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   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 unsigned int vram_size;
  36 unsigned int memc_ctrl_reg;
  37 unsigned int number_mfm_drives;
  38
  39 static int __init parse_tag_acorn(const struct tag *tag)
  40 {
  41         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  42         number_mfm_drives = tag->u.acorn.adfsdrives;
  43
  44         switch (tag->u.acorn.vram_pages) {
  45         case 512:
  46                 vram_size += PAGE_SIZE * 256;
  47         case 256:
  48                 vram_size += PAGE_SIZE * 256;
  49         default:
  50                 break;
  51         }
  52 #if 0
  53         if (vram_size) {
  54                 desc->video_start = 0x02000000;
  55                 desc->video_end   = 0x02000000 + vram_size;
  56         }
  57 #endif
  58         return 0;
  59 }
  60
  61 __tagtable(ATAG_ACORN, parse_tag_acorn);
  62
  63 static struct map_desc rpc_io_desc[] __initdata = {
  64  { SCREEN_BASE, SCREEN_START,   2*1048576, MT_DEVICE }, /* VRAM         */
  65  { (u32)IO_BASE, IO_START,      IO_SIZE  , MT_DEVICE }, /* IO space     */
  66  { EASI_BASE,   EASI_START,     EASI_SIZE, MT_DEVICE }  /* EASI space   */
  67 };
  68
  69 static void __init rpc_map_io(void)
  70 {
  71         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  72
  73         /*
  74          * Turn off floppy.
  75          */
  76         outb(0xc, 0x3f2);
  77
  78         /*
  79          * RiscPC can't handle half-word loads and stores
  80          */
  81         elf_hwcap &= ~HWCAP_HALF;
  82 }
  83
  84 static struct resource acornfb_resources[] = {
  85         {       /* VIDC */
  86                 .start          = 0x03400000,
  87                 .end            = 0x035fffff,
  88                 .flags          = IORESOURCE_MEM,
  89         }, {
  90                 .start          = IRQ_VSYNCPULSE,
  91                 .end            = IRQ_VSYNCPULSE,
  92                 .flags          = IORESOURCE_IRQ,
  93         },
  94 };
  95
  96 static struct platform_device acornfb_device = {
  97         .name                   = "acornfb",
  98         .id                     = -1,
  99         .dev                    = {
 100                 .coherent_dma_mask = 0xffffffff,
 101         },
 102         .num_resources          = ARRAY_SIZE(acornfb_resources),
 103         .resource               = acornfb_resources,
 104 };
 105
 106 static struct resource iomd_resources[] = {
 107         {
 108                 .start          = 0x03200000,
 109                 .end            = 0x0320ffff,
 110                 .flags          = IORESOURCE_MEM,
 111         },
 112 };
 113
 114 static struct platform_device iomd_device = {
 115         .name                   = "iomd",
 116         .id                     = -1,
 117         .num_resources          = ARRAY_SIZE(iomd_resources),
 118         .resource               = iomd_resources,
 119 };
 120
 121 static struct platform_device kbd_device = {
 122         .name                   = "kart",
 123         .id                     = -1,
 124         .dev                    = {
 125                 .parent         = &iomd_device.dev,
 126         },
 127 };
 128
 129 static struct plat_serial8250_port serial_platform_data[] = {
 130         {
 131                 .mapbase        = 0x03010fe0,
 132                 .irq            = 10,
 133                 .uartclk        = 1843200,
 134                 .regshift       = 2,
 135                 .iotype         = UPIO_MEM,
 136                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 137         },
 138         { },
 139 };
 140
 141 static struct platform_device serial_device = {
 142         .name                   = "serial8250",
 143         .id                     = 0,
 144         .dev                    = {
 145                 .platform_data  = serial_platform_data,
 146         },
 147 };
 148
 149 static struct platform_device *devs[] __initdata = {
 150         &iomd_device,
 151         &kbd_device,
 152         &serial_device,
 153         &acornfb_device,
 154 };
 155
 156 static int __init rpc_init(void)
 157 {
 158         return platform_add_devices(devs, ARRAY_SIZE(devs));
 159 }
 160
 161 arch_initcall(rpc_init);
 162
 163 extern struct sys_timer ioc_timer;
 164
 165 MACHINE_START(RISCPC, "Acorn-RiscPC")
 166         /* Maintainer: Russell King */
 167         .phys_ram       = 0x10000000,
 168         .phys_io        = 0x03000000,
 169         .io_pg_offst    = ((0xe0000000) >> 18) & 0xfffc,
 170         .boot_params    = 0x10000100,
 171         .reserve_lp0    = 1,
 172         .reserve_lp1    = 1,
 173         .map_io         = rpc_map_io,
 174         .init_irq       = rpc_init_irq,
 175         .timer          = &ioc_timer,
 176 MACHINE_END