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.h" 24 #include <scsi/scsi_host.h> 25 #include "fas216.h" 26 #include "scsi.h" 27 28 #include <scsi/scsicam.h> 29 30 #define POWERTEC_FAS216_OFFSET 0x3000 31 #define POWERTEC_FAS216_SHIFT 6 32 33 #define POWERTEC_INTR_STATUS 0x2000 34 #define POWERTEC_INTR_BIT 0x80 35 36 #define POWERTEC_RESET_CONTROL 0x1018 37 #define POWERTEC_RESET_BIT 1 38 39 #define POWERTEC_TERM_CONTROL 0x2018 40 #define POWERTEC_TERM_ENABLE 1 41 42 #define POWERTEC_INTR_CONTROL 0x101c 43 #define POWERTEC_INTR_ENABLE 1 44 #define POWERTEC_INTR_DISABLE 0 45 46 #define VERSION "1.10 (19/01/2003 2.5.59)" 47 48 /* 49 * Use term=0,1,0,0,0 to turn terminators on/off. 50 * One entry per slot. 51 */ 52 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 }; 53 54 #define NR_SG 256 55 56 struct powertec_info { 57 FAS216_Info info; 58 struct expansion_card *ec; 59 void __iomem *base; 60 unsigned int term_ctl; 61 struct scatterlist sg[NR_SG]; 62 }; 63 64 /* Prototype: void powertecscsi_irqenable(ec, irqnr) 65 * Purpose : Enable interrupts on Powertec SCSI card 66 * Params : ec - expansion card structure 67 * : irqnr - interrupt number 68 */ 69 static void 70 powertecscsi_irqenable(struct expansion_card *ec, int irqnr) 71 { 72 struct powertec_info *info = ec->irq_data; 73 writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL); 74 } 75 76 /* Prototype: void powertecscsi_irqdisable(ec, irqnr) 77 * Purpose : Disable interrupts on Powertec SCSI card 78 * Params : ec - expansion card structure 79 * : irqnr - interrupt number 80 */ 81 static void 82 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr) 83 { 84 struct powertec_info *info = ec->irq_data; 85 writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL); 86 } 87 88 static const expansioncard_ops_t powertecscsi_ops = { 89 .irqenable = powertecscsi_irqenable, 90 .irqdisable = powertecscsi_irqdisable, 91 }; 92 93 /* Prototype: void powertecscsi_terminator_ctl(host, on_off) 94 * Purpose : Turn the Powertec SCSI terminators on or off 95 * Params : host - card to turn on/off 96 * : on_off - !0 to turn on, 0 to turn off 97 */ 98 static void 99 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off) 100 { 101 struct powertec_info *info = (struct powertec_info *)host->hostdata; 102 103 info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0; 104 writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL); 105 } 106 107 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs) 108 * Purpose : handle interrupts from Powertec SCSI card 109 * Params : irq - interrupt number 110 * dev_id - user-defined (Scsi_Host structure) 111 */ 112 static irqreturn_t powertecscsi_intr(int irq, void *dev_id) 113 { 114 struct powertec_info *info = dev_id; 115 116 return fas216_intr(&info->info); 117 } 118 119 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type) 120 * Purpose : initialises DMA/PIO 121 * Params : host - host 122 * SCpnt - command 123 * direction - DMA on to/off of card 124 * min_type - minimum DMA support that we must have for this transfer 125 * Returns : type of transfer to be performed 126 */ 127 static fasdmatype_t 128 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, 129 fasdmadir_t direction, fasdmatype_t min_type) 130 { 131 struct powertec_info *info = (struct powertec_info *)host->hostdata; 132 struct device *dev = scsi_get_device(host); 133 int dmach = info->info.scsi.dma; 134 135 if (info->info.ifcfg.capabilities & FASCAP_DMA && 136 min_type == fasdma_real_all) { 137 int bufs, map_dir, dma_dir; 138 139 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG); 140 141 if (direction == DMA_OUT) { 142 map_dir = DMA_TO_DEVICE; 143 dma_dir = DMA_MODE_WRITE; 144 } else { 145 map_dir = DMA_FROM_DEVICE; 146 dma_dir = DMA_MODE_READ; 147 } 148 149 dma_map_sg(dev, info->sg, bufs, map_dir); 150 151 disable_dma(dmach); 152 set_dma_sg(dmach, info->sg, bufs); 153 set_dma_mode(dmach, dma_dir); 154 enable_dma(dmach); 155 return fasdma_real_all; 156 } 157 158 /* 159 * If we're not doing DMA, 160 * we'll do slow PIO 161 */ 162 return fasdma_pio; 163 } 164 165 /* Prototype: int powertecscsi_dma_stop(host, SCpnt) 166 * Purpose : stops DMA/PIO 167 * Params : host - host 168 * SCpnt - command 169 */ 170 static void 171 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) 172 { 173 struct powertec_info *info = (struct powertec_info *)host->hostdata; 174 if (info->info.scsi.dma != NO_DMA) 175 disable_dma(info->info.scsi.dma); 176 } 177 178 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host) 179 * Purpose : returns a descriptive string about this interface, 180 * Params : host - driver host structure to return info for. 181 * Returns : pointer to a static buffer containing null terminated string. 182 */ 183 const char *powertecscsi_info(struct Scsi_Host *host) 184 { 185 struct powertec_info *info = (struct powertec_info *)host->hostdata; 186 static char string[150]; 187 188 sprintf(string, "%s (%s) in slot %d v%s terminators o%s", 189 host->hostt->name, info->info.scsi.type, info->ec->slot_no, 190 VERSION, info->term_ctl ? "n" : "ff"); 191 192 return string; 193 } 194 195 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 196 * Purpose : Set a driver specific function 197 * Params : host - host to setup 198 * : buffer - buffer containing string describing operation 199 * : length - length of string 200 * Returns : -EINVAL, or 0 201 */ 202 static int 203 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length) 204 { 205 int ret = length; 206 207 if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) { 208 buffer += 12; 209 length -= 12; 210 211 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) { 212 if (buffer[5] == '1') 213 powertecscsi_terminator_ctl(host, 1); 214 else if (buffer[5] == '0') 215 powertecscsi_terminator_ctl(host, 0); 216 else 217 ret = -EINVAL; 218 } else 219 ret = -EINVAL; 220 } else 221 ret = -EINVAL; 222 223 return ret; 224 } 225 226 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset, 227 * int length, int host_no, int inout) 228 * Purpose : Return information about the driver to a user process accessing 229 * the /proc filesystem. 230 * Params : buffer - a buffer to write information to 231 * start - a pointer into this buffer set by this routine to the start 232 * of the required information. 233 * offset - offset into information that we have read up to. 234 * length - length of buffer 235 * inout - 0 for reading, 1 for writing. 236 * Returns : length of data written to buffer. 237 */ 238 static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host) 239 { 240 struct powertec_info *info; 241 242 info = (struct powertec_info *)host->hostdata; 243 244 seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION); 245 fas216_print_host(&info->info, m); 246 seq_printf(m, "Term : o%s\n", 247 info->term_ctl ? "n" : "ff"); 248 249 fas216_print_stats(&info->info, m); 250 fas216_print_devices(&info->info, m); 251 return 0; 252 } 253 254 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf) 255 { 256 struct expansion_card *ec = ECARD_DEV(dev); 257 struct Scsi_Host *host = ecard_get_drvdata(ec); 258 struct powertec_info *info = (struct powertec_info *)host->hostdata; 259 260 return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0); 261 } 262 263 static ssize_t 264 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len) 265 { 266 struct expansion_card *ec = ECARD_DEV(dev); 267 struct Scsi_Host *host = ecard_get_drvdata(ec); 268 269 if (len > 1) 270 powertecscsi_terminator_ctl(host, buf[0] != '0'); 271 272 return len; 273 } 274 275 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR, 276 powertecscsi_show_term, powertecscsi_store_term); 277 278 static struct scsi_host_template powertecscsi_template = { 279 .module = THIS_MODULE, 280 .show_info = powertecscsi_show_info, 281 .write_info = powertecscsi_set_proc_info, 282 .name = "PowerTec SCSI", 283 .info = powertecscsi_info, 284 .queuecommand = fas216_queue_command, 285 .eh_host_reset_handler = fas216_eh_host_reset, 286 .eh_bus_reset_handler = fas216_eh_bus_reset, 287 .eh_device_reset_handler = fas216_eh_device_reset, 288 .eh_abort_handler = fas216_eh_abort, 289 .cmd_size = sizeof(struct fas216_cmd_priv), 290 .can_queue = 8, 291 .this_id = 7, 292 .sg_tablesize = SG_MAX_SEGMENTS, 293 .dma_boundary = IOMD_DMA_BOUNDARY, 294 .cmd_per_lun = 2, 295 .proc_name = "powertec", 296 }; 297 298 static int powertecscsi_probe(struct expansion_card *ec, 299 const struct ecard_id *id) 300 { 301 struct Scsi_Host *host; 302 struct powertec_info *info; 303 void __iomem *base; 304 int ret; 305 306 ret = ecard_request_resources(ec); 307 if (ret) 308 goto out; 309 310 base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0); 311 if (!base) { 312 ret = -ENOMEM; 313 goto out_region; 314 } 315 316 host = scsi_host_alloc(&powertecscsi_template, 317 sizeof (struct powertec_info)); 318 if (!host) { 319 ret = -ENOMEM; 320 goto out_region; 321 } 322 323 ecard_set_drvdata(ec, host); 324 325 info = (struct powertec_info *)host->hostdata; 326 info->base = base; 327 powertecscsi_terminator_ctl(host, term[ec->slot_no]); 328 329 info->ec = ec; 330 info->info.scsi.io_base = base + POWERTEC_FAS216_OFFSET; 331 info->info.scsi.io_shift = POWERTEC_FAS216_SHIFT; 332 info->info.scsi.irq = ec->irq; 333 info->info.scsi.dma = ec->dma; 334 info->info.ifcfg.clockrate = 40; /* MHz */ 335 info->info.ifcfg.select_timeout = 255; 336 info->info.ifcfg.asyncperiod = 200; /* ns */ 337 info->info.ifcfg.sync_max_depth = 7; 338 info->info.ifcfg.cntl3 = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK; 339 info->info.ifcfg.disconnect_ok = 1; 340 info->info.ifcfg.wide_max_size = 0; 341 info->info.ifcfg.capabilities = 0; 342 info->info.dma.setup = powertecscsi_dma_setup; 343 info->info.dma.pseudo = NULL; 344 info->info.dma.stop = powertecscsi_dma_stop; 345 346 ec->irqaddr = base + POWERTEC_INTR_STATUS; 347 ec->irqmask = POWERTEC_INTR_BIT; 348 349 ecard_setirq(ec, &powertecscsi_ops, info); 350 351 device_create_file(&ec->dev, &dev_attr_bus_term); 352 353 ret = fas216_init(host); 354 if (ret) 355 goto out_free; 356 357 ret = request_irq(ec->irq, powertecscsi_intr, 358 0, "powertec", info); 359 if (ret) { 360 printk("scsi%d: IRQ%d not free: %d\n", 361 host->host_no, ec->irq, ret); 362 goto out_release; 363 } 364 365 if (info->info.scsi.dma != NO_DMA) { 366 if (request_dma(info->info.scsi.dma, "powertec")) { 367 printk("scsi%d: DMA%d not free, using PIO\n", 368 host->host_no, info->info.scsi.dma); 369 info->info.scsi.dma = NO_DMA; 370 } else { 371 set_dma_speed(info->info.scsi.dma, 180); 372 info->info.ifcfg.capabilities |= FASCAP_DMA; 373 } 374 } 375 376 ret = fas216_add(host, &ec->dev); 377 if (ret == 0) 378 goto out; 379 380 if (info->info.scsi.dma != NO_DMA) 381 free_dma(info->info.scsi.dma); 382 free_irq(ec->irq, info); 383 384 out_release: 385 fas216_release(host); 386 387 out_free: 388 device_remove_file(&ec->dev, &dev_attr_bus_term); 389 scsi_host_put(host); 390 391 out_region: 392 ecard_release_resources(ec); 393 394 out: 395 return ret; 396 } 397 398 static void powertecscsi_remove(struct expansion_card *ec) 399 { 400 struct Scsi_Host *host = ecard_get_drvdata(ec); 401 struct powertec_info *info = (struct powertec_info *)host->hostdata; 402 403 ecard_set_drvdata(ec, NULL); 404 fas216_remove(host); 405 406 device_remove_file(&ec->dev, &dev_attr_bus_term); 407 408 if (info->info.scsi.dma != NO_DMA) 409 free_dma(info->info.scsi.dma); 410 free_irq(ec->irq, info); 411 412 fas216_release(host); 413 scsi_host_put(host); 414 ecard_release_resources(ec); 415 } 416 417 static const struct ecard_id powertecscsi_cids[] = { 418 { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }, 419 { 0xffff, 0xffff }, 420 }; 421 422 static struct ecard_driver powertecscsi_driver = { 423 .probe = powertecscsi_probe, 424 .remove = powertecscsi_remove, 425 .id_table = powertecscsi_cids, 426 .drv = { 427 .name = "powertecscsi", 428 }, 429 }; 430 431 static int __init powertecscsi_init(void) 432 { 433 return ecard_register_driver(&powertecscsi_driver); 434 } 435 436 static void __exit powertecscsi_exit(void) 437 { 438 ecard_remove_driver(&powertecscsi_driver); 439 } 440 441 module_init(powertecscsi_init); 442 module_exit(powertecscsi_exit); 443 444 MODULE_AUTHOR("Russell King"); 445 MODULE_DESCRIPTION("Powertec SCSI driver"); 446 module_param_array(term, int, NULL, 0); 447 MODULE_PARM_DESC(term, "SCSI bus termination"); 448 MODULE_LICENSE("GPL"); 449