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 22struct 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 */ 68struct 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 143struct 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 157struct 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 */ 178struct 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 192struct 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 218static DEFINE_SPINLOCK(grpci2_dev_lock); 219static struct grpci2_priv *grpci2priv; 220 221static 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 233static 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 279static 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 292static 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 304static 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 342static 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 358static 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 */ 375static 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 */ 414static 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 441static 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 451static 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 466static 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 481static unsigned int grpci2_startup_irq(struct irq_data *data) 482{ 483 grpci2_unmask_irq(data); 484 return 0; 485} 486 487static void grpci2_shutdown_irq(struct irq_data *data) 488{ 489 grpci2_mask_irq(data); 490} 491 492static 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 */ 501static 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 */ 547static 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 560out: 561 return virq; 562} 563 564static 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 648static 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 */ 655static 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 683static 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 priv->regs = regs; 727 priv->irq = ofdev->archdata.irqs[0]; /* BASE IRQ */ 728 priv->irq_mode = (capability & STS_IRQMODE) >> STS_IRQMODE_BIT; 729 730 printk(KERN_INFO "GRPCI2: host found at %p, irq%d\n", regs, priv->irq); 731 732 /* Byte twisting should be made configurable from kernel command line */ 733 priv->bt_enabled = 1; 734 735 /* Let user do custom Target BAR assignment */ 736 tmp = of_get_property(ofdev->dev.of_node, "barcfg", &len); 737 if (tmp && (len == 2*4*6)) 738 memcpy(priv->tgtbars, tmp, 2*4*6); 739 else 740 memset(priv->tgtbars, -1, 2*4*6); 741 742 /* Limit IRQ unmasking in irq_mode 2 and 3 */ 743 tmp = of_get_property(ofdev->dev.of_node, "irq_mask", &len); 744 if (tmp && (len == 4)) 745 priv->do_reset = *tmp; 746 else 747 priv->irq_mask = 0xf; 748 749 /* Optional PCI reset. Force PCI reset on startup */ 750 tmp = of_get_property(ofdev->dev.of_node, "reset", &len); 751 if (tmp && (len == 4)) 752 priv->do_reset = *tmp; 753 else 754 priv->do_reset = 0; 755 756 /* Find PCI Memory, I/O and Configuration Space Windows */ 757 priv->pci_area = ofdev->resource[1].start; 758 priv->pci_area_end = ofdev->resource[1].end+1; 759 priv->pci_io = ofdev->resource[2].start; 760 priv->pci_conf = ofdev->resource[2].start + 0x10000; 761 priv->pci_conf_end = priv->pci_conf + 0x10000; 762 priv->pci_io_va = (unsigned long)ioremap(priv->pci_io, 0x10000); 763 if (!priv->pci_io_va) { 764 err = -EIO; 765 goto err2; 766 } 767 768 printk(KERN_INFO 769 "GRPCI2: MEMORY SPACE [0x%08lx - 0x%08lx]\n" 770 " I/O SPACE [0x%08lx - 0x%08lx]\n" 771 " CONFIG SPACE [0x%08lx - 0x%08lx]\n", 772 priv->pci_area, priv->pci_area_end-1, 773 priv->pci_io, priv->pci_conf-1, 774 priv->pci_conf, priv->pci_conf_end-1); 775 776 /* 777 * I/O Space resources in I/O Window mapped into Virtual Adr Space 778 * We never use low 4KB because some devices seem have problems using 779 * address 0. 780 */ 781 memset(&priv->info.io_space, 0, sizeof(struct resource)); 782 priv->info.io_space.name = "GRPCI2 PCI I/O Space"; 783 priv->info.io_space.start = priv->pci_io_va + 0x1000; 784 priv->info.io_space.end = priv->pci_io_va + 0x10000 - 1; 785 priv->info.io_space.flags = IORESOURCE_IO; 786 787 /* 788 * GRPCI2 has no prefetchable memory, map everything as 789 * non-prefetchable memory 790 */ 791 memset(&priv->info.mem_space, 0, sizeof(struct resource)); 792 priv->info.mem_space.name = "GRPCI2 PCI MEM Space"; 793 priv->info.mem_space.start = priv->pci_area; 794 priv->info.mem_space.end = priv->pci_area_end - 1; 795 priv->info.mem_space.flags = IORESOURCE_MEM; 796 797 if (request_resource(&iomem_resource, &priv->info.mem_space) < 0) 798 goto err3; 799 if (request_resource(&ioport_resource, &priv->info.io_space) < 0) 800 goto err4; 801 802 /* setup maximum supported PCI buses */ 803 priv->info.busn.name = "GRPCI2 busn"; 804 priv->info.busn.start = 0; 805 priv->info.busn.end = 255; 806 807 grpci2_hw_init(priv); 808 809 /* 810 * Get PCI Interrupt to System IRQ mapping and setup IRQ handling 811 * Error IRQ always on PCI INTA. 812 */ 813 if (priv->irq_mode < 2) { 814 /* All PCI interrupts are shared using the same system IRQ */ 815 leon_update_virq_handling(priv->irq, grpci2_pci_flow_irq, 816 "pcilvl", 0); 817 818 priv->irq_map[0] = grpci2_build_device_irq(1); 819 priv->irq_map[1] = grpci2_build_device_irq(2); 820 priv->irq_map[2] = grpci2_build_device_irq(3); 821 priv->irq_map[3] = grpci2_build_device_irq(4); 822 823 priv->virq_err = grpci2_build_device_irq(5); 824 if (priv->irq_mode & 1) 825 priv->virq_dma = ofdev->archdata.irqs[1]; 826 else 827 priv->virq_dma = grpci2_build_device_irq(6); 828 829 /* Enable IRQs on LEON IRQ controller */ 830 err = request_irq(priv->irq, grpci2_jump_interrupt, 0, 831 "GRPCI2_JUMP", priv); 832 if (err) 833 printk(KERN_ERR "GRPCI2: ERR IRQ request failed\n"); 834 } else { 835 /* All PCI interrupts have an unique IRQ interrupt */ 836 for (i = 0; i < 4; i++) { 837 /* Make LEON IRQ layer handle level IRQ by acking */ 838 leon_update_virq_handling(ofdev->archdata.irqs[i], 839 handle_fasteoi_irq, "pcilvl", 840 1); 841 priv->irq_map[i] = ofdev->archdata.irqs[i]; 842 } 843 priv->virq_err = priv->irq_map[0]; 844 if (priv->irq_mode & 1) 845 priv->virq_dma = ofdev->archdata.irqs[4]; 846 else 847 priv->virq_dma = priv->irq_map[0]; 848 849 /* Unmask all PCI interrupts, request_irq will not do that */ 850 REGSTORE(regs->ctrl, REGLOAD(regs->ctrl)|(priv->irq_mask&0xf)); 851 } 852 853 /* Setup IRQ handler for non-configuration space access errors */ 854 err = request_irq(priv->virq_err, grpci2_err_interrupt, IRQF_SHARED, 855 "GRPCI2_ERR", priv); 856 if (err) { 857 printk(KERN_DEBUG "GRPCI2: ERR VIRQ request failed: %d\n", err); 858 goto err5; 859 } 860 861 /* 862 * Enable Error Interrupts. PCI interrupts are unmasked once request_irq 863 * is called by the PCI Device drivers 864 */ 865 REGSTORE(regs->ctrl, REGLOAD(regs->ctrl) | CTRL_EI | CTRL_SI); 866 867 /* Init common layer and scan buses */ 868 priv->info.ops = &grpci2_ops; 869 priv->info.map_irq = grpci2_map_irq; 870 leon_pci_init(ofdev, &priv->info); 871 872 return 0; 873 874err5: 875 release_resource(&priv->info.io_space); 876err4: 877 release_resource(&priv->info.mem_space); 878err3: 879 err = -ENOMEM; 880 iounmap((void __iomem *)priv->pci_io_va); 881err2: 882 kfree(priv); 883err1: 884 of_iounmap(&ofdev->resource[0], regs, 885 resource_size(&ofdev->resource[0])); 886 return err; 887} 888 889static struct of_device_id grpci2_of_match[] = { 890 { 891 .name = "GAISLER_GRPCI2", 892 }, 893 { 894 .name = "01_07c", 895 }, 896 {}, 897}; 898 899static struct platform_driver grpci2_of_driver = { 900 .driver = { 901 .name = "grpci2", 902 .of_match_table = grpci2_of_match, 903 }, 904 .probe = grpci2_of_probe, 905}; 906 907static int __init grpci2_init(void) 908{ 909 return platform_driver_register(&grpci2_of_driver); 910} 911 912subsys_initcall(grpci2_init); 913