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/of.h>
  15 #include <linux/of_address.h>
  16 #include <linux/of_fdt.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/irqchip.h>
  19 #include <linux/soc/samsung/exynos-regs-pmu.h>
  20
  21 #include <asm/cacheflush.h>
  22 #include <asm/hardware/cache-l2x0.h>
  23 #include <asm/mach/arch.h>
  24 #include <asm/mach/map.h>
  25
  26 #include <mach/map.h>
  27 #include <plat/cpu.h>
  28
  29 #include "common.h"
  30
  31 static struct map_desc exynos4_iodesc[] __initdata = {
  32         {
  33                 .virtual        = (unsigned long)S5P_VA_CMU,
  34                 .pfn            = __phys_to_pfn(EXYNOS4_PA_CMU),
  35                 .length         = SZ_128K,
  36                 .type           = MT_DEVICE,
  37         }, {
  38                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  39                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  40                 .length         = SZ_8K,
  41                 .type           = MT_DEVICE,
  42         }, {
  43                 .virtual        = (unsigned long)S5P_VA_DMC0,
  44                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC0),
  45                 .length         = SZ_64K,
  46                 .type           = MT_DEVICE,
  47         }, {
  48                 .virtual        = (unsigned long)S5P_VA_DMC1,
  49                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC1),
  50                 .length         = SZ_64K,
  51                 .type           = MT_DEVICE,
  52         },
  53 };
  54
  55 static struct platform_device exynos_cpuidle = {
  56         .name              = "exynos_cpuidle",
  57 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  58         .dev.platform_data = exynos_enter_aftr,
  59 #endif
  60         .id                = -1,
  61 };
  62
  63 void __iomem *sysram_base_addr;
  64 void __iomem *sysram_ns_base_addr;
  65
  66 void __init exynos_sysram_init(void)
  67 {
  68         struct device_node *node;
  69
  70         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  71                 if (!of_device_is_available(node))
  72                         continue;
  73                 sysram_base_addr = of_iomap(node, 0);
  74                 break;
  75         }
  76
  77         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  78                 if (!of_device_is_available(node))
  79                         continue;
  80                 sysram_ns_base_addr = of_iomap(node, 0);
  81                 break;
  82         }
  83 }
  84
  85 static void __init exynos_init_late(void)
  86 {
  87         if (of_machine_is_compatible("samsung,exynos5440"))
  88                 /* to be supported later */
  89                 return;
  90
  91         exynos_pm_init();
  92 }
  93
  94 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
  95                                         int depth, void *data)
  96 {
  97         struct map_desc iodesc;
  98         const __be32 *reg;
  99         int len;
 100
 101         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
 102                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
 103                 return 0;
 104
 105         reg = of_get_flat_dt_prop(node, "reg", &len);
 106         if (reg == NULL || len != (sizeof(unsigned long) * 2))
 107                 return 0;
 108
 109         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
 110         iodesc.length = be32_to_cpu(reg[1]) - 1;
 111         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
 112         iodesc.type = MT_DEVICE;
 113         iotable_init(&iodesc, 1);
 114         return 1;
 115 }
 116
 117 /*
 118  * exynos_map_io
 119  *
 120  * register the standard cpu IO areas
 121  */
 122 static void __init exynos_map_io(void)
 123 {
 124         if (soc_is_exynos4())
 125                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 126 }
 127
 128 static void __init exynos_init_io(void)
 129 {
 130         debug_ll_io_init();
 131
 132         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 133
 134         /* detect cpu id and rev. */
 135         s5p_init_cpu(S5P_VA_CHIPID);
 136
 137         exynos_map_io();
 138 }
 139
 140 /*
 141  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 142  * and suspend.
 143  *
 144  * This is necessary only on Exynos4 SoCs. When system is running
 145  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 146  * feature could properly detect global idle state when secondary CPU is
 147  * powered down.
 148  *
 149  * However this should not be set when such system is going into suspend.
 150  */
 151 void exynos_set_delayed_reset_assertion(bool enable)
 152 {
 153         if (of_machine_is_compatible("samsung,exynos4")) {
 154                 unsigned int tmp, core_id;
 155
 156                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 157                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 158                         if (enable)
 159                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 160                         else
 161                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 162                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 163                 }
 164         }
 165 }
 166
 167 /*
 168  * Apparently, these SoCs are not able to wake-up from suspend using
 169  * the PMU. Too bad. Should they suddenly become capable of such a
 170  * feat, the matches below should be moved to suspend.c.
 171  */
 172 static const struct of_device_id exynos_dt_pmu_match[] = {
 173         { .compatible = "samsung,exynos5260-pmu" },
 174         { .compatible = "samsung,exynos5410-pmu" },
 175         { /*sentinel*/ },
 176 };
 177
 178 static void exynos_map_pmu(void)
 179 {
 180         struct device_node *np;
 181
 182         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 183         if (np)
 184                 pmu_base_addr = of_iomap(np, 0);
 185 }
 186
 187 static void __init exynos_init_irq(void)
 188 {
 189         irqchip_init();
 190         /*
 191          * Since platsmp.c needs pmu base address by the time
 192          * DT is not unflatten so we can't use DT APIs before
 193          * init_irq
 194          */
 195         exynos_map_pmu();
 196 }
 197
 198 static void __init exynos_dt_machine_init(void)
 199 {
 200         /*
 201          * This is called from smp_prepare_cpus if we've built for SMP, but
 202          * we still need to set it up for PM and firmware ops if not.
 203          */
 204         if (!IS_ENABLED(CONFIG_SMP))
 205                 exynos_sysram_init();
 206
 207 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 208         if (of_machine_is_compatible("samsung,exynos4210") ||
 209             of_machine_is_compatible("samsung,exynos3250"))
 210                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 211 #endif
 212         if (of_machine_is_compatible("samsung,exynos4210") ||
 213             of_machine_is_compatible("samsung,exynos4212") ||
 214             (of_machine_is_compatible("samsung,exynos4412") &&
 215              of_machine_is_compatible("samsung,trats2")) ||
 216             of_machine_is_compatible("samsung,exynos3250") ||
 217             of_machine_is_compatible("samsung,exynos5250"))
 218                 platform_device_register(&exynos_cpuidle);
 219 }
 220
 221 static char const *const exynos_dt_compat[] __initconst = {
 222         "samsung,exynos3",
 223         "samsung,exynos3250",
 224         "samsung,exynos4",
 225         "samsung,exynos4210",
 226         "samsung,exynos4212",
 227         "samsung,exynos4412",
 228         "samsung,exynos4415",
 229         "samsung,exynos5",
 230         "samsung,exynos5250",
 231         "samsung,exynos5260",
 232         "samsung,exynos5420",
 233         "samsung,exynos5440",
 234         NULL
 235 };
 236
 237 static void __init exynos_dt_fixup(void)
 238 {
 239         /*
 240          * Some versions of uboot pass garbage entries in the memory node,
 241          * use the old CONFIG_ARM_NR_BANKS
 242          */
 243         of_fdt_limit_memory(8);
 244 }
 245
 246 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 247         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 248         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 249         .l2c_aux_val    = 0x3c400001,
 250         .l2c_aux_mask   = 0xc20fffff,
 251         .smp            = smp_ops(exynos_smp_ops),
 252         .map_io         = exynos_init_io,
 253         .init_early     = exynos_firmware_init,
 254         .init_irq       = exynos_init_irq,
 255         .init_machine   = exynos_dt_machine_init,
 256         .init_late      = exynos_init_late,
 257         .dt_compat      = exynos_dt_compat,
 258         .dt_fixup       = exynos_dt_fixup,
 259 MACHINE_END