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