arch/arm/mach-s3c2440/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/sysdev.h>
  22 #include <linux/syscore_ops.h>
  23 #include <linux/clk.h>
  24 #include <linux/io.h>
  25
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/mach/irq.h>
  29
  30 #include <mach/hardware.h>
  31 #include <asm/irq.h>
  32
  33 #include <plat/cpu-freq.h>
  34
  35 #include <mach/regs-clock.h>
  36 #include <plat/regs-serial.h>
  37 #include <mach/regs-gpio.h>
  38 #include <mach/regs-gpioj.h>
  39 #include <mach/regs-dsc.h>
  40
  41 #include <plat/s3c2410.h>
  42 #include <plat/s3c244x.h>
  43 #include <plat/clock.h>
  44 #include <plat/devs.h>
  45 #include <plat/cpu.h>
  46 #include <plat/pm.h>
  47 #include <plat/pll.h>
  48 #include <plat/nand-core.h>
  49
  50 static struct map_desc s3c244x_iodesc[] __initdata = {
  51         IODESC_ENT(CLKPWR),
  52         IODESC_ENT(TIMER),
  53         IODESC_ENT(WATCHDOG),
  54 };
  55
  56 /* uart initialisation */
  57
  58 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  59 {
  60         s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
  61 }
  62
  63 void __init s3c244x_map_io(void)
  64 {
  65         /* register our io-tables */
  66
  67         iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
  68
  69         /* rename any peripherals used differing from the s3c2410 */
  70
  71         s3c_device_sdi.name  = "s3c2440-sdi";
  72         s3c_device_i2c0.name  = "s3c2440-i2c";
  73         s3c_nand_setname("s3c2440-nand");
  74         s3c_device_ts.name = "s3c2440-ts";
  75         s3c_device_usbgadget.name = "s3c2440-usbgadget";
  76 }
  77
  78 void __init_or_cpufreq s3c244x_setup_clocks(void)
  79 {
  80         struct clk *xtal_clk;
  81         unsigned long clkdiv;
  82         unsigned long camdiv;
  83         unsigned long xtal;
  84         unsigned long hclk, fclk, pclk;
  85         int hdiv = 1;
  86
  87         xtal_clk = clk_get(NULL, "xtal");
  88         xtal = clk_get_rate(xtal_clk);
  89         clk_put(xtal_clk);
  90
  91         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  92
  93         clkdiv = __raw_readl(S3C2410_CLKDIVN);
  94         camdiv = __raw_readl(S3C2440_CAMDIVN);
  95
  96         /* work out clock scalings */
  97
  98         switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
  99         case S3C2440_CLKDIVN_HDIVN_1:
 100                 hdiv = 1;
 101                 break;
 102
 103         case S3C2440_CLKDIVN_HDIVN_2:
 104                 hdiv = 2;
 105                 break;
 106
 107         case S3C2440_CLKDIVN_HDIVN_4_8:
 108                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 109                 break;
 110
 111         case S3C2440_CLKDIVN_HDIVN_3_6:
 112                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
 113                 break;
 114         }
 115
 116         hclk = fclk / hdiv;
 117         pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
 118
 119         /* print brief summary of clocks, etc */
 120
 121         printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 122                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 123
 124         s3c24xx_setup_clocks(fclk, hclk, pclk);
 125 }
 126
 127 void __init s3c244x_init_clocks(int xtal)
 128 {
 129         /* initialise the clocks here, to allow other things like the
 130          * console to use them, and to add new ones after the initialisation
 131          */
 132
 133         s3c24xx_register_baseclocks(xtal);
 134         s3c244x_setup_clocks();
 135         s3c2410_baseclk_add();
 136 }
 137
 138 /* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
 139
 140 struct sysdev_class s3c2440_sysclass = {
 141         .name           = "s3c2440-core",
 142 };
 143
 144 struct sysdev_class s3c2442_sysclass = {
 145         .name           = "s3c2442-core",
 146 };
 147
 148 /* need to register class before we actually register the device, and
 149  * we also need to ensure that it has been initialised before any of the
 150  * drivers even try to use it (even if not on an s3c2440 based system)
 151  * as a driver which may support both 2410 and 2440 may try and use it.
 152 */
 153
 154 static int __init s3c2440_core_init(void)
 155 {
 156         return sysdev_class_register(&s3c2440_sysclass);
 157 }
 158
 159 core_initcall(s3c2440_core_init);
 160
 161 static int __init s3c2442_core_init(void)
 162 {
 163         return sysdev_class_register(&s3c2442_sysclass);
 164 }
 165
 166 core_initcall(s3c2442_core_init);
 167
 168
 169 #ifdef CONFIG_PM
 170 static struct sleep_save s3c244x_sleep[] = {
 171         SAVE_ITEM(S3C2440_DSC0),
 172         SAVE_ITEM(S3C2440_DSC1),
 173         SAVE_ITEM(S3C2440_GPJDAT),
 174         SAVE_ITEM(S3C2440_GPJCON),
 175         SAVE_ITEM(S3C2440_GPJUP)
 176 };
 177
 178 static int s3c244x_suspend(void)
 179 {
 180         s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 181         return 0;
 182 }
 183
 184 static void s3c244x_resume(void)
 185 {
 186         s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 187 }
 188 #else
 189 #define s3c244x_suspend NULL
 190 #define s3c244x_resume  NULL
 191 #endif
 192
 193 struct syscore_ops s3c244x_pm_syscore_ops = {
 194         .suspend        = s3c244x_suspend,
 195         .resume         = s3c244x_resume,
 196 };