arm/mach-rpc/riscpc.c

0001 // SPDX-License-Identifier: GPL-2.0-only
0002 /*
0003  *  linux/arch/arm/mach-rpc/riscpc.c
0004  *
0005  *  Copyright (C) 1998-2001 Russell King
0006  *
0007  *  Architecture specific fixups.
0008  */
0009 #include <linux/kernel.h>
0010 #include <linux/tty.h>
0011 #include <linux/delay.h>
0012 #include <linux/pm.h>
0013 #include <linux/init.h>
0014 #include <linux/sched.h>
0015 #include <linux/device.h>
0016 #include <linux/serial_8250.h>
0017 #include <linux/ata_platform.h>
0018 #include <linux/io.h>
0019 #include <linux/i2c.h>
0020 #include <linux/reboot.h>
0021
0022 #include <asm/elf.h>
0023 #include <asm/mach-types.h>
0024 #include <mach/hardware.h>
0025 #include <asm/hardware/iomd.h>
0026 #include <asm/page.h>
0027 #include <asm/domain.h>
0028 #include <asm/setup.h>
0029 #include <asm/system_misc.h>
0030
0031 #include <asm/mach/map.h>
0032 #include <asm/mach/arch.h>
0033 #include <asm/mach/time.h>
0034
0035 extern void rpc_init_irq(void);
0036
0037 unsigned int vram_size;
0038 unsigned int memc_ctrl_reg;
0039 unsigned int number_mfm_drives;
0040
0041 static int __init parse_tag_acorn(const struct tag *tag)
0042 {
0043     memc_ctrl_reg = tag->u.acorn.memc_control_reg;
0044     number_mfm_drives = tag->u.acorn.adfsdrives;
0045
0046     switch (tag->u.acorn.vram_pages) {
0047     case 512:
0048         vram_size += PAGE_SIZE * 256;
0049         fallthrough;    /* ??? */
0050     case 256:
0051         vram_size += PAGE_SIZE * 256;
0052         break;
0053     default:
0054         break;
0055     }
0056 #if 0
0057     if (vram_size) {
0058         desc->video_start = 0x02000000;
0059         desc->video_end   = 0x02000000 + vram_size;
0060     }
0061 #endif
0062     return 0;
0063 }
0064
0065 __tagtable(ATAG_ACORN, parse_tag_acorn);
0066
0067 static struct map_desc rpc_io_desc[] __initdata = {
0068     {   /* VRAM     */
0069         .virtual    =  SCREEN_BASE,
0070         .pfn        = __phys_to_pfn(SCREEN_START),
0071         .length     =   2*1048576,
0072         .type       = MT_DEVICE
0073     }, {    /* IO space */
0074         .virtual    =  (u32)IO_BASE,
0075         .pfn        = __phys_to_pfn(IO_START),
0076         .length     =   IO_SIZE  ,
0077         .type       = MT_DEVICE
0078     }, {    /* EASI space   */
0079         .virtual    = (unsigned long)EASI_BASE,
0080         .pfn        = __phys_to_pfn(EASI_START),
0081         .length     = EASI_SIZE,
0082         .type       = MT_DEVICE
0083     }
0084 };
0085
0086 static void __init rpc_map_io(void)
0087 {
0088     iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc));
0089
0090     /*
0091      * Turn off floppy.
0092      */
0093     writeb(0xc, PCIO_BASE + (0x3f2 << 2));
0094
0095     /*
0096      * RiscPC can't handle half-word loads and stores
0097      */
0098     elf_hwcap &= ~HWCAP_HALF;
0099 }
0100
0101 static struct resource acornfb_resources[] = {
0102     /* VIDC */
0103     DEFINE_RES_MEM(0x03400000, 0x00200000),
0104     DEFINE_RES_IRQ(IRQ_VSYNCPULSE),
0105 };
0106
0107 static struct platform_device acornfb_device = {
0108     .name           = "acornfb",
0109     .id         = -1,
0110     .dev            = {
0111         .coherent_dma_mask = 0xffffffff,
0112     },
0113     .num_resources      = ARRAY_SIZE(acornfb_resources),
0114     .resource       = acornfb_resources,
0115 };
0116
0117 static struct resource iomd_resources[] = {
0118     DEFINE_RES_MEM(0x03200000, 0x10000),
0119 };
0120
0121 static struct platform_device iomd_device = {
0122     .name           = "iomd",
0123     .id         = -1,
0124     .num_resources      = ARRAY_SIZE(iomd_resources),
0125     .resource       = iomd_resources,
0126 };
0127
0128 static struct resource iomd_kart_resources[] = {
0129     DEFINE_RES_IRQ(IRQ_KEYBOARDRX),
0130     DEFINE_RES_IRQ(IRQ_KEYBOARDTX),
0131 };
0132
0133 static struct platform_device kbd_device = {
0134     .name           = "kart",
0135     .id         = -1,
0136     .dev            = {
0137         .parent     = &iomd_device.dev,
0138     },
0139     .num_resources      = ARRAY_SIZE(iomd_kart_resources),
0140     .resource       = iomd_kart_resources,
0141 };
0142
0143 static struct plat_serial8250_port serial_platform_data[] = {
0144     {
0145         .mapbase    = 0x03010fe0,
0146         .irq        = IRQ_SERIALPORT,
0147         .uartclk    = 1843200,
0148         .regshift   = 2,
0149         .iotype     = UPIO_MEM,
0150         .flags      = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST,
0151     },
0152     { },
0153 };
0154
0155 static struct platform_device serial_device = {
0156     .name           = "serial8250",
0157     .id         = PLAT8250_DEV_PLATFORM,
0158     .dev            = {
0159         .platform_data  = serial_platform_data,
0160     },
0161 };
0162
0163 static struct pata_platform_info pata_platform_data = {
0164     .ioport_shift       = 2,
0165 };
0166
0167 static struct resource pata_resources[] = {
0168     DEFINE_RES_MEM(0x030107c0, 0x20),
0169     DEFINE_RES_MEM(0x03010fd8, 0x04),
0170     DEFINE_RES_IRQ(IRQ_HARDDISK),
0171 };
0172
0173 static struct platform_device pata_device = {
0174     .name           = "pata_platform",
0175     .id         = -1,
0176     .num_resources      = ARRAY_SIZE(pata_resources),
0177     .resource       = pata_resources,
0178     .dev            = {
0179         .platform_data  = &pata_platform_data,
0180         .coherent_dma_mask = ~0,    /* grumble */
0181     },
0182 };
0183
0184 static struct platform_device *devs[] __initdata = {
0185     &iomd_device,
0186     &kbd_device,
0187     &serial_device,
0188     &acornfb_device,
0189     &pata_device,
0190 };
0191
0192 static struct i2c_board_info i2c_rtc = {
0193     I2C_BOARD_INFO("pcf8583", 0x50)
0194 };
0195
0196 static int __init rpc_init(void)
0197 {
0198     i2c_register_board_info(0, &i2c_rtc, 1);
0199     return platform_add_devices(devs, ARRAY_SIZE(devs));
0200 }
0201
0202 arch_initcall(rpc_init);
0203
0204 static void rpc_restart(enum reboot_mode mode, const char *cmd)
0205 {
0206     iomd_writeb(0, IOMD_ROMCR0);
0207
0208     /*
0209      * Jump into the ROM
0210      */
0211     soft_restart(0);
0212 }
0213
0214 void ioc_timer_init(void);
0215
0216 MACHINE_START(RISCPC, "Acorn-RiscPC")
0217     /* Maintainer: Russell King */
0218     .atag_offset    = 0x100,
0219     .reserve_lp0    = 1,
0220     .reserve_lp1    = 1,
0221     .map_io     = rpc_map_io,
0222     .init_irq   = rpc_init_irq,
0223     .init_time  = ioc_timer_init,
0224     .restart    = rpc_restart,
0225 MACHINE_END