1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/types.h> 3 #include <linux/init.h> 4 #include <linux/interrupt.h> 5 #include <linux/mm.h> 6 #include <linux/slab.h> 7 #include <linux/spinlock.h> 8 #include <linux/zorro.h> 9 #include <linux/module.h> 10 11 #include <asm/page.h> 12 #include <asm/amigaints.h> 13 #include <asm/amigahw.h> 14 15 #include <scsi/scsi.h> 16 #include <scsi/scsi_cmnd.h> 17 #include <scsi/scsi_device.h> 18 #include <scsi/scsi_eh.h> 19 #include <scsi/scsi_tcq.h> 20 #include "wd33c93.h" 21 #include "gvp11.h" 22 23 24 #define CHECK_WD33C93 25 26 struct gvp11_hostdata { 27 struct WD33C93_hostdata wh; 28 struct gvp11_scsiregs *regs; 29 struct device *dev; 30 }; 31 32 #define DMA_DIR(d) ((d == DATA_OUT_DIR) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 33 #define TO_DMA_MASK(m) (~((unsigned long long)m & 0xffffffff)) 34 35 static irqreturn_t gvp11_intr(int irq, void *data) 36 { 37 struct Scsi_Host *instance = data; 38 struct gvp11_hostdata *hdata = shost_priv(instance); 39 unsigned int status = hdata->regs->CNTR; 40 unsigned long flags; 41 42 if (!(status & GVP11_DMAC_INT_PENDING)) 43 return IRQ_NONE; 44 45 spin_lock_irqsave(instance->host_lock, flags); 46 wd33c93_intr(instance); 47 spin_unlock_irqrestore(instance->host_lock, flags); 48 return IRQ_HANDLED; 49 } 50 51 static int gvp11_xfer_mask = 0; 52 53 void gvp11_setup(char *str, int *ints) 54 { 55 gvp11_xfer_mask = ints[1]; 56 } 57 58 static int dma_setup(struct scsi_cmnd *cmd, int dir_in) 59 { 60 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(cmd); 61 unsigned long len = scsi_pointer->this_residual; 62 struct Scsi_Host *instance = cmd->device->host; 63 struct gvp11_hostdata *hdata = shost_priv(instance); 64 struct WD33C93_hostdata *wh = &hdata->wh; 65 struct gvp11_scsiregs *regs = hdata->regs; 66 unsigned short cntr = GVP11_DMAC_INT_ENABLE; 67 dma_addr_t addr; 68 int bank_mask; 69 static int scsi_alloc_out_of_range = 0; 70 71 addr = dma_map_single(hdata->dev, scsi_pointer->ptr, 72 len, DMA_DIR(dir_in)); 73 if (dma_mapping_error(hdata->dev, addr)) { 74 dev_warn(hdata->dev, "cannot map SCSI data block %p\n", 75 scsi_pointer->ptr); 76 return 1; 77 } 78 scsi_pointer->dma_handle = addr; 79 80 /* use bounce buffer if the physical address is bad */ 81 if (addr & wh->dma_xfer_mask) { 82 /* drop useless mapping */ 83 dma_unmap_single(hdata->dev, scsi_pointer->dma_handle, 84 scsi_pointer->this_residual, 85 DMA_DIR(dir_in)); 86 scsi_pointer->dma_handle = (dma_addr_t) NULL; 87 88 wh->dma_bounce_len = (scsi_pointer->this_residual + 511) & ~0x1ff; 89 90 if (!scsi_alloc_out_of_range) { 91 wh->dma_bounce_buffer = 92 kmalloc(wh->dma_bounce_len, GFP_KERNEL); 93 wh->dma_buffer_pool = BUF_SCSI_ALLOCED; 94 } 95 96 if (scsi_alloc_out_of_range || 97 !wh->dma_bounce_buffer) { 98 wh->dma_bounce_buffer = 99 amiga_chip_alloc(wh->dma_bounce_len, 100 "GVP II SCSI Bounce Buffer"); 101 102 if (!wh->dma_bounce_buffer) { 103 wh->dma_bounce_len = 0; 104 return 1; 105 } 106 107 wh->dma_buffer_pool = BUF_CHIP_ALLOCED; 108 } 109 110 if (!dir_in) { 111 /* copy to bounce buffer for a write */ 112 memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr, 113 scsi_pointer->this_residual); 114 } 115 116 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) { 117 /* will flush/invalidate cache for us */ 118 addr = dma_map_single(hdata->dev, 119 wh->dma_bounce_buffer, 120 wh->dma_bounce_len, 121 DMA_DIR(dir_in)); 122 /* can't map buffer; use PIO */ 123 if (dma_mapping_error(hdata->dev, addr)) { 124 dev_warn(hdata->dev, 125 "cannot map bounce buffer %p\n", 126 wh->dma_bounce_buffer); 127 return 1; 128 } 129 } 130 131 if (addr & wh->dma_xfer_mask) { 132 /* drop useless mapping */ 133 dma_unmap_single(hdata->dev, scsi_pointer->dma_handle, 134 scsi_pointer->this_residual, 135 DMA_DIR(dir_in)); 136 /* fall back to Chip RAM if address out of range */ 137 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) { 138 kfree(wh->dma_bounce_buffer); 139 scsi_alloc_out_of_range = 1; 140 } else { 141 amiga_chip_free(wh->dma_bounce_buffer); 142 } 143 144 wh->dma_bounce_buffer = 145 amiga_chip_alloc(wh->dma_bounce_len, 146 "GVP II SCSI Bounce Buffer"); 147 148 if (!wh->dma_bounce_buffer) { 149 wh->dma_bounce_len = 0; 150 return 1; 151 } 152 153 if (!dir_in) { 154 /* copy to bounce buffer for a write */ 155 memcpy(wh->dma_bounce_buffer, scsi_pointer->ptr, 156 scsi_pointer->this_residual); 157 } 158 /* chip RAM can be mapped to phys. address directly */ 159 addr = virt_to_phys(wh->dma_bounce_buffer); 160 /* no need to flush/invalidate cache */ 161 wh->dma_buffer_pool = BUF_CHIP_ALLOCED; 162 } 163 /* finally, have OK mapping (punted for PIO else) */ 164 scsi_pointer->dma_handle = addr; 165 166 } 167 168 /* setup dma direction */ 169 if (!dir_in) 170 cntr |= GVP11_DMAC_DIR_WRITE; 171 172 wh->dma_dir = dir_in; 173 regs->CNTR = cntr; 174 175 /* setup DMA *physical* address */ 176 regs->ACR = addr; 177 178 /* no more cache flush here - dma_map_single() takes care */ 179 180 bank_mask = (~wh->dma_xfer_mask >> 18) & 0x01c0; 181 if (bank_mask) 182 regs->BANK = bank_mask & (addr >> 18); 183 184 /* start DMA */ 185 regs->ST_DMA = 1; 186 187 /* return success */ 188 return 0; 189 } 190 191 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt, 192 int status) 193 { 194 struct scsi_pointer *scsi_pointer = WD33C93_scsi_pointer(SCpnt); 195 struct gvp11_hostdata *hdata = shost_priv(instance); 196 struct WD33C93_hostdata *wh = &hdata->wh; 197 struct gvp11_scsiregs *regs = hdata->regs; 198 199 /* stop DMA */ 200 regs->SP_DMA = 1; 201 /* remove write bit from CONTROL bits */ 202 regs->CNTR = GVP11_DMAC_INT_ENABLE; 203 204 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) 205 dma_unmap_single(hdata->dev, scsi_pointer->dma_handle, 206 scsi_pointer->this_residual, 207 DMA_DIR(wh->dma_dir)); 208 209 /* copy from a bounce buffer, if necessary */ 210 if (status && wh->dma_bounce_buffer) { 211 if (wh->dma_dir && SCpnt) 212 memcpy(scsi_pointer->ptr, wh->dma_bounce_buffer, 213 scsi_pointer->this_residual); 214 215 if (wh->dma_buffer_pool == BUF_SCSI_ALLOCED) 216 kfree(wh->dma_bounce_buffer); 217 else 218 amiga_chip_free(wh->dma_bounce_buffer); 219 220 wh->dma_bounce_buffer = NULL; 221 wh->dma_bounce_len = 0; 222 } 223 } 224 225 static const struct scsi_host_template gvp11_scsi_template = { 226 .module = THIS_MODULE, 227 .name = "GVP Series II SCSI", 228 .show_info = wd33c93_show_info, 229 .write_info = wd33c93_write_info, 230 .proc_name = "GVP11", 231 .queuecommand = wd33c93_queuecommand, 232 .eh_abort_handler = wd33c93_abort, 233 .eh_host_reset_handler = wd33c93_host_reset, 234 .can_queue = CAN_QUEUE, 235 .this_id = 7, 236 .sg_tablesize = SG_ALL, 237 .cmd_per_lun = CMD_PER_LUN, 238 .dma_boundary = PAGE_SIZE - 1, 239 .cmd_size = sizeof(struct scsi_pointer), 240 }; 241 242 static int check_wd33c93(struct gvp11_scsiregs *regs) 243 { 244 #ifdef CHECK_WD33C93 245 volatile unsigned char *sasr_3393, *scmd_3393; 246 unsigned char save_sasr; 247 unsigned char q, qq; 248 249 /* 250 * These darn GVP boards are a problem - it can be tough to tell 251 * whether or not they include a SCSI controller. This is the 252 * ultimate Yet-Another-GVP-Detection-Hack in that it actually 253 * probes for a WD33c93 chip: If we find one, it's extremely 254 * likely that this card supports SCSI, regardless of Product_ 255 * Code, Board_Size, etc. 256 */ 257 258 /* Get pointers to the presumed register locations and save contents */ 259 260 sasr_3393 = ®s->SASR; 261 scmd_3393 = ®s->SCMD; 262 save_sasr = *sasr_3393; 263 264 /* First test the AuxStatus Reg */ 265 266 q = *sasr_3393; /* read it */ 267 if (q & 0x08) /* bit 3 should always be clear */ 268 return -ENODEV; 269 *sasr_3393 = WD_AUXILIARY_STATUS; /* setup indirect address */ 270 if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */ 271 *sasr_3393 = save_sasr; /* Oops - restore this byte */ 272 return -ENODEV; 273 } 274 if (*sasr_3393 != q) { /* should still read the same */ 275 *sasr_3393 = save_sasr; /* Oops - restore this byte */ 276 return -ENODEV; 277 } 278 if (*scmd_3393 != q) /* and so should the image at 0x1f */ 279 return -ENODEV; 280 281 /* 282 * Ok, we probably have a wd33c93, but let's check a few other places 283 * for good measure. Make sure that this works for both 'A and 'B 284 * chip versions. 285 */ 286 287 *sasr_3393 = WD_SCSI_STATUS; 288 q = *scmd_3393; 289 *sasr_3393 = WD_SCSI_STATUS; 290 *scmd_3393 = ~q; 291 *sasr_3393 = WD_SCSI_STATUS; 292 qq = *scmd_3393; 293 *sasr_3393 = WD_SCSI_STATUS; 294 *scmd_3393 = q; 295 if (qq != q) /* should be read only */ 296 return -ENODEV; 297 *sasr_3393 = 0x1e; /* this register is unimplemented */ 298 q = *scmd_3393; 299 *sasr_3393 = 0x1e; 300 *scmd_3393 = ~q; 301 *sasr_3393 = 0x1e; 302 qq = *scmd_3393; 303 *sasr_3393 = 0x1e; 304 *scmd_3393 = q; 305 if (qq != q || qq != 0xff) /* should be read only, all 1's */ 306 return -ENODEV; 307 *sasr_3393 = WD_TIMEOUT_PERIOD; 308 q = *scmd_3393; 309 *sasr_3393 = WD_TIMEOUT_PERIOD; 310 *scmd_3393 = ~q; 311 *sasr_3393 = WD_TIMEOUT_PERIOD; 312 qq = *scmd_3393; 313 *sasr_3393 = WD_TIMEOUT_PERIOD; 314 *scmd_3393 = q; 315 if (qq != (~q & 0xff)) /* should be read/write */ 316 return -ENODEV; 317 #endif /* CHECK_WD33C93 */ 318 319 return 0; 320 } 321 322 static int gvp11_probe(struct zorro_dev *z, const struct zorro_device_id *ent) 323 { 324 struct Scsi_Host *instance; 325 unsigned long address; 326 int error; 327 unsigned int epc; 328 unsigned int default_dma_xfer_mask; 329 struct gvp11_hostdata *hdata; 330 struct gvp11_scsiregs *regs; 331 wd33c93_regs wdregs; 332 333 default_dma_xfer_mask = ent->driver_data; 334 335 if (dma_set_mask_and_coherent(&z->dev, 336 TO_DMA_MASK(default_dma_xfer_mask))) { 337 dev_warn(&z->dev, "cannot use DMA mask %llx\n", 338 TO_DMA_MASK(default_dma_xfer_mask)); 339 return -ENODEV; 340 } 341 342 /* 343 * Rumors state that some GVP ram boards use the same product 344 * code as the SCSI controllers. Therefore if the board-size 345 * is not 64KB we assume it is a ram board and bail out. 346 */ 347 if (zorro_resource_len(z) != 0x10000) 348 return -ENODEV; 349 350 address = z->resource.start; 351 if (!request_mem_region(address, 256, "wd33c93")) 352 return -EBUSY; 353 354 regs = ZTWO_VADDR(address); 355 356 error = check_wd33c93(regs); 357 if (error) 358 goto fail_check_or_alloc; 359 360 instance = scsi_host_alloc(&gvp11_scsi_template, 361 sizeof(struct gvp11_hostdata)); 362 if (!instance) { 363 error = -ENOMEM; 364 goto fail_check_or_alloc; 365 } 366 367 instance->irq = IRQ_AMIGA_PORTS; 368 instance->unique_id = z->slotaddr; 369 370 regs->secret2 = 1; 371 regs->secret1 = 0; 372 regs->secret3 = 15; 373 while (regs->CNTR & GVP11_DMAC_BUSY) 374 ; 375 regs->CNTR = 0; 376 regs->BANK = 0; 377 378 wdregs.SASR = ®s->SASR; 379 wdregs.SCMD = ®s->SCMD; 380 381 hdata = shost_priv(instance); 382 if (gvp11_xfer_mask) { 383 hdata->wh.dma_xfer_mask = gvp11_xfer_mask; 384 if (dma_set_mask_and_coherent(&z->dev, 385 TO_DMA_MASK(gvp11_xfer_mask))) { 386 dev_warn(&z->dev, "cannot use DMA mask %llx\n", 387 TO_DMA_MASK(gvp11_xfer_mask)); 388 error = -ENODEV; 389 goto fail_check_or_alloc; 390 } 391 } else 392 hdata->wh.dma_xfer_mask = default_dma_xfer_mask; 393 394 hdata->wh.no_sync = 0xff; 395 hdata->wh.fast = 0; 396 hdata->wh.dma_mode = CTRL_DMA; 397 hdata->regs = regs; 398 399 /* 400 * Check for 14MHz SCSI clock 401 */ 402 epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000); 403 wd33c93_init(instance, wdregs, dma_setup, dma_stop, 404 (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10 405 : WD33C93_FS_12_15); 406 407 error = request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, 408 "GVP11 SCSI", instance); 409 if (error) 410 goto fail_irq; 411 412 regs->CNTR = GVP11_DMAC_INT_ENABLE; 413 414 error = scsi_add_host(instance, NULL); 415 if (error) 416 goto fail_host; 417 418 zorro_set_drvdata(z, instance); 419 scsi_scan_host(instance); 420 return 0; 421 422 fail_host: 423 free_irq(IRQ_AMIGA_PORTS, instance); 424 fail_irq: 425 scsi_host_put(instance); 426 fail_check_or_alloc: 427 release_mem_region(address, 256); 428 return error; 429 } 430 431 static void gvp11_remove(struct zorro_dev *z) 432 { 433 struct Scsi_Host *instance = zorro_get_drvdata(z); 434 struct gvp11_hostdata *hdata = shost_priv(instance); 435 436 hdata->regs->CNTR = 0; 437 scsi_remove_host(instance); 438 free_irq(IRQ_AMIGA_PORTS, instance); 439 scsi_host_put(instance); 440 release_mem_region(z->resource.start, 256); 441 } 442 443 /* 444 * This should (hopefully) be the correct way to identify 445 * all the different GVP SCSI controllers (except for the 446 * SERIES I though). 447 */ 448 449 static struct zorro_device_id gvp11_zorro_tbl[] = { 450 { ZORRO_PROD_GVP_COMBO_030_R3_SCSI, ~0x00ffffff }, 451 { ZORRO_PROD_GVP_SERIES_II, ~0x00ffffff }, 452 { ZORRO_PROD_GVP_GFORCE_030_SCSI, ~0x01ffffff }, 453 { ZORRO_PROD_GVP_A530_SCSI, ~0x01ffffff }, 454 { ZORRO_PROD_GVP_COMBO_030_R4_SCSI, ~0x01ffffff }, 455 { ZORRO_PROD_GVP_A1291, ~0x07ffffff }, 456 { ZORRO_PROD_GVP_GFORCE_040_SCSI_1, ~0x07ffffff }, 457 { 0 } 458 }; 459 MODULE_DEVICE_TABLE(zorro, gvp11_zorro_tbl); 460 461 static struct zorro_driver gvp11_driver = { 462 .name = "gvp11", 463 .id_table = gvp11_zorro_tbl, 464 .probe = gvp11_probe, 465 .remove = gvp11_remove, 466 }; 467 468 static int __init gvp11_init(void) 469 { 470 return zorro_register_driver(&gvp11_driver); 471 } 472 module_init(gvp11_init); 473 474 static void __exit gvp11_exit(void) 475 { 476 zorro_unregister_driver(&gvp11_driver); 477 } 478 module_exit(gvp11_exit); 479 480 MODULE_DESCRIPTION("GVP Series II SCSI"); 481 MODULE_LICENSE("GPL"); 482