riscpc.c

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/*
 *  linux/arch/arm/mach-rpc/riscpc.c
 *
 *  Copyright (C) 1998-2001 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 *  Architecture specific fixups.
 */
#include <linux/kernel.h>
#include <linux/tty.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/device.h>
#include <linux/serial_8250.h>
#include <linux/ata_platform.h>
#include <linux/io.h>
#include <linux/i2c.h>

#include <asm/elf.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <asm/hardware/iomd.h>
#include <asm/page.h>
#include <asm/domain.h>
#include <asm/setup.h>
#include <asm/system_misc.h>

#include <asm/mach/map.h>
#include <asm/mach/arch.h>
#include <asm/mach/time.h>

extern void rpc_init_irq(void);

unsigned int vram_size;
unsigned int memc_ctrl_reg;
unsigned int number_mfm_drives;

static int __init parse_tag_acorn(const struct tag *tag)
{
    memc_ctrl_reg = tag->u.acorn.memc_control_reg;
    number_mfm_drives = tag->u.acorn.adfsdrives;

    switch (tag->u.acorn.vram_pages) {
    case 512:
        vram_size += PAGE_SIZE * 256;
    case 256:
        vram_size += PAGE_SIZE * 256;
    default:
        break;
    }
#if 0
    if (vram_size) {
        desc->video_start = 0x02000000;
        desc->video_end   = 0x02000000 + vram_size;
    }
#endif
    return 0;
}

__tagtable(ATAG_ACORN, parse_tag_acorn);

static struct map_desc rpc_io_desc[] __initdata = {
    {   /* VRAM     */
        .virtual    =  SCREEN_BASE,
        .pfn        = __phys_to_pfn(SCREEN_START),
        .length     =   2*1048576,
        .type       = MT_DEVICE
    }, {    /* IO space */
        .virtual    =  (u32)IO_BASE,
        .pfn        = __phys_to_pfn(IO_START),
        .length     =   IO_SIZE  ,
        .type       = MT_DEVICE
    }, {    /* EASI space   */
        .virtual    = (unsigned long)EASI_BASE,
        .pfn        = __phys_to_pfn(EASI_START),
        .length     = EASI_SIZE,
        .type       = MT_DEVICE
    }
};

static void __init rpc_map_io(void)
{
    iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));

    /*
     * Turn off floppy.
     */
    writeb(0xc, PCIO_BASE + (0x3f2 << 2));

    /*
     * RiscPC can't handle half-word loads and stores
     */
    elf_hwcap &= ~HWCAP_HALF;
}

static struct resource acornfb_resources[] = {
    /* VIDC */
    DEFINE_RES_MEM(0x03400000, 0x00200000),
    DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
};

static struct platform_device acornfb_device = {
    .name           = "acornfb",
    .id         = -1,
    .dev            = {
        .coherent_dma_mask = 0xffffffff,
    },
    .num_resources      = ARRAY_SIZE(acornfb_resources),
    .resource       = acornfb_resources,
};

static struct resource iomd_resources[] = {
    DEFINE_RES_MEM(0x03200000, 0x10000),
};

static struct platform_device iomd_device = {
    .name           = "iomd",
    .id         = -1,
    .num_resources      = ARRAY_SIZE(iomd_resources),
    .resource       = iomd_resources,
};

static struct resource iomd_kart_resources[] = {
    DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
    DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
};

static struct platform_device kbd_device = {
    .name           = "kart",
    .id         = -1,
    .dev            = {
        .parent     = &iomd_device.dev,
    },
    .num_resources      = ARRAY_SIZE(iomd_kart_resources),
    .resource       = iomd_kart_resources,
};

static struct plat_serial8250_port serial_platform_data[] = {
    {
        .mapbase    = 0x03010fe0,
        .irq        = IRQ_SERIALPORT,
        .uartclk    = 1843200,
        .regshift   = 2,
        .iotype     = UPIO_MEM,
        .flags      = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
    },
    { },
};

static struct platform_device serial_device = {
    .name           = "serial8250",
    .id         = PLAT8250_DEV_PLATFORM,
    .dev            = {
        .platform_data  = serial_platform_data,
    },
};

static struct pata_platform_info pata_platform_data = {
    .ioport_shift       = 2,
};

static struct resource pata_resources[] = {
    DEFINE_RES_MEM(0x030107c0, 0x20),
    DEFINE_RES_MEM(0x03010fd8, 0x04),
    DEFINE_RES_IRQ(IRQ_HARDDISK),
};

static struct platform_device pata_device = {
    .name           = "pata_platform",
    .id         = -1,
    .num_resources      = ARRAY_SIZE(pata_resources),
    .resource       = pata_resources,
    .dev            = {
        .platform_data  = &pata_platform_data,
        .coherent_dma_mask = ~0,    /* grumble */
    },
};

static struct platform_device *devs[] __initdata = {
    &iomd_device,
    &kbd_device,
    &serial_device,
    &acornfb_device,
    &pata_device,
};

static struct i2c_board_info i2c_rtc = {
    I2C_BOARD_INFO("pcf8583", 0x50)
};

static int __init rpc_init(void)
{
    i2c_register_board_info(0, &i2c_rtc, 1);
    return platform_add_devices(devs, ARRAY_SIZE(devs));
}

arch_initcall(rpc_init);

static void rpc_restart(char mode, const char *cmd)
{
    iomd_writeb(0, IOMD_ROMCR0);

    /*
     * Jump into the ROM
     */
    soft_restart(0);
}

extern struct sys_timer ioc_timer;

MACHINE_START(RISCPC, "Acorn-RiscPC")
    /* Maintainer: Russell King */
    .atag_offset    = 0x100,
    .reserve_lp0    = 1,
    .reserve_lp1    = 1,
    .map_io     = rpc_map_io,
    .init_irq   = rpc_init_irq,
    .timer      = &ioc_timer,
    .restart    = rpc_restart,
MACHINE_END