ops-emma2rh.c

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/*
 *  Copyright (C) NEC Electronics Corporation 2004-2006
 *
 *  This file is based on the arch/mips/pci/ops-vr41xx.c
 *
 *  Copyright 2001 MontaVista Software Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/types.h>

#include <asm/addrspace.h>
#include <asm/debug.h>

#include <asm/emma/emma2rh.h>

#define RTABORT (0x1<<9)
#define RMABORT (0x1<<10)
#define EMMA2RH_PCI_SLOT_NUM 9  /* 0000:09.0 is final PCI device */

/*
 * access config space
 */

static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
{
    /* check if the bus is top-level */
    if (bus->parent != NULL) {
        *bus_num = bus->number;
        db_assert(bus_num != NULL);
    } else
        *bus_num = 0;

    if (*bus_num == 0) {
        /* Type 0 */
        if (PCI_SLOT(devfn) >= 10)
            return PCIBIOS_DEVICE_NOT_FOUND;
    } else {
        /* Type 1 */
        if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
            return PCIBIOS_DEVICE_NOT_FOUND;
    }
    return 0;
}

static inline int set_pci_configuration_address(unsigned char bus_num,
                        unsigned int devfn, int where)
{
    u32 config_win0;

    emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
    if (bus_num == 0)
        /*
         * Type 0 configuration
         */
        config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
    else
        /*
         * Type 1 configuration
         */
        config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
            (1 << 15) | (5 << 9);

    emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);

    return 0;
}

static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
               int size, uint32_t * val)
{
    u32 bus_num;
    u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
    u32 backup_win0;
    u32 data;

    *val = 0xffffffffU;

    if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
        return PCIBIOS_DEVICE_NOT_FOUND;

    backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);

    if (set_pci_configuration_address(bus_num, devfn, where) < 0)
        return PCIBIOS_DEVICE_NOT_FOUND;

    data =
        *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
                  (where & 0xfffffffc));

    switch (size) {
    case 1:
        *val = (data >> ((where & 3) << 3)) & 0xffU;
        break;
    case 2:
        *val = (data >> ((where & 2) << 3)) & 0xffffU;
        break;
    case 4:
        *val = data;
        break;
    default:
        emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
        return PCIBIOS_FUNC_NOT_SUPPORTED;
    }

    emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);

    if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
        return PCIBIOS_DEVICE_NOT_FOUND;

    return PCIBIOS_SUCCESSFUL;
}

static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
                int size, u32 val)
{
    u32 bus_num;
    u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
    u32 backup_win0;
    u32 data;
    int shift;

    if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
        return PCIBIOS_DEVICE_NOT_FOUND;

    backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);

    if (set_pci_configuration_address(bus_num, devfn, where) < 0)
        return PCIBIOS_DEVICE_NOT_FOUND;

    /* read modify write */
    data =
        *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
                  (where & 0xfffffffc));

    switch (size) {
    case 1:
        shift = (where & 3) << 3;
        data &= ~(0xffU << shift);
        data |= ((val & 0xffU) << shift);
        break;
    case 2:
        shift = (where & 2) << 3;
        data &= ~(0xffffU << shift);
        data |= ((val & 0xffffU) << shift);
        break;
    case 4:
        data = val;
        break;
    default:
        emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
        return PCIBIOS_FUNC_NOT_SUPPORTED;
    }
    *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
              (where & 0xfffffffc)) = data;

    emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
    if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
        return PCIBIOS_DEVICE_NOT_FOUND;

    return PCIBIOS_SUCCESSFUL;
}

struct pci_ops emma2rh_pci_ops = {
    .read = pci_config_read,
    .write = pci_config_write,
};