/*
 * 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) 2005-2009 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/swiotlb.h>

#include <asm/time.h>

#include <asm/octeon/octeon.h>
#include <asm/octeon/cvmx-npi-defs.h>
#include <asm/octeon/cvmx-pci-defs.h>
#include <asm/octeon/pci-octeon.h>

#include <dma-coherence.h>

#define USE_OCTEON_INTERNAL_ARBITER

/*
 * Octeon's PCI controller uses did=3, subdid=2 for PCI IO
 * addresses. Use PCI endian swapping 1 so no address swapping is
 * necessary. The Linux io routines will endian swap the data.
 */
#define OCTEON_PCI_IOSPACE_BASE     0x80011a0400000000ull
#define OCTEON_PCI_IOSPACE_SIZE     (1ull<<32)

/* Octeon't PCI controller uses did=3, subdid=3 for PCI memory. */
#define OCTEON_PCI_MEMSPACE_OFFSET  (0x00011b0000000000ull)

u64 octeon_bar1_pci_phys;

/**
 * This is the bit decoding used for the Octeon PCI controller addresses
 */
union octeon_pci_address {
        uint64_t u64;
        struct {
                uint64_t upper:2;
                uint64_t reserved:13;
                uint64_t io:1;
                uint64_t did:5;
                uint64_t subdid:3;
                uint64_t reserved2:4;
                uint64_t endian_swap:2;
                uint64_t reserved3:10;
                uint64_t bus:8;
                uint64_t dev:5;
                uint64_t func:3;
                uint64_t reg:8;
        } s;
};

int __initdata (*octeon_pcibios_map_irq)(const struct pci_dev *dev,
                                         u8 slot, u8 pin);
enum octeon_dma_bar_type octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_INVALID;

/**
 * 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 pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
        if (octeon_pcibios_map_irq)
                return octeon_pcibios_map_irq(dev, slot, pin);
        else
                panic("octeon_pcibios_map_irq not set.");
}


/*
 * Called to perform platform specific PCI setup
 */
int pcibios_plat_dev_init(struct pci_dev *dev)
{
        uint16_t config;
        uint32_t dconfig;
        int pos;
        /*
         * Force the Cache line setting to 64 bytes. The standard
         * Linux bus scan doesn't seem to set it. Octeon really has
         * 128 byte lines, but Intel bridges get really upset if you
         * try and set values above 64 bytes. Value is specified in
         * 32bit words.
         */
        pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, 64 / 4);
        /* Set latency timers for all devices */
        pci_write_config_byte(dev, PCI_LATENCY_TIMER, 48);

        /* Enable reporting System errors and parity errors on all devices */
        /* Enable parity checking and error reporting */
        pci_read_config_word(dev, PCI_COMMAND, &config);
        config |= PCI_COMMAND_PARITY | PCI_COMMAND_SERR;
        pci_write_config_word(dev, PCI_COMMAND, config);

        if (dev->subordinate) {
                /* Set latency timers on sub bridges */
                pci_write_config_byte(dev, PCI_SEC_LATENCY_TIMER, 48);
                /* More bridge error detection */
                pci_read_config_word(dev, PCI_BRIDGE_CONTROL, &config);
                config |= PCI_BRIDGE_CTL_PARITY | PCI_BRIDGE_CTL_SERR;
                pci_write_config_word(dev, PCI_BRIDGE_CONTROL, config);
        }

        /* Enable the PCIe normal error reporting */
        pos = pci_find_capability(dev, PCI_CAP_ID_EXP);
        if (pos) {
                /* Update Device Control */
                pci_read_config_word(dev, pos + PCI_EXP_DEVCTL, &config);
                /* Correctable Error Reporting */
                config |= PCI_EXP_DEVCTL_CERE;
                /* Non-Fatal Error Reporting */
                config |= PCI_EXP_DEVCTL_NFERE;
                /* Fatal Error Reporting */
                config |= PCI_EXP_DEVCTL_FERE;
                /* Unsupported Request */
                config |= PCI_EXP_DEVCTL_URRE;
                pci_write_config_word(dev, pos + PCI_EXP_DEVCTL, config);
        }

        /* Find the Advanced Error Reporting capability */
        pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR);
        if (pos) {
                /* Clear Uncorrectable Error Status */
                pci_read_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
                                      &dconfig);
                pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_STATUS,
                                       dconfig);
                /* Enable reporting of all uncorrectable errors */
                /* Uncorrectable Error Mask - turned on bits disable errors */
                pci_write_config_dword(dev, pos + PCI_ERR_UNCOR_MASK, 0);
                /*
                 * Leave severity at HW default. This only controls if
                 * errors are reported as uncorrectable or
                 * correctable, not if the error is reported.
                 */
                /* PCI_ERR_UNCOR_SEVER - Uncorrectable Error Severity */
                /* Clear Correctable Error Status */
                pci_read_config_dword(dev, pos + PCI_ERR_COR_STATUS, &dconfig);
                pci_write_config_dword(dev, pos + PCI_ERR_COR_STATUS, dconfig);
                /* Enable reporting of all correctable errors */
                /* Correctable Error Mask - turned on bits disable errors */
                pci_write_config_dword(dev, pos + PCI_ERR_COR_MASK, 0);
                /* Advanced Error Capabilities */
                pci_read_config_dword(dev, pos + PCI_ERR_CAP, &dconfig);
                /* ECRC Generation Enable */
                if (config & PCI_ERR_CAP_ECRC_GENC)
                        config |= PCI_ERR_CAP_ECRC_GENE;
                /* ECRC Check Enable */
                if (config & PCI_ERR_CAP_ECRC_CHKC)
                        config |= PCI_ERR_CAP_ECRC_CHKE;
                pci_write_config_dword(dev, pos + PCI_ERR_CAP, dconfig);
                /* PCI_ERR_HEADER_LOG - Header Log Register (16 bytes) */
                /* Report all errors to the root complex */
                pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND,
                                       PCI_ERR_ROOT_CMD_COR_EN |
                                       PCI_ERR_ROOT_CMD_NONFATAL_EN |
                                       PCI_ERR_ROOT_CMD_FATAL_EN);
                /* Clear the Root status register */
                pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &dconfig);
                pci_write_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, dconfig);
        }

        dev->dev.archdata.dma_ops = octeon_pci_dma_map_ops;

        return 0;
}

/**
 * Return the mapping of PCI device number to IRQ line. Each
 * character in the return string represents the interrupt
 * line for the device at that position. Device 1 maps to the
 * first character, etc. The characters A-D are used for PCI
 * interrupts.
 *
 * Returns PCI interrupt mapping
 */
const char *octeon_get_pci_interrupts(void)
{
        /*
         * Returning an empty string causes the interrupts to be
         * routed based on the PCI specification. From the PCI spec:
         *
         * INTA# of Device Number 0 is connected to IRQW on the system
         * board.  (Device Number has no significance regarding being
         * located on the system board or in a connector.) INTA# of
         * Device Number 1 is connected to IRQX on the system
         * board. INTA# of Device Number 2 is connected to IRQY on the
         * system board. INTA# of Device Number 3 is connected to IRQZ
         * on the system board. The table below describes how each
         * agent's INTx# lines are connected to the system board
         * interrupt lines. The following equation can be used to
         * determine to which INTx# signal on the system board a given
         * device's INTx# line(s) is connected.
         *
         * MB = (D + I) MOD 4 MB = System board Interrupt (IRQW = 0,
         * IRQX = 1, IRQY = 2, and IRQZ = 3) D = Device Number I =
         * Interrupt Number (INTA# = 0, INTB# = 1, INTC# = 2, and
         * INTD# = 3)
         */
        switch (octeon_bootinfo->board_type) {
        case CVMX_BOARD_TYPE_NAO38:
                /* This is really the NAC38 */
                return "AAAAADABAAAAAAAAAAAAAAAAAAAAAAAA";
        case CVMX_BOARD_TYPE_EBH3100:
        case CVMX_BOARD_TYPE_CN3010_EVB_HS5:
        case CVMX_BOARD_TYPE_CN3005_EVB_HS5:
                return "AAABAAAAAAAAAAAAAAAAAAAAAAAAAAAA";
        case CVMX_BOARD_TYPE_BBGW_REF:
                return "AABCD";
        case CVMX_BOARD_TYPE_THUNDER:
        case CVMX_BOARD_TYPE_EBH3000:
        default:
                return "";
        }
}

/**
 * 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_pci_pcibios_map_irq(const struct pci_dev *dev,
                                      u8 slot, u8 pin)
{
        int irq_num;
        const char *interrupts;
        int dev_num;

        /* Get the board specific interrupt mapping */
        interrupts = octeon_get_pci_interrupts();

        dev_num = dev->devfn >> 3;
        if (dev_num < strlen(interrupts))
                irq_num = ((interrupts[dev_num] - 'A' + pin - 1) & 3) +
                        OCTEON_IRQ_PCI_INT0;
        else
                irq_num = ((slot + pin - 3) & 3) + OCTEON_IRQ_PCI_INT0;
        return irq_num;
}


/*
 * Read a value from configuration space
 */
static int octeon_read_config(struct pci_bus *bus, unsigned int devfn,
                              int reg, int size, u32 *val)
{
        union octeon_pci_address pci_addr;

        pci_addr.u64 = 0;
        pci_addr.s.upper = 2;
        pci_addr.s.io = 1;
        pci_addr.s.did = 3;
        pci_addr.s.subdid = 1;
        pci_addr.s.endian_swap = 1;
        pci_addr.s.bus = bus->number;
        pci_addr.s.dev = devfn >> 3;
        pci_addr.s.func = devfn & 0x7;
        pci_addr.s.reg = reg;

#if PCI_CONFIG_SPACE_DELAY
        udelay(PCI_CONFIG_SPACE_DELAY);
#endif
        switch (size) {
        case 4:
                *val = le32_to_cpu(cvmx_read64_uint32(pci_addr.u64));
                return PCIBIOS_SUCCESSFUL;
        case 2:
                *val = le16_to_cpu(cvmx_read64_uint16(pci_addr.u64));
                return PCIBIOS_SUCCESSFUL;
        case 1:
                *val = cvmx_read64_uint8(pci_addr.u64);
                return PCIBIOS_SUCCESSFUL;
        }
        return PCIBIOS_FUNC_NOT_SUPPORTED;
}


/*
 * Write a value to PCI configuration space
 */
static int octeon_write_config(struct pci_bus *bus, unsigned int devfn,
                               int reg, int size, u32 val)
{
        union octeon_pci_address pci_addr;

        pci_addr.u64 = 0;
        pci_addr.s.upper = 2;
        pci_addr.s.io = 1;
        pci_addr.s.did = 3;
        pci_addr.s.subdid = 1;
        pci_addr.s.endian_swap = 1;
        pci_addr.s.bus = bus->number;
        pci_addr.s.dev = devfn >> 3;
        pci_addr.s.func = devfn & 0x7;
        pci_addr.s.reg = reg;

#if PCI_CONFIG_SPACE_DELAY
        udelay(PCI_CONFIG_SPACE_DELAY);
#endif
        switch (size) {
        case 4:
                cvmx_write64_uint32(pci_addr.u64, cpu_to_le32(val));
                return PCIBIOS_SUCCESSFUL;
        case 2:
                cvmx_write64_uint16(pci_addr.u64, cpu_to_le16(val));
                return PCIBIOS_SUCCESSFUL;
        case 1:
                cvmx_write64_uint8(pci_addr.u64, val);
                return PCIBIOS_SUCCESSFUL;
        }
        return PCIBIOS_FUNC_NOT_SUPPORTED;
}


static struct pci_ops octeon_pci_ops = {
        octeon_read_config,
        octeon_write_config,
};

static struct resource octeon_pci_mem_resource = {
        .start = 0,
        .end = 0,
        .name = "Octeon PCI MEM",
        .flags = IORESOURCE_MEM,
};

/*
 * PCI ports must be above 16KB so the ISA bus filtering in the PCI-X to PCI
 * bridge
 */
static struct resource octeon_pci_io_resource = {
        .start = 0x4000,
        .end = OCTEON_PCI_IOSPACE_SIZE - 1,
        .name = "Octeon PCI IO",
        .flags = IORESOURCE_IO,
};

static struct pci_controller octeon_pci_controller = {
        .pci_ops = &octeon_pci_ops,
        .mem_resource = &octeon_pci_mem_resource,
        .mem_offset = OCTEON_PCI_MEMSPACE_OFFSET,
        .io_resource = &octeon_pci_io_resource,
        .io_offset = 0,
        .io_map_base = OCTEON_PCI_IOSPACE_BASE,
};


/*
 * Low level initialize the Octeon PCI controller
 */
static void octeon_pci_initialize(void)
{
        union cvmx_pci_cfg01 cfg01;
        union cvmx_npi_ctl_status ctl_status;
        union cvmx_pci_ctl_status_2 ctl_status_2;
        union cvmx_pci_cfg19 cfg19;
        union cvmx_pci_cfg16 cfg16;
        union cvmx_pci_cfg22 cfg22;
        union cvmx_pci_cfg56 cfg56;

        /* Reset the PCI Bus */
        cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x1);
        cvmx_read_csr(CVMX_CIU_SOFT_PRST);

        udelay(2000);           /* Hold PCI reset for 2 ms */

        ctl_status.u64 = 0;     /* cvmx_read_csr(CVMX_NPI_CTL_STATUS); */
        ctl_status.s.max_word = 1;
        ctl_status.s.timer = 1;
        cvmx_write_csr(CVMX_NPI_CTL_STATUS, ctl_status.u64);

        /* Deassert PCI reset and advertize PCX Host Mode Device Capability
           (64b) */
        cvmx_write_csr(CVMX_CIU_SOFT_PRST, 0x4);
        cvmx_read_csr(CVMX_CIU_SOFT_PRST);

        udelay(2000);           /* Wait 2 ms after deasserting PCI reset */

        ctl_status_2.u32 = 0;
        ctl_status_2.s.tsr_hwm = 1;     /* Initializes to 0.  Must be set
                                           before any PCI reads. */
        ctl_status_2.s.bar2pres = 1;    /* Enable BAR2 */
        ctl_status_2.s.bar2_enb = 1;
        ctl_status_2.s.bar2_cax = 1;    /* Don't use L2 */
        ctl_status_2.s.bar2_esx = 1;
        ctl_status_2.s.pmo_amod = 1;    /* Round robin priority */
        if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
                /* BAR1 hole */
                ctl_status_2.s.bb1_hole = OCTEON_PCI_BAR1_HOLE_BITS;
                ctl_status_2.s.bb1_siz = 1;  /* BAR1 is 2GB */
                ctl_status_2.s.bb_ca = 1;    /* Don't use L2 with big bars */
                ctl_status_2.s.bb_es = 1;    /* Big bar in byte swap mode */
                ctl_status_2.s.bb1 = 1;      /* BAR1 is big */
                ctl_status_2.s.bb0 = 1;      /* BAR0 is big */
        }

        octeon_npi_write32(CVMX_NPI_PCI_CTL_STATUS_2, ctl_status_2.u32);
        udelay(2000);           /* Wait 2 ms before doing PCI reads */

        ctl_status_2.u32 = octeon_npi_read32(CVMX_NPI_PCI_CTL_STATUS_2);
        pr_notice("PCI Status: %s %s-bit\n",
                  ctl_status_2.s.ap_pcix ? "PCI-X" : "PCI",
                  ctl_status_2.s.ap_64ad ? "64" : "32");

        if (OCTEON_IS_MODEL(OCTEON_CN58XX) || OCTEON_IS_MODEL(OCTEON_CN50XX)) {
                union cvmx_pci_cnt_reg cnt_reg_start;
                union cvmx_pci_cnt_reg cnt_reg_end;
                unsigned long cycles, pci_clock;

                cnt_reg_start.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
                cycles = read_c0_cvmcount();
                udelay(1000);
                cnt_reg_end.u64 = cvmx_read_csr(CVMX_NPI_PCI_CNT_REG);
                cycles = read_c0_cvmcount() - cycles;
                pci_clock = (cnt_reg_end.s.pcicnt - cnt_reg_start.s.pcicnt) /
                            (cycles / (mips_hpt_frequency / 1000000));
                pr_notice("PCI Clock: %lu MHz\n", pci_clock);
        }

        /*
         * TDOMC must be set to one in PCI mode. TDOMC should be set to 4
         * in PCI-X mode to allow four oustanding splits. Otherwise,
         * should not change from its reset value. Don't write PCI_CFG19
         * in PCI mode (0x82000001 reset value), write it to 0x82000004
         * after PCI-X mode is known. MRBCI,MDWE,MDRE -> must be zero.
         * MRBCM -> must be one.
         */
        if (ctl_status_2.s.ap_pcix) {
                cfg19.u32 = 0;
                /*
                 * Target Delayed/Split request outstanding maximum
                 * count. [1..31] and 0=32.  NOTE: If the user
                 * programs these bits beyond the Designed Maximum
                 * outstanding count, then the designed maximum table
                 * depth will be used instead.  No additional
                 * Deferred/Split transactions will be accepted if
                 * this outstanding maximum count is
                 * reached. Furthermore, no additional deferred/split
                 * transactions will be accepted if the I/O delay/ I/O
                 * Split Request outstanding maximum is reached.
                 */
                cfg19.s.tdomc = 4;
                /*
                 * Master Deferred Read Request Outstanding Max Count
                 * (PCI only).  CR4C[26:24] Max SAC cycles MAX DAC
                 * cycles 000 8 4 001 1 0 010 2 1 011 3 1 100 4 2 101
                 * 5 2 110 6 3 111 7 3 For example, if these bits are
                 * programmed to 100, the core can support 2 DAC
                 * cycles, 4 SAC cycles or a combination of 1 DAC and
                 * 2 SAC cycles. NOTE: For the PCI-X maximum
                 * outstanding split transactions, refer to
                 * CRE0[22:20].
                 */
                cfg19.s.mdrrmc = 2;
                /*
                 * Master Request (Memory Read) Byte Count/Byte Enable
                 * select. 0 = Byte Enables valid. In PCI mode, a
                 * burst transaction cannot be performed using Memory
                 * Read command=4?h6. 1 = DWORD Byte Count valid
                 * (default). In PCI Mode, the memory read byte
                 * enables are automatically generated by the
                 * core. Note: N3 Master Request transaction sizes are
                 * always determined through the
                 * am_attr[<35:32>|<7:0>] field.
                 */
                cfg19.s.mrbcm = 1;
                octeon_npi_write32(CVMX_NPI_PCI_CFG19, cfg19.u32);
        }


        cfg01.u32 = 0;
        cfg01.s.msae = 1;       /* Memory Space Access Enable */
        cfg01.s.me = 1;         /* Master Enable */
        cfg01.s.pee = 1;        /* PERR# Enable */
        cfg01.s.see = 1;        /* System Error Enable */
        cfg01.s.fbbe = 1;       /* Fast Back to Back Transaction Enable */

        octeon_npi_write32(CVMX_NPI_PCI_CFG01, cfg01.u32);

#ifdef USE_OCTEON_INTERNAL_ARBITER
        /*
         * When OCTEON is a PCI host, most systems will use OCTEON's
         * internal arbiter, so must enable it before any PCI/PCI-X
         * traffic can occur.
         */
        {
                union cvmx_npi_pci_int_arb_cfg pci_int_arb_cfg;

                pci_int_arb_cfg.u64 = 0;
                pci_int_arb_cfg.s.en = 1;       /* Internal arbiter enable */
                cvmx_write_csr(CVMX_NPI_PCI_INT_ARB_CFG, pci_int_arb_cfg.u64);
        }
#endif  /* USE_OCTEON_INTERNAL_ARBITER */

        /*
         * Preferrably written to 1 to set MLTD. [RDSATI,TRTAE,
         * TWTAE,TMAE,DPPMR -> must be zero. TILT -> must not be set to
         * 1..7.
         */
        cfg16.u32 = 0;
        cfg16.s.mltd = 1;       /* Master Latency Timer Disable */
        octeon_npi_write32(CVMX_NPI_PCI_CFG16, cfg16.u32);

        /*
         * Should be written to 0x4ff00. MTTV -> must be zero.
         * FLUSH -> must be 1. MRV -> should be 0xFF.
         */
        cfg22.u32 = 0;
        /* Master Retry Value [1..255] and 0=infinite */
        cfg22.s.mrv = 0xff;
        /*
         * AM_DO_FLUSH_I control NOTE: This bit MUST BE ONE for proper
         * N3K operation.
         */
        cfg22.s.flush = 1;
        octeon_npi_write32(CVMX_NPI_PCI_CFG22, cfg22.u32);

        /*
         * MOST Indicates the maximum number of outstanding splits (in -1
         * notation) when OCTEON is in PCI-X mode.  PCI-X performance is
         * affected by the MOST selection.  Should generally be written
         * with one of 0x3be807, 0x2be807, 0x1be807, or 0x0be807,
         * depending on the desired MOST of 3, 2, 1, or 0, respectively.
         */
        cfg56.u32 = 0;
        cfg56.s.pxcid = 7;      /* RO - PCI-X Capability ID */
        cfg56.s.ncp = 0xe8;     /* RO - Next Capability Pointer */
        cfg56.s.dpere = 1;      /* Data Parity Error Recovery Enable */
        cfg56.s.roe = 1;        /* Relaxed Ordering Enable */
        cfg56.s.mmbc = 1;       /* Maximum Memory Byte Count
                                   [0=512B,1=1024B,2=2048B,3=4096B] */
        cfg56.s.most = 3;       /* Maximum outstanding Split transactions [0=1
                                   .. 7=32] */

        octeon_npi_write32(CVMX_NPI_PCI_CFG56, cfg56.u32);

        /*
         * Affects PCI performance when OCTEON services reads to its
         * BAR1/BAR2. Refer to Section 10.6.1.  The recommended values are
         * 0x22, 0x33, and 0x33 for PCI_READ_CMD_6, PCI_READ_CMD_C, and
         * PCI_READ_CMD_E, respectively. Unfortunately due to errata DDR-700,
         * these values need to be changed so they won't possibly prefetch off
         * of the end of memory if PCI is DMAing a buffer at the end of
         * memory. Note that these values differ from their reset values.
         */
        octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_6, 0x21);
        octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_C, 0x31);
        octeon_npi_write32(CVMX_NPI_PCI_READ_CMD_E, 0x31);
}


/*
 * Initialize the Octeon PCI controller
 */
static int __init octeon_pci_setup(void)
{
        union cvmx_npi_mem_access_subidx mem_access;
        int index;

        /* Only these chips have PCI */
        if (octeon_has_feature(OCTEON_FEATURE_PCIE))
                return 0;

        /* Point pcibios_map_irq() to the PCI version of it */
        octeon_pcibios_map_irq = octeon_pci_pcibios_map_irq;

        /* Only use the big bars on chips that support it */
        if (OCTEON_IS_MODEL(OCTEON_CN31XX) ||
            OCTEON_IS_MODEL(OCTEON_CN38XX_PASS2) ||
            OCTEON_IS_MODEL(OCTEON_CN38XX_PASS1))
                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_SMALL;
        else
                octeon_dma_bar_type = OCTEON_DMA_BAR_TYPE_BIG;

        /* PCI I/O and PCI MEM values */
        set_io_port_base(OCTEON_PCI_IOSPACE_BASE);
        ioport_resource.start = 0;
        ioport_resource.end = OCTEON_PCI_IOSPACE_SIZE - 1;
        if (!octeon_is_pci_host()) {
                pr_notice("Not in host mode, PCI Controller not initialized\n");
                return 0;
        }

        pr_notice("%s Octeon big bar support\n",
                  (octeon_dma_bar_type ==
                  OCTEON_DMA_BAR_TYPE_BIG) ? "Enabling" : "Disabling");

        octeon_pci_initialize();

        mem_access.u64 = 0;
        mem_access.s.esr = 1;   /* Endian-Swap on read. */
        mem_access.s.esw = 1;   /* Endian-Swap on write. */
        mem_access.s.nsr = 0;   /* No-Snoop on read. */
        mem_access.s.nsw = 0;   /* No-Snoop on write. */
        mem_access.s.ror = 0;   /* Relax Read on read. */
        mem_access.s.row = 0;   /* Relax Order on write. */
        mem_access.s.ba = 0;    /* PCI Address bits [63:36]. */
        cvmx_write_csr(CVMX_NPI_MEM_ACCESS_SUBID3, mem_access.u64);

        /*
         * Remap the Octeon BAR 2 above all 32 bit devices
         * (0x8000000000ul).  This is done here so it is remapped
         * before the readl()'s below. We don't want BAR2 overlapping
         * with BAR0/BAR1 during these reads.
         */
        octeon_npi_write32(CVMX_NPI_PCI_CFG08,
                           (u32)(OCTEON_BAR2_PCI_ADDRESS & 0xffffffffull));
        octeon_npi_write32(CVMX_NPI_PCI_CFG09,
                           (u32)(OCTEON_BAR2_PCI_ADDRESS >> 32));

        if (octeon_dma_bar_type == OCTEON_DMA_BAR_TYPE_BIG) {
                /* Remap the Octeon BAR 0 to 0-2GB */
                octeon_npi_write32(CVMX_NPI_PCI_CFG04, 0);
                octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);

                /*
                 * Remap the Octeon BAR 1 to map 2GB-4GB (minus the
                 * BAR 1 hole).
                 */
                octeon_npi_write32(CVMX_NPI_PCI_CFG06, 2ul << 30);
                octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);

                /* BAR1 movable mappings set for identity mapping */
                octeon_bar1_pci_phys = 0x80000000ull;
                for (index = 0; index < 32; index++) {
                        union cvmx_pci_bar1_indexx bar1_index;

                        bar1_index.u32 = 0;
                        /* Address bits[35:22] sent to L2C */
                        bar1_index.s.addr_idx =
                                (octeon_bar1_pci_phys >> 22) + index;
                        /* Don't put PCI accesses in L2. */
                        bar1_index.s.ca = 1;
                        /* Endian Swap Mode */
                        bar1_index.s.end_swp = 1;
                        /* Set '1' when the selected address range is valid. */
                        bar1_index.s.addr_v = 1;
                        octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
                                           bar1_index.u32);
                }

                /* Devices go after BAR1 */
                octeon_pci_mem_resource.start =
                        OCTEON_PCI_MEMSPACE_OFFSET + (4ul << 30) -
                        (OCTEON_PCI_BAR1_HOLE_SIZE << 20);
                octeon_pci_mem_resource.end =
                        octeon_pci_mem_resource.start + (1ul << 30);
        } else {
                /* Remap the Octeon BAR 0 to map 128MB-(128MB+4KB) */
                octeon_npi_write32(CVMX_NPI_PCI_CFG04, 128ul << 20);
                octeon_npi_write32(CVMX_NPI_PCI_CFG05, 0);

                /* Remap the Octeon BAR 1 to map 0-128MB */
                octeon_npi_write32(CVMX_NPI_PCI_CFG06, 0);
                octeon_npi_write32(CVMX_NPI_PCI_CFG07, 0);

                /* BAR1 movable regions contiguous to cover the swiotlb */
                octeon_bar1_pci_phys =
                        virt_to_phys(octeon_swiotlb) & ~((1ull << 22) - 1);

                for (index = 0; index < 32; index++) {
                        union cvmx_pci_bar1_indexx bar1_index;

                        bar1_index.u32 = 0;
                        /* Address bits[35:22] sent to L2C */
                        bar1_index.s.addr_idx =
                                (octeon_bar1_pci_phys >> 22) + index;
                        /* Don't put PCI accesses in L2. */
                        bar1_index.s.ca = 1;
                        /* Endian Swap Mode */
                        bar1_index.s.end_swp = 1;
                        /* Set '1' when the selected address range is valid. */
                        bar1_index.s.addr_v = 1;
                        octeon_npi_write32(CVMX_NPI_PCI_BAR1_INDEXX(index),
                                           bar1_index.u32);
                }

                /* Devices go after BAR0 */
                octeon_pci_mem_resource.start =
                        OCTEON_PCI_MEMSPACE_OFFSET + (128ul << 20) +
                        (4ul << 10);
                octeon_pci_mem_resource.end =
                        octeon_pci_mem_resource.start + (1ul << 30);
        }

        register_pci_controller(&octeon_pci_controller);

        /*
         * Clear any errors that might be pending from before the bus
         * was setup properly.
         */
        cvmx_write_csr(CVMX_NPI_PCI_INT_SUM2, -1);

        octeon_pci_dma_init();

        return 0;
}

arch_initcall(octeon_pci_setup);