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 226