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