1/* 2 * Define the pci_ops for the PCIC on Toshiba TX4927, TX4938, etc. 3 * 4 * Based on linux/arch/mips/pci/ops-tx4938.c, 5 * linux/arch/mips/pci/fixup-rbtx4938.c, 6 * linux/arch/mips/txx9/rbtx4938/setup.c, 7 * and RBTX49xx patch from CELF patch archive. 8 * 9 * 2003-2005 (c) MontaVista Software, Inc. 10 * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org) 11 * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007 12 * 13 * This program is free software; you can redistribute it and/or modify it 14 * under the terms of the GNU General Public License as published by the 15 * Free Software Foundation; either version 2 of the License, or (at your 16 * option) any later version. 17 */ 18#include <linux/kernel.h> 19#include <linux/interrupt.h> 20#include <linux/irq.h> 21#include <asm/txx9/pci.h> 22#include <asm/txx9/tx4927pcic.h> 23 24static struct { 25 struct pci_controller *channel; 26 struct tx4927_pcic_reg __iomem *pcicptr; 27} pcicptrs[2]; /* TX4938 has 2 pcic */ 28 29static void __init set_tx4927_pcicptr(struct pci_controller *channel, 30 struct tx4927_pcic_reg __iomem *pcicptr) 31{ 32 int i; 33 34 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) { 35 if (pcicptrs[i].channel == channel) { 36 pcicptrs[i].pcicptr = pcicptr; 37 return; 38 } 39 } 40 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) { 41 if (!pcicptrs[i].channel) { 42 pcicptrs[i].channel = channel; 43 pcicptrs[i].pcicptr = pcicptr; 44 return; 45 } 46 } 47 BUG(); 48} 49 50struct tx4927_pcic_reg __iomem *get_tx4927_pcicptr( 51 struct pci_controller *channel) 52{ 53 int i; 54 55 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) { 56 if (pcicptrs[i].channel == channel) 57 return pcicptrs[i].pcicptr; 58 } 59 return NULL; 60} 61 62static int mkaddr(struct pci_bus *bus, unsigned int devfn, int where, 63 struct tx4927_pcic_reg __iomem *pcicptr) 64{ 65 if (bus->parent == NULL && 66 devfn >= PCI_DEVFN(TX4927_PCIC_MAX_DEVNU, 0)) 67 return -1; 68 __raw_writel(((bus->number & 0xff) << 0x10) 69 | ((devfn & 0xff) << 0x08) | (where & 0xfc) 70 | (bus->parent ? 1 : 0), 71 &pcicptr->g2pcfgadrs); 72 /* clear M_ABORT and Disable M_ABORT Int. */ 73 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff) 74 | (PCI_STATUS_REC_MASTER_ABORT << 16), 75 &pcicptr->pcistatus); 76 return 0; 77} 78 79static int check_abort(struct tx4927_pcic_reg __iomem *pcicptr) 80{ 81 int code = PCIBIOS_SUCCESSFUL; 82 83 /* wait write cycle completion before checking error status */ 84 while (__raw_readl(&pcicptr->pcicstatus) & TX4927_PCIC_PCICSTATUS_IWB) 85 ; 86 if (__raw_readl(&pcicptr->pcistatus) 87 & (PCI_STATUS_REC_MASTER_ABORT << 16)) { 88 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff) 89 | (PCI_STATUS_REC_MASTER_ABORT << 16), 90 &pcicptr->pcistatus); 91 /* flush write buffer */ 92 iob(); 93 code = PCIBIOS_DEVICE_NOT_FOUND; 94 } 95 return code; 96} 97 98static u8 icd_readb(int offset, struct tx4927_pcic_reg __iomem *pcicptr) 99{ 100#ifdef __BIG_ENDIAN 101 offset ^= 3; 102#endif 103 return __raw_readb((void __iomem *)&pcicptr->g2pcfgdata + offset); 104} 105static u16 icd_readw(int offset, struct tx4927_pcic_reg __iomem *pcicptr) 106{ 107#ifdef __BIG_ENDIAN 108 offset ^= 2; 109#endif 110 return __raw_readw((void __iomem *)&pcicptr->g2pcfgdata + offset); 111} 112static u32 icd_readl(struct tx4927_pcic_reg __iomem *pcicptr) 113{ 114 return __raw_readl(&pcicptr->g2pcfgdata); 115} 116static void icd_writeb(u8 val, int offset, 117 struct tx4927_pcic_reg __iomem *pcicptr) 118{ 119#ifdef __BIG_ENDIAN 120 offset ^= 3; 121#endif 122 __raw_writeb(val, (void __iomem *)&pcicptr->g2pcfgdata + offset); 123} 124static void icd_writew(u16 val, int offset, 125 struct tx4927_pcic_reg __iomem *pcicptr) 126{ 127#ifdef __BIG_ENDIAN 128 offset ^= 2; 129#endif 130 __raw_writew(val, (void __iomem *)&pcicptr->g2pcfgdata + offset); 131} 132static void icd_writel(u32 val, struct tx4927_pcic_reg __iomem *pcicptr) 133{ 134 __raw_writel(val, &pcicptr->g2pcfgdata); 135} 136 137static struct tx4927_pcic_reg __iomem *pci_bus_to_pcicptr(struct pci_bus *bus) 138{ 139 struct pci_controller *channel = bus->sysdata; 140 return get_tx4927_pcicptr(channel); 141} 142 143static int tx4927_pci_config_read(struct pci_bus *bus, unsigned int devfn, 144 int where, int size, u32 *val) 145{ 146 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus); 147 148 if (mkaddr(bus, devfn, where, pcicptr)) { 149 *val = 0xffffffff; 150 return -1; 151 } 152 switch (size) { 153 case 1: 154 *val = icd_readb(where & 3, pcicptr); 155 break; 156 case 2: 157 *val = icd_readw(where & 3, pcicptr); 158 break; 159 default: 160 *val = icd_readl(pcicptr); 161 } 162 return check_abort(pcicptr); 163} 164 165static int tx4927_pci_config_write(struct pci_bus *bus, unsigned int devfn, 166 int where, int size, u32 val) 167{ 168 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(bus); 169 170 if (mkaddr(bus, devfn, where, pcicptr)) 171 return -1; 172 switch (size) { 173 case 1: 174 icd_writeb(val, where & 3, pcicptr); 175 break; 176 case 2: 177 icd_writew(val, where & 3, pcicptr); 178 break; 179 default: 180 icd_writel(val, pcicptr); 181 } 182 return check_abort(pcicptr); 183} 184 185static struct pci_ops tx4927_pci_ops = { 186 .read = tx4927_pci_config_read, 187 .write = tx4927_pci_config_write, 188}; 189 190static struct { 191 u8 trdyto; 192 u8 retryto; 193 u16 gbwc; 194} tx4927_pci_opts = { 195 .trdyto = 0, 196 .retryto = 0, 197 .gbwc = 0xfe0, /* 4064 GBUSCLK for CCFG.GTOT=0b11 */ 198}; 199 200char *tx4927_pcibios_setup(char *str) 201{ 202 if (!strncmp(str, "trdyto=", 7)) { 203 u8 val = 0; 204 if (kstrtou8(str + 7, 0, &val) == 0) 205 tx4927_pci_opts.trdyto = val; 206 return NULL; 207 } 208 if (!strncmp(str, "retryto=", 8)) { 209 u8 val = 0; 210 if (kstrtou8(str + 8, 0, &val) == 0) 211 tx4927_pci_opts.retryto = val; 212 return NULL; 213 } 214 if (!strncmp(str, "gbwc=", 5)) { 215 u16 val; 216 if (kstrtou16(str + 5, 0, &val) == 0) 217 tx4927_pci_opts.gbwc = val; 218 return NULL; 219 } 220 return str; 221} 222 223void __init tx4927_pcic_setup(struct tx4927_pcic_reg __iomem *pcicptr, 224 struct pci_controller *channel, int extarb) 225{ 226 int i; 227 unsigned long flags; 228 229 set_tx4927_pcicptr(channel, pcicptr); 230 231 if (!channel->pci_ops) 232 printk(KERN_INFO 233 "PCIC -- DID:%04x VID:%04x RID:%02x Arbiter:%s\n", 234 __raw_readl(&pcicptr->pciid) >> 16, 235 __raw_readl(&pcicptr->pciid) & 0xffff, 236 __raw_readl(&pcicptr->pciccrev) & 0xff, 237 extarb ? "External" : "Internal"); 238 channel->pci_ops = &tx4927_pci_ops; 239 240 local_irq_save(flags); 241 242 /* Disable All Initiator Space */ 243 __raw_writel(__raw_readl(&pcicptr->pciccfg) 244 & ~(TX4927_PCIC_PCICCFG_G2PMEN(0) 245 | TX4927_PCIC_PCICCFG_G2PMEN(1) 246 | TX4927_PCIC_PCICCFG_G2PMEN(2) 247 | TX4927_PCIC_PCICCFG_G2PIOEN), 248 &pcicptr->pciccfg); 249 250 /* GB->PCI mappings */ 251 __raw_writel((channel->io_resource->end - channel->io_resource->start) 252 >> 4, 253 &pcicptr->g2piomask); 254 ____raw_writeq((channel->io_resource->start + 255 channel->io_map_base - IO_BASE) | 256#ifdef __BIG_ENDIAN 257 TX4927_PCIC_G2PIOGBASE_ECHG 258#else 259 TX4927_PCIC_G2PIOGBASE_BSDIS 260#endif 261 , &pcicptr->g2piogbase); 262 ____raw_writeq(channel->io_resource->start - channel->io_offset, 263 &pcicptr->g2piopbase); 264 for (i = 0; i < 3; i++) { 265 __raw_writel(0, &pcicptr->g2pmmask[i]); 266 ____raw_writeq(0, &pcicptr->g2pmgbase[i]); 267 ____raw_writeq(0, &pcicptr->g2pmpbase[i]); 268 } 269 if (channel->mem_resource->end) { 270 __raw_writel((channel->mem_resource->end 271 - channel->mem_resource->start) >> 4, 272 &pcicptr->g2pmmask[0]); 273 ____raw_writeq(channel->mem_resource->start | 274#ifdef __BIG_ENDIAN 275 TX4927_PCIC_G2PMnGBASE_ECHG 276#else 277 TX4927_PCIC_G2PMnGBASE_BSDIS 278#endif 279 , &pcicptr->g2pmgbase[0]); 280 ____raw_writeq(channel->mem_resource->start - 281 channel->mem_offset, 282 &pcicptr->g2pmpbase[0]); 283 } 284 /* PCI->GB mappings (I/O 256B) */ 285 __raw_writel(0, &pcicptr->p2giopbase); /* 256B */ 286 ____raw_writeq(0, &pcicptr->p2giogbase); 287 /* PCI->GB mappings (MEM 512MB (64MB on R1.x)) */ 288 __raw_writel(0, &pcicptr->p2gm0plbase); 289 __raw_writel(0, &pcicptr->p2gm0pubase); 290 ____raw_writeq(TX4927_PCIC_P2GMnGBASE_TMEMEN | 291#ifdef __BIG_ENDIAN 292 TX4927_PCIC_P2GMnGBASE_TECHG 293#else 294 TX4927_PCIC_P2GMnGBASE_TBSDIS 295#endif 296 , &pcicptr->p2gmgbase[0]); 297 /* PCI->GB mappings (MEM 16MB) */ 298 __raw_writel(0xffffffff, &pcicptr->p2gm1plbase); 299 __raw_writel(0xffffffff, &pcicptr->p2gm1pubase); 300 ____raw_writeq(0, &pcicptr->p2gmgbase[1]); 301 /* PCI->GB mappings (MEM 1MB) */ 302 __raw_writel(0xffffffff, &pcicptr->p2gm2pbase); /* 1MB */ 303 ____raw_writeq(0, &pcicptr->p2gmgbase[2]); 304 305 /* Clear all (including IRBER) except for GBWC */ 306 __raw_writel((tx4927_pci_opts.gbwc << 16) 307 & TX4927_PCIC_PCICCFG_GBWC_MASK, 308 &pcicptr->pciccfg); 309 /* Enable Initiator Memory Space */ 310 if (channel->mem_resource->end) 311 __raw_writel(__raw_readl(&pcicptr->pciccfg) 312 | TX4927_PCIC_PCICCFG_G2PMEN(0), 313 &pcicptr->pciccfg); 314 /* Enable Initiator I/O Space */ 315 if (channel->io_resource->end) 316 __raw_writel(__raw_readl(&pcicptr->pciccfg) 317 | TX4927_PCIC_PCICCFG_G2PIOEN, 318 &pcicptr->pciccfg); 319 /* Enable Initiator Config */ 320 __raw_writel(__raw_readl(&pcicptr->pciccfg) 321 | TX4927_PCIC_PCICCFG_ICAEN | TX4927_PCIC_PCICCFG_TCAR, 322 &pcicptr->pciccfg); 323 324 /* Do not use MEMMUL, MEMINF: YMFPCI card causes M_ABORT. */ 325 __raw_writel(0, &pcicptr->pcicfg1); 326 327 __raw_writel((__raw_readl(&pcicptr->g2ptocnt) & ~0xffff) 328 | (tx4927_pci_opts.trdyto & 0xff) 329 | ((tx4927_pci_opts.retryto & 0xff) << 8), 330 &pcicptr->g2ptocnt); 331 332 /* Clear All Local Bus Status */ 333 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus); 334 /* Enable All Local Bus Interrupts */ 335 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicmask); 336 /* Clear All Initiator Status */ 337 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus); 338 /* Enable All Initiator Interrupts */ 339 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pmask); 340 /* Clear All PCI Status Error */ 341 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff) 342 | (TX4927_PCIC_PCISTATUS_ALL << 16), 343 &pcicptr->pcistatus); 344 /* Enable All PCI Status Error Interrupts */ 345 __raw_writel(TX4927_PCIC_PCISTATUS_ALL, &pcicptr->pcimask); 346 347 if (!extarb) { 348 /* Reset Bus Arbiter */ 349 __raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg); 350 __raw_writel(0, &pcicptr->pbabm); 351 /* Enable Bus Arbiter */ 352 __raw_writel(TX4927_PCIC_PBACFG_PBAEN, &pcicptr->pbacfg); 353 } 354 355 __raw_writel(PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY 356 | PCI_COMMAND_PARITY | PCI_COMMAND_SERR, 357 &pcicptr->pcistatus); 358 local_irq_restore(flags); 359 360 printk(KERN_DEBUG 361 "PCI: COMMAND=%04x,PCIMASK=%04x," 362 "TRDYTO=%02x,RETRYTO=%02x,GBWC=%03x\n", 363 __raw_readl(&pcicptr->pcistatus) & 0xffff, 364 __raw_readl(&pcicptr->pcimask) & 0xffff, 365 __raw_readl(&pcicptr->g2ptocnt) & 0xff, 366 (__raw_readl(&pcicptr->g2ptocnt) & 0xff00) >> 8, 367 (__raw_readl(&pcicptr->pciccfg) >> 16) & 0xfff); 368} 369 370static void tx4927_report_pcic_status1(struct tx4927_pcic_reg __iomem *pcicptr) 371{ 372 __u16 pcistatus = (__u16)(__raw_readl(&pcicptr->pcistatus) >> 16); 373 __u32 g2pstatus = __raw_readl(&pcicptr->g2pstatus); 374 __u32 pcicstatus = __raw_readl(&pcicptr->pcicstatus); 375 static struct { 376 __u32 flag; 377 const char *str; 378 } pcistat_tbl[] = { 379 { PCI_STATUS_DETECTED_PARITY, "DetectedParityError" }, 380 { PCI_STATUS_SIG_SYSTEM_ERROR, "SignaledSystemError" }, 381 { PCI_STATUS_REC_MASTER_ABORT, "ReceivedMasterAbort" }, 382 { PCI_STATUS_REC_TARGET_ABORT, "ReceivedTargetAbort" }, 383 { PCI_STATUS_SIG_TARGET_ABORT, "SignaledTargetAbort" }, 384 { PCI_STATUS_PARITY, "MasterParityError" }, 385 }, g2pstat_tbl[] = { 386 { TX4927_PCIC_G2PSTATUS_TTOE, "TIOE" }, 387 { TX4927_PCIC_G2PSTATUS_RTOE, "RTOE" }, 388 }, pcicstat_tbl[] = { 389 { TX4927_PCIC_PCICSTATUS_PME, "PME" }, 390 { TX4927_PCIC_PCICSTATUS_TLB, "TLB" }, 391 { TX4927_PCIC_PCICSTATUS_NIB, "NIB" }, 392 { TX4927_PCIC_PCICSTATUS_ZIB, "ZIB" }, 393 { TX4927_PCIC_PCICSTATUS_PERR, "PERR" }, 394 { TX4927_PCIC_PCICSTATUS_SERR, "SERR" }, 395 { TX4927_PCIC_PCICSTATUS_GBE, "GBE" }, 396 { TX4927_PCIC_PCICSTATUS_IWB, "IWB" }, 397 }; 398 int i, cont; 399 400 printk(KERN_ERR ""); 401 if (pcistatus & TX4927_PCIC_PCISTATUS_ALL) { 402 printk(KERN_CONT "pcistat:%04x(", pcistatus); 403 for (i = 0, cont = 0; i < ARRAY_SIZE(pcistat_tbl); i++) 404 if (pcistatus & pcistat_tbl[i].flag) 405 printk(KERN_CONT "%s%s", 406 cont++ ? " " : "", pcistat_tbl[i].str); 407 printk(KERN_CONT ") "); 408 } 409 if (g2pstatus & TX4927_PCIC_G2PSTATUS_ALL) { 410 printk(KERN_CONT "g2pstatus:%08x(", g2pstatus); 411 for (i = 0, cont = 0; i < ARRAY_SIZE(g2pstat_tbl); i++) 412 if (g2pstatus & g2pstat_tbl[i].flag) 413 printk(KERN_CONT "%s%s", 414 cont++ ? " " : "", g2pstat_tbl[i].str); 415 printk(KERN_CONT ") "); 416 } 417 if (pcicstatus & TX4927_PCIC_PCICSTATUS_ALL) { 418 printk(KERN_CONT "pcicstatus:%08x(", pcicstatus); 419 for (i = 0, cont = 0; i < ARRAY_SIZE(pcicstat_tbl); i++) 420 if (pcicstatus & pcicstat_tbl[i].flag) 421 printk(KERN_CONT "%s%s", 422 cont++ ? " " : "", pcicstat_tbl[i].str); 423 printk(KERN_CONT ")"); 424 } 425 printk(KERN_CONT "\n"); 426} 427 428void tx4927_report_pcic_status(void) 429{ 430 int i; 431 432 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) { 433 if (pcicptrs[i].pcicptr) 434 tx4927_report_pcic_status1(pcicptrs[i].pcicptr); 435 } 436} 437 438static void tx4927_dump_pcic_settings1(struct tx4927_pcic_reg __iomem *pcicptr) 439{ 440 int i; 441 __u32 __iomem *preg = (__u32 __iomem *)pcicptr; 442 443 printk(KERN_INFO "tx4927 pcic (0x%p) settings:", pcicptr); 444 for (i = 0; i < sizeof(struct tx4927_pcic_reg); i += 4, preg++) { 445 if (i % 32 == 0) { 446 printk(KERN_CONT "\n"); 447 printk(KERN_INFO "%04x:", i); 448 } 449 /* skip registers with side-effects */ 450 if (i == offsetof(struct tx4927_pcic_reg, g2pintack) 451 || i == offsetof(struct tx4927_pcic_reg, g2pspc) 452 || i == offsetof(struct tx4927_pcic_reg, g2pcfgadrs) 453 || i == offsetof(struct tx4927_pcic_reg, g2pcfgdata)) { 454 printk(KERN_CONT " XXXXXXXX"); 455 continue; 456 } 457 printk(KERN_CONT " %08x", __raw_readl(preg)); 458 } 459 printk(KERN_CONT "\n"); 460} 461 462void tx4927_dump_pcic_settings(void) 463{ 464 int i; 465 466 for (i = 0; i < ARRAY_SIZE(pcicptrs); i++) { 467 if (pcicptrs[i].pcicptr) 468 tx4927_dump_pcic_settings1(pcicptrs[i].pcicptr); 469 } 470} 471 472irqreturn_t tx4927_pcierr_interrupt(int irq, void *dev_id) 473{ 474 struct pt_regs *regs = get_irq_regs(); 475 struct tx4927_pcic_reg __iomem *pcicptr = 476 (struct tx4927_pcic_reg __iomem *)(unsigned long)dev_id; 477 478 if (txx9_pci_err_action != TXX9_PCI_ERR_IGNORE) { 479 printk(KERN_WARNING "PCIERR interrupt at 0x%0*lx\n", 480 (int)(2 * sizeof(unsigned long)), regs->cp0_epc); 481 tx4927_report_pcic_status1(pcicptr); 482 } 483 if (txx9_pci_err_action != TXX9_PCI_ERR_PANIC) { 484 /* clear all pci errors */ 485 __raw_writel((__raw_readl(&pcicptr->pcistatus) & 0x0000ffff) 486 | (TX4927_PCIC_PCISTATUS_ALL << 16), 487 &pcicptr->pcistatus); 488 __raw_writel(TX4927_PCIC_G2PSTATUS_ALL, &pcicptr->g2pstatus); 489 __raw_writel(TX4927_PCIC_PBASTATUS_ALL, &pcicptr->pbastatus); 490 __raw_writel(TX4927_PCIC_PCICSTATUS_ALL, &pcicptr->pcicstatus); 491 return IRQ_HANDLED; 492 } 493 console_verbose(); 494 tx4927_dump_pcic_settings1(pcicptr); 495 panic("PCI error."); 496} 497 498#ifdef CONFIG_TOSHIBA_FPCIB0 499static void tx4927_quirk_slc90e66_bridge(struct pci_dev *dev) 500{ 501 struct tx4927_pcic_reg __iomem *pcicptr = pci_bus_to_pcicptr(dev->bus); 502 503 if (!pcicptr) 504 return; 505 if (__raw_readl(&pcicptr->pbacfg) & TX4927_PCIC_PBACFG_PBAEN) { 506 /* Reset Bus Arbiter */ 507 __raw_writel(TX4927_PCIC_PBACFG_RPBA, &pcicptr->pbacfg); 508 /* 509 * swap reqBP and reqXP (raise priority of SLC90E66). 510 * SLC90E66(PCI-ISA bridge) is connected to REQ2 on 511 * PCI Backplane board. 512 */ 513 __raw_writel(0x72543610, &pcicptr->pbareqport); 514 __raw_writel(0, &pcicptr->pbabm); 515 /* Use Fixed ParkMaster (required by SLC90E66) */ 516 __raw_writel(TX4927_PCIC_PBACFG_FIXPA, &pcicptr->pbacfg); 517 /* Enable Bus Arbiter */ 518 __raw_writel(TX4927_PCIC_PBACFG_FIXPA | 519 TX4927_PCIC_PBACFG_PBAEN, 520 &pcicptr->pbacfg); 521 printk(KERN_INFO "PCI: Use Fixed Park Master (REQPORT %08x)\n", 522 __raw_readl(&pcicptr->pbareqport)); 523 } 524} 525#define PCI_DEVICE_ID_EFAR_SLC90E66_0 0x9460 526DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_0, 527 tx4927_quirk_slc90e66_bridge); 528#endif 529