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