LXR linux/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 <mach/regs-clock.h>
  33#include <plat/regs-serial.h>
  34#include <mach/regs-gpio.h>
  35#include <mach/regs-gpioj.h>
  36#include <mach/regs-dsc.h>
  37
  38#include <plat/s3c2410.h>
  39#include <plat/s3c2440.h>
  40#include "s3c244x.h"
  41#include <plat/clock.h>
  42#include <plat/devs.h>
  43#include <plat/cpu.h>
  44#include <plat/pm.h>
  45
  46static struct map_desc s3c244x_iodesc[] __initdata = {
  47        IODESC_ENT(CLKPWR),
  48        IODESC_ENT(TIMER),
  49        IODESC_ENT(WATCHDOG),
  50};
  51
  52/* uart initialisation */
  53
  54void __init s3c244x_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  55{
  56        s3c24xx_init_uartdevs("s3c2440-uart", s3c2410_uart_resources, cfg, no);
  57}
  58
  59void __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_sdi.name  = "s3c2440-sdi";
  69        s3c_device_i2c.name  = "s3c2440-i2c";
  70        s3c_device_nand.name = "s3c2440-nand";
  71        s3c_device_usbgadget.name = "s3c2440-usbgadget";
  72}
  73
  74void __init s3c244x_init_clocks(int xtal)
  75{
  76        unsigned long clkdiv;
  77        unsigned long camdiv;
  78        unsigned long hclk, fclk, pclk;
  79        int hdiv = 1;
  80
  81        /* now we've got our machine bits initialised, work out what
  82         * clocks we've got */
  83
  84        fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal) * 2;
  85
  86        clkdiv = __raw_readl(S3C2410_CLKDIVN);
  87        camdiv = __raw_readl(S3C2440_CAMDIVN);
  88
  89        /* work out clock scalings */
  90
  91        switch (clkdiv & S3C2440_CLKDIVN_HDIVN_MASK) {
  92        case S3C2440_CLKDIVN_HDIVN_1:
  93                hdiv = 1;
  94                break;
  95
  96        case S3C2440_CLKDIVN_HDIVN_2:
  97                hdiv = 2;
  98                break;
  99
 100        case S3C2440_CLKDIVN_HDIVN_4_8:
 101                hdiv = (camdiv & S3C2440_CAMDIVN_HCLK4_HALF) ? 8 : 4;
 102                break;
 103
 104        case S3C2440_CLKDIVN_HDIVN_3_6:
 105                hdiv = (camdiv & S3C2440_CAMDIVN_HCLK3_HALF) ? 6 : 3;
 106                break;
 107        }
 108
 109        hclk = fclk / hdiv;
 110        pclk = hclk / ((clkdiv & S3C2440_CLKDIVN_PDIVN)? 2:1);
 111
 112        /* print brief summary of clocks, etc */
 113
 114        printk("S3C244X: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 115               print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 116
 117        /* initialise the clocks here, to allow other things like the
 118         * console to use them, and to add new ones after the initialisation
 119         */
 120
 121        s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
 122        s3c2410_baseclk_add();
 123}
 124
 125#ifdef CONFIG_PM
 126
 127static struct sleep_save s3c244x_sleep[] = {
 128        SAVE_ITEM(S3C2440_DSC0),
 129        SAVE_ITEM(S3C2440_DSC1),
 130        SAVE_ITEM(S3C2440_GPJDAT),
 131        SAVE_ITEM(S3C2440_GPJCON),
 132        SAVE_ITEM(S3C2440_GPJUP)
 133};
 134
 135static int s3c244x_suspend(struct sys_device *dev, pm_message_t state)
 136{
 137        s3c2410_pm_do_save(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 138        return 0;
 139}
 140
 141static int s3c244x_resume(struct sys_device *dev)
 142{
 143        s3c2410_pm_do_restore(s3c244x_sleep, ARRAY_SIZE(s3c244x_sleep));
 144        return 0;
 145}
 146
 147#else
 148#define s3c244x_suspend NULL
 149#define s3c244x_resume  NULL
 150#endif
 151
 152/* Since the S3C2442 and S3C2440 share  items, put both sysclasses here */
 153
 154struct sysdev_class s3c2440_sysclass = {
 155        .name           = "s3c2440-core",
 156        .suspend        = s3c244x_suspend,
 157        .resume         = s3c244x_resume
 158};
 159
 160struct sysdev_class s3c2442_sysclass = {
 161        .name           = "s3c2442-core",
 162        .suspend        = s3c244x_suspend,
 163        .resume         = s3c244x_resume
 164};
 165
 166/* need to register class before we actually register the device, and
 167 * we also need to ensure that it has been initialised before any of the
 168 * drivers even try to use it (even if not on an s3c2440 based system)
 169 * as a driver which may support both 2410 and 2440 may try and use it.
 170*/
 171
 172static int __init s3c2440_core_init(void)
 173{
 174        return sysdev_class_register(&s3c2440_sysclass);
 175}
 176
 177core_initcall(s3c2440_core_init);
 178
 179static int __init s3c2442_core_init(void)
 180{
 181        return sysdev_class_register(&s3c2442_sysclass);
 182}
 183
 184core_initcall(s3c2442_core_init);
 185