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 void __iomem *gic_cpu_base_addr;
  28
  29 extern int combiner_init(unsigned int combiner_nr, void __iomem *base,
  30                          unsigned int irq_start);
  31 extern void combiner_cascade_irq(unsigned int combiner_nr, unsigned int irq);
  32
  33 /* Initial IO mappings */
  34 static struct map_desc s5pv310_iodesc[] __initdata = {
  35         {
  36                 .virtual        = (unsigned long)S5P_VA_SYSRAM,
  37                 .pfn            = __phys_to_pfn(S5PV310_PA_SYSRAM),
  38                 .length         = SZ_4K,
  39                 .type           = MT_DEVICE,
  40         }, {
  41                 .virtual        = (unsigned long)S5P_VA_CMU,
  42                 .pfn            = __phys_to_pfn(S5PV310_PA_CMU),
  43                 .length         = SZ_128K,
  44                 .type           = MT_DEVICE,
  45         }, {
  46                 .virtual        = (unsigned long)S5P_VA_COMBINER_BASE,
  47                 .pfn            = __phys_to_pfn(S5PV310_PA_COMBINER),
  48                 .length         = SZ_4K,
  49                 .type           = MT_DEVICE,
  50         }, {
  51                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  52                 .pfn            = __phys_to_pfn(S5PV310_PA_COREPERI),
  53                 .length         = SZ_8K,
  54                 .type           = MT_DEVICE,
  55         }, {
  56                 .virtual        = (unsigned long)S5P_VA_L2CC,
  57                 .pfn            = __phys_to_pfn(S5PV310_PA_L2CC),
  58                 .length         = SZ_4K,
  59                 .type           = MT_DEVICE,
  60         }, {
  61                 .virtual        = (unsigned long)S5P_VA_GPIO1,
  62                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO1),
  63                 .length         = SZ_4K,
  64                 .type           = MT_DEVICE,
  65         }, {
  66                 .virtual        = (unsigned long)S5P_VA_GPIO2,
  67                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO2),
  68                 .length         = SZ_4K,
  69                 .type           = MT_DEVICE,
  70         }, {
  71                 .virtual        = (unsigned long)S5P_VA_GPIO3,
  72                 .pfn            = __phys_to_pfn(S5PV310_PA_GPIO3),
  73                 .length         = SZ_256,
  74                 .type           = MT_DEVICE,
  75         }, {
  76                 .virtual        = (unsigned long)S3C_VA_UART,
  77                 .pfn            = __phys_to_pfn(S3C_PA_UART),
  78                 .length         = SZ_512K,
  79                 .type           = MT_DEVICE,
  80         }, {
  81                 .virtual        = (unsigned long)S5P_VA_SROMC,
  82                 .pfn            = __phys_to_pfn(S5PV310_PA_SROMC),
  83                 .length         = SZ_4K,
  84                 .type           = MT_DEVICE,
  85         },
  86 };
  87
  88 static void s5pv310_idle(void)
  89 {
  90         if (!need_resched())
  91                 cpu_do_idle();
  92
  93         local_irq_enable();
  94 }
  95
  96 /* s5pv310_map_io
  97  *
  98  * register the standard cpu IO areas
  99 */
 100 void __init s5pv310_map_io(void)
 101 {
 102         iotable_init(s5pv310_iodesc, ARRAY_SIZE(s5pv310_iodesc));
 103
 104         /* initialize device information early */
 105         s5pv310_default_sdhci0();
 106         s5pv310_default_sdhci1();
 107         s5pv310_default_sdhci2();
 108         s5pv310_default_sdhci3();
 109 }
 110
 111 void __init s5pv310_init_clocks(int xtal)
 112 {
 113         printk(KERN_DEBUG "%s: initializing clocks\n", __func__);
 114
 115         s3c24xx_register_baseclocks(xtal);
 116         s5p_register_clocks(xtal);
 117         s5pv310_register_clocks();
 118         s5pv310_setup_clocks();
 119 }
 120
 121 void __init s5pv310_init_irq(void)
 122 {
 123         int irq;
 124
 125         gic_cpu_base_addr = S5P_VA_GIC_CPU;
 126         gic_dist_init(0, S5P_VA_GIC_DIST, IRQ_LOCALTIMER);
 127         gic_cpu_init(0, S5P_VA_GIC_CPU);
 128
 129         for (irq = 0; irq < MAX_COMBINER_NR; irq++) {
 130                 combiner_init(irq, (void __iomem *)S5P_VA_COMBINER(irq),
 131                                 COMBINER_IRQ(irq, 0));
 132                 combiner_cascade_irq(irq, IRQ_SPI(irq));
 133         }
 134
 135         /* The parameters of s5p_init_irq() are for VIC init.
 136          * Theses parameters should be NULL and 0 because S5PV310
 137          * uses GIC instead of VIC.
 138          */
 139         s5p_init_irq(NULL, 0);
 140 }
 141
 142 struct sysdev_class s5pv310_sysclass = {
 143         .name   = "s5pv310-core",
 144 };
 145
 146 static struct sys_device s5pv310_sysdev = {
 147         .cls    = &s5pv310_sysclass,
 148 };
 149
 150 static int __init s5pv310_core_init(void)
 151 {
 152         return sysdev_class_register(&s5pv310_sysclass);
 153 }
 154
 155 core_initcall(s5pv310_core_init);
 156
 157 #ifdef CONFIG_CACHE_L2X0
 158 static int __init s5pv310_l2x0_cache_init(void)
 159 {
 160         /* TAG, Data Latency Control: 2cycle */
 161         __raw_writel(0x110, S5P_VA_L2CC + L2X0_TAG_LATENCY_CTRL);
 162         __raw_writel(0x110, S5P_VA_L2CC + L2X0_DATA_LATENCY_CTRL);
 163
 164         /* L2X0 Prefetch Control */
 165         __raw_writel(0x30000007, S5P_VA_L2CC + L2X0_PREFETCH_CTRL);
 166
 167         /* L2X0 Power Control */
 168         __raw_writel(L2X0_DYNAMIC_CLK_GATING_EN | L2X0_STNDBY_MODE_EN,
 169                      S5P_VA_L2CC + L2X0_POWER_CTRL);
 170
 171         l2x0_init(S5P_VA_L2CC, 0x7C070001, 0xC200ffff);
 172
 173         return 0;
 174 }
 175
 176 early_initcall(s5pv310_l2x0_cache_init);
 177 #endif
 178
 179 int __init s5pv310_init(void)
 180 {
 181         printk(KERN_INFO "S5PV310: Initializing architecture\n");
 182
 183         /* set idle function */
 184         pm_idle = s5pv310_idle;
 185
 186         return sysdev_register(&s5pv310_sysdev);
 187 }