release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-s5p6442/cpu.c

   1 /* linux/arch/arm/mach-s5p6442/cpu.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com/
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9 */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/list.h>
  15 #include <linux/timer.h>
  16 #include <linux/init.h>
  17 #include <linux/clk.h>
  18 #include <linux/io.h>
  19 #include <linux/sysdev.h>
  20 #include <linux/serial_core.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/sched.h>
  23
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26 #include <asm/mach/irq.h>
  27
  28 #include <asm/proc-fns.h>
  29
  30 #include <mach/hardware.h>
  31 #include <mach/map.h>
  32 #include <asm/irq.h>
  33
  34 #include <plat/regs-serial.h>
  35 #include <mach/regs-clock.h>
  36
  37 #include <plat/cpu.h>
  38 #include <plat/devs.h>
  39 #include <plat/clock.h>
  40 #include <plat/s5p6442.h>
  41
  42 /* Initial IO mappings */
  43
  44 static struct map_desc s5p6442_iodesc[] __initdata = {
  45         {
  46                 .virtual        = (unsigned long)S5P_VA_SYSTIMER,
  47                 .pfn            = __phys_to_pfn(S5P6442_PA_SYSTIMER),
  48                 .length         = SZ_16K,
  49                 .type           = MT_DEVICE,
  50         }, {
  51                 .virtual        = (unsigned long)VA_VIC2,
  52                 .pfn            = __phys_to_pfn(S5P6442_PA_VIC2),
  53                 .length         = SZ_16K,
  54                 .type           = MT_DEVICE,
  55         }
  56 };
  57
  58 static void s5p6442_idle(void)
  59 {
  60         if (!need_resched())
  61                 cpu_do_idle();
  62
  63         local_irq_enable();
  64 }
  65
  66 /* s5p6442_map_io
  67  *
  68  * register the standard cpu IO areas
  69 */
  70
  71 void __init s5p6442_map_io(void)
  72 {
  73         iotable_init(s5p6442_iodesc, ARRAY_SIZE(s5p6442_iodesc));
  74 }
  75
  76 void __init s5p6442_init_clocks(int xtal)
  77 {
  78         printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
  79
  80         s3c24xx_register_baseclocks(xtal);
  81         s5p_register_clocks(xtal);
  82         s5p6442_register_clocks();
  83         s5p6442_setup_clocks();
  84 }
  85
  86 void __init s5p6442_init_irq(void)
  87 {
  88         /* S5P6442 supports 3 VIC */
  89         u32 vic[3];
  90
  91         /* VIC0, VIC1, and VIC2: some interrupt reserved */
  92         vic[0] = 0x7fefffff;
  93         vic[1] = 0X7f389c81;
  94         vic[2] = 0X1bbbcfff;
  95
  96         s5p_init_irq(vic, ARRAY_SIZE(vic));
  97 }
  98
  99 struct sysdev_class s5p6442_sysclass = {
 100         .name   = "s5p6442-core",
 101 };
 102
 103 static struct sys_device s5p6442_sysdev = {
 104         .cls    = &s5p6442_sysclass,
 105 };
 106
 107 static int __init s5p6442_core_init(void)
 108 {
 109         return sysdev_class_register(&s5p6442_sysclass);
 110 }
 111
 112 core_initcall(s5p6442_core_init);
 113
 114 int __init s5p6442_init(void)
 115 {
 116         printk(KERN_INFO "S5P6442: Initializing architecture\n");
 117
 118         /* set idle function */
 119         pm_idle = s5p6442_idle;
 120
 121         return sysdev_register(&s5p6442_sysdev);
 122 }