ops-sh4-202.c

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/*
 * arch/sh/drivers/superhyway/ops-sh4-202.c
 *
 * SuperHyway bus support for SH4-202
 *
 * Copyright (C) 2005  Paul Mundt
 *
 * 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.
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/superhyway.h>
#include <linux/string.h>
#include <asm/addrspace.h>
#include <asm/io.h>

#define PHYS_EMI_CBLOCK     P4SEGADDR(0x1ec00000)
#define PHYS_EMI_DBLOCK     P4SEGADDR(0x08000000)
#define PHYS_FEMI_CBLOCK    P4SEGADDR(0x1f800000)
#define PHYS_FEMI_DBLOCK    P4SEGADDR(0x00000000)

#define PHYS_EPBR_BLOCK     P4SEGADDR(0x1de00000)
#define PHYS_DMAC_BLOCK     P4SEGADDR(0x1fa00000)
#define PHYS_PBR_BLOCK      P4SEGADDR(0x1fc00000)

static struct resource emi_resources[] = {
    [0] = {
        .start  = PHYS_EMI_CBLOCK,
        .end    = PHYS_EMI_CBLOCK + 0x00300000 - 1,
        .flags  = IORESOURCE_MEM,
    },
    [1] = {
        .start  = PHYS_EMI_DBLOCK,
        .end    = PHYS_EMI_DBLOCK + 0x08000000 - 1,
        .flags  = IORESOURCE_MEM,
    },
};

static struct superhyway_device emi_device = {
    .name       = "emi",
    .num_resources  = ARRAY_SIZE(emi_resources),
    .resource   = emi_resources,
};

static struct resource femi_resources[] = {
    [0] = {
        .start  = PHYS_FEMI_CBLOCK,
        .end    = PHYS_FEMI_CBLOCK + 0x00100000 - 1,
        .flags  = IORESOURCE_MEM,
    },
    [1] = {
        .start  = PHYS_FEMI_DBLOCK,
        .end    = PHYS_FEMI_DBLOCK + 0x08000000 - 1,
        .flags  = IORESOURCE_MEM,
    },
};

static struct superhyway_device femi_device = {
    .name       = "femi",
    .num_resources  = ARRAY_SIZE(femi_resources),
    .resource   = femi_resources,
};

static struct resource epbr_resources[] = {
    [0] = {
        .start  = P4SEGADDR(0x1e7ffff8),
        .end    = P4SEGADDR(0x1e7ffff8 + (sizeof(u32) * 2) - 1),
        .flags  = IORESOURCE_MEM,
    },
    [1] = {
        .start  = PHYS_EPBR_BLOCK,
        .end    = PHYS_EPBR_BLOCK + 0x00a00000 - 1,
        .flags  = IORESOURCE_MEM,
    },
};

static struct superhyway_device epbr_device = {
    .name       = "epbr",
    .num_resources  = ARRAY_SIZE(epbr_resources),
    .resource   = epbr_resources,
};

static struct resource dmac_resource = {
    .start  = PHYS_DMAC_BLOCK,
    .end    = PHYS_DMAC_BLOCK + 0x00100000 - 1,
    .flags  = IORESOURCE_MEM,
};

static struct superhyway_device dmac_device = {
    .name       = "dmac",
    .num_resources  = 1,
    .resource   = &dmac_resource,
};

static struct resource pbr_resources[] = {
    [0] = {
        .start  = P4SEGADDR(0x1ffffff8),
        .end    = P4SEGADDR(0x1ffffff8 + (sizeof(u32) * 2) - 1),
        .flags  = IORESOURCE_MEM,
    },
    [1] = {
        .start  = PHYS_PBR_BLOCK,
        .end    = PHYS_PBR_BLOCK + 0x00400000 - (sizeof(u32) * 2) - 1,
        .flags  = IORESOURCE_MEM,
    },
};

static struct superhyway_device pbr_device = {
    .name       = "pbr",
    .num_resources  = ARRAY_SIZE(pbr_resources),
    .resource   = pbr_resources,
};

static struct superhyway_device *sh4202_devices[] __initdata = {
    &emi_device, &femi_device, &epbr_device, &dmac_device, &pbr_device,
};

static int sh4202_read_vcr(unsigned long base, struct superhyway_vcr_info *vcr)
{
    u32 vcrh, vcrl;
    u64 tmp;

    /*
     * XXX: Even though the SH4-202 Evaluation Device documentation
     * indicates that VCRL is mapped first with VCRH at a + 0x04
     * offset, the opposite seems to be true.
     *
     * Some modules (PBR and ePBR for instance) also appear to have
     * VCRL/VCRH flipped in the documentation, but on the SH4-202
     * itself it appears that these are all consistently mapped with
     * VCRH preceding VCRL.
     *
     * Do not trust the documentation, for it is evil.
     */
    vcrh = __raw_readl(base);
    vcrl = __raw_readl(base + sizeof(u32));

    tmp = ((u64)vcrh << 32) | vcrl;
    memcpy(vcr, &tmp, sizeof(u64));

    return 0;
}

static int sh4202_write_vcr(unsigned long base, struct superhyway_vcr_info vcr)
{
    u64 tmp = *(u64 *)&vcr;

    __raw_writel((tmp >> 32) & 0xffffffff, base);
    __raw_writel(tmp & 0xffffffff, base + sizeof(u32));

    return 0;
}

static struct superhyway_ops sh4202_superhyway_ops = {
    .read_vcr   = sh4202_read_vcr,
    .write_vcr  = sh4202_write_vcr,
};

struct superhyway_bus superhyway_channels[] = {
    { &sh4202_superhyway_ops, },
    { 0, },
};

int __init superhyway_scan_bus(struct superhyway_bus *bus)
{
    return superhyway_add_devices(bus, sh4202_devices,
                      ARRAY_SIZE(sh4202_devices));
}