1 /* 2 * linux/drivers/acorn/scsi/powertec.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 #include <linux/module.h> 11 #include <linux/blkdev.h> 12 #include <linux/kernel.h> 13 #include <linux/string.h> 14 #include <linux/ioport.h> 15 #include <linux/sched.h> 16 #include <linux/proc_fs.h> 17 #include <linux/delay.h> 18 #include <linux/interrupt.h> 19 #include <linux/init.h> 20 #include <linux/dma-mapping.h> 21 22 #include <asm/dma.h> 23 #include <asm/ecard.h> 24 #include <asm/io.h> 25 #include <asm/pgtable.h> 26 27 #include "../scsi.h" 28 #include <scsi/scsi_host.h> 29 #include "fas216.h" 30 #include "scsi.h" 31 32 #include <scsi/scsicam.h> 33 34 #define POWERTEC_FAS216_OFFSET 0x3000 35 #define POWERTEC_FAS216_SHIFT 6 36 37 #define POWERTEC_INTR_STATUS 0x2000 38 #define POWERTEC_INTR_BIT 0x80 39 40 #define POWERTEC_RESET_CONTROL 0x1018 41 #define POWERTEC_RESET_BIT 1 42 43 #define POWERTEC_TERM_CONTROL 0x2018 44 #define POWERTEC_TERM_ENABLE 1 45 46 #define POWERTEC_INTR_CONTROL 0x101c 47 #define POWERTEC_INTR_ENABLE 1 48 #define POWERTEC_INTR_DISABLE 0 49 50 #define VERSION "1.10 (19/01/2003 2.5.59)" 51 52 /* 53 * Use term=0,1,0,0,0 to turn terminators on/off. 54 * One entry per slot. 55 */ 56 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; 57 58 #define NR_SG 256 59 60 struct powertec_info { 61 FAS216_Info info; 62 struct expansion_card *ec; 63 void __iomem *base; 64 unsigned int term_ctl; 65 struct scatterlist sg[NR_SG]; 66 }; 67 68 /* Prototype: void powertecscsi_irqenable(ec, irqnr) 69 * Purpose : Enable interrupts on Powertec SCSI card 70 * Params : ec - expansion card structure 71 * : irqnr - interrupt number 72 */ 73 static void 74 powertecscsi_irqenable(struct expansion_card *ec, int irqnr) 75 { 76 struct powertec_info *info = ec->irq_data; 77 writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); 78 } 79 80 /* Prototype: void powertecscsi_irqdisable(ec, irqnr) 81 * Purpose : Disable interrupts on Powertec SCSI card 82 * Params : ec - expansion card structure 83 * : irqnr - interrupt number 84 */ 85 static void 86 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) 87 { 88 struct powertec_info *info = ec->irq_data; 89 writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); 90 } 91 92 static const expansioncard_ops_t powertecscsi_ops = { 93 .irqenable = powertecscsi_irqenable, 94 .irqdisable = powertecscsi_irqdisable, 95 }; 96 97 /* Prototype: void powertecscsi_terminator_ctl(host, on_off) 98 * Purpose : Turn the Powertec SCSI terminators on or off 99 * Params : host - card to turn on/off 100 * : on_off - !0 to turn on, 0 to turn off 101 */ 102 static void 103 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) 104 { 105 struct powertec_info *info = (struct powertec_info *)host->hostdata; 106 107 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; 108 writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); 109 } 110 111 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) 112 * Purpose : handle interrupts from Powertec SCSI card 113 * Params : irq - interrupt number 114 * dev_id - user-defined (Scsi_Host structure) 115 * regs - processor registers at interrupt 116 */ 117 static irqreturn_t 118 powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs) 119 { 120 struct powertec_info *info = dev_id; 121 122 return fas216_intr(&info->info); 123 } 124 125 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) 126 * Purpose : initialises DMA/PIO 127 * Params : host - host 128 * SCpnt - command 129 * direction - DMA on to/off of card 130 * min_type - minimum DMA support that we must have for this transfer 131 * Returns : type of transfer to be performed 132 */ 133 static fasdmatype_t 134 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, 135 fasdmadir_t direction, fasdmatype_t min_type) 136 { 137 struct powertec_info *info = (struct powertec_info *)host->hostdata; 138 struct device *dev = scsi_get_device(host); 139 int dmach = info->info.scsi.dma; 140 141 if (info->info.ifcfg.capabilities & FASCAP_DMA && 142 min_type == fasdma_real_all) { 143 int bufs, map_dir, dma_dir; 144 145 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); 146 147 if (direction == DMA_OUT) 148 map_dir = DMA_TO_DEVICE, 149 dma_dir = DMA_MODE_WRITE; 150 else 151 map_dir = DMA_FROM_DEVICE, 152 dma_dir = DMA_MODE_READ; 153 154 dma_map_sg(dev, info->sg, bufs + 1, map_dir); 155 156 disable_dma(dmach); 157 set_dma_sg(dmach, info->sg, bufs + 1); 158 set_dma_mode(dmach, dma_dir); 159 enable_dma(dmach); 160 return fasdma_real_all; 161 } 162 163 /* 164 * If we're not doing DMA, 165 * we'll do slow PIO 166 */ 167 return fasdma_pio; 168 } 169 170 /* Prototype: int powertecscsi_dma_stop(host, SCpnt) 171 * Purpose : stops DMA/PIO 172 * Params : host - host 173 * SCpnt - command 174 */ 175 static void 176 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) 177 { 178 struct powertec_info *info = (struct powertec_info *)host->hostdata; 179 if (info->info.scsi.dma != NO_DMA) 180 disable_dma(info->info.scsi.dma); 181 } 182 183 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) 184 * Purpose : returns a descriptive string about this interface, 185 * Params : host - driver host structure to return info for. 186 * Returns : pointer to a static buffer containing null terminated string. 187 */ 188 const char *powertecscsi_info(struct Scsi_Host *host) 189 { 190 struct powertec_info *info = (struct powertec_info *)host->hostdata; 191 static char string[150]; 192 193 sprintf(string, "%s (%s) in slot %d v%s terminators o%s", 194 host->hostt->name, info->info.scsi.type, info->ec->slot_no, 195 VERSION, info->term_ctl ? "n" : "ff"); 196 197 return string; 198 } 199 200 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 201 * Purpose : Set a driver specific function 202 * Params : host - host to setup 203 * : buffer - buffer containing string describing operation 204 * : length - length of string 205 * Returns : -EINVAL, or 0 206 */ 207 static int 208 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 209 { 210 int ret = length; 211 212 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { 213 buffer += 12; 214 length -= 12; 215 216 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { 217 if (buffer[5] == '1') 218 powertecscsi_terminator_ctl(host, 1); 219 else if (buffer[5] == '0') 220 powertecscsi_terminator_ctl(host, 0); 221 else 222 ret = -EINVAL; 223 } else 224 ret = -EINVAL; 225 } else 226 ret = -EINVAL; 227 228 return ret; 229 } 230 231 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, 232 * int length, int host_no, int inout) 233 * Purpose : Return information about the driver to a user process accessing 234 * the /proc filesystem. 235 * Params : buffer - a buffer to write information to 236 * start - a pointer into this buffer set by this routine to the start 237 * of the required information. 238 * offset - offset into information that we have read upto. 239 * length - length of buffer 240 * inout - 0 for reading, 1 for writing. 241 * Returns : length of data written to buffer. 242 */ 243 int powertecscsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, 244 int length, int inout) 245 { 246 struct powertec_info *info; 247 char *p = buffer; 248 int pos; 249 250 if (inout == 1) 251 return powertecscsi_set_proc_info(host, buffer, length); 252 253 info = (struct powertec_info *)host->hostdata; 254 255 p += sprintf(p, "PowerTec SCSI driver v%s\n", VERSION); 256 p += fas216_print_host(&info->info, p); 257 p += sprintf(p, "Term : o%s\n", 258 info->term_ctl ? "n" : "ff"); 259 260 p += fas216_print_stats(&info->info, p); 261 p += fas216_print_devices(&info->info, p); 262 263 *start = buffer + offset; 264 pos = p - buffer - offset; 265 if (pos > length) 266 pos = length; 267 268 return pos; 269 } 270 271 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) 272 { 273 struct expansion_card *ec = ECARD_DEV(dev); 274 struct Scsi_Host *host = ecard_get_drvdata(ec); 275 struct powertec_info *info = (struct powertec_info *)host->hostdata; 276 277 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); 278 } 279 280 static ssize_t 281 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) 282 { 283 struct expansion_card *ec = ECARD_DEV(dev); 284 struct Scsi_Host *host = ecard_get_drvdata(ec); 285 286 if (len > 1) 287 powertecscsi_terminator_ctl(host, buf[0] != '0'); 288 289 return len; 290 } 291 292 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, 293 powertecscsi_show_term, powertecscsi_store_term); 294 295 static struct scsi_host_template powertecscsi_template = { 296 .module = THIS_MODULE, 297 .proc_info = powertecscsi_proc_info, 298 .name = "PowerTec SCSI", 299 .info = powertecscsi_info, 300 .queuecommand = fas216_queue_command, 301 .eh_host_reset_handler = fas216_eh_host_reset, 302 .eh_bus_reset_handler = fas216_eh_bus_reset, 303 .eh_device_reset_handler = fas216_eh_device_reset, 304 .eh_abort_handler = fas216_eh_abort, 305 306 .can_queue = 8, 307 .this_id = 7, 308 .sg_tablesize = SG_ALL, 309 .cmd_per_lun = 2, 310 .use_clustering = ENABLE_CLUSTERING, 311 .proc_name = "powertec", 312 }; 313 314 static int __devinit 315 powertecscsi_probe(struct expansion_card *ec, const struct ecard_id *id) 316 { 317 struct Scsi_Host *host; 318 struct powertec_info *info; 319 unsigned long resbase, reslen; 320 void __iomem *base; 321 int ret; 322 323 ret = ecard_request_resources(ec); 324 if (ret) 325 goto out; 326 327 resbase = ecard_resource_start(ec, ECARD_RES_IOCFAST); 328 reslen = ecard_resource_len(ec, ECARD_RES_IOCFAST); 329 base = ioremap(resbase, reslen); 330 if (!base) { 331 ret = -ENOMEM; 332 goto out_region; 333 } 334 335 host = scsi_host_alloc(&powertecscsi_template, 336 sizeof (struct powertec_info)); 337 if (!host) { 338 ret = -ENOMEM; 339 goto out_unmap; 340 } 341 342 ecard_set_drvdata(ec, host); 343 344 info = (struct powertec_info *)host->hostdata; 345 info->base = base; 346 powertecscsi_terminator_ctl(host, term[ec->slot_no]); 347 348 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; 349 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; 350 info->info.scsi.irq = ec->irq; 351 info->info.scsi.dma = ec->dma; 352 info->info.ifcfg.clockrate = 40; /* MHz */ 353 info->info.ifcfg.select_timeout = 255; 354 info->info.ifcfg.asyncperiod = 200; /* ns */ 355 info->info.ifcfg.sync_max_depth = 7; 356 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; 357 info->info.ifcfg.disconnect_ok = 1; 358 info->info.ifcfg.wide_max_size = 0; 359 info->info.ifcfg.capabilities = 0; 360 info->info.dma.setup = powertecscsi_dma_setup; 361 info->info.dma.pseudo = NULL; 362 info->info.dma.stop = powertecscsi_dma_stop; 363 364 ec->irqaddr = base + POWERTEC_INTR_STATUS; 365 ec->irqmask = POWERTEC_INTR_BIT; 366 ec->irq_data = info; 367 ec->ops = &powertecscsi_ops; 368 369 device_create_file(&ec->dev, &dev_attr_bus_term); 370 371 ret = fas216_init(host); 372 if (ret) 373 goto out_free; 374 375 ret = request_irq(ec->irq, powertecscsi_intr, 376 IRQF_DISABLED, "powertec", info); 377 if (ret) { 378 printk("scsi%d: IRQ%d not free: %d\n", 379 host->host_no, ec->irq, ret); 380 goto out_release; 381 } 382 383 if (info->info.scsi.dma != NO_DMA) { 384 if (request_dma(info->info.scsi.dma, "powertec")) { 385 printk("scsi%d: DMA%d not free, using PIO\n", 386 host->host_no, info->info.scsi.dma); 387 info->info.scsi.dma = NO_DMA; 388 } else { 389 set_dma_speed(info->info.scsi.dma, 180); 390 info->info.ifcfg.capabilities |= FASCAP_DMA; 391 } 392 } 393 394 ret = fas216_add(host, &ec->dev); 395 if (ret == 0) 396 goto out; 397 398 if (info->info.scsi.dma != NO_DMA) 399 free_dma(info->info.scsi.dma); 400 free_irq(ec->irq, host); 401 402 out_release: 403 fas216_release(host); 404 405 out_free: 406 device_remove_file(&ec->dev, &dev_attr_bus_term); 407 scsi_host_put(host); 408 409 out_unmap: 410 iounmap(base); 411 412 out_region: 413 ecard_release_resources(ec); 414 415 out: 416 return ret; 417 } 418 419 static void __devexit powertecscsi_remove(struct expansion_card *ec) 420 { 421 struct Scsi_Host *host = ecard_get_drvdata(ec); 422 struct powertec_info *info = (struct powertec_info *)host->hostdata; 423 424 ecard_set_drvdata(ec, NULL); 425 fas216_remove(host); 426 427 device_remove_file(&ec->dev, &dev_attr_bus_term); 428 429 if (info->info.scsi.dma != NO_DMA) 430 free_dma(info->info.scsi.dma); 431 free_irq(ec->irq, info); 432 433 iounmap(info->base); 434 435 fas216_release(host); 436 scsi_host_put(host); 437 ecard_release_resources(ec); 438 } 439 440 static const struct ecard_id powertecscsi_cids[] = { 441 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, 442 { 0xffff, 0xffff }, 443 }; 444 445 static struct ecard_driver powertecscsi_driver = { 446 .probe = powertecscsi_probe, 447 .remove = __devexit_p(powertecscsi_remove), 448 .id_table = powertecscsi_cids, 449 .drv = { 450 .name = "powertecscsi", 451 }, 452 }; 453 454 static int __init powertecscsi_init(void) 455 { 456 return ecard_register_driver(&powertecscsi_driver); 457 } 458 459 static void __exit powertecscsi_exit(void) 460 { 461 ecard_remove_driver(&powertecscsi_driver); 462 } 463 464 module_init(powertecscsi_init); 465 module_exit(powertecscsi_exit); 466 467 MODULE_AUTHOR("Russell King"); 468 MODULE_DESCRIPTION("Powertec SCSI driver"); 469 module_param_array(term, int, NULL, 0); 470 MODULE_PARM_DESC(term, "SCSI bus termination"); 471 MODULE_LICENSE("GPL"); 472