276 lines
6.3 KiB
C
276 lines
6.3 KiB
C
/*
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* Copyright (c) 2015-2016 MediaTek Inc.
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* Author: Yong Wu <yong.wu@mediatek.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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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk.h>
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#include <linux/component.h>
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <soc/mediatek/smi.h>
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#define SMI_LARB_MMU_EN 0xf00
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struct mtk_smi {
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struct device *dev;
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struct clk *clk_apb, *clk_smi;
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};
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struct mtk_smi_larb { /* larb: local arbiter */
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struct mtk_smi smi;
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void __iomem *base;
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struct device *smi_common_dev;
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u32 *mmu;
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};
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static int mtk_smi_enable(const struct mtk_smi *smi)
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{
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int ret;
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ret = pm_runtime_get_sync(smi->dev);
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if (ret < 0)
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return ret;
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ret = clk_prepare_enable(smi->clk_apb);
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if (ret)
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goto err_put_pm;
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ret = clk_prepare_enable(smi->clk_smi);
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if (ret)
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goto err_disable_apb;
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return 0;
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err_disable_apb:
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clk_disable_unprepare(smi->clk_apb);
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err_put_pm:
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pm_runtime_put_sync(smi->dev);
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return ret;
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}
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static void mtk_smi_disable(const struct mtk_smi *smi)
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{
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clk_disable_unprepare(smi->clk_smi);
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clk_disable_unprepare(smi->clk_apb);
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pm_runtime_put_sync(smi->dev);
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}
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int mtk_smi_larb_get(struct device *larbdev)
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{
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struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
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struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
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int ret;
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/* Enable the smi-common's power and clocks */
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ret = mtk_smi_enable(common);
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if (ret)
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return ret;
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/* Enable the larb's power and clocks */
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ret = mtk_smi_enable(&larb->smi);
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if (ret) {
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mtk_smi_disable(common);
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return ret;
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}
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/* Configure the iommu info for this larb */
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writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN);
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return 0;
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}
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EXPORT_SYMBOL_GPL(mtk_smi_larb_get);
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void mtk_smi_larb_put(struct device *larbdev)
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{
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struct mtk_smi_larb *larb = dev_get_drvdata(larbdev);
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struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev);
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/*
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* Don't de-configure the iommu info for this larb since there may be
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* several modules in this larb.
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* The iommu info will be reset after power off.
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*/
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mtk_smi_disable(&larb->smi);
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mtk_smi_disable(common);
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}
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EXPORT_SYMBOL_GPL(mtk_smi_larb_put);
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static int
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mtk_smi_larb_bind(struct device *dev, struct device *master, void *data)
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{
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struct mtk_smi_larb *larb = dev_get_drvdata(dev);
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struct mtk_smi_iommu *smi_iommu = data;
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unsigned int i;
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for (i = 0; i < smi_iommu->larb_nr; i++) {
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if (dev == smi_iommu->larb_imu[i].dev) {
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/* The 'mmu' may be updated in iommu-attach/detach. */
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larb->mmu = &smi_iommu->larb_imu[i].mmu;
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return 0;
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}
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}
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return -ENODEV;
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}
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static void
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mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data)
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{
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/* Do nothing as the iommu is always enabled. */
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}
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static const struct component_ops mtk_smi_larb_component_ops = {
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.bind = mtk_smi_larb_bind,
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.unbind = mtk_smi_larb_unbind,
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};
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static int mtk_smi_larb_probe(struct platform_device *pdev)
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{
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struct mtk_smi_larb *larb;
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struct resource *res;
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struct device *dev = &pdev->dev;
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struct device_node *smi_node;
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struct platform_device *smi_pdev;
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if (!dev->pm_domain)
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return -EPROBE_DEFER;
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larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL);
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if (!larb)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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larb->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(larb->base))
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return PTR_ERR(larb->base);
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larb->smi.clk_apb = devm_clk_get(dev, "apb");
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if (IS_ERR(larb->smi.clk_apb))
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return PTR_ERR(larb->smi.clk_apb);
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larb->smi.clk_smi = devm_clk_get(dev, "smi");
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if (IS_ERR(larb->smi.clk_smi))
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return PTR_ERR(larb->smi.clk_smi);
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larb->smi.dev = dev;
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smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0);
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if (!smi_node)
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return -EINVAL;
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smi_pdev = of_find_device_by_node(smi_node);
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of_node_put(smi_node);
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if (smi_pdev) {
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larb->smi_common_dev = &smi_pdev->dev;
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} else {
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dev_err(dev, "Failed to get the smi_common device\n");
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return -EINVAL;
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}
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pm_runtime_enable(dev);
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platform_set_drvdata(pdev, larb);
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return component_add(dev, &mtk_smi_larb_component_ops);
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}
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static int mtk_smi_larb_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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component_del(&pdev->dev, &mtk_smi_larb_component_ops);
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return 0;
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}
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static const struct of_device_id mtk_smi_larb_of_ids[] = {
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{ .compatible = "mediatek,mt8173-smi-larb",},
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{}
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};
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static struct platform_driver mtk_smi_larb_driver = {
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.probe = mtk_smi_larb_probe,
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.remove = mtk_smi_larb_remove,
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.driver = {
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.name = "mtk-smi-larb",
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.of_match_table = mtk_smi_larb_of_ids,
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}
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};
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static int mtk_smi_common_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct mtk_smi *common;
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if (!dev->pm_domain)
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return -EPROBE_DEFER;
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common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL);
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if (!common)
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return -ENOMEM;
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common->dev = dev;
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common->clk_apb = devm_clk_get(dev, "apb");
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if (IS_ERR(common->clk_apb))
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return PTR_ERR(common->clk_apb);
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common->clk_smi = devm_clk_get(dev, "smi");
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if (IS_ERR(common->clk_smi))
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return PTR_ERR(common->clk_smi);
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pm_runtime_enable(dev);
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platform_set_drvdata(pdev, common);
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return 0;
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}
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static int mtk_smi_common_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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return 0;
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}
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static const struct of_device_id mtk_smi_common_of_ids[] = {
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{ .compatible = "mediatek,mt8173-smi-common", },
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{}
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};
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static struct platform_driver mtk_smi_common_driver = {
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.probe = mtk_smi_common_probe,
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.remove = mtk_smi_common_remove,
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.driver = {
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.name = "mtk-smi-common",
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.of_match_table = mtk_smi_common_of_ids,
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}
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};
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static int __init mtk_smi_init(void)
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{
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int ret;
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ret = platform_driver_register(&mtk_smi_common_driver);
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if (ret != 0) {
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pr_err("Failed to register SMI driver\n");
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return ret;
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}
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ret = platform_driver_register(&mtk_smi_larb_driver);
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if (ret != 0) {
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pr_err("Failed to register SMI-LARB driver\n");
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goto err_unreg_smi;
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}
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return ret;
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err_unreg_smi:
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platform_driver_unregister(&mtk_smi_common_driver);
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return ret;
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}
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subsys_initcall(mtk_smi_init);
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