[PATCH 1/5] soc: mediatek: Add SMI driver

yong.wu
2015-03-06T10:50:54Z

From: Yong Wu <yong.wu@mediatek.com>

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@mediatek.com>
---
drivers/soc/mediatek/Kconfig | 7 ++
drivers/soc/mediatek/Makefile | 1 +
drivers/soc/mediatek/mt8173-smi.c | 143 ++++++++++++++++++++++++++++++++++++++
include/linux/mtk-smi.h | 40 +++++++++++
4 files changed, 191 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 729f93e..27fb26c 100644
--- a/drivers/soc/mediatek/Kconfig
+++ b/drivers/soc/mediatek/Kconfig
@@ -20,3 +20,10 @@ config MT8173_PMIC_WRAP
PMIC wrapper is a proprietary hardware in MT8173 to make
communication protocols to access PMIC device.
This driver implement access protocols for MT8173.
+
+config MTK_SMI
+ bool
+ help
+ Smi help enable/disable iommu in mt8173 and control the
+ clock of each local arbiter.
+ It should be true while MTK_IOMMU enable.
diff --git a/drivers/soc/mediatek/Makefile b/drivers/soc/mediatek/Makefile
index 9b5709b..cdfe95c 100644
--- a/drivers/soc/mediatek/Makefile
+++ b/drivers/soc/mediatek/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_MT8135_PMIC_WRAP) += mt8135-pmic-wrap.o
obj-$(CONFIG_MT8173_PMIC_WRAP) += mt8173-pmic-wrap.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..4e3fab9
--- /dev/null
+++ b/drivers/soc/mediatek/mt8173-smi.c
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2014-2015 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/io.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/mm.h>
+
+#define SMI_LARB_MMU_EN (0xf00)
+#define F_SMI_MMU_EN(port) (1 << (port))
+
+struct mtk_smi_larb {
+ void __iomem *larb_base;
+ struct clk *larb_clk[3];/* each larb has 3 clk at most */
+};
+
+static const char * const mtk_smi_clk_name[] = {
+ "larb_sub0", "larb_sub1", "larb_sub2"
+};
+
+static const struct of_device_id mtk_smi_of_ids[] = {
+ { .compatible = "mediatek,mt8173-smi-larb",
+ },
+ {}
+};
+
+int mtk_smi_larb_get(struct platform_device *plarbdev)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(&plarbdev->dev);
+ int i, ret = 0;
+
+ for (i = 0; i < 3; i++)
+ if (larbpriv->larb_clk[i]) {
+ ret = clk_prepare_enable(larbpriv->larb_clk[i]);
+ if (ret) {
+ dev_err(&plarbdev->dev,
+ "failed to enable larbclk%d:%d\n",
+ i, ret);
+ break;
+ }
+ }
+ return ret;
+}
+
+void mtk_smi_larb_put(struct platform_device *plarbdev)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(&plarbdev->dev);
+ int i;
+
+ for (i = 2; i >= 0; i--)
+ if (larbpriv->larb_clk[i])
+ clk_disable_unprepare(larbpriv->larb_clk[i]);
+}
+
+int mtk_smi_config_port(struct platform_device *plarbdev,
+ unsigned int larbportid)
+{
+ struct mtk_smi_larb *larbpriv = dev_get_drvdata(&plarbdev->dev);
+ int ret;
+ u32 reg;
+
+ ret = mtk_smi_larb_get(plarbdev);
+ if (ret)
+ return ret;
+
+ reg = readl(larbpriv->larb_base + SMI_LARB_MMU_EN);
+ reg &= ~F_SMI_MMU_EN(larbportid);
+ reg |= F_SMI_MMU_EN(larbportid);
+ writel(reg, larbpriv->larb_base + SMI_LARB_MMU_EN);
+
+ mtk_smi_larb_put(plarbdev);
+
+ return 0;
+}
+
+static int mtk_smi_probe(struct platform_device *pdev)
+{
+ struct mtk_smi_larb *larbpriv;
+ struct resource *res;
+ struct device *dev = &pdev->dev;
+ unsigned int i;
+
+ larbpriv = devm_kzalloc(dev, sizeof(struct mtk_smi_larb), GFP_KERNEL);
+ if (!larbpriv)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ larbpriv->larb_base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(larbpriv->larb_base)) {
+ dev_err(dev, "larbbase %p err\n", larbpriv->larb_base);
+ return PTR_ERR(larbpriv->larb_base);
+ }
+
+ for (i = 0; i < 3; i++) {
+ larbpriv->larb_clk[i] = devm_clk_get(dev, mtk_smi_clk_name[i]);
+
+ if (IS_ERR(larbpriv->larb_clk[i])) {
+ if (i == 2) {/* some larb may have only 2 clock */
+ larbpriv->larb_clk[i] = NULL;
+ } else {
+ dev_err(dev, "clock-%d err: %p\n", i,
+ larbpriv->larb_clk[i]);
+ return PTR_ERR(larbpriv->larb_clk[i]);
+ }
+ }
+ }
+ dev_set_drvdata(dev, larbpriv);
+ return 0;
+}
+
+static int mtk_smi_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static struct platform_driver mtk_smi_driver = {
+ .probe = mtk_smi_probe,
+ .remove = mtk_smi_remove,
+ .driver = {
+ .name = "mtksmi",
+ .of_match_table = mtk_smi_of_ids,
+ }
+};
+
+static int __init mtk_smi_init(void)
+{
+ return platform_driver_register(&mtk_smi_driver);
+}
+
+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..1411f7b
--- /dev/null
+++ b/include/linux/mtk-smi.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2014-2015 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.
+ */
+#ifndef MTK_IOMMU_SMI_H
+#define MTK_IOMMU_SMI_H
+#include <linux/platform_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 platform_device *pdev,
+ unsigned int larbportid);
+
+/*
+ * 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 platform_device *plarbdev);
+void mtk_smi_larb_put(struct platform_device *plarbdev);
+
+#endif
--
1.8.1.1.dirty