arch/arm/mach-s3c2412/s3c2412.c

   1 /* linux/arch/arm/mach-s3c2412/s3c2412.c
   2  *
   3  * Copyright (c) 2006 Simtec Electronics
   4  *      Ben Dooks <ben@simtec.co.uk>
   5  *
   6  * http://armlinux.simtec.co.uk/.
   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/delay.h>
  20 #include <linux/sysdev.h>
  21 #include <linux/serial_core.h>
  22 #include <linux/platform_device.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/proc-fns.h>
  31 #include <asm/irq.h>
  32
  33 #include <mach/reset.h>
  34 #include <mach/idle.h>
  35
  36 #include <mach/regs-clock.h>
  37 #include <plat/regs-serial.h>
  38 #include <mach/regs-power.h>
  39 #include <mach/regs-gpio.h>
  40 #include <mach/regs-gpioj.h>
  41 #include <mach/regs-dsc.h>
  42 #include <asm/plat-s3c24xx/regs-spi.h>
  43 #include <mach/regs-s3c2412.h>
  44
  45 #include <plat/s3c2412.h>
  46 #include <plat/cpu.h>
  47 #include <plat/devs.h>
  48 #include <plat/clock.h>
  49 #include <plat/pm.h>
  50
  51 #ifndef CONFIG_CPU_S3C2412_ONLY
  52 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
  53
  54 static inline void s3c2412_init_gpio2(void)
  55 {
  56         s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
  57 }
  58 #else
  59 #define s3c2412_init_gpio2() do { } while(0)
  60 #endif
  61
  62 /* Initial IO mappings */
  63
  64 static struct map_desc s3c2412_iodesc[] __initdata = {
  65         IODESC_ENT(CLKPWR),
  66         IODESC_ENT(TIMER),
  67         IODESC_ENT(WATCHDOG),
  68 };
  69
  70 /* uart registration process */
  71
  72 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  73 {
  74         s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
  75
  76         /* rename devices that are s3c2412/s3c2413 specific */
  77         s3c_device_sdi.name  = "s3c2412-sdi";
  78         s3c_device_lcd.name  = "s3c2412-lcd";
  79         s3c_device_nand.name = "s3c2412-nand";
  80
  81         /* alter IRQ of SDI controller */
  82
  83         s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
  84         s3c_device_sdi.resource[1].end   = IRQ_S3C2412_SDI;
  85
  86         /* spi channel related changes, s3c2412/13 specific */
  87         s3c_device_spi0.name = "s3c2412-spi";
  88         s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
  89         s3c_device_spi1.name = "s3c2412-spi";
  90         s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
  91         s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
  92
  93 }
  94
  95 /* s3c2412_idle
  96  *
  97  * use the standard idle call by ensuring the idle mode
  98  * in power config, then issuing the idle co-processor
  99  * instruction
 100 */
 101
 102 static void s3c2412_idle(void)
 103 {
 104         unsigned long tmp;
 105
 106         /* ensure our idle mode is to go to idle */
 107
 108         tmp = __raw_readl(S3C2412_PWRCFG);
 109         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 110         tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
 111         __raw_writel(tmp, S3C2412_PWRCFG);
 112
 113         cpu_do_idle();
 114 }
 115
 116 static void s3c2412_hard_reset(void)
 117 {
 118         /* errata "Watch-dog/Software Reset Problem" specifies that
 119          * this reset must be done with the SYSCLK sourced from
 120          * EXTCLK instead of FOUT to avoid a glitch in the reset
 121          * mechanism.
 122          *
 123          * See the watchdog section of the S3C2412 manual for more
 124          * information on this fix.
 125          */
 126
 127         __raw_writel(0x00, S3C2412_CLKSRC);
 128         __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
 129
 130         mdelay(1);
 131 }
 132
 133 /* s3c2412_map_io
 134  *
 135  * register the standard cpu IO areas, and any passed in from the
 136  * machine specific initialisation.
 137 */
 138
 139 void __init s3c2412_map_io(struct map_desc *mach_desc, int mach_size)
 140 {
 141         /* move base of IO */
 142
 143         s3c2412_init_gpio2();
 144
 145         /* set our idle function */
 146
 147         s3c24xx_idle = s3c2412_idle;
 148
 149         /* set custom reset hook */
 150
 151         s3c24xx_reset_hook = s3c2412_hard_reset;
 152
 153         /* register our io-tables */
 154
 155         iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
 156         iotable_init(mach_desc, mach_size);
 157 }
 158
 159 void __init s3c2412_init_clocks(int xtal)
 160 {
 161         unsigned long tmp;
 162         unsigned long fclk;
 163         unsigned long hclk;
 164         unsigned long pclk;
 165
 166         /* now we've got our machine bits initialised, work out what
 167          * clocks we've got */
 168
 169         fclk = s3c2410_get_pll(__raw_readl(S3C2410_MPLLCON), xtal*2);
 170
 171         clk_mpll.rate = fclk;
 172
 173         tmp = __raw_readl(S3C2410_CLKDIVN);
 174
 175         /* work out clock scalings */
 176
 177         hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
 178         hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1);
 179         pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
 180
 181         /* print brieft summary of clocks, etc */
 182
 183         printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 184                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 185
 186         /* initialise the clocks here, to allow other things like the
 187          * console to use them
 188          */
 189
 190         s3c24xx_setup_clocks(xtal, fclk, hclk, pclk);
 191         s3c2412_baseclk_add();
 192 }
 193
 194 /* need to register class before we actually register the device, and
 195  * we also need to ensure that it has been initialised before any of the
 196  * drivers even try to use it (even if not on an s3c2412 based system)
 197  * as a driver which may support both 2410 and 2440 may try and use it.
 198 */
 199
 200 struct sysdev_class s3c2412_sysclass = {
 201         .name = "s3c2412-core",
 202 };
 203
 204 static int __init s3c2412_core_init(void)
 205 {
 206         return sysdev_class_register(&s3c2412_sysclass);
 207 }
 208
 209 core_initcall(s3c2412_core_init);
 210
 211 static struct sys_device s3c2412_sysdev = {
 212         .cls            = &s3c2412_sysclass,
 213 };
 214
 215 int __init s3c2412_init(void)
 216 {
 217         printk("S3C2412: Initialising architecture\n");
 218
 219         return sysdev_register(&s3c2412_sysdev);
 220 }