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