1 /* 2 * Generic Macintosh NCR5380 driver 3 * 4 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov> 5 * 6 * derived in part from: 7 */ 8 /* 9 * Generic Generic NCR5380 driver 10 * 11 * Copyright 1995, Russell King 12 */ 13 14 #include <linux/types.h> 15 #include <linux/module.h> 16 #include <linux/ioport.h> 17 #include <linux/init.h> 18 #include <linux/blkdev.h> 19 #include <linux/interrupt.h> 20 #include <linux/platform_device.h> 21 22 #include <asm/hwtest.h> 23 #include <asm/io.h> 24 #include <asm/macints.h> 25 #include <asm/setup.h> 26 27 #include <scsi/scsi_host.h> 28 29 /* Definitions for the core NCR5380 driver. */ 30 31 #define NCR5380_implementation_fields int pdma_residual 32 33 #define NCR5380_read(reg) macscsi_read(instance, reg) 34 #define NCR5380_write(reg, value) macscsi_write(instance, reg, value) 35 36 #define NCR5380_dma_xfer_len(instance, cmd, phase) \ 37 macscsi_dma_xfer_len(instance, cmd) 38 #define NCR5380_dma_recv_setup macscsi_pread 39 #define NCR5380_dma_send_setup macscsi_pwrite 40 #define NCR5380_dma_residual(instance) (hostdata->pdma_residual) 41 42 #define NCR5380_intr macscsi_intr 43 #define NCR5380_queue_command macscsi_queue_command 44 #define NCR5380_abort macscsi_abort 45 #define NCR5380_bus_reset macscsi_bus_reset 46 #define NCR5380_info macscsi_info 47 48 #include "NCR5380.h" 49 50 static int setup_can_queue = -1; 51 module_param(setup_can_queue, int, 0); 52 static int setup_cmd_per_lun = -1; 53 module_param(setup_cmd_per_lun, int, 0); 54 static int setup_sg_tablesize = -1; 55 module_param(setup_sg_tablesize, int, 0); 56 static int setup_use_pdma = -1; 57 module_param(setup_use_pdma, int, 0); 58 static int setup_hostid = -1; 59 module_param(setup_hostid, int, 0); 60 static int setup_toshiba_delay = -1; 61 module_param(setup_toshiba_delay, int, 0); 62 63 /* 64 * NCR 5380 register access functions 65 */ 66 67 static inline char macscsi_read(struct Scsi_Host *instance, int reg) 68 { 69 struct NCR5380_hostdata *hostdata = shost_priv(instance); 70 71 return in_8(hostdata->io + (reg << 4)); 72 } 73 74 static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value) 75 { 76 struct NCR5380_hostdata *hostdata = shost_priv(instance); 77 78 out_8(hostdata->io + (reg << 4), value); 79 } 80 81 #ifndef MODULE 82 static int __init mac_scsi_setup(char *str) 83 { 84 int ints[8]; 85 86 (void)get_options(str, ARRAY_SIZE(ints), ints); 87 88 if (ints[0] < 1) { 89 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n"); 90 return 0; 91 } 92 if (ints[0] >= 1) 93 setup_can_queue = ints[1]; 94 if (ints[0] >= 2) 95 setup_cmd_per_lun = ints[2]; 96 if (ints[0] >= 3) 97 setup_sg_tablesize = ints[3]; 98 if (ints[0] >= 4) 99 setup_hostid = ints[4]; 100 /* ints[5] (use_tagged_queuing) is ignored */ 101 if (ints[0] >= 6) 102 setup_use_pdma = ints[6]; 103 if (ints[0] >= 7) 104 setup_toshiba_delay = ints[7]; 105 return 1; 106 } 107 108 __setup("mac5380=", mac_scsi_setup); 109 #endif /* !MODULE */ 110 111 /* Pseudo DMA asm originally by Ove Edlund */ 112 113 #define CP_IO_TO_MEM(s,d,n) \ 114 __asm__ __volatile__ \ 115 (" cmp.w #4,%2\n" \ 116 " bls 8f\n" \ 117 " move.w %1,%%d0\n" \ 118 " neg.b %%d0\n" \ 119 " and.w #3,%%d0\n" \ 120 " sub.w %%d0,%2\n" \ 121 " bra 2f\n" \ 122 " 1: move.b (%0),(%1)+\n" \ 123 " 2: dbf %%d0,1b\n" \ 124 " move.w %2,%%d0\n" \ 125 " lsr.w #5,%%d0\n" \ 126 " bra 4f\n" \ 127 " 3: move.l (%0),(%1)+\n" \ 128 "31: move.l (%0),(%1)+\n" \ 129 "32: move.l (%0),(%1)+\n" \ 130 "33: move.l (%0),(%1)+\n" \ 131 "34: move.l (%0),(%1)+\n" \ 132 "35: move.l (%0),(%1)+\n" \ 133 "36: move.l (%0),(%1)+\n" \ 134 "37: move.l (%0),(%1)+\n" \ 135 " 4: dbf %%d0,3b\n" \ 136 " move.w %2,%%d0\n" \ 137 " lsr.w #2,%%d0\n" \ 138 " and.w #7,%%d0\n" \ 139 " bra 6f\n" \ 140 " 5: move.l (%0),(%1)+\n" \ 141 " 6: dbf %%d0,5b\n" \ 142 " and.w #3,%2\n" \ 143 " bra 8f\n" \ 144 " 7: move.b (%0),(%1)+\n" \ 145 " 8: dbf %2,7b\n" \ 146 " moveq.l #0, %2\n" \ 147 " 9: \n" \ 148 ".section .fixup,\"ax\"\n" \ 149 " .even\n" \ 150 "91: moveq.l #1, %2\n" \ 151 " jra 9b\n" \ 152 "94: moveq.l #4, %2\n" \ 153 " jra 9b\n" \ 154 ".previous\n" \ 155 ".section __ex_table,\"a\"\n" \ 156 " .align 4\n" \ 157 " .long 1b,91b\n" \ 158 " .long 3b,94b\n" \ 159 " .long 31b,94b\n" \ 160 " .long 32b,94b\n" \ 161 " .long 33b,94b\n" \ 162 " .long 34b,94b\n" \ 163 " .long 35b,94b\n" \ 164 " .long 36b,94b\n" \ 165 " .long 37b,94b\n" \ 166 " .long 5b,94b\n" \ 167 " .long 7b,91b\n" \ 168 ".previous" \ 169 : "=a"(s), "=a"(d), "=d"(n) \ 170 : "0"(s), "1"(d), "2"(n) \ 171 : "d0") 172 173 static int macscsi_pread(struct Scsi_Host *instance, 174 unsigned char *dst, int len) 175 { 176 struct NCR5380_hostdata *hostdata = shost_priv(instance); 177 unsigned char *s = hostdata->pdma_io + (INPUT_DATA_REG << 4); 178 unsigned char *d = dst; 179 int n = len; 180 int transferred; 181 182 while (!NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, 183 BASR_DRQ | BASR_PHASE_MATCH, 184 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 185 CP_IO_TO_MEM(s, d, n); 186 187 transferred = d - dst - n; 188 hostdata->pdma_residual = len - transferred; 189 190 /* No bus error. */ 191 if (n == 0) 192 return 0; 193 194 /* Target changed phase early? */ 195 if (NCR5380_poll_politely2(instance, STATUS_REG, SR_REQ, SR_REQ, 196 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0) 197 scmd_printk(KERN_ERR, hostdata->connected, 198 "%s: !REQ and !ACK\n", __func__); 199 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 200 return 0; 201 202 dsprintk(NDEBUG_PSEUDO_DMA, instance, 203 "%s: bus error (%d/%d)\n", __func__, transferred, len); 204 NCR5380_dprint(NDEBUG_PSEUDO_DMA, instance); 205 d = dst + transferred; 206 n = len - transferred; 207 } 208 209 scmd_printk(KERN_ERR, hostdata->connected, 210 "%s: phase mismatch or !DRQ\n", __func__); 211 NCR5380_dprint(NDEBUG_PSEUDO_DMA, instance); 212 return -1; 213 } 214 215 216 #define CP_MEM_TO_IO(s,d,n) \ 217 __asm__ __volatile__ \ 218 (" cmp.w #4,%2\n" \ 219 " bls 8f\n" \ 220 " move.w %0,%%d0\n" \ 221 " neg.b %%d0\n" \ 222 " and.w #3,%%d0\n" \ 223 " sub.w %%d0,%2\n" \ 224 " bra 2f\n" \ 225 " 1: move.b (%0)+,(%1)\n" \ 226 " 2: dbf %%d0,1b\n" \ 227 " move.w %2,%%d0\n" \ 228 " lsr.w #5,%%d0\n" \ 229 " bra 4f\n" \ 230 " 3: move.l (%0)+,(%1)\n" \ 231 "31: move.l (%0)+,(%1)\n" \ 232 "32: move.l (%0)+,(%1)\n" \ 233 "33: move.l (%0)+,(%1)\n" \ 234 "34: move.l (%0)+,(%1)\n" \ 235 "35: move.l (%0)+,(%1)\n" \ 236 "36: move.l (%0)+,(%1)\n" \ 237 "37: move.l (%0)+,(%1)\n" \ 238 " 4: dbf %%d0,3b\n" \ 239 " move.w %2,%%d0\n" \ 240 " lsr.w #2,%%d0\n" \ 241 " and.w #7,%%d0\n" \ 242 " bra 6f\n" \ 243 " 5: move.l (%0)+,(%1)\n" \ 244 " 6: dbf %%d0,5b\n" \ 245 " and.w #3,%2\n" \ 246 " bra 8f\n" \ 247 " 7: move.b (%0)+,(%1)\n" \ 248 " 8: dbf %2,7b\n" \ 249 " moveq.l #0, %2\n" \ 250 " 9: \n" \ 251 ".section .fixup,\"ax\"\n" \ 252 " .even\n" \ 253 "91: moveq.l #1, %2\n" \ 254 " jra 9b\n" \ 255 "94: moveq.l #4, %2\n" \ 256 " jra 9b\n" \ 257 ".previous\n" \ 258 ".section __ex_table,\"a\"\n" \ 259 " .align 4\n" \ 260 " .long 1b,91b\n" \ 261 " .long 3b,94b\n" \ 262 " .long 31b,94b\n" \ 263 " .long 32b,94b\n" \ 264 " .long 33b,94b\n" \ 265 " .long 34b,94b\n" \ 266 " .long 35b,94b\n" \ 267 " .long 36b,94b\n" \ 268 " .long 37b,94b\n" \ 269 " .long 5b,94b\n" \ 270 " .long 7b,91b\n" \ 271 ".previous" \ 272 : "=a"(s), "=a"(d), "=d"(n) \ 273 : "0"(s), "1"(d), "2"(n) \ 274 : "d0") 275 276 static int macscsi_pwrite(struct Scsi_Host *instance, 277 unsigned char *src, int len) 278 { 279 struct NCR5380_hostdata *hostdata = shost_priv(instance); 280 unsigned char *s = src; 281 unsigned char *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4); 282 int n = len; 283 int transferred; 284 285 while (!NCR5380_poll_politely(instance, BUS_AND_STATUS_REG, 286 BASR_DRQ | BASR_PHASE_MATCH, 287 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 288 CP_MEM_TO_IO(s, d, n); 289 290 transferred = s - src - n; 291 hostdata->pdma_residual = len - transferred; 292 293 /* Target changed phase early? */ 294 if (NCR5380_poll_politely2(instance, STATUS_REG, SR_REQ, SR_REQ, 295 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0) 296 scmd_printk(KERN_ERR, hostdata->connected, 297 "%s: !REQ and !ACK\n", __func__); 298 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 299 return 0; 300 301 /* No bus error. */ 302 if (n == 0) { 303 if (NCR5380_poll_politely(instance, TARGET_COMMAND_REG, 304 TCR_LAST_BYTE_SENT, 305 TCR_LAST_BYTE_SENT, HZ / 64) < 0) 306 scmd_printk(KERN_ERR, hostdata->connected, 307 "%s: Last Byte Sent timeout\n", __func__); 308 return 0; 309 } 310 311 dsprintk(NDEBUG_PSEUDO_DMA, instance, 312 "%s: bus error (%d/%d)\n", __func__, transferred, len); 313 NCR5380_dprint(NDEBUG_PSEUDO_DMA, instance); 314 s = src + transferred; 315 n = len - transferred; 316 } 317 318 scmd_printk(KERN_ERR, hostdata->connected, 319 "%s: phase mismatch or !DRQ\n", __func__); 320 NCR5380_dprint(NDEBUG_PSEUDO_DMA, instance); 321 322 return -1; 323 } 324 325 static int macscsi_dma_xfer_len(struct Scsi_Host *instance, 326 struct scsi_cmnd *cmd) 327 { 328 struct NCR5380_hostdata *hostdata = shost_priv(instance); 329 330 if (hostdata->flags & FLAG_NO_PSEUDO_DMA || 331 cmd->SCp.this_residual < 16) 332 return 0; 333 334 return cmd->SCp.this_residual; 335 } 336 337 #include "NCR5380.c" 338 339 #define DRV_MODULE_NAME "mac_scsi" 340 #define PFX DRV_MODULE_NAME ": " 341 342 static struct scsi_host_template mac_scsi_template = { 343 .module = THIS_MODULE, 344 .proc_name = DRV_MODULE_NAME, 345 .name = "Macintosh NCR5380 SCSI", 346 .info = macscsi_info, 347 .queuecommand = macscsi_queue_command, 348 .eh_abort_handler = macscsi_abort, 349 .eh_bus_reset_handler = macscsi_bus_reset, 350 .can_queue = 16, 351 .this_id = 7, 352 .sg_tablesize = 1, 353 .cmd_per_lun = 2, 354 .use_clustering = DISABLE_CLUSTERING, 355 .cmd_size = NCR5380_CMD_SIZE, 356 .max_sectors = 128, 357 }; 358 359 static int __init mac_scsi_probe(struct platform_device *pdev) 360 { 361 struct Scsi_Host *instance; 362 struct NCR5380_hostdata *hostdata; 363 int error; 364 int host_flags = 0; 365 struct resource *irq, *pio_mem, *pdma_mem = NULL; 366 367 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 368 if (!pio_mem) 369 return -ENODEV; 370 371 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 372 373 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 374 375 if (!hwreg_present((unsigned char *)pio_mem->start + 376 (STATUS_REG << 4))) { 377 pr_info(PFX "no device detected at %pap\n", &pio_mem->start); 378 return -ENODEV; 379 } 380 381 if (setup_can_queue > 0) 382 mac_scsi_template.can_queue = setup_can_queue; 383 if (setup_cmd_per_lun > 0) 384 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun; 385 if (setup_sg_tablesize >= 0) 386 mac_scsi_template.sg_tablesize = setup_sg_tablesize; 387 if (setup_hostid >= 0) 388 mac_scsi_template.this_id = setup_hostid & 7; 389 390 instance = scsi_host_alloc(&mac_scsi_template, 391 sizeof(struct NCR5380_hostdata)); 392 if (!instance) 393 return -ENOMEM; 394 395 if (irq) 396 instance->irq = irq->start; 397 else 398 instance->irq = NO_IRQ; 399 400 hostdata = shost_priv(instance); 401 hostdata->base = pio_mem->start; 402 hostdata->io = (void *)pio_mem->start; 403 404 if (pdma_mem && setup_use_pdma) 405 hostdata->pdma_io = (void *)pdma_mem->start; 406 else 407 host_flags |= FLAG_NO_PSEUDO_DMA; 408 409 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; 410 411 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP); 412 if (error) 413 goto fail_init; 414 415 if (instance->irq != NO_IRQ) { 416 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED, 417 "NCR5380", instance); 418 if (error) 419 goto fail_irq; 420 } 421 422 NCR5380_maybe_reset_bus(instance); 423 424 error = scsi_add_host(instance, NULL); 425 if (error) 426 goto fail_host; 427 428 platform_set_drvdata(pdev, instance); 429 430 scsi_scan_host(instance); 431 return 0; 432 433 fail_host: 434 if (instance->irq != NO_IRQ) 435 free_irq(instance->irq, instance); 436 fail_irq: 437 NCR5380_exit(instance); 438 fail_init: 439 scsi_host_put(instance); 440 return error; 441 } 442 443 static int __exit mac_scsi_remove(struct platform_device *pdev) 444 { 445 struct Scsi_Host *instance = platform_get_drvdata(pdev); 446 447 scsi_remove_host(instance); 448 if (instance->irq != NO_IRQ) 449 free_irq(instance->irq, instance); 450 NCR5380_exit(instance); 451 scsi_host_put(instance); 452 return 0; 453 } 454 455 static struct platform_driver mac_scsi_driver = { 456 .remove = __exit_p(mac_scsi_remove), 457 .driver = { 458 .name = DRV_MODULE_NAME, 459 }, 460 }; 461 462 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe); 463 464 MODULE_ALIAS("platform:" DRV_MODULE_NAME); 465 MODULE_LICENSE("GPL"); 466