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 260