atari5380.c revision 1.26.2.1
1 /* $NetBSD: atari5380.c,v 1.26.2.1 1997/07/01 17:33:51 bouyer 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 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Leo Weppelman. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 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 <m68k/asm_single.h> 44 #include <m68k/cpu.h> 45 #include <m68k/cacheops.h> 46 47 #include <atari/atari/stalloc.h> 48 49 /* 50 * Include the driver definitions 51 */ 52 #include <atari/dev/ncr5380reg.h> 53 54 #include <machine/stdarg.h> 55 #include <machine/iomap.h> 56 #include <machine/mfp.h> 57 58 #include <atari/atari/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 u_char *alloc_bounceb __P((u_long)); 101 static void free_bounceb __P((u_char *)); 102 static int machine_match __P((struct device *, void *, void *, 103 struct cfdriver *)); 104 void scsi_ctrl __P((int)); 105 void scsi_dma __P((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 __P((void)); 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 u_char s_dma_ptr[8]; /* use only the odd bytes */ 124 volatile u_char s_dma_cnt[8]; /* use only the odd bytes */ 125 volatile u_char s_dma_res[4]; /* data residue register */ 126 volatile u_char s_dma_gap; /* not used */ 127 volatile u_char s_dma_ctrl; /* control register */ 128 volatile u_char s_dma_gap2; /* not used */ 129 volatile u_char s_hdma_ctrl; /* Hades control register */ 130 }; 131 132 #define set_scsi_dma(addr, val) (void)( \ 133 { \ 134 u_char *address = (u_char*)addr+1; \ 135 u_long nval = (u_long)val; \ 136 __asm("movepl %0, %1@(0)": :"d" (nval), "a" (address)); \ 137 }) 138 139 #define get_scsi_dma(addr, res) ( \ 140 { \ 141 u_char *address = (u_char*)addr+1; \ 142 u_long nval; \ 143 __asm("movepl %1@(0), %0": "=d" (nval) : "a" (address)); \ 144 res = (u_long)nval; \ 145 }) 146 147 /* 148 * Defines for TT-DMA control register 149 */ 150 #define SD_BUSERR 0x80 /* 1 = transfer caused bus error*/ 151 #define SD_ZERO 0x40 /* 1 = byte counter is zero */ 152 #define SD_ENABLE 0x02 /* 1 = Enable DMA */ 153 #define SD_OUT 0x01 /* Direction: memory to SCSI */ 154 #define SD_IN 0x00 /* Direction: SCSI to memory */ 155 156 /* 157 * Defines for Hades-DMA control register 158 */ 159 #define SDH_BUSERR 0x02 /* 1 = Bus error */ 160 #define SDH_EOP 0x01 /* 1 = Signal EOP on 5380 */ 161 #define SDH_ZERO 0x40 /* 1 = Byte counter is zero */ 162 163 /* 164 * Define the 5380 register set 165 */ 166 struct scsi_5380 { 167 volatile u_char scsi_5380[16]; /* use only the odd bytes */ 168 }; 169 #endif /* TT_SCSI */ 170 171 /********************************************** 172 * Variables present for both TT and Falcon. * 173 **********************************************/ 174 175 /* 176 * Softc of currently active controller (a bit of fake; we only have one) 177 */ 178 static struct ncr_softc *cur_softc; 179 180 #if defined(TT_SCSI) && !defined(FALCON_SCSI) 181 /* 182 * We can be more efficient for some functions when only TT_SCSI is selected 183 */ 184 #define GET_5380_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 185 #define SET_5380_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 186 187 #define scsi_mach_init(sc) scsi_tt_init(sc) 188 #define scsi_ienable() scsi_tt_ienable() 189 #define scsi_idisable() scsi_tt_idisable() 190 #define scsi_clr_ipend() scsi_tt_clr_ipend() 191 #define scsi_ipending() (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) 192 #define scsi_dma_setup(r,p,m) scsi_tt_dmasetup(r, p, m) 193 #define wrong_dma_range(r,d) tt_wrong_dma_range(r, d) 194 #define poll_edma(reqp) tt_poll_edma(reqp) 195 #define get_dma_result(r, b) tt_get_dma_result(r, b) 196 #define can_access_5380() 1 197 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 198 199 #define fair_to_keep_dma() 1 200 #define claimed_dma() 1 201 #define reconsider_dma() 202 203 #endif /* defined(TT_SCSI) && !defined(FALCON_SCSI) */ 204 205 #if defined(TT_SCSI) 206 207 /* 208 * Prototype functions defined below 209 */ 210 #ifdef NO_TTRAM_DMA 211 static int tt_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 212 #endif 213 static void scsi_tt_init __P((struct ncr_softc *)); 214 static u_char get_tt_5380_reg __P((u_short)); 215 static void set_tt_5380_reg __P((u_short, u_short)); 216 static void scsi_tt_dmasetup __P((SC_REQ *, u_int, u_char)); 217 static int tt_poll_edma __P((SC_REQ *)); 218 static u_char *ptov __P((SC_REQ *, u_long*)); 219 static int tt_get_dma_result __P((SC_REQ *, u_long *)); 220 void scsi_tt_ienable __P((void)); 221 void scsi_tt_idisable __P((void)); 222 void scsi_tt_clr_ipend __P((void)); 223 224 /* 225 * Define these too, so we can use them locally... 226 */ 227 #define GET_TT_REG(rnum) SCSI_5380->scsi_5380[(rnum << 1) | 1] 228 #define SET_TT_REG(rnum,val) (SCSI_5380->scsi_5380[(rnum << 1) | 1] = val) 229 230 #ifdef NO_TTRAM_DMA 231 static int 232 tt_wrong_dma_range(reqp, dm) 233 SC_REQ *reqp; 234 struct dma_chain *dm; 235 { 236 if (dm->dm_addr & 0xff000000) { 237 reqp->dr_flag |= DRIVER_BOUNCING; 238 return(1); 239 } 240 return(0); 241 } 242 #else 243 #define tt_wrong_dma_range(reqp, dm) 0 244 #endif 245 246 static void 247 scsi_tt_init(struct ncr_softc *sc) 248 { 249 /* 250 * Enable SCSI-related interrupts 251 */ 252 MFP2->mf_aer |= 0x80; /* SCSI IRQ goes HIGH!!!!! */ 253 254 if (machineid & ATARI_TT) { 255 /* SCSI-dma interrupts */ 256 MFP2->mf_ierb |= IB_SCDM; 257 MFP2->mf_iprb &= ~IB_SCDM; 258 MFP2->mf_imrb |= IB_SCDM; 259 } 260 else if (machineid & ATARI_HADES) { 261 SCSI_DMA->s_hdma_ctrl = 0; 262 263 if (intr_establish(2, AUTO_VEC, 0, 264 (hw_ifun_t)ncr5380_drq_intr, 265 NULL) == NULL) 266 panic("scsi_tt_init: Can't establish drq-interrupt"); 267 } 268 else panic("scsi_tt_init: should not come here"); 269 270 MFP2->mf_iera |= IA_SCSI; /* SCSI-5380 interrupts */ 271 MFP2->mf_ipra &= ~IA_SCSI; 272 MFP2->mf_imra |= IA_SCSI; 273 274 /* 275 * LWP: DMA transfers to TT-ram causes data to be garbeled 276 * without notice on some revisons of the TT-mainboard. 277 * When program's generate misterious Segmentations faults, 278 * try turning on NO_TTRAM_DMA. 279 */ 280 #ifdef NO_TTRAM_DMA 281 printf(": DMA to TT-RAM is disabled!"); 282 #endif 283 } 284 285 static u_char 286 get_tt_5380_reg(u_short rnum) 287 { 288 return(SCSI_5380->scsi_5380[(rnum << 1) | 1]); 289 } 290 291 static void 292 set_tt_5380_reg(u_short rnum, u_short val) 293 { 294 SCSI_5380->scsi_5380[(rnum << 1) | 1] = val; 295 } 296 297 extern __inline__ void 298 scsi_tt_ienable(void) 299 { 300 if (machineid & ATARI_TT) 301 single_inst_bset_b(MFP2->mf_imrb, IB_SCDM); 302 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 303 } 304 305 extern __inline__ void 306 scsi_tt_idisable(void) 307 { 308 if (machineid & ATARI_TT) 309 single_inst_bclr_b(MFP2->mf_imrb, IB_SCDM); 310 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 311 } 312 313 extern __inline__ void 314 scsi_tt_clr_ipend(void) 315 { 316 int tmp; 317 318 SCSI_DMA->s_dma_ctrl = 0; 319 tmp = GET_TT_REG(NCR5380_IRCV); 320 if (machineid & ATARI_TT) 321 single_inst_bclr_b(MFP2->mf_iprb, IB_SCDM); 322 single_inst_bclr_b(MFP2->mf_ipra, IA_SCSI); 323 324 /* 325 * Remove interrupts already scheduled. 326 */ 327 rem_sicallback((si_farg)ncr_ctrl_intr); 328 rem_sicallback((si_farg)ncr_dma_intr); 329 } 330 331 static void 332 scsi_tt_dmasetup(SC_REQ *reqp, u_int phase, u_char mode) 333 { 334 if (PH_IN(phase)) { 335 SCSI_DMA->s_dma_ctrl = SD_IN; 336 if (machineid & ATARI_HADES) 337 SCSI_DMA->s_hdma_ctrl &= ~(SDH_BUSERR|SDH_EOP); 338 set_scsi_dma(&(SCSI_DMA->s_dma_ptr), reqp->dm_cur->dm_addr); 339 set_scsi_dma(&(SCSI_DMA->s_dma_cnt), reqp->dm_cur->dm_count); 340 SET_TT_REG(NCR5380_ICOM, 0); 341 SET_TT_REG(NCR5380_MODE, mode); 342 SCSI_DMA->s_dma_ctrl = SD_ENABLE; 343 SET_TT_REG(NCR5380_IRCV, 0); 344 } 345 else { 346 SCSI_DMA->s_dma_ctrl = SD_OUT; 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_MODE, mode); 352 SET_TT_REG(NCR5380_ICOM, SC_ADTB); 353 SET_TT_REG(NCR5380_DMSTAT, 0); 354 SCSI_DMA->s_dma_ctrl = SD_ENABLE|SD_OUT; 355 } 356 } 357 358 static int 359 tt_poll_edma(SC_REQ *reqp) 360 { 361 u_char dmstat, dmastat; 362 int timeout = 9000; /* XXX */ 363 364 /* 365 * We wait here until the DMA has finished. This can be 366 * achieved by checking the following conditions: 367 * - 5380: 368 * - End of DMA flag is set 369 * - We lost BSY (error!!) 370 * - A phase mismatch has occured (partial transfer) 371 * - DMA-controller: 372 * - A bus error occurred (Kernel error!!) 373 * - All bytes are transferred 374 * If one of the terminating conditions was met, we call 375 * 'dma_ready' to check errors and perform the bookkeeping. 376 */ 377 378 for (;;) { 379 delay(20); 380 if (--timeout <= 0) { 381 ncr_tprint(reqp, "timeout on polled transfer\n"); 382 reqp->xs->error = XS_TIMEOUT; 383 return(0); 384 } 385 dmstat = GET_TT_REG(NCR5380_DMSTAT); 386 387 if ((machineid & ATARI_HADES) && (dmstat & SC_DMA_REQ)) { 388 ncr5380_drq_intr(); 389 dmstat = GET_TT_REG(NCR5380_DMSTAT); 390 } 391 392 dmastat = SCSI_DMA->s_dma_ctrl; 393 if (dmstat & (SC_END_DMA|SC_BSY_ERR|SC_IRQ_SET)) 394 break; 395 if (!(dmstat & SC_PHS_MTCH)) 396 break; 397 if (dmastat & (SD_BUSERR|SD_ZERO)) 398 break; 399 } 400 return(1); 401 } 402 403 /* 404 * Convert physical DMA address to a virtual address. 405 */ 406 static u_char * 407 ptov(SC_REQ *reqp, u_long *phaddr) 408 { 409 struct dma_chain *dm; 410 u_char *vaddr; 411 412 dm = reqp->dm_chain; 413 vaddr = reqp->xdata_ptr; 414 for(; dm < reqp->dm_cur; dm++) 415 vaddr += dm->dm_count; 416 vaddr += (u_long)phaddr - dm->dm_addr; 417 return(vaddr); 418 } 419 420 static int 421 tt_get_dma_result(SC_REQ *reqp, u_long *bytes_left) 422 { 423 int dmastat, dmstat; 424 u_char *byte_p; 425 u_long leftover; 426 427 dmastat = SCSI_DMA->s_dma_ctrl; 428 dmstat = GET_TT_REG(NCR5380_DMSTAT); 429 get_scsi_dma(SCSI_DMA->s_dma_cnt, leftover); 430 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)byte_p); 431 432 if (dmastat & SD_BUSERR) { 433 /* 434 * The DMA-controller seems to access 8 bytes beyond 435 * it's limits on output. Therefore check also the byte 436 * count. If it's zero, ignore the bus error. 437 */ 438 if (leftover != 0) { 439 ncr_tprint(reqp, 440 "SCSI-DMA buserror - accessing 0x%x\n", byte_p); 441 reqp->xs->error = XS_DRIVER_STUFFUP; 442 } 443 } 444 445 /* 446 * We handle the following special condition below: 447 * -- The device disconnects in the middle of a write operation -- 448 * In this case, the 5380 has already pre-fetched the next byte from 449 * the DMA-controller before the phase mismatch occurs. Therefore, 450 * leftover is 1 too low. 451 * This does not always happen! Therefore, we only do this when 452 * leftover is odd. This assumes that DMA transfers are _even_! This 453 * is normally the case on disks and types but might not always be. 454 * XXX: Check if ACK is consistently high on these occasions LWP 455 */ 456 if ((leftover & 1) && !(dmstat & SC_PHS_MTCH) && PH_OUT(reqp->phase)) 457 leftover++; 458 459 /* 460 * Check if there are some 'restbytes' left in the DMA-controller. 461 */ 462 if ((machineid & ATARI_TT) && ((u_long)byte_p & 3) 463 && PH_IN(reqp->phase)) { 464 u_char *p, *q; 465 466 p = ptov(reqp, (u_long *)((u_long)byte_p & ~3)); 467 q = (u_char*)&(SCSI_DMA->s_dma_res); 468 switch ((u_long)byte_p & 3) { 469 case 3: *p++ = *q++; 470 case 2: *p++ = *q++; 471 case 1: *p++ = *q++; 472 } 473 } 474 *bytes_left = leftover; 475 return ((dmastat & (SD_BUSERR|SD_ZERO)) ? 1 : 0); 476 } 477 478 static u_char *dma_ptr; 479 void 480 ncr5380_drq_intr() 481 { 482 extern int *nofault; 483 label_t faultbuf; 484 int write; 485 u_long count; 486 u_char *data_p = (u_char*)(stio_addr+0x741); 487 488 /* 489 * Block SCSI interrupts while emulating DMA. They come 490 * at a higher priority. 491 */ 492 single_inst_bclr_b(MFP2->mf_imra, IA_SCSI); 493 494 /* 495 * Setup for a possible bus error caused by SCSI controller 496 * switching out of DATA-IN/OUT before we're done with the 497 * current transfer. 498 */ 499 nofault = (int *) &faultbuf; 500 501 if (setjmp((label_t *) nofault)) { 502 u_char *ptr; 503 u_long cnt, tmp; 504 505 PID("drq berr"); 506 nofault = (int *) 0; 507 508 /* 509 * Determine number of bytes transferred 510 */ 511 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)ptr); 512 cnt = dma_ptr - ptr; 513 514 if (cnt != 0) { 515 /* 516 * Update the dma pointer/count fields 517 */ 518 set_scsi_dma(SCSI_DMA->s_dma_ptr, dma_ptr); 519 get_scsi_dma(SCSI_DMA->s_dma_cnt, tmp); 520 set_scsi_dma(SCSI_DMA->s_dma_cnt, tmp - cnt); 521 522 if (tmp > cnt) { 523 /* 524 * Still more to transfer 525 */ 526 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 527 return; 528 } 529 530 /* 531 * Signal EOP to 5380 532 */ 533 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 534 } 535 else { 536 nofault = (int *) &faultbuf; 537 538 /* 539 * Try to figure out if the byte-count was 540 * zero because there was no (more) data or 541 * because the dma_ptr is bogus. 542 */ 543 if (setjmp((label_t *) nofault)) { 544 /* 545 * Set the bus-error bit 546 */ 547 SCSI_DMA->s_hdma_ctrl |= SDH_BUSERR; 548 } 549 __asm __volatile ("tstb %0@(0)": : "a" (dma_ptr)); 550 nofault = (int *)0; 551 } 552 553 /* 554 * Schedule an interrupt 555 */ 556 if (SCSI_DMA->s_dma_ctrl & SD_ENABLE) 557 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 558 559 /* 560 * Clear DMA-mode 561 */ 562 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 563 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 564 565 return; 566 } 567 568 write = (SCSI_DMA->s_dma_ctrl & SD_OUT) ? 1 : 0; 569 #if DBG_PID 570 if (write) { 571 PID("drq (in)"); 572 } else { 573 PID("drq (out)"); 574 } 575 #endif 576 577 get_scsi_dma(SCSI_DMA->s_dma_cnt, count); 578 get_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 579 580 /* 581 * Keep pushing bytes until we're done or a bus-error 582 * signals that the SCSI controller is not ready. 583 * NOTE: I tried some optimalizations in these loops, 584 * but they had no effect on transfer speed. 585 */ 586 if (write) { 587 while(count--) { 588 *data_p = *dma_ptr++; 589 } 590 } 591 else { 592 while(count--) { 593 *dma_ptr++ = *data_p; 594 } 595 } 596 597 /* 598 * Schedule an interrupt 599 */ 600 if (SCSI_DMA->s_dma_ctrl & SD_ENABLE) 601 add_sicallback((si_farg)ncr_dma_intr, (void *)cur_softc, 0); 602 603 /* 604 * Clear DMA-mode 605 */ 606 SCSI_DMA->s_dma_ctrl &= ~SD_ENABLE; 607 608 /* 609 * OK. No bus error occurred above. Clear the nofault flag 610 * so we no longer short-circuit bus errors. 611 */ 612 nofault = (int *) 0; 613 614 /* 615 * Update the DMA 'registers' to reflect that all bytes 616 * have been transfered and tell this to the 5380 too. 617 */ 618 set_scsi_dma(SCSI_DMA->s_dma_ptr, (u_long)dma_ptr); 619 set_scsi_dma(SCSI_DMA->s_dma_cnt, 0); 620 SCSI_DMA->s_hdma_ctrl |= SDH_EOP; 621 622 PID("end drq"); 623 single_inst_bset_b(MFP2->mf_imra, IA_SCSI); 624 625 return; 626 } 627 628 #endif /* defined(TT_SCSI) */ 629 630 #if defined(FALCON_SCSI) && !defined(TT_SCSI) 631 632 #define GET_5380_REG(rnum) get_falcon_5380_reg(rnum) 633 #define SET_5380_REG(rnum,val) set_falcon_5380_reg(rnum, val) 634 #define scsi_mach_init(sc) scsi_falcon_init(sc) 635 #define scsi_ienable() scsi_falcon_ienable() 636 #define scsi_idisable() scsi_falcon_idisable() 637 #define scsi_clr_ipend() scsi_falcon_clr_ipend() 638 #define scsi_ipending() scsi_falcon_ipending() 639 #define scsi_dma_setup(r,p,m) scsi_falcon_dmasetup(r, p, m) 640 #define wrong_dma_range(r,d) falcon_wrong_dma_range(r, d) 641 #define poll_edma(reqp) falcon_poll_edma(reqp) 642 #define get_dma_result(r, b) falcon_get_dma_result(r, b) 643 #define can_access_5380() falcon_can_access_5380() 644 #define emulated_dma() 0 645 646 #define fair_to_keep_dma() (!st_dmawanted()) 647 #define claimed_dma() falcon_claimed_dma() 648 #define reconsider_dma() falcon_reconsider_dma() 649 650 #endif /* defined(FALCON_SCSI) && !defined(TT_SCSI) */ 651 652 #if defined(FALCON_SCSI) 653 654 /* 655 * Prototype functions defined below 656 */ 657 static void scsi_falcon_init __P((struct ncr_softc *)); 658 static u_char get_falcon_5380_reg __P((u_short)); 659 static void set_falcon_5380_reg __P((u_short, u_short)); 660 static int falcon_wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 661 static void fal1_dma __P((u_int, u_int, SC_REQ *)); 662 static void scsi_falcon_dmasetup __P((SC_REQ *, u_int, u_char)); 663 static int falcon_poll_edma __P((SC_REQ *)); 664 static int falcon_get_dma_result __P((SC_REQ *, u_long *)); 665 int falcon_can_access_5380 __P((void)); 666 void scsi_falcon_clr_ipend __P((void)); 667 void scsi_falcon_idisable __P((void)); 668 void scsi_falcon_ienable __P((void)); 669 int scsi_falcon_ipending __P((void)); 670 int falcon_claimed_dma __P((void)); 671 void falcon_reconsider_dma __P((void)); 672 673 static void 674 scsi_falcon_init(sc) 675 struct ncr_softc *sc; 676 { 677 /* 678 * Enable disk related interrupts 679 */ 680 MFP->mf_ierb |= IB_DINT; 681 MFP->mf_iprb &= ~IB_DINT; 682 MFP->mf_imrb |= IB_DINT; 683 } 684 685 static u_char 686 get_falcon_5380_reg(rnum) 687 u_short rnum; 688 { 689 DMA->dma_mode = DMA_SCSI + rnum; 690 return(DMA->dma_data); 691 } 692 693 static void 694 set_falcon_5380_reg(rnum, val) 695 u_short rnum, val; 696 { 697 DMA->dma_mode = DMA_SCSI + rnum; 698 DMA->dma_data = val; 699 } 700 701 extern __inline__ void 702 scsi_falcon_ienable() 703 { 704 single_inst_bset_b(MFP->mf_imrb, IB_DINT); 705 } 706 707 extern __inline__ void 708 scsi_falcon_idisable() 709 { 710 single_inst_bclr_b(MFP->mf_imrb, IB_DINT); 711 } 712 713 extern __inline__ void 714 scsi_falcon_clr_ipend() 715 { 716 int tmp; 717 718 tmp = get_falcon_5380_reg(NCR5380_IRCV); 719 rem_sicallback((si_farg)ncr_ctrl_intr); 720 } 721 722 extern __inline__ int 723 scsi_falcon_ipending() 724 { 725 if (connected && (connected->dr_flag & DRIVER_IN_DMA)) { 726 /* 727 * XXX: When DMA is running, we are only allowed to 728 * check the 5380 when DMA _might_ be finished. 729 */ 730 if (MFP->mf_gpip & IO_DINT) 731 return (0); /* XXX: Actually: we're not allowed to check */ 732 733 /* LWP: 28-06, must be a dma interrupt! should the 734 * ST-DMA unit be taken out of dma mode????? 735 */ 736 DMA->dma_mode = 0x90; 737 738 } 739 return(get_falcon_5380_reg(NCR5380_DMSTAT) & SC_IRQ_SET); 740 } 741 742 static int 743 falcon_wrong_dma_range(reqp, dm) 744 SC_REQ *reqp; 745 struct dma_chain *dm; 746 { 747 /* 748 * Do not allow chains yet! See also comment with 749 * falcon_poll_edma() !!! 750 */ 751 if (((dm - reqp->dm_chain) > 0) || (dm->dm_addr & 0xff000000)) { 752 reqp->dr_flag |= DRIVER_BOUNCING; 753 return(1); 754 } 755 /* 756 * Never allow DMA to happen on a Falcon when the transfer 757 * size is no multiple of 512. This is the transfer unit of the 758 * ST DMA-controller. 759 */ 760 if(dm->dm_count & 511) 761 return(1); 762 return(0); 763 } 764 765 static int falcon_lock = 0; 766 767 extern __inline__ int 768 falcon_claimed_dma() 769 { 770 if (falcon_lock != DMA_LOCK_GRANT) { 771 if (falcon_lock == DMA_LOCK_REQ) { 772 /* 773 * DMA access is being claimed. 774 */ 775 return(0); 776 } 777 if (!st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 778 cur_softc, &falcon_lock, 1)) 779 return(0); 780 } 781 return(1); 782 } 783 784 extern __inline__ void 785 falcon_reconsider_dma() 786 { 787 if (falcon_lock && (connected == NULL) && (discon_q == NULL)) { 788 /* 789 * No need to keep DMA locked by us as we are not currently 790 * connected and no disconnected jobs are pending. 791 */ 792 rem_sicallback((si_farg)ncr_ctrl_intr); 793 st_dmafree(cur_softc, &falcon_lock); 794 } 795 796 if (!falcon_lock && (issue_q != NULL)) { 797 /* 798 * We must (re)claim DMA access as there are jobs 799 * waiting in the issue queue. 800 */ 801 st_dmagrab((dma_farg)ncr_ctrl_intr, (dma_farg)run_main, 802 cur_softc, &falcon_lock, 0); 803 } 804 } 805 806 static void 807 fal1_dma(dir, nsects, reqp) 808 u_int dir, nsects; 809 SC_REQ *reqp; 810 { 811 dir <<= 8; 812 st_dmaaddr_set((caddr_t)reqp->dm_cur->dm_addr); 813 DMA->dma_mode = 0x90 | dir; 814 DMA->dma_mode = 0x90 | (dir ^ DMA_WRBIT); 815 DMA->dma_mode = 0x90 | dir; 816 DMA->dma_data = nsects; 817 delay(2); /* _really_ needed (Thomas Gerner) */ 818 DMA->dma_mode = 0x10 | dir; 819 } 820 821 static void 822 scsi_falcon_dmasetup(reqp, phase, mode) 823 SC_REQ *reqp; 824 u_int phase; 825 u_char mode; 826 { 827 int nsects = reqp->dm_cur->dm_count / 512; /* XXX */ 828 829 /* 830 * XXX: We should probably clear the fifo before putting the 831 * 5380 into DMA-mode. 832 */ 833 if (PH_IN(phase)) { 834 set_falcon_5380_reg(NCR5380_ICOM, 0); 835 set_falcon_5380_reg(NCR5380_MODE, mode); 836 set_falcon_5380_reg(NCR5380_IRCV, 0); 837 fal1_dma(0, nsects, reqp); 838 } 839 else { 840 set_falcon_5380_reg(NCR5380_MODE, mode); 841 set_falcon_5380_reg(NCR5380_ICOM, SC_ADTB); 842 set_falcon_5380_reg(NCR5380_DMSTAT, 0); 843 fal1_dma(1, nsects, reqp); 844 } 845 } 846 847 static int 848 falcon_poll_edma(reqp) 849 SC_REQ *reqp; 850 { 851 int timeout = 9000; /* XXX */ 852 853 /* 854 * Because of the Falcon hardware, it is impossible to reach 855 * the 5380 while doing DMA-transfers. So we have to rely on 856 * the interrupt line to determine if DMA-has finished. the 857 * DMA-controller itself will never fire an interrupt. This means 858 * that 'broken-up' DMA transfers are not (yet) possible on the 859 * Falcon. 860 */ 861 for (;;) { 862 delay(20); 863 if (--timeout <= 0) { 864 ncr_tprint(reqp, "Timeout on polled transfer\n"); 865 reqp->xs->error = XS_TIMEOUT; 866 return(0); 867 } 868 if (!(MFP->mf_gpip & IO_DINT)) 869 break; 870 } 871 return(1); 872 } 873 874 static int 875 falcon_get_dma_result(reqp, bytes_left) 876 SC_REQ *reqp; 877 u_long *bytes_left; 878 { 879 int rv = 0; 880 int st_dmastat; 881 u_long bytes_done; 882 883 /* 884 * Select sector counter register first (See Atari docu.) 885 */ 886 DMA->dma_mode = 0x90; 887 if (!(st_dmastat = DMA->dma_stat) & 0x01) { 888 /* 889 * Misc. DMA-error according to Atari... 890 */ 891 ncr_tprint(reqp, "Unknow ST-SCSI error near 0x%x\n", 892 st_dmaaddr_get()); 893 reqp->xs->error = XS_DRIVER_STUFFUP; 894 rv = 1; 895 } 896 /* 897 * Because we NEVER start DMA on the Falcon when the data size 898 * is not a multiple of 512 bytes, we can safely round down the 899 * byte count on writes. We need to because in case of a disconnect, 900 * the DMA has already prefetched the next couple of bytes. 901 * On read, these byte counts are an error. They are logged and 902 * should be handled by the mi-part of the driver. 903 * NOTE: We formerly did this by using the 'byte-count-zero' bit 904 * of the DMA controller, but this didn't seem to work??? 905 * [lwp 29/06/96] 906 */ 907 bytes_done = st_dmaaddr_get() - reqp->dm_cur->dm_addr; 908 if (bytes_done & 511) { 909 if (PH_IN(reqp->phase)) { 910 ncr_tprint(reqp, "Byte count on read not a multiple " 911 "of 512 (%ld)\n", bytes_done); 912 } 913 bytes_done &= ~511; 914 } 915 if ((*bytes_left = reqp->dm_cur->dm_count - bytes_done) == 0) 916 rv = 1; 917 return(rv); 918 } 919 920 static int 921 falcon_can_access_5380() 922 { 923 if (connected && (connected->dr_flag & DRIVER_IN_DMA) 924 && (MFP->mf_gpip & IO_DINT)) 925 return(0); 926 return(1); 927 } 928 929 #endif /* defined(FALCON_SCSI) */ 930 931 #if defined(TT_SCSI) && defined(FALCON_SCSI) 932 /* 933 * Define some functions to support _both_ TT and Falcon SCSI 934 */ 935 936 /* 937 * The prototypes first... 938 */ 939 static void scsi_mach_init __P((struct ncr_softc *)); 940 void scsi_ienable __P((void)); 941 void scsi_idisable __P((void)); 942 void scsi_clr_ipend __P((void)); 943 int scsi_ipending __P((void)); 944 void scsi_dma_setup __P((SC_REQ *, u_int, u_char)); 945 int wrong_dma_range __P((SC_REQ *, struct dma_chain *)); 946 int poll_edma __P((SC_REQ *)); 947 int get_dma_result __P((SC_REQ *, u_long *)); 948 int can_access_5380 __P((void)); 949 950 /* 951 * Register access will be done through the following 2 function pointers. 952 */ 953 static u_char (*get_5380_reg) __P((u_short)); 954 static void (*set_5380_reg) __P((u_short, u_short)); 955 956 #define GET_5380_REG (*get_5380_reg) 957 #define SET_5380_REG (*set_5380_reg) 958 959 static void 960 scsi_mach_init(sc) 961 struct ncr_softc *sc; 962 { 963 if (machineid & ATARI_FALCON) { 964 get_5380_reg = get_falcon_5380_reg; 965 set_5380_reg = set_falcon_5380_reg; 966 scsi_falcon_init(sc); 967 } 968 else { 969 get_5380_reg = get_tt_5380_reg; 970 set_5380_reg = set_tt_5380_reg; 971 scsi_tt_init(sc); 972 } 973 } 974 975 extern __inline__ void 976 scsi_ienable() 977 { 978 if (machineid & ATARI_FALCON) 979 scsi_falcon_ienable(); 980 else scsi_tt_ienable(); 981 } 982 983 extern __inline__ void 984 scsi_idisable() 985 { 986 if (machineid & ATARI_FALCON) 987 scsi_falcon_idisable(); 988 else scsi_tt_idisable(); 989 } 990 991 extern __inline__ void 992 scsi_clr_ipend() 993 { 994 if (machineid & ATARI_FALCON) 995 scsi_falcon_clr_ipend(); 996 else scsi_tt_clr_ipend(); 997 } 998 999 extern __inline__ int 1000 scsi_ipending() 1001 { 1002 if (machineid & ATARI_FALCON) 1003 return(scsi_falcon_ipending()); 1004 else return (GET_TT_REG(NCR5380_DMSTAT) & SC_IRQ_SET); 1005 } 1006 1007 extern __inline__ void 1008 scsi_dma_setup(reqp, phase, mbase) 1009 SC_REQ *reqp; 1010 u_int phase; 1011 u_char mbase; 1012 { 1013 if (machineid & ATARI_FALCON) 1014 scsi_falcon_dmasetup(reqp, phase, mbase); 1015 else scsi_tt_dmasetup(reqp, phase, mbase); 1016 } 1017 1018 extern __inline__ int 1019 wrong_dma_range(reqp, dm) 1020 SC_REQ *reqp; 1021 struct dma_chain *dm; 1022 { 1023 if (machineid & ATARI_FALCON) 1024 return(falcon_wrong_dma_range(reqp, dm)); 1025 else return(tt_wrong_dma_range(reqp, dm)); 1026 } 1027 1028 extern __inline__ int 1029 poll_edma(reqp) 1030 SC_REQ *reqp; 1031 { 1032 if (machineid & ATARI_FALCON) 1033 return(falcon_poll_edma(reqp)); 1034 else return(tt_poll_edma(reqp)); 1035 } 1036 1037 extern __inline__ int 1038 get_dma_result(reqp, bytes_left) 1039 SC_REQ *reqp; 1040 u_long *bytes_left; 1041 { 1042 if (machineid & ATARI_FALCON) 1043 return(falcon_get_dma_result(reqp, bytes_left)); 1044 else return(tt_get_dma_result(reqp, bytes_left)); 1045 } 1046 1047 extern __inline__ int 1048 can_access_5380() 1049 { 1050 if (machineid & ATARI_FALCON) 1051 return(falcon_can_access_5380()); 1052 return(1); 1053 } 1054 1055 #define emulated_dma() ((machineid & ATARI_HADES) ? 1 : 0) 1056 1057 /* 1058 * Locking stuff. All turns into NOP's on the TT. 1059 */ 1060 #define fair_to_keep_dma() ((machineid & ATARI_FALCON) ? \ 1061 !st_dmawanted() : 1) 1062 #define claimed_dma() ((machineid & ATARI_FALCON) ? \ 1063 falcon_claimed_dma() : 1) 1064 #define reconsider_dma() { \ 1065 if(machineid & ATARI_FALCON) \ 1066 falcon_reconsider_dma();\ 1067 } 1068 #endif /* defined(TT_SCSI) && defined(FALCON_SCSI) */ 1069 1070 /********************************************** 1071 * Functions present for both TT and Falcon. * 1072 **********************************************/ 1073 /* 1074 * Our autoconfig matching function 1075 */ 1076 static int 1077 machine_match(struct device *pdp, void *match, void *auxp, 1078 struct cfdriver *cd) 1079 { 1080 struct cfdata *cdp = match; 1081 1082 if (strcmp(auxp, cd->cd_name)) 1083 return(0); 1084 if (cdp->cf_unit != 0) /* Only one unit */ 1085 return(0); 1086 return(1); 1087 } 1088 1089 /* 1090 * Bounce buffer (de)allocation. Those buffers are gotten from the ST-mem 1091 * pool. Allocation here is both contiguous and in the lower 16Mb of 1092 * the address space. Thus being DMA-able for all controllers. 1093 */ 1094 static u_char * 1095 alloc_bounceb(u_long len) 1096 { 1097 void *tmp; 1098 1099 return((u_char *)alloc_stmem(len, &tmp)); 1100 } 1101 1102 static void 1103 free_bounceb(u_char *bounceb) 1104 { 1105 free_stmem(bounceb); 1106 } 1107 1108 /* 1109 * 5380 interrupt. 1110 */ 1111 void 1112 scsi_ctrl(int sr) 1113 { 1114 if (GET_5380_REG(NCR5380_DMSTAT) & SC_IRQ_SET) { 1115 scsi_idisable(); 1116 if (!BASEPRI(sr)) 1117 add_sicallback((si_farg)ncr_ctrl_intr, 1118 (void *)cur_softc, 0); 1119 else { 1120 spl1(); 1121 ncr_ctrl_intr(cur_softc); 1122 spl0(); 1123 } 1124 } 1125 } 1126 1127 /* 1128 * DMA controller interrupt 1129 */ 1130 void 1131 scsi_dma(int sr) 1132 { 1133 SC_REQ *reqp; 1134 1135 if ((reqp = connected) && (reqp->dr_flag & DRIVER_IN_DMA)) { 1136 scsi_idisable(); 1137 if (!BASEPRI(sr)) 1138 add_sicallback((si_farg)ncr_dma_intr, 1139 (void *)cur_softc, 0); 1140 else { 1141 spl1(); 1142 ncr_dma_intr(cur_softc); 1143 spl0(); 1144 } 1145 } 1146 } 1147 1148 /* 1149 * Last but not least... Include the general driver code 1150 */ 1151 #include <atari/dev/ncr5380.c> 1152
Indexes created Mon Sep 29 21:09:56 GMT 2025