1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Generic Macintosh NCR5380 driver 4 * 5 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov> 6 * 7 * Copyright 2019 Finn Thain 8 * 9 * derived in part from: 10 */ 11 /* 12 * Generic Generic NCR5380 driver 13 * 14 * Copyright 1995, Russell King 15 */ 16 17 #include <linux/delay.h> 18 #include <linux/types.h> 19 #include <linux/module.h> 20 #include <linux/ioport.h> 21 #include <linux/init.h> 22 #include <linux/blkdev.h> 23 #include <linux/interrupt.h> 24 #include <linux/platform_device.h> 25 26 #include <asm/hwtest.h> 27 #include <asm/io.h> 28 #include <asm/macintosh.h> 29 #include <asm/macints.h> 30 #include <asm/setup.h> 31 32 #include <scsi/scsi_host.h> 33 34 /* Definitions for the core NCR5380 driver. */ 35 36 #define NCR5380_implementation_fields int pdma_residual 37 38 #define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4)) 39 #define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value) 40 41 #define NCR5380_dma_xfer_len macscsi_dma_xfer_len 42 #define NCR5380_dma_recv_setup macscsi_pread 43 #define NCR5380_dma_send_setup macscsi_pwrite 44 #define NCR5380_dma_residual macscsi_dma_residual 45 46 #define NCR5380_intr macscsi_intr 47 #define NCR5380_queue_command macscsi_queue_command 48 #define NCR5380_abort macscsi_abort 49 #define NCR5380_host_reset macscsi_host_reset 50 #define NCR5380_info macscsi_info 51 52 #include "NCR5380.h" 53 54 static int setup_can_queue = -1; 55 module_param(setup_can_queue, int, 0); 56 static int setup_cmd_per_lun = -1; 57 module_param(setup_cmd_per_lun, int, 0); 58 static int setup_sg_tablesize = -1; 59 module_param(setup_sg_tablesize, int, 0); 60 static int setup_use_pdma = 512; 61 module_param(setup_use_pdma, int, 0); 62 static int setup_hostid = -1; 63 module_param(setup_hostid, int, 0); 64 static int setup_toshiba_delay = -1; 65 module_param(setup_toshiba_delay, int, 0); 66 67 #ifndef MODULE 68 static int __init mac_scsi_setup(char *str) 69 { 70 int ints[8]; 71 72 (void)get_options(str, ARRAY_SIZE(ints), ints); 73 74 if (ints[0] < 1) { 75 pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n"); 76 return 0; 77 } 78 if (ints[0] >= 1) 79 setup_can_queue = ints[1]; 80 if (ints[0] >= 2) 81 setup_cmd_per_lun = ints[2]; 82 if (ints[0] >= 3) 83 setup_sg_tablesize = ints[3]; 84 if (ints[0] >= 4) 85 setup_hostid = ints[4]; 86 /* ints[5] (use_tagged_queuing) is ignored */ 87 if (ints[0] >= 6) 88 setup_use_pdma = ints[6]; 89 if (ints[0] >= 7) 90 setup_toshiba_delay = ints[7]; 91 return 1; 92 } 93 94 __setup("mac5380=", mac_scsi_setup); 95 #endif /* !MODULE */ 96 97 /* 98 * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to 99 * specify the number of bytes between the delays expected from a SCSI target. 100 * This allows the operating system to "prevent bus errors when a target fails 101 * to deliver the next byte within the processor bus error timeout period." 102 * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets 103 * so bus errors are unavoidable. 104 * 105 * If a MOVE.B instruction faults, we assume that zero bytes were transferred 106 * and simply retry. That assumption probably depends on target behaviour but 107 * seems to hold up okay. The NOP provides synchronization: without it the 108 * fault can sometimes occur after the program counter has moved past the 109 * offending instruction. Post-increment addressing can't be used. 110 */ 111 112 #define MOVE_BYTE(operands) \ 113 asm volatile ( \ 114 "1: moveb " operands " \n" \ 115 "11: nop \n" \ 116 " addq #1,%0 \n" \ 117 " subq #1,%1 \n" \ 118 "40: \n" \ 119 " \n" \ 120 ".section .fixup,\"ax\" \n" \ 121 ".even \n" \ 122 "90: movel #1, %2 \n" \ 123 " jra 40b \n" \ 124 ".previous \n" \ 125 " \n" \ 126 ".section __ex_table,\"a\" \n" \ 127 ".align 4 \n" \ 128 ".long 1b,90b \n" \ 129 ".long 11b,90b \n" \ 130 ".previous \n" \ 131 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io)) 132 133 /* 134 * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because 135 * the residual byte count would be uncertain. In that situation the MOVE_WORD 136 * macro clears n in the fixup section to abort the transfer. 137 */ 138 139 #define MOVE_WORD(operands) \ 140 asm volatile ( \ 141 "1: movew " operands " \n" \ 142 "11: nop \n" \ 143 " subq #2,%1 \n" \ 144 "40: \n" \ 145 " \n" \ 146 ".section .fixup,\"ax\" \n" \ 147 ".even \n" \ 148 "90: movel #0, %1 \n" \ 149 " movel #2, %2 \n" \ 150 " jra 40b \n" \ 151 ".previous \n" \ 152 " \n" \ 153 ".section __ex_table,\"a\" \n" \ 154 ".align 4 \n" \ 155 ".long 1b,90b \n" \ 156 ".long 11b,90b \n" \ 157 ".previous \n" \ 158 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io)) 159 160 #define MOVE_16_WORDS(operands) \ 161 asm volatile ( \ 162 "1: movew " operands " \n" \ 163 "2: movew " operands " \n" \ 164 "3: movew " operands " \n" \ 165 "4: movew " operands " \n" \ 166 "5: movew " operands " \n" \ 167 "6: movew " operands " \n" \ 168 "7: movew " operands " \n" \ 169 "8: movew " operands " \n" \ 170 "9: movew " operands " \n" \ 171 "10: movew " operands " \n" \ 172 "11: movew " operands " \n" \ 173 "12: movew " operands " \n" \ 174 "13: movew " operands " \n" \ 175 "14: movew " operands " \n" \ 176 "15: movew " operands " \n" \ 177 "16: movew " operands " \n" \ 178 "17: nop \n" \ 179 " subl #32,%1 \n" \ 180 "40: \n" \ 181 " \n" \ 182 ".section .fixup,\"ax\" \n" \ 183 ".even \n" \ 184 "90: movel #0, %1 \n" \ 185 " movel #2, %2 \n" \ 186 " jra 40b \n" \ 187 ".previous \n" \ 188 " \n" \ 189 ".section __ex_table,\"a\" \n" \ 190 ".align 4 \n" \ 191 ".long 1b,90b \n" \ 192 ".long 2b,90b \n" \ 193 ".long 3b,90b \n" \ 194 ".long 4b,90b \n" \ 195 ".long 5b,90b \n" \ 196 ".long 6b,90b \n" \ 197 ".long 7b,90b \n" \ 198 ".long 8b,90b \n" \ 199 ".long 9b,90b \n" \ 200 ".long 10b,90b \n" \ 201 ".long 11b,90b \n" \ 202 ".long 12b,90b \n" \ 203 ".long 13b,90b \n" \ 204 ".long 14b,90b \n" \ 205 ".long 15b,90b \n" \ 206 ".long 16b,90b \n" \ 207 ".long 17b,90b \n" \ 208 ".previous \n" \ 209 : "+a" (addr), "+r" (n), "+r" (result) : "a" (io)) 210 211 #define MAC_PDMA_DELAY 32 212 213 static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n) 214 { 215 unsigned char *addr = start; 216 int result = 0; 217 218 if (n >= 1) { 219 MOVE_BYTE("%3@,%0@"); 220 if (result) 221 goto out; 222 } 223 if (n >= 1 && ((unsigned long)addr & 1)) { 224 MOVE_BYTE("%3@,%0@"); 225 if (result) 226 goto out; 227 } 228 while (n >= 32) 229 MOVE_16_WORDS("%3@,%0@+"); 230 while (n >= 2) 231 MOVE_WORD("%3@,%0@+"); 232 if (result) 233 return start - addr; /* Negated to indicate uncertain length */ 234 if (n == 1) 235 MOVE_BYTE("%3@,%0@"); 236 out: 237 return addr - start; 238 } 239 240 static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n) 241 { 242 unsigned char *addr = start; 243 int result = 0; 244 245 if (n >= 1) { 246 MOVE_BYTE("%0@,%3@"); 247 if (result) 248 goto out; 249 } 250 if (n >= 1 && ((unsigned long)addr & 1)) { 251 MOVE_BYTE("%0@,%3@"); 252 if (result) 253 goto out; 254 } 255 while (n >= 32) 256 MOVE_16_WORDS("%0@+,%3@"); 257 while (n >= 2) 258 MOVE_WORD("%0@+,%3@"); 259 if (result) 260 return start - addr; /* Negated to indicate uncertain length */ 261 if (n == 1) 262 MOVE_BYTE("%0@,%3@"); 263 out: 264 return addr - start; 265 } 266 267 /* The "SCSI DMA" chip on the IIfx implements this register. */ 268 #define CTRL_REG 0x8 269 #define CTRL_INTERRUPTS_ENABLE BIT(1) 270 #define CTRL_HANDSHAKE_MODE BIT(3) 271 272 static inline void write_ctrl_reg(struct NCR5380_hostdata *hostdata, u32 value) 273 { 274 out_be32(hostdata->io + (CTRL_REG << 4), value); 275 } 276 277 static inline int macscsi_pread(struct NCR5380_hostdata *hostdata, 278 unsigned char *dst, int len) 279 { 280 u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4); 281 unsigned char *d = dst; 282 int result = 0; 283 284 hostdata->pdma_residual = len; 285 286 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, 287 BASR_DRQ | BASR_PHASE_MATCH, 288 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 289 int bytes; 290 291 if (macintosh_config->ident == MAC_MODEL_IIFX) 292 write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE | 293 CTRL_INTERRUPTS_ENABLE); 294 295 bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512)); 296 297 if (bytes > 0) { 298 d += bytes; 299 hostdata->pdma_residual -= bytes; 300 } 301 302 if (hostdata->pdma_residual == 0) 303 goto out; 304 305 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ, 306 BUS_AND_STATUS_REG, BASR_ACK, 307 BASR_ACK, HZ / 64) < 0) 308 scmd_printk(KERN_DEBUG, hostdata->connected, 309 "%s: !REQ and !ACK\n", __func__); 310 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 311 goto out; 312 313 if (bytes == 0) 314 udelay(MAC_PDMA_DELAY); 315 316 if (bytes >= 0) 317 continue; 318 319 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, 320 "%s: bus error (%d/%d)\n", __func__, d - dst, len); 321 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 322 result = -1; 323 goto out; 324 } 325 326 scmd_printk(KERN_ERR, hostdata->connected, 327 "%s: phase mismatch or !DRQ\n", __func__); 328 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 329 result = -1; 330 out: 331 if (macintosh_config->ident == MAC_MODEL_IIFX) 332 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE); 333 return result; 334 } 335 336 static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata, 337 unsigned char *src, int len) 338 { 339 unsigned char *s = src; 340 u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4); 341 int result = 0; 342 343 hostdata->pdma_residual = len; 344 345 while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG, 346 BASR_DRQ | BASR_PHASE_MATCH, 347 BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) { 348 int bytes; 349 350 if (macintosh_config->ident == MAC_MODEL_IIFX) 351 write_ctrl_reg(hostdata, CTRL_HANDSHAKE_MODE | 352 CTRL_INTERRUPTS_ENABLE); 353 354 bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512)); 355 356 if (bytes > 0) { 357 s += bytes; 358 hostdata->pdma_residual -= bytes; 359 } 360 361 if (hostdata->pdma_residual == 0) { 362 if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG, 363 TCR_LAST_BYTE_SENT, 364 TCR_LAST_BYTE_SENT, 365 HZ / 64) < 0) { 366 scmd_printk(KERN_ERR, hostdata->connected, 367 "%s: Last Byte Sent timeout\n", __func__); 368 result = -1; 369 } 370 goto out; 371 } 372 373 if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ, 374 BUS_AND_STATUS_REG, BASR_ACK, 375 BASR_ACK, HZ / 64) < 0) 376 scmd_printk(KERN_DEBUG, hostdata->connected, 377 "%s: !REQ and !ACK\n", __func__); 378 if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) 379 goto out; 380 381 if (bytes == 0) 382 udelay(MAC_PDMA_DELAY); 383 384 if (bytes >= 0) 385 continue; 386 387 dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host, 388 "%s: bus error (%d/%d)\n", __func__, s - src, len); 389 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 390 result = -1; 391 goto out; 392 } 393 394 scmd_printk(KERN_ERR, hostdata->connected, 395 "%s: phase mismatch or !DRQ\n", __func__); 396 NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host); 397 result = -1; 398 out: 399 if (macintosh_config->ident == MAC_MODEL_IIFX) 400 write_ctrl_reg(hostdata, CTRL_INTERRUPTS_ENABLE); 401 return result; 402 } 403 404 static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata, 405 struct scsi_cmnd *cmd) 406 { 407 if (hostdata->flags & FLAG_NO_PSEUDO_DMA || 408 cmd->SCp.this_residual < setup_use_pdma) 409 return 0; 410 411 return cmd->SCp.this_residual; 412 } 413 414 static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata) 415 { 416 return hostdata->pdma_residual; 417 } 418 419 #include "NCR5380.c" 420 421 #define DRV_MODULE_NAME "mac_scsi" 422 #define PFX DRV_MODULE_NAME ": " 423 424 static struct scsi_host_template mac_scsi_template = { 425 .module = THIS_MODULE, 426 .proc_name = DRV_MODULE_NAME, 427 .name = "Macintosh NCR5380 SCSI", 428 .info = macscsi_info, 429 .queuecommand = macscsi_queue_command, 430 .eh_abort_handler = macscsi_abort, 431 .eh_host_reset_handler = macscsi_host_reset, 432 .can_queue = 16, 433 .this_id = 7, 434 .sg_tablesize = 1, 435 .cmd_per_lun = 2, 436 .dma_boundary = PAGE_SIZE - 1, 437 .cmd_size = NCR5380_CMD_SIZE, 438 .max_sectors = 128, 439 }; 440 441 static int __init mac_scsi_probe(struct platform_device *pdev) 442 { 443 struct Scsi_Host *instance; 444 struct NCR5380_hostdata *hostdata; 445 int error; 446 int host_flags = 0; 447 struct resource *irq, *pio_mem, *pdma_mem = NULL; 448 449 pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 450 if (!pio_mem) 451 return -ENODEV; 452 453 pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 454 455 irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0); 456 457 if (!hwreg_present((unsigned char *)pio_mem->start + 458 (STATUS_REG << 4))) { 459 pr_info(PFX "no device detected at %pap\n", &pio_mem->start); 460 return -ENODEV; 461 } 462 463 if (setup_can_queue > 0) 464 mac_scsi_template.can_queue = setup_can_queue; 465 if (setup_cmd_per_lun > 0) 466 mac_scsi_template.cmd_per_lun = setup_cmd_per_lun; 467 if (setup_sg_tablesize > 0) 468 mac_scsi_template.sg_tablesize = setup_sg_tablesize; 469 if (setup_hostid >= 0) 470 mac_scsi_template.this_id = setup_hostid & 7; 471 472 instance = scsi_host_alloc(&mac_scsi_template, 473 sizeof(struct NCR5380_hostdata)); 474 if (!instance) 475 return -ENOMEM; 476 477 if (irq) 478 instance->irq = irq->start; 479 else 480 instance->irq = NO_IRQ; 481 482 hostdata = shost_priv(instance); 483 hostdata->base = pio_mem->start; 484 hostdata->io = (u8 __iomem *)pio_mem->start; 485 486 if (pdma_mem && setup_use_pdma) 487 hostdata->pdma_io = (u8 __iomem *)pdma_mem->start; 488 else 489 host_flags |= FLAG_NO_PSEUDO_DMA; 490 491 host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0; 492 493 error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP); 494 if (error) 495 goto fail_init; 496 497 if (instance->irq != NO_IRQ) { 498 error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED, 499 "NCR5380", instance); 500 if (error) 501 goto fail_irq; 502 } 503 504 NCR5380_maybe_reset_bus(instance); 505 506 error = scsi_add_host(instance, NULL); 507 if (error) 508 goto fail_host; 509 510 platform_set_drvdata(pdev, instance); 511 512 scsi_scan_host(instance); 513 return 0; 514 515 fail_host: 516 if (instance->irq != NO_IRQ) 517 free_irq(instance->irq, instance); 518 fail_irq: 519 NCR5380_exit(instance); 520 fail_init: 521 scsi_host_put(instance); 522 return error; 523 } 524 525 static int __exit mac_scsi_remove(struct platform_device *pdev) 526 { 527 struct Scsi_Host *instance = platform_get_drvdata(pdev); 528 529 scsi_remove_host(instance); 530 if (instance->irq != NO_IRQ) 531 free_irq(instance->irq, instance); 532 NCR5380_exit(instance); 533 scsi_host_put(instance); 534 return 0; 535 } 536 537 static struct platform_driver mac_scsi_driver = { 538 .remove = __exit_p(mac_scsi_remove), 539 .driver = { 540 .name = DRV_MODULE_NAME, 541 }, 542 }; 543 544 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe); 545 546 MODULE_ALIAS("platform:" DRV_MODULE_NAME); 547 MODULE_LICENSE("GPL"); 548