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