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