1 /* $NetBSD: atari5380.c,v 1.67 2026/04/26 10:52:14 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 1995 Leo Weppelman. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 __KERNEL_RCSID(0, "$NetBSD: atari5380.c,v 1.67 2026/04/26 10:52:14 thorpej Exp $"); 30 31 #include "opt_atariscsi.h" 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/device.h> 37 #include <sys/buf.h> 38 #include <dev/scsipi/scsi_all.h> 39 #include <dev/scsipi/scsipi_all.h> 40 #include <dev/scsipi/scsi_message.h> 41 #include <dev/scsipi/scsiconf.h> 42 43 #include <uvm/uvm_extern.h> 44 45 #include <m68k/asm_single.h> 46 #include <m68k/cpu.h> 47 #include <m68k/cacheops.h> 48 49 #include <atari/atari/stalloc.h> 50 51 /* 52 * Include the driver definitions 53 */ 54 #include <atari/dev/ncr5380reg.h> 55 56 #include <machine/iomap.h> 57 #include <machine/mfp.h> 58 #include <machine/intr.h> 59 60 #if defined(FALCON_SCSI) 61 #include <machine/dma.h> 62 #endif 63 64 /* 65 * Set the various driver options 66 */ 67 #define NREQ 18 /* Size of issue queue */ 68 #define AUTO_SENSE 1 /* Automatically issue a request-sense */ 69 70 #define DRNAME ncrscsi /* used in various prints */ 71 #undef DBG_SEL /* Show the selection process */ 72 #undef DBG_REQ /* Show enqueued/ready requests */ 73 #undef DBG_ERR_RET /* Show requests with != 0 return code */ 74 #undef DBG_NOWRITE /* Do not allow writes to the targets */ 75 #undef DBG_PIO /* Show the polled-I/O process */ 76 #undef DBG_INF /* Show information transfer process */ 77 #define DBG_NOSTATIC /* No static functions, all in DDB trace*/ 78 #define DBG_PID 15 /* Keep track of driver */ 79 #define REAL_DMA /* Use DMA if sensible */ 80 #if defined(FALCON_SCSI) 81 #define REAL_DMA_POLL 1 /* 1: Poll for end of DMA-transfer */ 82 #else 83 #define REAL_DMA_POLL 0 /* 1: Poll for end of DMA-transfer */ 84 #endif 85 #undef USE_PDMA /* Use special pdma-transfer function */ 86 #define MIN_PHYS 65536 /*BARF!!!!*/ 87 88 /* 89 * Include more driver definitions 90 */ 91 #include <atari/dev/ncr5380var.h> 92 93 /* 94 * The atari specific driver options 95 */ 96 #undef NO_TTRAM_DMA /* Do not use DMA to TT-ram. This */ 97 /* fails on older atari's */ 98 #define ENABLE_NCR5380(sc) cur_softc = sc; 99 100 static uint8_t *alloc_bounceb(u_long); 101 static void free_bounceb(uint8_t *); 102 static int machine_match(device_t, cfdata_t, void *, struct cfdriver *); 103 104 void scsi_ctrl(int); 105 void scsi_dma(int); 106 107 /* 108 * Functions that do nothing on the atari 109 */ 110 #define pdma_ready() 0 111 112 #if defined(TT_SCSI) 113 114 void ncr5380_drq_intr(int); 115 116 /* 117 * Define all the things we need of the DMA-controller 118 */ 119 #define SCSI_DMA ((struct scsi_dma *)AD_SCSI_DMA) 120 #define SCSI_5380 ((struct scsi_5380 *)AD_NCR5380) 121 122 struct scsi_dma { 123 volatile uint8_t s_dma_ptr[8]; /* use only the odd bytes */ 124 volatile uint8_t s_dma_cnt[8]; /* use only the odd bytes */ 125 volatile uint8_t s_dma_res[4]; /* data residue register */ 126 volatile uint8_t s_dma_gap; /* not used */ 127 volatile uint8_t s_dma_ctrl; /* control register */ 128 volatile uint8_t s_dma_gap2; /* not used */ 129 volatile uint8_t s_hdma_ctrl; /* Hades control register */ 130 }; 131 132 static inline void set_scsi_dma(volatile uint8_t *, u_long); 133 static inline u_long get_scsi_dma(volatile uint8_t *); 134 135 static inline void 136 set_scsi_dma(volatile uint8_t *addr, u_long val) 137 { 138 volatile uint8_t *address; 139 140 address = addr + 1; 141 __asm("movepl %0, %1@(0)": :"d" (val), "a" (address)); 142 } 143 144 static inline u_long 145 get_scsi_dma(volatile uint8_t *addr) 146 { 147 volatile uint8_t *address; 148 u_long nval; 149 150 address = addr + 1; 151 __asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); 152 153 return nval; 154 } 155 156 /* 157 * Defines for TT-DMA control register 158 */ 159 #define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/ 160 #define SD_ZERO 0x40 /* 1 = byte counter is zero */ 161 #define SD_ENABLE 0x02 /* 1 = Enable DMA */ 162 #define SD_OUT 0x01 /* Direction: memory to SCSI */ 163 #define SD_IN 0x00 /* Direction: SCSI to memory */ 164 165 /* 166 * Defines for Hades-DMA control register 167 */ 168 #define SDH_BUSERR 0x02 /* 1 = Bus error */ 169 #define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */ 170 #define SDH_ZERO 0x40 /* 1 = Byte counter is zero */ 171 172 /* 173 * Define the 5380 register set 174 */ 175 struct scsi_5380 { 176 volatile uint8_t scsi_5380[16]; /* use only the odd bytes */ 177 }; 178 #endif /* TT_SCSI */ 179 180 /********************************************** 181 * Variables present for both TT and Falcon. * 182 **********************************************/ 183 184 /* 185 * Softc of currently active controller (a bit of fake; we only have one) 186 */ 187 static struct ncr_softc *cur_softc; 188 189 #if defined(TT_SCSI) && !defined(FALCON_SCSI) 190 /* 191 * We can be more efficient for some functions when only TT_SCSI is selected 192 */ 193 #define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 194 #define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 195 196 #define scsi_mach_init(sc) scsi_tt_init(sc) 197 #define scsi_ienable() scsi_tt_ienable() 198 #define scsi_idisable() scsi_tt_idisable() 199 #define scsi_clr_ipend() scsi_tt_clr_ipend() 200 #define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) 201 #define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m) 202 #define wrong_dma_range(r,d) tt_wrong_dma_range(r, d) 203 #define poll_edma(reqp) tt_poll_edma(reqp) 204 #define get_dma_result(r, b) tt_get_dma_result(r, b) 205 #define can_access_5380() 1 206 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 207 208 #define fair_to_keep_dma() 1 209 #define claimed_dma() 1 210 #define reconsider_dma() 211 212 #endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */ 213 214 #if defined(TT_SCSI) 215 216 /* 217 * Prototype functions defined below 218 */ 219 #ifdef NO_TTRAM_DMA 220 static int tt_wrong_dma_range(SC_REQ *, struct dma_chain *); 221 #endif 222 static void scsi_tt_init(struct ncr_softc *); 223 static uint8_t get_tt_5380_reg(u_short); 224 static void set_tt_5380_reg(u_short, u_short); 225 static void scsi_tt_dmasetup(SC_REQ *, u_int, uint8_t); 226 static int tt_poll_edma(SC_REQ *); 227 static uint8_t *ptov(SC_REQ *, u_long*); 228 static int tt_get_dma_result(SC_REQ *, u_long *); 229 230 void scsi_tt_ienable(void); 231 void scsi_tt_idisable(void); 232 void scsi_tt_clr_ipend(void); 233 234 /* 235 * Define these too, so we can use them locally... 236 */ 237 #define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 238 #define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 239 240 #ifdef NO_TTRAM_DMA 241 static int 242 tt_wrong_dma_range(SC_REQ *reqp, struct dma_chain *dm) 243 { 244 245 if (dm->dm_addr & 0xff000000) { 246 reqp->dr_flag |= DRIVER_BOUNCING; 247 return 1; 248 } 249 return 0; 250 } 251 #else 252 #define tt_wrong_dma_range(reqp, dm) 0 253 #endif 254 255 static void 256 scsi_tt_init(struct ncr_softc *sc) 257 { 258 259 /* 260 * Enable SCSI-related interrupts 261 */ 262 MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */ 263 264 if (machineid & ATARI_TT) { 265 /* SCSI-DMA interrupts */ 266 MFP2->mf_ierb |= IB_SCDM; 267 MFP2->mf_iprb = (uint8_t)~IB_SCDM; 268 MFP2->mf_imrb |= IB_SCDM; 269 } else if (machineid & ATARI_HADES) { 270 SCSI_DMA->s_hdma_ctrl = 0; 271 272 if (intr_establish(2, AUTO_VEC, 0, 273 (hw_ifun_t)ncr5380_drq_intr, NULL) == NULL) 274 panic("scsi_tt_init: Can't establish drq-interrupt"); 275 } else 276 panic("scsi_tt_init: should not come here"); 277 278 MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */ 279 MFP2->mf_ipra = (uint8_t)~IA_SCSI; 280 MFP2->mf_imra |= IA_SCSI; 281 282 /* 283 * LWP: DMA transfers to TT-ram causes data to be garbled 284 * without notice on some TT-mainboard revisions. 285 * If programs generate mysterious Segmentations faults, 286 * try enabling NO_TTRAM_DMA. 287 */ 288 #ifdef NO_TTRAM_DMA 289 printf(": DMA to TT-RAM is disabled!"); 290 #endif 291 } 292 293 static uint8_t 294 get_tt_5380_reg(u_short rnum) 295 { 296 297 return SCSI_5380->scsi_5380[(rnum << 1) | 1]; 298 } 299 300 static void 301 set_tt_5380_reg(u_short rnum, u_short val) 302 { 303 304 SCSI_5380->scsi_5380[(rnum << 1) | 1] = val; 305 } 306 307 static inline void 308 scsi_tt_ienable(void) 309 { 310 311 if (machineid & ATARI_TT) 312 single_inst_bset_b(MFP2->mf_imrb, IB_SCDM); 313 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 314 } 315 316 static inline void 317 scsi_tt_idisable(void) 318 { 319 320 if (machineid & ATARI_TT) 321 single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM); 322 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 323 } 324 325 static inline void 326 scsi_tt_clr_ipend(void) 327 { 328 SCSI_DMA->s_dma_ctrl = 0; 329 GET_TT_REG(NCR5380_IRCV); 330 if (machineid & ATARI_TT) 331 MFP2->mf_iprb = (uint8_t)~IB_SCDM; 332 MFP2->mf_ipra = (uint8_t)~IA_SCSI; 333 334 /* 335 * Remove interrupts already scheduled. 336 */ 337 rem_sicallback((si_farg)ncr_ctrl_intr); 338 rem_sicallback((si_farg)ncr_dma_intr); 339 } 340 341 static void 342 scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, uint8_t mode) 343 { 344 345 if (PH_IN(phase)) { 346 SCSI_DMA->s_dma_ctrl = SD_IN; 347 if (machineid & ATARI_HADES) 348 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 349 set_scsi_dma(SCSI_DMA->s_dma_ptr, reqp->dm_cur->dm_addr); 350 set_scsi_dma(SCSI_DMA->s_dma_cnt, reqp->dm_cur->dm_count); 351 SET_TT_REG(NCR5380_ICOM, 0); 352 SET_TT_REG(NCR5380_MODE, mode); 353 SCSI_DMA->s_dma_ctrl = SD_ENABLE; 354 SET_TT_REG(NCR5380_IRCV, 0); 355 } else { 356 SCSI_DMA->s_dma_ctrl = SD_OUT; 357 if (machineid & ATARI_HADES) 358 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 359 set_scsi_dma(SCSI_DMA->s_dma_ptr, reqp->dm_cur->dm_addr); 360 set_scsi_dma(SCSI_DMA->s_dma_cnt, reqp->dm_cur->dm_count); 361 SET_TT_REG(NCR5380_MODE, mode); 362 SET_TT_REG(NCR5380_ICOM, SC_ADTB); 363 SET_TT_REG(NCR5380_DMSTAT, 0); 364 SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT; 365 } 366 } 367 368 static int 369 tt_poll_edma(SC_REQ *reqp) 370 { 371 uint8_t dmstat, dmastat; 372 int timeout = 9000; /* XXX */ 373 374 /* 375 * We wait here until the DMA has finished. This can be 376 * achieved by checking the following conditions: 377 * - 5380: 378 * - End of DMA flag is set 379 * - We lost BSY (error!!) 380 * - A phase mismatch has occurred (partial transfer) 381 * - DMA-controller: 382 * - A bus error occurred (Kernel error!!) 383 * - All bytes are transferred 384 * If one of the terminating conditions was met, we call 385 * 'dma_ready' to check errors and perform the bookkeeping. 386 */ 387 388 scsi_tt_idisable(); 389 for (;;) { 390 delay(20); 391 if (--timeout <= 0) { 392 ncr_tprint(reqp, "timeout on polled transfer\n"); 393 reqp->xs->error = XS_TIMEOUT; 394 scsi_tt_ienable(); 395 return 0; 396 } 397 dmstat = GET_TT_REG(NCR5380_DMSTAT); 398 399 if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) { 400 ncr5380_drq_intr(1); 401 dmstat = GET_TT_REG(NCR5380_DMSTAT); 402 } 403 404 dmastat = SCSI_DMA->s_dma_ctrl; 405 if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET)) 406 break; 407 if ((dmstat & SC_PHS_MTCH) == 0) 408 break; 409 if (dmastat & (SD_BUSERR|SD_ZERO)) 410 break; 411 } 412 scsi_tt_ienable(); 413 return 1; 414 } 415 416 /* 417 * Convert physical DMA address to a virtual address. 418 */ 419 static uint8_t * 420 ptov(SC_REQ *reqp, u_long *phaddr) 421 { 422 struct dma_chain *dm; 423 uint8_t *vaddr; 424 425 dm = reqp->dm_chain; 426 vaddr = reqp->xdata_ptr; 427 for (; dm < reqp->dm_cur; dm++) 428 vaddr += dm->dm_count; 429 vaddr += (u_long)phaddr - dm->dm_addr; 430 return vaddr; 431 } 432 433 static int 434 tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left) 435 { 436 int dmastat, dmstat; 437 uint8_t *byte_p; 438 u_long leftover; 439 440 dmastat = SCSI_DMA->s_dma_ctrl; 441 dmstat = GET_TT_REG(NCR5380_DMSTAT); 442 leftover = get_scsi_dma(SCSI_DMA->s_dma_cnt); 443 byte_p = (uint8_t *)get_scsi_dma(SCSI_DMA->s_dma_ptr); 444 445 if (dmastat & SD_BUSERR) { 446 /* 447 * The DMA-controller seems to access 8 bytes beyond 448 * its limits on output. Therefore check also the byte 449 * count. If it's zero, ignore the bus error. 450 */ 451 if (leftover != 0) { 452 ncr_tprint(reqp, 453 "SCSI-DMA buserror - accessing 0x%x\n", byte_p); 454 reqp->xs->error = XS_DRIVER_STUFFUP; 455 } 456 } 457 458 /* 459 * We handle the following special condition below: 460 * -- The device disconnects in the middle of a write operation -- 461 * In this case, the 5380 has already pre-fetched the next byte from 462 * the DMA-controller before the phase mismatch occurs. Therefore, 463 * leftover is 1 too low. 464 * This does not always happen! Therefore, we only do this when 465 * leftover is odd. This assumes that DMA transfers are _even_! This 466 * is normally the case on disks and types but might not always be. 467 * XXX: Check if ACK is consistently high on these occasions LWP 468 */ 469 if ((leftover & 1) && 470 (dmstat & SC_PHS_MTCH) == 0 && PH_OUT(reqp->phase)) 471 leftover++; 472 473 /* 474 * Check if there are some 'restbytes' left in the DMA-controller. 475 */ 476 if ((machineid & ATARI_TT) && 477 ((u_long)byte_p & 3) && PH_IN(reqp->phase)) { 478 uint8_t *p; 479 volatile uint8_t *q; 480 481 p = ptov(reqp, (u_long *)((u_long)byte_p & ~3)); 482 q = SCSI_DMA->s_dma_res; 483 switch ((u_long)byte_p & 3) { 484 case 3: *p++ = *q++; 485 case 2: *p++ = *q++; 486 case 1: *p++ = *q++; 487 } 488 } 489 *bytes_left = leftover; 490 return (dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0; 491 } 492 493 static uint8_t *dma_ptr; 494 void 495 ncr5380_drq_intr(int poll) 496 { 497 label_t faultbuf; 498 int write; 499 u_long count; 500 volatile uint8_t *data_p = (volatile uint8_t *)(stio_addr + 0x741); 501 502 /* 503 * Block SCSI interrupts while emulating DMA. They come 504 * at a higher priority. 505 */ 506 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 507 508 /* 509 * Setup for a possible bus error caused by SCSI controller 510 * switching out of DATA-IN/OUT before we're done with the 511 * current transfer. 512 */ 513 nofault = &faultbuf; 514 515 if (setjmp(nofault)) { 516 u_long cnt, tmp; 517 518 PID("drq berr"); 519 nofault = NULL; 520 521 /* 522 * Determine number of bytes transferred 523 */ 524 cnt = (u_long)dma_ptr - get_scsi_dma(SCSI_DMA->s_dma_ptr); 525 526 if (cnt != 0) { 527 /* 528 * Update the DMA pointer/count fields 529 */ 530 set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 531 tmp = get_scsi_dma(SCSI_DMA->s_dma_cnt); 532 set_scsi_dma(SCSI_DMA->s_dma_cnt, tmp - cnt); 533 534 if (tmp > cnt) { 535 /* 536 * Still more to transfer 537 */ 538 if (!poll) 539 single_inst_bset_b(MFP2->mf_imra, 540 IA_SCSI); 541 return; 542 } 543 544 /* 545 * Signal EOP to 5380 546 */ 547 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 548 } else { 549 nofault = &faultbuf; 550 551 /* 552 * Try to figure out if the byte-count was 553 * zero because there was no (more) data or 554 * because the dma_ptr is bogus. 555 */ 556 if (setjmp(nofault)) { 557 /* 558 * Set the bus-error bit 559 */ 560 SCSI_DMA->s_hdma_ctrl |= SDH_BUSERR; 561 } 562 __asm volatile ("tstb %0@(0)": : "a" (dma_ptr)); 563 nofault = NULL; 564 } 565 566 /* 567 * Schedule an interrupt 568 */ 569 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 570 add_sicallback((si_farg)ncr_dma_intr, 571 (void *)cur_softc, 0); 572 573 /* 574 * Clear DMA-mode 575 */ 576 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 577 if (!poll) 578 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 579 580 return; 581 } 582 583 write = (SCSI_DMA->s_dma_ctrl & SD_OUT) ? 1 : 0; 584 #if DBG_PID 585 if (write) { 586 PID("drq (in)"); 587 } else { 588 PID("drq (out)"); 589 } 590 #endif 591 592 count = get_scsi_dma(SCSI_DMA->s_dma_cnt); 593 dma_ptr = (uint8_t *)get_scsi_dma(SCSI_DMA->s_dma_ptr); 594 595 /* 596 * Keep pushing bytes until we're done or a bus-error 597 * signals that the SCSI controller is not ready. 598 * NOTE: I tried some optimalizations in these loops, 599 * but they had no effect on transfer speed. 600 */ 601 if (write) { 602 while (count--) { 603 *data_p = *dma_ptr++; 604 } 605 } else { 606 while (count--) { 607 *dma_ptr++ = *data_p; 608 } 609 } 610 611 /* 612 * OK. No bus error occurred above. Clear the nofault flag 613 * so we no longer short-circuit bus errors. 614 */ 615 nofault = NULL; 616 617 /* 618 * Schedule an interrupt 619 */ 620 if (!poll && (SCSI_DMA->s_dma_ctrl & SD_ENABLE)) 621 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 622 623 /* 624 * Clear DMA-mode 625 */ 626 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 627 628 /* 629 * Update the DMA 'registers' to reflect that all bytes 630 * have been transferred and tell this to the 5380 too. 631 */ 632 set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 633 set_scsi_dma(SCSI_DMA->s_dma_cnt, 0); 634 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 635 636 PID("end drq"); 637 if (!poll) 638 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 639 } 640 641 #endif /* defined(TT_SCSI) */ 642 643 #if defined(FALCON_SCSI) && !defined(TT_SCSI) 644 645 #define GET_5380_REG(rnum) get_falcon_5380_reg(rnum) 646 #define SET_5380_REG(rnum,val) set_falcon_5380_reg(rnum, val) 647 #define scsi_mach_init(sc) scsi_falcon_init(sc) 648 #define scsi_ienable() scsi_falcon_ienable() 649 #define scsi_idisable() scsi_falcon_idisable() 650 #define scsi_clr_ipend() scsi_falcon_clr_ipend() 651 #define scsi_ipending() scsi_falcon_ipending() 652 #define scsi_dma_setup(r,p,m) scsi_falcon_dmasetup(r, p, m) 653 #define wrong_dma_range(r,d) falcon_wrong_dma_range(r, d) 654 #define poll_edma(reqp) falcon_poll_edma(reqp) 655 #define get_dma_result(r, b) falcon_get_dma_result(r, b) 656 #define can_access_5380() falcon_can_access_5380() 657 #define emulated_dma() 0 658 659 #define fair_to_keep_dma() (!st_dmawanted()) 660 #define claimed_dma() falcon_claimed_dma() 661 #define reconsider_dma() falcon_reconsider_dma() 662 663 #endif /* defined(FALCON_SCSI) && !defined(TT_SCSI) */ 664 665 #if defined(FALCON_SCSI) 666 667 /* 668 * Prototype functions defined below 669 */ 670 static void scsi_falcon_init(struct ncr_softc *); 671 static uint8_t get_falcon_5380_reg(u_short); 672 static void set_falcon_5380_reg(u_short, u_short); 673 static int falcon_wrong_dma_range(SC_REQ *, struct dma_chain *); 674 static void fal1_dma(u_int, u_int, SC_REQ *); 675 static void scsi_falcon_dmasetup(SC_REQ *, u_int, uint8_t); 676 static int falcon_poll_edma(SC_REQ *); 677 static int falcon_get_dma_result(SC_REQ *, u_long *); 678 679 int falcon_can_access_5380(void); 680 void scsi_falcon_clr_ipend(void); 681 void scsi_falcon_idisable(void); 682 void scsi_falcon_ienable(void); 683 int scsi_falcon_ipending(void); 684 int falcon_claimed_dma(void); 685 void falcon_reconsider_dma(void); 686 687 static void 688 scsi_falcon_init(struct ncr_softc *sc) 689 { 690 691 /* 692 * Enable disk related interrupts 693 */ 694 MFP->mf_ierb |= IB_DINT; 695 MFP->mf_iprb = (uint8_t)~IB_DINT; 696 MFP->mf_imrb |= IB_DINT; 697 } 698 699 static uint8_t 700 get_falcon_5380_reg(u_short rnum) 701 { 702 703 DMA->dma_mode = DMA_SCSI + rnum; 704 return DMA->dma_data; 705 } 706 707 static void 708 set_falcon_5380_reg(u_short rnum, u_short val) 709 { 710 711 DMA->dma_mode = DMA_SCSI + rnum; 712 DMA->dma_data = val; 713 } 714 715 static inline void 716 scsi_falcon_ienable(void) 717 { 718 719 single_inst_bset_b(MFP->mf_imrb, IB_DINT); 720 } 721 722 static inline void 723 scsi_falcon_idisable(void) 724 { 725 726 single_inst_bclr_b(MFP->mf_imrb, IB_DINT); 727 } 728 729 static inline void 730 scsi_falcon_clr_ipend(void) 731 { 732 733 (void)get_falcon_5380_reg(NCR5380_IRCV); 734 rem_sicallback((si_farg)ncr_ctrl_intr); 735 } 736 737 static inline int 738 scsi_falcon_ipending(void) 739 { 740 741 if (connected && (connected->dr_flag & DRIVER_IN_DMA)) { 742 /* 743 * XXX: When DMA is running, we are only allowed to 744 * check the 5380 when DMA _might_ be finished. 745 */ 746 if (MFP->mf_gpip & IO_DINT) 747 /* XXX: Actually: we're not allowed to check */ 748 return 0; 749 750 /* LWP: 28-06, must be a DMA interrupt! should the 751 * ST-DMA unit be taken out of DMA mode????? 752 */ 753 DMA->dma_mode = 0x90; 754 755 } 756 return get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET; 757 } 758 759 static int 760 falcon_wrong_dma_range(SC_REQ *reqp, struct dma_chain *dm) 761 { 762 763 /* 764 * Do not allow chains yet! See also comment with 765 * falcon_poll_edma() !!! 766 */ 767 if (((dm - reqp->dm_chain) > 0) || (dm->dm_addr & 0xff000000)) { 768 reqp->dr_flag |= DRIVER_BOUNCING; 769 return 1; 770 } 771 /* 772 * Never allow DMA to happen on a Falcon when the transfer 773 * size is no multiple of 512. This is the transfer unit of the 774 * ST DMA-controller. 775 */ 776 if (dm->dm_count & 511) 777 return 1; 778 return 0; 779 } 780 781 static int falcon_lock = 0; 782 783 static inline int 784 falcon_claimed_dma(void) 785 { 786 787 if (falcon_lock != DMA_LOCK_GRANT) { 788 if (falcon_lock == DMA_LOCK_REQ) { 789 /* 790 * DMA access is being claimed. 791 */ 792 return 0; 793 } 794 if (st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 795 cur_softc, &falcon_lock, 1, NULL) == 0) 796 return 0; 797 } 798 return 1; 799 } 800 801 static inline void 802 falcon_reconsider_dma(void) 803 { 804 805 if (falcon_lock && (connected == NULL) && (discon_q == NULL)) { 806 /* 807 * No need to keep DMA locked by us as we are not currently 808 * connected and no disconnected jobs are pending. 809 */ 810 rem_sicallback((si_farg)ncr_ctrl_intr); 811 st_dmafree(cur_softc, &falcon_lock); 812 } 813 814 if (!falcon_lock && (issue_q != NULL)) { 815 /* 816 * We must (re)claim DMA access as there are jobs 817 * waiting in the issue queue. 818 */ 819 st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 820 cur_softc, &falcon_lock, 0, NULL); 821 } 822 } 823 824 static void 825 fal1_dma(u_int dir, u_int nsects, SC_REQ *reqp) 826 { 827 828 dir <<= 8; 829 st_dmaaddr_set((void *)reqp->dm_cur->dm_addr); 830 DMA->dma_mode = 0x90 | dir; 831 DMA->dma_mode = 0x90 | (dir ^ DMA_WRBIT); 832 DMA->dma_mode = 0x90 | dir; 833 DMA->dma_data = nsects; 834 delay(2); /* _really_ needed (Thomas Gerner) */ 835 DMA->dma_mode = 0x10 | dir; 836 } 837 838 static void 839 scsi_falcon_dmasetup(SC_REQ *reqp, u_int phase, uint8_t mode) 840 { 841 int nsects = reqp->dm_cur->dm_count / 512; /* XXX */ 842 843 /* 844 * XXX: We should probably clear the fifo before putting the 845 * 5380 into DMA-mode. 846 */ 847 if (PH_IN(phase)) { 848 set_falcon_5380_reg(NCR5380_ICOM, 0); 849 set_falcon_5380_reg(NCR5380_MODE, mode); 850 set_falcon_5380_reg(NCR5380_IRCV, 0); 851 fal1_dma(0, nsects, reqp); 852 } else { 853 set_falcon_5380_reg(NCR5380_MODE, mode); 854 set_falcon_5380_reg(NCR5380_ICOM, SC_ADTB); 855 set_falcon_5380_reg(NCR5380_DMSTAT, 0); 856 fal1_dma(1, nsects, reqp); 857 } 858 } 859 860 static int 861 falcon_poll_edma(SC_REQ *reqp) 862 { 863 int timeout = 9000; /* XXX */ 864 865 /* 866 * Because of the Falcon hardware, it is impossible to reach 867 * the 5380 while doing DMA-transfers. So we have to rely on 868 * the interrupt line to determine if DMA-has finished. the 869 * DMA-controller itself will never fire an interrupt. This means 870 * that 'broken-up' DMA transfers are not (yet) possible on the 871 * Falcon. 872 */ 873 for (;;) { 874 delay(20); 875 if (--timeout <= 0) { 876 ncr_tprint(reqp, "Timeout on polled transfer\n"); 877 reqp->xs->error = XS_TIMEOUT; 878 return 0; 879 } 880 if ((MFP->mf_gpip & IO_DINT) == 0) 881 break; 882 } 883 return 1; 884 } 885 886 static int 887 falcon_get_dma_result(SC_REQ *reqp, u_long *bytes_left) 888 { 889 int rv = 0; 890 int st_dmastat; 891 u_long bytes_done; 892 893 /* 894 * Select sector counter register first (See Atari docu.) 895 */ 896 DMA->dma_mode = 0x90; 897 if (!(st_dmastat = DMA->dma_stat) & 0x01) { 898 /* 899 * Misc. DMA-error according to Atari... 900 */ 901 ncr_tprint(reqp, "Unknown ST-SCSI error near 0x%x\n", 902 st_dmaaddr_get()); 903 reqp->xs->error = XS_DRIVER_STUFFUP; 904 rv = 1; 905 } 906 /* 907 * Because we NEVER start DMA on the Falcon when the data size 908 * is not a multiple of 512 bytes, we can safely round down the 909 * byte count on writes. We need to because in case of a disconnect, 910 * the DMA has already prefetched the next couple of bytes. 911 * On read, these byte counts are an error. They are logged and 912 * should be handled by the mi-part of the driver. 913 * NOTE: We formerly did this by using the 'byte-count-zero' bit 914 * of the DMA controller, but this didn't seem to work??? 915 * [lwp 29/06/96] 916 */ 917 bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr; 918 if (bytes_done & 511) { 919 if (PH_IN(reqp->phase)) { 920 ncr_tprint(reqp, "Byte count on read not a multiple " 921 "of 512 (%ld)\n", bytes_done); 922 } 923 bytes_done &= ~511; 924 } 925 if ((*bytes_left = reqp->dm_cur->dm_count - bytes_done) == 0) 926 rv = 1; 927 return rv; 928 } 929 930 static int 931 falcon_can_access_5380(void) 932 { 933 934 if (connected && (connected->dr_flag & DRIVER_IN_DMA) && 935 (MFP->mf_gpip & IO_DINT)) 936 return 0; 937 return 1; 938 } 939 940 #endif /* defined(FALCON_SCSI) */ 941 942 #if defined(TT_SCSI) && defined(FALCON_SCSI) 943 /* 944 * Define some functions to support _both_ TT and Falcon SCSI 945 */ 946 947 /* 948 * The prototypes first... 949 */ 950 static void scsi_mach_init(struct ncr_softc *); 951 952 void scsi_ienable(void); 953 void scsi_idisable(void); 954 void scsi_clr_ipend(void); 955 int scsi_ipending(void); 956 void scsi_dma_setup(SC_REQ *, u_int, uint8_t); 957 int wrong_dma_range(SC_REQ *, struct dma_chain *); 958 int poll_edma(SC_REQ *); 959 int get_dma_result(SC_REQ *, u_long *); 960 int can_access_5380(void); 961 962 /* 963 * Register access will be done through the following 2 function pointers. 964 */ 965 static uint8_t (*get_5380_reg)(u_short); 966 static void (*set_5380_reg)(u_short, u_short); 967 968 #define GET_5380_REG (*get_5380_reg) 969 #define SET_5380_REG (*set_5380_reg) 970 971 static void 972 scsi_mach_init(struct ncr_softc *sc) 973 { 974 975 if (machineid & ATARI_FALCON) { 976 get_5380_reg = get_falcon_5380_reg; 977 set_5380_reg = set_falcon_5380_reg; 978 scsi_falcon_init(sc); 979 } else { 980 get_5380_reg = get_tt_5380_reg; 981 set_5380_reg = set_tt_5380_reg; 982 scsi_tt_init(sc); 983 } 984 } 985 986 static inline void 987 scsi_ienable(void) 988 { 989 990 if (machineid & ATARI_FALCON) 991 scsi_falcon_ienable(); 992 else 993 scsi_tt_ienable(); 994 } 995 996 static inline void 997 scsi_idisable(void) 998 { 999 1000 if (machineid & ATARI_FALCON) 1001 scsi_falcon_idisable(); 1002 else 1003 scsi_tt_idisable(); 1004 } 1005 1006 static inline void 1007 scsi_clr_ipend(void) 1008 { 1009 1010 if (machineid & ATARI_FALCON) 1011 scsi_falcon_clr_ipend(); 1012 else 1013 scsi_tt_clr_ipend(); 1014 } 1015 1016 static inline int 1017 scsi_ipending(void) 1018 { 1019 1020 if (machineid & ATARI_FALCON) 1021 return scsi_falcon_ipending(); 1022 else 1023 return GET_TT_REG(NCR5380_DMSTAT) & SC_IRQ_SET; 1024 } 1025 1026 static inline void 1027 scsi_dma_setup(SC_REQ *reqp, u_int phase, uint8_t mbase) 1028 { 1029 1030 if (machineid & ATARI_FALCON) 1031 scsi_falcon_dmasetup(reqp, phase, mbase); 1032 else 1033 scsi_tt_dmasetup(reqp, phase, mbase); 1034 } 1035 1036 static inline int 1037 wrong_dma_range(SC_REQ *reqp, struct dma_chain *dm) 1038 { 1039 1040 if (machineid & ATARI_FALCON) 1041 return falcon_wrong_dma_range(reqp, dm); 1042 else 1043 return tt_wrong_dma_range(reqp, dm); 1044 } 1045 1046 static inline int 1047 poll_edma(SC_REQ *reqp) 1048 { 1049 1050 if (machineid & ATARI_FALCON) 1051 return falcon_poll_edma(reqp); 1052 else 1053 return tt_poll_edma(reqp); 1054 } 1055 1056 static inline int 1057 get_dma_result(SC_REQ *reqp, u_long *bytes_left) 1058 { 1059 1060 if (machineid & ATARI_FALCON) 1061 return falcon_get_dma_result(reqp, bytes_left); 1062 else 1063 return tt_get_dma_result(reqp, bytes_left); 1064 } 1065 1066 static inline int 1067 can_access_5380(void) 1068 { 1069 1070 if (machineid & ATARI_FALCON) 1071 return falcon_can_access_5380(); 1072 return 1; 1073 } 1074 1075 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 1076 1077 /* 1078 * Locking stuff. All turns into NOP's on the TT. 1079 */ 1080 #define fair_to_keep_dma() \ 1081 ((machineid & ATARI_FALCON) ? !st_dmawanted() : 1) 1082 #define claimed_dma() \ 1083 ((machineid & ATARI_FALCON) ? falcon_claimed_dma() : 1) 1084 #define reconsider_dma() \ 1085 do { \ 1086 if (machineid & ATARI_FALCON) \ 1087 falcon_reconsider_dma(); \ 1088 } while (/* CONSTCOND */ 0) 1089 #endif /* defined(TT_SCSI) && defined(FALCON_SCSI) */ 1090 1091 /********************************************** 1092 * Functions present for both TT and Falcon. * 1093 **********************************************/ 1094 /* 1095 * Our autoconfig matching function 1096 */ 1097 static int 1098 machine_match(device_t parent, cfdata_t cf, void *aux, struct cfdriver *cd) 1099 { 1100 static int we_matched = 0; /* Only one unit */ 1101 1102 if (strcmp(aux, cd->cd_name) || we_matched) 1103 return 0; 1104 1105 we_matched = 1; 1106 return 1; 1107 } 1108 1109 /* 1110 * Bounce buffer (de)allocation. Those buffers are gotten from the ST-mem 1111 * pool. Allocation here is both contiguous and in the lower 16Mb of 1112 * the address space. Thus being DMA-able for all controllers. 1113 */ 1114 static uint8_t * 1115 alloc_bounceb(u_long len) 1116 { 1117 void *tmp; 1118 1119 return (uint8_t *)alloc_stmem(len, &tmp); 1120 } 1121 1122 static void 1123 free_bounceb(uint8_t *bounceb) 1124 { 1125 1126 free_stmem(bounceb); 1127 } 1128 1129 /* 1130 * 5380 interrupt. 1131 */ 1132 void 1133 scsi_ctrl(int sr) 1134 { 1135 1136 if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) { 1137 scsi_idisable(); 1138 add_sicallback((si_farg)ncr_ctrl_intr, (void *)cur_softc, 0); 1139 } 1140 } 1141 1142 /* 1143 * DMA controller interrupt 1144 */ 1145 void 1146 scsi_dma(int sr) 1147 { 1148 SC_REQ *reqp; 1149 1150 if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) { 1151 scsi_idisable(); 1152 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 1153 } 1154 } 1155 1156 /* 1157 * Last but not least... Include the general driver code 1158 */ 1159 #include <atari/dev/ncr5380.c> 1160
Indexes created Sun Oct 25 00:26:45 UTC 2026