/*
 * 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) 2000, 2001 Keith M Wesolowski
 */
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/types.h>
#include <asm/ip32/mace.h>

#if 0
# define DPRINTK(args...) printk(args);
#else
# define DPRINTK(args...)
#endif

/*
 * O2 has up to 5 PCI devices connected into the MACE bridge.  The device
 * map looks like this:
 *
 * 0  aic7xxx 0
 * 1  aic7xxx 1
 * 2  expansion slot
 * 3  N/C
 * 4  N/C
 */

static inline int mkaddr(struct pci_bus *bus, unsigned int devfn,
        unsigned int reg)
{
        return ((bus->number & 0xff) << 16) |
                ((devfn & 0xff) << 8) |
                (reg & 0xfc);
}


static int
mace_pci_read_config(struct pci_bus *bus, unsigned int devfn,
                     int reg, int size, u32 *val)
{
        u32 control = mace->pci.control;

        /* disable master aborts interrupts during config read */
        mace->pci.control = control & ~MACEPCI_CONTROL_MAR_INT;
        mace->pci.config_addr = mkaddr(bus, devfn, reg);
        switch (size) {
        case 1:
                *val = mace->pci.config_data.b[(reg & 3) ^ 3];
                break;
        case 2:
                *val = mace->pci.config_data.w[((reg >> 1) & 1) ^ 1];
                break;
        case 4:
                *val = mace->pci.config_data.l;
                break;
        }
        /* ack possible master abort */
        mace->pci.error &= ~MACEPCI_ERROR_MASTER_ABORT;
        mace->pci.control = control;
        /*
         * someone forgot to set the ultra bit for the onboard
         * scsi chips; we fake it here
         */
        if (bus->number == 0 && reg == 0x40 && size == 4 &&
            (devfn == (1 << 3) || devfn == (2 << 3)))
                *val |= 0x1000;

        DPRINTK("read%d: reg=%08x,val=%02x\n", size * 8, reg, *val);

        return PCIBIOS_SUCCESSFUL;
}

static int
mace_pci_write_config(struct pci_bus *bus, unsigned int devfn,
                      int reg, int size, u32 val)
{
        mace->pci.config_addr = mkaddr(bus, devfn, reg);
        switch (size) {
        case 1:
                mace->pci.config_data.b[(reg & 3) ^ 3] = val;
                break;
        case 2:
                mace->pci.config_data.w[((reg >> 1) & 1) ^ 1] = val;
                break;
        case 4:
                mace->pci.config_data.l = val;
                break;
        }

        DPRINTK("write%d: reg=%08x,val=%02x\n", size * 8, reg, val);

        return PCIBIOS_SUCCESSFUL;
}

struct pci_ops mace_pci_ops = {
        .read = mace_pci_read_config,
        .write = mace_pci_write_config,
};