release/src-rt-6.x.4708/linux/linux-2.6.36/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/clk.h>
  20 #include <linux/delay.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/proc-fns.h>
  32 #include <asm/irq.h>
  33
  34 #include <mach/reset.h>
  35 #include <mach/idle.h>
  36
  37 #include <plat/cpu-freq.h>
  38
  39 #include <mach/regs-clock.h>
  40 #include <plat/regs-serial.h>
  41 #include <mach/regs-power.h>
  42 #include <mach/regs-gpio.h>
  43 #include <mach/regs-gpioj.h>
  44 #include <mach/regs-dsc.h>
  45 #include <plat/regs-spi.h>
  46 #include <mach/regs-s3c2412.h>
  47
  48 #include <plat/s3c2412.h>
  49 #include <plat/cpu.h>
  50 #include <plat/devs.h>
  51 #include <plat/clock.h>
  52 #include <plat/pm.h>
  53 #include <plat/pll.h>
  54
  55 #ifndef CONFIG_CPU_S3C2412_ONLY
  56 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
  57
  58 static inline void s3c2412_init_gpio2(void)
  59 {
  60         s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
  61 }
  62 #else
  63 #define s3c2412_init_gpio2() do { } while(0)
  64 #endif
  65
  66 /* Initial IO mappings */
  67
  68 static struct map_desc s3c2412_iodesc[] __initdata = {
  69         IODESC_ENT(CLKPWR),
  70         IODESC_ENT(TIMER),
  71         IODESC_ENT(WATCHDOG),
  72         {
  73                 .virtual = (unsigned long)S3C2412_VA_SSMC,
  74                 .pfn     = __phys_to_pfn(S3C2412_PA_SSMC),
  75                 .length  = SZ_1M,
  76                 .type    = MT_DEVICE,
  77         },
  78         {
  79                 .virtual = (unsigned long)S3C2412_VA_EBI,
  80                 .pfn     = __phys_to_pfn(S3C2412_PA_EBI),
  81                 .length  = SZ_1M,
  82                 .type    = MT_DEVICE,
  83         },
  84 };
  85
  86 /* uart registration process */
  87
  88 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  89 {
  90         s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
  91
  92         /* rename devices that are s3c2412/s3c2413 specific */
  93         s3c_device_sdi.name  = "s3c2412-sdi";
  94         s3c_device_lcd.name  = "s3c2412-lcd";
  95         s3c_device_nand.name = "s3c2412-nand";
  96
  97         /* alter IRQ of SDI controller */
  98
  99         s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
 100         s3c_device_sdi.resource[1].end   = IRQ_S3C2412_SDI;
 101
 102         /* spi channel related changes, s3c2412/13 specific */
 103         s3c_device_spi0.name = "s3c2412-spi";
 104         s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
 105         s3c_device_spi1.name = "s3c2412-spi";
 106         s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
 107         s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
 108
 109 }
 110
 111 /* s3c2412_idle
 112  *
 113  * use the standard idle call by ensuring the idle mode
 114  * in power config, then issuing the idle co-processor
 115  * instruction
 116 */
 117
 118 static void s3c2412_idle(void)
 119 {
 120         unsigned long tmp;
 121
 122         /* ensure our idle mode is to go to idle */
 123
 124         tmp = __raw_readl(S3C2412_PWRCFG);
 125         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 126         tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
 127         __raw_writel(tmp, S3C2412_PWRCFG);
 128
 129         cpu_do_idle();
 130 }
 131
 132 static void s3c2412_hard_reset(void)
 133 {
 134         /* errata "Watch-dog/Software Reset Problem" specifies that
 135          * this reset must be done with the SYSCLK sourced from
 136          * EXTCLK instead of FOUT to avoid a glitch in the reset
 137          * mechanism.
 138          *
 139          * See the watchdog section of the S3C2412 manual for more
 140          * information on this fix.
 141          */
 142
 143         __raw_writel(0x00, S3C2412_CLKSRC);
 144         __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
 145
 146         mdelay(1);
 147 }
 148
 149 /* s3c2412_map_io
 150  *
 151  * register the standard cpu IO areas, and any passed in from the
 152  * machine specific initialisation.
 153 */
 154
 155 void __init s3c2412_map_io(void)
 156 {
 157         /* move base of IO */
 158
 159         s3c2412_init_gpio2();
 160
 161         /* set our idle function */
 162
 163         s3c24xx_idle = s3c2412_idle;
 164
 165         /* set custom reset hook */
 166
 167         s3c24xx_reset_hook = s3c2412_hard_reset;
 168
 169         /* register our io-tables */
 170
 171         iotable_init(s3c2412_iodesc, ARRAY_SIZE(s3c2412_iodesc));
 172 }
 173
 174 void __init_or_cpufreq s3c2412_setup_clocks(void)
 175 {
 176         struct clk *xtal_clk;
 177         unsigned long tmp;
 178         unsigned long xtal;
 179         unsigned long fclk;
 180         unsigned long hclk;
 181         unsigned long pclk;
 182
 183         xtal_clk = clk_get(NULL, "xtal");
 184         xtal = clk_get_rate(xtal_clk);
 185         clk_put(xtal_clk);
 186
 187         /* now we've got our machine bits initialised, work out what
 188          * clocks we've got */
 189
 190         fclk = s3c24xx_get_pll(__raw_readl(S3C2410_MPLLCON), xtal * 2);
 191
 192         clk_mpll.rate = fclk;
 193
 194         tmp = __raw_readl(S3C2410_CLKDIVN);
 195
 196         /* work out clock scalings */
 197
 198         hclk = fclk / ((tmp & S3C2412_CLKDIVN_HDIVN_MASK) + 1);
 199         hclk /= ((tmp & S3C2412_CLKDIVN_ARMDIVN) ? 2 : 1);
 200         pclk = hclk / ((tmp & S3C2412_CLKDIVN_PDIVN) ? 2 : 1);
 201
 202         /* print brieft summary of clocks, etc */
 203
 204         printk("S3C2412: core %ld.%03ld MHz, memory %ld.%03ld MHz, peripheral %ld.%03ld MHz\n",
 205                print_mhz(fclk), print_mhz(hclk), print_mhz(pclk));
 206
 207         s3c24xx_setup_clocks(fclk, hclk, pclk);
 208 }
 209
 210 void __init s3c2412_init_clocks(int xtal)
 211 {
 212         /* initialise the clocks here, to allow other things like the
 213          * console to use them
 214          */
 215
 216         s3c24xx_register_baseclocks(xtal);
 217         s3c2412_setup_clocks();
 218         s3c2412_baseclk_add();
 219 }
 220
 221 /* need to register class before we actually register the device, and
 222  * we also need to ensure that it has been initialised before any of the
 223  * drivers even try to use it (even if not on an s3c2412 based system)
 224  * as a driver which may support both 2410 and 2440 may try and use it.
 225 */
 226
 227 struct sysdev_class s3c2412_sysclass = {
 228         .name = "s3c2412-core",
 229 };
 230
 231 static int __init s3c2412_core_init(void)
 232 {
 233         return sysdev_class_register(&s3c2412_sysclass);
 234 }
 235
 236 core_initcall(s3c2412_core_init);
 237
 238 static struct sys_device s3c2412_sysdev = {
 239         .cls            = &s3c2412_sysclass,
 240 };
 241
 242 int __init s3c2412_init(void)
 243 {
 244         printk("S3C2412: Initialising architecture\n");
 245
 246         return sysdev_register(&s3c2412_sysdev);
 247 }