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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         {       /* VRAM         */
  65                 .virtual        =  SCREEN_BASE,
  66                 .pfn            = __phys_to_pfn(SCREEN_START),
  67                 .length         =       2*1048576,
  68                 .type           = MT_DEVICE
  69         }, {    /* IO space     */
  70                 .virtual        =  (u32)IO_BASE,
  71                 .pfn            = __phys_to_pfn(IO_START),
  72                 .length         =       IO_SIZE  ,
  73                 .type           = MT_DEVICE
  74         }, {    /* EASI space   */
  75                 .virtual        = EASI_BASE,
  76                 .pfn            = __phys_to_pfn(EASI_START),
  77                 .length         = EASI_SIZE,
  78                 .type           = MT_DEVICE
  79         }
  80 };
  81
  82 static void __init rpc_map_io(void)
  83 {
  84         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  85
  86         /*
  87          * Turn off floppy.
  88          */
  89         outb(0xc, 0x3f2);
  90
  91         /*
  92          * RiscPC can't handle half-word loads and stores
  93          */
  94         elf_hwcap &= ~HWCAP_HALF;
  95 }
  96
  97 static struct resource acornfb_resources[] = {
  98         {       /* VIDC */
  99                 .start          = 0x03400000,
 100                 .end            = 0x035fffff,
 101                 .flags          = IORESOURCE_MEM,
 102         }, {
 103                 .start          = IRQ_VSYNCPULSE,
 104                 .end            = IRQ_VSYNCPULSE,
 105                 .flags          = IORESOURCE_IRQ,
 106         },
 107 };
 108
 109 static struct platform_device acornfb_device = {
 110         .name                   = "acornfb",
 111         .id                     = -1,
 112         .dev                    = {
 113                 .coherent_dma_mask = 0xffffffff,
 114         },
 115         .num_resources          = ARRAY_SIZE(acornfb_resources),
 116         .resource               = acornfb_resources,
 117 };
 118
 119 static struct resource iomd_resources[] = {
 120         {
 121                 .start          = 0x03200000,
 122                 .end            = 0x0320ffff,
 123                 .flags          = IORESOURCE_MEM,
 124         },
 125 };
 126
 127 static struct platform_device iomd_device = {
 128         .name                   = "iomd",
 129         .id                     = -1,
 130         .num_resources          = ARRAY_SIZE(iomd_resources),
 131         .resource               = iomd_resources,
 132 };
 133
 134 static struct platform_device kbd_device = {
 135         .name                   = "kart",
 136         .id                     = -1,
 137         .dev                    = {
 138                 .parent         = &iomd_device.dev,
 139         },
 140 };
 141
 142 static struct plat_serial8250_port serial_platform_data[] = {
 143         {
 144                 .mapbase        = 0x03010fe0,
 145                 .irq            = 10,
 146                 .uartclk        = 1843200,
 147                 .regshift       = 2,
 148                 .iotype         = UPIO_MEM,
 149                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 150         },
 151         { },
 152 };
 153
 154 static struct platform_device serial_device = {
 155         .name                   = "serial8250",
 156         .id                     = PLAT8250_DEV_PLATFORM,
 157         .dev                    = {
 158                 .platform_data  = serial_platform_data,
 159         },
 160 };
 161
 162 static struct platform_device *devs[] __initdata = {
 163         &iomd_device,
 164         &kbd_device,
 165         &serial_device,
 166         &acornfb_device,
 167 };
 168
 169 static int __init rpc_init(void)
 170 {
 171         return platform_add_devices(devs, ARRAY_SIZE(devs));
 172 }
 173
 174 arch_initcall(rpc_init);
 175
 176 extern struct sys_timer ioc_timer;
 177
 178 MACHINE_START(RISCPC, "Acorn-RiscPC")
 179         /* Maintainer: Russell King */
 180         .phys_io        = 0x03000000,
 181         .io_pg_offst    = ((0xe0000000) >> 18) & 0xfffc,
 182         .boot_params    = 0x10000100,
 183         .reserve_lp0    = 1,
 184         .reserve_lp1    = 1,
 185         .map_io         = rpc_map_io,
 186         .init_irq       = rpc_init_irq,
 187         .timer          = &ioc_timer,
 188 MACHINE_END