arch/arm/plat-samsung/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
  32 static struct cpu_table *cpu;
  33
  34 static 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 & tab->idmask))
  40                         return tab;
  41         }
  42
  43         return NULL;
  44 }
  45
  46 void __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->init == NULL) {
  59                 printk(KERN_ERR "CPU %s support not enabled\n", cpu->name);
  60                 panic("Unsupported Samsung CPU");
  61         }
  62
  63         if (cpu->map_io)
  64                 cpu->map_io();
  65 }
  66
  67 /* s3c24xx_init_clocks
  68  *
  69  * Initialise the clock subsystem and associated information from the
  70  * given master crystal value.
  71  *
  72  * xtal  = 0 -> use default PLL crystal value (normally 12MHz)
  73  *      != 0 -> PLL crystal value in Hz
  74 */
  75
  76 void __init s3c24xx_init_clocks(int xtal)
  77 {
  78         if (xtal == 0)
  79                 xtal = 12*1000*1000;
  80
  81         if (cpu == NULL)
  82                 panic("s3c24xx_init_clocks: no cpu setup?\n");
  83
  84         if (cpu->init_clocks == NULL)
  85                 panic("s3c24xx_init_clocks: cpu has no clock init\n");
  86         else
  87                 (cpu->init_clocks)(xtal);
  88 }
  89
  90 /* uart management */
  91 #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
  92 static int nr_uarts __initdata = 0;
  93
  94 static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
  95
  96 /* s3c24xx_init_uartdevs
  97  *
  98  * copy the specified platform data and configuration into our central
  99  * set of devices, before the data is thrown away after the init process.
 100  *
 101  * This also fills in the array passed to the serial driver for the
 102  * early initialisation of the console.
 103 */
 104
 105 void __init s3c24xx_init_uartdevs(char *name,
 106                                   struct s3c24xx_uart_resources *res,
 107                                   struct s3c2410_uartcfg *cfg, int no)
 108 {
 109         struct platform_device *platdev;
 110         struct s3c2410_uartcfg *cfgptr = uart_cfgs;
 111         struct s3c24xx_uart_resources *resp;
 112         int uart;
 113
 114         memcpy(cfgptr, cfg, sizeof(struct s3c2410_uartcfg) * no);
 115
 116         for (uart = 0; uart < no; uart++, cfg++, cfgptr++) {
 117                 platdev = s3c24xx_uart_src[cfgptr->hwport];
 118
 119                 resp = res + cfgptr->hwport;
 120
 121                 s3c24xx_uart_devs[uart] = platdev;
 122
 123                 platdev->name = name;
 124                 platdev->resource = resp->resources;
 125                 platdev->num_resources = resp->nr_resources;
 126
 127                 platdev->dev.platform_data = cfgptr;
 128         }
 129
 130         nr_uarts = no;
 131 }
 132
 133 void __init s3c24xx_init_uarts(struct s3c2410_uartcfg *cfg, int no)
 134 {
 135         if (cpu == NULL)
 136                 return;
 137
 138         if (cpu->init_uarts == NULL && IS_ENABLED(CONFIG_SAMSUNG_ATAGS)) {
 139                 printk(KERN_ERR "s3c24xx_init_uarts: cpu has no uart init\n");
 140         } else
 141                 (cpu->init_uarts)(cfg, no);
 142 }
 143 #endif
 144
 145 static int __init s3c_arch_init(void)
 146 {
 147         int ret;
 148
 149         // do the correct init for cpu
 150
 151         if (cpu == NULL)
 152                 panic("s3c_arch_init: NULL cpu\n");
 153
 154         ret = (cpu->init)();
 155         if (ret != 0)
 156                 return ret;
 157 #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
 158         ret = platform_add_devices(s3c24xx_uart_devs, nr_uarts);
 159 #endif
 160         return ret;
 161 }
 162
 163 arch_initcall(s3c_arch_init);