1 /* 2 * NCR 5380 defines 3 * 4 * Copyright 1993, Drew Eckhardt 5 * Visionary Computing 6 * (Unix consulting and custom programming) 7 * drew@colorado.edu 8 * +1 (303) 666-5836 9 * 10 * For more information, please consult 11 * 12 * NCR 5380 Family 13 * SCSI Protocol Controller 14 * Databook 15 * NCR Microelectronics 16 * 1635 Aeroplaza Drive 17 * Colorado Springs, CO 80916 18 * 1+ (719) 578-3400 19 * 1+ (800) 334-5454 20 */ 21 22 #ifndef NCR5380_H 23 #define NCR5380_H 24 25 #include <linux/interrupt.h> 26 #include <scsi/scsi_eh.h> 27 28 #define NDEBUG_ARBITRATION 0x1 29 #define NDEBUG_AUTOSENSE 0x2 30 #define NDEBUG_DMA 0x4 31 #define NDEBUG_HANDSHAKE 0x8 32 #define NDEBUG_INFORMATION 0x10 33 #define NDEBUG_INIT 0x20 34 #define NDEBUG_INTR 0x40 35 #define NDEBUG_LINKED 0x80 36 #define NDEBUG_MAIN 0x100 37 #define NDEBUG_NO_DATAOUT 0x200 38 #define NDEBUG_NO_WRITE 0x400 39 #define NDEBUG_PIO 0x800 40 #define NDEBUG_PSEUDO_DMA 0x1000 41 #define NDEBUG_QUEUES 0x2000 42 #define NDEBUG_RESELECTION 0x4000 43 #define NDEBUG_SELECTION 0x8000 44 #define NDEBUG_USLEEP 0x10000 45 #define NDEBUG_LAST_BYTE_SENT 0x20000 46 #define NDEBUG_RESTART_SELECT 0x40000 47 #define NDEBUG_EXTENDED 0x80000 48 #define NDEBUG_C400_PREAD 0x100000 49 #define NDEBUG_C400_PWRITE 0x200000 50 #define NDEBUG_LISTS 0x400000 51 #define NDEBUG_ABORT 0x800000 52 #define NDEBUG_TAGS 0x1000000 53 #define NDEBUG_MERGING 0x2000000 54 55 #define NDEBUG_ANY 0xFFFFFFFFUL 56 57 /* 58 * The contents of the OUTPUT DATA register are asserted on the bus when 59 * either arbitration is occurring or the phase-indicating signals ( 60 * IO, CD, MSG) in the TARGET COMMAND register and the ASSERT DATA 61 * bit in the INITIATOR COMMAND register is set. 62 */ 63 64 #define OUTPUT_DATA_REG 0 /* wo DATA lines on SCSI bus */ 65 #define CURRENT_SCSI_DATA_REG 0 /* ro same */ 66 67 #define INITIATOR_COMMAND_REG 1 /* rw */ 68 #define ICR_ASSERT_RST 0x80 /* rw Set to assert RST */ 69 #define ICR_ARBITRATION_PROGRESS 0x40 /* ro Indicates arbitration complete */ 70 #define ICR_TRI_STATE 0x40 /* wo Set to tri-state drivers */ 71 #define ICR_ARBITRATION_LOST 0x20 /* ro Indicates arbitration lost */ 72 #define ICR_DIFF_ENABLE 0x20 /* wo Set to enable diff. drivers */ 73 #define ICR_ASSERT_ACK 0x10 /* rw ini Set to assert ACK */ 74 #define ICR_ASSERT_BSY 0x08 /* rw Set to assert BSY */ 75 #define ICR_ASSERT_SEL 0x04 /* rw Set to assert SEL */ 76 #define ICR_ASSERT_ATN 0x02 /* rw Set to assert ATN */ 77 #define ICR_ASSERT_DATA 0x01 /* rw SCSI_DATA_REG is asserted */ 78 79 #ifdef DIFFERENTIAL 80 #define ICR_BASE ICR_DIFF_ENABLE 81 #else 82 #define ICR_BASE 0 83 #endif 84 85 #define MODE_REG 2 86 /* 87 * Note : BLOCK_DMA code will keep DRQ asserted for the duration of the 88 * transfer, causing the chip to hog the bus. You probably don't want 89 * this. 90 */ 91 #define MR_BLOCK_DMA_MODE 0x80 /* rw block mode DMA */ 92 #define MR_TARGET 0x40 /* rw target mode */ 93 #define MR_ENABLE_PAR_CHECK 0x20 /* rw enable parity checking */ 94 #define MR_ENABLE_PAR_INTR 0x10 /* rw enable bad parity interrupt */ 95 #define MR_ENABLE_EOP_INTR 0x08 /* rw enable eop interrupt */ 96 #define MR_MONITOR_BSY 0x04 /* rw enable int on unexpected bsy fail */ 97 #define MR_DMA_MODE 0x02 /* rw DMA / pseudo DMA mode */ 98 #define MR_ARBITRATE 0x01 /* rw start arbitration */ 99 100 #ifdef PARITY 101 #define MR_BASE MR_ENABLE_PAR_CHECK 102 #else 103 #define MR_BASE 0 104 #endif 105 106 #define TARGET_COMMAND_REG 3 107 #define TCR_LAST_BYTE_SENT 0x80 /* ro DMA done */ 108 #define TCR_ASSERT_REQ 0x08 /* tgt rw assert REQ */ 109 #define TCR_ASSERT_MSG 0x04 /* tgt rw assert MSG */ 110 #define TCR_ASSERT_CD 0x02 /* tgt rw assert CD */ 111 #define TCR_ASSERT_IO 0x01 /* tgt rw assert IO */ 112 113 #define STATUS_REG 4 /* ro */ 114 /* 115 * Note : a set bit indicates an active signal, driven by us or another 116 * device. 117 */ 118 #define SR_RST 0x80 119 #define SR_BSY 0x40 120 #define SR_REQ 0x20 121 #define SR_MSG 0x10 122 #define SR_CD 0x08 123 #define SR_IO 0x04 124 #define SR_SEL 0x02 125 #define SR_DBP 0x01 126 127 /* 128 * Setting a bit in this register will cause an interrupt to be generated when 129 * BSY is false and SEL true and this bit is asserted on the bus. 130 */ 131 #define SELECT_ENABLE_REG 4 /* wo */ 132 133 #define BUS_AND_STATUS_REG 5 /* ro */ 134 #define BASR_END_DMA_TRANSFER 0x80 /* ro set on end of transfer */ 135 #define BASR_DRQ 0x40 /* ro mirror of DRQ pin */ 136 #define BASR_PARITY_ERROR 0x20 /* ro parity error detected */ 137 #define BASR_IRQ 0x10 /* ro mirror of IRQ pin */ 138 #define BASR_PHASE_MATCH 0x08 /* ro Set when MSG CD IO match TCR */ 139 #define BASR_BUSY_ERROR 0x04 /* ro Unexpected change to inactive state */ 140 #define BASR_ATN 0x02 /* ro BUS status */ 141 #define BASR_ACK 0x01 /* ro BUS status */ 142 143 /* Write any value to this register to start a DMA send */ 144 #define START_DMA_SEND_REG 5 /* wo */ 145 146 /* 147 * Used in DMA transfer mode, data is latched from the SCSI bus on 148 * the falling edge of REQ (ini) or ACK (tgt) 149 */ 150 #define INPUT_DATA_REG 6 /* ro */ 151 152 /* Write any value to this register to start a DMA receive */ 153 #define START_DMA_TARGET_RECEIVE_REG 6 /* wo */ 154 155 /* Read this register to clear interrupt conditions */ 156 #define RESET_PARITY_INTERRUPT_REG 7 /* ro */ 157 158 /* Write any value to this register to start an ini mode DMA receive */ 159 #define START_DMA_INITIATOR_RECEIVE_REG 7 /* wo */ 160 161 #define C400_CONTROL_STATUS_REG NCR53C400_register_offset-8 /* rw */ 162 163 #define CSR_RESET 0x80 /* wo Resets 53c400 */ 164 #define CSR_53C80_REG 0x80 /* ro 5380 registers busy */ 165 #define CSR_TRANS_DIR 0x40 /* rw Data transfer direction */ 166 #define CSR_SCSI_BUFF_INTR 0x20 /* rw Enable int on transfer ready */ 167 #define CSR_53C80_INTR 0x10 /* rw Enable 53c80 interrupts */ 168 #define CSR_SHARED_INTR 0x08 /* rw Interrupt sharing */ 169 #define CSR_HOST_BUF_NOT_RDY 0x04 /* ro Is Host buffer ready */ 170 #define CSR_SCSI_BUF_RDY 0x02 /* ro SCSI buffer read */ 171 #define CSR_GATED_53C80_IRQ 0x01 /* ro Last block xferred */ 172 173 #if 0 174 #define CSR_BASE CSR_SCSI_BUFF_INTR | CSR_53C80_INTR 175 #else 176 #define CSR_BASE CSR_53C80_INTR 177 #endif 178 179 /* Number of 128-byte blocks to be transferred */ 180 #define C400_BLOCK_COUNTER_REG NCR53C400_register_offset-7 /* rw */ 181 182 /* Resume transfer after disconnect */ 183 #define C400_RESUME_TRANSFER_REG NCR53C400_register_offset-6 /* wo */ 184 185 /* Access to host buffer stack */ 186 #define C400_HOST_BUFFER NCR53C400_register_offset-4 /* rw */ 187 188 189 /* Note : PHASE_* macros are based on the values of the STATUS register */ 190 #define PHASE_MASK (SR_MSG | SR_CD | SR_IO) 191 192 #define PHASE_DATAOUT 0 193 #define PHASE_DATAIN SR_IO 194 #define PHASE_CMDOUT SR_CD 195 #define PHASE_STATIN (SR_CD | SR_IO) 196 #define PHASE_MSGOUT (SR_MSG | SR_CD) 197 #define PHASE_MSGIN (SR_MSG | SR_CD | SR_IO) 198 #define PHASE_UNKNOWN 0xff 199 200 /* 201 * Convert status register phase to something we can use to set phase in 202 * the target register so we can get phase mismatch interrupts on DMA 203 * transfers. 204 */ 205 206 #define PHASE_SR_TO_TCR(phase) ((phase) >> 2) 207 208 /* 209 * The internal should_disconnect() function returns these based on the 210 * expected length of a disconnect if a device supports disconnect/ 211 * reconnect. 212 */ 213 214 #define DISCONNECT_NONE 0 215 #define DISCONNECT_TIME_TO_DATA 1 216 #define DISCONNECT_LONG 2 217 218 /* 219 * "Special" value for the (unsigned char) command tag, to indicate 220 * I_T_L nexus instead of I_T_L_Q. 221 */ 222 223 #define TAG_NONE 0xff 224 225 /* 226 * These are "special" values for the irq and dma_channel fields of the 227 * Scsi_Host structure 228 */ 229 230 #define DMA_NONE 255 231 #define IRQ_AUTO 254 232 #define DMA_AUTO 254 233 #define PORT_AUTO 0xffff /* autoprobe io port for 53c400a */ 234 235 #ifndef NO_IRQ 236 #define NO_IRQ 0 237 #endif 238 239 #define FLAG_HAS_LAST_BYTE_SENT 1 /* NCR53c81 or better */ 240 #define FLAG_CHECK_LAST_BYTE_SENT 2 /* Only test once */ 241 #define FLAG_NCR53C400 4 /* NCR53c400 */ 242 #define FLAG_NO_PSEUDO_DMA 8 /* Inhibit DMA */ 243 #define FLAG_DTC3181E 16 /* DTC3181E */ 244 #define FLAG_LATE_DMA_SETUP 32 /* Setup NCR before DMA H/W */ 245 #define FLAG_TAGGED_QUEUING 64 /* as X3T9.2 spelled it */ 246 247 #ifndef ASM 248 249 #ifdef SUPPORT_TAGS 250 struct tag_alloc { 251 DECLARE_BITMAP(allocated, MAX_TAGS); 252 int nr_allocated; 253 int queue_size; 254 }; 255 #endif 256 257 struct NCR5380_hostdata { 258 NCR5380_implementation_fields; /* implementation specific */ 259 struct Scsi_Host *host; /* Host backpointer */ 260 unsigned char id_mask, id_higher_mask; /* 1 << id, all bits greater */ 261 unsigned char targets_present; /* targets we have connected 262 to, so we can call a select 263 failure a retryable condition */ 264 volatile unsigned char busy[8]; /* index = target, bit = lun */ 265 #if defined(REAL_DMA) || defined(REAL_DMA_POLL) 266 volatile int dma_len; /* requested length of DMA */ 267 #endif 268 volatile unsigned char last_message; /* last message OUT */ 269 volatile struct scsi_cmnd *connected; /* currently connected command */ 270 volatile struct scsi_cmnd *issue_queue; /* waiting to be issued */ 271 volatile struct scsi_cmnd *disconnected_queue; /* waiting for reconnect */ 272 volatile int restart_select; /* we have disconnected, 273 used to restart 274 NCR5380_select() */ 275 volatile unsigned aborted:1; /* flag, says aborted */ 276 int flags; 277 unsigned long time_expires; /* in jiffies, set prior to sleeping */ 278 int select_time; /* timer in select for target response */ 279 volatile struct scsi_cmnd *selecting; 280 struct delayed_work coroutine; /* our co-routine */ 281 struct scsi_eh_save ses; 282 char info[256]; 283 int read_overruns; /* number of bytes to cut from a 284 * transfer to handle chip overruns */ 285 int retain_dma_intr; 286 struct work_struct main_task; 287 volatile int main_running; 288 #ifdef SUPPORT_TAGS 289 struct tag_alloc TagAlloc[8][8]; /* 8 targets and 8 LUNs */ 290 #endif 291 #ifdef PSEUDO_DMA 292 unsigned spin_max_r; 293 unsigned spin_max_w; 294 #endif 295 }; 296 297 #ifdef __KERNEL__ 298 299 #ifndef NDEBUG 300 #define NDEBUG (0) 301 #endif 302 303 #define dprintk(flg, fmt, ...) \ 304 do { if ((NDEBUG) & (flg)) \ 305 printk(KERN_DEBUG fmt, ## __VA_ARGS__); } while (0) 306 307 #if NDEBUG 308 #define NCR5380_dprint(flg, arg) \ 309 do { if ((NDEBUG) & (flg)) NCR5380_print(arg); } while (0) 310 #define NCR5380_dprint_phase(flg, arg) \ 311 do { if ((NDEBUG) & (flg)) NCR5380_print_phase(arg); } while (0) 312 static void NCR5380_print_phase(struct Scsi_Host *instance); 313 static void NCR5380_print(struct Scsi_Host *instance); 314 #else 315 #define NCR5380_dprint(flg, arg) do {} while (0) 316 #define NCR5380_dprint_phase(flg, arg) do {} while (0) 317 #endif 318 319 #if defined(AUTOPROBE_IRQ) 320 static int NCR5380_probe_irq(struct Scsi_Host *instance, int possible); 321 #endif 322 static int NCR5380_init(struct Scsi_Host *instance, int flags); 323 static void NCR5380_exit(struct Scsi_Host *instance); 324 static void NCR5380_information_transfer(struct Scsi_Host *instance); 325 #ifndef DONT_USE_INTR 326 static irqreturn_t NCR5380_intr(int irq, void *dev_id); 327 #endif 328 static void NCR5380_main(struct work_struct *work); 329 static const char *NCR5380_info(struct Scsi_Host *instance); 330 static void NCR5380_reselect(struct Scsi_Host *instance); 331 static int NCR5380_select(struct Scsi_Host *instance, struct scsi_cmnd *cmd); 332 #if defined(PSEUDO_DMA) || defined(REAL_DMA) || defined(REAL_DMA_POLL) 333 static int NCR5380_transfer_dma(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); 334 #endif 335 static int NCR5380_transfer_pio(struct Scsi_Host *instance, unsigned char *phase, int *count, unsigned char **data); 336 337 #if (defined(REAL_DMA) || defined(REAL_DMA_POLL)) 338 339 #if defined(i386) || defined(__alpha__) 340 341 /** 342 * NCR5380_pc_dma_setup - setup ISA DMA 343 * @instance: adapter to set up 344 * @ptr: block to transfer (virtual address) 345 * @count: number of bytes to transfer 346 * @mode: DMA controller mode to use 347 * 348 * Program the DMA controller ready to perform an ISA DMA transfer 349 * on this chip. 350 * 351 * Locks: takes and releases the ISA DMA lock. 352 */ 353 354 static __inline__ int NCR5380_pc_dma_setup(struct Scsi_Host *instance, unsigned char *ptr, unsigned int count, unsigned char mode) 355 { 356 unsigned limit; 357 unsigned long bus_addr = virt_to_bus(ptr); 358 unsigned long flags; 359 360 if (instance->dma_channel <= 3) { 361 if (count > 65536) 362 count = 65536; 363 limit = 65536 - (bus_addr & 0xFFFF); 364 } else { 365 if (count > 65536 * 2) 366 count = 65536 * 2; 367 limit = 65536 * 2 - (bus_addr & 0x1FFFF); 368 } 369 370 if (count > limit) 371 count = limit; 372 373 if ((count & 1) || (bus_addr & 1)) 374 panic("scsi%d : attempted unaligned DMA transfer\n", instance->host_no); 375 376 flags=claim_dma_lock(); 377 disable_dma(instance->dma_channel); 378 clear_dma_ff(instance->dma_channel); 379 set_dma_addr(instance->dma_channel, bus_addr); 380 set_dma_count(instance->dma_channel, count); 381 set_dma_mode(instance->dma_channel, mode); 382 enable_dma(instance->dma_channel); 383 release_dma_lock(flags); 384 385 return count; 386 } 387 388 /** 389 * NCR5380_pc_dma_write_setup - setup ISA DMA write 390 * @instance: adapter to set up 391 * @ptr: block to transfer (virtual address) 392 * @count: number of bytes to transfer 393 * 394 * Program the DMA controller ready to perform an ISA DMA write to the 395 * SCSI controller. 396 * 397 * Locks: called routines take and release the ISA DMA lock. 398 */ 399 400 static __inline__ int NCR5380_pc_dma_write_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count) 401 { 402 return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_WRITE); 403 } 404 405 /** 406 * NCR5380_pc_dma_read_setup - setup ISA DMA read 407 * @instance: adapter to set up 408 * @ptr: block to transfer (virtual address) 409 * @count: number of bytes to transfer 410 * 411 * Program the DMA controller ready to perform an ISA DMA read from the 412 * SCSI controller. 413 * 414 * Locks: called routines take and release the ISA DMA lock. 415 */ 416 417 static __inline__ int NCR5380_pc_dma_read_setup(struct Scsi_Host *instance, unsigned char *src, unsigned int count) 418 { 419 return NCR5380_pc_dma_setup(instance, src, count, DMA_MODE_READ); 420 } 421 422 /** 423 * NCR5380_pc_dma_residual - return bytes left 424 * @instance: adapter 425 * 426 * Reports the number of bytes left over after the DMA was terminated. 427 * 428 * Locks: takes and releases the ISA DMA lock. 429 */ 430 431 static __inline__ int NCR5380_pc_dma_residual(struct Scsi_Host *instance) 432 { 433 unsigned long flags; 434 int tmp; 435 436 flags = claim_dma_lock(); 437 clear_dma_ff(instance->dma_channel); 438 tmp = get_dma_residue(instance->dma_channel); 439 release_dma_lock(flags); 440 441 return tmp; 442 } 443 #endif /* defined(i386) || defined(__alpha__) */ 444 #endif /* defined(REAL_DMA) */ 445 #endif /* __KERNEL__ */ 446 #endif /* ndef ASM */ 447 #endif /* NCR5380_H */ 448