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riscpc.c

/*
 *  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/pata_platform.h>

#include <asm/elf.h>
#include <asm/io.h>
#include <asm/mach-types.h>
#include <asm/hardware.h>
#include <asm/page.h>
#include <asm/domain.h>
#include <asm/setup.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    = 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 */
            .start            = 0x03400000,
            .end        = 0x035fffff,
            .flags            = IORESOURCE_MEM,
      }, {
            .start            = IRQ_VSYNCPULSE,
            .end        = IRQ_VSYNCPULSE,
            .flags            = IORESOURCE_IRQ,
      },
};

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[] = {
      {
            .start            = 0x03200000,
            .end        = 0x0320ffff,
            .flags            = IORESOURCE_MEM,
      },
};

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

static struct platform_device kbd_device = {
      .name             = "kart",
      .id               = -1,
      .dev              = {
            .parent     = &iomd_device.dev,
      },
};

static struct plat_serial8250_port serial_platform_data[] = {
      {
            .mapbase    = 0x03010fe0,
            .irq        = 10,
            .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[] = {
      [0] = {
            .start            = 0x030107c0,
            .end        = 0x030107df,
            .flags            = IORESOURCE_MEM,
      },
      [1] = {
            .start            = 0x03010fd8,
            .end        = 0x03010fdb,
            .flags            = IORESOURCE_MEM,
      },
      [2] = {
            .start            = IRQ_HARDDISK,
            .end        = IRQ_HARDDISK,
            .flags            = IORESOURCE_IRQ,
      },
};

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 int __init rpc_init(void)
{
      return platform_add_devices(devs, ARRAY_SIZE(devs));
}

arch_initcall(rpc_init);

extern struct sys_timer ioc_timer;

MACHINE_START(RISCPC, "Acorn-RiscPC")
      /* Maintainer: Russell King */
      .phys_io    = 0x03000000,
      .io_pg_offst      = ((0xe0000000) >> 18) & 0xfffc,
      .boot_params      = 0x10000100,
      .reserve_lp0      = 1,
      .reserve_lp1      = 1,
      .map_io           = rpc_map_io,
      .init_irq   = rpc_init_irq,
      .timer            = &ioc_timer,
MACHINE_END

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