arch/arm/mach-exynos/exynos.c

   1 /*
   2  * SAMSUNG EXYNOS Flattened Device Tree enabled machine
   3  *
   4  * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
   5  *              http://www.samsung.com
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/io.h>
  14 #include <linux/kernel.h>
  15 #include <linux/serial_s3c.h>
  16 #include <linux/of.h>
  17 #include <linux/of_address.h>
  18 #include <linux/of_fdt.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_domain.h>
  22 #include <linux/irqchip.h>
  23
  24 #include <asm/cacheflush.h>
  25 #include <asm/hardware/cache-l2x0.h>
  26 #include <asm/mach/arch.h>
  27 #include <asm/mach/map.h>
  28 #include <asm/memory.h>
  29
  30 #include <mach/map.h>
  31
  32 #include "common.h"
  33 #include "mfc.h"
  34 #include "regs-pmu.h"
  35
  36 void __iomem *pmu_base_addr;
  37
  38 static struct map_desc exynos4_iodesc[] __initdata = {
  39         {
  40                 .virtual        = (unsigned long)S5P_VA_SROMC,
  41                 .pfn            = __phys_to_pfn(EXYNOS4_PA_SROMC),
  42                 .length         = SZ_4K,
  43                 .type           = MT_DEVICE,
  44         }, {
  45                 .virtual        = (unsigned long)S5P_VA_CMU,
  46                 .pfn            = __phys_to_pfn(EXYNOS4_PA_CMU),
  47                 .length         = SZ_128K,
  48                 .type           = MT_DEVICE,
  49         }, {
  50                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  51                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  52                 .length         = SZ_8K,
  53                 .type           = MT_DEVICE,
  54         }, {
  55                 .virtual        = (unsigned long)S5P_VA_DMC0,
  56                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC0),
  57                 .length         = SZ_64K,
  58                 .type           = MT_DEVICE,
  59         }, {
  60                 .virtual        = (unsigned long)S5P_VA_DMC1,
  61                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC1),
  62                 .length         = SZ_64K,
  63                 .type           = MT_DEVICE,
  64         },
  65 };
  66
  67 static struct map_desc exynos5_iodesc[] __initdata = {
  68         {
  69                 .virtual        = (unsigned long)S5P_VA_SROMC,
  70                 .pfn            = __phys_to_pfn(EXYNOS5_PA_SROMC),
  71                 .length         = SZ_4K,
  72                 .type           = MT_DEVICE,
  73         }, {
  74                 .virtual        = (unsigned long)S5P_VA_CMU,
  75                 .pfn            = __phys_to_pfn(EXYNOS5_PA_CMU),
  76                 .length         = 144 * SZ_1K,
  77                 .type           = MT_DEVICE,
  78         },
  79 };
  80
  81 static struct platform_device exynos_cpuidle = {
  82         .name              = "exynos_cpuidle",
  83 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  84         .dev.platform_data = exynos_enter_aftr,
  85 #endif
  86         .id                = -1,
  87 };
  88
  89 void __iomem *sysram_base_addr;
  90 void __iomem *sysram_ns_base_addr;
  91
  92 void __init exynos_sysram_init(void)
  93 {
  94         struct device_node *node;
  95
  96         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  97                 if (!of_device_is_available(node))
  98                         continue;
  99                 sysram_base_addr = of_iomap(node, 0);
 100                 break;
 101         }
 102
 103         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
 104                 if (!of_device_is_available(node))
 105                         continue;
 106                 sysram_ns_base_addr = of_iomap(node, 0);
 107                 break;
 108         }
 109 }
 110
 111 static void __init exynos_init_late(void)
 112 {
 113         if (of_machine_is_compatible("samsung,exynos5440"))
 114                 /* to be supported later */
 115                 return;
 116
 117         exynos_pm_init();
 118 }
 119
 120 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
 121                                         int depth, void *data)
 122 {
 123         struct map_desc iodesc;
 124         const __be32 *reg;
 125         int len;
 126
 127         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
 128                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
 129                 return 0;
 130
 131         reg = of_get_flat_dt_prop(node, "reg", &len);
 132         if (reg == NULL || len != (sizeof(unsigned long) * 2))
 133                 return 0;
 134
 135         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
 136         iodesc.length = be32_to_cpu(reg[1]) - 1;
 137         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
 138         iodesc.type = MT_DEVICE;
 139         iotable_init(&iodesc, 1);
 140         return 1;
 141 }
 142
 143 /*
 144  * exynos_map_io
 145  *
 146  * register the standard cpu IO areas
 147  */
 148 static void __init exynos_map_io(void)
 149 {
 150         if (soc_is_exynos4())
 151                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 152
 153         if (soc_is_exynos5())
 154                 iotable_init(exynos5_iodesc, ARRAY_SIZE(exynos5_iodesc));
 155 }
 156
 157 static void __init exynos_init_io(void)
 158 {
 159         debug_ll_io_init();
 160
 161         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 162
 163         /* detect cpu id and rev. */
 164         s5p_init_cpu(S5P_VA_CHIPID);
 165
 166         exynos_map_io();
 167 }
 168
 169 static const struct of_device_id exynos_dt_pmu_match[] = {
 170         { .compatible = "samsung,exynos3250-pmu" },
 171         { .compatible = "samsung,exynos4210-pmu" },
 172         { .compatible = "samsung,exynos4212-pmu" },
 173         { .compatible = "samsung,exynos4412-pmu" },
 174         { .compatible = "samsung,exynos4415-pmu" },
 175         { .compatible = "samsung,exynos5250-pmu" },
 176         { .compatible = "samsung,exynos5260-pmu" },
 177         { .compatible = "samsung,exynos5410-pmu" },
 178         { .compatible = "samsung,exynos5420-pmu" },
 179         { /*sentinel*/ },
 180 };
 181
 182 static void exynos_map_pmu(void)
 183 {
 184         struct device_node *np;
 185
 186         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 187         if (np)
 188                 pmu_base_addr = of_iomap(np, 0);
 189
 190         if (!pmu_base_addr)
 191                 panic("failed to find exynos pmu register\n");
 192 }
 193
 194 static void __init exynos_init_irq(void)
 195 {
 196         irqchip_init();
 197         /*
 198          * Since platsmp.c needs pmu base address by the time
 199          * DT is not unflatten so we can't use DT APIs before
 200          * init_irq
 201          */
 202         exynos_map_pmu();
 203 }
 204
 205 static void __init exynos_dt_machine_init(void)
 206 {
 207         /*
 208          * This is called from smp_prepare_cpus if we've built for SMP, but
 209          * we still need to set it up for PM and firmware ops if not.
 210          */
 211         if (!IS_ENABLED(CONFIG_SMP))
 212                 exynos_sysram_init();
 213
 214 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 215         if (of_machine_is_compatible("samsung,exynos4210"))
 216                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 217 #endif
 218         if (of_machine_is_compatible("samsung,exynos4210") ||
 219             of_machine_is_compatible("samsung,exynos4212") ||
 220             (of_machine_is_compatible("samsung,exynos4412") &&
 221              of_machine_is_compatible("samsung,trats2")) ||
 222             of_machine_is_compatible("samsung,exynos5250"))
 223                 platform_device_register(&exynos_cpuidle);
 224
 225         platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
 226
 227         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 228 }
 229
 230 static char const *const exynos_dt_compat[] __initconst = {
 231         "samsung,exynos3",
 232         "samsung,exynos3250",
 233         "samsung,exynos4",
 234         "samsung,exynos4210",
 235         "samsung,exynos4212",
 236         "samsung,exynos4412",
 237         "samsung,exynos4415",
 238         "samsung,exynos5",
 239         "samsung,exynos5250",
 240         "samsung,exynos5260",
 241         "samsung,exynos5420",
 242         "samsung,exynos5440",
 243         NULL
 244 };
 245
 246 static void __init exynos_reserve(void)
 247 {
 248 #ifdef CONFIG_S5P_DEV_MFC
 249         int i;
 250         char *mfc_mem[] = {
 251                 "samsung,mfc-v5",
 252                 "samsung,mfc-v6",
 253                 "samsung,mfc-v7",
 254                 "samsung,mfc-v8",
 255         };
 256
 257         for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 258                 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 259                         break;
 260 #endif
 261 }
 262
 263 static void __init exynos_dt_fixup(void)
 264 {
 265         /*
 266          * Some versions of uboot pass garbage entries in the memory node,
 267          * use the old CONFIG_ARM_NR_BANKS
 268          */
 269         of_fdt_limit_memory(8);
 270 }
 271
 272 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 273         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 274         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 275         .l2c_aux_val    = 0x3c400001,
 276         .l2c_aux_mask   = 0xc20fffff,
 277         .smp            = smp_ops(exynos_smp_ops),
 278         .map_io         = exynos_init_io,
 279         .init_early     = exynos_firmware_init,
 280         .init_irq       = exynos_init_irq,
 281         .init_machine   = exynos_dt_machine_init,
 282         .init_late      = exynos_init_late,
 283         .dt_compat      = exynos_dt_compat,
 284         .reserve        = exynos_reserve,
 285         .dt_fixup       = exynos_dt_fixup,
 286 MACHINE_END