1 /* 2 * leon_pci_grpci2.c: GRPCI2 Host PCI driver 3 * 4 * Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom 5 * 6 */ 7 8 #include <linux/of_device.h> 9 #include <linux/kernel.h> 10 #include <linux/pci.h> 11 #include <linux/slab.h> 12 #include <linux/delay.h> 13 #include <linux/export.h> 14 #include <asm/io.h> 15 #include <asm/leon.h> 16 #include <asm/vaddrs.h> 17 #include <asm/sections.h> 18 #include <asm/leon_pci.h> 19 20 #include "irq.h" 21 22 struct grpci2_barcfg { 23 unsigned long pciadr; /* PCI Space Address */ 24 unsigned long ahbadr; /* PCI Base address mapped to this AHB addr */ 25 }; 26 27 /* Device Node Configuration options: 28 * - barcfgs : Custom Configuration of Host's 6 target BARs 29 * - irq_mask : Limit which PCI interrupts are enabled 30 * - do_reset : Force PCI Reset on startup 31 * 32 * barcfgs 33 * ======= 34 * 35 * Optional custom Target BAR configuration (see struct grpci2_barcfg). All 36 * addresses are physical. Array always contains 6 elements (len=2*4*6 bytes) 37 * 38 * -1 means not configured (let host driver do default setup). 39 * 40 * [i*2+0] = PCI Address of BAR[i] on target interface 41 * [i*2+1] = Accessing PCI address of BAR[i] result in this AMBA address 42 * 43 * 44 * irq_mask 45 * ======== 46 * 47 * Limit which PCI interrupts are enabled. 0=Disable, 1=Enable. By default 48 * all are enabled. Use this when PCI interrupt pins are floating on PCB. 49 * int, len=4. 50 * bit0 = PCI INTA# 51 * bit1 = PCI INTB# 52 * bit2 = PCI INTC# 53 * bit3 = PCI INTD# 54 * 55 * 56 * reset 57 * ===== 58 * 59 * Force PCI reset on startup. int, len=4 60 */ 61 62 /* Enable Debugging Configuration Space Access */ 63 #undef GRPCI2_DEBUG_CFGACCESS 64 65 /* 66 * GRPCI2 APB Register MAP 67 */ 68 struct grpci2_regs { 69 unsigned int ctrl; /* 0x00 Control */ 70 unsigned int sts_cap; /* 0x04 Status / Capabilities */ 71 int res1; /* 0x08 */ 72 unsigned int io_map; /* 0x0C I/O Map address */ 73 unsigned int dma_ctrl; /* 0x10 DMA */ 74 unsigned int dma_bdbase; /* 0x14 DMA */ 75 int res2[2]; /* 0x18 */ 76 unsigned int bars[6]; /* 0x20 read-only PCI BARs */ 77 int res3[2]; /* 0x38 */ 78 unsigned int ahbmst_map[16]; /* 0x40 AHB->PCI Map per AHB Master */ 79 80 /* PCI Trace Buffer Registers (OPTIONAL) */ 81 unsigned int t_ctrl; /* 0x80 */ 82 unsigned int t_cnt; /* 0x84 */ 83 unsigned int t_adpat; /* 0x88 */ 84 unsigned int t_admask; /* 0x8C */ 85 unsigned int t_sigpat; /* 0x90 */ 86 unsigned int t_sigmask; /* 0x94 */ 87 unsigned int t_adstate; /* 0x98 */ 88 unsigned int t_sigstate; /* 0x9C */ 89 }; 90 91 #define REGLOAD(a) (be32_to_cpu(__raw_readl(&(a)))) 92 #define REGSTORE(a, v) (__raw_writel(cpu_to_be32(v), &(a))) 93 94 #define CTRL_BUS_BIT 16 95 96 #define CTRL_RESET (1<<31) 97 #define CTRL_SI (1<<27) 98 #define CTRL_PE (1<<26) 99 #define CTRL_EI (1<<25) 100 #define CTRL_ER (1<<24) 101 #define CTRL_BUS (0xff<<CTRL_BUS_BIT) 102 #define CTRL_HOSTINT 0xf 103 104 #define STS_HOST_BIT 31 105 #define STS_MST_BIT 30 106 #define STS_TAR_BIT 29 107 #define STS_DMA_BIT 28 108 #define STS_DI_BIT 27 109 #define STS_HI_BIT 26 110 #define STS_IRQMODE_BIT 24 111 #define STS_TRACE_BIT 23 112 #define STS_CFGERRVALID_BIT 20 113 #define STS_CFGERR_BIT 19 114 #define STS_INTTYPE_BIT 12 115 #define STS_INTSTS_BIT 8 116 #define STS_FDEPTH_BIT 2 117 #define STS_FNUM_BIT 0 118 119 #define STS_HOST (1<<STS_HOST_BIT) 120 #define STS_MST (1<<STS_MST_BIT) 121 #define STS_TAR (1<<STS_TAR_BIT) 122 #define STS_DMA (1<<STS_DMA_BIT) 123 #define STS_DI (1<<STS_DI_BIT) 124 #define STS_HI (1<<STS_HI_BIT) 125 #define STS_IRQMODE (0x3<<STS_IRQMODE_BIT) 126 #define STS_TRACE (1<<STS_TRACE_BIT) 127 #define STS_CFGERRVALID (1<<STS_CFGERRVALID_BIT) 128 #define STS_CFGERR (1<<STS_CFGERR_BIT) 129 #define STS_INTTYPE (0x3f<<STS_INTTYPE_BIT) 130 #define STS_INTSTS (0xf<<STS_INTSTS_BIT) 131 #define STS_FDEPTH (0x7<<STS_FDEPTH_BIT) 132 #define STS_FNUM (0x3<<STS_FNUM_BIT) 133 134 #define STS_ISYSERR (1<<17) 135 #define STS_IDMA (1<<16) 136 #define STS_IDMAERR (1<<15) 137 #define STS_IMSTABRT (1<<14) 138 #define STS_ITGTABRT (1<<13) 139 #define STS_IPARERR (1<<12) 140 141 #define STS_ERR_IRQ (STS_ISYSERR | STS_IMSTABRT | STS_ITGTABRT | STS_IPARERR) 142 143 struct grpci2_bd_chan { 144 unsigned int ctrl; /* 0x00 DMA Control */ 145 unsigned int nchan; /* 0x04 Next DMA Channel Address */ 146 unsigned int nbd; /* 0x08 Next Data Descriptor in chan */ 147 unsigned int res; /* 0x0C Reserved */ 148 }; 149 150 #define BD_CHAN_EN 0x80000000 151 #define BD_CHAN_TYPE 0x00300000 152 #define BD_CHAN_BDCNT 0x0000ffff 153 #define BD_CHAN_EN_BIT 31 154 #define BD_CHAN_TYPE_BIT 20 155 #define BD_CHAN_BDCNT_BIT 0 156 157 struct grpci2_bd_data { 158 unsigned int ctrl; /* 0x00 DMA Data Control */ 159 unsigned int pci_adr; /* 0x04 PCI Start Address */ 160 unsigned int ahb_adr; /* 0x08 AHB Start address */ 161 unsigned int next; /* 0x0C Next Data Descriptor in chan */ 162 }; 163 164 #define BD_DATA_EN 0x80000000 165 #define BD_DATA_IE 0x40000000 166 #define BD_DATA_DR 0x20000000 167 #define BD_DATA_TYPE 0x00300000 168 #define BD_DATA_ER 0x00080000 169 #define BD_DATA_LEN 0x0000ffff 170 #define BD_DATA_EN_BIT 31 171 #define BD_DATA_IE_BIT 30 172 #define BD_DATA_DR_BIT 29 173 #define BD_DATA_TYPE_BIT 20 174 #define BD_DATA_ER_BIT 19 175 #define BD_DATA_LEN_BIT 0 176 177 /* GRPCI2 Capability */ 178 struct grpci2_cap_first { 179 unsigned int ctrl; 180 unsigned int pci2ahb_map[6]; 181 unsigned int ext2ahb_map; 182 unsigned int io_map; 183 unsigned int pcibar_size[6]; 184 }; 185 #define CAP9_CTRL_OFS 0 186 #define CAP9_BAR_OFS 0x4 187 #define CAP9_IOMAP_OFS 0x20 188 #define CAP9_BARSIZE_OFS 0x24 189 190 #define TGT 256 191 192 struct grpci2_priv { 193 struct leon_pci_info info; /* must be on top of this structure */ 194 struct grpci2_regs __iomem *regs; 195 char irq; 196 char irq_mode; /* IRQ Mode from CAPSTS REG */ 197 char bt_enabled; 198 char do_reset; 199 char irq_mask; 200 u32 pciid; /* PCI ID of Host */ 201 unsigned char irq_map[4]; 202 203 /* Virtual IRQ numbers */ 204 unsigned int virq_err; 205 unsigned int virq_dma; 206 207 /* AHB PCI Windows */ 208 unsigned long pci_area; /* MEMORY */ 209 unsigned long pci_area_end; 210 unsigned long pci_io; /* I/O */ 211 unsigned long pci_conf; /* CONFIGURATION */ 212 unsigned long pci_conf_end; 213 unsigned long pci_io_va; 214 215 struct grpci2_barcfg tgtbars[6]; 216 }; 217 218 static DEFINE_SPINLOCK(grpci2_dev_lock); 219 static struct grpci2_priv *grpci2priv; 220 221 static int grpci2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 222 { 223 struct grpci2_priv *priv = dev->bus->sysdata; 224 int irq_group; 225 226 /* Use default IRQ decoding on PCI BUS0 according slot numbering */ 227 irq_group = slot & 0x3; 228 pin = ((pin - 1) + irq_group) & 0x3; 229 230 return priv->irq_map[pin]; 231 } 232 233 static int grpci2_cfg_r32(struct grpci2_priv *priv, unsigned int bus, 234 unsigned int devfn, int where, u32 *val) 235 { 236 unsigned int *pci_conf; 237 unsigned long flags; 238 u32 tmp; 239 240 if (where & 0x3) 241 return -EINVAL; 242 243 if (bus == 0) { 244 devfn += (0x8 * 6); /* start at AD16=Device0 */ 245 } else if (bus == TGT) { 246 bus = 0; 247 devfn = 0; /* special case: bridge controller itself */ 248 } 249 250 /* Select bus */ 251 spin_lock_irqsave(&grpci2_dev_lock, flags); 252 REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) | 253 (bus << 16)); 254 spin_unlock_irqrestore(&grpci2_dev_lock, flags); 255 256 /* clear old status */ 257 REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID)); 258 259 pci_conf = (unsigned int *) (priv->pci_conf | 260 (devfn << 8) | (where & 0xfc)); 261 tmp = LEON3_BYPASS_LOAD_PA(pci_conf); 262 263 /* Wait until GRPCI2 signals that CFG access is done, it should be 264 * done instantaneously unless a DMA operation is ongoing... 265 */ 266 while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0) 267 ; 268 269 if (REGLOAD(priv->regs->sts_cap) & STS_CFGERR) { 270 *val = 0xffffffff; 271 } else { 272 /* Bus always little endian (unaffected by byte-swapping) */ 273 *val = swab32(tmp); 274 } 275 276 return 0; 277 } 278 279 static int grpci2_cfg_r16(struct grpci2_priv *priv, unsigned int bus, 280 unsigned int devfn, int where, u32 *val) 281 { 282 u32 v; 283 int ret; 284 285 if (where & 0x1) 286 return -EINVAL; 287 ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); 288 *val = 0xffff & (v >> (8 * (where & 0x3))); 289 return ret; 290 } 291 292 static int grpci2_cfg_r8(struct grpci2_priv *priv, unsigned int bus, 293 unsigned int devfn, int where, u32 *val) 294 { 295 u32 v; 296 int ret; 297 298 ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); 299 *val = 0xff & (v >> (8 * (where & 3))); 300 301 return ret; 302 } 303 304 static int grpci2_cfg_w32(struct grpci2_priv *priv, unsigned int bus, 305 unsigned int devfn, int where, u32 val) 306 { 307 unsigned int *pci_conf; 308 unsigned long flags; 309 310 if (where & 0x3) 311 return -EINVAL; 312 313 if (bus == 0) { 314 devfn += (0x8 * 6); /* start at AD16=Device0 */ 315 } else if (bus == TGT) { 316 bus = 0; 317 devfn = 0; /* special case: bridge controller itself */ 318 } 319 320 /* Select bus */ 321 spin_lock_irqsave(&grpci2_dev_lock, flags); 322 REGSTORE(priv->regs->ctrl, (REGLOAD(priv->regs->ctrl) & ~(0xff << 16)) | 323 (bus << 16)); 324 spin_unlock_irqrestore(&grpci2_dev_lock, flags); 325 326 /* clear old status */ 327 REGSTORE(priv->regs->sts_cap, (STS_CFGERR | STS_CFGERRVALID)); 328 329 pci_conf = (unsigned int *) (priv->pci_conf | 330 (devfn << 8) | (where & 0xfc)); 331 LEON3_BYPASS_STORE_PA(pci_conf, swab32(val)); 332 333 /* Wait until GRPCI2 signals that CFG access is done, it should be 334 * done instantaneously unless a DMA operation is ongoing... 335 */ 336 while ((REGLOAD(priv->regs->sts_cap) & STS_CFGERRVALID) == 0) 337 ; 338 339 return 0; 340 } 341 342 static int grpci2_cfg_w16(struct grpci2_priv *priv, unsigned int bus, 343 unsigned int devfn, int where, u32 val) 344 { 345 int ret; 346 u32 v; 347 348 if (where & 0x1) 349 return -EINVAL; 350 ret = grpci2_cfg_r32(priv, bus, devfn, where&~3, &v); 351 if (ret) 352 return ret; 353 v = (v & ~(0xffff << (8 * (where & 0x3)))) | 354 ((0xffff & val) << (8 * (where & 0x3))); 355 return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v); 356 } 357 358 static int grpci2_cfg_w8(struct grpci2_priv *priv, unsigned int bus, 359 unsigned int devfn, int where, u32 val) 360 { 361 int ret; 362 u32 v; 363 364 ret = grpci2_cfg_r32(priv, bus, devfn, where & ~0x3, &v); 365 if (ret != 0) 366 return ret; 367 v = (v & ~(0xff << (8 * (where & 0x3)))) | 368 ((0xff & val) << (8 * (where & 0x3))); 369 return grpci2_cfg_w32(priv, bus, devfn, where & ~0x3, v); 370 } 371 372 /* Read from Configuration Space. When entering here the PCI layer has taken 373 * the pci_lock spinlock and IRQ is off. 374 */ 375 static int grpci2_read_config(struct pci_bus *bus, unsigned int devfn, 376 int where, int size, u32 *val) 377 { 378 struct grpci2_priv *priv = grpci2priv; 379 unsigned int busno = bus->number; 380 int ret; 381 382 if (PCI_SLOT(devfn) > 15 || busno > 255) { 383 *val = ~0; 384 return 0; 385 } 386 387 switch (size) { 388 case 1: 389 ret = grpci2_cfg_r8(priv, busno, devfn, where, val); 390 break; 391 case 2: 392 ret = grpci2_cfg_r16(priv, busno, devfn, where, val); 393 break; 394 case 4: 395 ret = grpci2_cfg_r32(priv, busno, devfn, where, val); 396 break; 397 default: 398 ret = -EINVAL; 399 break; 400 } 401 402 #ifdef GRPCI2_DEBUG_CFGACCESS 403 printk(KERN_INFO "grpci2_read_config: [%02x:%02x:%x] ofs=%d val=%x " 404 "size=%d\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), where, 405 *val, size); 406 #endif 407 408 return ret; 409 } 410 411 /* Write to Configuration Space. When entering here the PCI layer has taken 412 * the pci_lock spinlock and IRQ is off. 413 */ 414 static int grpci2_write_config(struct pci_bus *bus, unsigned int devfn, 415 int where, int size, u32 val) 416 { 417 struct grpci2_priv *priv = grpci2priv; 418 unsigned int busno = bus->number; 419 420 if (PCI_SLOT(devfn) > 15 || busno > 255) 421 return 0; 422 423 #ifdef GRPCI2_DEBUG_CFGACCESS 424 printk(KERN_INFO "grpci2_write_config: [%02x:%02x:%x] ofs=%d size=%d " 425 "val=%x\n", busno, PCI_SLOT(devfn), PCI_FUNC(devfn), 426 where, size, val); 427 #endif 428 429 switch (size) { 430 default: 431 return -EINVAL; 432 case 1: 433 return grpci2_cfg_w8(priv, busno, devfn, where, val); 434 case 2: 435 return grpci2_cfg_w16(priv, busno, devfn, where, val); 436 case 4: 437 return grpci2_cfg_w32(priv, busno, devfn, where, val); 438 } 439 } 440 441 static struct pci_ops grpci2_ops = { 442 .read = grpci2_read_config, 443 .write = grpci2_write_config, 444 }; 445 446 /* GENIRQ IRQ chip implementation for GRPCI2 irqmode=0..2. In configuration 447 * 3 where all PCI Interrupts has a separate IRQ on the system IRQ controller 448 * this is not needed and the standard IRQ controller can be used. 449 */ 450 451 static void grpci2_mask_irq(struct irq_data *data) 452 { 453 unsigned long flags; 454 unsigned int irqidx; 455 struct grpci2_priv *priv = grpci2priv; 456 457 irqidx = (unsigned int)data->chip_data - 1; 458 if (irqidx > 3) /* only mask PCI interrupts here */ 459 return; 460 461 spin_lock_irqsave(&grpci2_dev_lock, flags); 462 REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) & ~(1 << irqidx)); 463 spin_unlock_irqrestore(&grpci2_dev_lock, flags); 464 } 465 466 static void grpci2_unmask_irq(struct irq_data *data) 467 { 468 unsigned long flags; 469 unsigned int irqidx; 470 struct grpci2_priv *priv = grpci2priv; 471 472 irqidx = (unsigned int)data->chip_data - 1; 473 if (irqidx > 3) /* only unmask PCI interrupts here */ 474 return; 475 476 spin_lock_irqsave(&grpci2_dev_lock, flags); 477 REGSTORE(priv->regs->ctrl, REGLOAD(priv->regs->ctrl) | (1 << irqidx)); 478 spin_unlock_irqrestore(&grpci2_dev_lock, flags); 479 } 480 481 static unsigned int grpci2_startup_irq(struct irq_data *data) 482 { 483 grpci2_unmask_irq(data); 484 return 0; 485 } 486 487 static void grpci2_shutdown_irq(struct irq_data *data) 488 { 489 grpci2_mask_irq(data); 490 } 491 492 static struct irq_chip grpci2_irq = { 493 .name = "grpci2", 494 .irq_startup = grpci2_startup_irq, 495 .irq_shutdown = grpci2_shutdown_irq, 496 .irq_mask = grpci2_mask_irq, 497 .irq_unmask = grpci2_unmask_irq, 498 }; 499 500 /* Handle one or multiple IRQs from the PCI core */ 501 static void grpci2_pci_flow_irq(unsigned int irq, struct irq_desc *desc) 502 { 503 struct grpci2_priv *priv = grpci2priv; 504 int i, ack = 0; 505 unsigned int ctrl, sts_cap, pci_ints; 506 507 ctrl = REGLOAD(priv->regs->ctrl); 508 sts_cap = REGLOAD(priv->regs->sts_cap); 509 510 /* Error Interrupt? */ 511 if (sts_cap & STS_ERR_IRQ) { 512 generic_handle_irq(priv->virq_err); 513 ack = 1; 514 } 515 516 /* PCI Interrupt? */ 517 pci_ints = ((~sts_cap) >> STS_INTSTS_BIT) & ctrl & CTRL_HOSTINT; 518 if (pci_ints) { 519 /* Call respective PCI Interrupt handler */ 520 for (i = 0; i < 4; i++) { 521 if (pci_ints & (1 << i)) 522 generic_handle_irq(priv->irq_map[i]); 523 } 524 ack = 1; 525 } 526 527 /* 528 * Decode DMA Interrupt only when shared with Err and PCI INTX#, when 529 * the DMA is a unique IRQ the DMA interrupts doesn't end up here, they 530 * goes directly to DMA ISR. 531 */ 532 if ((priv->irq_mode == 0) && (sts_cap & (STS_IDMA | STS_IDMAERR))) { 533 generic_handle_irq(priv->virq_dma); 534 ack = 1; 535 } 536 537 /* 538 * Call "first level" IRQ chip end-of-irq handler. It will ACK LEON IRQ 539 * Controller, this must be done after IRQ sources have been handled to 540 * avoid double IRQ generation 541 */ 542 if (ack) 543 desc->irq_data.chip->irq_eoi(&desc->irq_data); 544 } 545 546 /* Create a virtual IRQ */ 547 static unsigned int grpci2_build_device_irq(unsigned int irq) 548 { 549 unsigned int virq = 0, pil; 550 551 pil = 1 << 8; 552 virq = irq_alloc(irq, pil); 553 if (virq == 0) 554 goto out; 555 556 irq_set_chip_and_handler_name(virq, &grpci2_irq, handle_simple_irq, 557 "pcilvl"); 558 irq_set_chip_data(virq, (void *)irq); 559 560 out: 561 return virq; 562 } 563 564 static void grpci2_hw_init(struct grpci2_priv *priv) 565 { 566 u32 ahbadr, pciadr, bar_sz, capptr, io_map, data; 567 struct grpci2_regs __iomem *regs = priv->regs; 568 int i; 569 struct grpci2_barcfg *barcfg = priv->tgtbars; 570 571 /* Reset any earlier setup */ 572 if (priv->do_reset) { 573 printk(KERN_INFO "GRPCI2: Resetting PCI bus\n"); 574 REGSTORE(regs->ctrl, CTRL_RESET); 575 ssleep(1); /* Wait for boards to settle */ 576 } 577 REGSTORE(regs->ctrl, 0); 578 REGSTORE(regs->sts_cap, ~0); /* Clear Status */ 579 REGSTORE(regs->dma_ctrl, 0); 580 REGSTORE(regs->dma_bdbase, 0); 581 582 /* Translate I/O accesses to 0, I/O Space always @ PCI low 64Kbytes */ 583 REGSTORE(regs->io_map, REGLOAD(regs->io_map) & 0x0000ffff); 584 585 /* set 1:1 mapping between AHB -> PCI memory space, for all Masters 586 * Each AHB master has it's own mapping registers. Max 16 AHB masters. 587 */ 588 for (i = 0; i < 16; i++) 589 REGSTORE(regs->ahbmst_map[i], priv->pci_area); 590 591 /* Get the GRPCI2 Host PCI ID */ 592 grpci2_cfg_r32(priv, TGT, 0, PCI_VENDOR_ID, &priv->pciid); 593 594 /* Get address to first (always defined) capability structure */ 595 grpci2_cfg_r8(priv, TGT, 0, PCI_CAPABILITY_LIST, &capptr); 596 597 /* Enable/Disable Byte twisting */ 598 grpci2_cfg_r32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, &io_map); 599 io_map = (io_map & ~0x1) | (priv->bt_enabled ? 1 : 0); 600 grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_IOMAP_OFS, io_map); 601 602 /* Setup the Host's PCI Target BARs for other peripherals to access, 603 * and do DMA to the host's memory. The target BARs can be sized and 604 * enabled individually. 605 * 606 * User may set custom target BARs, but default is: 607 * The first BARs is used to map kernel low (DMA is part of normal 608 * region on sparc which is SRMMU_MAXMEM big) main memory 1:1 to the 609 * PCI bus, the other BARs are disabled. We assume that the first BAR 610 * is always available. 611 */ 612 for (i = 0; i < 6; i++) { 613 if (barcfg[i].pciadr != ~0 && barcfg[i].ahbadr != ~0) { 614 /* Target BARs must have the proper alignment */ 615 ahbadr = barcfg[i].ahbadr; 616 pciadr = barcfg[i].pciadr; 617 bar_sz = ((pciadr - 1) & ~pciadr) + 1; 618 } else { 619 if (i == 0) { 620 /* Map main memory */ 621 bar_sz = 0xf0000008; /* 256MB prefetchable */ 622 ahbadr = 0xf0000000 & (u32)__pa(PAGE_ALIGN( 623 (unsigned long) &_end)); 624 pciadr = ahbadr; 625 } else { 626 bar_sz = 0; 627 ahbadr = 0; 628 pciadr = 0; 629 } 630 } 631 grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BARSIZE_OFS+i*4, 632 bar_sz); 633 grpci2_cfg_w32(priv, TGT, 0, PCI_BASE_ADDRESS_0+i*4, pciadr); 634 grpci2_cfg_w32(priv, TGT, 0, capptr+CAP9_BAR_OFS+i*4, ahbadr); 635 printk(KERN_INFO " TGT BAR[%d]: 0x%08x (PCI)-> 0x%08x\n", 636 i, pciadr, ahbadr); 637 } 638 639 /* set as bus master and enable pci memory responses */ 640 grpci2_cfg_r32(priv, TGT, 0, PCI_COMMAND, &data); 641 data |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER); 642 grpci2_cfg_w32(priv, TGT, 0, PCI_COMMAND, data); 643 644 /* Enable Error respone (CPU-TRAP) on illegal memory access. */ 645 REGSTORE(regs->ctrl, CTRL_ER | CTRL_PE); 646 } 647 648 static irqreturn_t grpci2_jump_interrupt(int irq, void *arg) 649 { 650 printk(KERN_ERR "GRPCI2: Jump IRQ happened\n"); 651 return IRQ_NONE; 652 } 653 654 /* Handle GRPCI2 Error Interrupt */ 655 static irqreturn_t grpci2_err_interrupt(int irq, void *arg) 656 { 657 struct grpci2_priv *priv = arg; 658 struct grpci2_regs __iomem *regs = priv->regs; 659 unsigned int status; 660 661 status = REGLOAD(regs->sts_cap); 662 if ((status & STS_ERR_IRQ) == 0) 663 return IRQ_NONE; 664 665 if (status & STS_IPARERR) 666 printk(KERN_ERR "GRPCI2: Parity Error\n"); 667 668 if (status & STS_ITGTABRT) 669 printk(KERN_ERR "GRPCI2: Target Abort\n"); 670 671 if (status & STS_IMSTABRT) 672 printk(KERN_ERR "GRPCI2: Master Abort\n"); 673 674 if (status & STS_ISYSERR) 675 printk(KERN_ERR "GRPCI2: System Error\n"); 676 677 /* Clear handled INT TYPE IRQs */ 678 REGSTORE(regs->sts_cap, status & STS_ERR_IRQ); 679 680 return IRQ_HANDLED; 681 } 682 683 static int grpci2_of_probe(struct platform_device *ofdev) 684 { 685 struct grpci2_regs __iomem *regs; 686 struct grpci2_priv *priv; 687 int err, i, len; 688 const int *tmp; 689 unsigned int capability; 690 691 if (grpci2priv) { 692 printk(KERN_ERR "GRPCI2: only one GRPCI2 core supported\n"); 693 return -ENODEV; 694 } 695 696 if (ofdev->num_resources < 3) { 697 printk(KERN_ERR "GRPCI2: not enough APB/AHB resources\n"); 698 return -EIO; 699 } 700 701 /* Find Device Address */ 702 regs = of_ioremap(&ofdev->resource[0], 0, 703 resource_size(&ofdev->resource[0]), 704 "grlib-grpci2 regs"); 705 if (regs == NULL) { 706 printk(KERN_ERR "GRPCI2: ioremap failed\n"); 707 return -EIO; 708 } 709 710 /* 711 * Check that we're in Host Slot and that we can act as a Host Bridge 712 * and not only as target. 713 */ 714 capability = REGLOAD(regs->sts_cap); 715 if ((capability & STS_HOST) || !(capability & STS_MST)) { 716 printk(KERN_INFO "GRPCI2: not in host system slot\n"); 717 err = -EIO; 718 goto err1; 719 } 720 721 priv = grpci2priv = kzalloc(sizeof(struct grpci2_priv), GFP_KERNEL); 722 if (grpci2priv == NULL) { 723 err = -ENOMEM; 724 goto err1; 725 } 726 memset(grpci2priv, 0, sizeof(*grpci2priv)); 727 priv->regs = regs; 728 priv->irq = ofdev->archdata.irqs[0]; /* BASE IRQ */ 729 priv->irq_mode = (capability & STS_IRQMODE) >> STS_IRQMODE_BIT; 730 731 printk(KERN_INFO "GRPCI2: host found at %p, irq%d\n", regs, priv->irq); 732 733 /* Byte twisting should be made configurable from kernel command line */ 734 priv->bt_enabled = 1; 735 736 /* Let user do custom Target BAR assignment */ 737 tmp = of_get_property(ofdev->dev.of_node, "barcfg", &len); 738 if (tmp && (len == 2*4*6)) 739 memcpy(priv->tgtbars, tmp, 2*4*6); 740 else 741 memset(priv->tgtbars, -1, 2*4*6); 742 743 /* Limit IRQ unmasking in irq_mode 2 and 3 */ 744 tmp = of_get_property(ofdev->dev.of_node, "irq_mask", &len); 745 if (tmp && (len == 4)) 746 priv->do_reset = *tmp; 747 else 748 priv->irq_mask = 0xf; 749 750 /* Optional PCI reset. Force PCI reset on startup */ 751 tmp = of_get_property(ofdev->dev.of_node, "reset", &len); 752 if (tmp && (len == 4)) 753 priv->do_reset = *tmp; 754 else 755 priv->do_reset = 0; 756 757 /* Find PCI Memory, I/O and Configuration Space Windows */ 758 priv->pci_area = ofdev->resource[1].start; 759 priv->pci_area_end = ofdev->resource[1].end+1; 760 priv->pci_io = ofdev->resource[2].start; 761 priv->pci_conf = ofdev->resource[2].start + 0x10000; 762 priv->pci_conf_end = priv->pci_conf + 0x10000; 763 priv->pci_io_va = (unsigned long)ioremap(priv->pci_io, 0x10000); 764 if (!priv->pci_io_va) { 765 err = -EIO; 766 goto err2; 767 } 768 769 printk(KERN_INFO 770 "GRPCI2: MEMORY SPACE [0x%08lx - 0x%08lx]\n" 771 " I/O SPACE [0x%08lx - 0x%08lx]\n" 772 " CONFIG SPACE [0x%08lx - 0x%08lx]\n", 773 priv->pci_area, priv->pci_area_end-1, 774 priv->pci_io, priv->pci_conf-1, 775 priv->pci_conf, priv->pci_conf_end-1); 776 777 /* 778 * I/O Space resources in I/O Window mapped into Virtual Adr Space 779 * We never use low 4KB because some devices seem have problems using 780 * address 0. 781 */ 782 memset(&priv->info.io_space, 0, sizeof(struct resource)); 783 priv->info.io_space.name = "GRPCI2 PCI I/O Space"; 784 priv->info.io_space.start = priv->pci_io_va + 0x1000; 785 priv->info.io_space.end = priv->pci_io_va + 0x10000 - 1; 786 priv->info.io_space.flags = IORESOURCE_IO; 787 788 /* 789 * GRPCI2 has no prefetchable memory, map everything as 790 * non-prefetchable memory 791 */ 792 memset(&priv->info.mem_space, 0, sizeof(struct resource)); 793 priv->info.mem_space.name = "GRPCI2 PCI MEM Space"; 794 priv->info.mem_space.start = priv->pci_area; 795 priv->info.mem_space.end = priv->pci_area_end - 1; 796 priv->info.mem_space.flags = IORESOURCE_MEM; 797 798 if (request_resource(&iomem_resource, &priv->info.mem_space) < 0) 799 goto err3; 800 if (request_resource(&ioport_resource, &priv->info.io_space) < 0) 801 goto err4; 802 803 /* setup maximum supported PCI buses */ 804 priv->info.busn.name = "GRPCI2 busn"; 805 priv->info.busn.start = 0; 806 priv->info.busn.end = 255; 807 808 grpci2_hw_init(priv); 809 810 /* 811 * Get PCI Interrupt to System IRQ mapping and setup IRQ handling 812 * Error IRQ always on PCI INTA. 813 */ 814 if (priv->irq_mode < 2) { 815 /* All PCI interrupts are shared using the same system IRQ */ 816 leon_update_virq_handling(priv->irq, grpci2_pci_flow_irq, 817 "pcilvl", 0); 818 819 priv->irq_map[0] = grpci2_build_device_irq(1); 820 priv->irq_map[1] = grpci2_build_device_irq(2); 821 priv->irq_map[2] = grpci2_build_device_irq(3); 822 priv->irq_map[3] = grpci2_build_device_irq(4); 823 824 priv->virq_err = grpci2_build_device_irq(5); 825 if (priv->irq_mode & 1) 826 priv->virq_dma = ofdev->archdata.irqs[1]; 827 else 828 priv->virq_dma = grpci2_build_device_irq(6); 829 830 /* Enable IRQs on LEON IRQ controller */ 831 err = request_irq(priv->irq, grpci2_jump_interrupt, 0, 832 "GRPCI2_JUMP", priv); 833 if (err) 834 printk(KERN_ERR "GRPCI2: ERR IRQ request failed\n"); 835 } else { 836 /* All PCI interrupts have an unique IRQ interrupt */ 837 for (i = 0; i < 4; i++) { 838 /* Make LEON IRQ layer handle level IRQ by acking */ 839 leon_update_virq_handling(ofdev->archdata.irqs[i], 840 handle_fasteoi_irq, "pcilvl", 841 1); 842 priv->irq_map[i] = ofdev->archdata.irqs[i]; 843 } 844 priv->virq_err = priv->irq_map[0]; 845 if (priv->irq_mode & 1) 846 priv->virq_dma = ofdev->archdata.irqs[4]; 847 else 848 priv->virq_dma = priv->irq_map[0]; 849 850 /* Unmask all PCI interrupts, request_irq will not do that */ 851 REGSTORE(regs->ctrl, REGLOAD(regs->ctrl)|(priv->irq_mask&0xf)); 852 } 853 854 /* Setup IRQ handler for non-configuration space access errors */ 855 err = request_irq(priv->virq_err, grpci2_err_interrupt, IRQF_SHARED, 856 "GRPCI2_ERR", priv); 857 if (err) { 858 printk(KERN_DEBUG "GRPCI2: ERR VIRQ request failed: %d\n", err); 859 goto err5; 860 } 861 862 /* 863 * Enable Error Interrupts. PCI interrupts are unmasked once request_irq 864 * is called by the PCI Device drivers 865 */ 866 REGSTORE(regs->ctrl, REGLOAD(regs->ctrl) | CTRL_EI | CTRL_SI); 867 868 /* Init common layer and scan buses */ 869 priv->info.ops = &grpci2_ops; 870 priv->info.map_irq = grpci2_map_irq; 871 leon_pci_init(ofdev, &priv->info); 872 873 return 0; 874 875 err5: 876 release_resource(&priv->info.io_space); 877 err4: 878 release_resource(&priv->info.mem_space); 879 err3: 880 err = -ENOMEM; 881 iounmap((void __iomem *)priv->pci_io_va); 882 err2: 883 kfree(priv); 884 err1: 885 of_iounmap(&ofdev->resource[0], regs, 886 resource_size(&ofdev->resource[0])); 887 return err; 888 } 889 890 static struct of_device_id grpci2_of_match[] = { 891 { 892 .name = "GAISLER_GRPCI2", 893 }, 894 { 895 .name = "01_07c", 896 }, 897 {}, 898 }; 899 900 static struct platform_driver grpci2_of_driver = { 901 .driver = { 902 .name = "grpci2", 903 .of_match_table = grpci2_of_match, 904 }, 905 .probe = grpci2_of_probe, 906 }; 907 908 static int __init grpci2_init(void) 909 { 910 return platform_driver_register(&grpci2_of_driver); 911 } 912 913 subsys_initcall(grpci2_init); 914