arch/arm/mach-exynos/exynos.c - kernel/bruno - Git at Google

 /*
  * 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 <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/serial_s3c.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_fdt.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_domain.h>
 #include <linux/irqchip.h>

 #include <asm/cacheflush.h>
 #include <asm/hardware/cache-l2x0.h>
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/memory.h>

 #include <mach/map.h>

 #include "common.h"
 #include "mfc.h"
 #include "regs-pmu.h"

 void __iomem *pmu_base_addr;

 static struct map_desc exynos4_iodesc[] __initdata = {
 	{
 		.virtual	= (unsigned long)S5P_VA_SROMC,
 		.pfn		= __phys_to_pfn(EXYNOS4_PA_SROMC),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5P_VA_CMU,
 		.pfn		= __phys_to_pfn(EXYNOS4_PA_CMU),
 		.length		= SZ_128K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5P_VA_COREPERI_BASE,
 		.pfn		= __phys_to_pfn(EXYNOS4_PA_COREPERI),
 		.length		= SZ_8K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5P_VA_DMC0,
 		.pfn		= __phys_to_pfn(EXYNOS4_PA_DMC0),
 		.length		= SZ_64K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5P_VA_DMC1,
 		.pfn		= __phys_to_pfn(EXYNOS4_PA_DMC1),
 		.length		= SZ_64K,
 		.type		= MT_DEVICE,
 	},
 };

 static struct map_desc exynos5_iodesc[] __initdata = {
 	{
 		.virtual	= (unsigned long)S5P_VA_SROMC,
 		.pfn		= __phys_to_pfn(EXYNOS5_PA_SROMC),
 		.length		= SZ_4K,
 		.type		= MT_DEVICE,
 	}, {
 		.virtual	= (unsigned long)S5P_VA_CMU,
 		.pfn		= __phys_to_pfn(EXYNOS5_PA_CMU),
 		.length		= 144 * SZ_1K,
 		.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;
 void __iomem *sysram_ns_base_addr;

 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));

 	if (soc_is_exynos5())
 		iotable_init(exynos5_iodesc, ARRAY_SIZE(exynos5_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 const struct of_device_id exynos_cpufreq_matches[] = {
 	{ .compatible = "samsung,exynos3250", .data = "cpufreq-dt" },
 	{ .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
 	{ .compatible = "samsung,exynos4212", .data = "cpufreq-dt" },
 	{ .compatible = "samsung,exynos4412", .data = "cpufreq-dt" },
 	{ .compatible = "samsung,exynos5250", .data = "cpufreq-dt" },
 	{ /* sentinel */ }
 };

 static void __init exynos_cpufreq_init(void)
 {
 	struct device_node *root = of_find_node_by_path("/");
 	const struct of_device_id *match;

 	match = of_match_node(exynos_cpufreq_matches, root);
 	if (!match) {
 		platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
 		return;
 	}

 	platform_device_register_simple(match->data, -1, NULL, 0);
 }

 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,exynos3250") ||
 	    of_machine_is_compatible("samsung,exynos5250"))
 		platform_device_register(&exynos_cpuidle);

 	exynos_cpufreq_init();

 	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 }

 static char const *const exynos_dt_compat[] __initconst = {
 	"samsung,exynos3",
 	"samsung,exynos3250",
 	"samsung,exynos4",
 	"samsung,exynos4210",
 	"samsung,exynos4212",
 	"samsung,exynos4412",
 	"samsung,exynos4415",
 	"samsung,exynos5",
 	"samsung,exynos5250",
 	"samsung,exynos5260",
 	"samsung,exynos5420",
 	"samsung,exynos5440",
 	NULL
 };

 static void __init exynos_reserve(void)
 {
 #ifdef CONFIG_S5P_DEV_MFC
 	int i;
 	char *mfc_mem[] = {
 		"samsung,mfc-v5",
 		"samsung,mfc-v6",
 		"samsung,mfc-v7",
 		"samsung,mfc-v8",
 	};

 	for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
 		if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
 			break;
 #endif
 }

 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 <thomas.abraham@linaro.org> */
 	/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
 	.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,
 	.reserve	= exynos_reserve,
 	.dt_fixup	= exynos_dt_fixup,
 MACHINE_END
	/*
	* 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 <linux/init.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/serial_s3c.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_fdt.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/pm_domain.h>
	#include <linux/irqchip.h>

	#include <asm/cacheflush.h>
	#include <asm/hardware/cache-l2x0.h>
	#include <asm/mach/arch.h>
	#include <asm/mach/map.h>
	#include <asm/memory.h>

	#include <mach/map.h>

	#include "common.h"
	#include "mfc.h"
	#include "regs-pmu.h"

	void __iomem *pmu_base_addr;

	static struct map_desc exynos4_iodesc[] __initdata = {
	{
	.virtual = (unsigned long)S5P_VA_SROMC,
	.pfn = __phys_to_pfn(EXYNOS4_PA_SROMC),
	.length = SZ_4K,
	.type = MT_DEVICE,
	}, {
	.virtual = (unsigned long)S5P_VA_CMU,
	.pfn = __phys_to_pfn(EXYNOS4_PA_CMU),
	.length = SZ_128K,
	.type = MT_DEVICE,
	}, {
	.virtual = (unsigned long)S5P_VA_COREPERI_BASE,
	.pfn = __phys_to_pfn(EXYNOS4_PA_COREPERI),
	.length = SZ_8K,
	.type = MT_DEVICE,
	}, {
	.virtual = (unsigned long)S5P_VA_DMC0,
	.pfn = __phys_to_pfn(EXYNOS4_PA_DMC0),
	.length = SZ_64K,
	.type = MT_DEVICE,
	}, {
	.virtual = (unsigned long)S5P_VA_DMC1,
	.pfn = __phys_to_pfn(EXYNOS4_PA_DMC1),
	.length = SZ_64K,
	.type = MT_DEVICE,
	},
	};

	static struct map_desc exynos5_iodesc[] __initdata = {
	{
	.virtual = (unsigned long)S5P_VA_SROMC,
	.pfn = __phys_to_pfn(EXYNOS5_PA_SROMC),
	.length = SZ_4K,
	.type = MT_DEVICE,
	}, {
	.virtual = (unsigned long)S5P_VA_CMU,
	.pfn = __phys_to_pfn(EXYNOS5_PA_CMU),
	.length = 144 * SZ_1K,
	.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;
	void __iomem *sysram_ns_base_addr;

	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));

	if (soc_is_exynos5())
	iotable_init(exynos5_iodesc, ARRAY_SIZE(exynos5_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 const struct of_device_id exynos_cpufreq_matches[] = {
	{ .compatible = "samsung,exynos3250", .data = "cpufreq-dt" },
	{ .compatible = "samsung,exynos4210", .data = "cpufreq-dt" },
	{ .compatible = "samsung,exynos4212", .data = "cpufreq-dt" },
	{ .compatible = "samsung,exynos4412", .data = "cpufreq-dt" },
	{ .compatible = "samsung,exynos5250", .data = "cpufreq-dt" },
	{ /* sentinel */ }
	};

	static void __init exynos_cpufreq_init(void)
	{
	struct device_node *root = of_find_node_by_path("/");
	const struct of_device_id *match;

	match = of_match_node(exynos_cpufreq_matches, root);
	if (!match) {
	platform_device_register_simple("exynos-cpufreq", -1, NULL, 0);
	return;
	}

	platform_device_register_simple(match->data, -1, NULL, 0);
	}

	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,exynos3250") \|\|
	of_machine_is_compatible("samsung,exynos5250"))
	platform_device_register(&exynos_cpuidle);

	exynos_cpufreq_init();

	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
	}

	static char const *const exynos_dt_compat[] __initconst = {
	"samsung,exynos3",
	"samsung,exynos3250",
	"samsung,exynos4",
	"samsung,exynos4210",
	"samsung,exynos4212",
	"samsung,exynos4412",
	"samsung,exynos4415",
	"samsung,exynos5",
	"samsung,exynos5250",
	"samsung,exynos5260",
	"samsung,exynos5420",
	"samsung,exynos5440",
	NULL
	};

	static void __init exynos_reserve(void)
	{
	#ifdef CONFIG_S5P_DEV_MFC
	int i;
	char *mfc_mem[] = {
	"samsung,mfc-v5",
	"samsung,mfc-v6",
	"samsung,mfc-v7",
	"samsung,mfc-v8",
	};

	for (i = 0; i < ARRAY_SIZE(mfc_mem); i++)
	if (of_scan_flat_dt(s5p_fdt_alloc_mfc_mem, mfc_mem[i]))
	break;
	#endif
	}

	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 <thomas.abraham@linaro.org> */
	/* Maintainer: Kukjin Kim <kgene.kim@samsung.com> */
	.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,
	.reserve = exynos_reserve,
	.dt_fixup = exynos_dt_fixup,
	MACHINE_END