1 /* 2 * linux/drivers/scsi/arm/arxescsi.c 3 * 4 * Copyright (C) 1997-2000 Russell King, Stefan Hanske 5 * 6 * This driver is based on experimentation. Hence, it may have made 7 * assumptions about the particular card that I have available, and 8 * may not be reliable! 9 * 10 * Changelog: 11 * 30-08-1997 RMK 0.0.0 Created, READONLY version as cumana_2.c 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 * 11-06-1998 SH 0.0.2 Changed to support ARXE 16-bit SCSI card 15 * enabled writing 16 * 01-01-2000 SH 0.1.0 Added *real* pseudo dma writing 17 * (arxescsi_pseudo_dma_write) 18 * 02-04-2000 RMK 0.1.1 Updated for new error handling code. 19 * 22-10-2000 SH Updated for new registering scheme. 20 */ 21 #include <linux/module.h> 22 #include <linux/blkdev.h> 23 #include <linux/kernel.h> 24 #include <linux/string.h> 25 #include <linux/ioport.h> 26 #include <linux/proc_fs.h> 27 #include <linux/unistd.h> 28 #include <linux/stat.h> 29 #include <linux/delay.h> 30 #include <linux/init.h> 31 #include <linux/interrupt.h> 32 33 #include <asm/dma.h> 34 #include <asm/io.h> 35 #include <asm/ecard.h> 36 37 #include "../scsi.h" 38 #include <scsi/scsi_host.h> 39 #include "fas216.h" 40 41 struct arxescsi_info { 42 FAS216_Info info; 43 struct expansion_card *ec; 44 void __iomem *base; 45 }; 46 47 #define DMADATA_OFFSET (0x200) 48 49 #define DMASTAT_OFFSET (0x600) 50 #define DMASTAT_DRQ (1 << 0) 51 52 #define CSTATUS_IRQ (1 << 0) 53 54 #define VERSION "1.10 (23/01/2003 2.5.57)" 55 56 /* 57 * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type) 58 * Purpose : initialises DMA/PIO 59 * Params : host - host 60 * SCpnt - command 61 * direction - DMA on to/off of card 62 * min_type - minimum DMA support that we must have for this transfer 63 * Returns : 0 if we should not set CMD_WITHDMA for transfer info command 64 */ 65 static fasdmatype_t 66 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp, 67 fasdmadir_t direction, fasdmatype_t min_type) 68 { 69 /* 70 * We don't do real DMA 71 */ 72 return fasdma_pseudo; 73 } 74 75 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base) 76 { 77 __asm__ __volatile__( 78 " stmdb sp!, {r0-r12}\n" 79 " mov r3, %0\n" 80 " mov r1, %1\n" 81 " add r2, r1, #512\n" 82 " mov r4, #256\n" 83 ".loop_1: ldmia r3!, {r6, r8, r10, r12}\n" 84 " mov r5, r6, lsl #16\n" 85 " mov r7, r8, lsl #16\n" 86 ".loop_2: ldrb r0, [r1, #1536]\n" 87 " tst r0, #1\n" 88 " beq .loop_2\n" 89 " stmia r2, {r5-r8}\n\t" 90 " mov r9, r10, lsl #16\n" 91 " mov r11, r12, lsl #16\n" 92 ".loop_3: ldrb r0, [r1, #1536]\n" 93 " tst r0, #1\n" 94 " beq .loop_3\n" 95 " stmia r2, {r9-r12}\n" 96 " subs r4, r4, #16\n" 97 " bne .loop_1\n" 98 " ldmia sp!, {r0-r12}\n" 99 : 100 : "r" (addr), "r" (base)); 101 } 102 103 /* 104 * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer) 105 * Purpose : handles pseudo DMA 106 * Params : host - host 107 * SCpnt - command 108 * direction - DMA on to/off of card 109 * transfer - minimum number of bytes we expect to transfer 110 */ 111 static void 112 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp, 113 fasdmadir_t direction, int transfer) 114 { 115 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; 116 unsigned int length, error = 0; 117 void __iomem *base = info->info.scsi.io_base; 118 unsigned char *addr; 119 120 length = SCp->this_residual; 121 addr = SCp->ptr; 122 123 if (direction == DMA_OUT) { 124 unsigned int word; 125 while (length > 256) { 126 if (readb(base + 0x80) & STAT_INT) { 127 error = 1; 128 break; 129 } 130 arxescsi_pseudo_dma_write(addr, base); 131 addr += 256; 132 length -= 256; 133 } 134 135 if (!error) 136 while (length > 0) { 137 if (readb(base + 0x80) & STAT_INT) 138 break; 139 140 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) 141 continue; 142 143 word = *addr | *(addr + 1) << 8; 144 145 writew(word, base + DMADATA_OFFSET); 146 if (length > 1) { 147 addr += 2; 148 length -= 2; 149 } else { 150 addr += 1; 151 length -= 1; 152 } 153 } 154 } 155 else { 156 if (transfer && (transfer & 255)) { 157 while (length >= 256) { 158 if (readb(base + 0x80) & STAT_INT) { 159 error = 1; 160 break; 161 } 162 163 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) 164 continue; 165 166 readsw(base + DMADATA_OFFSET, addr, 256 >> 1); 167 addr += 256; 168 length -= 256; 169 } 170 } 171 172 if (!(error)) 173 while (length > 0) { 174 unsigned long word; 175 176 if (readb(base + 0x80) & STAT_INT) 177 break; 178 179 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ)) 180 continue; 181 182 word = readw(base + DMADATA_OFFSET); 183 *addr++ = word; 184 if (--length > 0) { 185 *addr++ = word >> 8; 186 length --; 187 } 188 } 189 } 190 } 191 192 /* 193 * Function: int arxescsi_dma_stop(host, SCpnt) 194 * Purpose : stops DMA/PIO 195 * Params : host - host 196 * SCpnt - command 197 */ 198 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp) 199 { 200 /* 201 * no DMA to stop 202 */ 203 } 204 205 /* 206 * Function: const char *arxescsi_info(struct Scsi_Host * host) 207 * Purpose : returns a descriptive string about this interface, 208 * Params : host - driver host structure to return info for. 209 * Returns : pointer to a static buffer containing null terminated string. 210 */ 211 static const char *arxescsi_info(struct Scsi_Host *host) 212 { 213 struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata; 214 static char string[150]; 215 216 sprintf(string, "%s (%s) in slot %d v%s", 217 host->hostt->name, info->info.scsi.type, info->ec->slot_no, 218 VERSION); 219 220 return string; 221 } 222 223 /* 224 * Function: int arxescsi_proc_info(char *buffer, char **start, off_t offset, 225 * int length, int host_no, int inout) 226 * Purpose : Return information about the driver to a user process accessing 227 * the /proc filesystem. 228 * Params : buffer - a buffer to write information to 229 * start - a pointer into this buffer set by this routine to the start 230 * of the required information. 231 * offset - offset into information that we have read up to. 232 * length - length of buffer 233 * host_no - host number to return information for 234 * inout - 0 for reading, 1 for writing. 235 * Returns : length of data written to buffer. 236 */ 237 static int 238 arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length, 239 int inout) 240 { 241 struct arxescsi_info *info; 242 char *p = buffer; 243 int pos; 244 245 info = (struct arxescsi_info *)host->hostdata; 246 if (inout == 1) 247 return -EINVAL; 248 249 p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION); 250 p += fas216_print_host(&info->info, p); 251 p += fas216_print_stats(&info->info, p); 252 p += fas216_print_devices(&info->info, p); 253 254 *start = buffer + offset; 255 pos = p - buffer - offset; 256 if (pos > length) 257 pos = length; 258 259 return pos; 260 } 261 262 static struct scsi_host_template arxescsi_template = { 263 .proc_info = arxescsi_proc_info, 264 .name = "ARXE SCSI card", 265 .info = arxescsi_info, 266 .queuecommand = fas216_noqueue_command, 267 .eh_host_reset_handler = fas216_eh_host_reset, 268 .eh_bus_reset_handler = fas216_eh_bus_reset, 269 .eh_device_reset_handler = fas216_eh_device_reset, 270 .eh_abort_handler = fas216_eh_abort, 271 .can_queue = 0, 272 .this_id = 7, 273 .sg_tablesize = SG_ALL, 274 .cmd_per_lun = 1, 275 .use_clustering = DISABLE_CLUSTERING, 276 .proc_name = "arxescsi", 277 }; 278 279 static int __devinit 280 arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id) 281 { 282 struct Scsi_Host *host; 283 struct arxescsi_info *info; 284 void __iomem *base; 285 int ret; 286 287 ret = ecard_request_resources(ec); 288 if (ret) 289 goto out; 290 291 base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0); 292 if (!base) { 293 ret = -ENOMEM; 294 goto out_region; 295 } 296 297 host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info)); 298 if (!host) { 299 ret = -ENOMEM; 300 goto out_region; 301 } 302 303 info = (struct arxescsi_info *)host->hostdata; 304 info->ec = ec; 305 info->base = base; 306 307 info->info.scsi.io_base = base + 0x2000; 308 info->info.scsi.irq = 0; 309 info->info.scsi.dma = NO_DMA; 310 info->info.scsi.io_shift = 5; 311 info->info.ifcfg.clockrate = 24; /* MHz */ 312 info->info.ifcfg.select_timeout = 255; 313 info->info.ifcfg.asyncperiod = 200; /* ns */ 314 info->info.ifcfg.sync_max_depth = 0; 315 info->info.ifcfg.cntl3 = CNTL3_FASTSCSI | CNTL3_FASTCLK; 316 info->info.ifcfg.disconnect_ok = 0; 317 info->info.ifcfg.wide_max_size = 0; 318 info->info.ifcfg.capabilities = FASCAP_PSEUDODMA; 319 info->info.dma.setup = arxescsi_dma_setup; 320 info->info.dma.pseudo = arxescsi_dma_pseudo; 321 info->info.dma.stop = arxescsi_dma_stop; 322 323 ec->irqaddr = base; 324 ec->irqmask = CSTATUS_IRQ; 325 326 ret = fas216_init(host); 327 if (ret) 328 goto out_unregister; 329 330 ret = fas216_add(host, &ec->dev); 331 if (ret == 0) 332 goto out; 333 334 fas216_release(host); 335 out_unregister: 336 scsi_host_put(host); 337 out_region: 338 ecard_release_resources(ec); 339 out: 340 return ret; 341 } 342 343 static void __devexit arxescsi_remove(struct expansion_card *ec) 344 { 345 struct Scsi_Host *host = ecard_get_drvdata(ec); 346 347 ecard_set_drvdata(ec, NULL); 348 fas216_remove(host); 349 350 fas216_release(host); 351 scsi_host_put(host); 352 ecard_release_resources(ec); 353 } 354 355 static const struct ecard_id arxescsi_cids[] = { 356 { MANU_ARXE, PROD_ARXE_SCSI }, 357 { 0xffff, 0xffff }, 358 }; 359 360 static struct ecard_driver arxescsi_driver = { 361 .probe = arxescsi_probe, 362 .remove = __devexit_p(arxescsi_remove), 363 .id_table = arxescsi_cids, 364 .drv = { 365 .name = "arxescsi", 366 }, 367 }; 368 369 static int __init init_arxe_scsi_driver(void) 370 { 371 return ecard_register_driver(&arxescsi_driver); 372 } 373 374 static void __exit exit_arxe_scsi_driver(void) 375 { 376 ecard_remove_driver(&arxescsi_driver); 377 } 378 379 module_init(init_arxe_scsi_driver); 380 module_exit(exit_arxe_scsi_driver); 381 382 MODULE_AUTHOR("Stefan Hanske"); 383 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines"); 384 MODULE_LICENSE("GPL"); 385 386