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
  24 #include <asm/elf.h>
  25 #include <asm/mach-types.h>
  26 #include <mach/hardware.h>
  27 #include <asm/hardware/iomd.h>
  28 #include <asm/page.h>
  29 #include <asm/domain.h>
  30 #include <asm/setup.h>
  31
  32 #include <asm/mach/map.h>
  33 #include <asm/mach/arch.h>
  34 #include <asm/mach/time.h>
  35
  36 extern void rpc_init_irq(void);
  37
  38 unsigned int vram_size;
  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 static struct map_desc rpc_io_desc[] __initdata = {
  67         {       /* VRAM         */
  68                 .virtual        =  SCREEN_BASE,
  69                 .pfn            = __phys_to_pfn(SCREEN_START),
  70                 .length         =       2*1048576,
  71                 .type           = MT_DEVICE
  72         }, {    /* IO space     */
  73                 .virtual        =  (u32)IO_BASE,
  74                 .pfn            = __phys_to_pfn(IO_START),
  75                 .length         =       IO_SIZE  ,
  76                 .type           = MT_DEVICE
  77         }, {    /* EASI space   */
  78                 .virtual        = (unsigned long)EASI_BASE,
  79                 .pfn            = __phys_to_pfn(EASI_START),
  80                 .length         = EASI_SIZE,
  81                 .type           = MT_DEVICE
  82         }
  83 };
  84
  85 static void __init rpc_map_io(void)
  86 {
  87         iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  88
  89         /*
  90          * Turn off floppy.
  91          */
  92         writeb(0xc, PCIO_BASE + (0x3f2 << 2));
  93
  94         /*
  95          * RiscPC can't handle half-word loads and stores
  96          */
  97         elf_hwcap &= ~HWCAP_HALF;
  98 }
  99
 100 static struct resource acornfb_resources[] = {
 101         {       /* VIDC */
 102                 .start          = 0x03400000,
 103                 .end            = 0x035fffff,
 104                 .flags          = IORESOURCE_MEM,
 105         }, {
 106                 .start          = IRQ_VSYNCPULSE,
 107                 .end            = IRQ_VSYNCPULSE,
 108                 .flags          = IORESOURCE_IRQ,
 109         },
 110 };
 111
 112 static struct platform_device acornfb_device = {
 113         .name                   = "acornfb",
 114         .id                     = -1,
 115         .dev                    = {
 116                 .coherent_dma_mask = 0xffffffff,
 117         },
 118         .num_resources          = ARRAY_SIZE(acornfb_resources),
 119         .resource               = acornfb_resources,
 120 };
 121
 122 static struct resource iomd_resources[] = {
 123         {
 124                 .start          = 0x03200000,
 125                 .end            = 0x0320ffff,
 126                 .flags          = IORESOURCE_MEM,
 127         },
 128 };
 129
 130 static struct platform_device iomd_device = {
 131         .name                   = "iomd",
 132         .id                     = -1,
 133         .num_resources          = ARRAY_SIZE(iomd_resources),
 134         .resource               = iomd_resources,
 135 };
 136
 137 static struct platform_device kbd_device = {
 138         .name                   = "kart",
 139         .id                     = -1,
 140         .dev                    = {
 141                 .parent         = &iomd_device.dev,
 142         },
 143 };
 144
 145 static struct plat_serial8250_port serial_platform_data[] = {
 146         {
 147                 .mapbase        = 0x03010fe0,
 148                 .irq            = 10,
 149                 .uartclk        = 1843200,
 150                 .regshift       = 2,
 151                 .iotype         = UPIO_MEM,
 152                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 153         },
 154         { },
 155 };
 156
 157 static struct platform_device serial_device = {
 158         .name                   = "serial8250",
 159         .id                     = PLAT8250_DEV_PLATFORM,
 160         .dev                    = {
 161                 .platform_data  = serial_platform_data,
 162         },
 163 };
 164
 165 static struct pata_platform_info pata_platform_data = {
 166         .ioport_shift           = 2,
 167 };
 168
 169 static struct resource pata_resources[] = {
 170         [0] = {
 171                 .start          = 0x030107c0,
 172                 .end            = 0x030107df,
 173                 .flags          = IORESOURCE_MEM,
 174         },
 175         [1] = {
 176                 .start          = 0x03010fd8,
 177                 .end            = 0x03010fdb,
 178                 .flags          = IORESOURCE_MEM,
 179         },
 180         [2] = {
 181                 .start          = IRQ_HARDDISK,
 182                 .end            = IRQ_HARDDISK,
 183                 .flags          = IORESOURCE_IRQ,
 184         },
 185 };
 186
 187 static struct platform_device pata_device = {
 188         .name                   = "pata_platform",
 189         .id                     = -1,
 190         .num_resources          = ARRAY_SIZE(pata_resources),
 191         .resource               = pata_resources,
 192         .dev                    = {
 193                 .platform_data  = &pata_platform_data,
 194                 .coherent_dma_mask = ~0,        /* grumble */
 195         },
 196 };
 197
 198 static struct platform_device *devs[] __initdata = {
 199         &iomd_device,
 200         &kbd_device,
 201         &serial_device,
 202         &acornfb_device,
 203         &pata_device,
 204 };
 205
 206 static struct i2c_board_info i2c_rtc = {
 207         I2C_BOARD_INFO("pcf8583", 0x50)
 208 };
 209
 210 static int __init rpc_init(void)
 211 {
 212         i2c_register_board_info(0, &i2c_rtc, 1);
 213         return platform_add_devices(devs, ARRAY_SIZE(devs));
 214 }
 215
 216 arch_initcall(rpc_init);
 217
 218 static void rpc_restart(char mode, const char *cmd)
 219 {
 220         iomd_writeb(0, IOMD_ROMCR0);
 221
 222         /*
 223          * Jump into the ROM
 224          */
 225         soft_restart(0);
 226 }
 227
 228 extern struct sys_timer ioc_timer;
 229
 230 MACHINE_START(RISCPC, "Acorn-RiscPC")
 231         /* Maintainer: Russell King */
 232         .atag_offset    = 0x100,
 233         .reserve_lp0    = 1,
 234         .reserve_lp1    = 1,
 235         .map_io         = rpc_map_io,
 236         .init_irq       = rpc_init_irq,
 237         .timer          = &ioc_timer,
 238         .restart        = rpc_restart,
 239 MACHINE_END