linux/arch/arm/mach-rpc/riscpc.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/arch/arm/mach-rpc/riscpc.c
   4 *
   5 *  Copyright (C) 1998-2001 Russell King
   6 *
   7 *  Architecture specific fixups.
   8 */
   9#include <linux/kernel.h>
  10#include <linux/tty.h>
  11#include <linux/delay.h>
  12#include <linux/pm.h>
  13#include <linux/init.h>
  14#include <linux/sched.h>
  15#include <linux/device.h>
  16#include <linux/serial_8250.h>
  17#include <linux/ata_platform.h>
  18#include <linux/io.h>
  19#include <linux/i2c.h>
  20#include <linux/reboot.h>
  21
  22#include <asm/elf.h>
  23#include <asm/mach-types.h>
  24#include <mach/hardware.h>
  25#include <asm/hardware/iomd.h>
  26#include <asm/page.h>
  27#include <asm/domain.h>
  28#include <asm/setup.h>
  29#include <asm/system_misc.h>
  30
  31#include <asm/mach/map.h>
  32#include <asm/mach/arch.h>
  33#include <asm/mach/time.h>
  34
  35extern void rpc_init_irq(void);
  36
  37unsigned int vram_size;
  38unsigned int memc_ctrl_reg;
  39unsigned int number_mfm_drives;
  40
  41static int __init parse_tag_acorn(const struct tag *tag)
  42{
  43        memc_ctrl_reg = tag->u.acorn.memc_control_reg;
  44        number_mfm_drives = tag->u.acorn.adfsdrives;
  45
  46        switch (tag->u.acorn.vram_pages) {
  47        case 512:
  48                vram_size += PAGE_SIZE * 256;
  49                fallthrough;    /* ??? */
  50        case 256:
  51                vram_size += PAGE_SIZE * 256;
  52                break;
  53        default:
  54                break;
  55        }
  56#if 0
  57        if (vram_size) {
  58                desc->video_start = 0x02000000;
  59                desc->video_end   = 0x02000000 + vram_size;
  60        }
  61#endif
  62        return 0;
  63}
  64
  65__tagtable(ATAG_ACORN, parse_tag_acorn);
  66
  67static struct map_desc rpc_io_desc[] __initdata = {
  68        {       /* VRAM         */
  69                .virtual        =  SCREEN_BASE,
  70                .pfn            = __phys_to_pfn(SCREEN_START),
  71                .length         =       2*1048576,
  72                .type           = MT_DEVICE
  73        }, {    /* IO space     */
  74                .virtual        =  (u32)IO_BASE,
  75                .pfn            = __phys_to_pfn(IO_START),
  76                .length         =       IO_SIZE  ,
  77                .type           = MT_DEVICE
  78        }, {    /* EASI space   */
  79                .virtual        = (unsigned long)EASI_BASE,
  80                .pfn            = __phys_to_pfn(EASI_START),
  81                .length         = EASI_SIZE,
  82                .type           = MT_DEVICE
  83        }
  84};
  85
  86static void __init rpc_map_io(void)
  87{
  88        iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
  89
  90        /*
  91         * Turn off floppy.
  92         */
  93        writeb(0xc, PCIO_BASE + (0x3f2 << 2));
  94
  95        /*
  96         * RiscPC can't handle half-word loads and stores
  97         */
  98        elf_hwcap &= ~HWCAP_HALF;
  99}
 100
 101static struct resource acornfb_resources[] = {
 102        /* VIDC */
 103        DEFINE_RES_MEM(0x03400000, 0x00200000),
 104        DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
 105};
 106
 107static struct platform_device acornfb_device = {
 108        .name                   = "acornfb",
 109        .id                     = -1,
 110        .dev                    = {
 111                .coherent_dma_mask = 0xffffffff,
 112        },
 113        .num_resources          = ARRAY_SIZE(acornfb_resources),
 114        .resource               = acornfb_resources,
 115};
 116
 117static struct resource iomd_resources[] = {
 118        DEFINE_RES_MEM(0x03200000, 0x10000),
 119};
 120
 121static struct platform_device iomd_device = {
 122        .name                   = "iomd",
 123        .id                     = -1,
 124        .num_resources          = ARRAY_SIZE(iomd_resources),
 125        .resource               = iomd_resources,
 126};
 127
 128static struct resource iomd_kart_resources[] = {
 129        DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
 130        DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
 131};
 132
 133static struct platform_device kbd_device = {
 134        .name                   = "kart",
 135        .id                     = -1,
 136        .dev                    = {
 137                .parent         = &iomd_device.dev,
 138        },
 139        .num_resources          = ARRAY_SIZE(iomd_kart_resources),
 140        .resource               = iomd_kart_resources,
 141};
 142
 143static struct plat_serial8250_port serial_platform_data[] = {
 144        {
 145                .mapbase        = 0x03010fe0,
 146                .irq            = IRQ_SERIALPORT,
 147                .uartclk        = 1843200,
 148                .regshift       = 2,
 149                .iotype         = UPIO_MEM,
 150                .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 151        },
 152        { },
 153};
 154
 155static struct platform_device serial_device = {
 156        .name                   = "serial8250",
 157        .id                     = PLAT8250_DEV_PLATFORM,
 158        .dev                    = {
 159                .platform_data  = serial_platform_data,
 160        },
 161};
 162
 163static struct pata_platform_info pata_platform_data = {
 164        .ioport_shift           = 2,
 165};
 166
 167static struct resource pata_resources[] = {
 168        DEFINE_RES_MEM(0x030107c0, 0x20),
 169        DEFINE_RES_MEM(0x03010fd8, 0x04),
 170        DEFINE_RES_IRQ(IRQ_HARDDISK),
 171};
 172
 173static struct platform_device pata_device = {
 174        .name                   = "pata_platform",
 175        .id                     = -1,
 176        .num_resources          = ARRAY_SIZE(pata_resources),
 177        .resource               = pata_resources,
 178        .dev                    = {
 179                .platform_data  = &pata_platform_data,
 180                .coherent_dma_mask = ~0,        /* grumble */
 181        },
 182};
 183
 184static struct platform_device *devs[] __initdata = {
 185        &iomd_device,
 186        &kbd_device,
 187        &serial_device,
 188        &acornfb_device,
 189        &pata_device,
 190};
 191
 192static struct i2c_board_info i2c_rtc = {
 193        I2C_BOARD_INFO("pcf8583", 0x50)
 194};
 195
 196static int __init rpc_init(void)
 197{
 198        i2c_register_board_info(0, &i2c_rtc, 1);
 199        return platform_add_devices(devs, ARRAY_SIZE(devs));
 200}
 201
 202arch_initcall(rpc_init);
 203
 204static void rpc_restart(enum reboot_mode mode, const char *cmd)
 205{
 206        iomd_writeb(0, IOMD_ROMCR0);
 207
 208        /*
 209         * Jump into the ROM
 210         */
 211        soft_restart(0);
 212}
 213
 214void ioc_timer_init(void);
 215
 216MACHINE_START(RISCPC, "Acorn-RiscPC")
 217        /* Maintainer: Russell King */
 218        .atag_offset    = 0x100,
 219        .reserve_lp0    = 1,
 220        .reserve_lp1    = 1,
 221        .map_io         = rpc_map_io,
 222        .init_irq       = rpc_init_irq,
 223        .init_time      = ioc_timer_init,
 224        .restart        = rpc_restart,
 225MACHINE_END
 226