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