1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * pcic.c: MicroSPARC-IIep PCI controller support 4 * 5 * Copyright (C) 1998 V. Roganov and G. Raiko 6 * 7 * Code is derived from Ultra/PCI PSYCHO controller support, see that 8 * for author info. 9 * 10 * Support for diverse IIep based platforms by Pete Zaitcev. 11 * CP-1200 by Eric Brower. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/types.h> 16 #include <linux/init.h> 17 #include <linux/mm.h> 18 #include <linux/slab.h> 19 #include <linux/jiffies.h> 20 21 #include <asm/swift.h> /* for cache flushing. */ 22 #include <asm/io.h> 23 24 #include <linux/ctype.h> 25 #include <linux/pci.h> 26 #include <linux/time.h> 27 #include <linux/timex.h> 28 #include <linux/interrupt.h> 29 #include <linux/export.h> 30 31 #include <asm/irq.h> 32 #include <asm/oplib.h> 33 #include <asm/prom.h> 34 #include <asm/pcic.h> 35 #include <asm/timex.h> 36 #include <asm/timer.h> 37 #include <linux/uaccess.h> 38 #include <asm/irq_regs.h> 39 40 #include "kernel.h" 41 #include "irq.h" 42 43 /* 44 * I studied different documents and many live PROMs both from 2.30 45 * family and 3.xx versions. I came to the amazing conclusion: there is 46 * absolutely no way to route interrupts in IIep systems relying on 47 * information which PROM presents. We must hardcode interrupt routing 48 * schematics. And this actually sucks. -- zaitcev 1999/05/12 49 * 50 * To find irq for a device we determine which routing map 51 * is in effect or, in other words, on which machine we are running. 52 * We use PROM name for this although other techniques may be used 53 * in special cases (Gleb reports a PROMless IIep based system). 54 * Once we know the map we take device configuration address and 55 * find PCIC pin number where INT line goes. Then we may either program 56 * preferred irq into the PCIC or supply the preexisting irq to the device. 57 */ 58 struct pcic_ca2irq { 59 unsigned char busno; /* PCI bus number */ 60 unsigned char devfn; /* Configuration address */ 61 unsigned char pin; /* PCIC external interrupt pin */ 62 unsigned char irq; /* Preferred IRQ (mappable in PCIC) */ 63 unsigned int force; /* Enforce preferred IRQ */ 64 }; 65 66 struct pcic_sn2list { 67 char *sysname; 68 struct pcic_ca2irq *intmap; 69 int mapdim; 70 }; 71 72 /* 73 * JavaEngine-1 apparently has different versions. 74 * 75 * According to communications with Sun folks, for P2 build 501-4628-03: 76 * pin 0 - parallel, audio; 77 * pin 1 - Ethernet; 78 * pin 2 - su; 79 * pin 3 - PS/2 kbd and mouse. 80 * 81 * OEM manual (805-1486): 82 * pin 0: Ethernet 83 * pin 1: All EBus 84 * pin 2: IGA (unused) 85 * pin 3: Not connected 86 * OEM manual says that 501-4628 & 501-4811 are the same thing, 87 * only the latter has NAND flash in place. 88 * 89 * So far unofficial Sun wins over the OEM manual. Poor OEMs... 90 */ 91 static struct pcic_ca2irq pcic_i_je1a[] = { /* 501-4811-03 */ 92 { 0, 0x00, 2, 12, 0 }, /* EBus: hogs all */ 93 { 0, 0x01, 1, 6, 1 }, /* Happy Meal */ 94 { 0, 0x80, 0, 7, 0 }, /* IGA (unused) */ 95 }; 96 97 /* XXX JS-E entry is incomplete - PCI Slot 2 address (pin 7)? */ 98 static struct pcic_ca2irq pcic_i_jse[] = { 99 { 0, 0x00, 0, 13, 0 }, /* Ebus - serial and keyboard */ 100 { 0, 0x01, 1, 6, 0 }, /* hme */ 101 { 0, 0x08, 2, 9, 0 }, /* VGA - we hope not used :) */ 102 { 0, 0x10, 6, 8, 0 }, /* PCI INTA# in Slot 1 */ 103 { 0, 0x18, 7, 12, 0 }, /* PCI INTA# in Slot 2, shared w. RTC */ 104 { 0, 0x38, 4, 9, 0 }, /* All ISA devices. Read 8259. */ 105 { 0, 0x80, 5, 11, 0 }, /* EIDE */ 106 /* {0,0x88, 0,0,0} - unknown device... PMU? Probably no interrupt. */ 107 { 0, 0xA0, 4, 9, 0 }, /* USB */ 108 /* 109 * Some pins belong to non-PCI devices, we hardcode them in drivers. 110 * sun4m timers - irq 10, 14 111 * PC style RTC - pin 7, irq 4 ? 112 * Smart card, Parallel - pin 4 shared with USB, ISA 113 * audio - pin 3, irq 5 ? 114 */ 115 }; 116 117 /* SPARCengine-6 was the original release name of CP1200. 118 * The documentation differs between the two versions 119 */ 120 static struct pcic_ca2irq pcic_i_se6[] = { 121 { 0, 0x08, 0, 2, 0 }, /* SCSI */ 122 { 0, 0x01, 1, 6, 0 }, /* HME */ 123 { 0, 0x00, 3, 13, 0 }, /* EBus */ 124 }; 125 126 /* 127 * Krups (courtesy of Varol Kaptan) 128 * No documentation available, but it was easy to guess 129 * because it was very similar to Espresso. 130 * 131 * pin 0 - kbd, mouse, serial; 132 * pin 1 - Ethernet; 133 * pin 2 - igs (we do not use it); 134 * pin 3 - audio; 135 * pin 4,5,6 - unused; 136 * pin 7 - RTC (from P2 onwards as David B. says). 137 */ 138 static struct pcic_ca2irq pcic_i_jk[] = { 139 { 0, 0x00, 0, 13, 0 }, /* Ebus - serial and keyboard */ 140 { 0, 0x01, 1, 6, 0 }, /* hme */ 141 }; 142 143 /* 144 * Several entries in this list may point to the same routing map 145 * as several PROMs may be installed on the same physical board. 146 */ 147 #define SN2L_INIT(name, map) \ 148 { name, map, ARRAY_SIZE(map) } 149 150 static struct pcic_sn2list pcic_known_sysnames[] = { 151 SN2L_INIT("SUNW,JavaEngine1", pcic_i_je1a), /* JE1, PROM 2.32 */ 152 SN2L_INIT("SUNW,JS-E", pcic_i_jse), /* PROLL JavaStation-E */ 153 SN2L_INIT("SUNW,SPARCengine-6", pcic_i_se6), /* SPARCengine-6/CP-1200 */ 154 SN2L_INIT("SUNW,JS-NC", pcic_i_jk), /* PROLL JavaStation-NC */ 155 SN2L_INIT("SUNW,JSIIep", pcic_i_jk), /* OBP JavaStation-NC */ 156 { NULL, NULL, 0 } 157 }; 158 159 /* 160 * Only one PCIC per IIep, 161 * and since we have no SMP IIep, only one per system. 162 */ 163 static int pcic0_up; 164 static struct linux_pcic pcic0; 165 166 void __iomem *pcic_regs; 167 static volatile int pcic_speculative; 168 static volatile int pcic_trapped; 169 170 /* forward */ 171 unsigned int pcic_build_device_irq(struct platform_device *op, 172 unsigned int real_irq); 173 174 #define CONFIG_CMD(bus, device_fn, where) (0x80000000 | (((unsigned int)bus) << 16) | (((unsigned int)device_fn) << 8) | (where & ~3)) 175 176 static int pcic_read_config_dword(unsigned int busno, unsigned int devfn, 177 int where, u32 *value) 178 { 179 struct linux_pcic *pcic; 180 unsigned long flags; 181 182 pcic = &pcic0; 183 184 local_irq_save(flags); 185 #if 0 /* does not fail here */ 186 pcic_speculative = 1; 187 pcic_trapped = 0; 188 #endif 189 writel(CONFIG_CMD(busno, devfn, where), pcic->pcic_config_space_addr); 190 #if 0 /* does not fail here */ 191 nop(); 192 if (pcic_trapped) { 193 local_irq_restore(flags); 194 *value = ~0; 195 return 0; 196 } 197 #endif 198 pcic_speculative = 2; 199 pcic_trapped = 0; 200 *value = readl(pcic->pcic_config_space_data + (where&4)); 201 nop(); 202 if (pcic_trapped) { 203 pcic_speculative = 0; 204 local_irq_restore(flags); 205 *value = ~0; 206 return 0; 207 } 208 pcic_speculative = 0; 209 local_irq_restore(flags); 210 return 0; 211 } 212 213 static int pcic_read_config(struct pci_bus *bus, unsigned int devfn, 214 int where, int size, u32 *val) 215 { 216 unsigned int v; 217 218 if (bus->number != 0) return -EINVAL; 219 switch (size) { 220 case 1: 221 pcic_read_config_dword(bus->number, devfn, where&~3, &v); 222 *val = 0xff & (v >> (8*(where & 3))); 223 return 0; 224 case 2: 225 if (where&1) return -EINVAL; 226 pcic_read_config_dword(bus->number, devfn, where&~3, &v); 227 *val = 0xffff & (v >> (8*(where & 3))); 228 return 0; 229 case 4: 230 if (where&3) return -EINVAL; 231 pcic_read_config_dword(bus->number, devfn, where&~3, val); 232 return 0; 233 } 234 return -EINVAL; 235 } 236 237 static int pcic_write_config_dword(unsigned int busno, unsigned int devfn, 238 int where, u32 value) 239 { 240 struct linux_pcic *pcic; 241 unsigned long flags; 242 243 pcic = &pcic0; 244 245 local_irq_save(flags); 246 writel(CONFIG_CMD(busno, devfn, where), pcic->pcic_config_space_addr); 247 writel(value, pcic->pcic_config_space_data + (where&4)); 248 local_irq_restore(flags); 249 return 0; 250 } 251 252 static int pcic_write_config(struct pci_bus *bus, unsigned int devfn, 253 int where, int size, u32 val) 254 { 255 unsigned int v; 256 257 if (bus->number != 0) return -EINVAL; 258 switch (size) { 259 case 1: 260 pcic_read_config_dword(bus->number, devfn, where&~3, &v); 261 v = (v & ~(0xff << (8*(where&3)))) | 262 ((0xff&val) << (8*(where&3))); 263 return pcic_write_config_dword(bus->number, devfn, where&~3, v); 264 case 2: 265 if (where&1) return -EINVAL; 266 pcic_read_config_dword(bus->number, devfn, where&~3, &v); 267 v = (v & ~(0xffff << (8*(where&3)))) | 268 ((0xffff&val) << (8*(where&3))); 269 return pcic_write_config_dword(bus->number, devfn, where&~3, v); 270 case 4: 271 if (where&3) return -EINVAL; 272 return pcic_write_config_dword(bus->number, devfn, where, val); 273 } 274 return -EINVAL; 275 } 276 277 static struct pci_ops pcic_ops = { 278 .read = pcic_read_config, 279 .write = pcic_write_config, 280 }; 281 282 /* 283 * On sparc64 pcibios_init() calls pci_controller_probe(). 284 * We want PCIC probed little ahead so that interrupt controller 285 * would be operational. 286 */ 287 int __init pcic_probe(void) 288 { 289 struct linux_pcic *pcic; 290 struct linux_prom_registers regs[PROMREG_MAX]; 291 struct linux_pbm_info* pbm; 292 char namebuf[64]; 293 phandle node; 294 int err; 295 296 if (pcic0_up) { 297 prom_printf("PCIC: called twice!\n"); 298 prom_halt(); 299 } 300 pcic = &pcic0; 301 302 node = prom_getchild (prom_root_node); 303 node = prom_searchsiblings (node, "pci"); 304 if (node == 0) 305 return -ENODEV; 306 /* 307 * Map in PCIC register set, config space, and IO base 308 */ 309 err = prom_getproperty(node, "reg", (char*)regs, sizeof(regs)); 310 if (err == 0 || err == -1) { 311 prom_printf("PCIC: Error, cannot get PCIC registers " 312 "from PROM.\n"); 313 prom_halt(); 314 } 315 316 pcic0_up = 1; 317 318 pcic->pcic_res_regs.name = "pcic_registers"; 319 pcic->pcic_regs = ioremap(regs[0].phys_addr, regs[0].reg_size); 320 if (!pcic->pcic_regs) { 321 prom_printf("PCIC: Error, cannot map PCIC registers.\n"); 322 prom_halt(); 323 } 324 325 pcic->pcic_res_io.name = "pcic_io"; 326 if ((pcic->pcic_io = (unsigned long) 327 ioremap(regs[1].phys_addr, 0x10000)) == 0) { 328 prom_printf("PCIC: Error, cannot map PCIC IO Base.\n"); 329 prom_halt(); 330 } 331 332 pcic->pcic_res_cfg_addr.name = "pcic_cfg_addr"; 333 if ((pcic->pcic_config_space_addr = 334 ioremap(regs[2].phys_addr, regs[2].reg_size * 2)) == NULL) { 335 prom_printf("PCIC: Error, cannot map " 336 "PCI Configuration Space Address.\n"); 337 prom_halt(); 338 } 339 340 /* 341 * Docs say three least significant bits in address and data 342 * must be the same. Thus, we need adjust size of data. 343 */ 344 pcic->pcic_res_cfg_data.name = "pcic_cfg_data"; 345 if ((pcic->pcic_config_space_data = 346 ioremap(regs[3].phys_addr, regs[3].reg_size * 2)) == NULL) { 347 prom_printf("PCIC: Error, cannot map " 348 "PCI Configuration Space Data.\n"); 349 prom_halt(); 350 } 351 352 pbm = &pcic->pbm; 353 pbm->prom_node = node; 354 prom_getstring(node, "name", namebuf, 63); namebuf[63] = 0; 355 strcpy(pbm->prom_name, namebuf); 356 357 { 358 extern int pcic_nmi_trap_patch[4]; 359 360 t_nmi[0] = pcic_nmi_trap_patch[0]; 361 t_nmi[1] = pcic_nmi_trap_patch[1]; 362 t_nmi[2] = pcic_nmi_trap_patch[2]; 363 t_nmi[3] = pcic_nmi_trap_patch[3]; 364 swift_flush_dcache(); 365 pcic_regs = pcic->pcic_regs; 366 } 367 368 prom_getstring(prom_root_node, "name", namebuf, 63); namebuf[63] = 0; 369 { 370 struct pcic_sn2list *p; 371 372 for (p = pcic_known_sysnames; p->sysname != NULL; p++) { 373 if (strcmp(namebuf, p->sysname) == 0) 374 break; 375 } 376 pcic->pcic_imap = p->intmap; 377 pcic->pcic_imdim = p->mapdim; 378 } 379 if (pcic->pcic_imap == NULL) { 380 /* 381 * We do not panic here for the sake of embedded systems. 382 */ 383 printk("PCIC: System %s is unknown, cannot route interrupts\n", 384 namebuf); 385 } 386 387 return 0; 388 } 389 390 static void __init pcic_pbm_scan_bus(struct linux_pcic *pcic) 391 { 392 struct linux_pbm_info *pbm = &pcic->pbm; 393 394 pbm->pci_bus = pci_scan_bus(pbm->pci_first_busno, &pcic_ops, pbm); 395 if (!pbm->pci_bus) 396 return; 397 398 #if 0 /* deadwood transplanted from sparc64 */ 399 pci_fill_in_pbm_cookies(pbm->pci_bus, pbm, pbm->prom_node); 400 pci_record_assignments(pbm, pbm->pci_bus); 401 pci_assign_unassigned(pbm, pbm->pci_bus); 402 pci_fixup_irq(pbm, pbm->pci_bus); 403 #endif 404 pci_bus_add_devices(pbm->pci_bus); 405 } 406 407 /* 408 * Main entry point from the PCI subsystem. 409 */ 410 static int __init pcic_init(void) 411 { 412 struct linux_pcic *pcic; 413 414 /* 415 * PCIC should be initialized at start of the timer. 416 * So, here we report the presence of PCIC and do some magic passes. 417 */ 418 if(!pcic0_up) 419 return 0; 420 pcic = &pcic0; 421 422 /* 423 * Switch off IOTLB translation. 424 */ 425 writeb(PCI_DVMA_CONTROL_IOTLB_DISABLE, 426 pcic->pcic_regs+PCI_DVMA_CONTROL); 427 428 /* 429 * Increase mapped size for PCI memory space (DMA access). 430 * Should be done in that order (size first, address second). 431 * Why we couldn't set up 4GB and forget about it? XXX 432 */ 433 writel(0xF0000000UL, pcic->pcic_regs+PCI_SIZE_0); 434 writel(0+PCI_BASE_ADDRESS_SPACE_MEMORY, 435 pcic->pcic_regs+PCI_BASE_ADDRESS_0); 436 437 pcic_pbm_scan_bus(pcic); 438 439 return 0; 440 } 441 442 int pcic_present(void) 443 { 444 return pcic0_up; 445 } 446 447 static int pdev_to_pnode(struct linux_pbm_info *pbm, struct pci_dev *pdev) 448 { 449 struct linux_prom_pci_registers regs[PROMREG_MAX]; 450 int err; 451 phandle node = prom_getchild(pbm->prom_node); 452 453 while(node) { 454 err = prom_getproperty(node, "reg", 455 (char *)®s[0], sizeof(regs)); 456 if(err != 0 && err != -1) { 457 unsigned long devfn = (regs[0].which_io >> 8) & 0xff; 458 if(devfn == pdev->devfn) 459 return node; 460 } 461 node = prom_getsibling(node); 462 } 463 return 0; 464 } 465 466 static inline struct pcidev_cookie *pci_devcookie_alloc(void) 467 { 468 return kmalloc(sizeof(struct pcidev_cookie), GFP_ATOMIC); 469 } 470 471 static void pcic_map_pci_device(struct linux_pcic *pcic, 472 struct pci_dev *dev, int node) 473 { 474 char namebuf[64]; 475 unsigned long address; 476 unsigned long flags; 477 int j; 478 479 if (node == 0 || node == -1) { 480 strcpy(namebuf, "???"); 481 } else { 482 prom_getstring(node, "name", namebuf, 63); namebuf[63] = 0; 483 } 484 485 for (j = 0; j < 6; j++) { 486 address = dev->resource[j].start; 487 if (address == 0) break; /* are sequential */ 488 flags = dev->resource[j].flags; 489 if ((flags & IORESOURCE_IO) != 0) { 490 if (address < 0x10000) { 491 /* 492 * A device responds to I/O cycles on PCI. 493 * We generate these cycles with memory 494 * access into the fixed map (phys 0x30000000). 495 * 496 * Since a device driver does not want to 497 * do ioremap() before accessing PC-style I/O, 498 * we supply virtual, ready to access address. 499 * 500 * Note that request_region() 501 * works for these devices. 502 * 503 * XXX Neat trick, but it's a *bad* idea 504 * to shit into regions like that. 505 * What if we want to allocate one more 506 * PCI base address... 507 */ 508 dev->resource[j].start = 509 pcic->pcic_io + address; 510 dev->resource[j].end = 1; /* XXX */ 511 dev->resource[j].flags = 512 (flags & ~IORESOURCE_IO) | IORESOURCE_MEM; 513 } else { 514 /* 515 * OOPS... PCI Spec allows this. Sun does 516 * not have any devices getting above 64K 517 * so it must be user with a weird I/O 518 * board in a PCI slot. We must remap it 519 * under 64K but it is not done yet. XXX 520 */ 521 pci_info(dev, "PCIC: Skipping I/O space at " 522 "0x%lx, this will Oops if a driver " 523 "attaches device '%s'\n", address, 524 namebuf); 525 } 526 } 527 } 528 } 529 530 static void 531 pcic_fill_irq(struct linux_pcic *pcic, struct pci_dev *dev, int node) 532 { 533 struct pcic_ca2irq *p; 534 unsigned int real_irq; 535 int i, ivec; 536 char namebuf[64]; 537 538 if (node == 0 || node == -1) { 539 strcpy(namebuf, "???"); 540 } else { 541 prom_getstring(node, "name", namebuf, sizeof(namebuf)); 542 } 543 544 if ((p = pcic->pcic_imap) == NULL) { 545 dev->irq = 0; 546 return; 547 } 548 for (i = 0; i < pcic->pcic_imdim; i++) { 549 if (p->busno == dev->bus->number && p->devfn == dev->devfn) 550 break; 551 p++; 552 } 553 if (i >= pcic->pcic_imdim) { 554 pci_info(dev, "PCIC: device %s not found in %d\n", namebuf, 555 pcic->pcic_imdim); 556 dev->irq = 0; 557 return; 558 } 559 560 i = p->pin; 561 if (i >= 0 && i < 4) { 562 ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_LO); 563 real_irq = ivec >> (i << 2) & 0xF; 564 } else if (i >= 4 && i < 8) { 565 ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_HI); 566 real_irq = ivec >> ((i-4) << 2) & 0xF; 567 } else { /* Corrupted map */ 568 pci_info(dev, "PCIC: BAD PIN %d\n", i); for (;;) {} 569 } 570 /* P3 */ /* printk("PCIC: device %s pin %d ivec 0x%x irq %x\n", namebuf, i, ivec, dev->irq); */ 571 572 /* real_irq means PROM did not bother to program the upper 573 * half of PCIC. This happens on JS-E with PROM 3.11, for instance. 574 */ 575 if (real_irq == 0 || p->force) { 576 if (p->irq == 0 || p->irq >= 15) { /* Corrupted map */ 577 pci_info(dev, "PCIC: BAD IRQ %d\n", p->irq); for (;;) {} 578 } 579 pci_info(dev, "PCIC: setting irq %d at pin %d\n", p->irq, 580 p->pin); 581 real_irq = p->irq; 582 583 i = p->pin; 584 if (i >= 4) { 585 ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_HI); 586 ivec &= ~(0xF << ((i - 4) << 2)); 587 ivec |= p->irq << ((i - 4) << 2); 588 writew(ivec, pcic->pcic_regs+PCI_INT_SELECT_HI); 589 } else { 590 ivec = readw(pcic->pcic_regs+PCI_INT_SELECT_LO); 591 ivec &= ~(0xF << (i << 2)); 592 ivec |= p->irq << (i << 2); 593 writew(ivec, pcic->pcic_regs+PCI_INT_SELECT_LO); 594 } 595 } 596 dev->irq = pcic_build_device_irq(NULL, real_irq); 597 } 598 599 /* 600 * Normally called from {do_}pci_scan_bus... 601 */ 602 void pcibios_fixup_bus(struct pci_bus *bus) 603 { 604 struct pci_dev *dev; 605 struct linux_pcic *pcic; 606 /* struct linux_pbm_info* pbm = &pcic->pbm; */ 607 int node; 608 struct pcidev_cookie *pcp; 609 610 if (!pcic0_up) { 611 pci_info(bus, "pcibios_fixup_bus: no PCIC\n"); 612 return; 613 } 614 pcic = &pcic0; 615 616 /* 617 * Next crud is an equivalent of pbm = pcic_bus_to_pbm(bus); 618 */ 619 if (bus->number != 0) { 620 pci_info(bus, "pcibios_fixup_bus: nonzero bus 0x%x\n", 621 bus->number); 622 return; 623 } 624 625 list_for_each_entry(dev, &bus->devices, bus_list) { 626 node = pdev_to_pnode(&pcic->pbm, dev); 627 if(node == 0) 628 node = -1; 629 630 /* cookies */ 631 pcp = pci_devcookie_alloc(); 632 pcp->pbm = &pcic->pbm; 633 pcp->prom_node = of_find_node_by_phandle(node); 634 dev->sysdata = pcp; 635 636 /* fixing I/O to look like memory */ 637 if ((dev->class>>16) != PCI_BASE_CLASS_BRIDGE) 638 pcic_map_pci_device(pcic, dev, node); 639 640 pcic_fill_irq(pcic, dev, node); 641 } 642 } 643 644 int pcibios_enable_device(struct pci_dev *dev, int mask) 645 { 646 u16 cmd, oldcmd; 647 int i; 648 649 pci_read_config_word(dev, PCI_COMMAND, &cmd); 650 oldcmd = cmd; 651 652 for (i = 0; i < PCI_NUM_RESOURCES; i++) { 653 struct resource *res = &dev->resource[i]; 654 655 /* Only set up the requested stuff */ 656 if (!(mask & (1<<i))) 657 continue; 658 659 if (res->flags & IORESOURCE_IO) 660 cmd |= PCI_COMMAND_IO; 661 if (res->flags & IORESOURCE_MEM) 662 cmd |= PCI_COMMAND_MEMORY; 663 } 664 665 if (cmd != oldcmd) { 666 pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd); 667 pci_write_config_word(dev, PCI_COMMAND, cmd); 668 } 669 return 0; 670 } 671 672 /* Makes compiler happy */ 673 static volatile int pcic_timer_dummy; 674 675 static void pcic_clear_clock_irq(void) 676 { 677 pcic_timer_dummy = readl(pcic0.pcic_regs+PCI_SYS_LIMIT); 678 } 679 680 /* CPU frequency is 100 MHz, timer increments every 4 CPU clocks */ 681 #define USECS_PER_JIFFY (1000000 / HZ) 682 #define TICK_TIMER_LIMIT ((100 * 1000000 / 4) / HZ) 683 684 static unsigned int pcic_cycles_offset(void) 685 { 686 u32 value, count; 687 688 value = readl(pcic0.pcic_regs + PCI_SYS_COUNTER); 689 count = value & ~PCI_SYS_COUNTER_OVERFLOW; 690 691 if (value & PCI_SYS_COUNTER_OVERFLOW) 692 count += TICK_TIMER_LIMIT; 693 /* 694 * We divide all by HZ 695 * to have microsecond resolution and to avoid overflow 696 */ 697 count = ((count / HZ) * USECS_PER_JIFFY) / (TICK_TIMER_LIMIT / HZ); 698 699 /* Coordinate with the sparc_config.clock_rate setting */ 700 return count * 2; 701 } 702 703 void __init pci_time_init(void) 704 { 705 struct linux_pcic *pcic = &pcic0; 706 unsigned long v; 707 int timer_irq, irq; 708 int err; 709 710 #ifndef CONFIG_SMP 711 /* 712 * The clock_rate is in SBUS dimension. 713 * We take into account this in pcic_cycles_offset() 714 */ 715 sparc_config.clock_rate = SBUS_CLOCK_RATE / HZ; 716 sparc_config.features |= FEAT_L10_CLOCKEVENT; 717 #endif 718 sparc_config.features |= FEAT_L10_CLOCKSOURCE; 719 sparc_config.get_cycles_offset = pcic_cycles_offset; 720 721 writel (TICK_TIMER_LIMIT, pcic->pcic_regs+PCI_SYS_LIMIT); 722 /* PROM should set appropriate irq */ 723 v = readb(pcic->pcic_regs+PCI_COUNTER_IRQ); 724 timer_irq = PCI_COUNTER_IRQ_SYS(v); 725 writel (PCI_COUNTER_IRQ_SET(timer_irq, 0), 726 pcic->pcic_regs+PCI_COUNTER_IRQ); 727 irq = pcic_build_device_irq(NULL, timer_irq); 728 err = request_irq(irq, timer_interrupt, 729 IRQF_TIMER, "timer", NULL); 730 if (err) { 731 prom_printf("time_init: unable to attach IRQ%d\n", timer_irq); 732 prom_halt(); 733 } 734 local_irq_enable(); 735 } 736 737 738 #if 0 739 static void watchdog_reset() { 740 writeb(0, pcic->pcic_regs+PCI_SYS_STATUS); 741 } 742 #endif 743 744 /* 745 * NMI 746 */ 747 void pcic_nmi(unsigned int pend, struct pt_regs *regs) 748 { 749 pend = swab32(pend); 750 751 if (!pcic_speculative || (pend & PCI_SYS_INT_PENDING_PIO) == 0) { 752 /* 753 * XXX On CP-1200 PCI #SERR may happen, we do not know 754 * what to do about it yet. 755 */ 756 printk("Aiee, NMI pend 0x%x pc 0x%x spec %d, hanging\n", 757 pend, (int)regs->pc, pcic_speculative); 758 for (;;) { } 759 } 760 pcic_speculative = 0; 761 pcic_trapped = 1; 762 regs->pc = regs->npc; 763 regs->npc += 4; 764 } 765 766 static inline unsigned long get_irqmask(int irq_nr) 767 { 768 return 1 << irq_nr; 769 } 770 771 static void pcic_mask_irq(struct irq_data *data) 772 { 773 unsigned long mask, flags; 774 775 mask = (unsigned long)data->chip_data; 776 local_irq_save(flags); 777 writel(mask, pcic0.pcic_regs+PCI_SYS_INT_TARGET_MASK_SET); 778 local_irq_restore(flags); 779 } 780 781 static void pcic_unmask_irq(struct irq_data *data) 782 { 783 unsigned long mask, flags; 784 785 mask = (unsigned long)data->chip_data; 786 local_irq_save(flags); 787 writel(mask, pcic0.pcic_regs+PCI_SYS_INT_TARGET_MASK_CLEAR); 788 local_irq_restore(flags); 789 } 790 791 static unsigned int pcic_startup_irq(struct irq_data *data) 792 { 793 irq_link(data->irq); 794 pcic_unmask_irq(data); 795 return 0; 796 } 797 798 static struct irq_chip pcic_irq = { 799 .name = "pcic", 800 .irq_startup = pcic_startup_irq, 801 .irq_mask = pcic_mask_irq, 802 .irq_unmask = pcic_unmask_irq, 803 }; 804 805 unsigned int pcic_build_device_irq(struct platform_device *op, 806 unsigned int real_irq) 807 { 808 unsigned int irq; 809 unsigned long mask; 810 811 irq = 0; 812 mask = get_irqmask(real_irq); 813 if (mask == 0) 814 goto out; 815 816 irq = irq_alloc(real_irq, real_irq); 817 if (irq == 0) 818 goto out; 819 820 irq_set_chip_and_handler_name(irq, &pcic_irq, 821 handle_level_irq, "PCIC"); 822 irq_set_chip_data(irq, (void *)mask); 823 824 out: 825 return irq; 826 } 827 828 829 static void pcic_load_profile_irq(int cpu, unsigned int limit) 830 { 831 printk("PCIC: unimplemented code: FILE=%s LINE=%d", __FILE__, __LINE__); 832 } 833 834 void __init sun4m_pci_init_IRQ(void) 835 { 836 sparc_config.build_device_irq = pcic_build_device_irq; 837 sparc_config.clear_clock_irq = pcic_clear_clock_irq; 838 sparc_config.load_profile_irq = pcic_load_profile_irq; 839 } 840 841 subsys_initcall(pcic_init); 842