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 if (!SCpnt->scsi_done) 845 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); 846 847 clear_bit(SCpnt->device->id * 8 + 848 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 849 850 SCpnt->scsi_done(SCpnt); 851 } else 852 printk("scsi%d: null command in acornscsi_done", host->host->host_no); 853 854 host->scsi.phase = PHASE_IDLE; 855 } 856 857 /* ==================================================================================== 858 * DMA routines 859 */ 860 /* 861 * Purpose : update SCSI Data Pointer 862 * Notes : this will only be one SG entry or less 863 */ 864 static 865 void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) 866 { 867 SCp->ptr += length; 868 SCp->this_residual -= length; 869 870 if (SCp->this_residual == 0 && next_SCp(SCp) == 0) 871 host->dma.xfer_done = 1; 872 } 873 874 /* 875 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, 876 * unsigned int start_addr, unsigned int length) 877 * Purpose : read data from DMA RAM 878 * Params : host - host to transfer from 879 * ptr - DRAM address 880 * start_addr - host mem address 881 * length - number of bytes to transfer 882 * Notes : this will only be one SG entry or less 883 */ 884 static 885 void acornscsi_data_read(AS_Host *host, char *ptr, 886 unsigned int start_addr, unsigned int length) 887 { 888 extern void __acornscsi_in(void __iomem *, char *buf, int len); 889 unsigned int page, offset, len = length; 890 891 page = (start_addr >> 12); 892 offset = start_addr & ((1 << 12) - 1); 893 894 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 895 896 while (len > 0) { 897 unsigned int this_len; 898 899 if (len + offset > (1 << 12)) 900 this_len = (1 << 12) - offset; 901 else 902 this_len = len; 903 904 __acornscsi_in(host->base + (offset << 1), ptr, this_len); 905 906 offset += this_len; 907 ptr += this_len; 908 len -= this_len; 909 910 if (offset == (1 << 12)) { 911 offset = 0; 912 page ++; 913 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 914 } 915 } 916 writeb(host->card.page_reg, host->fast + PAGE_REG); 917 } 918 919 /* 920 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, 921 * unsigned int start_addr, unsigned int length) 922 * Purpose : write data to DMA RAM 923 * Params : host - host to transfer from 924 * ptr - DRAM address 925 * start_addr - host mem address 926 * length - number of bytes to transfer 927 * Notes : this will only be one SG entry or less 928 */ 929 static 930 void acornscsi_data_write(AS_Host *host, char *ptr, 931 unsigned int start_addr, unsigned int length) 932 { 933 extern void __acornscsi_out(void __iomem *, char *buf, int len); 934 unsigned int page, offset, len = length; 935 936 page = (start_addr >> 12); 937 offset = start_addr & ((1 << 12) - 1); 938 939 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 940 941 while (len > 0) { 942 unsigned int this_len; 943 944 if (len + offset > (1 << 12)) 945 this_len = (1 << 12) - offset; 946 else 947 this_len = len; 948 949 __acornscsi_out(host->base + (offset << 1), ptr, this_len); 950 951 offset += this_len; 952 ptr += this_len; 953 len -= this_len; 954 955 if (offset == (1 << 12)) { 956 offset = 0; 957 page ++; 958 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 959 } 960 } 961 writeb(host->card.page_reg, host->fast + PAGE_REG); 962 } 963 964 /* ========================================================================================= 965 * On-board DMA routines 966 */ 967 #ifdef USE_DMAC 968 /* 969 * Prototype: void acornscsi_dmastop(AS_Host *host) 970 * Purpose : stop all DMA 971 * Params : host - host on which to stop DMA 972 * Notes : This is called when leaving DATA IN/OUT phase, 973 * or when interface is RESET 974 */ 975 static inline 976 void acornscsi_dma_stop(AS_Host *host) 977 { 978 dmac_write(host, DMAC_MASKREG, MASK_ON); 979 dmac_clearintr(host); 980 981 #if (DEBUG & DEBUG_DMA) 982 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); 983 #endif 984 } 985 986 /* 987 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 988 * Purpose : setup DMA controller for data transfer 989 * Params : host - host to setup 990 * direction - data transfer direction 991 * Notes : This is called when entering DATA I/O phase, not 992 * while we're in a DATA I/O phase 993 */ 994 static 995 void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 996 { 997 unsigned int address, length, mode; 998 999 host->dma.direction = direction; 1000 1001 dmac_write(host, DMAC_MASKREG, MASK_ON); 1002 1003 if (direction == DMA_OUT) { 1004 #if (DEBUG & DEBUG_NO_WRITE) 1005 if (NO_WRITE & (1 << host->SCpnt->device->id)) { 1006 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", 1007 host->host->host_no, acornscsi_target(host)); 1008 return; 1009 } 1010 #endif 1011 mode = DMAC_WRITE; 1012 } else 1013 mode = DMAC_READ; 1014 1015 /* 1016 * Allocate some buffer space, limited to half the buffer size 1017 */ 1018 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1019 if (length) { 1020 host->dma.start_addr = address = host->dma.free_addr; 1021 host->dma.free_addr = (host->dma.free_addr + length) & 1022 (DMAC_BUFFER_SIZE - 1); 1023 1024 /* 1025 * Transfer data to DMA memory 1026 */ 1027 if (direction == DMA_OUT) 1028 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1029 length); 1030 1031 length -= 1; 1032 dmac_write(host, DMAC_TXCNTLO, length); 1033 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1034 dmac_write(host, DMAC_TXADRLO, address); 1035 dmac_write(host, DMAC_TXADRMD, address >> 8); 1036 dmac_write(host, DMAC_TXADRHI, 0); 1037 dmac_write(host, DMAC_MODECON, mode); 1038 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1039 1040 #if (DEBUG & DEBUG_DMA) 1041 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); 1042 #endif 1043 host->dma.xfer_setup = 1; 1044 } 1045 } 1046 1047 /* 1048 * Function: void acornscsi_dma_cleanup(AS_Host *host) 1049 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct 1050 * Params : host - host to finish 1051 * Notes : This is called when a command is: 1052 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONNECT 1053 * : This must not return until all transfers are completed. 1054 */ 1055 static 1056 void acornscsi_dma_cleanup(AS_Host *host) 1057 { 1058 dmac_write(host, DMAC_MASKREG, MASK_ON); 1059 dmac_clearintr(host); 1060 1061 /* 1062 * Check for a pending transfer 1063 */ 1064 if (host->dma.xfer_required) { 1065 host->dma.xfer_required = 0; 1066 if (host->dma.direction == DMA_IN) 1067 acornscsi_data_read(host, host->dma.xfer_ptr, 1068 host->dma.xfer_start, host->dma.xfer_length); 1069 } 1070 1071 /* 1072 * Has a transfer been setup? 1073 */ 1074 if (host->dma.xfer_setup) { 1075 unsigned int transferred; 1076 1077 host->dma.xfer_setup = 0; 1078 1079 #if (DEBUG & DEBUG_DMA) 1080 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi")); 1081 #endif 1082 1083 /* 1084 * Calculate number of bytes transferred from DMA. 1085 */ 1086 transferred = dmac_address(host) - host->dma.start_addr; 1087 host->dma.transferred += transferred; 1088 1089 if (host->dma.direction == DMA_IN) 1090 acornscsi_data_read(host, host->scsi.SCp.ptr, 1091 host->dma.start_addr, transferred); 1092 1093 /* 1094 * Update SCSI pointers 1095 */ 1096 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1097 #if (DEBUG & DEBUG_DMA) 1098 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo")); 1099 #endif 1100 } 1101 } 1102 1103 /* 1104 * Function: void acornscsi_dmacintr(AS_Host *host) 1105 * Purpose : handle interrupts from DMAC device 1106 * Params : host - host to process 1107 * Notes : If reading, we schedule the read to main memory & 1108 * allow the transfer to continue. 1109 * : If writing, we fill the onboard DMA memory from main 1110 * memory. 1111 * : Called whenever DMAC finished it's current transfer. 1112 */ 1113 static 1114 void acornscsi_dma_intr(AS_Host *host) 1115 { 1116 unsigned int address, length, transferred; 1117 1118 #if (DEBUG & DEBUG_DMA) 1119 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti")); 1120 #endif 1121 1122 dmac_write(host, DMAC_MASKREG, MASK_ON); 1123 dmac_clearintr(host); 1124 1125 /* 1126 * Calculate amount transferred via DMA 1127 */ 1128 transferred = dmac_address(host) - host->dma.start_addr; 1129 host->dma.transferred += transferred; 1130 1131 /* 1132 * Schedule DMA transfer off board 1133 */ 1134 if (host->dma.direction == DMA_IN) { 1135 host->dma.xfer_start = host->dma.start_addr; 1136 host->dma.xfer_length = transferred; 1137 host->dma.xfer_ptr = host->scsi.SCp.ptr; 1138 host->dma.xfer_required = 1; 1139 } 1140 1141 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1142 1143 /* 1144 * Allocate some buffer space, limited to half the on-board RAM size 1145 */ 1146 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1147 if (length) { 1148 host->dma.start_addr = address = host->dma.free_addr; 1149 host->dma.free_addr = (host->dma.free_addr + length) & 1150 (DMAC_BUFFER_SIZE - 1); 1151 1152 /* 1153 * Transfer data to DMA memory 1154 */ 1155 if (host->dma.direction == DMA_OUT) 1156 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1157 length); 1158 1159 length -= 1; 1160 dmac_write(host, DMAC_TXCNTLO, length); 1161 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1162 dmac_write(host, DMAC_TXADRLO, address); 1163 dmac_write(host, DMAC_TXADRMD, address >> 8); 1164 dmac_write(host, DMAC_TXADRHI, 0); 1165 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1166 1167 #if (DEBUG & DEBUG_DMA) 1168 DBG(host->SCpnt, acornscsi_dumpdma(host, "into")); 1169 #endif 1170 } else { 1171 host->dma.xfer_setup = 0; 1172 #if 0 1173 /* 1174 * If the interface still wants more, then this is an error. 1175 * We give it another byte, but we also attempt to raise an 1176 * attention condition. We continue giving one byte until 1177 * the device recognises the attention. 1178 */ 1179 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) { 1180 acornscsi_abortcmd(host); 1181 1182 dmac_write(host, DMAC_TXCNTLO, 0); 1183 dmac_write(host, DMAC_TXCNTHI, 0); 1184 dmac_write(host, DMAC_TXADRLO, 0); 1185 dmac_write(host, DMAC_TXADRMD, 0); 1186 dmac_write(host, DMAC_TXADRHI, 0); 1187 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1188 } 1189 #endif 1190 } 1191 } 1192 1193 /* 1194 * Function: void acornscsi_dma_xfer(AS_Host *host) 1195 * Purpose : transfer data between AcornSCSI and memory 1196 * Params : host - host to process 1197 */ 1198 static 1199 void acornscsi_dma_xfer(AS_Host *host) 1200 { 1201 host->dma.xfer_required = 0; 1202 1203 if (host->dma.direction == DMA_IN) 1204 acornscsi_data_read(host, host->dma.xfer_ptr, 1205 host->dma.xfer_start, host->dma.xfer_length); 1206 } 1207 1208 /* 1209 * Function: void acornscsi_dma_adjust(AS_Host *host) 1210 * Purpose : adjust DMA pointers & count for bytes transferred to 1211 * SBIC but not SCSI bus. 1212 * Params : host - host to adjust DMA count for 1213 */ 1214 static 1215 void acornscsi_dma_adjust(AS_Host *host) 1216 { 1217 if (host->dma.xfer_setup) { 1218 signed long transferred; 1219 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1220 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); 1221 #endif 1222 /* 1223 * Calculate correct DMA address - DMA is ahead of SCSI bus while 1224 * writing. 1225 * host->scsi.SCp.scsi_xferred is the number of bytes 1226 * actually transferred to/from the SCSI bus. 1227 * host->dma.transferred is the number of bytes transferred 1228 * over DMA since host->dma.start_addr was last set. 1229 * 1230 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred 1231 * - host->dma.transferred 1232 */ 1233 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; 1234 if (transferred < 0) 1235 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", 1236 host->host->host_no, acornscsi_target(host), transferred); 1237 else if (transferred == 0) 1238 host->dma.xfer_setup = 0; 1239 else { 1240 transferred += host->dma.start_addr; 1241 dmac_write(host, DMAC_TXADRLO, transferred); 1242 dmac_write(host, DMAC_TXADRMD, transferred >> 8); 1243 dmac_write(host, DMAC_TXADRHI, transferred >> 16); 1244 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1245 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); 1246 #endif 1247 } 1248 } 1249 } 1250 #endif 1251 1252 /* ========================================================================================= 1253 * Data I/O 1254 */ 1255 static int 1256 acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) 1257 { 1258 unsigned int asr, timeout = max_timeout; 1259 int my_ptr = *ptr; 1260 1261 while (my_ptr < len) { 1262 asr = sbic_arm_read(host, SBIC_ASR); 1263 1264 if (asr & ASR_DBR) { 1265 timeout = max_timeout; 1266 1267 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); 1268 } else if (asr & ASR_INT) 1269 break; 1270 else if (--timeout == 0) 1271 break; 1272 udelay(1); 1273 } 1274 1275 *ptr = my_ptr; 1276 1277 return (timeout == 0) ? -1 : 0; 1278 } 1279 1280 /* 1281 * Function: void acornscsi_sendcommand(AS_Host *host) 1282 * Purpose : send a command to a target 1283 * Params : host - host which is connected to target 1284 */ 1285 static void 1286 acornscsi_sendcommand(AS_Host *host) 1287 { 1288 struct scsi_cmnd *SCpnt = host->SCpnt; 1289 1290 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1291 sbic_arm_writenext(host, 0); 1292 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); 1293 1294 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1295 1296 if (acornscsi_write_pio(host, SCpnt->cmnd, 1297 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) 1298 printk("scsi%d: timeout while sending command\n", host->host->host_no); 1299 1300 host->scsi.phase = PHASE_COMMAND; 1301 } 1302 1303 static 1304 void acornscsi_sendmessage(AS_Host *host) 1305 { 1306 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); 1307 unsigned int msgnr; 1308 struct message *msg; 1309 1310 #if (DEBUG & DEBUG_MESSAGES) 1311 printk("scsi%d.%c: sending message ", 1312 host->host->host_no, acornscsi_target(host)); 1313 #endif 1314 1315 switch (message_length) { 1316 case 0: 1317 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1318 1319 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); 1320 1321 sbic_arm_write(host, SBIC_DATA, NOP); 1322 1323 host->scsi.last_message = NOP; 1324 #if (DEBUG & DEBUG_MESSAGES) 1325 printk("NOP"); 1326 #endif 1327 break; 1328 1329 case 1: 1330 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1331 msg = msgqueue_getmsg(&host->scsi.msgs, 0); 1332 1333 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); 1334 1335 sbic_arm_write(host, SBIC_DATA, msg->msg[0]); 1336 1337 host->scsi.last_message = msg->msg[0]; 1338 #if (DEBUG & DEBUG_MESSAGES) 1339 spi_print_msg(msg->msg); 1340 #endif 1341 break; 1342 1343 default: 1344 /* 1345 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) 1346 * 'When a target sends this (MESSAGE_REJECT) message, it 1347 * shall change to MESSAGE IN phase and send this message 1348 * prior to requesting additional message bytes from the 1349 * initiator. This provides an interlock so that the 1350 * initiator can determine which message byte is rejected. 1351 */ 1352 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1353 sbic_arm_writenext(host, 0); 1354 sbic_arm_writenext(host, message_length); 1355 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1356 1357 msgnr = 0; 1358 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { 1359 unsigned int i; 1360 #if (DEBUG & DEBUG_MESSAGES) 1361 spi_print_msg(msg); 1362 #endif 1363 i = 0; 1364 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) 1365 printk("scsi%d: timeout while sending message\n", host->host->host_no); 1366 1367 host->scsi.last_message = msg->msg[0]; 1368 if (msg->msg[0] == EXTENDED_MESSAGE) 1369 host->scsi.last_message |= msg->msg[2] << 8; 1370 1371 if (i != msg->length) 1372 break; 1373 } 1374 break; 1375 } 1376 #if (DEBUG & DEBUG_MESSAGES) 1377 printk("\n"); 1378 #endif 1379 } 1380 1381 /* 1382 * Function: void acornscsi_readstatusbyte(AS_Host *host) 1383 * Purpose : Read status byte from connected target 1384 * Params : host - host connected to target 1385 */ 1386 static 1387 void acornscsi_readstatusbyte(AS_Host *host) 1388 { 1389 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); 1390 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); 1391 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); 1392 } 1393 1394 /* 1395 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) 1396 * Purpose : Read one message byte from connected target 1397 * Params : host - host connected to target 1398 */ 1399 static 1400 unsigned char acornscsi_readmessagebyte(AS_Host *host) 1401 { 1402 unsigned char message; 1403 1404 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1405 1406 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); 1407 1408 message = sbic_arm_read(host, SBIC_DATA); 1409 1410 /* wait for MSGIN-XFER-PAUSED */ 1411 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); 1412 1413 sbic_arm_read(host, SBIC_SSR); 1414 1415 return message; 1416 } 1417 1418 /* 1419 * Function: void acornscsi_message(AS_Host *host) 1420 * Purpose : Read complete message from connected target & action message 1421 * Params : host - host connected to target 1422 */ 1423 static 1424 void acornscsi_message(AS_Host *host) 1425 { 1426 unsigned char message[16]; 1427 unsigned int msgidx = 0, msglen = 1; 1428 1429 do { 1430 message[msgidx] = acornscsi_readmessagebyte(host); 1431 1432 switch (msgidx) { 1433 case 0: 1434 if (message[0] == EXTENDED_MESSAGE || 1435 (message[0] >= 0x20 && message[0] <= 0x2f)) 1436 msglen = 2; 1437 break; 1438 1439 case 1: 1440 if (message[0] == EXTENDED_MESSAGE) 1441 msglen += message[msgidx]; 1442 break; 1443 } 1444 msgidx += 1; 1445 if (msgidx < msglen) { 1446 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1447 1448 /* wait for next msg-in */ 1449 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); 1450 sbic_arm_read(host, SBIC_SSR); 1451 } 1452 } while (msgidx < msglen); 1453 1454 #if (DEBUG & DEBUG_MESSAGES) 1455 printk("scsi%d.%c: message in: ", 1456 host->host->host_no, acornscsi_target(host)); 1457 spi_print_msg(message); 1458 printk("\n"); 1459 #endif 1460 1461 if (host->scsi.phase == PHASE_RECONNECTED) { 1462 /* 1463 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1464 * 'Whenever a target reconnects to an initiator to continue 1465 * a tagged I/O process, the SIMPLE QUEUE TAG message shall 1466 * be sent immediately following the IDENTIFY message...' 1467 */ 1468 if (message[0] == SIMPLE_QUEUE_TAG) 1469 host->scsi.reconnected.tag = message[1]; 1470 if (acornscsi_reconnect_finish(host)) 1471 host->scsi.phase = PHASE_MSGIN; 1472 } 1473 1474 switch (message[0]) { 1475 case ABORT_TASK_SET: 1476 case ABORT_TASK: 1477 case COMMAND_COMPLETE: 1478 if (host->scsi.phase != PHASE_STATUSIN) { 1479 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", 1480 host->host->host_no, acornscsi_target(host)); 1481 acornscsi_dumplog(host, host->SCpnt->device->id); 1482 } 1483 host->scsi.phase = PHASE_DONE; 1484 host->scsi.SCp.Message = message[0]; 1485 break; 1486 1487 case SAVE_POINTERS: 1488 /* 1489 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) 1490 * 'The SAVE DATA POINTER message is sent from a target to 1491 * direct the initiator to copy the active data pointer to 1492 * the saved data pointer for the current I/O process. 1493 */ 1494 acornscsi_dma_cleanup(host); 1495 host->SCpnt->SCp = host->scsi.SCp; 1496 host->SCpnt->SCp.sent_command = 0; 1497 host->scsi.phase = PHASE_MSGIN; 1498 break; 1499 1500 case RESTORE_POINTERS: 1501 /* 1502 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) 1503 * 'The RESTORE POINTERS message is sent from a target to 1504 * direct the initiator to copy the most recently saved 1505 * command, data, and status pointers for the I/O process 1506 * to the corresponding active pointers. The command and 1507 * status pointers shall be restored to the beginning of 1508 * the present command and status areas.' 1509 */ 1510 acornscsi_dma_cleanup(host); 1511 host->scsi.SCp = host->SCpnt->SCp; 1512 host->scsi.phase = PHASE_MSGIN; 1513 break; 1514 1515 case DISCONNECT: 1516 /* 1517 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) 1518 * 'On those occasions when an error or exception condition occurs 1519 * and the target elects to repeat the information transfer, the 1520 * target may repeat the transfer either issuing a RESTORE POINTERS 1521 * message or by disconnecting without issuing a SAVE POINTERS 1522 * message. When reconnection is completed, the most recent 1523 * saved pointer values are restored.' 1524 */ 1525 acornscsi_dma_cleanup(host); 1526 host->scsi.phase = PHASE_DISCONNECT; 1527 break; 1528 1529 case MESSAGE_REJECT: 1530 #if 0 /* this isn't needed any more */ 1531 /* 1532 * If we were negociating sync transfer, we don't yet know if 1533 * this REJECT is for the sync transfer or for the tagged queue/wide 1534 * transfer. Re-initiate sync transfer negotiation now, and if 1535 * we got a REJECT in response to SDTR, then it'll be set to DONE. 1536 */ 1537 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) 1538 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; 1539 #endif 1540 1541 /* 1542 * If we have any messages waiting to go out, then assert ATN now 1543 */ 1544 if (msgqueue_msglength(&host->scsi.msgs)) 1545 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1546 1547 switch (host->scsi.last_message) { 1548 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): 1549 /* 1550 * Target can't handle synchronous transfers 1551 */ 1552 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", 1553 host->host->host_no, acornscsi_target(host)); 1554 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; 1555 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; 1556 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1557 break; 1558 1559 default: 1560 break; 1561 } 1562 break; 1563 1564 case SIMPLE_QUEUE_TAG: 1565 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ 1566 printk("scsi%d.%c: reconnect queue tag %02X\n", 1567 host->host->host_no, acornscsi_target(host), 1568 message[1]); 1569 break; 1570 1571 case EXTENDED_MESSAGE: 1572 switch (message[2]) { 1573 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1574 case EXTENDED_SDTR: 1575 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { 1576 /* 1577 * We requested synchronous transfers. This isn't quite right... 1578 * We can only say if this succeeded if we proceed on to execute the 1579 * command from this message. If we get a MESSAGE PARITY ERROR, 1580 * and the target retries fail, then we fallback to asynchronous mode 1581 */ 1582 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; 1583 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", 1584 host->host->host_no, acornscsi_target(host), 1585 message[4], message[3] * 4); 1586 host->device[host->SCpnt->device->id].sync_xfer = 1587 calc_sync_xfer(message[3] * 4, message[4]); 1588 } else { 1589 unsigned char period, length; 1590 /* 1591 * Target requested synchronous transfers. The agreement is only 1592 * to be in operation AFTER the target leaves message out phase. 1593 */ 1594 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1595 period = max_t(unsigned int, message[3], sdtr_period / 4); 1596 length = min_t(unsigned int, message[4], sdtr_size); 1597 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, 1598 EXTENDED_SDTR, period, length); 1599 host->device[host->SCpnt->device->id].sync_xfer = 1600 calc_sync_xfer(period * 4, length); 1601 } 1602 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1603 break; 1604 #else 1605 /* We do not accept synchronous transfers. Respond with a 1606 * MESSAGE_REJECT. 1607 */ 1608 #endif 1609 1610 case EXTENDED_WDTR: 1611 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT 1612 * to a wide data transfer request. 1613 */ 1614 default: 1615 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1616 msgqueue_flush(&host->scsi.msgs); 1617 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1618 break; 1619 } 1620 break; 1621 1622 default: /* reject message */ 1623 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", 1624 host->host->host_no, acornscsi_target(host), 1625 message[0]); 1626 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1627 msgqueue_flush(&host->scsi.msgs); 1628 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1629 host->scsi.phase = PHASE_MSGIN; 1630 break; 1631 } 1632 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1633 } 1634 1635 /* 1636 * Function: int acornscsi_buildmessages(AS_Host *host) 1637 * Purpose : build the connection messages for a host 1638 * Params : host - host to add messages to 1639 */ 1640 static 1641 void acornscsi_buildmessages(AS_Host *host) 1642 { 1643 #if 0 1644 /* does the device need resetting? */ 1645 if (cmd_reset) { 1646 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); 1647 return; 1648 } 1649 #endif 1650 1651 msgqueue_addmsg(&host->scsi.msgs, 1, 1652 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, 1653 host->SCpnt->device->lun)); 1654 1655 #if 0 1656 /* does the device need the current command aborted */ 1657 if (cmd_aborted) { 1658 acornscsi_abortcmd(host); 1659 return; 1660 } 1661 #endif 1662 1663 1664 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1665 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { 1666 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; 1667 msgqueue_addmsg(&host->scsi.msgs, 5, 1668 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1669 sdtr_period / 4, sdtr_size); 1670 } 1671 #endif 1672 } 1673 1674 /* 1675 * Function: int acornscsi_starttransfer(AS_Host *host) 1676 * Purpose : transfer data to/from connected target 1677 * Params : host - host to which target is connected 1678 * Returns : 0 if failure 1679 */ 1680 static 1681 int acornscsi_starttransfer(AS_Host *host) 1682 { 1683 int residual; 1684 1685 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { 1686 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", 1687 host->host->host_no, acornscsi_target(host)); 1688 return 0; 1689 } 1690 1691 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; 1692 1693 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1694 sbic_arm_writenext(host, residual >> 16); 1695 sbic_arm_writenext(host, residual >> 8); 1696 sbic_arm_writenext(host, residual); 1697 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1698 return 1; 1699 } 1700 1701 /* ========================================================================================= 1702 * Connection & Disconnection 1703 */ 1704 /* 1705 * Function : acornscsi_reconnect(AS_Host *host) 1706 * Purpose : reconnect a previously disconnected command 1707 * Params : host - host specific data 1708 * Remarks : SCSI spec says: 1709 * 'The set of active pointers is restored from the set 1710 * of saved pointers upon reconnection of the I/O process' 1711 */ 1712 static 1713 int acornscsi_reconnect(AS_Host *host) 1714 { 1715 unsigned int target, lun, ok = 0; 1716 1717 target = sbic_arm_read(host, SBIC_SOURCEID); 1718 1719 if (!(target & 8)) 1720 printk(KERN_ERR "scsi%d: invalid source id after reselection " 1721 "- device fault?\n", 1722 host->host->host_no); 1723 1724 target &= 7; 1725 1726 if (host->SCpnt && !host->scsi.disconnectable) { 1727 printk(KERN_ERR "scsi%d.%d: reconnected while command in " 1728 "progress to target %d?\n", 1729 host->host->host_no, target, host->SCpnt->device->id); 1730 host->SCpnt = NULL; 1731 } 1732 1733 lun = sbic_arm_read(host, SBIC_DATA) & 7; 1734 1735 host->scsi.reconnected.target = target; 1736 host->scsi.reconnected.lun = lun; 1737 host->scsi.reconnected.tag = 0; 1738 1739 if (host->scsi.disconnectable && host->SCpnt && 1740 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun) 1741 ok = 1; 1742 1743 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun)) 1744 ok = 1; 1745 1746 ADD_STATUS(target, 0x81, host->scsi.phase, 0); 1747 1748 if (ok) { 1749 host->scsi.phase = PHASE_RECONNECTED; 1750 } else { 1751 /* this doesn't seem to work */ 1752 printk(KERN_ERR "scsi%d.%c: reselected with no command " 1753 "to reconnect with\n", 1754 host->host->host_no, '0' + target); 1755 acornscsi_dumplog(host, target); 1756 acornscsi_abortcmd(host); 1757 if (host->SCpnt) { 1758 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1759 host->SCpnt = NULL; 1760 } 1761 } 1762 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1763 return !ok; 1764 } 1765 1766 /* 1767 * Function: int acornscsi_reconnect_finish(AS_Host *host) 1768 * Purpose : finish reconnecting a command 1769 * Params : host - host to complete 1770 * Returns : 0 if failed 1771 */ 1772 static 1773 int acornscsi_reconnect_finish(AS_Host *host) 1774 { 1775 if (host->scsi.disconnectable && host->SCpnt) { 1776 host->scsi.disconnectable = 0; 1777 if (host->SCpnt->device->id == host->scsi.reconnected.target && 1778 host->SCpnt->device->lun == host->scsi.reconnected.lun && 1779 scsi_cmd_to_tag(host->SCpnt) == host->scsi.reconnected.tag) { 1780 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1781 DBG(host->SCpnt, printk("scsi%d.%c: reconnected", 1782 host->host->host_no, acornscsi_target(host))); 1783 #endif 1784 } else { 1785 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1786 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1787 DBG(host->SCpnt, printk("scsi%d.%c: had to move command " 1788 "to disconnected queue\n", 1789 host->host->host_no, acornscsi_target(host))); 1790 #endif 1791 host->SCpnt = NULL; 1792 } 1793 } 1794 if (!host->SCpnt) { 1795 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected, 1796 host->scsi.reconnected.target, 1797 host->scsi.reconnected.lun, 1798 host->scsi.reconnected.tag); 1799 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1800 DBG(host->SCpnt, printk("scsi%d.%c: had to get command", 1801 host->host->host_no, acornscsi_target(host))); 1802 #endif 1803 } 1804 1805 if (!host->SCpnt) 1806 acornscsi_abortcmd(host); 1807 else { 1808 /* 1809 * Restore data pointer from SAVED pointers. 1810 */ 1811 host->scsi.SCp = host->SCpnt->SCp; 1812 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1813 printk(", data pointers: [%p, %X]", 1814 host->scsi.SCp.ptr, host->scsi.SCp.this_residual); 1815 #endif 1816 } 1817 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1818 printk("\n"); 1819 #endif 1820 1821 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1822 1823 return host->SCpnt != NULL; 1824 } 1825 1826 /* 1827 * Function: void acornscsi_disconnect_unexpected(AS_Host *host) 1828 * Purpose : handle an unexpected disconnect 1829 * Params : host - host on which disconnect occurred 1830 */ 1831 static 1832 void acornscsi_disconnect_unexpected(AS_Host *host) 1833 { 1834 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n", 1835 host->host->host_no, acornscsi_target(host)); 1836 #if (DEBUG & DEBUG_ABORT) 1837 acornscsi_dumplog(host, 8); 1838 #endif 1839 1840 acornscsi_done(host, &host->SCpnt, DID_ERROR); 1841 } 1842 1843 /* 1844 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag) 1845 * Purpose : abort a currently executing command 1846 * Params : host - host with connected command to abort 1847 */ 1848 static 1849 void acornscsi_abortcmd(AS_Host *host) 1850 { 1851 host->scsi.phase = PHASE_ABORTED; 1852 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); 1853 1854 msgqueue_flush(&host->scsi.msgs); 1855 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); 1856 } 1857 1858 /* ========================================================================================== 1859 * Interrupt routines. 1860 */ 1861 /* 1862 * Function: int acornscsi_sbicintr(AS_Host *host) 1863 * Purpose : handle interrupts from SCSI device 1864 * Params : host - host to process 1865 * Returns : INTR_PROCESS if expecting another SBIC interrupt 1866 * INTR_IDLE if no interrupt 1867 * INTR_NEXT_COMMAND if we have finished processing the command 1868 */ 1869 static 1870 intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq) 1871 { 1872 unsigned int asr, ssr; 1873 1874 asr = sbic_arm_read(host, SBIC_ASR); 1875 if (!(asr & ASR_INT)) 1876 return INTR_IDLE; 1877 1878 ssr = sbic_arm_read(host, SBIC_SSR); 1879 1880 #if (DEBUG & DEBUG_PHASES) 1881 print_sbic_status(asr, ssr, host->scsi.phase); 1882 #endif 1883 1884 ADD_STATUS(8, ssr, host->scsi.phase, in_irq); 1885 1886 if (host->SCpnt && !host->scsi.disconnectable) 1887 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 1888 1889 switch (ssr) { 1890 case 0x00: /* reset state - not advanced */ 1891 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n", 1892 host->host->host_no); 1893 /* setup sbic - WD33C93A */ 1894 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 1895 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 1896 return INTR_IDLE; 1897 1898 case 0x01: /* reset state - advanced */ 1899 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 1900 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 1901 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 1902 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 1903 msgqueue_flush(&host->scsi.msgs); 1904 return INTR_IDLE; 1905 1906 case 0x41: /* unexpected disconnect aborted command */ 1907 acornscsi_disconnect_unexpected(host); 1908 return INTR_NEXT_COMMAND; 1909 } 1910 1911 switch (host->scsi.phase) { 1912 case PHASE_CONNECTING: /* STATE: command removed from issue queue */ 1913 switch (ssr) { 1914 case 0x11: /* -> PHASE_CONNECTED */ 1915 /* BUS FREE -> SELECTION */ 1916 host->scsi.phase = PHASE_CONNECTED; 1917 msgqueue_flush(&host->scsi.msgs); 1918 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1919 /* 33C93 gives next interrupt indicating bus phase */ 1920 asr = sbic_arm_read(host, SBIC_ASR); 1921 if (!(asr & ASR_INT)) 1922 break; 1923 ssr = sbic_arm_read(host, SBIC_SSR); 1924 ADD_STATUS(8, ssr, host->scsi.phase, 1); 1925 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1); 1926 goto connected; 1927 1928 case 0x42: /* select timed out */ 1929 /* -> PHASE_IDLE */ 1930 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT); 1931 return INTR_NEXT_COMMAND; 1932 1933 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 1934 /* BUS FREE -> RESELECTION */ 1935 host->origSCpnt = host->SCpnt; 1936 host->SCpnt = NULL; 1937 msgqueue_flush(&host->scsi.msgs); 1938 acornscsi_reconnect(host); 1939 break; 1940 1941 default: 1942 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n", 1943 host->host->host_no, acornscsi_target(host), ssr); 1944 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 1945 acornscsi_abortcmd(host); 1946 } 1947 return INTR_PROCESSING; 1948 1949 connected: 1950 case PHASE_CONNECTED: /* STATE: device selected ok */ 1951 switch (ssr) { 1952 #ifdef NONSTANDARD 1953 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 1954 /* SELECTION -> COMMAND */ 1955 acornscsi_sendcommand(host); 1956 break; 1957 1958 case 0x8b: /* -> PHASE_STATUS */ 1959 /* SELECTION -> STATUS */ 1960 acornscsi_readstatusbyte(host); 1961 host->scsi.phase = PHASE_STATUSIN; 1962 break; 1963 #endif 1964 1965 case 0x8e: /* -> PHASE_MSGOUT */ 1966 /* SELECTION ->MESSAGE OUT */ 1967 host->scsi.phase = PHASE_MSGOUT; 1968 acornscsi_buildmessages(host); 1969 acornscsi_sendmessage(host); 1970 break; 1971 1972 /* these should not happen */ 1973 case 0x85: /* target disconnected */ 1974 acornscsi_done(host, &host->SCpnt, DID_ERROR); 1975 break; 1976 1977 default: 1978 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n", 1979 host->host->host_no, acornscsi_target(host), ssr); 1980 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 1981 acornscsi_abortcmd(host); 1982 } 1983 return INTR_PROCESSING; 1984 1985 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */ 1986 /* 1987 * SCSI standard says that MESSAGE OUT phases can be followed by a 1988 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase 1989 */ 1990 switch (ssr) { 1991 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 1992 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 1993 /* MESSAGE OUT -> COMMAND */ 1994 acornscsi_sendcommand(host); 1995 break; 1996 1997 case 0x8b: /* -> PHASE_STATUS */ 1998 case 0x1b: /* -> PHASE_STATUS */ 1999 /* MESSAGE OUT -> STATUS */ 2000 acornscsi_readstatusbyte(host); 2001 host->scsi.phase = PHASE_STATUSIN; 2002 break; 2003 2004 case 0x8e: /* -> PHASE_MSGOUT */ 2005 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ 2006 acornscsi_sendmessage(host); 2007 break; 2008 2009 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2010 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2011 /* MESSAGE OUT -> MESSAGE IN */ 2012 acornscsi_message(host); 2013 break; 2014 2015 default: 2016 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n", 2017 host->host->host_no, acornscsi_target(host), ssr); 2018 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2019 } 2020 return INTR_PROCESSING; 2021 2022 case PHASE_COMMAND: /* STATE: connected & command sent */ 2023 switch (ssr) { 2024 case 0x18: /* -> PHASE_DATAOUT */ 2025 /* COMMAND -> DATA OUT */ 2026 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2027 acornscsi_abortcmd(host); 2028 acornscsi_dma_setup(host, DMA_OUT); 2029 if (!acornscsi_starttransfer(host)) 2030 acornscsi_abortcmd(host); 2031 host->scsi.phase = PHASE_DATAOUT; 2032 return INTR_IDLE; 2033 2034 case 0x19: /* -> PHASE_DATAIN */ 2035 /* COMMAND -> DATA IN */ 2036 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2037 acornscsi_abortcmd(host); 2038 acornscsi_dma_setup(host, DMA_IN); 2039 if (!acornscsi_starttransfer(host)) 2040 acornscsi_abortcmd(host); 2041 host->scsi.phase = PHASE_DATAIN; 2042 return INTR_IDLE; 2043 2044 case 0x1b: /* -> PHASE_STATUS */ 2045 /* COMMAND -> STATUS */ 2046 acornscsi_readstatusbyte(host); 2047 host->scsi.phase = PHASE_STATUSIN; 2048 break; 2049 2050 case 0x1e: /* -> PHASE_MSGOUT */ 2051 /* COMMAND -> MESSAGE OUT */ 2052 acornscsi_sendmessage(host); 2053 break; 2054 2055 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2056 /* COMMAND -> MESSAGE IN */ 2057 acornscsi_message(host); 2058 break; 2059 2060 default: 2061 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n", 2062 host->host->host_no, acornscsi_target(host), ssr); 2063 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2064 } 2065 return INTR_PROCESSING; 2066 2067 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ 2068 if (ssr == 0x85) { /* -> PHASE_IDLE */ 2069 host->scsi.disconnectable = 1; 2070 host->scsi.reconnected.tag = 0; 2071 host->scsi.phase = PHASE_IDLE; 2072 host->stats.disconnects += 1; 2073 } else { 2074 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n", 2075 host->host->host_no, acornscsi_target(host), ssr); 2076 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2077 } 2078 return INTR_NEXT_COMMAND; 2079 2080 case PHASE_IDLE: /* STATE: disconnected */ 2081 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 2082 acornscsi_reconnect(host); 2083 else { 2084 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n", 2085 host->host->host_no, acornscsi_target(host), ssr); 2086 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2087 } 2088 return INTR_PROCESSING; 2089 2090 case PHASE_RECONNECTED: /* STATE: device reconnected to initiator */ 2091 /* 2092 * Command reconnected - if MESGIN, get message - it may be 2093 * the tag. If not, get command out of disconnected queue 2094 */ 2095 /* 2096 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY, 2097 * reconnect I_T_L command 2098 */ 2099 if (ssr != 0x8f && !acornscsi_reconnect_finish(host)) 2100 return INTR_IDLE; 2101 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 2102 switch (ssr) { 2103 case 0x88: /* data out phase */ 2104 /* -> PHASE_DATAOUT */ 2105 /* MESSAGE IN -> DATA OUT */ 2106 acornscsi_dma_setup(host, DMA_OUT); 2107 if (!acornscsi_starttransfer(host)) 2108 acornscsi_abortcmd(host); 2109 host->scsi.phase = PHASE_DATAOUT; 2110 return INTR_IDLE; 2111 2112 case 0x89: /* data in phase */ 2113 /* -> PHASE_DATAIN */ 2114 /* MESSAGE IN -> DATA IN */ 2115 acornscsi_dma_setup(host, DMA_IN); 2116 if (!acornscsi_starttransfer(host)) 2117 acornscsi_abortcmd(host); 2118 host->scsi.phase = PHASE_DATAIN; 2119 return INTR_IDLE; 2120 2121 case 0x8a: /* command out */ 2122 /* MESSAGE IN -> COMMAND */ 2123 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2124 break; 2125 2126 case 0x8b: /* status in */ 2127 /* -> PHASE_STATUSIN */ 2128 /* MESSAGE IN -> STATUS */ 2129 acornscsi_readstatusbyte(host); 2130 host->scsi.phase = PHASE_STATUSIN; 2131 break; 2132 2133 case 0x8e: /* message out */ 2134 /* -> PHASE_MSGOUT */ 2135 /* MESSAGE IN -> MESSAGE OUT */ 2136 acornscsi_sendmessage(host); 2137 break; 2138 2139 case 0x8f: /* message in */ 2140 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2141 break; 2142 2143 default: 2144 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n", 2145 host->host->host_no, acornscsi_target(host), ssr); 2146 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2147 } 2148 return INTR_PROCESSING; 2149 2150 case PHASE_DATAIN: /* STATE: transferred data in */ 2151 /* 2152 * This is simple - if we disconnect then the DMA address & count is 2153 * correct. 2154 */ 2155 switch (ssr) { 2156 case 0x19: /* -> PHASE_DATAIN */ 2157 case 0x89: /* -> PHASE_DATAIN */ 2158 acornscsi_abortcmd(host); 2159 return INTR_IDLE; 2160 2161 case 0x1b: /* -> PHASE_STATUSIN */ 2162 case 0x4b: /* -> PHASE_STATUSIN */ 2163 case 0x8b: /* -> PHASE_STATUSIN */ 2164 /* DATA IN -> STATUS */ 2165 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2166 acornscsi_sbic_xfcount(host); 2167 acornscsi_dma_stop(host); 2168 acornscsi_readstatusbyte(host); 2169 host->scsi.phase = PHASE_STATUSIN; 2170 break; 2171 2172 case 0x1e: /* -> PHASE_MSGOUT */ 2173 case 0x4e: /* -> PHASE_MSGOUT */ 2174 case 0x8e: /* -> PHASE_MSGOUT */ 2175 /* DATA IN -> MESSAGE OUT */ 2176 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2177 acornscsi_sbic_xfcount(host); 2178 acornscsi_dma_stop(host); 2179 acornscsi_sendmessage(host); 2180 break; 2181 2182 case 0x1f: /* message in */ 2183 case 0x4f: /* message in */ 2184 case 0x8f: /* message in */ 2185 /* DATA IN -> MESSAGE IN */ 2186 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2187 acornscsi_sbic_xfcount(host); 2188 acornscsi_dma_stop(host); 2189 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2190 break; 2191 2192 default: 2193 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n", 2194 host->host->host_no, acornscsi_target(host), ssr); 2195 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2196 } 2197 return INTR_PROCESSING; 2198 2199 case PHASE_DATAOUT: /* STATE: transferred data out */ 2200 /* 2201 * This is more complicated - if we disconnect, the DMA could be 12 2202 * bytes ahead of us. We need to correct this. 2203 */ 2204 switch (ssr) { 2205 case 0x18: /* -> PHASE_DATAOUT */ 2206 case 0x88: /* -> PHASE_DATAOUT */ 2207 acornscsi_abortcmd(host); 2208 return INTR_IDLE; 2209 2210 case 0x1b: /* -> PHASE_STATUSIN */ 2211 case 0x4b: /* -> PHASE_STATUSIN */ 2212 case 0x8b: /* -> PHASE_STATUSIN */ 2213 /* DATA OUT -> STATUS */ 2214 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2215 acornscsi_sbic_xfcount(host); 2216 acornscsi_dma_stop(host); 2217 acornscsi_dma_adjust(host); 2218 acornscsi_readstatusbyte(host); 2219 host->scsi.phase = PHASE_STATUSIN; 2220 break; 2221 2222 case 0x1e: /* -> PHASE_MSGOUT */ 2223 case 0x4e: /* -> PHASE_MSGOUT */ 2224 case 0x8e: /* -> PHASE_MSGOUT */ 2225 /* DATA OUT -> MESSAGE OUT */ 2226 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2227 acornscsi_sbic_xfcount(host); 2228 acornscsi_dma_stop(host); 2229 acornscsi_dma_adjust(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 OUT -> MESSAGE IN */ 2237 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2238 acornscsi_sbic_xfcount(host); 2239 acornscsi_dma_stop(host); 2240 acornscsi_dma_adjust(host); 2241 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2242 break; 2243 2244 default: 2245 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n", 2246 host->host->host_no, acornscsi_target(host), ssr); 2247 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2248 } 2249 return INTR_PROCESSING; 2250 2251 case PHASE_STATUSIN: /* STATE: status in complete */ 2252 switch (ssr) { 2253 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2254 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2255 /* STATUS -> MESSAGE IN */ 2256 acornscsi_message(host); 2257 break; 2258 2259 case 0x1e: /* -> PHASE_MSGOUT */ 2260 case 0x8e: /* -> PHASE_MSGOUT */ 2261 /* STATUS -> MESSAGE OUT */ 2262 acornscsi_sendmessage(host); 2263 break; 2264 2265 default: 2266 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n", 2267 host->host->host_no, acornscsi_target(host), ssr); 2268 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2269 } 2270 return INTR_PROCESSING; 2271 2272 case PHASE_MSGIN: /* STATE: message in */ 2273 switch (ssr) { 2274 case 0x1e: /* -> PHASE_MSGOUT */ 2275 case 0x4e: /* -> PHASE_MSGOUT */ 2276 case 0x8e: /* -> PHASE_MSGOUT */ 2277 /* MESSAGE IN -> MESSAGE OUT */ 2278 acornscsi_sendmessage(host); 2279 break; 2280 2281 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2282 case 0x2f: 2283 case 0x4f: 2284 case 0x8f: 2285 acornscsi_message(host); 2286 break; 2287 2288 case 0x85: 2289 printk("scsi%d.%c: strange message in disconnection\n", 2290 host->host->host_no, acornscsi_target(host)); 2291 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2292 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2293 break; 2294 2295 default: 2296 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\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_DONE: /* STATE: received status & message */ 2303 switch (ssr) { 2304 case 0x85: /* -> PHASE_IDLE */ 2305 acornscsi_done(host, &host->SCpnt, DID_OK); 2306 return INTR_NEXT_COMMAND; 2307 2308 case 0x1e: 2309 case 0x8e: 2310 acornscsi_sendmessage(host); 2311 break; 2312 2313 default: 2314 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n", 2315 host->host->host_no, acornscsi_target(host), ssr); 2316 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2317 } 2318 return INTR_PROCESSING; 2319 2320 case PHASE_ABORTED: 2321 switch (ssr) { 2322 case 0x85: 2323 if (host->SCpnt) 2324 acornscsi_done(host, &host->SCpnt, DID_ABORT); 2325 else { 2326 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun, 2327 host->busyluns); 2328 host->scsi.phase = PHASE_IDLE; 2329 } 2330 return INTR_NEXT_COMMAND; 2331 2332 case 0x1e: 2333 case 0x2e: 2334 case 0x4e: 2335 case 0x8e: 2336 acornscsi_sendmessage(host); 2337 break; 2338 2339 default: 2340 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n", 2341 host->host->host_no, acornscsi_target(host), ssr); 2342 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2343 } 2344 return INTR_PROCESSING; 2345 2346 default: 2347 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\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 2354 /* 2355 * Prototype: void acornscsi_intr(int irq, void *dev_id) 2356 * Purpose : handle interrupts from Acorn SCSI card 2357 * Params : irq - interrupt number 2358 * dev_id - device specific data (AS_Host structure) 2359 */ 2360 static irqreturn_t 2361 acornscsi_intr(int irq, void *dev_id) 2362 { 2363 AS_Host *host = (AS_Host *)dev_id; 2364 intr_ret_t ret; 2365 int iostatus; 2366 int in_irq = 0; 2367 2368 do { 2369 ret = INTR_IDLE; 2370 2371 iostatus = readb(host->fast + INT_REG); 2372 2373 if (iostatus & 2) { 2374 acornscsi_dma_intr(host); 2375 iostatus = readb(host->fast + INT_REG); 2376 } 2377 2378 if (iostatus & 8) 2379 ret = acornscsi_sbicintr(host, in_irq); 2380 2381 /* 2382 * If we have a transfer pending, start it. 2383 * Only start it if the interface has already started transferring 2384 * it's data 2385 */ 2386 if (host->dma.xfer_required) 2387 acornscsi_dma_xfer(host); 2388 2389 if (ret == INTR_NEXT_COMMAND) 2390 ret = acornscsi_kick(host); 2391 2392 in_irq = 1; 2393 } while (ret != INTR_IDLE); 2394 2395 return IRQ_HANDLED; 2396 } 2397 2398 /*============================================================================================= 2399 * Interfaces between interrupt handler and rest of scsi code 2400 */ 2401 2402 /* 2403 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2404 * Purpose : queues a SCSI command 2405 * Params : cmd - SCSI command 2406 * done - function called on completion, with pointer to command descriptor 2407 * Returns : 0, or < 0 on error. 2408 */ 2409 static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt, 2410 void (*done)(struct scsi_cmnd *)) 2411 { 2412 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2413 2414 if (!done) { 2415 /* there should be some way of rejecting errors like this without panicing... */ 2416 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]", 2417 host->host->host_no, SCpnt); 2418 return -EINVAL; 2419 } 2420 2421 #if (DEBUG & DEBUG_NO_WRITE) 2422 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) { 2423 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n", 2424 host->host->host_no, '0' + SCpnt->device->id); 2425 set_host_byte(SCpnt, DID_NO_CONNECT); 2426 done(SCpnt); 2427 return 0; 2428 } 2429 #endif 2430 2431 SCpnt->scsi_done = done; 2432 SCpnt->host_scribble = NULL; 2433 SCpnt->result = 0; 2434 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); 2435 SCpnt->SCp.sent_command = 0; 2436 SCpnt->SCp.scsi_xferred = 0; 2437 2438 init_SCp(SCpnt); 2439 2440 host->stats.queues += 1; 2441 2442 { 2443 unsigned long flags; 2444 2445 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { 2446 set_host_byte(SCpnt, DID_ERROR); 2447 done(SCpnt); 2448 return 0; 2449 } 2450 local_irq_save(flags); 2451 if (host->scsi.phase == PHASE_IDLE) 2452 acornscsi_kick(host); 2453 local_irq_restore(flags); 2454 } 2455 return 0; 2456 } 2457 2458 DEF_SCSI_QCMD(acornscsi_queuecmd) 2459 2460 enum res_abort { res_not_running, res_success, res_success_clear, res_snooze }; 2461 2462 /* 2463 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt) 2464 * Purpose : abort a command on this host 2465 * Params : SCpnt - command to abort 2466 * Returns : our abort status 2467 */ 2468 static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt) 2469 { 2470 enum res_abort res = res_not_running; 2471 2472 if (queue_remove_cmd(&host->queues.issue, SCpnt)) { 2473 /* 2474 * The command was on the issue queue, and has not been 2475 * issued yet. We can remove the command from the queue, 2476 * and acknowledge the abort. Neither the devices nor the 2477 * interface know about the command. 2478 */ 2479 //#if (DEBUG & DEBUG_ABORT) 2480 printk("on issue queue "); 2481 //#endif 2482 res = res_success; 2483 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) { 2484 /* 2485 * The command was on the disconnected queue. Simply 2486 * acknowledge the abort condition, and when the target 2487 * reconnects, we will give it an ABORT message. The 2488 * target should then disconnect, and we will clear 2489 * the busylun bit. 2490 */ 2491 //#if (DEBUG & DEBUG_ABORT) 2492 printk("on disconnected queue "); 2493 //#endif 2494 res = res_success; 2495 } else if (host->SCpnt == SCpnt) { 2496 unsigned long flags; 2497 2498 //#if (DEBUG & DEBUG_ABORT) 2499 printk("executing "); 2500 //#endif 2501 2502 local_irq_save(flags); 2503 switch (host->scsi.phase) { 2504 /* 2505 * If the interface is idle, and the command is 'disconnectable', 2506 * then it is the same as on the disconnected queue. We simply 2507 * remove all traces of the command. When the target reconnects, 2508 * we will give it an ABORT message since the command could not 2509 * be found. When the target finally disconnects, we will clear 2510 * the busylun bit. 2511 */ 2512 case PHASE_IDLE: 2513 if (host->scsi.disconnectable) { 2514 host->scsi.disconnectable = 0; 2515 host->SCpnt = NULL; 2516 res = res_success; 2517 } 2518 break; 2519 2520 /* 2521 * If the command has connected and done nothing further, 2522 * simply force a disconnect. We also need to clear the 2523 * busylun bit. 2524 */ 2525 case PHASE_CONNECTED: 2526 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT); 2527 host->SCpnt = NULL; 2528 res = res_success_clear; 2529 break; 2530 2531 default: 2532 acornscsi_abortcmd(host); 2533 res = res_snooze; 2534 } 2535 local_irq_restore(flags); 2536 } else if (host->origSCpnt == SCpnt) { 2537 /* 2538 * The command will be executed next, but a command 2539 * is currently using the interface. This is similar to 2540 * being on the issue queue, except the busylun bit has 2541 * been set. 2542 */ 2543 host->origSCpnt = NULL; 2544 //#if (DEBUG & DEBUG_ABORT) 2545 printk("waiting for execution "); 2546 //#endif 2547 res = res_success_clear; 2548 } else 2549 printk("unknown "); 2550 2551 return res; 2552 } 2553 2554 /* 2555 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt) 2556 * Purpose : abort a command on this host 2557 * Params : SCpnt - command to abort 2558 * Returns : one of SCSI_ABORT_ macros 2559 */ 2560 int acornscsi_abort(struct scsi_cmnd *SCpnt) 2561 { 2562 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata; 2563 int result; 2564 2565 host->stats.aborts += 1; 2566 2567 #if (DEBUG & DEBUG_ABORT) 2568 { 2569 int asr, ssr; 2570 asr = sbic_arm_read(host, SBIC_ASR); 2571 ssr = sbic_arm_read(host, SBIC_SSR); 2572 2573 printk(KERN_WARNING "acornscsi_abort: "); 2574 print_sbic_status(asr, ssr, host->scsi.phase); 2575 acornscsi_dumplog(host, SCpnt->device->id); 2576 } 2577 #endif 2578 2579 printk("scsi%d: ", host->host->host_no); 2580 2581 switch (acornscsi_do_abort(host, SCpnt)) { 2582 /* 2583 * We managed to find the command and cleared it out. 2584 * We do not expect the command to be executing on the 2585 * target, but we have set the busylun bit. 2586 */ 2587 case res_success_clear: 2588 //#if (DEBUG & DEBUG_ABORT) 2589 printk("clear "); 2590 //#endif 2591 clear_bit(SCpnt->device->id * 8 + 2592 (u8)(SCpnt->device->lun & 0x7), host->busyluns); 2593 fallthrough; 2594 2595 /* 2596 * We found the command, and cleared it out. Either 2597 * the command is still known to be executing on the 2598 * target, or the busylun bit is not set. 2599 */ 2600 case res_success: 2601 //#if (DEBUG & DEBUG_ABORT) 2602 printk("success\n"); 2603 //#endif 2604 result = SUCCESS; 2605 break; 2606 2607 /* 2608 * We did find the command, but unfortunately we couldn't 2609 * unhook it from ourselves. Wait some more, and if it 2610 * still doesn't complete, reset the interface. 2611 */ 2612 case res_snooze: 2613 //#if (DEBUG & DEBUG_ABORT) 2614 printk("snooze\n"); 2615 //#endif 2616 result = FAILED; 2617 break; 2618 2619 /* 2620 * The command could not be found (either because it completed, 2621 * or it got dropped. 2622 */ 2623 default: 2624 case res_not_running: 2625 acornscsi_dumplog(host, SCpnt->device->id); 2626 result = FAILED; 2627 //#if (DEBUG & DEBUG_ABORT) 2628 printk("not running\n"); 2629 //#endif 2630 break; 2631 } 2632 2633 return result; 2634 } 2635 2636 /* 2637 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt) 2638 * Purpose : reset a command on this host/reset this host 2639 * Params : SCpnt - command causing reset 2640 * Returns : one of SCSI_RESET_ macros 2641 */ 2642 int acornscsi_host_reset(struct scsi_cmnd *SCpnt) 2643 { 2644 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2645 struct scsi_cmnd *SCptr; 2646 2647 host->stats.resets += 1; 2648 2649 #if (DEBUG & DEBUG_RESET) 2650 { 2651 int asr, ssr, devidx; 2652 2653 asr = sbic_arm_read(host, SBIC_ASR); 2654 ssr = sbic_arm_read(host, SBIC_SSR); 2655 2656 printk(KERN_WARNING "acornscsi_reset: "); 2657 print_sbic_status(asr, ssr, host->scsi.phase); 2658 for (devidx = 0; devidx < 9; devidx++) 2659 acornscsi_dumplog(host, devidx); 2660 } 2661 #endif 2662 2663 acornscsi_dma_stop(host); 2664 2665 /* 2666 * do hard reset. This resets all devices on this host, and so we 2667 * must set the reset status on all commands. 2668 */ 2669 acornscsi_resetcard(host); 2670 2671 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL) 2672 ; 2673 2674 return SUCCESS; 2675 } 2676 2677 /*============================================================================================== 2678 * initialisation & miscellaneous support 2679 */ 2680 2681 /* 2682 * Function: char *acornscsi_info(struct Scsi_Host *host) 2683 * Purpose : return a string describing this interface 2684 * Params : host - host to give information on 2685 * Returns : a constant string 2686 */ 2687 const 2688 char *acornscsi_info(struct Scsi_Host *host) 2689 { 2690 static char string[100], *p; 2691 2692 p = string; 2693 2694 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d" 2695 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2696 " SYNC" 2697 #endif 2698 #if (DEBUG & DEBUG_NO_WRITE) 2699 " NOWRITE (" __stringify(NO_WRITE) ")" 2700 #endif 2701 , host->hostt->name, host->io_port, host->irq, 2702 VER_MAJOR, VER_MINOR, VER_PATCH); 2703 return string; 2704 } 2705 2706 static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance) 2707 { 2708 int devidx; 2709 struct scsi_device *scd; 2710 AS_Host *host; 2711 2712 host = (AS_Host *)instance->hostdata; 2713 2714 seq_printf(m, "AcornSCSI driver v%d.%d.%d" 2715 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2716 " SYNC" 2717 #endif 2718 #if (DEBUG & DEBUG_NO_WRITE) 2719 " NOWRITE (" __stringify(NO_WRITE) ")" 2720 #endif 2721 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); 2722 2723 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n", 2724 host->base + SBIC_REGIDX, host->scsi.irq); 2725 #ifdef USE_DMAC 2726 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", 2727 host->base + DMAC_OFFSET, host->scsi.irq); 2728 #endif 2729 2730 seq_printf(m, "Statistics:\n" 2731 "Queued commands: %-10u Issued commands: %-10u\n" 2732 "Done commands : %-10u Reads : %-10u\n" 2733 "Writes : %-10u Others : %-10u\n" 2734 "Disconnects : %-10u Aborts : %-10u\n" 2735 "Resets : %-10u\n\nLast phases:", 2736 host->stats.queues, host->stats.removes, 2737 host->stats.fins, host->stats.reads, 2738 host->stats.writes, host->stats.miscs, 2739 host->stats.disconnects, host->stats.aborts, 2740 host->stats.resets); 2741 2742 for (devidx = 0; devidx < 9; devidx ++) { 2743 unsigned int statptr, prev; 2744 2745 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx)); 2746 statptr = host->status_ptr[devidx] - 10; 2747 2748 if ((signed int)statptr < 0) 2749 statptr += STATUS_BUFFER_SIZE; 2750 2751 prev = host->status[devidx][statptr].when; 2752 2753 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 2754 if (host->status[devidx][statptr].when) { 2755 seq_printf(m, "%c%02X:%02X+%2ld", 2756 host->status[devidx][statptr].irq ? '-' : ' ', 2757 host->status[devidx][statptr].ph, 2758 host->status[devidx][statptr].ssr, 2759 (host->status[devidx][statptr].when - prev) < 100 ? 2760 (host->status[devidx][statptr].when - prev) : 99); 2761 prev = host->status[devidx][statptr].when; 2762 } 2763 } 2764 } 2765 2766 seq_printf(m, "\nAttached devices:\n"); 2767 2768 shost_for_each_device(scd, instance) { 2769 seq_printf(m, "Device/Lun TaggedQ Sync\n"); 2770 seq_printf(m, " %d/%llu ", scd->id, scd->lun); 2771 if (scd->tagged_supported) 2772 seq_printf(m, "%3sabled ", 2773 scd->simple_tags ? "en" : "dis"); 2774 else 2775 seq_printf(m, "unsupported "); 2776 2777 if (host->device[scd->id].sync_xfer & 15) 2778 seq_printf(m, "offset %d, %d ns\n", 2779 host->device[scd->id].sync_xfer & 15, 2780 acornscsi_getperiod(host->device[scd->id].sync_xfer)); 2781 else 2782 seq_printf(m, "async\n"); 2783 2784 } 2785 return 0; 2786 } 2787 2788 static struct scsi_host_template acornscsi_template = { 2789 .module = THIS_MODULE, 2790 .show_info = acornscsi_show_info, 2791 .name = "AcornSCSI", 2792 .info = acornscsi_info, 2793 .queuecommand = acornscsi_queuecmd, 2794 .eh_abort_handler = acornscsi_abort, 2795 .eh_host_reset_handler = acornscsi_host_reset, 2796 .can_queue = 16, 2797 .this_id = 7, 2798 .sg_tablesize = SG_ALL, 2799 .cmd_per_lun = 2, 2800 .dma_boundary = PAGE_SIZE - 1, 2801 .proc_name = "acornscsi", 2802 }; 2803 2804 static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id) 2805 { 2806 struct Scsi_Host *host; 2807 AS_Host *ashost; 2808 int ret; 2809 2810 ret = ecard_request_resources(ec); 2811 if (ret) 2812 goto out; 2813 2814 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host)); 2815 if (!host) { 2816 ret = -ENOMEM; 2817 goto out_release; 2818 } 2819 2820 ashost = (AS_Host *)host->hostdata; 2821 2822 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 2823 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 2824 if (!ashost->base || !ashost->fast) { 2825 ret = -ENOMEM; 2826 goto out_put; 2827 } 2828 2829 host->irq = ec->irq; 2830 ashost->host = host; 2831 ashost->scsi.irq = host->irq; 2832 2833 ec->irqaddr = ashost->fast + INT_REG; 2834 ec->irqmask = 0x0a; 2835 2836 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost); 2837 if (ret) { 2838 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n", 2839 host->host_no, ashost->scsi.irq, ret); 2840 goto out_put; 2841 } 2842 2843 memset(&ashost->stats, 0, sizeof (ashost->stats)); 2844 queue_initialise(&ashost->queues.issue); 2845 queue_initialise(&ashost->queues.disconnected); 2846 msgqueue_initialise(&ashost->scsi.msgs); 2847 2848 acornscsi_resetcard(ashost); 2849 2850 ret = scsi_add_host(host, &ec->dev); 2851 if (ret) 2852 goto out_irq; 2853 2854 scsi_scan_host(host); 2855 goto out; 2856 2857 out_irq: 2858 free_irq(host->irq, ashost); 2859 msgqueue_free(&ashost->scsi.msgs); 2860 queue_free(&ashost->queues.disconnected); 2861 queue_free(&ashost->queues.issue); 2862 out_put: 2863 ecardm_iounmap(ec, ashost->fast); 2864 ecardm_iounmap(ec, ashost->base); 2865 scsi_host_put(host); 2866 out_release: 2867 ecard_release_resources(ec); 2868 out: 2869 return ret; 2870 } 2871 2872 static void acornscsi_remove(struct expansion_card *ec) 2873 { 2874 struct Scsi_Host *host = ecard_get_drvdata(ec); 2875 AS_Host *ashost = (AS_Host *)host->hostdata; 2876 2877 ecard_set_drvdata(ec, NULL); 2878 scsi_remove_host(host); 2879 2880 /* 2881 * Put card into RESET state 2882 */ 2883 writeb(0x80, ashost->fast + PAGE_REG); 2884 2885 free_irq(host->irq, ashost); 2886 2887 msgqueue_free(&ashost->scsi.msgs); 2888 queue_free(&ashost->queues.disconnected); 2889 queue_free(&ashost->queues.issue); 2890 ecardm_iounmap(ec, ashost->fast); 2891 ecardm_iounmap(ec, ashost->base); 2892 scsi_host_put(host); 2893 ecard_release_resources(ec); 2894 } 2895 2896 static const struct ecard_id acornscsi_cids[] = { 2897 { MANU_ACORN, PROD_ACORN_SCSI }, 2898 { 0xffff, 0xffff }, 2899 }; 2900 2901 static struct ecard_driver acornscsi_driver = { 2902 .probe = acornscsi_probe, 2903 .remove = acornscsi_remove, 2904 .id_table = acornscsi_cids, 2905 .drv = { 2906 .name = "acornscsi", 2907 }, 2908 }; 2909 2910 static int __init acornscsi_init(void) 2911 { 2912 return ecard_register_driver(&acornscsi_driver); 2913 } 2914 2915 static void __exit acornscsi_exit(void) 2916 { 2917 ecard_remove_driver(&acornscsi_driver); 2918 } 2919 2920 module_init(acornscsi_init); 2921 module_exit(acornscsi_exit); 2922 2923 MODULE_AUTHOR("Russell King"); 2924 MODULE_DESCRIPTION("AcornSCSI driver"); 2925 MODULE_LICENSE("GPL"); 2926