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 250struct 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 262enum 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 273struct 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 307struct 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 314struct 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 342struct 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 357struct esp; 358struct 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 431struct 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 */ 576extern struct scsi_host_template scsi_esp_template; 577extern int scsi_esp_register(struct esp *, struct device *); 578 579extern void scsi_esp_unregister(struct esp *); 580extern irqreturn_t scsi_esp_intr(int, void *); 581extern void scsi_esp_cmd(struct esp *, u8); 582 583#endif /* !(_ESP_SCSI_H) */ 584