[PATCH v2 4/6] soc: mediatek: Add SMI driver
Yong Wu
yong.wu at mediatek.com
Fri May 15 02:43:27 PDT 2015
This patch add SMI(Smart Multimedia Interface) driver. This driver is
responsible to enable/disable iommu and control the clocks of each local arbiter.
Signed-off-by: Yong Wu <yong.wu at mediatek.com>
---
drivers/soc/mediatek/Kconfig | 6 +
drivers/soc/mediatek/Makefile | 1 +
drivers/soc/mediatek/mt8173-smi.c | 298 ++++++++++++++++++++++++++++++++++++++
include/linux/mtk-smi.h | 39 +++++
4 files changed, 344 insertions(+)
create mode 100644 drivers/soc/mediatek/mt8173-smi.c
create mode 100644 include/linux/mtk-smi.h
diff --git a/drivers/soc/mediatek/Kconfig b/drivers/soc/mediatek/Kconfig
index 1d34819..5935ead 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -15,3 +15,9 @@ config MTK_SCPSYS
help
Say yes here to add support for the MediaTek SCPSYS power domain
driver.
+
+config MTK_SMI
+ bool
+ help
+ Smi help enable/disable iommu in MediaTek SoCs and control the clock
+ for each local arbiter.
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index ce88693..c086261 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_MTK_PMIC_WRAP) += mtk-pmic-wrap.o
obj-$(CONFIG_MTK_SCPSYS) += mtk-scpsys.o
+obj-$(CONFIG_MTK_SMI) += mt8173-smi.o
diff --git a/drivers/soc/mediatek/mt8173-smi.c b/drivers/soc/mediatek/mt8173-smi.c
new file mode 100644
index 0000000..67bccec
--- /dev/null
+++ b/drivers/soc/mediatek/mt8173-smi.c
@@ -0,0 +1,298 @@
+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Yong Wu <yong.wu at 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/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/mm.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/mtk-smi.h>
+
+#define SMI_LARB_MMU_EN (0xf00)
+#define F_SMI_MMU_EN(port) (1 << (port))
+
+enum {
+ MTK_CLK_APB,
+ MTK_CLK_SMI,
+ MTK_CLK_MAX,
+};
+
+struct mtk_smi_common {
+ void __iomem *base;
+ struct clk *clk[MTK_CLK_MAX];
+};
+
+struct mtk_smi_larb {
+ void __iomem *base;
+ spinlock_t portlock; /* lock for config port */
+ struct clk *clk[MTK_CLK_MAX];
+ struct device *smi;
+};
+
+static const char * const mtk_smi_clk_name[MTK_CLK_MAX] = {
+ "apb", "smi"
+};
+
+static int mtk_smi_common_get(struct device *smidev)
+{
+ struct mtk_smi_common *smipriv = dev_get_drvdata(smidev);
+ int i, ret;
+
+ for (i = MTK_CLK_APB; i < MTK_CLK_MAX; i++) {
+ ret = clk_enable(smipriv->clk[i]);
+ if (ret) {
+ dev_err(smidev,
+ "Failed to enable the clock of smi_common\n");
+ goto err_smi_clk;
+ }
+ }
+ return ret;
+
+err_smi_clk:
+ if (i == MTK_CLK_SMI)
+ clk_disable(smipriv->clk[MTK_CLK_APB]);
+ return ret;
+}
+
+static void mtk_smi_common_put(struct device *smidev)
+{
+ struct mtk_smi_common *smipriv = dev_get_drvdata(smidev);
+ int i;
+
+ for (i = MTK_CLK_SMI; i >= MTK_CLK_APB; i--)
+ clk_disable(smipriv->clk[i]);
+}
+
+int mtk_smi_larb_get(struct device *larbdev)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(larbdev);
+ int i, ret = 0;
+
+ ret = mtk_smi_common_get(larbpriv->smi);
+ if (ret)
+ return ret;
+
+ for (i = MTK_CLK_APB; i < MTK_CLK_MAX; i++) {
+ ret = clk_enable(larbpriv->clk[i]);
+ if (ret) {
+ dev_err(larbdev,
+ "Failed to enable larb clock%d. ret 0x%x\n",
+ i, ret);
+ goto err_larb_clk;
+ }
+ }
+
+ return ret;
+
+err_larb_clk:
+ if (i == MTK_CLK_SMI)
+ clk_disable(larbpriv->clk[MTK_CLK_APB]);
+ mtk_smi_common_put(larbpriv->smi);
+ return ret;
+}
+
+void mtk_smi_larb_put(struct device *larbdev)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(larbdev);
+ int i;
+
+ for (i = MTK_CLK_SMI; i >= MTK_CLK_APB; i--)
+ clk_disable(larbpriv->clk[i]);
+
+ mtk_smi_common_put(larbpriv->smi);
+}
+
+int mtk_smi_config_port(struct device *larbdev, unsigned int larbportid,
+ bool iommuen)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(larbdev);
+ unsigned long flags;
+ int ret;
+ u32 reg;
+
+ ret = mtk_smi_larb_get(larbdev);
+ if (ret)
+ return ret;
+
+ spin_lock_irqsave(&larbpriv->portlock, flags);
+ reg = readl(larbpriv->base + SMI_LARB_MMU_EN);
+ reg &= ~F_SMI_MMU_EN(larbportid);
+ if (iommuen)
+ reg |= F_SMI_MMU_EN(larbportid);
+ writel(reg, larbpriv->base + SMI_LARB_MMU_EN);
+ spin_unlock_irqrestore(&larbpriv->portlock, flags);
+
+ mtk_smi_larb_put(larbdev);
+
+ return 0;
+}
+
+static int mtk_smi_larb_probe(struct platform_device *pdev)
+{
+ struct mtk_smi_larb *larbpriv;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+ struct device_node *smi_node;
+ struct platform_device *smi_pdev;
+ int i, ret;
+
+ larbpriv = devm_kzalloc(dev, sizeof(struct mtk_smi_larb), GFP_KERNEL);
+ if (!larbpriv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ larbpriv->base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(larbpriv->base)) {
+ dev_err(dev, "Failed to get the larbbase (0x%lx)\n",
+ PTR_ERR(larbpriv->base));
+ return PTR_ERR(larbpriv->base);
+ }
+
+ for (i = MTK_CLK_APB; i < MTK_CLK_MAX; i++) {
+ larbpriv->clk[i] = devm_clk_get(dev, mtk_smi_clk_name[i]);
+
+ if (IS_ERR(larbpriv->clk[i])) {
+ ret = PTR_ERR(larbpriv->clk[i]);
+ dev_err(dev, "Failed to get larb%d clock (0x%x)\n",
+ i, ret);
+ goto fail_larb_clk;
+ } else {
+ ret = clk_prepare(larbpriv->clk[i]);
+ if (ret) {
+ dev_err(dev, "Failed to prepare larb clock%d (0x%x)\n",
+ i, ret);
+ goto fail_larb_clk;
+ }
+ }
+ }
+
+ smi_node = of_parse_phandle(dev->of_node, "smi", 0);
+ if (!smi_node) {
+ dev_err(dev, "Failed to get smi node\n");
+ ret = -EINVAL;
+ goto fail_larb_clk;
+ }
+
+ smi_pdev = of_find_device_by_node(smi_node);
+ of_node_put(smi_node);
+ if (smi_pdev) {
+ larbpriv->smi = &smi_pdev->dev;
+ } else {
+ dev_err(dev, "Failed to get the smi_common device\n");
+ ret = -EINVAL;
+ goto fail_larb_clk;
+ }
+
+ spin_lock_init(&larbpriv->portlock);
+ dev_set_drvdata(dev, larbpriv);
+ return 0;
+
+fail_larb_clk:
+ while (--i >= MTK_CLK_APB)
+ clk_unprepare(larbpriv->clk[i]);
+ return ret;
+}
+
+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,
+ .driver = {
+ .name = "mtksmilarb",
+ .of_match_table = mtk_smi_larb_of_ids,
+ }
+};
+
+static int mtk_smi_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_smi_common *smipriv;
+ int ret, i;
+
+ smipriv = devm_kzalloc(dev, sizeof(*smipriv), GFP_KERNEL);
+ if (!smipriv)
+ return -ENOMEM;
+
+ for (i = MTK_CLK_APB; i < MTK_CLK_MAX; i++) {
+ smipriv->clk[i] = devm_clk_get(dev, mtk_smi_clk_name[i]);
+
+ if (IS_ERR(smipriv->clk[i])) {
+ ret = PTR_ERR(smipriv->clk[i]);
+ dev_err(dev, "Failed to get smi-%s clock (0x%x)\n",
+ mtk_smi_clk_name[i], ret);
+ goto fail_smi_clk;
+ } else {
+ ret = clk_prepare(smipriv->clk[i]);
+ if (ret) {
+ dev_err(dev, "Failed to prepare smi%d clock 0x%x\n",
+ i, ret);
+ goto fail_smi_clk;
+ }
+ }
+ }
+
+ dev_set_drvdata(dev, smipriv);
+ return ret;
+
+fail_smi_clk:
+ if (i == MTK_CLK_SMI)
+ clk_unprepare(smipriv->clk[MTK_CLK_APB]);
+ return ret;
+}
+
+static const struct of_device_id mtk_smi_of_ids[] = {
+ { .compatible = "mediatek,mt8173-smi",
+ },
+ {}
+};
+
+static struct platform_driver mtk_smi_driver = {
+ .probe = mtk_smi_probe,
+ .driver = {
+ .name = "mtksmi",
+ .of_match_table = mtk_smi_of_ids,
+ }
+};
+
+static int __init mtk_smi_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&mtk_smi_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 fail_smi_larb;
+ }
+ return ret;
+
+fail_smi_larb:
+ platform_driver_unregister(&mtk_smi_driver);
+ return ret;
+}
+
+subsys_initcall(mtk_smi_init);
+
diff --git a/include/linux/mtk-smi.h b/include/linux/mtk-smi.h
new file mode 100644
index 0000000..ad07e6a
--- /dev/null
+++ b/include/linux/mtk-smi.h
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2014-2015 MediaTek Inc.
+ * Author: Yong Wu <yong.wu at 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.
+ */
+#ifndef MTK_IOMMU_SMI_H
+#define MTK_IOMMU_SMI_H
+#include <linux/device.h>
+
+/*
+ * Enable iommu for each port, it is only for iommu.
+ *
+ * Returns 0 if successfully, others if failed.
+ */
+int mtk_smi_config_port(struct device *larbdev, unsigned int larbportid,
+ bool iommuen);
+/*
+ * The multimedia module should call the two function below
+ * which help open/close the clock of the larb.
+ * so the client dtsi should add the larb like "larb = <&larb0>"
+ * to get platform_device.
+ *
+ * mtk_smi_larb_get should be called before the multimedia h/w work.
+ * mtk_smi_larb_put should be called after h/w done.
+ *
+ * Returns 0 if successfully, others if failed.
+ */
+int mtk_smi_larb_get(struct device *plarbdev);
+void mtk_smi_larb_put(struct device *plarbdev);
+
+#endif
--
1.8.1.1.dirty
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