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 #include <linux/sched.h>
  18 #include <linux/device.h>
  19 #include <linux/serial_8250.h>
  20
  21 #include <asm/elf.h>
  22 #include <asm/io.h>
  23 #include <asm/mach-types.h>
  24 #include <asm/hardware.h>
  25 #include <asm/page.h>
  26 #include <asm/domain.h>
  27 #include <asm/setup.h>
  28
  29 #include <asm/mach/map.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/time.h>
  32
  33 extern void rpc_init_irq(void);
  34
  35 extern unsigned int vram_size;
  36
  37 #if 0
  38
  39 unsigned int memc_ctrl_reg;
  40 unsigned int number_mfm_drives;
  41
  42 static int __init parse_tag_acorn(const struct tag *tag)
  43 {
  44         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  45         number_mfm_drives = tag->u.acorn.adfsdrives;
  46
  47         switch (tag->u.acorn.vram_pages) {
  48         case 512:
  49                 vram_size += PAGE_SIZE * 256;
  50         case 256:
  51                 vram_size += PAGE_SIZE * 256;
  52         default:
  53                 break;
  54         }
  55 #if 0
  56         if (vram_size) {
  57                 desc->video_start = 0x02000000;
  58                 desc->video_end   = 0x02000000 + vram_size;
  59         }
  60 #endif
  61         return 0;
  62 }
  63
  64 __tagtable(ATAG_ACORN, parse_tag_acorn);
  65
  66 #endif
  67
  68 static struct map_desc rpc_io_desc[] __initdata = {
  69  { SCREEN_BASE, SCREEN_START,   2*1048576, MT_DEVICE }, /* VRAM         */
  70  { (u32)IO_BASE, IO_START,      IO_SIZE  , MT_DEVICE }, /* IO space     */
  71  { EASI_BASE,   EASI_START,     EASI_SIZE, MT_DEVICE }  /* EASI space   */
  72 };
  73
  74 static void __init rpc_map_io(void)
  75 {
  76         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  77
  78         /*
  79          * Turn off floppy.
  80          */
  81         outb(0xc, 0x3f2);
  82
  83         /*
  84          * RiscPC can't handle half-word loads and stores
  85          */
  86         elf_hwcap &= ~HWCAP_HALF;
  87 }
  88
  89 static struct resource acornfb_resources[] = {
  90         {       /* VIDC */
  91                 .start          = 0x03400000,
  92                 .end            = 0x035fffff,
  93                 .flags          = IORESOURCE_MEM,
  94         }, {
  95                 .start          = IRQ_VSYNCPULSE,
  96                 .end            = IRQ_VSYNCPULSE,
  97                 .flags          = IORESOURCE_IRQ,
  98         },
  99 };
 100
 101 static struct platform_device acornfb_device = {
 102         .name                   = "acornfb",
 103         .id                     = -1,
 104         .dev                    = {
 105                 .coherent_dma_mask = 0xffffffff,
 106         },
 107         .num_resources          = ARRAY_SIZE(acornfb_resources),
 108         .resource               = acornfb_resources,
 109 };
 110
 111 static struct resource iomd_resources[] = {
 112         {
 113                 .start          = 0x03200000,
 114                 .end            = 0x0320ffff,
 115                 .flags          = IORESOURCE_MEM,
 116         },
 117 };
 118
 119 static struct platform_device iomd_device = {
 120         .name                   = "iomd",
 121         .id                     = -1,
 122         .num_resources          = ARRAY_SIZE(iomd_resources),
 123         .resource               = iomd_resources,
 124 };
 125
 126 static struct platform_device kbd_device = {
 127         .name                   = "kart",
 128         .id                     = -1,
 129         .dev                    = {
 130                 .parent         = &iomd_device.dev,
 131         },
 132 };
 133
 134 static struct plat_serial8250_port serial_platform_data[] = {
 135         {
 136                 .mapbase        = 0x03010fe0,
 137                 .irq            = 10,
 138                 .uartclk        = 1843200,
 139                 .regshift       = 2,
 140                 .iotype         = UPIO_MEM,
 141                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 142         },
 143         { },
 144 };
 145
 146 static struct platform_device serial_device = {
 147         .name                   = "serial8250",
 148         .id                     = 0,
 149         .dev                    = {
 150                 .platform_data  = serial_platform_data,
 151         },
 152 };
 153
 154 static struct platform_device *devs[] __initdata = {
 155         &iomd_device,
 156         &kbd_device,
 157         &serial_device,
 158         &acornfb_device,
 159 };
 160
 161 static int __init rpc_init(void)
 162 {
 163         return platform_add_devices(devs, ARRAY_SIZE(devs));
 164 }
 165
 166 arch_initcall(rpc_init);
 167
 168 extern struct sys_timer ioc_timer;
 169
 170 MACHINE_START(RISCPC, "Acorn-RiscPC")
 171         MAINTAINER("Russell King")
 172         BOOT_MEM(0x10000000, 0x03000000, 0xe0000000)
 173         BOOT_PARAMS(0x10000100)
 174         DISABLE_PARPORT(0)
 175         DISABLE_PARPORT(1)
 176         MAPIO(rpc_map_io)
 177         INITIRQ(rpc_init_irq)
 178         .timer          = &ioc_timer,
 179 MACHINE_END