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 macscsi_dma_xfer_len 37 #define NCR5380_dma_recv_setup macscsi_pread 38 #define NCR5380_dma_send_setup macscsi_pwrite 39 #define NCR5380_dma_residual macscsi_dma_residual 40 41 #define NCR5380_intr macscsi_intr 42 #define NCR5380_queue_command macscsi_queue_command 43 #define NCR5380_abort macscsi_abort 44 #define NCR5380_bus_reset macscsi_bus_reset 45 #define NCR5380_info macscsi_info 46 47 #include "NCR5380.h" 48 49 static int setup_can_queue = -1; 50 module_param(setup_can_queue, int, 0); 51 static int setup_cmd_per_lun = -1; 52 module_param(setup_cmd_per_lun, int, 0); 53 static int setup_sg_tablesize = -1; 54 module_param(setup_sg_tablesize, int, 0); 55 static int setup_use_pdma = -1; 56 module_param(setup_use_pdma, int, 0); 57 static int setup_hostid = -1; 58 module_param(setup_hostid, int, 0); 59 static int setup_toshiba_delay = -1; 60 module_param(setup_toshiba_delay, int, 0); 61 62 #ifndef MODULE 63 static int __init mac_scsi_setup(char *str) 64 { 65 int ints[8]; 66 67 (void)get_options(str, ARRAY_SIZE(ints), ints); 68 69 if (ints[0] < 1) { 70 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n"); 71 return 0; 72 } 73 if (ints[0] >= 1) 74 setup_can_queue = ints[1]; 75 if (ints[0] >= 2) 76 setup_cmd_per_lun = ints[2]; 77 if (ints[0] >= 3) 78 setup_sg_tablesize = ints[3]; 79 if (ints[0] >= 4) 80 setup_hostid = ints[4]; 81 /* ints[5] (use_tagged_queuing) is ignored */ 82 if (ints[0] >= 6) 83 setup_use_pdma = ints[6]; 84 if (ints[0] >= 7) 85 setup_toshiba_delay = ints[7]; 86 return 1; 87 } 88 89 __setup("mac5380=", mac_scsi_setup); 90 #endif /* !MODULE */ 91 92 /* Pseudo DMA asm originally by Ove Edlund */ 93 94 #define CP_IO_TO_MEM(s,d,n) \ 95 __asm__ __volatile__ \ 96 (" cmp.w #4,%2\n" \ 97 " bls 8f\n" \ 98 " move.w %1,%%d0\n" \ 99 " neg.b %%d0\n" \ 100 " and.w #3,%%d0\n" \ 101 " sub.w %%d0,%2\n" \ 102 " bra 2f\n" \ 103 " 1: move.b (%0),(%1)+\n" \ 104 " 2: dbf %%d0,1b\n" \ 105 " move.w %2,%%d0\n" \ 106 " lsr.w #5,%%d0\n" \ 107 " bra 4f\n" \ 108 " 3: move.l (%0),(%1)+\n" \ 109 "31: move.l (%0),(%1)+\n" \ 110 "32: move.l (%0),(%1)+\n" \ 111 "33: move.l (%0),(%1)+\n" \ 112 "34: move.l (%0),(%1)+\n" \ 113 "35: move.l (%0),(%1)+\n" \ 114 "36: move.l (%0),(%1)+\n" \ 115 "37: move.l (%0),(%1)+\n" \ 116 " 4: dbf %%d0,3b\n" \ 117 " move.w %2,%%d0\n" \ 118 " lsr.w #2,%%d0\n" \ 119 " and.w #7,%%d0\n" \ 120 " bra 6f\n" \ 121 " 5: move.l (%0),(%1)+\n" \ 122 " 6: dbf %%d0,5b\n" \ 123 " and.w #3,%2\n" \ 124 " bra 8f\n" \ 125 " 7: move.b (%0),(%1)+\n" \ 126 " 8: dbf %2,7b\n" \ 127 " moveq.l #0, %2\n" \ 128 " 9: \n" \ 129 ".section .fixup,\"ax\"\n" \ 130 " .even\n" \ 131 "91: moveq.l #1, %2\n" \ 132 " jra 9b\n" \ 133 "94: moveq.l #4, %2\n" \ 134 " jra 9b\n" \ 135 ".previous\n" \ 136 ".section __ex_table,\"a\"\n" \ 137 " .align 4\n" \ 138 " .long 1b,91b\n" \ 139 " .long 3b,94b\n" \ 140 " .long 31b,94b\n" \ 141 " .long 32b,94b\n" \ 142 " .long 33b,94b\n" \ 143 " .long 34b,94b\n" \ 144 " .long 35b,94b\n" \ 145 " .long 36b,94b\n" \ 146 " .long 37b,94b\n" \ 147 " .long 5b,94b\n" \ 148 " .long 7b,91b\n" \ 149 ".previous" \ 150 : "=a"(s), "=a"(d), "=d"(n) \ 151 : "0"(s), "1"(d), "2"(n) \ 152 : "d0") 153 154 static inline int macscsi_pread(struct NCR5380_hostdata *hostdata, 155 unsigned char *dst, int len) 156 { 157 u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4); 158 unsigned char *d = dst; 159 int n = len; 160 int transferred; 161 162 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, 163 BASR_DRQ | BASR_PHASE_MATCH, 164 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 165 CP_IO_TO_MEM(s, d, n); 166 167 transferred = d - dst - n; 168 hostdata->pdma_residual = len - transferred; 169 170 /* No bus error. */ 171 if (n == 0) 172 return 0; 173 174 /* Target changed phase early? */ 175 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ, 176 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0) 177 scmd_printk(KERN_ERR, hostdata->connected, 178 "%s: !REQ and !ACK\n", __func__); 179 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 180 return 0; 181 182 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, 183 "%s: bus error (%d/%d)\n", __func__, transferred, len); 184 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 185 d = dst + transferred; 186 n = len - transferred; 187 } 188 189 scmd_printk(KERN_ERR, hostdata->connected, 190 "%s: phase mismatch or !DRQ\n", __func__); 191 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 192 return -1; 193 } 194 195 196 #define CP_MEM_TO_IO(s,d,n) \ 197 __asm__ __volatile__ \ 198 (" cmp.w #4,%2\n" \ 199 " bls 8f\n" \ 200 " move.w %0,%%d0\n" \ 201 " neg.b %%d0\n" \ 202 " and.w #3,%%d0\n" \ 203 " sub.w %%d0,%2\n" \ 204 " bra 2f\n" \ 205 " 1: move.b (%0)+,(%1)\n" \ 206 " 2: dbf %%d0,1b\n" \ 207 " move.w %2,%%d0\n" \ 208 " lsr.w #5,%%d0\n" \ 209 " bra 4f\n" \ 210 " 3: move.l (%0)+,(%1)\n" \ 211 "31: move.l (%0)+,(%1)\n" \ 212 "32: move.l (%0)+,(%1)\n" \ 213 "33: move.l (%0)+,(%1)\n" \ 214 "34: move.l (%0)+,(%1)\n" \ 215 "35: move.l (%0)+,(%1)\n" \ 216 "36: move.l (%0)+,(%1)\n" \ 217 "37: move.l (%0)+,(%1)\n" \ 218 " 4: dbf %%d0,3b\n" \ 219 " move.w %2,%%d0\n" \ 220 " lsr.w #2,%%d0\n" \ 221 " and.w #7,%%d0\n" \ 222 " bra 6f\n" \ 223 " 5: move.l (%0)+,(%1)\n" \ 224 " 6: dbf %%d0,5b\n" \ 225 " and.w #3,%2\n" \ 226 " bra 8f\n" \ 227 " 7: move.b (%0)+,(%1)\n" \ 228 " 8: dbf %2,7b\n" \ 229 " moveq.l #0, %2\n" \ 230 " 9: \n" \ 231 ".section .fixup,\"ax\"\n" \ 232 " .even\n" \ 233 "91: moveq.l #1, %2\n" \ 234 " jra 9b\n" \ 235 "94: moveq.l #4, %2\n" \ 236 " jra 9b\n" \ 237 ".previous\n" \ 238 ".section __ex_table,\"a\"\n" \ 239 " .align 4\n" \ 240 " .long 1b,91b\n" \ 241 " .long 3b,94b\n" \ 242 " .long 31b,94b\n" \ 243 " .long 32b,94b\n" \ 244 " .long 33b,94b\n" \ 245 " .long 34b,94b\n" \ 246 " .long 35b,94b\n" \ 247 " .long 36b,94b\n" \ 248 " .long 37b,94b\n" \ 249 " .long 5b,94b\n" \ 250 " .long 7b,91b\n" \ 251 ".previous" \ 252 : "=a"(s), "=a"(d), "=d"(n) \ 253 : "0"(s), "1"(d), "2"(n) \ 254 : "d0") 255 256 static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata, 257 unsigned char *src, int len) 258 { 259 unsigned char *s = src; 260 u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4); 261 int n = len; 262 int transferred; 263 264 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, 265 BASR_DRQ | BASR_PHASE_MATCH, 266 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 267 CP_MEM_TO_IO(s, d, n); 268 269 transferred = s - src - n; 270 hostdata->pdma_residual = len - transferred; 271 272 /* Target changed phase early? */ 273 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ, 274 BUS_AND_STATUS_REG, BASR_ACK, BASR_ACK, HZ / 64) < 0) 275 scmd_printk(KERN_ERR, hostdata->connected, 276 "%s: !REQ and !ACK\n", __func__); 277 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 278 return 0; 279 280 /* No bus error. */ 281 if (n == 0) { 282 if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG, 283 TCR_LAST_BYTE_SENT, 284 TCR_LAST_BYTE_SENT, HZ / 64) < 0) 285 scmd_printk(KERN_ERR, hostdata->connected, 286 "%s: Last Byte Sent timeout\n", __func__); 287 return 0; 288 } 289 290 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, 291 "%s: bus error (%d/%d)\n", __func__, transferred, len); 292 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 293 s = src + transferred; 294 n = len - transferred; 295 } 296 297 scmd_printk(KERN_ERR, hostdata->connected, 298 "%s: phase mismatch or !DRQ\n", __func__); 299 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 300 301 return -1; 302 } 303 304 static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata, 305 struct scsi_cmnd *cmd) 306 { 307 if (hostdata->flags & FLAG_NO_PSEUDO_DMA || 308 cmd->SCp.this_residual < 16) 309 return 0; 310 311 return cmd->SCp.this_residual; 312 } 313 314 static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata) 315 { 316 return hostdata->pdma_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 = (u8 __iomem *)pio_mem->start; 385 386 if (pdma_mem && setup_use_pdma) 387 hostdata->pdma_io = (u8 __iomem *)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