arch/arm/mach-rpc/riscpc.c

   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
  35 extern void rpc_init_irq(void);
  36
  37 unsigned int vram_size;
  38 unsigned int memc_ctrl_reg;
  39 unsigned int number_mfm_drives;
  40
  41 static 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
  67 static 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
  86 static 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
 101 static struct resource acornfb_resources[] = {
 102         /* VIDC */
 103         DEFINE_RES_MEM(0x03400000, 0x00200000),
 104         DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
 105 };
 106
 107 static 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
 117 static struct resource iomd_resources[] = {
 118         DEFINE_RES_MEM(0x03200000, 0x10000),
 119 };
 120
 121 static struct platform_device iomd_device = {
 122         .name                   = "iomd",
 123         .id                     = -1,
 124         .num_resources          = ARRAY_SIZE(iomd_resources),
 125         .resource               = iomd_resources,
 126 };
 127
 128 static struct resource iomd_kart_resources[] = {
 129         DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
 130         DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
 131 };
 132
 133 static 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
 143 static 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
 155 static struct platform_device serial_device = {
 156         .name                   = "serial8250",
 157         .id                     = PLAT8250_DEV_PLATFORM,
 158         .dev                    = {
 159                 .platform_data  = serial_platform_data,
 160         },
 161 };
 162
 163 static struct pata_platform_info pata_platform_data = {
 164         .ioport_shift           = 2,
 165 };
 166
 167 static struct resource pata_resources[] = {
 168         DEFINE_RES_MEM(0x030107c0, 0x20),
 169         DEFINE_RES_MEM(0x03010fd8, 0x04),
 170         DEFINE_RES_IRQ(IRQ_HARDDISK),
 171 };
 172
 173 static 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
 184 static struct platform_device *devs[] __initdata = {
 185         &iomd_device,
 186         &kbd_device,
 187         &serial_device,
 188         &acornfb_device,
 189         &pata_device,
 190 };
 191
 192 static struct i2c_board_info i2c_rtc = {
 193         I2C_BOARD_INFO("pcf8583", 0x50)
 194 };
 195
 196 static 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
 202 arch_initcall(rpc_init);
 203
 204 static 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
 214 void ioc_timer_init(void);
 215
 216 MACHINE_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,
 225 MACHINE_END