1 /* esp_scsi.h: Defines and structures for the ESP driver. 2 * 3 * Copyright (C) 2007 David S. Miller (davem@davemloft.net) 4 */ 5 6 #ifndef _ESP_SCSI_H 7 #define _ESP_SCSI_H 8 9 /* Access Description Offset */ 10 #define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */ 11 #define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */ 12 #define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */ 13 #define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */ 14 #define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */ 15 #define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */ 16 #define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */ 17 #define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */ 18 #define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */ 19 #define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */ 20 #define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */ 21 #define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */ 22 #define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */ 23 #define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */ 24 #define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */ 25 #define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */ 26 #define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */ 27 #define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */ 28 #define ESP_CFG4 0x0dUL /* rw Fourth cfg register 0x34 */ 29 #define ESP_TCHI 0x0eUL /* rw High bits transf count 0x38 */ 30 #define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */ 31 #define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */ 32 #define ESP_FGRND 0x0fUL /* rw Data base for fifo 0x3c */ 33 #define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */ 34 35 #define SBUS_ESP_REG_SIZE 0x40UL 36 37 /* Bitfield meanings for the above registers. */ 38 39 /* ESP config reg 1, read-write, found on all ESP chips */ 40 #define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */ 41 #define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */ 42 #define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */ 43 #define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */ 44 #define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */ 45 #define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */ 46 47 /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */ 48 #define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */ 49 #define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */ 50 #define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */ 51 #define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tgtmode) */ 52 #define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */ 53 #define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */ 54 #define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */ 55 #define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */ 56 #define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,216) */ 57 #define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */ 58 #define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */ 59 #define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */ 60 #define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */ 61 62 /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */ 63 #define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */ 64 #define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */ 65 #define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */ 66 #define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */ 67 #define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */ 68 #define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */ 69 #define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */ 70 #define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */ 71 #define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */ 72 #define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */ 73 #define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */ 74 #define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */ 75 #define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */ 76 #define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */ 77 #define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */ 78 #define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */ 79 80 /* ESP config register 4 read-write, found only on am53c974 chips */ 81 #define ESP_CONFIG4_RADE 0x04 /* Active negation */ 82 #define ESP_CONFIG4_RAE 0x08 /* Active negation on REQ and ACK */ 83 #define ESP_CONFIG4_PWD 0x20 /* Reduced power feature */ 84 #define ESP_CONFIG4_GE0 0x40 /* Glitch eater bit 0 */ 85 #define ESP_CONFIG4_GE1 0x80 /* Glitch eater bit 1 */ 86 87 #define ESP_CONFIG_GE_12NS (0) 88 #define ESP_CONFIG_GE_25NS (ESP_CONFIG_GE1) 89 #define ESP_CONFIG_GE_35NS (ESP_CONFIG_GE0) 90 #define ESP_CONFIG_GE_0NS (ESP_CONFIG_GE0 | ESP_CONFIG_GE1) 91 92 /* ESP command register read-write */ 93 /* Group 1 commands: These may be sent at any point in time to the ESP 94 * chip. None of them can generate interrupts 'cept 95 * the "SCSI bus reset" command if you have not disabled 96 * SCSI reset interrupts in the config1 ESP register. 97 */ 98 #define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */ 99 #define ESP_CMD_FLUSH 0x01 /* FIFO Flush */ 100 #define ESP_CMD_RC 0x02 /* Chip reset */ 101 #define ESP_CMD_RS 0x03 /* SCSI bus reset */ 102 103 /* Group 2 commands: ESP must be an initiator and connected to a target 104 * for these commands to work. 105 */ 106 #define ESP_CMD_TI 0x10 /* Transfer Information */ 107 #define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */ 108 #define ESP_CMD_MOK 0x12 /* Message okie-dokie */ 109 #define ESP_CMD_TPAD 0x18 /* Transfer Pad */ 110 #define ESP_CMD_SATN 0x1a /* Set ATN */ 111 #define ESP_CMD_RATN 0x1b /* De-assert ATN */ 112 113 /* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected 114 * to a target as the initiator for these commands to work. 115 */ 116 #define ESP_CMD_SMSG 0x20 /* Send message */ 117 #define ESP_CMD_SSTAT 0x21 /* Send status */ 118 #define ESP_CMD_SDATA 0x22 /* Send data */ 119 #define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */ 120 #define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */ 121 #define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */ 122 #define ESP_CMD_DCNCT 0x27 /* Disconnect */ 123 #define ESP_CMD_RMSG 0x28 /* Receive Message */ 124 #define ESP_CMD_RCMD 0x29 /* Receive Command */ 125 #define ESP_CMD_RDATA 0x2a /* Receive Data */ 126 #define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */ 127 128 /* Group 4 commands: The ESP must be in the disconnected state and must 129 * not be connected to any targets as initiator for 130 * these commands to work. 131 */ 132 #define ESP_CMD_RSEL 0x40 /* Reselect */ 133 #define ESP_CMD_SEL 0x41 /* Select w/o ATN */ 134 #define ESP_CMD_SELA 0x42 /* Select w/ATN */ 135 #define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */ 136 #define ESP_CMD_ESEL 0x44 /* Enable selection */ 137 #define ESP_CMD_DSEL 0x45 /* Disable selections */ 138 #define ESP_CMD_SA3 0x46 /* Select w/ATN3 */ 139 #define ESP_CMD_RSEL3 0x47 /* Reselect3 */ 140 141 /* This bit enables the ESP's DMA on the SBus */ 142 #define ESP_CMD_DMA 0x80 /* Do DMA? */ 143 144 /* ESP status register read-only */ 145 #define ESP_STAT_PIO 0x01 /* IO phase bit */ 146 #define ESP_STAT_PCD 0x02 /* CD phase bit */ 147 #define ESP_STAT_PMSG 0x04 /* MSG phase bit */ 148 #define ESP_STAT_PMASK 0x07 /* Mask of phase bits */ 149 #define ESP_STAT_TDONE 0x08 /* Transfer Completed */ 150 #define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */ 151 #define ESP_STAT_PERR 0x20 /* Parity error */ 152 #define ESP_STAT_SPAM 0x40 /* Real bad error */ 153 /* This indicates the 'interrupt pending' condition on esp236, it is a reserved 154 * bit on other revs of the ESP. 155 */ 156 #define ESP_STAT_INTR 0x80 /* Interrupt */ 157 158 /* The status register can be masked with ESP_STAT_PMASK and compared 159 * with the following values to determine the current phase the ESP 160 * (at least thinks it) is in. For our purposes we also add our own 161 * software 'done' bit for our phase management engine. 162 */ 163 #define ESP_DOP (0) /* Data Out */ 164 #define ESP_DIP (ESP_STAT_PIO) /* Data In */ 165 #define ESP_CMDP (ESP_STAT_PCD) /* Command */ 166 #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */ 167 #define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */ 168 #define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */ 169 170 /* HME only: status 2 register */ 171 #define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */ 172 #define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */ 173 #define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */ 174 #define ESP_STAT2_CREGA 0x08 /* The command reg is active now */ 175 #define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */ 176 #define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */ 177 #define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */ 178 #define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */ 179 180 /* ESP interrupt register read-only */ 181 #define ESP_INTR_S 0x01 /* Select w/o ATN */ 182 #define ESP_INTR_SATN 0x02 /* Select w/ATN */ 183 #define ESP_INTR_RSEL 0x04 /* Reselected */ 184 #define ESP_INTR_FDONE 0x08 /* Function done */ 185 #define ESP_INTR_BSERV 0x10 /* Bus service */ 186 #define ESP_INTR_DC 0x20 /* Disconnect */ 187 #define ESP_INTR_IC 0x40 /* Illegal command given */ 188 #define ESP_INTR_SR 0x80 /* SCSI bus reset detected */ 189 190 /* ESP sequence step register read-only */ 191 #define ESP_STEP_VBITS 0x07 /* Valid bits */ 192 #define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */ 193 #define ESP_STEP_SID 0x01 /* One msg byte sent */ 194 #define ESP_STEP_NCMD 0x02 /* Was not in command phase */ 195 #define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd 196 * bytes to be lost 197 */ 198 #define ESP_STEP_FINI4 0x04 /* Command was sent ok */ 199 200 /* Ho hum, some ESP's set the step register to this as well... */ 201 #define ESP_STEP_FINI5 0x05 202 #define ESP_STEP_FINI6 0x06 203 #define ESP_STEP_FINI7 0x07 204 205 /* ESP chip-test register read-write */ 206 #define ESP_TEST_TARG 0x01 /* Target test mode */ 207 #define ESP_TEST_INI 0x02 /* Initiator test mode */ 208 #define ESP_TEST_TS 0x04 /* Tristate test mode */ 209 210 /* ESP unique ID register read-only, found on fas236+fas100a only */ 211 #define ESP_UID_F100A 0x00 /* ESP FAS100A */ 212 #define ESP_UID_F236 0x02 /* ESP FAS236 */ 213 #define ESP_UID_REV 0x07 /* ESP revision */ 214 #define ESP_UID_FAM 0xf8 /* ESP family */ 215 216 /* ESP fifo flags register read-only */ 217 /* Note that the following implies a 16 byte FIFO on the ESP. */ 218 #define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */ 219 #define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */ 220 #define ESP_FF_SSTEP 0xe0 /* Sequence step */ 221 222 /* ESP clock conversion factor register write-only */ 223 #define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */ 224 #define ESP_CCF_NEVER 0x01 /* Set it to this and die */ 225 #define ESP_CCF_F2 0x02 /* 10MHz */ 226 #define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */ 227 #define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */ 228 #define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */ 229 #define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */ 230 #define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */ 231 232 /* HME only... */ 233 #define ESP_BUSID_RESELID 0x10 234 #define ESP_BUSID_CTR32BIT 0x40 235 236 #define ESP_BUS_TIMEOUT 250 /* In milli-seconds */ 237 #define ESP_TIMEO_CONST 8192 238 #define ESP_NEG_DEFP(mhz, cfact) \ 239 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact))) 240 #define ESP_HZ_TO_CYCLE(hertz) ((1000000000) / ((hertz) / 1000)) 241 #define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000)) 242 243 /* For slow to medium speed input clock rates we shoot for 5mb/s, but for high 244 * input clock rates we try to do 10mb/s although I don't think a transfer can 245 * even run that fast with an ESP even with DMA2 scatter gather pipelining. 246 */ 247 #define SYNC_DEFP_SLOW 0x32 /* 5mb/s */ 248 #define SYNC_DEFP_FAST 0x19 /* 10mb/s */ 249 250 struct esp_cmd_priv { 251 union { 252 dma_addr_t dma_addr; 253 int num_sg; 254 } u; 255 256 int cur_residue; 257 struct scatterlist *cur_sg; 258 int tot_residue; 259 }; 260 #define ESP_CMD_PRIV(CMD) ((struct esp_cmd_priv *)(&(CMD)->SCp)) 261 262 enum esp_rev { 263 ESP100 = 0x00, /* NCR53C90 - very broken */ 264 ESP100A = 0x01, /* NCR53C90A */ 265 ESP236 = 0x02, 266 FAS236 = 0x03, 267 FAS100A = 0x04, 268 FAST = 0x05, 269 FASHME = 0x06, 270 PCSCSI = 0x07, /* AM53c974 */ 271 }; 272 273 struct esp_cmd_entry { 274 struct list_head list; 275 276 struct scsi_cmnd *cmd; 277 278 unsigned int saved_cur_residue; 279 struct scatterlist *saved_cur_sg; 280 unsigned int saved_tot_residue; 281 282 u8 flags; 283 #define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */ 284 #define ESP_CMD_FLAG_ABORT 0x02 /* being aborted */ 285 #define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */ 286 #define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */ 287 288 u8 tag[2]; 289 u8 orig_tag[2]; 290 291 u8 status; 292 u8 message; 293 294 unsigned char *sense_ptr; 295 unsigned char *saved_sense_ptr; 296 dma_addr_t sense_dma; 297 298 struct completion *eh_done; 299 }; 300 301 #define ESP_DEFAULT_TAGS 16 302 303 #define ESP_MAX_TARGET 16 304 #define ESP_MAX_LUN 8 305 #define ESP_MAX_TAG 256 306 307 struct esp_lun_data { 308 struct esp_cmd_entry *non_tagged_cmd; 309 int num_tagged; 310 int hold; 311 struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG]; 312 }; 313 314 struct esp_target_data { 315 /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which 316 * match the currently negotiated settings for this target. The SCSI 317 * protocol values are maintained in spi_{offset,period,wide}(starget). 318 */ 319 u8 esp_period; 320 u8 esp_offset; 321 u8 esp_config3; 322 323 u8 flags; 324 #define ESP_TGT_WIDE 0x01 325 #define ESP_TGT_DISCONNECT 0x02 326 #define ESP_TGT_NEGO_WIDE 0x04 327 #define ESP_TGT_NEGO_SYNC 0x08 328 #define ESP_TGT_CHECK_NEGO 0x40 329 #define ESP_TGT_BROKEN 0x80 330 331 /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this 332 * device we will try to negotiate the following parameters. 333 */ 334 u8 nego_goal_period; 335 u8 nego_goal_offset; 336 u8 nego_goal_width; 337 u8 nego_goal_tags; 338 339 struct scsi_target *starget; 340 }; 341 342 struct esp_event_ent { 343 u8 type; 344 #define ESP_EVENT_TYPE_EVENT 0x01 345 #define ESP_EVENT_TYPE_CMD 0x02 346 u8 val; 347 348 u8 sreg; 349 u8 seqreg; 350 u8 sreg2; 351 u8 ireg; 352 u8 select_state; 353 u8 event; 354 u8 __pad; 355 }; 356 357 struct esp; 358 struct esp_driver_ops { 359 /* Read and write the ESP 8-bit registers. On some 360 * applications of the ESP chip the registers are at 4-byte 361 * instead of 1-byte intervals. 362 */ 363 void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg); 364 u8 (*esp_read8)(struct esp *esp, unsigned long reg); 365 366 /* Map and unmap DMA memory. Eventually the driver will be 367 * converted to the generic DMA API as soon as SBUS is able to 368 * cope with that. At such time we can remove this. 369 */ 370 dma_addr_t (*map_single)(struct esp *esp, void *buf, 371 size_t sz, int dir); 372 int (*map_sg)(struct esp *esp, struct scatterlist *sg, 373 int num_sg, int dir); 374 void (*unmap_single)(struct esp *esp, dma_addr_t addr, 375 size_t sz, int dir); 376 void (*unmap_sg)(struct esp *esp, struct scatterlist *sg, 377 int num_sg, int dir); 378 379 /* Return non-zero if there is an IRQ pending. Usually this 380 * status bit lives in the DMA controller sitting in front of 381 * the ESP. This has to be accurate or else the ESP interrupt 382 * handler will not run. 383 */ 384 int (*irq_pending)(struct esp *esp); 385 386 /* Return the maximum allowable size of a DMA transfer for a 387 * given buffer. 388 */ 389 u32 (*dma_length_limit)(struct esp *esp, u32 dma_addr, 390 u32 dma_len); 391 392 /* Reset the DMA engine entirely. On return, ESP interrupts 393 * should be enabled. Often the interrupt enabling is 394 * controlled in the DMA engine. 395 */ 396 void (*reset_dma)(struct esp *esp); 397 398 /* Drain any pending DMA in the DMA engine after a transfer. 399 * This is for writes to memory. 400 */ 401 void (*dma_drain)(struct esp *esp); 402 403 /* Invalidate the DMA engine after a DMA transfer. */ 404 void (*dma_invalidate)(struct esp *esp); 405 406 /* Setup an ESP command that will use a DMA transfer. 407 * The 'esp_count' specifies what transfer length should be 408 * programmed into the ESP transfer counter registers, whereas 409 * the 'dma_count' is the length that should be programmed into 410 * the DMA controller. Usually they are the same. If 'write' 411 * is non-zero, this transfer is a write into memory. 'cmd' 412 * holds the ESP command that should be issued by calling 413 * scsi_esp_cmd() at the appropriate time while programming 414 * the DMA hardware. 415 */ 416 void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count, 417 u32 dma_count, int write, u8 cmd); 418 419 /* Return non-zero if the DMA engine is reporting an error 420 * currently. 421 */ 422 int (*dma_error)(struct esp *esp); 423 }; 424 425 #define ESP_MAX_MSG_SZ 8 426 #define ESP_EVENT_LOG_SZ 32 427 428 #define ESP_QUICKIRQ_LIMIT 100 429 #define ESP_RESELECT_TAG_LIMIT 2500 430 431 struct esp { 432 void __iomem *regs; 433 void __iomem *dma_regs; 434 435 const struct esp_driver_ops *ops; 436 437 struct Scsi_Host *host; 438 void *dev; 439 440 struct esp_cmd_entry *active_cmd; 441 442 struct list_head queued_cmds; 443 struct list_head active_cmds; 444 445 u8 *command_block; 446 dma_addr_t command_block_dma; 447 448 unsigned int data_dma_len; 449 450 /* The following are used to determine the cause of an IRQ. Upon every 451 * IRQ entry we synchronize these with the hardware registers. 452 */ 453 u8 sreg; 454 u8 seqreg; 455 u8 sreg2; 456 u8 ireg; 457 458 u32 prev_hme_dmacsr; 459 u8 prev_soff; 460 u8 prev_stp; 461 u8 prev_cfg3; 462 u8 num_tags; 463 464 struct list_head esp_cmd_pool; 465 466 struct esp_target_data target[ESP_MAX_TARGET]; 467 468 int fifo_cnt; 469 u8 fifo[16]; 470 471 struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ]; 472 int esp_event_cur; 473 474 u8 msg_out[ESP_MAX_MSG_SZ]; 475 int msg_out_len; 476 477 u8 msg_in[ESP_MAX_MSG_SZ]; 478 int msg_in_len; 479 480 u8 bursts; 481 u8 config1; 482 u8 config2; 483 u8 config4; 484 485 u8 scsi_id; 486 u32 scsi_id_mask; 487 488 enum esp_rev rev; 489 490 u32 flags; 491 #define ESP_FLAG_DIFFERENTIAL 0x00000001 492 #define ESP_FLAG_RESETTING 0x00000002 493 #define ESP_FLAG_DOING_SLOWCMD 0x00000004 494 #define ESP_FLAG_WIDE_CAPABLE 0x00000008 495 #define ESP_FLAG_QUICKIRQ_CHECK 0x00000010 496 #define ESP_FLAG_DISABLE_SYNC 0x00000020 497 #define ESP_FLAG_USE_FIFO 0x00000040 498 499 u8 select_state; 500 #define ESP_SELECT_NONE 0x00 /* Not selecting */ 501 #define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */ 502 #define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */ 503 504 /* When we are not selecting, we are expecting an event. */ 505 u8 event; 506 #define ESP_EVENT_NONE 0x00 507 #define ESP_EVENT_CMD_START 0x01 508 #define ESP_EVENT_CMD_DONE 0x02 509 #define ESP_EVENT_DATA_IN 0x03 510 #define ESP_EVENT_DATA_OUT 0x04 511 #define ESP_EVENT_DATA_DONE 0x05 512 #define ESP_EVENT_MSGIN 0x06 513 #define ESP_EVENT_MSGIN_MORE 0x07 514 #define ESP_EVENT_MSGIN_DONE 0x08 515 #define ESP_EVENT_MSGOUT 0x09 516 #define ESP_EVENT_MSGOUT_DONE 0x0a 517 #define ESP_EVENT_STATUS 0x0b 518 #define ESP_EVENT_FREE_BUS 0x0c 519 #define ESP_EVENT_CHECK_PHASE 0x0d 520 #define ESP_EVENT_RESET 0x10 521 522 /* Probed in esp_get_clock_params() */ 523 u32 cfact; 524 u32 cfreq; 525 u32 ccycle; 526 u32 ctick; 527 u32 neg_defp; 528 u32 sync_defp; 529 530 /* Computed in esp_reset_esp() */ 531 u32 max_period; 532 u32 min_period; 533 u32 radelay; 534 535 /* Slow command state. */ 536 u8 *cmd_bytes_ptr; 537 int cmd_bytes_left; 538 539 struct completion *eh_reset; 540 541 void *dma; 542 int dmarev; 543 }; 544 545 /* A front-end driver for the ESP chip should do the following in 546 * it's device probe routine: 547 * 1) Allocate the host and private area using scsi_host_alloc() 548 * with size 'sizeof(struct esp)'. The first argument to 549 * scsi_host_alloc() should be &scsi_esp_template. 550 * 2) Set host->max_id as appropriate. 551 * 3) Set esp->host to the scsi_host itself, and esp->dev 552 * to the device object pointer. 553 * 4) Hook up esp->ops to the front-end implementation. 554 * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE 555 * in esp->flags. 556 * 6) Map the DMA and ESP chip registers. 557 * 7) DMA map the ESP command block, store the DMA address 558 * in esp->command_block_dma. 559 * 8) Register the scsi_esp_intr() interrupt handler. 560 * 9) Probe for and provide the following chip properties: 561 * esp->scsi_id (assign to esp->host->this_id too) 562 * esp->scsi_id_mask 563 * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL 564 * esp->cfreq 565 * DMA burst bit mask in esp->bursts, if necessary 566 * 10) Perform any actions necessary before the ESP device can 567 * be programmed for the first time. On some configs, for 568 * example, the DMA engine has to be reset before ESP can 569 * be programmed. 570 * 11) If necessary, call dev_set_drvdata() as needed. 571 * 12) Call scsi_esp_register() with prepared 'esp' structure 572 * and a device pointer if possible. 573 * 13) Check scsi_esp_register() return value, release all resources 574 * if an error was returned. 575 */ 576 extern struct scsi_host_template scsi_esp_template; 577 extern int scsi_esp_register(struct esp *, struct device *); 578 579 extern void scsi_esp_unregister(struct esp *); 580 extern irqreturn_t scsi_esp_intr(int, void *); 581 extern void scsi_esp_cmd(struct esp *, u8); 582 583 #endif /* !(_ESP_SCSI_H) */ 584