1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* esp_scsi.h: Defines and structures for the ESP driver. 3 * 4 * Copyright (C) 2007 David S. Miller (davem@davemloft.net) 5 */ 6 7 #ifndef _ESP_SCSI_H 8 #define _ESP_SCSI_H 9 10 /* Access Description Offset */ 11 #define ESP_TCLOW 0x00UL /* rw Low bits transfer count 0x00 */ 12 #define ESP_TCMED 0x01UL /* rw Mid bits transfer count 0x04 */ 13 #define ESP_FDATA 0x02UL /* rw FIFO data bits 0x08 */ 14 #define ESP_CMD 0x03UL /* rw SCSI command bits 0x0c */ 15 #define ESP_STATUS 0x04UL /* ro ESP status register 0x10 */ 16 #define ESP_BUSID ESP_STATUS /* wo BusID for sel/resel 0x10 */ 17 #define ESP_INTRPT 0x05UL /* ro Kind of interrupt 0x14 */ 18 #define ESP_TIMEO ESP_INTRPT /* wo Timeout for sel/resel 0x14 */ 19 #define ESP_SSTEP 0x06UL /* ro Sequence step register 0x18 */ 20 #define ESP_STP ESP_SSTEP /* wo Transfer period/sync 0x18 */ 21 #define ESP_FFLAGS 0x07UL /* ro Bits current FIFO info 0x1c */ 22 #define ESP_SOFF ESP_FFLAGS /* wo Sync offset 0x1c */ 23 #define ESP_CFG1 0x08UL /* rw First cfg register 0x20 */ 24 #define ESP_CFACT 0x09UL /* wo Clock conv factor 0x24 */ 25 #define ESP_STATUS2 ESP_CFACT /* ro HME status2 register 0x24 */ 26 #define ESP_CTEST 0x0aUL /* wo Chip test register 0x28 */ 27 #define ESP_CFG2 0x0bUL /* rw Second cfg register 0x2c */ 28 #define ESP_CFG3 0x0cUL /* rw Third cfg register 0x30 */ 29 #define ESP_CFG4 0x0dUL /* rw Fourth cfg register 0x34 */ 30 #define ESP_TCHI 0x0eUL /* rw High bits transf count 0x38 */ 31 #define ESP_UID ESP_TCHI /* ro Unique ID code 0x38 */ 32 #define FAS_RLO ESP_TCHI /* rw HME extended counter 0x38 */ 33 #define ESP_FGRND 0x0fUL /* rw Data base for fifo 0x3c */ 34 #define FAS_RHI ESP_FGRND /* rw HME extended counter 0x3c */ 35 36 #define SBUS_ESP_REG_SIZE 0x40UL 37 38 /* Bitfield meanings for the above registers. */ 39 40 /* ESP config reg 1, read-write, found on all ESP chips */ 41 #define ESP_CONFIG1_ID 0x07 /* My BUS ID bits */ 42 #define ESP_CONFIG1_CHTEST 0x08 /* Enable ESP chip tests */ 43 #define ESP_CONFIG1_PENABLE 0x10 /* Enable parity checks */ 44 #define ESP_CONFIG1_PARTEST 0x20 /* Parity test mode enabled? */ 45 #define ESP_CONFIG1_SRRDISAB 0x40 /* Disable SCSI reset reports */ 46 #define ESP_CONFIG1_SLCABLE 0x80 /* Enable slow cable mode */ 47 48 /* ESP config reg 2, read-write, found only on esp100a+esp200+esp236 chips */ 49 #define ESP_CONFIG2_DMAPARITY 0x01 /* enable DMA Parity (200,236) */ 50 #define ESP_CONFIG2_REGPARITY 0x02 /* enable reg Parity (200,236) */ 51 #define ESP_CONFIG2_BADPARITY 0x04 /* Bad parity target abort */ 52 #define ESP_CONFIG2_SCSI2ENAB 0x08 /* Enable SCSI-2 features (tgtmode) */ 53 #define ESP_CONFIG2_HI 0x10 /* High Impedance DREQ ??? */ 54 #define ESP_CONFIG2_HMEFENAB 0x10 /* HME features enable */ 55 #define ESP_CONFIG2_BCM 0x20 /* Enable byte-ctrl (236) */ 56 #define ESP_CONFIG2_DISPINT 0x20 /* Disable pause irq (hme) */ 57 #define ESP_CONFIG2_FENAB 0x40 /* Enable features (fas100,216) */ 58 #define ESP_CONFIG2_SPL 0x40 /* Enable status-phase latch (236) */ 59 #define ESP_CONFIG2_MKDONE 0x40 /* HME magic feature */ 60 #define ESP_CONFIG2_HME32 0x80 /* HME 32 extended */ 61 #define ESP_CONFIG2_MAGIC 0xe0 /* Invalid bits... */ 62 63 /* ESP config register 3 read-write, found only esp236+fas236+fas100a+hme chips */ 64 #define ESP_CONFIG3_FCLOCK 0x01 /* FAST SCSI clock rate (esp100a/hme) */ 65 #define ESP_CONFIG3_TEM 0x01 /* Enable thresh-8 mode (esp/fas236) */ 66 #define ESP_CONFIG3_FAST 0x02 /* Enable FAST SCSI (esp100a/hme) */ 67 #define ESP_CONFIG3_ADMA 0x02 /* Enable alternate-dma (esp/fas236) */ 68 #define ESP_CONFIG3_TENB 0x04 /* group2 SCSI2 support (esp100a/hme) */ 69 #define ESP_CONFIG3_SRB 0x04 /* Save residual byte (esp/fas236) */ 70 #define ESP_CONFIG3_TMS 0x08 /* Three-byte msg's ok (esp100a/hme) */ 71 #define ESP_CONFIG3_FCLK 0x08 /* Fast SCSI clock rate (esp/fas236) */ 72 #define ESP_CONFIG3_IDMSG 0x10 /* ID message checking (esp100a/hme) */ 73 #define ESP_CONFIG3_FSCSI 0x10 /* Enable FAST SCSI (esp/fas236) */ 74 #define ESP_CONFIG3_GTM 0x20 /* group2 SCSI2 support (esp/fas236) */ 75 #define ESP_CONFIG3_IDBIT3 0x20 /* Bit 3 of HME SCSI-ID (hme) */ 76 #define ESP_CONFIG3_TBMS 0x40 /* Three-byte msg's ok (esp/fas236) */ 77 #define ESP_CONFIG3_EWIDE 0x40 /* Enable Wide-SCSI (hme) */ 78 #define ESP_CONFIG3_IMS 0x80 /* ID msg chk'ng (esp/fas236) */ 79 #define ESP_CONFIG3_OBPUSH 0x80 /* Push odd-byte to dma (hme) */ 80 81 /* ESP config register 4 read-write, found only on am53c974 chips */ 82 #define ESP_CONFIG4_RADE 0x04 /* Active negation */ 83 #define ESP_CONFIG4_RAE 0x08 /* Active negation on REQ and ACK */ 84 #define ESP_CONFIG4_PWD 0x20 /* Reduced power feature */ 85 #define ESP_CONFIG4_GE0 0x40 /* Glitch eater bit 0 */ 86 #define ESP_CONFIG4_GE1 0x80 /* Glitch eater bit 1 */ 87 88 #define ESP_CONFIG_GE_12NS (0) 89 #define ESP_CONFIG_GE_25NS (ESP_CONFIG_GE1) 90 #define ESP_CONFIG_GE_35NS (ESP_CONFIG_GE0) 91 #define ESP_CONFIG_GE_0NS (ESP_CONFIG_GE0 | ESP_CONFIG_GE1) 92 93 /* ESP command register read-write */ 94 /* Group 1 commands: These may be sent at any point in time to the ESP 95 * chip. None of them can generate interrupts 'cept 96 * the "SCSI bus reset" command if you have not disabled 97 * SCSI reset interrupts in the config1 ESP register. 98 */ 99 #define ESP_CMD_NULL 0x00 /* Null command, ie. a nop */ 100 #define ESP_CMD_FLUSH 0x01 /* FIFO Flush */ 101 #define ESP_CMD_RC 0x02 /* Chip reset */ 102 #define ESP_CMD_RS 0x03 /* SCSI bus reset */ 103 104 /* Group 2 commands: ESP must be an initiator and connected to a target 105 * for these commands to work. 106 */ 107 #define ESP_CMD_TI 0x10 /* Transfer Information */ 108 #define ESP_CMD_ICCSEQ 0x11 /* Initiator cmd complete sequence */ 109 #define ESP_CMD_MOK 0x12 /* Message okie-dokie */ 110 #define ESP_CMD_TPAD 0x18 /* Transfer Pad */ 111 #define ESP_CMD_SATN 0x1a /* Set ATN */ 112 #define ESP_CMD_RATN 0x1b /* De-assert ATN */ 113 114 /* Group 3 commands: ESP must be in the MSGOUT or MSGIN state and be connected 115 * to a target as the initiator for these commands to work. 116 */ 117 #define ESP_CMD_SMSG 0x20 /* Send message */ 118 #define ESP_CMD_SSTAT 0x21 /* Send status */ 119 #define ESP_CMD_SDATA 0x22 /* Send data */ 120 #define ESP_CMD_DSEQ 0x23 /* Discontinue Sequence */ 121 #define ESP_CMD_TSEQ 0x24 /* Terminate Sequence */ 122 #define ESP_CMD_TCCSEQ 0x25 /* Target cmd cmplt sequence */ 123 #define ESP_CMD_DCNCT 0x27 /* Disconnect */ 124 #define ESP_CMD_RMSG 0x28 /* Receive Message */ 125 #define ESP_CMD_RCMD 0x29 /* Receive Command */ 126 #define ESP_CMD_RDATA 0x2a /* Receive Data */ 127 #define ESP_CMD_RCSEQ 0x2b /* Receive cmd sequence */ 128 129 /* Group 4 commands: The ESP must be in the disconnected state and must 130 * not be connected to any targets as initiator for 131 * these commands to work. 132 */ 133 #define ESP_CMD_RSEL 0x40 /* Reselect */ 134 #define ESP_CMD_SEL 0x41 /* Select w/o ATN */ 135 #define ESP_CMD_SELA 0x42 /* Select w/ATN */ 136 #define ESP_CMD_SELAS 0x43 /* Select w/ATN & STOP */ 137 #define ESP_CMD_ESEL 0x44 /* Enable selection */ 138 #define ESP_CMD_DSEL 0x45 /* Disable selections */ 139 #define ESP_CMD_SA3 0x46 /* Select w/ATN3 */ 140 #define ESP_CMD_RSEL3 0x47 /* Reselect3 */ 141 142 /* This bit enables the ESP's DMA on the SBus */ 143 #define ESP_CMD_DMA 0x80 /* Do DMA? */ 144 145 /* ESP status register read-only */ 146 #define ESP_STAT_PIO 0x01 /* IO phase bit */ 147 #define ESP_STAT_PCD 0x02 /* CD phase bit */ 148 #define ESP_STAT_PMSG 0x04 /* MSG phase bit */ 149 #define ESP_STAT_PMASK 0x07 /* Mask of phase bits */ 150 #define ESP_STAT_TDONE 0x08 /* Transfer Completed */ 151 #define ESP_STAT_TCNT 0x10 /* Transfer Counter Is Zero */ 152 #define ESP_STAT_PERR 0x20 /* Parity error */ 153 #define ESP_STAT_SPAM 0x40 /* Real bad error */ 154 /* This indicates the 'interrupt pending' condition on esp236, it is a reserved 155 * bit on other revs of the ESP. 156 */ 157 #define ESP_STAT_INTR 0x80 /* Interrupt */ 158 159 /* The status register can be masked with ESP_STAT_PMASK and compared 160 * with the following values to determine the current phase the ESP 161 * (at least thinks it) is in. For our purposes we also add our own 162 * software 'done' bit for our phase management engine. 163 */ 164 #define ESP_DOP (0) /* Data Out */ 165 #define ESP_DIP (ESP_STAT_PIO) /* Data In */ 166 #define ESP_CMDP (ESP_STAT_PCD) /* Command */ 167 #define ESP_STATP (ESP_STAT_PCD|ESP_STAT_PIO) /* Status */ 168 #define ESP_MOP (ESP_STAT_PMSG|ESP_STAT_PCD) /* Message Out */ 169 #define ESP_MIP (ESP_STAT_PMSG|ESP_STAT_PCD|ESP_STAT_PIO) /* Message In */ 170 171 /* HME only: status 2 register */ 172 #define ESP_STAT2_SCHBIT 0x01 /* Upper bits 3-7 of sstep enabled */ 173 #define ESP_STAT2_FFLAGS 0x02 /* The fifo flags are now latched */ 174 #define ESP_STAT2_XCNT 0x04 /* The transfer counter is latched */ 175 #define ESP_STAT2_CREGA 0x08 /* The command reg is active now */ 176 #define ESP_STAT2_WIDE 0x10 /* Interface on this adapter is wide */ 177 #define ESP_STAT2_F1BYTE 0x20 /* There is one byte at top of fifo */ 178 #define ESP_STAT2_FMSB 0x40 /* Next byte in fifo is most significant */ 179 #define ESP_STAT2_FEMPTY 0x80 /* FIFO is empty */ 180 181 /* ESP interrupt register read-only */ 182 #define ESP_INTR_S 0x01 /* Select w/o ATN */ 183 #define ESP_INTR_SATN 0x02 /* Select w/ATN */ 184 #define ESP_INTR_RSEL 0x04 /* Reselected */ 185 #define ESP_INTR_FDONE 0x08 /* Function done */ 186 #define ESP_INTR_BSERV 0x10 /* Bus service */ 187 #define ESP_INTR_DC 0x20 /* Disconnect */ 188 #define ESP_INTR_IC 0x40 /* Illegal command given */ 189 #define ESP_INTR_SR 0x80 /* SCSI bus reset detected */ 190 191 /* ESP sequence step register read-only */ 192 #define ESP_STEP_VBITS 0x07 /* Valid bits */ 193 #define ESP_STEP_ASEL 0x00 /* Selection&Arbitrate cmplt */ 194 #define ESP_STEP_SID 0x01 /* One msg byte sent */ 195 #define ESP_STEP_NCMD 0x02 /* Was not in command phase */ 196 #define ESP_STEP_PPC 0x03 /* Early phase chg caused cmnd 197 * bytes to be lost 198 */ 199 #define ESP_STEP_FINI4 0x04 /* Command was sent ok */ 200 201 /* Ho hum, some ESP's set the step register to this as well... */ 202 #define ESP_STEP_FINI5 0x05 203 #define ESP_STEP_FINI6 0x06 204 #define ESP_STEP_FINI7 0x07 205 206 /* ESP chip-test register read-write */ 207 #define ESP_TEST_TARG 0x01 /* Target test mode */ 208 #define ESP_TEST_INI 0x02 /* Initiator test mode */ 209 #define ESP_TEST_TS 0x04 /* Tristate test mode */ 210 211 /* ESP unique ID register read-only, found on fas236+fas100a only */ 212 #define ESP_UID_F100A 0x00 /* ESP FAS100A */ 213 #define ESP_UID_F236 0x02 /* ESP FAS236 */ 214 #define ESP_UID_REV 0x07 /* ESP revision */ 215 #define ESP_UID_FAM 0xf8 /* ESP family */ 216 217 /* ESP fifo flags register read-only */ 218 /* Note that the following implies a 16 byte FIFO on the ESP. */ 219 #define ESP_FF_FBYTES 0x1f /* Num bytes in FIFO */ 220 #define ESP_FF_ONOTZERO 0x20 /* offset ctr not zero (esp100) */ 221 #define ESP_FF_SSTEP 0xe0 /* Sequence step */ 222 223 /* ESP clock conversion factor register write-only */ 224 #define ESP_CCF_F0 0x00 /* 35.01MHz - 40MHz */ 225 #define ESP_CCF_NEVER 0x01 /* Set it to this and die */ 226 #define ESP_CCF_F2 0x02 /* 10MHz */ 227 #define ESP_CCF_F3 0x03 /* 10.01MHz - 15MHz */ 228 #define ESP_CCF_F4 0x04 /* 15.01MHz - 20MHz */ 229 #define ESP_CCF_F5 0x05 /* 20.01MHz - 25MHz */ 230 #define ESP_CCF_F6 0x06 /* 25.01MHz - 30MHz */ 231 #define ESP_CCF_F7 0x07 /* 30.01MHz - 35MHz */ 232 233 /* HME only... */ 234 #define ESP_BUSID_RESELID 0x10 235 #define ESP_BUSID_CTR32BIT 0x40 236 237 #define ESP_BUS_TIMEOUT 250 /* In milli-seconds */ 238 #define ESP_TIMEO_CONST 8192 239 #define ESP_NEG_DEFP(mhz, cfact) \ 240 ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact))) 241 #define ESP_HZ_TO_CYCLE(hertz) ((1000000000) / ((hertz) / 1000)) 242 #define ESP_TICK(ccf, cycle) ((7682 * (ccf) * (cycle) / 1000)) 243 244 /* For slow to medium speed input clock rates we shoot for 5mb/s, but for high 245 * input clock rates we try to do 10mb/s although I don't think a transfer can 246 * even run that fast with an ESP even with DMA2 scatter gather pipelining. 247 */ 248 #define SYNC_DEFP_SLOW 0x32 /* 5mb/s */ 249 #define SYNC_DEFP_FAST 0x19 /* 10mb/s */ 250 251 struct esp_cmd_priv { 252 int num_sg; 253 int cur_residue; 254 struct scatterlist *prv_sg; 255 struct scatterlist *cur_sg; 256 int tot_residue; 257 }; 258 #define ESP_CMD_PRIV(CMD) ((struct esp_cmd_priv *)(&(CMD)->SCp)) 259 260 enum esp_rev { 261 ESP100 = 0x00, /* NCR53C90 - very broken */ 262 ESP100A = 0x01, /* NCR53C90A */ 263 ESP236 = 0x02, 264 FAS236 = 0x03, 265 FAS100A = 0x04, 266 FAST = 0x05, 267 FASHME = 0x06, 268 PCSCSI = 0x07, /* AM53c974 */ 269 }; 270 271 struct esp_cmd_entry { 272 struct list_head list; 273 274 struct scsi_cmnd *cmd; 275 276 unsigned int saved_cur_residue; 277 struct scatterlist *saved_prv_sg; 278 struct scatterlist *saved_cur_sg; 279 unsigned int saved_tot_residue; 280 281 u8 flags; 282 #define ESP_CMD_FLAG_WRITE 0x01 /* DMA is a write */ 283 #define ESP_CMD_FLAG_AUTOSENSE 0x04 /* Doing automatic REQUEST_SENSE */ 284 #define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */ 285 286 u8 tag[2]; 287 u8 orig_tag[2]; 288 289 u8 status; 290 u8 message; 291 292 unsigned char *sense_ptr; 293 unsigned char *saved_sense_ptr; 294 dma_addr_t sense_dma; 295 296 struct completion *eh_done; 297 }; 298 299 #define ESP_DEFAULT_TAGS 16 300 301 #define ESP_MAX_TARGET 16 302 #define ESP_MAX_LUN 8 303 #define ESP_MAX_TAG 256 304 305 struct esp_lun_data { 306 struct esp_cmd_entry *non_tagged_cmd; 307 int num_tagged; 308 int hold; 309 struct esp_cmd_entry *tagged_cmds[ESP_MAX_TAG]; 310 }; 311 312 struct esp_target_data { 313 /* These are the ESP_STP, ESP_SOFF, and ESP_CFG3 register values which 314 * match the currently negotiated settings for this target. The SCSI 315 * protocol values are maintained in spi_{offset,period,wide}(starget). 316 */ 317 u8 esp_period; 318 u8 esp_offset; 319 u8 esp_config3; 320 321 u8 flags; 322 #define ESP_TGT_WIDE 0x01 323 #define ESP_TGT_DISCONNECT 0x02 324 #define ESP_TGT_NEGO_WIDE 0x04 325 #define ESP_TGT_NEGO_SYNC 0x08 326 #define ESP_TGT_CHECK_NEGO 0x40 327 #define ESP_TGT_BROKEN 0x80 328 329 /* When ESP_TGT_CHECK_NEGO is set, on the next scsi command to this 330 * device we will try to negotiate the following parameters. 331 */ 332 u8 nego_goal_period; 333 u8 nego_goal_offset; 334 u8 nego_goal_width; 335 u8 nego_goal_tags; 336 337 struct scsi_target *starget; 338 }; 339 340 struct esp_event_ent { 341 u8 type; 342 #define ESP_EVENT_TYPE_EVENT 0x01 343 #define ESP_EVENT_TYPE_CMD 0x02 344 u8 val; 345 346 u8 sreg; 347 u8 seqreg; 348 u8 sreg2; 349 u8 ireg; 350 u8 select_state; 351 u8 event; 352 u8 __pad; 353 }; 354 355 struct esp; 356 struct esp_driver_ops { 357 /* Read and write the ESP 8-bit registers. On some 358 * applications of the ESP chip the registers are at 4-byte 359 * instead of 1-byte intervals. 360 */ 361 void (*esp_write8)(struct esp *esp, u8 val, unsigned long reg); 362 u8 (*esp_read8)(struct esp *esp, unsigned long reg); 363 364 /* Return non-zero if there is an IRQ pending. Usually this 365 * status bit lives in the DMA controller sitting in front of 366 * the ESP. This has to be accurate or else the ESP interrupt 367 * handler will not run. 368 */ 369 int (*irq_pending)(struct esp *esp); 370 371 /* Return the maximum allowable size of a DMA transfer for a 372 * given buffer. 373 */ 374 u32 (*dma_length_limit)(struct esp *esp, u32 dma_addr, 375 u32 dma_len); 376 377 /* Reset the DMA engine entirely. On return, ESP interrupts 378 * should be enabled. Often the interrupt enabling is 379 * controlled in the DMA engine. 380 */ 381 void (*reset_dma)(struct esp *esp); 382 383 /* Drain any pending DMA in the DMA engine after a transfer. 384 * This is for writes to memory. 385 */ 386 void (*dma_drain)(struct esp *esp); 387 388 /* Invalidate the DMA engine after a DMA transfer. */ 389 void (*dma_invalidate)(struct esp *esp); 390 391 /* Setup an ESP command that will use a DMA transfer. 392 * The 'esp_count' specifies what transfer length should be 393 * programmed into the ESP transfer counter registers, whereas 394 * the 'dma_count' is the length that should be programmed into 395 * the DMA controller. Usually they are the same. If 'write' 396 * is non-zero, this transfer is a write into memory. 'cmd' 397 * holds the ESP command that should be issued by calling 398 * scsi_esp_cmd() at the appropriate time while programming 399 * the DMA hardware. 400 */ 401 void (*send_dma_cmd)(struct esp *esp, u32 dma_addr, u32 esp_count, 402 u32 dma_count, int write, u8 cmd); 403 404 /* Return non-zero if the DMA engine is reporting an error 405 * currently. 406 */ 407 int (*dma_error)(struct esp *esp); 408 }; 409 410 #define ESP_MAX_MSG_SZ 8 411 #define ESP_EVENT_LOG_SZ 32 412 413 #define ESP_QUICKIRQ_LIMIT 100 414 #define ESP_RESELECT_TAG_LIMIT 2500 415 416 struct esp { 417 void __iomem *regs; 418 void __iomem *dma_regs; 419 420 const struct esp_driver_ops *ops; 421 422 struct Scsi_Host *host; 423 struct device *dev; 424 425 struct esp_cmd_entry *active_cmd; 426 427 struct list_head queued_cmds; 428 struct list_head active_cmds; 429 430 u8 *command_block; 431 dma_addr_t command_block_dma; 432 433 unsigned int data_dma_len; 434 435 /* The following are used to determine the cause of an IRQ. Upon every 436 * IRQ entry we synchronize these with the hardware registers. 437 */ 438 u8 sreg; 439 u8 seqreg; 440 u8 sreg2; 441 u8 ireg; 442 443 u32 prev_hme_dmacsr; 444 u8 prev_soff; 445 u8 prev_stp; 446 u8 prev_cfg3; 447 u8 num_tags; 448 449 struct list_head esp_cmd_pool; 450 451 struct esp_target_data target[ESP_MAX_TARGET]; 452 453 int fifo_cnt; 454 u8 fifo[16]; 455 456 struct esp_event_ent esp_event_log[ESP_EVENT_LOG_SZ]; 457 int esp_event_cur; 458 459 u8 msg_out[ESP_MAX_MSG_SZ]; 460 int msg_out_len; 461 462 u8 msg_in[ESP_MAX_MSG_SZ]; 463 int msg_in_len; 464 465 u8 bursts; 466 u8 config1; 467 u8 config2; 468 u8 config4; 469 470 u8 scsi_id; 471 u32 scsi_id_mask; 472 473 enum esp_rev rev; 474 475 u32 flags; 476 #define ESP_FLAG_DIFFERENTIAL 0x00000001 477 #define ESP_FLAG_RESETTING 0x00000002 478 #define ESP_FLAG_WIDE_CAPABLE 0x00000008 479 #define ESP_FLAG_QUICKIRQ_CHECK 0x00000010 480 #define ESP_FLAG_DISABLE_SYNC 0x00000020 481 #define ESP_FLAG_USE_FIFO 0x00000040 482 #define ESP_FLAG_NO_DMA_MAP 0x00000080 483 484 u8 select_state; 485 #define ESP_SELECT_NONE 0x00 /* Not selecting */ 486 #define ESP_SELECT_BASIC 0x01 /* Select w/o MSGOUT phase */ 487 #define ESP_SELECT_MSGOUT 0x02 /* Select with MSGOUT */ 488 489 /* When we are not selecting, we are expecting an event. */ 490 u8 event; 491 #define ESP_EVENT_NONE 0x00 492 #define ESP_EVENT_CMD_START 0x01 493 #define ESP_EVENT_CMD_DONE 0x02 494 #define ESP_EVENT_DATA_IN 0x03 495 #define ESP_EVENT_DATA_OUT 0x04 496 #define ESP_EVENT_DATA_DONE 0x05 497 #define ESP_EVENT_MSGIN 0x06 498 #define ESP_EVENT_MSGIN_MORE 0x07 499 #define ESP_EVENT_MSGIN_DONE 0x08 500 #define ESP_EVENT_MSGOUT 0x09 501 #define ESP_EVENT_MSGOUT_DONE 0x0a 502 #define ESP_EVENT_STATUS 0x0b 503 #define ESP_EVENT_FREE_BUS 0x0c 504 #define ESP_EVENT_CHECK_PHASE 0x0d 505 #define ESP_EVENT_RESET 0x10 506 507 /* Probed in esp_get_clock_params() */ 508 u32 cfact; 509 u32 cfreq; 510 u32 ccycle; 511 u32 ctick; 512 u32 neg_defp; 513 u32 sync_defp; 514 515 /* Computed in esp_reset_esp() */ 516 u32 max_period; 517 u32 min_period; 518 u32 radelay; 519 520 /* ESP_CMD_SELAS command state */ 521 u8 *cmd_bytes_ptr; 522 int cmd_bytes_left; 523 524 struct completion *eh_reset; 525 526 void *dma; 527 int dmarev; 528 529 /* These are used by esp_send_pio_cmd() */ 530 u8 __iomem *fifo_reg; 531 int send_cmd_error; 532 u32 send_cmd_residual; 533 }; 534 535 /* A front-end driver for the ESP chip should do the following in 536 * it's device probe routine: 537 * 1) Allocate the host and private area using scsi_host_alloc() 538 * with size 'sizeof(struct esp)'. The first argument to 539 * scsi_host_alloc() should be &scsi_esp_template. 540 * 2) Set host->max_id as appropriate. 541 * 3) Set esp->host to the scsi_host itself, and esp->dev 542 * to the device object pointer. 543 * 4) Hook up esp->ops to the front-end implementation. 544 * 5) If the ESP chip supports wide transfers, set ESP_FLAG_WIDE_CAPABLE 545 * in esp->flags. 546 * 6) Map the DMA and ESP chip registers. 547 * 7) DMA map the ESP command block, store the DMA address 548 * in esp->command_block_dma. 549 * 8) Register the scsi_esp_intr() interrupt handler. 550 * 9) Probe for and provide the following chip properties: 551 * esp->scsi_id (assign to esp->host->this_id too) 552 * esp->scsi_id_mask 553 * If ESP bus is differential, set ESP_FLAG_DIFFERENTIAL 554 * esp->cfreq 555 * DMA burst bit mask in esp->bursts, if necessary 556 * 10) Perform any actions necessary before the ESP device can 557 * be programmed for the first time. On some configs, for 558 * example, the DMA engine has to be reset before ESP can 559 * be programmed. 560 * 11) If necessary, call dev_set_drvdata() as needed. 561 * 12) Call scsi_esp_register() with prepared 'esp' structure. 562 * 13) Check scsi_esp_register() return value, release all resources 563 * if an error was returned. 564 */ 565 extern struct scsi_host_template scsi_esp_template; 566 extern int scsi_esp_register(struct esp *); 567 568 extern void scsi_esp_unregister(struct esp *); 569 extern irqreturn_t scsi_esp_intr(int, void *); 570 extern void scsi_esp_cmd(struct esp *, u8); 571 572 extern void esp_send_pio_cmd(struct esp *esp, u32 dma_addr, u32 esp_count, 573 u32 dma_count, int write, u8 cmd); 574 575 #endif /* !(_ESP_SCSI_H) */ 576