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