memory: Add support for Exynos SROM driver (a8aabb91) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/memory/Kconfig

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		@@ -122,6 +122,7 @@ config MTK_SMI
		mainly help enable/disable iommu and control the power domain and
		clocks for each local arbiter.

		source "drivers/memory/samsung/Kconfig"
		source "drivers/memory/tegra/Kconfig"

		endif

drivers/memory/Makefile

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		@@ -17,4 +17,5 @@ obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o
		obj-$(CONFIG_JZ4780_NEMC) += jz4780-nemc.o
		obj-$(CONFIG_MTK_SMI) += mtk-smi.o

		obj-$(CONFIG_SAMSUNG_MC) += samsung/
		obj-$(CONFIG_TEGRA_MC) += tegra/

drivers/memory/samsung/Kconfig

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		config SAMSUNG_MC
		bool "Samsung Exynos Memory Controller support" if COMPILE_TEST
		help
		Support for the Memory Controller (MC) devices found on
		Samsung Exynos SoCs.

		if SAMSUNG_MC

		config EXYNOS_SROM
		bool "Exynos SROM controller driver" if COMPILE_TEST
		depends on (ARM && ARCH_EXYNOS && PM) \|\| (COMPILE_TEST && HAS_IOMEM)

		endif

drivers/memory/samsung/Makefile

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		obj-$(CONFIG_EXYNOS_SROM) += exynos-srom.o

drivers/memory/samsung/exynos-srom.c

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		/*
		* Copyright (c) 2015 Samsung Electronics Co., Ltd.
		* http://www.samsung.com/
		*
		* EXYNOS - SROM Controller support
		* Author: Pankaj Dubey <pankaj.dubey@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/io.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_address.h>
		#include <linux/platform_device.h>
		#include <linux/slab.h>

		#include "exynos-srom.h"

		static const unsigned long exynos_srom_offsets[] = {
		/* SROM side */
		EXYNOS_SROM_BW,
		EXYNOS_SROM_BC0,
		EXYNOS_SROM_BC1,
		EXYNOS_SROM_BC2,
		EXYNOS_SROM_BC3,
		};

		/**
		* struct exynos_srom_reg_dump: register dump of SROM Controller registers.
		* @offset: srom register offset from the controller base address.
		* @value: the value of register under the offset.
		*/
		struct exynos_srom_reg_dump {
		u32 offset;
		u32 value;
		};

		/**
		* struct exynos_srom: platform data for exynos srom controller driver.
		* @dev: platform device pointer
		* @reg_base: srom base address
		* @reg_offset: exynos_srom_reg_dump pointer to hold offset and its value.
		*/
		struct exynos_srom {
		struct device *dev;
		void __iomem *reg_base;
		struct exynos_srom_reg_dump *reg_offset;
		};

		static struct exynos_srom_reg_dump *exynos_srom_alloc_reg_dump(
		const unsigned long *rdump,
		unsigned long nr_rdump)
		{
		struct exynos_srom_reg_dump *rd;
		unsigned int i;

		rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
		if (!rd)
		return NULL;

		for (i = 0; i < nr_rdump; ++i)
		rd[i].offset = rdump[i];

		return rd;
		}

		static int exynos_srom_probe(struct platform_device *pdev)
		{
		struct device_node *np;
		struct exynos_srom *srom;
		struct device *dev = &pdev->dev;

		np = dev->of_node;
		if (!np) {
		dev_err(&pdev->dev, "could not find device info\n");
		return -EINVAL;
		}

		srom = devm_kzalloc(&pdev->dev,
		sizeof(struct exynos_srom), GFP_KERNEL);
		if (!srom)
		return -ENOMEM;

		srom->dev = dev;
		srom->reg_base = of_iomap(np, 0);
		if (!srom->reg_base) {
		dev_err(&pdev->dev, "iomap of exynos srom controller failed\n");
		return -ENOMEM;
		}

		platform_set_drvdata(pdev, srom);

		srom->reg_offset = exynos_srom_alloc_reg_dump(exynos_srom_offsets,
		sizeof(exynos_srom_offsets));
		if (!srom->reg_offset) {
		iounmap(srom->reg_base);
		return -ENOMEM;
		}

		return 0;
		}

		static int exynos_srom_remove(struct platform_device *pdev)
		{
		struct exynos_srom *srom = platform_get_drvdata(pdev);

		kfree(srom->reg_offset);
		iounmap(srom->reg_base);

		return 0;
		}

		#ifdef CONFIG_PM_SLEEP
		static void exynos_srom_save(void __iomem *base,
		struct exynos_srom_reg_dump *rd,
		unsigned int num_regs)
		{
		for (; num_regs > 0; --num_regs, ++rd)
		rd->value = readl(base + rd->offset);
		}

		static void exynos_srom_restore(void __iomem *base,
		const struct exynos_srom_reg_dump *rd,
		unsigned int num_regs)
		{
		for (; num_regs > 0; --num_regs, ++rd)
		writel(rd->value, base + rd->offset);
		}

		static int exynos_srom_suspend(struct device *dev)
		{
		struct exynos_srom *srom = dev_get_drvdata(dev);

		exynos_srom_save(srom->reg_base, srom->reg_offset,
		ARRAY_SIZE(exynos_srom_offsets));
		return 0;
		}

		static int exynos_srom_resume(struct device *dev)
		{
		struct exynos_srom *srom = dev_get_drvdata(dev);

		exynos_srom_restore(srom->reg_base, srom->reg_offset,
		ARRAY_SIZE(exynos_srom_offsets));
		return 0;
		}
		#endif

		static const struct of_device_id of_exynos_srom_ids[] = {
		{
		.compatible = "samsung,exynos4210-srom",
		},
		{},
		};
		MODULE_DEVICE_TABLE(of, of_exynos_srom_ids);

		static SIMPLE_DEV_PM_OPS(exynos_srom_pm_ops, exynos_srom_suspend, exynos_srom_resume);

		static struct platform_driver exynos_srom_driver = {
		.probe = exynos_srom_probe,
		.remove = exynos_srom_remove,
		.driver = {
		.name = "exynos-srom",
		.of_match_table = of_exynos_srom_ids,
		.pm = &exynos_srom_pm_ops,
		},
		};
		module_platform_driver(exynos_srom_driver);

		MODULE_AUTHOR("Pankaj Dubey <pankaj.dubey@samsung.com>");
		MODULE_DESCRIPTION("Exynos SROM Controller Driver");
		MODULE_LICENSE("GPL");