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[linux/fpc-iii.git] / arch / mips / pci / pcie-octeon.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2007, 2008, 2009, 2010, 2011 Cavium Networks
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/module.h>

#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-npei-defs.h>
#include <asm/octeon/cvmx-pciercx-defs.h>
#include <asm/octeon/cvmx-pescx-defs.h>
#include <asm/octeon/cvmx-pexp-defs.h>
#include <asm/octeon/cvmx-pemx-defs.h>
#include <asm/octeon/cvmx-dpi-defs.h>
#include <asm/octeon/cvmx-sli-defs.h>
#include <asm/octeon/cvmx-sriox-defs.h>
#include <asm/octeon/cvmx-helper-errata.h>
#include <asm/octeon/pci-octeon.h>

#define MRRS_CN5XXX 0 /* 128 byte Max Read Request Size */
#define MPS_CN5XXX  0 /* 128 byte Max Packet Size (Limit of most PCs) */
#define MRRS_CN6XXX 3 /* 1024 byte Max Read Request Size */
#define MPS_CN6XXX  0 /* 128 byte Max Packet Size (Limit of most PCs) */

/* Module parameter to disable PCI probing */
static int pcie_disable;
module_param(pcie_disable, int, S_IRUGO);

static int enable_pcie_14459_war;
static int enable_pcie_bus_num_war[2];

union cvmx_pcie_address {
        uint64_t u64;
        struct {
                uint64_t upper:2;       /* Normally 2 for XKPHYS */
                uint64_t reserved_49_61:13;     /* Must be zero */
                uint64_t io:1;  /* 1 for IO space access */
                uint64_t did:5; /* PCIe DID = 3 */
                uint64_t subdid:3;      /* PCIe SubDID = 1 */
                uint64_t reserved_36_39:4;      /* Must be zero */
                uint64_t es:2;  /* Endian swap = 1 */
                uint64_t port:2;        /* PCIe port 0,1 */
                uint64_t reserved_29_31:3;      /* Must be zero */
                /*
                 * Selects the type of the configuration request (0 = type 0,
                 * 1 = type 1).
                 */
                uint64_t ty:1;
                /* Target bus number sent in the ID in the request. */
                uint64_t bus:8;
                /*
                 * Target device number sent in the ID in the
                 * request. Note that Dev must be zero for type 0
                 * configuration requests.
                 */
                uint64_t dev:5;
                /* Target function number sent in the ID in the request. */
                uint64_t func:3;
                /*
                 * Selects a register in the configuration space of
                 * the target.
                 */
                uint64_t reg:12;
        } config;
        struct {
                uint64_t upper:2;       /* Normally 2 for XKPHYS */
                uint64_t reserved_49_61:13;     /* Must be zero */
                uint64_t io:1;  /* 1 for IO space access */
                uint64_t did:5; /* PCIe DID = 3 */
                uint64_t subdid:3;      /* PCIe SubDID = 2 */
                uint64_t reserved_36_39:4;      /* Must be zero */
                uint64_t es:2;  /* Endian swap = 1 */
                uint64_t port:2;        /* PCIe port 0,1 */
                uint64_t address:32;    /* PCIe IO address */
        } io;
        struct {
                uint64_t upper:2;       /* Normally 2 for XKPHYS */
                uint64_t reserved_49_61:13;     /* Must be zero */
                uint64_t io:1;  /* 1 for IO space access */
                uint64_t did:5; /* PCIe DID = 3 */
                uint64_t subdid:3;      /* PCIe SubDID = 3-6 */
                uint64_t reserved_36_39:4;      /* Must be zero */
                uint64_t address:36;    /* PCIe Mem address */
        } mem;
};

static int cvmx_pcie_rc_initialize(int pcie_port);

#include <dma-coherence.h>

/**
 * Return the Core virtual base address for PCIe IO access. IOs are
 * read/written as an offset from this address.
 *
 * @pcie_port: PCIe port the IO is for
 *
 * Returns 64bit Octeon IO base address for read/write
 */
static inline uint64_t cvmx_pcie_get_io_base_address(int pcie_port)
{
        union cvmx_pcie_address pcie_addr;
        pcie_addr.u64 = 0;
        pcie_addr.io.upper = 0;
        pcie_addr.io.io = 1;
        pcie_addr.io.did = 3;
        pcie_addr.io.subdid = 2;
        pcie_addr.io.es = 1;
        pcie_addr.io.port = pcie_port;
        return pcie_addr.u64;
}

/**
 * Size of the IO address region returned at address
 * cvmx_pcie_get_io_base_address()
 *
 * @pcie_port: PCIe port the IO is for
 *
 * Returns Size of the IO window
 */
static inline uint64_t cvmx_pcie_get_io_size(int pcie_port)
{
        return 1ull << 32;
}

/**
 * Return the Core virtual base address for PCIe MEM access. Memory is
 * read/written as an offset from this address.
 *
 * @pcie_port: PCIe port the IO is for
 *
 * Returns 64bit Octeon IO base address for read/write
 */
static inline uint64_t cvmx_pcie_get_mem_base_address(int pcie_port)
{
        union cvmx_pcie_address pcie_addr;
        pcie_addr.u64 = 0;
        pcie_addr.mem.upper = 0;
        pcie_addr.mem.io = 1;
        pcie_addr.mem.did = 3;
        pcie_addr.mem.subdid = 3 + pcie_port;
        return pcie_addr.u64;
}

/**
 * Size of the Mem address region returned at address
 * cvmx_pcie_get_mem_base_address()
 *
 * @pcie_port: PCIe port the IO is for
 *
 * Returns Size of the Mem window
 */
static inline uint64_t cvmx_pcie_get_mem_size(int pcie_port)
{
        return 1ull << 36;
}

/**
 * Read a PCIe config space register indirectly. This is used for
 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
 *
 * @pcie_port:  PCIe port to read from
 * @cfg_offset: Address to read
 *
 * Returns Value read
 */
static uint32_t cvmx_pcie_cfgx_read(int pcie_port, uint32_t cfg_offset)
{
        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
                union cvmx_pescx_cfg_rd pescx_cfg_rd;
                pescx_cfg_rd.u64 = 0;
                pescx_cfg_rd.s.addr = cfg_offset;
                cvmx_write_csr(CVMX_PESCX_CFG_RD(pcie_port), pescx_cfg_rd.u64);
                pescx_cfg_rd.u64 = cvmx_read_csr(CVMX_PESCX_CFG_RD(pcie_port));
                return pescx_cfg_rd.s.data;
        } else {
                union cvmx_pemx_cfg_rd pemx_cfg_rd;
                pemx_cfg_rd.u64 = 0;
                pemx_cfg_rd.s.addr = cfg_offset;
                cvmx_write_csr(CVMX_PEMX_CFG_RD(pcie_port), pemx_cfg_rd.u64);
                pemx_cfg_rd.u64 = cvmx_read_csr(CVMX_PEMX_CFG_RD(pcie_port));
                return pemx_cfg_rd.s.data;
        }
}

/**
 * Write a PCIe config space register indirectly. This is used for
 * registers of the form PCIEEP_CFG??? and PCIERC?_CFG???.
 *
 * @pcie_port:  PCIe port to write to
 * @cfg_offset: Address to write
 * @val:        Value to write
 */
static void cvmx_pcie_cfgx_write(int pcie_port, uint32_t cfg_offset,
                                 uint32_t val)
{
        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
                union cvmx_pescx_cfg_wr pescx_cfg_wr;
                pescx_cfg_wr.u64 = 0;
                pescx_cfg_wr.s.addr = cfg_offset;
                pescx_cfg_wr.s.data = val;
                cvmx_write_csr(CVMX_PESCX_CFG_WR(pcie_port), pescx_cfg_wr.u64);
        } else {
                union cvmx_pemx_cfg_wr pemx_cfg_wr;
                pemx_cfg_wr.u64 = 0;
                pemx_cfg_wr.s.addr = cfg_offset;
                pemx_cfg_wr.s.data = val;
                cvmx_write_csr(CVMX_PEMX_CFG_WR(pcie_port), pemx_cfg_wr.u64);
        }
}

/**
 * Build a PCIe config space request address for a device
 *
 * @pcie_port: PCIe port to access
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 *
 * Returns 64bit Octeon IO address
 */
static inline uint64_t __cvmx_pcie_build_config_addr(int pcie_port, int bus,
                                                     int dev, int fn, int reg)
{
        union cvmx_pcie_address pcie_addr;
        union cvmx_pciercx_cfg006 pciercx_cfg006;

        pciercx_cfg006.u32 =
            cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG006(pcie_port));
        if ((bus <= pciercx_cfg006.s.pbnum) && (dev != 0))
                return 0;

        pcie_addr.u64 = 0;
        pcie_addr.config.upper = 2;
        pcie_addr.config.io = 1;
        pcie_addr.config.did = 3;
        pcie_addr.config.subdid = 1;
        pcie_addr.config.es = 1;
        pcie_addr.config.port = pcie_port;
        pcie_addr.config.ty = (bus > pciercx_cfg006.s.pbnum);
        pcie_addr.config.bus = bus;
        pcie_addr.config.dev = dev;
        pcie_addr.config.func = fn;
        pcie_addr.config.reg = reg;
        return pcie_addr.u64;
}

/**
 * Read 8bits from a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 *
 * Returns Result of the read
 */
static uint8_t cvmx_pcie_config_read8(int pcie_port, int bus, int dev,
                                      int fn, int reg)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                return cvmx_read64_uint8(address);
        else
                return 0xff;
}

/**
 * Read 16bits from a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 *
 * Returns Result of the read
 */
static uint16_t cvmx_pcie_config_read16(int pcie_port, int bus, int dev,
                                        int fn, int reg)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                return le16_to_cpu(cvmx_read64_uint16(address));
        else
                return 0xffff;
}

/**
 * Read 32bits from a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 *
 * Returns Result of the read
 */
static uint32_t cvmx_pcie_config_read32(int pcie_port, int bus, int dev,
                                        int fn, int reg)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                return le32_to_cpu(cvmx_read64_uint32(address));
        else
                return 0xffffffff;
}

/**
 * Write 8bits to a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 * @val:       Value to write
 */
static void cvmx_pcie_config_write8(int pcie_port, int bus, int dev, int fn,
                                    int reg, uint8_t val)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                cvmx_write64_uint8(address, val);
}

/**
 * Write 16bits to a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 * @val:       Value to write
 */
static void cvmx_pcie_config_write16(int pcie_port, int bus, int dev, int fn,
                                     int reg, uint16_t val)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                cvmx_write64_uint16(address, cpu_to_le16(val));
}

/**
 * Write 32bits to a Device's config space
 *
 * @pcie_port: PCIe port the device is on
 * @bus:       Sub bus
 * @dev:       Device ID
 * @fn:        Device sub function
 * @reg:       Register to access
 * @val:       Value to write
 */
static void cvmx_pcie_config_write32(int pcie_port, int bus, int dev, int fn,
                                     int reg, uint32_t val)
{
        uint64_t address =
            __cvmx_pcie_build_config_addr(pcie_port, bus, dev, fn, reg);
        if (address)
                cvmx_write64_uint32(address, cpu_to_le32(val));
}

/**
 * Initialize the RC config space CSRs
 *
 * @pcie_port: PCIe port to initialize
 */
static void __cvmx_pcie_rc_initialize_config_space(int pcie_port)
{
        union cvmx_pciercx_cfg030 pciercx_cfg030;
        union cvmx_pciercx_cfg070 pciercx_cfg070;
        union cvmx_pciercx_cfg001 pciercx_cfg001;
        union cvmx_pciercx_cfg032 pciercx_cfg032;
        union cvmx_pciercx_cfg006 pciercx_cfg006;
        union cvmx_pciercx_cfg008 pciercx_cfg008;
        union cvmx_pciercx_cfg009 pciercx_cfg009;
        union cvmx_pciercx_cfg010 pciercx_cfg010;
        union cvmx_pciercx_cfg011 pciercx_cfg011;
        union cvmx_pciercx_cfg035 pciercx_cfg035;
        union cvmx_pciercx_cfg075 pciercx_cfg075;
        union cvmx_pciercx_cfg034 pciercx_cfg034;

        /* Max Payload Size (PCIE*_CFG030[MPS]) */
        /* Max Read Request Size (PCIE*_CFG030[MRRS]) */
        /* Relaxed-order, no-snoop enables (PCIE*_CFG030[RO_EN,NS_EN] */
        /* Error Message Enables (PCIE*_CFG030[CE_EN,NFE_EN,FE_EN,UR_EN]) */

        pciercx_cfg030.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG030(pcie_port));
        if (OCTEON_IS_MODEL(OCTEON_CN5XXX)) {
                pciercx_cfg030.s.mps = MPS_CN5XXX;
                pciercx_cfg030.s.mrrs = MRRS_CN5XXX;
        } else {
                pciercx_cfg030.s.mps = MPS_CN6XXX;
                pciercx_cfg030.s.mrrs = MRRS_CN6XXX;
        }
        /*
         * Enable relaxed order processing. This will allow devices to
         * affect read response ordering.
         */
        pciercx_cfg030.s.ro_en = 1;
        /* Enable no snoop processing. Not used by Octeon */
        pciercx_cfg030.s.ns_en = 1;
        /* Correctable error reporting enable. */
        pciercx_cfg030.s.ce_en = 1;
        /* Non-fatal error reporting enable. */
        pciercx_cfg030.s.nfe_en = 1;
        /* Fatal error reporting enable. */
        pciercx_cfg030.s.fe_en = 1;
        /* Unsupported request reporting enable. */
        pciercx_cfg030.s.ur_en = 1;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG030(pcie_port), pciercx_cfg030.u32);


        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
                union cvmx_npei_ctl_status2 npei_ctl_status2;
                /*
                 * Max Payload Size (NPEI_CTL_STATUS2[MPS]) must match
                 * PCIE*_CFG030[MPS].  Max Read Request Size
                 * (NPEI_CTL_STATUS2[MRRS]) must not exceed
                 * PCIE*_CFG030[MRRS]
                 */
                npei_ctl_status2.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS2);
                /* Max payload size = 128 bytes for best Octeon DMA performance */
                npei_ctl_status2.s.mps = MPS_CN5XXX;
                /* Max read request size = 128 bytes for best Octeon DMA performance */
                npei_ctl_status2.s.mrrs = MRRS_CN5XXX;
                if (pcie_port)
                        npei_ctl_status2.s.c1_b1_s = 3; /* Port1 BAR1 Size 256MB */
                else
                        npei_ctl_status2.s.c0_b1_s = 3; /* Port0 BAR1 Size 256MB */

                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS2, npei_ctl_status2.u64);
        } else {
                /*
                 * Max Payload Size (DPI_SLI_PRTX_CFG[MPS]) must match
                 * PCIE*_CFG030[MPS].  Max Read Request Size
                 * (DPI_SLI_PRTX_CFG[MRRS]) must not exceed
                 * PCIE*_CFG030[MRRS].
                 */
                union cvmx_dpi_sli_prtx_cfg prt_cfg;
                union cvmx_sli_s2m_portx_ctl sli_s2m_portx_ctl;
                prt_cfg.u64 = cvmx_read_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port));
                prt_cfg.s.mps = MPS_CN6XXX;
                prt_cfg.s.mrrs = MRRS_CN6XXX;
                /* Max outstanding load request. */
                prt_cfg.s.molr = 32;
                cvmx_write_csr(CVMX_DPI_SLI_PRTX_CFG(pcie_port), prt_cfg.u64);

                sli_s2m_portx_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port));
                sli_s2m_portx_ctl.s.mrrs = MRRS_CN6XXX;
                cvmx_write_csr(CVMX_PEXP_SLI_S2M_PORTX_CTL(pcie_port), sli_s2m_portx_ctl.u64);
        }

        /* ECRC Generation (PCIE*_CFG070[GE,CE]) */
        pciercx_cfg070.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG070(pcie_port));
        pciercx_cfg070.s.ge = 1;        /* ECRC generation enable. */
        pciercx_cfg070.s.ce = 1;        /* ECRC check enable. */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG070(pcie_port), pciercx_cfg070.u32);

        /*
         * Access Enables (PCIE*_CFG001[MSAE,ME])
         * ME and MSAE should always be set.
         * Interrupt Disable (PCIE*_CFG001[I_DIS])
         * System Error Message Enable (PCIE*_CFG001[SEE])
         */
        pciercx_cfg001.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG001(pcie_port));
        pciercx_cfg001.s.msae = 1;      /* Memory space enable. */
        pciercx_cfg001.s.me = 1;        /* Bus master enable. */
        pciercx_cfg001.s.i_dis = 1;     /* INTx assertion disable. */
        pciercx_cfg001.s.see = 1;       /* SERR# enable */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG001(pcie_port), pciercx_cfg001.u32);

        /* Advanced Error Recovery Message Enables */
        /* (PCIE*_CFG066,PCIE*_CFG067,PCIE*_CFG069) */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG066(pcie_port), 0);
        /* Use CVMX_PCIERCX_CFG067 hardware default */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG069(pcie_port), 0);


        /* Active State Power Management (PCIE*_CFG032[ASLPC]) */
        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
        pciercx_cfg032.s.aslpc = 0; /* Active state Link PM control. */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG032(pcie_port), pciercx_cfg032.u32);

        /*
         * Link Width Mode (PCIERCn_CFG452[LME]) - Set during
         * cvmx_pcie_rc_initialize_link()
         *
         * Primary Bus Number (PCIERCn_CFG006[PBNUM])
         *
         * We set the primary bus number to 1 so IDT bridges are
         * happy. They don't like zero.
         */
        pciercx_cfg006.u32 = 0;
        pciercx_cfg006.s.pbnum = 1;
        pciercx_cfg006.s.sbnum = 1;
        pciercx_cfg006.s.subbnum = 1;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG006(pcie_port), pciercx_cfg006.u32);


        /*
         * Memory-mapped I/O BAR (PCIERCn_CFG008)
         * Most applications should disable the memory-mapped I/O BAR by
         * setting PCIERCn_CFG008[ML_ADDR] < PCIERCn_CFG008[MB_ADDR]
         */
        pciercx_cfg008.u32 = 0;
        pciercx_cfg008.s.mb_addr = 0x100;
        pciercx_cfg008.s.ml_addr = 0;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG008(pcie_port), pciercx_cfg008.u32);


        /*
         * Prefetchable BAR (PCIERCn_CFG009,PCIERCn_CFG010,PCIERCn_CFG011)
         * Most applications should disable the prefetchable BAR by setting
         * PCIERCn_CFG011[UMEM_LIMIT],PCIERCn_CFG009[LMEM_LIMIT] <
         * PCIERCn_CFG010[UMEM_BASE],PCIERCn_CFG009[LMEM_BASE]
         */
        pciercx_cfg009.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG009(pcie_port));
        pciercx_cfg010.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG010(pcie_port));
        pciercx_cfg011.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG011(pcie_port));
        pciercx_cfg009.s.lmem_base = 0x100;
        pciercx_cfg009.s.lmem_limit = 0;
        pciercx_cfg010.s.umem_base = 0x100;
        pciercx_cfg011.s.umem_limit = 0;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG009(pcie_port), pciercx_cfg009.u32);
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG010(pcie_port), pciercx_cfg010.u32);
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG011(pcie_port), pciercx_cfg011.u32);

        /*
         * System Error Interrupt Enables (PCIERCn_CFG035[SECEE,SEFEE,SENFEE])
         * PME Interrupt Enables (PCIERCn_CFG035[PMEIE])
        */
        pciercx_cfg035.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG035(pcie_port));
        pciercx_cfg035.s.secee = 1; /* System error on correctable error enable. */
        pciercx_cfg035.s.sefee = 1; /* System error on fatal error enable. */
        pciercx_cfg035.s.senfee = 1; /* System error on non-fatal error enable. */
        pciercx_cfg035.s.pmeie = 1; /* PME interrupt enable. */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG035(pcie_port), pciercx_cfg035.u32);

        /*
         * Advanced Error Recovery Interrupt Enables
         * (PCIERCn_CFG075[CERE,NFERE,FERE])
         */
        pciercx_cfg075.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG075(pcie_port));
        pciercx_cfg075.s.cere = 1; /* Correctable error reporting enable. */
        pciercx_cfg075.s.nfere = 1; /* Non-fatal error reporting enable. */
        pciercx_cfg075.s.fere = 1; /* Fatal error reporting enable. */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG075(pcie_port), pciercx_cfg075.u32);

        /*
         * HP Interrupt Enables (PCIERCn_CFG034[HPINT_EN],
         * PCIERCn_CFG034[DLLS_EN,CCINT_EN])
         */
        pciercx_cfg034.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG034(pcie_port));
        pciercx_cfg034.s.hpint_en = 1; /* Hot-plug interrupt enable. */
        pciercx_cfg034.s.dlls_en = 1; /* Data Link Layer state changed enable */
        pciercx_cfg034.s.ccint_en = 1; /* Command completed interrupt enable. */
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG034(pcie_port), pciercx_cfg034.u32);
}

/**
 * Initialize a host mode PCIe gen 1 link. This function takes a PCIe
 * port from reset to a link up state. Software can then begin
 * configuring the rest of the link.
 *
 * @pcie_port: PCIe port to initialize
 *
 * Returns Zero on success
 */
static int __cvmx_pcie_rc_initialize_link_gen1(int pcie_port)
{
        uint64_t start_cycle;
        union cvmx_pescx_ctl_status pescx_ctl_status;
        union cvmx_pciercx_cfg452 pciercx_cfg452;
        union cvmx_pciercx_cfg032 pciercx_cfg032;
        union cvmx_pciercx_cfg448 pciercx_cfg448;

        /* Set the lane width */
        pciercx_cfg452.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG452(pcie_port));
        pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
        if (pescx_ctl_status.s.qlm_cfg == 0)
                /* We're in 8 lane (56XX) or 4 lane (54XX) mode */
                pciercx_cfg452.s.lme = 0xf;
        else
                /* We're in 4 lane (56XX) or 2 lane (52XX) mode */
                pciercx_cfg452.s.lme = 0x7;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG452(pcie_port), pciercx_cfg452.u32);

        /*
         * CN52XX pass 1.x has an errata where length mismatches on UR
         * responses can cause bus errors on 64bit memory
         * reads. Turning off length error checking fixes this.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
                union cvmx_pciercx_cfg455 pciercx_cfg455;
                pciercx_cfg455.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG455(pcie_port));
                pciercx_cfg455.s.m_cpl_len_err = 1;
                cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG455(pcie_port), pciercx_cfg455.u32);
        }

        /* Lane swap needs to be manually enabled for CN52XX */
        if (OCTEON_IS_MODEL(OCTEON_CN52XX) && (pcie_port == 1)) {
                pescx_ctl_status.s.lane_swp = 1;
                cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);
        }

        /* Bring up the link */
        pescx_ctl_status.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS(pcie_port));
        pescx_ctl_status.s.lnk_enb = 1;
        cvmx_write_csr(CVMX_PESCX_CTL_STATUS(pcie_port), pescx_ctl_status.u64);

        /*
         * CN52XX pass 1.0: Due to a bug in 2nd order CDR, it needs to
         * be disabled.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_0))
                __cvmx_helper_errata_qlm_disable_2nd_order_cdr(0);

        /* Wait for the link to come up */
        start_cycle = cvmx_get_cycle();
        do {
                if (cvmx_get_cycle() - start_cycle > 2 * octeon_get_clock_rate()) {
                        cvmx_dprintf("PCIe: Port %d link timeout\n", pcie_port);
                        return -1;
                }
                cvmx_wait(10000);
                pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
        } while (pciercx_cfg032.s.dlla == 0);

        /* Clear all pending errors */
        cvmx_write_csr(CVMX_PEXP_NPEI_INT_SUM, cvmx_read_csr(CVMX_PEXP_NPEI_INT_SUM));

        /*
         * Update the Replay Time Limit. Empirically, some PCIe
         * devices take a little longer to respond than expected under
         * load. As a workaround for this we configure the Replay Time
         * Limit to the value expected for a 512 byte MPS instead of
         * our actual 256 byte MPS. The numbers below are directly
         * from the PCIe spec table 3-4.
         */
        pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
        switch (pciercx_cfg032.s.nlw) {
        case 1:         /* 1 lane */
                pciercx_cfg448.s.rtl = 1677;
                break;
        case 2:         /* 2 lanes */
                pciercx_cfg448.s.rtl = 867;
                break;
        case 4:         /* 4 lanes */
                pciercx_cfg448.s.rtl = 462;
                break;
        case 8:         /* 8 lanes */
                pciercx_cfg448.s.rtl = 258;
                break;
        }
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);

        return 0;
}

static void __cvmx_increment_ba(union cvmx_sli_mem_access_subidx *pmas)
{
        if (OCTEON_IS_MODEL(OCTEON_CN68XX))
                pmas->cn68xx.ba++;
        else
                pmas->cn63xx.ba++;
}

/**
 * Initialize a PCIe gen 1 port for use in host(RC) mode. It doesn't
 * enumerate the bus.
 *
 * @pcie_port: PCIe port to initialize
 *
 * Returns Zero on success
 */
static int __cvmx_pcie_rc_initialize_gen1(int pcie_port)
{
        int i;
        int base;
        u64 addr_swizzle;
        union cvmx_ciu_soft_prst ciu_soft_prst;
        union cvmx_pescx_bist_status pescx_bist_status;
        union cvmx_pescx_bist_status2 pescx_bist_status2;
        union cvmx_npei_ctl_status npei_ctl_status;
        union cvmx_npei_mem_access_ctl npei_mem_access_ctl;
        union cvmx_npei_mem_access_subidx mem_access_subid;
        union cvmx_npei_dbg_data npei_dbg_data;
        union cvmx_pescx_ctl_status2 pescx_ctl_status2;
        union cvmx_pciercx_cfg032 pciercx_cfg032;
        union cvmx_npei_bar1_indexx bar1_index;

retry:
        /*
         * Make sure we aren't trying to setup a target mode interface
         * in host mode.
         */
        npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
        if ((pcie_port == 0) && !npei_ctl_status.s.host_mode) {
                cvmx_dprintf("PCIe: Port %d in endpoint mode\n", pcie_port);
                return -1;
        }

        /*
         * Make sure a CN52XX isn't trying to bring up port 1 when it
         * is disabled.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
                npei_dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
                if ((pcie_port == 1) && npei_dbg_data.cn52xx.qlm0_link_width) {
                        cvmx_dprintf("PCIe: ERROR: cvmx_pcie_rc_initialize() called on port1, but port1 is disabled\n");
                        return -1;
                }
        }

        /*
         * PCIe switch arbitration mode. '0' == fixed priority NPEI,
         * PCIe0, then PCIe1. '1' == round robin.
         */
        npei_ctl_status.s.arb = 1;
        /* Allow up to 0x20 config retries */
        npei_ctl_status.s.cfg_rtry = 0x20;
        /*
         * CN52XX pass1.x has an errata where P0_NTAGS and P1_NTAGS
         * don't reset.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
                npei_ctl_status.s.p0_ntags = 0x20;
                npei_ctl_status.s.p1_ntags = 0x20;
        }
        cvmx_write_csr(CVMX_PEXP_NPEI_CTL_STATUS, npei_ctl_status.u64);

        /* Bring the PCIe out of reset */
        if (cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) {
                /*
                 * The EBH5200 board swapped the PCIe reset lines on
                 * the board. As a workaround for this bug, we bring
                 * both PCIe ports out of reset at the same time
                 * instead of on separate calls. So for port 0, we
                 * bring both out of reset and do nothing on port 1
                 */
                if (pcie_port == 0) {
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
                        /*
                         * After a chip reset the PCIe will also be in
                         * reset. If it isn't, most likely someone is
                         * trying to init it again without a proper
                         * PCIe reset.
                         */
                        if (ciu_soft_prst.s.soft_prst == 0) {
                                /* Reset the ports */
                                ciu_soft_prst.s.soft_prst = 1;
                                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
                                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
                                ciu_soft_prst.s.soft_prst = 1;
                                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
                                /* Wait until pcie resets the ports. */
                                udelay(2000);
                        }
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
                        ciu_soft_prst.s.soft_prst = 0;
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
                        ciu_soft_prst.s.soft_prst = 0;
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
                }
        } else {
                /*
                 * The normal case: The PCIe ports are completely
                 * separate and can be brought out of reset
                 * independently.
                 */
                if (pcie_port)
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
                else
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
                /*
                 * After a chip reset the PCIe will also be in
                 * reset. If it isn't, most likely someone is trying
                 * to init it again without a proper PCIe reset.
                 */
                if (ciu_soft_prst.s.soft_prst == 0) {
                        /* Reset the port */
                        ciu_soft_prst.s.soft_prst = 1;
                        if (pcie_port)
                                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
                        else
                                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
                        /* Wait until pcie resets the ports. */
                        udelay(2000);
                }
                if (pcie_port) {
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
                        ciu_soft_prst.s.soft_prst = 0;
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
                } else {
                        ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
                        ciu_soft_prst.s.soft_prst = 0;
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
                }
        }

        /*
         * Wait for PCIe reset to complete. Due to errata PCIE-700, we
         * don't poll PESCX_CTL_STATUS2[PCIERST], but simply wait a
         * fixed number of cycles.
         */
        cvmx_wait(400000);

        /*
         * PESCX_BIST_STATUS2[PCLK_RUN] was missing on pass 1 of
         * CN56XX and CN52XX, so we only probe it on newer chips
         */
        if (!OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) && !OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
                /* Clear PCLK_RUN so we can check if the clock is running */
                pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
                pescx_ctl_status2.s.pclk_run = 1;
                cvmx_write_csr(CVMX_PESCX_CTL_STATUS2(pcie_port), pescx_ctl_status2.u64);
                /* Now that we cleared PCLK_RUN, wait for it to be set
                 * again telling us the clock is running
                 */
                if (CVMX_WAIT_FOR_FIELD64(CVMX_PESCX_CTL_STATUS2(pcie_port),
                                          union cvmx_pescx_ctl_status2, pclk_run, ==, 1, 10000)) {
                        cvmx_dprintf("PCIe: Port %d isn't clocked, skipping.\n", pcie_port);
                        return -1;
                }
        }

        /*
         * Check and make sure PCIe came out of reset. If it doesn't
         * the board probably hasn't wired the clocks up and the
         * interface should be skipped.
         */
        pescx_ctl_status2.u64 = cvmx_read_csr(CVMX_PESCX_CTL_STATUS2(pcie_port));
        if (pescx_ctl_status2.s.pcierst) {
                cvmx_dprintf("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
                return -1;
        }

        /*
         * Check BIST2 status. If any bits are set skip this
         * interface. This is an attempt to catch PCIE-813 on pass 1
         * parts.
         */
        pescx_bist_status2.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS2(pcie_port));
        if (pescx_bist_status2.u64) {
                cvmx_dprintf("PCIe: Port %d BIST2 failed. Most likely this port isn't hooked up, skipping.\n",
                             pcie_port);
                return -1;
        }

        /* Check BIST status */
        pescx_bist_status.u64 = cvmx_read_csr(CVMX_PESCX_BIST_STATUS(pcie_port));
        if (pescx_bist_status.u64)
                cvmx_dprintf("PCIe: BIST FAILED for port %d (0x%016llx)\n",
                             pcie_port, CAST64(pescx_bist_status.u64));

        /* Initialize the config space CSRs */
        __cvmx_pcie_rc_initialize_config_space(pcie_port);

        /* Bring the link up */
        if (__cvmx_pcie_rc_initialize_link_gen1(pcie_port)) {
                cvmx_dprintf("PCIe: Failed to initialize port %d, probably the slot is empty\n",
                             pcie_port);
                return -1;
        }

        /* Store merge control (NPEI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
        npei_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL);
        npei_mem_access_ctl.s.max_word = 0;     /* Allow 16 words to combine */
        npei_mem_access_ctl.s.timer = 127;      /* Wait up to 127 cycles for more data */
        cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_CTL, npei_mem_access_ctl.u64);

        /* Setup Mem access SubDIDs */
        mem_access_subid.u64 = 0;
        mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
        mem_access_subid.s.nmerge = 1;  /* Due to an errata on pass 1 chips, no merging is allowed. */
        mem_access_subid.s.esr = 1;     /* Endian-swap for Reads. */
        mem_access_subid.s.esw = 1;     /* Endian-swap for Writes. */
        mem_access_subid.s.nsr = 0;     /* Enable Snooping for Reads. Octeon doesn't care, but devices might want this more conservative setting */
        mem_access_subid.s.nsw = 0;     /* Enable Snoop for Writes. */
        mem_access_subid.s.ror = 0;     /* Disable Relaxed Ordering for Reads. */
        mem_access_subid.s.row = 0;     /* Disable Relaxed Ordering for Writes. */
        mem_access_subid.s.ba = 0;      /* PCIe Adddress Bits <63:34>. */

        /*
         * Setup mem access 12-15 for port 0, 16-19 for port 1,
         * supplying 36 bits of address space.
         */
        for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
                cvmx_write_csr(CVMX_PEXP_NPEI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
                mem_access_subid.s.ba += 1; /* Set each SUBID to extend the addressable range */
        }

        /*
         * Disable the peer to peer forwarding register. This must be
         * setup by the OS after it enumerates the bus and assigns
         * addresses to the PCIe busses.
         */
        for (i = 0; i < 4; i++) {
                cvmx_write_csr(CVMX_PESCX_P2P_BARX_START(i, pcie_port), -1);
                cvmx_write_csr(CVMX_PESCX_P2P_BARX_END(i, pcie_port), -1);
        }

        /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
        cvmx_write_csr(CVMX_PESCX_P2N_BAR0_START(pcie_port), 0);

        /* BAR1 follows BAR2 with a gap so it has the same address as for gen2. */
        cvmx_write_csr(CVMX_PESCX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);

        bar1_index.u32 = 0;
        bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
        bar1_index.s.ca = 1;       /* Not Cached */
        bar1_index.s.end_swp = 1;  /* Endian Swap mode */
        bar1_index.s.addr_v = 1;   /* Valid entry */

        base = pcie_port ? 16 : 0;

        /* Big endian swizzle for 32-bit PEXP_NCB register. */
#ifdef __MIPSEB__
        addr_swizzle = 4;
#else
        addr_swizzle = 0;
#endif
        for (i = 0; i < 16; i++) {
                cvmx_write64_uint32((CVMX_PEXP_NPEI_BAR1_INDEXX(base) ^ addr_swizzle),
                                    bar1_index.u32);
                base++;
                /* 256MB / 16 >> 22 == 4 */
                bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
        }

        /*
         * Set Octeon's BAR2 to decode 0-2^39. Bar0 and Bar1 take
         * precedence where they overlap. It also overlaps with the
         * device addresses, so make sure the peer to peer forwarding
         * is set right.
         */
        cvmx_write_csr(CVMX_PESCX_P2N_BAR2_START(pcie_port), 0);

        /*
         * Setup BAR2 attributes
         *
         * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
         * - PTLP_RO,CTLP_RO should normally be set (except for debug).
         * - WAIT_COM=0 will likely work for all applications.
         *
         * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM]).
         */
        if (pcie_port) {
                union cvmx_npei_ctl_port1 npei_ctl_port;
                npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT1);
                npei_ctl_port.s.bar2_enb = 1;
                npei_ctl_port.s.bar2_esx = 1;
                npei_ctl_port.s.bar2_cax = 0;
                npei_ctl_port.s.ptlp_ro = 1;
                npei_ctl_port.s.ctlp_ro = 1;
                npei_ctl_port.s.wait_com = 0;
                npei_ctl_port.s.waitl_com = 0;
                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT1, npei_ctl_port.u64);
        } else {
                union cvmx_npei_ctl_port0 npei_ctl_port;
                npei_ctl_port.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_PORT0);
                npei_ctl_port.s.bar2_enb = 1;
                npei_ctl_port.s.bar2_esx = 1;
                npei_ctl_port.s.bar2_cax = 0;
                npei_ctl_port.s.ptlp_ro = 1;
                npei_ctl_port.s.ctlp_ro = 1;
                npei_ctl_port.s.wait_com = 0;
                npei_ctl_port.s.waitl_com = 0;
                cvmx_write_csr(CVMX_PEXP_NPEI_CTL_PORT0, npei_ctl_port.u64);
        }

        /*
         * Both pass 1 and pass 2 of CN52XX and CN56XX have an errata
         * that causes TLP ordering to not be preserved after multiple
         * PCIe port resets. This code detects this fault and corrects
         * it by aligning the TLP counters properly. Another link
         * reset is then performed. See PCIE-13340
         */
        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS2_X) ||
            OCTEON_IS_MODEL(OCTEON_CN52XX_PASS2_X) ||
            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X) ||
            OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X)) {
                union cvmx_npei_dbg_data dbg_data;
                int old_in_fif_p_count;
                int in_fif_p_count;
                int out_p_count;
                int in_p_offset = (OCTEON_IS_MODEL(OCTEON_CN52XX_PASS1_X) || OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_X)) ? 4 : 1;
                int i;

                /*
                 * Choose a write address of 1MB. It should be
                 * harmless as all bars haven't been setup.
                 */
                uint64_t write_address = (cvmx_pcie_get_mem_base_address(pcie_port) + 0x100000) | (1ull<<63);

                /*
                 * Make sure at least in_p_offset have been executed before we try and
                 * read in_fif_p_count
                 */
                i = in_p_offset;
                while (i--) {
                        cvmx_write64_uint32(write_address, 0);
                        cvmx_wait(10000);
                }

                /*
                 * Read the IN_FIF_P_COUNT from the debug
                 * select. IN_FIF_P_COUNT can be unstable sometimes so
                 * read it twice with a write between the reads.  This
                 * way we can tell the value is good as it will
                 * increment by one due to the write
                 */
                cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd7fc : 0xcffc);
                cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
                do {
                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
                        old_in_fif_p_count = dbg_data.s.data & 0xff;
                        cvmx_write64_uint32(write_address, 0);
                        cvmx_wait(10000);
                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
                        in_fif_p_count = dbg_data.s.data & 0xff;
                } while (in_fif_p_count != ((old_in_fif_p_count+1) & 0xff));

                /* Update in_fif_p_count for it's offset with respect to out_p_count */
                in_fif_p_count = (in_fif_p_count + in_p_offset) & 0xff;

                /* Read the OUT_P_COUNT from the debug select */
                cvmx_write_csr(CVMX_PEXP_NPEI_DBG_SELECT, (pcie_port) ? 0xd00f : 0xc80f);
                cvmx_read_csr(CVMX_PEXP_NPEI_DBG_SELECT);
                dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
                out_p_count = (dbg_data.s.data>>1) & 0xff;

                /* Check that the two counters are aligned */
                if (out_p_count != in_fif_p_count) {
                        cvmx_dprintf("PCIe: Port %d aligning TLP counters as workaround to maintain ordering\n", pcie_port);
                        while (in_fif_p_count != 0) {
                                cvmx_write64_uint32(write_address, 0);
                                cvmx_wait(10000);
                                in_fif_p_count = (in_fif_p_count + 1) & 0xff;
                        }
                        /*
                         * The EBH5200 board swapped the PCIe reset
                         * lines on the board. This means we must
                         * bring both links down and up, which will
                         * cause the PCIe0 to need alignment
                         * again. Lots of messages will be displayed,
                         * but everything should work
                         */
                        if ((cvmx_sysinfo_get()->board_type == CVMX_BOARD_TYPE_EBH5200) &&
                                (pcie_port == 1))
                                cvmx_pcie_rc_initialize(0);
                        /* Rety bringing this port up */
                        goto retry;
                }
        }

        /* Display the link status */
        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
        cvmx_dprintf("PCIe: Port %d link active, %d lanes\n", pcie_port, pciercx_cfg032.s.nlw);

        return 0;
}

/**
  * Initialize a host mode PCIe gen 2 link. This function takes a PCIe
 * port from reset to a link up state. Software can then begin
 * configuring the rest of the link.
 *
 * @pcie_port: PCIe port to initialize
 *
 * Return Zero on success.
 */
static int __cvmx_pcie_rc_initialize_link_gen2(int pcie_port)
{
        uint64_t start_cycle;
        union cvmx_pemx_ctl_status pem_ctl_status;
        union cvmx_pciercx_cfg032 pciercx_cfg032;
        union cvmx_pciercx_cfg448 pciercx_cfg448;

        /* Bring up the link */
        pem_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
        pem_ctl_status.s.lnk_enb = 1;
        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pem_ctl_status.u64);

        /* Wait for the link to come up */
        start_cycle = cvmx_get_cycle();
        do {
                if (cvmx_get_cycle() - start_cycle >  octeon_get_clock_rate())
                        return -1;
                cvmx_wait(10000);
                pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
        } while ((pciercx_cfg032.s.dlla == 0) || (pciercx_cfg032.s.lt == 1));

        /*
         * Update the Replay Time Limit. Empirically, some PCIe
         * devices take a little longer to respond than expected under
         * load. As a workaround for this we configure the Replay Time
         * Limit to the value expected for a 512 byte MPS instead of
         * our actual 256 byte MPS. The numbers below are directly
         * from the PCIe spec table 3-4
         */
        pciercx_cfg448.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG448(pcie_port));
        switch (pciercx_cfg032.s.nlw) {
        case 1: /* 1 lane */
                pciercx_cfg448.s.rtl = 1677;
                break;
        case 2: /* 2 lanes */
                pciercx_cfg448.s.rtl = 867;
                break;
        case 4: /* 4 lanes */
                pciercx_cfg448.s.rtl = 462;
                break;
        case 8: /* 8 lanes */
                pciercx_cfg448.s.rtl = 258;
                break;
        }
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG448(pcie_port), pciercx_cfg448.u32);

        return 0;
}


/**
 * Initialize a PCIe gen 2 port for use in host(RC) mode. It doesn't enumerate
 * the bus.
 *
 * @pcie_port: PCIe port to initialize
 *
 * Returns Zero on success.
 */
static int __cvmx_pcie_rc_initialize_gen2(int pcie_port)
{
        int i;
        union cvmx_ciu_soft_prst ciu_soft_prst;
        union cvmx_mio_rst_ctlx mio_rst_ctl;
        union cvmx_pemx_bar_ctl pemx_bar_ctl;
        union cvmx_pemx_ctl_status pemx_ctl_status;
        union cvmx_pemx_bist_status pemx_bist_status;
        union cvmx_pemx_bist_status2 pemx_bist_status2;
        union cvmx_pciercx_cfg032 pciercx_cfg032;
        union cvmx_pciercx_cfg515 pciercx_cfg515;
        union cvmx_sli_ctl_portx sli_ctl_portx;
        union cvmx_sli_mem_access_ctl sli_mem_access_ctl;
        union cvmx_sli_mem_access_subidx mem_access_subid;
        union cvmx_sriox_status_reg sriox_status_reg;
        union cvmx_pemx_bar1_indexx bar1_index;

        if (octeon_has_feature(OCTEON_FEATURE_SRIO)) {
                /* Make sure this interface isn't SRIO */
                if (OCTEON_IS_MODEL(OCTEON_CN66XX)) {
                        /*
                         * The CN66XX requires reading the
                         * MIO_QLMX_CFG register to figure out the
                         * port type.
                         */
                        union cvmx_mio_qlmx_cfg qlmx_cfg;
                        qlmx_cfg.u64 = cvmx_read_csr(CVMX_MIO_QLMX_CFG(pcie_port));

                        if (qlmx_cfg.s.qlm_spd == 15) {
                                pr_notice("PCIe: Port %d is disabled, skipping.\n", pcie_port);
                                return -1;
                        }

                        switch (qlmx_cfg.s.qlm_spd) {
                        case 0x1: /* SRIO 1x4 short */
                        case 0x3: /* SRIO 1x4 long */
                        case 0x4: /* SRIO 2x2 short */
                        case 0x6: /* SRIO 2x2 long */
                                pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
                                return -1;
                        case 0x9: /* SGMII */
                                pr_notice("PCIe: Port %d is SGMII, skipping.\n", pcie_port);
                                return -1;
                        case 0xb: /* XAUI */
                                pr_notice("PCIe: Port %d is XAUI, skipping.\n", pcie_port);
                                return -1;
                        case 0x0: /* PCIE gen2 */
                        case 0x8: /* PCIE gen2 (alias) */
                        case 0x2: /* PCIE gen1 */
                        case 0xa: /* PCIE gen1 (alias) */
                                break;
                        default:
                                pr_notice("PCIe: Port %d is unknown, skipping.\n", pcie_port);
                                return -1;
                        }
                } else {
                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(pcie_port));
                        if (sriox_status_reg.s.srio) {
                                pr_notice("PCIe: Port %d is SRIO, skipping.\n", pcie_port);
                                return -1;
                        }
                }
        }

#if 0
    /* This code is so that the PCIe analyzer is able to see 63XX traffic */
        pr_notice("PCIE : init for pcie analyzer.\n");
        cvmx_helper_qlm_jtag_init();
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 85);
        cvmx_helper_qlm_jtag_shift(pcie_port, 1, 1);
        cvmx_helper_qlm_jtag_shift_zeros(pcie_port, 300-86);
        cvmx_helper_qlm_jtag_update(pcie_port);
#endif

        /* Make sure we aren't trying to setup a target mode interface in host mode */
        mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(pcie_port));
        if (!mio_rst_ctl.s.host_mode) {
                pr_notice("PCIe: Port %d in endpoint mode.\n", pcie_port);
                return -1;
        }

        /* CN63XX Pass 1.0 errata G-14395 requires the QLM De-emphasis be programmed */
        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_0)) {
                if (pcie_port) {
                        union cvmx_ciu_qlm1 ciu_qlm;
                        ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM1);
                        ciu_qlm.s.txbypass = 1;
                        ciu_qlm.s.txdeemph = 5;
                        ciu_qlm.s.txmargin = 0x17;
                        cvmx_write_csr(CVMX_CIU_QLM1, ciu_qlm.u64);
                } else {
                        union cvmx_ciu_qlm0 ciu_qlm;
                        ciu_qlm.u64 = cvmx_read_csr(CVMX_CIU_QLM0);
                        ciu_qlm.s.txbypass = 1;
                        ciu_qlm.s.txdeemph = 5;
                        ciu_qlm.s.txmargin = 0x17;
                        cvmx_write_csr(CVMX_CIU_QLM0, ciu_qlm.u64);
                }
        }
        /* Bring the PCIe out of reset */
        if (pcie_port)
                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
        else
                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
        /*
         * After a chip reset the PCIe will also be in reset. If it
         * isn't, most likely someone is trying to init it again
         * without a proper PCIe reset
         */
        if (ciu_soft_prst.s.soft_prst == 0) {
                /* Reset the port */
                ciu_soft_prst.s.soft_prst = 1;
                if (pcie_port)
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
                else
                        cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
                /* Wait until pcie resets the ports. */
                udelay(2000);
        }
        if (pcie_port) {
                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST1);
                ciu_soft_prst.s.soft_prst = 0;
                cvmx_write_csr(CVMX_CIU_SOFT_PRST1, ciu_soft_prst.u64);
        } else {
                ciu_soft_prst.u64 = cvmx_read_csr(CVMX_CIU_SOFT_PRST);
                ciu_soft_prst.s.soft_prst = 0;
                cvmx_write_csr(CVMX_CIU_SOFT_PRST, ciu_soft_prst.u64);
        }

        /* Wait for PCIe reset to complete */
        udelay(1000);

        /*
         * Check and make sure PCIe came out of reset. If it doesn't
         * the board probably hasn't wired the clocks up and the
         * interface should be skipped.
         */
        if (CVMX_WAIT_FOR_FIELD64(CVMX_MIO_RST_CTLX(pcie_port), union cvmx_mio_rst_ctlx, rst_done, ==, 1, 10000)) {
                pr_notice("PCIe: Port %d stuck in reset, skipping.\n", pcie_port);
                return -1;
        }

        /* Check BIST status */
        pemx_bist_status.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS(pcie_port));
        if (pemx_bist_status.u64)
                pr_notice("PCIe: BIST FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status.u64));
        pemx_bist_status2.u64 = cvmx_read_csr(CVMX_PEMX_BIST_STATUS2(pcie_port));
        /* Errata PCIE-14766 may cause the lower 6 bits to be randomly set on CN63XXp1 */
        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X))
                pemx_bist_status2.u64 &= ~0x3full;
        if (pemx_bist_status2.u64)
                pr_notice("PCIe: BIST2 FAILED for port %d (0x%016llx)\n", pcie_port, CAST64(pemx_bist_status2.u64));

        /* Initialize the config space CSRs */
        __cvmx_pcie_rc_initialize_config_space(pcie_port);

        /* Enable gen2 speed selection */
        pciercx_cfg515.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG515(pcie_port));
        pciercx_cfg515.s.dsc = 1;
        cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG515(pcie_port), pciercx_cfg515.u32);

        /* Bring the link up */
        if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
                /*
                 * Some gen1 devices don't handle the gen 2 training
                 * correctly. Disable gen2 and try again with only
                 * gen1
                 */
                union cvmx_pciercx_cfg031 pciercx_cfg031;
                pciercx_cfg031.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG031(pcie_port));
                pciercx_cfg031.s.mls = 1;
                cvmx_pcie_cfgx_write(pcie_port, CVMX_PCIERCX_CFG031(pcie_port), pciercx_cfg031.u32);
                if (__cvmx_pcie_rc_initialize_link_gen2(pcie_port)) {
                        pr_notice("PCIe: Link timeout on port %d, probably the slot is empty\n", pcie_port);
                        return -1;
                }
        }

        /* Store merge control (SLI_MEM_ACCESS_CTL[TIMER,MAX_WORD]) */
        sli_mem_access_ctl.u64 = cvmx_read_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL);
        sli_mem_access_ctl.s.max_word = 0;      /* Allow 16 words to combine */
        sli_mem_access_ctl.s.timer = 127;       /* Wait up to 127 cycles for more data */
        cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_CTL, sli_mem_access_ctl.u64);

        /* Setup Mem access SubDIDs */
        mem_access_subid.u64 = 0;
        mem_access_subid.s.port = pcie_port; /* Port the request is sent to. */
        mem_access_subid.s.nmerge = 0;  /* Allow merging as it works on CN6XXX. */
        mem_access_subid.s.esr = 1;     /* Endian-swap for Reads. */
        mem_access_subid.s.esw = 1;     /* Endian-swap for Writes. */
        mem_access_subid.s.wtype = 0;   /* "No snoop" and "Relaxed ordering" are not set */
        mem_access_subid.s.rtype = 0;   /* "No snoop" and "Relaxed ordering" are not set */
        /* PCIe Adddress Bits <63:34>. */
        if (OCTEON_IS_MODEL(OCTEON_CN68XX))
                mem_access_subid.cn68xx.ba = 0;
        else
                mem_access_subid.cn63xx.ba = 0;

        /*
         * Setup mem access 12-15 for port 0, 16-19 for port 1,
         * supplying 36 bits of address space.
         */
        for (i = 12 + pcie_port * 4; i < 16 + pcie_port * 4; i++) {
                cvmx_write_csr(CVMX_PEXP_SLI_MEM_ACCESS_SUBIDX(i), mem_access_subid.u64);
                /* Set each SUBID to extend the addressable range */
                __cvmx_increment_ba(&mem_access_subid);
        }

        /*
         * Disable the peer to peer forwarding register. This must be
         * setup by the OS after it enumerates the bus and assigns
         * addresses to the PCIe busses.
         */
        for (i = 0; i < 4; i++) {
                cvmx_write_csr(CVMX_PEMX_P2P_BARX_START(i, pcie_port), -1);
                cvmx_write_csr(CVMX_PEMX_P2P_BARX_END(i, pcie_port), -1);
        }

        /* Set Octeon's BAR0 to decode 0-16KB. It overlaps with Bar2 */
        cvmx_write_csr(CVMX_PEMX_P2N_BAR0_START(pcie_port), 0);

        /*
         * Set Octeon's BAR2 to decode 0-2^41. Bar0 and Bar1 take
         * precedence where they overlap. It also overlaps with the
         * device addresses, so make sure the peer to peer forwarding
         * is set right.
         */
        cvmx_write_csr(CVMX_PEMX_P2N_BAR2_START(pcie_port), 0);

        /*
         * Setup BAR2 attributes
         * Relaxed Ordering (NPEI_CTL_PORTn[PTLP_RO,CTLP_RO, WAIT_COM])
         * - PTLP_RO,CTLP_RO should normally be set (except for debug).
         * - WAIT_COM=0 will likely work for all applications.
         * Load completion relaxed ordering (NPEI_CTL_PORTn[WAITL_COM])
         */
        pemx_bar_ctl.u64 = cvmx_read_csr(CVMX_PEMX_BAR_CTL(pcie_port));
        pemx_bar_ctl.s.bar1_siz = 3;  /* 256MB BAR1*/
        pemx_bar_ctl.s.bar2_enb = 1;
        pemx_bar_ctl.s.bar2_esx = 1;
        pemx_bar_ctl.s.bar2_cax = 0;
        cvmx_write_csr(CVMX_PEMX_BAR_CTL(pcie_port), pemx_bar_ctl.u64);
        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port));
        sli_ctl_portx.s.ptlp_ro = 1;
        sli_ctl_portx.s.ctlp_ro = 1;
        sli_ctl_portx.s.wait_com = 0;
        sli_ctl_portx.s.waitl_com = 0;
        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(pcie_port), sli_ctl_portx.u64);

        /* BAR1 follows BAR2 */
        cvmx_write_csr(CVMX_PEMX_P2N_BAR1_START(pcie_port), CVMX_PCIE_BAR1_RC_BASE);

        bar1_index.u64 = 0;
        bar1_index.s.addr_idx = (CVMX_PCIE_BAR1_PHYS_BASE >> 22);
        bar1_index.s.ca = 1;       /* Not Cached */
        bar1_index.s.end_swp = 1;  /* Endian Swap mode */
        bar1_index.s.addr_v = 1;   /* Valid entry */

        for (i = 0; i < 16; i++) {
                cvmx_write_csr(CVMX_PEMX_BAR1_INDEXX(i, pcie_port), bar1_index.u64);
                /* 256MB / 16 >> 22 == 4 */
                bar1_index.s.addr_idx += (((1ull << 28) / 16ull) >> 22);
        }

        /*
         * Allow config retries for 250ms. Count is based off the 5Ghz
         * SERDES clock.
         */
        pemx_ctl_status.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(pcie_port));
        pemx_ctl_status.s.cfg_rtry = 250 * 5000000 / 0x10000;
        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(pcie_port), pemx_ctl_status.u64);

        /* Display the link status */
        pciercx_cfg032.u32 = cvmx_pcie_cfgx_read(pcie_port, CVMX_PCIERCX_CFG032(pcie_port));
        pr_notice("PCIe: Port %d link active, %d lanes, speed gen%d\n", pcie_port, pciercx_cfg032.s.nlw, pciercx_cfg032.s.ls);

        return 0;
}

/**
 * Initialize a PCIe port for use in host(RC) mode. It doesn't enumerate the bus.
 *
 * @pcie_port: PCIe port to initialize
 *
 * Returns Zero on success
 */
static int cvmx_pcie_rc_initialize(int pcie_port)
{
        int result;
        if (octeon_has_feature(OCTEON_FEATURE_NPEI))
                result = __cvmx_pcie_rc_initialize_gen1(pcie_port);
        else
                result = __cvmx_pcie_rc_initialize_gen2(pcie_port);
        return result;
}

/* Above was cvmx-pcie.c, below original pcie.c */

/**
 * Map a PCI device to the appropriate interrupt line
 *
 * @dev:    The Linux PCI device structure for the device to map
 * @slot:   The slot number for this device on __BUS 0__. Linux
 *               enumerates through all the bridges and figures out the
 *               slot on Bus 0 where this device eventually hooks to.
 * @pin:    The PCI interrupt pin read from the device, then swizzled
 *               as it goes through each bridge.
 * Returns Interrupt number for the device
 */
int __init octeon_pcie_pcibios_map_irq(const struct pci_dev *dev,
                                       u8 slot, u8 pin)
{
        /*
         * The EBH5600 board with the PCI to PCIe bridge mistakenly
         * wires the first slot for both device id 2 and interrupt
         * A. According to the PCI spec, device id 2 should be C. The
         * following kludge attempts to fix this.
         */
        if (strstr(octeon_board_type_string(), "EBH5600") &&
            dev->bus && dev->bus->parent) {
                /*
                 * Iterate all the way up the device chain and find
                 * the root bus.
                 */
                while (dev->bus && dev->bus->parent)
                        dev = to_pci_dev(dev->bus->bridge);
                /*
                 * If the root bus is number 0 and the PEX 8114 is the
                 * root, assume we are behind the miswired bus. We
                 * need to correct the swizzle level by two. Yuck.
                 */
                if ((dev->bus->number == 1) &&
                    (dev->vendor == 0x10b5) && (dev->device == 0x8114)) {
                        /*
                         * The pin field is one based, not zero. We
                         * need to swizzle it by minus two.
                         */
                        pin = ((pin - 3) & 3) + 1;
                }
        }
        /*
         * The -1 is because pin starts with one, not zero. It might
         * be that this equation needs to include the slot number, but
         * I don't have hardware to check that against.
         */
        return pin - 1 + OCTEON_IRQ_PCI_INT0;
}

static  void set_cfg_read_retry(u32 retry_cnt)
{
        union cvmx_pemx_ctl_status pemx_ctl;
        pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
        pemx_ctl.s.cfg_rtry = retry_cnt;
        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
}


static u32 disable_cfg_read_retry(void)
{
        u32 retry_cnt;

        union cvmx_pemx_ctl_status pemx_ctl;
        pemx_ctl.u64 = cvmx_read_csr(CVMX_PEMX_CTL_STATUS(1));
        retry_cnt =  pemx_ctl.s.cfg_rtry;
        pemx_ctl.s.cfg_rtry = 0;
        cvmx_write_csr(CVMX_PEMX_CTL_STATUS(1), pemx_ctl.u64);
        return retry_cnt;
}

static int is_cfg_retry(void)
{
        union cvmx_pemx_int_sum pemx_int_sum;
        pemx_int_sum.u64 = cvmx_read_csr(CVMX_PEMX_INT_SUM(1));
        if (pemx_int_sum.s.crs_dr)
                return 1;
        return 0;
}

/*
 * Read a value from configuration space
 *
 */
static int octeon_pcie_read_config(unsigned int pcie_port, struct pci_bus *bus,
                                   unsigned int devfn, int reg, int size,
                                   u32 *val)
{
        union octeon_cvmemctl cvmmemctl;
        union octeon_cvmemctl cvmmemctl_save;
        int bus_number = bus->number;
        int cfg_retry = 0;
        int retry_cnt = 0;
        int max_retry_cnt = 10;
        u32 cfg_retry_cnt = 0;

        cvmmemctl_save.u64 = 0;
        BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));
        /*
         * For the top level bus make sure our hardware bus number
         * matches the software one
         */
        if (bus->parent == NULL) {
                if (enable_pcie_bus_num_war[pcie_port])
                        bus_number = 0;
                else {
                        union cvmx_pciercx_cfg006 pciercx_cfg006;
                        pciercx_cfg006.u32 = cvmx_pcie_cfgx_read(pcie_port,
                                             CVMX_PCIERCX_CFG006(pcie_port));
                        if (pciercx_cfg006.s.pbnum != bus_number) {
                                pciercx_cfg006.s.pbnum = bus_number;
                                pciercx_cfg006.s.sbnum = bus_number;
                                pciercx_cfg006.s.subbnum = bus_number;
                                cvmx_pcie_cfgx_write(pcie_port,
                                            CVMX_PCIERCX_CFG006(pcie_port),
                                            pciercx_cfg006.u32);
                        }
                }
        }

        /*
         * PCIe only has a single device connected to Octeon. It is
         * always device ID 0. Don't bother doing reads for other
         * device IDs on the first segment.
         */
        if ((bus->parent == NULL) && (devfn >> 3 != 0))
                return PCIBIOS_FUNC_NOT_SUPPORTED;

        /*
         * The following is a workaround for the CN57XX, CN56XX,
         * CN55XX, and CN54XX errata with PCIe config reads from non
         * existent devices.  These chips will hang the PCIe link if a
         * config read is performed that causes a UR response.
         */
        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1)) {
                /*
                 * For our EBH5600 board, port 0 has a bridge with two
                 * PCI-X slots. We need a new special checks to make
                 * sure we only probe valid stuff.  The PCIe->PCI-X
                 * bridge only respondes to device ID 0, function
                 * 0-1
                 */
                if ((bus->parent == NULL) && (devfn >= 2))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                /*
                 * The PCI-X slots are device ID 2,3. Choose one of
                 * the below "if" blocks based on what is plugged into
                 * the board.
                 */
#if 1
                /* Use this option if you aren't using either slot */
                if (bus_number == 2)
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
                /*
                 * Use this option if you are using the first slot but
                 * not the second.
                 */
                if ((bus_number == 2) && (devfn >> 3 != 2))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
                /*
                 * Use this option if you are using the second slot
                 * but not the first.
                 */
                if ((bus_number == 2) && (devfn >> 3 != 3))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
#elif 0
                /* Use this opion if you are using both slots */
                if ((bus_number == 2) &&
                    !((devfn == (2 << 3)) || (devfn == (3 << 3))))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
#endif

                /* The following #if gives a more complicated example. This is
                   the required checks for running a Nitrox CN16XX-NHBX in the
                   slot of the EBH5600. This card has a PLX PCIe bridge with
                   four Nitrox PLX parts behind it */
#if 0
                /* PLX bridge with 4 ports */
                if ((bus_number == 4) &&
                    !((devfn >> 3 >= 1) && (devfn >> 3 <= 4)))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                /* Nitrox behind PLX 1 */
                if ((bus_number == 5) && (devfn >> 3 != 0))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                /* Nitrox behind PLX 2 */
                if ((bus_number == 6) && (devfn >> 3 != 0))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                /* Nitrox behind PLX 3 */
                if ((bus_number == 7) && (devfn >> 3 != 0))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                /* Nitrox behind PLX 4 */
                if ((bus_number == 8) && (devfn >> 3 != 0))
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
#endif

                /*
                 * Shorten the DID timeout so bus errors for PCIe
                 * config reads from non existent devices happen
                 * faster. This allows us to continue booting even if
                 * the above "if" checks are wrong.  Once one of these
                 * errors happens, the PCIe port is dead.
                 */
                cvmmemctl_save.u64 = __read_64bit_c0_register($11, 7);
                cvmmemctl.u64 = cvmmemctl_save.u64;
                cvmmemctl.s.didtto = 2;
                __write_64bit_c0_register($11, 7, cvmmemctl.u64);
        }

        if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
                cfg_retry_cnt = disable_cfg_read_retry();

        pr_debug("pcie_cfg_rd port=%d b=%d devfn=0x%03x reg=0x%03x"
                 " size=%d ", pcie_port, bus_number, devfn, reg, size);
        do {
                switch (size) {
                case 4:
                        *val = cvmx_pcie_config_read32(pcie_port, bus_number,
                                devfn >> 3, devfn & 0x7, reg);
                break;
                case 2:
                        *val = cvmx_pcie_config_read16(pcie_port, bus_number,
                                devfn >> 3, devfn & 0x7, reg);
                break;
                case 1:
                        *val = cvmx_pcie_config_read8(pcie_port, bus_number,
                                devfn >> 3, devfn & 0x7, reg);
                break;
                default:
                        if (OCTEON_IS_MODEL(OCTEON_CN63XX))
                                set_cfg_read_retry(cfg_retry_cnt);
                        return PCIBIOS_FUNC_NOT_SUPPORTED;
                }
                if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) &&
                        (enable_pcie_14459_war)) {
                        cfg_retry = is_cfg_retry();
                        retry_cnt++;
                        if (retry_cnt > max_retry_cnt) {
                                pr_err(" pcie cfg_read retries failed. retry_cnt=%d\n",
                                       retry_cnt);
                                cfg_retry = 0;
                        }
                }
        } while (cfg_retry);

        if ((OCTEON_IS_MODEL(OCTEON_CN63XX)) && (enable_pcie_14459_war))
                set_cfg_read_retry(cfg_retry_cnt);
        pr_debug("val=%08x  : tries=%02d\n", *val, retry_cnt);
        if (OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1) ||
            OCTEON_IS_MODEL(OCTEON_CN56XX_PASS1_1))
                write_c0_cvmmemctl(cvmmemctl_save.u64);
        return PCIBIOS_SUCCESSFUL;
}

static int octeon_pcie0_read_config(struct pci_bus *bus, unsigned int devfn,
                                    int reg, int size, u32 *val)
{
        return octeon_pcie_read_config(0, bus, devfn, reg, size, val);
}

static int octeon_pcie1_read_config(struct pci_bus *bus, unsigned int devfn,
                                    int reg, int size, u32 *val)
{
        return octeon_pcie_read_config(1, bus, devfn, reg, size, val);
}

static int octeon_dummy_read_config(struct pci_bus *bus, unsigned int devfn,
                                    int reg, int size, u32 *val)
{
        return PCIBIOS_FUNC_NOT_SUPPORTED;
}

/*
 * Write a value to PCI configuration space
 */
static int octeon_pcie_write_config(unsigned int pcie_port, struct pci_bus *bus,
                                    unsigned int devfn, int reg,
                                    int size, u32 val)
{
        int bus_number = bus->number;

        BUG_ON(pcie_port >= ARRAY_SIZE(enable_pcie_bus_num_war));

        if ((bus->parent == NULL) && (enable_pcie_bus_num_war[pcie_port]))
                bus_number = 0;

        pr_debug("pcie_cfg_wr port=%d b=%d devfn=0x%03x"
                 " reg=0x%03x size=%d val=%08x\n", pcie_port, bus_number, devfn,
                 reg, size, val);


        switch (size) {
        case 4:
                cvmx_pcie_config_write32(pcie_port, bus_number, devfn >> 3,
                                         devfn & 0x7, reg, val);
                break;
        case 2:
                cvmx_pcie_config_write16(pcie_port, bus_number, devfn >> 3,
                                         devfn & 0x7, reg, val);
                break;
        case 1:
                cvmx_pcie_config_write8(pcie_port, bus_number, devfn >> 3,
                                        devfn & 0x7, reg, val);
                break;
        default:
                return PCIBIOS_FUNC_NOT_SUPPORTED;
        }
#if PCI_CONFIG_SPACE_DELAY
        /*
         * Delay on writes so that devices have time to come up. Some
         * bridges need this to allow time for the secondary busses to
         * work
         */
        udelay(PCI_CONFIG_SPACE_DELAY);
#endif
        return PCIBIOS_SUCCESSFUL;
}

static int octeon_pcie0_write_config(struct pci_bus *bus, unsigned int devfn,
                                     int reg, int size, u32 val)
{
        return octeon_pcie_write_config(0, bus, devfn, reg, size, val);
}

static int octeon_pcie1_write_config(struct pci_bus *bus, unsigned int devfn,
                                     int reg, int size, u32 val)
{
        return octeon_pcie_write_config(1, bus, devfn, reg, size, val);
}

static int octeon_dummy_write_config(struct pci_bus *bus, unsigned int devfn,
                                     int reg, int size, u32 val)
{
        return PCIBIOS_FUNC_NOT_SUPPORTED;
}

static struct pci_ops octeon_pcie0_ops = {
        octeon_pcie0_read_config,
        octeon_pcie0_write_config,
};

static struct resource octeon_pcie0_mem_resource = {
        .name = "Octeon PCIe0 MEM",
        .flags = IORESOURCE_MEM,
};

static struct resource octeon_pcie0_io_resource = {
        .name = "Octeon PCIe0 IO",
        .flags = IORESOURCE_IO,
};

static struct pci_controller octeon_pcie0_controller = {
        .pci_ops = &octeon_pcie0_ops,
        .mem_resource = &octeon_pcie0_mem_resource,
        .io_resource = &octeon_pcie0_io_resource,
};

static struct pci_ops octeon_pcie1_ops = {
        octeon_pcie1_read_config,
        octeon_pcie1_write_config,
};

static struct resource octeon_pcie1_mem_resource = {
        .name = "Octeon PCIe1 MEM",
        .flags = IORESOURCE_MEM,
};

static struct resource octeon_pcie1_io_resource = {
        .name = "Octeon PCIe1 IO",
        .flags = IORESOURCE_IO,
};

static struct pci_controller octeon_pcie1_controller = {
        .pci_ops = &octeon_pcie1_ops,
        .mem_resource = &octeon_pcie1_mem_resource,
        .io_resource = &octeon_pcie1_io_resource,
};

static struct pci_ops octeon_dummy_ops = {
        octeon_dummy_read_config,
        octeon_dummy_write_config,
};

static struct resource octeon_dummy_mem_resource = {
        .name = "Virtual PCIe MEM",
        .flags = IORESOURCE_MEM,
};

static struct resource octeon_dummy_io_resource = {
        .name = "Virtual PCIe IO",
        .flags = IORESOURCE_IO,
};

static struct pci_controller octeon_dummy_controller = {
        .pci_ops = &octeon_dummy_ops,
        .mem_resource = &octeon_dummy_mem_resource,
        .io_resource = &octeon_dummy_io_resource,
};

static int device_needs_bus_num_war(uint32_t deviceid)
{
#define IDT_VENDOR_ID 0x111d

        if ((deviceid  & 0xffff) == IDT_VENDOR_ID)
                return 1;
        return 0;
}

/**
 * Initialize the Octeon PCIe controllers
 *
 * Returns
 */
static int __init octeon_pcie_setup(void)
{
        int result;
        int host_mode;
        int srio_war15205 = 0, port;
        union cvmx_sli_ctl_portx sli_ctl_portx;
        union cvmx_sriox_status_reg sriox_status_reg;

        /* These chips don't have PCIe */
        if (!octeon_has_feature(OCTEON_FEATURE_PCIE))
                return 0;

        /* No PCIe simulation */
        if (octeon_is_simulation())
                return 0;

        /* Disable PCI if instructed on the command line */
        if (pcie_disable)
                return 0;

        /* Point pcibios_map_irq() to the PCIe version of it */
        octeon_pcibios_map_irq = octeon_pcie_pcibios_map_irq;

        /*
         * PCIe I/O range. It is based on port 0 but includes up until
         * port 1's end.
         */
        set_io_port_base(CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0)));
        ioport_resource.start = 0;
        ioport_resource.end =
                cvmx_pcie_get_io_base_address(1) -
                cvmx_pcie_get_io_base_address(0) + cvmx_pcie_get_io_size(1) - 1;

        /*
         * Create a dummy PCIe controller to swallow up bus 0. IDT bridges
         * don't work if the primary bus number is zero. Here we add a fake
         * PCIe controller that the kernel will give bus 0. This allows
         * us to not change the normal kernel bus enumeration
         */
        octeon_dummy_controller.io_map_base = -1;
        octeon_dummy_controller.mem_resource->start = (1ull<<48);
        octeon_dummy_controller.mem_resource->end = (1ull<<48);
        register_pci_controller(&octeon_dummy_controller);

        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
                union cvmx_npei_ctl_status npei_ctl_status;
                npei_ctl_status.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_CTL_STATUS);
                host_mode = npei_ctl_status.s.host_mode;
                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE;
        } else {
                union cvmx_mio_rst_ctlx mio_rst_ctl;
                mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(0));
                host_mode = mio_rst_ctl.s.host_mode;
                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_PCIE2;
        }

        if (host_mode) {
                pr_notice("PCIe: Initializing port 0\n");
                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(0));
                        if (sriox_status_reg.s.srio) {
                                srio_war15205 += 1;      /* Port is SRIO */
                                port = 0;
                        }
                }
                result = cvmx_pcie_rc_initialize(0);
                if (result == 0) {
                        uint32_t device0;
                        /* Memory offsets are physical addresses */
                        octeon_pcie0_controller.mem_offset =
                                cvmx_pcie_get_mem_base_address(0);
                        /* IO offsets are Mips virtual addresses */
                        octeon_pcie0_controller.io_map_base =
                                CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address
                                                (0));
                        octeon_pcie0_controller.io_offset = 0;
                        /*
                         * To keep things similar to PCI, we start
                         * device addresses at the same place as PCI
                         * uisng big bar support. This normally
                         * translates to 4GB-256MB, which is the same
                         * as most x86 PCs.
                         */
                        octeon_pcie0_controller.mem_resource->start =
                                cvmx_pcie_get_mem_base_address(0) +
                                (4ul << 30) - (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
                        octeon_pcie0_controller.mem_resource->end =
                                cvmx_pcie_get_mem_base_address(0) +
                                cvmx_pcie_get_mem_size(0) - 1;
                        /*
                         * Ports must be above 16KB for the ISA bus
                         * filtering in the PCI-X to PCI bridge.
                         */
                        octeon_pcie0_controller.io_resource->start = 4 << 10;
                        octeon_pcie0_controller.io_resource->end =
                                cvmx_pcie_get_io_size(0) - 1;
                        msleep(100); /* Some devices need extra time */
                        register_pci_controller(&octeon_pcie0_controller);
                        device0 = cvmx_pcie_config_read32(0, 0, 0, 0, 0);
                        enable_pcie_bus_num_war[0] =
                                device_needs_bus_num_war(device0);
                }
        } else {
                pr_notice("PCIe: Port 0 in endpoint mode, skipping.\n");
                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
                        srio_war15205 += 1;
                        port = 0;
                }
        }

        if (octeon_has_feature(OCTEON_FEATURE_NPEI)) {
                host_mode = 1;
                /* Skip the 2nd port on CN52XX if port 0 is in 4 lane mode */
                if (OCTEON_IS_MODEL(OCTEON_CN52XX)) {
                        union cvmx_npei_dbg_data dbg_data;
                        dbg_data.u64 = cvmx_read_csr(CVMX_PEXP_NPEI_DBG_DATA);
                        if (dbg_data.cn52xx.qlm0_link_width)
                                host_mode = 0;
                }
        } else {
                union cvmx_mio_rst_ctlx mio_rst_ctl;
                mio_rst_ctl.u64 = cvmx_read_csr(CVMX_MIO_RST_CTLX(1));
                host_mode = mio_rst_ctl.s.host_mode;
        }

        if (host_mode) {
                pr_notice("PCIe: Initializing port 1\n");
                /* CN63XX pass 1_x/2.0 errata PCIe-15205 */
                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
                        sriox_status_reg.u64 = cvmx_read_csr(CVMX_SRIOX_STATUS_REG(1));
                        if (sriox_status_reg.s.srio) {
                                srio_war15205 += 1;      /* Port is SRIO */
                                port = 1;
                        }
                }
                result = cvmx_pcie_rc_initialize(1);
                if (result == 0) {
                        uint32_t device0;
                        /* Memory offsets are physical addresses */
                        octeon_pcie1_controller.mem_offset =
                                cvmx_pcie_get_mem_base_address(1);
                        /*
                         * To calculate the address for accessing the 2nd PCIe device,
                         * either 'io_map_base' (pci_iomap()), or 'mips_io_port_base'
                         * (ioport_map()) value is added to
                         * pci_resource_start(dev,bar)). The 'mips_io_port_base' is set
                         * only once based on first PCIe. Also changing 'io_map_base'
                         * based on first slot's value so that both the routines will
                         * work properly.
                         */
                        octeon_pcie1_controller.io_map_base =
                                CVMX_ADD_IO_SEG(cvmx_pcie_get_io_base_address(0));
                        /* IO offsets are Mips virtual addresses */
                        octeon_pcie1_controller.io_offset =
                                cvmx_pcie_get_io_base_address(1) -
                                cvmx_pcie_get_io_base_address(0);
                        /*
                         * To keep things similar to PCI, we start device
                         * addresses at the same place as PCI uisng big bar
                         * support. This normally translates to 4GB-256MB,
                         * which is the same as most x86 PCs.
                         */
                        octeon_pcie1_controller.mem_resource->start =
                                cvmx_pcie_get_mem_base_address(1) + (4ul << 30) -
                                (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
                        octeon_pcie1_controller.mem_resource->end =
                                cvmx_pcie_get_mem_base_address(1) +
                                cvmx_pcie_get_mem_size(1) - 1;
                        /*
                         * Ports must be above 16KB for the ISA bus filtering
                         * in the PCI-X to PCI bridge.
                         */
                        octeon_pcie1_controller.io_resource->start =
                                cvmx_pcie_get_io_base_address(1) -
                                cvmx_pcie_get_io_base_address(0);
                        octeon_pcie1_controller.io_resource->end =
                                octeon_pcie1_controller.io_resource->start +
                                cvmx_pcie_get_io_size(1) - 1;
                        msleep(100); /* Some devices need extra time */
                        register_pci_controller(&octeon_pcie1_controller);
                        device0 = cvmx_pcie_config_read32(1, 0, 0, 0, 0);
                        enable_pcie_bus_num_war[1] =
                                device_needs_bus_num_war(device0);
                }
        } else {
                pr_notice("PCIe: Port 1 not in root complex mode, skipping.\n");
                /* CN63XX pass 1_x/2.0 errata PCIe-15205  */
                if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
                        OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
                        srio_war15205 += 1;
                        port = 1;
                }
        }

        /*
         * CN63XX pass 1_x/2.0 errata PCIe-15205 requires setting all
         * of SRIO MACs SLI_CTL_PORT*[INT*_MAP] to similar value and
         * all of PCIe Macs SLI_CTL_PORT*[INT*_MAP] to different value
         * from the previous set values
         */
        if (OCTEON_IS_MODEL(OCTEON_CN63XX_PASS1_X) ||
                OCTEON_IS_MODEL(OCTEON_CN63XX_PASS2_0)) {
                if (srio_war15205 == 1) {
                        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(port));
                        sli_ctl_portx.s.inta_map = 1;
                        sli_ctl_portx.s.intb_map = 1;
                        sli_ctl_portx.s.intc_map = 1;
                        sli_ctl_portx.s.intd_map = 1;
                        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(port), sli_ctl_portx.u64);

                        sli_ctl_portx.u64 = cvmx_read_csr(CVMX_PEXP_SLI_CTL_PORTX(!port));
                        sli_ctl_portx.s.inta_map = 0;
                        sli_ctl_portx.s.intb_map = 0;
                        sli_ctl_portx.s.intc_map = 0;
                        sli_ctl_portx.s.intd_map = 0;
                        cvmx_write_csr(CVMX_PEXP_SLI_CTL_PORTX(!port), sli_ctl_portx.u64);
                }
        }

        octeon_pci_dma_init();

        return 0;
}
arch_initcall(octeon_pcie_setup);