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