--- /dev/null
+/*
+ * 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;
+}
+
+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);
+}
+
+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);
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff