LXR linux/arch/arm/plat-s3c/init.c

   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