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)S5P_VA_GPIO,
  52                 .pfn            = __phys_to_pfn(S5P6442_PA_GPIO),
  53                 .length         = SZ_4K,
  54                 .type           = MT_DEVICE,
  55         }, {
  56                 .virtual        = (unsigned long)VA_VIC0,
  57                 .pfn            = __phys_to_pfn(S5P6442_PA_VIC0),
  58                 .length         = SZ_16K,
  59                 .type           = MT_DEVICE,
  60         }, {
  61                 .virtual        = (unsigned long)VA_VIC1,
  62                 .pfn            = __phys_to_pfn(S5P6442_PA_VIC1),
  63                 .length         = SZ_16K,
  64                 .type           = MT_DEVICE,
  65         }, {
  66                 .virtual        = (unsigned long)VA_VIC2,
  67                 .pfn            = __phys_to_pfn(S5P6442_PA_VIC2),
  68                 .length         = SZ_16K,
  69                 .type           = MT_DEVICE,
  70         }, {
  71                 .virtual        = (unsigned long)S3C_VA_UART,
  72                 .pfn            = __phys_to_pfn(S3C_PA_UART),
  73                 .length         = SZ_512K,
  74                 .type           = MT_DEVICE,
  75         }
  76 };
  77
  78 static void s5p6442_idle(void)
  79 {
  80         if (!need_resched())
  81                 cpu_do_idle();
  82
  83         local_irq_enable();
  84 }
  85
  86 /*
  87  * s5p6442_map_io
  88  *
  89  * register the standard cpu IO areas
  90  */
  91
  92 void __init s5p6442_map_io(void)
  93 {
  94         iotable_init(s5p6442_iodesc, ARRAY_SIZE(s5p6442_iodesc));
  95 }
  96
  97 void __init s5p6442_init_clocks(int xtal)
  98 {
  99         printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
 100
 101         s3c24xx_register_baseclocks(xtal);
 102         s5p_register_clocks(xtal);
 103         s5p6442_register_clocks();
 104         s5p6442_setup_clocks();
 105 }
 106
 107 void __init s5p6442_init_irq(void)
 108 {
 109         /* S5P6442 supports 3 VIC */
 110         u32 vic[3];
 111
 112         /* VIC0, VIC1, and VIC2: some interrupt reserved */
 113         vic[0] = 0x7fefffff;
 114         vic[1] = 0X7f389c81;
 115         vic[2] = 0X1bbbcfff;
 116
 117         s5p_init_irq(vic, ARRAY_SIZE(vic));
 118 }
 119
 120 struct sysdev_class s5p6442_sysclass = {
 121         .name   = "s5p6442-core",
 122 };
 123
 124 static struct sys_device s5p6442_sysdev = {
 125         .cls    = &s5p6442_sysclass,
 126 };
 127
 128 static int __init s5p6442_core_init(void)
 129 {
 130         return sysdev_class_register(&s5p6442_sysclass);
 131 }
 132
 133 core_initcall(s5p6442_core_init);
 134
 135 int __init s5p6442_init(void)
 136 {
 137         printk(KERN_INFO "S5P6442: Initializing architecture\n");
 138
 139         /* set idle function */
 140         pm_idle = s5p6442_idle;
 141
 142         return sysdev_register(&s5p6442_sysdev);
 143 }