projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| a87bf293 | 1 | /* esp_scsi.h: Defines and structures for the ESP driver. |
| cd9ad58d DM |
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 */ | |
| eeea2f9c | 28 | #define ESP_CFG4 0x0dUL /* rw Fourth cfg register 0x34 */ |
| cd9ad58d DM |
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 | ||
| eeea2f9c HR |
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 | ||
| cd9ad58d DM |
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 | ||
| 96d32215 | 236 | #define ESP_BUS_TIMEOUT 250 /* In milli-seconds */ |
| cd9ad58d DM |
237 | #define ESP_TIMEO_CONST 8192 |
| 238 | #define ESP_NEG_DEFP(mhz, cfact) \ | |
| 239 | ((ESP_BUS_TIMEOUT * ((mhz) / 1000)) / (8192 * (cfact))) | |
| 6fe07aaf | 240 | #define ESP_HZ_TO_CYCLE(hertz) ((1000000000) / ((hertz) / 1000)) |
| cd9ad58d DM |
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 | ||
| 582fb6c0 | 256 | int cur_residue; |
| cd9ad58d | 257 | struct scatterlist *cur_sg; |
| 582fb6c0 | 258 | int tot_residue; |
| cd9ad58d DM |
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, | |
| eeea2f9c | 270 | PCSCSI = 0x07, /* AM53c974 */ |
| cd9ad58d DM |
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 */ | |
| 6df388f2 | 286 | #define ESP_CMD_FLAG_RESIDUAL 0x08 /* AM53c974 BLAST residual */ |
| cd9ad58d DM |
287 | |
| 288 | u8 tag[2]; | |
| 21af8107 | 289 | u8 orig_tag[2]; |
| cd9ad58d DM |
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 | ||
| cd9ad58d DM |
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 | ||
| 6fe07aaf FT |
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 | ||
| cd9ad58d DM |
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; | |
| 3707a186 | 462 | u8 num_tags; |
| cd9ad58d DM |
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; | |
| eeea2f9c | 483 | u8 config4; |
| cd9ad58d DM |
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 | |
| 6fe07aaf | 496 | #define ESP_FLAG_DISABLE_SYNC 0x00000020 |
| 3170866f | 497 | #define ESP_FLAG_USE_FIFO 0x00000040 |
| cd9ad58d DM |
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 | ||
| 334ae614 DM |
541 | void *dma; |
| 542 | int dmarev; | |
| cd9ad58d DM |
543 | }; |
| 544 | ||
| cd9ad58d DM |
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) */ |