kernel/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 #include <linux/ata_platform.h>
  21 #include <linux/io.h>
  22 #include <linux/i2c.h>
  23 #include <linux/reboot.h>
  24
  25 #include <asm/elf.h>
  26 #include <asm/mach-types.h>
  27 #include <mach/hardware.h>
  28 #include <asm/hardware/iomd.h>
  29 #include <asm/page.h>
  30 #include <asm/domain.h>
  31 #include <asm/setup.h>
  32 #include <asm/system_misc.h>
  33
  34 #include <asm/mach/map.h>
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/time.h>
  37
  38 extern void rpc_init_irq(void);
  39
  40 unsigned int vram_size;
  41 unsigned int memc_ctrl_reg;
  42 unsigned int number_mfm_drives;
  43
  44 static int __init parse_tag_acorn(const struct tag *tag)
  45 {
  46         memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  47         number_mfm_drives = tag->u.acorn.adfsdrives;
  48
  49         switch (tag->u.acorn.vram_pages) {
  50         case 512:
  51                 vram_size += PAGE_SIZE * 256;
  52         case 256:
  53                 vram_size += PAGE_SIZE * 256;
  54         default:
  55                 break;
  56         }
  57 #if 0
  58         if (vram_size) {
  59                 desc->video_start = 0x02000000;
  60                 desc->video_end   = 0x02000000 + vram_size;
  61         }
  62 #endif
  63         return 0;
  64 }
  65
  66 __tagtable(ATAG_ACORN, parse_tag_acorn);
  67
  68 static struct map_desc rpc_io_desc[] __initdata = {
  69         {       /* VRAM         */
  70                 .virtual        =  SCREEN_BASE,
  71                 .pfn            = __phys_to_pfn(SCREEN_START),
  72                 .length         =       2*1048576,
  73                 .type           = MT_DEVICE
  74         }, {    /* IO space     */
  75                 .virtual        =  (u32)IO_BASE,
  76                 .pfn            = __phys_to_pfn(IO_START),
  77                 .length         =       IO_SIZE  ,
  78                 .type           = MT_DEVICE
  79         }, {    /* EASI space   */
  80                 .virtual        = (unsigned long)EASI_BASE,
  81                 .pfn            = __phys_to_pfn(EASI_START),
  82                 .length         = EASI_SIZE,
  83                 .type           = MT_DEVICE
  84         }
  85 };
  86
  87 static void __init rpc_map_io(void)
  88 {
  89         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  90
  91         /*
  92          * Turn off floppy.
  93          */
  94         writeb(0xc, PCIO_BASE + (0x3f2 << 2));
  95
  96         /*
  97          * RiscPC can't handle half-word loads and stores
  98          */
  99         elf_hwcap &= ~HWCAP_HALF;
 100 }
 101
 102 static struct resource acornfb_resources[] = {
 103         /* VIDC */
 104         DEFINE_RES_MEM(0x03400000, 0x00200000),
 105         DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
 106 };
 107
 108 static struct platform_device acornfb_device = {
 109         .name                   = "acornfb",
 110         .id                     = -1,
 111         .dev                    = {
 112                 .coherent_dma_mask = 0xffffffff,
 113         },
 114         .num_resources          = ARRAY_SIZE(acornfb_resources),
 115         .resource               = acornfb_resources,
 116 };
 117
 118 static struct resource iomd_resources[] = {
 119         DEFINE_RES_MEM(0x03200000, 0x10000),
 120 };
 121
 122 static struct platform_device iomd_device = {
 123         .name                   = "iomd",
 124         .id                     = -1,
 125         .num_resources          = ARRAY_SIZE(iomd_resources),
 126         .resource               = iomd_resources,
 127 };
 128
 129 static struct resource iomd_kart_resources[] = {
 130         DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
 131         DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
 132 };
 133
 134 static struct platform_device kbd_device = {
 135         .name                   = "kart",
 136         .id                     = -1,
 137         .dev                    = {
 138                 .parent         = &iomd_device.dev,
 139         },
 140         .num_resources          = ARRAY_SIZE(iomd_kart_resources),
 141         .resource               = iomd_kart_resources,
 142 };
 143
 144 static struct plat_serial8250_port serial_platform_data[] = {
 145         {
 146                 .mapbase        = 0x03010fe0,
 147                 .irq            = IRQ_SERIALPORT,
 148                 .uartclk        = 1843200,
 149                 .regshift       = 2,
 150                 .iotype         = UPIO_MEM,
 151                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 152         },
 153         { },
 154 };
 155
 156 static struct platform_device serial_device = {
 157         .name                   = "serial8250",
 158         .id                     = PLAT8250_DEV_PLATFORM,
 159         .dev                    = {
 160                 .platform_data  = serial_platform_data,
 161         },
 162 };
 163
 164 static struct pata_platform_info pata_platform_data = {
 165         .ioport_shift           = 2,
 166 };
 167
 168 static struct resource pata_resources[] = {
 169         DEFINE_RES_MEM(0x030107c0, 0x20),
 170         DEFINE_RES_MEM(0x03010fd8, 0x04),
 171         DEFINE_RES_IRQ(IRQ_HARDDISK),
 172 };
 173
 174 static struct platform_device pata_device = {
 175         .name                   = "pata_platform",
 176         .id                     = -1,
 177         .num_resources          = ARRAY_SIZE(pata_resources),
 178         .resource               = pata_resources,
 179         .dev                    = {
 180                 .platform_data  = &pata_platform_data,
 181                 .coherent_dma_mask = ~0,        /* grumble */
 182         },
 183 };
 184
 185 static struct platform_device *devs[] __initdata = {
 186         &iomd_device,
 187         &kbd_device,
 188         &serial_device,
 189         &acornfb_device,
 190         &pata_device,
 191 };
 192
 193 static struct i2c_board_info i2c_rtc = {
 194         I2C_BOARD_INFO("pcf8583", 0x50)
 195 };
 196
 197 static int __init rpc_init(void)
 198 {
 199         i2c_register_board_info(0, &i2c_rtc, 1);
 200         return platform_add_devices(devs, ARRAY_SIZE(devs));
 201 }
 202
 203 arch_initcall(rpc_init);
 204
 205 static void rpc_restart(enum reboot_mode mode, const char *cmd)
 206 {
 207         iomd_writeb(0, IOMD_ROMCR0);
 208
 209         /*
 210          * Jump into the ROM
 211          */
 212         soft_restart(0);
 213 }
 214
 215 void ioc_timer_init(void);
 216
 217 MACHINE_START(RISCPC, "Acorn-RiscPC")
 218         /* Maintainer: Russell King */
 219         .atag_offset    = 0x100,
 220         .reserve_lp0    = 1,
 221         .reserve_lp1    = 1,
 222         .map_io         = rpc_map_io,
 223         .init_irq       = rpc_init_irq,
 224         .init_time      = ioc_timer_init,
 225         .restart        = rpc_restart,
 226 MACHINE_END