1 /* 2 * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl) 3 * 4 * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net) 5 * 6 * VME support added by Sam Creasey 7 * 8 * Adapted from sun3_scsi.c -- see there for other headers 9 * 10 * TODO: modify this driver to support multiple Sun3 SCSI VME boards 11 * 12 */ 13 14 #define AUTOSENSE 15 16 #include <linux/types.h> 17 #include <linux/stddef.h> 18 #include <linux/ctype.h> 19 #include <linux/delay.h> 20 21 #include <linux/module.h> 22 #include <linux/signal.h> 23 #include <linux/ioport.h> 24 #include <linux/init.h> 25 #include <linux/blkdev.h> 26 27 #include <asm/io.h> 28 29 #include <asm/sun3ints.h> 30 #include <asm/dvma.h> 31 #include <asm/idprom.h> 32 #include <asm/machines.h> 33 34 #define SUN3_SCSI_VME 35 36 #undef SUN3_SCSI_DEBUG 37 38 /* dma on! */ 39 #define REAL_DMA 40 41 #include "scsi.h" 42 #include "initio.h" 43 #include <scsi/scsi_host.h> 44 #include "sun3_scsi.h" 45 #include "NCR5380.h" 46 47 extern int sun3_map_test(unsigned long, char *); 48 49 #define USE_WRAPPER 50 /*#define RESET_BOOT */ 51 #define DRIVER_SETUP 52 53 /* 54 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels 55 */ 56 #ifdef BUG 57 #undef RESET_BOOT 58 #undef DRIVER_SETUP 59 #endif 60 61 /* #define SUPPORT_TAGS */ 62 63 //#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 ); 64 #define ENABLE_IRQ() 65 66 67 static irqreturn_t scsi_sun3_intr(int irq, void *dummy); 68 static inline unsigned char sun3scsi_read(int reg); 69 static inline void sun3scsi_write(int reg, int value); 70 71 static int setup_can_queue = -1; 72 module_param(setup_can_queue, int, 0); 73 static int setup_cmd_per_lun = -1; 74 module_param(setup_cmd_per_lun, int, 0); 75 static int setup_sg_tablesize = -1; 76 module_param(setup_sg_tablesize, int, 0); 77 #ifdef SUPPORT_TAGS 78 static int setup_use_tagged_queuing = -1; 79 module_param(setup_use_tagged_queuing, int, 0); 80 #endif 81 static int setup_hostid = -1; 82 module_param(setup_hostid, int, 0); 83 84 static struct scsi_cmnd *sun3_dma_setup_done = NULL; 85 86 #define AFTER_RESET_DELAY (HZ/2) 87 88 /* ms to wait after hitting dma regs */ 89 #define SUN3_DMA_DELAY 10 90 91 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */ 92 #define SUN3_DVMA_BUFSIZE 0xe000 93 94 /* minimum number of bytes to do dma on */ 95 #define SUN3_DMA_MINSIZE 128 96 97 static volatile unsigned char *sun3_scsi_regp; 98 static volatile struct sun3_dma_regs *dregs; 99 #ifdef OLDDMA 100 static unsigned char *dmabuf = NULL; /* dma memory buffer */ 101 #endif 102 static unsigned char *sun3_dma_orig_addr = NULL; 103 static unsigned long sun3_dma_orig_count = 0; 104 static int sun3_dma_active = 0; 105 static unsigned long last_residual = 0; 106 107 /* 108 * NCR 5380 register access functions 109 */ 110 111 static inline unsigned char sun3scsi_read(int reg) 112 { 113 return( sun3_scsi_regp[reg] ); 114 } 115 116 static inline void sun3scsi_write(int reg, int value) 117 { 118 sun3_scsi_regp[reg] = value; 119 } 120 121 /* 122 * XXX: status debug 123 */ 124 static struct Scsi_Host *default_instance; 125 126 /* 127 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt) 128 * 129 * Purpose : initializes mac NCR5380 driver based on the 130 * command line / compile time port and irq definitions. 131 * 132 * Inputs : tpnt - template for this SCSI adapter. 133 * 134 * Returns : 1 if a host adapter was found, 0 if not. 135 * 136 */ 137 138 static int __init sun3scsi_detect(struct scsi_host_template * tpnt) 139 { 140 unsigned long ioaddr, irq = 0; 141 static int called = 0; 142 struct Scsi_Host *instance; 143 int i; 144 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI, 145 IOBASE_SUN3_VMESCSI + 0x4000, 146 0 }; 147 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0, 148 SUN3_VEC_VMESCSI1, 149 0 }; 150 /* check that this machine has an onboard 5380 */ 151 switch(idprom->id_machtype) { 152 case SM_SUN3|SM_3_160: 153 case SM_SUN3|SM_3_260: 154 break; 155 156 default: 157 return 0; 158 } 159 160 if(called) 161 return 0; 162 163 tpnt->proc_name = "Sun3 5380 VME SCSI"; 164 165 /* setup variables */ 166 tpnt->can_queue = 167 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE; 168 tpnt->cmd_per_lun = 169 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN; 170 tpnt->sg_tablesize = 171 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE; 172 173 if (setup_hostid >= 0) 174 tpnt->this_id = setup_hostid; 175 else { 176 /* use 7 as default */ 177 tpnt->this_id = 7; 178 } 179 180 ioaddr = 0; 181 for(i = 0; addrs[i] != 0; i++) { 182 unsigned char x; 183 184 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE, 185 SUN3_PAGE_TYPE_VME16); 186 irq = vecs[i]; 187 sun3_scsi_regp = (unsigned char *)ioaddr; 188 189 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8); 190 191 if(sun3_map_test((unsigned long)dregs, &x)) { 192 unsigned short oldcsr; 193 194 oldcsr = dregs->csr; 195 dregs->csr = 0; 196 udelay(SUN3_DMA_DELAY); 197 if(dregs->csr == 0x1400) 198 break; 199 200 dregs->csr = oldcsr; 201 } 202 203 iounmap((void *)ioaddr); 204 ioaddr = 0; 205 } 206 207 if(!ioaddr) 208 return 0; 209 210 #ifdef SUPPORT_TAGS 211 if (setup_use_tagged_queuing < 0) 212 setup_use_tagged_queuing = USE_TAGGED_QUEUING; 213 #endif 214 215 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata)); 216 if(instance == NULL) 217 return 0; 218 219 default_instance = instance; 220 221 instance->io_port = (unsigned long) ioaddr; 222 instance->irq = irq; 223 224 NCR5380_init(instance, 0); 225 226 instance->n_io_port = 32; 227 228 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0; 229 230 if (request_irq(instance->irq, scsi_sun3_intr, 231 0, "Sun3SCSI-5380VME", instance)) { 232 #ifndef REAL_DMA 233 printk("scsi%d: IRQ%d not free, interrupts disabled\n", 234 instance->host_no, instance->irq); 235 instance->irq = SCSI_IRQ_NONE; 236 #else 237 printk("scsi%d: IRQ%d not free, bailing out\n", 238 instance->host_no, instance->irq); 239 return 0; 240 #endif 241 } 242 243 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port); 244 if (instance->irq == SCSI_IRQ_NONE) 245 printk ("s disabled"); 246 else 247 printk (" %d", instance->irq); 248 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", 249 instance->can_queue, instance->cmd_per_lun, 250 SUN3SCSI_PUBLIC_RELEASE); 251 printk("\nscsi%d:", instance->host_no); 252 NCR5380_print_options(instance); 253 printk("\n"); 254 255 dregs->csr = 0; 256 udelay(SUN3_DMA_DELAY); 257 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR; 258 udelay(SUN3_DMA_DELAY); 259 dregs->fifo_count = 0; 260 dregs->fifo_count_hi = 0; 261 dregs->dma_addr_hi = 0; 262 dregs->dma_addr_lo = 0; 263 dregs->dma_count_hi = 0; 264 dregs->dma_count_lo = 0; 265 266 dregs->ivect = VME_DATA24 | (instance->irq & 0xff); 267 268 called = 1; 269 270 #ifdef RESET_BOOT 271 sun3_scsi_reset_boot(instance); 272 #endif 273 274 return 1; 275 } 276 277 int sun3scsi_release (struct Scsi_Host *shpnt) 278 { 279 if (shpnt->irq != SCSI_IRQ_NONE) 280 free_irq(shpnt->irq, shpnt); 281 282 iounmap((void *)sun3_scsi_regp); 283 284 NCR5380_exit(shpnt); 285 return 0; 286 } 287 288 #ifdef RESET_BOOT 289 /* 290 * Our 'bus reset on boot' function 291 */ 292 293 static void sun3_scsi_reset_boot(struct Scsi_Host *instance) 294 { 295 unsigned long end; 296 297 NCR5380_local_declare(); 298 NCR5380_setup(instance); 299 300 /* 301 * Do a SCSI reset to clean up the bus during initialization. No 302 * messing with the queues, interrupts, or locks necessary here. 303 */ 304 305 printk( "Sun3 SCSI: resetting the SCSI bus..." ); 306 307 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ 308 // sun3_disable_irq( IRQ_SUN3_SCSI ); 309 310 /* get in phase */ 311 NCR5380_write( TARGET_COMMAND_REG, 312 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); 313 314 /* assert RST */ 315 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); 316 317 /* The min. reset hold time is 25us, so 40us should be enough */ 318 udelay( 50 ); 319 320 /* reset RST and interrupt */ 321 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); 322 NCR5380_read( RESET_PARITY_INTERRUPT_REG ); 323 324 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) 325 barrier(); 326 327 /* switch on SCSI IRQ again */ 328 // sun3_enable_irq( IRQ_SUN3_SCSI ); 329 330 printk( " done\n" ); 331 } 332 #endif 333 334 static const char * sun3scsi_info (struct Scsi_Host *spnt) { 335 return ""; 336 } 337 338 // safe bits for the CSR 339 #define CSR_GOOD 0x060f 340 341 static irqreturn_t scsi_sun3_intr(int irq, void *dummy) 342 { 343 unsigned short csr = dregs->csr; 344 int handled = 0; 345 346 dregs->csr &= ~CSR_DMA_ENABLE; 347 348 349 #ifdef SUN3_SCSI_DEBUG 350 printk("scsi_intr csr %x\n", csr); 351 #endif 352 353 if(csr & ~CSR_GOOD) { 354 if(csr & CSR_DMA_BUSERR) { 355 printk("scsi%d: bus error in dma\n", default_instance->host_no); 356 #ifdef SUN3_SCSI_DEBUG 357 printk("scsi: residual %x count %x addr %p dmaaddr %x\n", 358 dregs->fifo_count, 359 dregs->dma_count_lo | (dregs->dma_count_hi << 16), 360 sun3_dma_orig_addr, 361 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16)); 362 #endif 363 } 364 365 if(csr & CSR_DMA_CONFLICT) { 366 printk("scsi%d: dma conflict\n", default_instance->host_no); 367 } 368 handled = 1; 369 } 370 371 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { 372 NCR5380_intr(irq, dummy); 373 handled = 1; 374 } 375 376 return IRQ_RETVAL(handled); 377 } 378 379 /* 380 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 381 * reentering NCR5380_print_status seems to have ugly side effects 382 */ 383 384 /* this doesn't seem to get used at all -- sam */ 385 #if 0 386 void sun3_sun3_debug (void) 387 { 388 unsigned long flags; 389 NCR5380_local_declare(); 390 391 if (default_instance) { 392 local_irq_save(flags); 393 NCR5380_print_status(default_instance); 394 local_irq_restore(flags); 395 } 396 } 397 #endif 398 399 400 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ 401 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) 402 { 403 void *addr; 404 405 if(sun3_dma_orig_addr != NULL) 406 dvma_unmap(sun3_dma_orig_addr); 407 408 // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf); 409 addr = (void *)dvma_map_vme((unsigned long) data, count); 410 411 sun3_dma_orig_addr = addr; 412 sun3_dma_orig_count = count; 413 414 #ifdef SUN3_SCSI_DEBUG 415 printk("scsi: dma_setup addr %p count %x\n", addr, count); 416 #endif 417 418 // dregs->fifo_count = 0; 419 #if 0 420 /* reset fifo */ 421 dregs->csr &= ~CSR_FIFO; 422 dregs->csr |= CSR_FIFO; 423 #endif 424 /* set direction */ 425 if(write_flag) 426 dregs->csr |= CSR_SEND; 427 else 428 dregs->csr &= ~CSR_SEND; 429 430 /* reset fifo */ 431 // dregs->csr &= ~CSR_FIFO; 432 // dregs->csr |= CSR_FIFO; 433 434 dregs->csr |= CSR_PACK_ENABLE; 435 436 dregs->dma_addr_hi = ((unsigned long)addr >> 16); 437 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff); 438 439 dregs->dma_count_hi = 0; 440 dregs->dma_count_lo = 0; 441 dregs->fifo_count_hi = 0; 442 dregs->fifo_count = 0; 443 444 #ifdef SUN3_SCSI_DEBUG 445 printk("scsi: dma_setup done csr %x\n", dregs->csr); 446 #endif 447 return count; 448 449 } 450 451 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) 452 { 453 return last_residual; 454 } 455 456 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, 457 struct scsi_cmnd *cmd, 458 int write_flag) 459 { 460 if (cmd->request->cmd_type == REQ_TYPE_FS) 461 return wanted; 462 else 463 return 0; 464 } 465 466 static int sun3scsi_dma_start(unsigned long count, char *data) 467 { 468 469 unsigned short csr; 470 471 csr = dregs->csr; 472 #ifdef SUN3_SCSI_DEBUG 473 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count); 474 #endif 475 476 dregs->dma_count_hi = (sun3_dma_orig_count >> 16); 477 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff); 478 479 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16); 480 dregs->fifo_count = (sun3_dma_orig_count & 0xffff); 481 482 // if(!(csr & CSR_DMA_ENABLE)) 483 // dregs->csr |= CSR_DMA_ENABLE; 484 485 return 0; 486 } 487 488 /* clean up after our dma is done */ 489 static int sun3scsi_dma_finish(int write_flag) 490 { 491 unsigned short fifo; 492 int ret = 0; 493 494 sun3_dma_active = 0; 495 496 dregs->csr &= ~CSR_DMA_ENABLE; 497 498 fifo = dregs->fifo_count; 499 if(write_flag) { 500 if((fifo > 0) && (fifo < sun3_dma_orig_count)) 501 fifo++; 502 } 503 504 last_residual = fifo; 505 #ifdef SUN3_SCSI_DEBUG 506 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count); 507 #endif 508 /* empty bytes from the fifo which didn't make it */ 509 if((!write_flag) && (dregs->csr & CSR_LEFT)) { 510 unsigned char *vaddr; 511 512 #ifdef SUN3_SCSI_DEBUG 513 printk("scsi: got left over bytes\n"); 514 #endif 515 516 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr); 517 518 vaddr += (sun3_dma_orig_count - fifo); 519 vaddr--; 520 521 switch(dregs->csr & CSR_LEFT) { 522 case CSR_LEFT_3: 523 *vaddr = (dregs->bpack_lo & 0xff00) >> 8; 524 vaddr--; 525 526 case CSR_LEFT_2: 527 *vaddr = (dregs->bpack_hi & 0x00ff); 528 vaddr--; 529 530 case CSR_LEFT_1: 531 *vaddr = (dregs->bpack_hi & 0xff00) >> 8; 532 break; 533 } 534 535 536 } 537 538 dvma_unmap(sun3_dma_orig_addr); 539 sun3_dma_orig_addr = NULL; 540 541 dregs->dma_addr_hi = 0; 542 dregs->dma_addr_lo = 0; 543 dregs->dma_count_hi = 0; 544 dregs->dma_count_lo = 0; 545 546 dregs->fifo_count = 0; 547 dregs->fifo_count_hi = 0; 548 549 dregs->csr &= ~CSR_SEND; 550 551 // dregs->csr |= CSR_DMA_ENABLE; 552 553 #if 0 554 /* reset fifo */ 555 dregs->csr &= ~CSR_FIFO; 556 dregs->csr |= CSR_FIFO; 557 #endif 558 sun3_dma_setup_done = NULL; 559 560 return ret; 561 562 } 563 564 #include "sun3_NCR5380.c" 565 566 static struct scsi_host_template driver_template = { 567 .name = SUN3_SCSI_NAME, 568 .detect = sun3scsi_detect, 569 .release = sun3scsi_release, 570 .info = sun3scsi_info, 571 .queuecommand = sun3scsi_queue_command, 572 .eh_abort_handler = sun3scsi_abort, 573 .eh_bus_reset_handler = sun3scsi_bus_reset, 574 .can_queue = CAN_QUEUE, 575 .this_id = 7, 576 .sg_tablesize = SG_TABLESIZE, 577 .cmd_per_lun = CMD_PER_LUN, 578 .use_clustering = DISABLE_CLUSTERING 579 }; 580 581 582 #include "scsi_module.c" 583 584 MODULE_LICENSE("GPL"); 585