1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // SAMSUNG EXYNOS Flattened Device Tree enabled machine 4 // 5 // Copyright (c) 2010-2014 Samsung Electronics Co., Ltd. 6 // http://www.samsung.com 7 8 #include <linux/init.h> 9 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/of_address.h> 12 #include <linux/of_fdt.h> 13 #include <linux/platform_device.h> 14 #include <linux/irqchip.h> 15 #include <linux/soc/samsung/exynos-regs-pmu.h> 16 17 #include <asm/cacheflush.h> 18 #include <asm/hardware/cache-l2x0.h> 19 #include <asm/mach/arch.h> 20 #include <asm/mach/map.h> 21 22 #include <mach/map.h> 23 #include <plat/cpu.h> 24 25 #include "common.h" 26 27 static struct platform_device exynos_cpuidle = { 28 .name = "exynos_cpuidle", 29 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE 30 .dev.platform_data = exynos_enter_aftr, 31 #endif 32 .id = -1, 33 }; 34 35 void __iomem *sysram_base_addr __ro_after_init; 36 void __iomem *sysram_ns_base_addr __ro_after_init; 37 38 void __init exynos_sysram_init(void) 39 { 40 struct device_node *node; 41 42 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { 43 if (!of_device_is_available(node)) 44 continue; 45 sysram_base_addr = of_iomap(node, 0); 46 break; 47 } 48 49 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") { 50 if (!of_device_is_available(node)) 51 continue; 52 sysram_ns_base_addr = of_iomap(node, 0); 53 break; 54 } 55 } 56 57 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname, 58 int depth, void *data) 59 { 60 struct map_desc iodesc; 61 const __be32 *reg; 62 int len; 63 64 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid")) 65 return 0; 66 67 reg = of_get_flat_dt_prop(node, "reg", &len); 68 if (reg == NULL || len != (sizeof(unsigned long) * 2)) 69 return 0; 70 71 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0])); 72 iodesc.length = be32_to_cpu(reg[1]) - 1; 73 iodesc.virtual = (unsigned long)S5P_VA_CHIPID; 74 iodesc.type = MT_DEVICE; 75 iotable_init(&iodesc, 1); 76 return 1; 77 } 78 79 static void __init exynos_init_io(void) 80 { 81 debug_ll_io_init(); 82 83 of_scan_flat_dt(exynos_fdt_map_chipid, NULL); 84 85 /* detect cpu id and rev. */ 86 s5p_init_cpu(S5P_VA_CHIPID); 87 } 88 89 /* 90 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code 91 * and suspend. 92 * 93 * This is necessary only on Exynos4 SoCs. When system is running 94 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down 95 * feature could properly detect global idle state when secondary CPU is 96 * powered down. 97 * 98 * However this should not be set when such system is going into suspend. 99 */ 100 void exynos_set_delayed_reset_assertion(bool enable) 101 { 102 if (of_machine_is_compatible("samsung,exynos4")) { 103 unsigned int tmp, core_id; 104 105 for (core_id = 0; core_id < num_possible_cpus(); core_id++) { 106 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); 107 if (enable) 108 tmp |= S5P_USE_DELAYED_RESET_ASSERTION; 109 else 110 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); 111 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); 112 } 113 } 114 } 115 116 /* 117 * Apparently, these SoCs are not able to wake-up from suspend using 118 * the PMU. Too bad. Should they suddenly become capable of such a 119 * feat, the matches below should be moved to suspend.c. 120 */ 121 static const struct of_device_id exynos_dt_pmu_match[] = { 122 { .compatible = "samsung,exynos5260-pmu" }, 123 { .compatible = "samsung,exynos5410-pmu" }, 124 { /*sentinel*/ }, 125 }; 126 127 static void exynos_map_pmu(void) 128 { 129 struct device_node *np; 130 131 np = of_find_matching_node(NULL, exynos_dt_pmu_match); 132 if (np) 133 pmu_base_addr = of_iomap(np, 0); 134 } 135 136 static void __init exynos_init_irq(void) 137 { 138 irqchip_init(); 139 /* 140 * Since platsmp.c needs pmu base address by the time 141 * DT is not unflatten so we can't use DT APIs before 142 * init_irq 143 */ 144 exynos_map_pmu(); 145 } 146 147 static void __init exynos_dt_machine_init(void) 148 { 149 /* 150 * This is called from smp_prepare_cpus if we've built for SMP, but 151 * we still need to set it up for PM and firmware ops if not. 152 */ 153 if (!IS_ENABLED(CONFIG_SMP)) 154 exynos_sysram_init(); 155 156 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE) 157 if (of_machine_is_compatible("samsung,exynos4210") || 158 of_machine_is_compatible("samsung,exynos3250")) 159 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data; 160 #endif 161 if (of_machine_is_compatible("samsung,exynos4210") || 162 (of_machine_is_compatible("samsung,exynos4412") && 163 (of_machine_is_compatible("samsung,trats2") || 164 of_machine_is_compatible("samsung,midas"))) || 165 of_machine_is_compatible("samsung,exynos3250") || 166 of_machine_is_compatible("samsung,exynos5250")) 167 platform_device_register(&exynos_cpuidle); 168 } 169 170 static char const *const exynos_dt_compat[] __initconst = { 171 "samsung,exynos3", 172 "samsung,exynos3250", 173 "samsung,exynos4", 174 "samsung,exynos4210", 175 "samsung,exynos4412", 176 "samsung,exynos5", 177 "samsung,exynos5250", 178 "samsung,exynos5260", 179 "samsung,exynos5420", 180 NULL 181 }; 182 183 static void __init exynos_dt_fixup(void) 184 { 185 /* 186 * Some versions of uboot pass garbage entries in the memory node, 187 * use the old CONFIG_ARM_NR_BANKS 188 */ 189 of_fdt_limit_memory(8); 190 } 191 192 DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)") 193 .l2c_aux_val = 0x3c400001, 194 .l2c_aux_mask = 0xc20fffff, 195 .smp = smp_ops(exynos_smp_ops), 196 .map_io = exynos_init_io, 197 .init_early = exynos_firmware_init, 198 .init_irq = exynos_init_irq, 199 .init_machine = exynos_dt_machine_init, 200 .init_late = exynos_pm_init, 201 .dt_compat = exynos_dt_compat, 202 .dt_fixup = exynos_dt_fixup, 203 MACHINE_END 204