was quite cluttered up by "#if (NDEBUG & NDEBUG_*) printk..." |
| 68 | * constructs. In my eyes, this made the source rather unreadable, so I |
| 69 | * finally replaced that by the *_PRINTK() macros. |
| 70 | * |
| 71 | */ |
| db9dff3 | 2005-04-03 14:53:59 -0500 | [diff] [blame] | 72 | #include <scsi/scsi_dbg.h> |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 73 | #include <scsi/scsi_transport_spi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * Further development / testing that should be done : |
| 77 | * 1. Test linked command handling code after Eric is ready with |
| 78 | * the high level code. |
| 79 | */ |
| 80 | |
| 81 | #if (NDEBUG & NDEBUG_LISTS) |
| 82 | #define LIST(x,y) \ |
| 83 | { printk("LINE:%d Adding %p to %p\n", __LINE__, (void*)(x), (void*)(y)); \ |
| 84 | if ((x)==(y)) udelay(5); } |
| 85 | #define REMOVE(w,x,y,z) \ |
| 86 | { printk("LINE:%d Removing: %p->%p %p->%p \n", __LINE__, \ |
| 87 | (void*)(w), (void*)(x), (void*)(y), (void*)(z)); \ |
| 88 | if ((x)==(y)) udelay(5); } |
| 89 | #else |
| 90 | #define LIST(x,y) |
| 91 | #define REMOVE(w,x,y,z) |
| 92 | #endif |
| 93 | |
| 94 | #ifndef notyet |
| 95 | #undef LINKED |
| 96 | #endif |
| 97 | |
| 98 | /* |
| 99 | * Design |
| 100 | * Issues : |
| 101 | * |
| 102 | * The other Linux SCSI drivers were written when Linux was Intel PC-only, |
| 103 | * and specifically for each board rather than each chip. This makes their |
| 104 | * adaptation to platforms like the Mac (Some of which use NCR5380's) |
| 105 | * more difficult than it has to be. |
| 106 | * |
| 107 | * Also, many of the SCSI drivers were written before the command queuing |
| 108 | * routines were implemented, meaning their implementations of queued |
| 109 | * commands were hacked on rather than designed in from the start. |
| 110 | * |
| 111 | * When I designed the Linux SCSI drivers I figured that |
| 112 | * while having two different SCSI boards in a system might be useful |
| 113 | * for debugging things, two of the same type wouldn't be used. |
| 114 | * Well, I was wrong and a number of users have mailed me about running |
| 115 | * multiple high-performance SCSI boards in a server. |
| 116 | * |
| 117 | * Finally, when I get questions from users, I have no idea what |
| 118 | * revision of my driver they are running. |
| 119 | * |
| 120 | * This driver attempts to address these problems : |
| 121 | * This is a generic 5380 driver. To use it on a different platform, |
| 122 | * one simply writes appropriate system specific macros (ie, data |
| 123 | * transfer - some PC's will use the I/O bus, 68K's must use |
| 124 | * memory mapped) and drops this file in their 'C' wrapper. |
| 125 | * |
| 126 | * As far as command queueing, two queues are maintained for |
| 127 | * each 5380 in the system - commands that haven't been issued yet, |
| 128 | * and commands that are currently executing. This means that an |
| 129 | * unlimited number of commands may be queued, letting |
| 130 | * more commands propagate from the higher driver levels giving higher |
| 131 | * throughput. Note that both I_T_L and I_T_L_Q nexuses are supported, |
| 132 | * allowing multiple commands to propagate all the way to a SCSI-II device |
| 133 | * while a command is already executing. |
| 134 | * |
| 135 | * To solve the multiple-boards-in-the-same-system problem, |
| 136 | * there is a separate instance structure for each instance |
| 137 | * of a 5380 in the system. So, multiple NCR5380 drivers will |
| 138 | * be able to coexist with appropriate changes to the high level |
| 139 | * SCSI code. |
| 140 | * |
| 141 | * A NCR5380_PUBLIC_REVISION macro is provided, with the release |
| 142 | * number (updated for each public release) printed by the |
| 143 | * NCR5380_print_options command, which should be called from the |
| 144 | * wrapper detect function, so that I know what release of the driver |
| 145 | * users are using. |
| 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 when not running by the interrupt handler, |
| 171 | * timer, and queue command function. It attempts to establish |
| 172 | * I_T_L or I_T_L_Q nexuses by removing the commands from the |
| 173 | * issue queue and calling NCR5380_select() if a nexus |
| 174 | * is not established. |
| 175 | * |
| 176 | * Once a nexus is established, the NCR5380_information_transfer() |
| 177 | * phase goes through the various phases as instructed by the target. |
| 178 | * if the target goes into MSG IN and sends a DISCONNECT message, |
| 179 | * the command structure is placed into the per instance disconnected |
| 180 | * queue, and NCR5380_main tries to find more work. If USLEEP |
| 181 | * was defined, and the target is idle for too long, the system |
| 182 | * will try to sleep. |
| 183 | * |
| 184 | * If a command has disconnected, eventually an interrupt will trigger, |
| 185 | * calling NCR5380_intr() which will in turn call NCR5380_reselect |
| 186 | * to reestablish a nexus. This will run main if necessary. |
| 187 | * |
| 188 | * On command termination, the done function will be called as |
| 189 | * appropriate. |
| 190 | * |
| 191 | * SCSI pointers are maintained in the SCp field of SCSI command |
| 192 | * structures, being initialized after the command is connected |
| 193 | * in NCR5380_select, and set as appropriate in NCR5380_information_transfer. |
| 194 | * Note that in violation of the standard, an implicit SAVE POINTERS operation |
| 195 | * is done, since some BROKEN disks fail to issue an explicit SAVE POINTERS. |
| 196 | */ |
| 197 | |
| 198 | /* |
| 199 | * Using this file : |
| 200 | * This file a skeleton Linux SCSI driver for the NCR 5380 series |
| 201 | * of chips. To use it, you write an architecture specific functions |
| 202 | * and macros and include this file in your driver. |
| 203 | * |
| 204 | * These macros control options : |
| 205 | * AUTOSENSE - if defined, REQUEST SENSE will be performed automatically |
| 206 | * for commands that return with a CHECK CONDITION status. |
| 207 | * |
| 208 | * LINKED - if defined, linked commands are supported. |
| 209 | * |
| 210 | * REAL_DMA - if defined, REAL DMA is used during the data transfer phases. |
| 211 | * |
| 212 | * SUPPORT_TAGS - if defined, SCSI-2 tagged queuing is used where possible |
| 213 | * |
| 214 | * These macros MUST be defined : |
| 215 | * |
| 216 | * NCR5380_read(register) - read from the specified register |
| 217 | * |
| 218 | * NCR5380_write(register, value) - write to the specific register |
| 219 | * |
| 220 | * Either real DMA *or* pseudo DMA may be implemented |
| 221 | * REAL functions : |
| 222 | * NCR5380_REAL_DMA should be defined if real DMA is to be used. |
| 223 | * Note that the DMA setup functions should return the number of bytes |
| 224 | * that they were able to program the controller for. |
| 225 | * |
| 226 | * Also note that generic i386/PC versions of these macros are |
| 227 | * available as NCR5380_i386_dma_write_setup, |
| 228 | * NCR5380_i386_dma_read_setup, and NCR5380_i386_dma_residual. |
| 229 | * |
| 230 | * NCR5380_dma_write_setup(instance, src, count) - initialize |
| 231 | * NCR5380_dma_read_setup(instance, dst, count) - initialize |
| 232 | * NCR5380_dma_residual(instance); - residual count |
| 233 | * |
| 234 | * PSEUDO functions : |
| 235 | * NCR5380_pwrite(instance, src, count) |
| 236 | * NCR5380_pread(instance, dst, count); |
| 237 | * |
| 238 | * If nothing specific to this implementation needs doing (ie, with external |
| 239 | * hardware), you must also define |
| 240 | * |
| 241 | * NCR5380_queue_command |
| 242 | * NCR5380_reset |
| 243 | * NCR5380_abort |
| 244 | * NCR5380_proc_info |
| 245 | * |
| 246 | * to be the global entry points into the specific driver, ie |
| 247 | * #define NCR5380_queue_command t128_queue_command. |
| 248 | * |
| 249 | * If this is not done, the routines will be defined as static functions |
| 250 | * with the NCR5380* names and the user must provide a globally |
| 251 | * accessible wrapper function. |
| 252 | * |
| 253 | * The generic driver is initialized by calling NCR5380_init(instance), |
| 254 | * after setting the appropriate host specific fields and ID. If the |
| 255 | * driver wishes to autoprobe for an IRQ line, the NCR5380_probe_irq(instance, |
| 256 | * possible) function may be used. Before the specific driver initialization |
| 257 | * code finishes, NCR5380_print_options should be called. |
| 258 | */ |
| 259 | |
| 260 | static struct Scsi_Host *first_instance = NULL; |
Christoph Hellwig | d0be4a7d | 2005-10-31 18:31:40 +0100 | [diff] [blame] | 261 | static struct scsi_host_template *the_template = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | /* Macros ease life... :-) */ |
| 264 | #define SETUP_HOSTDATA(in) \ |
| 265 | struct NCR5380_hostdata *hostdata = \ |
| 266 | (struct NCR5380_hostdata *)(in)->hostdata |
| 267 | #define HOSTDATA(in) ((struct NCR5380_hostdata *)(in)->hostdata) |
| 268 | |
| 269 | #define NEXT(cmd) ((Scsi_Cmnd *)((cmd)->host_scribble)) |
| 270 | #define NEXTADDR(cmd) ((Scsi_Cmnd **)&((cmd)->host_scribble)) |
| 271 | |
| 272 | #define HOSTNO instance->host_no |
| 273 | #define H_NO(cmd) (cmd)->device->host->host_no |
| 274 | |
| 275 | #define SGADDR(buffer) (void *)(((unsigned long)page_address((buffer)->page)) + \ |
| 276 | (buffer)->offset) |
| 277 | |
| 278 | #ifdef SUPPORT_TAGS |
| 279 | |
| 280 | /* |
| 281 | * Functions for handling tagged queuing |
| 282 | * ===================================== |
| 283 | * |
| 284 | * ++roman (01/96): Now I've implemented SCSI-2 tagged queuing. Some notes: |
| 285 | * |
| 286 | * Using consecutive numbers for the tags is no good idea in my eyes. There |
| 287 | * could be wrong re-usings if the counter (8 bit!) wraps and some early |
| 288 | * command has been preempted for a long time. My solution: a bitfield for |
| 289 | * remembering used tags. |
| 290 | * |
| 291 | * There's also the problem that each target has a certain queue size, but we |
| 292 | * cannot know it in advance :-( We just see a QUEUE_FULL status being |
| 293 | * returned. So, in this case, the driver internal queue size assumption is |
| 294 | * reduced to the number of active tags if QUEUE_FULL is returned by the |
| 295 | * target. The command is returned to the mid-level, but with status changed |
| 296 | * to BUSY, since --as I've seen-- the mid-level can't handle QUEUE_FULL |
| 297 | * correctly. |
| 298 | * |
| 299 | * We're also not allowed running tagged commands as long as an untagged |
| 300 | * command is active. And REQUEST SENSE commands after a contingent allegiance |
| 301 | * condition _must_ be untagged. To keep track whether an untagged command has |
| 302 | * been issued, the host->busy array is still employed, as it is without |
| 303 | * support for tagged queuing. |
| 304 | * |
| 305 | * One could suspect that there are possible race conditions between |
| 306 | * is_lun_busy(), cmd_get_tag() and cmd_free_tag(). But I think this isn't the |
| 307 | * case: is_lun_busy() and cmd_get_tag() are both called from NCR5380_main(), |
| 308 | * which already guaranteed to be running at most once. It is also the only |
| 309 | * place where tags/LUNs are allocated. So no other allocation can slip |
| 310 | * between that pair, there could only happen a reselection, which can free a |
| 311 | * tag, but that doesn't hurt. Only the sequence in cmd_free_tag() becomes |
| 312 | * important: the tag bit must be cleared before 'nr_allocated' is decreased. |
| 313 | */ |
| 314 | |
| 315 | /* -1 for TAG_NONE is not possible with unsigned char cmd->tag */ |
| 316 | #undef TAG_NONE |
| 317 | #define TAG_NONE 0xff |
| 318 | |
| 319 | /* For the m68k, the number of bits in 'allocated' must be a multiple of 32! */ |
| 320 | #if (MAX_TAGS % 32) != 0 |
| 321 | #error "MAX_TAGS must be a multiple of 32!" |
| 322 | #endif |
| 323 | |
| 324 | typedef struct { |
| 325 | char allocated[MAX_TAGS/8]; |
| 326 | int nr_allocated; |
| 327 | int queue_size; |
| 328 | } TAG_ALLOC; |
| 329 | |
| 330 | static TAG_ALLOC TagAlloc[8][8]; /* 8 targets and 8 LUNs */ |
| 331 | |
| 332 | |
| 333 | static void __init init_tags( void ) |
| 334 | { |
| 335 | int target, lun; |
| 336 | TAG_ALLOC *ta; |
| 337 | |
| 338 | if (!setup_use_tagged_queuing) |
| 339 | return; |
| 340 | |
| 341 | for( target = 0; target < 8; ++target ) { |
| 342 | for( lun = 0; lun < 8; ++lun ) { |
| 343 | ta = &TagAlloc[target][lun]; |
| 344 | memset( &ta->allocated, 0, MAX_TAGS/8 ); |
| 345 | ta->nr_allocated = 0; |
| 346 | /* At the beginning, assume the maximum queue size we could |
| 347 | * support (MAX_TAGS). This value will be decreased if the target |
| 348 | * returns QUEUE_FULL status. |
| 349 | */ |
| 350 | ta->queue_size = MAX_TAGS; |
| 351 | } |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | |
| 356 | /* Check if we can issue a command to this LUN: First see if the LUN is marked |
| 357 | * busy by an untagged command. If the command should use tagged queuing, also |
| 358 | * check that there is a free tag and the target's queue won't overflow. This |
| 359 | * function should be called with interrupts disabled to avoid race |
| 360 | * conditions. |
| 361 | */ |
| 362 | |
| 363 | static int is_lun_busy( Scsi_Cmnd *cmd, int should_be_tagged ) |
| 364 | { |
| 365 | SETUP_HOSTDATA(cmd->device->host); |
| 366 | |
| 367 | if (hostdata->busy[cmd->device->id] & (1 << cmd->device->lun)) |
| 368 | return( 1 ); |
| 369 | if (!should_be_tagged || |
| 370 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) |
| 371 | return( 0 ); |
| 372 | if (TagAlloc[cmd->device->id][cmd->device->lun].nr_allocated >= |
| 373 | TagAlloc[cmd->device->id][cmd->device->lun].queue_size ) { |
| 374 | TAG_PRINTK( "scsi%d: target %d lun %d: no free tags\n", |
| 375 | H_NO(cmd), cmd->device->id, cmd->device->lun ); |
| 376 | return( 1 ); |
| 377 | } |
| 378 | return( 0 ); |
| 379 | } |
| 380 | |
| 381 | |
| 382 | /* Allocate a tag for a command (there are no checks anymore, check_lun_busy() |
| 383 | * must be called before!), or reserve the LUN in 'busy' if the command is |
| 384 | * untagged. |
| 385 | */ |
| 386 | |
| 387 | static void cmd_get_tag( Scsi_Cmnd *cmd, int should_be_tagged ) |
| 388 | { |
| 389 | SETUP_HOSTDATA(cmd->device->host); |
| 390 | |
| 391 | /* If we or the target don't support tagged queuing, allocate the LUN for |
| 392 | * an untagged command. |
| 393 | */ |
| 394 | if (!should_be_tagged || |
| 395 | !setup_use_tagged_queuing || !cmd->device->tagged_supported) { |
| 396 | cmd->tag = TAG_NONE; |
| 397 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| 398 | TAG_PRINTK( "scsi%d: target %d lun %d now allocated by untagged " |
| 399 | "command\n", H_NO(cmd), cmd->device->id, cmd->device->lun ); |
| 400 | } |
| 401 | else { |
| 402 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| 403 | |
| 404 | cmd->tag = find_first_zero_bit( &ta->allocated, MAX_TAGS ); |
| 405 | set_bit( cmd->tag, &ta->allocated ); |
| 406 | ta->nr_allocated++; |
| 407 | TAG_PRINTK( "scsi%d: using tag %d for target %d lun %d " |
| 408 | "(now %d tags in use)\n", |
| 409 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun, |
| 410 | ta->nr_allocated ); |
| 411 | } |
| 412 | } |
| 413 | |
| 414 | |
| 415 | /* Mark the tag of command 'cmd' as free, or in case of an untagged command, |
| 416 | * unlock the LUN. |
| 417 | */ |
| 418 | |
| 419 | static void cmd_free_tag( Scsi_Cmnd *cmd ) |
| 420 | { |
| 421 | SETUP_HOSTDATA(cmd->device->host); |
| 422 | |
| 423 | if (cmd->tag == TAG_NONE) { |
| 424 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 425 | TAG_PRINTK( "scsi%d: target %d lun %d untagged cmd finished\n", |
| 426 | H_NO(cmd), cmd->device->id, cmd->device->lun ); |
| 427 | } |
| 428 | else if (cmd->tag >= MAX_TAGS) { |
| 429 | printk(KERN_NOTICE "scsi%d: trying to free bad tag %d!\n", |
| 430 | H_NO(cmd), cmd->tag ); |
| 431 | } |
| 432 | else { |
| 433 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| 434 | clear_bit( cmd->tag, &ta->allocated ); |
| 435 | ta->nr_allocated--; |
| 436 | TAG_PRINTK( "scsi%d: freed tag %d for target %d lun %d\n", |
| 437 | H_NO(cmd), cmd->tag, cmd->device->id, cmd->device->lun ); |
| 438 | } |
| 439 | } |
| 440 | |
| 441 | |
| 442 | static void free_all_tags( void ) |
| 443 | { |
| 444 | int target, lun; |
| 445 | TAG_ALLOC *ta; |
| 446 | |
| 447 | if (!setup_use_tagged_queuing) |
| 448 | return; |
| 449 | |
| 450 | for( target = 0; target < 8; ++target ) { |
| 451 | for( lun = 0; lun < 8; ++lun ) { |
| 452 | ta = &TagAlloc[target][lun]; |
| 453 | memset( &ta->allocated, 0, MAX_TAGS/8 ); |
| 454 | ta->nr_allocated = 0; |
| 455 | } |
| 456 | } |
| 457 | } |
| 458 | |
| 459 | #endif /* SUPPORT_TAGS */ |
| 460 | |
| 461 | |
| 462 | /* |
| 463 | * Function: void merge_contiguous_buffers( Scsi_Cmnd *cmd ) |
| 464 | * |
| 465 | * Purpose: Try to merge several scatter-gather requests into one DMA |
| 466 | * transfer. This is possible if the scatter buffers lie on |
| 467 | * physical contiguous addresses. |
| 468 | * |
| 469 | * Parameters: Scsi_Cmnd *cmd |
| 470 | * The command to work on. The first scatter buffer's data are |
| 471 | * assumed to be already transfered into ptr/this_residual. |
| 472 | */ |
| 473 | |
| 474 | static void merge_contiguous_buffers( Scsi_Cmnd *cmd ) |
| 475 | { |
| 476 | unsigned long endaddr; |
| 477 | #if (NDEBUG & NDEBUG_MERGING) |
| 478 | unsigned long oldlen = cmd->SCp.this_residual; |
| 479 | int cnt = 1; |
| 480 | #endif |
| 481 | |
| 482 | for (endaddr = virt_to_phys(cmd->SCp.ptr + cmd->SCp.this_residual - 1) + 1; |
| 483 | cmd->SCp.buffers_residual && |
| 484 | virt_to_phys(SGADDR(&(cmd->SCp.buffer[1]))) == endaddr; ) { |
| 485 | |
| 486 | MER_PRINTK("VTOP(%p) == %08lx -> merging\n", |
| 487 | SGADDR(&(cmd->SCp.buffer[1])), endaddr); |
| 488 | #if (NDEBUG & NDEBUG_MERGING) |
| 489 | ++cnt; |
| 490 | #endif |
| 491 | ++cmd->SCp.buffer; |
| 492 | --cmd->SCp.buffers_residual; |
| 493 | cmd->SCp.this_residual += cmd->SCp.buffer->length; |
| 494 | endaddr += cmd->SCp.buffer->length; |
| 495 | } |
| 496 | #if (NDEBUG & NDEBUG_MERGING) |
| 497 | if (oldlen != cmd->SCp.this_residual) |
| 498 | MER_PRINTK("merged %d buffers from %p, new length %08x\n", |
| 499 | cnt, cmd->SCp.ptr, cmd->SCp.this_residual); |
| 500 | #endif |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * Function : void initialize_SCp(Scsi_Cmnd *cmd) |
| 505 | * |
| 506 | * Purpose : initialize the saved data pointers for cmd to point to the |
| 507 | * start of the buffer. |
| 508 | * |
| 509 | * Inputs : cmd - Scsi_Cmnd structure to have pointers reset. |
| 510 | */ |
| 511 | |
| 512 | static __inline__ void initialize_SCp(Scsi_Cmnd *cmd) |
| 513 | { |
| 514 | /* |
| 515 | * Initialize the Scsi Pointer field so that all of the commands in the |
| 516 | * various queues are valid. |
| 517 | */ |
| 518 | |
| 519 | if (cmd->use_sg) { |
Christoph Hellwig | 79bd3f8 | 2006-07-14 10:29:34 +0200 | [diff] [blame] | 520 | cmd->SCp.buffer = (struct scatterlist *) cmd->request_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | cmd->SCp.buffers_residual = cmd->use_sg - 1; |
| 522 | cmd->SCp.ptr = (char *) SGADDR(cmd->SCp.buffer); |
| 523 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| 524 | |
| 525 | /* ++roman: Try to merge some scatter-buffers if they are at |
| 526 | * contiguous physical addresses. |
| 527 | */ |
| 528 | // merge_contiguous_buffers( cmd ); |
| 529 | } else { |
| 530 | cmd->SCp.buffer = NULL; |
| 531 | cmd->SCp.buffers_residual = 0; |
| 532 | cmd->SCp.ptr = (char *) cmd->request_buffer; |
| 533 | cmd->SCp.this_residual = cmd->request_bufflen; |
| 534 | } |
| 535 | |
| 536 | } |
| 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | #include <linux/delay.h> |
| 539 | |
| 540 | #if 1 |
| 541 | static struct { |
| 542 | unsigned char mask; |
| 543 | const char * name;} |
| 544 | signals[] = {{ SR_DBP, "PARITY"}, { SR_RST, "RST" }, { SR_BSY, "BSY" }, |
| 545 | { SR_REQ, "REQ" }, { SR_MSG, "MSG" }, { SR_CD, "CD" }, { SR_IO, "IO" }, |
| 546 | { SR_SEL, "SEL" }, {0, NULL}}, |
| 547 | basrs[] = {{BASR_ATN, "ATN"}, {BASR_ACK, "ACK"}, {0, NULL}}, |
| 548 | icrs[] = {{ICR_ASSERT_RST, "ASSERT RST"},{ICR_ASSERT_ACK, "ASSERT ACK"}, |
| 549 | {ICR_ASSERT_BSY, "ASSERT BSY"}, {ICR_ASSERT_SEL, "ASSERT SEL"}, |
| 550 | {ICR_ASSERT_ATN, "ASSERT ATN"}, {ICR_ASSERT_DATA, "ASSERT DATA"}, |
| 551 | {0, NULL}}, |
| 552 | mrs[] = {{MR_BLOCK_DMA_MODE, "MODE BLOCK DMA"}, {MR_TARGET, "MODE TARGET"}, |
| 553 | {MR_ENABLE_PAR_CHECK, "MODE PARITY CHECK"}, {MR_ENABLE_PAR_INTR, |
| 554 | "MODE PARITY INTR"}, {MR_ENABLE_EOP_INTR,"MODE EOP INTR"}, |
| 555 | {MR_MONITOR_BSY, "MODE MONITOR BSY"}, |
| 556 | {MR_DMA_MODE, "MODE DMA"}, {MR_ARBITRATE, "MODE ARBITRATION"}, |
| 557 | {0, NULL}}; |
| 558 | |
| 559 | /* |
| 560 | * Function : void NCR5380_print(struct Scsi_Host *instance) |
| 561 | * |
| 562 | * Purpose : print the SCSI bus signals for debugging purposes |
| 563 | * |
| 564 | * Input : instance - which NCR5380 |
| 565 | */ |
| 566 | |
| 567 | static void NCR5380_print(struct Scsi_Host *instance) { |
| 568 | unsigned char status, data, basr, mr, icr, i; |
| 569 | unsigned long flags; |
| 570 | |
| 571 | local_irq_save(flags); |
| 572 | data = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| 573 | status = NCR5380_read(STATUS_REG); |
| 574 | mr = NCR5380_read(MODE_REG); |
| 575 | icr = NCR5380_read(INITIATOR_COMMAND_REG); |
| 576 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
| 577 | local_irq_restore(flags); |
| 578 | printk("STATUS_REG: %02x ", status); |
| 579 | for (i = 0; signals[i].mask ; ++i) |
| 580 | if (status & signals[i].mask) |
| 581 | printk(",%s", signals[i].name); |
| 582 | printk("\nBASR: %02x ", basr); |
| 583 | for (i = 0; basrs[i].mask ; ++i) |
| 584 | if (basr & basrs[i].mask) |
| 585 | printk(",%s", basrs[i].name); |
| 586 | printk("\nICR: %02x ", icr); |
| 587 | for (i = 0; icrs[i].mask; ++i) |
| 588 | if (icr & icrs[i].mask) |
| 589 | printk(",%s", icrs[i].name); |
| 590 | printk("\nMODE: %02x ", mr); |
| 591 | for (i = 0; mrs[i].mask; ++i) |
| 592 | if (mr & mrs[i].mask) |
| 593 | printk(",%s", mrs[i].name); |
| 594 | printk("\n"); |
| 595 | } |
| 596 | |
| 597 | static struct { |
| 598 | unsigned char value; |
| 599 | const char *name; |
| 600 | } phases[] = { |
| 601 | {PHASE_DATAOUT, "DATAOUT"}, {PHASE_DATAIN, "DATAIN"}, {PHASE_CMDOUT, "CMDOUT"}, |
| 602 | {PHASE_STATIN, "STATIN"}, {PHASE_MSGOUT, "MSGOUT"}, {PHASE_MSGIN, "MSGIN"}, |
| 603 | {PHASE_UNKNOWN, "UNKNOWN"}}; |
| 604 | |
| 605 | /* |
| 606 | * Function : void NCR5380_print_phase(struct Scsi_Host *instance) |
| 607 | * |
| 608 | * Purpose : print the current SCSI phase for debugging purposes |
| 609 | * |
| 610 | * Input : instance - which NCR5380 |
| 611 | */ |
| 612 | |
| 613 | static void NCR5380_print_phase(struct Scsi_Host *instance) |
| 614 | { |
| 615 | unsigned char status; |
| 616 | int i; |
| 617 | |
| 618 | status = NCR5380_read(STATUS_REG); |
| 619 | if (!(status & SR_REQ)) |
| 620 | printk(KERN_DEBUG "scsi%d: REQ not asserted, phase unknown.\n", HOSTNO); |
| 621 | else { |
| 622 | for (i = 0; (phases[i].value != PHASE_UNKNOWN) && |
| 623 | (phases[i].value != (status & PHASE_MASK)); ++i); |
| 624 | printk(KERN_DEBUG "scsi%d: phase %s\n", HOSTNO, phases[i].name); |
| 625 | } |
| 626 | } |
| 627 | |
| 628 | #else /* !NDEBUG */ |
| 629 | |
| 630 | /* dummies... */ |
| 631 | __inline__ void NCR5380_print(struct Scsi_Host *instance) { }; |
| 632 | __inline__ void NCR5380_print_phase(struct Scsi_Host *instance) { }; |
| 633 | |
| 634 | #endif |
| 635 | |
| 636 | /* |
| 637 | * ++roman: New scheme of calling NCR5380_main() |
| 638 | * |
| 639 | * If we're not in an interrupt, we can call our main directly, it cannot be |
| 640 | * already running. Else, we queue it on a task queue, if not 'main_running' |
| 641 | * tells us that a lower level is already executing it. This way, |
| 642 | * 'main_running' needs not be protected in a special way. |
| 643 | * |
| 644 | * queue_main() is a utility function for putting our main onto the task |
| 645 | * queue, if main_running is false. It should be called only from a |
| 646 | * interrupt or bottom half. |
| 647 | */ |
| 648 | |
| 649 | #include <linux/workqueue.h> |
| 650 | #include <linux/interrupt.h> |
| 651 | |
| 652 | static volatile int main_running = 0; |
| 653 | static DECLARE_WORK(NCR5380_tqueue, (void (*)(void*))NCR5380_main, NULL); |
| 654 | |
| 655 | static __inline__ void queue_main(void) |
| 656 | { |
| 657 | if (!main_running) { |
| 658 | /* If in interrupt and NCR5380_main() not already running, |
| 659 | queue it on the 'immediate' task queue, to be processed |
| 660 | immediately after the current interrupt processing has |
| 661 | finished. */ |
| 662 | schedule_work(&NCR5380_tqueue); |
| 663 | } |
| 664 | /* else: nothing to do: the running NCR5380_main() will pick up |
| 665 | any newly queued command. */ |
| 666 | } |
| 667 | |
| 668 | |
| 669 | static inline void NCR5380_all_init (void) |
| 670 | { |
| 671 | static int done = 0; |
| 672 | if (!done) { |
| 673 | INI_PRINTK("scsi : NCR5380_all_init()\n"); |
| 674 | done = 1; |
| 675 | } |
| 676 | } |
| 677 | |
| 678 | |
| 679 | /* |
| 680 | * Function : void NCR58380_print_options (struct Scsi_Host *instance) |
| 681 | * |
| 682 | * Purpose : called by probe code indicating the NCR5380 driver |
| 683 | * options that were selected. |
| 684 | * |
| 685 | * Inputs : instance, pointer to this instance. Unused. |
| 686 | */ |
| 687 | |
| 688 | static void __init NCR5380_print_options (struct Scsi_Host *instance) |
| 689 | { |
| 690 | printk(" generic options" |
| 691 | #ifdef AUTOSENSE |
| 692 | " AUTOSENSE" |
| 693 | #endif |
| 694 | #ifdef REAL_DMA |
| 695 | " REAL DMA" |
| 696 | #endif |
| 697 | #ifdef PARITY |
| 698 | " PARITY" |
| 699 | #endif |
| 700 | #ifdef SUPPORT_TAGS |
| 701 | " SCSI-2 TAGGED QUEUING" |
| 702 | #endif |
| 703 | ); |
| 704 | printk(" generic release=%d", NCR5380_PUBLIC_RELEASE); |
| 705 | } |
| 706 | |
| 707 | /* |
| 708 | * Function : void NCR5380_print_status (struct Scsi_Host *instance) |
| 709 | * |
| 710 | * Purpose : print commands in the various queues, called from |
| 711 | * NCR5380_abort and NCR5380_debug to aid debugging. |
| 712 | * |
| 713 | * Inputs : instance, pointer to this instance. |
| 714 | */ |
| 715 | |
| 716 | static void NCR5380_print_status (struct Scsi_Host *instance) |
| 717 | { |
| 718 | char *pr_bfr; |
| 719 | char *start; |
| 720 | int len; |
| 721 | |
| 722 | NCR_PRINT(NDEBUG_ANY); |
| 723 | NCR_PRINT_PHASE(NDEBUG_ANY); |
| 724 | |
| 725 | pr_bfr = (char *) __get_free_page(GFP_ATOMIC); |
| 726 | if (!pr_bfr) { |
| 727 | printk("NCR5380_print_status: no memory for print buffer\n"); |
| 728 | return; |
| 729 | } |
| 730 | len = NCR5380_proc_info(instance, pr_bfr, &start, 0, PAGE_SIZE, 0); |
| 731 | pr_bfr[len] = 0; |
| 732 | printk("\n%s\n", pr_bfr); |
| 733 | free_page((unsigned long) pr_bfr); |
| 734 | } |
| 735 | |
| 736 | |
| 737 | /******************************************/ |
| 738 | /* |
| 739 | * /proc/scsi/[dtc pas16 t128 generic]/[0-ASC_NUM_BOARD_SUPPORTED] |
| 740 | * |
| 741 | * *buffer: I/O buffer |
| 742 | * **start: if inout == FALSE pointer into buffer where user read should start |
| 743 | * offset: current offset |
| 744 | * length: length of buffer |
| 745 | * hostno: Scsi_Host host_no |
| 746 | * inout: TRUE - user is writing; FALSE - user is reading |
| 747 | * |
| 748 | * Return the number of bytes read from or written |
| 749 | */ |
| 750 | |
| 751 | #undef SPRINTF |
| 752 | #define SPRINTF(fmt,args...) \ |
| 753 | do { if (pos + strlen(fmt) + 20 /* slop */ < buffer + length) \ |
| 754 | pos += sprintf(pos, fmt , ## args); } while(0) |
| 755 | static |
| 756 | char *lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length); |
| 757 | |
| 758 | static int NCR5380_proc_info (struct Scsi_Host *instance, char *buffer, char **start, |
| 759 | off_t offset, int length, int inout) |
| 760 | { |
| 761 | char *pos = buffer; |
| 762 | struct NCR5380_hostdata *hostdata; |
| 763 | Scsi_Cmnd *ptr; |
| 764 | unsigned long flags; |
| 765 | off_t begin = 0; |
| 766 | #define check_offset() \ |
| 767 | do { \ |
| 768 | if (pos - buffer < offset - begin) { \ |
| 769 | begin += pos - buffer; \ |
| 770 | pos = buffer; \ |
| 771 | } \ |
| 772 | } while (0) |
| 773 | |
| 774 | hostdata = (struct NCR5380_hostdata *)instance->hostdata; |
| 775 | |
| 776 | if (inout) { /* Has data been written to the file ? */ |
| 777 | return(-ENOSYS); /* Currently this is a no-op */ |
| 778 | } |
| 779 | SPRINTF("NCR5380 core release=%d.\n", NCR5380_PUBLIC_RELEASE); |
| 780 | check_offset(); |
| 781 | local_irq_save(flags); |
| 782 | SPRINTF("NCR5380: coroutine is%s running.\n", main_running ? "" : "n't"); |
| 783 | check_offset(); |
| 784 | if (!hostdata->connected) |
| 785 | SPRINTF("scsi%d: no currently connected command\n", HOSTNO); |
| 786 | else |
| 787 | pos = lprint_Scsi_Cmnd ((Scsi_Cmnd *) hostdata->connected, |
| 788 | pos, buffer, length); |
| 789 | SPRINTF("scsi%d: issue_queue\n", HOSTNO); |
| 790 | check_offset(); |
| 791 | for (ptr = (Scsi_Cmnd *) hostdata->issue_queue; ptr; ptr = NEXT(ptr)) { |
| 792 | pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); |
| 793 | check_offset(); |
| 794 | } |
| 795 | |
| 796 | SPRINTF("scsi%d: disconnected_queue\n", HOSTNO); |
| 797 | check_offset(); |
| 798 | for (ptr = (Scsi_Cmnd *) hostdata->disconnected_queue; ptr; |
| 799 | ptr = NEXT(ptr)) { |
| 800 | pos = lprint_Scsi_Cmnd (ptr, pos, buffer, length); |
| 801 | check_offset(); |
| 802 | } |
| 803 | |
| 804 | local_irq_restore(flags); |
| 805 | *start = buffer + (offset - begin); |
| 806 | if (pos - buffer < offset - begin) |
| 807 | return 0; |
| 808 | else if (pos - buffer - (offset - begin) < length) |
| 809 | return pos - buffer - (offset - begin); |
| 810 | return length; |
| 811 | } |
| 812 | |
| 813 | static char * |
| 814 | lprint_Scsi_Cmnd (Scsi_Cmnd *cmd, char *pos, char *buffer, int length) |
| 815 | { |
| 816 | int i, s; |
| 817 | unsigned char *command; |
| 818 | SPRINTF("scsi%d: destination target %d, lun %d\n", |
| 819 | H_NO(cmd), cmd->device->id, cmd->device->lun); |
| 820 | SPRINTF(" command = "); |
| 821 | command = cmd->cmnd; |
| 822 | SPRINTF("%2d (0x%02x)", command[0], command[0]); |
| 823 | for (i = 1, s = COMMAND_SIZE(command[0]); i < s; ++i) |
| 824 | SPRINTF(" %02x", command[i]); |
| 825 | SPRINTF("\n"); |
| 826 | return pos; |
| 827 | } |
| 828 | |
| 829 | |
| 830 | /* |
| 831 | * Function : void NCR5380_init (struct Scsi_Host *instance) |
| 832 | * |
| 833 | * Purpose : initializes *instance and corresponding 5380 chip. |
| 834 | * |
| 835 | * Inputs : instance - instantiation of the 5380 driver. |
| 836 | * |
| 837 | * Notes : I assume that the host, hostno, and id bits have been |
| 838 | * set correctly. I don't care about the irq and other fields. |
| 839 | * |
| 840 | */ |
| 841 | |
| 842 | static int NCR5380_init (struct Scsi_Host *instance, int flags) |
| 843 | { |
| 844 | int i; |
| 845 | SETUP_HOSTDATA(instance); |
| 846 | |
| 847 | NCR5380_all_init(); |
| 848 | |
| 849 | hostdata->aborted = 0; |
| 850 | hostdata->id_mask = 1 << instance->this_id; |
| 851 | hostdata->id_higher_mask = 0; |
| 852 | for (i = hostdata->id_mask; i <= 0x80; i <<= 1) |
| 853 | if (i > hostdata->id_mask) |
| 854 | hostdata->id_higher_mask |= i; |
| 855 | for (i = 0; i < 8; ++i) |
| 856 | hostdata->busy[i] = 0; |
| 857 | #ifdef SUPPORT_TAGS |
| 858 | init_tags(); |
| 859 | #endif |
| 860 | #if defined (REAL_DMA) |
| 861 | hostdata->dma_len = 0; |
| 862 | #endif |
| 863 | hostdata->targets_present = 0; |
| 864 | hostdata->connected = NULL; |
| 865 | hostdata->issue_queue = NULL; |
| 866 | hostdata->disconnected_queue = NULL; |
| 867 | hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT; |
| 868 | |
| 869 | if (!the_template) { |
| 870 | the_template = instance->hostt; |
| 871 | first_instance = instance; |
| 872 | } |
| 873 | |
| 874 | |
| 875 | #ifndef AUTOSENSE |
| 876 | if ((instance->cmd_per_lun > 1) || (instance->can_queue > 1)) |
| 877 | printk("scsi%d: WARNING : support for multiple outstanding commands enabled\n" |
| 878 | " without AUTOSENSE option, contingent allegiance conditions may\n" |
| 879 | " be incorrectly cleared.\n", HOSTNO); |
| 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 | return 0; |
| 888 | } |
| 889 | |
| 890 | /* |
| 891 | * Function : int NCR5380_queue_command (Scsi_Cmnd *cmd, |
| 892 | * void (*done)(Scsi_Cmnd *)) |
| 893 | * |
| 894 | * Purpose : enqueues a SCSI command |
| 895 | * |
| 896 | * Inputs : cmd - SCSI command, done - function called on completion, with |
| 897 | * a pointer to the command descriptor. |
| 898 | * |
| 899 | * Returns : 0 |
| 900 | * |
| 901 | * Side effects : |
| 902 | * cmd is added to the per instance issue_queue, with minor |
| 903 | * twiddling done to the host specific fields of cmd. If the |
| 904 | * main coroutine is not running, it is restarted. |
| 905 | * |
| 906 | */ |
| 907 | |
| 908 | /* Only make static if a wrapper function is used */ |
| 909 | static int NCR5380_queue_command (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *)) |
| 910 | { |
| 911 | SETUP_HOSTDATA(cmd->device->host); |
| 912 | Scsi_Cmnd *tmp; |
| 913 | unsigned long flags; |
| 914 | |
| 915 | #if (NDEBUG & NDEBUG_NO_WRITE) |
| 916 | switch (cmd->cmnd[0]) { |
| 917 | case WRITE_6: |
| 918 | case WRITE_10: |
| 919 | printk(KERN_NOTICE "scsi%d: WRITE attempted with NO_WRITE debugging flag set\n", |
| 920 | H_NO(cmd)); |
| 921 | cmd->result = (DID_ERROR << 16); |
| 922 | done(cmd); |
| 923 | return 0; |
| 924 | } |
| 925 | #endif /* (NDEBUG & NDEBUG_NO_WRITE) */ |
| 926 | |
| 927 | |
| 928 | #ifdef NCR5380_STATS |
| 929 | # if 0 |
| 930 | if (!hostdata->connected && !hostdata->issue_queue && |
| 931 | !hostdata->disconnected_queue) { |
| 932 | hostdata->timebase = jiffies; |
| 933 | } |
| 934 | # endif |
| 935 | # ifdef NCR5380_STAT_LIMIT |
| 936 | if (cmd->request_bufflen > NCR5380_STAT_LIMIT) |
| 937 | # endif |
| 938 | switch (cmd->cmnd[0]) |
| 939 | { |
| 940 | case WRITE: |
| 941 | case WRITE_6: |
| 942 | case WRITE_10: |
| 943 | hostdata->time_write[cmd->device->id] -= (jiffies - hostdata->timebase); |
| 944 | hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen; |
| 945 | hostdata->pendingw++; |
| 946 | break; |
| 947 | case READ: |
| 948 | case READ_6: |
| 949 | case READ_10: |
| 950 | hostdata->time_read[cmd->device->id] -= (jiffies - hostdata->timebase); |
| 951 | hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen; |
| 952 | hostdata->pendingr++; |
| 953 | break; |
| 954 | } |
| 955 | #endif |
| 956 | |
| 957 | /* |
| 958 | * We use the host_scribble field as a pointer to the next command |
| 959 | * in a queue |
| 960 | */ |
| 961 | |
| 962 | NEXT(cmd) = NULL; |
| 963 | cmd->scsi_done = done; |
| 964 | |
| 965 | cmd->result = 0; |
| 966 | |
| 967 | |
| 968 | /* |
| 969 | * Insert the cmd into the issue queue. Note that REQUEST SENSE |
| 970 | * commands are added to the head of the queue since any command will |
| 971 | * clear the contingent allegiance condition that exists and the |
| 972 | * sense data is only guaranteed to be valid while the condition exists. |
| 973 | */ |
| 974 | |
| 975 | local_irq_save(flags); |
| 976 | /* ++guenther: now that the issue queue is being set up, we can lock ST-DMA. |
| 977 | * Otherwise a running NCR5380_main may steal the lock. |
| 978 | * Lock before actually inserting due to fairness reasons explained in |
| 979 | * atari_scsi.c. If we insert first, then it's impossible for this driver |
| 980 | * to release the lock. |
| 981 | * Stop timer for this command while waiting for the lock, or timeouts |
| 982 | * may happen (and they really do), and it's no good if the command doesn't |
| 983 | * appear in any of the queues. |
| 984 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
| 985 | * because also a timer int can trigger an abort or reset, which would |
| 986 | * alter queues and touch the lock. |
| 987 | */ |
| 988 | if (!(hostdata->issue_queue) || (cmd->cmnd[0] == REQUEST_SENSE)) { |
| 989 | LIST(cmd, hostdata->issue_queue); |
| 990 | NEXT(cmd) = hostdata->issue_queue; |
| 991 | hostdata->issue_queue = cmd; |
| 992 | } else { |
| 993 | for (tmp = (Scsi_Cmnd *)hostdata->issue_queue; |
| 994 | NEXT(tmp); tmp = NEXT(tmp)) |
| 995 | ; |
| 996 | LIST(cmd, tmp); |
| 997 | NEXT(tmp) = cmd; |
| 998 | } |
| 999 | |
| 1000 | local_irq_restore(flags); |
| 1001 | |
| 1002 | QU_PRINTK("scsi%d: command added to %s of queue\n", H_NO(cmd), |
| 1003 | (cmd->cmnd[0] == REQUEST_SENSE) ? "head" : "tail"); |
| 1004 | |
| 1005 | /* If queue_command() is called from an interrupt (real one or bottom |
| 1006 | * half), we let queue_main() do the job of taking care about main. If it |
| 1007 | * is already running, this is a no-op, else main will be queued. |
| 1008 | * |
| 1009 | * If we're not in an interrupt, we can call NCR5380_main() |
| 1010 | * unconditionally, because it cannot be already running. |
| 1011 | */ |
| 1012 | if (in_interrupt() || ((flags >> 8) & 7) >= 6) |
| 1013 | queue_main(); |
| 1014 | else |
| 1015 | NCR5380_main(NULL); |
| 1016 | return 0; |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * Function : NCR5380_main (void) |
| 1021 | * |
| 1022 | * Purpose : NCR5380_main is a coroutine that runs as long as more work can |
| 1023 | * be done on the NCR5380 host adapters in a system. Both |
| 1024 | * NCR5380_queue_command() and NCR5380_intr() will try to start it |
| 1025 | * in case it is not running. |
| 1026 | * |
| 1027 | * NOTE : NCR5380_main exits with interrupts *disabled*, the caller should |
| 1028 | * reenable them. This prevents reentrancy and kernel stack overflow. |
| 1029 | */ |
| 1030 | |
| 1031 | static void NCR5380_main (void *bl) |
| 1032 | { |
| 1033 | Scsi_Cmnd *tmp, *prev; |
| 1034 | struct Scsi_Host *instance = first_instance; |
| 1035 | struct NCR5380_hostdata *hostdata = HOSTDATA(instance); |
| 1036 | int done; |
| 1037 | unsigned long flags; |
| 1038 | |
| 1039 | /* |
| 1040 | * We run (with interrupts disabled) until we're sure that none of |
| 1041 | * the host adapters have anything that can be done, at which point |
| 1042 | * we set main_running to 0 and exit. |
| 1043 | * |
| 1044 | * Interrupts are enabled before doing various other internal |
| 1045 | * instructions, after we've decided that we need to run through |
| 1046 | * the loop again. |
| 1047 | * |
| 1048 | * this should prevent any race conditions. |
| 1049 | * |
| 1050 | * ++roman: Just disabling the NCR interrupt isn't sufficient here, |
| 1051 | * because also a timer int can trigger an abort or reset, which can |
| 1052 | * alter queues and touch the Falcon lock. |
| 1053 | */ |
| 1054 | |
| 1055 | /* Tell int handlers main() is now already executing. Note that |
| 1056 | no races are possible here. If an int comes in before |
| 1057 | 'main_running' is set here, and queues/executes main via the |
| 1058 | task queue, it doesn't do any harm, just this instance of main |
| 1059 | won't find any work left to do. */ |
| 1060 | if (main_running) |
| 1061 | return; |
| 1062 | main_running = 1; |
| 1063 | |
| 1064 | local_save_flags(flags); |
| 1065 | do { |
| 1066 | local_irq_disable(); /* Freeze request queues */ |
| 1067 | done = 1; |
| 1068 | |
| 1069 | if (!hostdata->connected) { |
| 1070 | MAIN_PRINTK( "scsi%d: not connected\n", HOSTNO ); |
| 1071 | /* |
| 1072 | * Search through the issue_queue for a command destined |
| 1073 | * for a target that's not busy. |
| 1074 | */ |
| 1075 | #if (NDEBUG & NDEBUG_LISTS) |
| 1076 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, prev = NULL; |
| 1077 | tmp && (tmp != prev); prev = tmp, tmp = NEXT(tmp)) |
| 1078 | ; |
| 1079 | if ((tmp == prev) && tmp) printk(" LOOP\n");/* else printk("\n");*/ |
| 1080 | #endif |
| 1081 | for (tmp = (Scsi_Cmnd *) hostdata->issue_queue, |
| 1082 | prev = NULL; tmp; prev = tmp, tmp = NEXT(tmp) ) { |
| 1083 | |
| 1084 | #if (NDEBUG & NDEBUG_LISTS) |
| 1085 | if (prev != tmp) |
| 1086 | printk("MAIN tmp=%p target=%d busy=%d lun=%d\n", |
| 1087 | tmp, tmp->target, hostdata->busy[tmp->target], |
| 1088 | tmp->lun); |
| 1089 | #endif |
| 1090 | /* When we find one, remove it from the issue queue. */ |
| 1091 | /* ++guenther: possible race with Falcon locking */ |
| 1092 | if ( |
| 1093 | #ifdef SUPPORT_TAGS |
| 1094 | !is_lun_busy( tmp, tmp->cmnd[0] != REQUEST_SENSE) |
| 1095 | #else |
| 1096 | !(hostdata->busy[tmp->device->id] & (1 << tmp->device->lun)) |
| 1097 | #endif |
| 1098 | ) { |
| 1099 | /* ++guenther: just to be sure, this must be atomic */ |
| 1100 | local_irq_disable(); |
| 1101 | if (prev) { |
| 1102 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); |
| 1103 | NEXT(prev) = NEXT(tmp); |
| 1104 | } else { |
| 1105 | REMOVE(-1, hostdata->issue_queue, tmp, NEXT(tmp)); |
| 1106 | hostdata->issue_queue = NEXT(tmp); |
| 1107 | } |
| 1108 | NEXT(tmp) = NULL; |
| 1109 | |
| 1110 | /* reenable interrupts after finding one */ |
| 1111 | local_irq_restore(flags); |
| 1112 | |
| 1113 | /* |
| 1114 | * Attempt to establish an I_T_L nexus here. |
| 1115 | * On success, instance->hostdata->connected is set. |
| 1116 | * On failure, we must add the command back to the |
| 1117 | * issue queue so we can keep trying. |
| 1118 | */ |
| 1119 | MAIN_PRINTK("scsi%d: main(): command for target %d " |
| 1120 | "lun %d removed from issue_queue\n", |
| 1121 | HOSTNO, tmp->target, tmp->lun); |
| 1122 | /* |
| 1123 | * REQUEST SENSE commands are issued without tagged |
| 1124 | * queueing, even on SCSI-II devices because the |
| 1125 | * contingent allegiance condition exists for the |
| 1126 | * entire unit. |
| 1127 | */ |
| 1128 | /* ++roman: ...and the standard also requires that |
| 1129 | * REQUEST SENSE command are untagged. |
| 1130 | */ |
| 1131 | |
| 1132 | #ifdef SUPPORT_TAGS |
| 1133 | cmd_get_tag( tmp, tmp->cmnd[0] != REQUEST_SENSE ); |
| 1134 | #endif |
| 1135 | if (!NCR5380_select(instance, tmp, |
| 1136 | (tmp->cmnd[0] == REQUEST_SENSE) ? TAG_NONE : |
| 1137 | TAG_NEXT)) { |
| 1138 | break; |
| 1139 | } else { |
| 1140 | local_irq_disable(); |
| 1141 | LIST(tmp, hostdata->issue_queue); |
| 1142 | NEXT(tmp) = hostdata->issue_queue; |
| 1143 | hostdata->issue_queue = tmp; |
| 1144 | #ifdef SUPPORT_TAGS |
| 1145 | cmd_free_tag( tmp ); |
| 1146 | #endif |
| 1147 | local_irq_restore(flags); |
| 1148 | MAIN_PRINTK("scsi%d: main(): select() failed, " |
| 1149 | "returned to issue_queue\n", HOSTNO); |
| 1150 | if (hostdata->connected) |
| 1151 | break; |
| 1152 | } |
| 1153 | } /* if target/lun/target queue is not busy */ |
| 1154 | } /* for issue_queue */ |
| 1155 | } /* if (!hostdata->connected) */ |
| 1156 | if (hostdata->connected |
| 1157 | #ifdef REAL_DMA |
| 1158 | && !hostdata->dma_len |
| 1159 | #endif |
| 1160 | ) { |
| 1161 | local_irq_restore(flags); |
| 1162 | MAIN_PRINTK("scsi%d: main: performing information transfer\n", |
| 1163 | HOSTNO); |
| 1164 | NCR5380_information_transfer(instance); |
| 1165 | MAIN_PRINTK("scsi%d: main: done set false\n", HOSTNO); |
| 1166 | done = 0; |
| 1167 | } |
| 1168 | } while (!done); |
| 1169 | |
| 1170 | /* Better allow ints _after_ 'main_running' has been cleared, else |
| 1171 | an interrupt could believe we'll pick up the work it left for |
| 1172 | us, but we won't see it anymore here... */ |
| 1173 | main_running = 0; |
| 1174 | local_irq_restore(flags); |
| 1175 | } |
| 1176 | |
| 1177 | |
| 1178 | #ifdef REAL_DMA |
| 1179 | /* |
| 1180 | * Function : void NCR5380_dma_complete (struct Scsi_Host *instance) |
| 1181 | * |
| 1182 | * Purpose : Called by interrupt handler when DMA finishes or a phase |
| 1183 | * mismatch occurs (which would finish the DMA transfer). |
| 1184 | * |
| 1185 | * Inputs : instance - this instance of the NCR5380. |
| 1186 | * |
| 1187 | */ |
| 1188 | |
| 1189 | static void NCR5380_dma_complete( struct Scsi_Host *instance ) |
| 1190 | { |
| 1191 | SETUP_HOSTDATA(instance); |
| 1192 | int transfered; |
| 1193 | unsigned char **data; |
| 1194 | volatile int *count; |
| 1195 | |
| 1196 | if (!hostdata->connected) { |
| 1197 | printk(KERN_WARNING "scsi%d: received end of DMA interrupt with " |
| 1198 | "no connected cmd\n", HOSTNO); |
| 1199 | return; |
| 1200 | } |
| 1201 | |
| 1202 | DMA_PRINTK("scsi%d: real DMA transfer complete, basr 0x%X, sr 0x%X\n", |
| 1203 | HOSTNO, NCR5380_read(BUS_AND_STATUS_REG), |
| 1204 | NCR5380_read(STATUS_REG)); |
| 1205 | |
| 1206 | if((sun3scsi_dma_finish(rq_data_dir(hostdata->connected->request)))) { |
| 1207 | printk("scsi%d: overrun in UDC counter -- not prepared to deal with this!\n", HOSTNO); |
| 1208 | printk("please e-mail sammy@sammy.net with a description of how this\n"); |
| 1209 | printk("error was produced.\n"); |
| 1210 | BUG(); |
| 1211 | } |
| 1212 | |
| 1213 | /* make sure we're not stuck in a data phase */ |
| 1214 | if((NCR5380_read(BUS_AND_STATUS_REG) & (BASR_PHASE_MATCH | |
| 1215 | BASR_ACK)) == |
| 1216 | (BASR_PHASE_MATCH | BASR_ACK)) { |
| 1217 | printk("scsi%d: BASR %02x\n", HOSTNO, NCR5380_read(BUS_AND_STATUS_REG)); |
| 1218 | printk("scsi%d: bus stuck in data phase -- probably a single byte " |
| 1219 | "overrun!\n", HOSTNO); |
| 1220 | printk("not prepared for this error!\n"); |
| 1221 | printk("please e-mail sammy@sammy.net with a description of how this\n"); |
| 1222 | printk("error was produced.\n"); |
| 1223 | BUG(); |
| 1224 | } |
| 1225 | |
| 1226 | |
| 1227 | |
| 1228 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1229 | NCR5380_write(MODE_REG, MR_BASE); |
| 1230 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1231 | |
| 1232 | transfered = hostdata->dma_len - NCR5380_dma_residual(instance); |
| 1233 | hostdata->dma_len = 0; |
| 1234 | |
| 1235 | data = (unsigned char **) &(hostdata->connected->SCp.ptr); |
| 1236 | count = &(hostdata->connected->SCp.this_residual); |
| 1237 | *data += transfered; |
| 1238 | *count -= transfered; |
| 1239 | |
| 1240 | } |
| 1241 | #endif /* REAL_DMA */ |
| 1242 | |
| 1243 | |
| 1244 | /* |
| 1245 | * Function : void NCR5380_intr (int irq) |
| 1246 | * |
| 1247 | * Purpose : handle interrupts, reestablishing I_T_L or I_T_L_Q nexuses |
| 1248 | * from the disconnected queue, and restarting NCR5380_main() |
| 1249 | * as required. |
| 1250 | * |
| 1251 | * Inputs : int irq, irq that caused this interrupt. |
| 1252 | * |
| 1253 | */ |
| 1254 | |
| 1255 | static irqreturn_t NCR5380_intr (int irq, void *dev_id, struct pt_regs *regs) |
| 1256 | { |
| 1257 | struct Scsi_Host *instance = first_instance; |
| 1258 | int done = 1, handled = 0; |
| 1259 | unsigned char basr; |
| 1260 | |
| 1261 | INT_PRINTK("scsi%d: NCR5380 irq triggered\n", HOSTNO); |
| 1262 | |
| 1263 | /* Look for pending interrupts */ |
| 1264 | basr = NCR5380_read(BUS_AND_STATUS_REG); |
| 1265 | INT_PRINTK("scsi%d: BASR=%02x\n", HOSTNO, basr); |
| 1266 | /* dispatch to appropriate routine if found and done=0 */ |
| 1267 | if (basr & BASR_IRQ) { |
| 1268 | NCR_PRINT(NDEBUG_INTR); |
| 1269 | if ((NCR5380_read(STATUS_REG) & (SR_SEL|SR_IO)) == (SR_SEL|SR_IO)) { |
| 1270 | done = 0; |
| 1271 | ENABLE_IRQ(); |
| 1272 | INT_PRINTK("scsi%d: SEL interrupt\n", HOSTNO); |
| 1273 | NCR5380_reselect(instance); |
| 1274 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1275 | } |
| 1276 | else if (basr & BASR_PARITY_ERROR) { |
| 1277 | INT_PRINTK("scsi%d: PARITY interrupt\n", HOSTNO); |
| 1278 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1279 | } |
| 1280 | else if ((NCR5380_read(STATUS_REG) & SR_RST) == SR_RST) { |
| 1281 | INT_PRINTK("scsi%d: RESET interrupt\n", HOSTNO); |
| 1282 | (void)NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1283 | } |
| 1284 | else { |
| 1285 | /* |
| 1286 | * The rest of the interrupt conditions can occur only during a |
| 1287 | * DMA transfer |
| 1288 | */ |
| 1289 | |
| 1290 | #if defined(REAL_DMA) |
| 1291 | /* |
| 1292 | * We should only get PHASE MISMATCH and EOP interrupts if we have |
| 1293 | * DMA enabled, so do a sanity check based on the current setting |
| 1294 | * of the MODE register. |
| 1295 | */ |
| 1296 | |
| 1297 | if ((NCR5380_read(MODE_REG) & MR_DMA_MODE) && |
| 1298 | ((basr & BASR_END_DMA_TRANSFER) || |
| 1299 | !(basr & BASR_PHASE_MATCH))) { |
| 1300 | |
| 1301 | INT_PRINTK("scsi%d: PHASE MISM or EOP interrupt\n", HOSTNO); |
| 1302 | NCR5380_dma_complete( instance ); |
| 1303 | done = 0; |
| 1304 | ENABLE_IRQ(); |
| 1305 | } else |
| 1306 | #endif /* REAL_DMA */ |
| 1307 | { |
| 1308 | /* MS: Ignore unknown phase mismatch interrupts (caused by EOP interrupt) */ |
| 1309 | if (basr & BASR_PHASE_MATCH) |
| 1310 | INT_PRINTK("scsi%d: unknown interrupt, " |
| 1311 | "BASR 0x%x, MR 0x%x, SR 0x%x\n", |
| 1312 | HOSTNO, basr, NCR5380_read(MODE_REG), |
| 1313 | NCR5380_read(STATUS_REG)); |
| 1314 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1315 | #ifdef SUN3_SCSI_VME |
| 1316 | dregs->csr |= CSR_DMA_ENABLE; |
| 1317 | #endif |
| 1318 | } |
| 1319 | } /* if !(SELECTION || PARITY) */ |
| 1320 | handled = 1; |
| 1321 | } /* BASR & IRQ */ |
| 1322 | else { |
| 1323 | |
| 1324 | printk(KERN_NOTICE "scsi%d: interrupt without IRQ bit set in BASR, " |
| 1325 | "BASR 0x%X, MR 0x%X, SR 0x%x\n", HOSTNO, basr, |
| 1326 | NCR5380_read(MODE_REG), NCR5380_read(STATUS_REG)); |
| 1327 | (void) NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1328 | #ifdef SUN3_SCSI_VME |
| 1329 | dregs->csr |= CSR_DMA_ENABLE; |
| 1330 | #endif |
| 1331 | } |
| 1332 | |
| 1333 | if (!done) { |
| 1334 | INT_PRINTK("scsi%d: in int routine, calling main\n", HOSTNO); |
| 1335 | /* Put a call to NCR5380_main() on the queue... */ |
| 1336 | queue_main(); |
| 1337 | } |
| 1338 | return IRQ_RETVAL(handled); |
| 1339 | } |
| 1340 | |
| 1341 | #ifdef NCR5380_STATS |
| 1342 | static void collect_stats(struct NCR5380_hostdata* hostdata, Scsi_Cmnd* cmd) |
| 1343 | { |
| 1344 | # ifdef NCR5380_STAT_LIMIT |
| 1345 | if (cmd->request_bufflen > NCR5380_STAT_LIMIT) |
| 1346 | # endif |
| 1347 | switch (cmd->cmnd[0]) |
| 1348 | { |
| 1349 | case WRITE: |
| 1350 | case WRITE_6: |
| 1351 | case WRITE_10: |
| 1352 | hostdata->time_write[cmd->device->id] += (jiffies - hostdata->timebase); |
| 1353 | /*hostdata->bytes_write[cmd->device->id] += cmd->request_bufflen;*/ |
| 1354 | hostdata->pendingw--; |
| 1355 | break; |
| 1356 | case READ: |
| 1357 | case READ_6: |
| 1358 | case READ_10: |
| 1359 | hostdata->time_read[cmd->device->id] += (jiffies - hostdata->timebase); |
| 1360 | /*hostdata->bytes_read[cmd->device->id] += cmd->request_bufflen;*/ |
| 1361 | hostdata->pendingr--; |
| 1362 | break; |
| 1363 | } |
| 1364 | } |
| 1365 | #endif |
| 1366 | |
| 1367 | /* |
| 1368 | * Function : int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, |
| 1369 | * int tag); |
| 1370 | * |
| 1371 | * Purpose : establishes I_T_L or I_T_L_Q nexus for new or existing command, |
| 1372 | * including ARBITRATION, SELECTION, and initial message out for |
| 1373 | * IDENTIFY and queue messages. |
| 1374 | * |
| 1375 | * Inputs : instance - instantiation of the 5380 driver on which this |
| 1376 | * target lives, cmd - SCSI command to execute, tag - set to TAG_NEXT for |
| 1377 | * new tag, TAG_NONE for untagged queueing, otherwise set to the tag for |
| 1378 | * the command that is presently connected. |
| 1379 | * |
| 1380 | * Returns : -1 if selection could not execute for some reason, |
| 1381 | * 0 if selection succeeded or failed because the target |
| 1382 | * did not respond. |
| 1383 | * |
| 1384 | * Side effects : |
| 1385 | * If bus busy, arbitration failed, etc, NCR5380_select() will exit |
| 1386 | * with registers as they should have been on entry - ie |
| 1387 | * SELECT_ENABLE will be set appropriately, the NCR5380 |
| 1388 | * will cease to drive any SCSI bus signals. |
| 1389 | * |
| 1390 | * If successful : I_T_L or I_T_L_Q nexus will be established, |
| 1391 | * instance->connected will be set to cmd. |
| 1392 | * SELECT interrupt will be disabled. |
| 1393 | * |
| 1394 | * If failed (no target) : cmd->scsi_done() will be called, and the |
| 1395 | * cmd->result host byte set to DID_BAD_TARGET. |
| 1396 | */ |
| 1397 | |
| 1398 | static int NCR5380_select (struct Scsi_Host *instance, Scsi_Cmnd *cmd, int tag) |
| 1399 | { |
| 1400 | SETUP_HOSTDATA(instance); |
| 1401 | unsigned char tmp[3], phase; |
| 1402 | unsigned char *data; |
| 1403 | int len; |
| 1404 | unsigned long timeout; |
| 1405 | unsigned long flags; |
| 1406 | |
| 1407 | hostdata->restart_select = 0; |
| 1408 | NCR_PRINT(NDEBUG_ARBITRATION); |
| 1409 | ARB_PRINTK("scsi%d: starting arbitration, id = %d\n", HOSTNO, |
| 1410 | instance->this_id); |
| 1411 | |
| 1412 | /* |
| 1413 | * Set the phase bits to 0, otherwise the NCR5380 won't drive the |
| 1414 | * data bus during SELECTION. |
| 1415 | */ |
| 1416 | |
| 1417 | local_irq_save(flags); |
| 1418 | if (hostdata->connected) { |
| 1419 | local_irq_restore(flags); |
| 1420 | return -1; |
| 1421 | } |
| 1422 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 1423 | |
| 1424 | |
| 1425 | /* |
| 1426 | * Start arbitration. |
| 1427 | */ |
| 1428 | |
| 1429 | NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask); |
| 1430 | NCR5380_write(MODE_REG, MR_ARBITRATE); |
| 1431 | |
| 1432 | local_irq_restore(flags); |
| 1433 | |
| 1434 | /* Wait for arbitration logic to complete */ |
| 1435 | #if NCR_TIMEOUT |
| 1436 | { |
| 1437 | unsigned long timeout = jiffies + 2*NCR_TIMEOUT; |
| 1438 | |
| 1439 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) |
| 1440 | && time_before(jiffies, timeout) && !hostdata->connected) |
| 1441 | ; |
| 1442 | if (time_after_eq(jiffies, timeout)) |
| 1443 | { |
| 1444 | printk("scsi : arbitration timeout at %d\n", __LINE__); |
| 1445 | NCR5380_write(MODE_REG, MR_BASE); |
| 1446 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1447 | return -1; |
| 1448 | } |
| 1449 | } |
| 1450 | #else /* NCR_TIMEOUT */ |
| 1451 | while (!(NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_PROGRESS) |
| 1452 | && !hostdata->connected); |
| 1453 | #endif |
| 1454 | |
| 1455 | ARB_PRINTK("scsi%d: arbitration complete\n", HOSTNO); |
| 1456 | |
| 1457 | if (hostdata->connected) { |
| 1458 | NCR5380_write(MODE_REG, MR_BASE); |
| 1459 | return -1; |
| 1460 | } |
| 1461 | /* |
| 1462 | * The arbitration delay is 2.2us, but this is a minimum and there is |
| 1463 | * no maximum so we can safely sleep for ceil(2.2) usecs to accommodate |
| 1464 | * the integral nature of udelay(). |
| 1465 | * |
| 1466 | */ |
| 1467 | |
| 1468 | udelay(3); |
| 1469 | |
| 1470 | /* Check for lost arbitration */ |
| 1471 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
| 1472 | (NCR5380_read(CURRENT_SCSI_DATA_REG) & hostdata->id_higher_mask) || |
| 1473 | (NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
| 1474 | hostdata->connected) { |
| 1475 | NCR5380_write(MODE_REG, MR_BASE); |
| 1476 | ARB_PRINTK("scsi%d: lost arbitration, deasserting MR_ARBITRATE\n", |
| 1477 | HOSTNO); |
| 1478 | return -1; |
| 1479 | } |
| 1480 | |
| 1481 | /* after/during arbitration, BSY should be asserted. |
| 1482 | IBM DPES-31080 Version S31Q works now */ |
| 1483 | /* Tnx to Thomas_Roesch@m2.maus.de for finding this! (Roman) */ |
| 1484 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_SEL | |
| 1485 | ICR_ASSERT_BSY ) ; |
| 1486 | |
| 1487 | if ((NCR5380_read(INITIATOR_COMMAND_REG) & ICR_ARBITRATION_LOST) || |
| 1488 | hostdata->connected) { |
| 1489 | NCR5380_write(MODE_REG, MR_BASE); |
| 1490 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1491 | ARB_PRINTK("scsi%d: lost arbitration, deasserting ICR_ASSERT_SEL\n", |
| 1492 | HOSTNO); |
| 1493 | return -1; |
| 1494 | } |
| 1495 | |
| 1496 | /* |
| 1497 | * Again, bus clear + bus settle time is 1.2us, however, this is |
| 1498 | * a minimum so we'll udelay ceil(1.2) |
| 1499 | */ |
| 1500 | |
| 1501 | #ifdef CONFIG_ATARI_SCSI_TOSHIBA_DELAY |
| 1502 | /* ++roman: But some targets (see above :-) seem to need a bit more... */ |
| 1503 | udelay(15); |
| 1504 | #else |
| 1505 | udelay(2); |
| 1506 | #endif |
| 1507 | |
| 1508 | if (hostdata->connected) { |
| 1509 | NCR5380_write(MODE_REG, MR_BASE); |
| 1510 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1511 | return -1; |
| 1512 | } |
| 1513 | |
| 1514 | ARB_PRINTK("scsi%d: won arbitration\n", HOSTNO); |
| 1515 | |
| 1516 | /* |
| 1517 | * Now that we have won arbitration, start Selection process, asserting |
| 1518 | * the host and target ID's on the SCSI bus. |
| 1519 | */ |
| 1520 | |
| 1521 | NCR5380_write(OUTPUT_DATA_REG, (hostdata->id_mask | (1 << cmd->device->id))); |
| 1522 | |
| 1523 | /* |
| 1524 | * Raise ATN while SEL is true before BSY goes false from arbitration, |
| 1525 | * since this is the only way to guarantee that we'll get a MESSAGE OUT |
| 1526 | * phase immediately after selection. |
| 1527 | */ |
| 1528 | |
| 1529 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_BSY | |
| 1530 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_SEL )); |
| 1531 | NCR5380_write(MODE_REG, MR_BASE); |
| 1532 | |
| 1533 | /* |
| 1534 | * Reselect interrupts must be turned off prior to the dropping of BSY, |
| 1535 | * otherwise we will trigger an interrupt. |
| 1536 | */ |
| 1537 | |
| 1538 | if (hostdata->connected) { |
| 1539 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1540 | return -1; |
| 1541 | } |
| 1542 | |
| 1543 | NCR5380_write(SELECT_ENABLE_REG, 0); |
| 1544 | |
| 1545 | /* |
| 1546 | * The initiator shall then wait at least two deskew delays and release |
| 1547 | * the BSY signal. |
| 1548 | */ |
| 1549 | udelay(1); /* wingel -- wait two bus deskew delay >2*45ns */ |
| 1550 | |
| 1551 | /* Reset BSY */ |
| 1552 | NCR5380_write(INITIATOR_COMMAND_REG, (ICR_BASE | ICR_ASSERT_DATA | |
| 1553 | ICR_ASSERT_ATN | ICR_ASSERT_SEL)); |
| 1554 | |
| 1555 | /* |
| 1556 | * Something weird happens when we cease to drive BSY - looks |
| 1557 | * like the board/chip is letting us do another read before the |
| 1558 | * appropriate propagation delay has expired, and we're confusing |
| 1559 | * a BSY signal from ourselves as the target's response to SELECTION. |
| 1560 | * |
| 1561 | * A small delay (the 'C++' frontend breaks the pipeline with an |
| 1562 | * unnecessary jump, making it work on my 386-33/Trantor T128, the |
| 1563 | * tighter 'C' code breaks and requires this) solves the problem - |
| 1564 | * the 1 us delay is arbitrary, and only used because this delay will |
| 1565 | * be the same on other platforms and since it works here, it should |
| 1566 | * work there. |
| 1567 | * |
| 1568 | * wingel suggests that this could be due to failing to wait |
| 1569 | * one deskew delay. |
| 1570 | */ |
| 1571 | |
| 1572 | udelay(1); |
| 1573 | |
| 1574 | SEL_PRINTK("scsi%d: selecting target %d\n", HOSTNO, cmd->device->id); |
| 1575 | |
| 1576 | /* |
| 1577 | * The SCSI specification calls for a 250 ms timeout for the actual |
| 1578 | * selection. |
| 1579 | */ |
| 1580 | |
| 1581 | timeout = jiffies + 25; |
| 1582 | |
| 1583 | /* |
| 1584 | * XXX very interesting - we're seeing a bounce where the BSY we |
| 1585 | * asserted is being reflected / still asserted (propagation delay?) |
| 1586 | * and it's detecting as true. Sigh. |
| 1587 | */ |
| 1588 | |
| 1589 | #if 0 |
| 1590 | /* ++roman: If a target conformed to the SCSI standard, it wouldn't assert |
| 1591 | * IO while SEL is true. But again, there are some disks out the in the |
| 1592 | * world that do that nevertheless. (Somebody claimed that this announces |
| 1593 | * reselection capability of the target.) So we better skip that test and |
| 1594 | * only wait for BSY... (Famous german words: Der Klügere gibt nach :-) |
| 1595 | */ |
| 1596 | |
| 1597 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & |
| 1598 | (SR_BSY | SR_IO))); |
| 1599 | |
| 1600 | if ((NCR5380_read(STATUS_REG) & (SR_SEL | SR_IO)) == |
| 1601 | (SR_SEL | SR_IO)) { |
| 1602 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1603 | NCR5380_reselect(instance); |
| 1604 | printk (KERN_ERR "scsi%d: reselection after won arbitration?\n", |
| 1605 | HOSTNO); |
| 1606 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1607 | return -1; |
| 1608 | } |
| 1609 | #else |
| 1610 | while (time_before(jiffies, timeout) && !(NCR5380_read(STATUS_REG) & SR_BSY)); |
| 1611 | #endif |
| 1612 | |
| 1613 | /* |
| 1614 | * No less than two deskew delays after the initiator detects the |
| 1615 | * BSY signal is true, it shall release the SEL signal and may |
| 1616 | * change the DATA BUS. -wingel |
| 1617 | */ |
| 1618 | |
| 1619 | udelay(1); |
| 1620 | |
| 1621 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1622 | |
| 1623 | if (!(NCR5380_read(STATUS_REG) & SR_BSY)) { |
| 1624 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1625 | if (hostdata->targets_present & (1 << cmd->device->id)) { |
| 1626 | printk(KERN_ERR "scsi%d: weirdness\n", HOSTNO); |
| 1627 | if (hostdata->restart_select) |
| 1628 | printk(KERN_NOTICE "\trestart select\n"); |
| 1629 | NCR_PRINT(NDEBUG_ANY); |
| 1630 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1631 | return -1; |
| 1632 | } |
| 1633 | cmd->result = DID_BAD_TARGET << 16; |
| 1634 | #ifdef NCR5380_STATS |
| 1635 | collect_stats(hostdata, cmd); |
| 1636 | #endif |
| 1637 | #ifdef SUPPORT_TAGS |
| 1638 | cmd_free_tag( cmd ); |
| 1639 | #endif |
| 1640 | cmd->scsi_done(cmd); |
| 1641 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1642 | SEL_PRINTK("scsi%d: target did not respond within 250ms\n", HOSTNO); |
| 1643 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 1644 | return 0; |
| 1645 | } |
| 1646 | |
| 1647 | hostdata->targets_present |= (1 << cmd->device->id); |
| 1648 | |
| 1649 | /* |
| 1650 | * Since we followed the SCSI spec, and raised ATN while SEL |
| 1651 | * was true but before BSY was false during selection, the information |
| 1652 | * transfer phase should be a MESSAGE OUT phase so that we can send the |
| 1653 | * IDENTIFY message. |
| 1654 | * |
| 1655 | * If SCSI-II tagged queuing is enabled, we also send a SIMPLE_QUEUE_TAG |
| 1656 | * message (2 bytes) with a tag ID that we increment with every command |
| 1657 | * until it wraps back to 0. |
| 1658 | * |
| 1659 | * XXX - it turns out that there are some broken SCSI-II devices, |
| 1660 | * which claim to support tagged queuing but fail when more than |
| 1661 | * some number of commands are issued at once. |
| 1662 | */ |
| 1663 | |
| 1664 | /* Wait for start of REQ/ACK handshake */ |
| 1665 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); |
| 1666 | |
| 1667 | SEL_PRINTK("scsi%d: target %d selected, going into MESSAGE OUT phase.\n", |
| 1668 | HOSTNO, cmd->device->id); |
| 1669 | tmp[0] = IDENTIFY(1, cmd->device->lun); |
| 1670 | |
| 1671 | #ifdef SUPPORT_TAGS |
| 1672 | if (cmd->tag != TAG_NONE) { |
| 1673 | tmp[1] = hostdata->last_message = SIMPLE_QUEUE_TAG; |
| 1674 | tmp[2] = cmd->tag; |
| 1675 | len = 3; |
| 1676 | } else |
| 1677 | len = 1; |
| 1678 | #else |
| 1679 | len = 1; |
| 1680 | cmd->tag=0; |
| 1681 | #endif /* SUPPORT_TAGS */ |
| 1682 | |
| 1683 | /* Send message(s) */ |
| 1684 | data = tmp; |
| 1685 | phase = PHASE_MSGOUT; |
| 1686 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 1687 | SEL_PRINTK("scsi%d: nexus established.\n", HOSTNO); |
| 1688 | /* XXX need to handle errors here */ |
| 1689 | hostdata->connected = cmd; |
| 1690 | #ifndef SUPPORT_TAGS |
| 1691 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| 1692 | #endif |
| 1693 | #ifdef SUN3_SCSI_VME |
| 1694 | dregs->csr |= CSR_INTR; |
| 1695 | #endif |
| 1696 | initialize_SCp(cmd); |
| 1697 | |
| 1698 | |
| 1699 | return 0; |
| 1700 | } |
| 1701 | |
| 1702 | /* |
| 1703 | * Function : int NCR5380_transfer_pio (struct Scsi_Host *instance, |
| 1704 | * unsigned char *phase, int *count, unsigned char **data) |
| 1705 | * |
| 1706 | * Purpose : transfers data in given phase using polled I/O |
| 1707 | * |
| 1708 | * Inputs : instance - instance of driver, *phase - pointer to |
| 1709 | * what phase is expected, *count - pointer to number of |
| 1710 | * bytes to transfer, **data - pointer to data pointer. |
| 1711 | * |
| 1712 | * Returns : -1 when different phase is entered without transferring |
| 1713 | * maximum number of bytes, 0 if all bytes are transfered or exit |
| 1714 | * is in same phase. |
| 1715 | * |
| 1716 | * Also, *phase, *count, *data are modified in place. |
| 1717 | * |
| 1718 | * XXX Note : handling for bus free may be useful. |
| 1719 | */ |
| 1720 | |
| 1721 | /* |
| 1722 | * Note : this code is not as quick as it could be, however it |
| 1723 | * IS 100% reliable, and for the actual data transfer where speed |
| 1724 | * counts, we will always do a pseudo DMA or DMA transfer. |
| 1725 | */ |
| 1726 | |
| 1727 | static int NCR5380_transfer_pio( struct Scsi_Host *instance, |
| 1728 | unsigned char *phase, int *count, |
| 1729 | unsigned char **data) |
| 1730 | { |
| 1731 | register unsigned char p = *phase, tmp; |
| 1732 | register int c = *count; |
| 1733 | register unsigned char *d = *data; |
| 1734 | |
| 1735 | /* |
| 1736 | * The NCR5380 chip will only drive the SCSI bus when the |
| 1737 | * phase specified in the appropriate bits of the TARGET COMMAND |
| 1738 | * REGISTER match the STATUS REGISTER |
| 1739 | */ |
| 1740 | |
| 1741 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(p)); |
| 1742 | |
| 1743 | do { |
| 1744 | /* |
| 1745 | * Wait for assertion of REQ, after which the phase bits will be |
| 1746 | * valid |
| 1747 | */ |
| 1748 | while (!((tmp = NCR5380_read(STATUS_REG)) & SR_REQ)); |
| 1749 | |
| 1750 | HSH_PRINTK("scsi%d: REQ detected\n", HOSTNO); |
| 1751 | |
| 1752 | /* Check for phase mismatch */ |
| 1753 | if ((tmp & PHASE_MASK) != p) { |
| 1754 | PIO_PRINTK("scsi%d: phase mismatch\n", HOSTNO); |
| 1755 | NCR_PRINT_PHASE(NDEBUG_PIO); |
| 1756 | break; |
| 1757 | } |
| 1758 | |
| 1759 | /* Do actual transfer from SCSI bus to / from memory */ |
| 1760 | if (!(p & SR_IO)) |
| 1761 | NCR5380_write(OUTPUT_DATA_REG, *d); |
| 1762 | else |
| 1763 | *d = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| 1764 | |
| 1765 | ++d; |
| 1766 | |
| 1767 | /* |
| 1768 | * The SCSI standard suggests that in MSGOUT phase, the initiator |
| 1769 | * should drop ATN on the last byte of the message phase |
| 1770 | * after REQ has been asserted for the handshake but before |
| 1771 | * the initiator raises ACK. |
| 1772 | */ |
| 1773 | |
| 1774 | if (!(p & SR_IO)) { |
| 1775 | if (!((p & SR_MSG) && c > 1)) { |
| 1776 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 1777 | ICR_ASSERT_DATA); |
| 1778 | NCR_PRINT(NDEBUG_PIO); |
| 1779 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 1780 | ICR_ASSERT_DATA | ICR_ASSERT_ACK); |
| 1781 | } else { |
| 1782 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 1783 | ICR_ASSERT_DATA | ICR_ASSERT_ATN); |
| 1784 | NCR_PRINT(NDEBUG_PIO); |
| 1785 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 1786 | ICR_ASSERT_DATA | ICR_ASSERT_ATN | ICR_ASSERT_ACK); |
| 1787 | } |
| 1788 | } else { |
| 1789 | NCR_PRINT(NDEBUG_PIO); |
| 1790 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
| 1791 | } |
| 1792 | |
| 1793 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
| 1794 | |
| 1795 | HSH_PRINTK("scsi%d: req false, handshake complete\n", HOSTNO); |
| 1796 | |
| 1797 | /* |
| 1798 | * We have several special cases to consider during REQ/ACK handshaking : |
| 1799 | * 1. We were in MSGOUT phase, and we are on the last byte of the |
| 1800 | * message. ATN must be dropped as ACK is dropped. |
| 1801 | * |
| 1802 | * 2. We are in a MSGIN phase, and we are on the last byte of the |
| 1803 | * message. We must exit with ACK asserted, so that the calling |
| 1804 | * code may raise ATN before dropping ACK to reject the message. |
| 1805 | * |
| 1806 | * 3. ACK and ATN are clear and the target may proceed as normal. |
| 1807 | */ |
| 1808 | if (!(p == PHASE_MSGIN && c == 1)) { |
| 1809 | if (p == PHASE_MSGOUT && c > 1) |
| 1810 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1811 | else |
| 1812 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 1813 | } |
| 1814 | } while (--c); |
| 1815 | |
| 1816 | PIO_PRINTK("scsi%d: residual %d\n", HOSTNO, c); |
| 1817 | |
| 1818 | *count = c; |
| 1819 | *data = d; |
| 1820 | tmp = NCR5380_read(STATUS_REG); |
| 1821 | /* The phase read from the bus is valid if either REQ is (already) |
| 1822 | * asserted or if ACK hasn't been released yet. The latter is the case if |
| 1823 | * we're in MSGIN and all wanted bytes have been received. */ |
| 1824 | if ((tmp & SR_REQ) || (p == PHASE_MSGIN && c == 0)) |
| 1825 | *phase = tmp & PHASE_MASK; |
| 1826 | else |
| 1827 | *phase = PHASE_UNKNOWN; |
| 1828 | |
| 1829 | if (!c || (*phase == p)) |
| 1830 | return 0; |
| 1831 | else |
| 1832 | return -1; |
| 1833 | } |
| 1834 | |
| 1835 | /* |
| 1836 | * Function : do_abort (Scsi_Host *host) |
| 1837 | * |
| 1838 | * Purpose : abort the currently established nexus. Should only be |
| 1839 | * called from a routine which can drop into a |
| 1840 | * |
| 1841 | * Returns : 0 on success, -1 on failure. |
| 1842 | */ |
| 1843 | |
| 1844 | static int do_abort (struct Scsi_Host *host) |
| 1845 | { |
| 1846 | unsigned char tmp, *msgptr, phase; |
| 1847 | int len; |
| 1848 | |
| 1849 | /* Request message out phase */ |
| 1850 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1851 | |
| 1852 | /* |
| 1853 | * Wait for the target to indicate a valid phase by asserting |
| 1854 | * REQ. Once this happens, we'll have either a MSGOUT phase |
| 1855 | * and can immediately send the ABORT message, or we'll have some |
| 1856 | * other phase and will have to source/sink data. |
| 1857 | * |
| 1858 | * We really don't care what value was on the bus or what value |
| 1859 | * the target sees, so we just handshake. |
| 1860 | */ |
| 1861 | |
| 1862 | while (!(tmp = NCR5380_read(STATUS_REG)) & SR_REQ); |
| 1863 | |
| 1864 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| 1865 | |
| 1866 | if ((tmp & PHASE_MASK) != PHASE_MSGOUT) { |
| 1867 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | |
| 1868 | ICR_ASSERT_ACK); |
| 1869 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
| 1870 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN); |
| 1871 | } |
| 1872 | |
| 1873 | tmp = ABORT; |
| 1874 | msgptr = &tmp; |
| 1875 | len = 1; |
| 1876 | phase = PHASE_MSGOUT; |
| 1877 | NCR5380_transfer_pio (host, &phase, &len, &msgptr); |
| 1878 | |
| 1879 | /* |
| 1880 | * If we got here, and the command completed successfully, |
| 1881 | * we're about to go into bus free state. |
| 1882 | */ |
| 1883 | |
| 1884 | return len ? -1 : 0; |
| 1885 | } |
| 1886 | |
| 1887 | #if defined(REAL_DMA) |
| 1888 | /* |
| 1889 | * Function : int NCR5380_transfer_dma (struct Scsi_Host *instance, |
| 1890 | * unsigned char *phase, int *count, unsigned char **data) |
| 1891 | * |
| 1892 | * Purpose : transfers data in given phase using either real |
| 1893 | * or pseudo DMA. |
| 1894 | * |
| 1895 | * Inputs : instance - instance of driver, *phase - pointer to |
| 1896 | * what phase is expected, *count - pointer to number of |
| 1897 | * bytes to transfer, **data - pointer to data pointer. |
| 1898 | * |
| 1899 | * Returns : -1 when different phase is entered without transferring |
| 1900 | * maximum number of bytes, 0 if all bytes or transfered or exit |
| 1901 | * is in same phase. |
| 1902 | * |
| 1903 | * Also, *phase, *count, *data are modified in place. |
| 1904 | * |
| 1905 | */ |
| 1906 | |
| 1907 | |
| 1908 | static int NCR5380_transfer_dma( struct Scsi_Host *instance, |
| 1909 | unsigned char *phase, int *count, |
| 1910 | unsigned char **data) |
| 1911 | { |
| 1912 | SETUP_HOSTDATA(instance); |
| 1913 | register int c = *count; |
| 1914 | register unsigned char p = *phase; |
| 1915 | unsigned long flags; |
| 1916 | |
| 1917 | /* sanity check */ |
| 1918 | if(!sun3_dma_setup_done) { |
| 1919 | printk("scsi%d: transfer_dma without setup!\n", HOSTNO); |
| 1920 | BUG(); |
| 1921 | } |
| 1922 | hostdata->dma_len = c; |
| 1923 | |
| 1924 | DMA_PRINTK("scsi%d: initializing DMA for %s, %d bytes %s %p\n", |
| 1925 | HOSTNO, (p & SR_IO) ? "reading" : "writing", |
| 1926 | c, (p & SR_IO) ? "to" : "from", *data); |
| 1927 | |
| 1928 | /* netbsd turns off ints here, why not be safe and do it too */ |
| 1929 | local_irq_save(flags); |
| 1930 | |
| 1931 | /* send start chain */ |
| 1932 | sun3scsi_dma_start(c, *data); |
| 1933 | |
| 1934 | if (p & SR_IO) { |
| 1935 | NCR5380_write(TARGET_COMMAND_REG, 1); |
| 1936 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1937 | NCR5380_write(INITIATOR_COMMAND_REG, 0); |
| 1938 | NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); |
| 1939 | NCR5380_write(START_DMA_INITIATOR_RECEIVE_REG, 0); |
| 1940 | } else { |
| 1941 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 1942 | NCR5380_read(RESET_PARITY_INTERRUPT_REG); |
| 1943 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_DATA); |
| 1944 | NCR5380_write(MODE_REG, (NCR5380_read(MODE_REG) | MR_DMA_MODE | MR_ENABLE_EOP_INTR)); |
| 1945 | NCR5380_write(START_DMA_SEND_REG, 0); |
| 1946 | } |
| 1947 | |
| 1948 | #ifdef SUN3_SCSI_VME |
| 1949 | dregs->csr |= CSR_DMA_ENABLE; |
| 1950 | #endif |
| 1951 | |
| 1952 | local_irq_restore(flags); |
| 1953 | |
| 1954 | sun3_dma_active = 1; |
| 1955 | return 0; |
| 1956 | } |
| 1957 | #endif /* defined(REAL_DMA) */ |
| 1958 | |
| 1959 | /* |
| 1960 | * Function : NCR5380_information_transfer (struct Scsi_Host *instance) |
| 1961 | * |
| 1962 | * Purpose : run through the various SCSI phases and do as the target |
| 1963 | * directs us to. Operates on the currently connected command, |
| 1964 | * instance->connected. |
| 1965 | * |
| 1966 | * Inputs : instance, instance for which we are doing commands |
| 1967 | * |
| 1968 | * Side effects : SCSI things happen, the disconnected queue will be |
| 1969 | * modified if a command disconnects, *instance->connected will |
| 1970 | * change. |
| 1971 | * |
| 1972 | * XXX Note : we need to watch for bus free or a reset condition here |
| 1973 | * to recover from an unexpected bus free condition. |
| 1974 | */ |
| 1975 | |
| 1976 | static void NCR5380_information_transfer (struct Scsi_Host *instance) |
| 1977 | { |
| 1978 | SETUP_HOSTDATA(instance); |
| 1979 | unsigned long flags; |
| 1980 | unsigned char msgout = NOP; |
| 1981 | int sink = 0; |
| 1982 | int len; |
| 1983 | #if defined(REAL_DMA) |
| 1984 | int transfersize; |
| 1985 | #endif |
| 1986 | unsigned char *data; |
| 1987 | unsigned char phase, tmp, extended_msg[10], old_phase=0xff; |
| 1988 | Scsi_Cmnd *cmd = (Scsi_Cmnd *) hostdata->connected; |
| 1989 | |
| 1990 | #ifdef SUN3_SCSI_VME |
| 1991 | dregs->csr |= CSR_INTR; |
| 1992 | #endif |
| 1993 | |
| 1994 | while (1) { |
| 1995 | tmp = NCR5380_read(STATUS_REG); |
| 1996 | /* We only have a valid SCSI phase when REQ is asserted */ |
| 1997 | if (tmp & SR_REQ) { |
| 1998 | phase = (tmp & PHASE_MASK); |
| 1999 | if (phase != old_phase) { |
| 2000 | old_phase = phase; |
| 2001 | NCR_PRINT_PHASE(NDEBUG_INFORMATION); |
| 2002 | } |
| 2003 | |
| 2004 | if(phase == PHASE_CMDOUT) { |
| 2005 | void *d; |
| 2006 | unsigned long count; |
| 2007 | |
| 2008 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
| 2009 | count = cmd->SCp.buffer->length; |
| 2010 | d = SGADDR(cmd->SCp.buffer); |
| 2011 | } else { |
| 2012 | count = cmd->SCp.this_residual; |
| 2013 | d = cmd->SCp.ptr; |
| 2014 | } |
| 2015 | #ifdef REAL_DMA |
| 2016 | /* this command setup for dma yet? */ |
| 2017 | if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done |
| 2018 | != cmd)) |
| 2019 | { |
| 2020 | if(cmd->request->flags & REQ_CMD) { |
| 2021 | sun3scsi_dma_setup(d, count, |
| 2022 | rq_data_dir(cmd->request)); |
| 2023 | sun3_dma_setup_done = cmd; |
| 2024 | } |
| 2025 | } |
| 2026 | #endif |
| 2027 | #ifdef SUN3_SCSI_VME |
| 2028 | dregs->csr |= CSR_INTR; |
| 2029 | #endif |
| 2030 | } |
| 2031 | |
| 2032 | |
| 2033 | if (sink && (phase != PHASE_MSGOUT)) { |
| 2034 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(tmp)); |
| 2035 | |
| 2036 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ATN | |
| 2037 | ICR_ASSERT_ACK); |
| 2038 | while (NCR5380_read(STATUS_REG) & SR_REQ); |
| 2039 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 2040 | ICR_ASSERT_ATN); |
| 2041 | sink = 0; |
| 2042 | continue; |
| 2043 | } |
| 2044 | |
| 2045 | switch (phase) { |
| 2046 | case PHASE_DATAOUT: |
| 2047 | #if (NDEBUG & NDEBUG_NO_DATAOUT) |
| 2048 | printk("scsi%d: NDEBUG_NO_DATAOUT set, attempted DATAOUT " |
| 2049 | "aborted\n", HOSTNO); |
| 2050 | sink = 1; |
| 2051 | do_abort(instance); |
| 2052 | cmd->result = DID_ERROR << 16; |
| 2053 | cmd->done(cmd); |
| 2054 | return; |
| 2055 | #endif |
| 2056 | case PHASE_DATAIN: |
| 2057 | /* |
| 2058 | * If there is no room left in the current buffer in the |
| 2059 | * scatter-gather list, move onto the next one. |
| 2060 | */ |
| 2061 | if (!cmd->SCp.this_residual && cmd->SCp.buffers_residual) { |
| 2062 | ++cmd->SCp.buffer; |
| 2063 | --cmd->SCp.buffers_residual; |
| 2064 | cmd->SCp.this_residual = cmd->SCp.buffer->length; |
| 2065 | cmd->SCp.ptr = SGADDR(cmd->SCp.buffer); |
| 2066 | |
| 2067 | /* ++roman: Try to merge some scatter-buffers if |
| 2068 | * they are at contiguous physical addresses. |
| 2069 | */ |
| 2070 | // merge_contiguous_buffers( cmd ); |
| 2071 | INF_PRINTK("scsi%d: %d bytes and %d buffers left\n", |
| 2072 | HOSTNO, cmd->SCp.this_residual, |
| 2073 | cmd->SCp.buffers_residual); |
| 2074 | } |
| 2075 | |
| 2076 | /* |
| 2077 | * The preferred transfer method is going to be |
| 2078 | * PSEUDO-DMA for systems that are strictly PIO, |
| 2079 | * since we can let the hardware do the handshaking. |
| 2080 | * |
| 2081 | * For this to work, we need to know the transfersize |
| 2082 | * ahead of time, since the pseudo-DMA code will sit |
| 2083 | * in an unconditional loop. |
| 2084 | */ |
| 2085 | |
| 2086 | /* ++roman: I suggest, this should be |
| 2087 | * #if def(REAL_DMA) |
| 2088 | * instead of leaving REAL_DMA out. |
| 2089 | */ |
| 2090 | |
| 2091 | #if defined(REAL_DMA) |
| 2092 | // if (!cmd->device->borken && |
| 2093 | if((transfersize = |
| 2094 | NCR5380_dma_xfer_len(instance,cmd,phase)) > SUN3_DMA_MINSIZE) { |
| 2095 | len = transfersize; |
| 2096 | cmd->SCp.phase = phase; |
| 2097 | |
| 2098 | if (NCR5380_transfer_dma(instance, &phase, |
| 2099 | &len, (unsigned char **) &cmd->SCp.ptr)) { |
| 2100 | /* |
| 2101 | * If the watchdog timer fires, all future |
| 2102 | * accesses to this device will use the |
| 2103 | * polled-IO. */ |
| 2104 | printk(KERN_NOTICE "scsi%d: switching target %d " |
| 2105 | "lun %d to slow handshake\n", HOSTNO, |
| 2106 | cmd->device->id, cmd->device->lun); |
| 2107 | cmd->device->borken = 1; |
| 2108 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 2109 | ICR_ASSERT_ATN); |
| 2110 | sink = 1; |
| 2111 | do_abort(instance); |
| 2112 | cmd->result = DID_ERROR << 16; |
| 2113 | cmd->done(cmd); |
| 2114 | /* XXX - need to source or sink data here, as appropriate */ |
| 2115 | } else { |
| 2116 | #ifdef REAL_DMA |
| 2117 | /* ++roman: When using real DMA, |
| 2118 | * information_transfer() should return after |
| 2119 | * starting DMA since it has nothing more to |
| 2120 | * do. |
| 2121 | */ |
| 2122 | return; |
| 2123 | #else |
| 2124 | cmd->SCp.this_residual -= transfersize - len; |
| 2125 | #endif |
| 2126 | } |
| 2127 | } else |
| 2128 | #endif /* defined(REAL_DMA) */ |
| 2129 | NCR5380_transfer_pio(instance, &phase, |
| 2130 | (int *) &cmd->SCp.this_residual, (unsigned char **) |
| 2131 | &cmd->SCp.ptr); |
| 2132 | #ifdef REAL_DMA |
| 2133 | /* if we had intended to dma that command clear it */ |
| 2134 | if(sun3_dma_setup_done == cmd) |
| 2135 | sun3_dma_setup_done = NULL; |
| 2136 | #endif |
| 2137 | |
| 2138 | break; |
| 2139 | case PHASE_MSGIN: |
| 2140 | len = 1; |
| 2141 | data = &tmp; |
| 2142 | NCR5380_write(SELECT_ENABLE_REG, 0); /* disable reselects */ |
| 2143 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2144 | cmd->SCp.Message = tmp; |
| 2145 | |
| 2146 | switch (tmp) { |
| 2147 | /* |
| 2148 | * Linking lets us reduce the time required to get the |
| 2149 | * next command out to the device, hopefully this will |
| 2150 | * mean we don't waste another revolution due to the delays |
| 2151 | * required by ARBITRATION and another SELECTION. |
| 2152 | * |
| 2153 | * In the current implementation proposal, low level drivers |
| 2154 | * merely have to start the next command, pointed to by |
| 2155 | * next_link, done() is called as with unlinked commands. |
| 2156 | */ |
| 2157 | #ifdef LINKED |
| 2158 | case LINKED_CMD_COMPLETE: |
| 2159 | case LINKED_FLG_CMD_COMPLETE: |
| 2160 | /* Accept message by clearing ACK */ |
| 2161 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2162 | |
| 2163 | LNK_PRINTK("scsi%d: target %d lun %d linked command " |
| 2164 | "complete.\n", HOSTNO, cmd->device->id, cmd->device->lun); |
| 2165 | |
| 2166 | /* Enable reselect interrupts */ |
| 2167 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2168 | /* |
| 2169 | * Sanity check : A linked command should only terminate |
| 2170 | * with one of these messages if there are more linked |
| 2171 | * commands available. |
| 2172 | */ |
| 2173 | |
| 2174 | if (!cmd->next_link) { |
| 2175 | printk(KERN_NOTICE "scsi%d: target %d lun %d " |
| 2176 | "linked command complete, no next_link\n", |
| 2177 | HOSTNO, cmd->device->id, cmd->device->lun); |
| 2178 | sink = 1; |
| 2179 | do_abort (instance); |
| 2180 | return; |
| 2181 | } |
| 2182 | |
| 2183 | initialize_SCp(cmd->next_link); |
| 2184 | /* The next command is still part of this process; copy it |
| 2185 | * and don't free it! */ |
| 2186 | cmd->next_link->tag = cmd->tag; |
| 2187 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| 2188 | LNK_PRINTK("scsi%d: target %d lun %d linked request " |
| 2189 | "done, calling scsi_done().\n", |
| 2190 | HOSTNO, cmd->device->id, cmd->device->lun); |
| 2191 | #ifdef NCR5380_STATS |
| 2192 | collect_stats(hostdata, cmd); |
| 2193 | #endif |
| 2194 | cmd->scsi_done(cmd); |
| 2195 | cmd = hostdata->connected; |
| 2196 | break; |
| 2197 | #endif /* def LINKED */ |
| 2198 | case ABORT: |
| 2199 | case COMMAND_COMPLETE: |
| 2200 | /* Accept message by clearing ACK */ |
| 2201 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2202 | hostdata->connected = NULL; |
| 2203 | QU_PRINTK("scsi%d: command for target %d, lun %d " |
| 2204 | "completed\n", HOSTNO, cmd->device->id, cmd->device->lun); |
| 2205 | #ifdef SUPPORT_TAGS |
| 2206 | cmd_free_tag( cmd ); |
| 2207 | if (status_byte(cmd->SCp.Status) == QUEUE_FULL) { |
| 2208 | /* Turn a QUEUE FULL status into BUSY, I think the |
| 2209 | * mid level cannot handle QUEUE FULL :-( (The |
| 2210 | * command is retried after BUSY). Also update our |
| 2211 | * queue size to the number of currently issued |
| 2212 | * commands now. |
| 2213 | */ |
| 2214 | /* ++Andreas: the mid level code knows about |
| 2215 | QUEUE_FULL now. */ |
| 2216 | TAG_ALLOC *ta = &TagAlloc[cmd->device->id][cmd->device->lun]; |
| 2217 | TAG_PRINTK("scsi%d: target %d lun %d returned " |
| 2218 | "QUEUE_FULL after %d commands\n", |
| 2219 | HOSTNO, cmd->device->id, cmd->device->lun, |
| 2220 | ta->nr_allocated); |
| 2221 | if (ta->queue_size > ta->nr_allocated) |
| 2222 | ta->nr_allocated = ta->queue_size; |
| 2223 | } |
| 2224 | #else |
| 2225 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2226 | #endif |
| 2227 | /* Enable reselect interrupts */ |
| 2228 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2229 | |
| 2230 | /* |
| 2231 | * I'm not sure what the correct thing to do here is : |
| 2232 | * |
| 2233 | * If the command that just executed is NOT a request |
| 2234 | * sense, the obvious thing to do is to set the result |
| 2235 | * code to the values of the stored parameters. |
| 2236 | * |
| 2237 | * If it was a REQUEST SENSE command, we need some way to |
| 2238 | * differentiate between the failure code of the original |
| 2239 | * and the failure code of the REQUEST sense - the obvious |
| 2240 | * case is success, where we fall through and leave the |
| 2241 | * result code unchanged. |
| 2242 | * |
| 2243 | * The non-obvious place is where the REQUEST SENSE failed |
| 2244 | */ |
| 2245 | |
| 2246 | if (cmd->cmnd[0] != REQUEST_SENSE) |
| 2247 | cmd->result = cmd->SCp.Status | (cmd->SCp.Message << 8); |
| 2248 | else if (status_byte(cmd->SCp.Status) != GOOD) |
| 2249 | cmd->result = (cmd->result & 0x00ffff) | (DID_ERROR << 16); |
| 2250 | |
| 2251 | #ifdef AUTOSENSE |
| 2252 | if ((cmd->cmnd[0] != REQUEST_SENSE) && |
| 2253 | (status_byte(cmd->SCp.Status) == CHECK_CONDITION)) { |
| 2254 | ASEN_PRINTK("scsi%d: performing request sense\n", |
| 2255 | HOSTNO); |
| 2256 | cmd->cmnd[0] = REQUEST_SENSE; |
| 2257 | cmd->cmnd[1] &= 0xe0; |
| 2258 | cmd->cmnd[2] = 0; |
| 2259 | cmd->cmnd[3] = 0; |
| 2260 | cmd->cmnd[4] = sizeof(cmd->sense_buffer); |
| 2261 | cmd->cmnd[5] = 0; |
| 2262 | cmd->cmd_len = COMMAND_SIZE(cmd->cmnd[0]); |
| 2263 | |
| 2264 | cmd->use_sg = 0; |
| 2265 | /* this is initialized from initialize_SCp |
| 2266 | cmd->SCp.buffer = NULL; |
| 2267 | cmd->SCp.buffers_residual = 0; |
| 2268 | */ |
| 2269 | cmd->request_buffer = (char *) cmd->sense_buffer; |
| 2270 | cmd->request_bufflen = sizeof(cmd->sense_buffer); |
| 2271 | |
| 2272 | local_irq_save(flags); |
| 2273 | LIST(cmd,hostdata->issue_queue); |
| 2274 | NEXT(cmd) = hostdata->issue_queue; |
| 2275 | hostdata->issue_queue = (Scsi_Cmnd *) cmd; |
| 2276 | local_irq_restore(flags); |
| 2277 | QU_PRINTK("scsi%d: REQUEST SENSE added to head of " |
| 2278 | "issue queue\n", H_NO(cmd)); |
| 2279 | } else |
| 2280 | #endif /* def AUTOSENSE */ |
| 2281 | { |
| 2282 | #ifdef NCR5380_STATS |
| 2283 | collect_stats(hostdata, cmd); |
| 2284 | #endif |
| 2285 | cmd->scsi_done(cmd); |
| 2286 | } |
| 2287 | |
| 2288 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2289 | /* |
| 2290 | * Restore phase bits to 0 so an interrupted selection, |
| 2291 | * arbitration can resume. |
| 2292 | */ |
| 2293 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 2294 | |
| 2295 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| 2296 | barrier(); |
| 2297 | |
| 2298 | return; |
| 2299 | case MESSAGE_REJECT: |
| 2300 | /* Accept message by clearing ACK */ |
| 2301 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2302 | /* Enable reselect interrupts */ |
| 2303 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2304 | switch (hostdata->last_message) { |
| 2305 | case HEAD_OF_QUEUE_TAG: |
| 2306 | case ORDERED_QUEUE_TAG: |
| 2307 | case SIMPLE_QUEUE_TAG: |
| 2308 | /* The target obviously doesn't support tagged |
| 2309 | * queuing, even though it announced this ability in |
| 2310 | * its INQUIRY data ?!? (maybe only this LUN?) Ok, |
| 2311 | * clear 'tagged_supported' and lock the LUN, since |
| 2312 | * the command is treated as untagged further on. |
| 2313 | */ |
| 2314 | cmd->device->tagged_supported = 0; |
| 2315 | hostdata->busy[cmd->device->id] |= (1 << cmd->device->lun); |
| 2316 | cmd->tag = TAG_NONE; |
| 2317 | TAG_PRINTK("scsi%d: target %d lun %d rejected " |
| 2318 | "QUEUE_TAG message; tagged queuing " |
| 2319 | "disabled\n", |
| 2320 | HOSTNO, cmd->device->id, cmd->device->lun); |
| 2321 | break; |
| 2322 | } |
| 2323 | break; |
| 2324 | case DISCONNECT: |
| 2325 | /* Accept message by clearing ACK */ |
| 2326 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2327 | local_irq_save(flags); |
| 2328 | cmd->device->disconnect = 1; |
| 2329 | LIST(cmd,hostdata->disconnected_queue); |
| 2330 | NEXT(cmd) = hostdata->disconnected_queue; |
| 2331 | hostdata->connected = NULL; |
| 2332 | hostdata->disconnected_queue = cmd; |
| 2333 | local_irq_restore(flags); |
| 2334 | QU_PRINTK("scsi%d: command for target %d lun %d was " |
| 2335 | "moved from connected to the " |
| 2336 | "disconnected_queue\n", HOSTNO, |
| 2337 | cmd->device->id, cmd->device->lun); |
| 2338 | /* |
| 2339 | * Restore phase bits to 0 so an interrupted selection, |
| 2340 | * arbitration can resume. |
| 2341 | */ |
| 2342 | NCR5380_write(TARGET_COMMAND_REG, 0); |
| 2343 | |
| 2344 | /* Enable reselect interrupts */ |
| 2345 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2346 | /* Wait for bus free to avoid nasty timeouts */ |
| 2347 | while ((NCR5380_read(STATUS_REG) & SR_BSY) && !hostdata->connected) |
| 2348 | barrier(); |
| 2349 | #ifdef SUN3_SCSI_VME |
| 2350 | dregs->csr |= CSR_DMA_ENABLE; |
| 2351 | #endif |
| 2352 | return; |
| 2353 | /* |
| 2354 | * The SCSI data pointer is *IMPLICITLY* saved on a disconnect |
| 2355 | * operation, in violation of the SCSI spec so we can safely |
| 2356 | * ignore SAVE/RESTORE pointers calls. |
| 2357 | * |
| 2358 | * Unfortunately, some disks violate the SCSI spec and |
| 2359 | * don't issue the required SAVE_POINTERS message before |
| 2360 | * disconnecting, and we have to break spec to remain |
| 2361 | * compatible. |
| 2362 | */ |
| 2363 | case SAVE_POINTERS: |
| 2364 | case RESTORE_POINTERS: |
| 2365 | /* Accept message by clearing ACK */ |
| 2366 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2367 | /* Enable reselect interrupts */ |
| 2368 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 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 | |
| 2387 | EXT_PRINTK("scsi%d: receiving extended message\n", HOSTNO); |
| 2388 | |
| 2389 | len = 2; |
| 2390 | data = extended_msg + 1; |
| 2391 | phase = PHASE_MSGIN; |
| 2392 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2393 | EXT_PRINTK("scsi%d: length=%d, code=0x%02x\n", HOSTNO, |
| 2394 | (int)extended_msg[1], (int)extended_msg[2]); |
| 2395 | |
| 2396 | if (!len && extended_msg[1] <= |
| 2397 | (sizeof (extended_msg) - 1)) { |
| 2398 | /* Accept third byte by clearing ACK */ |
| 2399 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2400 | len = extended_msg[1] - 1; |
| 2401 | data = extended_msg + 3; |
| 2402 | phase = PHASE_MSGIN; |
| 2403 | |
| 2404 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2405 | EXT_PRINTK("scsi%d: message received, residual %d\n", |
| 2406 | HOSTNO, len); |
| 2407 | |
| 2408 | switch (extended_msg[2]) { |
| 2409 | case EXTENDED_SDTR: |
| 2410 | case EXTENDED_WDTR: |
| 2411 | case EXTENDED_MODIFY_DATA_POINTER: |
| 2412 | case EXTENDED_EXTENDED_IDENTIFY: |
| 2413 | tmp = 0; |
| 2414 | } |
| 2415 | } else if (len) { |
| 2416 | printk(KERN_NOTICE "scsi%d: error receiving " |
| 2417 | "extended message\n", HOSTNO); |
| 2418 | tmp = 0; |
| 2419 | } else { |
| 2420 | printk(KERN_NOTICE "scsi%d: extended message " |
| 2421 | "code %02x length %d is too long\n", |
| 2422 | HOSTNO, extended_msg[2], extended_msg[1]); |
| 2423 | tmp = 0; |
| 2424 | } |
| 2425 | /* Fall through to reject message */ |
| 2426 | |
| 2427 | /* |
| 2428 | * If we get something weird that we aren't expecting, |
| 2429 | * reject it. |
| 2430 | */ |
| 2431 | default: |
| 2432 | if (!tmp) { |
| 2433 | printk(KERN_DEBUG "scsi%d: rejecting message ", HOSTNO); |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 2434 | spi_print_msg(extended_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | printk("\n"); |
| 2436 | } else if (tmp != EXTENDED_MESSAGE) |
| 2437 | printk(KERN_DEBUG "scsi%d: rejecting unknown " |
| 2438 | "message %02x from target %d, lun %d\n", |
| 2439 | HOSTNO, tmp, cmd->device->id, cmd->device->lun); |
| 2440 | else |
| 2441 | printk(KERN_DEBUG "scsi%d: rejecting unknown " |
| 2442 | "extended message " |
| 2443 | "code %02x, length %d from target %d, lun %d\n", |
| 2444 | HOSTNO, extended_msg[1], extended_msg[0], |
| 2445 | cmd->device->id, cmd->device->lun); |
| 2446 | |
| 2447 | |
| 2448 | msgout = MESSAGE_REJECT; |
| 2449 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | |
| 2450 | ICR_ASSERT_ATN); |
| 2451 | break; |
| 2452 | } /* switch (tmp) */ |
| 2453 | break; |
| 2454 | case PHASE_MSGOUT: |
| 2455 | len = 1; |
| 2456 | data = &msgout; |
| 2457 | hostdata->last_message = msgout; |
| 2458 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2459 | if (msgout == ABORT) { |
| 2460 | #ifdef SUPPORT_TAGS |
| 2461 | cmd_free_tag( cmd ); |
| 2462 | #else |
| 2463 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2464 | #endif |
| 2465 | hostdata->connected = NULL; |
| 2466 | cmd->result = DID_ERROR << 16; |
| 2467 | #ifdef NCR5380_STATS |
| 2468 | collect_stats(hostdata, cmd); |
| 2469 | #endif |
| 2470 | cmd->scsi_done(cmd); |
| 2471 | NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask); |
| 2472 | return; |
| 2473 | } |
| 2474 | msgout = NOP; |
| 2475 | break; |
| 2476 | case PHASE_CMDOUT: |
| 2477 | len = cmd->cmd_len; |
| 2478 | data = cmd->cmnd; |
| 2479 | /* |
| 2480 | * XXX for performance reasons, on machines with a |
| 2481 | * PSEUDO-DMA architecture we should probably |
| 2482 | * use the dma transfer function. |
| 2483 | */ |
| 2484 | NCR5380_transfer_pio(instance, &phase, &len, |
| 2485 | &data); |
| 2486 | break; |
| 2487 | case PHASE_STATIN: |
| 2488 | len = 1; |
| 2489 | data = &tmp; |
| 2490 | NCR5380_transfer_pio(instance, &phase, &len, &data); |
| 2491 | cmd->SCp.Status = tmp; |
| 2492 | break; |
| 2493 | default: |
| 2494 | printk("scsi%d: unknown phase\n", HOSTNO); |
| 2495 | NCR_PRINT(NDEBUG_ANY); |
| 2496 | } /* switch(phase) */ |
| 2497 | } /* if (tmp * SR_REQ) */ |
| 2498 | } /* while (1) */ |
| 2499 | } |
| 2500 | |
| 2501 | /* |
| 2502 | * Function : void NCR5380_reselect (struct Scsi_Host *instance) |
| 2503 | * |
| 2504 | * Purpose : does reselection, initializing the instance->connected |
| 2505 | * field to point to the Scsi_Cmnd for which the I_T_L or I_T_L_Q |
| 2506 | * nexus has been reestablished, |
| 2507 | * |
| 2508 | * Inputs : instance - this instance of the NCR5380. |
| 2509 | * |
| 2510 | */ |
| 2511 | |
| 2512 | /* it might eventually prove necessary to do a dma setup on |
| 2513 | reselection, but it doesn't seem to be needed now -- sam */ |
| 2514 | |
| 2515 | static void NCR5380_reselect (struct Scsi_Host *instance) |
| 2516 | { |
| 2517 | SETUP_HOSTDATA(instance); |
| 2518 | unsigned char target_mask; |
| 2519 | unsigned char lun; |
| 2520 | #ifdef SUPPORT_TAGS |
| 2521 | unsigned char tag; |
| 2522 | #endif |
| 2523 | unsigned char msg[3]; |
| 2524 | Scsi_Cmnd *tmp = NULL, *prev; |
| 2525 | /* unsigned long flags; */ |
| 2526 | |
| 2527 | /* |
| 2528 | * Disable arbitration, etc. since the host adapter obviously |
| 2529 | * lost, and tell an interrupted NCR5380_select() to restart. |
| 2530 | */ |
| 2531 | |
| 2532 | NCR5380_write(MODE_REG, MR_BASE); |
| 2533 | hostdata->restart_select = 1; |
| 2534 | |
| 2535 | target_mask = NCR5380_read(CURRENT_SCSI_DATA_REG) & ~(hostdata->id_mask); |
| 2536 | |
| 2537 | RSL_PRINTK("scsi%d: reselect\n", HOSTNO); |
| 2538 | |
| 2539 | /* |
| 2540 | * At this point, we have detected that our SCSI ID is on the bus, |
| 2541 | * SEL is true and BSY was false for at least one bus settle delay |
| 2542 | * (400 ns). |
| 2543 | * |
| 2544 | * We must assert BSY ourselves, until the target drops the SEL |
| 2545 | * signal. |
| 2546 | */ |
| 2547 | |
| 2548 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_BSY); |
| 2549 | |
| 2550 | while (NCR5380_read(STATUS_REG) & SR_SEL); |
| 2551 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2552 | |
| 2553 | /* |
| 2554 | * Wait for target to go into MSGIN. |
| 2555 | */ |
| 2556 | |
| 2557 | while (!(NCR5380_read(STATUS_REG) & SR_REQ)); |
| 2558 | |
| 2559 | #if 1 |
| 2560 | // acknowledge toggle to MSGIN |
| 2561 | NCR5380_write(TARGET_COMMAND_REG, PHASE_SR_TO_TCR(PHASE_MSGIN)); |
| 2562 | |
| 2563 | // peek at the byte without really hitting the bus |
| 2564 | msg[0] = NCR5380_read(CURRENT_SCSI_DATA_REG); |
| 2565 | #endif |
| 2566 | |
| 2567 | if (!(msg[0] & 0x80)) { |
| 2568 | printk(KERN_DEBUG "scsi%d: expecting IDENTIFY message, got ", HOSTNO); |
Matthew Wilcox | 1abfd37 | 2005-12-15 16:22:01 -0500 | [diff] [blame] | 2569 | spi_print_msg(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2570 | do_abort(instance); |
| 2571 | return; |
| 2572 | } |
| 2573 | lun = (msg[0] & 0x07); |
| 2574 | |
| 2575 | /* |
| 2576 | * Find the command corresponding to the I_T_L or I_T_L_Q nexus we |
| 2577 | * just reestablished, and remove it from the disconnected queue. |
| 2578 | */ |
| 2579 | |
| 2580 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue, prev = NULL; |
| 2581 | tmp; prev = tmp, tmp = NEXT(tmp) ) { |
| 2582 | if ((target_mask == (1 << tmp->device->id)) && (lun == tmp->device->lun) |
| 2583 | #ifdef SUPPORT_TAGS |
| 2584 | && (tag == tmp->tag) |
| 2585 | #endif |
| 2586 | ) { |
| 2587 | if (prev) { |
| 2588 | REMOVE(prev, NEXT(prev), tmp, NEXT(tmp)); |
| 2589 | NEXT(prev) = NEXT(tmp); |
| 2590 | } else { |
| 2591 | REMOVE(-1, hostdata->disconnected_queue, tmp, NEXT(tmp)); |
| 2592 | hostdata->disconnected_queue = NEXT(tmp); |
| 2593 | } |
| 2594 | NEXT(tmp) = NULL; |
| 2595 | break; |
| 2596 | } |
| 2597 | } |
| 2598 | |
| 2599 | if (!tmp) { |
| 2600 | printk(KERN_WARNING "scsi%d: warning: target bitmask %02x lun %d " |
| 2601 | #ifdef SUPPORT_TAGS |
| 2602 | "tag %d " |
| 2603 | #endif |
| 2604 | "not in disconnected_queue.\n", |
| 2605 | HOSTNO, target_mask, lun |
| 2606 | #ifdef SUPPORT_TAGS |
| 2607 | , tag |
| 2608 | #endif |
| 2609 | ); |
| 2610 | /* |
| 2611 | * Since we have an established nexus that we can't do anything |
| 2612 | * with, we must abort it. |
| 2613 | */ |
| 2614 | do_abort(instance); |
| 2615 | return; |
| 2616 | } |
| 2617 | #if 1 |
| 2618 | /* engage dma setup for the command we just saw */ |
| 2619 | { |
| 2620 | void *d; |
| 2621 | unsigned long count; |
| 2622 | |
| 2623 | if (!tmp->SCp.this_residual && tmp->SCp.buffers_residual) { |
| 2624 | count = tmp->SCp.buffer->length; |
| 2625 | d = SGADDR(tmp->SCp.buffer); |
| 2626 | } else { |
| 2627 | count = tmp->SCp.this_residual; |
| 2628 | d = tmp->SCp.ptr; |
| 2629 | } |
| 2630 | #ifdef REAL_DMA |
| 2631 | /* setup this command for dma if not already */ |
| 2632 | if((count > SUN3_DMA_MINSIZE) && (sun3_dma_setup_done != tmp)) |
| 2633 | { |
| 2634 | sun3scsi_dma_setup(d, count, rq_data_dir(tmp->request)); |
| 2635 | sun3_dma_setup_done = tmp; |
| 2636 | } |
| 2637 | #endif |
| 2638 | } |
| 2639 | #endif |
| 2640 | |
| 2641 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_ACK); |
| 2642 | /* Accept message by clearing ACK */ |
| 2643 | NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE); |
| 2644 | |
| 2645 | #ifdef SUPPORT_TAGS |
| 2646 | /* If the phase is still MSGIN, the target wants to send some more |
| 2647 | * messages. In case it supports tagged queuing, this is probably a |
| 2648 | * SIMPLE_QUEUE_TAG for the I_T_L_Q nexus. |
| 2649 | */ |
| 2650 | tag = TAG_NONE; |
| 2651 | if (phase == PHASE_MSGIN && setup_use_tagged_queuing) { |
| 2652 | /* Accept previous IDENTIFY message by clearing ACK */ |
| 2653 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); |
| 2654 | len = 2; |
| 2655 | data = msg+1; |
| 2656 | if (!NCR5380_transfer_pio(instance, &phase, &len, &data) && |
| 2657 | msg[1] == SIMPLE_QUEUE_TAG) |
| 2658 | tag = msg[2]; |
| 2659 | TAG_PRINTK("scsi%d: target mask %02x, lun %d sent tag %d at " |
| 2660 | "reselection\n", HOSTNO, target_mask, lun, tag); |
| 2661 | } |
| 2662 | #endif |
| 2663 | |
| 2664 | hostdata->connected = tmp; |
| 2665 | RSL_PRINTK("scsi%d: nexus established, target = %d, lun = %d, tag = %d\n", |
| 2666 | HOSTNO, tmp->target, tmp->lun, tmp->tag); |
| 2667 | } |
| 2668 | |
| 2669 | |
| 2670 | /* |
| 2671 | * Function : int NCR5380_abort (Scsi_Cmnd *cmd) |
| 2672 | * |
| 2673 | * Purpose : abort a command |
| 2674 | * |
| 2675 | * Inputs : cmd - the Scsi_Cmnd to abort, code - code to set the |
| 2676 | * host byte of the result field to, if zero DID_ABORTED is |
| 2677 | * used. |
| 2678 | * |
| 2679 | * Returns : 0 - success, -1 on failure. |
| 2680 | * |
| 2681 | * XXX - there is no way to abort the command that is currently |
| 2682 | * connected, you have to wait for it to complete. If this is |
| 2683 | * a problem, we could implement longjmp() / setjmp(), setjmp() |
| 2684 | * called where the loop started in NCR5380_main(). |
| 2685 | */ |
| 2686 | |
| 2687 | static int NCR5380_abort (Scsi_Cmnd *cmd) |
| 2688 | { |
| 2689 | struct Scsi_Host *instance = cmd->device->host; |
| 2690 | SETUP_HOSTDATA(instance); |
| 2691 | Scsi_Cmnd *tmp, **prev; |
| 2692 | unsigned long flags; |
| 2693 | |
| 2694 | printk(KERN_NOTICE "scsi%d: aborting command\n", HOSTNO); |
| db9dff3 | 2005-04-03 14:53:59 -0500 | [diff] [blame] | 2695 | scsi_print_command(cmd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2696 | |
| 2697 | NCR5380_print_status (instance); |
| 2698 | |
| 2699 | local_irq_save(flags); |
| 2700 | |
| 2701 | ABRT_PRINTK("scsi%d: abort called basr 0x%02x, sr 0x%02x\n", HOSTNO, |
| 2702 | NCR5380_read(BUS_AND_STATUS_REG), |
| 2703 | NCR5380_read(STATUS_REG)); |
| 2704 | |
| 2705 | #if 1 |
| 2706 | /* |
| 2707 | * Case 1 : If the command is the currently executing command, |
| 2708 | * we'll set the aborted flag and return control so that |
| 2709 | * information transfer routine can exit cleanly. |
| 2710 | */ |
| 2711 | |
| 2712 | if (hostdata->connected == cmd) { |
| 2713 | |
| 2714 | ABRT_PRINTK("scsi%d: aborting connected command\n", HOSTNO); |
| 2715 | /* |
| 2716 | * We should perform BSY checking, and make sure we haven't slipped |
| 2717 | * into BUS FREE. |
| 2718 | */ |
| 2719 | |
| 2720 | /* NCR5380_write(INITIATOR_COMMAND_REG, ICR_ASSERT_ATN); */ |
| 2721 | /* |
| 2722 | * Since we can't change phases until we've completed the current |
| 2723 | * handshake, we have to source or sink a byte of data if the current |
| 2724 | * phase is not MSGOUT. |
| 2725 | */ |
| 2726 | |
| 2727 | /* |
| 2728 | * Return control to the executing NCR drive so we can clear the |
| 2729 | * aborted flag and get back into our main loop. |
| 2730 | */ |
| 2731 | |
| 2732 | if (do_abort(instance) == 0) { |
| 2733 | hostdata->aborted = 1; |
| 2734 | hostdata->connected = NULL; |
| 2735 | cmd->result = DID_ABORT << 16; |
| 2736 | #ifdef SUPPORT_TAGS |
| 2737 | cmd_free_tag( cmd ); |
| 2738 | #else |
| 2739 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2740 | #endif |
| 2741 | local_irq_restore(flags); |
| 2742 | cmd->scsi_done(cmd); |
| 2743 | return SCSI_ABORT_SUCCESS; |
| 2744 | } else { |
| 2745 | /* local_irq_restore(flags); */ |
| 2746 | printk("scsi%d: abort of connected command failed!\n", HOSTNO); |
| 2747 | return SCSI_ABORT_ERROR; |
| 2748 | } |
| 2749 | } |
| 2750 | #endif |
| 2751 | |
| 2752 | /* |
| 2753 | * Case 2 : If the command hasn't been issued yet, we simply remove it |
| 2754 | * from the issue queue. |
| 2755 | */ |
| 2756 | for (prev = (Scsi_Cmnd **) &(hostdata->issue_queue), |
| 2757 | tmp = (Scsi_Cmnd *) hostdata->issue_queue; |
| 2758 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) |
| 2759 | if (cmd == tmp) { |
| 2760 | REMOVE(5, *prev, tmp, NEXT(tmp)); |
| 2761 | (*prev) = NEXT(tmp); |
| 2762 | NEXT(tmp) = NULL; |
| 2763 | tmp->result = DID_ABORT << 16; |
| 2764 | local_irq_restore(flags); |
| 2765 | ABRT_PRINTK("scsi%d: abort removed command from issue queue.\n", |
| 2766 | HOSTNO); |
| 2767 | /* Tagged queuing note: no tag to free here, hasn't been assigned |
| 2768 | * yet... */ |
| 2769 | tmp->scsi_done(tmp); |
| 2770 | return SCSI_ABORT_SUCCESS; |
| 2771 | } |
| 2772 | |
| 2773 | /* |
| 2774 | * Case 3 : If any commands are connected, we're going to fail the abort |
| 2775 | * and let the high level SCSI driver retry at a later time or |
| 2776 | * issue a reset. |
| 2777 | * |
| 2778 | * Timeouts, and therefore aborted commands, will be highly unlikely |
| 2779 | * and handling them cleanly in this situation would make the common |
| 2780 | * case of noresets less efficient, and would pollute our code. So, |
| 2781 | * we fail. |
| 2782 | */ |
| 2783 | |
| 2784 | if (hostdata->connected) { |
| 2785 | local_irq_restore(flags); |
| 2786 | ABRT_PRINTK("scsi%d: abort failed, command connected.\n", HOSTNO); |
| 2787 | return SCSI_ABORT_SNOOZE; |
| 2788 | } |
| 2789 | |
| 2790 | /* |
| 2791 | * Case 4: If the command is currently disconnected from the bus, and |
| 2792 | * there are no connected commands, we reconnect the I_T_L or |
| 2793 | * I_T_L_Q nexus associated with it, go into message out, and send |
| 2794 | * an abort message. |
| 2795 | * |
| 2796 | * This case is especially ugly. In order to reestablish the nexus, we |
| 2797 | * need to call NCR5380_select(). The easiest way to implement this |
| 2798 | * function was to abort if the bus was busy, and let the interrupt |
| 2799 | * handler triggered on the SEL for reselect take care of lost arbitrations |
| 2800 | * where necessary, meaning interrupts need to be enabled. |
| 2801 | * |
| 2802 | * When interrupts are enabled, the queues may change - so we |
| 2803 | * can't remove it from the disconnected queue before selecting it |
| 2804 | * because that could cause a failure in hashing the nexus if that |
| 2805 | * device reselected. |
| 2806 | * |
| 2807 | * Since the queues may change, we can't use the pointers from when we |
| 2808 | * first locate it. |
| 2809 | * |
| 2810 | * So, we must first locate the command, and if NCR5380_select() |
| 2811 | * succeeds, then issue the abort, relocate the command and remove |
| 2812 | * it from the disconnected queue. |
| 2813 | */ |
| 2814 | |
| 2815 | for (tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; tmp; |
| 2816 | tmp = NEXT(tmp)) |
| 2817 | if (cmd == tmp) { |
| 2818 | local_irq_restore(flags); |
| 2819 | ABRT_PRINTK("scsi%d: aborting disconnected command.\n", HOSTNO); |
| 2820 | |
| 2821 | if (NCR5380_select (instance, cmd, (int) cmd->tag)) |
| 2822 | return SCSI_ABORT_BUSY; |
| 2823 | |
| 2824 | ABRT_PRINTK("scsi%d: nexus reestablished.\n", HOSTNO); |
| 2825 | |
| 2826 | do_abort (instance); |
| 2827 | |
| 2828 | local_irq_save(flags); |
| 2829 | for (prev = (Scsi_Cmnd **) &(hostdata->disconnected_queue), |
| 2830 | tmp = (Scsi_Cmnd *) hostdata->disconnected_queue; |
| 2831 | tmp; prev = NEXTADDR(tmp), tmp = NEXT(tmp) ) |
| 2832 | if (cmd == tmp) { |
| 2833 | REMOVE(5, *prev, tmp, NEXT(tmp)); |
| 2834 | *prev = NEXT(tmp); |
| 2835 | NEXT(tmp) = NULL; |
| 2836 | tmp->result = DID_ABORT << 16; |
| 2837 | /* We must unlock the tag/LUN immediately here, since the |
| 2838 | * target goes to BUS FREE and doesn't send us another |
| 2839 | * message (COMMAND_COMPLETE or the like) |
| 2840 | */ |
| 2841 | #ifdef SUPPORT_TAGS |
| 2842 | cmd_free_tag( tmp ); |
| 2843 | #else |
| 2844 | hostdata->busy[cmd->device->id] &= ~(1 << cmd->device->lun); |
| 2845 | #endif |
| 2846 | local_irq_restore(flags); |
| 2847 | tmp->scsi_done(tmp); |
| 2848 | return SCSI_ABORT_SUCCESS; |
| 2849 | } |
| 2850 | } |
| 2851 | |
| 2852 | /* |
| 2853 | * Case 5 : If we reached this point, the command was not found in any of |
| 2854 | * the queues. |
| 2855 | * |
| 2856 | * We probably reached this point because of an unlikely race condition |
| 2857 | * between the command completing successfully and the abortion code, |
| 2858 | * so we won't panic, but we will notify the user in case something really |
| 2859 | * broke. |
| 2860 | */ |
| 2861 | |
| 2862 | local_irq_restore(flags); |
| 2863 | printk(KERN_INFO "scsi%d: warning : SCSI command probably completed successfully\n" |
| 2864 | KERN_INFO " before abortion\n", HOSTNO); |
| 2865 | |
| 2866 | return SCSI_ABORT_NOT_RUNNING; |
| 2867 | } |
| 2868 | |
| 2869 | |
| 2870 | /* |
| 2871 | * Function : int NCR5380_bus_reset (Scsi_Cmnd *cmd) |
| 2872 | * |
| 2873 | * Purpose : reset the SCSI bus. |
| 2874 | * |
| 2875 | * Returns : SCSI_RESET_WAKEUP |
| 2876 | * |
| 2877 | */ |
| 2878 | |
| 2879 | static int NCR5380_bus_reset( Scsi_Cmnd *cmd) |
| 2880 | { |
| 2881 | SETUP_HOSTDATA(cmd->device->host); |
| 2882 | int i; |
| 2883 | unsigned long flags; |
| 2884 | #if 1 |
| 2885 | Scsi_Cmnd *connected, *disconnected_queue; |
| 2886 | #endif |
| 2887 | |
| 2888 | |
| 2889 | NCR5380_print_status (cmd->device->host); |
| 2890 | |
| 2891 | /* get in phase */ |
| 2892 | NCR5380_write( TARGET_COMMAND_REG, |
| 2893 | PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); |
| 2894 | /* assert RST */ |
| 2895 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); |
| 2896 | udelay (40); |
| 2897 | /* reset NCR registers */ |
| 2898 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); |
| 2899 | NCR5380_write( MODE_REG, MR_BASE ); |
| 2900 | NCR5380_write( TARGET_COMMAND_REG, 0 ); |
| 2901 | NCR5380_write( SELECT_ENABLE_REG, 0 ); |
| 2902 | /* ++roman: reset interrupt condition! otherwise no interrupts don't get |
| 2903 | * through anymore ... */ |
| 2904 | (void)NCR5380_read( RESET_PARITY_INTERRUPT_REG ); |
| 2905 | |
| 2906 | #if 1 /* XXX Should now be done by midlevel code, but it's broken XXX */ |
| 2907 | /* XXX see below XXX */ |
| 2908 | |
| 2909 | /* MSch: old-style reset: actually abort all command processing here */ |
| 2910 | |
| 2911 | /* After the reset, there are no more connected or disconnected commands |
| 2912 | * and no busy units; to avoid problems with re-inserting the commands |
| 2913 | * into the issue_queue (via scsi_done()), the aborted commands are |
| 2914 | * remembered in local variables first. |
| 2915 | */ |
| 2916 | local_irq_save(flags); |
| 2917 | connected = (Scsi_Cmnd *)hostdata->connected; |
| 2918 | hostdata->connected = NULL; |
| 2919 | disconnected_queue = (Scsi_Cmnd *)hostdata->disconnected_queue; |
| 2920 | hostdata->disconnected_queue = NULL; |
| 2921 | #ifdef SUPPORT_TAGS |
| 2922 | free_all_tags(); |
| 2923 | #endif |
| 2924 | for( i = 0; i < 8; ++i ) |
| 2925 | hostdata->busy[i] = 0; |
| 2926 | #ifdef REAL_DMA |
| 2927 | hostdata->dma_len = 0; |
| 2928 | #endif |
| 2929 | local_irq_restore(flags); |
| 2930 | |
| 2931 | /* In order to tell the mid-level code which commands were aborted, |
| 2932 | * set the command status to DID_RESET and call scsi_done() !!! |
| 2933 | * This ultimately aborts processing of these commands in the mid-level. |
| 2934 | */ |
| 2935 | |
| 2936 | if ((cmd = connected)) { |
| 2937 | ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
| 2938 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
| 2939 | cmd->scsi_done( cmd ); |
| 2940 | } |
| 2941 | |
| 2942 | for (i = 0; (cmd = disconnected_queue); ++i) { |
| 2943 | disconnected_queue = NEXT(cmd); |
| 2944 | NEXT(cmd) = NULL; |
| 2945 | cmd->result = (cmd->result & 0xffff) | (DID_RESET << 16); |
| 2946 | cmd->scsi_done( cmd ); |
| 2947 | } |
| 2948 | if (i > 0) |
| 2949 | ABRT_PRINTK("scsi: reset aborted %d disconnected command(s)\n", i); |
| 2950 | |
| 2951 | |
| 2952 | /* since all commands have been explicitly terminated, we need to tell |
| 2953 | * the midlevel code that the reset was SUCCESSFUL, and there is no |
| 2954 | * need to 'wake up' the commands by a request_sense |
| 2955 | */ |
| 2956 | return SCSI_RESET_SUCCESS | SCSI_RESET_BUS_RESET; |
| 2957 | #else /* 1 */ |
| 2958 | |
| 2959 | /* MSch: new-style reset handling: let the mid-level do what it can */ |
| 2960 | |
| 2961 | /* ++guenther: MID-LEVEL IS STILL BROKEN. |
| 2962 | * Mid-level is supposed to requeue all commands that were active on the |
| 2963 | * various low-level queues. In fact it does this, but that's not enough |
| 2964 | * because all these commands are subject to timeout. And if a timeout |
| 2965 | * happens for any removed command, *_abort() is called but all queues |
| 2966 | * are now empty. Abort then gives up the falcon lock, which is fatal, |
| 2967 | * since the mid-level will queue more commands and must have the lock |
| 2968 | * (it's all happening inside timer interrupt handler!!). |
| 2969 | * Even worse, abort will return NOT_RUNNING for all those commands not |
| 2970 | * on any queue, so they won't be retried ... |
| 2971 | * |
| 2972 | * Conclusion: either scsi.c disables timeout for all resetted commands |
| 2973 | * immediately, or we lose! As of linux-2.0.20 it doesn't. |
| 2974 | */ |
| 2975 | |
| 2976 | /* After the reset, there are no more connected or disconnected commands |
| 2977 | * and no busy units; so clear the low-level status here to avoid |
| 2978 | * conflicts when the mid-level code tries to wake up the affected |
| 2979 | * commands! |
| 2980 | */ |
| 2981 | |
| 2982 | if (hostdata->issue_queue) |
| 2983 | ABRT_PRINTK("scsi%d: reset aborted issued command(s)\n", H_NO(cmd)); |
| 2984 | if (hostdata->connected) |
| 2985 | ABRT_PRINTK("scsi%d: reset aborted a connected command\n", H_NO(cmd)); |
| 2986 | if (hostdata->disconnected_queue) |
| 2987 | ABRT_PRINTK("scsi%d: reset aborted disconnected command(s)\n", H_NO(cmd)); |
| 2988 | |
| 2989 | local_irq_save(flags); |
| 2990 | hostdata->issue_queue = NULL; |
| 2991 | hostdata->connected = NULL; |
| 2992 | hostdata->disconnected_queue = NULL; |
| 2993 | #ifdef SUPPORT_TAGS |
| 2994 | free_all_tags(); |
| 2995 | #endif |
| 2996 | for( i = 0; i < 8; ++i ) |
| 2997 | hostdata->busy[i] = 0; |
| 2998 | #ifdef REAL_DMA |
| 2999 | hostdata->dma_len = 0; |
| 3000 | #endif |
| 3001 | local_irq_restore(flags); |
| 3002 | |
| 3003 | /* we did no complete reset of all commands, so a wakeup is required */ |
| 3004 | return SCSI_RESET_WAKEUP | SCSI_RESET_BUS_RESET; |
| 3005 | #endif /* 1 */ |
| 3006 | } |
| 3007 | |
| 3008 | /* Local Variables: */ |
| 3009 | /* tab-width: 8 */ |
| 3010 | /* End: */ |