242 lines
6.1 KiB
C
242 lines
6.1 KiB
C
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/*
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* SAMSUNG EXYNOS Flattened Device Tree enabled machine
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*
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* Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_fdt.h>
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#include <linux/platform_device.h>
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#include <linux/irqchip.h>
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#include <linux/soc/samsung/exynos-regs-pmu.h>
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#include <asm/cacheflush.h>
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#include <asm/hardware/cache-l2x0.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <mach/map.h>
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#include <plat/cpu.h>
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#include "common.h"
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static struct map_desc exynos4_iodesc[] __initdata = {
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{
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.virtual = (unsigned long)S5P_VA_COREPERI_BASE,
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.pfn = __phys_to_pfn(EXYNOS4_PA_COREPERI),
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.length = SZ_8K,
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.type = MT_DEVICE,
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},
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};
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static struct platform_device exynos_cpuidle = {
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.name = "exynos_cpuidle",
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#ifdef CONFIG_ARM_EXYNOS_CPUIDLE
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.dev.platform_data = exynos_enter_aftr,
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#endif
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.id = -1,
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};
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void __iomem *sysram_base_addr __ro_after_init;
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void __iomem *sysram_ns_base_addr __ro_after_init;
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void __init exynos_sysram_init(void)
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{
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struct device_node *node;
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for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram") {
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if (!of_device_is_available(node))
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continue;
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sysram_base_addr = of_iomap(node, 0);
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break;
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}
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for_each_compatible_node(node, NULL, "samsung,exynos4210-sysram-ns") {
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if (!of_device_is_available(node))
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continue;
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sysram_ns_base_addr = of_iomap(node, 0);
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break;
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}
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}
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static void __init exynos_init_late(void)
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{
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if (of_machine_is_compatible("samsung,exynos5440"))
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/* to be supported later */
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return;
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exynos_pm_init();
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}
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static int __init exynos_fdt_map_chipid(unsigned long node, const char *uname,
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int depth, void *data)
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{
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struct map_desc iodesc;
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const __be32 *reg;
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int len;
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if (!of_flat_dt_is_compatible(node, "samsung,exynos4210-chipid") &&
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!of_flat_dt_is_compatible(node, "samsung,exynos5440-clock"))
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return 0;
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reg = of_get_flat_dt_prop(node, "reg", &len);
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if (reg == NULL || len != (sizeof(unsigned long) * 2))
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return 0;
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iodesc.pfn = __phys_to_pfn(be32_to_cpu(reg[0]));
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iodesc.length = be32_to_cpu(reg[1]) - 1;
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iodesc.virtual = (unsigned long)S5P_VA_CHIPID;
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iodesc.type = MT_DEVICE;
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iotable_init(&iodesc, 1);
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return 1;
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}
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/*
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* exynos_map_io
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*
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* register the standard cpu IO areas
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*/
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static void __init exynos_map_io(void)
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{
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if (soc_is_exynos4())
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iotable_init(exynos4_iodesc, ARRAY_SIZE(exynos4_iodesc));
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}
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static void __init exynos_init_io(void)
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{
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debug_ll_io_init();
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of_scan_flat_dt(exynos_fdt_map_chipid, NULL);
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/* detect cpu id and rev. */
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s5p_init_cpu(S5P_VA_CHIPID);
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exynos_map_io();
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}
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/*
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* Set or clear the USE_DELAYED_RESET_ASSERTION option. Used by smp code
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* and suspend.
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*
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* This is necessary only on Exynos4 SoCs. When system is running
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* USE_DELAYED_RESET_ASSERTION should be set so the ARM CLK clock down
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* feature could properly detect global idle state when secondary CPU is
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* powered down.
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*
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* However this should not be set when such system is going into suspend.
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*/
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void exynos_set_delayed_reset_assertion(bool enable)
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{
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if (of_machine_is_compatible("samsung,exynos4")) {
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unsigned int tmp, core_id;
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for (core_id = 0; core_id < num_possible_cpus(); core_id++) {
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tmp = pmu_raw_readl(EXYNOS_ARM_CORE_OPTION(core_id));
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if (enable)
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tmp |= S5P_USE_DELAYED_RESET_ASSERTION;
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else
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tmp &= ~(S5P_USE_DELAYED_RESET_ASSERTION);
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pmu_raw_writel(tmp, EXYNOS_ARM_CORE_OPTION(core_id));
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}
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}
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}
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/*
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* Apparently, these SoCs are not able to wake-up from suspend using
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* the PMU. Too bad. Should they suddenly become capable of such a
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* feat, the matches below should be moved to suspend.c.
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*/
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static const struct of_device_id exynos_dt_pmu_match[] = {
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{ .compatible = "samsung,exynos5260-pmu" },
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{ .compatible = "samsung,exynos5410-pmu" },
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{ /*sentinel*/ },
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};
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static void exynos_map_pmu(void)
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{
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struct device_node *np;
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np = of_find_matching_node(NULL, exynos_dt_pmu_match);
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if (np)
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pmu_base_addr = of_iomap(np, 0);
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}
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static void __init exynos_init_irq(void)
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{
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irqchip_init();
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/*
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* Since platsmp.c needs pmu base address by the time
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* DT is not unflatten so we can't use DT APIs before
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* init_irq
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*/
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exynos_map_pmu();
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}
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static void __init exynos_dt_machine_init(void)
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{
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/*
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* This is called from smp_prepare_cpus if we've built for SMP, but
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* we still need to set it up for PM and firmware ops if not.
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*/
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if (!IS_ENABLED(CONFIG_SMP))
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exynos_sysram_init();
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#if defined(CONFIG_SMP) && defined(CONFIG_ARM_EXYNOS_CPUIDLE)
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if (of_machine_is_compatible("samsung,exynos4210") ||
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of_machine_is_compatible("samsung,exynos3250"))
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exynos_cpuidle.dev.platform_data = &cpuidle_coupled_exynos_data;
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#endif
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if (of_machine_is_compatible("samsung,exynos4210") ||
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(of_machine_is_compatible("samsung,exynos4412") &&
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of_machine_is_compatible("samsung,trats2")) ||
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of_machine_is_compatible("samsung,exynos3250") ||
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of_machine_is_compatible("samsung,exynos5250"))
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platform_device_register(&exynos_cpuidle);
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}
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static char const *const exynos_dt_compat[] __initconst = {
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"samsung,exynos3",
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"samsung,exynos3250",
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"samsung,exynos4",
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"samsung,exynos4210",
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"samsung,exynos4412",
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"samsung,exynos5",
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"samsung,exynos5250",
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"samsung,exynos5260",
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"samsung,exynos5420",
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"samsung,exynos5440",
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NULL
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};
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static void __init exynos_dt_fixup(void)
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{
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/*
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* Some versions of uboot pass garbage entries in the memory node,
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* use the old CONFIG_ARM_NR_BANKS
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*/
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of_fdt_limit_memory(8);
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}
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DT_MACHINE_START(EXYNOS_DT, "SAMSUNG EXYNOS (Flattened Device Tree)")
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/* Maintainer: Thomas Abraham <thomas.abraham@linaro.org> */
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/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
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.l2c_aux_val = 0x3c400001,
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.l2c_aux_mask = 0xc20fffff,
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.smp = smp_ops(exynos_smp_ops),
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.map_io = exynos_init_io,
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.init_early = exynos_firmware_init,
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.init_irq = exynos_init_irq,
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.init_machine = exynos_dt_machine_init,
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.init_late = exynos_init_late,
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.dt_compat = exynos_dt_compat,
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.dt_fixup = exynos_dt_fixup,
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MACHINE_END
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