Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * 68k mac 53c9[46] scsi driver |
| 3 | * |
| 4 | * copyright (c) 1998, David Weis weisd3458@uni.edu |
| 5 | * |
| 6 | * debugging on Quadra 800 and 660AV Michael Schmitz, Dave Kilzer 7/98 |
| 7 | * |
| 8 | * based loosely on cyber_esp.c |
| 9 | */ |
| 10 | |
| 11 | /* these are unused for now */ |
| 12 | #define myreadl(addr) (*(volatile unsigned int *) (addr)) |
| 13 | #define mywritel(b, addr) ((*(volatile unsigned int *) (addr)) = (b)) |
| 14 | |
| 15 | |
| 16 | #include <linux/kernel.h> |
| 17 | #include <linux/delay.h> |
| 18 | #include <linux/types.h> |
| 19 | #include <linux/ctype.h> |
| 20 | #include <linux/string.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/blkdev.h> |
| 23 | #include <linux/proc_fs.h> |
| 24 | #include <linux/stat.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/interrupt.h> |
| 27 | |
| 28 | #include "scsi.h" |
| 29 | #include <scsi/scsi_host.h> |
| 30 | #include "NCR53C9x.h" |
| 31 | |
| 32 | #include <asm/io.h> |
| 33 | |
| 34 | #include <asm/setup.h> |
| 35 | #include <asm/irq.h> |
| 36 | #include <asm/macints.h> |
| 37 | #include <asm/machw.h> |
| 38 | #include <asm/mac_via.h> |
| 39 | |
| 40 | #include <asm/pgtable.h> |
| 41 | |
| 42 | #include <asm/macintosh.h> |
| 43 | |
| 44 | /* #define DEBUG_MAC_ESP */ |
| 45 | |
| 46 | #define mac_turnon_irq(x) mac_enable_irq(x) |
| 47 | #define mac_turnoff_irq(x) mac_disable_irq(x) |
| 48 | |
| 49 | extern void esp_handle(struct NCR_ESP *esp); |
| 50 | extern void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs); |
| 51 | |
| 52 | static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count); |
| 53 | static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd *sp); |
| 54 | static void dma_dump_state(struct NCR_ESP * esp); |
| 55 | static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length); |
| 56 | static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length); |
| 57 | static void dma_ints_off(struct NCR_ESP * esp); |
| 58 | static void dma_ints_on(struct NCR_ESP * esp); |
| 59 | static int dma_irq_p(struct NCR_ESP * esp); |
| 60 | static int dma_irq_p_quick(struct NCR_ESP * esp); |
| 61 | static void dma_led_off(struct NCR_ESP * esp); |
| 62 | static void dma_led_on(struct NCR_ESP *esp); |
| 63 | static int dma_ports_p(struct NCR_ESP *esp); |
| 64 | static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write); |
| 65 | static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write); |
| 66 | |
| 67 | static int esp_dafb_dma_irq_p(struct NCR_ESP * espdev); |
| 68 | static int esp_iosb_dma_irq_p(struct NCR_ESP * espdev); |
| 69 | |
| 70 | static volatile unsigned char cmd_buffer[16]; |
| 71 | /* This is where all commands are put |
| 72 | * before they are transferred to the ESP chip |
| 73 | * via PIO. |
| 74 | */ |
| 75 | |
| 76 | static int esp_initialized = 0; |
| 77 | |
| 78 | static int setup_num_esps = -1; |
| 79 | static int setup_disconnect = -1; |
| 80 | static int setup_nosync = -1; |
| 81 | static int setup_can_queue = -1; |
| 82 | static int setup_cmd_per_lun = -1; |
| 83 | static int setup_sg_tablesize = -1; |
| 84 | #ifdef SUPPORT_TAGS |
| 85 | static int setup_use_tagged_queuing = -1; |
| 86 | #endif |
| 87 | static int setup_hostid = -1; |
| 88 | |
| 89 | /* |
| 90 | * Experimental ESP inthandler; check macints.c to make sure dev_id is |
| 91 | * set up properly! |
| 92 | */ |
| 93 | |
| 94 | void mac_esp_intr(int irq, void *dev_id, struct pt_regs *pregs) |
| 95 | { |
| 96 | struct NCR_ESP *esp = (struct NCR_ESP *) dev_id; |
| 97 | int irq_p = 0; |
| 98 | |
| 99 | /* Handle the one ESP interrupt showing at this IRQ level. */ |
| 100 | if(((esp)->irq & 0xff) == irq) { |
| 101 | /* |
| 102 | * Debug .. |
| 103 | */ |
| 104 | irq_p = esp->dma_irq_p(esp); |
| 105 | printk("mac_esp: irq_p %x current %p disconnected %p\n", |
| 106 | irq_p, esp->current_SC, esp->disconnected_SC); |
| 107 | |
| 108 | /* |
| 109 | * Mac: if we're here, it's an ESP interrupt for sure! |
| 110 | */ |
| 111 | if((esp->current_SC || esp->disconnected_SC)) { |
| 112 | esp->dma_ints_off(esp); |
| 113 | |
| 114 | ESPIRQ(("I%d(", esp->esp_id)); |
| 115 | esp_handle(esp); |
| 116 | ESPIRQ((")")); |
| 117 | |
| 118 | esp->dma_ints_on(esp); |
| 119 | } |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Debug hooks; use for playing with the interrupt flag testing and interrupt |
| 125 | * acknowledge on the various machines |
| 126 | */ |
| 127 | |
| 128 | void scsi_esp_polled(int irq, void *dev_id, struct pt_regs *pregs) |
| 129 | { |
| 130 | if (esp_initialized == 0) |
| 131 | return; |
| 132 | |
| 133 | mac_esp_intr(irq, dev_id, pregs); |
| 134 | } |
| 135 | |
| 136 | void fake_intr(int irq, void *dev_id, struct pt_regs *pregs) |
| 137 | { |
| 138 | #ifdef DEBUG_MAC_ESP |
| 139 | printk("mac_esp: got irq\n"); |
| 140 | #endif |
| 141 | |
| 142 | mac_esp_intr(irq, dev_id, pregs); |
| 143 | } |
| 144 | |
| 145 | irqreturn_t fake_drq(int irq, void *dev_id, struct pt_regs *pregs) |
| 146 | { |
| 147 | printk("mac_esp: got drq\n"); |
| 148 | return IRQ_HANDLED; |
| 149 | } |
| 150 | |
| 151 | #define DRIVER_SETUP |
| 152 | |
| 153 | /* |
| 154 | * Function : mac_esp_setup(char *str) |
| 155 | * |
| 156 | * Purpose : booter command line initialization of the overrides array, |
| 157 | * |
| 158 | * Inputs : str - parameters, separated by commas. |
| 159 | * |
| 160 | * Currently unused in the new driver; need to add settable parameters to the |
| 161 | * detect function. |
| 162 | * |
| 163 | */ |
| 164 | |
| 165 | static int __init mac_esp_setup(char *str) { |
| 166 | #ifdef DRIVER_SETUP |
| 167 | /* Format of mac53c9x parameter is: |
| 168 | * mac53c9x=<num_esps>,<disconnect>,<nosync>,<can_queue>,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags> |
| 169 | * Negative values mean don't change. |
| 170 | */ |
| 171 | |
| 172 | char *this_opt; |
| 173 | long opt; |
| 174 | |
| 175 | this_opt = strsep (&str, ","); |
| 176 | if(this_opt) { |
| 177 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 178 | |
| 179 | if (opt >= 0 && opt <= 2) |
| 180 | setup_num_esps = opt; |
| 181 | else if (opt > 2) |
| 182 | printk( "mac_esp_setup: invalid number of hosts %ld !\n", opt ); |
| 183 | |
| 184 | this_opt = strsep (&str, ","); |
| 185 | } |
| 186 | if(this_opt) { |
| 187 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 188 | |
| 189 | if (opt > 0) |
| 190 | setup_disconnect = opt; |
| 191 | |
| 192 | this_opt = strsep (&str, ","); |
| 193 | } |
| 194 | if(this_opt) { |
| 195 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 196 | |
| 197 | if (opt >= 0) |
| 198 | setup_nosync = opt; |
| 199 | |
| 200 | this_opt = strsep (&str, ","); |
| 201 | } |
| 202 | if(this_opt) { |
| 203 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 204 | |
| 205 | if (opt > 0) |
| 206 | setup_can_queue = opt; |
| 207 | |
| 208 | this_opt = strsep (&str, ","); |
| 209 | } |
| 210 | if(this_opt) { |
| 211 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 212 | |
| 213 | if (opt > 0) |
| 214 | setup_cmd_per_lun = opt; |
| 215 | |
| 216 | this_opt = strsep (&str, ","); |
| 217 | } |
| 218 | if(this_opt) { |
| 219 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 220 | |
| 221 | if (opt >= 0) { |
| 222 | setup_sg_tablesize = opt; |
| 223 | /* Must be <= SG_ALL (255) */ |
| 224 | if (setup_sg_tablesize > SG_ALL) |
| 225 | setup_sg_tablesize = SG_ALL; |
| 226 | } |
| 227 | |
| 228 | this_opt = strsep (&str, ","); |
| 229 | } |
| 230 | if(this_opt) { |
| 231 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 232 | |
| 233 | /* Must be between 0 and 7 */ |
| 234 | if (opt >= 0 && opt <= 7) |
| 235 | setup_hostid = opt; |
| 236 | else if (opt > 7) |
| 237 | printk( "mac_esp_setup: invalid host ID %ld !\n", opt); |
| 238 | |
| 239 | this_opt = strsep (&str, ","); |
| 240 | } |
| 241 | #ifdef SUPPORT_TAGS |
| 242 | if(this_opt) { |
| 243 | opt = simple_strtol( this_opt, NULL, 0 ); |
| 244 | if (opt >= 0) |
| 245 | setup_use_tagged_queuing = !!opt; |
| 246 | } |
| 247 | #endif |
| 248 | #endif |
| 249 | return 1; |
| 250 | } |
| 251 | |
| 252 | __setup("mac53c9x=", mac_esp_setup); |
| 253 | |
| 254 | |
| 255 | /* |
| 256 | * ESP address 'detection' |
| 257 | */ |
| 258 | |
| 259 | unsigned long get_base(int chip_num) |
| 260 | { |
| 261 | /* |
| 262 | * using the chip_num and mac model, figure out where the |
| 263 | * chips are mapped |
| 264 | */ |
| 265 | |
| 266 | unsigned long io_base = 0x50f00000; |
| 267 | unsigned int second_offset = 0x402; |
| 268 | unsigned long scsi_loc = 0; |
| 269 | |
| 270 | switch (macintosh_config->scsi_type) { |
| 271 | |
| 272 | /* 950, 900, 700 */ |
| 273 | case MAC_SCSI_QUADRA2: |
| 274 | scsi_loc = io_base + 0xf000 + ((chip_num == 0) ? 0 : second_offset); |
| 275 | break; |
| 276 | |
| 277 | /* av's */ |
| 278 | case MAC_SCSI_QUADRA3: |
| 279 | scsi_loc = io_base + 0x18000 + ((chip_num == 0) ? 0 : second_offset); |
| 280 | break; |
| 281 | |
| 282 | /* most quadra/centris models are like this */ |
| 283 | case MAC_SCSI_QUADRA: |
| 284 | scsi_loc = io_base + 0x10000; |
| 285 | break; |
| 286 | |
| 287 | default: |
| 288 | printk("mac_esp: get_base: hit default!\n"); |
| 289 | scsi_loc = io_base + 0x10000; |
| 290 | break; |
| 291 | |
| 292 | } /* switch */ |
| 293 | |
| 294 | printk("mac_esp: io base at 0x%lx\n", scsi_loc); |
| 295 | |
| 296 | return scsi_loc; |
| 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Model dependent ESP setup |
| 301 | */ |
| 302 | |
| 303 | int mac_esp_detect(Scsi_Host_Template * tpnt) |
| 304 | { |
| 305 | int quick = 0; |
| 306 | int chipnum, chipspresent = 0; |
| 307 | #if 0 |
| 308 | unsigned long timeout; |
| 309 | #endif |
| 310 | |
| 311 | if (esp_initialized > 0) |
| 312 | return -ENODEV; |
| 313 | |
| 314 | /* what do we have in this machine... */ |
| 315 | if (MACHW_PRESENT(MAC_SCSI_96)) { |
| 316 | chipspresent ++; |
| 317 | } |
| 318 | |
| 319 | if (MACHW_PRESENT(MAC_SCSI_96_2)) { |
| 320 | chipspresent ++; |
| 321 | } |
| 322 | |
| 323 | /* number of ESPs present ? */ |
| 324 | if (setup_num_esps >= 0) { |
| 325 | if (chipspresent >= setup_num_esps) |
| 326 | chipspresent = setup_num_esps; |
| 327 | else |
| 328 | printk("mac_esp_detect: num_hosts detected %d setup %d \n", |
| 329 | chipspresent, setup_num_esps); |
| 330 | } |
| 331 | |
| 332 | /* TODO: add disconnect / nosync flags */ |
| 333 | |
| 334 | /* setup variables */ |
| 335 | tpnt->can_queue = |
| 336 | (setup_can_queue > 0) ? setup_can_queue : 7; |
| 337 | tpnt->cmd_per_lun = |
| 338 | (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : 1; |
| 339 | tpnt->sg_tablesize = |
| 340 | (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_ALL; |
| 341 | |
| 342 | if (setup_hostid >= 0) |
| 343 | tpnt->this_id = setup_hostid; |
| 344 | else { |
| 345 | /* use 7 as default */ |
| 346 | tpnt->this_id = 7; |
| 347 | } |
| 348 | |
| 349 | #ifdef SUPPORT_TAGS |
| 350 | if (setup_use_tagged_queuing < 0) |
| 351 | setup_use_tagged_queuing = DEFAULT_USE_TAGGED_QUEUING; |
| 352 | #endif |
| 353 | |
| 354 | for (chipnum = 0; chipnum < chipspresent; chipnum ++) { |
| 355 | struct NCR_ESP * esp; |
| 356 | |
| 357 | esp = esp_allocate(tpnt, (void *) NULL); |
| 358 | esp->eregs = (struct ESP_regs *) get_base(chipnum); |
| 359 | |
| 360 | esp->dma_irq_p = &esp_dafb_dma_irq_p; |
| 361 | if (chipnum == 0) { |
| 362 | |
| 363 | if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) { |
| 364 | /* most machines except those below :-) */ |
| 365 | quick = 1; |
| 366 | esp->dma_irq_p = &esp_iosb_dma_irq_p; |
| 367 | } else if (macintosh_config->scsi_type == MAC_SCSI_QUADRA3) { |
| 368 | /* mostly av's */ |
| 369 | quick = 0; |
| 370 | } else { |
| 371 | /* q950, 900, 700 */ |
| 372 | quick = 1; |
| 373 | out_be32(0xf9800024, 0x1d1); |
| 374 | esp->dregs = (void *) 0xf9800024; |
| 375 | } |
| 376 | |
| 377 | } else { /* chipnum */ |
| 378 | |
| 379 | quick = 1; |
| 380 | out_be32(0xf9800028, 0x1d1); |
| 381 | esp->dregs = (void *) 0xf9800028; |
| 382 | |
| 383 | } /* chipnum == 0 */ |
| 384 | |
| 385 | /* use pio for command bytes; pio for message/data: TBI */ |
| 386 | esp->do_pio_cmds = 1; |
| 387 | |
| 388 | /* Set the command buffer */ |
| 389 | esp->esp_command = (volatile unsigned char*) cmd_buffer; |
| 390 | esp->esp_command_dvma = (__u32) cmd_buffer; |
| 391 | |
| 392 | /* various functions */ |
| 393 | esp->dma_bytes_sent = &dma_bytes_sent; |
| 394 | esp->dma_can_transfer = &dma_can_transfer; |
| 395 | esp->dma_dump_state = &dma_dump_state; |
| 396 | esp->dma_init_read = NULL; |
| 397 | esp->dma_init_write = NULL; |
| 398 | esp->dma_ints_off = &dma_ints_off; |
| 399 | esp->dma_ints_on = &dma_ints_on; |
| 400 | |
| 401 | esp->dma_ports_p = &dma_ports_p; |
| 402 | |
| 403 | |
| 404 | /* Optional functions */ |
| 405 | esp->dma_barrier = NULL; |
| 406 | esp->dma_drain = NULL; |
| 407 | esp->dma_invalidate = NULL; |
| 408 | esp->dma_irq_entry = NULL; |
| 409 | esp->dma_irq_exit = NULL; |
| 410 | esp->dma_led_on = NULL; |
| 411 | esp->dma_led_off = NULL; |
| 412 | esp->dma_poll = NULL; |
| 413 | esp->dma_reset = NULL; |
| 414 | |
| 415 | /* SCSI chip speed */ |
| 416 | /* below esp->cfreq = 40000000; */ |
| 417 | |
| 418 | |
| 419 | if (quick) { |
| 420 | /* 'quick' means there's handshake glue logic like in the 5380 case */ |
| 421 | esp->dma_setup = &dma_setup_quick; |
| 422 | } else { |
| 423 | esp->dma_setup = &dma_setup; |
| 424 | } |
| 425 | |
| 426 | if (chipnum == 0) { |
| 427 | |
| 428 | esp->irq = IRQ_MAC_SCSI; |
| 429 | |
| 430 | request_irq(IRQ_MAC_SCSI, esp_intr, 0, "Mac ESP SCSI", esp->ehost); |
| 431 | #if 0 /* conflicts with IOP ADB */ |
| 432 | request_irq(IRQ_MAC_SCSIDRQ, fake_drq, 0, "Mac ESP DRQ", esp->ehost); |
| 433 | #endif |
| 434 | |
| 435 | if (macintosh_config->scsi_type == MAC_SCSI_QUADRA) { |
| 436 | esp->cfreq = 16500000; |
| 437 | } else { |
| 438 | esp->cfreq = 25000000; |
| 439 | } |
| 440 | |
| 441 | |
| 442 | } else { /* chipnum == 1 */ |
| 443 | |
| 444 | esp->irq = IRQ_MAC_SCSIDRQ; |
| 445 | #if 0 /* conflicts with IOP ADB */ |
| 446 | request_irq(IRQ_MAC_SCSIDRQ, esp_intr, 0, "Mac ESP SCSI 2", esp->ehost); |
| 447 | #endif |
| 448 | |
| 449 | esp->cfreq = 25000000; |
| 450 | |
| 451 | } |
| 452 | |
| 453 | if (quick) { |
| 454 | printk("esp: using quick version\n"); |
| 455 | } |
| 456 | |
| 457 | printk("esp: addr at 0x%p\n", esp->eregs); |
| 458 | |
| 459 | esp->scsi_id = 7; |
| 460 | esp->diff = 0; |
| 461 | |
| 462 | esp_initialize(esp); |
| 463 | |
| 464 | } /* for chipnum */ |
| 465 | |
| 466 | if (chipspresent) |
| 467 | printk("\nmac_esp: %d esp controllers found\n", chipspresent); |
| 468 | |
| 469 | esp_initialized = chipspresent; |
| 470 | |
| 471 | return chipspresent; |
| 472 | } |
| 473 | |
| 474 | static int mac_esp_release(struct Scsi_Host *shost) |
| 475 | { |
| 476 | if (shost->irq) |
| 477 | free_irq(shost->irq, NULL); |
| 478 | if (shost->io_port && shost->n_io_port) |
| 479 | release_region(shost->io_port, shost->n_io_port); |
| 480 | scsi_unregister(shost); |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * I've been wondering what this is supposed to do, for some time. Talking |
| 486 | * to Allen Briggs: These machines have an extra register someplace where the |
| 487 | * DRQ pin of the ESP can be monitored. That isn't useful for determining |
| 488 | * anything else (such as reselect interrupt or other magic) though. |
| 489 | * Maybe make the semantics should be changed like |
| 490 | * if (esp->current_SC) |
| 491 | * ... check DRQ flag ... |
| 492 | * else |
| 493 | * ... disconnected, check pending VIA interrupt ... |
| 494 | * |
| 495 | * There's a problem with using the dabf flag or mac_irq_pending() here: both |
| 496 | * seem to return 1 even though no interrupt is currently pending, resulting |
| 497 | * in esp_exec_cmd() holding off the next command, and possibly infinite loops |
| 498 | * in esp_intr(). |
| 499 | * Short term fix: just use esp_status & ESP_STAT_INTR here, as long as we |
| 500 | * use simple PIO. The DRQ status will be important when implementing pseudo |
| 501 | * DMA mode (set up ESP transfer count, return, do a batch of bytes in PIO or |
| 502 | * 'hardware handshake' mode upon DRQ). |
| 503 | * If you plan on changing this (i.e. to save the esp_status register access in |
| 504 | * favor of a VIA register access or a shadow register for the IFR), make sure |
| 505 | * to try a debug version of this first to monitor what registers would be a good |
| 506 | * indicator of the ESP interrupt. |
| 507 | */ |
| 508 | |
| 509 | static int esp_dafb_dma_irq_p(struct NCR_ESP * esp) |
| 510 | { |
| 511 | unsigned int ret; |
| 512 | int sreg = esp_read(esp->eregs->esp_status); |
| 513 | |
| 514 | #ifdef DEBUG_MAC_ESP |
| 515 | printk("mac_esp: esp_dafb_dma_irq_p dafb %d irq %d\n", |
| 516 | readl(esp->dregs), mac_irq_pending(IRQ_MAC_SCSI)); |
| 517 | #endif |
| 518 | |
| 519 | sreg &= ESP_STAT_INTR; |
| 520 | |
| 521 | /* |
| 522 | * maybe working; this is essentially what's used for iosb_dma_irq_p |
| 523 | */ |
| 524 | if (sreg) |
| 525 | return 1; |
| 526 | else |
| 527 | return 0; |
| 528 | |
| 529 | /* |
| 530 | * didn't work ... |
| 531 | */ |
| 532 | #if 0 |
| 533 | if (esp->current_SC) |
| 534 | ret = readl(esp->dregs) & 0x200; |
| 535 | else if (esp->disconnected_SC) |
| 536 | ret = 1; /* sreg ?? */ |
| 537 | else |
| 538 | ret = mac_irq_pending(IRQ_MAC_SCSI); |
| 539 | |
| 540 | return(ret); |
| 541 | #endif |
| 542 | |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * See above: testing mac_irq_pending always returned 8 (SCSI IRQ) regardless |
| 547 | * of the actual ESP status. |
| 548 | */ |
| 549 | |
| 550 | static int esp_iosb_dma_irq_p(struct NCR_ESP * esp) |
| 551 | { |
| 552 | int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ); |
| 553 | int sreg = esp_read(esp->eregs->esp_status); |
| 554 | |
| 555 | #ifdef DEBUG_MAC_ESP |
| 556 | printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n", |
| 557 | mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI), |
| 558 | sreg, esp->current_SC, esp->disconnected_SC); |
| 559 | #endif |
| 560 | |
| 561 | sreg &= ESP_STAT_INTR; |
| 562 | |
| 563 | if (sreg) |
| 564 | return (sreg); |
| 565 | else |
| 566 | return 0; |
| 567 | } |
| 568 | |
| 569 | /* |
| 570 | * This seems to be OK for PIO at least ... usually 0 after PIO. |
| 571 | */ |
| 572 | |
| 573 | static int dma_bytes_sent(struct NCR_ESP * esp, int fifo_count) |
| 574 | { |
| 575 | |
| 576 | #ifdef DEBUG_MAC_ESP |
| 577 | printk("mac_esp: dma bytes sent = %x\n", fifo_count); |
| 578 | #endif |
| 579 | |
| 580 | return fifo_count; |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * dma_can_transfer is used to switch between DMA and PIO, if DMA (pseudo) |
| 585 | * is ever implemented. Returning 0 here will use PIO. |
| 586 | */ |
| 587 | |
| 588 | static int dma_can_transfer(struct NCR_ESP * esp, Scsi_Cmnd * sp) |
| 589 | { |
| 590 | unsigned long sz = sp->SCp.this_residual; |
| 591 | #if 0 /* no DMA yet; make conditional */ |
| 592 | if (sz > 0x10000000) { |
| 593 | sz = 0x10000000; |
| 594 | } |
| 595 | printk("mac_esp: dma can transfer = 0lx%x\n", sz); |
| 596 | #else |
| 597 | |
| 598 | #ifdef DEBUG_MAC_ESP |
| 599 | printk("mac_esp: pio to transfer = %ld\n", sz); |
| 600 | #endif |
| 601 | |
| 602 | sz = 0; |
| 603 | #endif |
| 604 | return sz; |
| 605 | } |
| 606 | |
| 607 | /* |
| 608 | * Not yet ... |
| 609 | */ |
| 610 | |
| 611 | static void dma_dump_state(struct NCR_ESP * esp) |
| 612 | { |
| 613 | #ifdef DEBUG_MAC_ESP |
| 614 | printk("mac_esp: dma_dump_state: called\n"); |
| 615 | #endif |
| 616 | #if 0 |
| 617 | ESPLOG(("esp%d: dma -- cond_reg<%02x>\n", |
| 618 | esp->esp_id, ((struct mac_dma_registers *) |
| 619 | (esp->dregs))->cond_reg)); |
| 620 | #endif |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * DMA setup: should be used to set up the ESP transfer count for pseudo |
| 625 | * DMA transfers; need a DRQ transfer function to do the actual transfer |
| 626 | */ |
| 627 | |
| 628 | static void dma_init_read(struct NCR_ESP * esp, char * vaddress, int length) |
| 629 | { |
| 630 | printk("mac_esp: dma_init_read\n"); |
| 631 | } |
| 632 | |
| 633 | |
| 634 | static void dma_init_write(struct NCR_ESP * esp, char * vaddress, int length) |
| 635 | { |
| 636 | printk("mac_esp: dma_init_write\n"); |
| 637 | } |
| 638 | |
| 639 | |
| 640 | static void dma_ints_off(struct NCR_ESP * esp) |
| 641 | { |
| 642 | mac_turnoff_irq(esp->irq); |
| 643 | } |
| 644 | |
| 645 | |
| 646 | static void dma_ints_on(struct NCR_ESP * esp) |
| 647 | { |
| 648 | mac_turnon_irq(esp->irq); |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * generic dma_irq_p(), unused |
| 653 | */ |
| 654 | |
| 655 | static int dma_irq_p(struct NCR_ESP * esp) |
| 656 | { |
| 657 | int i = esp_read(esp->eregs->esp_status); |
| 658 | |
| 659 | #ifdef DEBUG_MAC_ESP |
| 660 | printk("mac_esp: dma_irq_p status %d\n", i); |
| 661 | #endif |
| 662 | |
| 663 | return (i & ESP_STAT_INTR); |
| 664 | } |
| 665 | |
| 666 | static int dma_irq_p_quick(struct NCR_ESP * esp) |
| 667 | { |
| 668 | /* |
| 669 | * Copied from iosb_dma_irq_p() |
| 670 | */ |
| 671 | int ret = mac_irq_pending(IRQ_MAC_SCSI) || mac_irq_pending(IRQ_MAC_SCSIDRQ); |
| 672 | int sreg = esp_read(esp->eregs->esp_status); |
| 673 | |
| 674 | #ifdef DEBUG_MAC_ESP |
| 675 | printk("mac_esp: dma_irq_p drq %d irq %d sreg %x curr %p disc %p\n", |
| 676 | mac_irq_pending(IRQ_MAC_SCSIDRQ), mac_irq_pending(IRQ_MAC_SCSI), |
| 677 | sreg, esp->current_SC, esp->disconnected_SC); |
| 678 | #endif |
| 679 | |
| 680 | sreg &= ESP_STAT_INTR; |
| 681 | |
| 682 | if (sreg) |
| 683 | return (sreg); |
| 684 | else |
| 685 | return 0; |
| 686 | |
| 687 | } |
| 688 | |
| 689 | static void dma_led_off(struct NCR_ESP * esp) |
| 690 | { |
| 691 | #ifdef DEBUG_MAC_ESP |
| 692 | printk("mac_esp: dma_led_off: called\n"); |
| 693 | #endif |
| 694 | } |
| 695 | |
| 696 | |
| 697 | static void dma_led_on(struct NCR_ESP * esp) |
| 698 | { |
| 699 | #ifdef DEBUG_MAC_ESP |
| 700 | printk("mac_esp: dma_led_on: called\n"); |
| 701 | #endif |
| 702 | } |
| 703 | |
| 704 | |
| 705 | static int dma_ports_p(struct NCR_ESP * esp) |
| 706 | { |
| 707 | return 0; |
| 708 | } |
| 709 | |
| 710 | |
| 711 | static void dma_setup(struct NCR_ESP * esp, __u32 addr, int count, int write) |
| 712 | { |
| 713 | |
| 714 | #ifdef DEBUG_MAC_ESP |
| 715 | printk("mac_esp: dma_setup\n"); |
| 716 | #endif |
| 717 | |
| 718 | if (write) { |
| 719 | dma_init_read(esp, (char *) addr, count); |
| 720 | } else { |
| 721 | dma_init_write(esp, (char *) addr, count); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | |
| 726 | static void dma_setup_quick(struct NCR_ESP * esp, __u32 addr, int count, int write) |
| 727 | { |
| 728 | #ifdef DEBUG_MAC_ESP |
| 729 | printk("mac_esp: dma_setup_quick\n"); |
| 730 | #endif |
| 731 | } |
| 732 | |
| 733 | static Scsi_Host_Template driver_template = { |
| 734 | .proc_name = "mac_esp", |
| 735 | .name = "Mac 53C9x SCSI", |
| 736 | .detect = mac_esp_detect, |
| 737 | .slave_alloc = esp_slave_alloc, |
| 738 | .slave_destroy = esp_slave_destroy, |
| 739 | .release = mac_esp_release, |
| 740 | .info = esp_info, |
| 741 | .queuecommand = esp_queue, |
| 742 | .eh_abort_handler = esp_abort, |
| 743 | .eh_bus_reset_handler = esp_reset, |
| 744 | .can_queue = 7, |
| 745 | .this_id = 7, |
| 746 | .sg_tablesize = SG_ALL, |
| 747 | .cmd_per_lun = 1, |
| 748 | .use_clustering = DISABLE_CLUSTERING |
| 749 | }; |
| 750 | |
| 751 | |
| 752 | #include "scsi_module.c" |
| 753 | |
| 754 | MODULE_LICENSE("GPL"); |