1 /* 2 * linux/arch/arm/mach-rpc/riscpc.c 3 * 4 * Copyright (C) 1998-2001 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * Architecture specific fixups. 11 */ 12 #include <linux/kernel.h> 13 #include <linux/tty.h> 14 #include <linux/delay.h> 15 #include <linux/pm.h> 16 #include <linux/init.h> 17 #include <linux/sched.h> 18 #include <linux/device.h> 19 #include <linux/serial_8250.h> 20 21 #include <asm/elf.h> 22 #include <asm/io.h> 23 #include <asm/mach-types.h> 24 #include <asm/hardware.h> 25 #include <asm/page.h> 26 #include <asm/domain.h> 27 #include <asm/setup.h> 28 29 #include <asm/mach/map.h> 30 #include <asm/mach/arch.h> 31 #include <asm/mach/time.h> 32 33 extern void rpc_init_irq(void); 34 35 unsigned int vram_size; 36 unsigned int memc_ctrl_reg; 37 unsigned int number_mfm_drives; 38 39 static int __init parse_tag_acorn(const struct tag *tag) 40 { 41 memc_ctrl_reg = tag->u.acorn.memc_control_reg; 42 number_mfm_drives = tag->u.acorn.adfsdrives; 43 44 switch (tag->u.acorn.vram_pages) { 45 case 512: 46 vram_size += PAGE_SIZE * 256; 47 case 256: 48 vram_size += PAGE_SIZE * 256; 49 default: 50 break; 51 } 52 #if 0 53 if (vram_size) { 54 desc->video_start = 0x02000000; 55 desc->video_end = 0x02000000 + vram_size; 56 } 57 #endif 58 return 0; 59 } 60 61 __tagtable(ATAG_ACORN, parse_tag_acorn); 62 63 static struct map_desc rpc_io_desc[] __initdata = { 64 { SCREEN_BASE, SCREEN_START, 2*1048576, MT_DEVICE }, /* VRAM */ 65 { (u32)IO_BASE, IO_START, IO_SIZE , MT_DEVICE }, /* IO space */ 66 { EASI_BASE, EASI_START, EASI_SIZE, MT_DEVICE } /* EASI space */ 67 }; 68 69 static void __init rpc_map_io(void) 70 { 71 iotable_init(rpc_io_desc, ARRAY_SIZE(rpc_io_desc)); 72 73 /* 74 * Turn off floppy. 75 */ 76 outb(0xc, 0x3f2); 77 78 /* 79 * RiscPC can't handle half-word loads and stores 80 */ 81 elf_hwcap &= ~HWCAP_HALF; 82 } 83 84 static struct resource acornfb_resources[] = { 85 { /* VIDC */ 86 .start = 0x03400000, 87 .end = 0x035fffff, 88 .flags = IORESOURCE_MEM, 89 }, { 90 .start = IRQ_VSYNCPULSE, 91 .end = IRQ_VSYNCPULSE, 92 .flags = IORESOURCE_IRQ, 93 }, 94 }; 95 96 static struct platform_device acornfb_device = { 97 .name = "acornfb", 98 .id = -1, 99 .dev = { 100 .coherent_dma_mask = 0xffffffff, 101 }, 102 .num_resources = ARRAY_SIZE(acornfb_resources), 103 .resource = acornfb_resources, 104 }; 105 106 static struct resource iomd_resources[] = { 107 { 108 .start = 0x03200000, 109 .end = 0x0320ffff, 110 .flags = IORESOURCE_MEM, 111 }, 112 }; 113 114 static struct platform_device iomd_device = { 115 .name = "iomd", 116 .id = -1, 117 .num_resources = ARRAY_SIZE(iomd_resources), 118 .resource = iomd_resources, 119 }; 120 121 static struct platform_device kbd_device = { 122 .name = "kart", 123 .id = -1, 124 .dev = { 125 .parent = &iomd_device.dev, 126 }, 127 }; 128 129 static struct plat_serial8250_port serial_platform_data[] = { 130 { 131 .mapbase = 0x03010fe0, 132 .irq = 10, 133 .uartclk = 1843200, 134 .regshift = 2, 135 .iotype = UPIO_MEM, 136 .flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP | UPF_SKIP_TEST, 137 }, 138 { }, 139 }; 140 141 static struct platform_device serial_device = { 142 .name = "serial8250", 143 .id = 0, 144 .dev = { 145 .platform_data = serial_platform_data, 146 }, 147 }; 148 149 static struct platform_device *devs[] __initdata = { 150 &iomd_device, 151 &kbd_device, 152 &serial_device, 153 &acornfb_device, 154 }; 155 156 static int __init rpc_init(void) 157 { 158 return platform_add_devices(devs, ARRAY_SIZE(devs)); 159 } 160 161 arch_initcall(rpc_init); 162 163 extern struct sys_timer ioc_timer; 164 165 MACHINE_START(RISCPC, "Acorn-RiscPC") 166 /* Maintainer: Russell King */ 167 .phys_ram = 0x10000000, 168 .phys_io = 0x03000000, 169 .io_pg_offst = ((0xe0000000) >> 18) & 0xfffc, 170 .boot_params = 0x10000100, 171 .reserve_lp0 = 1, 172 .reserve_lp1 = 1, 173 .map_io = rpc_map_io, 174 .init_irq = rpc_init_irq, 175 .timer = &ioc_timer, 176 MACHINE_END 177