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/of_platform.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/irqchip.h>
  20 #include <linux/soc/samsung/exynos-regs-pmu.h>
  21
  22 #include <asm/cacheflush.h>
  23 #include <asm/hardware/cache-l2x0.h>
  24 #include <asm/mach/arch.h>
  25 #include <asm/mach/map.h>
  26
  27 #include <mach/map.h>
  28
  29 #include "common.h"
  30 #include "mfc.h"
  31
  32 static struct map_desc exynos4_iodesc[] __initdata = {
  33         {
  34                 .virtual        = (unsigned long)S5P_VA_SROMC,
  35                 .pfn            = __phys_to_pfn(EXYNOS4_PA_SROMC),
  36                 .length         = SZ_4K,
  37                 .type           = MT_DEVICE,
  38         }, {
  39                 .virtual        = (unsigned long)S5P_VA_CMU,
  40                 .pfn            = __phys_to_pfn(EXYNOS4_PA_CMU),
  41                 .length         = SZ_128K,
  42                 .type           = MT_DEVICE,
  43         }, {
  44                 .virtual        = (unsigned long)S5P_VA_COREPERI_BASE,
  45                 .pfn            = __phys_to_pfn(EXYNOS4_PA_COREPERI),
  46                 .length         = SZ_8K,
  47                 .type           = MT_DEVICE,
  48         }, {
  49                 .virtual        = (unsigned long)S5P_VA_DMC0,
  50                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC0),
  51                 .length         = SZ_64K,
  52                 .type           = MT_DEVICE,
  53         }, {
  54                 .virtual        = (unsigned long)S5P_VA_DMC1,
  55                 .pfn            = __phys_to_pfn(EXYNOS4_PA_DMC1),
  56                 .length         = SZ_64K,
  57                 .type           = MT_DEVICE,
  58         },
  59 };
  60
  61 static struct map_desc exynos5_iodesc[] __initdata = {
  62         {
  63                 .virtual        = (unsigned long)S5P_VA_SROMC,
  64                 .pfn            = __phys_to_pfn(EXYNOS5_PA_SROMC),
  65                 .length         = SZ_4K,
  66                 .type           = MT_DEVICE,
  67         },
  68 };
  69
  70 static struct platform_device exynos_cpuidle = {
  71         .name              = "exynos_cpuidle",
  72 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE
  73         .dev.platform_data = exynos_enter_aftr,
  74 #endif
  75         .id                = -1,
  76 };
  77
  78 void __iomem *sysram_base_addr;
  79 void __iomem *sysram_ns_base_addr;
  80
  81 void __init exynos_sysram_init(void)
  82 {
  83         struct device_node *node;
  84
  85         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
  86                 if (!of_device_is_available(node))
  87                         continue;
  88                 sysram_base_addr = of_iomap(node, 0);
  89                 break;
  90         }
  91
  92         for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
  93                 if (!of_device_is_available(node))
  94                         continue;
  95                 sysram_ns_base_addr = of_iomap(node, 0);
  96                 break;
  97         }
  98 }
  99
 100 static void __init exynos_init_late(void)
 101 {
 102         if (of_machine_is_compatible("samsung,exynos5440"))
 103                 /* to be supported later */
 104                 return;
 105
 106         exynos_pm_init();
 107 }
 108
 109 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
 110                                         int depth, void *data)
 111 {
 112         struct map_desc iodesc;
 113         const __be32 *reg;
 114         int len;
 115
 116         if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
 117                 !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
 118                 return 0;
 119
 120         reg = of_get_flat_dt_prop(node, "reg", &len);
 121         if (reg == NULL || len != (sizeof(unsigned long) * 2))
 122                 return 0;
 123
 124         iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
 125         iodesc.length = be32_to_cpu(reg[1]) - 1;
 126         iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
 127         iodesc.type = MT_DEVICE;
 128         iotable_init(&iodesc, 1);
 129         return 1;
 130 }
 131
 132 /*
 133  * exynos_map_io
 134  *
 135  * register the standard cpu IO areas
 136  */
 137 static void __init exynos_map_io(void)
 138 {
 139         if (soc_is_exynos4())
 140                 iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
 141
 142         if (soc_is_exynos5())
 143                 iotable_init(exynos5_iodesc, ARRAY_SIZE(exynos5_iodesc));
 144 }
 145
 146 static void __init exynos_init_io(void)
 147 {
 148         debug_ll_io_init();
 149
 150         of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
 151
 152         /* detect cpu id and rev. */
 153         s5p_init_cpu(S5P_VA_CHIPID);
 154
 155         exynos_map_io();
 156 }
 157
 158 /*
 159  * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
 160  * and suspend.
 161  *
 162  * This is necessary only on Exynos4 SoCs. When system is running
 163  * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
 164  * feature could properly detect global idle state when secondary CPU is
 165  * powered down.
 166  *
 167  * However this should not be set when such system is going into suspend.
 168  */
 169 void exynos_set_delayed_reset_assertion(bool enable)
 170 {
 171         if (of_machine_is_compatible("samsung,exynos4")) {
 172                 unsigned int tmp, core_id;
 173
 174                 for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
 175                         tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
 176                         if (enable)
 177                                 tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
 178                         else
 179                                 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
 180                         pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
 181                 }
 182         }
 183 }
 184
 185 /*
 186  * Apparently, these SoCs are not able to wake-up from suspend using
 187  * the PMU. Too bad. Should they suddenly become capable of such a
 188  * feat, the matches below should be moved to suspend.c.
 189  */
 190 static const struct of_device_id exynos_dt_pmu_match[] = {
 191         { .compatible = "samsung,exynos5260-pmu" },
 192         { .compatible = "samsung,exynos5410-pmu" },
 193         { /*sentinel*/ },
 194 };
 195
 196 static void exynos_map_pmu(void)
 197 {
 198         struct device_node *np;
 199
 200         np = of_find_matching_node(NULL, exynos_dt_pmu_match);
 201         if (np)
 202                 pmu_base_addr = of_iomap(np, 0);
 203 }
 204
 205 static void __init exynos_init_irq(void)
 206 {
 207         irqchip_init();
 208         /*
 209          * Since platsmp.c needs pmu base address by the time
 210          * DT is not unflatten so we can't use DT APIs before
 211          * init_irq
 212          */
 213         exynos_map_pmu();
 214 }
 215
 216 static void __init exynos_dt_machine_init(void)
 217 {
 218         /*
 219          * This is called from smp_prepare_cpus if we've built for SMP, but
 220          * we still need to set it up for PM and firmware ops if not.
 221          */
 222         if (!IS_ENABLED(CONFIG_SMP))
 223                 exynos_sysram_init();
 224
 225 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
 226         if (of_machine_is_compatible("samsung,exynos4210") ||
 227             of_machine_is_compatible("samsung,exynos3250"))
 228                 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
 229 #endif
 230         if (of_machine_is_compatible("samsung,exynos4210") ||
 231             of_machine_is_compatible("samsung,exynos4212") ||
 232             (of_machine_is_compatible("samsung,exynos4412") &&
 233              of_machine_is_compatible("samsung,trats2")) ||
 234             of_machine_is_compatible("samsung,exynos3250") ||
 235             of_machine_is_compatible("samsung,exynos5250"))
 236                 platform_device_register(&exynos_cpuidle);
 237
 238         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 239 }
 240
 241 static char const *const exynos_dt_compat[] __initconst = {
 242         "samsung,exynos3",
 243         "samsung,exynos3250",
 244         "samsung,exynos4",
 245         "samsung,exynos4210",
 246         "samsung,exynos4212",
 247         "samsung,exynos4412",
 248         "samsung,exynos4415",
 249         "samsung,exynos5",
 250         "samsung,exynos5250",
 251         "samsung,exynos5260",
 252         "samsung,exynos5420",
 253         "samsung,exynos5440",
 254         NULL
 255 };
 256
 257 static void __init exynos_reserve(void)
 258 {
 259 #ifdef CONFIG_S5P_DEV_MFC
 260         int i;
 261         char *mfc_mem[] = {
 262                 "samsung,mfc-v5",
 263                 "samsung,mfc-v6",
 264                 "samsung,mfc-v7",
 265                 "samsung,mfc-v8",
 266         };
 267
 268         for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 269                 if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 270                         break;
 271 #endif
 272 }
 273
 274 static void __init exynos_dt_fixup(void)
 275 {
 276         /*
 277          * Some versions of uboot pass garbage entries in the memory node,
 278          * use the old CONFIG_ARM_NR_BANKS
 279          */
 280         of_fdt_limit_memory(8);
 281 }
 282
 283 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
 284         /* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
 285         /* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 286         .l2c_aux_val    = 0x3c400001,
 287         .l2c_aux_mask   = 0xc20fffff,
 288         .smp            = smp_ops(exynos_smp_ops),
 289         .map_io         = exynos_init_io,
 290         .init_early     = exynos_firmware_init,
 291         .init_irq       = exynos_init_irq,
 292         .init_machine   = exynos_dt_machine_init,
 293         .init_late      = exynos_init_late,
 294         .dt_compat      = exynos_dt_compat,
 295         .reserve        = exynos_reserve,
 296         .dt_fixup       = exynos_dt_fixup,
 297 MACHINE_END