Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* NCR53C9x.c: Generic SCSI driver code for NCR53C9x chips. |
| 2 | * |
| 3 | * Originally esp.c : EnhancedScsiProcessor Sun SCSI driver code. |
| 4 | * |
| 5 | * Copyright (C) 1995, 1998 David S. Miller (davem@caip.rutgers.edu) |
| 6 | * |
| 7 | * Most DMA dependencies put in driver specific files by |
| 8 | * Jesper Skov (jskov@cygnus.co.uk) |
| 9 | * |
| 10 | * Set up to use esp_read/esp_write (preprocessor macros in NCR53c9x.h) by |
| 11 | * Tymm Twillman (tymm@coe.missouri.edu) |
| 12 | */ |
| 13 | |
| 14 | /* TODO: |
| 15 | * |
| 16 | * 1) Maybe disable parity checking in config register one for SCSI1 |
| 17 | * targets. (Gilmore says parity error on the SBus can lock up |
| 18 | * old sun4c's) |
| 19 | * 2) Add support for DMA2 pipelining. |
| 20 | * 3) Add tagged queueing. |
| 21 | * 4) Maybe change use of "esp" to something more "NCR"'ish. |
| 22 | */ |
| 23 | |
| 24 | #include <linux/module.h> |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/kernel.h> |
| 27 | #include <linux/delay.h> |
| 28 | #include <linux/types.h> |
| 29 | #include <linux/string.h> |
| 30 | #include <linux/slab.h> |
| 31 | #include <linux/blkdev.h> |
| 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/proc_fs.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/init.h> |
| 36 | |
| 37 | #include "scsi.h" |
| 38 | #include <scsi/scsi_host.h> |
| 39 | #include "NCR53C9x.h" |
| 40 | |
| 41 | #include <asm/system.h> |
| 42 | #include <asm/ptrace.h> |
| 43 | #include <asm/pgtable.h> |
| 44 | #include <asm/io.h> |
| 45 | #include <asm/irq.h> |
| 46 | |
| 47 | /* Command phase enumeration. */ |
| 48 | enum { |
| 49 | not_issued = 0x00, /* Still in the issue_SC queue. */ |
| 50 | |
| 51 | /* Various forms of selecting a target. */ |
| 52 | #define in_slct_mask 0x10 |
| 53 | in_slct_norm = 0x10, /* ESP is arbitrating, normal selection */ |
| 54 | in_slct_stop = 0x11, /* ESP will select, then stop with IRQ */ |
| 55 | in_slct_msg = 0x12, /* select, then send a message */ |
| 56 | in_slct_tag = 0x13, /* select and send tagged queue msg */ |
| 57 | in_slct_sneg = 0x14, /* select and acquire sync capabilities */ |
| 58 | |
| 59 | /* Any post selection activity. */ |
| 60 | #define in_phases_mask 0x20 |
| 61 | in_datain = 0x20, /* Data is transferring from the bus */ |
| 62 | in_dataout = 0x21, /* Data is transferring to the bus */ |
| 63 | in_data_done = 0x22, /* Last DMA data operation done (maybe) */ |
| 64 | in_msgin = 0x23, /* Eating message from target */ |
| 65 | in_msgincont = 0x24, /* Eating more msg bytes from target */ |
| 66 | in_msgindone = 0x25, /* Decide what to do with what we got */ |
| 67 | in_msgout = 0x26, /* Sending message to target */ |
| 68 | in_msgoutdone = 0x27, /* Done sending msg out */ |
| 69 | in_cmdbegin = 0x28, /* Sending cmd after abnormal selection */ |
| 70 | in_cmdend = 0x29, /* Done sending slow cmd */ |
| 71 | in_status = 0x2a, /* Was in status phase, finishing cmd */ |
| 72 | in_freeing = 0x2b, /* freeing the bus for cmd cmplt or disc */ |
| 73 | in_the_dark = 0x2c, /* Don't know what bus phase we are in */ |
| 74 | |
| 75 | /* Special states, ie. not normal bus transitions... */ |
| 76 | #define in_spec_mask 0x80 |
| 77 | in_abortone = 0x80, /* Aborting one command currently */ |
| 78 | in_abortall = 0x81, /* Blowing away all commands we have */ |
| 79 | in_resetdev = 0x82, /* SCSI target reset in progress */ |
| 80 | in_resetbus = 0x83, /* SCSI bus reset in progress */ |
| 81 | in_tgterror = 0x84, /* Target did something stupid */ |
| 82 | }; |
| 83 | |
| 84 | enum { |
| 85 | /* Zero has special meaning, see skipahead[12]. */ |
| 86 | /*0*/ do_never, |
| 87 | |
| 88 | /*1*/ do_phase_determine, |
| 89 | /*2*/ do_reset_bus, |
| 90 | /*3*/ do_reset_complete, |
| 91 | /*4*/ do_work_bus, |
| 92 | /*5*/ do_intr_end |
| 93 | }; |
| 94 | |
| 95 | /* The master ring of all esp hosts we are managing in this driver. */ |
Adrian Bunk | 7dfaa5f | 2005-04-24 02:34:29 -0500 | [diff] [blame] | 96 | static struct NCR_ESP *espchain; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | int nesps = 0, esps_in_use = 0, esps_running = 0; |
| 98 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 99 | irqreturn_t esp_intr(int irq, void *dev_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | /* Debugging routines */ |
| 102 | static struct esp_cmdstrings { |
| 103 | unchar cmdchar; |
| 104 | char *text; |
| 105 | } esp_cmd_strings[] = { |
| 106 | /* Miscellaneous */ |
| 107 | { ESP_CMD_NULL, "ESP_NOP", }, |
| 108 | { ESP_CMD_FLUSH, "FIFO_FLUSH", }, |
| 109 | { ESP_CMD_RC, "RSTESP", }, |
| 110 | { ESP_CMD_RS, "RSTSCSI", }, |
| 111 | /* Disconnected State Group */ |
| 112 | { ESP_CMD_RSEL, "RESLCTSEQ", }, |
| 113 | { ESP_CMD_SEL, "SLCTNATN", }, |
| 114 | { ESP_CMD_SELA, "SLCTATN", }, |
| 115 | { ESP_CMD_SELAS, "SLCTATNSTOP", }, |
| 116 | { ESP_CMD_ESEL, "ENSLCTRESEL", }, |
| 117 | { ESP_CMD_DSEL, "DISSELRESEL", }, |
| 118 | { ESP_CMD_SA3, "SLCTATN3", }, |
| 119 | { ESP_CMD_RSEL3, "RESLCTSEQ", }, |
| 120 | /* Target State Group */ |
| 121 | { ESP_CMD_SMSG, "SNDMSG", }, |
| 122 | { ESP_CMD_SSTAT, "SNDSTATUS", }, |
| 123 | { ESP_CMD_SDATA, "SNDDATA", }, |
| 124 | { ESP_CMD_DSEQ, "DISCSEQ", }, |
| 125 | { ESP_CMD_TSEQ, "TERMSEQ", }, |
| 126 | { ESP_CMD_TCCSEQ, "TRGTCMDCOMPSEQ", }, |
| 127 | { ESP_CMD_DCNCT, "DISC", }, |
| 128 | { ESP_CMD_RMSG, "RCVMSG", }, |
| 129 | { ESP_CMD_RCMD, "RCVCMD", }, |
| 130 | { ESP_CMD_RDATA, "RCVDATA", }, |
| 131 | { ESP_CMD_RCSEQ, "RCVCMDSEQ", }, |
| 132 | /* Initiator State Group */ |
| 133 | { ESP_CMD_TI, "TRANSINFO", }, |
| 134 | { ESP_CMD_ICCSEQ, "INICMDSEQCOMP", }, |
| 135 | { ESP_CMD_MOK, "MSGACCEPTED", }, |
| 136 | { ESP_CMD_TPAD, "TPAD", }, |
| 137 | { ESP_CMD_SATN, "SATN", }, |
| 138 | { ESP_CMD_RATN, "RATN", }, |
| 139 | }; |
| 140 | #define NUM_ESP_COMMANDS ((sizeof(esp_cmd_strings)) / (sizeof(struct esp_cmdstrings))) |
| 141 | |
| 142 | /* Print textual representation of an ESP command */ |
| 143 | static inline void esp_print_cmd(unchar espcmd) |
| 144 | { |
| 145 | unchar dma_bit = espcmd & ESP_CMD_DMA; |
| 146 | int i; |
| 147 | |
| 148 | espcmd &= ~dma_bit; |
| 149 | for(i=0; i<NUM_ESP_COMMANDS; i++) |
| 150 | if(esp_cmd_strings[i].cmdchar == espcmd) |
| 151 | break; |
| 152 | if(i==NUM_ESP_COMMANDS) |
| 153 | printk("ESP_Unknown"); |
| 154 | else |
| 155 | printk("%s%s", esp_cmd_strings[i].text, |
| 156 | ((dma_bit) ? "+DMA" : "")); |
| 157 | } |
| 158 | |
| 159 | /* Print the status register's value */ |
| 160 | static inline void esp_print_statreg(unchar statreg) |
| 161 | { |
| 162 | unchar phase; |
| 163 | |
| 164 | printk("STATUS<"); |
| 165 | phase = statreg & ESP_STAT_PMASK; |
| 166 | printk("%s,", (phase == ESP_DOP ? "DATA-OUT" : |
| 167 | (phase == ESP_DIP ? "DATA-IN" : |
| 168 | (phase == ESP_CMDP ? "COMMAND" : |
| 169 | (phase == ESP_STATP ? "STATUS" : |
| 170 | (phase == ESP_MOP ? "MSG-OUT" : |
| 171 | (phase == ESP_MIP ? "MSG_IN" : |
| 172 | "unknown"))))))); |
| 173 | if(statreg & ESP_STAT_TDONE) |
| 174 | printk("TRANS_DONE,"); |
| 175 | if(statreg & ESP_STAT_TCNT) |
| 176 | printk("TCOUNT_ZERO,"); |
| 177 | if(statreg & ESP_STAT_PERR) |
| 178 | printk("P_ERROR,"); |
| 179 | if(statreg & ESP_STAT_SPAM) |
| 180 | printk("SPAM,"); |
| 181 | if(statreg & ESP_STAT_INTR) |
| 182 | printk("IRQ,"); |
| 183 | printk(">"); |
| 184 | } |
| 185 | |
| 186 | /* Print the interrupt register's value */ |
| 187 | static inline void esp_print_ireg(unchar intreg) |
| 188 | { |
| 189 | printk("INTREG< "); |
| 190 | if(intreg & ESP_INTR_S) |
| 191 | printk("SLCT_NATN "); |
| 192 | if(intreg & ESP_INTR_SATN) |
| 193 | printk("SLCT_ATN "); |
| 194 | if(intreg & ESP_INTR_RSEL) |
| 195 | printk("RSLCT "); |
| 196 | if(intreg & ESP_INTR_FDONE) |
| 197 | printk("FDONE "); |
| 198 | if(intreg & ESP_INTR_BSERV) |
| 199 | printk("BSERV "); |
| 200 | if(intreg & ESP_INTR_DC) |
| 201 | printk("DISCNCT "); |
| 202 | if(intreg & ESP_INTR_IC) |
| 203 | printk("ILL_CMD "); |
| 204 | if(intreg & ESP_INTR_SR) |
| 205 | printk("SCSI_BUS_RESET "); |
| 206 | printk(">"); |
| 207 | } |
| 208 | |
| 209 | /* Print the sequence step registers contents */ |
| 210 | static inline void esp_print_seqreg(unchar stepreg) |
| 211 | { |
| 212 | stepreg &= ESP_STEP_VBITS; |
| 213 | printk("STEP<%s>", |
| 214 | (stepreg == ESP_STEP_ASEL ? "SLCT_ARB_CMPLT" : |
| 215 | (stepreg == ESP_STEP_SID ? "1BYTE_MSG_SENT" : |
| 216 | (stepreg == ESP_STEP_NCMD ? "NOT_IN_CMD_PHASE" : |
| 217 | (stepreg == ESP_STEP_PPC ? "CMD_BYTES_LOST" : |
| 218 | (stepreg == ESP_STEP_FINI4 ? "CMD_SENT_OK" : |
| 219 | "UNKNOWN")))))); |
| 220 | } |
| 221 | |
| 222 | static char *phase_string(int phase) |
| 223 | { |
| 224 | switch(phase) { |
| 225 | case not_issued: |
| 226 | return "UNISSUED"; |
| 227 | case in_slct_norm: |
| 228 | return "SLCTNORM"; |
| 229 | case in_slct_stop: |
| 230 | return "SLCTSTOP"; |
| 231 | case in_slct_msg: |
| 232 | return "SLCTMSG"; |
| 233 | case in_slct_tag: |
| 234 | return "SLCTTAG"; |
| 235 | case in_slct_sneg: |
| 236 | return "SLCTSNEG"; |
| 237 | case in_datain: |
| 238 | return "DATAIN"; |
| 239 | case in_dataout: |
| 240 | return "DATAOUT"; |
| 241 | case in_data_done: |
| 242 | return "DATADONE"; |
| 243 | case in_msgin: |
| 244 | return "MSGIN"; |
| 245 | case in_msgincont: |
| 246 | return "MSGINCONT"; |
| 247 | case in_msgindone: |
| 248 | return "MSGINDONE"; |
| 249 | case in_msgout: |
| 250 | return "MSGOUT"; |
| 251 | case in_msgoutdone: |
| 252 | return "MSGOUTDONE"; |
| 253 | case in_cmdbegin: |
| 254 | return "CMDBEGIN"; |
| 255 | case in_cmdend: |
| 256 | return "CMDEND"; |
| 257 | case in_status: |
| 258 | return "STATUS"; |
| 259 | case in_freeing: |
| 260 | return "FREEING"; |
| 261 | case in_the_dark: |
| 262 | return "CLUELESS"; |
| 263 | case in_abortone: |
| 264 | return "ABORTONE"; |
| 265 | case in_abortall: |
| 266 | return "ABORTALL"; |
| 267 | case in_resetdev: |
| 268 | return "RESETDEV"; |
| 269 | case in_resetbus: |
| 270 | return "RESETBUS"; |
| 271 | case in_tgterror: |
| 272 | return "TGTERROR"; |
| 273 | default: |
| 274 | return "UNKNOWN"; |
| 275 | }; |
| 276 | } |
| 277 | |
| 278 | #ifdef DEBUG_STATE_MACHINE |
| 279 | static inline void esp_advance_phase(Scsi_Cmnd *s, int newphase) |
| 280 | { |
| 281 | ESPLOG(("<%s>", phase_string(newphase))); |
| 282 | s->SCp.sent_command = s->SCp.phase; |
| 283 | s->SCp.phase = newphase; |
| 284 | } |
| 285 | #else |
| 286 | #define esp_advance_phase(__s, __newphase) \ |
| 287 | (__s)->SCp.sent_command = (__s)->SCp.phase; \ |
| 288 | (__s)->SCp.phase = (__newphase); |
| 289 | #endif |
| 290 | |
| 291 | #ifdef DEBUG_ESP_CMDS |
| 292 | static inline void esp_cmd(struct NCR_ESP *esp, struct ESP_regs *eregs, |
| 293 | unchar cmd) |
| 294 | { |
| 295 | esp->espcmdlog[esp->espcmdent] = cmd; |
| 296 | esp->espcmdent = (esp->espcmdent + 1) & 31; |
| 297 | esp_write(eregs->esp_cmnd, cmd); |
| 298 | } |
| 299 | #else |
| 300 | #define esp_cmd(__esp, __eregs, __cmd) esp_write((__eregs)->esp_cmnd, (__cmd)) |
| 301 | #endif |
| 302 | |
| 303 | /* How we use the various Linux SCSI data structures for operation. |
| 304 | * |
| 305 | * struct scsi_cmnd: |
| 306 | * |
| 307 | * We keep track of the syncronous capabilities of a target |
| 308 | * in the device member, using sync_min_period and |
| 309 | * sync_max_offset. These are the values we directly write |
| 310 | * into the ESP registers while running a command. If offset |
| 311 | * is zero the ESP will use asynchronous transfers. |
| 312 | * If the borken flag is set we assume we shouldn't even bother |
| 313 | * trying to negotiate for synchronous transfer as this target |
| 314 | * is really stupid. If we notice the target is dropping the |
| 315 | * bus, and we have been allowing it to disconnect, we clear |
| 316 | * the disconnect flag. |
| 317 | */ |
| 318 | |
| 319 | /* Manipulation of the ESP command queues. Thanks to the aha152x driver |
| 320 | * and its author, Juergen E. Fischer, for the methods used here. |
| 321 | * Note that these are per-ESP queues, not global queues like |
| 322 | * the aha152x driver uses. |
| 323 | */ |
| 324 | static inline void append_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) |
| 325 | { |
| 326 | Scsi_Cmnd *end; |
| 327 | |
| 328 | new_SC->host_scribble = (unsigned char *) NULL; |
| 329 | if(!*SC) |
| 330 | *SC = new_SC; |
| 331 | else { |
| 332 | for(end=*SC;end->host_scribble;end=(Scsi_Cmnd *)end->host_scribble) |
| 333 | ; |
| 334 | end->host_scribble = (unsigned char *) new_SC; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | static inline void prepend_SC(Scsi_Cmnd **SC, Scsi_Cmnd *new_SC) |
| 339 | { |
| 340 | new_SC->host_scribble = (unsigned char *) *SC; |
| 341 | *SC = new_SC; |
| 342 | } |
| 343 | |
| 344 | static inline Scsi_Cmnd *remove_first_SC(Scsi_Cmnd **SC) |
| 345 | { |
| 346 | Scsi_Cmnd *ptr; |
| 347 | |
| 348 | ptr = *SC; |
| 349 | if(ptr) |
| 350 | *SC = (Scsi_Cmnd *) (*SC)->host_scribble; |
| 351 | return ptr; |
| 352 | } |
| 353 | |
| 354 | static inline Scsi_Cmnd *remove_SC(Scsi_Cmnd **SC, int target, int lun) |
| 355 | { |
| 356 | Scsi_Cmnd *ptr, *prev; |
| 357 | |
| 358 | for(ptr = *SC, prev = NULL; |
| 359 | ptr && ((ptr->device->id != target) || (ptr->device->lun != lun)); |
| 360 | prev = ptr, ptr = (Scsi_Cmnd *) ptr->host_scribble) |
| 361 | ; |
| 362 | if(ptr) { |
| 363 | if(prev) |
| 364 | prev->host_scribble=ptr->host_scribble; |
| 365 | else |
| 366 | *SC=(Scsi_Cmnd *)ptr->host_scribble; |
| 367 | } |
| 368 | return ptr; |
| 369 | } |
| 370 | |
| 371 | /* Resetting various pieces of the ESP scsi driver chipset */ |
| 372 | |
| 373 | /* Reset the ESP chip, _not_ the SCSI bus. */ |
| 374 | static void esp_reset_esp(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 375 | { |
| 376 | int family_code, version, i; |
| 377 | volatile int trash; |
| 378 | |
| 379 | /* Now reset the ESP chip */ |
| 380 | esp_cmd(esp, eregs, ESP_CMD_RC); |
| 381 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); |
| 382 | if(esp->erev == fast) |
| 383 | esp_write(eregs->esp_cfg2, ESP_CONFIG2_FENAB); |
| 384 | esp_cmd(esp, eregs, ESP_CMD_NULL | ESP_CMD_DMA); |
| 385 | |
| 386 | /* This is the only point at which it is reliable to read |
| 387 | * the ID-code for a fast ESP chip variant. |
| 388 | */ |
| 389 | esp->max_period = ((35 * esp->ccycle) / 1000); |
| 390 | if(esp->erev == fast) { |
| 391 | char *erev2string[] = { |
| 392 | "Emulex FAS236", |
| 393 | "Emulex FPESP100A", |
| 394 | "fast", |
| 395 | "QLogic FAS366", |
| 396 | "Emulex FAS216", |
| 397 | "Symbios Logic 53CF9x-2", |
| 398 | "unknown!" |
| 399 | }; |
| 400 | |
| 401 | version = esp_read(eregs->esp_uid); |
| 402 | family_code = (version & 0xf8) >> 3; |
| 403 | if(family_code == 0x02) { |
| 404 | if ((version & 7) == 2) |
| 405 | esp->erev = fas216; |
| 406 | else |
| 407 | esp->erev = fas236; |
| 408 | } else if(family_code == 0x0a) |
| 409 | esp->erev = fas366; /* Version is usually '5'. */ |
| 410 | else if(family_code == 0x00) { |
| 411 | if ((version & 7) == 2) |
| 412 | esp->erev = fas100a; /* NCR53C9X */ |
| 413 | else |
| 414 | esp->erev = espunknown; |
| 415 | } else if(family_code == 0x14) { |
| 416 | if ((version & 7) == 2) |
| 417 | esp->erev = fsc; |
| 418 | else |
| 419 | esp->erev = espunknown; |
| 420 | } else if(family_code == 0x00) { |
| 421 | if ((version & 7) == 2) |
| 422 | esp->erev = fas100a; /* NCR53C9X */ |
| 423 | else |
| 424 | esp->erev = espunknown; |
| 425 | } else |
| 426 | esp->erev = espunknown; |
| 427 | ESPLOG(("esp%d: FAST chip is %s (family=%d, version=%d)\n", |
| 428 | esp->esp_id, erev2string[esp->erev - fas236], |
| 429 | family_code, (version & 7))); |
| 430 | |
| 431 | esp->min_period = ((4 * esp->ccycle) / 1000); |
| 432 | } else { |
| 433 | esp->min_period = ((5 * esp->ccycle) / 1000); |
| 434 | } |
| 435 | |
| 436 | /* Reload the configuration registers */ |
| 437 | esp_write(eregs->esp_cfact, esp->cfact); |
| 438 | esp->prev_stp = 0; |
| 439 | esp_write(eregs->esp_stp, 0); |
| 440 | esp->prev_soff = 0; |
| 441 | esp_write(eregs->esp_soff, 0); |
| 442 | esp_write(eregs->esp_timeo, esp->neg_defp); |
| 443 | esp->max_period = (esp->max_period + 3)>>2; |
| 444 | esp->min_period = (esp->min_period + 3)>>2; |
| 445 | |
| 446 | esp_write(eregs->esp_cfg1, esp->config1); |
| 447 | switch(esp->erev) { |
| 448 | case esp100: |
| 449 | /* nothing to do */ |
| 450 | break; |
| 451 | case esp100a: |
| 452 | esp_write(eregs->esp_cfg2, esp->config2); |
| 453 | break; |
| 454 | case esp236: |
| 455 | /* Slow 236 */ |
| 456 | esp_write(eregs->esp_cfg2, esp->config2); |
| 457 | esp->prev_cfg3 = esp->config3[0]; |
| 458 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 459 | break; |
| 460 | case fas366: |
| 461 | panic("esp: FAS366 support not present, please notify " |
| 462 | "jongk@cs.utwente.nl"); |
| 463 | break; |
| 464 | case fas216: |
| 465 | case fas236: |
| 466 | case fsc: |
| 467 | /* Fast ESP variants */ |
| 468 | esp_write(eregs->esp_cfg2, esp->config2); |
| 469 | for(i=0; i<8; i++) |
| 470 | esp->config3[i] |= ESP_CONFIG3_FCLK; |
| 471 | esp->prev_cfg3 = esp->config3[0]; |
| 472 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 473 | if(esp->diff) |
| 474 | esp->radelay = 0; |
| 475 | else |
| 476 | esp->radelay = 16; |
| 477 | /* Different timeout constant for these chips */ |
| 478 | esp->neg_defp = |
| 479 | FSC_NEG_DEFP(esp->cfreq, |
| 480 | (esp->cfact == ESP_CCF_F0 ? |
| 481 | ESP_CCF_F7 + 1 : esp->cfact)); |
| 482 | esp_write(eregs->esp_timeo, esp->neg_defp); |
| 483 | /* Enable Active Negotiation if possible */ |
| 484 | if((esp->erev == fsc) && !esp->diff) |
| 485 | esp_write(eregs->esp_cfg4, ESP_CONFIG4_EAN); |
| 486 | break; |
| 487 | case fas100a: |
| 488 | /* Fast 100a */ |
| 489 | esp_write(eregs->esp_cfg2, esp->config2); |
| 490 | for(i=0; i<8; i++) |
| 491 | esp->config3[i] |= ESP_CONFIG3_FCLOCK; |
| 492 | esp->prev_cfg3 = esp->config3[0]; |
| 493 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 494 | esp->radelay = 32; |
| 495 | break; |
| 496 | default: |
| 497 | panic("esp: what could it be... I wonder..."); |
| 498 | break; |
| 499 | }; |
| 500 | |
| 501 | /* Eat any bitrot in the chip */ |
| 502 | trash = esp_read(eregs->esp_intrpt); |
| 503 | udelay(100); |
| 504 | } |
| 505 | |
| 506 | /* This places the ESP into a known state at boot time. */ |
| 507 | void esp_bootup_reset(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 508 | { |
| 509 | volatile unchar trash; |
| 510 | |
| 511 | /* Reset the DMA */ |
| 512 | if(esp->dma_reset) |
| 513 | esp->dma_reset(esp); |
| 514 | |
| 515 | /* Reset the ESP */ |
| 516 | esp_reset_esp(esp, eregs); |
| 517 | |
| 518 | /* Reset the SCSI bus, but tell ESP not to generate an irq */ |
| 519 | esp_write(eregs->esp_cfg1, (esp_read(eregs->esp_cfg1) | ESP_CONFIG1_SRRDISAB)); |
| 520 | esp_cmd(esp, eregs, ESP_CMD_RS); |
| 521 | udelay(400); |
| 522 | esp_write(eregs->esp_cfg1, esp->config1); |
| 523 | |
| 524 | /* Eat any bitrot in the chip and we are done... */ |
| 525 | trash = esp_read(eregs->esp_intrpt); |
| 526 | } |
| 527 | |
| 528 | /* Allocate structure and insert basic data such as SCSI chip frequency |
| 529 | * data and a pointer to the device |
| 530 | */ |
Maciej W. Rozycki | 4df4db5 | 2007-02-05 16:28:29 -0800 | [diff] [blame] | 531 | struct NCR_ESP* esp_allocate(struct scsi_host_template *tpnt, void *esp_dev, |
| 532 | int hotplug) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | { |
| 534 | struct NCR_ESP *esp, *elink; |
| 535 | struct Scsi_Host *esp_host; |
| 536 | |
Maciej W. Rozycki | 4df4db5 | 2007-02-05 16:28:29 -0800 | [diff] [blame] | 537 | if (hotplug) |
| 538 | esp_host = scsi_host_alloc(tpnt, sizeof(struct NCR_ESP)); |
| 539 | else |
| 540 | esp_host = scsi_register(tpnt, sizeof(struct NCR_ESP)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | if(!esp_host) |
| 542 | panic("Cannot register ESP SCSI host"); |
| 543 | esp = (struct NCR_ESP *) esp_host->hostdata; |
| 544 | if(!esp) |
| 545 | panic("No esp in hostdata"); |
| 546 | esp->ehost = esp_host; |
| 547 | esp->edev = esp_dev; |
| 548 | esp->esp_id = nesps++; |
| 549 | |
| 550 | /* Set bitshift value (only used on Amiga with multiple ESPs) */ |
| 551 | esp->shift = 2; |
| 552 | |
| 553 | /* Put into the chain of esp chips detected */ |
| 554 | if(espchain) { |
| 555 | elink = espchain; |
| 556 | while(elink->next) elink = elink->next; |
| 557 | elink->next = esp; |
| 558 | } else { |
| 559 | espchain = esp; |
| 560 | } |
| 561 | esp->next = NULL; |
| 562 | |
| 563 | return esp; |
| 564 | } |
| 565 | |
| 566 | void esp_deallocate(struct NCR_ESP *esp) |
| 567 | { |
| 568 | struct NCR_ESP *elink; |
| 569 | |
| 570 | if(espchain == esp) { |
| 571 | espchain = NULL; |
| 572 | } else { |
| 573 | for(elink = espchain; elink && (elink->next != esp); elink = elink->next); |
| 574 | if(elink) |
| 575 | elink->next = esp->next; |
| 576 | } |
| 577 | nesps--; |
| 578 | } |
| 579 | |
| 580 | /* Complete initialization of ESP structure and device |
| 581 | * Caller must have initialized appropriate parts of the ESP structure |
| 582 | * between the call to esp_allocate and this function. |
| 583 | */ |
| 584 | void esp_initialize(struct NCR_ESP *esp) |
| 585 | { |
| 586 | struct ESP_regs *eregs = esp->eregs; |
| 587 | unsigned int fmhz; |
| 588 | unchar ccf; |
| 589 | int i; |
| 590 | |
| 591 | /* Check out the clock properties of the chip. */ |
| 592 | |
| 593 | /* This is getting messy but it has to be done |
| 594 | * correctly or else you get weird behavior all |
| 595 | * over the place. We are trying to basically |
| 596 | * figure out three pieces of information. |
| 597 | * |
| 598 | * a) Clock Conversion Factor |
| 599 | * |
| 600 | * This is a representation of the input |
| 601 | * crystal clock frequency going into the |
| 602 | * ESP on this machine. Any operation whose |
| 603 | * timing is longer than 400ns depends on this |
| 604 | * value being correct. For example, you'll |
| 605 | * get blips for arbitration/selection during |
| 606 | * high load or with multiple targets if this |
| 607 | * is not set correctly. |
| 608 | * |
| 609 | * b) Selection Time-Out |
| 610 | * |
| 611 | * The ESP isn't very bright and will arbitrate |
| 612 | * for the bus and try to select a target |
| 613 | * forever if you let it. This value tells |
| 614 | * the ESP when it has taken too long to |
| 615 | * negotiate and that it should interrupt |
| 616 | * the CPU so we can see what happened. |
| 617 | * The value is computed as follows (from |
| 618 | * NCR/Symbios chip docs). |
| 619 | * |
| 620 | * (Time Out Period) * (Input Clock) |
| 621 | * STO = ---------------------------------- |
| 622 | * (8192) * (Clock Conversion Factor) |
| 623 | * |
| 624 | * You usually want the time out period to be |
| 625 | * around 250ms, I think we'll set it a little |
| 626 | * bit higher to account for fully loaded SCSI |
| 627 | * bus's and slow devices that don't respond so |
| 628 | * quickly to selection attempts. (yeah, I know |
| 629 | * this is out of spec. but there is a lot of |
| 630 | * buggy pieces of firmware out there so bite me) |
| 631 | * |
| 632 | * c) Imperical constants for synchronous offset |
| 633 | * and transfer period register values |
| 634 | * |
| 635 | * This entails the smallest and largest sync |
| 636 | * period we could ever handle on this ESP. |
| 637 | */ |
| 638 | |
| 639 | fmhz = esp->cfreq; |
| 640 | |
| 641 | if(fmhz <= (5000000)) |
| 642 | ccf = 0; |
| 643 | else |
| 644 | ccf = (((5000000 - 1) + (fmhz))/(5000000)); |
| 645 | if(!ccf || ccf > 8) { |
| 646 | /* If we can't find anything reasonable, |
| 647 | * just assume 20MHZ. This is the clock |
| 648 | * frequency of the older sun4c's where I've |
| 649 | * been unable to find the clock-frequency |
| 650 | * PROM property. All other machines provide |
| 651 | * useful values it seems. |
| 652 | */ |
| 653 | ccf = ESP_CCF_F4; |
| 654 | fmhz = (20000000); |
| 655 | } |
| 656 | if(ccf==(ESP_CCF_F7+1)) |
| 657 | esp->cfact = ESP_CCF_F0; |
| 658 | else if(ccf == ESP_CCF_NEVER) |
| 659 | esp->cfact = ESP_CCF_F2; |
| 660 | else |
| 661 | esp->cfact = ccf; |
| 662 | esp->cfreq = fmhz; |
| 663 | esp->ccycle = ESP_MHZ_TO_CYCLE(fmhz); |
| 664 | esp->ctick = ESP_TICK(ccf, esp->ccycle); |
| 665 | esp->neg_defp = ESP_NEG_DEFP(fmhz, ccf); |
| 666 | esp->sync_defp = SYNC_DEFP_SLOW; |
| 667 | |
| 668 | printk("SCSI ID %d Clk %dMHz CCF=%d TOut %d ", |
| 669 | esp->scsi_id, (esp->cfreq / 1000000), |
| 670 | ccf, (int) esp->neg_defp); |
| 671 | |
| 672 | /* Fill in ehost data */ |
| 673 | esp->ehost->base = (unsigned long)eregs; |
| 674 | esp->ehost->this_id = esp->scsi_id; |
| 675 | esp->ehost->irq = esp->irq; |
| 676 | |
| 677 | /* SCSI id mask */ |
| 678 | esp->scsi_id_mask = (1 << esp->scsi_id); |
| 679 | |
| 680 | /* Probe the revision of this esp */ |
| 681 | esp->config1 = (ESP_CONFIG1_PENABLE | (esp->scsi_id & 7)); |
| 682 | esp->config2 = (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY); |
| 683 | esp_write(eregs->esp_cfg2, esp->config2); |
| 684 | if((esp_read(eregs->esp_cfg2) & ~(ESP_CONFIG2_MAGIC)) != |
| 685 | (ESP_CONFIG2_SCSI2ENAB | ESP_CONFIG2_REGPARITY)) { |
| 686 | printk("NCR53C90(esp100)\n"); |
| 687 | esp->erev = esp100; |
| 688 | } else { |
| 689 | esp->config2 = 0; |
| 690 | esp_write(eregs->esp_cfg2, 0); |
| 691 | esp_write(eregs->esp_cfg3, 5); |
| 692 | if(esp_read(eregs->esp_cfg3) != 5) { |
| 693 | printk("NCR53C90A(esp100a)\n"); |
| 694 | esp->erev = esp100a; |
| 695 | } else { |
| 696 | int target; |
| 697 | |
| 698 | for(target=0; target<8; target++) |
| 699 | esp->config3[target] = 0; |
| 700 | esp->prev_cfg3 = 0; |
| 701 | esp_write(eregs->esp_cfg3, 0); |
| 702 | if(ccf > ESP_CCF_F5) { |
| 703 | printk("NCR53C9XF(espfast)\n"); |
| 704 | esp->erev = fast; |
| 705 | esp->sync_defp = SYNC_DEFP_FAST; |
| 706 | } else { |
| 707 | printk("NCR53C9x(esp236)\n"); |
| 708 | esp->erev = esp236; |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | /* Initialize the command queues */ |
| 714 | esp->current_SC = NULL; |
| 715 | esp->disconnected_SC = NULL; |
| 716 | esp->issue_SC = NULL; |
| 717 | |
| 718 | /* Clear the state machines. */ |
| 719 | esp->targets_present = 0; |
| 720 | esp->resetting_bus = 0; |
| 721 | esp->snip = 0; |
| 722 | |
| 723 | init_waitqueue_head(&esp->reset_queue); |
| 724 | |
| 725 | esp->fas_premature_intr_workaround = 0; |
| 726 | for(i = 0; i < 32; i++) |
| 727 | esp->espcmdlog[i] = 0; |
| 728 | esp->espcmdent = 0; |
| 729 | for(i = 0; i < 16; i++) { |
| 730 | esp->cur_msgout[i] = 0; |
| 731 | esp->cur_msgin[i] = 0; |
| 732 | } |
| 733 | esp->prevmsgout = esp->prevmsgin = 0; |
| 734 | esp->msgout_len = esp->msgin_len = 0; |
| 735 | |
| 736 | /* Clear the one behind caches to hold unmatchable values. */ |
| 737 | esp->prev_soff = esp->prev_stp = esp->prev_cfg3 = 0xff; |
| 738 | |
| 739 | /* Reset the thing before we try anything... */ |
| 740 | esp_bootup_reset(esp, eregs); |
| 741 | |
| 742 | esps_in_use++; |
| 743 | } |
| 744 | |
| 745 | /* The info function will return whatever useful |
| 746 | * information the developer sees fit. If not provided, then |
| 747 | * the name field will be used instead. |
| 748 | */ |
| 749 | const char *esp_info(struct Scsi_Host *host) |
| 750 | { |
| 751 | struct NCR_ESP *esp; |
| 752 | |
| 753 | esp = (struct NCR_ESP *) host->hostdata; |
| 754 | switch(esp->erev) { |
| 755 | case esp100: |
| 756 | return "ESP100 (NCR53C90)"; |
| 757 | case esp100a: |
| 758 | return "ESP100A (NCR53C90A)"; |
| 759 | case esp236: |
| 760 | return "ESP236 (NCR53C9x)"; |
| 761 | case fas216: |
| 762 | return "Emulex FAS216"; |
| 763 | case fas236: |
| 764 | return "Emulex FAS236"; |
| 765 | case fas366: |
| 766 | return "QLogic FAS366"; |
| 767 | case fas100a: |
| 768 | return "FPESP100A"; |
| 769 | case fsc: |
| 770 | return "Symbios Logic 53CF9x-2"; |
| 771 | default: |
| 772 | panic("Bogon ESP revision"); |
| 773 | }; |
| 774 | } |
| 775 | |
| 776 | /* From Wolfgang Stanglmeier's NCR scsi driver. */ |
| 777 | struct info_str |
| 778 | { |
| 779 | char *buffer; |
| 780 | int length; |
| 781 | int offset; |
| 782 | int pos; |
| 783 | }; |
| 784 | |
| 785 | static void copy_mem_info(struct info_str *info, char *data, int len) |
| 786 | { |
| 787 | if (info->pos + len > info->length) |
| 788 | len = info->length - info->pos; |
| 789 | |
| 790 | if (info->pos + len < info->offset) { |
| 791 | info->pos += len; |
| 792 | return; |
| 793 | } |
| 794 | if (info->pos < info->offset) { |
| 795 | data += (info->offset - info->pos); |
| 796 | len -= (info->offset - info->pos); |
| 797 | } |
| 798 | |
| 799 | if (len > 0) { |
| 800 | memcpy(info->buffer + info->pos, data, len); |
| 801 | info->pos += len; |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | static int copy_info(struct info_str *info, char *fmt, ...) |
| 806 | { |
| 807 | va_list args; |
| 808 | char buf[81]; |
| 809 | int len; |
| 810 | |
| 811 | va_start(args, fmt); |
| 812 | len = vsprintf(buf, fmt, args); |
| 813 | va_end(args); |
| 814 | |
| 815 | copy_mem_info(info, buf, len); |
| 816 | return len; |
| 817 | } |
| 818 | |
| 819 | static int esp_host_info(struct NCR_ESP *esp, char *ptr, off_t offset, int len) |
| 820 | { |
| 821 | struct scsi_device *sdev; |
| 822 | struct info_str info; |
| 823 | int i; |
| 824 | |
| 825 | info.buffer = ptr; |
| 826 | info.length = len; |
| 827 | info.offset = offset; |
| 828 | info.pos = 0; |
| 829 | |
| 830 | copy_info(&info, "ESP Host Adapter:\n"); |
| 831 | copy_info(&info, "\tESP Model\t\t"); |
| 832 | switch(esp->erev) { |
| 833 | case esp100: |
| 834 | copy_info(&info, "ESP100 (NCR53C90)\n"); |
| 835 | break; |
| 836 | case esp100a: |
| 837 | copy_info(&info, "ESP100A (NCR53C90A)\n"); |
| 838 | break; |
| 839 | case esp236: |
| 840 | copy_info(&info, "ESP236 (NCR53C9x)\n"); |
| 841 | break; |
| 842 | case fas216: |
| 843 | copy_info(&info, "Emulex FAS216\n"); |
| 844 | break; |
| 845 | case fas236: |
| 846 | copy_info(&info, "Emulex FAS236\n"); |
| 847 | break; |
| 848 | case fas100a: |
| 849 | copy_info(&info, "FPESP100A\n"); |
| 850 | break; |
| 851 | case fast: |
| 852 | copy_info(&info, "Generic FAST\n"); |
| 853 | break; |
| 854 | case fas366: |
| 855 | copy_info(&info, "QLogic FAS366\n"); |
| 856 | break; |
| 857 | case fsc: |
| 858 | copy_info(&info, "Symbios Logic 53C9x-2\n"); |
| 859 | break; |
| 860 | case espunknown: |
| 861 | default: |
| 862 | copy_info(&info, "Unknown!\n"); |
| 863 | break; |
| 864 | }; |
| 865 | copy_info(&info, "\tLive Targets\t\t[ "); |
| 866 | for(i = 0; i < 15; i++) { |
| 867 | if(esp->targets_present & (1 << i)) |
| 868 | copy_info(&info, "%d ", i); |
| 869 | } |
| 870 | copy_info(&info, "]\n\n"); |
| 871 | |
| 872 | /* Now describe the state of each existing target. */ |
| 873 | copy_info(&info, "Target #\tconfig3\t\tSync Capabilities\tDisconnect\n"); |
| 874 | |
| 875 | shost_for_each_device(sdev, esp->ehost) { |
| 876 | struct esp_device *esp_dev = sdev->hostdata; |
| 877 | uint id = sdev->id; |
| 878 | |
| 879 | if (!(esp->targets_present & (1 << id))) |
| 880 | continue; |
| 881 | |
| 882 | copy_info(&info, "%d\t\t", id); |
| 883 | copy_info(&info, "%08lx\t", esp->config3[id]); |
| 884 | copy_info(&info, "[%02lx,%02lx]\t\t\t", |
| 885 | esp_dev->sync_max_offset, |
| 886 | esp_dev->sync_min_period); |
| 887 | copy_info(&info, "%s\n", esp_dev->disconnect ? "yes" : "no"); |
| 888 | } |
| 889 | |
| 890 | return info.pos > info.offset? info.pos - info.offset : 0; |
| 891 | } |
| 892 | |
| 893 | /* ESP proc filesystem code. */ |
| 894 | int esp_proc_info(struct Scsi_Host *shost, char *buffer, char **start, off_t offset, int length, |
| 895 | int inout) |
| 896 | { |
| 897 | struct NCR_ESP *esp = (struct NCR_ESP *)shost->hostdata; |
| 898 | |
| 899 | if(inout) |
| 900 | return -EINVAL; /* not yet */ |
| 901 | if(start) |
| 902 | *start = buffer; |
| 903 | return esp_host_info(esp, buffer, offset, length); |
| 904 | } |
| 905 | |
| 906 | static void esp_get_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 907 | { |
| 908 | if(sp->use_sg == 0) { |
| 909 | sp->SCp.this_residual = sp->request_bufflen; |
| 910 | sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; |
| 911 | sp->SCp.buffers_residual = 0; |
| 912 | if (esp->dma_mmu_get_scsi_one) |
| 913 | esp->dma_mmu_get_scsi_one(esp, sp); |
| 914 | else |
| 915 | sp->SCp.ptr = |
| 916 | (char *) virt_to_phys(sp->request_buffer); |
| 917 | } else { |
Christoph Hellwig | 79bd3f8 | 2006-07-14 10:29:34 +0200 | [diff] [blame] | 918 | sp->SCp.buffer = (struct scatterlist *) sp->request_buffer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | sp->SCp.buffers_residual = sp->use_sg - 1; |
| 920 | sp->SCp.this_residual = sp->SCp.buffer->length; |
| 921 | if (esp->dma_mmu_get_scsi_sgl) |
| 922 | esp->dma_mmu_get_scsi_sgl(esp, sp); |
| 923 | else |
| 924 | sp->SCp.ptr = |
| 925 | (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); |
| 926 | } |
| 927 | } |
| 928 | |
| 929 | static void esp_release_dmabufs(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 930 | { |
| 931 | if(sp->use_sg == 0) { |
| 932 | if (esp->dma_mmu_release_scsi_one) |
| 933 | esp->dma_mmu_release_scsi_one(esp, sp); |
| 934 | } else { |
| 935 | if (esp->dma_mmu_release_scsi_sgl) |
| 936 | esp->dma_mmu_release_scsi_sgl(esp, sp); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | static void esp_restore_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 941 | { |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 942 | struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | |
| 944 | sp->SCp.ptr = ep->saved_ptr; |
| 945 | sp->SCp.buffer = ep->saved_buffer; |
| 946 | sp->SCp.this_residual = ep->saved_this_residual; |
| 947 | sp->SCp.buffers_residual = ep->saved_buffers_residual; |
| 948 | } |
| 949 | |
| 950 | static void esp_save_pointers(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 951 | { |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 952 | struct esp_pointers *ep = &esp->data_pointers[scmd_id(sp)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | |
| 954 | ep->saved_ptr = sp->SCp.ptr; |
| 955 | ep->saved_buffer = sp->SCp.buffer; |
| 956 | ep->saved_this_residual = sp->SCp.this_residual; |
| 957 | ep->saved_buffers_residual = sp->SCp.buffers_residual; |
| 958 | } |
| 959 | |
| 960 | /* Some rules: |
| 961 | * |
| 962 | * 1) Never ever panic while something is live on the bus. |
| 963 | * If there is to be any chance of syncing the disks this |
| 964 | * rule is to be obeyed. |
| 965 | * |
| 966 | * 2) Any target that causes a foul condition will no longer |
| 967 | * have synchronous transfers done to it, no questions |
| 968 | * asked. |
| 969 | * |
| 970 | * 3) Keep register accesses to a minimum. Think about some |
| 971 | * day when we have Xbus machines this is running on and |
| 972 | * the ESP chip is on the other end of the machine on a |
| 973 | * different board from the cpu where this is running. |
| 974 | */ |
| 975 | |
| 976 | /* Fire off a command. We assume the bus is free and that the only |
| 977 | * case where we could see an interrupt is where we have disconnected |
| 978 | * commands active and they are trying to reselect us. |
| 979 | */ |
| 980 | static inline void esp_check_cmd(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 981 | { |
| 982 | switch(sp->cmd_len) { |
| 983 | case 6: |
| 984 | case 10: |
| 985 | case 12: |
| 986 | esp->esp_slowcmd = 0; |
| 987 | break; |
| 988 | |
| 989 | default: |
| 990 | esp->esp_slowcmd = 1; |
| 991 | esp->esp_scmdleft = sp->cmd_len; |
| 992 | esp->esp_scmdp = &sp->cmnd[0]; |
| 993 | break; |
| 994 | }; |
| 995 | } |
| 996 | |
| 997 | static inline void build_sync_nego_msg(struct NCR_ESP *esp, int period, int offset) |
| 998 | { |
| 999 | esp->cur_msgout[0] = EXTENDED_MESSAGE; |
| 1000 | esp->cur_msgout[1] = 3; |
| 1001 | esp->cur_msgout[2] = EXTENDED_SDTR; |
| 1002 | esp->cur_msgout[3] = period; |
| 1003 | esp->cur_msgout[4] = offset; |
| 1004 | esp->msgout_len = 5; |
| 1005 | } |
| 1006 | |
| 1007 | static void esp_exec_cmd(struct NCR_ESP *esp) |
| 1008 | { |
| 1009 | struct ESP_regs *eregs = esp->eregs; |
| 1010 | struct esp_device *esp_dev; |
| 1011 | Scsi_Cmnd *SCptr; |
Christoph Hellwig | f64a181 | 2005-10-31 18:32:08 +0100 | [diff] [blame] | 1012 | struct scsi_device *SDptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | volatile unchar *cmdp = esp->esp_command; |
| 1014 | unsigned char the_esp_command; |
| 1015 | int lun, target; |
| 1016 | int i; |
| 1017 | |
| 1018 | /* Hold off if we have disconnected commands and |
| 1019 | * an IRQ is showing... |
| 1020 | */ |
| 1021 | if(esp->disconnected_SC && esp->dma_irq_p(esp)) |
| 1022 | return; |
| 1023 | |
| 1024 | /* Grab first member of the issue queue. */ |
| 1025 | SCptr = esp->current_SC = remove_first_SC(&esp->issue_SC); |
| 1026 | |
| 1027 | /* Safe to panic here because current_SC is null. */ |
| 1028 | if(!SCptr) |
| 1029 | panic("esp: esp_exec_cmd and issue queue is NULL"); |
| 1030 | |
| 1031 | SDptr = SCptr->device; |
| 1032 | esp_dev = SDptr->hostdata; |
| 1033 | lun = SCptr->device->lun; |
| 1034 | target = SCptr->device->id; |
| 1035 | |
| 1036 | esp->snip = 0; |
| 1037 | esp->msgout_len = 0; |
| 1038 | |
| 1039 | /* Send it out whole, or piece by piece? The ESP |
| 1040 | * only knows how to automatically send out 6, 10, |
| 1041 | * and 12 byte commands. I used to think that the |
| 1042 | * Linux SCSI code would never throw anything other |
| 1043 | * than that to us, but then again there is the |
| 1044 | * SCSI generic driver which can send us anything. |
| 1045 | */ |
| 1046 | esp_check_cmd(esp, SCptr); |
| 1047 | |
| 1048 | /* If arbitration/selection is successful, the ESP will leave |
| 1049 | * ATN asserted, causing the target to go into message out |
| 1050 | * phase. The ESP will feed the target the identify and then |
| 1051 | * the target can only legally go to one of command, |
| 1052 | * datain/out, status, or message in phase, or stay in message |
| 1053 | * out phase (should we be trying to send a sync negotiation |
| 1054 | * message after the identify). It is not allowed to drop |
| 1055 | * BSY, but some buggy targets do and we check for this |
| 1056 | * condition in the selection complete code. Most of the time |
| 1057 | * we'll make the command bytes available to the ESP and it |
| 1058 | * will not interrupt us until it finishes command phase, we |
| 1059 | * cannot do this for command sizes the ESP does not |
| 1060 | * understand and in this case we'll get interrupted right |
| 1061 | * when the target goes into command phase. |
| 1062 | * |
| 1063 | * It is absolutely _illegal_ in the presence of SCSI-2 devices |
| 1064 | * to use the ESP select w/o ATN command. When SCSI-2 devices are |
| 1065 | * present on the bus we _must_ always go straight to message out |
| 1066 | * phase with an identify message for the target. Being that |
| 1067 | * selection attempts in SCSI-1 w/o ATN was an option, doing SCSI-2 |
| 1068 | * selections should not confuse SCSI-1 we hope. |
| 1069 | */ |
| 1070 | |
| 1071 | if(esp_dev->sync) { |
| 1072 | /* this targets sync is known */ |
| 1073 | #ifdef CONFIG_SCSI_MAC_ESP |
| 1074 | do_sync_known: |
| 1075 | #endif |
| 1076 | if(esp_dev->disconnect) |
| 1077 | *cmdp++ = IDENTIFY(1, lun); |
| 1078 | else |
| 1079 | *cmdp++ = IDENTIFY(0, lun); |
| 1080 | |
| 1081 | if(esp->esp_slowcmd) { |
| 1082 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); |
| 1083 | esp_advance_phase(SCptr, in_slct_stop); |
| 1084 | } else { |
| 1085 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); |
| 1086 | esp_advance_phase(SCptr, in_slct_norm); |
| 1087 | } |
| 1088 | } else if(!(esp->targets_present & (1<<target)) || !(esp_dev->disconnect)) { |
| 1089 | /* After the bootup SCSI code sends both the |
| 1090 | * TEST_UNIT_READY and INQUIRY commands we want |
| 1091 | * to at least attempt allowing the device to |
| 1092 | * disconnect. |
| 1093 | */ |
| 1094 | ESPMISC(("esp: Selecting device for first time. target=%d " |
| 1095 | "lun=%d\n", target, SCptr->device->lun)); |
| 1096 | if(!SDptr->borken && !esp_dev->disconnect) |
| 1097 | esp_dev->disconnect = 1; |
| 1098 | |
| 1099 | *cmdp++ = IDENTIFY(0, lun); |
| 1100 | esp->prevmsgout = NOP; |
| 1101 | esp_advance_phase(SCptr, in_slct_norm); |
| 1102 | the_esp_command = (ESP_CMD_SELA | ESP_CMD_DMA); |
| 1103 | |
| 1104 | /* Take no chances... */ |
| 1105 | esp_dev->sync_max_offset = 0; |
| 1106 | esp_dev->sync_min_period = 0; |
| 1107 | } else { |
| 1108 | int toshiba_cdrom_hwbug_wkaround = 0; |
| 1109 | |
| 1110 | #ifdef CONFIG_SCSI_MAC_ESP |
| 1111 | /* Never allow synchronous transfers (disconnect OK) on |
| 1112 | * Macintosh. Well, maybe later when we figured out how to |
| 1113 | * do DMA on the machines that support it ... |
| 1114 | */ |
| 1115 | esp_dev->disconnect = 1; |
| 1116 | esp_dev->sync_max_offset = 0; |
| 1117 | esp_dev->sync_min_period = 0; |
| 1118 | esp_dev->sync = 1; |
| 1119 | esp->snip = 0; |
| 1120 | goto do_sync_known; |
| 1121 | #endif |
| 1122 | /* We've talked to this guy before, |
| 1123 | * but never negotiated. Let's try |
| 1124 | * sync negotiation. |
| 1125 | */ |
| 1126 | if(!SDptr->borken) { |
| 1127 | if((SDptr->type == TYPE_ROM) && |
| 1128 | (!strncmp(SDptr->vendor, "TOSHIBA", 7))) { |
| 1129 | /* Nice try sucker... */ |
| 1130 | ESPMISC(("esp%d: Disabling sync for buggy " |
| 1131 | "Toshiba CDROM.\n", esp->esp_id)); |
| 1132 | toshiba_cdrom_hwbug_wkaround = 1; |
| 1133 | build_sync_nego_msg(esp, 0, 0); |
| 1134 | } else { |
| 1135 | build_sync_nego_msg(esp, esp->sync_defp, 15); |
| 1136 | } |
| 1137 | } else { |
| 1138 | build_sync_nego_msg(esp, 0, 0); |
| 1139 | } |
| 1140 | esp_dev->sync = 1; |
| 1141 | esp->snip = 1; |
| 1142 | |
| 1143 | /* A fix for broken SCSI1 targets, when they disconnect |
| 1144 | * they lock up the bus and confuse ESP. So disallow |
| 1145 | * disconnects for SCSI1 targets for now until we |
| 1146 | * find a better fix. |
| 1147 | * |
| 1148 | * Addendum: This is funny, I figured out what was going |
| 1149 | * on. The blotzed SCSI1 target would disconnect, |
| 1150 | * one of the other SCSI2 targets or both would be |
| 1151 | * disconnected as well. The SCSI1 target would |
| 1152 | * stay disconnected long enough that we start |
| 1153 | * up a command on one of the SCSI2 targets. As |
| 1154 | * the ESP is arbitrating for the bus the SCSI1 |
| 1155 | * target begins to arbitrate as well to reselect |
| 1156 | * the ESP. The SCSI1 target refuses to drop it's |
| 1157 | * ID bit on the data bus even though the ESP is |
| 1158 | * at ID 7 and is the obvious winner for any |
| 1159 | * arbitration. The ESP is a poor sport and refuses |
| 1160 | * to lose arbitration, it will continue indefinitely |
| 1161 | * trying to arbitrate for the bus and can only be |
| 1162 | * stopped via a chip reset or SCSI bus reset. |
| 1163 | * Therefore _no_ disconnects for SCSI1 targets |
| 1164 | * thank you very much. ;-) |
| 1165 | */ |
| 1166 | if(((SDptr->scsi_level < 3) && (SDptr->type != TYPE_TAPE)) || |
| 1167 | toshiba_cdrom_hwbug_wkaround || SDptr->borken) { |
| 1168 | ESPMISC((KERN_INFO "esp%d: Disabling DISCONNECT for target %d " |
| 1169 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); |
| 1170 | esp_dev->disconnect = 0; |
| 1171 | *cmdp++ = IDENTIFY(0, lun); |
| 1172 | } else { |
| 1173 | *cmdp++ = IDENTIFY(1, lun); |
| 1174 | } |
| 1175 | |
| 1176 | /* ESP fifo is only so big... |
| 1177 | * Make this look like a slow command. |
| 1178 | */ |
| 1179 | esp->esp_slowcmd = 1; |
| 1180 | esp->esp_scmdleft = SCptr->cmd_len; |
| 1181 | esp->esp_scmdp = &SCptr->cmnd[0]; |
| 1182 | |
| 1183 | the_esp_command = (ESP_CMD_SELAS | ESP_CMD_DMA); |
| 1184 | esp_advance_phase(SCptr, in_slct_msg); |
| 1185 | } |
| 1186 | |
| 1187 | if(!esp->esp_slowcmd) |
| 1188 | for(i = 0; i < SCptr->cmd_len; i++) |
| 1189 | *cmdp++ = SCptr->cmnd[i]; |
| 1190 | |
| 1191 | esp_write(eregs->esp_busid, (target & 7)); |
| 1192 | if (esp->prev_soff != esp_dev->sync_max_offset || |
| 1193 | esp->prev_stp != esp_dev->sync_min_period || |
| 1194 | (esp->erev > esp100a && |
| 1195 | esp->prev_cfg3 != esp->config3[target])) { |
| 1196 | esp->prev_soff = esp_dev->sync_max_offset; |
| 1197 | esp_write(eregs->esp_soff, esp->prev_soff); |
| 1198 | esp->prev_stp = esp_dev->sync_min_period; |
| 1199 | esp_write(eregs->esp_stp, esp->prev_stp); |
| 1200 | if(esp->erev > esp100a) { |
| 1201 | esp->prev_cfg3 = esp->config3[target]; |
| 1202 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 1203 | } |
| 1204 | } |
| 1205 | i = (cmdp - esp->esp_command); |
| 1206 | |
| 1207 | /* Set up the DMA and ESP counters */ |
| 1208 | if(esp->do_pio_cmds){ |
| 1209 | int j = 0; |
| 1210 | |
| 1211 | /* |
| 1212 | * XXX MSch: |
| 1213 | * |
| 1214 | * It seems this is required, at least to clean up |
| 1215 | * after failed commands when using PIO mode ... |
| 1216 | */ |
| 1217 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 1218 | |
| 1219 | for(;j<i;j++) |
| 1220 | esp_write(eregs->esp_fdata, esp->esp_command[j]); |
| 1221 | the_esp_command &= ~ESP_CMD_DMA; |
| 1222 | |
| 1223 | /* Tell ESP to "go". */ |
| 1224 | esp_cmd(esp, eregs, the_esp_command); |
| 1225 | } else { |
| 1226 | /* Set up the ESP counters */ |
| 1227 | esp_write(eregs->esp_tclow, i); |
| 1228 | esp_write(eregs->esp_tcmed, 0); |
| 1229 | esp->dma_init_write(esp, esp->esp_command_dvma, i); |
| 1230 | |
| 1231 | /* Tell ESP to "go". */ |
| 1232 | esp_cmd(esp, eregs, the_esp_command); |
| 1233 | } |
| 1234 | } |
| 1235 | |
| 1236 | /* Queue a SCSI command delivered from the mid-level Linux SCSI code. */ |
| 1237 | int esp_queue(Scsi_Cmnd *SCpnt, void (*done)(Scsi_Cmnd *)) |
| 1238 | { |
| 1239 | struct NCR_ESP *esp; |
| 1240 | |
| 1241 | /* Set up func ptr and initial driver cmd-phase. */ |
| 1242 | SCpnt->scsi_done = done; |
| 1243 | SCpnt->SCp.phase = not_issued; |
| 1244 | |
| 1245 | esp = (struct NCR_ESP *) SCpnt->device->host->hostdata; |
| 1246 | |
| 1247 | if(esp->dma_led_on) |
| 1248 | esp->dma_led_on(esp); |
| 1249 | |
| 1250 | /* We use the scratch area. */ |
| 1251 | ESPQUEUE(("esp_queue: target=%d lun=%d ", SCpnt->device->id, SCpnt->lun)); |
| 1252 | ESPDISC(("N<%02x,%02x>", SCpnt->device->id, SCpnt->lun)); |
| 1253 | |
| 1254 | esp_get_dmabufs(esp, SCpnt); |
| 1255 | esp_save_pointers(esp, SCpnt); /* FIXME for tag queueing */ |
| 1256 | |
| 1257 | SCpnt->SCp.Status = CHECK_CONDITION; |
| 1258 | SCpnt->SCp.Message = 0xff; |
| 1259 | SCpnt->SCp.sent_command = 0; |
| 1260 | |
| 1261 | /* Place into our queue. */ |
| 1262 | if(SCpnt->cmnd[0] == REQUEST_SENSE) { |
| 1263 | ESPQUEUE(("RQSENSE\n")); |
| 1264 | prepend_SC(&esp->issue_SC, SCpnt); |
| 1265 | } else { |
| 1266 | ESPQUEUE(("\n")); |
| 1267 | append_SC(&esp->issue_SC, SCpnt); |
| 1268 | } |
| 1269 | |
| 1270 | /* Run it now if we can. */ |
| 1271 | if(!esp->current_SC && !esp->resetting_bus) |
| 1272 | esp_exec_cmd(esp); |
| 1273 | |
| 1274 | return 0; |
| 1275 | } |
| 1276 | |
| 1277 | /* Dump driver state. */ |
| 1278 | static void esp_dump_cmd(Scsi_Cmnd *SCptr) |
| 1279 | { |
| 1280 | ESPLOG(("[tgt<%02x> lun<%02x> " |
| 1281 | "pphase<%s> cphase<%s>]", |
| 1282 | SCptr->device->id, SCptr->device->lun, |
| 1283 | phase_string(SCptr->SCp.sent_command), |
| 1284 | phase_string(SCptr->SCp.phase))); |
| 1285 | } |
| 1286 | |
| 1287 | static void esp_dump_state(struct NCR_ESP *esp, |
| 1288 | struct ESP_regs *eregs) |
| 1289 | { |
| 1290 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 1291 | #ifdef DEBUG_ESP_CMDS |
| 1292 | int i; |
| 1293 | #endif |
| 1294 | |
| 1295 | ESPLOG(("esp%d: dumping state\n", esp->esp_id)); |
| 1296 | |
| 1297 | /* Print DMA status */ |
| 1298 | esp->dma_dump_state(esp); |
| 1299 | |
| 1300 | ESPLOG(("esp%d: SW [sreg<%02x> sstep<%02x> ireg<%02x>]\n", |
| 1301 | esp->esp_id, esp->sreg, esp->seqreg, esp->ireg)); |
| 1302 | ESPLOG(("esp%d: HW reread [sreg<%02x> sstep<%02x> ireg<%02x>]\n", |
| 1303 | esp->esp_id, esp_read(eregs->esp_status), esp_read(eregs->esp_sstep), |
| 1304 | esp_read(eregs->esp_intrpt))); |
| 1305 | #ifdef DEBUG_ESP_CMDS |
| 1306 | printk("esp%d: last ESP cmds [", esp->esp_id); |
| 1307 | i = (esp->espcmdent - 1) & 31; |
| 1308 | printk("<"); |
| 1309 | esp_print_cmd(esp->espcmdlog[i]); |
| 1310 | printk(">"); |
| 1311 | i = (i - 1) & 31; |
| 1312 | printk("<"); |
| 1313 | esp_print_cmd(esp->espcmdlog[i]); |
| 1314 | printk(">"); |
| 1315 | i = (i - 1) & 31; |
| 1316 | printk("<"); |
| 1317 | esp_print_cmd(esp->espcmdlog[i]); |
| 1318 | printk(">"); |
| 1319 | i = (i - 1) & 31; |
| 1320 | printk("<"); |
| 1321 | esp_print_cmd(esp->espcmdlog[i]); |
| 1322 | printk(">"); |
| 1323 | printk("]\n"); |
| 1324 | #endif /* (DEBUG_ESP_CMDS) */ |
| 1325 | |
| 1326 | if(SCptr) { |
| 1327 | ESPLOG(("esp%d: current command ", esp->esp_id)); |
| 1328 | esp_dump_cmd(SCptr); |
| 1329 | } |
| 1330 | ESPLOG(("\n")); |
| 1331 | SCptr = esp->disconnected_SC; |
| 1332 | ESPLOG(("esp%d: disconnected ", esp->esp_id)); |
| 1333 | while(SCptr) { |
| 1334 | esp_dump_cmd(SCptr); |
| 1335 | SCptr = (Scsi_Cmnd *) SCptr->host_scribble; |
| 1336 | } |
| 1337 | ESPLOG(("\n")); |
| 1338 | } |
| 1339 | |
| 1340 | /* Abort a command. The host_lock is acquired by caller. */ |
| 1341 | int esp_abort(Scsi_Cmnd *SCptr) |
| 1342 | { |
| 1343 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; |
| 1344 | struct ESP_regs *eregs = esp->eregs; |
| 1345 | int don; |
| 1346 | |
| 1347 | ESPLOG(("esp%d: Aborting command\n", esp->esp_id)); |
| 1348 | esp_dump_state(esp, eregs); |
| 1349 | |
| 1350 | /* Wheee, if this is the current command on the bus, the |
| 1351 | * best we can do is assert ATN and wait for msgout phase. |
| 1352 | * This should even fix a hung SCSI bus when we lose state |
| 1353 | * in the driver and timeout because the eventual phase change |
| 1354 | * will cause the ESP to (eventually) give an interrupt. |
| 1355 | */ |
| 1356 | if(esp->current_SC == SCptr) { |
| 1357 | esp->cur_msgout[0] = ABORT; |
| 1358 | esp->msgout_len = 1; |
| 1359 | esp->msgout_ctr = 0; |
| 1360 | esp_cmd(esp, eregs, ESP_CMD_SATN); |
| 1361 | return SUCCESS; |
| 1362 | } |
| 1363 | |
| 1364 | /* If it is still in the issue queue then we can safely |
| 1365 | * call the completion routine and report abort success. |
| 1366 | */ |
| 1367 | don = esp->dma_ports_p(esp); |
| 1368 | if(don) { |
| 1369 | esp->dma_ints_off(esp); |
| 1370 | synchronize_irq(esp->irq); |
| 1371 | } |
| 1372 | if(esp->issue_SC) { |
| 1373 | Scsi_Cmnd **prev, *this; |
| 1374 | for(prev = (&esp->issue_SC), this = esp->issue_SC; |
| 1375 | this; |
| 1376 | prev = (Scsi_Cmnd **) &(this->host_scribble), |
| 1377 | this = (Scsi_Cmnd *) this->host_scribble) { |
| 1378 | if(this == SCptr) { |
| 1379 | *prev = (Scsi_Cmnd *) this->host_scribble; |
| 1380 | this->host_scribble = NULL; |
| 1381 | esp_release_dmabufs(esp, this); |
| 1382 | this->result = DID_ABORT << 16; |
| 1383 | this->done(this); |
| 1384 | if(don) |
| 1385 | esp->dma_ints_on(esp); |
| 1386 | return SUCCESS; |
| 1387 | } |
| 1388 | } |
| 1389 | } |
| 1390 | |
| 1391 | /* Yuck, the command to abort is disconnected, it is not |
| 1392 | * worth trying to abort it now if something else is live |
| 1393 | * on the bus at this time. So, we let the SCSI code wait |
| 1394 | * a little bit and try again later. |
| 1395 | */ |
| 1396 | if(esp->current_SC) { |
| 1397 | if(don) |
| 1398 | esp->dma_ints_on(esp); |
| 1399 | return FAILED; |
| 1400 | } |
| 1401 | |
| 1402 | /* It's disconnected, we have to reconnect to re-establish |
| 1403 | * the nexus and tell the device to abort. However, we really |
| 1404 | * cannot 'reconnect' per se. Don't try to be fancy, just |
| 1405 | * indicate failure, which causes our caller to reset the whole |
| 1406 | * bus. |
| 1407 | */ |
| 1408 | |
| 1409 | if(don) |
| 1410 | esp->dma_ints_on(esp); |
| 1411 | return FAILED; |
| 1412 | } |
| 1413 | |
| 1414 | /* We've sent ESP_CMD_RS to the ESP, the interrupt had just |
| 1415 | * arrived indicating the end of the SCSI bus reset. Our job |
| 1416 | * is to clean out the command queues and begin re-execution |
| 1417 | * of SCSI commands once more. |
| 1418 | */ |
| 1419 | static int esp_finish_reset(struct NCR_ESP *esp, |
| 1420 | struct ESP_regs *eregs) |
| 1421 | { |
| 1422 | Scsi_Cmnd *sp = esp->current_SC; |
| 1423 | |
| 1424 | /* Clean up currently executing command, if any. */ |
| 1425 | if (sp != NULL) { |
| 1426 | esp_release_dmabufs(esp, sp); |
| 1427 | sp->result = (DID_RESET << 16); |
| 1428 | sp->scsi_done(sp); |
| 1429 | esp->current_SC = NULL; |
| 1430 | } |
| 1431 | |
| 1432 | /* Clean up disconnected queue, they have been invalidated |
| 1433 | * by the bus reset. |
| 1434 | */ |
| 1435 | if (esp->disconnected_SC) { |
| 1436 | while((sp = remove_first_SC(&esp->disconnected_SC)) != NULL) { |
| 1437 | esp_release_dmabufs(esp, sp); |
| 1438 | sp->result = (DID_RESET << 16); |
| 1439 | sp->scsi_done(sp); |
| 1440 | } |
| 1441 | } |
| 1442 | |
| 1443 | /* SCSI bus reset is complete. */ |
| 1444 | esp->resetting_bus = 0; |
| 1445 | wake_up(&esp->reset_queue); |
| 1446 | |
| 1447 | /* Ok, now it is safe to get commands going once more. */ |
| 1448 | if(esp->issue_SC) |
| 1449 | esp_exec_cmd(esp); |
| 1450 | |
| 1451 | return do_intr_end; |
| 1452 | } |
| 1453 | |
| 1454 | static int esp_do_resetbus(struct NCR_ESP *esp, |
| 1455 | struct ESP_regs *eregs) |
| 1456 | { |
| 1457 | ESPLOG(("esp%d: Resetting scsi bus\n", esp->esp_id)); |
| 1458 | esp->resetting_bus = 1; |
| 1459 | esp_cmd(esp, eregs, ESP_CMD_RS); |
| 1460 | |
| 1461 | return do_intr_end; |
| 1462 | } |
| 1463 | |
| 1464 | /* Reset ESP chip, reset hanging bus, then kill active and |
| 1465 | * disconnected commands for targets without soft reset. |
| 1466 | * |
| 1467 | * The host_lock is acquired by caller. |
| 1468 | */ |
| 1469 | int esp_reset(Scsi_Cmnd *SCptr) |
| 1470 | { |
| 1471 | struct NCR_ESP *esp = (struct NCR_ESP *) SCptr->device->host->hostdata; |
| 1472 | |
Jeff Garzik | 68b3aa7 | 2005-05-28 07:56:31 -0400 | [diff] [blame] | 1473 | spin_lock_irq(esp->ehost->host_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | (void) esp_do_resetbus(esp, esp->eregs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | spin_unlock_irq(esp->ehost->host_lock); |
| 1476 | |
| 1477 | wait_event(esp->reset_queue, (esp->resetting_bus == 0)); |
| 1478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | return SUCCESS; |
| 1480 | } |
| 1481 | |
| 1482 | /* Internal ESP done function. */ |
| 1483 | static void esp_done(struct NCR_ESP *esp, int error) |
| 1484 | { |
| 1485 | Scsi_Cmnd *done_SC; |
| 1486 | |
| 1487 | if(esp->current_SC) { |
| 1488 | done_SC = esp->current_SC; |
| 1489 | esp->current_SC = NULL; |
| 1490 | esp_release_dmabufs(esp, done_SC); |
| 1491 | done_SC->result = error; |
| 1492 | done_SC->scsi_done(done_SC); |
| 1493 | |
| 1494 | /* Bus is free, issue any commands in the queue. */ |
| 1495 | if(esp->issue_SC && !esp->current_SC) |
| 1496 | esp_exec_cmd(esp); |
| 1497 | } else { |
| 1498 | /* Panic is safe as current_SC is null so we may still |
| 1499 | * be able to accept more commands to sync disk buffers. |
| 1500 | */ |
| 1501 | ESPLOG(("panicing\n")); |
| 1502 | panic("esp: done() called with NULL esp->current_SC"); |
| 1503 | } |
| 1504 | } |
| 1505 | |
| 1506 | /* Wheee, ESP interrupt engine. */ |
| 1507 | |
| 1508 | /* Forward declarations. */ |
| 1509 | static int esp_do_phase_determine(struct NCR_ESP *esp, |
| 1510 | struct ESP_regs *eregs); |
| 1511 | static int esp_do_data_finale(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1512 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1513 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1514 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1515 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1516 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1517 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs); |
| 1518 | |
| 1519 | #define sreg_datainp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DIP) |
| 1520 | #define sreg_dataoutp(__sreg) (((__sreg) & ESP_STAT_PMASK) == ESP_DOP) |
| 1521 | |
| 1522 | /* We try to avoid some interrupts by jumping ahead and see if the ESP |
| 1523 | * has gotten far enough yet. Hence the following. |
| 1524 | */ |
| 1525 | static inline int skipahead1(struct NCR_ESP *esp, struct ESP_regs *eregs, |
| 1526 | Scsi_Cmnd *scp, int prev_phase, int new_phase) |
| 1527 | { |
| 1528 | if(scp->SCp.sent_command != prev_phase) |
| 1529 | return 0; |
| 1530 | |
| 1531 | if(esp->dma_irq_p(esp)) { |
| 1532 | /* Yes, we are able to save an interrupt. */ |
| 1533 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); |
| 1534 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 1535 | if(!(esp->ireg & ESP_INTR_SR)) |
| 1536 | return 0; |
| 1537 | else |
| 1538 | return do_reset_complete; |
| 1539 | } |
| 1540 | /* Ho hum, target is taking forever... */ |
| 1541 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ |
| 1542 | return do_intr_end; |
| 1543 | } |
| 1544 | |
| 1545 | static inline int skipahead2(struct NCR_ESP *esp, |
| 1546 | struct ESP_regs *eregs, |
| 1547 | Scsi_Cmnd *scp, int prev_phase1, int prev_phase2, |
| 1548 | int new_phase) |
| 1549 | { |
| 1550 | if(scp->SCp.sent_command != prev_phase1 && |
| 1551 | scp->SCp.sent_command != prev_phase2) |
| 1552 | return 0; |
| 1553 | if(esp->dma_irq_p(esp)) { |
| 1554 | /* Yes, we are able to save an interrupt. */ |
| 1555 | esp->sreg = (esp_read(eregs->esp_status) & ~(ESP_STAT_INTR)); |
| 1556 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 1557 | if(!(esp->ireg & ESP_INTR_SR)) |
| 1558 | return 0; |
| 1559 | else |
| 1560 | return do_reset_complete; |
| 1561 | } |
| 1562 | /* Ho hum, target is taking forever... */ |
| 1563 | scp->SCp.sent_command = new_phase; /* so we don't recurse... */ |
| 1564 | return do_intr_end; |
| 1565 | } |
| 1566 | |
| 1567 | /* Misc. esp helper macros. */ |
| 1568 | #define esp_setcount(__eregs, __cnt) \ |
| 1569 | esp_write((__eregs)->esp_tclow, ((__cnt) & 0xff)); \ |
| 1570 | esp_write((__eregs)->esp_tcmed, (((__cnt) >> 8) & 0xff)) |
| 1571 | |
| 1572 | #define esp_getcount(__eregs) \ |
| 1573 | ((esp_read((__eregs)->esp_tclow)&0xff) | \ |
| 1574 | ((esp_read((__eregs)->esp_tcmed)&0xff) << 8)) |
| 1575 | |
| 1576 | #define fcount(__esp, __eregs) \ |
| 1577 | (esp_read((__eregs)->esp_fflags) & ESP_FF_FBYTES) |
| 1578 | |
| 1579 | #define fnzero(__esp, __eregs) \ |
| 1580 | (esp_read((__eregs)->esp_fflags) & ESP_FF_ONOTZERO) |
| 1581 | |
| 1582 | /* XXX speculative nops unnecessary when continuing amidst a data phase |
| 1583 | * XXX even on esp100!!! another case of flooding the bus with I/O reg |
| 1584 | * XXX writes... |
| 1585 | */ |
| 1586 | #define esp_maybe_nop(__esp, __eregs) \ |
| 1587 | if((__esp)->erev == esp100) \ |
| 1588 | esp_cmd((__esp), (__eregs), ESP_CMD_NULL) |
| 1589 | |
| 1590 | #define sreg_to_dataphase(__sreg) \ |
| 1591 | ((((__sreg) & ESP_STAT_PMASK) == ESP_DOP) ? in_dataout : in_datain) |
| 1592 | |
| 1593 | /* The ESP100 when in synchronous data phase, can mistake a long final |
| 1594 | * REQ pulse from the target as an extra byte, it places whatever is on |
| 1595 | * the data lines into the fifo. For now, we will assume when this |
| 1596 | * happens that the target is a bit quirky and we don't want to |
| 1597 | * be talking synchronously to it anyways. Regardless, we need to |
| 1598 | * tell the ESP to eat the extraneous byte so that we can proceed |
| 1599 | * to the next phase. |
| 1600 | */ |
| 1601 | static inline int esp100_sync_hwbug(struct NCR_ESP *esp, struct ESP_regs *eregs, |
| 1602 | Scsi_Cmnd *sp, int fifocnt) |
| 1603 | { |
| 1604 | /* Do not touch this piece of code. */ |
| 1605 | if((!(esp->erev == esp100)) || |
| 1606 | (!(sreg_datainp((esp->sreg = esp_read(eregs->esp_status))) && !fifocnt) && |
| 1607 | !(sreg_dataoutp(esp->sreg) && !fnzero(esp, eregs)))) { |
| 1608 | if(sp->SCp.phase == in_dataout) |
| 1609 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 1610 | return 0; |
| 1611 | } else { |
| 1612 | /* Async mode for this guy. */ |
| 1613 | build_sync_nego_msg(esp, 0, 0); |
| 1614 | |
| 1615 | /* Ack the bogus byte, but set ATN first. */ |
| 1616 | esp_cmd(esp, eregs, ESP_CMD_SATN); |
| 1617 | esp_cmd(esp, eregs, ESP_CMD_MOK); |
| 1618 | return 1; |
| 1619 | } |
| 1620 | } |
| 1621 | |
| 1622 | /* This closes the window during a selection with a reselect pending, because |
| 1623 | * we use DMA for the selection process the FIFO should hold the correct |
| 1624 | * contents if we get reselected during this process. So we just need to |
| 1625 | * ack the possible illegal cmd interrupt pending on the esp100. |
| 1626 | */ |
| 1627 | static inline int esp100_reconnect_hwbug(struct NCR_ESP *esp, |
| 1628 | struct ESP_regs *eregs) |
| 1629 | { |
| 1630 | volatile unchar junk; |
| 1631 | |
| 1632 | if(esp->erev != esp100) |
| 1633 | return 0; |
| 1634 | junk = esp_read(eregs->esp_intrpt); |
| 1635 | |
| 1636 | if(junk & ESP_INTR_SR) |
| 1637 | return 1; |
| 1638 | return 0; |
| 1639 | } |
| 1640 | |
| 1641 | /* This verifies the BUSID bits during a reselection so that we know which |
| 1642 | * target is talking to us. |
| 1643 | */ |
| 1644 | static inline int reconnect_target(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 1645 | { |
| 1646 | int it, me = esp->scsi_id_mask, targ = 0; |
| 1647 | |
| 1648 | if(2 != fcount(esp, eregs)) |
| 1649 | return -1; |
| 1650 | it = esp_read(eregs->esp_fdata); |
| 1651 | if(!(it & me)) |
| 1652 | return -1; |
| 1653 | it &= ~me; |
| 1654 | if(it & (it - 1)) |
| 1655 | return -1; |
| 1656 | while(!(it & 1)) |
| 1657 | targ++, it >>= 1; |
| 1658 | return targ; |
| 1659 | } |
| 1660 | |
| 1661 | /* This verifies the identify from the target so that we know which lun is |
| 1662 | * being reconnected. |
| 1663 | */ |
| 1664 | static inline int reconnect_lun(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 1665 | { |
| 1666 | int lun; |
| 1667 | |
| 1668 | if((esp->sreg & ESP_STAT_PMASK) != ESP_MIP) |
| 1669 | return -1; |
| 1670 | lun = esp_read(eregs->esp_fdata); |
| 1671 | |
| 1672 | /* Yes, you read this correctly. We report lun of zero |
| 1673 | * if we see parity error. ESP reports parity error for |
| 1674 | * the lun byte, and this is the only way to hope to recover |
| 1675 | * because the target is connected. |
| 1676 | */ |
| 1677 | if(esp->sreg & ESP_STAT_PERR) |
| 1678 | return 0; |
| 1679 | |
| 1680 | /* Check for illegal bits being set in the lun. */ |
| 1681 | if((lun & 0x40) || !(lun & 0x80)) |
| 1682 | return -1; |
| 1683 | |
| 1684 | return lun & 7; |
| 1685 | } |
| 1686 | |
| 1687 | /* This puts the driver in a state where it can revitalize a command that |
| 1688 | * is being continued due to reselection. |
| 1689 | */ |
| 1690 | static inline void esp_connect(struct NCR_ESP *esp, struct ESP_regs *eregs, |
| 1691 | Scsi_Cmnd *sp) |
| 1692 | { |
Christoph Hellwig | f64a181 | 2005-10-31 18:32:08 +0100 | [diff] [blame] | 1693 | struct scsi_device *dp = sp->device; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | struct esp_device *esp_dev = dp->hostdata; |
| 1695 | |
| 1696 | if(esp->prev_soff != esp_dev->sync_max_offset || |
| 1697 | esp->prev_stp != esp_dev->sync_min_period || |
| 1698 | (esp->erev > esp100a && |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1699 | esp->prev_cfg3 != esp->config3[scmd_id(sp)])) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1700 | esp->prev_soff = esp_dev->sync_max_offset; |
| 1701 | esp_write(eregs->esp_soff, esp->prev_soff); |
| 1702 | esp->prev_stp = esp_dev->sync_min_period; |
| 1703 | esp_write(eregs->esp_stp, esp->prev_stp); |
| 1704 | if(esp->erev > esp100a) { |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 1705 | esp->prev_cfg3 = esp->config3[scmd_id(sp)]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 1707 | } |
| 1708 | } |
| 1709 | esp->current_SC = sp; |
| 1710 | } |
| 1711 | |
| 1712 | /* This will place the current working command back into the issue queue |
| 1713 | * if we are to receive a reselection amidst a selection attempt. |
| 1714 | */ |
| 1715 | static inline void esp_reconnect(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 1716 | { |
| 1717 | if(!esp->disconnected_SC) |
| 1718 | ESPLOG(("esp%d: Weird, being reselected but disconnected " |
| 1719 | "command queue is empty.\n", esp->esp_id)); |
| 1720 | esp->snip = 0; |
| 1721 | esp->current_SC = NULL; |
| 1722 | sp->SCp.phase = not_issued; |
| 1723 | append_SC(&esp->issue_SC, sp); |
| 1724 | } |
| 1725 | |
| 1726 | /* Begin message in phase. */ |
| 1727 | static int esp_do_msgin(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 1728 | { |
| 1729 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 1730 | esp_maybe_nop(esp, eregs); |
| 1731 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 1732 | esp->msgin_len = 1; |
| 1733 | esp->msgin_ctr = 0; |
| 1734 | esp_advance_phase(esp->current_SC, in_msgindone); |
| 1735 | return do_work_bus; |
| 1736 | } |
| 1737 | |
| 1738 | static inline void advance_sg(struct NCR_ESP *esp, Scsi_Cmnd *sp) |
| 1739 | { |
| 1740 | ++sp->SCp.buffer; |
| 1741 | --sp->SCp.buffers_residual; |
| 1742 | sp->SCp.this_residual = sp->SCp.buffer->length; |
| 1743 | if (esp->dma_advance_sg) |
| 1744 | esp->dma_advance_sg (sp); |
| 1745 | else |
| 1746 | sp->SCp.ptr = (char *) virt_to_phys((page_address(sp->SCp.buffer->page) + sp->SCp.buffer->offset)); |
| 1747 | |
| 1748 | } |
| 1749 | |
| 1750 | /* Please note that the way I've coded these routines is that I _always_ |
| 1751 | * check for a disconnect during any and all information transfer |
| 1752 | * phases. The SCSI standard states that the target _can_ cause a BUS |
| 1753 | * FREE condition by dropping all MSG/CD/IO/BSY signals. Also note |
| 1754 | * that during information transfer phases the target controls every |
| 1755 | * change in phase, the only thing the initiator can do is "ask" for |
| 1756 | * a message out phase by driving ATN true. The target can, and sometimes |
| 1757 | * will, completely ignore this request so we cannot assume anything when |
| 1758 | * we try to force a message out phase to abort/reset a target. Most of |
| 1759 | * the time the target will eventually be nice and go to message out, so |
| 1760 | * we may have to hold on to our state about what we want to tell the target |
| 1761 | * for some period of time. |
| 1762 | */ |
| 1763 | |
| 1764 | /* I think I have things working here correctly. Even partial transfers |
| 1765 | * within a buffer or sub-buffer should not upset us at all no matter |
| 1766 | * how bad the target and/or ESP fucks things up. |
| 1767 | */ |
| 1768 | static int esp_do_data(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 1769 | { |
| 1770 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 1771 | int thisphase, hmuch; |
| 1772 | |
| 1773 | ESPDATA(("esp_do_data: ")); |
| 1774 | esp_maybe_nop(esp, eregs); |
| 1775 | thisphase = sreg_to_dataphase(esp->sreg); |
| 1776 | esp_advance_phase(SCptr, thisphase); |
| 1777 | ESPDATA(("newphase<%s> ", (thisphase == in_datain) ? "DATAIN" : "DATAOUT")); |
| 1778 | hmuch = esp->dma_can_transfer(esp, SCptr); |
| 1779 | |
| 1780 | /* |
| 1781 | * XXX MSch: cater for PIO transfer here; PIO used if hmuch == 0 |
| 1782 | */ |
| 1783 | if (hmuch) { /* DMA */ |
| 1784 | /* |
| 1785 | * DMA |
| 1786 | */ |
| 1787 | ESPDATA(("hmuch<%d> ", hmuch)); |
| 1788 | esp->current_transfer_size = hmuch; |
| 1789 | esp_setcount(eregs, (esp->fas_premature_intr_workaround ? |
| 1790 | (hmuch + 0x40) : hmuch)); |
| 1791 | esp->dma_setup(esp, (__u32)((unsigned long)SCptr->SCp.ptr), |
| 1792 | hmuch, (thisphase == in_datain)); |
| 1793 | ESPDATA(("DMA|TI --> do_intr_end\n")); |
| 1794 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); |
| 1795 | return do_intr_end; |
| 1796 | /* |
| 1797 | * end DMA |
| 1798 | */ |
| 1799 | } else { |
| 1800 | /* |
| 1801 | * PIO |
| 1802 | */ |
| 1803 | int oldphase, i = 0; /* or where we left off last time ?? esp->current_data ?? */ |
| 1804 | int fifocnt = 0; |
Al Viro | 3c9757b | 2006-01-12 01:06:40 -0800 | [diff] [blame] | 1805 | unsigned char *p = phys_to_virt((unsigned long)SCptr->SCp.ptr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | |
| 1807 | oldphase = esp_read(eregs->esp_status) & ESP_STAT_PMASK; |
| 1808 | |
| 1809 | /* |
| 1810 | * polled transfer; ugly, can we make this happen in a DRQ |
| 1811 | * interrupt handler ?? |
| 1812 | * requires keeping track of state information in host or |
| 1813 | * command struct! |
| 1814 | * Problem: I've never seen a DRQ happen on Mac, not even |
| 1815 | * with ESP_CMD_DMA ... |
| 1816 | */ |
| 1817 | |
| 1818 | /* figure out how much needs to be transferred */ |
| 1819 | hmuch = SCptr->SCp.this_residual; |
| 1820 | ESPDATA(("hmuch<%d> pio ", hmuch)); |
| 1821 | esp->current_transfer_size = hmuch; |
| 1822 | |
| 1823 | /* tell the ESP ... */ |
| 1824 | esp_setcount(eregs, hmuch); |
| 1825 | |
| 1826 | /* loop */ |
| 1827 | while (hmuch) { |
| 1828 | int j, fifo_stuck = 0, newphase; |
Adrian Bunk | cad359c | 2005-05-05 16:16:18 -0700 | [diff] [blame] | 1829 | unsigned long timeout; |
| 1830 | #if 0 |
| 1831 | unsigned long flags; |
| 1832 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1833 | #if 0 |
| 1834 | if ( i % 10 ) |
| 1835 | ESPDATA(("\r")); |
| 1836 | else |
| 1837 | ESPDATA(( /*"\n"*/ "\r")); |
| 1838 | #endif |
| 1839 | #if 0 |
| 1840 | local_irq_save(flags); |
| 1841 | #endif |
| 1842 | if(thisphase == in_datain) { |
| 1843 | /* 'go' ... */ |
| 1844 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 1845 | |
| 1846 | /* wait for data */ |
| 1847 | timeout = 1000000; |
| 1848 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) |
| 1849 | udelay(2); |
| 1850 | if (timeout == 0) |
| 1851 | printk("DRQ datain timeout! \n"); |
| 1852 | |
| 1853 | newphase = esp->sreg & ESP_STAT_PMASK; |
| 1854 | |
| 1855 | /* see how much we got ... */ |
| 1856 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); |
| 1857 | |
| 1858 | if (!fifocnt) |
| 1859 | fifo_stuck++; |
| 1860 | else |
| 1861 | fifo_stuck = 0; |
| 1862 | |
| 1863 | ESPDATA(("\rgot %d st %x ph %x", fifocnt, esp->sreg, newphase)); |
| 1864 | |
| 1865 | /* read fifo */ |
| 1866 | for(j=0;j<fifocnt;j++) |
Al Viro | 3c9757b | 2006-01-12 01:06:40 -0800 | [diff] [blame] | 1867 | p[i++] = esp_read(eregs->esp_fdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1868 | |
| 1869 | ESPDATA(("(%d) ", i)); |
| 1870 | |
| 1871 | /* how many to go ?? */ |
| 1872 | hmuch -= fifocnt; |
| 1873 | |
| 1874 | /* break if status phase !! */ |
| 1875 | if(newphase == ESP_STATP) { |
| 1876 | /* clear int. */ |
| 1877 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 1878 | break; |
| 1879 | } |
| 1880 | } else { |
| 1881 | #define MAX_FIFO 8 |
| 1882 | /* how much will fit ? */ |
| 1883 | int this_count = MAX_FIFO - fifocnt; |
| 1884 | if (this_count > hmuch) |
| 1885 | this_count = hmuch; |
| 1886 | |
| 1887 | /* fill fifo */ |
| 1888 | for(j=0;j<this_count;j++) |
Al Viro | 3c9757b | 2006-01-12 01:06:40 -0800 | [diff] [blame] | 1889 | esp_write(eregs->esp_fdata, p[i++]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | |
| 1891 | /* how many left if this goes out ?? */ |
| 1892 | hmuch -= this_count; |
| 1893 | |
| 1894 | /* 'go' ... */ |
| 1895 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 1896 | |
| 1897 | /* wait for 'got it' */ |
| 1898 | timeout = 1000000; |
| 1899 | while (!((esp->sreg=esp_read(eregs->esp_status)) & ESP_STAT_INTR) && --timeout) |
| 1900 | udelay(2); |
| 1901 | if (timeout == 0) |
| 1902 | printk("DRQ dataout timeout! \n"); |
| 1903 | |
| 1904 | newphase = esp->sreg & ESP_STAT_PMASK; |
| 1905 | |
| 1906 | /* need to check how much was sent ?? */ |
| 1907 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); |
| 1908 | |
| 1909 | ESPDATA(("\rsent %d st %x ph %x", this_count - fifocnt, esp->sreg, newphase)); |
| 1910 | |
| 1911 | ESPDATA(("(%d) ", i)); |
| 1912 | |
| 1913 | /* break if status phase !! */ |
| 1914 | if(newphase == ESP_STATP) { |
| 1915 | /* clear int. */ |
| 1916 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 1917 | break; |
| 1918 | } |
| 1919 | |
| 1920 | } |
| 1921 | |
| 1922 | /* clear int. */ |
| 1923 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 1924 | |
| 1925 | ESPDATA(("ir %x ... ", esp->ireg)); |
| 1926 | |
| 1927 | if (hmuch == 0) |
| 1928 | ESPDATA(("done! \n")); |
| 1929 | |
| 1930 | #if 0 |
| 1931 | local_irq_restore(flags); |
| 1932 | #endif |
| 1933 | |
| 1934 | /* check new bus phase */ |
| 1935 | if (newphase != oldphase && i < esp->current_transfer_size) { |
| 1936 | /* something happened; disconnect ?? */ |
| 1937 | ESPDATA(("phase change, dropped out with %d done ... ", i)); |
| 1938 | break; |
| 1939 | } |
| 1940 | |
| 1941 | /* check int. status */ |
| 1942 | if (esp->ireg & ESP_INTR_DC) { |
| 1943 | /* disconnect */ |
| 1944 | ESPDATA(("disconnect; %d transferred ... ", i)); |
| 1945 | break; |
| 1946 | } else if (esp->ireg & ESP_INTR_FDONE) { |
| 1947 | /* function done */ |
| 1948 | ESPDATA(("function done; %d transferred ... ", i)); |
| 1949 | break; |
| 1950 | } |
| 1951 | |
| 1952 | /* XXX fixme: bail out on stall */ |
| 1953 | if (fifo_stuck > 10) { |
| 1954 | /* we're stuck */ |
| 1955 | ESPDATA(("fifo stall; %d transferred ... ", i)); |
| 1956 | break; |
| 1957 | } |
| 1958 | } |
| 1959 | |
| 1960 | ESPDATA(("\n")); |
| 1961 | /* check successful completion ?? */ |
| 1962 | |
| 1963 | if (thisphase == in_dataout) |
| 1964 | hmuch += fifocnt; /* stuck?? adjust data pointer ...*/ |
| 1965 | |
| 1966 | /* tell do_data_finale how much was transferred */ |
| 1967 | esp->current_transfer_size -= hmuch; |
| 1968 | |
| 1969 | /* still not completely sure on this one ... */ |
| 1970 | return /*do_intr_end*/ do_work_bus /*do_phase_determine*/ ; |
| 1971 | |
| 1972 | /* |
| 1973 | * end PIO |
| 1974 | */ |
| 1975 | } |
| 1976 | return do_intr_end; |
| 1977 | } |
| 1978 | |
| 1979 | /* See how successful the data transfer was. */ |
| 1980 | static int esp_do_data_finale(struct NCR_ESP *esp, |
| 1981 | struct ESP_regs *eregs) |
| 1982 | { |
| 1983 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 1984 | struct esp_device *esp_dev = SCptr->device->hostdata; |
| 1985 | int bogus_data = 0, bytes_sent = 0, fifocnt, ecount = 0; |
| 1986 | |
| 1987 | if(esp->dma_led_off) |
| 1988 | esp->dma_led_off(esp); |
| 1989 | |
| 1990 | ESPDATA(("esp_do_data_finale: ")); |
| 1991 | |
| 1992 | if(SCptr->SCp.phase == in_datain) { |
| 1993 | if(esp->sreg & ESP_STAT_PERR) { |
| 1994 | /* Yuck, parity error. The ESP asserts ATN |
| 1995 | * so that we can go to message out phase |
| 1996 | * immediately and inform the target that |
| 1997 | * something bad happened. |
| 1998 | */ |
| 1999 | ESPLOG(("esp%d: data bad parity detected.\n", |
| 2000 | esp->esp_id)); |
| 2001 | esp->cur_msgout[0] = INITIATOR_ERROR; |
| 2002 | esp->msgout_len = 1; |
| 2003 | } |
| 2004 | if(esp->dma_drain) |
| 2005 | esp->dma_drain(esp); |
| 2006 | } |
| 2007 | if(esp->dma_invalidate) |
| 2008 | esp->dma_invalidate(esp); |
| 2009 | |
| 2010 | /* This could happen for the above parity error case. */ |
| 2011 | if(!(esp->ireg == ESP_INTR_BSERV)) { |
| 2012 | /* Please go to msgout phase, please please please... */ |
| 2013 | ESPLOG(("esp%d: !BSERV after data, probably to msgout\n", |
| 2014 | esp->esp_id)); |
| 2015 | return esp_do_phase_determine(esp, eregs); |
| 2016 | } |
| 2017 | |
| 2018 | /* Check for partial transfers and other horrible events. */ |
| 2019 | fifocnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); |
| 2020 | ecount = esp_getcount(eregs); |
| 2021 | if(esp->fas_premature_intr_workaround) |
| 2022 | ecount -= 0x40; |
| 2023 | bytes_sent = esp->current_transfer_size; |
| 2024 | |
| 2025 | ESPDATA(("trans_sz=%d, ", bytes_sent)); |
| 2026 | if(!(esp->sreg & ESP_STAT_TCNT)) |
| 2027 | bytes_sent -= ecount; |
| 2028 | if(SCptr->SCp.phase == in_dataout) |
| 2029 | bytes_sent -= fifocnt; |
| 2030 | |
| 2031 | ESPDATA(("bytes_sent=%d (ecount=%d, fifocnt=%d), ", bytes_sent, |
| 2032 | ecount, fifocnt)); |
| 2033 | |
| 2034 | /* If we were in synchronous mode, check for peculiarities. */ |
| 2035 | if(esp_dev->sync_max_offset) |
| 2036 | bogus_data = esp100_sync_hwbug(esp, eregs, SCptr, fifocnt); |
| 2037 | else |
| 2038 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 2039 | |
| 2040 | /* Until we are sure of what has happened, we are certainly |
| 2041 | * in the dark. |
| 2042 | */ |
| 2043 | esp_advance_phase(SCptr, in_the_dark); |
| 2044 | |
| 2045 | /* Check for premature interrupt condition. Can happen on FAS2x6 |
| 2046 | * chips. QLogic recommends a workaround by overprogramming the |
| 2047 | * transfer counters, but this makes doing scatter-gather impossible. |
| 2048 | * Until there is a way to disable scatter-gather for a single target, |
| 2049 | * and not only for the entire host adapter as it is now, the workaround |
| 2050 | * is way to expensive performance wise. |
| 2051 | * Instead, it turns out that when this happens the target has disconnected |
| 2052 | * already but it doesn't show in the interrupt register. Compensate for |
| 2053 | * that here to try and avoid a SCSI bus reset. |
| 2054 | */ |
| 2055 | if(!esp->fas_premature_intr_workaround && (fifocnt == 1) && |
| 2056 | sreg_dataoutp(esp->sreg)) { |
| 2057 | ESPLOG(("esp%d: Premature interrupt, enabling workaround\n", |
| 2058 | esp->esp_id)); |
| 2059 | #if 0 |
| 2060 | /* Disable scatter-gather operations, they are not possible |
| 2061 | * when using this workaround. |
| 2062 | */ |
| 2063 | esp->ehost->sg_tablesize = 0; |
| 2064 | esp->ehost->use_clustering = ENABLE_CLUSTERING; |
| 2065 | esp->fas_premature_intr_workaround = 1; |
| 2066 | bytes_sent = 0; |
| 2067 | if(SCptr->use_sg) { |
| 2068 | ESPLOG(("esp%d: Aborting scatter-gather operation\n", |
| 2069 | esp->esp_id)); |
| 2070 | esp->cur_msgout[0] = ABORT; |
| 2071 | esp->msgout_len = 1; |
| 2072 | esp->msgout_ctr = 0; |
| 2073 | esp_cmd(esp, eregs, ESP_CMD_SATN); |
| 2074 | esp_setcount(eregs, 0xffff); |
| 2075 | esp_cmd(esp, eregs, ESP_CMD_NULL); |
| 2076 | esp_cmd(esp, eregs, ESP_CMD_TPAD | ESP_CMD_DMA); |
| 2077 | return do_intr_end; |
| 2078 | } |
| 2079 | #else |
| 2080 | /* Just set the disconnected bit. That's what appears to |
| 2081 | * happen anyway. The state machine will pick it up when |
| 2082 | * we return. |
| 2083 | */ |
| 2084 | esp->ireg |= ESP_INTR_DC; |
| 2085 | #endif |
| 2086 | } |
| 2087 | |
| 2088 | if(bytes_sent < 0) { |
| 2089 | /* I've seen this happen due to lost state in this |
| 2090 | * driver. No idea why it happened, but allowing |
| 2091 | * this value to be negative caused things to |
| 2092 | * lock up. This allows greater chance of recovery. |
| 2093 | * In fact every time I've seen this, it has been |
| 2094 | * a driver bug without question. |
| 2095 | */ |
| 2096 | ESPLOG(("esp%d: yieee, bytes_sent < 0!\n", esp->esp_id)); |
| 2097 | ESPLOG(("esp%d: csz=%d fifocount=%d ecount=%d\n", |
| 2098 | esp->esp_id, |
| 2099 | esp->current_transfer_size, fifocnt, ecount)); |
| 2100 | ESPLOG(("esp%d: use_sg=%d ptr=%p this_residual=%d\n", |
| 2101 | esp->esp_id, |
| 2102 | SCptr->use_sg, SCptr->SCp.ptr, SCptr->SCp.this_residual)); |
| 2103 | ESPLOG(("esp%d: Forcing async for target %d\n", esp->esp_id, |
| 2104 | SCptr->device->id)); |
| 2105 | SCptr->device->borken = 1; |
| 2106 | esp_dev->sync = 0; |
| 2107 | bytes_sent = 0; |
| 2108 | } |
| 2109 | |
| 2110 | /* Update the state of our transfer. */ |
| 2111 | SCptr->SCp.ptr += bytes_sent; |
| 2112 | SCptr->SCp.this_residual -= bytes_sent; |
| 2113 | if(SCptr->SCp.this_residual < 0) { |
| 2114 | /* shit */ |
| 2115 | ESPLOG(("esp%d: Data transfer overrun.\n", esp->esp_id)); |
| 2116 | SCptr->SCp.this_residual = 0; |
| 2117 | } |
| 2118 | |
| 2119 | /* Maybe continue. */ |
| 2120 | if(!bogus_data) { |
| 2121 | ESPDATA(("!bogus_data, ")); |
| 2122 | /* NO MATTER WHAT, we advance the scatterlist, |
| 2123 | * if the target should decide to disconnect |
| 2124 | * in between scatter chunks (which is common) |
| 2125 | * we could die horribly! I used to have the sg |
| 2126 | * advance occur only if we are going back into |
| 2127 | * (or are staying in) a data phase, you can |
| 2128 | * imagine the hell I went through trying to |
| 2129 | * figure this out. |
| 2130 | */ |
| 2131 | if(!SCptr->SCp.this_residual && SCptr->SCp.buffers_residual) |
| 2132 | advance_sg(esp, SCptr); |
| 2133 | #ifdef DEBUG_ESP_DATA |
| 2134 | if(sreg_datainp(esp->sreg) || sreg_dataoutp(esp->sreg)) { |
| 2135 | ESPDATA(("to more data\n")); |
| 2136 | } else { |
| 2137 | ESPDATA(("to new phase\n")); |
| 2138 | } |
| 2139 | #endif |
| 2140 | return esp_do_phase_determine(esp, eregs); |
| 2141 | } |
| 2142 | /* Bogus data, just wait for next interrupt. */ |
| 2143 | ESPLOG(("esp%d: bogus_data during end of data phase\n", |
| 2144 | esp->esp_id)); |
| 2145 | return do_intr_end; |
| 2146 | } |
| 2147 | |
| 2148 | /* We received a non-good status return at the end of |
| 2149 | * running a SCSI command. This is used to decide if |
| 2150 | * we should clear our synchronous transfer state for |
| 2151 | * such a device when that happens. |
| 2152 | * |
| 2153 | * The idea is that when spinning up a disk or rewinding |
| 2154 | * a tape, we don't want to go into a loop re-negotiating |
| 2155 | * synchronous capabilities over and over. |
| 2156 | */ |
| 2157 | static int esp_should_clear_sync(Scsi_Cmnd *sp) |
| 2158 | { |
Christoph Hellwig | 6482132 | 2006-07-26 09:53:23 +0200 | [diff] [blame] | 2159 | unchar cmd = sp->cmnd[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
| 2161 | /* These cases are for spinning up a disk and |
| 2162 | * waiting for that spinup to complete. |
| 2163 | */ |
Christoph Hellwig | 6482132 | 2006-07-26 09:53:23 +0200 | [diff] [blame] | 2164 | if(cmd == START_STOP) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | return 0; |
| 2166 | |
Christoph Hellwig | 6482132 | 2006-07-26 09:53:23 +0200 | [diff] [blame] | 2167 | if(cmd == TEST_UNIT_READY) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | return 0; |
| 2169 | |
| 2170 | /* One more special case for SCSI tape drives, |
| 2171 | * this is what is used to probe the device for |
| 2172 | * completion of a rewind or tape load operation. |
| 2173 | */ |
Christoph Hellwig | 6482132 | 2006-07-26 09:53:23 +0200 | [diff] [blame] | 2174 | if(sp->device->type == TYPE_TAPE && cmd == MODE_SENSE) |
| 2175 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2176 | |
| 2177 | return 1; |
| 2178 | } |
| 2179 | |
| 2180 | /* Either a command is completing or a target is dropping off the bus |
| 2181 | * to continue the command in the background so we can do other work. |
| 2182 | */ |
| 2183 | static int esp_do_freebus(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 2184 | { |
| 2185 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 2186 | int rval; |
| 2187 | |
| 2188 | rval = skipahead2(esp, eregs, SCptr, in_status, in_msgindone, in_freeing); |
| 2189 | if(rval) |
| 2190 | return rval; |
| 2191 | |
| 2192 | if(esp->ireg != ESP_INTR_DC) { |
| 2193 | ESPLOG(("esp%d: Target will not disconnect\n", esp->esp_id)); |
| 2194 | return do_reset_bus; /* target will not drop BSY... */ |
| 2195 | } |
| 2196 | esp->msgout_len = 0; |
| 2197 | esp->prevmsgout = NOP; |
| 2198 | if(esp->prevmsgin == COMMAND_COMPLETE) { |
| 2199 | struct esp_device *esp_dev = SCptr->device->hostdata; |
| 2200 | /* Normal end of nexus. */ |
| 2201 | if(esp->disconnected_SC) |
| 2202 | esp_cmd(esp, eregs, ESP_CMD_ESEL); |
| 2203 | |
| 2204 | if(SCptr->SCp.Status != GOOD && |
| 2205 | SCptr->SCp.Status != CONDITION_GOOD && |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 2206 | ((1<<scmd_id(SCptr)) & esp->targets_present) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | esp_dev->sync && esp_dev->sync_max_offset) { |
| 2208 | /* SCSI standard says that the synchronous capabilities |
| 2209 | * should be renegotiated at this point. Most likely |
| 2210 | * we are about to request sense from this target |
| 2211 | * in which case we want to avoid using sync |
| 2212 | * transfers until we are sure of the current target |
| 2213 | * state. |
| 2214 | */ |
| 2215 | ESPMISC(("esp: Status <%d> for target %d lun %d\n", |
| 2216 | SCptr->SCp.Status, SCptr->device->id, SCptr->device->lun)); |
| 2217 | |
| 2218 | /* But don't do this when spinning up a disk at |
| 2219 | * boot time while we poll for completion as it |
| 2220 | * fills up the console with messages. Also, tapes |
| 2221 | * can report not ready many times right after |
| 2222 | * loading up a tape. |
| 2223 | */ |
| 2224 | if(esp_should_clear_sync(SCptr) != 0) |
| 2225 | esp_dev->sync = 0; |
| 2226 | } |
| 2227 | ESPDISC(("F<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); |
| 2228 | esp_done(esp, ((SCptr->SCp.Status & 0xff) | |
| 2229 | ((SCptr->SCp.Message & 0xff)<<8) | |
| 2230 | (DID_OK << 16))); |
| 2231 | } else if(esp->prevmsgin == DISCONNECT) { |
| 2232 | /* Normal disconnect. */ |
| 2233 | esp_cmd(esp, eregs, ESP_CMD_ESEL); |
| 2234 | ESPDISC(("D<%02x,%02x>", SCptr->device->id, SCptr->device->lun)); |
| 2235 | append_SC(&esp->disconnected_SC, SCptr); |
| 2236 | esp->current_SC = NULL; |
| 2237 | if(esp->issue_SC) |
| 2238 | esp_exec_cmd(esp); |
| 2239 | } else { |
| 2240 | /* Driver bug, we do not expect a disconnect here |
| 2241 | * and should not have advanced the state engine |
| 2242 | * to in_freeing. |
| 2243 | */ |
| 2244 | ESPLOG(("esp%d: last msg not disc and not cmd cmplt.\n", |
| 2245 | esp->esp_id)); |
| 2246 | return do_reset_bus; |
| 2247 | } |
| 2248 | return do_intr_end; |
| 2249 | } |
| 2250 | |
| 2251 | /* When a reselect occurs, and we cannot find the command to |
| 2252 | * reconnect to in our queues, we do this. |
| 2253 | */ |
| 2254 | static int esp_bad_reconnect(struct NCR_ESP *esp) |
| 2255 | { |
| 2256 | Scsi_Cmnd *sp; |
| 2257 | |
| 2258 | ESPLOG(("esp%d: Eieeee, reconnecting unknown command!\n", |
| 2259 | esp->esp_id)); |
| 2260 | ESPLOG(("QUEUE DUMP\n")); |
| 2261 | sp = esp->issue_SC; |
| 2262 | ESPLOG(("esp%d: issue_SC[", esp->esp_id)); |
| 2263 | while(sp) { |
| 2264 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); |
| 2265 | sp = (Scsi_Cmnd *) sp->host_scribble; |
| 2266 | } |
| 2267 | ESPLOG(("]\n")); |
| 2268 | sp = esp->current_SC; |
| 2269 | ESPLOG(("esp%d: current_SC[", esp->esp_id)); |
| 2270 | while(sp) { |
| 2271 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); |
| 2272 | sp = (Scsi_Cmnd *) sp->host_scribble; |
| 2273 | } |
| 2274 | ESPLOG(("]\n")); |
| 2275 | sp = esp->disconnected_SC; |
| 2276 | ESPLOG(("esp%d: disconnected_SC[", esp->esp_id)); |
| 2277 | while(sp) { |
| 2278 | ESPLOG(("<%02x,%02x>", sp->device->id, sp->device->lun)); |
| 2279 | sp = (Scsi_Cmnd *) sp->host_scribble; |
| 2280 | } |
| 2281 | ESPLOG(("]\n")); |
| 2282 | return do_reset_bus; |
| 2283 | } |
| 2284 | |
| 2285 | /* Do the needy when a target tries to reconnect to us. */ |
| 2286 | static int esp_do_reconnect(struct NCR_ESP *esp, |
| 2287 | struct ESP_regs *eregs) |
| 2288 | { |
| 2289 | int lun, target; |
| 2290 | Scsi_Cmnd *SCptr; |
| 2291 | |
| 2292 | /* Check for all bogus conditions first. */ |
| 2293 | target = reconnect_target(esp, eregs); |
| 2294 | if(target < 0) { |
| 2295 | ESPDISC(("bad bus bits\n")); |
| 2296 | return do_reset_bus; |
| 2297 | } |
| 2298 | lun = reconnect_lun(esp, eregs); |
| 2299 | if(lun < 0) { |
| 2300 | ESPDISC(("target=%2x, bad identify msg\n", target)); |
| 2301 | return do_reset_bus; |
| 2302 | } |
| 2303 | |
| 2304 | /* Things look ok... */ |
| 2305 | ESPDISC(("R<%02x,%02x>", target, lun)); |
| 2306 | |
| 2307 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 2308 | if(esp100_reconnect_hwbug(esp, eregs)) |
| 2309 | return do_reset_bus; |
| 2310 | esp_cmd(esp, eregs, ESP_CMD_NULL); |
| 2311 | |
| 2312 | SCptr = remove_SC(&esp->disconnected_SC, (unchar) target, (unchar) lun); |
| 2313 | if(!SCptr) |
| 2314 | return esp_bad_reconnect(esp); |
| 2315 | |
| 2316 | esp_connect(esp, eregs, SCptr); |
| 2317 | esp_cmd(esp, eregs, ESP_CMD_MOK); |
| 2318 | |
| 2319 | /* Reconnect implies a restore pointers operation. */ |
| 2320 | esp_restore_pointers(esp, SCptr); |
| 2321 | |
| 2322 | esp->snip = 0; |
| 2323 | esp_advance_phase(SCptr, in_the_dark); |
| 2324 | return do_intr_end; |
| 2325 | } |
| 2326 | |
| 2327 | /* End of NEXUS (hopefully), pick up status + message byte then leave if |
| 2328 | * all goes well. |
| 2329 | */ |
| 2330 | static int esp_do_status(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 2331 | { |
| 2332 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 2333 | int intr, rval; |
| 2334 | |
| 2335 | rval = skipahead1(esp, eregs, SCptr, in_the_dark, in_status); |
| 2336 | if(rval) |
| 2337 | return rval; |
| 2338 | |
| 2339 | intr = esp->ireg; |
| 2340 | ESPSTAT(("esp_do_status: ")); |
| 2341 | if(intr != ESP_INTR_DC) { |
| 2342 | int message_out = 0; /* for parity problems */ |
| 2343 | |
| 2344 | /* Ack the message. */ |
| 2345 | ESPSTAT(("ack msg, ")); |
| 2346 | esp_cmd(esp, eregs, ESP_CMD_MOK); |
| 2347 | |
| 2348 | if(esp->dma_poll) |
| 2349 | esp->dma_poll(esp, (unsigned char *) esp->esp_command); |
| 2350 | |
| 2351 | ESPSTAT(("got something, ")); |
| 2352 | /* ESP chimes in with one of |
| 2353 | * |
| 2354 | * 1) function done interrupt: |
| 2355 | * both status and message in bytes |
| 2356 | * are available |
| 2357 | * |
| 2358 | * 2) bus service interrupt: |
| 2359 | * only status byte was acquired |
| 2360 | * |
| 2361 | * 3) Anything else: |
| 2362 | * can't happen, but we test for it |
| 2363 | * anyways |
| 2364 | * |
| 2365 | * ALSO: If bad parity was detected on either |
| 2366 | * the status _or_ the message byte then |
| 2367 | * the ESP has asserted ATN on the bus |
| 2368 | * and we must therefore wait for the |
| 2369 | * next phase change. |
| 2370 | */ |
| 2371 | if(intr & ESP_INTR_FDONE) { |
| 2372 | /* We got it all, hallejulia. */ |
| 2373 | ESPSTAT(("got both, ")); |
| 2374 | SCptr->SCp.Status = esp->esp_command[0]; |
| 2375 | SCptr->SCp.Message = esp->esp_command[1]; |
| 2376 | esp->prevmsgin = SCptr->SCp.Message; |
| 2377 | esp->cur_msgin[0] = SCptr->SCp.Message; |
| 2378 | if(esp->sreg & ESP_STAT_PERR) { |
| 2379 | /* There was bad parity for the |
| 2380 | * message byte, the status byte |
| 2381 | * was ok. |
| 2382 | */ |
| 2383 | message_out = MSG_PARITY_ERROR; |
| 2384 | } |
| 2385 | } else if(intr == ESP_INTR_BSERV) { |
| 2386 | /* Only got status byte. */ |
| 2387 | ESPLOG(("esp%d: got status only, ", esp->esp_id)); |
| 2388 | if(!(esp->sreg & ESP_STAT_PERR)) { |
| 2389 | SCptr->SCp.Status = esp->esp_command[0]; |
| 2390 | SCptr->SCp.Message = 0xff; |
| 2391 | } else { |
| 2392 | /* The status byte had bad parity. |
| 2393 | * we leave the scsi_pointer Status |
| 2394 | * field alone as we set it to a default |
| 2395 | * of CHECK_CONDITION in esp_queue. |
| 2396 | */ |
| 2397 | message_out = INITIATOR_ERROR; |
| 2398 | } |
| 2399 | } else { |
| 2400 | /* This shouldn't happen ever. */ |
| 2401 | ESPSTAT(("got bolixed\n")); |
| 2402 | esp_advance_phase(SCptr, in_the_dark); |
| 2403 | return esp_do_phase_determine(esp, eregs); |
| 2404 | } |
| 2405 | |
| 2406 | if(!message_out) { |
| 2407 | ESPSTAT(("status=%2x msg=%2x, ", SCptr->SCp.Status, |
| 2408 | SCptr->SCp.Message)); |
| 2409 | if(SCptr->SCp.Message == COMMAND_COMPLETE) { |
| 2410 | ESPSTAT(("and was COMMAND_COMPLETE\n")); |
| 2411 | esp_advance_phase(SCptr, in_freeing); |
| 2412 | return esp_do_freebus(esp, eregs); |
| 2413 | } else { |
| 2414 | ESPLOG(("esp%d: and _not_ COMMAND_COMPLETE\n", |
| 2415 | esp->esp_id)); |
| 2416 | esp->msgin_len = esp->msgin_ctr = 1; |
| 2417 | esp_advance_phase(SCptr, in_msgindone); |
| 2418 | return esp_do_msgindone(esp, eregs); |
| 2419 | } |
| 2420 | } else { |
| 2421 | /* With luck we'll be able to let the target |
| 2422 | * know that bad parity happened, it will know |
| 2423 | * which byte caused the problems and send it |
| 2424 | * again. For the case where the status byte |
| 2425 | * receives bad parity, I do not believe most |
| 2426 | * targets recover very well. We'll see. |
| 2427 | */ |
| 2428 | ESPLOG(("esp%d: bad parity somewhere mout=%2x\n", |
| 2429 | esp->esp_id, message_out)); |
| 2430 | esp->cur_msgout[0] = message_out; |
| 2431 | esp->msgout_len = esp->msgout_ctr = 1; |
| 2432 | esp_advance_phase(SCptr, in_the_dark); |
| 2433 | return esp_do_phase_determine(esp, eregs); |
| 2434 | } |
| 2435 | } else { |
| 2436 | /* If we disconnect now, all hell breaks loose. */ |
| 2437 | ESPLOG(("esp%d: whoops, disconnect\n", esp->esp_id)); |
| 2438 | esp_advance_phase(SCptr, in_the_dark); |
| 2439 | return esp_do_phase_determine(esp, eregs); |
| 2440 | } |
| 2441 | } |
| 2442 | |
| 2443 | static int esp_enter_status(struct NCR_ESP *esp, |
| 2444 | struct ESP_regs *eregs) |
| 2445 | { |
| 2446 | unchar thecmd = ESP_CMD_ICCSEQ; |
| 2447 | |
| 2448 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 2449 | |
| 2450 | if(esp->do_pio_cmds) { |
| 2451 | esp_advance_phase(esp->current_SC, in_status); |
| 2452 | esp_cmd(esp, eregs, thecmd); |
| 2453 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); |
| 2454 | esp->esp_command[0] = esp_read(eregs->esp_fdata); |
| 2455 | while(!(esp_read(esp->eregs->esp_status) & ESP_STAT_INTR)); |
| 2456 | esp->esp_command[1] = esp_read(eregs->esp_fdata); |
| 2457 | } else { |
| 2458 | esp->esp_command[0] = esp->esp_command[1] = 0xff; |
| 2459 | esp_write(eregs->esp_tclow, 2); |
| 2460 | esp_write(eregs->esp_tcmed, 0); |
| 2461 | esp->dma_init_read(esp, esp->esp_command_dvma, 2); |
| 2462 | thecmd |= ESP_CMD_DMA; |
| 2463 | esp_cmd(esp, eregs, thecmd); |
| 2464 | esp_advance_phase(esp->current_SC, in_status); |
| 2465 | } |
| 2466 | |
| 2467 | return esp_do_status(esp, eregs); |
| 2468 | } |
| 2469 | |
| 2470 | static int esp_disconnect_amidst_phases(struct NCR_ESP *esp, |
| 2471 | struct ESP_regs *eregs) |
| 2472 | { |
| 2473 | Scsi_Cmnd *sp = esp->current_SC; |
| 2474 | struct esp_device *esp_dev = sp->device->hostdata; |
| 2475 | |
| 2476 | /* This means real problems if we see this |
| 2477 | * here. Unless we were actually trying |
| 2478 | * to force the device to abort/reset. |
| 2479 | */ |
| 2480 | ESPLOG(("esp%d: Disconnect amidst phases, ", esp->esp_id)); |
| 2481 | ESPLOG(("pphase<%s> cphase<%s>, ", |
| 2482 | phase_string(sp->SCp.phase), |
| 2483 | phase_string(sp->SCp.sent_command))); |
| 2484 | |
| 2485 | if(esp->disconnected_SC) |
| 2486 | esp_cmd(esp, eregs, ESP_CMD_ESEL); |
| 2487 | |
| 2488 | switch(esp->cur_msgout[0]) { |
| 2489 | default: |
| 2490 | /* We didn't expect this to happen at all. */ |
| 2491 | ESPLOG(("device is bolixed\n")); |
| 2492 | esp_advance_phase(sp, in_tgterror); |
| 2493 | esp_done(esp, (DID_ERROR << 16)); |
| 2494 | break; |
| 2495 | |
| 2496 | case BUS_DEVICE_RESET: |
| 2497 | ESPLOG(("device reset successful\n")); |
| 2498 | esp_dev->sync_max_offset = 0; |
| 2499 | esp_dev->sync_min_period = 0; |
| 2500 | esp_dev->sync = 0; |
| 2501 | esp_advance_phase(sp, in_resetdev); |
| 2502 | esp_done(esp, (DID_RESET << 16)); |
| 2503 | break; |
| 2504 | |
| 2505 | case ABORT: |
| 2506 | ESPLOG(("device abort successful\n")); |
| 2507 | esp_advance_phase(sp, in_abortone); |
| 2508 | esp_done(esp, (DID_ABORT << 16)); |
| 2509 | break; |
| 2510 | |
| 2511 | }; |
| 2512 | return do_intr_end; |
| 2513 | } |
| 2514 | |
| 2515 | static int esp_enter_msgout(struct NCR_ESP *esp, |
| 2516 | struct ESP_regs *eregs) |
| 2517 | { |
| 2518 | esp_advance_phase(esp->current_SC, in_msgout); |
| 2519 | return esp_do_msgout(esp, eregs); |
| 2520 | } |
| 2521 | |
| 2522 | static int esp_enter_msgin(struct NCR_ESP *esp, |
| 2523 | struct ESP_regs *eregs) |
| 2524 | { |
| 2525 | esp_advance_phase(esp->current_SC, in_msgin); |
| 2526 | return esp_do_msgin(esp, eregs); |
| 2527 | } |
| 2528 | |
| 2529 | static int esp_enter_cmd(struct NCR_ESP *esp, |
| 2530 | struct ESP_regs *eregs) |
| 2531 | { |
| 2532 | esp_advance_phase(esp->current_SC, in_cmdbegin); |
| 2533 | return esp_do_cmdbegin(esp, eregs); |
| 2534 | } |
| 2535 | |
| 2536 | static int esp_enter_badphase(struct NCR_ESP *esp, |
| 2537 | struct ESP_regs *eregs) |
| 2538 | { |
| 2539 | ESPLOG(("esp%d: Bizarre bus phase %2x.\n", esp->esp_id, |
| 2540 | esp->sreg & ESP_STAT_PMASK)); |
| 2541 | return do_reset_bus; |
| 2542 | } |
| 2543 | |
| 2544 | typedef int (*espfunc_t)(struct NCR_ESP *, |
| 2545 | struct ESP_regs *); |
| 2546 | |
| 2547 | static espfunc_t phase_vector[] = { |
| 2548 | esp_do_data, /* ESP_DOP */ |
| 2549 | esp_do_data, /* ESP_DIP */ |
| 2550 | esp_enter_cmd, /* ESP_CMDP */ |
| 2551 | esp_enter_status, /* ESP_STATP */ |
| 2552 | esp_enter_badphase, /* ESP_STAT_PMSG */ |
| 2553 | esp_enter_badphase, /* ESP_STAT_PMSG | ESP_STAT_PIO */ |
| 2554 | esp_enter_msgout, /* ESP_MOP */ |
| 2555 | esp_enter_msgin, /* ESP_MIP */ |
| 2556 | }; |
| 2557 | |
| 2558 | /* The target has control of the bus and we have to see where it has |
| 2559 | * taken us. |
| 2560 | */ |
| 2561 | static int esp_do_phase_determine(struct NCR_ESP *esp, |
| 2562 | struct ESP_regs *eregs) |
| 2563 | { |
| 2564 | if ((esp->ireg & ESP_INTR_DC) != 0) |
| 2565 | return esp_disconnect_amidst_phases(esp, eregs); |
| 2566 | return phase_vector[esp->sreg & ESP_STAT_PMASK](esp, eregs); |
| 2567 | } |
| 2568 | |
| 2569 | /* First interrupt after exec'ing a cmd comes here. */ |
| 2570 | static int esp_select_complete(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 2571 | { |
| 2572 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 2573 | struct esp_device *esp_dev = SCptr->device->hostdata; |
| 2574 | int cmd_bytes_sent, fcnt; |
| 2575 | |
| 2576 | fcnt = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES); |
| 2577 | cmd_bytes_sent = esp->dma_bytes_sent(esp, fcnt); |
| 2578 | if(esp->dma_invalidate) |
| 2579 | esp->dma_invalidate(esp); |
| 2580 | |
| 2581 | /* Let's check to see if a reselect happened |
| 2582 | * while we we're trying to select. This must |
| 2583 | * be checked first. |
| 2584 | */ |
| 2585 | if(esp->ireg == (ESP_INTR_RSEL | ESP_INTR_FDONE)) { |
| 2586 | esp_reconnect(esp, SCptr); |
| 2587 | return esp_do_reconnect(esp, eregs); |
| 2588 | } |
| 2589 | |
| 2590 | /* Looks like things worked, we should see a bus service & |
| 2591 | * a function complete interrupt at this point. Note we |
| 2592 | * are doing a direct comparison because we don't want to |
| 2593 | * be fooled into thinking selection was successful if |
| 2594 | * ESP_INTR_DC is set, see below. |
| 2595 | */ |
| 2596 | if(esp->ireg == (ESP_INTR_FDONE | ESP_INTR_BSERV)) { |
| 2597 | /* target speaks... */ |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 2598 | esp->targets_present |= (1<<scmd_id(SCptr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2599 | |
| 2600 | /* What if the target ignores the sdtr? */ |
| 2601 | if(esp->snip) |
| 2602 | esp_dev->sync = 1; |
| 2603 | |
| 2604 | /* See how far, if at all, we got in getting |
| 2605 | * the information out to the target. |
| 2606 | */ |
| 2607 | switch(esp->seqreg) { |
| 2608 | default: |
| 2609 | |
| 2610 | case ESP_STEP_ASEL: |
| 2611 | /* Arbitration won, target selected, but |
| 2612 | * we are in some phase which is not command |
| 2613 | * phase nor is it message out phase. |
| 2614 | * |
| 2615 | * XXX We've confused the target, obviously. |
| 2616 | * XXX So clear it's state, but we also end |
| 2617 | * XXX up clearing everyone elses. That isn't |
| 2618 | * XXX so nice. I'd like to just reset this |
| 2619 | * XXX target, but if I cannot even get it's |
| 2620 | * XXX attention and finish selection to talk |
| 2621 | * XXX to it, there is not much more I can do. |
| 2622 | * XXX If we have a loaded bus we're going to |
| 2623 | * XXX spend the next second or so renegotiating |
| 2624 | * XXX for synchronous transfers. |
| 2625 | */ |
| 2626 | ESPLOG(("esp%d: STEP_ASEL for tgt %d\n", |
| 2627 | esp->esp_id, SCptr->device->id)); |
| 2628 | |
| 2629 | case ESP_STEP_SID: |
| 2630 | /* Arbitration won, target selected, went |
| 2631 | * to message out phase, sent one message |
| 2632 | * byte, then we stopped. ATN is asserted |
| 2633 | * on the SCSI bus and the target is still |
| 2634 | * there hanging on. This is a legal |
| 2635 | * sequence step if we gave the ESP a select |
| 2636 | * and stop command. |
| 2637 | * |
| 2638 | * XXX See above, I could set the borken flag |
| 2639 | * XXX in the device struct and retry the |
| 2640 | * XXX command. But would that help for |
| 2641 | * XXX tagged capable targets? |
| 2642 | */ |
| 2643 | |
| 2644 | case ESP_STEP_NCMD: |
| 2645 | /* Arbitration won, target selected, maybe |
| 2646 | * sent the one message byte in message out |
| 2647 | * phase, but we did not go to command phase |
| 2648 | * in the end. Actually, we could have sent |
| 2649 | * only some of the message bytes if we tried |
| 2650 | * to send out the entire identify and tag |
| 2651 | * message using ESP_CMD_SA3. |
| 2652 | */ |
| 2653 | cmd_bytes_sent = 0; |
| 2654 | break; |
| 2655 | |
| 2656 | case ESP_STEP_PPC: |
| 2657 | /* No, not the powerPC pinhead. Arbitration |
| 2658 | * won, all message bytes sent if we went to |
| 2659 | * message out phase, went to command phase |
| 2660 | * but only part of the command was sent. |
| 2661 | * |
| 2662 | * XXX I've seen this, but usually in conjunction |
| 2663 | * XXX with a gross error which appears to have |
| 2664 | * XXX occurred between the time I told the |
| 2665 | * XXX ESP to arbitrate and when I got the |
| 2666 | * XXX interrupt. Could I have misloaded the |
| 2667 | * XXX command bytes into the fifo? Actually, |
| 2668 | * XXX I most likely missed a phase, and therefore |
| 2669 | * XXX went into never never land and didn't even |
| 2670 | * XXX know it. That was the old driver though. |
| 2671 | * XXX What is even more peculiar is that the ESP |
| 2672 | * XXX showed the proper function complete and |
| 2673 | * XXX bus service bits in the interrupt register. |
| 2674 | */ |
| 2675 | |
| 2676 | case ESP_STEP_FINI4: |
| 2677 | case ESP_STEP_FINI5: |
| 2678 | case ESP_STEP_FINI6: |
| 2679 | case ESP_STEP_FINI7: |
| 2680 | /* Account for the identify message */ |
| 2681 | if(SCptr->SCp.phase == in_slct_norm) |
| 2682 | cmd_bytes_sent -= 1; |
| 2683 | }; |
| 2684 | esp_cmd(esp, eregs, ESP_CMD_NULL); |
| 2685 | |
| 2686 | /* Be careful, we could really get fucked during synchronous |
| 2687 | * data transfers if we try to flush the fifo now. |
| 2688 | */ |
| 2689 | if(!fcnt && /* Fifo is empty and... */ |
| 2690 | /* either we are not doing synchronous transfers or... */ |
| 2691 | (!esp_dev->sync_max_offset || |
| 2692 | /* We are not going into data in phase. */ |
| 2693 | ((esp->sreg & ESP_STAT_PMASK) != ESP_DIP))) |
| 2694 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); /* flush is safe */ |
| 2695 | |
| 2696 | /* See how far we got if this is not a slow command. */ |
| 2697 | if(!esp->esp_slowcmd) { |
| 2698 | if(cmd_bytes_sent < 0) |
| 2699 | cmd_bytes_sent = 0; |
| 2700 | if(cmd_bytes_sent != SCptr->cmd_len) { |
| 2701 | /* Crapola, mark it as a slowcmd |
| 2702 | * so that we have some chance of |
| 2703 | * keeping the command alive with |
| 2704 | * good luck. |
| 2705 | * |
| 2706 | * XXX Actually, if we didn't send it all |
| 2707 | * XXX this means either we didn't set things |
| 2708 | * XXX up properly (driver bug) or the target |
| 2709 | * XXX or the ESP detected parity on one of |
| 2710 | * XXX the command bytes. This makes much |
| 2711 | * XXX more sense, and therefore this code |
| 2712 | * XXX should be changed to send out a |
| 2713 | * XXX parity error message or if the status |
| 2714 | * XXX register shows no parity error then |
| 2715 | * XXX just expect the target to bring the |
| 2716 | * XXX bus into message in phase so that it |
| 2717 | * XXX can send us the parity error message. |
| 2718 | * XXX SCSI sucks... |
| 2719 | */ |
| 2720 | esp->esp_slowcmd = 1; |
| 2721 | esp->esp_scmdp = &(SCptr->cmnd[cmd_bytes_sent]); |
| 2722 | esp->esp_scmdleft = (SCptr->cmd_len - cmd_bytes_sent); |
| 2723 | } |
| 2724 | } |
| 2725 | |
| 2726 | /* Now figure out where we went. */ |
| 2727 | esp_advance_phase(SCptr, in_the_dark); |
| 2728 | return esp_do_phase_determine(esp, eregs); |
| 2729 | } |
| 2730 | |
| 2731 | /* Did the target even make it? */ |
| 2732 | if(esp->ireg == ESP_INTR_DC) { |
| 2733 | /* wheee... nobody there or they didn't like |
| 2734 | * what we told it to do, clean up. |
| 2735 | */ |
| 2736 | |
| 2737 | /* If anyone is off the bus, but working on |
| 2738 | * a command in the background for us, tell |
| 2739 | * the ESP to listen for them. |
| 2740 | */ |
| 2741 | if(esp->disconnected_SC) |
| 2742 | esp_cmd(esp, eregs, ESP_CMD_ESEL); |
| 2743 | |
| 2744 | if(((1<<SCptr->device->id) & esp->targets_present) && |
| 2745 | esp->seqreg && esp->cur_msgout[0] == EXTENDED_MESSAGE && |
| 2746 | (SCptr->SCp.phase == in_slct_msg || |
| 2747 | SCptr->SCp.phase == in_slct_stop)) { |
| 2748 | /* shit */ |
| 2749 | esp->snip = 0; |
| 2750 | ESPLOG(("esp%d: Failed synchronous negotiation for target %d " |
| 2751 | "lun %d\n", esp->esp_id, SCptr->device->id, SCptr->device->lun)); |
| 2752 | esp_dev->sync_max_offset = 0; |
| 2753 | esp_dev->sync_min_period = 0; |
| 2754 | esp_dev->sync = 1; /* so we don't negotiate again */ |
| 2755 | |
| 2756 | /* Run the command again, this time though we |
| 2757 | * won't try to negotiate for synchronous transfers. |
| 2758 | * |
| 2759 | * XXX I'd like to do something like send an |
| 2760 | * XXX INITIATOR_ERROR or ABORT message to the |
| 2761 | * XXX target to tell it, "Sorry I confused you, |
| 2762 | * XXX please come back and I will be nicer next |
| 2763 | * XXX time". But that requires having the target |
| 2764 | * XXX on the bus, and it has dropped BSY on us. |
| 2765 | */ |
| 2766 | esp->current_SC = NULL; |
| 2767 | esp_advance_phase(SCptr, not_issued); |
| 2768 | prepend_SC(&esp->issue_SC, SCptr); |
| 2769 | esp_exec_cmd(esp); |
| 2770 | return do_intr_end; |
| 2771 | } |
| 2772 | |
| 2773 | /* Ok, this is normal, this is what we see during boot |
| 2774 | * or whenever when we are scanning the bus for targets. |
| 2775 | * But first make sure that is really what is happening. |
| 2776 | */ |
| 2777 | if(((1<<SCptr->device->id) & esp->targets_present)) { |
| 2778 | ESPLOG(("esp%d: Warning, live target %d not responding to " |
| 2779 | "selection.\n", esp->esp_id, SCptr->device->id)); |
| 2780 | |
| 2781 | /* This _CAN_ happen. The SCSI standard states that |
| 2782 | * the target is to _not_ respond to selection if |
| 2783 | * _it_ detects bad parity on the bus for any reason. |
| 2784 | * Therefore, we assume that if we've talked successfully |
| 2785 | * to this target before, bad parity is the problem. |
| 2786 | */ |
| 2787 | esp_done(esp, (DID_PARITY << 16)); |
| 2788 | } else { |
| 2789 | /* Else, there really isn't anyone there. */ |
| 2790 | ESPMISC(("esp: selection failure, maybe nobody there?\n")); |
| 2791 | ESPMISC(("esp: target %d lun %d\n", |
| 2792 | SCptr->device->id, SCptr->device->lun)); |
| 2793 | esp_done(esp, (DID_BAD_TARGET << 16)); |
| 2794 | } |
| 2795 | return do_intr_end; |
| 2796 | } |
| 2797 | |
| 2798 | |
| 2799 | ESPLOG(("esp%d: Selection failure.\n", esp->esp_id)); |
| 2800 | printk("esp%d: Currently -- ", esp->esp_id); |
| 2801 | esp_print_ireg(esp->ireg); |
| 2802 | printk(" "); |
| 2803 | esp_print_statreg(esp->sreg); |
| 2804 | printk(" "); |
| 2805 | esp_print_seqreg(esp->seqreg); |
| 2806 | printk("\n"); |
| 2807 | printk("esp%d: New -- ", esp->esp_id); |
| 2808 | esp->sreg = esp_read(eregs->esp_status); |
| 2809 | esp->seqreg = esp_read(eregs->esp_sstep); |
| 2810 | esp->ireg = esp_read(eregs->esp_intrpt); |
| 2811 | esp_print_ireg(esp->ireg); |
| 2812 | printk(" "); |
| 2813 | esp_print_statreg(esp->sreg); |
| 2814 | printk(" "); |
| 2815 | esp_print_seqreg(esp->seqreg); |
| 2816 | printk("\n"); |
| 2817 | ESPLOG(("esp%d: resetting bus\n", esp->esp_id)); |
| 2818 | return do_reset_bus; /* ugh... */ |
| 2819 | } |
| 2820 | |
| 2821 | /* Continue reading bytes for msgin phase. */ |
| 2822 | static int esp_do_msgincont(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 2823 | { |
| 2824 | if(esp->ireg & ESP_INTR_BSERV) { |
| 2825 | /* in the right phase too? */ |
| 2826 | if((esp->sreg & ESP_STAT_PMASK) == ESP_MIP) { |
| 2827 | /* phew... */ |
| 2828 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 2829 | esp_advance_phase(esp->current_SC, in_msgindone); |
| 2830 | return do_intr_end; |
| 2831 | } |
| 2832 | |
| 2833 | /* We changed phase but ESP shows bus service, |
| 2834 | * in this case it is most likely that we, the |
| 2835 | * hacker who has been up for 20hrs straight |
| 2836 | * staring at the screen, drowned in coffee |
| 2837 | * smelling like retched cigarette ashes |
| 2838 | * have miscoded something..... so, try to |
| 2839 | * recover as best we can. |
| 2840 | */ |
| 2841 | ESPLOG(("esp%d: message in mis-carriage.\n", esp->esp_id)); |
| 2842 | } |
| 2843 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 2844 | return do_phase_determine; |
| 2845 | } |
| 2846 | |
| 2847 | static int check_singlebyte_msg(struct NCR_ESP *esp, |
| 2848 | struct ESP_regs *eregs) |
| 2849 | { |
| 2850 | esp->prevmsgin = esp->cur_msgin[0]; |
| 2851 | if(esp->cur_msgin[0] & 0x80) { |
| 2852 | /* wheee... */ |
| 2853 | ESPLOG(("esp%d: target sends identify amidst phases\n", |
| 2854 | esp->esp_id)); |
| 2855 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 2856 | return 0; |
| 2857 | } else if(((esp->cur_msgin[0] & 0xf0) == 0x20) || |
| 2858 | (esp->cur_msgin[0] == EXTENDED_MESSAGE)) { |
| 2859 | esp->msgin_len = 2; |
| 2860 | esp_advance_phase(esp->current_SC, in_msgincont); |
| 2861 | return 0; |
| 2862 | } |
| 2863 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 2864 | switch(esp->cur_msgin[0]) { |
| 2865 | default: |
| 2866 | /* We don't want to hear about it. */ |
| 2867 | ESPLOG(("esp%d: msg %02x which we don't know about\n", esp->esp_id, |
| 2868 | esp->cur_msgin[0])); |
| 2869 | return MESSAGE_REJECT; |
| 2870 | |
| 2871 | case NOP: |
| 2872 | ESPLOG(("esp%d: target %d sends a nop\n", esp->esp_id, |
| 2873 | esp->current_SC->device->id)); |
| 2874 | return 0; |
| 2875 | |
| 2876 | case RESTORE_POINTERS: |
| 2877 | /* In this case we might also have to backup the |
| 2878 | * "slow command" pointer. It is rare to get such |
| 2879 | * a save/restore pointer sequence so early in the |
| 2880 | * bus transition sequences, but cover it. |
| 2881 | */ |
| 2882 | if(esp->esp_slowcmd) { |
| 2883 | esp->esp_scmdleft = esp->current_SC->cmd_len; |
| 2884 | esp->esp_scmdp = &esp->current_SC->cmnd[0]; |
| 2885 | } |
| 2886 | esp_restore_pointers(esp, esp->current_SC); |
| 2887 | return 0; |
| 2888 | |
| 2889 | case SAVE_POINTERS: |
| 2890 | esp_save_pointers(esp, esp->current_SC); |
| 2891 | return 0; |
| 2892 | |
| 2893 | case COMMAND_COMPLETE: |
| 2894 | case DISCONNECT: |
| 2895 | /* Freeing the bus, let it go. */ |
| 2896 | esp->current_SC->SCp.phase = in_freeing; |
| 2897 | return 0; |
| 2898 | |
| 2899 | case MESSAGE_REJECT: |
| 2900 | ESPMISC(("msg reject, ")); |
| 2901 | if(esp->prevmsgout == EXTENDED_MESSAGE) { |
| 2902 | struct esp_device *esp_dev = esp->current_SC->device->hostdata; |
| 2903 | |
| 2904 | /* Doesn't look like this target can |
| 2905 | * do synchronous or WIDE transfers. |
| 2906 | */ |
| 2907 | ESPSDTR(("got reject, was trying nego, clearing sync/WIDE\n")); |
| 2908 | esp_dev->sync = 1; |
| 2909 | esp_dev->wide = 1; |
| 2910 | esp_dev->sync_min_period = 0; |
| 2911 | esp_dev->sync_max_offset = 0; |
| 2912 | return 0; |
| 2913 | } else { |
| 2914 | ESPMISC(("not sync nego, sending ABORT\n")); |
| 2915 | return ABORT; |
| 2916 | } |
| 2917 | }; |
| 2918 | } |
| 2919 | |
| 2920 | /* Target negotiates for synchronous transfers before we do, this |
| 2921 | * is legal although very strange. What is even funnier is that |
| 2922 | * the SCSI2 standard specifically recommends against targets doing |
| 2923 | * this because so many initiators cannot cope with this occurring. |
| 2924 | */ |
| 2925 | static int target_with_ants_in_pants(struct NCR_ESP *esp, |
| 2926 | Scsi_Cmnd *SCptr, |
| 2927 | struct esp_device *esp_dev) |
| 2928 | { |
| 2929 | if(esp_dev->sync || SCptr->device->borken) { |
| 2930 | /* sorry, no can do */ |
| 2931 | ESPSDTR(("forcing to async, ")); |
| 2932 | build_sync_nego_msg(esp, 0, 0); |
| 2933 | esp_dev->sync = 1; |
| 2934 | esp->snip = 1; |
| 2935 | ESPLOG(("esp%d: hoping for msgout\n", esp->esp_id)); |
| 2936 | esp_advance_phase(SCptr, in_the_dark); |
| 2937 | return EXTENDED_MESSAGE; |
| 2938 | } |
| 2939 | |
| 2940 | /* Ok, we'll check them out... */ |
| 2941 | return 0; |
| 2942 | } |
| 2943 | |
| 2944 | static void sync_report(struct NCR_ESP *esp) |
| 2945 | { |
| 2946 | int msg3, msg4; |
| 2947 | char *type; |
| 2948 | |
| 2949 | msg3 = esp->cur_msgin[3]; |
| 2950 | msg4 = esp->cur_msgin[4]; |
| 2951 | if(msg4) { |
| 2952 | int hz = 1000000000 / (msg3 * 4); |
| 2953 | int integer = hz / 1000000; |
| 2954 | int fraction = (hz - (integer * 1000000)) / 10000; |
| 2955 | if((msg3 * 4) < 200) { |
| 2956 | type = "FAST"; |
| 2957 | } else { |
| 2958 | type = "synchronous"; |
| 2959 | } |
| 2960 | |
| 2961 | /* Do not transform this back into one big printk |
| 2962 | * again, it triggers a bug in our sparc64-gcc272 |
| 2963 | * sibling call optimization. -DaveM |
| 2964 | */ |
| 2965 | ESPLOG((KERN_INFO "esp%d: target %d ", |
| 2966 | esp->esp_id, esp->current_SC->device->id)); |
| 2967 | ESPLOG(("[period %dns offset %d %d.%02dMHz ", |
| 2968 | (int) msg3 * 4, (int) msg4, |
| 2969 | integer, fraction)); |
| 2970 | ESPLOG(("%s SCSI%s]\n", type, |
| 2971 | (((msg3 * 4) < 200) ? "-II" : ""))); |
| 2972 | } else { |
| 2973 | ESPLOG((KERN_INFO "esp%d: target %d asynchronous\n", |
| 2974 | esp->esp_id, esp->current_SC->device->id)); |
| 2975 | } |
| 2976 | } |
| 2977 | |
| 2978 | static int check_multibyte_msg(struct NCR_ESP *esp, |
| 2979 | struct ESP_regs *eregs) |
| 2980 | { |
| 2981 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 2982 | struct esp_device *esp_dev = SCptr->device->hostdata; |
| 2983 | unchar regval = 0; |
| 2984 | int message_out = 0; |
| 2985 | |
| 2986 | ESPSDTR(("chk multibyte msg: ")); |
| 2987 | if(esp->cur_msgin[2] == EXTENDED_SDTR) { |
| 2988 | int period = esp->cur_msgin[3]; |
| 2989 | int offset = esp->cur_msgin[4]; |
| 2990 | |
| 2991 | ESPSDTR(("is sync nego response, ")); |
| 2992 | if(!esp->snip) { |
| 2993 | int rval; |
| 2994 | |
| 2995 | /* Target negotiates first! */ |
| 2996 | ESPSDTR(("target jumps the gun, ")); |
| 2997 | message_out = EXTENDED_MESSAGE; /* we must respond */ |
| 2998 | rval = target_with_ants_in_pants(esp, SCptr, esp_dev); |
| 2999 | if(rval) |
| 3000 | return rval; |
| 3001 | } |
| 3002 | |
| 3003 | ESPSDTR(("examining sdtr, ")); |
| 3004 | |
| 3005 | /* Offset cannot be larger than ESP fifo size. */ |
| 3006 | if(offset > 15) { |
| 3007 | ESPSDTR(("offset too big %2x, ", offset)); |
| 3008 | offset = 15; |
| 3009 | ESPSDTR(("sending back new offset\n")); |
| 3010 | build_sync_nego_msg(esp, period, offset); |
| 3011 | return EXTENDED_MESSAGE; |
| 3012 | } |
| 3013 | |
| 3014 | if(offset && period > esp->max_period) { |
| 3015 | /* Yeee, async for this slow device. */ |
| 3016 | ESPSDTR(("period too long %2x, ", period)); |
| 3017 | build_sync_nego_msg(esp, 0, 0); |
| 3018 | ESPSDTR(("hoping for msgout\n")); |
| 3019 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 3020 | return EXTENDED_MESSAGE; |
| 3021 | } else if (offset && period < esp->min_period) { |
| 3022 | ESPSDTR(("period too short %2x, ", period)); |
| 3023 | period = esp->min_period; |
| 3024 | if(esp->erev > esp236) |
| 3025 | regval = 4; |
| 3026 | else |
| 3027 | regval = 5; |
| 3028 | } else if(offset) { |
| 3029 | int tmp; |
| 3030 | |
| 3031 | ESPSDTR(("period is ok, ")); |
| 3032 | tmp = esp->ccycle / 1000; |
| 3033 | regval = (((period << 2) + tmp - 1) / tmp); |
| 3034 | if(regval && (esp->erev > esp236)) { |
| 3035 | if(period >= 50) |
| 3036 | regval--; |
| 3037 | } |
| 3038 | } |
| 3039 | |
| 3040 | if(offset) { |
| 3041 | unchar bit; |
| 3042 | |
| 3043 | esp_dev->sync_min_period = (regval & 0x1f); |
| 3044 | esp_dev->sync_max_offset = (offset | esp->radelay); |
| 3045 | if(esp->erev > esp236) { |
| 3046 | if(esp->erev == fas100a) |
| 3047 | bit = ESP_CONFIG3_FAST; |
| 3048 | else |
| 3049 | bit = ESP_CONFIG3_FSCSI; |
| 3050 | if(period < 50) |
| 3051 | esp->config3[SCptr->device->id] |= bit; |
| 3052 | else |
| 3053 | esp->config3[SCptr->device->id] &= ~bit; |
| 3054 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; |
| 3055 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 3056 | } |
| 3057 | esp->prev_soff = esp_dev->sync_min_period; |
| 3058 | esp_write(eregs->esp_soff, esp->prev_soff); |
| 3059 | esp->prev_stp = esp_dev->sync_max_offset; |
| 3060 | esp_write(eregs->esp_stp, esp->prev_stp); |
| 3061 | |
| 3062 | ESPSDTR(("soff=%2x stp=%2x cfg3=%2x\n", |
| 3063 | esp_dev->sync_max_offset, |
| 3064 | esp_dev->sync_min_period, |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 3065 | esp->config3[scmd_id(SCptr)])); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3066 | |
| 3067 | esp->snip = 0; |
| 3068 | } else if(esp_dev->sync_max_offset) { |
| 3069 | unchar bit; |
| 3070 | |
| 3071 | /* back to async mode */ |
| 3072 | ESPSDTR(("unaccaptable sync nego, forcing async\n")); |
| 3073 | esp_dev->sync_max_offset = 0; |
| 3074 | esp_dev->sync_min_period = 0; |
| 3075 | esp->prev_soff = 0; |
| 3076 | esp_write(eregs->esp_soff, 0); |
| 3077 | esp->prev_stp = 0; |
| 3078 | esp_write(eregs->esp_stp, 0); |
| 3079 | if(esp->erev > esp236) { |
| 3080 | if(esp->erev == fas100a) |
| 3081 | bit = ESP_CONFIG3_FAST; |
| 3082 | else |
| 3083 | bit = ESP_CONFIG3_FSCSI; |
| 3084 | esp->config3[SCptr->device->id] &= ~bit; |
| 3085 | esp->prev_cfg3 = esp->config3[SCptr->device->id]; |
| 3086 | esp_write(eregs->esp_cfg3, esp->prev_cfg3); |
| 3087 | } |
| 3088 | } |
| 3089 | |
| 3090 | sync_report(esp); |
| 3091 | |
| 3092 | ESPSDTR(("chk multibyte msg: sync is known, ")); |
| 3093 | esp_dev->sync = 1; |
| 3094 | |
| 3095 | if(message_out) { |
| 3096 | ESPLOG(("esp%d: sending sdtr back, hoping for msgout\n", |
| 3097 | esp->esp_id)); |
| 3098 | build_sync_nego_msg(esp, period, offset); |
| 3099 | esp_advance_phase(SCptr, in_the_dark); |
| 3100 | return EXTENDED_MESSAGE; |
| 3101 | } |
| 3102 | |
| 3103 | ESPSDTR(("returning zero\n")); |
| 3104 | esp_advance_phase(SCptr, in_the_dark); /* ...or else! */ |
| 3105 | return 0; |
| 3106 | } else if(esp->cur_msgin[2] == EXTENDED_WDTR) { |
| 3107 | ESPLOG(("esp%d: AIEEE wide msg received\n", esp->esp_id)); |
| 3108 | message_out = MESSAGE_REJECT; |
| 3109 | } else if(esp->cur_msgin[2] == EXTENDED_MODIFY_DATA_POINTER) { |
| 3110 | ESPLOG(("esp%d: rejecting modify data ptr msg\n", esp->esp_id)); |
| 3111 | message_out = MESSAGE_REJECT; |
| 3112 | } |
| 3113 | esp_advance_phase(SCptr, in_the_dark); |
| 3114 | return message_out; |
| 3115 | } |
| 3116 | |
| 3117 | static int esp_do_msgindone(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3118 | { |
| 3119 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 3120 | int message_out = 0, it = 0, rval; |
| 3121 | |
| 3122 | rval = skipahead1(esp, eregs, SCptr, in_msgin, in_msgindone); |
| 3123 | if(rval) |
| 3124 | return rval; |
| 3125 | if(SCptr->SCp.sent_command != in_status) { |
| 3126 | if(!(esp->ireg & ESP_INTR_DC)) { |
| 3127 | if(esp->msgin_len && (esp->sreg & ESP_STAT_PERR)) { |
| 3128 | message_out = MSG_PARITY_ERROR; |
| 3129 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 3130 | } else if((it = (esp_read(eregs->esp_fflags) & ESP_FF_FBYTES))!=1) { |
| 3131 | /* We certainly dropped the ball somewhere. */ |
| 3132 | message_out = INITIATOR_ERROR; |
| 3133 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 3134 | } else if(!esp->msgin_len) { |
| 3135 | it = esp_read(eregs->esp_fdata); |
| 3136 | esp_advance_phase(SCptr, in_msgincont); |
| 3137 | } else { |
| 3138 | /* it is ok and we want it */ |
| 3139 | it = esp->cur_msgin[esp->msgin_ctr] = |
| 3140 | esp_read(eregs->esp_fdata); |
| 3141 | esp->msgin_ctr++; |
| 3142 | } |
| 3143 | } else { |
| 3144 | esp_advance_phase(SCptr, in_the_dark); |
| 3145 | return do_work_bus; |
| 3146 | } |
| 3147 | } else { |
| 3148 | it = esp->cur_msgin[0]; |
| 3149 | } |
| 3150 | if(!message_out && esp->msgin_len) { |
| 3151 | if(esp->msgin_ctr < esp->msgin_len) { |
| 3152 | esp_advance_phase(SCptr, in_msgincont); |
| 3153 | } else if(esp->msgin_len == 1) { |
| 3154 | message_out = check_singlebyte_msg(esp, eregs); |
| 3155 | } else if(esp->msgin_len == 2) { |
| 3156 | if(esp->cur_msgin[0] == EXTENDED_MESSAGE) { |
| 3157 | if((it+2) >= 15) { |
| 3158 | message_out = MESSAGE_REJECT; |
| 3159 | } else { |
| 3160 | esp->msgin_len = (it + 2); |
| 3161 | esp_advance_phase(SCptr, in_msgincont); |
| 3162 | } |
| 3163 | } else { |
| 3164 | message_out = MESSAGE_REJECT; /* foo on you */ |
| 3165 | } |
| 3166 | } else { |
| 3167 | message_out = check_multibyte_msg(esp, eregs); |
| 3168 | } |
| 3169 | } |
| 3170 | if(message_out < 0) { |
| 3171 | return -message_out; |
| 3172 | } else if(message_out) { |
| 3173 | if(((message_out != 1) && |
| 3174 | ((message_out < 0x20) || (message_out & 0x80)))) |
| 3175 | esp->msgout_len = 1; |
| 3176 | esp->cur_msgout[0] = message_out; |
| 3177 | esp_cmd(esp, eregs, ESP_CMD_SATN); |
| 3178 | esp_advance_phase(SCptr, in_the_dark); |
| 3179 | esp->msgin_len = 0; |
| 3180 | } |
| 3181 | esp->sreg = esp_read(eregs->esp_status); |
| 3182 | esp->sreg &= ~(ESP_STAT_INTR); |
| 3183 | if((esp->sreg & (ESP_STAT_PMSG|ESP_STAT_PCD)) == (ESP_STAT_PMSG|ESP_STAT_PCD)) |
| 3184 | esp_cmd(esp, eregs, ESP_CMD_MOK); |
| 3185 | if((SCptr->SCp.sent_command == in_msgindone) && |
| 3186 | (SCptr->SCp.phase == in_freeing)) |
| 3187 | return esp_do_freebus(esp, eregs); |
| 3188 | return do_intr_end; |
| 3189 | } |
| 3190 | |
| 3191 | static int esp_do_cmdbegin(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3192 | { |
| 3193 | unsigned char tmp; |
| 3194 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 3195 | |
| 3196 | esp_advance_phase(SCptr, in_cmdend); |
| 3197 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 3198 | tmp = *esp->esp_scmdp++; |
| 3199 | esp->esp_scmdleft--; |
| 3200 | esp_write(eregs->esp_fdata, tmp); |
| 3201 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3202 | return do_intr_end; |
| 3203 | } |
| 3204 | |
| 3205 | static int esp_do_cmddone(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3206 | { |
| 3207 | esp_cmd(esp, eregs, ESP_CMD_NULL); |
| 3208 | if(esp->ireg & ESP_INTR_BSERV) { |
| 3209 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 3210 | return esp_do_phase_determine(esp, eregs); |
| 3211 | } |
| 3212 | ESPLOG(("esp%d: in do_cmddone() but didn't get BSERV interrupt.\n", |
| 3213 | esp->esp_id)); |
| 3214 | return do_reset_bus; |
| 3215 | } |
| 3216 | |
| 3217 | static int esp_do_msgout(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3218 | { |
| 3219 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 3220 | switch(esp->msgout_len) { |
| 3221 | case 1: |
| 3222 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); |
| 3223 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3224 | break; |
| 3225 | |
| 3226 | case 2: |
| 3227 | if(esp->do_pio_cmds){ |
| 3228 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); |
| 3229 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); |
| 3230 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3231 | } else { |
| 3232 | esp->esp_command[0] = esp->cur_msgout[0]; |
| 3233 | esp->esp_command[1] = esp->cur_msgout[1]; |
| 3234 | esp->dma_setup(esp, esp->esp_command_dvma, 2, 0); |
| 3235 | esp_setcount(eregs, 2); |
| 3236 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); |
| 3237 | } |
| 3238 | break; |
| 3239 | |
| 3240 | case 4: |
| 3241 | esp->snip = 1; |
| 3242 | if(esp->do_pio_cmds){ |
| 3243 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); |
| 3244 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); |
| 3245 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); |
| 3246 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); |
| 3247 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3248 | } else { |
| 3249 | esp->esp_command[0] = esp->cur_msgout[0]; |
| 3250 | esp->esp_command[1] = esp->cur_msgout[1]; |
| 3251 | esp->esp_command[2] = esp->cur_msgout[2]; |
| 3252 | esp->esp_command[3] = esp->cur_msgout[3]; |
| 3253 | esp->dma_setup(esp, esp->esp_command_dvma, 4, 0); |
| 3254 | esp_setcount(eregs, 4); |
| 3255 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); |
| 3256 | } |
| 3257 | break; |
| 3258 | |
| 3259 | case 5: |
| 3260 | esp->snip = 1; |
| 3261 | if(esp->do_pio_cmds){ |
| 3262 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); |
| 3263 | esp_write(eregs->esp_fdata, esp->cur_msgout[1]); |
| 3264 | esp_write(eregs->esp_fdata, esp->cur_msgout[2]); |
| 3265 | esp_write(eregs->esp_fdata, esp->cur_msgout[3]); |
| 3266 | esp_write(eregs->esp_fdata, esp->cur_msgout[4]); |
| 3267 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3268 | } else { |
| 3269 | esp->esp_command[0] = esp->cur_msgout[0]; |
| 3270 | esp->esp_command[1] = esp->cur_msgout[1]; |
| 3271 | esp->esp_command[2] = esp->cur_msgout[2]; |
| 3272 | esp->esp_command[3] = esp->cur_msgout[3]; |
| 3273 | esp->esp_command[4] = esp->cur_msgout[4]; |
| 3274 | esp->dma_setup(esp, esp->esp_command_dvma, 5, 0); |
| 3275 | esp_setcount(eregs, 5); |
| 3276 | esp_cmd(esp, eregs, ESP_CMD_DMA | ESP_CMD_TI); |
| 3277 | } |
| 3278 | break; |
| 3279 | |
| 3280 | default: |
| 3281 | /* whoops */ |
| 3282 | ESPMISC(("bogus msgout sending NOP\n")); |
| 3283 | esp->cur_msgout[0] = NOP; |
| 3284 | esp_write(eregs->esp_fdata, esp->cur_msgout[0]); |
| 3285 | esp->msgout_len = 1; |
| 3286 | esp_cmd(esp, eregs, ESP_CMD_TI); |
| 3287 | break; |
| 3288 | } |
| 3289 | esp_advance_phase(esp->current_SC, in_msgoutdone); |
| 3290 | return do_intr_end; |
| 3291 | } |
| 3292 | |
| 3293 | static int esp_do_msgoutdone(struct NCR_ESP *esp, |
| 3294 | struct ESP_regs *eregs) |
| 3295 | { |
| 3296 | if((esp->msgout_len > 1) && esp->dma_barrier) |
| 3297 | esp->dma_barrier(esp); |
| 3298 | |
| 3299 | if(!(esp->ireg & ESP_INTR_DC)) { |
| 3300 | esp_cmd(esp, eregs, ESP_CMD_NULL); |
| 3301 | switch(esp->sreg & ESP_STAT_PMASK) { |
| 3302 | case ESP_MOP: |
| 3303 | /* whoops, parity error */ |
| 3304 | ESPLOG(("esp%d: still in msgout, parity error assumed\n", |
| 3305 | esp->esp_id)); |
| 3306 | if(esp->msgout_len > 1) |
| 3307 | esp_cmd(esp, eregs, ESP_CMD_SATN); |
| 3308 | esp_advance_phase(esp->current_SC, in_msgout); |
| 3309 | return do_work_bus; |
| 3310 | |
| 3311 | case ESP_DIP: |
| 3312 | break; |
| 3313 | |
| 3314 | default: |
| 3315 | if(!fcount(esp, eregs) && |
| 3316 | !(((struct esp_device *)esp->current_SC->device->hostdata)->sync_max_offset)) |
| 3317 | esp_cmd(esp, eregs, ESP_CMD_FLUSH); |
| 3318 | break; |
| 3319 | |
| 3320 | }; |
| 3321 | } |
| 3322 | |
| 3323 | /* If we sent out a synchronous negotiation message, update |
| 3324 | * our state. |
| 3325 | */ |
| 3326 | if(esp->cur_msgout[2] == EXTENDED_MESSAGE && |
| 3327 | esp->cur_msgout[4] == EXTENDED_SDTR) { |
| 3328 | esp->snip = 1; /* anal retentiveness... */ |
| 3329 | } |
| 3330 | |
| 3331 | esp->prevmsgout = esp->cur_msgout[0]; |
| 3332 | esp->msgout_len = 0; |
| 3333 | esp_advance_phase(esp->current_SC, in_the_dark); |
| 3334 | return esp_do_phase_determine(esp, eregs); |
| 3335 | } |
| 3336 | |
| 3337 | static int esp_bus_unexpected(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3338 | { |
| 3339 | ESPLOG(("esp%d: command in weird state %2x\n", |
| 3340 | esp->esp_id, esp->current_SC->SCp.phase)); |
| 3341 | return do_reset_bus; |
| 3342 | } |
| 3343 | |
| 3344 | static espfunc_t bus_vector[] = { |
| 3345 | esp_do_data_finale, |
| 3346 | esp_do_data_finale, |
| 3347 | esp_bus_unexpected, |
| 3348 | esp_do_msgin, |
| 3349 | esp_do_msgincont, |
| 3350 | esp_do_msgindone, |
| 3351 | esp_do_msgout, |
| 3352 | esp_do_msgoutdone, |
| 3353 | esp_do_cmdbegin, |
| 3354 | esp_do_cmddone, |
| 3355 | esp_do_status, |
| 3356 | esp_do_freebus, |
| 3357 | esp_do_phase_determine, |
| 3358 | esp_bus_unexpected, |
| 3359 | esp_bus_unexpected, |
| 3360 | esp_bus_unexpected, |
| 3361 | }; |
| 3362 | |
| 3363 | /* This is the second tier in our dual-level SCSI state machine. */ |
| 3364 | static int esp_work_bus(struct NCR_ESP *esp, struct ESP_regs *eregs) |
| 3365 | { |
| 3366 | Scsi_Cmnd *SCptr = esp->current_SC; |
| 3367 | unsigned int phase; |
| 3368 | |
| 3369 | ESPBUS(("esp_work_bus: ")); |
| 3370 | if(!SCptr) { |
| 3371 | ESPBUS(("reconnect\n")); |
| 3372 | return esp_do_reconnect(esp, eregs); |
| 3373 | } |
| 3374 | phase = SCptr->SCp.phase; |
| 3375 | if ((phase & 0xf0) == in_phases_mask) |
| 3376 | return bus_vector[(phase & 0x0f)](esp, eregs); |
| 3377 | else if((phase & 0xf0) == in_slct_mask) |
| 3378 | return esp_select_complete(esp, eregs); |
| 3379 | else |
| 3380 | return esp_bus_unexpected(esp, eregs); |
| 3381 | } |
| 3382 | |
| 3383 | static espfunc_t isvc_vector[] = { |
| 3384 | NULL, |
| 3385 | esp_do_phase_determine, |
| 3386 | esp_do_resetbus, |
| 3387 | esp_finish_reset, |
| 3388 | esp_work_bus |
| 3389 | }; |
| 3390 | |
| 3391 | /* Main interrupt handler for an esp adapter. */ |
| 3392 | void esp_handle(struct NCR_ESP *esp) |
| 3393 | { |
| 3394 | struct ESP_regs *eregs; |
| 3395 | Scsi_Cmnd *SCptr; |
| 3396 | int what_next = do_intr_end; |
| 3397 | eregs = esp->eregs; |
| 3398 | SCptr = esp->current_SC; |
| 3399 | |
| 3400 | if(esp->dma_irq_entry) |
| 3401 | esp->dma_irq_entry(esp); |
| 3402 | |
| 3403 | /* Check for errors. */ |
| 3404 | esp->sreg = esp_read(eregs->esp_status); |
| 3405 | esp->sreg &= (~ESP_STAT_INTR); |
| 3406 | esp->seqreg = (esp_read(eregs->esp_sstep) & ESP_STEP_VBITS); |
| 3407 | esp->ireg = esp_read(eregs->esp_intrpt); /* Unlatch intr and stat regs */ |
| 3408 | ESPIRQ(("handle_irq: [sreg<%02x> sstep<%02x> ireg<%02x>]\n", |
| 3409 | esp->sreg, esp->seqreg, esp->ireg)); |
| 3410 | if(esp->sreg & (ESP_STAT_SPAM)) { |
| 3411 | /* Gross error, could be due to one of: |
| 3412 | * |
| 3413 | * - top of fifo overwritten, could be because |
| 3414 | * we tried to do a synchronous transfer with |
| 3415 | * an offset greater than ESP fifo size |
| 3416 | * |
| 3417 | * - top of command register overwritten |
| 3418 | * |
| 3419 | * - DMA setup to go in one direction, SCSI |
| 3420 | * bus points in the other, whoops |
| 3421 | * |
| 3422 | * - weird phase change during asynchronous |
| 3423 | * data phase while we are initiator |
| 3424 | */ |
| 3425 | ESPLOG(("esp%d: Gross error sreg=%2x\n", esp->esp_id, esp->sreg)); |
| 3426 | |
| 3427 | /* If a command is live on the bus we cannot safely |
| 3428 | * reset the bus, so we'll just let the pieces fall |
| 3429 | * where they may. Here we are hoping that the |
| 3430 | * target will be able to cleanly go away soon |
| 3431 | * so we can safely reset things. |
| 3432 | */ |
| 3433 | if(!SCptr) { |
| 3434 | ESPLOG(("esp%d: No current cmd during gross error, " |
| 3435 | "resetting bus\n", esp->esp_id)); |
| 3436 | what_next = do_reset_bus; |
| 3437 | goto state_machine; |
| 3438 | } |
| 3439 | } |
| 3440 | |
| 3441 | /* No current cmd is only valid at this point when there are |
| 3442 | * commands off the bus or we are trying a reset. |
| 3443 | */ |
| 3444 | if(!SCptr && !esp->disconnected_SC && !(esp->ireg & ESP_INTR_SR)) { |
| 3445 | /* Panic is safe, since current_SC is null. */ |
| 3446 | ESPLOG(("esp%d: no command in esp_handle()\n", esp->esp_id)); |
| 3447 | panic("esp_handle: current_SC == penguin within interrupt!"); |
| 3448 | } |
| 3449 | |
| 3450 | if(esp->ireg & (ESP_INTR_IC)) { |
| 3451 | /* Illegal command fed to ESP. Outside of obvious |
| 3452 | * software bugs that could cause this, there is |
| 3453 | * a condition with ESP100 where we can confuse the |
| 3454 | * ESP into an erroneous illegal command interrupt |
| 3455 | * because it does not scrape the FIFO properly |
| 3456 | * for reselection. See esp100_reconnect_hwbug() |
| 3457 | * to see how we try very hard to avoid this. |
| 3458 | */ |
| 3459 | ESPLOG(("esp%d: invalid command\n", esp->esp_id)); |
| 3460 | |
| 3461 | esp_dump_state(esp, eregs); |
| 3462 | |
| 3463 | if(SCptr) { |
| 3464 | /* Devices with very buggy firmware can drop BSY |
| 3465 | * during a scatter list interrupt when using sync |
| 3466 | * mode transfers. We continue the transfer as |
| 3467 | * expected, the target drops the bus, the ESP |
| 3468 | * gets confused, and we get a illegal command |
| 3469 | * interrupt because the bus is in the disconnected |
| 3470 | * state now and ESP_CMD_TI is only allowed when |
| 3471 | * a nexus is alive on the bus. |
| 3472 | */ |
| 3473 | ESPLOG(("esp%d: Forcing async and disabling disconnect for " |
| 3474 | "target %d\n", esp->esp_id, SCptr->device->id)); |
| 3475 | SCptr->device->borken = 1; /* foo on you */ |
| 3476 | } |
| 3477 | |
| 3478 | what_next = do_reset_bus; |
| 3479 | } else if(!(esp->ireg & ~(ESP_INTR_FDONE | ESP_INTR_BSERV | ESP_INTR_DC))) { |
| 3480 | int phase; |
| 3481 | |
| 3482 | if(SCptr) { |
| 3483 | phase = SCptr->SCp.phase; |
| 3484 | if(phase & in_phases_mask) { |
| 3485 | what_next = esp_work_bus(esp, eregs); |
| 3486 | } else if(phase & in_slct_mask) { |
| 3487 | what_next = esp_select_complete(esp, eregs); |
| 3488 | } else { |
| 3489 | ESPLOG(("esp%d: interrupt for no good reason...\n", |
| 3490 | esp->esp_id)); |
| 3491 | what_next = do_intr_end; |
| 3492 | } |
| 3493 | } else { |
| 3494 | ESPLOG(("esp%d: BSERV or FDONE or DC while SCptr==NULL\n", |
| 3495 | esp->esp_id)); |
| 3496 | what_next = do_reset_bus; |
| 3497 | } |
| 3498 | } else if(esp->ireg & ESP_INTR_SR) { |
| 3499 | ESPLOG(("esp%d: SCSI bus reset interrupt\n", esp->esp_id)); |
| 3500 | what_next = do_reset_complete; |
| 3501 | } else if(esp->ireg & (ESP_INTR_S | ESP_INTR_SATN)) { |
| 3502 | ESPLOG(("esp%d: AIEEE we have been selected by another initiator!\n", |
| 3503 | esp->esp_id)); |
| 3504 | what_next = do_reset_bus; |
| 3505 | } else if(esp->ireg & ESP_INTR_RSEL) { |
| 3506 | if(!SCptr) { |
| 3507 | /* This is ok. */ |
| 3508 | what_next = esp_do_reconnect(esp, eregs); |
| 3509 | } else if(SCptr->SCp.phase & in_slct_mask) { |
| 3510 | /* Only selection code knows how to clean |
| 3511 | * up properly. |
| 3512 | */ |
| 3513 | ESPDISC(("Reselected during selection attempt\n")); |
| 3514 | what_next = esp_select_complete(esp, eregs); |
| 3515 | } else { |
| 3516 | ESPLOG(("esp%d: Reselected while bus is busy\n", |
| 3517 | esp->esp_id)); |
| 3518 | what_next = do_reset_bus; |
| 3519 | } |
| 3520 | } |
| 3521 | |
| 3522 | /* This is tier-one in our dual level SCSI state machine. */ |
| 3523 | state_machine: |
| 3524 | while(what_next != do_intr_end) { |
| 3525 | if (what_next >= do_phase_determine && |
| 3526 | what_next < do_intr_end) |
| 3527 | what_next = isvc_vector[what_next](esp, eregs); |
| 3528 | else { |
| 3529 | /* state is completely lost ;-( */ |
| 3530 | ESPLOG(("esp%d: interrupt engine loses state, resetting bus\n", |
| 3531 | esp->esp_id)); |
| 3532 | what_next = do_reset_bus; |
| 3533 | } |
| 3534 | } |
| 3535 | if(esp->dma_irq_exit) |
| 3536 | esp->dma_irq_exit(esp); |
| 3537 | } |
| 3538 | |
| 3539 | #ifndef CONFIG_SMP |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 3540 | irqreturn_t esp_intr(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3541 | { |
| 3542 | struct NCR_ESP *esp; |
| 3543 | unsigned long flags; |
| 3544 | int again; |
| 3545 | struct Scsi_Host *dev = dev_id; |
| 3546 | |
| 3547 | /* Handle all ESP interrupts showing at this IRQ level. */ |
| 3548 | spin_lock_irqsave(dev->host_lock, flags); |
| 3549 | repeat: |
| 3550 | again = 0; |
| 3551 | for_each_esp(esp) { |
| 3552 | #ifndef __mips__ |
| 3553 | if(((esp)->irq & 0xff) == irq) { |
| 3554 | #endif |
| 3555 | if(esp->dma_irq_p(esp)) { |
| 3556 | again = 1; |
| 3557 | |
| 3558 | esp->dma_ints_off(esp); |
| 3559 | |
| 3560 | ESPIRQ(("I%d(", esp->esp_id)); |
| 3561 | esp_handle(esp); |
| 3562 | ESPIRQ((")")); |
| 3563 | |
| 3564 | esp->dma_ints_on(esp); |
| 3565 | } |
| 3566 | #ifndef __mips__ |
| 3567 | } |
| 3568 | #endif |
| 3569 | } |
| 3570 | if(again) |
| 3571 | goto repeat; |
| 3572 | spin_unlock_irqrestore(dev->host_lock, flags); |
| 3573 | return IRQ_HANDLED; |
| 3574 | } |
| 3575 | #else |
| 3576 | /* For SMP we only service one ESP on the list list at our IRQ level! */ |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 3577 | irqreturn_t esp_intr(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3578 | { |
| 3579 | struct NCR_ESP *esp; |
| 3580 | unsigned long flags; |
| 3581 | struct Scsi_Host *dev = dev_id; |
| 3582 | |
| 3583 | /* Handle all ESP interrupts showing at this IRQ level. */ |
| 3584 | spin_lock_irqsave(dev->host_lock, flags); |
| 3585 | for_each_esp(esp) { |
| 3586 | if(((esp)->irq & 0xf) == irq) { |
| 3587 | if(esp->dma_irq_p(esp)) { |
| 3588 | esp->dma_ints_off(esp); |
| 3589 | |
| 3590 | ESPIRQ(("I[%d:%d](", |
| 3591 | smp_processor_id(), esp->esp_id)); |
| 3592 | esp_handle(esp); |
| 3593 | ESPIRQ((")")); |
| 3594 | |
| 3595 | esp->dma_ints_on(esp); |
| 3596 | goto out; |
| 3597 | } |
| 3598 | } |
| 3599 | } |
| 3600 | out: |
| 3601 | spin_unlock_irqrestore(dev->host_lock, flags); |
| 3602 | return IRQ_HANDLED; |
| 3603 | } |
| 3604 | #endif |
| 3605 | |
Christoph Hellwig | f64a181 | 2005-10-31 18:32:08 +0100 | [diff] [blame] | 3606 | int esp_slave_alloc(struct scsi_device *SDptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3607 | { |
| 3608 | struct esp_device *esp_dev = |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame^] | 3609 | kzalloc(sizeof(struct esp_device), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3610 | |
| 3611 | if (!esp_dev) |
| 3612 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3613 | SDptr->hostdata = esp_dev; |
| 3614 | return 0; |
| 3615 | } |
| 3616 | |
Christoph Hellwig | f64a181 | 2005-10-31 18:32:08 +0100 | [diff] [blame] | 3617 | void esp_slave_destroy(struct scsi_device *SDptr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3618 | { |
| 3619 | struct NCR_ESP *esp = (struct NCR_ESP *) SDptr->host->hostdata; |
| 3620 | |
Jeff Garzik | 422c0d6 | 2005-10-24 18:05:09 -0400 | [diff] [blame] | 3621 | esp->targets_present &= ~(1 << sdev_id(SDptr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3622 | kfree(SDptr->hostdata); |
| 3623 | SDptr->hostdata = NULL; |
| 3624 | } |
| 3625 | |
| 3626 | #ifdef MODULE |
| 3627 | int init_module(void) { return 0; } |
| 3628 | void cleanup_module(void) {} |
| 3629 | void esp_release(void) |
| 3630 | { |
| 3631 | esps_in_use--; |
| 3632 | esps_running = esps_in_use; |
| 3633 | } |
| 3634 | #endif |
| 3635 | |
| 3636 | EXPORT_SYMBOL(esp_abort); |
| 3637 | EXPORT_SYMBOL(esp_allocate); |
| 3638 | EXPORT_SYMBOL(esp_deallocate); |
| 3639 | EXPORT_SYMBOL(esp_initialize); |
| 3640 | EXPORT_SYMBOL(esp_intr); |
| 3641 | EXPORT_SYMBOL(esp_queue); |
| 3642 | EXPORT_SYMBOL(esp_reset); |
| 3643 | EXPORT_SYMBOL(esp_slave_alloc); |
| 3644 | EXPORT_SYMBOL(esp_slave_destroy); |
| 3645 | EXPORT_SYMBOL(esps_in_use); |
| 3646 | |
| 3647 | MODULE_LICENSE("GPL"); |