arch/arm/mach-s3c24xx/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/device.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 #include <asm/system_misc.h>
  34
  35 #include <plat/cpu-freq.h>
  36
  37 #include <mach/regs-clock.h>
  38 #include <plat/regs-serial.h>
  39
  40 #include <plat/s3c2410.h>
  41 #include <plat/cpu.h>
  42 #include <plat/devs.h>
  43 #include <plat/clock.h>
  44 #include <plat/pll.h>
  45 #include <plat/pm.h>
  46 #include <plat/watchdog-reset.h>
  47
  48 #include <plat/gpio-core.h>
  49 #include <plat/gpio-cfg.h>
  50 #include <plat/gpio-cfg-helpers.h>
  51
  52 /* Initial IO mappings */
  53
  54 static struct map_desc s3c2410_iodesc[] __initdata = {
  55         IODESC_ENT(CLKPWR),
  56         IODESC_ENT(TIMER),
  57         IODESC_ENT(WATCHDOG),
  58 };
  59
  60 /* our uart devices */
  61
  62 /* uart registration process */
  63
  64 void __init s3c2410_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  65 {
  66         s3c24xx_init_uartdevs("s3c2410-uart", s3c2410_uart_resources, cfg, no);
  67 }
  68
  69 /* s3c2410_map_io
  70  *
  71  * register the standard cpu IO areas, and any passed in from the
  72  * machine specific initialisation.
  73 */
  74
  75 void __init s3c2410_map_io(void)
  76 {
  77         s3c24xx_gpiocfg_default.set_pull = s3c24xx_gpio_setpull_1up;
  78         s3c24xx_gpiocfg_default.get_pull = s3c24xx_gpio_getpull_1up;
  79
  80         iotable_init(s3c2410_iodesc, ARRAY_SIZE(s3c2410_iodesc));
  81 }
  82
  83 void __init_or_cpufreq s3c2410_setup_clocks(void)
  84 {
  85         struct clk *xtal_clk;
  86         unsigned long tmp;
  87         unsigned long xtal;
  88         unsigned long fclk;
  89         unsigned long hclk;
  90         unsigned long pclk;
  91
  92         xtal_clk = clk_get(NULL, "xtal");
  93         xtal = clk_get_rate(xtal_clk);
  94         clk_put(xtal_clk);
  95
  96         /* now we've got our machine bits initialised, work out what
  97          * clocks we've got */
  98
  99         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal);
 100
 101         tmp = __raw_readl(S3C2410_CLKDIVN);
 102
 103         /* work out clock scalings */
 104
 105         hclk = fclk / ((tmp & S3C2410_CLKDIVN_HDIVN) ? 2 : 1);
 106         pclk = hclk / ((tmp & S3C2410_CLKDIVN_PDIVN) ? 2 : 1);
 107
 108         /* print brieft summary of clocks, etc */
 109
 110         printk("S3C2410: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 111                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 112
 113         /* initialise the clocks here, to allow other things like the
 114          * console to use them
 115          */
 116
 117         s3c24xx_setup_clocks(fclk, hclk, pclk);
 118 }
 119
 120 /* fake ARMCLK for use with cpufreq, etc. */
 121
 122 static struct clk s3c2410_armclk = {
 123         .name   = "armclk",
 124         .parent = &clk_f,
 125         .id     = -1,
 126 };
 127
 128 static struct clk_lookup s3c2410_clk_lookup[] = {
 129         CLKDEV_INIT(NULL, "clk_uart_baud0", &clk_p),
 130         CLKDEV_INIT(NULL, "clk_uart_baud1", &s3c24xx_uclk),
 131 };
 132
 133 void __init s3c2410_init_clocks(int xtal)
 134 {
 135         s3c24xx_register_baseclocks(xtal);
 136         s3c2410_setup_clocks();
 137         s3c2410_baseclk_add();
 138         s3c24xx_register_clock(&s3c2410_armclk);
 139         clkdev_add_table(s3c2410_clk_lookup, ARRAY_SIZE(s3c2410_clk_lookup));
 140 }
 141
 142 struct bus_type s3c2410_subsys = {
 143         .name = "s3c2410-core",
 144         .dev_name = "s3c2410-core",
 145 };
 146
 147 /* Note, we would have liked to name this s3c2410-core, but we cannot
 148  * register two subsystems with the same name.
 149  */
 150 struct bus_type s3c2410a_subsys = {
 151         .name = "s3c2410a-core",
 152         .dev_name = "s3c2410a-core",
 153 };
 154
 155 static struct device s3c2410_dev = {
 156         .bus            = &s3c2410_subsys,
 157 };
 158
 159 /* need to register the subsystem before we actually register the device, and
 160  * we also need to ensure that it has been initialised before any of the
 161  * drivers even try to use it (even if not on an s3c2410 based system)
 162  * as a driver which may support both 2410 and 2440 may try and use it.
 163 */
 164
 165 static int __init s3c2410_core_init(void)
 166 {
 167         return subsys_system_register(&s3c2410_subsys, NULL);
 168 }
 169
 170 core_initcall(s3c2410_core_init);
 171
 172 static int __init s3c2410a_core_init(void)
 173 {
 174         return subsys_system_register(&s3c2410a_subsys, NULL);
 175 }
 176
 177 core_initcall(s3c2410a_core_init);
 178
 179 int __init s3c2410_init(void)
 180 {
 181         printk("S3C2410: Initialising architecture\n");
 182
 183 #ifdef CONFIG_PM
 184         register_syscore_ops(&s3c2410_pm_syscore_ops);
 185 #endif
 186         register_syscore_ops(&s3c24xx_irq_syscore_ops);
 187
 188         return device_register(&s3c2410_dev);
 189 }
 190
 191 int __init s3c2410a_init(void)
 192 {
 193         s3c2410_dev.bus = &s3c2410a_subsys;
 194         return s3c2410_init();
 195 }
 196
 197 void s3c2410_restart(char mode, const char *cmd)
 198 {
 199         if (mode == 's') {
 200                 soft_restart(0);
 201         }
 202
 203         arch_wdt_reset();
 204
 205         /* we'll take a jump through zero as a poor second */
 206         soft_restart(0);
 207 }