arch/arm/mach-s3c2410/s3c2410.c

   1 /* linux/arch/arm/mach-s3c2410/s3c2410.c
   2  *
   3  * Copyright (c) 2003-2005 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://www.simtec.co.uk/products/EB2410ITX/
   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/gpio.h>
  20 #include <linux/clk.h>
  21 #include <linux/sysdev.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/platform_device.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
  38 #include <plat/s3c2410.h>
  39 #include <plat/cpu.h>
  40 #include <plat/devs.h>
  41 #include <plat/clock.h>
  42 #include <plat/pll.h>
  43
  44 #include <plat/gpio-core.h>
  45 #include <plat/gpio-cfg.h>
  46 #include <plat/gpio-cfg-helpers.h>
  47
  48 /* Initial IO mappings */
  49
  50 static struct map_desc s3c2410_iodesc[] __initdata = {
  51         IODESC_ENT(CLKPWR),
  52         IODESC_ENT(TIMER),
  53         IODESC_ENT(WATCHDOG),
  54 };
  55
  56 /* our uart devices */
  57
  58 /* uart registration process */
  59
  60 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  61 {
  62         s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
  63 }
  64
  65 /* s3c2410_map_io
  66  *
  67  * register the standard cpu IO areas, and any passed in from the
  68  * machine specific initialisation.
  69 */
  70
  71 void __init s3c2410_map_io(void)
  72 {
  73         s3c24xx_gpiocfg_default.set_pull = s3c_gpio_setpull_1up;
  74         s3c24xx_gpiocfg_default.get_pull = s3c_gpio_getpull_1up;
  75
  76         iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
  77 }
  78
  79 void __init_or_cpufreq s3c2410_setup_clocks(void)
  80 {
  81         struct clk *xtal_clk;
  82         unsigned long tmp;
  83         unsigned long xtal;
  84         unsigned long fclk;
  85         unsigned long hclk;
  86         unsigned long pclk;
  87
  88         xtal_clk = clk_get(NULL, "xtal");
  89         xtal = clk_get_rate(xtal_clk);
  90         clk_put(xtal_clk);
  91
  92         /* now we've got our machine bits initialised, work out what
  93          * clocks we've got */
  94
  95         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
  96
  97         tmp = __raw_readl(S3C2410_CLKDIVN);
  98
  99         /* work out clock scalings */
 100
 101         hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
 102         pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
 103
 104         /* print brieft summary of clocks, etc */
 105
 106         printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 107                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 108
 109         /* initialise the clocks here, to allow other things like the
 110          * console to use them
 111          */
 112
 113         s3c24xx_setup_clocks(fclk, hclk, pclk);
 114 }
 115
 116 /* fake ARMCLK for use with cpufreq, etc. */
 117
 118 static struct clk s3c2410_armclk = {
 119         .name   = "armclk",
 120         .parent = &clk_f,
 121         .id     = -1,
 122 };
 123
 124 void __init s3c2410_init_clocks(int xtal)
 125 {
 126         s3c24xx_register_baseclocks(xtal);
 127         s3c2410_setup_clocks();
 128         s3c2410_baseclk_add();
 129         s3c24xx_register_clock(&s3c2410_armclk);
 130 }
 131
 132 struct sysdev_class s3c2410_sysclass = {
 133         .name = "s3c2410-core",
 134 };
 135
 136 /* Note, we would have liked to name this s3c2410-core, but we cannot
 137  * register two sysdev_class with the same name.
 138  */
 139 struct sysdev_class s3c2410a_sysclass = {
 140         .name = "s3c2410a-core",
 141 };
 142
 143 static struct sys_device s3c2410_sysdev = {
 144         .cls            = &s3c2410_sysclass,
 145 };
 146
 147 /* need to register class before we actually register the device, and
 148  * we also need to ensure that it has been initialised before any of the
 149  * drivers even try to use it (even if not on an s3c2410 based system)
 150  * as a driver which may support both 2410 and 2440 may try and use it.
 151 */
 152
 153 static int __init s3c2410_core_init(void)
 154 {
 155         return sysdev_class_register(&s3c2410_sysclass);
 156 }
 157
 158 core_initcall(s3c2410_core_init);
 159
 160 static int __init s3c2410a_core_init(void)
 161 {
 162         return sysdev_class_register(&s3c2410a_sysclass);
 163 }
 164
 165 core_initcall(s3c2410a_core_init);
 166
 167 int __init s3c2410_init(void)
 168 {
 169         printk("S3C2410: Initialising architecture\n");
 170
 171         return sysdev_register(&s3c2410_sysdev);
 172 }
 173
 174 int __init s3c2410a_init(void)
 175 {
 176         s3c2410_sysdev.cls = &s3c2410a_sysclass;
 177         return s3c2410_init();
 178 }