arch/arm/mach-rpc/riscpc.c

   1 /*
   2  *  linux/arch/arm/mach-rpc/riscpc.c
   3  *
   4  *  Copyright (C) 1998-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  *  Architecture specific fixups.
  11  */
  12 #include <linux/kernel.h>
  13 #include <linux/tty.h>
  14 #include <linux/delay.h>
  15 #include <linux/pm.h>
  16 #include <linux/init.h>
  17
  18 #include <asm/elf.h>
  19 #include <asm/io.h>
  20 #include <asm/mach-types.h>
  21 #include <asm/hardware.h>
  22 #include <asm/page.h>
  23 #include <asm/domain.h>
  24 #include <asm/setup.h>
  25
  26 #include <asm/mach/map.h>
  27 #include <asm/mach/arch.h>
  28
  29 extern void rpc_init_irq(void);
  30
  31 extern unsigned int vram_size;
  32
  33 #if 0
  34
  35 unsigned int memc_ctrl_reg;
  36 unsigned int number_mfm_drives;
  37
  38 static int __init parse_tag_acorn(const struct tag *tag)
  39 {
  40         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  41         number_mfm_drives = tag->u.acorn.adfsdrives;
  42
  43         switch (tag->u.acorn.vram_pages) {
  44         case 512:
  45                 vram_size += PAGE_SIZE * 256;
  46         case 256:
  47                 vram_size += PAGE_SIZE * 256;
  48         default:
  49                 break;
  50         }
  51 #if 0
  52         if (vram_size) {
  53                 desc->video_start = 0x02000000;
  54                 desc->video_end   = 0x02000000 + vram_size;
  55         }
  56 #endif
  57         return 0;
  58 }
  59
  60 __tagtable(ATAG_ACORN, parse_tag_acorn);
  61
  62 #endif
  63
  64 static struct map_desc rpc_io_desc[] __initdata = {
  65  { SCREEN_BASE, SCREEN_START,   2*1048576, MT_DEVICE }, /* VRAM         */
  66  { IO_BASE,     IO_START,       IO_SIZE  , MT_DEVICE }, /* IO space             */
  67  { EASI_BASE,   EASI_START,     EASI_SIZE, MT_DEVICE }  /* EASI space   */
  68 };
  69
  70 void __init rpc_map_io(void)
  71 {
  72         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  73
  74         /*
  75          * Turn off floppy.
  76          */
  77         outb(0xc, 0x3f2);
  78
  79         /*
  80          * RiscPC can't handle half-word loads and stores
  81          */
  82         elf_hwcap &= ~HWCAP_HALF;
  83 }
  84
  85 MACHINE_START(RISCPC, "Acorn-RiscPC")
  86         MAINTAINER("Russell King")
  87         BOOT_MEM(0x10000000, 0x03000000, 0xe0000000)
  88         BOOT_PARAMS(0x10000100)
  89         DISABLE_PARPORT(0)
  90         DISABLE_PARPORT(1)
  91         MAPIO(rpc_map_io)
  92         INITIRQ(rpc_init_irq)
  93 MACHINE_END