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
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <asm/hardware.h>
  29 #include <asm/io.h>
  30 #include <asm/irq.h>
  31
  32 #include <asm/arch/regs-clock.h>
  33 #include <asm/plat-s3c/regs-serial.h>
  34 #include <asm/arch/regs-gpio.h>
  35 #include <asm/arch/regs-gpioj.h>
  36 #include <asm/arch/regs-dsc.h>
  37
  38 #include <asm/plat-s3c24xx/s3c2410.h>
  39 #include <asm/plat-s3c24xx/s3c2440.h>
  40 #include "s3c244x.h"
  41 #include <asm/plat-s3c24xx/clock.h>
  42 #include <asm/plat-s3c24xx/devs.h>
  43 #include <asm/plat-s3c24xx/cpu.h>
  44 #include <asm/plat-s3c24xx/pm.h>
  45
  46 static struct map_desc s3c244x_iodesc[] __initdata = {
  47         IODESC_ENT(CLKPWR),
  48         IODESC_ENT(TIMER),
  49         IODESC_ENT(WATCHDOG),
  50 };
  51
  52 /* uart initialisation */
  53
  54 void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  55 {
  56         s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
  57 }
  58
  59 void __init s3c244x_map_io(struct map_desc *mach_desc, int size)
  60 {
  61         /* register our io-tables */
  62
  63         iotable_init(s3c244x_iodesc, ARRAY_SIZE(s3c244x_iodesc));
  64         iotable_init(mach_desc, size);
  65
  66         /* rename any peripherals used differing from the s3c2410 */
  67
  68         s3c_device_i2c.name  = "s3c2440-i2c";
  69         s3c_device_nand.name = "s3c2440-nand";
  70         s3c_device_usbgadget.name = "s3c2440-usbgadget";
  71 }
  72
  73 void __init s3c244x_init_clocks(int xtal)
  74 {
  75         unsigned long clkdiv;
  76         unsigned long camdiv;
  77         unsigned long hclk, fclk, pclk;
  78         int hdiv = 1;
  79
  80         /* now we've got our machine bits initialised, work out what
  81          * clocks we've got */
  82
  83         fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  84
  85         clkdiv = __raw_readl(S3C2410_CLKDIVN);
  86         camdiv = __raw_readl(S3C2440_CAMDIVN);
  87
  88         /* work out clock scalings */
  89
  90         switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
  91         case S3C2440_CLKDIVN_HDIVN_1:
  92                 hdiv = 1;
  93                 break;
  94
  95         case S3C2440_CLKDIVN_HDIVN_2:
  96                 hdiv = 2;
  97                 break;
  98
  99         case S3C2440_CLKDIVN_HDIVN_4_8:
 100                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 101                 break;
 102
 103         case S3C2440_CLKDIVN_HDIVN_3_6:
 104                 hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
 105                 break;
 106         }
 107
 108         hclk = fclk / hdiv;
 109         pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
 110
 111         /* print brief summary of clocks, etc */
 112
 113         printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 114                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 115
 116         /* initialise the clocks here, to allow other things like the
 117          * console to use them, and to add new ones after the initialisation
 118          */
 119
 120         s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
 121         s3c2410_baseclk_add();
 122 }
 123
 124 #ifdef CONFIG_PM
 125
 126 static struct sleep_save s3c244x_sleep[] = {
 127         SAVE_ITEM(S3C2440_DSC0),
 128         SAVE_ITEM(S3C2440_DSC1),
 129         SAVE_ITEM(S3C2440_GPJDAT),
 130         SAVE_ITEM(S3C2440_GPJCON),
 131         SAVE_ITEM(S3C2440_GPJUP)
 132 };
 133
 134 static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
 135 {
 136         s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 137         return 0;
 138 }
 139
 140 static int s3c244x_resume(struct sys_device *dev)
 141 {
 142         s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 143         return 0;
 144 }
 145
 146 #else
 147 #define s3c244x_suspend NULL
 148 #define s3c244x_resume  NULL
 149 #endif
 150
 151 /* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
 152
 153 struct sysdev_class s3c2440_sysclass = {
 154         .name           = "s3c2440-core",
 155         .suspend        = s3c244x_suspend,
 156         .resume         = s3c244x_resume
 157 };
 158
 159 struct sysdev_class s3c2442_sysclass = {
 160         .name           = "s3c2442-core",
 161         .suspend        = s3c244x_suspend,
 162         .resume         = s3c244x_resume
 163 };
 164
 165 /* need to register class before we actually register the device, and
 166  * we also need to ensure that it has been initialised before any of the
 167  * drivers even try to use it (even if not on an s3c2440 based system)
 168  * as a driver which may support both 2410 and 2440 may try and use it.
 169 */
 170
 171 static int __init s3c2440_core_init(void)
 172 {
 173         return sysdev_class_register(&s3c2440_sysclass);
 174 }
 175
 176 core_initcall(s3c2440_core_init);
 177
 178 static int __init s3c2442_core_init(void)
 179 {
 180         return sysdev_class_register(&s3c2442_sysclass);
 181 }
 182
 183 core_initcall(s3c2442_core_init);