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  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 171  * and suspend.
 172  *
 173  * This is necessary only on Exynos4 SoCs. When system is running
 174  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 175  * feature could properly detect global idle state when secondary CPU is
 176  * powered down.
 177  *
 178  * However this should not be set when such system is going into suspend.
 179  */
 180 void exynos_set_delayed_reset_assertion(bool enable)
 181 {
 182         if (of_machine_is_compatible("samsung,exynos4")) {
 183                 unsigned int tmp, core_id;
 184
 185                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 186                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 187                         if (enable)
 188                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 189                         else
 190                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 191                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 192                 }
 193         }
 194 }
 195
 196 /*
 197  * Apparently, these SoCs are not able to wake-up from suspend using
 198  * the PMU. Too bad. Should they suddenly become capable of such a
 199  * feat, the matches below should be moved to suspend.c.
 200  */
 201 static const struct of_device_id exynos_dt_pmu_match[] = {
 202         { .compatible = "samsung,exynos5260-pmu" },
 203         { .compatible = "samsung,exynos5410-pmu" },
 204         { /*sentinel*/ },
 205 };
 206
 207 static void exynos_map_pmu(void)
 208 {
 209         struct device_node *np;
 210
 211         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 212         if (np)
 213                 pmu_base_addr = of_iomap(np, 0);
 214 }
 215
 216 static void __init exynos_init_irq(void)
 217 {
 218         irqchip_init();
 219         /*
 220          * Since platsmp.c needs pmu base address by the time
 221          * DT is not unflatten so we can't use DT APIs before
 222          * init_irq
 223          */
 224         exynos_map_pmu();
 225 }
 226
 227 static const struct of_device_id exynos_cpufreq_matches[] = {
 228         { .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
 229         { /* sentinel */ }
 230 };
 231
 232 static void __init exynos_cpufreq_init(void)
 233 {
 234         struct device_node *root = of_find_node_by_path("/");
 235         const struct of_device_id *match;
 236
 237         match = of_match_node(exynos_cpufreq_matches, root);
 238         if (!match) {
 239                 platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
 240                 return;
 241         }
 242
 243         platform_device_register_simple(match->data, -1, NULL, 0);
 244 }
 245
 246 static void __init exynos_dt_machine_init(void)
 247 {
 248         /*
 249          * This is called from smp_prepare_cpus if we've built for SMP, but
 250          * we still need to set it up for PM and firmware ops if not.
 251          */
 252         if (!IS_ENABLED(CONFIG_SMP))
 253                 exynos_sysram_init();
 254
 255 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 256         if (of_machine_is_compatible("samsung,exynos4210") ||
 257             of_machine_is_compatible("samsung,exynos3250"))
 258                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 259 #endif
 260         if (of_machine_is_compatible("samsung,exynos4210") ||
 261             of_machine_is_compatible("samsung,exynos4212") ||
 262             (of_machine_is_compatible("samsung,exynos4412") &&
 263              of_machine_is_compatible("samsung,trats2")) ||
 264             of_machine_is_compatible("samsung,exynos3250") ||
 265             of_machine_is_compatible("samsung,exynos5250"))
 266                 platform_device_register(&exynos_cpuidle);
 267
 268         exynos_cpufreq_init();
 269
 270         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 271 }
 272
 273 static char const *const exynos_dt_compat[] __initconst = {
 274         "samsung,exynos3",
 275         "samsung,exynos3250",
 276         "samsung,exynos4",
 277         "samsung,exynos4210",
 278         "samsung,exynos4212",
 279         "samsung,exynos4412",
 280         "samsung,exynos4415",
 281         "samsung,exynos5",
 282         "samsung,exynos5250",
 283         "samsung,exynos5260",
 284         "samsung,exynos5420",
 285         "samsung,exynos5440",
 286         NULL
 287 };
 288
 289 static void __init exynos_reserve(void)
 290 {
 291 #ifdef CONFIG_S5P_DEV_MFC
 292         int i;
 293         char *mfc_mem[] = {
 294                 "samsung,mfc-v5",
 295                 "samsung,mfc-v6",
 296                 "samsung,mfc-v7",
 297                 "samsung,mfc-v8",
 298         };
 299
 300         for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 301                 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 302                         break;
 303 #endif
 304 }
 305
 306 static void __init exynos_dt_fixup(void)
 307 {
 308         /*
 309          * Some versions of uboot pass garbage entries in the memory node,
 310          * use the old CONFIG_ARM_NR_BANKS
 311          */
 312         of_fdt_limit_memory(8);
 313 }
 314
 315 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 316         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 317         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 318         .l2c_aux_val    = 0x3c400001,
 319         .l2c_aux_mask   = 0xc20fffff,
 320         .smp            = smp_ops(exynos_smp_ops),
 321         .map_io         = exynos_init_io,
 322         .init_early     = exynos_firmware_init,
 323         .init_irq       = exynos_init_irq,
 324         .init_machine   = exynos_dt_machine_init,
 325         .init_late      = exynos_init_late,
 326         .dt_compat      = exynos_dt_compat,
 327         .reserve        = exynos_reserve,
 328         .dt_fixup       = exynos_dt_fixup,
 329 MACHINE_END