drivers/memory/mtk-smi.c - kernel/quantenna - Git at Google

 /*
  * Copyright (c) 2015-2016 MediaTek Inc.
  * Author: Yong Wu <yong.wu@mediatek.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.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
 #include <linux/clk.h>
 #include <linux/component.h>
 #include <linux/device.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <soc/mediatek/smi.h>

 #define SMI_LARB_MMU_EN		0xf00

 struct mtk_smi {
 	struct device	*dev;
 	struct clk	*clk_apb, *clk_smi;
 };

 struct mtk_smi_larb { /* larb: local arbiter */
 	struct mtk_smi  smi;
 	void __iomem	*base;
 	struct device	*smi_common_dev;
 	u32		*mmu;
 };

 static int mtk_smi_enable(const struct mtk_smi *smi)
 {
 	int ret;

 	ret = pm_runtime_get_sync(smi->dev);
 	if (ret < 0)
 		return ret;

 	ret = clk_prepare_enable(smi->clk_apb);
 	if (ret)
 		goto err_put_pm;

 	ret = clk_prepare_enable(smi->clk_smi);
 	if (ret)
 		goto err_disable_apb;

 	return 0;

 err_disable_apb:
 	clk_disable_unprepare(smi->clk_apb);
 err_put_pm:
 	pm_runtime_put_sync(smi->dev);
 	return ret;
 }

 static void mtk_smi_disable(const struct mtk_smi *smi)
 {
 	clk_disable_unprepare(smi->clk_smi);
 	clk_disable_unprepare(smi->clk_apb);
 	pm_runtime_put_sync(smi->dev);
 }

 int mtk_smi_larb_get(struct device *larbdev)
 {
 	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
 	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
 	int ret;

 	/* Enable the smi-common's power and clocks */
 	ret = mtk_smi_enable(common);
 	if (ret)
 		return ret;

 	/* Enable the larb's power and clocks */
 	ret = mtk_smi_enable(&larb->smi);
 	if (ret) {
 		mtk_smi_disable(common);
 		return ret;
 	}

 	/* Configure the iommu info for this larb */
 	writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(mtk_smi_larb_get);

 void mtk_smi_larb_put(struct device *larbdev)
 {
 	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
 	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);

 	/*
 	 * Don't de-configure the iommu info for this larb since there may be
 	 * several modules in this larb.
 	 * The iommu info will be reset after power off.
 	 */

 	mtk_smi_disable(&larb->smi);
 	mtk_smi_disable(common);
 }
 EXPORT_SYMBOL_GPL(mtk_smi_larb_put);

 static int
 mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
 {
 	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
 	struct mtk_smi_iommu *smi_iommu = data;
 	unsigned int         i;

 	for (i = 0; i < smi_iommu->larb_nr; i++) {
 		if (dev == smi_iommu->larb_imu[i].dev) {
 			/* The 'mmu' may be updated in iommu-attach/detach. */
 			larb->mmu = &smi_iommu->larb_imu[i].mmu;
 			return 0;
 		}
 	}
 	return -ENODEV;
 }

 static void
 mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
 {
 	/* Do nothing as the iommu is always enabled. */
 }

 static const struct component_ops mtk_smi_larb_component_ops = {
 	.bind = mtk_smi_larb_bind,
 	.unbind = mtk_smi_larb_unbind,
 };

 static int mtk_smi_larb_probe(struct platform_device *pdev)
 {
 	struct mtk_smi_larb *larb;
 	struct resource *res;
 	struct device *dev = &pdev->dev;
 	struct device_node *smi_node;
 	struct platform_device *smi_pdev;

 	if (!dev->pm_domain)
 		return -EPROBE_DEFER;

 	larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
 	if (!larb)
 		return -ENOMEM;

 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	larb->base = devm_ioremap_resource(dev, res);
 	if (IS_ERR(larb->base))
 		return PTR_ERR(larb->base);

 	larb->smi.clk_apb = devm_clk_get(dev, "apb");
 	if (IS_ERR(larb->smi.clk_apb))
 		return PTR_ERR(larb->smi.clk_apb);

 	larb->smi.clk_smi = devm_clk_get(dev, "smi");
 	if (IS_ERR(larb->smi.clk_smi))
 		return PTR_ERR(larb->smi.clk_smi);
 	larb->smi.dev = dev;

 	smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
 	if (!smi_node)
 		return -EINVAL;

 	smi_pdev = of_find_device_by_node(smi_node);
 	of_node_put(smi_node);
 	if (smi_pdev) {
 		larb->smi_common_dev = &smi_pdev->dev;
 	} else {
 		dev_err(dev, "Failed to get the smi_common device\n");
 		return -EINVAL;
 	}

 	pm_runtime_enable(dev);
 	platform_set_drvdata(pdev, larb);
 	return component_add(dev, &mtk_smi_larb_component_ops);
 }

 static int mtk_smi_larb_remove(struct platform_device *pdev)
 {
 	pm_runtime_disable(&pdev->dev);
 	component_del(&pdev->dev, &mtk_smi_larb_component_ops);
 	return 0;
 }

 static const struct of_device_id mtk_smi_larb_of_ids[] = {
 	{ .compatible = "mediatek,mt8173-smi-larb",},
 	{}
 };

 static struct platform_driver mtk_smi_larb_driver = {
 	.probe	= mtk_smi_larb_probe,
 	.remove = mtk_smi_larb_remove,
 	.driver	= {
 		.name = "mtk-smi-larb",
 		.of_match_table = mtk_smi_larb_of_ids,
 	}
 };

 static int mtk_smi_common_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct mtk_smi *common;

 	if (!dev->pm_domain)
 		return -EPROBE_DEFER;

 	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
 	if (!common)
 		return -ENOMEM;
 	common->dev = dev;

 	common->clk_apb = devm_clk_get(dev, "apb");
 	if (IS_ERR(common->clk_apb))
 		return PTR_ERR(common->clk_apb);

 	common->clk_smi = devm_clk_get(dev, "smi");
 	if (IS_ERR(common->clk_smi))
 		return PTR_ERR(common->clk_smi);

 	pm_runtime_enable(dev);
 	platform_set_drvdata(pdev, common);
 	return 0;
 }

 static int mtk_smi_common_remove(struct platform_device *pdev)
 {
 	pm_runtime_disable(&pdev->dev);
 	return 0;
 }

 static const struct of_device_id mtk_smi_common_of_ids[] = {
 	{ .compatible = "mediatek,mt8173-smi-common", },
 	{}
 };

 static struct platform_driver mtk_smi_common_driver = {
 	.probe	= mtk_smi_common_probe,
 	.remove = mtk_smi_common_remove,
 	.driver	= {
 		.name = "mtk-smi-common",
 		.of_match_table = mtk_smi_common_of_ids,
 	}
 };

 static int __init mtk_smi_init(void)
 {
 	int ret;

 	ret = platform_driver_register(&mtk_smi_common_driver);
 	if (ret != 0) {
 		pr_err("Failed to register SMI driver\n");
 		return ret;
 	}

 	ret = platform_driver_register(&mtk_smi_larb_driver);
 	if (ret != 0) {
 		pr_err("Failed to register SMI-LARB driver\n");
 		goto err_unreg_smi;
 	}
 	return ret;

 err_unreg_smi:
 	platform_driver_unregister(&mtk_smi_common_driver);
 	return ret;
 }
 subsys_initcall(mtk_smi_init);
	/*
	* Copyright (c) 2015-2016 MediaTek Inc.
	* Author: Yong Wu <yong.wu@mediatek.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.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/
	#include <linux/clk.h>
	#include <linux/component.h>
	#include <linux/device.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_platform.h>
	#include <linux/platform_device.h>
	#include <linux/pm_runtime.h>
	#include <soc/mediatek/smi.h>

	#define SMI_LARB_MMU_EN 0xf00

	struct mtk_smi {
	struct device *dev;
	struct clk clk_apb, clk_smi;
	};

	struct mtk_smi_larb { /* larb: local arbiter */
	struct mtk_smi smi;
	void __iomem *base;
	struct device *smi_common_dev;
	u32 *mmu;
	};

	static int mtk_smi_enable(const struct mtk_smi *smi)
	{
	int ret;

	ret = pm_runtime_get_sync(smi->dev);
	if (ret < 0)
	return ret;

	ret = clk_prepare_enable(smi->clk_apb);
	if (ret)
	goto err_put_pm;

	ret = clk_prepare_enable(smi->clk_smi);
	if (ret)
	goto err_disable_apb;

	return 0;

	err_disable_apb:
	clk_disable_unprepare(smi->clk_apb);
	err_put_pm:
	pm_runtime_put_sync(smi->dev);
	return ret;
	}

	static void mtk_smi_disable(const struct mtk_smi *smi)
	{
	clk_disable_unprepare(smi->clk_smi);
	clk_disable_unprepare(smi->clk_apb);
	pm_runtime_put_sync(smi->dev);
	}

	int mtk_smi_larb_get(struct device *larbdev)
	{
	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
	int ret;

	/* Enable the smi-common's power and clocks */
	ret = mtk_smi_enable(common);
	if (ret)
	return ret;

	/* Enable the larb's power and clocks */
	ret = mtk_smi_enable(&larb->smi);
	if (ret) {
	mtk_smi_disable(common);
	return ret;
	}

	/* Configure the iommu info for this larb */
	writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);

	return 0;
	}
	EXPORT_SYMBOL_GPL(mtk_smi_larb_get);

	void mtk_smi_larb_put(struct device *larbdev)
	{
	struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
	struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);

	/*
	* Don't de-configure the iommu info for this larb since there may be
	* several modules in this larb.
	* The iommu info will be reset after power off.
	*/

	mtk_smi_disable(&larb->smi);
	mtk_smi_disable(common);
	}
	EXPORT_SYMBOL_GPL(mtk_smi_larb_put);

	static int
	mtk_smi_larb_bind(struct device dev, struct device master, void *data)
	{
	struct mtk_smi_larb *larb = dev_get_drvdata(dev);
	struct mtk_smi_iommu *smi_iommu = data;
	unsigned int i;

	for (i = 0; i < smi_iommu->larb_nr; i++) {
	if (dev == smi_iommu->larb_imu[i].dev) {
	/* The 'mmu' may be updated in iommu-attach/detach. */
	larb->mmu = &smi_iommu->larb_imu[i].mmu;
	return 0;
	}
	}
	return -ENODEV;
	}

	static void
	mtk_smi_larb_unbind(struct device dev, struct device master, void *data)
	{
	/* Do nothing as the iommu is always enabled. */
	}

	static const struct component_ops mtk_smi_larb_component_ops = {
	.bind = mtk_smi_larb_bind,
	.unbind = mtk_smi_larb_unbind,
	};

	static int mtk_smi_larb_probe(struct platform_device *pdev)
	{
	struct mtk_smi_larb *larb;
	struct resource *res;
	struct device *dev = &pdev->dev;
	struct device_node *smi_node;
	struct platform_device *smi_pdev;

	if (!dev->pm_domain)
	return -EPROBE_DEFER;

	larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
	if (!larb)
	return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	larb->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(larb->base))
	return PTR_ERR(larb->base);

	larb->smi.clk_apb = devm_clk_get(dev, "apb");
	if (IS_ERR(larb->smi.clk_apb))
	return PTR_ERR(larb->smi.clk_apb);

	larb->smi.clk_smi = devm_clk_get(dev, "smi");
	if (IS_ERR(larb->smi.clk_smi))
	return PTR_ERR(larb->smi.clk_smi);
	larb->smi.dev = dev;

	smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
	if (!smi_node)
	return -EINVAL;

	smi_pdev = of_find_device_by_node(smi_node);
	of_node_put(smi_node);
	if (smi_pdev) {
	larb->smi_common_dev = &smi_pdev->dev;
	} else {
	dev_err(dev, "Failed to get the smi_common device\n");
	return -EINVAL;
	}

	pm_runtime_enable(dev);
	platform_set_drvdata(pdev, larb);
	return component_add(dev, &mtk_smi_larb_component_ops);
	}

	static int mtk_smi_larb_remove(struct platform_device *pdev)
	{
	pm_runtime_disable(&pdev->dev);
	component_del(&pdev->dev, &mtk_smi_larb_component_ops);
	return 0;
	}

	static const struct of_device_id mtk_smi_larb_of_ids[] = {
	{ .compatible = "mediatek,mt8173-smi-larb",},
	{}
	};

	static struct platform_driver mtk_smi_larb_driver = {
	.probe = mtk_smi_larb_probe,
	.remove = mtk_smi_larb_remove,
	.driver = {
	.name = "mtk-smi-larb",
	.of_match_table = mtk_smi_larb_of_ids,
	}
	};

	static int mtk_smi_common_probe(struct platform_device *pdev)
	{
	struct device *dev = &pdev->dev;
	struct mtk_smi *common;

	if (!dev->pm_domain)
	return -EPROBE_DEFER;

	common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
	if (!common)
	return -ENOMEM;
	common->dev = dev;

	common->clk_apb = devm_clk_get(dev, "apb");
	if (IS_ERR(common->clk_apb))
	return PTR_ERR(common->clk_apb);

	common->clk_smi = devm_clk_get(dev, "smi");
	if (IS_ERR(common->clk_smi))
	return PTR_ERR(common->clk_smi);

	pm_runtime_enable(dev);
	platform_set_drvdata(pdev, common);
	return 0;
	}

	static int mtk_smi_common_remove(struct platform_device *pdev)
	{
	pm_runtime_disable(&pdev->dev);
	return 0;
	}

	static const struct of_device_id mtk_smi_common_of_ids[] = {
	{ .compatible = "mediatek,mt8173-smi-common", },
	{}
	};

	static struct platform_driver mtk_smi_common_driver = {
	.probe = mtk_smi_common_probe,
	.remove = mtk_smi_common_remove,
	.driver = {
	.name = "mtk-smi-common",
	.of_match_table = mtk_smi_common_of_ids,
	}
	};

	static int __init mtk_smi_init(void)
	{
	int ret;

	ret = platform_driver_register(&mtk_smi_common_driver);
	if (ret != 0) {
	pr_err("Failed to register SMI driver\n");
	return ret;
	}

	ret = platform_driver_register(&mtk_smi_larb_driver);
	if (ret != 0) {
	pr_err("Failed to register SMI-LARB driver\n");
	goto err_unreg_smi;
	}
	return ret;

	err_unreg_smi:
	platform_driver_unregister(&mtk_smi_common_driver);
	return ret;
	}
	subsys_initcall(mtk_smi_init);