arch/arm/mach-s3c24xx/s3c2412.c

   1 /*
   2  * Copyright (c) 2006 Simtec Electronics
   3  *      Ben Dooks <ben@simtec.co.uk>
   4  *
   5  * http://armlinux.simtec.co.uk/.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10 */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/types.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/list.h>
  16 #include <linux/timer.h>
  17 #include <linux/init.h>
  18 #include <linux/clk.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <linux/syscore_ops.h>
  22 #include <linux/serial_core.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/io.h>
  25 #include <linux/reboot.h>
  26
  27 #include <asm/mach/arch.h>
  28 #include <asm/mach/map.h>
  29 #include <asm/mach/irq.h>
  30
  31 #include <asm/proc-fns.h>
  32 #include <asm/irq.h>
  33 #include <asm/system_misc.h>
  34
  35 #include <mach/hardware.h>
  36 #include <mach/regs-clock.h>
  37 #include <mach/regs-gpio.h>
  38
  39 #include <plat/clock.h>
  40 #include <plat/cpu.h>
  41 #include <plat/cpu-freq.h>
  42 #include <plat/devs.h>
  43 #include <plat/nand-core.h>
  44 #include <plat/pll.h>
  45 #include <plat/pm.h>
  46 #include <plat/regs-serial.h>
  47 #include <plat/regs-spi.h>
  48
  49 #include "common.h"
  50 #include "regs-dsc.h"
  51 #include "s3c2412-power.h"
  52
  53 #define S3C2412_SWRST                   (S3C24XX_VA_CLKPWR + 0x30)
  54 #define S3C2412_SWRST_RESET             (0x533C2412)
  55
  56 #ifndef CONFIG_CPU_S3C2412_ONLY
  57 void __iomem *s3c24xx_va_gpio2 = S3C24XX_VA_GPIO;
  58
  59 static inline void s3c2412_init_gpio2(void)
  60 {
  61         s3c24xx_va_gpio2 = S3C24XX_VA_GPIO + 0x10;
  62 }
  63 #else
  64 #define s3c2412_init_gpio2() do { } while(0)
  65 #endif
  66
  67 /* Initial IO mappings */
  68
  69 static struct map_desc s3c2412_iodesc[] __initdata = {
  70         IODESC_ENT(CLKPWR),
  71         IODESC_ENT(TIMER),
  72         IODESC_ENT(WATCHDOG),
  73         {
  74                 .virtual = (unsigned long)S3C2412_VA_SSMC,
  75                 .pfn     = __phys_to_pfn(S3C2412_PA_SSMC),
  76                 .length  = SZ_1M,
  77                 .type    = MT_DEVICE,
  78         },
  79         {
  80                 .virtual = (unsigned long)S3C2412_VA_EBI,
  81                 .pfn     = __phys_to_pfn(S3C2412_PA_EBI),
  82                 .length  = SZ_1M,
  83                 .type    = MT_DEVICE,
  84         },
  85 };
  86
  87 /* uart registration process */
  88
  89 void __init s3c2412_init_uarts(struct s3c2410_uartcfg *cfg, int no)
  90 {
  91         s3c24xx_init_uartdevs("s3c2412-uart", s3c2410_uart_resources, cfg, no);
  92
  93         /* rename devices that are s3c2412/s3c2413 specific */
  94         s3c_device_sdi.name  = "s3c2412-sdi";
  95         s3c_device_lcd.name  = "s3c2412-lcd";
  96         s3c_nand_setname("s3c2412-nand");
  97
  98         /* alter IRQ of SDI controller */
  99
 100         s3c_device_sdi.resource[1].start = IRQ_S3C2412_SDI;
 101         s3c_device_sdi.resource[1].end   = IRQ_S3C2412_SDI;
 102
 103         /* spi channel related changes, s3c2412/13 specific */
 104         s3c_device_spi0.name = "s3c2412-spi";
 105         s3c_device_spi0.resource[0].end = S3C24XX_PA_SPI + 0x24;
 106         s3c_device_spi1.name = "s3c2412-spi";
 107         s3c_device_spi1.resource[0].start = S3C24XX_PA_SPI + S3C2412_SPI1;
 108         s3c_device_spi1.resource[0].end = S3C24XX_PA_SPI + S3C2412_SPI1 + 0x24;
 109
 110 }
 111
 112 /* s3c2412_idle
 113  *
 114  * use the standard idle call by ensuring the idle mode
 115  * in power config, then issuing the idle co-processor
 116  * instruction
 117 */
 118
 119 static void s3c2412_idle(void)
 120 {
 121         unsigned long tmp;
 122
 123         /* ensure our idle mode is to go to idle */
 124
 125         tmp = __raw_readl(S3C2412_PWRCFG);
 126         tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
 127         tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
 128         __raw_writel(tmp, S3C2412_PWRCFG);
 129
 130         cpu_do_idle();
 131 }
 132
 133 void s3c2412_restart(enum reboot_mode mode, const char *cmd)
 134 {
 135         if (mode == REBOOT_SOFT)
 136                 soft_restart(0);
 137
 138         /* errata "Watch-dog/Software Reset Problem" specifies that
 139          * this reset must be done with the SYSCLK sourced from
 140          * EXTCLK instead of FOUT to avoid a glitch in the reset
 141          * mechanism.
 142          *
 143          * See the watchdog section of the S3C2412 manual for more
 144          * information on this fix.
 145          */
 146
 147         __raw_writel(0x00, S3C2412_CLKSRC);
 148         __raw_writel(S3C2412_SWRST_RESET, S3C2412_SWRST);
 149
 150         mdelay(1);
 151 }
 152
 153 /* s3c2412_map_io
 154  *
 155  * register the standard cpu IO areas, and any passed in from the
 156  * machine specific initialisation.
 157 */
 158
 159 void __init s3c2412_map_io(void)
 160 {
 161         /* move base of IO */
 162
 163         s3c2412_init_gpio2();
 164
 165         /* set our idle function */
 166
 167         arm_pm_idle = s3c2412_idle;
 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 the subsystem 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 bus_type s3c2412_subsys = {
 228         .name = "s3c2412-core",
 229         .dev_name = "s3c2412-core",
 230 };
 231
 232 static int __init s3c2412_core_init(void)
 233 {
 234         return subsys_system_register(&s3c2412_subsys, NULL);
 235 }
 236
 237 core_initcall(s3c2412_core_init);
 238
 239 static struct device s3c2412_dev = {
 240         .bus            = &s3c2412_subsys,
 241 };
 242
 243 int __init s3c2412_init(void)
 244 {
 245         printk("S3C2412: Initialising architecture\n");
 246
 247 #ifdef CONFIG_PM
 248         register_syscore_ops(&s3c2412_pm_syscore_ops);
 249         register_syscore_ops(&s3c24xx_irq_syscore_ops);
 250 #endif
 251
 252         return device_register(&s3c2412_dev);
 253 }