Release 4.7 drivers/memory/mtk-smi.c
/*
* 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;
}
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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);
}
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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;
}
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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);
}
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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;
}
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static void
mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
{
/* Do nothing as the iommu is always enabled. */
}
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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);
}
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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;
}
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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;
}
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static int mtk_smi_common_remove(struct platform_device *pdev)
{
pm_runtime_disable(&pdev->dev);
return 0;
}
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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;
}
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subsys_initcall(mtk_smi_init);
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