linux/arch/mips/pci/pcie-octeon.c
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   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) 2007, 2008, 2009, 2010, 2011 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/module.h>
  15
  16#include <asm/octeon/octeon.h>
  17#include <asm/octeon/cvmx-npei-defs.h>
  18#include <asm/octeon/cvmx-pciercx-defs.h>
  19#include <asm/octeon/cvmx-pescx-defs.h>
  20#include <asm/octeon/cvmx-pexp-defs.h>
  21#include <asm/octeon/cvmx-pemx-defs.h>
  22#include <asm/octeon/cvmx-dpi-defs.h>
  23#include <asm/octeon/cvmx-sli-defs.h>
  24#include <asm/octeon/cvmx-sriox-defs.h>
  25#include <asm/octeon/cvmx-helper-errata.h>
  26#include <asm/octeon/pci-octeon.h>
  27
  28#define MRRS_CN5XXX 0 /* 128 byte Max Read Request Size */
  29#define MPS_CN5XXX  0 /* 128 byte Max Packet Size (Limit of most PCs) */
  30#define MRRS_CN6XXX 3 /* 1024 byte Max Read Request Size */
  31#define MPS_CN6XXX  0 /* 128 byte Max Packet Size (Limit of most PCs) */
  32
  33/* Module parameter to disable PCI probing */
  34static int pcie_disable;
  35module_param(pcie_disable, int, S_IRUGO);
  36
  37static int enable_pcie_14459_war;
  38static int enable_pcie_bus_num_war[2];
  39
  40union cvmx_pcie_address {
  41        uint64_t u64;
  42        struct {
  43                uint64_t upper:2;       /* Normally 2 for XKPHYS */
  44                uint64_t reserved_49_61:13;     /* Must be zero */
  45                uint64_t io:1;  /* 1 for IO space access */
  46                uint64_t did:5; /* PCIe DID = 3 */
  47                uint64_t subdid:3;      /* PCIe SubDID = 1 */
  48                uint64_t reserved_36_39:4;      /* Must be zero */
  49                uint64_t es:2;  /* Endian swap = 1 */
  50                uint64_t port:2;        /* PCIe port 0,1 */
  51                uint64_t reserved_29_31:3;      /* Must be zero */
  52                /*
  53                 * Selects the type of the configuration request (0 = type 0,
  54                 * 1 = type 1).
  55                 */
  56                uint64_t ty:1;
  57                /* Target bus number sent in the ID in the request. */
  58                uint64_t bus:8;
  59                /*
  60                 * Target device number sent in the ID in the
  61                 * request. Note that Dev must be zero for type 0
  62                 * configuration requests.
  63                 */
  64                uint64_t dev:5;
  65                /* Target function number sent in the ID in the request. */
  66                uint64_t func:3;
  67                /*
  68                 * Selects a register in the configuration space of
  69                 * the target.
  70                 */
  71                uint64_t reg:12;
  72        } config;
  73        struct {
  74                uint64_t upper:2;       /* Normally 2 for XKPHYS */
  75                uint64_t reserved_49_61:13;     /* Must be zero */
  76                uint64_t io:1;  /* 1 for IO space access */
  77                uint64_t did:5; /* PCIe DID = 3 */
  78                uint64_t subdid:3;      /* PCIe SubDID = 2 */
  79                uint64_t reserved_36_39:4;      /* Must be zero */
  80                uint64_t es:2;  /* Endian swap = 1 */
  81                uint64_t port:2;        /* PCIe port 0,1 */
  82                uint64_t address:32;    /* PCIe IO address */
  83        } io;
  84        struct {
  85                uint64_t upper:2;       /* Normally 2 for XKPHYS */
  86                uint64_t reserved_49_61:13;     /* Must be zero */
  87                uint64_t io:1;  /* 1 for IO space access */
  88                uint64_t did:5; /* PCIe DID = 3 */
  89                uint64_t subdid:3;      /* PCIe SubDID = 3-6 */
  90                uint64_t reserved_36_39:4;      /* Must be zero */
  91                uint64_t address:36;    /* PCIe Mem address */
  92        } mem;
  93};
  94
  95static int cvmx_pcie_rc_initialize(int pcie_port);
  96
  97#include <dma-coherence.h>
  98
  99/**
 100 * Return the Core virtual base address for PCIe IO access. IOs are
 101 * read/written as an offset from this address.
 102 *
 103 * @pcie_port: PCIe port the IO is for
 104 *
 105 * Returns 64bit Octeon IO base address for read/write
 106 */
 107static inline uint64_t cvmx_pcie_get_io_base_address(int pcie_port)
 108{
 109        union cvmx_pcie_address pcie_addr;
 110        pcie_addr.u64 = 0;
 111        pcie_addr.io.upper = 0;
 112        pcie_addr.io.io = 1;
 113        pcie_addr.io.did = 3;
 114        pcie_addr.io.subdid = 2;
 115        pcie_addr.io.es = 1;
 116        pcie_addr.io.port = pcie_port;
 117        return pcie_addr.u64;
 118}
 119
 120/**
 121 * Size of the IO address region returned at address
 122 * cvmx_pcie_get_io_base_address()
 123 *
 124 * @pcie_port: PCIe port the IO is for
 125 *
 126 * Returns Size of the IO window
 127 */
 128static inline uint64_t cvmx_pcie_get_io_size(int pcie_port)
 129{
 130        return 1ull << 32;
 131}
 132
 133/**
 134 * Return the Core virtual base address for PCIe MEM access. Memory is
 135 * read/written as an offset from this address.
 136 *
 137 * @pcie_port: PCIe port the IO is for
 138 *
 139 * Returns 64bit Octeon IO base address for read/write
 140 */
 141static inline uint64_t cvmx_pcie_get_mem_base_address(int pcie_port)
 142{
 143        union cvmx_pcie_address pcie_addr;
 144        pcie_addr.u64 = 0;
 145        pcie_addr.mem.upper = 0;
 146        pcie_addr.mem.io = 1;
 147        pcie_addr.mem.did = 3;
 148        pcie_addr.mem.subdid = 3 + pcie_port;
 149        return pcie_addr.u64;
 150}
 151
 152/**
 153 * Size of the Mem address region returned at address
 154 * cvmx_pcie_get_mem_base_address()
 155 *
 156 * @pcie_port: PCIe port the IO is for
 157 *
 158 * Returns Size of the Mem window
 159 */
 160static inline uint64_t cvmx_pcie_get_mem_size(int pcie_port)
 161{
 162        return 1ull << 36;
 163}
 164
 165/**
 166 * Read a PCIe config space register indirectly. This is used for
 167 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
 168 *
 169 * @pcie_port:  PCIe port to read from
 170 * @cfg_offset: Address to read
 171 *
 172 * Returns Value read
 173 */
 174static uint32_t cvmx_pcie_cfgx_read(int pcie_port, uint32_t cfg_offset)
 175{
 176        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
 177                union cvmx_pescx_cfg_rd pescx_cfg_rd;
 178                pescx_cfg_rd.u64 = 0;
 179                pescx_cfg_rd.s.addr = cfg_offset;
 180                cvmx_write_csr(CVMX_PESCX_CFG_RD(pcie_port), pescx_cfg_rd.u64);
 181                pescx_cfg_rd.u64 = cvmx_read_csr(CVMX_PESCX_CFG_RD(pcie_port));
 182                return pescx_cfg_rd.s.data;
 183        } else {
 184                union cvmx_pemx_cfg_rd pemx_cfg_rd;
 185                pemx_cfg_rd.u64 = 0;
 186                pemx_cfg_rd.s.addr = cfg_offset;
 187                cvmx_write_csr(CVMX_PEMX_CFG_RD(pcie_port), pemx_cfg_rd.u64);
 188                pemx_cfg_rd.u64 = cvmx_read_csr(CVMX_PEMX_CFG_RD(pcie_port));
 189                return pemx_cfg_rd.s.data;
 190        }
 191}
 192
 193/**
 194 * Write a PCIe config space register indirectly. This is used for
 195 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
 196 *
 197 * @pcie_port:  PCIe port to write to
 198 * @cfg_offset: Address to write
 199 * @val:        Value to write
 200 */
 201static void cvmx_pcie_cfgx_write(int pcie_port, uint32_t cfg_offset,
 202                                 uint32_t val)
 203{
 204        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
 205                union cvmx_pescx_cfg_wr pescx_cfg_wr;
 206                pescx_cfg_wr.u64 = 0;
 207                pescx_cfg_wr.s.addr = cfg_offset;
 208                pescx_cfg_wr.s.data = val;
 209                cvmx_write_csr(CVMX_PESCX_CFG_WR(pcie_port), pescx_cfg_wr.u64);
 210        } else {
 211                union cvmx_pemx_cfg_wr pemx_cfg_wr;
 212                pemx_cfg_wr.u64 = 0;
 213                pemx_cfg_wr.s.addr = cfg_offset;
 214                pemx_cfg_wr.s.data = val;
 215                cvmx_write_csr(CVMX_PEMX_CFG_WR(pcie_port), pemx_cfg_wr.u64);
 216        }
 217}
 218
 219/**
 220 * Build a PCIe config space request address for a device
 221 *
 222 * @pcie_port: PCIe port to access
 223 * @bus:       Sub bus
 224 * @dev:       Device ID
 225 * @fn:        Device sub function
 226 * @reg:       Register to access
 227 *
 228 * Returns 64bit Octeon IO address
 229 */
 230static inline uint64_t __cvmx_pcie_build_config_addr(int pcie_port, int bus,
 231                                                     int dev, int fn, int reg)
 232{
 233        union cvmx_pcie_address pcie_addr;
 234        union cvmx_pciercx_cfg006 pciercx_cfg006;
 235
 236        pciercx_cfg006.u32 =
 237            cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG006(pcie_port));
 238        if ((bus <= pciercx_cfg006.s.pbnum) && (dev != 0))
 239                return 0;
 240
 241        pcie_addr.u64 = 0;
 242        pcie_addr.config.upper = 2;
 243        pcie_addr.config.io = 1;
 244        pcie_addr.config.did = 3;
 245        pcie_addr.config.subdid = 1;
 246        pcie_addr.config.es = 1;
 247        pcie_addr.config.port = pcie_port;
 248        pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum);
 249        pcie_addr.config.bus = bus;
 250        pcie_addr.config.dev = dev;
 251        pcie_addr.config.func = fn;
 252        pcie_addr.config.reg = reg;
 253        return pcie_addr.u64;
 254}
 255
 256/**
 257 * Read 8bits from a Device's config space
 258 *
 259 * @pcie_port: PCIe port the device is on
 260 * @bus:       Sub bus
 261 * @dev:       Device ID
 262 * @fn:        Device sub function
 263 * @reg:       Register to access
 264 *
 265 * Returns Result of the read
 266 */
 267static uint8_t cvmx_pcie_config_read8(int pcie_port, int bus, int dev,
 268                                      int fn, int reg)
 269{
 270        uint64_t address =
 271            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 272        if (address)
 273                return cvmx_read64_uint8(address);
 274        else
 275                return 0xff;
 276}
 277
 278/**
 279 * Read 16bits from a Device's config space
 280 *
 281 * @pcie_port: PCIe port the device is on
 282 * @bus:       Sub bus
 283 * @dev:       Device ID
 284 * @fn:        Device sub function
 285 * @reg:       Register to access
 286 *
 287 * Returns Result of the read
 288 */
 289static uint16_t cvmx_pcie_config_read16(int pcie_port, int bus, int dev,
 290                                        int fn, int reg)
 291{
 292        uint64_t address =
 293            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 294        if (address)
 295                return le16_to_cpu(cvmx_read64_uint16(address));
 296        else
 297                return 0xffff;
 298}
 299
 300/**
 301 * Read 32bits from a Device's config space
 302 *
 303 * @pcie_port: PCIe port the device is on
 304 * @bus:       Sub bus
 305 * @dev:       Device ID
 306 * @fn:        Device sub function
 307 * @reg:       Register to access
 308 *
 309 * Returns Result of the read
 310 */
 311static uint32_t cvmx_pcie_config_read32(int pcie_port, int bus, int dev,
 312                                        int fn, int reg)
 313{
 314        uint64_t address =
 315            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 316        if (address)
 317                return le32_to_cpu(cvmx_read64_uint32(address));
 318        else
 319                return 0xffffffff;
 320}
 321
 322/**
 323 * Write 8bits to a Device's config space
 324 *
 325 * @pcie_port: PCIe port the device is on
 326 * @bus:       Sub bus
 327 * @dev:       Device ID
 328 * @fn:        Device sub function
 329 * @reg:       Register to access
 330 * @val:       Value to write
 331 */
 332static void cvmx_pcie_config_write8(int pcie_port, int bus, int dev, int fn,
 333                                    int reg, uint8_t val)
 334{
 335        uint64_t address =
 336            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 337        if (address)
 338                cvmx_write64_uint8(address, val);
 339}
 340
 341/**
 342 * Write 16bits to a Device's config space
 343 *
 344 * @pcie_port: PCIe port the device is on
 345 * @bus:       Sub bus
 346 * @dev:       Device ID
 347 * @fn:        Device sub function
 348 * @reg:       Register to access
 349 * @val:       Value to write
 350 */
 351static void cvmx_pcie_config_write16(int pcie_port, int bus, int dev, int fn,
 352                                     int reg, uint16_t val)
 353{
 354        uint64_t address =
 355            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 356        if (address)
 357                cvmx_write64_uint16(address, cpu_to_le16(val));
 358}
 359
 360/**
 361 * Write 32bits to a Device's config space
 362 *
 363 * @pcie_port: PCIe port the device is on
 364 * @bus:       Sub bus
 365 * @dev:       Device ID
 366 * @fn:        Device sub function
 367 * @reg:       Register to access
 368 * @val:       Value to write
 369 */
 370static void cvmx_pcie_config_write32(int pcie_port, int bus, int dev, int fn,
 371                                     int reg, uint32_t val)
 372{
 373        uint64_t address =
 374            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
 375        if (address)
 376                cvmx_write64_uint32(address, cpu_to_le32(val));
 377}
 378
 379/**
 380 * Initialize the RC config space CSRs
 381 *
 382 * @pcie_port: PCIe port to initialize
 383 */
 384static void __cvmx_pcie_rc_initialize_config_space(int pcie_port)
 385{
 386        union cvmx_pciercx_cfg030 pciercx_cfg030;
 387        union cvmx_pciercx_cfg070 pciercx_cfg070;
 388        union cvmx_pciercx_cfg001 pciercx_cfg001;
 389        union cvmx_pciercx_cfg032 pciercx_cfg032;
 390        union cvmx_pciercx_cfg006 pciercx_cfg006;
 391        union cvmx_pciercx_cfg008 pciercx_cfg008;
 392        union cvmx_pciercx_cfg009 pciercx_cfg009;
 393        union cvmx_pciercx_cfg010 pciercx_cfg010;
 394        union cvmx_pciercx_cfg011 pciercx_cfg011;
 395        union cvmx_pciercx_cfg035 pciercx_cfg035;
 396        union cvmx_pciercx_cfg075 pciercx_cfg075;
 397        union cvmx_pciercx_cfg034 pciercx_cfg034;
 398
 399        /* Max Payload Size (PCIE*_CFG030[MPS]) */
 400        /* Max Read Request Size (PCIE*_CFG030[MRRS]) */
 401        /* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */
 402        /* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */
 403
 404        pciercx_cfg030.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG030(pcie_port));
 405        if (OCTEON_IS_MODEL(OCTEON_CN5XXX)) {
 406                pciercx_cfg030.s.mps = MPS_CN5XXX;
 407                pciercx_cfg030.s.mrrs = MRRS_CN5XXX;
 408        } else {
 409                pciercx_cfg030.s.mps = MPS_CN6XXX;
 410                pciercx_cfg030.s.mrrs = MRRS_CN6XXX;
 411        }
 412        /*
 413         * Enable relaxed order processing. This will allow devices to
 414         * affect read response ordering.
 415         */
 416        pciercx_cfg030.s.ro_en = 1;
 417        /* Enable no snoop processing. Not used by Octeon */
 418        pciercx_cfg030.s.ns_en = 1;
 419        /* Correctable error reporting enable. */
 420        pciercx_cfg030.s.ce_en = 1;
 421        /* Non-fatal error reporting enable. */
 422        pciercx_cfg030.s.nfe_en = 1;
 423        /* Fatal error reporting enable. */
 424        pciercx_cfg030.s.fe_en = 1;
 425        /* Unsupported request reporting enable. */
 426        pciercx_cfg030.s.ur_en = 1;
 427        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG030(pcie_port), pciercx_cfg030.u32);
 428
 429
 430        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
 431                union cvmx_npei_ctl_status2 npei_ctl_status2;
 432                /*
 433                 * Max Payload Size (NPEI_CTL_STATUS2[MPS]) must match
 434                 * PCIE*_CFG030[MPS].  Max Read Request Size
 435                 * (NPEI_CTL_STATUS2[MRRS]) must not exceed
 436                 * PCIE*_CFG030[MRRS]
 437                 */
 438                npei_ctl_status2.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS2);
 439                /* Max payload size = 128 bytes for best Octeon DMA performance */
 440                npei_ctl_status2.s.mps = MPS_CN5XXX;
 441                /* Max read request size = 128 bytes for best Octeon DMA performance */
 442                npei_ctl_status2.s.mrrs = MRRS_CN5XXX;
 443                if (pcie_port)
 444                        npei_ctl_status2.s.c1_b1_s = 3; /* Port1 BAR1 Size 256MB */
 445                else
 446                        npei_ctl_status2.s.c0_b1_s = 3; /* Port0 BAR1 Size 256MB */
 447
 448                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS2, npei_ctl_status2.u64);
 449        } else {
 450                /*
 451                 * Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match
 452                 * PCIE*_CFG030[MPS].  Max Read Request Size
 453                 * (DPI_SLI_PRTX_CFG[MRRS]) must not exceed
 454                 * PCIE*_CFG030[MRRS].
 455                 */
 456                union cvmx_dpi_sli_prtx_cfg prt_cfg;
 457                union cvmx_sli_s2m_portx_ctl sli_s2m_portx_ctl;
 458                prt_cfg.u64 = cvmx_read_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port));
 459                prt_cfg.s.mps = MPS_CN6XXX;
 460                prt_cfg.s.mrrs = MRRS_CN6XXX;
 461                /* Max outstanding load request. */
 462                prt_cfg.s.molr = 32;
 463                cvmx_write_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64);
 464
 465                sli_s2m_portx_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port));
 466                sli_s2m_portx_ctl.s.mrrs = MRRS_CN6XXX;
 467                cvmx_write_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.u64);
 468        }
 469
 470        /* ECRC Generation (PCIE*_CFG070[GE,CE]) */
 471        pciercx_cfg070.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG070(pcie_port));
 472        pciercx_cfg070.s.ge = 1;        /* ECRC generation enable. */
 473        pciercx_cfg070.s.ce = 1;        /* ECRC check enable. */
 474        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG070(pcie_port), pciercx_cfg070.u32);
 475
 476        /*
 477         * Access Enables (PCIE*_CFG001[MSAE,ME])
 478         * ME and MSAE should always be set.
 479         * Interrupt Disable (PCIE*_CFG001[I_DIS])
 480         * System Error Message Enable (PCIE*_CFG001[SEE])
 481         */
 482        pciercx_cfg001.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG001(pcie_port));
 483        pciercx_cfg001.s.msae = 1;      /* Memory space enable. */
 484        pciercx_cfg001.s.me = 1;        /* Bus master enable. */
 485        pciercx_cfg001.s.i_dis = 1;     /* INTx assertion disable. */
 486        pciercx_cfg001.s.see = 1;       /* SERR# enable */
 487        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG001(pcie_port), pciercx_cfg001.u32);
 488
 489        /* Advanced Error Recovery Message Enables */
 490        /* (PCIE*_CFG066,PCIE*_CFG067,PCIE*_CFG069) */
 491        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG066(pcie_port), 0);
 492        /* Use CVMX_PCIERCX_CFG067 hardware default */
 493        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG069(pcie_port), 0);
 494
 495
 496        /* Active State Power Management (PCIE*_CFG032[ASLPC]) */
 497        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
 498        pciercx_cfg032.s.aslpc = 0; /* Active state Link PM control. */
 499        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG032(pcie_port), pciercx_cfg032.u32);
 500
 501        /*
 502         * Link Width Mode (PCIERCn_CFG452[LME]) - Set during
 503         * cvmx_pcie_rc_initialize_link()
 504         *
 505         * Primary Bus Number (PCIERCn_CFG006[PBNUM])
 506         *
 507         * We set the primary bus number to 1 so IDT bridges are
 508         * happy. They don't like zero.
 509         */
 510        pciercx_cfg006.u32 = 0;
 511        pciercx_cfg006.s.pbnum = 1;
 512        pciercx_cfg006.s.sbnum = 1;
 513        pciercx_cfg006.s.subbnum = 1;
 514        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG006(pcie_port), pciercx_cfg006.u32);
 515
 516
 517        /*
 518         * Memory-mapped I/O BAR (PCIERCn_CFG008)
 519         * Most applications should disable the memory-mapped I/O BAR by
 520         * setting PCIERCn_CFG008[ML_ADDR] < PCIERCn_CFG008[MB_ADDR]
 521         */
 522        pciercx_cfg008.u32 = 0;
 523        pciercx_cfg008.s.mb_addr = 0x100;
 524        pciercx_cfg008.s.ml_addr = 0;
 525        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG008(pcie_port), pciercx_cfg008.u32);
 526
 527
 528        /*
 529         * Prefetchable BAR (PCIERCn_CFG009,PCIERCn_CFG010,PCIERCn_CFG011)
 530         * Most applications should disable the prefetchable BAR by setting
 531         * PCIERCn_CFG011[UMEM_LIMIT],PCIERCn_CFG009[LMEM_LIMIT] <
 532         * PCIERCn_CFG010[UMEM_BASE],PCIERCn_CFG009[LMEM_BASE]
 533         */
 534        pciercx_cfg009.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG009(pcie_port));
 535        pciercx_cfg010.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG010(pcie_port));
 536        pciercx_cfg011.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG011(pcie_port));
 537        pciercx_cfg009.s.lmem_base = 0x100;
 538        pciercx_cfg009.s.lmem_limit = 0;
 539        pciercx_cfg010.s.umem_base = 0x100;
 540        pciercx_cfg011.s.umem_limit = 0;
 541        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG009(pcie_port), pciercx_cfg009.u32);
 542        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG010(pcie_port), pciercx_cfg010.u32);
 543        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG011(pcie_port), pciercx_cfg011.u32);
 544
 545        /*
 546         * System Error Interrupt Enables (PCIERCn_CFG035[SECEE,SEFEE,SENFEE])
 547         * PME Interrupt Enables (PCIERCn_CFG035[PMEIE])
 548        */
 549        pciercx_cfg035.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG035(pcie_port));
 550        pciercx_cfg035.s.secee = 1; /* System error on correctable error enable. */
 551        pciercx_cfg035.s.sefee = 1; /* System error on fatal error enable. */
 552        pciercx_cfg035.s.senfee = 1; /* System error on non-fatal error enable. */
 553        pciercx_cfg035.s.pmeie = 1; /* PME interrupt enable. */
 554        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG035(pcie_port), pciercx_cfg035.u32);
 555
 556        /*
 557         * Advanced Error Recovery Interrupt Enables
 558         * (PCIERCn_CFG075[CERE,NFERE,FERE])
 559         */
 560        pciercx_cfg075.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG075(pcie_port));
 561        pciercx_cfg075.s.cere = 1; /* Correctable error reporting enable. */
 562        pciercx_cfg075.s.nfere = 1; /* Non-fatal error reporting enable. */
 563        pciercx_cfg075.s.fere = 1; /* Fatal error reporting enable. */
 564        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG075(pcie_port), pciercx_cfg075.u32);
 565
 566        /*
 567         * HP Interrupt Enables (PCIERCn_CFG034[HPINT_EN],
 568         * PCIERCn_CFG034[DLLS_EN,CCINT_EN])
 569         */
 570        pciercx_cfg034.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG034(pcie_port));
 571        pciercx_cfg034.s.hpint_en = 1; /* Hot-plug interrupt enable. */
 572        pciercx_cfg034.s.dlls_en = 1; /* Data Link Layer state changed enable */
 573        pciercx_cfg034.s.ccint_en = 1; /* Command completed interrupt enable. */
 574        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG034(pcie_port), pciercx_cfg034.u32);
 575}
 576
 577/**
 578 * Initialize a host mode PCIe gen 1 link. This function takes a PCIe
 579 * port from reset to a link up state. Software can then begin
 580 * configuring the rest of the link.
 581 *
 582 * @pcie_port: PCIe port to initialize
 583 *
 584 * Returns Zero on success
 585 */
 586static int __cvmx_pcie_rc_initialize_link_gen1(int pcie_port)
 587{
 588        uint64_t start_cycle;
 589        union cvmx_pescx_ctl_status pescx_ctl_status;
 590        union cvmx_pciercx_cfg452 pciercx_cfg452;
 591        union cvmx_pciercx_cfg032 pciercx_cfg032;
 592        union cvmx_pciercx_cfg448 pciercx_cfg448;
 593
 594        /* Set the lane width */
 595        pciercx_cfg452.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG452(pcie_port));
 596        pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
 597        if (pescx_ctl_status.s.qlm_cfg == 0)
 598                /* We're in 8 lane (56XX) or 4 lane (54XX) mode */
 599                pciercx_cfg452.s.lme = 0xf;
 600        else
 601                /* We're in 4 lane (56XX) or 2 lane (52XX) mode */
 602                pciercx_cfg452.s.lme = 0x7;
 603        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG452(pcie_port), pciercx_cfg452.u32);
 604
 605        /*
 606         * CN52XX pass 1.x has an errata where length mismatches on UR
 607         * responses can cause bus errors on 64bit memory
 608         * reads. Turning off length error checking fixes this.
 609         */
 610        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
 611                union cvmx_pciercx_cfg455 pciercx_cfg455;
 612                pciercx_cfg455.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG455(pcie_port));
 613                pciercx_cfg455.s.m_cpl_len_err = 1;
 614                cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG455(pcie_port), pciercx_cfg455.u32);
 615        }
 616
 617        /* Lane swap needs to be manually enabled for CN52XX */
 618        if (OCTEON_IS_MODEL(OCTEON_CN52XX) && (pcie_port == 1)) {
 619                pescx_ctl_status.s.lane_swp = 1;
 620                cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
 621        }
 622
 623        /* Bring up the link */
 624        pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
 625        pescx_ctl_status.s.lnk_enb = 1;
 626        cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
 627
 628        /*
 629         * CN52XX pass 1.0: Due to a bug in 2nd order CDR, it needs to
 630         * be disabled.
 631         */
 632        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_0))
 633                __cvmx_helper_errata_qlm_disable_2nd_order_cdr(0);
 634
 635        /* Wait for the link to come up */
 636        start_cycle = cvmx_get_cycle();
 637        do {
 638                if (cvmx_get_cycle() - start_cycle > 2 * octeon_get_clock_rate()) {
 639                        cvmx_dprintf("PCIe: Port %d link timeout\n", pcie_port);
 640                        return -1;
 641                }
 642                cvmx_wait(10000);
 643                pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
 644        } while (pciercx_cfg032.s.dlla == 0);
 645
 646        /* Clear all pending errors */
 647        cvmx_write_csr(CVMX_PEXP_NPEI_INT_SUM, cvmx_read_csr(CVMX_PEXP_NPEI_INT_SUM));
 648
 649        /*
 650         * Update the Replay Time Limit. Empirically, some PCIe
 651         * devices take a little longer to respond than expected under
 652         * load. As a workaround for this we configure the Replay Time
 653         * Limit to the value expected for a 512 byte MPS instead of
 654         * our actual 256 byte MPS. The numbers below are directly
 655         * from the PCIe spec table 3-4.
 656         */
 657        pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
 658        switch (pciercx_cfg032.s.nlw) {
 659        case 1:         /* 1 lane */
 660                pciercx_cfg448.s.rtl = 1677;
 661                break;
 662        case 2:         /* 2 lanes */
 663                pciercx_cfg448.s.rtl = 867;
 664                break;
 665        case 4:         /* 4 lanes */
 666                pciercx_cfg448.s.rtl = 462;
 667                break;
 668        case 8:         /* 8 lanes */
 669                pciercx_cfg448.s.rtl = 258;
 670                break;
 671        }
 672        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);
 673
 674        return 0;
 675}
 676
 677static void __cvmx_increment_ba(union cvmx_sli_mem_access_subidx *pmas)
 678{
 679        if (OCTEON_IS_MODEL(OCTEON_CN68XX))
 680                pmas->cn68xx.ba++;
 681        else
 682                pmas->cn63xx.ba++;
 683}
 684
 685/**
 686 * Initialize a PCIe gen 1 port for use in host(RC) mode. It doesn't
 687 * enumerate the bus.
 688 *
 689 * @pcie_port: PCIe port to initialize
 690 *
 691 * Returns Zero on success
 692 */
 693static int __cvmx_pcie_rc_initialize_gen1(int pcie_port)
 694{
 695        int i;
 696        int base;
 697        u64 addr_swizzle;
 698        union cvmx_ciu_soft_prst ciu_soft_prst;
 699        union cvmx_pescx_bist_status pescx_bist_status;
 700        union cvmx_pescx_bist_status2 pescx_bist_status2;
 701        union cvmx_npei_ctl_status npei_ctl_status;
 702        union cvmx_npei_mem_access_ctl npei_mem_access_ctl;
 703        union cvmx_npei_mem_access_subidx mem_access_subid;
 704        union cvmx_npei_dbg_data npei_dbg_data;
 705        union cvmx_pescx_ctl_status2 pescx_ctl_status2;
 706        union cvmx_pciercx_cfg032 pciercx_cfg032;
 707        union cvmx_npei_bar1_indexx bar1_index;
 708
 709retry:
 710        /*
 711         * Make sure we aren't trying to setup a target mode interface
 712         * in host mode.
 713         */
 714        npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
 715        if ((pcie_port == 0) && !npei_ctl_status.s.host_mode) {
 716                cvmx_dprintf("PCIe: Port %d in endpoint mode\n", pcie_port);
 717                return -1;
 718        }
 719
 720        /*
 721         * Make sure a CN52XX isn't trying to bring up port 1 when it
 722         * is disabled.
 723         */
 724        if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
 725                npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
 726                if ((pcie_port == 1) && npei_dbg_data.cn52xx.qlm0_link_width) {
 727                        cvmx_dprintf("PCIe: ERROR: cvmx_pcie_rc_initialize() called on port1, but port1 is disabled\n");
 728                        return -1;
 729                }
 730        }
 731
 732        /*
 733         * PCIe switch arbitration mode. '0' == fixed priority NPEI,
 734         * PCIe0, then PCIe1. '1' == round robin.
 735         */
 736        npei_ctl_status.s.arb = 1;
 737        /* Allow up to 0x20 config retries */
 738        npei_ctl_status.s.cfg_rtry = 0x20;
 739        /*
 740         * CN52XX pass1.x has an errata where P0_NTAGS and P1_NTAGS
 741         * don't reset.
 742         */
 743        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
 744                npei_ctl_status.s.p0_ntags = 0x20;
 745                npei_ctl_status.s.p1_ntags = 0x20;
 746        }
 747        cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS, npei_ctl_status.u64);
 748
 749        /* Bring the PCIe out of reset */
 750        if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) {
 751                /*
 752                 * The EBH5200 board swapped the PCIe reset lines on
 753                 * the board. As a workaround for this bug, we bring
 754                 * both PCIe ports out of reset at the same time
 755                 * instead of on separate calls. So for port 0, we
 756                 * bring both out of reset and do nothing on port 1
 757                 */
 758                if (pcie_port == 0) {
 759                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
 760                        /*
 761                         * After a chip reset the PCIe will also be in
 762                         * reset. If it isn't, most likely someone is
 763                         * trying to init it again without a proper
 764                         * PCIe reset.
 765                         */
 766                        if (ciu_soft_prst.s.soft_prst == 0) {
 767                                /* Reset the ports */
 768                                ciu_soft_prst.s.soft_prst = 1;
 769                                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
 770                                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
 771                                ciu_soft_prst.s.soft_prst = 1;
 772                                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
 773                                /* Wait until pcie resets the ports. */
 774                                udelay(2000);
 775                        }
 776                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
 777                        ciu_soft_prst.s.soft_prst = 0;
 778                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
 779                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
 780                        ciu_soft_prst.s.soft_prst = 0;
 781                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
 782                }
 783        } else {
 784                /*
 785                 * The normal case: The PCIe ports are completely
 786                 * separate and can be brought out of reset
 787                 * independently.
 788                 */
 789                if (pcie_port)
 790                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
 791                else
 792                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
 793                /*
 794                 * After a chip reset the PCIe will also be in
 795                 * reset. If it isn't, most likely someone is trying
 796                 * to init it again without a proper PCIe reset.
 797                 */
 798                if (ciu_soft_prst.s.soft_prst == 0) {
 799                        /* Reset the port */
 800                        ciu_soft_prst.s.soft_prst = 1;
 801                        if (pcie_port)
 802                                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
 803                        else
 804                                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
 805                        /* Wait until pcie resets the ports. */
 806                        udelay(2000);
 807                }
 808                if (pcie_port) {
 809                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
 810                        ciu_soft_prst.s.soft_prst = 0;
 811                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
 812                } else {
 813                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
 814                        ciu_soft_prst.s.soft_prst = 0;
 815                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
 816                }
 817        }
 818
 819        /*
 820         * Wait for PCIe reset to complete. Due to errata PCIE-700, we
 821         * don't poll PESCX_CTL_STATUS2[PCIERST], but simply wait a
 822         * fixed number of cycles.
 823         */
 824        cvmx_wait(400000);
 825
 826        /*
 827         * PESCX_BIST_STATUS2[PCLK_RUN] was missing on pass 1 of
 828         * CN56XX and CN52XX, so we only probe it on newer chips
 829         */
 830        if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
 831                /* Clear PCLK_RUN so we can check if the clock is running */
 832                pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
 833                pescx_ctl_status2.s.pclk_run = 1;
 834                cvmx_write_csr(CVMX_PESCX_CTL_STATUS2(pcie_port), pescx_ctl_status2.u64);
 835                /* Now that we cleared PCLK_RUN, wait for it to be set
 836                 * again telling us the clock is running
 837                 */
 838                if (CVMX_WAIT_FOR_FIELD64(CVMX_PESCX_CTL_STATUS2(pcie_port),
 839                                          union cvmx_pescx_ctl_status2, pclk_run, ==, 1, 10000)) {
 840                        cvmx_dprintf("PCIe: Port %d isn't clocked, skipping.\n", pcie_port);
 841                        return -1;
 842                }
 843        }
 844
 845        /*
 846         * Check and make sure PCIe came out of reset. If it doesn't
 847         * the board probably hasn't wired the clocks up and the
 848         * interface should be skipped.
 849         */
 850        pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
 851        if (pescx_ctl_status2.s.pcierst) {
 852                cvmx_dprintf("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
 853                return -1;
 854        }
 855
 856        /*
 857         * Check BIST2 status. If any bits are set skip this
 858         * interface. This is an attempt to catch PCIE-813 on pass 1
 859         * parts.
 860         */
 861        pescx_bist_status2.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS2(pcie_port));
 862        if (pescx_bist_status2.u64) {
 863                cvmx_dprintf("PCIe: Port %d BIST2 failed. Most likely this port isn't hooked up, skipping.\n",
 864                             pcie_port);
 865                return -1;
 866        }
 867
 868        /* Check BIST status */
 869        pescx_bist_status.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS(pcie_port));
 870        if (pescx_bist_status.u64)
 871                cvmx_dprintf("PCIe: BIST FAILED for port %d (0x%016llx)\n",
 872                             pcie_port, CAST64(pescx_bist_status.u64));
 873
 874        /* Initialize the config space CSRs */
 875        __cvmx_pcie_rc_initialize_config_space(pcie_port);
 876
 877        /* Bring the link up */
 878        if (__cvmx_pcie_rc_initialize_link_gen1(pcie_port)) {
 879                cvmx_dprintf("PCIe: Failed to initialize port %d, probably the slot is empty\n",
 880                             pcie_port);
 881                return -1;
 882        }
 883
 884        /* Store merge control (NPEI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
 885        npei_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL);
 886        npei_mem_access_ctl.s.max_word = 0;     /* Allow 16 words to combine */
 887        npei_mem_access_ctl.s.timer = 127;      /* Wait up to 127 cycles for more data */
 888        cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL, npei_mem_access_ctl.u64);
 889
 890        /* Setup Mem access SubDIDs */
 891        mem_access_subid.u64 = 0;
 892        mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
 893        mem_access_subid.s.nmerge = 1;  /* Due to an errata on pass 1 chips, no merging is allowed. */
 894        mem_access_subid.s.esr = 1;     /* Endian-swap for Reads. */
 895        mem_access_subid.s.esw = 1;     /* Endian-swap for Writes. */
 896        mem_access_subid.s.nsr = 0;     /* Enable Snooping for Reads. Octeon doesn't care, but devices might want this more conservative setting */
 897        mem_access_subid.s.nsw = 0;     /* Enable Snoop for Writes. */
 898        mem_access_subid.s.ror = 0;     /* Disable Relaxed Ordering for Reads. */
 899        mem_access_subid.s.row = 0;     /* Disable Relaxed Ordering for Writes. */
 900        mem_access_subid.s.ba = 0;      /* PCIe Adddress Bits <63:34>. */
 901
 902        /*
 903         * Setup mem access 12-15 for port 0, 16-19 for port 1,
 904         * supplying 36 bits of address space.
 905         */
 906        for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
 907                cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
 908                mem_access_subid.s.ba += 1; /* Set each SUBID to extend the addressable range */
 909        }
 910
 911        /*
 912         * Disable the peer to peer forwarding register. This must be
 913         * setup by the OS after it enumerates the bus and assigns
 914         * addresses to the PCIe busses.
 915         */
 916        for (i = 0; i < 4; i++) {
 917                cvmx_write_csr(CVMX_PESCX_P2P_BARX_START(i, pcie_port), -1);
 918                cvmx_write_csr(CVMX_PESCX_P2P_BARX_END(i, pcie_port), -1);
 919        }
 920
 921        /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
 922        cvmx_write_csr(CVMX_PESCX_P2N_BAR0_START(pcie_port), 0);
 923
 924        /* BAR1 follows BAR2 with a gap so it has the same address as for gen2. */
 925        cvmx_write_csr(CVMX_PESCX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
 926
 927        bar1_index.u32 = 0;
 928        bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
 929        bar1_index.s.ca = 1;       /* Not Cached */
 930        bar1_index.s.end_swp = 1;  /* Endian Swap mode */
 931        bar1_index.s.addr_v = 1;   /* Valid entry */
 932
 933        base = pcie_port ? 16 : 0;
 934
 935        /* Big endian swizzle for 32-bit PEXP_NCB register. */
 936#ifdef __MIPSEB__
 937        addr_swizzle = 4;
 938#else
 939        addr_swizzle = 0;
 940#endif
 941        for (i = 0; i < 16; i++) {
 942                cvmx_write64_uint32((CVMX_PEXP_NPEI_BAR1_INDEXX(base) ^ addr_swizzle),
 943                                    bar1_index.u32);
 944                base++;
 945                /* 256MB / 16 >> 22 == 4 */
 946                bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
 947        }
 948
 949        /*
 950         * Set Octeon's BAR2 to decode 0-2^39. Bar0 and Bar1 take
 951         * precedence where they overlap. It also overlaps with the
 952         * device addresses, so make sure the peer to peer forwarding
 953         * is set right.
 954         */
 955        cvmx_write_csr(CVMX_PESCX_P2N_BAR2_START(pcie_port), 0);
 956
 957        /*
 958         * Setup BAR2 attributes
 959         *
 960         * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
 961         * - PTLP_RO,CTLP_RO should normally be set (except for debug).
 962         * - WAIT_COM=0 will likely work for all applications.
 963         *
 964         * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM]).
 965         */
 966        if (pcie_port) {
 967                union cvmx_npei_ctl_port1 npei_ctl_port;
 968                npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT1);
 969                npei_ctl_port.s.bar2_enb = 1;
 970                npei_ctl_port.s.bar2_esx = 1;
 971                npei_ctl_port.s.bar2_cax = 0;
 972                npei_ctl_port.s.ptlp_ro = 1;
 973                npei_ctl_port.s.ctlp_ro = 1;
 974                npei_ctl_port.s.wait_com = 0;
 975                npei_ctl_port.s.waitl_com = 0;
 976                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT1, npei_ctl_port.u64);
 977        } else {
 978                union cvmx_npei_ctl_port0 npei_ctl_port;
 979                npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT0);
 980                npei_ctl_port.s.bar2_enb = 1;
 981                npei_ctl_port.s.bar2_esx = 1;
 982                npei_ctl_port.s.bar2_cax = 0;
 983                npei_ctl_port.s.ptlp_ro = 1;
 984                npei_ctl_port.s.ctlp_ro = 1;
 985                npei_ctl_port.s.wait_com = 0;
 986                npei_ctl_port.s.waitl_com = 0;
 987                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT0, npei_ctl_port.u64);
 988        }
 989
 990        /*
 991         * Both pass 1 and pass 2 of CN52XX and CN56XX have an errata
 992         * that causes TLP ordering to not be preserved after multiple
 993         * PCIe port resets. This code detects this fault and corrects
 994         * it by aligning the TLP counters properly. Another link
 995         * reset is then performed. See PCIE-13340
 996         */
 997        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) ||
 998            OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X) ||
 999            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) ||
1000            OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
1001                union cvmx_npei_dbg_data dbg_data;
1002                int old_in_fif_p_count;
1003                int in_fif_p_count;
1004                int out_p_count;
1005                int in_p_offset = (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X) || OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) ? 4 : 1;
1006                int i;
1007
1008                /*
1009                 * Choose a write address of 1MB. It should be
1010                 * harmless as all bars haven't been setup.
1011                 */
1012                uint64_t write_address = (cvmx_pcie_get_mem_base_address(pcie_port) + 0x100000) | (1ull<<63);
1013
1014                /*
1015                 * Make sure at least in_p_offset have been executed before we try and
1016                 * read in_fif_p_count
1017                 */
1018                i = in_p_offset;
1019                while (i--) {
1020                        cvmx_write64_uint32(write_address, 0);
1021                        cvmx_wait(10000);
1022                }
1023
1024                /*
1025                 * Read the IN_FIF_P_COUNT from the debug
1026                 * select. IN_FIF_P_COUNT can be unstable sometimes so
1027                 * read it twice with a write between the reads.  This
1028                 * way we can tell the value is good as it will
1029                 * increment by one due to the write
1030                 */
1031                cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd7fc : 0xcffc);
1032                cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
1033                do {
1034                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1035                        old_in_fif_p_count = dbg_data.s.data & 0xff;
1036                        cvmx_write64_uint32(write_address, 0);
1037                        cvmx_wait(10000);
1038                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1039                        in_fif_p_count = dbg_data.s.data & 0xff;
1040                } while (in_fif_p_count != ((old_in_fif_p_count+1) & 0xff));
1041
1042                /* Update in_fif_p_count for it's offset with respect to out_p_count */
1043                in_fif_p_count = (in_fif_p_count + in_p_offset) & 0xff;
1044
1045                /* Read the OUT_P_COUNT from the debug select */
1046                cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd00f : 0xc80f);
1047                cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
1048                dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1049                out_p_count = (dbg_data.s.data>>1) & 0xff;
1050
1051                /* Check that the two counters are aligned */
1052                if (out_p_count != in_fif_p_count) {
1053                        cvmx_dprintf("PCIe: Port %d aligning TLP counters as workaround to maintain ordering\n", pcie_port);
1054                        while (in_fif_p_count != 0) {
1055                                cvmx_write64_uint32(write_address, 0);
1056                                cvmx_wait(10000);
1057                                in_fif_p_count = (in_fif_p_count + 1) & 0xff;
1058                        }
1059                        /*
1060                         * The EBH5200 board swapped the PCIe reset
1061                         * lines on the board. This means we must
1062                         * bring both links down and up, which will
1063                         * cause the PCIe0 to need alignment
1064                         * again. Lots of messages will be displayed,
1065                         * but everything should work
1066                         */
1067                        if ((cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) &&
1068                                (pcie_port == 1))
1069                                cvmx_pcie_rc_initialize(0);
1070                        /* Rety bringing this port up */
1071                        goto retry;
1072                }
1073        }
1074
1075        /* Display the link status */
1076        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1077        cvmx_dprintf("PCIe: Port %d link active, %d lanes\n", pcie_port, pciercx_cfg032.s.nlw);
1078
1079        return 0;
1080}
1081
1082/**
1083  * Initialize a host mode PCIe gen 2 link. This function takes a PCIe
1084 * port from reset to a link up state. Software can then begin
1085 * configuring the rest of the link.
1086 *
1087 * @pcie_port: PCIe port to initialize
1088 *
1089 * Return Zero on success.
1090 */
1091static int __cvmx_pcie_rc_initialize_link_gen2(int pcie_port)
1092{
1093        uint64_t start_cycle;
1094        union cvmx_pemx_ctl_status pem_ctl_status;
1095        union cvmx_pciercx_cfg032 pciercx_cfg032;
1096        union cvmx_pciercx_cfg448 pciercx_cfg448;
1097
1098        /* Bring up the link */
1099        pem_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
1100        pem_ctl_status.s.lnk_enb = 1;
1101        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64);
1102
1103        /* Wait for the link to come up */
1104        start_cycle = cvmx_get_cycle();
1105        do {
1106                if (cvmx_get_cycle() - start_cycle >  octeon_get_clock_rate())
1107                        return -1;
1108                cvmx_wait(10000);
1109                pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1110        } while ((pciercx_cfg032.s.dlla == 0) || (pciercx_cfg032.s.lt == 1));
1111
1112        /*
1113         * Update the Replay Time Limit. Empirically, some PCIe
1114         * devices take a little longer to respond than expected under
1115         * load. As a workaround for this we configure the Replay Time
1116         * Limit to the value expected for a 512 byte MPS instead of
1117         * our actual 256 byte MPS. The numbers below are directly
1118         * from the PCIe spec table 3-4
1119         */
1120        pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
1121        switch (pciercx_cfg032.s.nlw) {
1122        case 1: /* 1 lane */
1123                pciercx_cfg448.s.rtl = 1677;
1124                break;
1125        case 2: /* 2 lanes */
1126                pciercx_cfg448.s.rtl = 867;
1127                break;
1128        case 4: /* 4 lanes */
1129                pciercx_cfg448.s.rtl = 462;
1130                break;
1131        case 8: /* 8 lanes */
1132                pciercx_cfg448.s.rtl = 258;
1133                break;
1134        }
1135        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);
1136
1137        return 0;
1138}
1139
1140
1141/**
1142 * Initialize a PCIe gen 2 port for use in host(RC) mode. It doesn't enumerate
1143 * the bus.
1144 *
1145 * @pcie_port: PCIe port to initialize
1146 *
1147 * Returns Zero on success.
1148 */
1149static int __cvmx_pcie_rc_initialize_gen2(int pcie_port)
1150{
1151        int i;
1152        union cvmx_ciu_soft_prst ciu_soft_prst;
1153        union cvmx_mio_rst_ctlx mio_rst_ctl;
1154        union cvmx_pemx_bar_ctl pemx_bar_ctl;
1155        union cvmx_pemx_ctl_status pemx_ctl_status;
1156        union cvmx_pemx_bist_status pemx_bist_status;
1157        union cvmx_pemx_bist_status2 pemx_bist_status2;
1158        union cvmx_pciercx_cfg032 pciercx_cfg032;
1159        union cvmx_pciercx_cfg515 pciercx_cfg515;
1160        union cvmx_sli_ctl_portx sli_ctl_portx;
1161        union cvmx_sli_mem_access_ctl sli_mem_access_ctl;
1162        union cvmx_sli_mem_access_subidx mem_access_subid;
1163        union cvmx_sriox_status_reg sriox_status_reg;
1164        union cvmx_pemx_bar1_indexx bar1_index;
1165
1166        if (octeon_has_feature(OCTEON_FEATURE_SRIO)) {
1167                /* Make sure this interface isn't SRIO */
1168                if (OCTEON_IS_MODEL(OCTEON_CN66XX)) {
1169                        /*
1170                         * The CN66XX requires reading the
1171                         * MIO_QLMX_CFG register to figure out the
1172                         * port type.
1173                         */
1174                        union cvmx_mio_qlmx_cfg qlmx_cfg;
1175                        qlmx_cfg.u64 = cvmx_read_csr(CVMX_MIO_QLMX_CFG(pcie_port));
1176
1177                        if (qlmx_cfg.s.qlm_spd == 15) {
1178                                pr_notice("PCIe: Port %d is disabled, skipping.\n", pcie_port);
1179                                return -1;
1180                        }
1181
1182                        switch (qlmx_cfg.s.qlm_spd) {
1183                        case 0x1: /* SRIO 1x4 short */
1184                        case 0x3: /* SRIO 1x4 long */
1185                        case 0x4: /* SRIO 2x2 short */
1186                        case 0x6: /* SRIO 2x2 long */
1187                                pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
1188                                return -1;
1189                        case 0x9: /* SGMII */
1190                                pr_notice("PCIe: Port %d is SGMII, skipping.\n", pcie_port);
1191                                return -1;
1192                        case 0xb: /* XAUI */
1193                                pr_notice("PCIe: Port %d is XAUI, skipping.\n", pcie_port);
1194                                return -1;
1195                        case 0x0: /* PCIE gen2 */
1196                        case 0x8: /* PCIE gen2 (alias) */
1197                        case 0x2: /* PCIE gen1 */
1198                        case 0xa: /* PCIE gen1 (alias) */
1199                                break;
1200                        default:
1201                                pr_notice("PCIe: Port %d is unknown, skipping.\n", pcie_port);
1202                                return -1;
1203                        }
1204                } else {
1205                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(pcie_port));
1206                        if (sriox_status_reg.s.srio) {
1207                                pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
1208                                return -1;
1209                        }
1210                }
1211        }
1212
1213#if 0
1214    /* This code is so that the PCIe analyzer is able to see 63XX traffic */
1215        pr_notice("PCIE : init for pcie analyzer.\n");
1216        cvmx_helper_qlm_jtag_init();
1217        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1218        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1219        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1220        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1221        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1222        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1223        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1224        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1225        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1226        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
1227        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
1228        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
1229        cvmx_helper_qlm_jtag_update(pcie_port);
1230#endif
1231
1232        /* Make sure we aren't trying to setup a target mode interface in host mode */
1233        mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(pcie_port));
1234        if (!mio_rst_ctl.s.host_mode) {
1235                pr_notice("PCIe: Port %d in endpoint mode.\n", pcie_port);
1236                return -1;
1237        }
1238
1239        /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be programmed */
1240        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) {
1241                if (pcie_port) {
1242                        union cvmx_ciu_qlm1 ciu_qlm;
1243                        ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM1);
1244                        ciu_qlm.s.txbypass = 1;
1245                        ciu_qlm.s.txdeemph = 5;
1246                        ciu_qlm.s.txmargin = 0x17;
1247                        cvmx_write_csr(CVMX_CIU_QLM1, ciu_qlm.u64);
1248                } else {
1249                        union cvmx_ciu_qlm0 ciu_qlm;
1250                        ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM0);
1251                        ciu_qlm.s.txbypass = 1;
1252                        ciu_qlm.s.txdeemph = 5;
1253                        ciu_qlm.s.txmargin = 0x17;
1254                        cvmx_write_csr(CVMX_CIU_QLM0, ciu_qlm.u64);
1255                }
1256        }
1257        /* Bring the PCIe out of reset */
1258        if (pcie_port)
1259                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
1260        else
1261                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
1262        /*
1263         * After a chip reset the PCIe will also be in reset. If it
1264         * isn't, most likely someone is trying to init it again
1265         * without a proper PCIe reset
1266         */
1267        if (ciu_soft_prst.s.soft_prst == 0) {
1268                /* Reset the port */
1269                ciu_soft_prst.s.soft_prst = 1;
1270                if (pcie_port)
1271                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
1272                else
1273                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
1274                /* Wait until pcie resets the ports. */
1275                udelay(2000);
1276        }
1277        if (pcie_port) {
1278                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
1279                ciu_soft_prst.s.soft_prst = 0;
1280                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
1281        } else {
1282                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
1283                ciu_soft_prst.s.soft_prst = 0;
1284                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
1285        }
1286
1287        /* Wait for PCIe reset to complete */
1288        udelay(1000);
1289
1290        /*
1291         * Check and make sure PCIe came out of reset. If it doesn't
1292         * the board probably hasn't wired the clocks up and the
1293         * interface should be skipped.
1294         */
1295        if (CVMX_WAIT_FOR_FIELD64(CVMX_MIO_RST_CTLX(pcie_port), union cvmx_mio_rst_ctlx, rst_done, ==, 1, 10000)) {
1296                pr_notice("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
1297                return -1;
1298        }
1299
1300        /* Check BIST status */
1301        pemx_bist_status.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS(pcie_port));
1302        if (pemx_bist_status.u64)
1303                pr_notice("PCIe: BIST FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status.u64));
1304        pemx_bist_status2.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS2(pcie_port));
1305        /* Errata PCIE-14766 may cause the lower 6 bits to be randomly set on CN63XXp1 */
1306        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X))
1307                pemx_bist_status2.u64 &= ~0x3full;
1308        if (pemx_bist_status2.u64)
1309                pr_notice("PCIe: BIST2 FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status2.u64));
1310
1311        /* Initialize the config space CSRs */
1312        __cvmx_pcie_rc_initialize_config_space(pcie_port);
1313
1314        /* Enable gen2 speed selection */
1315        pciercx_cfg515.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG515(pcie_port));
1316        pciercx_cfg515.s.dsc = 1;
1317        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32);
1318
1319        /* Bring the link up */
1320        if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
1321                /*
1322                 * Some gen1 devices don't handle the gen 2 training
1323                 * correctly. Disable gen2 and try again with only
1324                 * gen1
1325                 */
1326                union cvmx_pciercx_cfg031 pciercx_cfg031;
1327                pciercx_cfg031.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG031(pcie_port));
1328                pciercx_cfg031.s.mls = 1;
1329                cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), pciercx_cfg031.u32);
1330                if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
1331                        pr_notice("PCIe: Link timeout on port %d, probably the slot is empty\n", pcie_port);
1332                        return -1;
1333                }
1334        }
1335
1336        /* Store merge control (SLI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
1337        sli_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL);
1338        sli_mem_access_ctl.s.max_word = 0;      /* Allow 16 words to combine */
1339        sli_mem_access_ctl.s.timer = 127;       /* Wait up to 127 cycles for more data */
1340        cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL, sli_mem_access_ctl.u64);
1341
1342        /* Setup Mem access SubDIDs */
1343        mem_access_subid.u64 = 0;
1344        mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
1345        mem_access_subid.s.nmerge = 0;  /* Allow merging as it works on CN6XXX. */
1346        mem_access_subid.s.esr = 1;     /* Endian-swap for Reads. */
1347        mem_access_subid.s.esw = 1;     /* Endian-swap for Writes. */
1348        mem_access_subid.s.wtype = 0;   /* "No snoop" and "Relaxed ordering" are not set */
1349        mem_access_subid.s.rtype = 0;   /* "No snoop" and "Relaxed ordering" are not set */
1350        /* PCIe Adddress Bits <63:34>. */
1351        if (OCTEON_IS_MODEL(OCTEON_CN68XX))
1352                mem_access_subid.cn68xx.ba = 0;
1353        else
1354                mem_access_subid.cn63xx.ba = 0;
1355
1356        /*
1357         * Setup mem access 12-15 for port 0, 16-19 for port 1,
1358         * supplying 36 bits of address space.
1359         */
1360        for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
1361                cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
1362                /* Set each SUBID to extend the addressable range */
1363                __cvmx_increment_ba(&mem_access_subid);
1364        }
1365
1366        /*
1367         * Disable the peer to peer forwarding register. This must be
1368         * setup by the OS after it enumerates the bus and assigns
1369         * addresses to the PCIe busses.
1370         */
1371        for (i = 0; i < 4; i++) {
1372                cvmx_write_csr(CVMX_PEMX_P2P_BARX_START(i, pcie_port), -1);
1373                cvmx_write_csr(CVMX_PEMX_P2P_BARX_END(i, pcie_port), -1);
1374        }
1375
1376        /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
1377        cvmx_write_csr(CVMX_PEMX_P2N_BAR0_START(pcie_port), 0);
1378
1379        /*
1380         * Set Octeon's BAR2 to decode 0-2^41. Bar0 and Bar1 take
1381         * precedence where they overlap. It also overlaps with the
1382         * device addresses, so make sure the peer to peer forwarding
1383         * is set right.
1384         */
1385        cvmx_write_csr(CVMX_PEMX_P2N_BAR2_START(pcie_port), 0);
1386
1387        /*
1388         * Setup BAR2 attributes
1389         * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
1390         * - PTLP_RO,CTLP_RO should normally be set (except for debug).
1391         * - WAIT_COM=0 will likely work for all applications.
1392         * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM])
1393         */
1394        pemx_bar_ctl.u64 = cvmx_read_csr(CVMX_PEMX_BAR_CTL(pcie_port));
1395        pemx_bar_ctl.s.bar1_siz = 3;  /* 256MB BAR1*/
1396        pemx_bar_ctl.s.bar2_enb = 1;
1397        pemx_bar_ctl.s.bar2_esx = 1;
1398        pemx_bar_ctl.s.bar2_cax = 0;
1399        cvmx_write_csr(CVMX_PEMX_BAR_CTL(pcie_port), pemx_bar_ctl.u64);
1400        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port));
1401        sli_ctl_portx.s.ptlp_ro = 1;
1402        sli_ctl_portx.s.ctlp_ro = 1;
1403        sli_ctl_portx.s.wait_com = 0;
1404        sli_ctl_portx.s.waitl_com = 0;
1405        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port), sli_ctl_portx.u64);
1406
1407        /* BAR1 follows BAR2 */
1408        cvmx_write_csr(CVMX_PEMX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);
1409
1410        bar1_index.u64 = 0;
1411        bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
1412        bar1_index.s.ca = 1;       /* Not Cached */
1413        bar1_index.s.end_swp = 1;  /* Endian Swap mode */
1414        bar1_index.s.addr_v = 1;   /* Valid entry */
1415
1416        for (i = 0; i < 16; i++) {
1417                cvmx_write_csr(CVMX_PEMX_BAR1_INDEXX(i, pcie_port), bar1_index.u64);
1418                /* 256MB / 16 >> 22 == 4 */
1419                bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
1420        }
1421
1422        /*
1423         * Allow config retries for 250ms. Count is based off the 5Ghz
1424         * SERDES clock.
1425         */
1426        pemx_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
1427        pemx_ctl_status.s.cfg_rtry = 250 * 5000000 / 0x10000;
1428        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pemx_ctl_status.u64);
1429
1430        /* Display the link status */
1431        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
1432        pr_notice("PCIe: Port %d link active, %d lanes, speed gen%d\n", pcie_port, pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls);
1433
1434        return 0;
1435}
1436
1437/**
1438 * Initialize a PCIe port for use in host(RC) mode. It doesn't enumerate the bus.
1439 *
1440 * @pcie_port: PCIe port to initialize
1441 *
1442 * Returns Zero on success
1443 */
1444static int cvmx_pcie_rc_initialize(int pcie_port)
1445{
1446        int result;
1447        if (octeon_has_feature(OCTEON_FEATURE_NPEI))
1448                result = __cvmx_pcie_rc_initialize_gen1(pcie_port);
1449        else
1450                result = __cvmx_pcie_rc_initialize_gen2(pcie_port);
1451        return result;
1452}
1453
1454/* Above was cvmx-pcie.c, below original pcie.c */
1455
1456/**
1457 * Map a PCI device to the appropriate interrupt line
1458 *
1459 * @dev:    The Linux PCI device structure for the device to map
1460 * @slot:   The slot number for this device on __BUS 0__. Linux
1461 *               enumerates through all the bridges and figures out the
1462 *               slot on Bus 0 where this device eventually hooks to.
1463 * @pin:    The PCI interrupt pin read from the device, then swizzled
1464 *               as it goes through each bridge.
1465 * Returns Interrupt number for the device
1466 */
1467int __init octeon_pcie_pcibios_map_irq(const struct pci_dev *dev,
1468                                       u8 slot, u8 pin)
1469{
1470        /*
1471         * The EBH5600 board with the PCI to PCIe bridge mistakenly
1472         * wires the first slot for both device id 2 and interrupt
1473         * A. According to the PCI spec, device id 2 should be C. The
1474         * following kludge attempts to fix this.
1475         */
1476        if (strstr(octeon_board_type_string(), "EBH5600") &&
1477            dev->bus && dev->bus->parent) {
1478                /*
1479                 * Iterate all the way up the device chain and find
1480                 * the root bus.
1481                 */
1482                while (dev->bus && dev->bus->parent)
1483                        dev = to_pci_dev(dev->bus->bridge);
1484                /*
1485                 * If the root bus is number 0 and the PEX 8114 is the
1486                 * root, assume we are behind the miswired bus. We
1487                 * need to correct the swizzle level by two. Yuck.
1488                 */
1489                if ((dev->bus->number == 1) &&
1490                    (dev->vendor == 0x10b5) && (dev->device == 0x8114)) {
1491                        /*
1492                         * The pin field is one based, not zero. We
1493                         * need to swizzle it by minus two.
1494                         */
1495                        pin = ((pin - 3) & 3) + 1;
1496                }
1497        }
1498        /*
1499         * The -1 is because pin starts with one, not zero. It might
1500         * be that this equation needs to include the slot number, but
1501         * I don't have hardware to check that against.
1502         */
1503        return pin - 1 + OCTEON_IRQ_PCI_INT0;
1504}
1505
1506static  void set_cfg_read_retry(u32 retry_cnt)
1507{
1508        union cvmx_pemx_ctl_status pemx_ctl;
1509        pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
1510        pemx_ctl.s.cfg_rtry = retry_cnt;
1511        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
1512}
1513
1514
1515static u32 disable_cfg_read_retry(void)
1516{
1517        u32 retry_cnt;
1518
1519        union cvmx_pemx_ctl_status pemx_ctl;
1520        pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
1521        retry_cnt =  pemx_ctl.s.cfg_rtry;
1522        pemx_ctl.s.cfg_rtry = 0;
1523        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
1524        return retry_cnt;
1525}
1526
1527static int is_cfg_retry(void)
1528{
1529        union cvmx_pemx_int_sum pemx_int_sum;
1530        pemx_int_sum.u64 = cvmx_read_csr(CVMX_PEMX_INT_SUM(1));
1531        if (pemx_int_sum.s.crs_dr)
1532                return 1;
1533        return 0;
1534}
1535
1536/*
1537 * Read a value from configuration space
1538 *
1539 */
1540static int octeon_pcie_read_config(unsigned int pcie_port, struct pci_bus *bus,
1541                                   unsigned int devfn, int reg, int size,
1542                                   u32 *val)
1543{
1544        union octeon_cvmemctl cvmmemctl;
1545        union octeon_cvmemctl cvmmemctl_save;
1546        int bus_number = bus->number;
1547        int cfg_retry = 0;
1548        int retry_cnt = 0;
1549        int max_retry_cnt = 10;
1550        u32 cfg_retry_cnt = 0;
1551
1552        cvmmemctl_save.u64 = 0;
1553        BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
1554        /*
1555         * For the top level bus make sure our hardware bus number
1556         * matches the software one
1557         */
1558        if (bus->parent == NULL) {
1559                if (enable_pcie_bus_num_war[pcie_port])
1560                        bus_number = 0;
1561                else {
1562                        union cvmx_pciercx_cfg006 pciercx_cfg006;
1563                        pciercx_cfg006.u32 = cvmx_pcie_cfgx_read(pcie_port,
1564                                             CVMX_PCIERCX_CFG006(pcie_port));
1565                        if (pciercx_cfg006.s.pbnum != bus_number) {
1566                                pciercx_cfg006.s.pbnum = bus_number;
1567                                pciercx_cfg006.s.sbnum = bus_number;
1568                                pciercx_cfg006.s.subbnum = bus_number;
1569                                cvmx_pcie_cfgx_write(pcie_port,
1570                                            CVMX_PCIERCX_CFG006(pcie_port),
1571                                            pciercx_cfg006.u32);
1572                        }
1573                }
1574        }
1575
1576        /*
1577         * PCIe only has a single device connected to Octeon. It is
1578         * always device ID 0. Don't bother doing reads for other
1579         * device IDs on the first segment.
1580         */
1581        if ((bus->parent == NULL) && (devfn >> 3 != 0))
1582                return PCIBIOS_FUNC_NOT_SUPPORTED;
1583
1584        /*
1585         * The following is a workaround for the CN57XX, CN56XX,
1586         * CN55XX, and CN54XX errata with PCIe config reads from non
1587         * existent devices.  These chips will hang the PCIe link if a
1588         * config read is performed that causes a UR response.
1589         */
1590        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
1591            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1)) {
1592                /*
1593                 * For our EBH5600 board, port 0 has a bridge with two
1594                 * PCI-X slots. We need a new special checks to make
1595                 * sure we only probe valid stuff.  The PCIe->PCI-X
1596                 * bridge only respondes to device ID 0, function
1597                 * 0-1
1598                 */
1599                if ((bus->parent == NULL) && (devfn >= 2))
1600                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1601                /*
1602                 * The PCI-X slots are device ID 2,3. Choose one of
1603                 * the below "if" blocks based on what is plugged into
1604                 * the board.
1605                 */
1606#if 1
1607                /* Use this option if you aren't using either slot */
1608                if (bus_number == 2)
1609                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1610#elif 0
1611                /*
1612                 * Use this option if you are using the first slot but
1613                 * not the second.
1614                 */
1615                if ((bus_number == 2) && (devfn >> 3 != 2))
1616                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1617#elif 0
1618                /*
1619                 * Use this option if you are using the second slot
1620                 * but not the first.
1621                 */
1622                if ((bus_number == 2) && (devfn >> 3 != 3))
1623                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1624#elif 0
1625                /* Use this opion if you are using both slots */
1626                if ((bus_number == 2) &&
1627                    !((devfn == (2 << 3)) || (devfn == (3 << 3))))
1628                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1629#endif
1630
1631                /* The following #if gives a more complicated example. This is
1632                   the required checks for running a Nitrox CN16XX-NHBX in the
1633                   slot of the EBH5600. This card has a PLX PCIe bridge with
1634                   four Nitrox PLX parts behind it */
1635#if 0
1636                /* PLX bridge with 4 ports */
1637                if ((bus_number == 4) &&
1638                    !((devfn >> 3 >= 1) && (devfn >> 3 <= 4)))
1639                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1640                /* Nitrox behind PLX 1 */
1641                if ((bus_number == 5) && (devfn >> 3 != 0))
1642                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1643                /* Nitrox behind PLX 2 */
1644                if ((bus_number == 6) && (devfn >> 3 != 0))
1645                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1646                /* Nitrox behind PLX 3 */
1647                if ((bus_number == 7) && (devfn >> 3 != 0))
1648                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1649                /* Nitrox behind PLX 4 */
1650                if ((bus_number == 8) && (devfn >> 3 != 0))
1651                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1652#endif
1653
1654                /*
1655                 * Shorten the DID timeout so bus errors for PCIe
1656                 * config reads from non existent devices happen
1657                 * faster. This allows us to continue booting even if
1658                 * the above "if" checks are wrong.  Once one of these
1659                 * errors happens, the PCIe port is dead.
1660                 */
1661                cvmmemctl_save.u64 = __read_64bit_c0_register($11, 7);
1662                cvmmemctl.u64 = cvmmemctl_save.u64;
1663                cvmmemctl.s.didtto = 2;
1664                __write_64bit_c0_register($11, 7, cvmmemctl.u64);
1665        }
1666
1667        if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
1668                cfg_retry_cnt = disable_cfg_read_retry();
1669
1670        pr_debug("pcie_cfg_rd port=%d b=%d devfn=0x%03x reg=0x%03x"
1671                 " size=%d ", pcie_port, bus_number, devfn, reg, size);
1672        do {
1673                switch (size) {
1674                case 4:
1675                        *val = cvmx_pcie_config_read32(pcie_port, bus_number,
1676                                devfn >> 3, devfn & 0x7, reg);
1677                break;
1678                case 2:
1679                        *val = cvmx_pcie_config_read16(pcie_port, bus_number,
1680                                devfn >> 3, devfn & 0x7, reg);
1681                break;
1682                case 1:
1683                        *val = cvmx_pcie_config_read8(pcie_port, bus_number,
1684                                devfn >> 3, devfn & 0x7, reg);
1685                break;
1686                default:
1687                        if (OCTEON_IS_MODEL(OCTEON_CN63XX))
1688                                set_cfg_read_retry(cfg_retry_cnt);
1689                        return PCIBIOS_FUNC_NOT_SUPPORTED;
1690                }
1691                if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) &&
1692                        (enable_pcie_14459_war)) {
1693                        cfg_retry = is_cfg_retry();
1694                        retry_cnt++;
1695                        if (retry_cnt > max_retry_cnt) {
1696                                pr_err(" pcie cfg_read retries failed. retry_cnt=%d\n",
1697                                       retry_cnt);
1698                                cfg_retry = 0;
1699                        }
1700                }
1701        } while (cfg_retry);
1702
1703        if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
1704                set_cfg_read_retry(cfg_retry_cnt);
1705        pr_debug("val=%08x  : tries=%02d\n", *val, retry_cnt);
1706        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
1707            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
1708                write_c0_cvmmemctl(cvmmemctl_save.u64);
1709        return PCIBIOS_SUCCESSFUL;
1710}
1711
1712static int octeon_pcie0_read_config(struct pci_bus *bus, unsigned int devfn,
1713                                    int reg, int size, u32 *val)
1714{
1715        return octeon_pcie_read_config(0, bus, devfn, reg, size, val);
1716}
1717
1718static int octeon_pcie1_read_config(struct pci_bus *bus, unsigned int devfn,
1719                                    int reg, int size, u32 *val)
1720{
1721        return octeon_pcie_read_config(1, bus, devfn, reg, size, val);
1722}
1723
1724static int octeon_dummy_read_config(struct pci_bus *bus, unsigned int devfn,
1725                                    int reg, int size, u32 *val)
1726{
1727        return PCIBIOS_FUNC_NOT_SUPPORTED;
1728}
1729
1730/*
1731 * Write a value to PCI configuration space
1732 */
1733static int octeon_pcie_write_config(unsigned int pcie_port, struct pci_bus *bus,
1734                                    unsigned int devfn, int reg,
1735                                    int size, u32 val)
1736{
1737        int bus_number = bus->number;
1738
1739        BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
1740
1741        if ((bus->parent == NULL) && (enable_pcie_bus_num_war[pcie_port]))
1742                bus_number = 0;
1743
1744        pr_debug("pcie_cfg_wr port=%d b=%d devfn=0x%03x"
1745                 " reg=0x%03x size=%d val=%08x\n", pcie_port, bus_number, devfn,
1746                 reg, size, val);
1747
1748
1749        switch (size) {
1750        case 4:
1751                cvmx_pcie_config_write32(pcie_port, bus_number, devfn >> 3,
1752                                         devfn & 0x7, reg, val);
1753                break;
1754        case 2:
1755                cvmx_pcie_config_write16(pcie_port, bus_number, devfn >> 3,
1756                                         devfn & 0x7, reg, val);
1757                break;
1758        case 1:
1759                cvmx_pcie_config_write8(pcie_port, bus_number, devfn >> 3,
1760                                        devfn & 0x7, reg, val);
1761                break;
1762        default:
1763                return PCIBIOS_FUNC_NOT_SUPPORTED;
1764        }
1765#if PCI_CONFIG_SPACE_DELAY
1766        /*
1767         * Delay on writes so that devices have time to come up. Some
1768         * bridges need this to allow time for the secondary busses to
1769         * work
1770         */
1771        udelay(PCI_CONFIG_SPACE_DELAY);
1772#endif
1773        return PCIBIOS_SUCCESSFUL;
1774}
1775
1776static int octeon_pcie0_write_config(struct pci_bus *bus, unsigned int devfn,
1777                                     int reg, int size, u32 val)
1778{
1779        return octeon_pcie_write_config(0, bus, devfn, reg, size, val);
1780}
1781
1782static int octeon_pcie1_write_config(struct pci_bus *bus, unsigned int devfn,
1783                                     int reg, int size, u32 val)
1784{
1785        return octeon_pcie_write_config(1, bus, devfn, reg, size, val);
1786}
1787
1788static int octeon_dummy_write_config(struct pci_bus *bus, unsigned int devfn,
1789                                     int reg, int size, u32 val)
1790{
1791        return PCIBIOS_FUNC_NOT_SUPPORTED;
1792}
1793
1794static struct pci_ops octeon_pcie0_ops = {
1795        octeon_pcie0_read_config,
1796        octeon_pcie0_write_config,
1797};
1798
1799static struct resource octeon_pcie0_mem_resource = {
1800        .name = "Octeon PCIe0 MEM",
1801        .flags = IORESOURCE_MEM,
1802};
1803
1804static struct resource octeon_pcie0_io_resource = {
1805        .name = "Octeon PCIe0 IO",
1806        .flags = IORESOURCE_IO,
1807};
1808
1809static struct pci_controller octeon_pcie0_controller = {
1810        .pci_ops = &octeon_pcie0_ops,
1811        .mem_resource = &octeon_pcie0_mem_resource,
1812        .io_resource = &octeon_pcie0_io_resource,
1813};
1814
1815static struct pci_ops octeon_pcie1_ops = {
1816        octeon_pcie1_read_config,
1817        octeon_pcie1_write_config,
1818};
1819
1820static struct resource octeon_pcie1_mem_resource = {
1821        .name = "Octeon PCIe1 MEM",
1822        .flags = IORESOURCE_MEM,
1823};
1824
1825static struct resource octeon_pcie1_io_resource = {
1826        .name = "Octeon PCIe1 IO",
1827        .flags = IORESOURCE_IO,
1828};
1829
1830static struct pci_controller octeon_pcie1_controller = {
1831        .pci_ops = &octeon_pcie1_ops,
1832        .mem_resource = &octeon_pcie1_mem_resource,
1833        .io_resource = &octeon_pcie1_io_resource,
1834};
1835
1836static struct pci_ops octeon_dummy_ops = {
1837        octeon_dummy_read_config,
1838        octeon_dummy_write_config,
1839};
1840
1841static struct resource octeon_dummy_mem_resource = {
1842        .name = "Virtual PCIe MEM",
1843        .flags = IORESOURCE_MEM,
1844};
1845
1846static struct resource octeon_dummy_io_resource = {
1847        .name = "Virtual PCIe IO",
1848        .flags = IORESOURCE_IO,
1849};
1850
1851static struct pci_controller octeon_dummy_controller = {
1852        .pci_ops = &octeon_dummy_ops,
1853        .mem_resource = &octeon_dummy_mem_resource,
1854        .io_resource = &octeon_dummy_io_resource,
1855};
1856
1857static int device_needs_bus_num_war(uint32_t deviceid)
1858{
1859#define IDT_VENDOR_ID 0x111d
1860
1861        if ((deviceid  & 0xffff) == IDT_VENDOR_ID)
1862                return 1;
1863        return 0;
1864}
1865
1866/**
1867 * Initialize the Octeon PCIe controllers
1868 *
1869 * Returns
1870 */
1871static int __init octeon_pcie_setup(void)
1872{
1873        int result;
1874        int host_mode;
1875        int srio_war15205 = 0, port;
1876        union cvmx_sli_ctl_portx sli_ctl_portx;
1877        union cvmx_sriox_status_reg sriox_status_reg;
1878
1879        /* These chips don't have PCIe */
1880        if (!octeon_has_feature(OCTEON_FEATURE_PCIE))
1881                return 0;
1882
1883        /* No PCIe simulation */
1884        if (octeon_is_simulation())
1885                return 0;
1886
1887        /* Disable PCI if instructed on the command line */
1888        if (pcie_disable)
1889                return 0;
1890
1891        /* Point pcibios_map_irq() to the PCIe version of it */
1892        octeon_pcibios_map_irq = octeon_pcie_pcibios_map_irq;
1893
1894        /*
1895         * PCIe I/O range. It is based on port 0 but includes up until
1896         * port 1's end.
1897         */
1898        set_io_port_base(CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0)));
1899        ioport_resource.start = 0;
1900        ioport_resource.end =
1901                cvmx_pcie_get_io_base_address(1) -
1902                cvmx_pcie_get_io_base_address(0) + cvmx_pcie_get_io_size(1) - 1;
1903
1904        /*
1905         * Create a dummy PCIe controller to swallow up bus 0. IDT bridges
1906         * don't work if the primary bus number is zero. Here we add a fake
1907         * PCIe controller that the kernel will give bus 0. This allows
1908         * us to not change the normal kernel bus enumeration
1909         */
1910        octeon_dummy_controller.io_map_base = -1;
1911        octeon_dummy_controller.mem_resource->start = (1ull<<48);
1912        octeon_dummy_controller.mem_resource->end = (1ull<<48);
1913        register_pci_controller(&octeon_dummy_controller);
1914
1915        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
1916                union cvmx_npei_ctl_status npei_ctl_status;
1917                npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
1918                host_mode = npei_ctl_status.s.host_mode;
1919                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE;
1920        } else {
1921                union cvmx_mio_rst_ctlx mio_rst_ctl;
1922                mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(0));
1923                host_mode = mio_rst_ctl.s.host_mode;
1924                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE2;
1925        }
1926
1927        if (host_mode) {
1928                pr_notice("PCIe: Initializing port 0\n");
1929                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
1930                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
1931                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
1932                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(0));
1933                        if (sriox_status_reg.s.srio) {
1934                                srio_war15205 += 1;      /* Port is SRIO */
1935                                port = 0;
1936                        }
1937                }
1938                result = cvmx_pcie_rc_initialize(0);
1939                if (result == 0) {
1940                        uint32_t device0;
1941                        /* Memory offsets are physical addresses */
1942                        octeon_pcie0_controller.mem_offset =
1943                                cvmx_pcie_get_mem_base_address(0);
1944                        /* IO offsets are Mips virtual addresses */
1945                        octeon_pcie0_controller.io_map_base =
1946                                CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address
1947                                                (0));
1948                        octeon_pcie0_controller.io_offset = 0;
1949                        /*
1950                         * To keep things similar to PCI, we start
1951                         * device addresses at the same place as PCI
1952                         * uisng big bar support. This normally
1953                         * translates to 4GB-256MB, which is the same
1954                         * as most x86 PCs.
1955                         */
1956                        octeon_pcie0_controller.mem_resource->start =
1957                                cvmx_pcie_get_mem_base_address(0) +
1958                                (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
1959                        octeon_pcie0_controller.mem_resource->end =
1960                                cvmx_pcie_get_mem_base_address(0) +
1961                                cvmx_pcie_get_mem_size(0) - 1;
1962                        /*
1963                         * Ports must be above 16KB for the ISA bus
1964                         * filtering in the PCI-X to PCI bridge.
1965                         */
1966                        octeon_pcie0_controller.io_resource->start = 4 << 10;
1967                        octeon_pcie0_controller.io_resource->end =
1968                                cvmx_pcie_get_io_size(0) - 1;
1969                        msleep(100); /* Some devices need extra time */
1970                        register_pci_controller(&octeon_pcie0_controller);
1971                        device0 = cvmx_pcie_config_read32(0, 0, 0, 0, 0);
1972                        enable_pcie_bus_num_war[0] =
1973                                device_needs_bus_num_war(device0);
1974                }
1975        } else {
1976                pr_notice("PCIe: Port 0 in endpoint mode, skipping.\n");
1977                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
1978                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
1979                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
1980                        srio_war15205 += 1;
1981                        port = 0;
1982                }
1983        }
1984
1985        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
1986                host_mode = 1;
1987                /* Skip the 2nd port on CN52XX if port 0 is in 4 lane mode */
1988                if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
1989                        union cvmx_npei_dbg_data dbg_data;
1990                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
1991                        if (dbg_data.cn52xx.qlm0_link_width)
1992                                host_mode = 0;
1993                }
1994        } else {
1995                union cvmx_mio_rst_ctlx mio_rst_ctl;
1996                mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(1));
1997                host_mode = mio_rst_ctl.s.host_mode;
1998        }
1999
2000        if (host_mode) {
2001                pr_notice("PCIe: Initializing port 1\n");
2002                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
2003                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
2004                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
2005                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(1));
2006                        if (sriox_status_reg.s.srio) {
2007                                srio_war15205 += 1;      /* Port is SRIO */
2008                                port = 1;
2009                        }
2010                }
2011                result = cvmx_pcie_rc_initialize(1);
2012                if (result == 0) {
2013                        uint32_t device0;
2014                        /* Memory offsets are physical addresses */
2015                        octeon_pcie1_controller.mem_offset =
2016                                cvmx_pcie_get_mem_base_address(1);
2017                        /*
2018                         * To calculate the address for accessing the 2nd PCIe device,
2019                         * either 'io_map_base' (pci_iomap()), or 'mips_io_port_base'
2020                         * (ioport_map()) value is added to
2021                         * pci_resource_start(dev,bar)). The 'mips_io_port_base' is set
2022                         * only once based on first PCIe. Also changing 'io_map_base'
2023                         * based on first slot's value so that both the routines will
2024                         * work properly.
2025                         */
2026                        octeon_pcie1_controller.io_map_base =
2027                                CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0));
2028                        /* IO offsets are Mips virtual addresses */
2029                        octeon_pcie1_controller.io_offset =
2030                                cvmx_pcie_get_io_base_address(1) -
2031                                cvmx_pcie_get_io_base_address(0);
2032                        /*
2033                         * To keep things similar to PCI, we start device
2034                         * addresses at the same place as PCI uisng big bar
2035                         * support. This normally translates to 4GB-256MB,
2036                         * which is the same as most x86 PCs.
2037                         */
2038                        octeon_pcie1_controller.mem_resource->start =
2039                                cvmx_pcie_get_mem_base_address(1) + (4ul << 30) -
2040                                (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
2041                        octeon_pcie1_controller.mem_resource->end =
2042                                cvmx_pcie_get_mem_base_address(1) +
2043                                cvmx_pcie_get_mem_size(1) - 1;
2044                        /*
2045                         * Ports must be above 16KB for the ISA bus filtering
2046                         * in the PCI-X to PCI bridge.
2047                         */
2048                        octeon_pcie1_controller.io_resource->start =
2049                                cvmx_pcie_get_io_base_address(1) -
2050                                cvmx_pcie_get_io_base_address(0);
2051                        octeon_pcie1_controller.io_resource->end =
2052                                octeon_pcie1_controller.io_resource->start +
2053                                cvmx_pcie_get_io_size(1) - 1;
2054                        msleep(100); /* Some devices need extra time */
2055                        register_pci_controller(&octeon_pcie1_controller);
2056                        device0 = cvmx_pcie_config_read32(1, 0, 0, 0, 0);
2057                        enable_pcie_bus_num_war[1] =
2058                                device_needs_bus_num_war(device0);
2059                }
2060        } else {
2061                pr_notice("PCIe: Port 1 not in root complex mode, skipping.\n");
2062                /* CN63XX pass 1_x/2.0 errata PCIe-15205  */
2063                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
2064                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
2065                        srio_war15205 += 1;
2066                        port = 1;
2067                }
2068        }
2069
2070        /*
2071         * CN63XX pass 1_x/2.0 errata PCIe-15205 requires setting all
2072         * of SRIO MACs SLI_CTL_PORT*[INT*_MAP] to similar value and
2073         * all of PCIe Macs SLI_CTL_PORT*[INT*_MAP] to different value
2074         * from the previous set values
2075         */
2076        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
2077                OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
2078                if (srio_war15205 == 1) {
2079                        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(port));
2080                        sli_ctl_portx.s.inta_map = 1;
2081                        sli_ctl_portx.s.intb_map = 1;
2082                        sli_ctl_portx.s.intc_map = 1;
2083                        sli_ctl_portx.s.intd_map = 1;
2084                        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(port), sli_ctl_portx.u64);
2085
2086                        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(!port));
2087                        sli_ctl_portx.s.inta_map = 0;
2088                        sli_ctl_portx.s.intb_map = 0;
2089                        sli_ctl_portx.s.intc_map = 0;
2090                        sli_ctl_portx.s.intd_map = 0;
2091                        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(!port), sli_ctl_portx.u64);
2092                }
2093        }
2094
2095        octeon_pci_dma_init();
2096
2097        return 0;
2098}
2099arch_initcall(octeon_pcie_setup);
2100