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         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         DEFINE_RES_MEM(0x03400000, 0x00200000),
 103         DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
 104 };
 105
 106 static struct platform_device acornfb_device = {
 107         .name                   = "acornfb",
 108         .id                     = -1,
 109         .dev                    = {
 110                 .coherent_dma_mask = 0xffffffff,
 111         },
 112         .num_resources          = ARRAY_SIZE(acornfb_resources),
 113         .resource               = acornfb_resources,
 114 };
 115
 116 static struct resource iomd_resources[] = {
 117         DEFINE_RES_MEM(0x03200000, 0x10000),
 118 };
 119
 120 static struct platform_device iomd_device = {
 121         .name                   = "iomd",
 122         .id                     = -1,
 123         .num_resources          = ARRAY_SIZE(iomd_resources),
 124         .resource               = iomd_resources,
 125 };
 126
 127 static struct resource iomd_kart_resources[] = {
 128         DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
 129         DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
 130 };
 131
 132 static struct platform_device kbd_device = {
 133         .name                   = "kart",
 134         .id                     = -1,
 135         .dev                    = {
 136                 .parent         = &iomd_device.dev,
 137         },
 138         .num_resources          = ARRAY_SIZE(iomd_kart_resources),
 139         .resource               = iomd_kart_resources,
 140 };
 141
 142 static struct plat_serial8250_port serial_platform_data[] = {
 143         {
 144                 .mapbase        = 0x03010fe0,
 145                 .irq            = IRQ_SERIALPORT,
 146                 .uartclk        = 1843200,
 147                 .regshift       = 2,
 148                 .iotype         = UPIO_MEM,
 149                 .flags          = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
 150         },
 151         { },
 152 };
 153
 154 static struct platform_device serial_device = {
 155         .name                   = "serial8250",
 156         .id                     = PLAT8250_DEV_PLATFORM,
 157         .dev                    = {
 158                 .platform_data  = serial_platform_data,
 159         },
 160 };
 161
 162 static struct pata_platform_info pata_platform_data = {
 163         .ioport_shift           = 2,
 164 };
 165
 166 static struct resource pata_resources[] = {
 167         DEFINE_RES_MEM(0x030107c0, 0x20),
 168         DEFINE_RES_MEM(0x03010fd8, 0x04),
 169         DEFINE_RES_IRQ(IRQ_HARDDISK),
 170 };
 171
 172 static struct platform_device pata_device = {
 173         .name                   = "pata_platform",
 174         .id                     = -1,
 175         .num_resources          = ARRAY_SIZE(pata_resources),
 176         .resource               = pata_resources,
 177         .dev                    = {
 178                 .platform_data  = &pata_platform_data,
 179                 .coherent_dma_mask = ~0,        /* grumble */
 180         },
 181 };
 182
 183 static struct platform_device *devs[] __initdata = {
 184         &iomd_device,
 185         &kbd_device,
 186         &serial_device,
 187         &acornfb_device,
 188         &pata_device,
 189 };
 190
 191 static struct i2c_board_info i2c_rtc = {
 192         I2C_BOARD_INFO("pcf8583", 0x50)
 193 };
 194
 195 static int __init rpc_init(void)
 196 {
 197         i2c_register_board_info(0, &i2c_rtc, 1);
 198         return platform_add_devices(devs, ARRAY_SIZE(devs));
 199 }
 200
 201 arch_initcall(rpc_init);
 202
 203 static void rpc_restart(enum reboot_mode mode, const char *cmd)
 204 {
 205         iomd_writeb(0, IOMD_ROMCR0);
 206
 207         /*
 208          * Jump into the ROM
 209          */
 210         soft_restart(0);
 211 }
 212
 213 void ioc_timer_init(void);
 214
 215 MACHINE_START(RISCPC, "Acorn-RiscPC")
 216         /* Maintainer: Russell King */
 217         .atag_offset    = 0x100,
 218         .reserve_lp0    = 1,
 219         .reserve_lp1    = 1,
 220         .map_io         = rpc_map_io,
 221         .init_irq       = rpc_init_irq,
 222         .init_time      = ioc_timer_init,
 223         .restart        = rpc_restart,
 224 MACHINE_END