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 225