arch/arm/mach-s5pv310/cpu.c

   1 /* linux/arch/arm/mach-s5pv310/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/sched.h>
  12 #include <linux/sysdev.h>
  13
  14 #include <asm/mach/map.h>
  15 #include <asm/mach/irq.h>
  16
  17 #include <asm/proc-fns.h>
  18 #include <asm/hardware/cache-l2x0.h>
  19
  20 #include <plat/cpu.h>
  21 #include <plat/clock.h>
  22 #include <plat/s5pv310.h>
  23 #include <plat/sdhci.h>
  24
  25 #include <mach/regs-irq.h>
  26
  27 extern int combiner_init(unsigned int combiner_nr, void __iomem *base,
  28                          unsigned int irq_start);
  29 extern void combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq);
  30
  31 /* Initial IO mappings */
  32 static struct map_desc s5pv310_iodesc[] __initdata = {
  33         {
  34                 .virtual        = (unsigned long)S5P_VA_SYSRAM,
  35                 .pfn            = __phys_to_pfn(S5PV310_PA_SYSRAM),
  36                 .length         = SZ_4K,
  37                 .type           = MT_DEVICE,
  38         }, {
  39                 .virtual        = (unsigned long)S5P_VA_CMU,
  40                 .pfn            = __phys_to_pfn(S5PV310_PA_CMU),
  41                 .length         = SZ_128K,
  42                 .type           = MT_DEVICE,
  43         }, {
  44                 .virtual        = (unsigned long)S5P_VA_COMBINER_BASE,
  45                 .pfn            = __phys_to_pfn(S5PV310_PA_COMBINER),
  46                 .length         = SZ_4K,
  47                 .type           = MT_DEVICE,
  48         }, {
  49                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  50                 .pfn            = __phys_to_pfn(S5PV310_PA_COREPERI),
  51                 .length         = SZ_8K,
  52                 .type           = MT_DEVICE,
  53         }, {
  54                 .virtual        = (unsigned long)S5P_VA_L2CC,
  55                 .pfn            = __phys_to_pfn(S5PV310_PA_L2CC),
  56                 .length         = SZ_4K,
  57                 .type           = MT_DEVICE,
  58         }, {
  59                 .virtual        = (unsigned long)S5P_VA_GPIO1,
  60                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO1),
  61                 .length         = SZ_4K,
  62                 .type           = MT_DEVICE,
  63         }, {
  64                 .virtual        = (unsigned long)S5P_VA_GPIO2,
  65                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO2),
  66                 .length         = SZ_4K,
  67                 .type           = MT_DEVICE,
  68         }, {
  69                 .virtual        = (unsigned long)S5P_VA_GPIO3,
  70                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO3),
  71                 .length         = SZ_256,
  72                 .type           = MT_DEVICE,
  73         }, {
  74                 .virtual        = (unsigned long)S3C_VA_UART,
  75                 .pfn            = __phys_to_pfn(S3C_PA_UART),
  76                 .length         = SZ_512K,
  77                 .type           = MT_DEVICE,
  78         }, {
  79                 .virtual        = (unsigned long)S5P_VA_SROMC,
  80                 .pfn            = __phys_to_pfn(S5PV310_PA_SROMC),
  81                 .length         = SZ_4K,
  82                 .type           = MT_DEVICE,
  83         },
  84 };
  85
  86 static void s5pv310_idle(void)
  87 {
  88         if (!need_resched())
  89                 cpu_do_idle();
  90
  91         local_irq_enable();
  92 }
  93
  94 /* s5pv310_map_io
  95  *
  96  * register the standard cpu IO areas
  97 */
  98 void __init s5pv310_map_io(void)
  99 {
 100         iotable_init(s5pv310_iodesc, ARRAY_SIZE(s5pv310_iodesc));
 101
 102         /* initialize device information early */
 103         s5pv310_default_sdhci0();
 104         s5pv310_default_sdhci1();
 105         s5pv310_default_sdhci2();
 106         s5pv310_default_sdhci3();
 107 }
 108
 109 void __init s5pv310_init_clocks(int xtal)
 110 {
 111         printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
 112
 113         s3c24xx_register_baseclocks(xtal);
 114         s5p_register_clocks(xtal);
 115         s5pv310_register_clocks();
 116         s5pv310_setup_clocks();
 117 }
 118
 119 void __init s5pv310_init_irq(void)
 120 {
 121         int irq;
 122
 123         gic_init(0, IRQ_LOCALTIMER, S5P_VA_GIC_DIST, S5P_VA_GIC_CPU);
 124
 125         for (irq = 0; irq < MAX_COMBINER_NR; irq++) {
 126                 combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
 127                                 COMBINER_IRQ(irq, 0));
 128                 combiner_cascade_irq(irq, IRQ_SPI(irq));
 129         }
 130
 131         /* The parameters of s5p_init_irq() are for VIC init.
 132          * Theses parameters should be NULL and 0 because S5PV310
 133          * uses GIC instead of VIC.
 134          */
 135         s5p_init_irq(NULL, 0);
 136 }
 137
 138 struct sysdev_class s5pv310_sysclass = {
 139         .name   = "s5pv310-core",
 140 };
 141
 142 static struct sys_device s5pv310_sysdev = {
 143         .cls    = &s5pv310_sysclass,
 144 };
 145
 146 static int __init s5pv310_core_init(void)
 147 {
 148         return sysdev_class_register(&s5pv310_sysclass);
 149 }
 150
 151 core_initcall(s5pv310_core_init);
 152
 153 #ifdef CONFIG_CACHE_L2X0
 154 static int __init s5pv310_l2x0_cache_init(void)
 155 {
 156         /* TAG, Data Latency Control: 2cycle */
 157         __raw_writel(0x110, S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
 158         __raw_writel(0x110, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
 159
 160         /* L2X0 Prefetch Control */
 161         __raw_writel(0x30000007, S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
 162
 163         /* L2X0 Power Control */
 164         __raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN,
 165                      S5P_VA_L2CC + L2X0_POWER_CTRL);
 166
 167         l2x0_init(S5P_VA_L2CC, 0x7C070001, 0xC200ffff);
 168
 169         return 0;
 170 }
 171
 172 early_initcall(s5pv310_l2x0_cache_init);
 173 #endif
 174
 175 int __init s5pv310_init(void)
 176 {
 177         printk(KERN_INFO "S5PV310: Initializing architecture\n");
 178
 179         /* set idle function */
 180         pm_idle = s5pv310_idle;
 181
 182         return sysdev_register(&s5pv310_sysdev);
 183 }