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 224