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
  23 #include <asm/mach/arch.h>
  24 #include <asm/mach/map.h>
  25 #include <asm/mach/irq.h>
  26
  27 #include <asm/proc-fns.h>
  28
  29 #include <mach/hardware.h>
  30 #include <mach/map.h>
  31 #include <asm/irq.h>
  32
  33 #include <plat/regs-serial.h>
  34 #include <mach/regs-clock.h>
  35
  36 #include <plat/cpu.h>
  37 #include <plat/devs.h>
  38 #include <plat/clock.h>
  39 #include <plat/s5p6442.h>
  40
  41 /* Initial IO mappings */
  42
  43 static struct map_desc s5p6442_iodesc[] __initdata = {
  44         {
  45                 .virtual        = (unsigned long)S5P_VA_SYSTIMER,
  46                 .pfn            = __phys_to_pfn(S5P6442_PA_SYSTIMER),
  47                 .length         = SZ_16K,
  48                 .type           = MT_DEVICE,
  49         }, {
  50                 .virtual        = (unsigned long)VA_VIC2,
  51                 .pfn            = __phys_to_pfn(S5P6442_PA_VIC2),
  52                 .length         = SZ_16K,
  53                 .type           = MT_DEVICE,
  54         }
  55 };
  56
  57 static void s5p6442_idle(void)
  58 {
  59         if (!need_resched())
  60                 cpu_do_idle();
  61
  62         local_irq_enable();
  63 }
  64
  65 /* s5p6442_map_io
  66  *
  67  * register the standard cpu IO areas
  68 */
  69
  70 void __init s5p6442_map_io(void)
  71 {
  72         iotable_init(s5p6442_iodesc, ARRAY_SIZE(s5p6442_iodesc));
  73 }
  74
  75 void __init s5p6442_init_clocks(int xtal)
  76 {
  77         printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
  78
  79         s3c24xx_register_baseclocks(xtal);
  80         s5p_register_clocks(xtal);
  81         s5p6442_register_clocks();
  82         s5p6442_setup_clocks();
  83 }
  84
  85 void __init s5p6442_init_irq(void)
  86 {
  87         /* S5P6442 supports 3 VIC */
  88         u32 vic[3];
  89
  90         /* VIC0, VIC1, and VIC2: some interrupt reserved */
  91         vic[0] = 0x7fefffff;
  92         vic[1] = 0X7f389c81;
  93         vic[2] = 0X1bbbcfff;
  94
  95         s5p_init_irq(vic, ARRAY_SIZE(vic));
  96 }
  97
  98 static struct sysdev_class s5p6442_sysclass = {
  99         .name   = "s5p6442-core",
 100 };
 101
 102 static struct sys_device s5p6442_sysdev = {
 103         .cls    = &s5p6442_sysclass,
 104 };
 105
 106 static int __init s5p6442_core_init(void)
 107 {
 108         return sysdev_class_register(&s5p6442_sysclass);
 109 }
 110
 111 core_initcall(s5p6442_core_init);
 112
 113 int __init s5p6442_init(void)
 114 {
 115         printk(KERN_INFO "S5P6442: Initializing architecture\n");
 116
 117         /* set idle function */
 118         pm_idle = s5p6442_idle;
 119
 120         return sysdev_register(&s5p6442_sysdev);
 121 }