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 "common.h" 23 24 #define S3C_ADDR_BASE 0xF6000000 25 #define S3C_ADDR(x) ((void __iomem __force *)S3C_ADDR_BASE + (x)) 26 #define S5P_VA_CHIPID S3C_ADDR(0x02000000) 27 28 static struct platform_device exynos_cpuidle = { 29 .name = "exynos_cpuidle", 30 #ifdef CONFIG_ARM_EXYNOS_CPUIDLE 31 .dev.platform_data = exynos_enter_aftr, 32 #endif 33 .id = -1, 34 }; 35 36 void __iomem *sysram_base_addr __ro_after_init; 37 phys_addr_t sysram_base_phys __ro_after_init; 38 void __iomem *sysram_ns_base_addr __ro_after_init; 39 40 unsigned long exynos_cpu_id; 41 static unsigned int exynos_cpu_rev; 42 43 unsigned int exynos_rev(void) 44 { 45 return exynos_cpu_rev; 46 } 47 48 void __init exynos_sysram_init(void) 49 { 50 struct device_node *node; 51 52 for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { 53 if (!of_device_is_available(node)) 54 continue; 55 sysram_base_addr = of_iomap(node, 0); 56 sysram_base_phys = of_translate_address(node, 57 of_get_address(node, 0, NULL, NULL)); 58 of_node_put(node); 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 of_node_put(node); 67 break; 68 } 69 } 70 71 static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname, 72 int depth, void *data) 73 { 74 struct map_desc iodesc; 75 const __be32 *reg; 76 int len; 77 78 if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid")) 79 return 0; 80 81 reg = of_get_flat_dt_prop(node, "reg", &len); 82 if (reg == NULL || len != (sizeof(unsigned long) * 2)) 83 return 0; 84 85 iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0])); 86 iodesc.length = be32_to_cpu(reg[1]) - 1; 87 iodesc.virtual = (unsigned long)S5P_VA_CHIPID; 88 iodesc.type = MT_DEVICE; 89 iotable_init(&iodesc, 1); 90 return 1; 91 } 92 93 static void __init exynos_init_io(void) 94 { 95 debug_ll_io_init(); 96 97 of_scan_flat_dt(exynos_fdt_map_chipid, NULL); 98 99 /* detect cpu id and rev. */ 100 exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID); 101 exynos_cpu_rev = exynos_cpu_id & 0xFF; 102 103 pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id); 104 105 } 106 107 /* 108 * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code 109 * and suspend. 110 * 111 * This is necessary only on Exynos4 SoCs. When system is running 112 * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down 113 * feature could properly detect global idle state when secondary CPU is 114 * powered down. 115 * 116 * However this should not be set when such system is going into suspend. 117 */ 118 void exynos_set_delayed_reset_assertion(bool enable) 119 { 120 if (of_machine_is_compatible("samsung,exynos4")) { 121 unsigned int tmp, core_id; 122 123 for (core_id = 0; core_id < num_possible_cpus(); core_id++) { 124 tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); 125 if (enable) 126 tmp |= S5P_USE_DELAYED_RESET_ASSERTION; 127 else 128 tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); 129 pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); 130 } 131 } 132 } 133 134 /* 135 * Apparently, these SoCs are not able to wake-up from suspend using 136 * the PMU. Too bad. Should they suddenly become capable of such a 137 * feat, the matches below should be moved to suspend.c. 138 */ 139 static const struct of_device_id exynos_dt_pmu_match[] = { 140 { .compatible = "samsung,exynos5260-pmu" }, 141 { .compatible = "samsung,exynos5410-pmu" }, 142 { /*sentinel*/ }, 143 }; 144 145 static void exynos_map_pmu(void) 146 { 147 struct device_node *np; 148 149 np = of_find_matching_node(NULL, exynos_dt_pmu_match); 150 if (np) 151 pmu_base_addr = of_iomap(np, 0); 152 } 153 154 static void __init exynos_init_irq(void) 155 { 156 irqchip_init(); 157 /* 158 * Since platsmp.c needs pmu base address by the time 159 * DT is not unflatten so we can't use DT APIs before 160 * init_irq 161 */ 162 exynos_map_pmu(); 163 } 164 165 static void __init exynos_dt_machine_init(void) 166 { 167 /* 168 * This is called from smp_prepare_cpus if we've built for SMP, but 169 * we still need to set it up for PM and firmware ops if not. 170 */ 171 if (!IS_ENABLED(CONFIG_SMP)) 172 exynos_sysram_init(); 173 174 #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE) 175 if (of_machine_is_compatible("samsung,exynos4210") || 176 of_machine_is_compatible("samsung,exynos3250")) 177 exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data; 178 #endif 179 if (of_machine_is_compatible("samsung,exynos4210") || 180 (of_machine_is_compatible("samsung,exynos4412") && 181 (of_machine_is_compatible("samsung,trats2") || 182 of_machine_is_compatible("samsung,midas") || 183 of_machine_is_compatible("samsung,p4note"))) || 184 of_machine_is_compatible("samsung,exynos3250") || 185 of_machine_is_compatible("samsung,exynos5250")) 186 platform_device_register(&exynos_cpuidle); 187 } 188 189 static char const *const exynos_dt_compat[] __initconst = { 190 "samsung,exynos3", 191 "samsung,exynos3250", 192 "samsung,exynos4", 193 "samsung,exynos4210", 194 "samsung,exynos4412", 195 "samsung,exynos5", 196 "samsung,exynos5250", 197 "samsung,exynos5260", 198 "samsung,exynos5420", 199 NULL 200 }; 201 202 static void __init exynos_dt_fixup(void) 203 { 204 /* 205 * Some versions of uboot pass garbage entries in the memory node, 206 * use the old CONFIG_ARM_NR_BANKS 207 */ 208 of_fdt_limit_memory(8); 209 } 210 211 DT_MACHINE_START(EXYNOS_DT, "Samsung Exynos (Flattened Device Tree)") 212 .l2c_aux_val = 0x08400000, 213 .l2c_aux_mask = 0xf60fffff, 214 .smp = smp_ops(exynos_smp_ops), 215 .map_io = exynos_init_io, 216 .init_early = exynos_firmware_init, 217 .init_irq = exynos_init_irq, 218 .init_machine = exynos_dt_machine_init, 219 .init_late = exynos_pm_init, 220 .dt_compat = exynos_dt_compat, 221 .dt_fixup = exynos_dt_fixup, 222 MACHINE_END 223