1 /* 2 * linux/drivers/acorn/scsi/acornscsi.c 3 * 4 * Acorn SCSI 3 driver 5 * By R.M.King. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * Abandoned using the Select and Transfer command since there were 12 * some nasty races between our software and the target devices that 13 * were not easy to solve, and the device errata had a lot of entries 14 * for this command, some of them quite nasty... 15 * 16 * Changelog: 17 * 26-Sep-1997 RMK Re-jigged to use the queue module. 18 * Re-coded state machine to be based on driver 19 * state not scsi state. Should be easier to debug. 20 * Added acornscsi_release to clean up properly. 21 * Updated proc/scsi reporting. 22 * 05-Oct-1997 RMK Implemented writing to SCSI devices. 23 * 06-Oct-1997 RMK Corrected small (non-serious) bug with the connect/ 24 * reconnect race condition causing a warning message. 25 * 12-Oct-1997 RMK Added catch for re-entering interrupt routine. 26 * 15-Oct-1997 RMK Improved handling of commands. 27 * 27-Jun-1998 RMK Changed asm/delay.h to linux/delay.h. 28 * 13-Dec-1998 RMK Better abort code and command handling. Extra state 29 * transitions added to allow dodgy devices to work. 30 */ 31 #define DEBUG_NO_WRITE 1 32 #define DEBUG_QUEUES 2 33 #define DEBUG_DMA 4 34 #define DEBUG_ABORT 8 35 #define DEBUG_DISCON 16 36 #define DEBUG_CONNECT 32 37 #define DEBUG_PHASES 64 38 #define DEBUG_WRITE 128 39 #define DEBUG_LINK 256 40 #define DEBUG_MESSAGES 512 41 #define DEBUG_RESET 1024 42 #define DEBUG_ALL (DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\ 43 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\ 44 DEBUG_DMA|DEBUG_QUEUES) 45 46 /* DRIVER CONFIGURATION 47 * 48 * SCSI-II Tagged queue support. 49 * 50 * I don't have any SCSI devices that support it, so it is totally untested 51 * (except to make sure that it doesn't interfere with any non-tagging 52 * devices). It is not fully implemented either - what happens when a 53 * tagging device reconnects??? 54 * 55 * You can tell if you have a device that supports tagged queueing my 56 * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported 57 * as '2 TAG'. 58 * 59 * Also note that CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE is normally set in the config 60 * scripts, but disabled here. Once debugged, remove the #undef, otherwise to debug, 61 * comment out the undef. 62 */ 63 #undef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 64 /* 65 * SCSI-II Synchronous transfer support. 66 * 67 * Tried and tested... 68 * 69 * SDTR_SIZE - maximum number of un-acknowledged bytes (0 = off, 12 = max) 70 * SDTR_PERIOD - period of REQ signal (min=125, max=1020) 71 * DEFAULT_PERIOD - default REQ period. 72 */ 73 #define SDTR_SIZE 12 74 #define SDTR_PERIOD 125 75 #define DEFAULT_PERIOD 500 76 77 /* 78 * Debugging information 79 * 80 * DEBUG - bit mask from list above 81 * DEBUG_TARGET - is defined to the target number if you want to debug 82 * a specific target. [only recon/write/dma]. 83 */ 84 #define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE) 85 /* only allow writing to SCSI device 0 */ 86 #define NO_WRITE 0xFE 87 /*#define DEBUG_TARGET 2*/ 88 /* 89 * Select timeout time (in 10ms units) 90 * 91 * This is the timeout used between the start of selection and the WD33C93 92 * chip deciding that the device isn't responding. 93 */ 94 #define TIMEOUT_TIME 10 95 /* 96 * Define this if you want to have verbose explanation of SCSI 97 * status/messages. 98 */ 99 #undef CONFIG_ACORNSCSI_CONSTANTS 100 /* 101 * Define this if you want to use the on board DMAC [don't remove this option] 102 * If not set, then use PIO mode (not currently supported). 103 */ 104 #define USE_DMAC 105 106 /* 107 * ==================================================================================== 108 */ 109 110 #ifdef DEBUG_TARGET 111 #define DBG(cmd,xxx...) \ 112 if (cmd->device->id == DEBUG_TARGET) { \ 113 xxx; \ 114 } 115 #else 116 #define DBG(cmd,xxx...) xxx 117 #endif 118 119 #include <linux/module.h> 120 #include <linux/kernel.h> 121 #include <linux/string.h> 122 #include <linux/signal.h> 123 #include <linux/errno.h> 124 #include <linux/proc_fs.h> 125 #include <linux/ioport.h> 126 #include <linux/blkdev.h> 127 #include <linux/delay.h> 128 #include <linux/interrupt.h> 129 #include <linux/init.h> 130 #include <linux/bitops.h> 131 #include <linux/stringify.h> 132 #include <linux/io.h> 133 134 #include <asm/ecard.h> 135 136 #include "../scsi.h" 137 #include <scsi/scsi_dbg.h> 138 #include <scsi/scsi_host.h> 139 #include <scsi/scsi_transport_spi.h> 140 #include "acornscsi.h" 141 #include "msgqueue.h" 142 #include "scsi.h" 143 144 #include <scsi/scsicam.h> 145 146 #define VER_MAJOR 2 147 #define VER_MINOR 0 148 #define VER_PATCH 6 149 150 #ifndef ABORT_TAG 151 #define ABORT_TAG 0xd 152 #else 153 #error "Yippee! ABORT TAG is now defined! Remove this error!" 154 #endif 155 156 #ifdef USE_DMAC 157 /* 158 * DMAC setup parameters 159 */ 160 #define INIT_DEVCON0 (DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP) 161 #define INIT_DEVCON1 (DEVCON1_BHLD) 162 #define DMAC_READ (MODECON_READ) 163 #define DMAC_WRITE (MODECON_WRITE) 164 #define INIT_SBICDMA (CTRL_DMABURST) 165 166 #define scsi_xferred have_data_in 167 168 /* 169 * Size of on-board DMA buffer 170 */ 171 #define DMAC_BUFFER_SIZE 65536 172 #endif 173 174 #define STATUS_BUFFER_TO_PRINT 24 175 176 unsigned int sdtr_period = SDTR_PERIOD; 177 unsigned int sdtr_size = SDTR_SIZE; 178 179 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 180 unsigned int result); 181 static int acornscsi_reconnect_finish(AS_Host *host); 182 static void acornscsi_dma_cleanup(AS_Host *host); 183 static void acornscsi_abortcmd(AS_Host *host, unsigned char tag); 184 185 /* ==================================================================================== 186 * Miscellaneous 187 */ 188 189 /* Offsets from MEMC base */ 190 #define SBIC_REGIDX 0x2000 191 #define SBIC_REGVAL 0x2004 192 #define DMAC_OFFSET 0x3000 193 194 /* Offsets from FAST IOC base */ 195 #define INT_REG 0x2000 196 #define PAGE_REG 0x3000 197 198 static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value) 199 { 200 writeb(reg, host->base + SBIC_REGIDX); 201 writeb(value, host->base + SBIC_REGVAL); 202 } 203 204 static inline int sbic_arm_read(AS_Host *host, unsigned int reg) 205 { 206 if(reg == SBIC_ASR) 207 return readl(host->base + SBIC_REGIDX) & 255; 208 writeb(reg, host->base + SBIC_REGIDX); 209 return readl(host->base + SBIC_REGVAL) & 255; 210 } 211 212 #define sbic_arm_writenext(host, val) writeb((val), (host)->base + SBIC_REGVAL) 213 #define sbic_arm_readnext(host) readb((host)->base + SBIC_REGVAL) 214 215 #ifdef USE_DMAC 216 #define dmac_read(host,reg) \ 217 readb((host)->base + DMAC_OFFSET + ((reg) << 2)) 218 219 #define dmac_write(host,reg,value) \ 220 ({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); }) 221 222 #define dmac_clearintr(host) writeb(0, (host)->fast + INT_REG) 223 224 static inline unsigned int dmac_address(AS_Host *host) 225 { 226 return dmac_read(host, DMAC_TXADRHI) << 16 | 227 dmac_read(host, DMAC_TXADRMD) << 8 | 228 dmac_read(host, DMAC_TXADRLO); 229 } 230 231 static 232 void acornscsi_dumpdma(AS_Host *host, char *where) 233 { 234 unsigned int mode, addr, len; 235 236 mode = dmac_read(host, DMAC_MODECON); 237 addr = dmac_address(host); 238 len = dmac_read(host, DMAC_TXCNTHI) << 8 | 239 dmac_read(host, DMAC_TXCNTLO); 240 241 printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ", 242 host->host->host_no, where, 243 mode, addr, (len + 1) & 0xffff, 244 dmac_read(host, DMAC_MASKREG)); 245 246 printk("DMA @%06x, ", host->dma.start_addr); 247 printk("BH @%p +%04x, ", host->scsi.SCp.ptr, 248 host->scsi.SCp.this_residual); 249 printk("DT @+%04x ST @+%04x", host->dma.transferred, 250 host->scsi.SCp.scsi_xferred); 251 printk("\n"); 252 } 253 #endif 254 255 static 256 unsigned long acornscsi_sbic_xfcount(AS_Host *host) 257 { 258 unsigned long length; 259 260 length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16; 261 length |= sbic_arm_readnext(host) << 8; 262 length |= sbic_arm_readnext(host); 263 264 return length; 265 } 266 267 static int 268 acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg) 269 { 270 int asr; 271 272 do { 273 asr = sbic_arm_read(host, SBIC_ASR); 274 275 if ((asr & stat_mask) == stat) 276 return 0; 277 278 udelay(1); 279 } while (--timeout); 280 281 printk("scsi%d: timeout while %s\n", host->host->host_no, msg); 282 283 return -1; 284 } 285 286 static 287 int acornscsi_sbic_issuecmd(AS_Host *host, int command) 288 { 289 if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command")) 290 return -1; 291 292 sbic_arm_write(host, SBIC_CMND, command); 293 294 return 0; 295 } 296 297 static void 298 acornscsi_csdelay(unsigned int cs) 299 { 300 unsigned long target_jiffies, flags; 301 302 target_jiffies = jiffies + 1 + cs * HZ / 100; 303 304 local_save_flags(flags); 305 local_irq_enable(); 306 307 while (time_before(jiffies, target_jiffies)) barrier(); 308 309 local_irq_restore(flags); 310 } 311 312 static 313 void acornscsi_resetcard(AS_Host *host) 314 { 315 unsigned int i, timeout; 316 317 /* assert reset line */ 318 host->card.page_reg = 0x80; 319 writeb(host->card.page_reg, host->fast + PAGE_REG); 320 321 /* wait 3 cs. SCSI standard says 25ms. */ 322 acornscsi_csdelay(3); 323 324 host->card.page_reg = 0; 325 writeb(host->card.page_reg, host->fast + PAGE_REG); 326 327 /* 328 * Should get a reset from the card 329 */ 330 timeout = 1000; 331 do { 332 if (readb(host->fast + INT_REG) & 8) 333 break; 334 udelay(1); 335 } while (--timeout); 336 337 if (timeout == 0) 338 printk("scsi%d: timeout while resetting card\n", 339 host->host->host_no); 340 341 sbic_arm_read(host, SBIC_ASR); 342 sbic_arm_read(host, SBIC_SSR); 343 344 /* setup sbic - WD33C93A */ 345 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 346 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 347 348 /* 349 * Command should cause a reset interrupt 350 */ 351 timeout = 1000; 352 do { 353 if (readb(host->fast + INT_REG) & 8) 354 break; 355 udelay(1); 356 } while (--timeout); 357 358 if (timeout == 0) 359 printk("scsi%d: timeout while resetting card\n", 360 host->host->host_no); 361 362 sbic_arm_read(host, SBIC_ASR); 363 if (sbic_arm_read(host, SBIC_SSR) != 0x01) 364 printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n", 365 host->host->host_no); 366 367 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 368 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 369 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 370 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 371 372 host->card.page_reg = 0x40; 373 writeb(host->card.page_reg, host->fast + PAGE_REG); 374 375 /* setup dmac - uPC71071 */ 376 dmac_write(host, DMAC_INIT, 0); 377 #ifdef USE_DMAC 378 dmac_write(host, DMAC_INIT, INIT_8BIT); 379 dmac_write(host, DMAC_CHANNEL, CHANNEL_0); 380 dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0); 381 dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1); 382 #endif 383 384 host->SCpnt = NULL; 385 host->scsi.phase = PHASE_IDLE; 386 host->scsi.disconnectable = 0; 387 388 memset(host->busyluns, 0, sizeof(host->busyluns)); 389 390 for (i = 0; i < 8; i++) { 391 host->device[i].sync_state = SYNC_NEGOCIATE; 392 host->device[i].disconnect_ok = 1; 393 } 394 395 /* wait 25 cs. SCSI standard says 250ms. */ 396 acornscsi_csdelay(25); 397 } 398 399 /*============================================================================================= 400 * Utility routines (eg. debug) 401 */ 402 #ifdef CONFIG_ACORNSCSI_CONSTANTS 403 static char *acornscsi_interrupttype[] = { 404 "rst", "suc", "p/a", "3", 405 "term", "5", "6", "7", 406 "serv", "9", "a", "b", 407 "c", "d", "e", "f" 408 }; 409 410 static signed char acornscsi_map[] = { 411 0, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 412 -1, 2, -1, -1, -1, -1, 3, -1, 4, 5, 6, 7, 8, 9, 10, 11, 413 12, 13, 14, -1, -1, -1, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 414 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 415 15, 16, 17, 18, 19, -1, -1, 20, 4, 5, 6, 7, 8, 9, 10, 11, 416 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 417 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 418 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 419 21, 22, -1, -1, -1, 23, -1, -1, 4, 5, 6, 7, 8, 9, 10, 11, 420 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 421 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 422 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 423 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 424 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 425 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 426 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 427 }; 428 429 static char *acornscsi_interruptcode[] = { 430 /* 0 */ 431 "reset - normal mode", /* 00 */ 432 "reset - advanced mode", /* 01 */ 433 434 /* 2 */ 435 "sel", /* 11 */ 436 "sel+xfer", /* 16 */ 437 "data-out", /* 18 */ 438 "data-in", /* 19 */ 439 "cmd", /* 1A */ 440 "stat", /* 1B */ 441 "??-out", /* 1C */ 442 "??-in", /* 1D */ 443 "msg-out", /* 1E */ 444 "msg-in", /* 1F */ 445 446 /* 12 */ 447 "/ACK asserted", /* 20 */ 448 "save-data-ptr", /* 21 */ 449 "{re}sel", /* 22 */ 450 451 /* 15 */ 452 "inv cmd", /* 40 */ 453 "unexpected disconnect", /* 41 */ 454 "sel timeout", /* 42 */ 455 "P err", /* 43 */ 456 "P err+ATN", /* 44 */ 457 "bad status byte", /* 47 */ 458 459 /* 21 */ 460 "resel, no id", /* 80 */ 461 "resel", /* 81 */ 462 "discon", /* 85 */ 463 }; 464 465 static 466 void print_scsi_status(unsigned int ssr) 467 { 468 if (acornscsi_map[ssr] != -1) 469 printk("%s:%s", 470 acornscsi_interrupttype[(ssr >> 4)], 471 acornscsi_interruptcode[acornscsi_map[ssr]]); 472 else 473 printk("%X:%X", ssr >> 4, ssr & 0x0f); 474 } 475 #endif 476 477 static 478 void print_sbic_status(int asr, int ssr, int cmdphase) 479 { 480 #ifdef CONFIG_ACORNSCSI_CONSTANTS 481 printk("sbic: %c%c%c%c%c%c ", 482 asr & ASR_INT ? 'I' : 'i', 483 asr & ASR_LCI ? 'L' : 'l', 484 asr & ASR_BSY ? 'B' : 'b', 485 asr & ASR_CIP ? 'C' : 'c', 486 asr & ASR_PE ? 'P' : 'p', 487 asr & ASR_DBR ? 'D' : 'd'); 488 printk("scsi: "); 489 print_scsi_status(ssr); 490 printk(" ph %02X\n", cmdphase); 491 #else 492 printk("sbic: %02X scsi: %X:%X ph: %02X\n", 493 asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase); 494 #endif 495 } 496 497 static void 498 acornscsi_dumplogline(AS_Host *host, int target, int line) 499 { 500 unsigned long prev; 501 signed int ptr; 502 503 ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT; 504 if (ptr < 0) 505 ptr += STATUS_BUFFER_SIZE; 506 507 printk("%c: %3s:", target == 8 ? 'H' : '0' + target, 508 line == 0 ? "ph" : line == 1 ? "ssr" : "int"); 509 510 prev = host->status[target][ptr].when; 511 512 for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 513 unsigned long time_diff; 514 515 if (!host->status[target][ptr].when) 516 continue; 517 518 switch (line) { 519 case 0: 520 printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ', 521 host->status[target][ptr].ph); 522 break; 523 524 case 1: 525 printk(" %02X", host->status[target][ptr].ssr); 526 break; 527 528 case 2: 529 time_diff = host->status[target][ptr].when - prev; 530 prev = host->status[target][ptr].when; 531 if (time_diff == 0) 532 printk("==^"); 533 else if (time_diff >= 100) 534 printk(" "); 535 else 536 printk(" %02ld", time_diff); 537 break; 538 } 539 } 540 541 printk("\n"); 542 } 543 544 static 545 void acornscsi_dumplog(AS_Host *host, int target) 546 { 547 do { 548 acornscsi_dumplogline(host, target, 0); 549 acornscsi_dumplogline(host, target, 1); 550 acornscsi_dumplogline(host, target, 2); 551 552 if (target == 8) 553 break; 554 555 target = 8; 556 } while (1); 557 } 558 559 static 560 char acornscsi_target(AS_Host *host) 561 { 562 if (host->SCpnt) 563 return '0' + host->SCpnt->device->id; 564 return 'H'; 565 } 566 567 /* 568 * Prototype: cmdtype_t acornscsi_cmdtype(int command) 569 * Purpose : differentiate READ from WRITE from other commands 570 * Params : command - command to interpret 571 * Returns : CMD_READ - command reads data, 572 * CMD_WRITE - command writes data, 573 * CMD_MISC - everything else 574 */ 575 static inline 576 cmdtype_t acornscsi_cmdtype(int command) 577 { 578 switch (command) { 579 case WRITE_6: case WRITE_10: case WRITE_12: 580 return CMD_WRITE; 581 case READ_6: case READ_10: case READ_12: 582 return CMD_READ; 583 default: 584 return CMD_MISC; 585 } 586 } 587 588 /* 589 * Prototype: int acornscsi_datadirection(int command) 590 * Purpose : differentiate between commands that have a DATA IN phase 591 * and a DATA OUT phase 592 * Params : command - command to interpret 593 * Returns : DATADIR_OUT - data out phase expected 594 * DATADIR_IN - data in phase expected 595 */ 596 static 597 datadir_t acornscsi_datadirection(int command) 598 { 599 switch (command) { 600 case CHANGE_DEFINITION: case COMPARE: case COPY: 601 case COPY_VERIFY: case LOG_SELECT: case MODE_SELECT: 602 case MODE_SELECT_10: case SEND_DIAGNOSTIC: case WRITE_BUFFER: 603 case FORMAT_UNIT: case REASSIGN_BLOCKS: case RESERVE: 604 case SEARCH_EQUAL: case SEARCH_HIGH: case SEARCH_LOW: 605 case WRITE_6: case WRITE_10: case WRITE_VERIFY: 606 case UPDATE_BLOCK: case WRITE_LONG: case WRITE_SAME: 607 case SEARCH_HIGH_12: case SEARCH_EQUAL_12: case SEARCH_LOW_12: 608 case WRITE_12: case WRITE_VERIFY_12: case SET_WINDOW: 609 case MEDIUM_SCAN: case SEND_VOLUME_TAG: case 0xea: 610 return DATADIR_OUT; 611 default: 612 return DATADIR_IN; 613 } 614 } 615 616 /* 617 * Purpose : provide values for synchronous transfers with 33C93. 618 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 619 * Modified by Russell King for 8MHz WD33C93A 620 */ 621 static struct sync_xfer_tbl { 622 unsigned int period_ns; 623 unsigned char reg_value; 624 } sync_xfer_table[] = { 625 { 1, 0x20 }, { 249, 0x20 }, { 374, 0x30 }, 626 { 499, 0x40 }, { 624, 0x50 }, { 749, 0x60 }, 627 { 874, 0x70 }, { 999, 0x00 }, { 0, 0 } 628 }; 629 630 /* 631 * Prototype: int acornscsi_getperiod(unsigned char syncxfer) 632 * Purpose : period for the synchronous transfer setting 633 * Params : syncxfer SYNCXFER register value 634 * Returns : period in ns. 635 */ 636 static 637 int acornscsi_getperiod(unsigned char syncxfer) 638 { 639 int i; 640 641 syncxfer &= 0xf0; 642 if (syncxfer == 0x10) 643 syncxfer = 0; 644 645 for (i = 1; sync_xfer_table[i].period_ns; i++) 646 if (syncxfer == sync_xfer_table[i].reg_value) 647 return sync_xfer_table[i].period_ns; 648 return 0; 649 } 650 651 /* 652 * Prototype: int round_period(unsigned int period) 653 * Purpose : return index into above table for a required REQ period 654 * Params : period - time (ns) for REQ 655 * Returns : table index 656 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 657 */ 658 static inline 659 int round_period(unsigned int period) 660 { 661 int i; 662 663 for (i = 1; sync_xfer_table[i].period_ns; i++) { 664 if ((period <= sync_xfer_table[i].period_ns) && 665 (period > sync_xfer_table[i - 1].period_ns)) 666 return i; 667 } 668 return 7; 669 } 670 671 /* 672 * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 673 * Purpose : calculate value for 33c93s SYNC register 674 * Params : period - time (ns) for REQ 675 * offset - offset in bytes between REQ/ACK 676 * Returns : value for SYNC register 677 * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting 678 */ 679 static 680 unsigned char calc_sync_xfer(unsigned int period, unsigned int offset) 681 { 682 return sync_xfer_table[round_period(period)].reg_value | 683 ((offset < SDTR_SIZE) ? offset : SDTR_SIZE); 684 } 685 686 /* ==================================================================================== 687 * Command functions 688 */ 689 /* 690 * Function: acornscsi_kick(AS_Host *host) 691 * Purpose : kick next command to interface 692 * Params : host - host to send command to 693 * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING 694 * Notes : interrupts are always disabled! 695 */ 696 static 697 intr_ret_t acornscsi_kick(AS_Host *host) 698 { 699 int from_queue = 0; 700 struct scsi_cmnd *SCpnt; 701 702 /* first check to see if a command is waiting to be executed */ 703 SCpnt = host->origSCpnt; 704 host->origSCpnt = NULL; 705 706 /* retrieve next command */ 707 if (!SCpnt) { 708 SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns); 709 if (!SCpnt) 710 return INTR_IDLE; 711 712 from_queue = 1; 713 } 714 715 if (host->scsi.disconnectable && host->SCpnt) { 716 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 717 host->scsi.disconnectable = 0; 718 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 719 DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n", 720 host->host->host_no, acornscsi_target(host))); 721 #endif 722 host->SCpnt = NULL; 723 } 724 725 /* 726 * If we have an interrupt pending, then we may have been reselected. 727 * In this case, we don't want to write to the registers 728 */ 729 if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) { 730 sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id); 731 sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN); 732 } 733 734 /* 735 * claim host busy - all of these must happen atomically wrt 736 * our interrupt routine. Failure means command loss. 737 */ 738 host->scsi.phase = PHASE_CONNECTING; 739 host->SCpnt = SCpnt; 740 host->scsi.SCp = SCpnt->SCp; 741 host->dma.xfer_setup = 0; 742 host->dma.xfer_required = 0; 743 host->dma.xfer_done = 0; 744 745 #if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT)) 746 DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n", 747 host->host->host_no, '0' + SCpnt->device->id, 748 SCpnt->cmnd[0])); 749 #endif 750 751 if (from_queue) { 752 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 753 /* 754 * tagged queueing - allocate a new tag to this command 755 */ 756 if (SCpnt->device->simple_tags) { 757 SCpnt->device->current_tag += 1; 758 if (SCpnt->device->current_tag == 0) 759 SCpnt->device->current_tag = 1; 760 SCpnt->tag = SCpnt->device->current_tag; 761 } else 762 #endif 763 set_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns); 764 765 host->stats.removes += 1; 766 767 switch (acornscsi_cmdtype(SCpnt->cmnd[0])) { 768 case CMD_WRITE: 769 host->stats.writes += 1; 770 break; 771 case CMD_READ: 772 host->stats.reads += 1; 773 break; 774 case CMD_MISC: 775 host->stats.miscs += 1; 776 break; 777 } 778 } 779 780 return INTR_PROCESSING; 781 } 782 783 /* 784 * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result) 785 * Purpose : complete processing for command 786 * Params : host - interface that completed 787 * result - driver byte of result 788 */ 789 static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, 790 unsigned int result) 791 { 792 struct scsi_cmnd *SCpnt = *SCpntp; 793 794 /* clean up */ 795 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 796 797 host->stats.fins += 1; 798 799 if (SCpnt) { 800 *SCpntp = NULL; 801 802 acornscsi_dma_cleanup(host); 803 804 SCpnt->result = result << 16 | host->scsi.SCp.Message << 8 | host->scsi.SCp.Status; 805 806 /* 807 * In theory, this should not happen. In practice, it seems to. 808 * Only trigger an error if the device attempts to report all happy 809 * but with untransferred buffers... If we don't do something, then 810 * data loss will occur. Should we check SCpnt->underflow here? 811 * It doesn't appear to be set to something meaningful by the higher 812 * levels all the time. 813 */ 814 if (result == DID_OK) { 815 int xfer_warn = 0; 816 817 if (SCpnt->underflow == 0) { 818 if (host->scsi.SCp.ptr && 819 acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC) 820 xfer_warn = 1; 821 } else { 822 if (host->scsi.SCp.scsi_xferred < SCpnt->underflow || 823 host->scsi.SCp.scsi_xferred != host->dma.transferred) 824 xfer_warn = 1; 825 } 826 827 /* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6) 828 * Targets which break data transfers into multiple 829 * connections shall end each successful connection 830 * (except possibly the last) with a SAVE DATA 831 * POINTER - DISCONNECT message sequence. 832 * 833 * This makes it difficult to ensure that a transfer has 834 * completed. If we reach the end of a transfer during 835 * the command, then we can only have finished the transfer. 836 * therefore, if we seem to have some data remaining, this 837 * is not a problem. 838 */ 839 if (host->dma.xfer_done) 840 xfer_warn = 0; 841 842 if (xfer_warn) { 843 switch (status_byte(SCpnt->result)) { 844 case CHECK_CONDITION: 845 case COMMAND_TERMINATED: 846 case BUSY: 847 case QUEUE_FULL: 848 case RESERVATION_CONFLICT: 849 break; 850 851 default: 852 printk(KERN_ERR "scsi%d.H: incomplete data transfer detected: result=%08X command=", 853 host->host->host_no, SCpnt->result); 854 __scsi_print_command(SCpnt->cmnd); 855 acornscsi_dumpdma(host, "done"); 856 acornscsi_dumplog(host, SCpnt->device->id); 857 SCpnt->result &= 0xffff; 858 SCpnt->result |= DID_ERROR << 16; 859 } 860 } 861 } 862 863 if (!SCpnt->scsi_done) 864 panic("scsi%d.H: null scsi_done function in acornscsi_done", host->host->host_no); 865 866 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns); 867 868 SCpnt->scsi_done(SCpnt); 869 } else 870 printk("scsi%d: null command in acornscsi_done", host->host->host_no); 871 872 host->scsi.phase = PHASE_IDLE; 873 } 874 875 /* ==================================================================================== 876 * DMA routines 877 */ 878 /* 879 * Purpose : update SCSI Data Pointer 880 * Notes : this will only be one SG entry or less 881 */ 882 static 883 void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length) 884 { 885 SCp->ptr += length; 886 SCp->this_residual -= length; 887 888 if (SCp->this_residual == 0 && next_SCp(SCp) == 0) 889 host->dma.xfer_done = 1; 890 } 891 892 /* 893 * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr, 894 * unsigned int start_addr, unsigned int length) 895 * Purpose : read data from DMA RAM 896 * Params : host - host to transfer from 897 * ptr - DRAM address 898 * start_addr - host mem address 899 * length - number of bytes to transfer 900 * Notes : this will only be one SG entry or less 901 */ 902 static 903 void acornscsi_data_read(AS_Host *host, char *ptr, 904 unsigned int start_addr, unsigned int length) 905 { 906 extern void __acornscsi_in(void __iomem *, char *buf, int len); 907 unsigned int page, offset, len = length; 908 909 page = (start_addr >> 12); 910 offset = start_addr & ((1 << 12) - 1); 911 912 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 913 914 while (len > 0) { 915 unsigned int this_len; 916 917 if (len + offset > (1 << 12)) 918 this_len = (1 << 12) - offset; 919 else 920 this_len = len; 921 922 __acornscsi_in(host->base + (offset << 1), ptr, this_len); 923 924 offset += this_len; 925 ptr += this_len; 926 len -= this_len; 927 928 if (offset == (1 << 12)) { 929 offset = 0; 930 page ++; 931 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 932 } 933 } 934 writeb(host->card.page_reg, host->fast + PAGE_REG); 935 } 936 937 /* 938 * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr, 939 * unsigned int start_addr, unsigned int length) 940 * Purpose : write data to DMA RAM 941 * Params : host - host to transfer from 942 * ptr - DRAM address 943 * start_addr - host mem address 944 * length - number of bytes to transfer 945 * Notes : this will only be one SG entry or less 946 */ 947 static 948 void acornscsi_data_write(AS_Host *host, char *ptr, 949 unsigned int start_addr, unsigned int length) 950 { 951 extern void __acornscsi_out(void __iomem *, char *buf, int len); 952 unsigned int page, offset, len = length; 953 954 page = (start_addr >> 12); 955 offset = start_addr & ((1 << 12) - 1); 956 957 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 958 959 while (len > 0) { 960 unsigned int this_len; 961 962 if (len + offset > (1 << 12)) 963 this_len = (1 << 12) - offset; 964 else 965 this_len = len; 966 967 __acornscsi_out(host->base + (offset << 1), ptr, this_len); 968 969 offset += this_len; 970 ptr += this_len; 971 len -= this_len; 972 973 if (offset == (1 << 12)) { 974 offset = 0; 975 page ++; 976 writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG); 977 } 978 } 979 writeb(host->card.page_reg, host->fast + PAGE_REG); 980 } 981 982 /* ========================================================================================= 983 * On-board DMA routines 984 */ 985 #ifdef USE_DMAC 986 /* 987 * Prototype: void acornscsi_dmastop(AS_Host *host) 988 * Purpose : stop all DMA 989 * Params : host - host on which to stop DMA 990 * Notes : This is called when leaving DATA IN/OUT phase, 991 * or when interface is RESET 992 */ 993 static inline 994 void acornscsi_dma_stop(AS_Host *host) 995 { 996 dmac_write(host, DMAC_MASKREG, MASK_ON); 997 dmac_clearintr(host); 998 999 #if (DEBUG & DEBUG_DMA) 1000 DBG(host->SCpnt, acornscsi_dumpdma(host, "stop")); 1001 #endif 1002 } 1003 1004 /* 1005 * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1006 * Purpose : setup DMA controller for data transfer 1007 * Params : host - host to setup 1008 * direction - data transfer direction 1009 * Notes : This is called when entering DATA I/O phase, not 1010 * while we're in a DATA I/O phase 1011 */ 1012 static 1013 void acornscsi_dma_setup(AS_Host *host, dmadir_t direction) 1014 { 1015 unsigned int address, length, mode; 1016 1017 host->dma.direction = direction; 1018 1019 dmac_write(host, DMAC_MASKREG, MASK_ON); 1020 1021 if (direction == DMA_OUT) { 1022 #if (DEBUG & DEBUG_NO_WRITE) 1023 if (NO_WRITE & (1 << host->SCpnt->device->id)) { 1024 printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n", 1025 host->host->host_no, acornscsi_target(host)); 1026 return; 1027 } 1028 #endif 1029 mode = DMAC_WRITE; 1030 } else 1031 mode = DMAC_READ; 1032 1033 /* 1034 * Allocate some buffer space, limited to half the buffer size 1035 */ 1036 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1037 if (length) { 1038 host->dma.start_addr = address = host->dma.free_addr; 1039 host->dma.free_addr = (host->dma.free_addr + length) & 1040 (DMAC_BUFFER_SIZE - 1); 1041 1042 /* 1043 * Transfer data to DMA memory 1044 */ 1045 if (direction == DMA_OUT) 1046 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1047 length); 1048 1049 length -= 1; 1050 dmac_write(host, DMAC_TXCNTLO, length); 1051 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1052 dmac_write(host, DMAC_TXADRLO, address); 1053 dmac_write(host, DMAC_TXADRMD, address >> 8); 1054 dmac_write(host, DMAC_TXADRHI, 0); 1055 dmac_write(host, DMAC_MODECON, mode); 1056 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1057 1058 #if (DEBUG & DEBUG_DMA) 1059 DBG(host->SCpnt, acornscsi_dumpdma(host, "strt")); 1060 #endif 1061 host->dma.xfer_setup = 1; 1062 } 1063 } 1064 1065 /* 1066 * Function: void acornscsi_dma_cleanup(AS_Host *host) 1067 * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct 1068 * Params : host - host to finish 1069 * Notes : This is called when a command is: 1070 * terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONECT 1071 * : This must not return until all transfers are completed. 1072 */ 1073 static 1074 void acornscsi_dma_cleanup(AS_Host *host) 1075 { 1076 dmac_write(host, DMAC_MASKREG, MASK_ON); 1077 dmac_clearintr(host); 1078 1079 /* 1080 * Check for a pending transfer 1081 */ 1082 if (host->dma.xfer_required) { 1083 host->dma.xfer_required = 0; 1084 if (host->dma.direction == DMA_IN) 1085 acornscsi_data_read(host, host->dma.xfer_ptr, 1086 host->dma.xfer_start, host->dma.xfer_length); 1087 } 1088 1089 /* 1090 * Has a transfer been setup? 1091 */ 1092 if (host->dma.xfer_setup) { 1093 unsigned int transferred; 1094 1095 host->dma.xfer_setup = 0; 1096 1097 #if (DEBUG & DEBUG_DMA) 1098 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi")); 1099 #endif 1100 1101 /* 1102 * Calculate number of bytes transferred from DMA. 1103 */ 1104 transferred = dmac_address(host) - host->dma.start_addr; 1105 host->dma.transferred += transferred; 1106 1107 if (host->dma.direction == DMA_IN) 1108 acornscsi_data_read(host, host->scsi.SCp.ptr, 1109 host->dma.start_addr, transferred); 1110 1111 /* 1112 * Update SCSI pointers 1113 */ 1114 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1115 #if (DEBUG & DEBUG_DMA) 1116 DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo")); 1117 #endif 1118 } 1119 } 1120 1121 /* 1122 * Function: void acornscsi_dmacintr(AS_Host *host) 1123 * Purpose : handle interrupts from DMAC device 1124 * Params : host - host to process 1125 * Notes : If reading, we schedule the read to main memory & 1126 * allow the transfer to continue. 1127 * : If writing, we fill the onboard DMA memory from main 1128 * memory. 1129 * : Called whenever DMAC finished it's current transfer. 1130 */ 1131 static 1132 void acornscsi_dma_intr(AS_Host *host) 1133 { 1134 unsigned int address, length, transferred; 1135 1136 #if (DEBUG & DEBUG_DMA) 1137 DBG(host->SCpnt, acornscsi_dumpdma(host, "inti")); 1138 #endif 1139 1140 dmac_write(host, DMAC_MASKREG, MASK_ON); 1141 dmac_clearintr(host); 1142 1143 /* 1144 * Calculate amount transferred via DMA 1145 */ 1146 transferred = dmac_address(host) - host->dma.start_addr; 1147 host->dma.transferred += transferred; 1148 1149 /* 1150 * Schedule DMA transfer off board 1151 */ 1152 if (host->dma.direction == DMA_IN) { 1153 host->dma.xfer_start = host->dma.start_addr; 1154 host->dma.xfer_length = transferred; 1155 host->dma.xfer_ptr = host->scsi.SCp.ptr; 1156 host->dma.xfer_required = 1; 1157 } 1158 1159 acornscsi_data_updateptr(host, &host->scsi.SCp, transferred); 1160 1161 /* 1162 * Allocate some buffer space, limited to half the on-board RAM size 1163 */ 1164 length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2); 1165 if (length) { 1166 host->dma.start_addr = address = host->dma.free_addr; 1167 host->dma.free_addr = (host->dma.free_addr + length) & 1168 (DMAC_BUFFER_SIZE - 1); 1169 1170 /* 1171 * Transfer data to DMA memory 1172 */ 1173 if (host->dma.direction == DMA_OUT) 1174 acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr, 1175 length); 1176 1177 length -= 1; 1178 dmac_write(host, DMAC_TXCNTLO, length); 1179 dmac_write(host, DMAC_TXCNTHI, length >> 8); 1180 dmac_write(host, DMAC_TXADRLO, address); 1181 dmac_write(host, DMAC_TXADRMD, address >> 8); 1182 dmac_write(host, DMAC_TXADRHI, 0); 1183 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1184 1185 #if (DEBUG & DEBUG_DMA) 1186 DBG(host->SCpnt, acornscsi_dumpdma(host, "into")); 1187 #endif 1188 } else { 1189 host->dma.xfer_setup = 0; 1190 #if 0 1191 /* 1192 * If the interface still wants more, then this is an error. 1193 * We give it another byte, but we also attempt to raise an 1194 * attention condition. We continue giving one byte until 1195 * the device recognises the attention. 1196 */ 1197 if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) { 1198 acornscsi_abortcmd(host, host->SCpnt->tag); 1199 1200 dmac_write(host, DMAC_TXCNTLO, 0); 1201 dmac_write(host, DMAC_TXCNTHI, 0); 1202 dmac_write(host, DMAC_TXADRLO, 0); 1203 dmac_write(host, DMAC_TXADRMD, 0); 1204 dmac_write(host, DMAC_TXADRHI, 0); 1205 dmac_write(host, DMAC_MASKREG, MASK_OFF); 1206 } 1207 #endif 1208 } 1209 } 1210 1211 /* 1212 * Function: void acornscsi_dma_xfer(AS_Host *host) 1213 * Purpose : transfer data between AcornSCSI and memory 1214 * Params : host - host to process 1215 */ 1216 static 1217 void acornscsi_dma_xfer(AS_Host *host) 1218 { 1219 host->dma.xfer_required = 0; 1220 1221 if (host->dma.direction == DMA_IN) 1222 acornscsi_data_read(host, host->dma.xfer_ptr, 1223 host->dma.xfer_start, host->dma.xfer_length); 1224 } 1225 1226 /* 1227 * Function: void acornscsi_dma_adjust(AS_Host *host) 1228 * Purpose : adjust DMA pointers & count for bytes transferred to 1229 * SBIC but not SCSI bus. 1230 * Params : host - host to adjust DMA count for 1231 */ 1232 static 1233 void acornscsi_dma_adjust(AS_Host *host) 1234 { 1235 if (host->dma.xfer_setup) { 1236 signed long transferred; 1237 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1238 DBG(host->SCpnt, acornscsi_dumpdma(host, "adji")); 1239 #endif 1240 /* 1241 * Calculate correct DMA address - DMA is ahead of SCSI bus while 1242 * writing. 1243 * host->scsi.SCp.scsi_xferred is the number of bytes 1244 * actually transferred to/from the SCSI bus. 1245 * host->dma.transferred is the number of bytes transferred 1246 * over DMA since host->dma.start_addr was last set. 1247 * 1248 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred 1249 * - host->dma.transferred 1250 */ 1251 transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred; 1252 if (transferred < 0) 1253 printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n", 1254 host->host->host_no, acornscsi_target(host), transferred); 1255 else if (transferred == 0) 1256 host->dma.xfer_setup = 0; 1257 else { 1258 transferred += host->dma.start_addr; 1259 dmac_write(host, DMAC_TXADRLO, transferred); 1260 dmac_write(host, DMAC_TXADRMD, transferred >> 8); 1261 dmac_write(host, DMAC_TXADRHI, transferred >> 16); 1262 #if (DEBUG & (DEBUG_DMA|DEBUG_WRITE)) 1263 DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo")); 1264 #endif 1265 } 1266 } 1267 } 1268 #endif 1269 1270 /* ========================================================================================= 1271 * Data I/O 1272 */ 1273 static int 1274 acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout) 1275 { 1276 unsigned int asr, timeout = max_timeout; 1277 int my_ptr = *ptr; 1278 1279 while (my_ptr < len) { 1280 asr = sbic_arm_read(host, SBIC_ASR); 1281 1282 if (asr & ASR_DBR) { 1283 timeout = max_timeout; 1284 1285 sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]); 1286 } else if (asr & ASR_INT) 1287 break; 1288 else if (--timeout == 0) 1289 break; 1290 udelay(1); 1291 } 1292 1293 *ptr = my_ptr; 1294 1295 return (timeout == 0) ? -1 : 0; 1296 } 1297 1298 /* 1299 * Function: void acornscsi_sendcommand(AS_Host *host) 1300 * Purpose : send a command to a target 1301 * Params : host - host which is connected to target 1302 */ 1303 static void 1304 acornscsi_sendcommand(AS_Host *host) 1305 { 1306 struct scsi_cmnd *SCpnt = host->SCpnt; 1307 1308 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1309 sbic_arm_writenext(host, 0); 1310 sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command); 1311 1312 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1313 1314 if (acornscsi_write_pio(host, SCpnt->cmnd, 1315 (int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000)) 1316 printk("scsi%d: timeout while sending command\n", host->host->host_no); 1317 1318 host->scsi.phase = PHASE_COMMAND; 1319 } 1320 1321 static 1322 void acornscsi_sendmessage(AS_Host *host) 1323 { 1324 unsigned int message_length = msgqueue_msglength(&host->scsi.msgs); 1325 unsigned int msgnr; 1326 struct message *msg; 1327 1328 #if (DEBUG & DEBUG_MESSAGES) 1329 printk("scsi%d.%c: sending message ", 1330 host->host->host_no, acornscsi_target(host)); 1331 #endif 1332 1333 switch (message_length) { 1334 case 0: 1335 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1336 1337 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1"); 1338 1339 sbic_arm_write(host, SBIC_DATA, NOP); 1340 1341 host->scsi.last_message = NOP; 1342 #if (DEBUG & DEBUG_MESSAGES) 1343 printk("NOP"); 1344 #endif 1345 break; 1346 1347 case 1: 1348 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1349 msg = msgqueue_getmsg(&host->scsi.msgs, 0); 1350 1351 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2"); 1352 1353 sbic_arm_write(host, SBIC_DATA, msg->msg[0]); 1354 1355 host->scsi.last_message = msg->msg[0]; 1356 #if (DEBUG & DEBUG_MESSAGES) 1357 spi_print_msg(msg->msg); 1358 #endif 1359 break; 1360 1361 default: 1362 /* 1363 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14) 1364 * 'When a target sends this (MESSAGE_REJECT) message, it 1365 * shall change to MESSAGE IN phase and send this message 1366 * prior to requesting additional message bytes from the 1367 * initiator. This provides an interlock so that the 1368 * initiator can determine which message byte is rejected. 1369 */ 1370 sbic_arm_write(host, SBIC_TRANSCNTH, 0); 1371 sbic_arm_writenext(host, 0); 1372 sbic_arm_writenext(host, message_length); 1373 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1374 1375 msgnr = 0; 1376 while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) { 1377 unsigned int i; 1378 #if (DEBUG & DEBUG_MESSAGES) 1379 spi_print_msg(msg); 1380 #endif 1381 i = 0; 1382 if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000)) 1383 printk("scsi%d: timeout while sending message\n", host->host->host_no); 1384 1385 host->scsi.last_message = msg->msg[0]; 1386 if (msg->msg[0] == EXTENDED_MESSAGE) 1387 host->scsi.last_message |= msg->msg[2] << 8; 1388 1389 if (i != msg->length) 1390 break; 1391 } 1392 break; 1393 } 1394 #if (DEBUG & DEBUG_MESSAGES) 1395 printk("\n"); 1396 #endif 1397 } 1398 1399 /* 1400 * Function: void acornscsi_readstatusbyte(AS_Host *host) 1401 * Purpose : Read status byte from connected target 1402 * Params : host - host connected to target 1403 */ 1404 static 1405 void acornscsi_readstatusbyte(AS_Host *host) 1406 { 1407 acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT); 1408 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte"); 1409 host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA); 1410 } 1411 1412 /* 1413 * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host) 1414 * Purpose : Read one message byte from connected target 1415 * Params : host - host connected to target 1416 */ 1417 static 1418 unsigned char acornscsi_readmessagebyte(AS_Host *host) 1419 { 1420 unsigned char message; 1421 1422 acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT); 1423 1424 acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte"); 1425 1426 message = sbic_arm_read(host, SBIC_DATA); 1427 1428 /* wait for MSGIN-XFER-PAUSED */ 1429 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte"); 1430 1431 sbic_arm_read(host, SBIC_SSR); 1432 1433 return message; 1434 } 1435 1436 /* 1437 * Function: void acornscsi_message(AS_Host *host) 1438 * Purpose : Read complete message from connected target & action message 1439 * Params : host - host connected to target 1440 */ 1441 static 1442 void acornscsi_message(AS_Host *host) 1443 { 1444 unsigned char message[16]; 1445 unsigned int msgidx = 0, msglen = 1; 1446 1447 do { 1448 message[msgidx] = acornscsi_readmessagebyte(host); 1449 1450 switch (msgidx) { 1451 case 0: 1452 if (message[0] == EXTENDED_MESSAGE || 1453 (message[0] >= 0x20 && message[0] <= 0x2f)) 1454 msglen = 2; 1455 break; 1456 1457 case 1: 1458 if (message[0] == EXTENDED_MESSAGE) 1459 msglen += message[msgidx]; 1460 break; 1461 } 1462 msgidx += 1; 1463 if (msgidx < msglen) { 1464 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1465 1466 /* wait for next msg-in */ 1467 acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack"); 1468 sbic_arm_read(host, SBIC_SSR); 1469 } 1470 } while (msgidx < msglen); 1471 1472 #if (DEBUG & DEBUG_MESSAGES) 1473 printk("scsi%d.%c: message in: ", 1474 host->host->host_no, acornscsi_target(host)); 1475 spi_print_msg(message); 1476 printk("\n"); 1477 #endif 1478 1479 if (host->scsi.phase == PHASE_RECONNECTED) { 1480 /* 1481 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1482 * 'Whenever a target reconnects to an initiator to continue 1483 * a tagged I/O process, the SIMPLE QUEUE TAG message shall 1484 * be sent immediately following the IDENTIFY message...' 1485 */ 1486 if (message[0] == SIMPLE_QUEUE_TAG) 1487 host->scsi.reconnected.tag = message[1]; 1488 if (acornscsi_reconnect_finish(host)) 1489 host->scsi.phase = PHASE_MSGIN; 1490 } 1491 1492 switch (message[0]) { 1493 case ABORT: 1494 case ABORT_TAG: 1495 case COMMAND_COMPLETE: 1496 if (host->scsi.phase != PHASE_STATUSIN) { 1497 printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n", 1498 host->host->host_no, acornscsi_target(host)); 1499 acornscsi_dumplog(host, host->SCpnt->device->id); 1500 } 1501 host->scsi.phase = PHASE_DONE; 1502 host->scsi.SCp.Message = message[0]; 1503 break; 1504 1505 case SAVE_POINTERS: 1506 /* 1507 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20) 1508 * 'The SAVE DATA POINTER message is sent from a target to 1509 * direct the initiator to copy the active data pointer to 1510 * the saved data pointer for the current I/O process. 1511 */ 1512 acornscsi_dma_cleanup(host); 1513 host->SCpnt->SCp = host->scsi.SCp; 1514 host->SCpnt->SCp.sent_command = 0; 1515 host->scsi.phase = PHASE_MSGIN; 1516 break; 1517 1518 case RESTORE_POINTERS: 1519 /* 1520 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19) 1521 * 'The RESTORE POINTERS message is sent from a target to 1522 * direct the initiator to copy the most recently saved 1523 * command, data, and status pointers for the I/O process 1524 * to the corresponding active pointers. The command and 1525 * status pointers shall be restored to the beginning of 1526 * the present command and status areas.' 1527 */ 1528 acornscsi_dma_cleanup(host); 1529 host->scsi.SCp = host->SCpnt->SCp; 1530 host->scsi.phase = PHASE_MSGIN; 1531 break; 1532 1533 case DISCONNECT: 1534 /* 1535 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2) 1536 * 'On those occasions when an error or exception condition occurs 1537 * and the target elects to repeat the information transfer, the 1538 * target may repeat the transfer either issuing a RESTORE POINTERS 1539 * message or by disconnecting without issuing a SAVE POINTERS 1540 * message. When reconnection is completed, the most recent 1541 * saved pointer values are restored.' 1542 */ 1543 acornscsi_dma_cleanup(host); 1544 host->scsi.phase = PHASE_DISCONNECT; 1545 break; 1546 1547 case MESSAGE_REJECT: 1548 #if 0 /* this isn't needed any more */ 1549 /* 1550 * If we were negociating sync transfer, we don't yet know if 1551 * this REJECT is for the sync transfer or for the tagged queue/wide 1552 * transfer. Re-initiate sync transfer negotiation now, and if 1553 * we got a REJECT in response to SDTR, then it'll be set to DONE. 1554 */ 1555 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) 1556 host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE; 1557 #endif 1558 1559 /* 1560 * If we have any messages waiting to go out, then assert ATN now 1561 */ 1562 if (msgqueue_msglength(&host->scsi.msgs)) 1563 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1564 1565 switch (host->scsi.last_message) { 1566 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1567 case HEAD_OF_QUEUE_TAG: 1568 case ORDERED_QUEUE_TAG: 1569 case SIMPLE_QUEUE_TAG: 1570 /* 1571 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17) 1572 * If a target does not implement tagged queuing and a queue tag 1573 * message is received, it shall respond with a MESSAGE REJECT 1574 * message and accept the I/O process as if it were untagged. 1575 */ 1576 printk(KERN_NOTICE "scsi%d.%c: disabling tagged queueing\n", 1577 host->host->host_no, acornscsi_target(host)); 1578 host->SCpnt->device->simple_tags = 0; 1579 set_bit(host->SCpnt->device->id * 8 + host->SCpnt->device->lun, host->busyluns); 1580 break; 1581 #endif 1582 case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8): 1583 /* 1584 * Target can't handle synchronous transfers 1585 */ 1586 printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n", 1587 host->host->host_no, acornscsi_target(host)); 1588 host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA; 1589 host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS; 1590 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1591 break; 1592 1593 default: 1594 break; 1595 } 1596 break; 1597 1598 case QUEUE_FULL: 1599 /* TODO: target queue is full */ 1600 break; 1601 1602 case SIMPLE_QUEUE_TAG: 1603 /* tag queue reconnect... message[1] = queue tag. Print something to indicate something happened! */ 1604 printk("scsi%d.%c: reconnect queue tag %02X\n", 1605 host->host->host_no, acornscsi_target(host), 1606 message[1]); 1607 break; 1608 1609 case EXTENDED_MESSAGE: 1610 switch (message[2]) { 1611 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1612 case EXTENDED_SDTR: 1613 if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) { 1614 /* 1615 * We requested synchronous transfers. This isn't quite right... 1616 * We can only say if this succeeded if we proceed on to execute the 1617 * command from this message. If we get a MESSAGE PARITY ERROR, 1618 * and the target retries fail, then we fallback to asynchronous mode 1619 */ 1620 host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED; 1621 printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n", 1622 host->host->host_no, acornscsi_target(host), 1623 message[4], message[3] * 4); 1624 host->device[host->SCpnt->device->id].sync_xfer = 1625 calc_sync_xfer(message[3] * 4, message[4]); 1626 } else { 1627 unsigned char period, length; 1628 /* 1629 * Target requested synchronous transfers. The agreement is only 1630 * to be in operation AFTER the target leaves message out phase. 1631 */ 1632 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1633 period = max_t(unsigned int, message[3], sdtr_period / 4); 1634 length = min_t(unsigned int, message[4], sdtr_size); 1635 msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3, 1636 EXTENDED_SDTR, period, length); 1637 host->device[host->SCpnt->device->id].sync_xfer = 1638 calc_sync_xfer(period * 4, length); 1639 } 1640 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1641 break; 1642 #else 1643 /* We do not accept synchronous transfers. Respond with a 1644 * MESSAGE_REJECT. 1645 */ 1646 #endif 1647 1648 case EXTENDED_WDTR: 1649 /* The WD33C93A is only 8-bit. We respond with a MESSAGE_REJECT 1650 * to a wide data transfer request. 1651 */ 1652 default: 1653 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1654 msgqueue_flush(&host->scsi.msgs); 1655 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1656 break; 1657 } 1658 break; 1659 1660 default: /* reject message */ 1661 printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n", 1662 host->host->host_no, acornscsi_target(host), 1663 message[0]); 1664 acornscsi_sbic_issuecmd(host, CMND_ASSERTATN); 1665 msgqueue_flush(&host->scsi.msgs); 1666 msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT); 1667 host->scsi.phase = PHASE_MSGIN; 1668 break; 1669 } 1670 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1671 } 1672 1673 /* 1674 * Function: int acornscsi_buildmessages(AS_Host *host) 1675 * Purpose : build the connection messages for a host 1676 * Params : host - host to add messages to 1677 */ 1678 static 1679 void acornscsi_buildmessages(AS_Host *host) 1680 { 1681 #if 0 1682 /* does the device need resetting? */ 1683 if (cmd_reset) { 1684 msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET); 1685 return; 1686 } 1687 #endif 1688 1689 msgqueue_addmsg(&host->scsi.msgs, 1, 1690 IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok, 1691 host->SCpnt->device->lun)); 1692 1693 #if 0 1694 /* does the device need the current command aborted */ 1695 if (cmd_aborted) { 1696 acornscsi_abortcmd(host->SCpnt->tag); 1697 return; 1698 } 1699 #endif 1700 1701 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1702 if (host->SCpnt->tag) { 1703 unsigned int tag_type; 1704 1705 if (host->SCpnt->cmnd[0] == REQUEST_SENSE || 1706 host->SCpnt->cmnd[0] == TEST_UNIT_READY || 1707 host->SCpnt->cmnd[0] == INQUIRY) 1708 tag_type = HEAD_OF_QUEUE_TAG; 1709 else 1710 tag_type = SIMPLE_QUEUE_TAG; 1711 msgqueue_addmsg(&host->scsi.msgs, 2, tag_type, host->SCpnt->tag); 1712 } 1713 #endif 1714 1715 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 1716 if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) { 1717 host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST; 1718 msgqueue_addmsg(&host->scsi.msgs, 5, 1719 EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1720 sdtr_period / 4, sdtr_size); 1721 } 1722 #endif 1723 } 1724 1725 /* 1726 * Function: int acornscsi_starttransfer(AS_Host *host) 1727 * Purpose : transfer data to/from connected target 1728 * Params : host - host to which target is connected 1729 * Returns : 0 if failure 1730 */ 1731 static 1732 int acornscsi_starttransfer(AS_Host *host) 1733 { 1734 int residual; 1735 1736 if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) { 1737 printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n", 1738 host->host->host_no, acornscsi_target(host)); 1739 return 0; 1740 } 1741 1742 residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred; 1743 1744 sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer); 1745 sbic_arm_writenext(host, residual >> 16); 1746 sbic_arm_writenext(host, residual >> 8); 1747 sbic_arm_writenext(host, residual); 1748 acornscsi_sbic_issuecmd(host, CMND_XFERINFO); 1749 return 1; 1750 } 1751 1752 /* ========================================================================================= 1753 * Connection & Disconnection 1754 */ 1755 /* 1756 * Function : acornscsi_reconnect(AS_Host *host) 1757 * Purpose : reconnect a previously disconnected command 1758 * Params : host - host specific data 1759 * Remarks : SCSI spec says: 1760 * 'The set of active pointers is restored from the set 1761 * of saved pointers upon reconnection of the I/O process' 1762 */ 1763 static 1764 int acornscsi_reconnect(AS_Host *host) 1765 { 1766 unsigned int target, lun, ok = 0; 1767 1768 target = sbic_arm_read(host, SBIC_SOURCEID); 1769 1770 if (!(target & 8)) 1771 printk(KERN_ERR "scsi%d: invalid source id after reselection " 1772 "- device fault?\n", 1773 host->host->host_no); 1774 1775 target &= 7; 1776 1777 if (host->SCpnt && !host->scsi.disconnectable) { 1778 printk(KERN_ERR "scsi%d.%d: reconnected while command in " 1779 "progress to target %d?\n", 1780 host->host->host_no, target, host->SCpnt->device->id); 1781 host->SCpnt = NULL; 1782 } 1783 1784 lun = sbic_arm_read(host, SBIC_DATA) & 7; 1785 1786 host->scsi.reconnected.target = target; 1787 host->scsi.reconnected.lun = lun; 1788 host->scsi.reconnected.tag = 0; 1789 1790 if (host->scsi.disconnectable && host->SCpnt && 1791 host->SCpnt->device->id == target && host->SCpnt->device->lun == lun) 1792 ok = 1; 1793 1794 if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun)) 1795 ok = 1; 1796 1797 ADD_STATUS(target, 0x81, host->scsi.phase, 0); 1798 1799 if (ok) { 1800 host->scsi.phase = PHASE_RECONNECTED; 1801 } else { 1802 /* this doesn't seem to work */ 1803 printk(KERN_ERR "scsi%d.%c: reselected with no command " 1804 "to reconnect with\n", 1805 host->host->host_no, '0' + target); 1806 acornscsi_dumplog(host, target); 1807 acornscsi_abortcmd(host, 0); 1808 if (host->SCpnt) { 1809 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1810 host->SCpnt = NULL; 1811 } 1812 } 1813 acornscsi_sbic_issuecmd(host, CMND_NEGATEACK); 1814 return !ok; 1815 } 1816 1817 /* 1818 * Function: int acornscsi_reconect_finish(AS_Host *host) 1819 * Purpose : finish reconnecting a command 1820 * Params : host - host to complete 1821 * Returns : 0 if failed 1822 */ 1823 static 1824 int acornscsi_reconnect_finish(AS_Host *host) 1825 { 1826 if (host->scsi.disconnectable && host->SCpnt) { 1827 host->scsi.disconnectable = 0; 1828 if (host->SCpnt->device->id == host->scsi.reconnected.target && 1829 host->SCpnt->device->lun == host->scsi.reconnected.lun && 1830 host->SCpnt->tag == host->scsi.reconnected.tag) { 1831 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1832 DBG(host->SCpnt, printk("scsi%d.%c: reconnected", 1833 host->host->host_no, acornscsi_target(host))); 1834 #endif 1835 } else { 1836 queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt); 1837 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1838 DBG(host->SCpnt, printk("scsi%d.%c: had to move command " 1839 "to disconnected queue\n", 1840 host->host->host_no, acornscsi_target(host))); 1841 #endif 1842 host->SCpnt = NULL; 1843 } 1844 } 1845 if (!host->SCpnt) { 1846 host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected, 1847 host->scsi.reconnected.target, 1848 host->scsi.reconnected.lun, 1849 host->scsi.reconnected.tag); 1850 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1851 DBG(host->SCpnt, printk("scsi%d.%c: had to get command", 1852 host->host->host_no, acornscsi_target(host))); 1853 #endif 1854 } 1855 1856 if (!host->SCpnt) 1857 acornscsi_abortcmd(host, host->scsi.reconnected.tag); 1858 else { 1859 /* 1860 * Restore data pointer from SAVED pointers. 1861 */ 1862 host->scsi.SCp = host->SCpnt->SCp; 1863 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1864 printk(", data pointers: [%p, %X]", 1865 host->scsi.SCp.ptr, host->scsi.SCp.this_residual); 1866 #endif 1867 } 1868 #if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON)) 1869 printk("\n"); 1870 #endif 1871 1872 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1873 1874 return host->SCpnt != NULL; 1875 } 1876 1877 /* 1878 * Function: void acornscsi_disconnect_unexpected(AS_Host *host) 1879 * Purpose : handle an unexpected disconnect 1880 * Params : host - host on which disconnect occurred 1881 */ 1882 static 1883 void acornscsi_disconnect_unexpected(AS_Host *host) 1884 { 1885 printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n", 1886 host->host->host_no, acornscsi_target(host)); 1887 #if (DEBUG & DEBUG_ABORT) 1888 acornscsi_dumplog(host, 8); 1889 #endif 1890 1891 acornscsi_done(host, &host->SCpnt, DID_ERROR); 1892 } 1893 1894 /* 1895 * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag) 1896 * Purpose : abort a currently executing command 1897 * Params : host - host with connected command to abort 1898 * tag - tag to abort 1899 */ 1900 static 1901 void acornscsi_abortcmd(AS_Host *host, unsigned char tag) 1902 { 1903 host->scsi.phase = PHASE_ABORTED; 1904 sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN); 1905 1906 msgqueue_flush(&host->scsi.msgs); 1907 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 1908 if (tag) 1909 msgqueue_addmsg(&host->scsi.msgs, 2, ABORT_TAG, tag); 1910 else 1911 #endif 1912 msgqueue_addmsg(&host->scsi.msgs, 1, ABORT); 1913 } 1914 1915 /* ========================================================================================== 1916 * Interrupt routines. 1917 */ 1918 /* 1919 * Function: int acornscsi_sbicintr(AS_Host *host) 1920 * Purpose : handle interrupts from SCSI device 1921 * Params : host - host to process 1922 * Returns : INTR_PROCESS if expecting another SBIC interrupt 1923 * INTR_IDLE if no interrupt 1924 * INTR_NEXT_COMMAND if we have finished processing the command 1925 */ 1926 static 1927 intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq) 1928 { 1929 unsigned int asr, ssr; 1930 1931 asr = sbic_arm_read(host, SBIC_ASR); 1932 if (!(asr & ASR_INT)) 1933 return INTR_IDLE; 1934 1935 ssr = sbic_arm_read(host, SBIC_SSR); 1936 1937 #if (DEBUG & DEBUG_PHASES) 1938 print_sbic_status(asr, ssr, host->scsi.phase); 1939 #endif 1940 1941 ADD_STATUS(8, ssr, host->scsi.phase, in_irq); 1942 1943 if (host->SCpnt && !host->scsi.disconnectable) 1944 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 1945 1946 switch (ssr) { 1947 case 0x00: /* reset state - not advanced */ 1948 printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n", 1949 host->host->host_no); 1950 /* setup sbic - WD33C93A */ 1951 sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id); 1952 sbic_arm_write(host, SBIC_CMND, CMND_RESET); 1953 return INTR_IDLE; 1954 1955 case 0x01: /* reset state - advanced */ 1956 sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI); 1957 sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME); 1958 sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA); 1959 sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP); 1960 msgqueue_flush(&host->scsi.msgs); 1961 return INTR_IDLE; 1962 1963 case 0x41: /* unexpected disconnect aborted command */ 1964 acornscsi_disconnect_unexpected(host); 1965 return INTR_NEXT_COMMAND; 1966 } 1967 1968 switch (host->scsi.phase) { 1969 case PHASE_CONNECTING: /* STATE: command removed from issue queue */ 1970 switch (ssr) { 1971 case 0x11: /* -> PHASE_CONNECTED */ 1972 /* BUS FREE -> SELECTION */ 1973 host->scsi.phase = PHASE_CONNECTED; 1974 msgqueue_flush(&host->scsi.msgs); 1975 host->dma.transferred = host->scsi.SCp.scsi_xferred; 1976 /* 33C93 gives next interrupt indicating bus phase */ 1977 asr = sbic_arm_read(host, SBIC_ASR); 1978 if (!(asr & ASR_INT)) 1979 break; 1980 ssr = sbic_arm_read(host, SBIC_SSR); 1981 ADD_STATUS(8, ssr, host->scsi.phase, 1); 1982 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1); 1983 goto connected; 1984 1985 case 0x42: /* select timed out */ 1986 /* -> PHASE_IDLE */ 1987 acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT); 1988 return INTR_NEXT_COMMAND; 1989 1990 case 0x81: /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 1991 /* BUS FREE -> RESELECTION */ 1992 host->origSCpnt = host->SCpnt; 1993 host->SCpnt = NULL; 1994 msgqueue_flush(&host->scsi.msgs); 1995 acornscsi_reconnect(host); 1996 break; 1997 1998 default: 1999 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n", 2000 host->host->host_no, acornscsi_target(host), ssr); 2001 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2002 acornscsi_abortcmd(host, host->SCpnt->tag); 2003 } 2004 return INTR_PROCESSING; 2005 2006 connected: 2007 case PHASE_CONNECTED: /* STATE: device selected ok */ 2008 switch (ssr) { 2009 #ifdef NONSTANDARD 2010 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2011 /* SELECTION -> COMMAND */ 2012 acornscsi_sendcommand(host); 2013 break; 2014 2015 case 0x8b: /* -> PHASE_STATUS */ 2016 /* SELECTION -> STATUS */ 2017 acornscsi_readstatusbyte(host); 2018 host->scsi.phase = PHASE_STATUSIN; 2019 break; 2020 #endif 2021 2022 case 0x8e: /* -> PHASE_MSGOUT */ 2023 /* SELECTION ->MESSAGE OUT */ 2024 host->scsi.phase = PHASE_MSGOUT; 2025 acornscsi_buildmessages(host); 2026 acornscsi_sendmessage(host); 2027 break; 2028 2029 /* these should not happen */ 2030 case 0x85: /* target disconnected */ 2031 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2032 break; 2033 2034 default: 2035 printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n", 2036 host->host->host_no, acornscsi_target(host), ssr); 2037 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2038 acornscsi_abortcmd(host, host->SCpnt->tag); 2039 } 2040 return INTR_PROCESSING; 2041 2042 case PHASE_MSGOUT: /* STATE: connected & sent IDENTIFY message */ 2043 /* 2044 * SCSI standard says that MESSAGE OUT phases can be followed by a 2045 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase 2046 */ 2047 switch (ssr) { 2048 case 0x8a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2049 case 0x1a: /* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2050 /* MESSAGE OUT -> COMMAND */ 2051 acornscsi_sendcommand(host); 2052 break; 2053 2054 case 0x8b: /* -> PHASE_STATUS */ 2055 case 0x1b: /* -> PHASE_STATUS */ 2056 /* MESSAGE OUT -> STATUS */ 2057 acornscsi_readstatusbyte(host); 2058 host->scsi.phase = PHASE_STATUSIN; 2059 break; 2060 2061 case 0x8e: /* -> PHASE_MSGOUT */ 2062 /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */ 2063 acornscsi_sendmessage(host); 2064 break; 2065 2066 case 0x4f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2067 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2068 /* MESSAGE OUT -> MESSAGE IN */ 2069 acornscsi_message(host); 2070 break; 2071 2072 default: 2073 printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n", 2074 host->host->host_no, acornscsi_target(host), ssr); 2075 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2076 } 2077 return INTR_PROCESSING; 2078 2079 case PHASE_COMMAND: /* STATE: connected & command sent */ 2080 switch (ssr) { 2081 case 0x18: /* -> PHASE_DATAOUT */ 2082 /* COMMAND -> DATA OUT */ 2083 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2084 acornscsi_abortcmd(host, host->SCpnt->tag); 2085 acornscsi_dma_setup(host, DMA_OUT); 2086 if (!acornscsi_starttransfer(host)) 2087 acornscsi_abortcmd(host, host->SCpnt->tag); 2088 host->scsi.phase = PHASE_DATAOUT; 2089 return INTR_IDLE; 2090 2091 case 0x19: /* -> PHASE_DATAIN */ 2092 /* COMMAND -> DATA IN */ 2093 if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len) 2094 acornscsi_abortcmd(host, host->SCpnt->tag); 2095 acornscsi_dma_setup(host, DMA_IN); 2096 if (!acornscsi_starttransfer(host)) 2097 acornscsi_abortcmd(host, host->SCpnt->tag); 2098 host->scsi.phase = PHASE_DATAIN; 2099 return INTR_IDLE; 2100 2101 case 0x1b: /* -> PHASE_STATUS */ 2102 /* COMMAND -> STATUS */ 2103 acornscsi_readstatusbyte(host); 2104 host->scsi.phase = PHASE_STATUSIN; 2105 break; 2106 2107 case 0x1e: /* -> PHASE_MSGOUT */ 2108 /* COMMAND -> MESSAGE OUT */ 2109 acornscsi_sendmessage(host); 2110 break; 2111 2112 case 0x1f: /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2113 /* COMMAND -> MESSAGE IN */ 2114 acornscsi_message(host); 2115 break; 2116 2117 default: 2118 printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n", 2119 host->host->host_no, acornscsi_target(host), ssr); 2120 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2121 } 2122 return INTR_PROCESSING; 2123 2124 case PHASE_DISCONNECT: /* STATE: connected, received DISCONNECT msg */ 2125 if (ssr == 0x85) { /* -> PHASE_IDLE */ 2126 host->scsi.disconnectable = 1; 2127 host->scsi.reconnected.tag = 0; 2128 host->scsi.phase = PHASE_IDLE; 2129 host->stats.disconnects += 1; 2130 } else { 2131 printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n", 2132 host->host->host_no, acornscsi_target(host), ssr); 2133 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2134 } 2135 return INTR_NEXT_COMMAND; 2136 2137 case PHASE_IDLE: /* STATE: disconnected */ 2138 if (ssr == 0x81) /* -> PHASE_RECONNECTED or PHASE_ABORTED */ 2139 acornscsi_reconnect(host); 2140 else { 2141 printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\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_RECONNECTED: /* STATE: device reconnected to initiator */ 2148 /* 2149 * Command reconnected - if MESGIN, get message - it may be 2150 * the tag. If not, get command out of disconnected queue 2151 */ 2152 /* 2153 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY, 2154 * reconnect I_T_L command 2155 */ 2156 if (ssr != 0x8f && !acornscsi_reconnect_finish(host)) 2157 return INTR_IDLE; 2158 ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq); 2159 switch (ssr) { 2160 case 0x88: /* data out phase */ 2161 /* -> PHASE_DATAOUT */ 2162 /* MESSAGE IN -> DATA OUT */ 2163 acornscsi_dma_setup(host, DMA_OUT); 2164 if (!acornscsi_starttransfer(host)) 2165 acornscsi_abortcmd(host, host->SCpnt->tag); 2166 host->scsi.phase = PHASE_DATAOUT; 2167 return INTR_IDLE; 2168 2169 case 0x89: /* data in phase */ 2170 /* -> PHASE_DATAIN */ 2171 /* MESSAGE IN -> DATA IN */ 2172 acornscsi_dma_setup(host, DMA_IN); 2173 if (!acornscsi_starttransfer(host)) 2174 acornscsi_abortcmd(host, host->SCpnt->tag); 2175 host->scsi.phase = PHASE_DATAIN; 2176 return INTR_IDLE; 2177 2178 case 0x8a: /* command out */ 2179 /* MESSAGE IN -> COMMAND */ 2180 acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED */ 2181 break; 2182 2183 case 0x8b: /* status in */ 2184 /* -> PHASE_STATUSIN */ 2185 /* MESSAGE IN -> STATUS */ 2186 acornscsi_readstatusbyte(host); 2187 host->scsi.phase = PHASE_STATUSIN; 2188 break; 2189 2190 case 0x8e: /* message out */ 2191 /* -> PHASE_MSGOUT */ 2192 /* MESSAGE IN -> MESSAGE OUT */ 2193 acornscsi_sendmessage(host); 2194 break; 2195 2196 case 0x8f: /* message in */ 2197 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2198 break; 2199 2200 default: 2201 printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n", 2202 host->host->host_no, acornscsi_target(host), ssr); 2203 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2204 } 2205 return INTR_PROCESSING; 2206 2207 case PHASE_DATAIN: /* STATE: transferred data in */ 2208 /* 2209 * This is simple - if we disconnect then the DMA address & count is 2210 * correct. 2211 */ 2212 switch (ssr) { 2213 case 0x19: /* -> PHASE_DATAIN */ 2214 case 0x89: /* -> PHASE_DATAIN */ 2215 acornscsi_abortcmd(host, host->SCpnt->tag); 2216 return INTR_IDLE; 2217 2218 case 0x1b: /* -> PHASE_STATUSIN */ 2219 case 0x4b: /* -> PHASE_STATUSIN */ 2220 case 0x8b: /* -> PHASE_STATUSIN */ 2221 /* DATA IN -> STATUS */ 2222 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2223 acornscsi_sbic_xfcount(host); 2224 acornscsi_dma_stop(host); 2225 acornscsi_readstatusbyte(host); 2226 host->scsi.phase = PHASE_STATUSIN; 2227 break; 2228 2229 case 0x1e: /* -> PHASE_MSGOUT */ 2230 case 0x4e: /* -> PHASE_MSGOUT */ 2231 case 0x8e: /* -> PHASE_MSGOUT */ 2232 /* DATA IN -> MESSAGE OUT */ 2233 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2234 acornscsi_sbic_xfcount(host); 2235 acornscsi_dma_stop(host); 2236 acornscsi_sendmessage(host); 2237 break; 2238 2239 case 0x1f: /* message in */ 2240 case 0x4f: /* message in */ 2241 case 0x8f: /* message in */ 2242 /* DATA IN -> MESSAGE IN */ 2243 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2244 acornscsi_sbic_xfcount(host); 2245 acornscsi_dma_stop(host); 2246 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2247 break; 2248 2249 default: 2250 printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n", 2251 host->host->host_no, acornscsi_target(host), ssr); 2252 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2253 } 2254 return INTR_PROCESSING; 2255 2256 case PHASE_DATAOUT: /* STATE: transferred data out */ 2257 /* 2258 * This is more complicated - if we disconnect, the DMA could be 12 2259 * bytes ahead of us. We need to correct this. 2260 */ 2261 switch (ssr) { 2262 case 0x18: /* -> PHASE_DATAOUT */ 2263 case 0x88: /* -> PHASE_DATAOUT */ 2264 acornscsi_abortcmd(host, host->SCpnt->tag); 2265 return INTR_IDLE; 2266 2267 case 0x1b: /* -> PHASE_STATUSIN */ 2268 case 0x4b: /* -> PHASE_STATUSIN */ 2269 case 0x8b: /* -> PHASE_STATUSIN */ 2270 /* DATA OUT -> STATUS */ 2271 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2272 acornscsi_sbic_xfcount(host); 2273 acornscsi_dma_stop(host); 2274 acornscsi_dma_adjust(host); 2275 acornscsi_readstatusbyte(host); 2276 host->scsi.phase = PHASE_STATUSIN; 2277 break; 2278 2279 case 0x1e: /* -> PHASE_MSGOUT */ 2280 case 0x4e: /* -> PHASE_MSGOUT */ 2281 case 0x8e: /* -> PHASE_MSGOUT */ 2282 /* DATA OUT -> MESSAGE OUT */ 2283 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2284 acornscsi_sbic_xfcount(host); 2285 acornscsi_dma_stop(host); 2286 acornscsi_dma_adjust(host); 2287 acornscsi_sendmessage(host); 2288 break; 2289 2290 case 0x1f: /* message in */ 2291 case 0x4f: /* message in */ 2292 case 0x8f: /* message in */ 2293 /* DATA OUT -> MESSAGE IN */ 2294 host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) - 2295 acornscsi_sbic_xfcount(host); 2296 acornscsi_dma_stop(host); 2297 acornscsi_dma_adjust(host); 2298 acornscsi_message(host); /* -> PHASE_MSGIN, PHASE_DISCONNECT */ 2299 break; 2300 2301 default: 2302 printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n", 2303 host->host->host_no, acornscsi_target(host), ssr); 2304 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2305 } 2306 return INTR_PROCESSING; 2307 2308 case PHASE_STATUSIN: /* STATE: status in complete */ 2309 switch (ssr) { 2310 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2311 case 0x8f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2312 /* STATUS -> MESSAGE IN */ 2313 acornscsi_message(host); 2314 break; 2315 2316 case 0x1e: /* -> PHASE_MSGOUT */ 2317 case 0x8e: /* -> PHASE_MSGOUT */ 2318 /* STATUS -> MESSAGE OUT */ 2319 acornscsi_sendmessage(host); 2320 break; 2321 2322 default: 2323 printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n", 2324 host->host->host_no, acornscsi_target(host), ssr); 2325 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2326 } 2327 return INTR_PROCESSING; 2328 2329 case PHASE_MSGIN: /* STATE: message in */ 2330 switch (ssr) { 2331 case 0x1e: /* -> PHASE_MSGOUT */ 2332 case 0x4e: /* -> PHASE_MSGOUT */ 2333 case 0x8e: /* -> PHASE_MSGOUT */ 2334 /* MESSAGE IN -> MESSAGE OUT */ 2335 acornscsi_sendmessage(host); 2336 break; 2337 2338 case 0x1f: /* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */ 2339 case 0x2f: 2340 case 0x4f: 2341 case 0x8f: 2342 acornscsi_message(host); 2343 break; 2344 2345 case 0x85: 2346 printk("scsi%d.%c: strange message in disconnection\n", 2347 host->host->host_no, acornscsi_target(host)); 2348 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2349 acornscsi_done(host, &host->SCpnt, DID_ERROR); 2350 break; 2351 2352 default: 2353 printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n", 2354 host->host->host_no, acornscsi_target(host), ssr); 2355 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2356 } 2357 return INTR_PROCESSING; 2358 2359 case PHASE_DONE: /* STATE: received status & message */ 2360 switch (ssr) { 2361 case 0x85: /* -> PHASE_IDLE */ 2362 acornscsi_done(host, &host->SCpnt, DID_OK); 2363 return INTR_NEXT_COMMAND; 2364 2365 case 0x1e: 2366 case 0x8e: 2367 acornscsi_sendmessage(host); 2368 break; 2369 2370 default: 2371 printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n", 2372 host->host->host_no, acornscsi_target(host), ssr); 2373 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2374 } 2375 return INTR_PROCESSING; 2376 2377 case PHASE_ABORTED: 2378 switch (ssr) { 2379 case 0x85: 2380 if (host->SCpnt) 2381 acornscsi_done(host, &host->SCpnt, DID_ABORT); 2382 else { 2383 clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun, 2384 host->busyluns); 2385 host->scsi.phase = PHASE_IDLE; 2386 } 2387 return INTR_NEXT_COMMAND; 2388 2389 case 0x1e: 2390 case 0x2e: 2391 case 0x4e: 2392 case 0x8e: 2393 acornscsi_sendmessage(host); 2394 break; 2395 2396 default: 2397 printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n", 2398 host->host->host_no, acornscsi_target(host), ssr); 2399 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2400 } 2401 return INTR_PROCESSING; 2402 2403 default: 2404 printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n", 2405 host->host->host_no, acornscsi_target(host), ssr); 2406 acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8); 2407 } 2408 return INTR_PROCESSING; 2409 } 2410 2411 /* 2412 * Prototype: void acornscsi_intr(int irq, void *dev_id) 2413 * Purpose : handle interrupts from Acorn SCSI card 2414 * Params : irq - interrupt number 2415 * dev_id - device specific data (AS_Host structure) 2416 */ 2417 static irqreturn_t 2418 acornscsi_intr(int irq, void *dev_id) 2419 { 2420 AS_Host *host = (AS_Host *)dev_id; 2421 intr_ret_t ret; 2422 int iostatus; 2423 int in_irq = 0; 2424 2425 do { 2426 ret = INTR_IDLE; 2427 2428 iostatus = readb(host->fast + INT_REG); 2429 2430 if (iostatus & 2) { 2431 acornscsi_dma_intr(host); 2432 iostatus = readb(host->fast + INT_REG); 2433 } 2434 2435 if (iostatus & 8) 2436 ret = acornscsi_sbicintr(host, in_irq); 2437 2438 /* 2439 * If we have a transfer pending, start it. 2440 * Only start it if the interface has already started transferring 2441 * it's data 2442 */ 2443 if (host->dma.xfer_required) 2444 acornscsi_dma_xfer(host); 2445 2446 if (ret == INTR_NEXT_COMMAND) 2447 ret = acornscsi_kick(host); 2448 2449 in_irq = 1; 2450 } while (ret != INTR_IDLE); 2451 2452 return IRQ_HANDLED; 2453 } 2454 2455 /*============================================================================================= 2456 * Interfaces between interrupt handler and rest of scsi code 2457 */ 2458 2459 /* 2460 * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)) 2461 * Purpose : queues a SCSI command 2462 * Params : cmd - SCSI command 2463 * done - function called on completion, with pointer to command descriptor 2464 * Returns : 0, or < 0 on error. 2465 */ 2466 static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt, 2467 void (*done)(struct scsi_cmnd *)) 2468 { 2469 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2470 2471 if (!done) { 2472 /* there should be some way of rejecting errors like this without panicing... */ 2473 panic("scsi%d: queuecommand called with NULL done function [cmd=%p]", 2474 host->host->host_no, SCpnt); 2475 return -EINVAL; 2476 } 2477 2478 #if (DEBUG & DEBUG_NO_WRITE) 2479 if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) { 2480 printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n", 2481 host->host->host_no, '0' + SCpnt->device->id); 2482 SCpnt->result = DID_NO_CONNECT << 16; 2483 done(SCpnt); 2484 return 0; 2485 } 2486 #endif 2487 2488 SCpnt->scsi_done = done; 2489 SCpnt->host_scribble = NULL; 2490 SCpnt->result = 0; 2491 SCpnt->tag = 0; 2492 SCpnt->SCp.phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]); 2493 SCpnt->SCp.sent_command = 0; 2494 SCpnt->SCp.scsi_xferred = 0; 2495 2496 init_SCp(SCpnt); 2497 2498 host->stats.queues += 1; 2499 2500 { 2501 unsigned long flags; 2502 2503 if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) { 2504 SCpnt->result = DID_ERROR << 16; 2505 done(SCpnt); 2506 return 0; 2507 } 2508 local_irq_save(flags); 2509 if (host->scsi.phase == PHASE_IDLE) 2510 acornscsi_kick(host); 2511 local_irq_restore(flags); 2512 } 2513 return 0; 2514 } 2515 2516 DEF_SCSI_QCMD(acornscsi_queuecmd) 2517 2518 /* 2519 * Prototype: void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, struct scsi_cmnd **SCpntp2, int result) 2520 * Purpose : pass a result to *SCpntp1, and check if *SCpntp1 = *SCpntp2 2521 * Params : SCpntp1 - pointer to command to return 2522 * SCpntp2 - pointer to command to check 2523 * result - result to pass back to mid-level done function 2524 * Returns : *SCpntp2 = NULL if *SCpntp1 is the same command structure as *SCpntp2. 2525 */ 2526 static inline void acornscsi_reportstatus(struct scsi_cmnd **SCpntp1, 2527 struct scsi_cmnd **SCpntp2, 2528 int result) 2529 { 2530 struct scsi_cmnd *SCpnt = *SCpntp1; 2531 2532 if (SCpnt) { 2533 *SCpntp1 = NULL; 2534 2535 SCpnt->result = result; 2536 SCpnt->scsi_done(SCpnt); 2537 } 2538 2539 if (SCpnt == *SCpntp2) 2540 *SCpntp2 = NULL; 2541 } 2542 2543 enum res_abort { res_not_running, res_success, res_success_clear, res_snooze }; 2544 2545 /* 2546 * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt) 2547 * Purpose : abort a command on this host 2548 * Params : SCpnt - command to abort 2549 * Returns : our abort status 2550 */ 2551 static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt) 2552 { 2553 enum res_abort res = res_not_running; 2554 2555 if (queue_remove_cmd(&host->queues.issue, SCpnt)) { 2556 /* 2557 * The command was on the issue queue, and has not been 2558 * issued yet. We can remove the command from the queue, 2559 * and acknowledge the abort. Neither the devices nor the 2560 * interface know about the command. 2561 */ 2562 //#if (DEBUG & DEBUG_ABORT) 2563 printk("on issue queue "); 2564 //#endif 2565 res = res_success; 2566 } else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) { 2567 /* 2568 * The command was on the disconnected queue. Simply 2569 * acknowledge the abort condition, and when the target 2570 * reconnects, we will give it an ABORT message. The 2571 * target should then disconnect, and we will clear 2572 * the busylun bit. 2573 */ 2574 //#if (DEBUG & DEBUG_ABORT) 2575 printk("on disconnected queue "); 2576 //#endif 2577 res = res_success; 2578 } else if (host->SCpnt == SCpnt) { 2579 unsigned long flags; 2580 2581 //#if (DEBUG & DEBUG_ABORT) 2582 printk("executing "); 2583 //#endif 2584 2585 local_irq_save(flags); 2586 switch (host->scsi.phase) { 2587 /* 2588 * If the interface is idle, and the command is 'disconnectable', 2589 * then it is the same as on the disconnected queue. We simply 2590 * remove all traces of the command. When the target reconnects, 2591 * we will give it an ABORT message since the command could not 2592 * be found. When the target finally disconnects, we will clear 2593 * the busylun bit. 2594 */ 2595 case PHASE_IDLE: 2596 if (host->scsi.disconnectable) { 2597 host->scsi.disconnectable = 0; 2598 host->SCpnt = NULL; 2599 res = res_success; 2600 } 2601 break; 2602 2603 /* 2604 * If the command has connected and done nothing further, 2605 * simply force a disconnect. We also need to clear the 2606 * busylun bit. 2607 */ 2608 case PHASE_CONNECTED: 2609 sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT); 2610 host->SCpnt = NULL; 2611 res = res_success_clear; 2612 break; 2613 2614 default: 2615 acornscsi_abortcmd(host, host->SCpnt->tag); 2616 res = res_snooze; 2617 } 2618 local_irq_restore(flags); 2619 } else if (host->origSCpnt == SCpnt) { 2620 /* 2621 * The command will be executed next, but a command 2622 * is currently using the interface. This is similar to 2623 * being on the issue queue, except the busylun bit has 2624 * been set. 2625 */ 2626 host->origSCpnt = NULL; 2627 //#if (DEBUG & DEBUG_ABORT) 2628 printk("waiting for execution "); 2629 //#endif 2630 res = res_success_clear; 2631 } else 2632 printk("unknown "); 2633 2634 return res; 2635 } 2636 2637 /* 2638 * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt) 2639 * Purpose : abort a command on this host 2640 * Params : SCpnt - command to abort 2641 * Returns : one of SCSI_ABORT_ macros 2642 */ 2643 int acornscsi_abort(struct scsi_cmnd *SCpnt) 2644 { 2645 AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata; 2646 int result; 2647 2648 host->stats.aborts += 1; 2649 2650 #if (DEBUG & DEBUG_ABORT) 2651 { 2652 int asr, ssr; 2653 asr = sbic_arm_read(host, SBIC_ASR); 2654 ssr = sbic_arm_read(host, SBIC_SSR); 2655 2656 printk(KERN_WARNING "acornscsi_abort: "); 2657 print_sbic_status(asr, ssr, host->scsi.phase); 2658 acornscsi_dumplog(host, SCpnt->device->id); 2659 } 2660 #endif 2661 2662 printk("scsi%d: ", host->host->host_no); 2663 2664 switch (acornscsi_do_abort(host, SCpnt)) { 2665 /* 2666 * We managed to find the command and cleared it out. 2667 * We do not expect the command to be executing on the 2668 * target, but we have set the busylun bit. 2669 */ 2670 case res_success_clear: 2671 //#if (DEBUG & DEBUG_ABORT) 2672 printk("clear "); 2673 //#endif 2674 clear_bit(SCpnt->device->id * 8 + SCpnt->device->lun, host->busyluns); 2675 2676 /* 2677 * We found the command, and cleared it out. Either 2678 * the command is still known to be executing on the 2679 * target, or the busylun bit is not set. 2680 */ 2681 case res_success: 2682 //#if (DEBUG & DEBUG_ABORT) 2683 printk("success\n"); 2684 //#endif 2685 result = SUCCESS; 2686 break; 2687 2688 /* 2689 * We did find the command, but unfortunately we couldn't 2690 * unhook it from ourselves. Wait some more, and if it 2691 * still doesn't complete, reset the interface. 2692 */ 2693 case res_snooze: 2694 //#if (DEBUG & DEBUG_ABORT) 2695 printk("snooze\n"); 2696 //#endif 2697 result = FAILED; 2698 break; 2699 2700 /* 2701 * The command could not be found (either because it completed, 2702 * or it got dropped. 2703 */ 2704 default: 2705 case res_not_running: 2706 acornscsi_dumplog(host, SCpnt->device->id); 2707 result = FAILED; 2708 //#if (DEBUG & DEBUG_ABORT) 2709 printk("not running\n"); 2710 //#endif 2711 break; 2712 } 2713 2714 return result; 2715 } 2716 2717 /* 2718 * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt) 2719 * Purpose : reset a command on this host/reset this host 2720 * Params : SCpnt - command causing reset 2721 * Returns : one of SCSI_RESET_ macros 2722 */ 2723 int acornscsi_bus_reset(struct scsi_cmnd *SCpnt) 2724 { 2725 AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata; 2726 struct scsi_cmnd *SCptr; 2727 2728 host->stats.resets += 1; 2729 2730 #if (DEBUG & DEBUG_RESET) 2731 { 2732 int asr, ssr; 2733 2734 asr = sbic_arm_read(host, SBIC_ASR); 2735 ssr = sbic_arm_read(host, SBIC_SSR); 2736 2737 printk(KERN_WARNING "acornscsi_reset: "); 2738 print_sbic_status(asr, ssr, host->scsi.phase); 2739 acornscsi_dumplog(host, SCpnt->device->id); 2740 } 2741 #endif 2742 2743 acornscsi_dma_stop(host); 2744 2745 /* 2746 * do hard reset. This resets all devices on this host, and so we 2747 * must set the reset status on all commands. 2748 */ 2749 acornscsi_resetcard(host); 2750 2751 while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL) 2752 ; 2753 2754 return SUCCESS; 2755 } 2756 2757 /*============================================================================================== 2758 * initialisation & miscellaneous support 2759 */ 2760 2761 /* 2762 * Function: char *acornscsi_info(struct Scsi_Host *host) 2763 * Purpose : return a string describing this interface 2764 * Params : host - host to give information on 2765 * Returns : a constant string 2766 */ 2767 const 2768 char *acornscsi_info(struct Scsi_Host *host) 2769 { 2770 static char string[100], *p; 2771 2772 p = string; 2773 2774 p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d" 2775 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2776 " SYNC" 2777 #endif 2778 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2779 " TAG" 2780 #endif 2781 #if (DEBUG & DEBUG_NO_WRITE) 2782 " NOWRITE (" __stringify(NO_WRITE) ")" 2783 #endif 2784 , host->hostt->name, host->io_port, host->irq, 2785 VER_MAJOR, VER_MINOR, VER_PATCH); 2786 return string; 2787 } 2788 2789 static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance) 2790 { 2791 int devidx; 2792 struct scsi_device *scd; 2793 AS_Host *host; 2794 2795 host = (AS_Host *)instance->hostdata; 2796 2797 seq_printf(m, "AcornSCSI driver v%d.%d.%d" 2798 #ifdef CONFIG_SCSI_ACORNSCSI_SYNC 2799 " SYNC" 2800 #endif 2801 #ifdef CONFIG_SCSI_ACORNSCSI_TAGGED_QUEUE 2802 " TAG" 2803 #endif 2804 #if (DEBUG & DEBUG_NO_WRITE) 2805 " NOWRITE (" __stringify(NO_WRITE) ")" 2806 #endif 2807 "\n\n", VER_MAJOR, VER_MINOR, VER_PATCH); 2808 2809 seq_printf(m, "SBIC: WD33C93A Address: %p IRQ : %d\n", 2810 host->base + SBIC_REGIDX, host->scsi.irq); 2811 #ifdef USE_DMAC 2812 seq_printf(m, "DMAC: uPC71071 Address: %p IRQ : %d\n\n", 2813 host->base + DMAC_OFFSET, host->scsi.irq); 2814 #endif 2815 2816 seq_printf(m, "Statistics:\n" 2817 "Queued commands: %-10u Issued commands: %-10u\n" 2818 "Done commands : %-10u Reads : %-10u\n" 2819 "Writes : %-10u Others : %-10u\n" 2820 "Disconnects : %-10u Aborts : %-10u\n" 2821 "Resets : %-10u\n\nLast phases:", 2822 host->stats.queues, host->stats.removes, 2823 host->stats.fins, host->stats.reads, 2824 host->stats.writes, host->stats.miscs, 2825 host->stats.disconnects, host->stats.aborts, 2826 host->stats.resets); 2827 2828 for (devidx = 0; devidx < 9; devidx ++) { 2829 unsigned int statptr, prev; 2830 2831 seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx)); 2832 statptr = host->status_ptr[devidx] - 10; 2833 2834 if ((signed int)statptr < 0) 2835 statptr += STATUS_BUFFER_SIZE; 2836 2837 prev = host->status[devidx][statptr].when; 2838 2839 for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) { 2840 if (host->status[devidx][statptr].when) { 2841 seq_printf(m, "%c%02X:%02X+%2ld", 2842 host->status[devidx][statptr].irq ? '-' : ' ', 2843 host->status[devidx][statptr].ph, 2844 host->status[devidx][statptr].ssr, 2845 (host->status[devidx][statptr].when - prev) < 100 ? 2846 (host->status[devidx][statptr].when - prev) : 99); 2847 prev = host->status[devidx][statptr].when; 2848 } 2849 } 2850 } 2851 2852 seq_printf(m, "\nAttached devices:\n"); 2853 2854 shost_for_each_device(scd, instance) { 2855 seq_printf(m, "Device/Lun TaggedQ Sync\n"); 2856 seq_printf(m, " %d/%d ", scd->id, scd->lun); 2857 if (scd->tagged_supported) 2858 seq_printf(m, "%3sabled(%3d) ", 2859 scd->simple_tags ? "en" : "dis", 2860 scd->current_tag); 2861 else 2862 seq_printf(m, "unsupported "); 2863 2864 if (host->device[scd->id].sync_xfer & 15) 2865 seq_printf(m, "offset %d, %d ns\n", 2866 host->device[scd->id].sync_xfer & 15, 2867 acornscsi_getperiod(host->device[scd->id].sync_xfer)); 2868 else 2869 seq_printf(m, "async\n"); 2870 2871 } 2872 return 0; 2873 } 2874 2875 static struct scsi_host_template acornscsi_template = { 2876 .module = THIS_MODULE, 2877 .show_info = acornscsi_show_info, 2878 .name = "AcornSCSI", 2879 .info = acornscsi_info, 2880 .queuecommand = acornscsi_queuecmd, 2881 .eh_abort_handler = acornscsi_abort, 2882 .eh_bus_reset_handler = acornscsi_bus_reset, 2883 .can_queue = 16, 2884 .this_id = 7, 2885 .sg_tablesize = SG_ALL, 2886 .cmd_per_lun = 2, 2887 .use_clustering = DISABLE_CLUSTERING, 2888 .proc_name = "acornscsi", 2889 }; 2890 2891 static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id) 2892 { 2893 struct Scsi_Host *host; 2894 AS_Host *ashost; 2895 int ret; 2896 2897 ret = ecard_request_resources(ec); 2898 if (ret) 2899 goto out; 2900 2901 host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host)); 2902 if (!host) { 2903 ret = -ENOMEM; 2904 goto out_release; 2905 } 2906 2907 ashost = (AS_Host *)host->hostdata; 2908 2909 ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 2910 ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 2911 if (!ashost->base || !ashost->fast) 2912 goto out_put; 2913 2914 host->irq = ec->irq; 2915 ashost->host = host; 2916 ashost->scsi.irq = host->irq; 2917 2918 ec->irqaddr = ashost->fast + INT_REG; 2919 ec->irqmask = 0x0a; 2920 2921 ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost); 2922 if (ret) { 2923 printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n", 2924 host->host_no, ashost->scsi.irq, ret); 2925 goto out_put; 2926 } 2927 2928 memset(&ashost->stats, 0, sizeof (ashost->stats)); 2929 queue_initialise(&ashost->queues.issue); 2930 queue_initialise(&ashost->queues.disconnected); 2931 msgqueue_initialise(&ashost->scsi.msgs); 2932 2933 acornscsi_resetcard(ashost); 2934 2935 ret = scsi_add_host(host, &ec->dev); 2936 if (ret) 2937 goto out_irq; 2938 2939 scsi_scan_host(host); 2940 goto out; 2941 2942 out_irq: 2943 free_irq(host->irq, ashost); 2944 msgqueue_free(&ashost->scsi.msgs); 2945 queue_free(&ashost->queues.disconnected); 2946 queue_free(&ashost->queues.issue); 2947 out_put: 2948 ecardm_iounmap(ec, ashost->fast); 2949 ecardm_iounmap(ec, ashost->base); 2950 scsi_host_put(host); 2951 out_release: 2952 ecard_release_resources(ec); 2953 out: 2954 return ret; 2955 } 2956 2957 static void acornscsi_remove(struct expansion_card *ec) 2958 { 2959 struct Scsi_Host *host = ecard_get_drvdata(ec); 2960 AS_Host *ashost = (AS_Host *)host->hostdata; 2961 2962 ecard_set_drvdata(ec, NULL); 2963 scsi_remove_host(host); 2964 2965 /* 2966 * Put card into RESET state 2967 */ 2968 writeb(0x80, ashost->fast + PAGE_REG); 2969 2970 free_irq(host->irq, ashost); 2971 2972 msgqueue_free(&ashost->scsi.msgs); 2973 queue_free(&ashost->queues.disconnected); 2974 queue_free(&ashost->queues.issue); 2975 ecardm_iounmap(ec, ashost->fast); 2976 ecardm_iounmap(ec, ashost->base); 2977 scsi_host_put(host); 2978 ecard_release_resources(ec); 2979 } 2980 2981 static const struct ecard_id acornscsi_cids[] = { 2982 { MANU_ACORN, PROD_ACORN_SCSI }, 2983 { 0xffff, 0xffff }, 2984 }; 2985 2986 static struct ecard_driver acornscsi_driver = { 2987 .probe = acornscsi_probe, 2988 .remove = acornscsi_remove, 2989 .id_table = acornscsi_cids, 2990 .drv = { 2991 .name = "acornscsi", 2992 }, 2993 }; 2994 2995 static int __init acornscsi_init(void) 2996 { 2997 return ecard_register_driver(&acornscsi_driver); 2998 } 2999 3000 static void __exit acornscsi_exit(void) 3001 { 3002 ecard_remove_driver(&acornscsi_driver); 3003 } 3004 3005 module_init(acornscsi_init); 3006 module_exit(acornscsi_exit); 3007 3008 MODULE_AUTHOR("Russell King"); 3009 MODULE_DESCRIPTION("AcornSCSI driver"); 3010 MODULE_LICENSE("GPL"); 3011