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/syscore_ops.h>
  23 #include <linux/serial_core.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/io.h>
  26
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/map.h>
  29 #include <asm/mach/irq.h>
  30
  31 #include <mach/hardware.h>
  32 #include <asm/irq.h>
  33
  34 #include <plat/cpu-freq.h>
  35
  36 #include <mach/regs-clock.h>
  37 #include <plat/regs-serial.h>
  38
  39 #include <plat/s3c2410.h>
  40 #include <plat/cpu.h>
  41 #include <plat/devs.h>
  42 #include <plat/clock.h>
  43 #include <plat/pll.h>
  44 #include <plat/pm.h>
  45
  46 #include <plat/gpio-core.h>
  47 #include <plat/gpio-cfg.h>
  48 #include <plat/gpio-cfg-helpers.h>
  49
  50 /* Initial IO mappings */
  51
  52 static struct map_desc s3c2410_iodesc[] __initdata = {
  53         IODESC_ENT(CLKPWR),
  54         IODESC_ENT(TIMER),
  55         IODESC_ENT(WATCHDOG),
  56 };
  57
  58 /* our uart devices */
  59
  60 /* uart registration process */
  61
  62 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  63 {
  64         s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
  65 }
  66
  67 /* s3c2410_map_io
  68  *
  69  * register the standard cpu IO areas, and any passed in from the
  70  * machine specific initialisation.
  71 */
  72
  73 void __init s3c2410_map_io(void)
  74 {
  75         s3c24xx_gpiocfg_default.set_pull = s3c24xx_gpio_setpull_1up;
  76         s3c24xx_gpiocfg_default.get_pull = s3c24xx_gpio_getpull_1up;
  77
  78         iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
  79 }
  80
  81 void __init_or_cpufreq s3c2410_setup_clocks(void)
  82 {
  83         struct clk *xtal_clk;
  84         unsigned long tmp;
  85         unsigned long xtal;
  86         unsigned long fclk;
  87         unsigned long hclk;
  88         unsigned long pclk;
  89
  90         xtal_clk = clk_get(NULL, "xtal");
  91         xtal = clk_get_rate(xtal_clk);
  92         clk_put(xtal_clk);
  93
  94         /* now we've got our machine bits initialised, work out what
  95          * clocks we've got */
  96
  97         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
  98
  99         tmp = __raw_readl(S3C2410_CLKDIVN);
 100
 101         /* work out clock scalings */
 102
 103         hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
 104         pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
 105
 106         /* print brieft summary of clocks, etc */
 107
 108         printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 109                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 110
 111         /* initialise the clocks here, to allow other things like the
 112          * console to use them
 113          */
 114
 115         s3c24xx_setup_clocks(fclk, hclk, pclk);
 116 }
 117
 118 /* fake ARMCLK for use with cpufreq, etc. */
 119
 120 static struct clk s3c2410_armclk = {
 121         .name   = "armclk",
 122         .parent = &clk_f,
 123         .id     = -1,
 124 };
 125
 126 void __init s3c2410_init_clocks(int xtal)
 127 {
 128         s3c24xx_register_baseclocks(xtal);
 129         s3c2410_setup_clocks();
 130         s3c2410_baseclk_add();
 131         s3c24xx_register_clock(&s3c2410_armclk);
 132 }
 133
 134 struct sysdev_class s3c2410_sysclass = {
 135         .name = "s3c2410-core",
 136 };
 137
 138 /* Note, we would have liked to name this s3c2410-core, but we cannot
 139  * register two sysdev_class with the same name.
 140  */
 141 struct sysdev_class s3c2410a_sysclass = {
 142         .name = "s3c2410a-core",
 143 };
 144
 145 static struct sys_device s3c2410_sysdev = {
 146         .cls            = &s3c2410_sysclass,
 147 };
 148
 149 /* need to register class before we actually register the device, and
 150  * we also need to ensure that it has been initialised before any of the
 151  * drivers even try to use it (even if not on an s3c2410 based system)
 152  * as a driver which may support both 2410 and 2440 may try and use it.
 153 */
 154
 155 static int __init s3c2410_core_init(void)
 156 {
 157         return sysdev_class_register(&s3c2410_sysclass);
 158 }
 159
 160 core_initcall(s3c2410_core_init);
 161
 162 static int __init s3c2410a_core_init(void)
 163 {
 164         return sysdev_class_register(&s3c2410a_sysclass);
 165 }
 166
 167 core_initcall(s3c2410a_core_init);
 168
 169 int __init s3c2410_init(void)
 170 {
 171         printk("S3C2410: Initialising architecture\n");
 172
 173         register_syscore_ops(&s3c2410_pm_syscore_ops);
 174         register_syscore_ops(&s3c24xx_irq_syscore_ops);
 175
 176         return sysdev_register(&s3c2410_sysdev);
 177 }
 178
 179 int __init s3c2410a_init(void)
 180 {
 181         s3c2410_sysdev.cls = &s3c2410a_sysclass;
 182         return s3c2410_init();
 183 }