1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/drivers/acorn/scsi/powertec.c 4 * 5 * Copyright (C) 1997-2005 Russell King 6 */ 7 #include <linux/module.h> 8 #include <linux/blkdev.h> 9 #include <linux/kernel.h> 10 #include <linux/string.h> 11 #include <linux/ioport.h> 12 #include <linux/proc_fs.h> 13 #include <linux/delay.h> 14 #include <linux/interrupt.h> 15 #include <linux/init.h> 16 #include <linux/dma-mapping.h> 17 #include <linux/pgtable.h> 18 19 #include <asm/dma.h> 20 #include <asm/ecard.h> 21 #include <asm/io.h> 22 23 #include <scsi/scsi.h> 24 #include <scsi/scsi_cmnd.h> 25 #include <scsi/scsi_device.h> 26 #include <scsi/scsi_eh.h> 27 #include <scsi/scsi_host.h> 28 #include <scsi/scsi_tcq.h> 29 #include "fas216.h" 30 #include "arm_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 */ 116 static irqreturn_t powertecscsi_intr(int irq, void *dev_id) 117 { 118 struct powertec_info *info = dev_id; 119 120 return fas216_intr(&info->info); 121 } 122 123 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) 124 * Purpose : initialises DMA/PIO 125 * Params : host - host 126 * SCpnt - command 127 * direction - DMA on to/off of card 128 * min_type - minimum DMA support that we must have for this transfer 129 * Returns : type of transfer to be performed 130 */ 131 static fasdmatype_t 132 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, 133 fasdmadir_t direction, fasdmatype_t min_type) 134 { 135 struct powertec_info *info = (struct powertec_info *)host->hostdata; 136 struct device *dev = scsi_get_device(host); 137 int dmach = info->info.scsi.dma; 138 139 if (info->info.ifcfg.capabilities & FASCAP_DMA && 140 min_type == fasdma_real_all) { 141 int bufs, map_dir, dma_dir; 142 143 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); 144 145 if (direction == DMA_OUT) { 146 map_dir = DMA_TO_DEVICE; 147 dma_dir = DMA_MODE_WRITE; 148 } else { 149 map_dir = DMA_FROM_DEVICE; 150 dma_dir = DMA_MODE_READ; 151 } 152 153 dma_map_sg(dev, info->sg, bufs, map_dir); 154 155 disable_dma(dmach); 156 set_dma_sg(dmach, info->sg, bufs); 157 set_dma_mode(dmach, dma_dir); 158 enable_dma(dmach); 159 return fasdma_real_all; 160 } 161 162 /* 163 * If we're not doing DMA, 164 * we'll do slow PIO 165 */ 166 return fasdma_pio; 167 } 168 169 /* Prototype: int powertecscsi_dma_stop(host, SCpnt) 170 * Purpose : stops DMA/PIO 171 * Params : host - host 172 * SCpnt - command 173 */ 174 static void 175 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) 176 { 177 struct powertec_info *info = (struct powertec_info *)host->hostdata; 178 if (info->info.scsi.dma != NO_DMA) 179 disable_dma(info->info.scsi.dma); 180 } 181 182 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) 183 * Purpose : returns a descriptive string about this interface, 184 * Params : host - driver host structure to return info for. 185 * Returns : pointer to a static buffer containing null terminated string. 186 */ 187 const char *powertecscsi_info(struct Scsi_Host *host) 188 { 189 struct powertec_info *info = (struct powertec_info *)host->hostdata; 190 static char string[150]; 191 192 sprintf(string, "%s (%s) in slot %d v%s terminators o%s", 193 host->hostt->name, info->info.scsi.type, info->ec->slot_no, 194 VERSION, info->term_ctl ? "n" : "ff"); 195 196 return string; 197 } 198 199 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 200 * Purpose : Set a driver specific function 201 * Params : host - host to setup 202 * : buffer - buffer containing string describing operation 203 * : length - length of string 204 * Returns : -EINVAL, or 0 205 */ 206 static int 207 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 208 { 209 int ret = length; 210 211 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { 212 buffer += 12; 213 length -= 12; 214 215 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { 216 if (buffer[5] == '1') 217 powertecscsi_terminator_ctl(host, 1); 218 else if (buffer[5] == '0') 219 powertecscsi_terminator_ctl(host, 0); 220 else 221 ret = -EINVAL; 222 } else 223 ret = -EINVAL; 224 } else 225 ret = -EINVAL; 226 227 return ret; 228 } 229 230 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, 231 * int length, int host_no, int inout) 232 * Purpose : Return information about the driver to a user process accessing 233 * the /proc filesystem. 234 * Params : buffer - a buffer to write information to 235 * start - a pointer into this buffer set by this routine to the start 236 * of the required information. 237 * offset - offset into information that we have read up to. 238 * length - length of buffer 239 * inout - 0 for reading, 1 for writing. 240 * Returns : length of data written to buffer. 241 */ 242 static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host) 243 { 244 struct powertec_info *info; 245 246 info = (struct powertec_info *)host->hostdata; 247 248 seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION); 249 fas216_print_host(&info->info, m); 250 seq_printf(m, "Term : o%s\n", 251 info->term_ctl ? "n" : "ff"); 252 253 fas216_print_stats(&info->info, m); 254 fas216_print_devices(&info->info, m); 255 return 0; 256 } 257 258 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) 259 { 260 struct expansion_card *ec = ECARD_DEV(dev); 261 struct Scsi_Host *host = ecard_get_drvdata(ec); 262 struct powertec_info *info = (struct powertec_info *)host->hostdata; 263 264 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); 265 } 266 267 static ssize_t 268 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) 269 { 270 struct expansion_card *ec = ECARD_DEV(dev); 271 struct Scsi_Host *host = ecard_get_drvdata(ec); 272 273 if (len > 1) 274 powertecscsi_terminator_ctl(host, buf[0] != '0'); 275 276 return len; 277 } 278 279 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, 280 powertecscsi_show_term, powertecscsi_store_term); 281 282 static struct scsi_host_template powertecscsi_template = { 283 .module = THIS_MODULE, 284 .show_info = powertecscsi_show_info, 285 .write_info = powertecscsi_set_proc_info, 286 .name = "PowerTec SCSI", 287 .info = powertecscsi_info, 288 .queuecommand = fas216_queue_command, 289 .eh_host_reset_handler = fas216_eh_host_reset, 290 .eh_bus_reset_handler = fas216_eh_bus_reset, 291 .eh_device_reset_handler = fas216_eh_device_reset, 292 .eh_abort_handler = fas216_eh_abort, 293 .cmd_size = sizeof(struct fas216_cmd_priv), 294 .can_queue = 8, 295 .this_id = 7, 296 .sg_tablesize = SG_MAX_SEGMENTS, 297 .dma_boundary = IOMD_DMA_BOUNDARY, 298 .cmd_per_lun = 2, 299 .proc_name = "powertec", 300 }; 301 302 static int powertecscsi_probe(struct expansion_card *ec, 303 const struct ecard_id *id) 304 { 305 struct Scsi_Host *host; 306 struct powertec_info *info; 307 void __iomem *base; 308 int ret; 309 310 ret = ecard_request_resources(ec); 311 if (ret) 312 goto out; 313 314 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 315 if (!base) { 316 ret = -ENOMEM; 317 goto out_region; 318 } 319 320 host = scsi_host_alloc(&powertecscsi_template, 321 sizeof (struct powertec_info)); 322 if (!host) { 323 ret = -ENOMEM; 324 goto out_region; 325 } 326 327 ecard_set_drvdata(ec, host); 328 329 info = (struct powertec_info *)host->hostdata; 330 info->base = base; 331 powertecscsi_terminator_ctl(host, term[ec->slot_no]); 332 333 info->ec = ec; 334 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; 335 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; 336 info->info.scsi.irq = ec->irq; 337 info->info.scsi.dma = ec->dma; 338 info->info.ifcfg.clockrate = 40; /* MHz */ 339 info->info.ifcfg.select_timeout = 255; 340 info->info.ifcfg.asyncperiod = 200; /* ns */ 341 info->info.ifcfg.sync_max_depth = 7; 342 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; 343 info->info.ifcfg.disconnect_ok = 1; 344 info->info.ifcfg.wide_max_size = 0; 345 info->info.ifcfg.capabilities = 0; 346 info->info.dma.setup = powertecscsi_dma_setup; 347 info->info.dma.pseudo = NULL; 348 info->info.dma.stop = powertecscsi_dma_stop; 349 350 ec->irqaddr = base + POWERTEC_INTR_STATUS; 351 ec->irqmask = POWERTEC_INTR_BIT; 352 353 ecard_setirq(ec, &powertecscsi_ops, info); 354 355 device_create_file(&ec->dev, &dev_attr_bus_term); 356 357 ret = fas216_init(host); 358 if (ret) 359 goto out_free; 360 361 ret = request_irq(ec->irq, powertecscsi_intr, 362 0, "powertec", info); 363 if (ret) { 364 printk("scsi%d: IRQ%d not free: %d\n", 365 host->host_no, ec->irq, ret); 366 goto out_release; 367 } 368 369 if (info->info.scsi.dma != NO_DMA) { 370 if (request_dma(info->info.scsi.dma, "powertec")) { 371 printk("scsi%d: DMA%d not free, using PIO\n", 372 host->host_no, info->info.scsi.dma); 373 info->info.scsi.dma = NO_DMA; 374 } else { 375 set_dma_speed(info->info.scsi.dma, 180); 376 info->info.ifcfg.capabilities |= FASCAP_DMA; 377 } 378 } 379 380 ret = fas216_add(host, &ec->dev); 381 if (ret == 0) 382 goto out; 383 384 if (info->info.scsi.dma != NO_DMA) 385 free_dma(info->info.scsi.dma); 386 free_irq(ec->irq, info); 387 388 out_release: 389 fas216_release(host); 390 391 out_free: 392 device_remove_file(&ec->dev, &dev_attr_bus_term); 393 scsi_host_put(host); 394 395 out_region: 396 ecard_release_resources(ec); 397 398 out: 399 return ret; 400 } 401 402 static void powertecscsi_remove(struct expansion_card *ec) 403 { 404 struct Scsi_Host *host = ecard_get_drvdata(ec); 405 struct powertec_info *info = (struct powertec_info *)host->hostdata; 406 407 ecard_set_drvdata(ec, NULL); 408 fas216_remove(host); 409 410 device_remove_file(&ec->dev, &dev_attr_bus_term); 411 412 if (info->info.scsi.dma != NO_DMA) 413 free_dma(info->info.scsi.dma); 414 free_irq(ec->irq, info); 415 416 fas216_release(host); 417 scsi_host_put(host); 418 ecard_release_resources(ec); 419 } 420 421 static const struct ecard_id powertecscsi_cids[] = { 422 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, 423 { 0xffff, 0xffff }, 424 }; 425 426 static struct ecard_driver powertecscsi_driver = { 427 .probe = powertecscsi_probe, 428 .remove = powertecscsi_remove, 429 .id_table = powertecscsi_cids, 430 .drv = { 431 .name = "powertecscsi", 432 }, 433 }; 434 435 static int __init powertecscsi_init(void) 436 { 437 return ecard_register_driver(&powertecscsi_driver); 438 } 439 440 static void __exit powertecscsi_exit(void) 441 { 442 ecard_remove_driver(&powertecscsi_driver); 443 } 444 445 module_init(powertecscsi_init); 446 module_exit(powertecscsi_exit); 447 448 MODULE_AUTHOR("Russell King"); 449 MODULE_DESCRIPTION("Powertec SCSI driver"); 450 module_param_array(term, int, NULL, 0); 451 MODULE_PARM_DESC(term, "SCSI bus termination"); 452 MODULE_LICENSE("GPL"); 453