arch/arm/plat-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/sysdev.h>
  22 #include <linux/clk.h>
  23 #include <linux/io.h>
  24
  25 #include <asm/mach/arch.h>
  26 #include <asm/mach/map.h>
  27 #include <asm/mach/irq.h>
  28
  29 #include <mach/hardware.h>
  30 #include <asm/irq.h>
  31
  32 #include <plat/cpu-freq.h>
  33
  34 #include <mach/regs-clock.h>
  35 #include <plat/regs-serial.h>
  36 #include <mach/regs-gpio.h>
  37 #include <mach/regs-gpioj.h>
  38 #include <mach/regs-dsc.h>
  39
  40 #include <plat/s3c2410.h>
  41 #include <plat/s3c2440.h>
  42 #include "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
  49 static struct map_desc s3c244x_iodesc[] __initdata = {
  50         IODESC_ENT(CLKPWR),
  51         IODESC_ENT(TIMER),
  52         IODESC_ENT(WATCHDOG),
  53 };
  54
  55 /* uart initialisation */
  56
  57 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  58 {
  59         s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
  60 }
  61
  62 void __init s3c244x_map_io(void)
  63 {
  64         /* register our io-tables */
  65
  66         iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
  67
  68         /* rename any peripherals used differing from the s3c2410 */
  69
  70         s3c_device_sdi.name  = "s3c2440-sdi";
  71         s3c_device_i2c0.name  = "s3c2440-i2c";
  72         s3c_device_nand.name = "s3c2440-nand";
  73         s3c_device_usbgadget.name = "s3c2440-usbgadget";
  74 }
  75
  76 void __init_or_cpufreq s3c244x_setup_clocks(void)
  77 {
  78         struct clk *xtal_clk;
  79         unsigned long clkdiv;
  80         unsigned long camdiv;
  81         unsigned long xtal;
  82         unsigned long hclk, fclk, pclk;
  83         int hdiv = 1;
  84
  85         xtal_clk = clk_get(NULL, "xtal");
  86         xtal = clk_get_rate(xtal_clk);
  87         clk_put(xtal_clk);
  88
  89         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  90
  91         clkdiv = __raw_readl(S3C2410_CLKDIVN);
  92         camdiv = __raw_readl(S3C2440_CAMDIVN);
  93
  94         /* work out clock scalings */
  95
  96         switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
  97         case S3C2440_CLKDIVN_HDIVN_1:
  98                 hdiv = 1;
  99                 break;
 100
 101         case S3C2440_CLKDIVN_HDIVN_2:
 102                 hdiv = 2;
 103                 break;
 104
 105         case S3C2440_CLKDIVN_HDIVN_4_8:
 106                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 107                 break;
 108
 109         case S3C2440_CLKDIVN_HDIVN_3_6:
 110                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
 111                 break;
 112         }
 113
 114         hclk = fclk / hdiv;
 115         pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN) ? 2 : 1);
 116
 117         /* print brief summary of clocks, etc */
 118
 119         printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 120                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 121
 122         s3c24xx_setup_clocks(fclk, hclk, pclk);
 123 }
 124
 125 void __init s3c244x_init_clocks(int xtal)
 126 {
 127         /* initialise the clocks here, to allow other things like the
 128          * console to use them, and to add new ones after the initialisation
 129          */
 130
 131         s3c24xx_register_baseclocks(xtal);
 132         s3c244x_setup_clocks();
 133         s3c2410_baseclk_add();
 134 }
 135
 136 #ifdef CONFIG_PM
 137
 138 static struct sleep_save s3c244x_sleep[] = {
 139         SAVE_ITEM(S3C2440_DSC0),
 140         SAVE_ITEM(S3C2440_DSC1),
 141         SAVE_ITEM(S3C2440_GPJDAT),
 142         SAVE_ITEM(S3C2440_GPJCON),
 143         SAVE_ITEM(S3C2440_GPJUP)
 144 };
 145
 146 static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
 147 {
 148         s3c_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 149         return 0;
 150 }
 151
 152 static int s3c244x_resume(struct sys_device *dev)
 153 {
 154         s3c_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 155         return 0;
 156 }
 157
 158 #else
 159 #define s3c244x_suspend NULL
 160 #define s3c244x_resume  NULL
 161 #endif
 162
 163 /* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
 164
 165 struct sysdev_class s3c2440_sysclass = {
 166         .name           = "s3c2440-core",
 167         .suspend        = s3c244x_suspend,
 168         .resume         = s3c244x_resume
 169 };
 170
 171 struct sysdev_class s3c2442_sysclass = {
 172         .name           = "s3c2442-core",
 173         .suspend        = s3c244x_suspend,
 174         .resume         = s3c244x_resume
 175 };
 176
 177 /* need to register class before we actually register the device, and
 178  * we also need to ensure that it has been initialised before any of the
 179  * drivers even try to use it (even if not on an s3c2440 based system)
 180  * as a driver which may support both 2410 and 2440 may try and use it.
 181 */
 182
 183 static int __init s3c2440_core_init(void)
 184 {
 185         return sysdev_class_register(&s3c2440_sysclass);
 186 }
 187
 188 core_initcall(s3c2440_core_init);
 189
 190 static int __init s3c2442_core_init(void)
 191 {
 192         return sysdev_class_register(&s3c2442_sysclass);
 193 }
 194
 195 core_initcall(s3c2442_core_init);