diff options
Diffstat (limited to 'arch/arm/mach-exynos/exynos.c')
| -rw-r--r-- | arch/arm/mach-exynos/exynos.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/exynos.c b/arch/arm/mach-exynos/exynos.c new file mode 100644 index 0000000000..2e8099479f --- /dev/null +++ b/arch/arm/mach-exynos/exynos.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Samsung Exynos Flattened Device Tree enabled machine +// +// Copyright (c) 2010-2014 Samsung Electronics Co., Ltd. +// http://www.samsung.com + +#include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_fdt.h> +#include <linux/platform_device.h> +#include <linux/irqchip.h> +#include <linux/soc/samsung/exynos-regs-pmu.h> + +#include <asm/cacheflush.h> +#include <asm/hardware/cache-l2x0.h> +#include <asm/mach/arch.h> +#include <asm/mach/map.h> + +#include "common.h" + +#define S3C_ADDR_BASE 0xF6000000 +#define S3C_ADDR(x) ((void __iomem __force *)S3C_ADDR_BASE + (x)) +#define S5P_VA_CHIPID S3C_ADDR(0x02000000) + +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; +phys_addr_t sysram_base_phys __ro_after_init; +void __iomem *sysram_ns_base_addr __ro_after_init; + +unsigned long exynos_cpu_id; +static unsigned int exynos_cpu_rev; + +unsigned int exynos_rev(void) +{ + return exynos_cpu_rev; +} + +void __init exynos_sysram_init(void) +{ + struct device_node *node; + + for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") { + struct resource res; + if (!of_device_is_available(node)) + continue; + + of_address_to_resource(node, 0, &res); + sysram_base_addr = ioremap(res.start, resource_size(&res)); + sysram_base_phys = res.start; + of_node_put(node); + 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); + of_node_put(node); + break; + } +} + +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")) + 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; +} + +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. */ + exynos_cpu_id = readl_relaxed(S5P_VA_CHIPID); + exynos_cpu_rev = exynos_cpu_id & 0xFF; + + pr_info("Samsung CPU ID: 0x%08lx\n", exynos_cpu_id); + +} + +/* + * 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); + of_node_put(np); +} + +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,exynos4212") || + (of_machine_is_compatible("samsung,exynos4412") && + (of_machine_is_compatible("samsung,trats2") || + of_machine_is_compatible("samsung,midas") || + of_machine_is_compatible("samsung,p4note"))) || + 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,exynos4212", + "samsung,exynos4412", + "samsung,exynos5", + "samsung,exynos5250", + "samsung,exynos5260", + "samsung,exynos5420", + 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)") + .l2c_aux_val = 0x08400000, + .l2c_aux_mask = 0xf60fffff, + .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_pm_init, + .dt_compat = exynos_dt_compat, + .dt_fixup = exynos_dt_fixup, +MACHINE_END |