/* * SAMSUNG EXYNOS Flattened Device Tree enabled machine * * Copyright (c) 2010-2014 Samsung Electronics Co., Ltd. * http://www.samsung.com * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "common.h" static struct map_desc exynos4_iodesc[] __initdata = { { .virtual = (unsigned long)S5P_VA_COREPERI_BASE, .pfn = __phys_to_pfn(EXYNOS4_PA_COREPERI), .length = SZ_8K, .type = MT_DEVICE, }, }; static struct platform_device exynos_cpuidle = { .name = "exynos_cpuidle", #ifdef CONFIG_ARM_EXYNOS_CPUIDLE .dev.platform_data = exynos_enter_aftr, #endif .id = -1, }; void __iomem *sysram_base_addr __ro_after_init; void __iomem *sysram_ns_base_addr __ro_after_init; void __init exynos_sysram_init(void) { struct device_node *node; for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { if (!of_device_is_available(node)) continue; sysram_base_addr = of_iomap(node, 0); break; } for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") { if (!of_device_is_available(node)) continue; sysram_ns_base_addr = of_iomap(node, 0); break; } } static void __init exynos_init_late(void) { if (of_machine_is_compatible("samsung,exynos5440")) /* to be supported later */ return; exynos_pm_init(); } static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname, int depth, void *data) { struct map_desc iodesc; const __be32 *reg; int len; if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") && !of_flat_dt_is_compatible(node, "samsung,exynos5440-clock")) return 0; reg = of_get_flat_dt_prop(node, "reg", &len); if (reg == NULL || len != (sizeof(unsigned long) * 2)) return 0; iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0])); iodesc.length = be32_to_cpu(reg[1]) - 1; iodesc.virtual = (unsigned long)S5P_VA_CHIPID; iodesc.type = MT_DEVICE; iotable_init(&iodesc, 1); return 1; } /* * exynos_map_io * * register the standard cpu IO areas */ static void __init exynos_map_io(void) { if (soc_is_exynos4()) iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc)); } static void __init exynos_init_io(void) { debug_ll_io_init(); of_scan_flat_dt(exynos_fdt_map_chipid, NULL); /* detect cpu id and rev. */ s5p_init_cpu(S5P_VA_CHIPID); exynos_map_io(); } /* * Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code * and suspend. * * This is necessary only on Exynos4 SoCs. When system is running * USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down * feature could properly detect global idle state when secondary CPU is * powered down. * * However this should not be set when such system is going into suspend. */ void exynos_set_delayed_reset_assertion(bool enable) { if (of_machine_is_compatible("samsung,exynos4")) { unsigned int tmp, core_id; for (core_id = 0; core_id < num_possible_cpus(); core_id++) { tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id)); if (enable) tmp |= S5P_USE_DELAYED_RESET_ASSERTION; else tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION); pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id)); } } } /* * Apparently, these SoCs are not able to wake-up from suspend using * the PMU. Too bad. Should they suddenly become capable of such a * feat, the matches below should be moved to suspend.c. */ static const struct of_device_id exynos_dt_pmu_match[] = { { .compatible = "samsung,exynos5260-pmu" }, { .compatible = "samsung,exynos5410-pmu" }, { /*sentinel*/ }, }; static void exynos_map_pmu(void) { struct device_node *np; np = of_find_matching_node(NULL, exynos_dt_pmu_match); if (np) pmu_base_addr = of_iomap(np, 0); } static void __init exynos_init_irq(void) { irqchip_init(); /* * Since platsmp.c needs pmu base address by the time * DT is not unflatten so we can't use DT APIs before * init_irq */ exynos_map_pmu(); } static void __init exynos_dt_machine_init(void) { /* * This is called from smp_prepare_cpus if we've built for SMP, but * we still need to set it up for PM and firmware ops if not. */ if (!IS_ENABLED(CONFIG_SMP)) exynos_sysram_init(); #if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE) if (of_machine_is_compatible("samsung,exynos4210") || of_machine_is_compatible("samsung,exynos3250")) exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data; #endif if (of_machine_is_compatible("samsung,exynos4210") || (of_machine_is_compatible("samsung,exynos4412") && of_machine_is_compatible("samsung,trats2")) || of_machine_is_compatible("samsung,exynos3250") || of_machine_is_compatible("samsung,exynos5250")) platform_device_register(&exynos_cpuidle); } static char const *const exynos_dt_compat[] __initconst = { "samsung,exynos3", "samsung,exynos3250", "samsung,exynos4", "samsung,exynos4210", "samsung,exynos4412", "samsung,exynos5", "samsung,exynos5250", "samsung,exynos5260", "samsung,exynos5420", "samsung,exynos5440", NULL }; static void __init exynos_dt_fixup(void) { /* * Some versions of uboot pass garbage entries in the memory node, * use the old CONFIG_ARM_NR_BANKS */ of_fdt_limit_memory(8); } DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)") /* Maintainer: Thomas Abraham */ /* Maintainer: Kukjin Kim */ .l2c_aux_val = 0x3c400001, .l2c_aux_mask = 0xc20fffff, .smp = smp_ops(exynos_smp_ops), .map_io = exynos_init_io, .init_early = exynos_firmware_init, .init_irq = exynos_init_irq, .init_machine = exynos_dt_machine_init, .init_late = exynos_init_late, .dt_compat = exynos_dt_compat, .dt_fixup = exynos_dt_fixup, MACHINE_END