Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * Adapted from mac_scsinew.c: |
| 7 | */ |
| 8 | /* |
| 9 | * Generic Macintosh NCR5380 driver |
| 10 | * |
| 11 | * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov> |
| 12 | * |
| 13 | * derived in part from: |
| 14 | */ |
| 15 | /* |
| 16 | * Generic Generic NCR5380 driver |
| 17 | * |
| 18 | * Copyright 1995, Russell King |
| 19 | * |
| 20 | * ALPHA RELEASE 1. |
| 21 | * |
| 22 | * For more information, please consult |
| 23 | * |
| 24 | * NCR 5380 Family |
| 25 | * SCSI Protocol Controller |
| 26 | * Databook |
| 27 | * |
| 28 | * NCR Microelectronics |
| 29 | * 1635 Aeroplaza Drive |
| 30 | * Colorado Springs, CO 80916 |
| 31 | * 1+ (719) 578-3400 |
| 32 | * 1+ (800) 334-5454 |
| 33 | */ |
| 34 | |
| 35 | |
| 36 | /* |
| 37 | * This is from mac_scsi.h, but hey, maybe this is useful for Sun3 too! :) |
| 38 | * |
| 39 | * Options : |
| 40 | * |
| 41 | * PARITY - enable parity checking. Not supported. |
| 42 | * |
| 43 | * SCSI2 - enable support for SCSI-II tagged queueing. Untested. |
| 44 | * |
| 45 | * USLEEP - enable support for devices that don't disconnect. Untested. |
| 46 | */ |
| 47 | |
| 48 | /* |
| 49 | * $Log: sun3_NCR5380.c,v $ |
| 50 | */ |
| 51 | |
| 52 | #define AUTOSENSE |
| 53 | |
| 54 | #include <linux/types.h> |
| 55 | #include <linux/stddef.h> |
| 56 | #include <linux/ctype.h> |
| 57 | #include <linux/delay.h> |
| 58 | |
| 59 | #include <linux/module.h> |
| 60 | #include <linux/signal.h> |
| 61 | #include <linux/sched.h> |
| 62 | #include <linux/ioport.h> |
| 63 | #include <linux/init.h> |
| 64 | #include <linux/blkdev.h> |
| 65 | |
| 66 | #include <asm/io.h> |
| 67 | #include <asm/system.h> |
| 68 | |
| 69 | #include <asm/sun3ints.h> |
| 70 | #include <asm/dvma.h> |
| 71 | #include <asm/idprom.h> |
| 72 | #include <asm/machines.h> |
| 73 | |
| 74 | /* dma on! */ |
| 75 | #define REAL_DMA |
| 76 | |
| 77 | #include "scsi.h" |
| 78 | #include <scsi/scsi_host.h> |
| 79 | #include "sun3_scsi.h" |
| 80 | #include "NCR5380.h" |
| 81 | |
| 82 | static void NCR5380_print(struct Scsi_Host *instance); |
| 83 | |
| 84 | /* #define OLDDMA */ |
| 85 | |
| 86 | #define USE_WRAPPER |
| 87 | /*#define RESET_BOOT */ |
| 88 | #define DRIVER_SETUP |
| 89 | |
| 90 | #define NDEBUG 0 |
| 91 | |
| 92 | /* |
| 93 | * BUG can be used to trigger a strange code-size related hang on 2.1 kernels |
| 94 | */ |
| 95 | #ifdef BUG |
| 96 | #undef RESET_BOOT |
| 97 | #undef DRIVER_SETUP |
| 98 | #endif |
| 99 | |
| 100 | /* #define SUPPORT_TAGS */ |
| 101 | |
| 102 | #define ENABLE_IRQ() enable_irq( IRQ_SUN3_SCSI ); |
| 103 | |
| 104 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 105 | static irqreturn_t scsi_sun3_intr(int irq, void *dummy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | static inline unsigned char sun3scsi_read(int reg); |
| 107 | static inline void sun3scsi_write(int reg, int value); |
| 108 | |
| 109 | static int setup_can_queue = -1; |
| 110 | module_param(setup_can_queue, int, 0); |
| 111 | static int setup_cmd_per_lun = -1; |
| 112 | module_param(setup_cmd_per_lun, int, 0); |
| 113 | static int setup_sg_tablesize = -1; |
| 114 | module_param(setup_sg_tablesize, int, 0); |
| 115 | #ifdef SUPPORT_TAGS |
| 116 | static int setup_use_tagged_queuing = -1; |
| 117 | module_param(setup_use_tagged_queuing, int, 0); |
| 118 | #endif |
| 119 | static int setup_hostid = -1; |
| 120 | module_param(setup_hostid, int, 0); |
| 121 | |
Henne | 811c936 | 2006-10-03 19:51:59 +0200 | [diff] [blame] | 122 | static struct scsi_cmnd *sun3_dma_setup_done = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | #define AFTER_RESET_DELAY (HZ/2) |
| 125 | |
| 126 | /* ms to wait after hitting dma regs */ |
| 127 | #define SUN3_DMA_DELAY 10 |
| 128 | |
| 129 | /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */ |
| 130 | #define SUN3_DVMA_BUFSIZE 0xe000 |
| 131 | |
| 132 | /* minimum number of bytes to do dma on */ |
| 133 | #define SUN3_DMA_MINSIZE 128 |
| 134 | |
| 135 | static volatile unsigned char *sun3_scsi_regp; |
| 136 | static volatile struct sun3_dma_regs *dregs; |
| 137 | #ifdef OLDDMA |
| 138 | static unsigned char *dmabuf = NULL; /* dma memory buffer */ |
| 139 | #endif |
| 140 | static struct sun3_udc_regs *udc_regs = NULL; |
| 141 | static unsigned char *sun3_dma_orig_addr = NULL; |
| 142 | static unsigned long sun3_dma_orig_count = 0; |
| 143 | static int sun3_dma_active = 0; |
| 144 | static unsigned long last_residual = 0; |
| 145 | |
| 146 | /* |
| 147 | * NCR 5380 register access functions |
| 148 | */ |
| 149 | |
| 150 | static inline unsigned char sun3scsi_read(int reg) |
| 151 | { |
| 152 | return( sun3_scsi_regp[reg] ); |
| 153 | } |
| 154 | |
| 155 | static inline void sun3scsi_write(int reg, int value) |
| 156 | { |
| 157 | sun3_scsi_regp[reg] = value; |
| 158 | } |
| 159 | |
| 160 | /* dma controller register access functions */ |
| 161 | |
| 162 | static inline unsigned short sun3_udc_read(unsigned char reg) |
| 163 | { |
| 164 | unsigned short ret; |
| 165 | |
| 166 | dregs->udc_addr = UDC_CSR; |
| 167 | udelay(SUN3_DMA_DELAY); |
| 168 | ret = dregs->udc_data; |
| 169 | udelay(SUN3_DMA_DELAY); |
| 170 | |
| 171 | return ret; |
| 172 | } |
| 173 | |
| 174 | static inline void sun3_udc_write(unsigned short val, unsigned char reg) |
| 175 | { |
| 176 | dregs->udc_addr = reg; |
| 177 | udelay(SUN3_DMA_DELAY); |
| 178 | dregs->udc_data = val; |
| 179 | udelay(SUN3_DMA_DELAY); |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * XXX: status debug |
| 184 | */ |
| 185 | static struct Scsi_Host *default_instance; |
| 186 | |
| 187 | /* |
Christoph Hellwig | d0be4a7d | 2005-10-31 18:31:40 +0100 | [diff] [blame] | 188 | * Function : int sun3scsi_detect(struct scsi_host_template * tpnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | * |
| 190 | * Purpose : initializes mac NCR5380 driver based on the |
| 191 | * command line / compile time port and irq definitions. |
| 192 | * |
| 193 | * Inputs : tpnt - template for this SCSI adapter. |
| 194 | * |
| 195 | * Returns : 1 if a host adapter was found, 0 if not. |
| 196 | * |
| 197 | */ |
| 198 | |
Christoph Hellwig | d0be4a7d | 2005-10-31 18:31:40 +0100 | [diff] [blame] | 199 | int sun3scsi_detect(struct scsi_host_template * tpnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | { |
| 201 | unsigned long ioaddr; |
| 202 | static int called = 0; |
| 203 | struct Scsi_Host *instance; |
| 204 | |
| 205 | /* check that this machine has an onboard 5380 */ |
| 206 | switch(idprom->id_machtype) { |
| 207 | case SM_SUN3|SM_3_50: |
| 208 | case SM_SUN3|SM_3_60: |
| 209 | break; |
| 210 | |
| 211 | default: |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | if(called) |
| 216 | return 0; |
| 217 | |
| 218 | tpnt->proc_name = "Sun3 5380 SCSI"; |
| 219 | |
| 220 | /* setup variables */ |
| 221 | tpnt->can_queue = |
| 222 | (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE; |
| 223 | tpnt->cmd_per_lun = |
| 224 | (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN; |
| 225 | tpnt->sg_tablesize = |
| 226 | (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE; |
| 227 | |
| 228 | if (setup_hostid >= 0) |
| 229 | tpnt->this_id = setup_hostid; |
| 230 | else { |
| 231 | /* use 7 as default */ |
| 232 | tpnt->this_id = 7; |
| 233 | } |
| 234 | |
| 235 | ioaddr = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE); |
| 236 | sun3_scsi_regp = (unsigned char *)ioaddr; |
| 237 | |
| 238 | dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8); |
| 239 | |
| 240 | if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs))) |
| 241 | == NULL) { |
| 242 | printk("SUN3 Scsi couldn't allocate DVMA memory!\n"); |
| 243 | return 0; |
| 244 | } |
| 245 | #ifdef OLDDMA |
| 246 | if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) { |
| 247 | printk("SUN3 Scsi couldn't allocate DVMA memory!\n"); |
| 248 | return 0; |
| 249 | } |
| 250 | #endif |
| 251 | #ifdef SUPPORT_TAGS |
| 252 | if (setup_use_tagged_queuing < 0) |
| 253 | setup_use_tagged_queuing = USE_TAGGED_QUEUING; |
| 254 | #endif |
| 255 | |
| 256 | instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata)); |
| 257 | if(instance == NULL) |
| 258 | return 0; |
| 259 | |
| 260 | default_instance = instance; |
| 261 | |
| 262 | instance->io_port = (unsigned long) ioaddr; |
| 263 | instance->irq = IRQ_SUN3_SCSI; |
| 264 | |
| 265 | NCR5380_init(instance, 0); |
| 266 | |
| 267 | instance->n_io_port = 32; |
| 268 | |
| 269 | ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0; |
| 270 | |
| 271 | if (request_irq(instance->irq, scsi_sun3_intr, |
| 272 | 0, "Sun3SCSI-5380", NULL)) { |
| 273 | #ifndef REAL_DMA |
| 274 | printk("scsi%d: IRQ%d not free, interrupts disabled\n", |
| 275 | instance->host_no, instance->irq); |
| 276 | instance->irq = SCSI_IRQ_NONE; |
| 277 | #else |
| 278 | printk("scsi%d: IRQ%d not free, bailing out\n", |
| 279 | instance->host_no, instance->irq); |
| 280 | return 0; |
| 281 | #endif |
| 282 | } |
| 283 | |
| 284 | printk("scsi%d: Sun3 5380 at port %lX irq", instance->host_no, instance->io_port); |
| 285 | if (instance->irq == SCSI_IRQ_NONE) |
| 286 | printk ("s disabled"); |
| 287 | else |
| 288 | printk (" %d", instance->irq); |
| 289 | printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d", |
| 290 | instance->can_queue, instance->cmd_per_lun, |
| 291 | SUN3SCSI_PUBLIC_RELEASE); |
| 292 | printk("\nscsi%d:", instance->host_no); |
| 293 | NCR5380_print_options(instance); |
| 294 | printk("\n"); |
| 295 | |
| 296 | dregs->csr = 0; |
| 297 | udelay(SUN3_DMA_DELAY); |
| 298 | dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR; |
| 299 | udelay(SUN3_DMA_DELAY); |
| 300 | dregs->fifo_count = 0; |
| 301 | |
| 302 | called = 1; |
| 303 | |
| 304 | #ifdef RESET_BOOT |
| 305 | sun3_scsi_reset_boot(instance); |
| 306 | #endif |
| 307 | |
| 308 | return 1; |
| 309 | } |
| 310 | |
| 311 | int sun3scsi_release (struct Scsi_Host *shpnt) |
| 312 | { |
| 313 | if (shpnt->irq != SCSI_IRQ_NONE) |
| 314 | free_irq (shpnt->irq, NULL); |
| 315 | |
| 316 | iounmap((void *)sun3_scsi_regp); |
| 317 | |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | #ifdef RESET_BOOT |
| 322 | /* |
| 323 | * Our 'bus reset on boot' function |
| 324 | */ |
| 325 | |
| 326 | static void sun3_scsi_reset_boot(struct Scsi_Host *instance) |
| 327 | { |
| 328 | unsigned long end; |
| 329 | |
| 330 | NCR5380_local_declare(); |
| 331 | NCR5380_setup(instance); |
| 332 | |
| 333 | /* |
| 334 | * Do a SCSI reset to clean up the bus during initialization. No |
| 335 | * messing with the queues, interrupts, or locks necessary here. |
| 336 | */ |
| 337 | |
| 338 | printk( "Sun3 SCSI: resetting the SCSI bus..." ); |
| 339 | |
| 340 | /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */ |
| 341 | // sun3_disable_irq( IRQ_SUN3_SCSI ); |
| 342 | |
| 343 | /* get in phase */ |
| 344 | NCR5380_write( TARGET_COMMAND_REG, |
| 345 | PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) )); |
| 346 | |
| 347 | /* assert RST */ |
| 348 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST ); |
| 349 | |
| 350 | /* The min. reset hold time is 25us, so 40us should be enough */ |
| 351 | udelay( 50 ); |
| 352 | |
| 353 | /* reset RST and interrupt */ |
| 354 | NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE ); |
| 355 | NCR5380_read( RESET_PARITY_INTERRUPT_REG ); |
| 356 | |
| 357 | for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); ) |
| 358 | barrier(); |
| 359 | |
| 360 | /* switch on SCSI IRQ again */ |
| 361 | // sun3_enable_irq( IRQ_SUN3_SCSI ); |
| 362 | |
| 363 | printk( " done\n" ); |
| 364 | } |
| 365 | #endif |
| 366 | |
| 367 | const char * sun3scsi_info (struct Scsi_Host *spnt) { |
| 368 | return ""; |
| 369 | } |
| 370 | |
| 371 | // safe bits for the CSR |
| 372 | #define CSR_GOOD 0x060f |
| 373 | |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 374 | static irqreturn_t scsi_sun3_intr(int irq, void *dummy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | { |
| 376 | unsigned short csr = dregs->csr; |
| 377 | int handled = 0; |
| 378 | |
| 379 | if(csr & ~CSR_GOOD) { |
| 380 | if(csr & CSR_DMA_BUSERR) { |
| 381 | printk("scsi%d: bus error in dma\n", default_instance->host_no); |
| 382 | } |
| 383 | |
| 384 | if(csr & CSR_DMA_CONFLICT) { |
| 385 | printk("scsi%d: dma conflict\n", default_instance->host_no); |
| 386 | } |
| 387 | handled = 1; |
| 388 | } |
| 389 | |
| 390 | if(csr & (CSR_SDB_INT | CSR_DMA_INT)) { |
David Howells | 7d12e78 | 2006-10-05 14:55:46 +0100 | [diff] [blame] | 391 | NCR5380_intr(irq, dummy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | handled = 1; |
| 393 | } |
| 394 | |
| 395 | return IRQ_RETVAL(handled); |
| 396 | } |
| 397 | |
| 398 | /* |
| 399 | * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; |
| 400 | * reentering NCR5380_print_status seems to have ugly side effects |
| 401 | */ |
| 402 | |
| 403 | /* this doesn't seem to get used at all -- sam */ |
| 404 | #if 0 |
| 405 | void sun3_sun3_debug (void) |
| 406 | { |
| 407 | unsigned long flags; |
| 408 | NCR5380_local_declare(); |
| 409 | |
| 410 | if (default_instance) { |
| 411 | local_irq_save(flags); |
| 412 | NCR5380_print_status(default_instance); |
| 413 | local_irq_restore(flags); |
| 414 | } |
| 415 | } |
| 416 | #endif |
| 417 | |
| 418 | |
| 419 | /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */ |
| 420 | static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag) |
| 421 | { |
| 422 | #ifdef OLDDMA |
| 423 | if(write_flag) |
| 424 | memcpy(dmabuf, data, count); |
| 425 | else { |
| 426 | sun3_dma_orig_addr = data; |
| 427 | sun3_dma_orig_count = count; |
| 428 | } |
| 429 | #else |
| 430 | void *addr; |
| 431 | |
| 432 | if(sun3_dma_orig_addr != NULL) |
| 433 | dvma_unmap(sun3_dma_orig_addr); |
| 434 | |
| 435 | // addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf); |
| 436 | addr = (void *)dvma_map((unsigned long) data, count); |
| 437 | |
| 438 | sun3_dma_orig_addr = addr; |
| 439 | sun3_dma_orig_count = count; |
| 440 | #endif |
| 441 | dregs->fifo_count = 0; |
| 442 | sun3_udc_write(UDC_RESET, UDC_CSR); |
| 443 | |
| 444 | /* reset fifo */ |
| 445 | dregs->csr &= ~CSR_FIFO; |
| 446 | dregs->csr |= CSR_FIFO; |
| 447 | |
| 448 | /* set direction */ |
| 449 | if(write_flag) |
| 450 | dregs->csr |= CSR_SEND; |
| 451 | else |
| 452 | dregs->csr &= ~CSR_SEND; |
| 453 | |
| 454 | /* byte count for fifo */ |
| 455 | dregs->fifo_count = count; |
| 456 | |
| 457 | sun3_udc_write(UDC_RESET, UDC_CSR); |
| 458 | |
| 459 | /* reset fifo */ |
| 460 | dregs->csr &= ~CSR_FIFO; |
| 461 | dregs->csr |= CSR_FIFO; |
| 462 | |
| 463 | if(dregs->fifo_count != count) { |
| 464 | printk("scsi%d: fifo_mismatch %04x not %04x\n", |
| 465 | default_instance->host_no, dregs->fifo_count, |
| 466 | (unsigned int) count); |
| 467 | NCR5380_print(default_instance); |
| 468 | } |
| 469 | |
| 470 | /* setup udc */ |
| 471 | #ifdef OLDDMA |
| 472 | udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8); |
| 473 | udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff); |
| 474 | #else |
| 475 | udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8); |
| 476 | udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff); |
| 477 | #endif |
| 478 | udc_regs->count = count/2; /* count in words */ |
| 479 | udc_regs->mode_hi = UDC_MODE_HIWORD; |
| 480 | if(write_flag) { |
| 481 | if(count & 1) |
| 482 | udc_regs->count++; |
| 483 | udc_regs->mode_lo = UDC_MODE_LSEND; |
| 484 | udc_regs->rsel = UDC_RSEL_SEND; |
| 485 | } else { |
| 486 | udc_regs->mode_lo = UDC_MODE_LRECV; |
| 487 | udc_regs->rsel = UDC_RSEL_RECV; |
| 488 | } |
| 489 | |
| 490 | /* announce location of regs block */ |
| 491 | sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8), |
| 492 | UDC_CHN_HI); |
| 493 | |
| 494 | sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO); |
| 495 | |
| 496 | /* set dma master on */ |
| 497 | sun3_udc_write(0xd, UDC_MODE); |
| 498 | |
| 499 | /* interrupt enable */ |
| 500 | sun3_udc_write(UDC_INT_ENABLE, UDC_CSR); |
| 501 | |
| 502 | return count; |
| 503 | |
| 504 | } |
| 505 | |
| 506 | static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance) |
| 507 | { |
| 508 | unsigned short resid; |
| 509 | |
| 510 | dregs->udc_addr = 0x32; |
| 511 | udelay(SUN3_DMA_DELAY); |
| 512 | resid = dregs->udc_data; |
| 513 | udelay(SUN3_DMA_DELAY); |
| 514 | resid *= 2; |
| 515 | |
| 516 | return (unsigned long) resid; |
| 517 | } |
| 518 | |
| 519 | static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance) |
| 520 | { |
| 521 | return last_residual; |
| 522 | } |
| 523 | |
Henne | 811c936 | 2006-10-03 19:51:59 +0200 | [diff] [blame] | 524 | static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted, |
| 525 | struct scsi_cmnd *cmd, |
| 526 | int write_flag) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | { |
Jens Axboe | 4aff5e2 | 2006-08-10 08:44:47 +0200 | [diff] [blame] | 528 | if(blk_fs_request(cmd->request)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | return wanted; |
| 530 | else |
| 531 | return 0; |
| 532 | } |
| 533 | |
| 534 | static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data) |
| 535 | { |
| 536 | |
| 537 | sun3_udc_write(UDC_CHN_START, UDC_CSR); |
| 538 | |
| 539 | return 0; |
| 540 | } |
| 541 | |
| 542 | /* clean up after our dma is done */ |
| 543 | static int sun3scsi_dma_finish(int write_flag) |
| 544 | { |
| 545 | unsigned short count; |
| 546 | unsigned short fifo; |
| 547 | int ret = 0; |
| 548 | |
| 549 | sun3_dma_active = 0; |
| 550 | #if 1 |
| 551 | // check to empty the fifo on a read |
| 552 | if(!write_flag) { |
| 553 | int tmo = 20000; /* .2 sec */ |
| 554 | |
| 555 | while(1) { |
| 556 | if(dregs->csr & CSR_FIFO_EMPTY) |
| 557 | break; |
| 558 | |
| 559 | if(--tmo <= 0) { |
| 560 | printk("sun3scsi: fifo failed to empty!\n"); |
| 561 | return 1; |
| 562 | } |
| 563 | udelay(10); |
| 564 | } |
| 565 | } |
| 566 | |
| 567 | #endif |
| 568 | |
| 569 | count = sun3scsi_dma_count(default_instance); |
| 570 | #ifdef OLDDMA |
| 571 | |
| 572 | /* if we've finished a read, copy out the data we read */ |
| 573 | if(sun3_dma_orig_addr) { |
| 574 | /* check for residual bytes after dma end */ |
| 575 | if(count && (NCR5380_read(BUS_AND_STATUS_REG) & |
| 576 | (BASR_PHASE_MATCH | BASR_ACK))) { |
| 577 | printk("scsi%d: sun3_scsi_finish: read overrun baby... ", default_instance->host_no); |
| 578 | printk("basr now %02x\n", NCR5380_read(BUS_AND_STATUS_REG)); |
| 579 | ret = count; |
| 580 | } |
| 581 | |
| 582 | /* copy in what we dma'd no matter what */ |
| 583 | memcpy(sun3_dma_orig_addr, dmabuf, sun3_dma_orig_count); |
| 584 | sun3_dma_orig_addr = NULL; |
| 585 | |
| 586 | } |
| 587 | #else |
| 588 | |
| 589 | fifo = dregs->fifo_count; |
| 590 | last_residual = fifo; |
| 591 | |
| 592 | /* empty bytes from the fifo which didn't make it */ |
| 593 | if((!write_flag) && (count - fifo) == 2) { |
| 594 | unsigned short data; |
| 595 | unsigned char *vaddr; |
| 596 | |
| 597 | data = dregs->fifo_data; |
| 598 | vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr); |
| 599 | |
| 600 | vaddr += (sun3_dma_orig_count - fifo); |
| 601 | |
| 602 | vaddr[-2] = (data & 0xff00) >> 8; |
| 603 | vaddr[-1] = (data & 0xff); |
| 604 | } |
| 605 | |
| 606 | dvma_unmap(sun3_dma_orig_addr); |
| 607 | sun3_dma_orig_addr = NULL; |
| 608 | #endif |
| 609 | sun3_udc_write(UDC_RESET, UDC_CSR); |
| 610 | dregs->fifo_count = 0; |
| 611 | dregs->csr &= ~CSR_SEND; |
| 612 | |
| 613 | /* reset fifo */ |
| 614 | dregs->csr &= ~CSR_FIFO; |
| 615 | dregs->csr |= CSR_FIFO; |
| 616 | |
| 617 | sun3_dma_setup_done = NULL; |
| 618 | |
| 619 | return ret; |
| 620 | |
| 621 | } |
| 622 | |
| 623 | #include "sun3_NCR5380.c" |
| 624 | |
Christoph Hellwig | d0be4a7d | 2005-10-31 18:31:40 +0100 | [diff] [blame] | 625 | static struct scsi_host_template driver_template = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | .name = SUN3_SCSI_NAME, |
| 627 | .detect = sun3scsi_detect, |
| 628 | .release = sun3scsi_release, |
| 629 | .info = sun3scsi_info, |
| 630 | .queuecommand = sun3scsi_queue_command, |
| 631 | .eh_abort_handler = sun3scsi_abort, |
| 632 | .eh_bus_reset_handler = sun3scsi_bus_reset, |
| 633 | .can_queue = CAN_QUEUE, |
| 634 | .this_id = 7, |
| 635 | .sg_tablesize = SG_TABLESIZE, |
| 636 | .cmd_per_lun = CMD_PER_LUN, |
| 637 | .use_clustering = DISABLE_CLUSTERING |
| 638 | }; |
| 639 | |
| 640 | |
| 641 | #include "scsi_module.c" |
| 642 | |
| 643 | MODULE_LICENSE("GPL"); |