1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file "COPYING" in the main directory of this archive 4 * for more details. 5 * 6 * Copyright (C) 2005-2009 Cavium Networks 7 */ 8 #include <linux/kernel.h> 9 #include <linux/init.h> 10 #include <linux/pci.h> 11 #include <linux/interrupt.h> 12 #include <linux/time.h> 13 #include <linux/delay.h> 14 #include <linux/platform_device.h> 15 #include <linux/swiotlb.h> 16 17 #include <asm/time.h> 18 19 #include <asm/octeon/octeon.h> 20 #include <asm/octeon/cvmx-npi-defs.h> 21 #include <asm/octeon/cvmx-pci-defs.h> 22 #include <asm/octeon/pci-octeon.h> 23 24 #include <dma-coherence.h> 25 26 #define USE_OCTEON_INTERNAL_ARBITER 27 28 /* 29 * Octeon's PCI controller uses did=3, subdid=2 for PCI IO 30 * addresses. Use PCI endian swapping 1 so no address swapping is 31 * necessary. The Linux io routines will endian swap the data. 32 */ 33 #define OCTEON_PCI_IOSPACE_BASE 0x80011a0400000000ull 34 #define OCTEON_PCI_IOSPACE_SIZE (1ull<<32) 35 36 /* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */ 37 #define OCTEON_PCI_MEMSPACE_OFFSET (0x00011b0000000000ull) 38 39 u64 octeon_bar1_pci_phys; 40 41 /** 42 * This is the bit decoding used for the Octeon PCI controller addresses 43 */ 44 union octeon_pci_address { 45 uint64_t u64; 46 struct { 47 uint64_t upper:2; 48 uint64_t reserved:13; 49 uint64_t io:1; 50 uint64_t did:5; 51 uint64_t subdid:3; 52 uint64_t reserved2:4; 53 uint64_t endian_swap:2; 54 uint64_t reserved3:10; 55 uint64_t bus:8; 56 uint64_t dev:5; 57 uint64_t func:3; 58 uint64_t reg:8; 59 } s; 60 }; 61 62 int __initconst (*octeon_pcibios_map_irq)(const struct pci_dev *dev, 63 u8 slot, u8 pin); 64 enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID; 65 66 /** 67 * Map a PCI device to the appropriate interrupt line 68 * 69 * @dev: The Linux PCI device structure for the device to map 70 * @slot: The slot number for this device on __BUS 0__. Linux 71 * enumerates through all the bridges and figures out the 72 * slot on Bus 0 where this device eventually hooks to. 73 * @pin: The PCI interrupt pin read from the device, then swizzled 74 * as it goes through each bridge. 75 * Returns Interrupt number for the device 76 */ 77 int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 78 { 79 if (octeon_pcibios_map_irq) 80 return octeon_pcibios_map_irq(dev, slot, pin); 81 else 82 panic("octeon_pcibios_map_irq not set."); 83 } 84 85 86 /* 87 * Called to perform platform specific PCI setup 88 */ 89 int pcibios_plat_dev_init(struct pci_dev *dev) 90 { 91 uint16_t config; 92 uint32_t dconfig; 93 int pos; 94 /* 95 * Force the Cache line setting to 64 bytes. The standard 96 * Linux bus scan doesn't seem to set it. Octeon really has 97 * 128 byte lines, but Intel bridges get really upset if you 98 * try and set values above 64 bytes. Value is specified in 99 * 32bit words. 100 */ 101 pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 / 4); 102 /* Set latency timers for all devices */ 103 pci_write_config_byte(dev, PCI_LATENCY_TIMER, 64); 104 105 /* Enable reporting System errors and parity errors on all devices */ 106 /* Enable parity checking and error reporting */ 107 pci_read_config_word(dev, PCI_COMMAND, &config); 108 config |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR; 109 pci_write_config_word(dev, PCI_COMMAND, config); 110 111 if (dev->subordinate) { 112 /* Set latency timers on sub bridges */ 113 pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 64); 114 /* More bridge error detection */ 115 pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &config); 116 config |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR; 117 pci_write_config_word(dev, PCI_BRIDGE_CONTROL, config); 118 } 119 120 /* Enable the PCIe normal error reporting */ 121 config = PCI_EXP_DEVCTL_CERE; /* Correctable Error Reporting */ 122 config |= PCI_EXP_DEVCTL_NFERE; /* Non-Fatal Error Reporting */ 123 config |= PCI_EXP_DEVCTL_FERE; /* Fatal Error Reporting */ 124 config |= PCI_EXP_DEVCTL_URRE; /* Unsupported Request */ 125 pcie_capability_set_word(dev, PCI_EXP_DEVCTL, config); 126 127 /* Find the Advanced Error Reporting capability */ 128 pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR); 129 if (pos) { 130 /* Clear Uncorrectable Error Status */ 131 pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, 132 &dconfig); 133 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS, 134 dconfig); 135 /* Enable reporting of all uncorrectable errors */ 136 /* Uncorrectable Error Mask - turned on bits disable errors */ 137 pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, 0); 138 /* 139 * Leave severity at HW default. This only controls if 140 * errors are reported as uncorrectable or 141 * correctable, not if the error is reported. 142 */ 143 /* PCI_ERR_UNCOR_SEVER - Uncorrectable Error Severity */ 144 /* Clear Correctable Error Status */ 145 pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &dconfig); 146 pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, dconfig); 147 /* Enable reporting of all correctable errors */ 148 /* Correctable Error Mask - turned on bits disable errors */ 149 pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, 0); 150 /* Advanced Error Capabilities */ 151 pci_read_config_dword(dev, pos + PCI_ERR_CAP, &dconfig); 152 /* ECRC Generation Enable */ 153 if (config & PCI_ERR_CAP_ECRC_GENC) 154 config |= PCI_ERR_CAP_ECRC_GENE; 155 /* ECRC Check Enable */ 156 if (config & PCI_ERR_CAP_ECRC_CHKC) 157 config |= PCI_ERR_CAP_ECRC_CHKE; 158 pci_write_config_dword(dev, pos + PCI_ERR_CAP, dconfig); 159 /* PCI_ERR_HEADER_LOG - Header Log Register (16 bytes) */ 160 /* Report all errors to the root complex */ 161 pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, 162 PCI_ERR_ROOT_CMD_COR_EN | 163 PCI_ERR_ROOT_CMD_NONFATAL_EN | 164 PCI_ERR_ROOT_CMD_FATAL_EN); 165 /* Clear the Root status register */ 166 pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &dconfig); 167 pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig); 168 } 169 170 dev->dev.archdata.dma_ops = octeon_pci_dma_map_ops; 171 172 return 0; 173 } 174 175 /** 176 * Return the mapping of PCI device number to IRQ line. Each 177 * character in the return string represents the interrupt 178 * line for the device at that position. Device 1 maps to the 179 * first character, etc. The characters A-D are used for PCI 180 * interrupts. 181 * 182 * Returns PCI interrupt mapping 183 */ 184 const char *octeon_get_pci_interrupts(void) 185 { 186 /* 187 * Returning an empty string causes the interrupts to be 188 * routed based on the PCI specification. From the PCI spec: 189 * 190 * INTA# of Device Number 0 is connected to IRQW on the system 191 * board. (Device Number has no significance regarding being 192 * located on the system board or in a connector.) INTA# of 193 * Device Number 1 is connected to IRQX on the system 194 * board. INTA# of Device Number 2 is connected to IRQY on the 195 * system board. INTA# of Device Number 3 is connected to IRQZ 196 * on the system board. The table below describes how each 197 * agent's INTx# lines are connected to the system board 198 * interrupt lines. The following equation can be used to 199 * determine to which INTx# signal on the system board a given 200 * device's INTx# line(s) is connected. 201 * 202 * MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0, 203 * IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I = 204 * Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and 205 * INTD# = 3) 206 */ 207 switch (octeon_bootinfo->board_type) { 208 case CVMX_BOARD_TYPE_NAO38: 209 /* This is really the NAC38 */ 210 return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA"; 211 case CVMX_BOARD_TYPE_EBH3100: 212 case CVMX_BOARD_TYPE_CN3010_EVB_HS5: 213 case CVMX_BOARD_TYPE_CN3005_EVB_HS5: 214 return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA"; 215 case CVMX_BOARD_TYPE_BBGW_REF: 216 return "AABCD"; 217 case CVMX_BOARD_TYPE_THUNDER: 218 case CVMX_BOARD_TYPE_EBH3000: 219 default: 220 return ""; 221 } 222 } 223 224 /** 225 * Map a PCI device to the appropriate interrupt line 226 * 227 * @dev: The Linux PCI device structure for the device to map 228 * @slot: The slot number for this device on __BUS 0__. Linux 229 * enumerates through all the bridges and figures out the 230 * slot on Bus 0 where this device eventually hooks to. 231 * @pin: The PCI interrupt pin read from the device, then swizzled 232 * as it goes through each bridge. 233 * Returns Interrupt number for the device 234 */ 235 int __init octeon_pci_pcibios_map_irq(const struct pci_dev *dev, 236 u8 slot, u8 pin) 237 { 238 int irq_num; 239 const char *interrupts; 240 int dev_num; 241 242 /* Get the board specific interrupt mapping */ 243 interrupts = octeon_get_pci_interrupts(); 244 245 dev_num = dev->devfn >> 3; 246 if (dev_num < strlen(interrupts)) 247 irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) + 248 OCTEON_IRQ_PCI_INT0; 249 else 250 irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0; 251 return irq_num; 252 } 253 254 255 /* 256 * Read a value from configuration space 257 */ 258 static int octeon_read_config(struct pci_bus *bus, unsigned int devfn, 259 int reg, int size, u32 *val) 260 { 261 union octeon_pci_address pci_addr; 262 263 pci_addr.u64 = 0; 264 pci_addr.s.upper = 2; 265 pci_addr.s.io = 1; 266 pci_addr.s.did = 3; 267 pci_addr.s.subdid = 1; 268 pci_addr.s.endian_swap = 1; 269 pci_addr.s.bus = bus->number; 270 pci_addr.s.dev = devfn >> 3; 271 pci_addr.s.func = devfn & 0x7; 272 pci_addr.s.reg = reg; 273 274 #if PCI_CONFIG_SPACE_DELAY 275 udelay(PCI_CONFIG_SPACE_DELAY); 276 #endif 277 switch (size) { 278 case 4: 279 *val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64)); 280 return PCIBIOS_SUCCESSFUL; 281 case 2: 282 *val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64)); 283 return PCIBIOS_SUCCESSFUL; 284 case 1: 285 *val = cvmx_read64_uint8(pci_addr.u64); 286 return PCIBIOS_SUCCESSFUL; 287 } 288 return PCIBIOS_FUNC_NOT_SUPPORTED; 289 } 290 291 292 /* 293 * Write a value to PCI configuration space 294 */ 295 static int octeon_write_config(struct pci_bus *bus, unsigned int devfn, 296 int reg, int size, u32 val) 297 { 298 union octeon_pci_address pci_addr; 299 300 pci_addr.u64 = 0; 301 pci_addr.s.upper = 2; 302 pci_addr.s.io = 1; 303 pci_addr.s.did = 3; 304 pci_addr.s.subdid = 1; 305 pci_addr.s.endian_swap = 1; 306 pci_addr.s.bus = bus->number; 307 pci_addr.s.dev = devfn >> 3; 308 pci_addr.s.func = devfn & 0x7; 309 pci_addr.s.reg = reg; 310 311 #if PCI_CONFIG_SPACE_DELAY 312 udelay(PCI_CONFIG_SPACE_DELAY); 313 #endif 314 switch (size) { 315 case 4: 316 cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val)); 317 return PCIBIOS_SUCCESSFUL; 318 case 2: 319 cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val)); 320 return PCIBIOS_SUCCESSFUL; 321 case 1: 322 cvmx_write64_uint8(pci_addr.u64, val); 323 return PCIBIOS_SUCCESSFUL; 324 } 325 return PCIBIOS_FUNC_NOT_SUPPORTED; 326 } 327 328 329 static struct pci_ops octeon_pci_ops = { 330 octeon_read_config, 331 octeon_write_config, 332 }; 333 334 static struct resource octeon_pci_mem_resource = { 335 .start = 0, 336 .end = 0, 337 .name = "Octeon PCI MEM", 338 .flags = IORESOURCE_MEM, 339 }; 340 341 /* 342 * PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI 343 * bridge 344 */ 345 static struct resource octeon_pci_io_resource = { 346 .start = 0x4000, 347 .end = OCTEON_PCI_IOSPACE_SIZE - 1, 348 .name = "Octeon PCI IO", 349 .flags = IORESOURCE_IO, 350 }; 351 352 static struct pci_controller octeon_pci_controller = { 353 .pci_ops = &octeon_pci_ops, 354 .mem_resource = &octeon_pci_mem_resource, 355 .mem_offset = OCTEON_PCI_MEMSPACE_OFFSET, 356 .io_resource = &octeon_pci_io_resource, 357 .io_offset = 0, 358 .io_map_base = OCTEON_PCI_IOSPACE_BASE, 359 }; 360 361 362 /* 363 * Low level initialize the Octeon PCI controller 364 */ 365 static void octeon_pci_initialize(void) 366 { 367 union cvmx_pci_cfg01 cfg01; 368 union cvmx_npi_ctl_status ctl_status; 369 union cvmx_pci_ctl_status_2 ctl_status_2; 370 union cvmx_pci_cfg19 cfg19; 371 union cvmx_pci_cfg16 cfg16; 372 union cvmx_pci_cfg22 cfg22; 373 union cvmx_pci_cfg56 cfg56; 374 375 /* Reset the PCI Bus */ 376 cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1); 377 cvmx_read_csr(CVMX_CIU_SOFT_PRST); 378 379 udelay(2000); /* Hold PCI reset for 2 ms */ 380 381 ctl_status.u64 = 0; /* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */ 382 ctl_status.s.max_word = 1; 383 ctl_status.s.timer = 1; 384 cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64); 385 386 /* Deassert PCI reset and advertize PCX Host Mode Device Capability 387 (64b) */ 388 cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4); 389 cvmx_read_csr(CVMX_CIU_SOFT_PRST); 390 391 udelay(2000); /* Wait 2 ms after deasserting PCI reset */ 392 393 ctl_status_2.u32 = 0; 394 ctl_status_2.s.tsr_hwm = 1; /* Initializes to 0. Must be set 395 before any PCI reads. */ 396 ctl_status_2.s.bar2pres = 1; /* Enable BAR2 */ 397 ctl_status_2.s.bar2_enb = 1; 398 ctl_status_2.s.bar2_cax = 1; /* Don't use L2 */ 399 ctl_status_2.s.bar2_esx = 1; 400 ctl_status_2.s.pmo_amod = 1; /* Round robin priority */ 401 if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) { 402 /* BAR1 hole */ 403 ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS; 404 ctl_status_2.s.bb1_siz = 1; /* BAR1 is 2GB */ 405 ctl_status_2.s.bb_ca = 1; /* Don't use L2 with big bars */ 406 ctl_status_2.s.bb_es = 1; /* Big bar in byte swap mode */ 407 ctl_status_2.s.bb1 = 1; /* BAR1 is big */ 408 ctl_status_2.s.bb0 = 1; /* BAR0 is big */ 409 } 410 411 octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32); 412 udelay(2000); /* Wait 2 ms before doing PCI reads */ 413 414 ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2); 415 pr_notice("PCI Status: %s %s-bit\n", 416 ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI", 417 ctl_status_2.s.ap_64ad ? "64" : "32"); 418 419 if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) { 420 union cvmx_pci_cnt_reg cnt_reg_start; 421 union cvmx_pci_cnt_reg cnt_reg_end; 422 unsigned long cycles, pci_clock; 423 424 cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG); 425 cycles = read_c0_cvmcount(); 426 udelay(1000); 427 cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG); 428 cycles = read_c0_cvmcount() - cycles; 429 pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) / 430 (cycles / (mips_hpt_frequency / 1000000)); 431 pr_notice("PCI Clock: %lu MHz\n", pci_clock); 432 } 433 434 /* 435 * TDOMC must be set to one in PCI mode. TDOMC should be set to 4 436 * in PCI-X mode to allow four outstanding splits. Otherwise, 437 * should not change from its reset value. Don't write PCI_CFG19 438 * in PCI mode (0x82000001 reset value), write it to 0x82000004 439 * after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero. 440 * MRBCM -> must be one. 441 */ 442 if (ctl_status_2.s.ap_pcix) { 443 cfg19.u32 = 0; 444 /* 445 * Target Delayed/Split request outstanding maximum 446 * count. [1..31] and 0=32. NOTE: If the user 447 * programs these bits beyond the Designed Maximum 448 * outstanding count, then the designed maximum table 449 * depth will be used instead. No additional 450 * Deferred/Split transactions will be accepted if 451 * this outstanding maximum count is 452 * reached. Furthermore, no additional deferred/split 453 * transactions will be accepted if the I/O delay/ I/O 454 * Split Request outstanding maximum is reached. 455 */ 456 cfg19.s.tdomc = 4; 457 /* 458 * Master Deferred Read Request Outstanding Max Count 459 * (PCI only). CR4C[26:24] Max SAC cycles MAX DAC 460 * cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101 461 * 5 2 110 6 3 111 7 3 For example, if these bits are 462 * programmed to 100, the core can support 2 DAC 463 * cycles, 4 SAC cycles or a combination of 1 DAC and 464 * 2 SAC cycles. NOTE: For the PCI-X maximum 465 * outstanding split transactions, refer to 466 * CRE0[22:20]. 467 */ 468 cfg19.s.mdrrmc = 2; 469 /* 470 * Master Request (Memory Read) Byte Count/Byte Enable 471 * select. 0 = Byte Enables valid. In PCI mode, a 472 * burst transaction cannot be performed using Memory 473 * Read command=4?h6. 1 = DWORD Byte Count valid 474 * (default). In PCI Mode, the memory read byte 475 * enables are automatically generated by the 476 * core. Note: N3 Master Request transaction sizes are 477 * always determined through the 478 * am_attr[<35:32>|<7:0>] field. 479 */ 480 cfg19.s.mrbcm = 1; 481 octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32); 482 } 483 484 485 cfg01.u32 = 0; 486 cfg01.s.msae = 1; /* Memory Space Access Enable */ 487 cfg01.s.me = 1; /* Master Enable */ 488 cfg01.s.pee = 1; /* PERR# Enable */ 489 cfg01.s.see = 1; /* System Error Enable */ 490 cfg01.s.fbbe = 1; /* Fast Back to Back Transaction Enable */ 491 492 octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32); 493 494 #ifdef USE_OCTEON_INTERNAL_ARBITER 495 /* 496 * When OCTEON is a PCI host, most systems will use OCTEON's 497 * internal arbiter, so must enable it before any PCI/PCI-X 498 * traffic can occur. 499 */ 500 { 501 union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg; 502 503 pci_int_arb_cfg.u64 = 0; 504 pci_int_arb_cfg.s.en = 1; /* Internal arbiter enable */ 505 cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64); 506 } 507 #endif /* USE_OCTEON_INTERNAL_ARBITER */ 508 509 /* 510 * Preferably written to 1 to set MLTD. [RDSATI,TRTAE, 511 * TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to 512 * 1..7. 513 */ 514 cfg16.u32 = 0; 515 cfg16.s.mltd = 1; /* Master Latency Timer Disable */ 516 octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32); 517 518 /* 519 * Should be written to 0x4ff00. MTTV -> must be zero. 520 * FLUSH -> must be 1. MRV -> should be 0xFF. 521 */ 522 cfg22.u32 = 0; 523 /* Master Retry Value [1..255] and 0=infinite */ 524 cfg22.s.mrv = 0xff; 525 /* 526 * AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper 527 * N3K operation. 528 */ 529 cfg22.s.flush = 1; 530 octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32); 531 532 /* 533 * MOST Indicates the maximum number of outstanding splits (in -1 534 * notation) when OCTEON is in PCI-X mode. PCI-X performance is 535 * affected by the MOST selection. Should generally be written 536 * with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807, 537 * depending on the desired MOST of 3, 2, 1, or 0, respectively. 538 */ 539 cfg56.u32 = 0; 540 cfg56.s.pxcid = 7; /* RO - PCI-X Capability ID */ 541 cfg56.s.ncp = 0xe8; /* RO - Next Capability Pointer */ 542 cfg56.s.dpere = 1; /* Data Parity Error Recovery Enable */ 543 cfg56.s.roe = 1; /* Relaxed Ordering Enable */ 544 cfg56.s.mmbc = 1; /* Maximum Memory Byte Count 545 [0=512B,1=1024B,2=2048B,3=4096B] */ 546 cfg56.s.most = 3; /* Maximum outstanding Split transactions [0=1 547 .. 7=32] */ 548 549 octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32); 550 551 /* 552 * Affects PCI performance when OCTEON services reads to its 553 * BAR1/BAR2. Refer to Section 10.6.1. The recommended values are 554 * 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and 555 * PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700, 556 * these values need to be changed so they won't possibly prefetch off 557 * of the end of memory if PCI is DMAing a buffer at the end of 558 * memory. Note that these values differ from their reset values. 559 */ 560 octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_6, 0x21); 561 octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_C, 0x31); 562 octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_E, 0x31); 563 } 564 565 566 /* 567 * Initialize the Octeon PCI controller 568 */ 569 static int __init octeon_pci_setup(void) 570 { 571 union cvmx_npi_mem_access_subidx mem_access; 572 int index; 573 574 /* Only these chips have PCI */ 575 if (octeon_has_feature(OCTEON_FEATURE_PCIE)) 576 return 0; 577 578 /* Point pcibios_map_irq() to the PCI version of it */ 579 octeon_pcibios_map_irq = octeon_pci_pcibios_map_irq; 580 581 /* Only use the big bars on chips that support it */ 582 if (OCTEON_IS_MODEL(OCTEON_CN31XX) || 583 OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) || 584 OCTEON_IS_MODEL(OCTEON_CN38XX_PASS1)) 585 octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_SMALL; 586 else 587 octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_BIG; 588 589 if (!octeon_is_pci_host()) { 590 pr_notice("Not in host mode, PCI Controller not initialized\n"); 591 return 0; 592 } 593 594 /* PCI I/O and PCI MEM values */ 595 set_io_port_base(OCTEON_PCI_IOSPACE_BASE); 596 ioport_resource.start = 0; 597 ioport_resource.end = OCTEON_PCI_IOSPACE_SIZE - 1; 598 599 pr_notice("%s Octeon big bar support\n", 600 (octeon_dma_bar_type == 601 OCTEON_DMA_BAR_TYPE_BIG) ? "Enabling" : "Disabling"); 602 603 octeon_pci_initialize(); 604 605 mem_access.u64 = 0; 606 mem_access.s.esr = 1; /* Endian-Swap on read. */ 607 mem_access.s.esw = 1; /* Endian-Swap on write. */ 608 mem_access.s.nsr = 0; /* No-Snoop on read. */ 609 mem_access.s.nsw = 0; /* No-Snoop on write. */ 610 mem_access.s.ror = 0; /* Relax Read on read. */ 611 mem_access.s.row = 0; /* Relax Order on write. */ 612 mem_access.s.ba = 0; /* PCI Address bits [63:36]. */ 613 cvmx_write_csr(CVMX_NPI_MEM_ACCESS_SUBID3, mem_access.u64); 614 615 /* 616 * Remap the Octeon BAR 2 above all 32 bit devices 617 * (0x8000000000ul). This is done here so it is remapped 618 * before the readl()'s below. We don't want BAR2 overlapping 619 * with BAR0/BAR1 during these reads. 620 */ 621 octeon_npi_write32(CVMX_NPI_PCI_CFG08, 622 (u32)(OCTEON_BAR2_PCI_ADDRESS & 0xffffffffull)); 623 octeon_npi_write32(CVMX_NPI_PCI_CFG09, 624 (u32)(OCTEON_BAR2_PCI_ADDRESS >> 32)); 625 626 if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) { 627 /* Remap the Octeon BAR 0 to 0-2GB */ 628 octeon_npi_write32(CVMX_NPI_PCI_CFG04, 0); 629 octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0); 630 631 /* 632 * Remap the Octeon BAR 1 to map 2GB-4GB (minus the 633 * BAR 1 hole). 634 */ 635 octeon_npi_write32(CVMX_NPI_PCI_CFG06, 2ul << 30); 636 octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0); 637 638 /* BAR1 movable mappings set for identity mapping */ 639 octeon_bar1_pci_phys = 0x80000000ull; 640 for (index = 0; index < 32; index++) { 641 union cvmx_pci_bar1_indexx bar1_index; 642 643 bar1_index.u32 = 0; 644 /* Address bits[35:22] sent to L2C */ 645 bar1_index.s.addr_idx = 646 (octeon_bar1_pci_phys >> 22) + index; 647 /* Don't put PCI accesses in L2. */ 648 bar1_index.s.ca = 1; 649 /* Endian Swap Mode */ 650 bar1_index.s.end_swp = 1; 651 /* Set '1' when the selected address range is valid. */ 652 bar1_index.s.addr_v = 1; 653 octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 654 bar1_index.u32); 655 } 656 657 /* Devices go after BAR1 */ 658 octeon_pci_mem_resource.start = 659 OCTEON_PCI_MEMSPACE_OFFSET + (4ul << 30) - 660 (OCTEON_PCI_BAR1_HOLE_SIZE << 20); 661 octeon_pci_mem_resource.end = 662 octeon_pci_mem_resource.start + (1ul << 30); 663 } else { 664 /* Remap the Octeon BAR 0 to map 128MB-(128MB+4KB) */ 665 octeon_npi_write32(CVMX_NPI_PCI_CFG04, 128ul << 20); 666 octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0); 667 668 /* Remap the Octeon BAR 1 to map 0-128MB */ 669 octeon_npi_write32(CVMX_NPI_PCI_CFG06, 0); 670 octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0); 671 672 /* BAR1 movable regions contiguous to cover the swiotlb */ 673 octeon_bar1_pci_phys = 674 virt_to_phys(octeon_swiotlb) & ~((1ull << 22) - 1); 675 676 for (index = 0; index < 32; index++) { 677 union cvmx_pci_bar1_indexx bar1_index; 678 679 bar1_index.u32 = 0; 680 /* Address bits[35:22] sent to L2C */ 681 bar1_index.s.addr_idx = 682 (octeon_bar1_pci_phys >> 22) + index; 683 /* Don't put PCI accesses in L2. */ 684 bar1_index.s.ca = 1; 685 /* Endian Swap Mode */ 686 bar1_index.s.end_swp = 1; 687 /* Set '1' when the selected address range is valid. */ 688 bar1_index.s.addr_v = 1; 689 octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index), 690 bar1_index.u32); 691 } 692 693 /* Devices go after BAR0 */ 694 octeon_pci_mem_resource.start = 695 OCTEON_PCI_MEMSPACE_OFFSET + (128ul << 20) + 696 (4ul << 10); 697 octeon_pci_mem_resource.end = 698 octeon_pci_mem_resource.start + (1ul << 30); 699 } 700 701 register_pci_controller(&octeon_pci_controller); 702 703 /* 704 * Clear any errors that might be pending from before the bus 705 * was setup properly. 706 */ 707 cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1); 708 709 if (IS_ERR(platform_device_register_simple("octeon_pci_edac", 710 -1, NULL, 0))) 711 pr_err("Registration of co_pci_edac failed!\n"); 712 713 octeon_pci_dma_init(); 714 715 return 0; 716 } 717 718 arch_initcall(octeon_pci_setup); 719