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_CMU,
  41                 .pfn            = __phys_to_pfn(EXYNOS4_PA_CMU),
  42                 .length         = SZ_128K,
  43                 .type           = MT_DEVICE,
  44         }, {
  45                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  46                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  47                 .length         = SZ_8K,
  48                 .type           = MT_DEVICE,
  49         }, {
  50                 .virtual        = (unsigned long)S5P_VA_DMC0,
  51                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC0),
  52                 .length         = SZ_64K,
  53                 .type           = MT_DEVICE,
  54         }, {
  55                 .virtual        = (unsigned long)S5P_VA_DMC1,
  56                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC1),
  57                 .length         = SZ_64K,
  58                 .type           = MT_DEVICE,
  59         },
  60 };
  61
  62 static struct platform_device exynos_cpuidle = {
  63         .name              = "exynos_cpuidle",
  64 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  65         .dev.platform_data = exynos_enter_aftr,
  66 #endif
  67         .id                = -1,
  68 };
  69
  70 void __iomem *sysram_base_addr;
  71 void __iomem *sysram_ns_base_addr;
  72
  73 void __init exynos_sysram_init(void)
  74 {
  75         struct device_node *node;
  76
  77         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  78                 if (!of_device_is_available(node))
  79                         continue;
  80                 sysram_base_addr = of_iomap(node, 0);
  81                 break;
  82         }
  83
  84         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  85                 if (!of_device_is_available(node))
  86                         continue;
  87                 sysram_ns_base_addr = of_iomap(node, 0);
  88                 break;
  89         }
  90 }
  91
  92 static void __init exynos_init_late(void)
  93 {
  94         if (of_machine_is_compatible("samsung,exynos5440"))
  95                 /* to be supported later */
  96                 return;
  97
  98         exynos_pm_init();
  99 }
 100
 101 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
 102                                         int depth, void *data)
 103 {
 104         struct map_desc iodesc;
 105         const __be32 *reg;
 106         int len;
 107
 108         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
 109                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
 110                 return 0;
 111
 112         reg = of_get_flat_dt_prop(node, "reg", &len);
 113         if (reg == NULL || len != (sizeof(unsigned long) * 2))
 114                 return 0;
 115
 116         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
 117         iodesc.length = be32_to_cpu(reg[1]) - 1;
 118         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
 119         iodesc.type = MT_DEVICE;
 120         iotable_init(&iodesc, 1);
 121         return 1;
 122 }
 123
 124 /*
 125  * exynos_map_io
 126  *
 127  * register the standard cpu IO areas
 128  */
 129 static void __init exynos_map_io(void)
 130 {
 131         if (soc_is_exynos4())
 132                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 133 }
 134
 135 static void __init exynos_init_io(void)
 136 {
 137         debug_ll_io_init();
 138
 139         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 140
 141         /* detect cpu id and rev. */
 142         s5p_init_cpu(S5P_VA_CHIPID);
 143
 144         exynos_map_io();
 145 }
 146
 147 /*
 148  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 149  * and suspend.
 150  *
 151  * This is necessary only on Exynos4 SoCs. When system is running
 152  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 153  * feature could properly detect global idle state when secondary CPU is
 154  * powered down.
 155  *
 156  * However this should not be set when such system is going into suspend.
 157  */
 158 void exynos_set_delayed_reset_assertion(bool enable)
 159 {
 160         if (of_machine_is_compatible("samsung,exynos4")) {
 161                 unsigned int tmp, core_id;
 162
 163                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 164                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 165                         if (enable)
 166                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 167                         else
 168                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 169                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 170                 }
 171         }
 172 }
 173
 174 /*
 175  * Apparently, these SoCs are not able to wake-up from suspend using
 176  * the PMU. Too bad. Should they suddenly become capable of such a
 177  * feat, the matches below should be moved to suspend.c.
 178  */
 179 static const struct of_device_id exynos_dt_pmu_match[] = {
 180         { .compatible = "samsung,exynos5260-pmu" },
 181         { .compatible = "samsung,exynos5410-pmu" },
 182         { /*sentinel*/ },
 183 };
 184
 185 static void exynos_map_pmu(void)
 186 {
 187         struct device_node *np;
 188
 189         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 190         if (np)
 191                 pmu_base_addr = of_iomap(np, 0);
 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 const struct of_device_id exynos_cpufreq_matches[] = {
 206         { .compatible = "samsung,exynos3250", .data = "cpufreq-dt" },
 207         { .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
 208         { .compatible = "samsung,exynos4212", .data = "cpufreq-dt" },
 209         { .compatible = "samsung,exynos4412", .data = "cpufreq-dt" },
 210         { .compatible = "samsung,exynos5250", .data = "cpufreq-dt" },
 211         { /* sentinel */ }
 212 };
 213
 214 static void __init exynos_cpufreq_init(void)
 215 {
 216         struct device_node *root = of_find_node_by_path("/");
 217         const struct of_device_id *match;
 218
 219         match = of_match_node(exynos_cpufreq_matches, root);
 220         if (!match) {
 221                 platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
 222                 return;
 223         }
 224
 225         platform_device_register_simple(match->data, -1, NULL, 0);
 226 }
 227
 228 static void __init exynos_dt_machine_init(void)
 229 {
 230         /*
 231          * This is called from smp_prepare_cpus if we've built for SMP, but
 232          * we still need to set it up for PM and firmware ops if not.
 233          */
 234         if (!IS_ENABLED(CONFIG_SMP))
 235                 exynos_sysram_init();
 236
 237 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 238         if (of_machine_is_compatible("samsung,exynos4210") ||
 239             of_machine_is_compatible("samsung,exynos3250"))
 240                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 241 #endif
 242         if (of_machine_is_compatible("samsung,exynos4210") ||
 243             of_machine_is_compatible("samsung,exynos4212") ||
 244             (of_machine_is_compatible("samsung,exynos4412") &&
 245              of_machine_is_compatible("samsung,trats2")) ||
 246             of_machine_is_compatible("samsung,exynos3250") ||
 247             of_machine_is_compatible("samsung,exynos5250"))
 248                 platform_device_register(&exynos_cpuidle);
 249
 250         exynos_cpufreq_init();
 251
 252         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 253 }
 254
 255 static char const *const exynos_dt_compat[] __initconst = {
 256         "samsung,exynos3",
 257         "samsung,exynos3250",
 258         "samsung,exynos4",
 259         "samsung,exynos4210",
 260         "samsung,exynos4212",
 261         "samsung,exynos4412",
 262         "samsung,exynos4415",
 263         "samsung,exynos5",
 264         "samsung,exynos5250",
 265         "samsung,exynos5260",
 266         "samsung,exynos5420",
 267         "samsung,exynos5440",
 268         NULL
 269 };
 270
 271 static void __init exynos_reserve(void)
 272 {
 273 #ifdef CONFIG_S5P_DEV_MFC
 274         int i;
 275         char *mfc_mem[] = {
 276                 "samsung,mfc-v5",
 277                 "samsung,mfc-v6",
 278                 "samsung,mfc-v7",
 279                 "samsung,mfc-v8",
 280         };
 281
 282         for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 283                 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 284                         break;
 285 #endif
 286 }
 287
 288 static void __init exynos_dt_fixup(void)
 289 {
 290         /*
 291          * Some versions of uboot pass garbage entries in the memory node,
 292          * use the old CONFIG_ARM_NR_BANKS
 293          */
 294         of_fdt_limit_memory(8);
 295 }
 296
 297 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 298         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 299         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 300         .l2c_aux_val    = 0x3c400001,
 301         .l2c_aux_mask   = 0xc20fffff,
 302         .smp            = smp_ops(exynos_smp_ops),
 303         .map_io         = exynos_init_io,
 304         .init_early     = exynos_firmware_init,
 305         .init_irq       = exynos_init_irq,
 306         .init_machine   = exynos_dt_machine_init,
 307         .init_late      = exynos_init_late,
 308         .dt_compat      = exynos_dt_compat,
 309         .reserve        = exynos_reserve,
 310         .dt_fixup       = exynos_dt_fixup,
 311 MACHINE_END