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 /*
 170  * Apparently, these SoCs are not able to wake-up from suspend using
 171  * the PMU. Too bad. Should they suddenly become capable of such a
 172  * feat, the matches below should be moved to suspend.c.
 173  */
 174 static const struct of_device_id exynos_dt_pmu_match[] = {
 175         { .compatible = "samsung,exynos5260-pmu" },
 176         { .compatible = "samsung,exynos5410-pmu" },
 177         { /*sentinel*/ },
 178 };
 179
 180 static void exynos_map_pmu(void)
 181 {
 182         struct device_node *np;
 183
 184         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 185         if (np)
 186                 pmu_base_addr = of_iomap(np, 0);
 187 }
 188
 189 static void __init exynos_init_irq(void)
 190 {
 191         irqchip_init();
 192         /*
 193          * Since platsmp.c needs pmu base address by the time
 194          * DT is not unflatten so we can't use DT APIs before
 195          * init_irq
 196          */
 197         exynos_map_pmu();
 198 }
 199
 200 static void __init exynos_dt_machine_init(void)
 201 {
 202         /*
 203          * This is called from smp_prepare_cpus if we've built for SMP, but
 204          * we still need to set it up for PM and firmware ops if not.
 205          */
 206         if (!IS_ENABLED(CONFIG_SMP))
 207                 exynos_sysram_init();
 208
 209 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 210         if (of_machine_is_compatible("samsung,exynos4210"))
 211                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 212 #endif
 213         if (of_machine_is_compatible("samsung,exynos4210") ||
 214             of_machine_is_compatible("samsung,exynos4212") ||
 215             (of_machine_is_compatible("samsung,exynos4412") &&
 216              of_machine_is_compatible("samsung,trats2")) ||
 217             of_machine_is_compatible("samsung,exynos3250") ||
 218             of_machine_is_compatible("samsung,exynos5250"))
 219                 platform_device_register(&exynos_cpuidle);
 220
 221         platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
 222
 223         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 224 }
 225
 226 static char const *const exynos_dt_compat[] __initconst = {
 227         "samsung,exynos3",
 228         "samsung,exynos3250",
 229         "samsung,exynos4",
 230         "samsung,exynos4210",
 231         "samsung,exynos4212",
 232         "samsung,exynos4412",
 233         "samsung,exynos4415",
 234         "samsung,exynos5",
 235         "samsung,exynos5250",
 236         "samsung,exynos5260",
 237         "samsung,exynos5420",
 238         "samsung,exynos5440",
 239         NULL
 240 };
 241
 242 static void __init exynos_reserve(void)
 243 {
 244 #ifdef CONFIG_S5P_DEV_MFC
 245         int i;
 246         char *mfc_mem[] = {
 247                 "samsung,mfc-v5",
 248                 "samsung,mfc-v6",
 249                 "samsung,mfc-v7",
 250                 "samsung,mfc-v8",
 251         };
 252
 253         for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 254                 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 255                         break;
 256 #endif
 257 }
 258
 259 static void __init exynos_dt_fixup(void)
 260 {
 261         /*
 262          * Some versions of uboot pass garbage entries in the memory node,
 263          * use the old CONFIG_ARM_NR_BANKS
 264          */
 265         of_fdt_limit_memory(8);
 266 }
 267
 268 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 269         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 270         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 271         .l2c_aux_val    = 0x3c400001,
 272         .l2c_aux_mask   = 0xc20fffff,
 273         .smp            = smp_ops(exynos_smp_ops),
 274         .map_io         = exynos_init_io,
 275         .init_early     = exynos_firmware_init,
 276         .init_irq       = exynos_init_irq,
 277         .init_machine   = exynos_dt_machine_init,
 278         .init_late      = exynos_init_late,
 279         .dt_compat      = exynos_dt_compat,
 280         .reserve        = exynos_reserve,
 281         .dt_fixup       = exynos_dt_fixup,
 282 MACHINE_END