1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/acorn/scsi/acornscsi.c 4 * 5 * Acorn SCSI 3 driver 6 * By R.M.King. 7 * 8 * Abandoned using the Select and Transfer command since there were 9 * some nasty races between our software and the target devices that 10 * were not easy to solve, and the device errata had a lot of entries 11 * for this command, some of them quite nasty... 12 * 13 * Changelog: 14 * 26-Sep-1997 RMK Re-jigged to use the queue module. 15 * Re-coded state machine to be based on driver 16 * state not scsi state. Should be easier to debug. 17 * Added acornscsi_release to clean up properly. 18 * Updated proc/scsi reporting. 19 * 05-Oct-1997 RMK Implemented writing to SCSI devices. 20 * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/ 21 * reconnect race condition causing a warning message. 22 * 12-Oct-1997 RMK Added catch for re-entering interrupt routine. 23 * 15-Oct-1997 RMK Improved handling of commands. 24 * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h. 25 * 13-Dec-1998 RMK Better abort code and command handling. Extra state 26 * transitions added to allow dodgy devices to work. 27 */ 28 #define DEBUG_NO_WRITE 1 29 #define DEBUG_QUEUES 2 30 #define DEBUG_DMA 4 31 #define DEBUG_ABORT 8 32 #define DEBUG_DISCON 16 33 #define DEBUG_CONNECT 32 34 #define DEBUG_PHASES 64 35 #define DEBUG_WRITE 128 36 #define DEBUG_LINK 256 37 #define DEBUG_MESSAGES 512 38 #define DEBUG_RESET 1024 39 #define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\ 40 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\ 41 DEBUG_DMA|DEBUG_QUEUES) 42 43 /* DRIVER CONFIGURATION 44 * 45 * SCSI-II Tagged queue support. 46 * 47 * I don't have any SCSI devices that support it, so it is totally untested 48 * (except to make sure that it doesn't interfere with any non-tagging 49 * devices). It is not fully implemented either - what happens when a 50 * tagging device reconnects??? 51 * 52 * You can tell if you have a device that supports tagged queueing my 53 * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported 54 * as '2 TAG'. 55 * 56 * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config 57 * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug, 58 * comment out the undef. 59 */ 60 #undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 61 /* 62 * SCSI-II Synchronous transfer support. 63 * 64 * Tried and tested... 65 * 66 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) 67 * SDTR_PERIOD - period of REQ signal (min=125, max=1020) 68 * DEFAULT_PERIOD - default REQ period. 69 */ 70 #define SDTR_SIZE 12 71 #define SDTR_PERIOD 125 72 #define DEFAULT_PERIOD 500 73 74 /* 75 * Debugging information 76 * 77 * DEBUG - bit mask from list above 78 * DEBUG_TARGET - is defined to the target number if you want to debug 79 * a specific target. [only recon/write/dma]. 80 */ 81 #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) 82 /* only allow writing to SCSI device 0 */ 83 #define NO_WRITE 0xFE 84 /*#define DEBUG_TARGET 2*/ 85 /* 86 * Select timeout time (in 10ms units) 87 * 88 * This is the timeout used between the start of selection and the WD33C93 89 * chip deciding that the device isn't responding. 90 */ 91 #define TIMEOUT_TIME 10 92 /* 93 * Define this if you want to have verbose explanation of SCSI 94 * status/messages. 95 */ 96 #undef CONFIG_ACORNSCSI_CONSTANTS 97 /* 98 * Define this if you want to use the on board DMAC [don't remove this option] 99 * If not set, then use PIO mode (not currently supported). 100 */ 101 #define USE_DMAC 102 103 /* 104 * ==================================================================================== 105 */ 106 107 #ifdef DEBUG_TARGET 108 #define DBG(cmd,xxx...) \ 109 if (cmd->device->id == DEBUG_TARGET) { \ 110 xxx; \ 111 } 112 #else 113 #define DBG(cmd,xxx...) xxx 114 #endif 115 116 #include <linux/module.h> 117 #include <linux/kernel.h> 118 #include <linux/string.h> 119 #include <linux/signal.h> 120 #include <linux/errno.h> 121 #include <linux/proc_fs.h> 122 #include <linux/ioport.h> 123 #include <linux/blkdev.h> 124 #include <linux/delay.h> 125 #include <linux/interrupt.h> 126 #include <linux/init.h> 127 #include <linux/bitops.h> 128 #include <linux/stringify.h> 129 #include <linux/io.h> 130 131 #include <asm/ecard.h> 132 133 #include "../scsi.h" 134 #include <scsi/scsi_dbg.h> 135 #include <scsi/scsi_host.h> 136 #include <scsi/scsi_transport_spi.h> 137 #include "acornscsi.h" 138 #include "msgqueue.h" 139 #include "scsi.h" 140 141 #include <scsi/scsicam.h> 142 143 #define VER_MAJOR 2 144 #define VER_MINOR 0 145 #define VER_PATCH 6 146 147 #ifdef USE_DMAC 148 /* 149 * DMAC setup parameters 150 */ 151 #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) 152 #define INIT_DEVCON1 (DEVCON1_BHLD) 153 #define DMAC_READ (MODECON_READ) 154 #define DMAC_WRITE (MODECON_WRITE) 155 #define INIT_SBICDMA (CTRL_DMABURST) 156 157 #define scsi_xferred have_data_in 158 159 /* 160 * Size of on-board DMA buffer 161 */ 162 #define DMAC_BUFFER_SIZE 65536 163 #endif 164 165 #define STATUS_BUFFER_TO_PRINT 24 166 167 unsigned int sdtr_period = SDTR_PERIOD; 168 unsigned int sdtr_size = SDTR_SIZE; 169 170 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 171 unsigned int result); 172 static int acornscsi_reconnect_finish(AS_Host *host); 173 static void acornscsi_dma_cleanup(AS_Host *host); 174 static void acornscsi_abortcmd(AS_Host *host, unsigned char tag); 175 176 /* ==================================================================================== 177 * Miscellaneous 178 */ 179 180 /* Offsets from MEMC base */ 181 #define SBIC_REGIDX 0x2000 182 #define SBIC_REGVAL 0x2004 183 #define DMAC_OFFSET 0x3000 184 185 /* Offsets from FAST IOC base */ 186 #define INT_REG 0x2000 187 #define PAGE_REG 0x3000 188 189 static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value) 190 { 191 writeb(reg, host->base + SBIC_REGIDX); 192 writeb(value, host->base + SBIC_REGVAL); 193 } 194 195 static inline int sbic_arm_read(AS_Host *host, unsigned int reg) 196 { 197 if(reg == SBIC_ASR) 198 return readl(host->base + SBIC_REGIDX) & 255; 199 writeb(reg, host->base + SBIC_REGIDX); 200 return readl(host->base + SBIC_REGVAL) & 255; 201 } 202 203 #define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL) 204 #define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL) 205 206 #ifdef USE_DMAC 207 #define dmac_read(host,reg) \ 208 readb((host)->base + DMAC_OFFSET + ((reg) << 2)) 209 210 #define dmac_write(host,reg,value) \ 211 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); }) 212 213 #define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG) 214 215 static inline unsigned int dmac_address(AS_Host *host) 216 { 217 return dmac_read(host, DMAC_TXADRHI) << 16 | 218 dmac_read(host, DMAC_TXADRMD) << 8 | 219 dmac_read(host, DMAC_TXADRLO); 220 } 221 222 static 223 void acornscsi_dumpdma(AS_Host *host, char *where) 224 { 225 unsigned int mode, addr, len; 226 227 mode = dmac_read(host, DMAC_MODECON); 228 addr = dmac_address(host); 229 len = dmac_read(host, DMAC_TXCNTHI) << 8 | 230 dmac_read(host, DMAC_TXCNTLO); 231 232 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ", 233 host->host->host_no, where, 234 mode, addr, (len + 1) & 0xffff, 235 dmac_read(host, DMAC_MASKREG)); 236 237 printk("DMA @%06x, ", host->dma.start_addr); 238 printk("BH @%p +%04x, ", host->scsi.SCp.ptr, 239 host->scsi.SCp.this_residual); 240 printk("DT @+%04x ST @+%04x", host->dma.transferred, 241 host->scsi.SCp.scsi_xferred); 242 printk("\n"); 243 } 244 #endif 245 246 static 247 unsigned long acornscsi_sbic_xfcount(AS_Host *host) 248 { 249 unsigned long length; 250 251 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16; 252 length |= sbic_arm_readnext(host) << 8; 253 length |= sbic_arm_readnext(host); 254 255 return length; 256 } 257 258 static int 259 acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg) 260 { 261 int asr; 262 263 do { 264 asr = sbic_arm_read(host, SBIC_ASR); 265 266 if ((asr & stat_mask) == stat) 267 return 0; 268 269 udelay(1); 270 } while (--timeout); 271 272 printk("scsi%d: timeout while %s\n", host->host->host_no, msg); 273 274 return -1; 275 } 276 277 static 278 int acornscsi_sbic_issuecmd(AS_Host *host, int command) 279 { 280 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command")) 281 return -1; 282 283 sbic_arm_write(host, SBIC_CMND, command); 284 285 return 0; 286 } 287 288 static void 289 acornscsi_csdelay(unsigned int cs) 290 { 291 unsigned long target_jiffies, flags; 292 293 target_jiffies = jiffies + 1 + cs * HZ / 100; 294 295 local_save_flags(flags); 296 local_irq_enable(); 297 298 while (time_before(jiffies, target_jiffies)) barrier(); 299 300 local_irq_restore(flags); 301 } 302 303 static 304 void acornscsi_resetcard(AS_Host *host) 305 { 306 unsigned int i, timeout; 307 308 /* assert reset line */ 309 host->card.page_reg = 0x80; 310 writeb(host->card.page_reg, host->fast + PAGE_REG); 311 312 /* wait 3 cs. SCSI standard says 25ms. */ 313 acornscsi_csdelay(3); 314 315 host->card.page_reg = 0; 316 writeb(host->card.page_reg, host->fast + PAGE_REG); 317 318 /* 319 * Should get a reset from the card 320 */ 321 timeout = 1000; 322 do { 323 if (readb(host->fast + INT_REG) & 8) 324 break; 325 udelay(1); 326 } while (--timeout); 327 328 if (timeout == 0) 329 printk("scsi%d: timeout while resetting card\n", 330 host->host->host_no); 331 332 sbic_arm_read(host, SBIC_ASR); 333 sbic_arm_read(host, SBIC_SSR); 334 335 /* setup sbic - WD33C93A */ 336 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 337 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 338 339 /* 340 * Command should cause a reset interrupt 341 */ 342 timeout = 1000; 343 do { 344 if (readb(host->fast + INT_REG) & 8) 345 break; 346 udelay(1); 347 } while (--timeout); 348 349 if (timeout == 0) 350 printk("scsi%d: timeout while resetting card\n", 351 host->host->host_no); 352 353 sbic_arm_read(host, SBIC_ASR); 354 if (sbic_arm_read(host, SBIC_SSR) != 0x01) 355 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n", 356 host->host->host_no); 357 358 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 359 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 360 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 361 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 362 363 host->card.page_reg = 0x40; 364 writeb(host->card.page_reg, host->fast + PAGE_REG); 365 366 /* setup dmac - uPC71071 */ 367 dmac_write(host, DMAC_INIT, 0); 368 #ifdef USE_DMAC 369 dmac_write(host, DMAC_INIT, INIT_8BIT); 370 dmac_write(host, DMAC_CHANNEL, CHANNEL_0); 371 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0); 372 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1); 373 #endif 374 375 host->SCpnt = NULL; 376 host->scsi.phase = PHASE_IDLE; 377 host->scsi.disconnectable = 0; 378 379 memset(host->busyluns, 0, sizeof(host->busyluns)); 380 381 for (i = 0; i < 8; i++) { 382 host->device[i].sync_state = SYNC_NEGOCIATE; 383 host->device[i].disconnect_ok = 1; 384 } 385 386 /* wait 25 cs. SCSI standard says 250ms. */ 387 acornscsi_csdelay(25); 388 } 389 390 /*============================================================================================= 391 * Utility routines (eg. debug) 392 */ 393 #ifdef CONFIG_ACORNSCSI_CONSTANTS 394 static char *acornscsi_interrupttype[] = { 395 "rst", "suc", "p/a", "3", 396 "term", "5", "6", "7", 397 "serv", "9", "a", "b", 398 "c", "d", "e", "f" 399 }; 400 401 static signed char acornscsi_map[] = { 402 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 403 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11, 404 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 405 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 406 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11, 407 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 408 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 409 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 410 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 411 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 412 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 413 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 415 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 416 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 417 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 418 }; 419 420 static char *acornscsi_interruptcode[] = { 421 /* 0 */ 422 "reset - normal mode", /* 00 */ 423 "reset - advanced mode", /* 01 */ 424 425 /* 2 */ 426 "sel", /* 11 */ 427 "sel+xfer", /* 16 */ 428 "data-out", /* 18 */ 429 "data-in", /* 19 */ 430 "cmd", /* 1A */ 431 "stat", /* 1B */ 432 "??-out", /* 1C */ 433 "??-in", /* 1D */ 434 "msg-out", /* 1E */ 435 "msg-in", /* 1F */ 436 437 /* 12 */ 438 "/ACK asserted", /* 20 */ 439 "save-data-ptr", /* 21 */ 440 "{re}sel", /* 22 */ 441 442 /* 15 */ 443 "inv cmd", /* 40 */ 444 "unexpected disconnect", /* 41 */ 445 "sel timeout", /* 42 */ 446 "P err", /* 43 */ 447 "P err+ATN", /* 44 */ 448 "bad status byte", /* 47 */ 449 450 /* 21 */ 451 "resel, no id", /* 80 */ 452 "resel", /* 81 */ 453 "discon", /* 85 */ 454 }; 455 456 static 457 void print_scsi_status(unsigned int ssr) 458 { 459 if (acornscsi_map[ssr] != -1) 460 printk("%s:%s", 461 acornscsi_interrupttype[(ssr >> 4)], 462 acornscsi_interruptcode[acornscsi_map[ssr]]); 463 else 464 printk("%X:%X", ssr >> 4, ssr & 0x0f); 465 } 466 #endif 467 468 static 469 void print_sbic_status(int asr, int ssr, int cmdphase) 470 { 471 #ifdef CONFIG_ACORNSCSI_CONSTANTS 472 printk("sbic: %c%c%c%c%c%c ", 473 asr & ASR_INT ? 'I' : 'i', 474 asr & ASR_LCI ? 'L' : 'l', 475 asr & ASR_BSY ? 'B' : 'b', 476 asr & ASR_CIP ? 'C' : 'c', 477 asr & ASR_PE ? 'P' : 'p', 478 asr & ASR_DBR ? 'D' : 'd'); 479 printk("scsi: "); 480 print_scsi_status(ssr); 481 printk(" ph %02X\n", cmdphase); 482 #else 483 printk("sbic: %02X scsi: %X:%X ph: %02X\n", 484 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase); 485 #endif 486 } 487 488 static void 489 acornscsi_dumplogline(AS_Host *host, int target, int line) 490 { 491 unsigned long prev; 492 signed int ptr; 493 494 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT; 495 if (ptr < 0) 496 ptr += STATUS_BUFFER_SIZE; 497 498 printk("%c: %3s:", target == 8 ? 'H' : '0' + target, 499 line == 0 ? "ph" : line == 1 ? "ssr" : "int"); 500 501 prev = host->status[target][ptr].when; 502 503 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 504 unsigned long time_diff; 505 506 if (!host->status[target][ptr].when) 507 continue; 508 509 switch (line) { 510 case 0: 511 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ', 512 host->status[target][ptr].ph); 513 break; 514 515 case 1: 516 printk(" %02X", host->status[target][ptr].ssr); 517 break; 518 519 case 2: 520 time_diff = host->status[target][ptr].when - prev; 521 prev = host->status[target][ptr].when; 522 if (time_diff == 0) 523 printk("==^"); 524 else if (time_diff >= 100) 525 printk(" "); 526 else 527 printk(" %02ld", time_diff); 528 break; 529 } 530 } 531 532 printk("\n"); 533 } 534 535 static 536 void acornscsi_dumplog(AS_Host *host, int target) 537 { 538 do { 539 acornscsi_dumplogline(host, target, 0); 540 acornscsi_dumplogline(host, target, 1); 541 acornscsi_dumplogline(host, target, 2); 542 543 if (target == 8) 544 break; 545 546 target = 8; 547 } while (1); 548 } 549 550 static 551 char acornscsi_target(AS_Host *host) 552 { 553 if (host->SCpnt) 554 return '0' + host->SCpnt->device->id; 555 return 'H'; 556 } 557 558 /* 559 * Prototype: cmdtype_t acornscsi_cmdtype(int command) 560 * Purpose : differentiate READ from WRITE from other commands 561 * Params : command - command to interpret 562 * Returns : CMD_READ - command reads data, 563 * CMD_WRITE - command writes data, 564 * CMD_MISC - everything else 565 */ 566 static inline 567 cmdtype_t acornscsi_cmdtype(int command) 568 { 569 switch (command) { 570 case WRITE_6: case WRITE_10: case WRITE_12: 571 return CMD_WRITE; 572 case READ_6: case READ_10: case READ_12: 573 return CMD_READ; 574 default: 575 return CMD_MISC; 576 } 577 } 578 579 /* 580 * Prototype: int acornscsi_datadirection(int command) 581 * Purpose : differentiate between commands that have a DATA IN phase 582 * and a DATA OUT phase 583 * Params : command - command to interpret 584 * Returns : DATADIR_OUT - data out phase expected 585 * DATADIR_IN - data in phase expected 586 */ 587 static 588 datadir_t acornscsi_datadirection(int command) 589 { 590 switch (command) { 591 case CHANGE_DEFINITION: case COMPARE: case COPY: 592 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT: 593 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER: 594 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: 595 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: 596 case WRITE_6: case WRITE_10: case WRITE_VERIFY: 597 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME: 598 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12: 599 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW: 600 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: 601 return DATADIR_OUT; 602 default: 603 return DATADIR_IN; 604 } 605 } 606 607 /* 608 * Purpose : provide values for synchronous transfers with 33C93. 609 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 610 * Modified by Russell King for 8MHz WD33C93A 611 */ 612 static struct sync_xfer_tbl { 613 unsigned int period_ns; 614 unsigned char reg_value; 615 } sync_xfer_table[] = { 616 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 }, 617 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 }, 618 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 } 619 }; 620 621 /* 622 * Prototype: int acornscsi_getperiod(unsigned char syncxfer) 623 * Purpose : period for the synchronous transfer setting 624 * Params : syncxfer SYNCXFER register value 625 * Returns : period in ns. 626 */ 627 static 628 int acornscsi_getperiod(unsigned char syncxfer) 629 { 630 int i; 631 632 syncxfer &= 0xf0; 633 if (syncxfer == 0x10) 634 syncxfer = 0; 635 636 for (i = 1; sync_xfer_table[i].period_ns; i++) 637 if (syncxfer == sync_xfer_table[i].reg_value) 638 return sync_xfer_table[i].period_ns; 639 return 0; 640 } 641 642 /* 643 * Prototype: int round_period(unsigned int period) 644 * Purpose : return index into above table for a required REQ period 645 * Params : period - time (ns) for REQ 646 * Returns : table index 647 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 648 */ 649 static inline 650 int round_period(unsigned int period) 651 { 652 int i; 653 654 for (i = 1; sync_xfer_table[i].period_ns; i++) { 655 if ((period <= sync_xfer_table[i].period_ns) && 656 (period > sync_xfer_table[i - 1].period_ns)) 657 return i; 658 } 659 return 7; 660 } 661 662 /* 663 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 664 * Purpose : calculate value for 33c93s SYNC register 665 * Params : period - time (ns) for REQ 666 * offset - offset in bytes between REQ/ACK 667 * Returns : value for SYNC register 668 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 669 */ 670 static 671 unsigned char __maybe_unused calc_sync_xfer(unsigned int period, 672 unsigned int offset) 673 { 674 return sync_xfer_table[round_period(period)].reg_value | 675 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE); 676 } 677 678 /* ==================================================================================== 679 * Command functions 680 */ 681 /* 682 * Function: acornscsi_kick(AS_Host *host) 683 * Purpose : kick next command to interface 684 * Params : host - host to send command to 685 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING 686 * Notes : interrupts are always disabled! 687 */ 688 static 689 intr_ret_t acornscsi_kick(AS_Host *host) 690 { 691 int from_queue = 0; 692 struct scsi_cmnd *SCpnt; 693 694 /* first check to see if a command is waiting to be executed */ 695 SCpnt = host->origSCpnt; 696 host->origSCpnt = NULL; 697 698 /* retrieve next command */ 699 if (!SCpnt) { 700 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns); 701 if (!SCpnt) 702 return INTR_IDLE; 703 704 from_queue = 1; 705 } 706 707 if (host->scsi.disconnectable && host->SCpnt) { 708 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 709 host->scsi.disconnectable = 0; 710 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 711 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n", 712 host->host->host_no, acornscsi_target(host))); 713 #endif 714 host->SCpnt = NULL; 715 } 716 717 /* 718 * If we have an interrupt pending, then we may have been reselected. 719 * In this case, we don't want to write to the registers 720 */ 721 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) { 722 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id); 723 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN); 724 } 725 726 /* 727 * claim host busy - all of these must happen atomically wrt 728 * our interrupt routine. Failure means command loss. 729 */ 730 host->scsi.phase = PHASE_CONNECTING; 731 host->SCpnt = SCpnt; 732 host->scsi.SCp = SCpnt->SCp; 733 host->dma.xfer_setup = 0; 734 host->dma.xfer_required = 0; 735 host->dma.xfer_done = 0; 736 737 #if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT)) 738 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n", 739 host->host->host_no, '0' + SCpnt->device->id, 740 SCpnt->cmnd[0])); 741 #endif 742 743 if (from_queue) { 744 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 745 /* 746 * tagged queueing - allocate a new tag to this command 747 */ 748 if (SCpnt->device->simple_tags) { 749 SCpnt->device->current_tag += 1; 750 if (SCpnt->device->current_tag == 0) 751 SCpnt->device->current_tag = 1; 752 SCpnt->tag = SCpnt->device->current_tag; 753 } else 754 #endif 755 set_bit(SCpnt->device->id * 8 + 756 (u8)(SCpnt->device->lun & 0x07), host->busyluns); 757 758 host->stats.removes += 1; 759 760 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { 761 case CMD_WRITE: 762 host->stats.writes += 1; 763 break; 764 case CMD_READ: 765 host->stats.reads += 1; 766 break; 767 case CMD_MISC: 768 host->stats.miscs += 1; 769 break; 770 } 771 } 772 773 return INTR_PROCESSING; 774 } 775 776 /* 777 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) 778 * Purpose : complete processing for command 779 * Params : host - interface that completed 780 * result - driver byte of result 781 */ 782 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 783 unsigned int result) 784 { 785 struct scsi_cmnd *SCpnt = *SCpntp; 786 787 /* clean up */ 788 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 789 790 host->stats.fins += 1; 791 792 if (SCpnt) { 793 *SCpntp = NULL; 794 795 acornscsi_dma_cleanup(host); 796 797 set_host_byte(SCpnt, result); 798 if (result == DID_OK) 799 scsi_msg_to_host_byte(SCpnt, host->scsi.SCp.Message); 800 set_status_byte(SCpnt, host->scsi.SCp.Status); 801 802 /* 803 * In theory, this should not happen. In practice, it seems to. 804 * Only trigger an error if the device attempts to report all happy 805 * but with untransferred buffers... If we don't do something, then 806 * data loss will occur. Should we check SCpnt->underflow here? 807 * It doesn't appear to be set to something meaningful by the higher 808 * levels all the time. 809 */ 810 if (result == DID_OK) { 811 int xfer_warn = 0; 812 813 if (SCpnt->underflow == 0) { 814 if (host->scsi.SCp.ptr && 815 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC) 816 xfer_warn = 1; 817 } else { 818 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow || 819 host->scsi.SCp.scsi_xferred != host->dma.transferred) 820 xfer_warn = 1; 821 } 822 823 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6) 824 * Targets which break data transfers into multiple 825 * connections shall end each successful connection 826 * (except possibly the last) with a SAVE DATA 827 * POINTER - DISCONNECT message sequence. 828 * 829 * This makes it difficult to ensure that a transfer has 830 * completed. If we reach the end of a transfer during 831 * the command, then we can only have finished the transfer. 832 * therefore, if we seem to have some data remaining, this 833 * is not a problem. 834 */ 835 if (host->dma.xfer_done) 836 xfer_warn = 0; 837 838 if (xfer_warn) { 839 switch (get_status_byte(SCpnt)) { 840 case SAM_STAT_CHECK_CONDITION: 841 case SAM_STAT_COMMAND_TERMINATED: 842 case SAM_STAT_BUSY: 843 case SAM_STAT_TASK_SET_FULL: 844 case SAM_STAT_RESERVATION_CONFLICT: 845 break; 846 847 default: 848 scmd_printk(KERN_ERR, SCpnt, 849 "incomplete data transfer detected: " 850 "result=%08X", SCpnt->result); 851 scsi_print_command(SCpnt); 852 acornscsi_dumpdma(host, "done"); 853 acornscsi_dumplog(host, SCpnt->device->id); 854 set_host_byte(SCpnt, DID_ERROR); 855 } 856 } 857 } 858 859 if (!SCpnt->scsi_done) 860 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); 861 862 clear_bit(SCpnt->device->id * 8 + 863 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 864 865 SCpnt->scsi_done(SCpnt); 866 } else 867 printk("scsi%d: null command in acornscsi_done", host->host->host_no); 868 869 host->scsi.phase = PHASE_IDLE; 870 } 871 872 /* ==================================================================================== 873 * DMA routines 874 */ 875 /* 876 * Purpose : update SCSI Data Pointer 877 * Notes : this will only be one SG entry or less 878 */ 879 static 880 void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) 881 { 882 SCp->ptr += length; 883 SCp->this_residual -= length; 884 885 if (SCp->this_residual == 0 && next_SCp(SCp) == 0) 886 host->dma.xfer_done = 1; 887 } 888 889 /* 890 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, 891 * unsigned int start_addr, unsigned int length) 892 * Purpose : read data from DMA RAM 893 * Params : host - host to transfer from 894 * ptr - DRAM address 895 * start_addr - host mem address 896 * length - number of bytes to transfer 897 * Notes : this will only be one SG entry or less 898 */ 899 static 900 void acornscsi_data_read(AS_Host *host, char *ptr, 901 unsigned int start_addr, unsigned int length) 902 { 903 extern void __acornscsi_in(void __iomem *, char *buf, int len); 904 unsigned int page, offset, len = length; 905 906 page = (start_addr >> 12); 907 offset = start_addr & ((1 << 12) - 1); 908 909 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 910 911 while (len > 0) { 912 unsigned int this_len; 913 914 if (len + offset > (1 << 12)) 915 this_len = (1 << 12) - offset; 916 else 917 this_len = len; 918 919 __acornscsi_in(host->base + (offset << 1), ptr, this_len); 920 921 offset += this_len; 922 ptr += this_len; 923 len -= this_len; 924 925 if (offset == (1 << 12)) { 926 offset = 0; 927 page ++; 928 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 929 } 930 } 931 writeb(host->card.page_reg, host->fast + PAGE_REG); 932 } 933 934 /* 935 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, 936 * unsigned int start_addr, unsigned int length) 937 * Purpose : write data to DMA RAM 938 * Params : host - host to transfer from 939 * ptr - DRAM address 940 * start_addr - host mem address 941 * length - number of bytes to transfer 942 * Notes : this will only be one SG entry or less 943 */ 944 static 945 void acornscsi_data_write(AS_Host *host, char *ptr, 946 unsigned int start_addr, unsigned int length) 947 { 948 extern void __acornscsi_out(void __iomem *, char *buf, int len); 949 unsigned int page, offset, len = length; 950 951 page = (start_addr >> 12); 952 offset = start_addr & ((1 << 12) - 1); 953 954 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 955 956 while (len > 0) { 957 unsigned int this_len; 958 959 if (len + offset > (1 << 12)) 960 this_len = (1 << 12) - offset; 961 else 962 this_len = len; 963 964 __acornscsi_out(host->base + (offset << 1), ptr, this_len); 965 966 offset += this_len; 967 ptr += this_len; 968 len -= this_len; 969 970 if (offset == (1 << 12)) { 971 offset = 0; 972 page ++; 973 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 974 } 975 } 976 writeb(host->card.page_reg, host->fast + PAGE_REG); 977 } 978 979 /* ========================================================================================= 980 * On-board DMA routines 981 */ 982 #ifdef USE_DMAC 983 /* 984 * Prototype: void acornscsi_dmastop(AS_Host *host) 985 * Purpose : stop all DMA 986 * Params : host - host on which to stop DMA 987 * Notes : This is called when leaving DATA IN/OUT phase, 988 * or when interface is RESET 989 */ 990 static inline 991 void acornscsi_dma_stop(AS_Host *host) 992 { 993 dmac_write(host, DMAC_MASKREG, MASK_ON); 994 dmac_clearintr(host); 995 996 #if (DEBUG & DEBUG_DMA) 997 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); 998 #endif 999 } 1000 1001 /* 1002 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1003 * Purpose : setup DMA controller for data transfer 1004 * Params : host - host to setup 1005 * direction - data transfer direction 1006 * Notes : This is called when entering DATA I/O phase, not 1007 * while we're in a DATA I/O phase 1008 */ 1009 static 1010 void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1011 { 1012 unsigned int address, length, mode; 1013 1014 host->dma.direction = direction; 1015 1016 dmac_write(host, DMAC_MASKREG, MASK_ON); 1017 1018 if (direction == DMA_OUT) { 1019 #if (DEBUG & DEBUG_NO_WRITE) 1020 if (NO_WRITE & (1 << host->SCpnt->device->id)) { 1021 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", 1022 host->host->host_no, acornscsi_target(host)); 1023 return; 1024 } 1025 #endif 1026 mode = DMAC_WRITE; 1027 } else 1028 mode = DMAC_READ; 1029 1030 /* 1031 * Allocate some buffer space, limited to half the buffer size 1032 */ 1033 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1034 if (length) { 1035 host->dma.start_addr = address = host->dma.free_addr; 1036 host->dma.free_addr = (host->dma.free_addr + length) & 1037 (DMAC_BUFFER_SIZE - 1); 1038 1039 /* 1040 * Transfer data to DMA memory 1041 */ 1042 if (direction == DMA_OUT) 1043 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1044 length); 1045 1046 length -= 1; 1047 dmac_write(host, DMAC_TXCNTLO, length); 1048 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1049 dmac_write(host, DMAC_TXADRLO, address); 1050 dmac_write(host, DMAC_TXADRMD, address >> 8); 1051 dmac_write(host, DMAC_TXADRHI, 0); 1052 dmac_write(host, DMAC_MODECON, mode); 1053 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1054 1055 #if (DEBUG & DEBUG_DMA) 1056 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); 1057 #endif 1058 host->dma.xfer_setup = 1; 1059 } 1060 } 1061 1062 /* 1063 * Function: void acornscsi_dma_cleanup(AS_Host *host) 1064 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct 1065 * Params : host - host to finish 1066 * Notes : This is called when a command is: 1067 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONNECT 1068 * : This must not return until all transfers are completed. 1069 */ 1070 static 1071 void acornscsi_dma_cleanup(AS_Host *host) 1072 { 1073 dmac_write(host, DMAC_MASKREG, MASK_ON); 1074 dmac_clearintr(host); 1075 1076 /* 1077 * Check for a pending transfer 1078 */ 1079 if (host->dma.xfer_required) { 1080 host->dma.xfer_required = 0; 1081 if (host->dma.direction == DMA_IN) 1082 acornscsi_data_read(host, host->dma.xfer_ptr, 1083 host->dma.xfer_start, host->dma.xfer_length); 1084 } 1085 1086 /* 1087 * Has a transfer been setup? 1088 */ 1089 if (host->dma.xfer_setup) { 1090 unsigned int transferred; 1091 1092 host->dma.xfer_setup = 0; 1093 1094 #if (DEBUG & DEBUG_DMA) 1095 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi")); 1096 #endif 1097 1098 /* 1099 * Calculate number of bytes transferred from DMA. 1100 */ 1101 transferred = dmac_address(host) - host->dma.start_addr; 1102 host->dma.transferred += transferred; 1103 1104 if (host->dma.direction == DMA_IN) 1105 acornscsi_data_read(host, host->scsi.SCp.ptr, 1106 host->dma.start_addr, transferred); 1107 1108 /* 1109 * Update SCSI pointers 1110 */ 1111 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1112 #if (DEBUG & DEBUG_DMA) 1113 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo")); 1114 #endif 1115 } 1116 } 1117 1118 /* 1119 * Function: void acornscsi_dmacintr(AS_Host *host) 1120 * Purpose : handle interrupts from DMAC device 1121 * Params : host - host to process 1122 * Notes : If reading, we schedule the read to main memory & 1123 * allow the transfer to continue. 1124 * : If writing, we fill the onboard DMA memory from main 1125 * memory. 1126 * : Called whenever DMAC finished it's current transfer. 1127 */ 1128 static 1129 void acornscsi_dma_intr(AS_Host *host) 1130 { 1131 unsigned int address, length, transferred; 1132 1133 #if (DEBUG & DEBUG_DMA) 1134 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti")); 1135 #endif 1136 1137 dmac_write(host, DMAC_MASKREG, MASK_ON); 1138 dmac_clearintr(host); 1139 1140 /* 1141 * Calculate amount transferred via DMA 1142 */ 1143 transferred = dmac_address(host) - host->dma.start_addr; 1144 host->dma.transferred += transferred; 1145 1146 /* 1147 * Schedule DMA transfer off board 1148 */ 1149 if (host->dma.direction == DMA_IN) { 1150 host->dma.xfer_start = host->dma.start_addr; 1151 host->dma.xfer_length = transferred; 1152 host->dma.xfer_ptr = host->scsi.SCp.ptr; 1153 host->dma.xfer_required = 1; 1154 } 1155 1156 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1157 1158 /* 1159 * Allocate some buffer space, limited to half the on-board RAM size 1160 */ 1161 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1162 if (length) { 1163 host->dma.start_addr = address = host->dma.free_addr; 1164 host->dma.free_addr = (host->dma.free_addr + length) & 1165 (DMAC_BUFFER_SIZE - 1); 1166 1167 /* 1168 * Transfer data to DMA memory 1169 */ 1170 if (host->dma.direction == DMA_OUT) 1171 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1172 length); 1173 1174 length -= 1; 1175 dmac_write(host, DMAC_TXCNTLO, length); 1176 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1177 dmac_write(host, DMAC_TXADRLO, address); 1178 dmac_write(host, DMAC_TXADRMD, address >> 8); 1179 dmac_write(host, DMAC_TXADRHI, 0); 1180 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1181 1182 #if (DEBUG & DEBUG_DMA) 1183 DBG(host->SCpnt, acornscsi_dumpdma(host, "into")); 1184 #endif 1185 } else { 1186 host->dma.xfer_setup = 0; 1187 #if 0 1188 /* 1189 * If the interface still wants more, then this is an error. 1190 * We give it another byte, but we also attempt to raise an 1191 * attention condition. We continue giving one byte until 1192 * the device recognises the attention. 1193 */ 1194 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) { 1195 acornscsi_abortcmd(host, host->SCpnt->tag); 1196 1197 dmac_write(host, DMAC_TXCNTLO, 0); 1198 dmac_write(host, DMAC_TXCNTHI, 0); 1199 dmac_write(host, DMAC_TXADRLO, 0); 1200 dmac_write(host, DMAC_TXADRMD, 0); 1201 dmac_write(host, DMAC_TXADRHI, 0); 1202 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1203 } 1204 #endif 1205 } 1206 } 1207 1208 /* 1209 * Function: void acornscsi_dma_xfer(AS_Host *host) 1210 * Purpose : transfer data between AcornSCSI and memory 1211 * Params : host - host to process 1212 */ 1213 static 1214 void acornscsi_dma_xfer(AS_Host *host) 1215 { 1216 host->dma.xfer_required = 0; 1217 1218 if (host->dma.direction == DMA_IN) 1219 acornscsi_data_read(host, host->dma.xfer_ptr, 1220 host->dma.xfer_start, host->dma.xfer_length); 1221 } 1222 1223 /* 1224 * Function: void acornscsi_dma_adjust(AS_Host *host) 1225 * Purpose : adjust DMA pointers & count for bytes transferred to 1226 * SBIC but not SCSI bus. 1227 * Params : host - host to adjust DMA count for 1228 */ 1229 static 1230 void acornscsi_dma_adjust(AS_Host *host) 1231 { 1232 if (host->dma.xfer_setup) { 1233 signed long transferred; 1234 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1235 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); 1236 #endif 1237 /* 1238 * Calculate correct DMA address - DMA is ahead of SCSI bus while 1239 * writing. 1240 * host->scsi.SCp.scsi_xferred is the number of bytes 1241 * actually transferred to/from the SCSI bus. 1242 * host->dma.transferred is the number of bytes transferred 1243 * over DMA since host->dma.start_addr was last set. 1244 * 1245 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred 1246 * - host->dma.transferred 1247 */ 1248 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; 1249 if (transferred < 0) 1250 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", 1251 host->host->host_no, acornscsi_target(host), transferred); 1252 else if (transferred == 0) 1253 host->dma.xfer_setup = 0; 1254 else { 1255 transferred += host->dma.start_addr; 1256 dmac_write(host, DMAC_TXADRLO, transferred); 1257 dmac_write(host, DMAC_TXADRMD, transferred >> 8); 1258 dmac_write(host, DMAC_TXADRHI, transferred >> 16); 1259 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1260 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); 1261 #endif 1262 } 1263 } 1264 } 1265 #endif 1266 1267 /* ========================================================================================= 1268 * Data I/O 1269 */ 1270 static int 1271 acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) 1272 { 1273 unsigned int asr, timeout = max_timeout; 1274 int my_ptr = *ptr; 1275 1276 while (my_ptr < len) { 1277 asr = sbic_arm_read(host, SBIC_ASR); 1278 1279 if (asr & ASR_DBR) { 1280 timeout = max_timeout; 1281 1282 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); 1283 } else if (asr & ASR_INT) 1284 break; 1285 else if (--timeout == 0) 1286 break; 1287 udelay(1); 1288 } 1289 1290 *ptr = my_ptr; 1291 1292 return (timeout == 0) ? -1 : 0; 1293 } 1294 1295 /* 1296 * Function: void acornscsi_sendcommand(AS_Host *host) 1297 * Purpose : send a command to a target 1298 * Params : host - host which is connected to target 1299 */ 1300 static void 1301 acornscsi_sendcommand(AS_Host *host) 1302 { 1303 struct scsi_cmnd *SCpnt = host->SCpnt; 1304 1305 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1306 sbic_arm_writenext(host, 0); 1307 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); 1308 1309 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1310 1311 if (acornscsi_write_pio(host, SCpnt->cmnd, 1312 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) 1313 printk("scsi%d: timeout while sending command\n", host->host->host_no); 1314 1315 host->scsi.phase = PHASE_COMMAND; 1316 } 1317 1318 static 1319 void acornscsi_sendmessage(AS_Host *host) 1320 { 1321 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); 1322 unsigned int msgnr; 1323 struct message *msg; 1324 1325 #if (DEBUG & DEBUG_MESSAGES) 1326 printk("scsi%d.%c: sending message ", 1327 host->host->host_no, acornscsi_target(host)); 1328 #endif 1329 1330 switch (message_length) { 1331 case 0: 1332 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1333 1334 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); 1335 1336 sbic_arm_write(host, SBIC_DATA, NOP); 1337 1338 host->scsi.last_message = NOP; 1339 #if (DEBUG & DEBUG_MESSAGES) 1340 printk("NOP"); 1341 #endif 1342 break; 1343 1344 case 1: 1345 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1346 msg = msgqueue_getmsg(&host->scsi.msgs, 0); 1347 1348 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); 1349 1350 sbic_arm_write(host, SBIC_DATA, msg->msg[0]); 1351 1352 host->scsi.last_message = msg->msg[0]; 1353 #if (DEBUG & DEBUG_MESSAGES) 1354 spi_print_msg(msg->msg); 1355 #endif 1356 break; 1357 1358 default: 1359 /* 1360 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) 1361 * 'When a target sends this (MESSAGE_REJECT) message, it 1362 * shall change to MESSAGE IN phase and send this message 1363 * prior to requesting additional message bytes from the 1364 * initiator. This provides an interlock so that the 1365 * initiator can determine which message byte is rejected. 1366 */ 1367 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1368 sbic_arm_writenext(host, 0); 1369 sbic_arm_writenext(host, message_length); 1370 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1371 1372 msgnr = 0; 1373 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { 1374 unsigned int i; 1375 #if (DEBUG & DEBUG_MESSAGES) 1376 spi_print_msg(msg); 1377 #endif 1378 i = 0; 1379 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) 1380 printk("scsi%d: timeout while sending message\n", host->host->host_no); 1381 1382 host->scsi.last_message = msg->msg[0]; 1383 if (msg->msg[0] == EXTENDED_MESSAGE) 1384 host->scsi.last_message |= msg->msg[2] << 8; 1385 1386 if (i != msg->length) 1387 break; 1388 } 1389 break; 1390 } 1391 #if (DEBUG & DEBUG_MESSAGES) 1392 printk("\n"); 1393 #endif 1394 } 1395 1396 /* 1397 * Function: void acornscsi_readstatusbyte(AS_Host *host) 1398 * Purpose : Read status byte from connected target 1399 * Params : host - host connected to target 1400 */ 1401 static 1402 void acornscsi_readstatusbyte(AS_Host *host) 1403 { 1404 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); 1405 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); 1406 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); 1407 } 1408 1409 /* 1410 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) 1411 * Purpose : Read one message byte from connected target 1412 * Params : host - host connected to target 1413 */ 1414 static 1415 unsigned char acornscsi_readmessagebyte(AS_Host *host) 1416 { 1417 unsigned char message; 1418 1419 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1420 1421 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); 1422 1423 message = sbic_arm_read(host, SBIC_DATA); 1424 1425 /* wait for MSGIN-XFER-PAUSED */ 1426 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); 1427 1428 sbic_arm_read(host, SBIC_SSR); 1429 1430 return message; 1431 } 1432 1433 /* 1434 * Function: void acornscsi_message(AS_Host *host) 1435 * Purpose : Read complete message from connected target & action message 1436 * Params : host - host connected to target 1437 */ 1438 static 1439 void acornscsi_message(AS_Host *host) 1440 { 1441 unsigned char message[16]; 1442 unsigned int msgidx = 0, msglen = 1; 1443 1444 do { 1445 message[msgidx] = acornscsi_readmessagebyte(host); 1446 1447 switch (msgidx) { 1448 case 0: 1449 if (message[0] == EXTENDED_MESSAGE || 1450 (message[0] >= 0x20 && message[0] <= 0x2f)) 1451 msglen = 2; 1452 break; 1453 1454 case 1: 1455 if (message[0] == EXTENDED_MESSAGE) 1456 msglen += message[msgidx]; 1457 break; 1458 } 1459 msgidx += 1; 1460 if (msgidx < msglen) { 1461 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1462 1463 /* wait for next msg-in */ 1464 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); 1465 sbic_arm_read(host, SBIC_SSR); 1466 } 1467 } while (msgidx < msglen); 1468 1469 #if (DEBUG & DEBUG_MESSAGES) 1470 printk("scsi%d.%c: message in: ", 1471 host->host->host_no, acornscsi_target(host)); 1472 spi_print_msg(message); 1473 printk("\n"); 1474 #endif 1475 1476 if (host->scsi.phase == PHASE_RECONNECTED) { 1477 /* 1478 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1479 * 'Whenever a target reconnects to an initiator to continue 1480 * a tagged I/O process, the SIMPLE QUEUE TAG message shall 1481 * be sent immediately following the IDENTIFY message...' 1482 */ 1483 if (message[0] == SIMPLE_QUEUE_TAG) 1484 host->scsi.reconnected.tag = message[1]; 1485 if (acornscsi_reconnect_finish(host)) 1486 host->scsi.phase = PHASE_MSGIN; 1487 } 1488 1489 switch (message[0]) { 1490 case ABORT_TASK_SET: 1491 case ABORT_TASK: 1492 case COMMAND_COMPLETE: 1493 if (host->scsi.phase != PHASE_STATUSIN) { 1494 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", 1495 host->host->host_no, acornscsi_target(host)); 1496 acornscsi_dumplog(host, host->SCpnt->device->id); 1497 } 1498 host->scsi.phase = PHASE_DONE; 1499 host->scsi.SCp.Message = message[0]; 1500 break; 1501 1502 case SAVE_POINTERS: 1503 /* 1504 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) 1505 * 'The SAVE DATA POINTER message is sent from a target to 1506 * direct the initiator to copy the active data pointer to 1507 * the saved data pointer for the current I/O process. 1508 */ 1509 acornscsi_dma_cleanup(host); 1510 host->SCpnt->SCp = host->scsi.SCp; 1511 host->SCpnt->SCp.sent_command = 0; 1512 host->scsi.phase = PHASE_MSGIN; 1513 break; 1514 1515 case RESTORE_POINTERS: 1516 /* 1517 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) 1518 * 'The RESTORE POINTERS message is sent from a target to 1519 * direct the initiator to copy the most recently saved 1520 * command, data, and status pointers for the I/O process 1521 * to the corresponding active pointers. The command and 1522 * status pointers shall be restored to the beginning of 1523 * the present command and status areas.' 1524 */ 1525 acornscsi_dma_cleanup(host); 1526 host->scsi.SCp = host->SCpnt->SCp; 1527 host->scsi.phase = PHASE_MSGIN; 1528 break; 1529 1530 case DISCONNECT: 1531 /* 1532 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) 1533 * 'On those occasions when an error or exception condition occurs 1534 * and the target elects to repeat the information transfer, the 1535 * target may repeat the transfer either issuing a RESTORE POINTERS 1536 * message or by disconnecting without issuing a SAVE POINTERS 1537 * message. When reconnection is completed, the most recent 1538 * saved pointer values are restored.' 1539 */ 1540 acornscsi_dma_cleanup(host); 1541 host->scsi.phase = PHASE_DISCONNECT; 1542 break; 1543 1544 case MESSAGE_REJECT: 1545 #if 0 /* this isn't needed any more */ 1546 /* 1547 * If we were negociating sync transfer, we don't yet know if 1548 * this REJECT is for the sync transfer or for the tagged queue/wide 1549 * transfer. Re-initiate sync transfer negotiation now, and if 1550 * we got a REJECT in response to SDTR, then it'll be set to DONE. 1551 */ 1552 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) 1553 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; 1554 #endif 1555 1556 /* 1557 * If we have any messages waiting to go out, then assert ATN now 1558 */ 1559 if (msgqueue_msglength(&host->scsi.msgs)) 1560 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1561 1562 switch (host->scsi.last_message) { 1563 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1564 case HEAD_OF_QUEUE_TAG: 1565 case ORDERED_QUEUE_TAG: 1566 case SIMPLE_QUEUE_TAG: 1567 /* 1568 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1569 * If a target does not implement tagged queuing and a queue tag 1570 * message is received, it shall respond with a MESSAGE REJECT 1571 * message and accept the I/O process as if it were untagged. 1572 */ 1573 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n", 1574 host->host->host_no, acornscsi_target(host)); 1575 host->SCpnt->device->simple_tags = 0; 1576 set_bit(host->SCpnt->device->id * 8 + 1577 (u8)(host->SCpnt->device->lun & 0x7), host->busyluns); 1578 break; 1579 #endif 1580 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): 1581 /* 1582 * Target can't handle synchronous transfers 1583 */ 1584 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", 1585 host->host->host_no, acornscsi_target(host)); 1586 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; 1587 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; 1588 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1589 break; 1590 1591 default: 1592 break; 1593 } 1594 break; 1595 1596 case SIMPLE_QUEUE_TAG: 1597 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ 1598 printk("scsi%d.%c: reconnect queue tag %02X\n", 1599 host->host->host_no, acornscsi_target(host), 1600 message[1]); 1601 break; 1602 1603 case EXTENDED_MESSAGE: 1604 switch (message[2]) { 1605 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1606 case EXTENDED_SDTR: 1607 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { 1608 /* 1609 * We requested synchronous transfers. This isn't quite right... 1610 * We can only say if this succeeded if we proceed on to execute the 1611 * command from this message. If we get a MESSAGE PARITY ERROR, 1612 * and the target retries fail, then we fallback to asynchronous mode 1613 */ 1614 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; 1615 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", 1616 host->host->host_no, acornscsi_target(host), 1617 message[4], message[3] * 4); 1618 host->device[host->SCpnt->device->id].sync_xfer = 1619 calc_sync_xfer(message[3] * 4, message[4]); 1620 } else { 1621 unsigned char period, length; 1622 /* 1623 * Target requested synchronous transfers. The agreement is only 1624 * to be in operation AFTER the target leaves message out phase. 1625 */ 1626 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1627 period = max_t(unsigned int, message[3], sdtr_period / 4); 1628 length = min_t(unsigned int, message[4], sdtr_size); 1629 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, 1630 EXTENDED_SDTR, period, length); 1631 host->device[host->SCpnt->device->id].sync_xfer = 1632 calc_sync_xfer(period * 4, length); 1633 } 1634 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1635 break; 1636 #else 1637 /* We do not accept synchronous transfers. Respond with a 1638 * MESSAGE_REJECT. 1639 */ 1640 #endif 1641 1642 case EXTENDED_WDTR: 1643 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT 1644 * to a wide data transfer request. 1645 */ 1646 default: 1647 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1648 msgqueue_flush(&host->scsi.msgs); 1649 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1650 break; 1651 } 1652 break; 1653 1654 default: /* reject message */ 1655 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", 1656 host->host->host_no, acornscsi_target(host), 1657 message[0]); 1658 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1659 msgqueue_flush(&host->scsi.msgs); 1660 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1661 host->scsi.phase = PHASE_MSGIN; 1662 break; 1663 } 1664 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1665 } 1666 1667 /* 1668 * Function: int acornscsi_buildmessages(AS_Host *host) 1669 * Purpose : build the connection messages for a host 1670 * Params : host - host to add messages to 1671 */ 1672 static 1673 void acornscsi_buildmessages(AS_Host *host) 1674 { 1675 #if 0 1676 /* does the device need resetting? */ 1677 if (cmd_reset) { 1678 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); 1679 return; 1680 } 1681 #endif 1682 1683 msgqueue_addmsg(&host->scsi.msgs, 1, 1684 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, 1685 host->SCpnt->device->lun)); 1686 1687 #if 0 1688 /* does the device need the current command aborted */ 1689 if (cmd_aborted) { 1690 acornscsi_abortcmd(host->SCpnt->tag); 1691 return; 1692 } 1693 #endif 1694 1695 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1696 if (host->SCpnt->tag) { 1697 unsigned int tag_type; 1698 1699 if (host->SCpnt->cmnd[0] == REQUEST_SENSE || 1700 host->SCpnt->cmnd[0] == TEST_UNIT_READY || 1701 host->SCpnt->cmnd[0] == INQUIRY) 1702 tag_type = HEAD_OF_QUEUE_TAG; 1703 else 1704 tag_type = SIMPLE_QUEUE_TAG; 1705 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag); 1706 } 1707 #endif 1708 1709 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1710 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { 1711 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; 1712 msgqueue_addmsg(&host->scsi.msgs, 5, 1713 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1714 sdtr_period / 4, sdtr_size); 1715 } 1716 #endif 1717 } 1718 1719 /* 1720 * Function: int acornscsi_starttransfer(AS_Host *host) 1721 * Purpose : transfer data to/from connected target 1722 * Params : host - host to which target is connected 1723 * Returns : 0 if failure 1724 */ 1725 static 1726 int acornscsi_starttransfer(AS_Host *host) 1727 { 1728 int residual; 1729 1730 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { 1731 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", 1732 host->host->host_no, acornscsi_target(host)); 1733 return 0; 1734 } 1735 1736 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; 1737 1738 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1739 sbic_arm_writenext(host, residual >> 16); 1740 sbic_arm_writenext(host, residual >> 8); 1741 sbic_arm_writenext(host, residual); 1742 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1743 return 1; 1744 } 1745 1746 /* ========================================================================================= 1747 * Connection & Disconnection 1748 */ 1749 /* 1750 * Function : acornscsi_reconnect(AS_Host *host) 1751 * Purpose : reconnect a previously disconnected command 1752 * Params : host - host specific data 1753 * Remarks : SCSI spec says: 1754 * 'The set of active pointers is restored from the set 1755 * of saved pointers upon reconnection of the I/O process' 1756 */ 1757 static 1758 int acornscsi_reconnect(AS_Host *host) 1759 { 1760 unsigned int target, lun, ok = 0; 1761 1762 target = sbic_arm_read(host, SBIC_SOURCEID); 1763 1764 if (!(target & 8)) 1765 printk(KERN_ERR "scsi%d: invalid source id after reselection " 1766 "- device fault?\n", 1767 host->host->host_no); 1768 1769 target &= 7; 1770 1771 if (host->SCpnt && !host->scsi.disconnectable) { 1772 printk(KERN_ERR "scsi%d.%d: reconnected while command in " 1773 "progress to target %d?\n", 1774 host->host->host_no, target, host->SCpnt->device->id); 1775 host->SCpnt = NULL; 1776 } 1777 1778 lun = sbic_arm_read(host, SBIC_DATA) & 7; 1779 1780 host->scsi.reconnected.target = target; 1781 host->scsi.reconnected.lun = lun; 1782 host->scsi.reconnected.tag = 0; 1783 1784 if (host->scsi.disconnectable && host->SCpnt && 1785 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun) 1786 ok = 1; 1787 1788 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun)) 1789 ok = 1; 1790 1791 ADD_STATUS(target, 0x81, host->scsi.phase, 0); 1792 1793 if (ok) { 1794 host->scsi.phase = PHASE_RECONNECTED; 1795 } else { 1796 /* this doesn't seem to work */ 1797 printk(KERN_ERR "scsi%d.%c: reselected with no command " 1798 "to reconnect with\n", 1799 host->host->host_no, '0' + target); 1800 acornscsi_dumplog(host, target); 1801 acornscsi_abortcmd(host, 0); 1802 if (host->SCpnt) { 1803 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1804 host->SCpnt = NULL; 1805 } 1806 } 1807 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1808 return !ok; 1809 } 1810 1811 /* 1812 * Function: int acornscsi_reconnect_finish(AS_Host *host) 1813 * Purpose : finish reconnecting a command 1814 * Params : host - host to complete 1815 * Returns : 0 if failed 1816 */ 1817 static 1818 int acornscsi_reconnect_finish(AS_Host *host) 1819 { 1820 if (host->scsi.disconnectable && host->SCpnt) { 1821 host->scsi.disconnectable = 0; 1822 if (host->SCpnt->device->id == host->scsi.reconnected.target && 1823 host->SCpnt->device->lun == host->scsi.reconnected.lun && 1824 host->SCpnt->tag == host->scsi.reconnected.tag) { 1825 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1826 DBG(host->SCpnt, printk("scsi%d.%c: reconnected", 1827 host->host->host_no, acornscsi_target(host))); 1828 #endif 1829 } else { 1830 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1831 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1832 DBG(host->SCpnt, printk("scsi%d.%c: had to move command " 1833 "to disconnected queue\n", 1834 host->host->host_no, acornscsi_target(host))); 1835 #endif 1836 host->SCpnt = NULL; 1837 } 1838 } 1839 if (!host->SCpnt) { 1840 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected, 1841 host->scsi.reconnected.target, 1842 host->scsi.reconnected.lun, 1843 host->scsi.reconnected.tag); 1844 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1845 DBG(host->SCpnt, printk("scsi%d.%c: had to get command", 1846 host->host->host_no, acornscsi_target(host))); 1847 #endif 1848 } 1849 1850 if (!host->SCpnt) 1851 acornscsi_abortcmd(host, host->scsi.reconnected.tag); 1852 else { 1853 /* 1854 * Restore data pointer from SAVED pointers. 1855 */ 1856 host->scsi.SCp = host->SCpnt->SCp; 1857 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1858 printk(", data pointers: [%p, %X]", 1859 host->scsi.SCp.ptr, host->scsi.SCp.this_residual); 1860 #endif 1861 } 1862 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1863 printk("\n"); 1864 #endif 1865 1866 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1867 1868 return host->SCpnt != NULL; 1869 } 1870 1871 /* 1872 * Function: void acornscsi_disconnect_unexpected(AS_Host *host) 1873 * Purpose : handle an unexpected disconnect 1874 * Params : host - host on which disconnect occurred 1875 */ 1876 static 1877 void acornscsi_disconnect_unexpected(AS_Host *host) 1878 { 1879 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n", 1880 host->host->host_no, acornscsi_target(host)); 1881 #if (DEBUG & DEBUG_ABORT) 1882 acornscsi_dumplog(host, 8); 1883 #endif 1884 1885 acornscsi_done(host, &host->SCpnt, DID_ERROR); 1886 } 1887 1888 /* 1889 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag) 1890 * Purpose : abort a currently executing command 1891 * Params : host - host with connected command to abort 1892 * tag - tag to abort 1893 */ 1894 static 1895 void acornscsi_abortcmd(AS_Host *host, unsigned char tag) 1896 { 1897 host->scsi.phase = PHASE_ABORTED; 1898 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); 1899 1900 msgqueue_flush(&host->scsi.msgs); 1901 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1902 if (tag) 1903 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag); 1904 else 1905 #endif 1906 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); 1907 } 1908 1909 /* ========================================================================================== 1910 * Interrupt routines. 1911 */ 1912 /* 1913 * Function: int acornscsi_sbicintr(AS_Host *host) 1914 * Purpose : handle interrupts from SCSI device 1915 * Params : host - host to process 1916 * Returns : INTR_PROCESS if expecting another SBIC interrupt 1917 * INTR_IDLE if no interrupt 1918 * INTR_NEXT_COMMAND if we have finished processing the command 1919 */ 1920 static 1921 intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq) 1922 { 1923 unsigned int asr, ssr; 1924 1925 asr = sbic_arm_read(host, SBIC_ASR); 1926 if (!(asr & ASR_INT)) 1927 return INTR_IDLE; 1928 1929 ssr = sbic_arm_read(host, SBIC_SSR); 1930 1931 #if (DEBUG & DEBUG_PHASES) 1932 print_sbic_status(asr, ssr, host->scsi.phase); 1933 #endif 1934 1935 ADD_STATUS(8, ssr, host->scsi.phase, in_irq); 1936 1937 if (host->SCpnt && !host->scsi.disconnectable) 1938 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 1939 1940 switch (ssr) { 1941 case 0x00: /* reset state - not advanced */ 1942 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n", 1943 host->host->host_no); 1944 /* setup sbic - WD33C93A */ 1945 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 1946 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 1947 return INTR_IDLE; 1948 1949 case 0x01: /* reset state - advanced */ 1950 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 1951 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 1952 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 1953 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 1954 msgqueue_flush(&host->scsi.msgs); 1955 return INTR_IDLE; 1956 1957 case 0x41: /* unexpected disconnect aborted command */ 1958 acornscsi_disconnect_unexpected(host); 1959 return INTR_NEXT_COMMAND; 1960 } 1961 1962 switch (host->scsi.phase) { 1963 case PHASE_CONNECTING: /* STATE: command removed from issue queue */ 1964 switch (ssr) { 1965 case 0x11: /* -> PHASE_CONNECTED */ 1966 /* BUS FREE -> SELECTION */ 1967 host->scsi.phase = PHASE_CONNECTED; 1968 msgqueue_flush(&host->scsi.msgs); 1969 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1970 /* 33C93 gives next interrupt indicating bus phase */ 1971 asr = sbic_arm_read(host, SBIC_ASR); 1972 if (!(asr & ASR_INT)) 1973 break; 1974 ssr = sbic_arm_read(host, SBIC_SSR); 1975 ADD_STATUS(8, ssr, host->scsi.phase, 1); 1976 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1); 1977 goto connected; 1978 1979 case 0x42: /* select timed out */ 1980 /* -> PHASE_IDLE */ 1981 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT); 1982 return INTR_NEXT_COMMAND; 1983 1984 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 1985 /* BUS FREE -> RESELECTION */ 1986 host->origSCpnt = host->SCpnt; 1987 host->SCpnt = NULL; 1988 msgqueue_flush(&host->scsi.msgs); 1989 acornscsi_reconnect(host); 1990 break; 1991 1992 default: 1993 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n", 1994 host->host->host_no, acornscsi_target(host), ssr); 1995 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 1996 acornscsi_abortcmd(host, host->SCpnt->tag); 1997 } 1998 return INTR_PROCESSING; 1999 2000 connected: 2001 case PHASE_CONNECTED: /* STATE: device selected ok */ 2002 switch (ssr) { 2003 #ifdef NONSTANDARD 2004 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2005 /* SELECTION -> COMMAND */ 2006 acornscsi_sendcommand(host); 2007 break; 2008 2009 case 0x8b: /* -> PHASE_STATUS */ 2010 /* SELECTION -> STATUS */ 2011 acornscsi_readstatusbyte(host); 2012 host->scsi.phase = PHASE_STATUSIN; 2013 break; 2014 #endif 2015 2016 case 0x8e: /* -> PHASE_MSGOUT */ 2017 /* SELECTION ->MESSAGE OUT */ 2018 host->scsi.phase = PHASE_MSGOUT; 2019 acornscsi_buildmessages(host); 2020 acornscsi_sendmessage(host); 2021 break; 2022 2023 /* these should not happen */ 2024 case 0x85: /* target disconnected */ 2025 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2026 break; 2027 2028 default: 2029 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n", 2030 host->host->host_no, acornscsi_target(host), ssr); 2031 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2032 acornscsi_abortcmd(host, host->SCpnt->tag); 2033 } 2034 return INTR_PROCESSING; 2035 2036 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */ 2037 /* 2038 * SCSI standard says that MESSAGE OUT phases can be followed by a 2039 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase 2040 */ 2041 switch (ssr) { 2042 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2043 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2044 /* MESSAGE OUT -> COMMAND */ 2045 acornscsi_sendcommand(host); 2046 break; 2047 2048 case 0x8b: /* -> PHASE_STATUS */ 2049 case 0x1b: /* -> PHASE_STATUS */ 2050 /* MESSAGE OUT -> STATUS */ 2051 acornscsi_readstatusbyte(host); 2052 host->scsi.phase = PHASE_STATUSIN; 2053 break; 2054 2055 case 0x8e: /* -> PHASE_MSGOUT */ 2056 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ 2057 acornscsi_sendmessage(host); 2058 break; 2059 2060 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2061 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2062 /* MESSAGE OUT -> MESSAGE IN */ 2063 acornscsi_message(host); 2064 break; 2065 2066 default: 2067 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n", 2068 host->host->host_no, acornscsi_target(host), ssr); 2069 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2070 } 2071 return INTR_PROCESSING; 2072 2073 case PHASE_COMMAND: /* STATE: connected & command sent */ 2074 switch (ssr) { 2075 case 0x18: /* -> PHASE_DATAOUT */ 2076 /* COMMAND -> DATA OUT */ 2077 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2078 acornscsi_abortcmd(host, host->SCpnt->tag); 2079 acornscsi_dma_setup(host, DMA_OUT); 2080 if (!acornscsi_starttransfer(host)) 2081 acornscsi_abortcmd(host, host->SCpnt->tag); 2082 host->scsi.phase = PHASE_DATAOUT; 2083 return INTR_IDLE; 2084 2085 case 0x19: /* -> PHASE_DATAIN */ 2086 /* COMMAND -> DATA IN */ 2087 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2088 acornscsi_abortcmd(host, host->SCpnt->tag); 2089 acornscsi_dma_setup(host, DMA_IN); 2090 if (!acornscsi_starttransfer(host)) 2091 acornscsi_abortcmd(host, host->SCpnt->tag); 2092 host->scsi.phase = PHASE_DATAIN; 2093 return INTR_IDLE; 2094 2095 case 0x1b: /* -> PHASE_STATUS */ 2096 /* COMMAND -> STATUS */ 2097 acornscsi_readstatusbyte(host); 2098 host->scsi.phase = PHASE_STATUSIN; 2099 break; 2100 2101 case 0x1e: /* -> PHASE_MSGOUT */ 2102 /* COMMAND -> MESSAGE OUT */ 2103 acornscsi_sendmessage(host); 2104 break; 2105 2106 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2107 /* COMMAND -> MESSAGE IN */ 2108 acornscsi_message(host); 2109 break; 2110 2111 default: 2112 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n", 2113 host->host->host_no, acornscsi_target(host), ssr); 2114 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2115 } 2116 return INTR_PROCESSING; 2117 2118 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ 2119 if (ssr == 0x85) { /* -> PHASE_IDLE */ 2120 host->scsi.disconnectable = 1; 2121 host->scsi.reconnected.tag = 0; 2122 host->scsi.phase = PHASE_IDLE; 2123 host->stats.disconnects += 1; 2124 } else { 2125 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n", 2126 host->host->host_no, acornscsi_target(host), ssr); 2127 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2128 } 2129 return INTR_NEXT_COMMAND; 2130 2131 case PHASE_IDLE: /* STATE: disconnected */ 2132 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 2133 acornscsi_reconnect(host); 2134 else { 2135 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n", 2136 host->host->host_no, acornscsi_target(host), ssr); 2137 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2138 } 2139 return INTR_PROCESSING; 2140 2141 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */ 2142 /* 2143 * Command reconnected - if MESGIN, get message - it may be 2144 * the tag. If not, get command out of disconnected queue 2145 */ 2146 /* 2147 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY, 2148 * reconnect I_T_L command 2149 */ 2150 if (ssr != 0x8f && !acornscsi_reconnect_finish(host)) 2151 return INTR_IDLE; 2152 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 2153 switch (ssr) { 2154 case 0x88: /* data out phase */ 2155 /* -> PHASE_DATAOUT */ 2156 /* MESSAGE IN -> DATA OUT */ 2157 acornscsi_dma_setup(host, DMA_OUT); 2158 if (!acornscsi_starttransfer(host)) 2159 acornscsi_abortcmd(host, host->SCpnt->tag); 2160 host->scsi.phase = PHASE_DATAOUT; 2161 return INTR_IDLE; 2162 2163 case 0x89: /* data in phase */ 2164 /* -> PHASE_DATAIN */ 2165 /* MESSAGE IN -> DATA IN */ 2166 acornscsi_dma_setup(host, DMA_IN); 2167 if (!acornscsi_starttransfer(host)) 2168 acornscsi_abortcmd(host, host->SCpnt->tag); 2169 host->scsi.phase = PHASE_DATAIN; 2170 return INTR_IDLE; 2171 2172 case 0x8a: /* command out */ 2173 /* MESSAGE IN -> COMMAND */ 2174 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2175 break; 2176 2177 case 0x8b: /* status in */ 2178 /* -> PHASE_STATUSIN */ 2179 /* MESSAGE IN -> STATUS */ 2180 acornscsi_readstatusbyte(host); 2181 host->scsi.phase = PHASE_STATUSIN; 2182 break; 2183 2184 case 0x8e: /* message out */ 2185 /* -> PHASE_MSGOUT */ 2186 /* MESSAGE IN -> MESSAGE OUT */ 2187 acornscsi_sendmessage(host); 2188 break; 2189 2190 case 0x8f: /* message in */ 2191 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2192 break; 2193 2194 default: 2195 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n", 2196 host->host->host_no, acornscsi_target(host), ssr); 2197 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2198 } 2199 return INTR_PROCESSING; 2200 2201 case PHASE_DATAIN: /* STATE: transferred data in */ 2202 /* 2203 * This is simple - if we disconnect then the DMA address & count is 2204 * correct. 2205 */ 2206 switch (ssr) { 2207 case 0x19: /* -> PHASE_DATAIN */ 2208 case 0x89: /* -> PHASE_DATAIN */ 2209 acornscsi_abortcmd(host, host->SCpnt->tag); 2210 return INTR_IDLE; 2211 2212 case 0x1b: /* -> PHASE_STATUSIN */ 2213 case 0x4b: /* -> PHASE_STATUSIN */ 2214 case 0x8b: /* -> PHASE_STATUSIN */ 2215 /* DATA IN -> STATUS */ 2216 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2217 acornscsi_sbic_xfcount(host); 2218 acornscsi_dma_stop(host); 2219 acornscsi_readstatusbyte(host); 2220 host->scsi.phase = PHASE_STATUSIN; 2221 break; 2222 2223 case 0x1e: /* -> PHASE_MSGOUT */ 2224 case 0x4e: /* -> PHASE_MSGOUT */ 2225 case 0x8e: /* -> PHASE_MSGOUT */ 2226 /* DATA IN -> MESSAGE OUT */ 2227 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2228 acornscsi_sbic_xfcount(host); 2229 acornscsi_dma_stop(host); 2230 acornscsi_sendmessage(host); 2231 break; 2232 2233 case 0x1f: /* message in */ 2234 case 0x4f: /* message in */ 2235 case 0x8f: /* message in */ 2236 /* DATA IN -> MESSAGE IN */ 2237 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2238 acornscsi_sbic_xfcount(host); 2239 acornscsi_dma_stop(host); 2240 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2241 break; 2242 2243 default: 2244 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n", 2245 host->host->host_no, acornscsi_target(host), ssr); 2246 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2247 } 2248 return INTR_PROCESSING; 2249 2250 case PHASE_DATAOUT: /* STATE: transferred data out */ 2251 /* 2252 * This is more complicated - if we disconnect, the DMA could be 12 2253 * bytes ahead of us. We need to correct this. 2254 */ 2255 switch (ssr) { 2256 case 0x18: /* -> PHASE_DATAOUT */ 2257 case 0x88: /* -> PHASE_DATAOUT */ 2258 acornscsi_abortcmd(host, host->SCpnt->tag); 2259 return INTR_IDLE; 2260 2261 case 0x1b: /* -> PHASE_STATUSIN */ 2262 case 0x4b: /* -> PHASE_STATUSIN */ 2263 case 0x8b: /* -> PHASE_STATUSIN */ 2264 /* DATA OUT -> STATUS */ 2265 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2266 acornscsi_sbic_xfcount(host); 2267 acornscsi_dma_stop(host); 2268 acornscsi_dma_adjust(host); 2269 acornscsi_readstatusbyte(host); 2270 host->scsi.phase = PHASE_STATUSIN; 2271 break; 2272 2273 case 0x1e: /* -> PHASE_MSGOUT */ 2274 case 0x4e: /* -> PHASE_MSGOUT */ 2275 case 0x8e: /* -> PHASE_MSGOUT */ 2276 /* DATA OUT -> MESSAGE OUT */ 2277 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2278 acornscsi_sbic_xfcount(host); 2279 acornscsi_dma_stop(host); 2280 acornscsi_dma_adjust(host); 2281 acornscsi_sendmessage(host); 2282 break; 2283 2284 case 0x1f: /* message in */ 2285 case 0x4f: /* message in */ 2286 case 0x8f: /* message in */ 2287 /* DATA OUT -> MESSAGE IN */ 2288 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2289 acornscsi_sbic_xfcount(host); 2290 acornscsi_dma_stop(host); 2291 acornscsi_dma_adjust(host); 2292 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2293 break; 2294 2295 default: 2296 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n", 2297 host->host->host_no, acornscsi_target(host), ssr); 2298 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2299 } 2300 return INTR_PROCESSING; 2301 2302 case PHASE_STATUSIN: /* STATE: status in complete */ 2303 switch (ssr) { 2304 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2305 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2306 /* STATUS -> MESSAGE IN */ 2307 acornscsi_message(host); 2308 break; 2309 2310 case 0x1e: /* -> PHASE_MSGOUT */ 2311 case 0x8e: /* -> PHASE_MSGOUT */ 2312 /* STATUS -> MESSAGE OUT */ 2313 acornscsi_sendmessage(host); 2314 break; 2315 2316 default: 2317 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n", 2318 host->host->host_no, acornscsi_target(host), ssr); 2319 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2320 } 2321 return INTR_PROCESSING; 2322 2323 case PHASE_MSGIN: /* STATE: message in */ 2324 switch (ssr) { 2325 case 0x1e: /* -> PHASE_MSGOUT */ 2326 case 0x4e: /* -> PHASE_MSGOUT */ 2327 case 0x8e: /* -> PHASE_MSGOUT */ 2328 /* MESSAGE IN -> MESSAGE OUT */ 2329 acornscsi_sendmessage(host); 2330 break; 2331 2332 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2333 case 0x2f: 2334 case 0x4f: 2335 case 0x8f: 2336 acornscsi_message(host); 2337 break; 2338 2339 case 0x85: 2340 printk("scsi%d.%c: strange message in disconnection\n", 2341 host->host->host_no, acornscsi_target(host)); 2342 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2343 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2344 break; 2345 2346 default: 2347 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n", 2348 host->host->host_no, acornscsi_target(host), ssr); 2349 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2350 } 2351 return INTR_PROCESSING; 2352 2353 case PHASE_DONE: /* STATE: received status & message */ 2354 switch (ssr) { 2355 case 0x85: /* -> PHASE_IDLE */ 2356 acornscsi_done(host, &host->SCpnt, DID_OK); 2357 return INTR_NEXT_COMMAND; 2358 2359 case 0x1e: 2360 case 0x8e: 2361 acornscsi_sendmessage(host); 2362 break; 2363 2364 default: 2365 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n", 2366 host->host->host_no, acornscsi_target(host), ssr); 2367 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2368 } 2369 return INTR_PROCESSING; 2370 2371 case PHASE_ABORTED: 2372 switch (ssr) { 2373 case 0x85: 2374 if (host->SCpnt) 2375 acornscsi_done(host, &host->SCpnt, DID_ABORT); 2376 else { 2377 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun, 2378 host->busyluns); 2379 host->scsi.phase = PHASE_IDLE; 2380 } 2381 return INTR_NEXT_COMMAND; 2382 2383 case 0x1e: 2384 case 0x2e: 2385 case 0x4e: 2386 case 0x8e: 2387 acornscsi_sendmessage(host); 2388 break; 2389 2390 default: 2391 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n", 2392 host->host->host_no, acornscsi_target(host), ssr); 2393 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2394 } 2395 return INTR_PROCESSING; 2396 2397 default: 2398 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n", 2399 host->host->host_no, acornscsi_target(host), ssr); 2400 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2401 } 2402 return INTR_PROCESSING; 2403 } 2404 2405 /* 2406 * Prototype: void acornscsi_intr(int irq, void *dev_id) 2407 * Purpose : handle interrupts from Acorn SCSI card 2408 * Params : irq - interrupt number 2409 * dev_id - device specific data (AS_Host structure) 2410 */ 2411 static irqreturn_t 2412 acornscsi_intr(int irq, void *dev_id) 2413 { 2414 AS_Host *host = (AS_Host *)dev_id; 2415 intr_ret_t ret; 2416 int iostatus; 2417 int in_irq = 0; 2418 2419 do { 2420 ret = INTR_IDLE; 2421 2422 iostatus = readb(host->fast + INT_REG); 2423 2424 if (iostatus & 2) { 2425 acornscsi_dma_intr(host); 2426 iostatus = readb(host->fast + INT_REG); 2427 } 2428 2429 if (iostatus & 8) 2430 ret = acornscsi_sbicintr(host, in_irq); 2431 2432 /* 2433 * If we have a transfer pending, start it. 2434 * Only start it if the interface has already started transferring 2435 * it's data 2436 */ 2437 if (host->dma.xfer_required) 2438 acornscsi_dma_xfer(host); 2439 2440 if (ret == INTR_NEXT_COMMAND) 2441 ret = acornscsi_kick(host); 2442 2443 in_irq = 1; 2444 } while (ret != INTR_IDLE); 2445 2446 return IRQ_HANDLED; 2447 } 2448 2449 /*============================================================================================= 2450 * Interfaces between interrupt handler and rest of scsi code 2451 */ 2452 2453 /* 2454 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2455 * Purpose : queues a SCSI command 2456 * Params : cmd - SCSI command 2457 * done - function called on completion, with pointer to command descriptor 2458 * Returns : 0, or < 0 on error. 2459 */ 2460 static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt, 2461 void (*done)(struct scsi_cmnd *)) 2462 { 2463 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2464 2465 if (!done) { 2466 /* there should be some way of rejecting errors like this without panicing... */ 2467 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]", 2468 host->host->host_no, SCpnt); 2469 return -EINVAL; 2470 } 2471 2472 #if (DEBUG & DEBUG_NO_WRITE) 2473 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) { 2474 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n", 2475 host->host->host_no, '0' + SCpnt->device->id); 2476 set_host_byte(SCpnt, DID_NO_CONNECT); 2477 done(SCpnt); 2478 return 0; 2479 } 2480 #endif 2481 2482 SCpnt->scsi_done = done; 2483 SCpnt->host_scribble = NULL; 2484 SCpnt->result = 0; 2485 SCpnt->tag = 0; 2486 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); 2487 SCpnt->SCp.sent_command = 0; 2488 SCpnt->SCp.scsi_xferred = 0; 2489 2490 init_SCp(SCpnt); 2491 2492 host->stats.queues += 1; 2493 2494 { 2495 unsigned long flags; 2496 2497 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { 2498 set_host_byte(SCpnt, DID_ERROR); 2499 done(SCpnt); 2500 return 0; 2501 } 2502 local_irq_save(flags); 2503 if (host->scsi.phase == PHASE_IDLE) 2504 acornscsi_kick(host); 2505 local_irq_restore(flags); 2506 } 2507 return 0; 2508 } 2509 2510 DEF_SCSI_QCMD(acornscsi_queuecmd) 2511 2512 enum res_abort { res_not_running, res_success, res_success_clear, res_snooze }; 2513 2514 /* 2515 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt) 2516 * Purpose : abort a command on this host 2517 * Params : SCpnt - command to abort 2518 * Returns : our abort status 2519 */ 2520 static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt) 2521 { 2522 enum res_abort res = res_not_running; 2523 2524 if (queue_remove_cmd(&host->queues.issue, SCpnt)) { 2525 /* 2526 * The command was on the issue queue, and has not been 2527 * issued yet. We can remove the command from the queue, 2528 * and acknowledge the abort. Neither the devices nor the 2529 * interface know about the command. 2530 */ 2531 //#if (DEBUG & DEBUG_ABORT) 2532 printk("on issue queue "); 2533 //#endif 2534 res = res_success; 2535 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) { 2536 /* 2537 * The command was on the disconnected queue. Simply 2538 * acknowledge the abort condition, and when the target 2539 * reconnects, we will give it an ABORT message. The 2540 * target should then disconnect, and we will clear 2541 * the busylun bit. 2542 */ 2543 //#if (DEBUG & DEBUG_ABORT) 2544 printk("on disconnected queue "); 2545 //#endif 2546 res = res_success; 2547 } else if (host->SCpnt == SCpnt) { 2548 unsigned long flags; 2549 2550 //#if (DEBUG & DEBUG_ABORT) 2551 printk("executing "); 2552 //#endif 2553 2554 local_irq_save(flags); 2555 switch (host->scsi.phase) { 2556 /* 2557 * If the interface is idle, and the command is 'disconnectable', 2558 * then it is the same as on the disconnected queue. We simply 2559 * remove all traces of the command. When the target reconnects, 2560 * we will give it an ABORT message since the command could not 2561 * be found. When the target finally disconnects, we will clear 2562 * the busylun bit. 2563 */ 2564 case PHASE_IDLE: 2565 if (host->scsi.disconnectable) { 2566 host->scsi.disconnectable = 0; 2567 host->SCpnt = NULL; 2568 res = res_success; 2569 } 2570 break; 2571 2572 /* 2573 * If the command has connected and done nothing further, 2574 * simply force a disconnect. We also need to clear the 2575 * busylun bit. 2576 */ 2577 case PHASE_CONNECTED: 2578 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT); 2579 host->SCpnt = NULL; 2580 res = res_success_clear; 2581 break; 2582 2583 default: 2584 acornscsi_abortcmd(host, host->SCpnt->tag); 2585 res = res_snooze; 2586 } 2587 local_irq_restore(flags); 2588 } else if (host->origSCpnt == SCpnt) { 2589 /* 2590 * The command will be executed next, but a command 2591 * is currently using the interface. This is similar to 2592 * being on the issue queue, except the busylun bit has 2593 * been set. 2594 */ 2595 host->origSCpnt = NULL; 2596 //#if (DEBUG & DEBUG_ABORT) 2597 printk("waiting for execution "); 2598 //#endif 2599 res = res_success_clear; 2600 } else 2601 printk("unknown "); 2602 2603 return res; 2604 } 2605 2606 /* 2607 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt) 2608 * Purpose : abort a command on this host 2609 * Params : SCpnt - command to abort 2610 * Returns : one of SCSI_ABORT_ macros 2611 */ 2612 int acornscsi_abort(struct scsi_cmnd *SCpnt) 2613 { 2614 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata; 2615 int result; 2616 2617 host->stats.aborts += 1; 2618 2619 #if (DEBUG & DEBUG_ABORT) 2620 { 2621 int asr, ssr; 2622 asr = sbic_arm_read(host, SBIC_ASR); 2623 ssr = sbic_arm_read(host, SBIC_SSR); 2624 2625 printk(KERN_WARNING "acornscsi_abort: "); 2626 print_sbic_status(asr, ssr, host->scsi.phase); 2627 acornscsi_dumplog(host, SCpnt->device->id); 2628 } 2629 #endif 2630 2631 printk("scsi%d: ", host->host->host_no); 2632 2633 switch (acornscsi_do_abort(host, SCpnt)) { 2634 /* 2635 * We managed to find the command and cleared it out. 2636 * We do not expect the command to be executing on the 2637 * target, but we have set the busylun bit. 2638 */ 2639 case res_success_clear: 2640 //#if (DEBUG & DEBUG_ABORT) 2641 printk("clear "); 2642 //#endif 2643 clear_bit(SCpnt->device->id * 8 + 2644 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 2645 2646 /* 2647 * We found the command, and cleared it out. Either 2648 * the command is still known to be executing on the 2649 * target, or the busylun bit is not set. 2650 */ 2651 case res_success: 2652 //#if (DEBUG & DEBUG_ABORT) 2653 printk("success\n"); 2654 //#endif 2655 result = SUCCESS; 2656 break; 2657 2658 /* 2659 * We did find the command, but unfortunately we couldn't 2660 * unhook it from ourselves. Wait some more, and if it 2661 * still doesn't complete, reset the interface. 2662 */ 2663 case res_snooze: 2664 //#if (DEBUG & DEBUG_ABORT) 2665 printk("snooze\n"); 2666 //#endif 2667 result = FAILED; 2668 break; 2669 2670 /* 2671 * The command could not be found (either because it completed, 2672 * or it got dropped. 2673 */ 2674 default: 2675 case res_not_running: 2676 acornscsi_dumplog(host, SCpnt->device->id); 2677 result = FAILED; 2678 //#if (DEBUG & DEBUG_ABORT) 2679 printk("not running\n"); 2680 //#endif 2681 break; 2682 } 2683 2684 return result; 2685 } 2686 2687 /* 2688 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt) 2689 * Purpose : reset a command on this host/reset this host 2690 * Params : SCpnt - command causing reset 2691 * Returns : one of SCSI_RESET_ macros 2692 */ 2693 int acornscsi_host_reset(struct scsi_cmnd *SCpnt) 2694 { 2695 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2696 struct scsi_cmnd *SCptr; 2697 2698 host->stats.resets += 1; 2699 2700 #if (DEBUG & DEBUG_RESET) 2701 { 2702 int asr, ssr, devidx; 2703 2704 asr = sbic_arm_read(host, SBIC_ASR); 2705 ssr = sbic_arm_read(host, SBIC_SSR); 2706 2707 printk(KERN_WARNING "acornscsi_reset: "); 2708 print_sbic_status(asr, ssr, host->scsi.phase); 2709 for (devidx = 0; devidx < 9; devidx++) 2710 acornscsi_dumplog(host, devidx); 2711 } 2712 #endif 2713 2714 acornscsi_dma_stop(host); 2715 2716 /* 2717 * do hard reset. This resets all devices on this host, and so we 2718 * must set the reset status on all commands. 2719 */ 2720 acornscsi_resetcard(host); 2721 2722 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL) 2723 ; 2724 2725 return SUCCESS; 2726 } 2727 2728 /*============================================================================================== 2729 * initialisation & miscellaneous support 2730 */ 2731 2732 /* 2733 * Function: char *acornscsi_info(struct Scsi_Host *host) 2734 * Purpose : return a string describing this interface 2735 * Params : host - host to give information on 2736 * Returns : a constant string 2737 */ 2738 const 2739 char *acornscsi_info(struct Scsi_Host *host) 2740 { 2741 static char string[100], *p; 2742 2743 p = string; 2744 2745 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d" 2746 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2747 " SYNC" 2748 #endif 2749 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2750 " TAG" 2751 #endif 2752 #if (DEBUG & DEBUG_NO_WRITE) 2753 " NOWRITE (" __stringify(NO_WRITE) ")" 2754 #endif 2755 , host->hostt->name, host->io_port, host->irq, 2756 VER_MAJOR, VER_MINOR, VER_PATCH); 2757 return string; 2758 } 2759 2760 static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance) 2761 { 2762 int devidx; 2763 struct scsi_device *scd; 2764 AS_Host *host; 2765 2766 host = (AS_Host *)instance->hostdata; 2767 2768 seq_printf(m, "AcornSCSI driver v%d.%d.%d" 2769 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2770 " SYNC" 2771 #endif 2772 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2773 " TAG" 2774 #endif 2775 #if (DEBUG & DEBUG_NO_WRITE) 2776 " NOWRITE (" __stringify(NO_WRITE) ")" 2777 #endif 2778 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); 2779 2780 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n", 2781 host->base + SBIC_REGIDX, host->scsi.irq); 2782 #ifdef USE_DMAC 2783 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", 2784 host->base + DMAC_OFFSET, host->scsi.irq); 2785 #endif 2786 2787 seq_printf(m, "Statistics:\n" 2788 "Queued commands: %-10u Issued commands: %-10u\n" 2789 "Done commands : %-10u Reads : %-10u\n" 2790 "Writes : %-10u Others : %-10u\n" 2791 "Disconnects : %-10u Aborts : %-10u\n" 2792 "Resets : %-10u\n\nLast phases:", 2793 host->stats.queues, host->stats.removes, 2794 host->stats.fins, host->stats.reads, 2795 host->stats.writes, host->stats.miscs, 2796 host->stats.disconnects, host->stats.aborts, 2797 host->stats.resets); 2798 2799 for (devidx = 0; devidx < 9; devidx ++) { 2800 unsigned int statptr, prev; 2801 2802 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx)); 2803 statptr = host->status_ptr[devidx] - 10; 2804 2805 if ((signed int)statptr < 0) 2806 statptr += STATUS_BUFFER_SIZE; 2807 2808 prev = host->status[devidx][statptr].when; 2809 2810 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 2811 if (host->status[devidx][statptr].when) { 2812 seq_printf(m, "%c%02X:%02X+%2ld", 2813 host->status[devidx][statptr].irq ? '-' : ' ', 2814 host->status[devidx][statptr].ph, 2815 host->status[devidx][statptr].ssr, 2816 (host->status[devidx][statptr].when - prev) < 100 ? 2817 (host->status[devidx][statptr].when - prev) : 99); 2818 prev = host->status[devidx][statptr].when; 2819 } 2820 } 2821 } 2822 2823 seq_printf(m, "\nAttached devices:\n"); 2824 2825 shost_for_each_device(scd, instance) { 2826 seq_printf(m, "Device/Lun TaggedQ Sync\n"); 2827 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 2828 if (scd->tagged_supported) 2829 seq_printf(m, "%3sabled(%3d) ", 2830 scd->simple_tags ? "en" : "dis", 2831 scd->current_tag); 2832 else 2833 seq_printf(m, "unsupported "); 2834 2835 if (host->device[scd->id].sync_xfer & 15) 2836 seq_printf(m, "offset %d, %d ns\n", 2837 host->device[scd->id].sync_xfer & 15, 2838 acornscsi_getperiod(host->device[scd->id].sync_xfer)); 2839 else 2840 seq_printf(m, "async\n"); 2841 2842 } 2843 return 0; 2844 } 2845 2846 static struct scsi_host_template acornscsi_template = { 2847 .module = THIS_MODULE, 2848 .show_info = acornscsi_show_info, 2849 .name = "AcornSCSI", 2850 .info = acornscsi_info, 2851 .queuecommand = acornscsi_queuecmd, 2852 .eh_abort_handler = acornscsi_abort, 2853 .eh_host_reset_handler = acornscsi_host_reset, 2854 .can_queue = 16, 2855 .this_id = 7, 2856 .sg_tablesize = SG_ALL, 2857 .cmd_per_lun = 2, 2858 .dma_boundary = PAGE_SIZE - 1, 2859 .proc_name = "acornscsi", 2860 }; 2861 2862 static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id) 2863 { 2864 struct Scsi_Host *host; 2865 AS_Host *ashost; 2866 int ret; 2867 2868 ret = ecard_request_resources(ec); 2869 if (ret) 2870 goto out; 2871 2872 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host)); 2873 if (!host) { 2874 ret = -ENOMEM; 2875 goto out_release; 2876 } 2877 2878 ashost = (AS_Host *)host->hostdata; 2879 2880 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 2881 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 2882 if (!ashost->base || !ashost->fast) { 2883 ret = -ENOMEM; 2884 goto out_put; 2885 } 2886 2887 host->irq = ec->irq; 2888 ashost->host = host; 2889 ashost->scsi.irq = host->irq; 2890 2891 ec->irqaddr = ashost->fast + INT_REG; 2892 ec->irqmask = 0x0a; 2893 2894 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost); 2895 if (ret) { 2896 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n", 2897 host->host_no, ashost->scsi.irq, ret); 2898 goto out_put; 2899 } 2900 2901 memset(&ashost->stats, 0, sizeof (ashost->stats)); 2902 queue_initialise(&ashost->queues.issue); 2903 queue_initialise(&ashost->queues.disconnected); 2904 msgqueue_initialise(&ashost->scsi.msgs); 2905 2906 acornscsi_resetcard(ashost); 2907 2908 ret = scsi_add_host(host, &ec->dev); 2909 if (ret) 2910 goto out_irq; 2911 2912 scsi_scan_host(host); 2913 goto out; 2914 2915 out_irq: 2916 free_irq(host->irq, ashost); 2917 msgqueue_free(&ashost->scsi.msgs); 2918 queue_free(&ashost->queues.disconnected); 2919 queue_free(&ashost->queues.issue); 2920 out_put: 2921 ecardm_iounmap(ec, ashost->fast); 2922 ecardm_iounmap(ec, ashost->base); 2923 scsi_host_put(host); 2924 out_release: 2925 ecard_release_resources(ec); 2926 out: 2927 return ret; 2928 } 2929 2930 static void acornscsi_remove(struct expansion_card *ec) 2931 { 2932 struct Scsi_Host *host = ecard_get_drvdata(ec); 2933 AS_Host *ashost = (AS_Host *)host->hostdata; 2934 2935 ecard_set_drvdata(ec, NULL); 2936 scsi_remove_host(host); 2937 2938 /* 2939 * Put card into RESET state 2940 */ 2941 writeb(0x80, ashost->fast + PAGE_REG); 2942 2943 free_irq(host->irq, ashost); 2944 2945 msgqueue_free(&ashost->scsi.msgs); 2946 queue_free(&ashost->queues.disconnected); 2947 queue_free(&ashost->queues.issue); 2948 ecardm_iounmap(ec, ashost->fast); 2949 ecardm_iounmap(ec, ashost->base); 2950 scsi_host_put(host); 2951 ecard_release_resources(ec); 2952 } 2953 2954 static const struct ecard_id acornscsi_cids[] = { 2955 { MANU_ACORN, PROD_ACORN_SCSI }, 2956 { 0xffff, 0xffff }, 2957 }; 2958 2959 static struct ecard_driver acornscsi_driver = { 2960 .probe = acornscsi_probe, 2961 .remove = acornscsi_remove, 2962 .id_table = acornscsi_cids, 2963 .drv = { 2964 .name = "acornscsi", 2965 }, 2966 }; 2967 2968 static int __init acornscsi_init(void) 2969 { 2970 return ecard_register_driver(&acornscsi_driver); 2971 } 2972 2973 static void __exit acornscsi_exit(void) 2974 { 2975 ecard_remove_driver(&acornscsi_driver); 2976 } 2977 2978 module_init(acornscsi_init); 2979 module_exit(acornscsi_exit); 2980 2981 MODULE_AUTHOR("Russell King"); 2982 MODULE_DESCRIPTION("AcornSCSI driver"); 2983 MODULE_LICENSE("GPL"); 2984