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 phys_addr_t sysram_base_phys __ro_after_init; 37 void __iomem *sysram_ns_base_addr __ro_after_init; 38 39 void __init exynos_sysram_init(void) 40 { 41 struct device_node *node; 42 43 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { 44 if (!of_device_is_available(node)) 45 continue; 46 sysram_base_addr = of_iomap(node, 0); 47 sysram_base_phys = of_translate_address(node, 48 of_get_address(node, 0, NULL, NULL)); 49 break; 50 } 51 52 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") { 53 if (!of_device_is_available(node)) 54 continue; 55 sysram_ns_base_addr = of_iomap(node, 0); 56 break; 57 } 58 } 59 60 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname, 61 int depth, void *data) 62 { 63 struct map_desc iodesc; 64 const __be32 *reg; 65 int len; 66 67 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid")) 68 return 0; 69 70 reg = of_get_flat_dt_prop(node, "reg", &len); 71 if (reg == NULL || len != (sizeof(unsigned long) * 2)) 72 return 0; 73 74 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0])); 75 iodesc.length = be32_to_cpu(reg[1]) - 1; 76 iodesc.virtual = (unsigned long)S5P_VA_CHIPID; 77 iodesc.type = MT_DEVICE; 78 iotable_init(&iodesc, 1); 79 return 1; 80 } 81 82 static void __init exynos_init_io(void) 83 { 84 debug_ll_io_init(); 85 86 of_scan_flat_dt(exynos_fdt_map_chipid, NULL); 87 88 /* detect cpu id and rev. */ 89 s5p_init_cpu(S5P_VA_CHIPID); 90 } 91 92 /* 93 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code 94 * and suspend. 95 * 96 * This is necessary only on Exynos4 SoCs. When system is running 97 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down 98 * feature could properly detect global idle state when secondary CPU is 99 * powered down. 100 * 101 * However this should not be set when such system is going into suspend. 102 */ 103 void exynos_set_delayed_reset_assertion(bool enable) 104 { 105 if (of_machine_is_compatible("samsung,exynos4")) { 106 unsigned int tmp, core_id; 107 108 for (core_id = 0; core_id < num_possible_cpus(); core_id++) { 109 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); 110 if (enable) 111 tmp |= S5P_USE_DELAYED_RESET_ASSERTION; 112 else 113 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); 114 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); 115 } 116 } 117 } 118 119 /* 120 * Apparently, these SoCs are not able to wake-up from suspend using 121 * the PMU. Too bad. Should they suddenly become capable of such a 122 * feat, the matches below should be moved to suspend.c. 123 */ 124 static const struct of_device_id exynos_dt_pmu_match[] = { 125 { .compatible = "samsung,exynos5260-pmu" }, 126 { .compatible = "samsung,exynos5410-pmu" }, 127 { /*sentinel*/ }, 128 }; 129 130 static void exynos_map_pmu(void) 131 { 132 struct device_node *np; 133 134 np = of_find_matching_node(NULL, exynos_dt_pmu_match); 135 if (np) 136 pmu_base_addr = of_iomap(np, 0); 137 } 138 139 static void __init exynos_init_irq(void) 140 { 141 irqchip_init(); 142 /* 143 * Since platsmp.c needs pmu base address by the time 144 * DT is not unflatten so we can't use DT APIs before 145 * init_irq 146 */ 147 exynos_map_pmu(); 148 } 149 150 static void __init exynos_dt_machine_init(void) 151 { 152 /* 153 * This is called from smp_prepare_cpus if we've built for SMP, but 154 * we still need to set it up for PM and firmware ops if not. 155 */ 156 if (!IS_ENABLED(CONFIG_SMP)) 157 exynos_sysram_init(); 158 159 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE) 160 if (of_machine_is_compatible("samsung,exynos4210") || 161 of_machine_is_compatible("samsung,exynos3250")) 162 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data; 163 #endif 164 if (of_machine_is_compatible("samsung,exynos4210") || 165 (of_machine_is_compatible("samsung,exynos4412") && 166 (of_machine_is_compatible("samsung,trats2") || 167 of_machine_is_compatible("samsung,midas"))) || 168 of_machine_is_compatible("samsung,exynos3250") || 169 of_machine_is_compatible("samsung,exynos5250")) 170 platform_device_register(&exynos_cpuidle); 171 } 172 173 static char const *const exynos_dt_compat[] __initconst = { 174 "samsung,exynos3", 175 "samsung,exynos3250", 176 "samsung,exynos4", 177 "samsung,exynos4210", 178 "samsung,exynos4412", 179 "samsung,exynos5", 180 "samsung,exynos5250", 181 "samsung,exynos5260", 182 "samsung,exynos5420", 183 NULL 184 }; 185 186 static void __init exynos_dt_fixup(void) 187 { 188 /* 189 * Some versions of uboot pass garbage entries in the memory node, 190 * use the old CONFIG_ARM_NR_BANKS 191 */ 192 of_fdt_limit_memory(8); 193 } 194 195 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)") 196 .l2c_aux_val = 0x3c400000, 197 .l2c_aux_mask = 0xc20fffff, 198 .smp = smp_ops(exynos_smp_ops), 199 .map_io = exynos_init_io, 200 .init_early = exynos_firmware_init, 201 .init_irq = exynos_init_irq, 202 .init_machine = exynos_dt_machine_init, 203 .init_late = exynos_pm_init, 204 .dt_compat = exynos_dt_compat, 205 .dt_fixup = exynos_dt_fixup, 206 MACHINE_END 207