1 /* 2 * linux/drivers/acorn/scsi/cumana_2.c 3 * 4 * Copyright (C) 1997-2005 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Changelog: 11 * 30-08-1997 RMK 0.0.0 Created, READONLY version. 12 * 22-01-1998 RMK 0.0.1 Updated to 2.1.80. 13 * 15-04-1998 RMK 0.0.1 Only do PIO if FAS216 will allow it. 14 * 02-05-1998 RMK 0.0.2 Updated & added DMA support. 15 * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h 16 * 18-08-1998 RMK 0.0.3 Fixed synchronous transfer depth. 17 * 02-04-2000 RMK 0.0.4 Updated for new error handling code. 18 */ 19 #include <linux/module.h> 20 #include <linux/blkdev.h> 21 #include <linux/kernel.h> 22 #include <linux/string.h> 23 #include <linux/ioport.h> 24 #include <linux/proc_fs.h> 25 #include <linux/delay.h> 26 #include <linux/interrupt.h> 27 #include <linux/init.h> 28 #include <linux/dma-mapping.h> 29 30 #include <asm/dma.h> 31 #include <asm/ecard.h> 32 #include <asm/io.h> 33 #include <asm/pgtable.h> 34 35 #include "../scsi.h" 36 #include <scsi/scsi_host.h> 37 #include "fas216.h" 38 #include "scsi.h" 39 40 #include <scsi/scsicam.h> 41 42 #define CUMANASCSI2_STATUS (0x0000) 43 #define STATUS_INT (1 << 0) 44 #define STATUS_DRQ (1 << 1) 45 #define STATUS_LATCHED (1 << 3) 46 47 #define CUMANASCSI2_ALATCH (0x0014) 48 #define ALATCH_ENA_INT (3) 49 #define ALATCH_DIS_INT (2) 50 #define ALATCH_ENA_TERM (5) 51 #define ALATCH_DIS_TERM (4) 52 #define ALATCH_ENA_BIT32 (11) 53 #define ALATCH_DIS_BIT32 (10) 54 #define ALATCH_ENA_DMA (13) 55 #define ALATCH_DIS_DMA (12) 56 #define ALATCH_DMA_OUT (15) 57 #define ALATCH_DMA_IN (14) 58 59 #define CUMANASCSI2_PSEUDODMA (0x0200) 60 61 #define CUMANASCSI2_FAS216_OFFSET (0x0300) 62 #define CUMANASCSI2_FAS216_SHIFT 2 63 64 /* 65 * Version 66 */ 67 #define VERSION "1.00 (13/11/2002 2.5.47)" 68 69 /* 70 * Use term=0,1,0,0,0 to turn terminators on/off 71 */ 72 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; 73 74 #define NR_SG 256 75 76 struct cumanascsi2_info { 77 FAS216_Info info; 78 struct expansion_card *ec; 79 void __iomem *base; 80 unsigned int terms; /* Terminator state */ 81 struct scatterlist sg[NR_SG]; /* Scatter DMA list */ 82 }; 83 84 #define CSTATUS_IRQ (1 << 0) 85 #define CSTATUS_DRQ (1 << 1) 86 87 /* Prototype: void cumanascsi_2_irqenable(ec, irqnr) 88 * Purpose : Enable interrupts on Cumana SCSI 2 card 89 * Params : ec - expansion card structure 90 * : irqnr - interrupt number 91 */ 92 static void 93 cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr) 94 { 95 struct cumanascsi2_info *info = ec->irq_data; 96 writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH); 97 } 98 99 /* Prototype: void cumanascsi_2_irqdisable(ec, irqnr) 100 * Purpose : Disable interrupts on Cumana SCSI 2 card 101 * Params : ec - expansion card structure 102 * : irqnr - interrupt number 103 */ 104 static void 105 cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr) 106 { 107 struct cumanascsi2_info *info = ec->irq_data; 108 writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH); 109 } 110 111 static const expansioncard_ops_t cumanascsi_2_ops = { 112 .irqenable = cumanascsi_2_irqenable, 113 .irqdisable = cumanascsi_2_irqdisable, 114 }; 115 116 /* Prototype: void cumanascsi_2_terminator_ctl(host, on_off) 117 * Purpose : Turn the Cumana SCSI 2 terminators on or off 118 * Params : host - card to turn on/off 119 * : on_off - !0 to turn on, 0 to turn off 120 */ 121 static void 122 cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off) 123 { 124 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 125 126 if (on_off) { 127 info->terms = 1; 128 writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH); 129 } else { 130 info->terms = 0; 131 writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH); 132 } 133 } 134 135 /* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs) 136 * Purpose : handle interrupts from Cumana SCSI 2 card 137 * Params : irq - interrupt number 138 * dev_id - user-defined (Scsi_Host structure) 139 */ 140 static irqreturn_t 141 cumanascsi_2_intr(int irq, void *dev_id) 142 { 143 struct cumanascsi2_info *info = dev_id; 144 145 return fas216_intr(&info->info); 146 } 147 148 /* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type) 149 * Purpose : initialises DMA/PIO 150 * Params : host - host 151 * SCpnt - command 152 * direction - DMA on to/off of card 153 * min_type - minimum DMA support that we must have for this transfer 154 * Returns : type of transfer to be performed 155 */ 156 static fasdmatype_t 157 cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, 158 fasdmadir_t direction, fasdmatype_t min_type) 159 { 160 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 161 struct device *dev = scsi_get_device(host); 162 int dmach = info->info.scsi.dma; 163 164 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH); 165 166 if (dmach != NO_DMA && 167 (min_type == fasdma_real_all || SCp->this_residual >= 512)) { 168 int bufs, map_dir, dma_dir, alatch_dir; 169 170 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); 171 172 if (direction == DMA_OUT) 173 map_dir = DMA_TO_DEVICE, 174 dma_dir = DMA_MODE_WRITE, 175 alatch_dir = ALATCH_DMA_OUT; 176 else 177 map_dir = DMA_FROM_DEVICE, 178 dma_dir = DMA_MODE_READ, 179 alatch_dir = ALATCH_DMA_IN; 180 181 dma_map_sg(dev, info->sg, bufs, map_dir); 182 183 disable_dma(dmach); 184 set_dma_sg(dmach, info->sg, bufs); 185 writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH); 186 set_dma_mode(dmach, dma_dir); 187 enable_dma(dmach); 188 writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH); 189 writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH); 190 return fasdma_real_all; 191 } 192 193 /* 194 * If we're not doing DMA, 195 * we'll do pseudo DMA 196 */ 197 return fasdma_pio; 198 } 199 200 /* 201 * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer) 202 * Purpose : handles pseudo DMA 203 * Params : host - host 204 * SCpnt - command 205 * direction - DMA on to/off of card 206 * transfer - minimum number of bytes we expect to transfer 207 */ 208 static void 209 cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp, 210 fasdmadir_t direction, int transfer) 211 { 212 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 213 unsigned int length; 214 unsigned char *addr; 215 216 length = SCp->this_residual; 217 addr = SCp->ptr; 218 219 if (direction == DMA_OUT) 220 #if 0 221 while (length > 1) { 222 unsigned long word; 223 unsigned int status = readb(info->base + CUMANASCSI2_STATUS); 224 225 if (status & STATUS_INT) 226 goto end; 227 228 if (!(status & STATUS_DRQ)) 229 continue; 230 231 word = *addr | *(addr + 1) << 8; 232 writew(word, info->base + CUMANASCSI2_PSEUDODMA); 233 addr += 2; 234 length -= 2; 235 } 236 #else 237 printk ("PSEUDO_OUT???\n"); 238 #endif 239 else { 240 if (transfer && (transfer & 255)) { 241 while (length >= 256) { 242 unsigned int status = readb(info->base + CUMANASCSI2_STATUS); 243 244 if (status & STATUS_INT) 245 return; 246 247 if (!(status & STATUS_DRQ)) 248 continue; 249 250 readsw(info->base + CUMANASCSI2_PSEUDODMA, 251 addr, 256 >> 1); 252 addr += 256; 253 length -= 256; 254 } 255 } 256 257 while (length > 0) { 258 unsigned long word; 259 unsigned int status = readb(info->base + CUMANASCSI2_STATUS); 260 261 if (status & STATUS_INT) 262 return; 263 264 if (!(status & STATUS_DRQ)) 265 continue; 266 267 word = readw(info->base + CUMANASCSI2_PSEUDODMA); 268 *addr++ = word; 269 if (--length > 0) { 270 *addr++ = word >> 8; 271 length --; 272 } 273 } 274 } 275 } 276 277 /* Prototype: int cumanascsi_2_dma_stop(host, SCpnt) 278 * Purpose : stops DMA/PIO 279 * Params : host - host 280 * SCpnt - command 281 */ 282 static void 283 cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) 284 { 285 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 286 if (info->info.scsi.dma != NO_DMA) { 287 writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH); 288 disable_dma(info->info.scsi.dma); 289 } 290 } 291 292 /* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host) 293 * Purpose : returns a descriptive string about this interface, 294 * Params : host - driver host structure to return info for. 295 * Returns : pointer to a static buffer containing null terminated string. 296 */ 297 const char *cumanascsi_2_info(struct Scsi_Host *host) 298 { 299 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 300 static char string[150]; 301 302 sprintf(string, "%s (%s) in slot %d v%s terminators o%s", 303 host->hostt->name, info->info.scsi.type, info->ec->slot_no, 304 VERSION, info->terms ? "n" : "ff"); 305 306 return string; 307 } 308 309 /* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 310 * Purpose : Set a driver specific function 311 * Params : host - host to setup 312 * : buffer - buffer containing string describing operation 313 * : length - length of string 314 * Returns : -EINVAL, or 0 315 */ 316 static int 317 cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 318 { 319 int ret = length; 320 321 if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) { 322 buffer += 11; 323 length -= 11; 324 325 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { 326 if (buffer[5] == '1') 327 cumanascsi_2_terminator_ctl(host, 1); 328 else if (buffer[5] == '0') 329 cumanascsi_2_terminator_ctl(host, 0); 330 else 331 ret = -EINVAL; 332 } else 333 ret = -EINVAL; 334 } else 335 ret = -EINVAL; 336 337 return ret; 338 } 339 340 static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host) 341 { 342 struct cumanascsi2_info *info; 343 info = (struct cumanascsi2_info *)host->hostdata; 344 345 seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION); 346 fas216_print_host(&info->info, m); 347 seq_printf(m, "Term : o%s\n", 348 info->terms ? "n" : "ff"); 349 350 fas216_print_stats(&info->info, m); 351 fas216_print_devices(&info->info, m); 352 return 0; 353 } 354 355 static struct scsi_host_template cumanascsi2_template = { 356 .module = THIS_MODULE, 357 .show_info = cumanascsi_2_show_info, 358 .write_info = cumanascsi_2_set_proc_info, 359 .name = "Cumana SCSI II", 360 .info = cumanascsi_2_info, 361 .queuecommand = fas216_queue_command, 362 .eh_host_reset_handler = fas216_eh_host_reset, 363 .eh_bus_reset_handler = fas216_eh_bus_reset, 364 .eh_device_reset_handler = fas216_eh_device_reset, 365 .eh_abort_handler = fas216_eh_abort, 366 .can_queue = 1, 367 .this_id = 7, 368 .sg_tablesize = SCSI_MAX_SG_CHAIN_SEGMENTS, 369 .dma_boundary = IOMD_DMA_BOUNDARY, 370 .use_clustering = DISABLE_CLUSTERING, 371 .proc_name = "cumanascsi2", 372 }; 373 374 static int cumanascsi2_probe(struct expansion_card *ec, 375 const struct ecard_id *id) 376 { 377 struct Scsi_Host *host; 378 struct cumanascsi2_info *info; 379 void __iomem *base; 380 int ret; 381 382 ret = ecard_request_resources(ec); 383 if (ret) 384 goto out; 385 386 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 387 if (!base) { 388 ret = -ENOMEM; 389 goto out_region; 390 } 391 392 host = scsi_host_alloc(&cumanascsi2_template, 393 sizeof(struct cumanascsi2_info)); 394 if (!host) { 395 ret = -ENOMEM; 396 goto out_region; 397 } 398 399 ecard_set_drvdata(ec, host); 400 401 info = (struct cumanascsi2_info *)host->hostdata; 402 info->ec = ec; 403 info->base = base; 404 405 cumanascsi_2_terminator_ctl(host, term[ec->slot_no]); 406 407 info->info.scsi.io_base = base + CUMANASCSI2_FAS216_OFFSET; 408 info->info.scsi.io_shift = CUMANASCSI2_FAS216_SHIFT; 409 info->info.scsi.irq = ec->irq; 410 info->info.scsi.dma = ec->dma; 411 info->info.ifcfg.clockrate = 40; /* MHz */ 412 info->info.ifcfg.select_timeout = 255; 413 info->info.ifcfg.asyncperiod = 200; /* ns */ 414 info->info.ifcfg.sync_max_depth = 7; 415 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; 416 info->info.ifcfg.disconnect_ok = 1; 417 info->info.ifcfg.wide_max_size = 0; 418 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; 419 info->info.dma.setup = cumanascsi_2_dma_setup; 420 info->info.dma.pseudo = cumanascsi_2_dma_pseudo; 421 info->info.dma.stop = cumanascsi_2_dma_stop; 422 423 ec->irqaddr = info->base + CUMANASCSI2_STATUS; 424 ec->irqmask = STATUS_INT; 425 426 ecard_setirq(ec, &cumanascsi_2_ops, info); 427 428 ret = fas216_init(host); 429 if (ret) 430 goto out_free; 431 432 ret = request_irq(ec->irq, cumanascsi_2_intr, 433 0, "cumanascsi2", info); 434 if (ret) { 435 printk("scsi%d: IRQ%d not free: %d\n", 436 host->host_no, ec->irq, ret); 437 goto out_release; 438 } 439 440 if (info->info.scsi.dma != NO_DMA) { 441 if (request_dma(info->info.scsi.dma, "cumanascsi2")) { 442 printk("scsi%d: DMA%d not free, using PIO\n", 443 host->host_no, info->info.scsi.dma); 444 info->info.scsi.dma = NO_DMA; 445 } else { 446 set_dma_speed(info->info.scsi.dma, 180); 447 info->info.ifcfg.capabilities |= FASCAP_DMA; 448 } 449 } 450 451 ret = fas216_add(host, &ec->dev); 452 if (ret == 0) 453 goto out; 454 455 if (info->info.scsi.dma != NO_DMA) 456 free_dma(info->info.scsi.dma); 457 free_irq(ec->irq, host); 458 459 out_release: 460 fas216_release(host); 461 462 out_free: 463 scsi_host_put(host); 464 465 out_region: 466 ecard_release_resources(ec); 467 468 out: 469 return ret; 470 } 471 472 static void cumanascsi2_remove(struct expansion_card *ec) 473 { 474 struct Scsi_Host *host = ecard_get_drvdata(ec); 475 struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata; 476 477 ecard_set_drvdata(ec, NULL); 478 fas216_remove(host); 479 480 if (info->info.scsi.dma != NO_DMA) 481 free_dma(info->info.scsi.dma); 482 free_irq(ec->irq, info); 483 484 fas216_release(host); 485 scsi_host_put(host); 486 ecard_release_resources(ec); 487 } 488 489 static const struct ecard_id cumanascsi2_cids[] = { 490 { MANU_CUMANA, PROD_CUMANA_SCSI_2 }, 491 { 0xffff, 0xffff }, 492 }; 493 494 static struct ecard_driver cumanascsi2_driver = { 495 .probe = cumanascsi2_probe, 496 .remove = cumanascsi2_remove, 497 .id_table = cumanascsi2_cids, 498 .drv = { 499 .name = "cumanascsi2", 500 }, 501 }; 502 503 static int __init cumanascsi2_init(void) 504 { 505 return ecard_register_driver(&cumanascsi2_driver); 506 } 507 508 static void __exit cumanascsi2_exit(void) 509 { 510 ecard_remove_driver(&cumanascsi2_driver); 511 } 512 513 module_init(cumanascsi2_init); 514 module_exit(cumanascsi2_exit); 515 516 MODULE_AUTHOR("Russell King"); 517 MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines"); 518 module_param_array(term, int, NULL, 0); 519 MODULE_PARM_DESC(term, "SCSI bus termination"); 520 MODULE_LICENSE("GPL"); 521