arch/arm/mach-s3c24xx/s3c2410.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2410.c
   2  *
   3  * Copyright (c) 2003-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://www.simtec.co.uk/products/EB2410ITX/
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/types.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/list.h>
  17 #include <linux/timer.h>
  18 #include <linux/init.h>
  19 #include <linux/gpio.h>
  20 #include <linux/clk.h>
  21 #include <linux/device.h>
  22 #include <linux/syscore_ops.h>
  23 #include <linux/serial_core.h>
  24 #include <linux/serial_s3c.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/reboot.h>
  27 #include <linux/io.h>
  28
  29 #include <asm/mach/arch.h>
  30 #include <asm/mach/map.h>
  31 #include <asm/mach/irq.h>
  32
  33 #include <mach/hardware.h>
  34 #include <mach/gpio-samsung.h>
  35 #include <asm/irq.h>
  36 #include <asm/system_misc.h>
  37
  38 #include <plat/cpu-freq.h>
  39
  40 #include <mach/regs-clock.h>
  41
  42 #include <plat/cpu.h>
  43 #include <plat/devs.h>
  44 #include <plat/clock.h>
  45 #include <plat/pll.h>
  46 #include <plat/pm.h>
  47 #include <plat/watchdog-reset.h>
  48
  49 #include <plat/gpio-core.h>
  50 #include <plat/gpio-cfg.h>
  51 #include <plat/gpio-cfg-helpers.h>
  52
  53 #include "common.h"
  54
  55 /* Initial IO mappings */
  56
  57 static struct map_desc s3c2410_iodesc[] __initdata = {
  58         IODESC_ENT(CLKPWR),
  59         IODESC_ENT(TIMER),
  60         IODESC_ENT(WATCHDOG),
  61 };
  62
  63 /* our uart devices */
  64
  65 /* uart registration process */
  66
  67 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  68 {
  69         s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
  70 }
  71
  72 /* s3c2410_map_io
  73  *
  74  * register the standard cpu IO areas, and any passed in from the
  75  * machine specific initialisation.
  76 */
  77
  78 void __init s3c2410_map_io(void)
  79 {
  80         s3c24xx_gpiocfg_default.set_pull = s3c24xx_gpio_setpull_1up;
  81         s3c24xx_gpiocfg_default.get_pull = s3c24xx_gpio_getpull_1up;
  82
  83         iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
  84 }
  85
  86 void __init_or_cpufreq s3c2410_setup_clocks(void)
  87 {
  88         struct clk *xtal_clk;
  89         unsigned long tmp;
  90         unsigned long xtal;
  91         unsigned long fclk;
  92         unsigned long hclk;
  93         unsigned long pclk;
  94
  95         xtal_clk = clk_get(NULL, "xtal");
  96         xtal = clk_get_rate(xtal_clk);
  97         clk_put(xtal_clk);
  98
  99         /* now we've got our machine bits initialised, work out what
 100          * clocks we've got */
 101
 102         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
 103
 104         tmp = __raw_readl(S3C2410_CLKDIVN);
 105
 106         /* work out clock scalings */
 107
 108         hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
 109         pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
 110
 111         /* print brieft summary of clocks, etc */
 112
 113         printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 114                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 115
 116         /* initialise the clocks here, to allow other things like the
 117          * console to use them
 118          */
 119
 120         s3c24xx_setup_clocks(fclk, hclk, pclk);
 121 }
 122
 123 /* fake ARMCLK for use with cpufreq, etc. */
 124
 125 static struct clk s3c2410_armclk = {
 126         .name   = "armclk",
 127         .parent = &clk_f,
 128         .id     = -1,
 129 };
 130
 131 static struct clk_lookup s3c2410_clk_lookup[] = {
 132         CLKDEV_INIT(NULL, "clk_uart_baud0", &clk_p),
 133         CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
 134 };
 135
 136 void __init s3c2410_init_clocks(int xtal)
 137 {
 138         s3c24xx_register_baseclocks(xtal);
 139         s3c2410_setup_clocks();
 140         s3c2410_baseclk_add();
 141         s3c24xx_register_clock(&s3c2410_armclk);
 142         clkdev_add_table(s3c2410_clk_lookup, ARRAY_SIZE(s3c2410_clk_lookup));
 143         samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG);
 144 }
 145
 146 struct bus_type s3c2410_subsys = {
 147         .name = "s3c2410-core",
 148         .dev_name = "s3c2410-core",
 149 };
 150
 151 /* Note, we would have liked to name this s3c2410-core, but we cannot
 152  * register two subsystems with the same name.
 153  */
 154 struct bus_type s3c2410a_subsys = {
 155         .name = "s3c2410a-core",
 156         .dev_name = "s3c2410a-core",
 157 };
 158
 159 static struct device s3c2410_dev = {
 160         .bus            = &s3c2410_subsys,
 161 };
 162
 163 /* need to register the subsystem before we actually register the device, and
 164  * we also need to ensure that it has been initialised before any of the
 165  * drivers even try to use it (even if not on an s3c2410 based system)
 166  * as a driver which may support both 2410 and 2440 may try and use it.
 167 */
 168
 169 static int __init s3c2410_core_init(void)
 170 {
 171         return subsys_system_register(&s3c2410_subsys, NULL);
 172 }
 173
 174 core_initcall(s3c2410_core_init);
 175
 176 static int __init s3c2410a_core_init(void)
 177 {
 178         return subsys_system_register(&s3c2410a_subsys, NULL);
 179 }
 180
 181 core_initcall(s3c2410a_core_init);
 182
 183 int __init s3c2410_init(void)
 184 {
 185         printk("S3C2410: Initialising architecture\n");
 186
 187 #ifdef CONFIG_PM
 188         register_syscore_ops(&s3c2410_pm_syscore_ops);
 189         register_syscore_ops(&s3c24xx_irq_syscore_ops);
 190 #endif
 191
 192         return device_register(&s3c2410_dev);
 193 }
 194
 195 int __init s3c2410a_init(void)
 196 {
 197         s3c2410_dev.bus = &s3c2410a_subsys;
 198         return s3c2410_init();
 199 }
 200
 201 void s3c2410_restart(enum reboot_mode mode, const char *cmd)
 202 {
 203         if (mode == REBOOT_SOFT) {
 204                 soft_restart(0);
 205         }
 206
 207         samsung_wdt_reset();
 208
 209         /* we'll take a jump through zero as a poor second */
 210         soft_restart(0);
 211 }