1/* linux/arch/arm/plat-s3c/init.c 2 * 3 * Copyright (c) 2008 Simtec Electronics 4 * Ben Dooks <ben@simtec.co.uk> 5 * http://armlinux.simtec.co.uk/ 6 * 7 * S3C series CPU initialisation 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License version 2 as 11 * published by the Free Software Foundation. 12*/ 13 14#include <linux/init.h> 15#include <linux/module.h> 16#include <linux/interrupt.h> 17#include <linux/ioport.h> 18#include <linux/serial_core.h> 19#include <linux/platform_device.h> 20 21#include <mach/hardware.h> 22 23#include <asm/mach/arch.h> 24#include <asm/mach/map.h> 25 26#include <plat/cpu.h> 27#include <plat/devs.h> 28#include <plat/clock.h> 29 30#include <plat/regs-serial.h> 31 32static struct cpu_table *cpu; 33 34static struct cpu_table * __init s3c_lookup_cpu(unsigned long idcode, 35 struct cpu_table *tab, 36 unsigned int count) 37{ 38 for (; count != 0; count--, tab++) { 39 if ((idcode & tab->idmask) == tab->idcode) 40 return tab; 41 } 42 43 return NULL; 44} 45 46void __init s3c_init_cpu(unsigned long idcode, 47 struct cpu_table *cputab, unsigned int cputab_size) 48{ 49 cpu = s3c_lookup_cpu(idcode, cputab, cputab_size); 50 51 if (cpu == NULL) { 52 printk(KERN_ERR "Unknown CPU type 0x%08lx\n", idcode); 53 panic("Unknown S3C24XX CPU"); 54 } 55 56 printk("CPU %s (id 0x%08lx)\n", cpu->name, idcode); 57 58 if (cpu->map_io == NULL || cpu->init == NULL) { 59 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name); 60 panic("Unsupported Samsung CPU"); 61 } 62 63 cpu->map_io(); 64} 65 66/* s3c24xx_init_clocks 67 * 68 * Initialise the clock subsystem and associated information from the 69 * given master crystal value. 70 * 71 * xtal = 0 -> use default PLL crystal value (normally 12MHz) 72 * != 0 -> PLL crystal value in Hz 73*/ 74 75void __init s3c24xx_init_clocks(int xtal) 76{ 77 if (xtal == 0) 78 xtal = 12*1000*1000; 79 80 if (cpu == NULL) 81 panic("s3c24xx_init_clocks: no cpu setup?\n"); 82 83 if (cpu->init_clocks == NULL) 84 panic("s3c24xx_init_clocks: cpu has no clock init\n"); 85 else 86 (cpu->init_clocks)(xtal); 87} 88 89/* uart management */ 90 91static int nr_uarts __initdata = 0; 92 93static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS]; 94 95/* s3c24xx_init_uartdevs 96 * 97 * copy the specified platform data and configuration into our central 98 * set of devices, before the data is thrown away after the init process. 99 * 100 * This also fills in the array passed to the serial driver for the 101 * early initialisation of the console. 102*/ 103 104void __init s3c24xx_init_uartdevs(char *name, 105 struct s3c24xx_uart_resources *res, 106 struct s3c2410_uartcfg *cfg, int no) 107{ 108 struct platform_device *platdev; 109 struct s3c2410_uartcfg *cfgptr = uart_cfgs; 110 struct s3c24xx_uart_resources *resp; 111 int uart; 112 113 memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no); 114 115 for (uart = 0; uart < no; uart++, cfg++, cfgptr++) { 116 platdev = s3c24xx_uart_src[cfgptr->hwport]; 117 118 resp = res + cfgptr->hwport; 119 120 s3c24xx_uart_devs[uart] = platdev; 121 122 platdev->name = name; 123 platdev->resource = resp->resources; 124 platdev->num_resources = resp->nr_resources; 125 126 platdev->dev.platform_data = cfgptr; 127 } 128 129 nr_uarts = no; 130} 131 132void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no) 133{ 134 if (cpu == NULL) 135 return; 136 137 if (cpu->init_uarts == NULL) { 138 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n"); 139 } else 140 (cpu->init_uarts)(cfg, no); 141} 142 143static int __init s3c_arch_init(void) 144{ 145 int ret; 146 147 // do the correct init for cpu 148 149 if (cpu == NULL) 150 panic("s3c_arch_init: NULL cpu\n"); 151 152 ret = (cpu->init)(); 153 if (ret != 0) 154 return ret; 155 156 ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts); 157 return ret; 158} 159 160arch_initcall(s3c_arch_init); 161