arch/arm/mach-s3c24xx/s3c244x.c

   1 /* linux/arch/arm/plat-s3c24xx/s3c244x.c
   2  *
   3  * Copyright (c) 2004-2006 Simtec Electronics
   4  *   Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * Samsung S3C2440 and S3C2442 Mobile CPU support (not S3C2443)
   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/serial_core.h>
  20 #include <linux/serial_s3c.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/reboot.h>
  23 #include <linux/device.h>
  24 #include <linux/syscore_ops.h>
  25 #include <linux/clk.h>
  26 #include <linux/io.h>
  27
  28 #include <asm/system_misc.h>
  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 <asm/irq.h>
  35
  36 #include <plat/cpu-freq.h>
  37
  38 #include <mach/regs-clock.h>
  39 #include <mach/regs-gpio.h>
  40
  41 #include <plat/clock.h>
  42 #include <plat/devs.h>
  43 #include <plat/cpu.h>
  44 #include <plat/pm.h>
  45 #include <plat/pll.h>
  46 #include <plat/nand-core.h>
  47 #include <plat/watchdog-reset.h>
  48
  49 #include "common.h"
  50 #include "regs-dsc.h"
  51
  52 static struct map_desc s3c244x_iodesc[] __initdata = {
  53         IODESC_ENT(CLKPWR),
  54         IODESC_ENT(TIMER),
  55         IODESC_ENT(WATCHDOG),
  56 };
  57
  58 /* uart initialisation */
  59
  60 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  61 {
  62         s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
  63 }
  64
  65 void __init s3c244x_map_io(void)
  66 {
  67         /* register our io-tables */
  68
  69         iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
  70
  71         /* rename any peripherals used differing from the s3c2410 */
  72
  73         s3c_device_sdi.name  = "s3c2440-sdi";
  74         s3c_device_i2c0.name  = "s3c2440-i2c";
  75         s3c_nand_setname("s3c2440-nand");
  76         s3c_device_ts.name = "s3c2440-ts";
  77         s3c_device_usbgadget.name = "s3c2440-usbgadget";
  78         s3c2410_device_dclk.name = "s3c2440-dclk";
  79 }
  80
  81 #ifdef CONFIG_SAMSUNG_CLOCK
  82 void __init_or_cpufreq s3c244x_setup_clocks(void)
  83 {
  84         struct clk *xtal_clk;
  85         unsigned long clkdiv;
  86         unsigned long camdiv;
  87         unsigned long xtal;
  88         unsigned long hclk, fclk, pclk;
  89         int hdiv = 1;
  90
  91         xtal_clk = clk_get(NULL, "xtal");
  92         xtal = clk_get_rate(xtal_clk);
  93         clk_put(xtal_clk);
  94
  95         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  96
  97         clkdiv = __raw_readl(S3C2410_CLKDIVN);
  98         camdiv = __raw_readl(S3C2440_CAMDIVN);
  99
 100         /* work out clock scalings */
 101
 102         switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
 103         case S3C2440_CLKDIVN_HDIVN_1:
 104                 hdiv = 1;
 105                 break;
 106
 107         case S3C2440_CLKDIVN_HDIVN_2:
 108                 hdiv = 2;
 109                 break;
 110
 111         case S3C2440_CLKDIVN_HDIVN_4_8:
 112                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 113                 break;
 114
 115         case S3C2440_CLKDIVN_HDIVN_3_6:
 116                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
 117                 break;
 118         }
 119
 120         hclk = fclk / hdiv;
 121         pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
 122
 123         /* print brief summary of clocks, etc */
 124
 125         printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 126                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 127
 128         s3c24xx_setup_clocks(fclk, hclk, pclk);
 129 }
 130
 131 void __init s3c244x_init_clocks(int xtal)
 132 {
 133         /* initialise the clocks here, to allow other things like the
 134          * console to use them, and to add new ones after the initialisation
 135          */
 136
 137         s3c24xx_register_baseclocks(xtal);
 138         s3c244x_setup_clocks();
 139         s3c2410_baseclk_add();
 140         samsung_wdt_reset_init(S3C24XX_VA_WATCHDOG);
 141 }
 142 #else
 143 void __init_or_cpufreq s3c244x_setup_clocks(void)
 144 {
 145 }
 146 #endif
 147
 148 /* Since the S3C2442 and S3C2440 share items, put both subsystems here */
 149
 150 struct bus_type s3c2440_subsys = {
 151         .name           = "s3c2440-core",
 152         .dev_name       = "s3c2440-core",
 153 };
 154
 155 struct bus_type s3c2442_subsys = {
 156         .name           = "s3c2442-core",
 157         .dev_name       = "s3c2442-core",
 158 };
 159
 160 /* need to register the subsystem before we actually register the device, and
 161  * we also need to ensure that it has been initialised before any of the
 162  * drivers even try to use it (even if not on an s3c2440 based system)
 163  * as a driver which may support both 2410 and 2440 may try and use it.
 164 */
 165
 166 static int __init s3c2440_core_init(void)
 167 {
 168         return subsys_system_register(&s3c2440_subsys, NULL);
 169 }
 170
 171 core_initcall(s3c2440_core_init);
 172
 173 static int __init s3c2442_core_init(void)
 174 {
 175         return subsys_system_register(&s3c2442_subsys, NULL);
 176 }
 177
 178 core_initcall(s3c2442_core_init);
 179
 180
 181 #ifdef CONFIG_PM
 182 static struct sleep_save s3c244x_sleep[] = {
 183         SAVE_ITEM(S3C2440_DSC0),
 184         SAVE_ITEM(S3C2440_DSC1),
 185         SAVE_ITEM(S3C2440_GPJDAT),
 186         SAVE_ITEM(S3C2440_GPJCON),
 187         SAVE_ITEM(S3C2440_GPJUP)
 188 };
 189
 190 static int s3c244x_suspend(void)
 191 {
 192         s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 193         return 0;
 194 }
 195
 196 static void s3c244x_resume(void)
 197 {
 198         s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 199 }
 200 #else
 201 #define s3c244x_suspend NULL
 202 #define s3c244x_resume  NULL
 203 #endif
 204
 205 struct syscore_ops s3c244x_pm_syscore_ops = {
 206         .suspend        = s3c244x_suspend,
 207         .resume         = s3c244x_resume,
 208 };
 209
 210 void s3c244x_restart(enum reboot_mode mode, const char *cmd)
 211 {
 212         if (mode == REBOOT_SOFT)
 213                 soft_restart(0);
 214
 215         samsung_wdt_reset();
 216
 217         /* we'll take a jump through zero as a poor second */
 218         soft_restart(0);
 219 }