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@xxxxxxxxxxxx> --- drivers/memory/Kconfig | 8 ++ drivers/memory/Makefile | 1 + drivers/memory/mtk-smi.c | 285 ++++++++++++++++++++++++++++++++++++++++++++ include/soc/mediatek/smi.h | 60 ++++++++++ 4 files changed, 354 insertions(+) create mode 100644 drivers/memory/mtk-smi.c create mode 100644 include/soc/mediatek/smi.h diff --git a/drivers/memory/Kconfig b/drivers/memory/Kconfig index 8406c668..c0e1607 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -100,6 +100,14 @@ config JZ4780_NEMC the Ingenic JZ4780. This controller is used to handle external memory devices such as NAND and SRAM. +config MTK_SMI + bool + depends on ARCH_MEDIATEK || COMPILE_TEST + help + This driver is for the Memory Controller module in MediaTek SoCs, + mainly help enable/disable iommu and control the clock for each + local arbiter. + source "drivers/memory/tegra/Kconfig" endif diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index b670441..f854e40 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -14,5 +14,6 @@ obj-$(CONFIG_FSL_IFC) += fsl_ifc.o obj-$(CONFIG_MVEBU_DEVBUS) += mvebu-devbus.o obj-$(CONFIG_TEGRA20_MC) += tegra20-mc.o obj-$(CONFIG_JZ4780_NEMC) += jz4780-nemc.o +obj-$(CONFIG_MTK_SMI) += mtk-smi.o obj-$(CONFIG_TEGRA_MC) += tegra/ diff --git a/drivers/memory/mtk-smi.c b/drivers/memory/mtk-smi.c new file mode 100644 index 0000000..0917d6c --- /dev/null +++ b/drivers/memory/mtk-smi.c @@ -0,0 +1,285 @@ +/* + * Copyright (c) 2014-2015 MediaTek Inc. + * Author: Yong Wu <yong.wu@xxxxxxxxxxxx> + * + * 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/platform_device.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/pm_runtime.h> +#include <soc/mediatek/smi.h> + +#define SMI_LARB_MMU_EN 0xf00 +#define F_SMI_MMU_EN(port) BIT(port) + +struct mtk_smi_common { + struct clk *clk_apb; + struct clk *clk_smi; +}; + +struct mtk_smi_larb { + void __iomem *base; + struct clk *clk_apb; + struct clk *clk_smi; + struct device *smi; +}; + +struct mtk_larb_mmu { + u32 mmu; +}; + +static int mtk_smi_common_get(struct device *smidev) +{ + struct mtk_smi_common *smipriv = dev_get_drvdata(smidev); + int ret; + + ret = pm_runtime_get_sync(smidev); + if (ret < 0) + return ret; + + ret = clk_prepare_enable(smipriv->clk_apb); + if (ret) { + dev_err(smidev, "Failed to enable the apb clock\n"); + goto err_put_pm; + } + ret = clk_prepare_enable(smipriv->clk_smi); + if (ret) { + dev_err(smidev, "Failed to enable the smi clock\n"); + goto err_disable_apb; + } + return ret; + +err_disable_apb: + clk_disable_unprepare(smipriv->clk_apb); +err_put_pm: + pm_runtime_put(smidev); + return ret; +} + +static void mtk_smi_common_put(struct device *smidev) +{ + struct mtk_smi_common *smipriv = dev_get_drvdata(smidev); + + clk_disable_unprepare(smipriv->clk_smi); + clk_disable_unprepare(smipriv->clk_apb); + pm_runtime_put(smidev); +} + +int mtk_smi_larb_get(struct device *larbdev) +{ + struct mtk_smi_larb *larbpriv = dev_get_drvdata(larbdev); + struct mtk_larb_mmu *mmucfg = larbdev->archdata.iommu; + int ret; + + ret = mtk_smi_common_get(larbpriv->smi); + if (ret) + return ret; + + ret = pm_runtime_get_sync(larbdev); + if (ret < 0) + goto err_put_smicommon; + + ret = clk_prepare_enable(larbpriv->clk_apb); + if (ret) { + dev_err(larbdev, "Failed to enable the apb clock\n"); + goto err_put_pm; + } + + ret = clk_prepare_enable(larbpriv->clk_smi); + if (ret) { + dev_err(larbdev, "Failed to enable the smi clock\n"); + goto err_disable_apb; + } + + /* config iommu */ + writel(mmucfg->mmu, larbpriv->base + SMI_LARB_MMU_EN); + + return ret; + +err_disable_apb: + clk_disable_unprepare(larbpriv->clk_apb); +err_put_pm: + pm_runtime_put(larbdev); +err_put_smicommon: + 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); + + clk_disable_unprepare(larbpriv->clk_smi); + clk_disable_unprepare(larbpriv->clk_apb); + pm_runtime_put(larbdev); + mtk_smi_common_put(larbpriv->smi); +} + +int mtk_smi_config_port(struct device *larbdev, unsigned int larbportid, + bool enable) +{ + struct mtk_larb_mmu *mmucfg = larbdev->archdata.iommu; + + if (!mmucfg) { + mmucfg = kzalloc(sizeof(*mmucfg), GFP_KERNEL); + if (!mmucfg) + return -ENOMEM; + larbdev->archdata.iommu = mmucfg; + } + + dev_dbg(larbdev, "%s iommu port id %d\n", + enable ? "enable" : "disable", larbportid); + + if (enable) + mmucfg->mmu |= F_SMI_MMU_EN(larbportid); + else + mmucfg->mmu &= ~F_SMI_MMU_EN(larbportid); + + 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; + + larbpriv = devm_kzalloc(dev, sizeof(*larbpriv), 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)) + return PTR_ERR(larbpriv->base); + + larbpriv->clk_apb = devm_clk_get(dev, "apb"); + if (IS_ERR(larbpriv->clk_apb)) + return PTR_ERR(larbpriv->clk_apb); + + larbpriv->clk_smi = devm_clk_get(dev, "smi"); + if (IS_ERR(larbpriv->clk_smi)) + return PTR_ERR(larbpriv->clk_smi); + + 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) { + larbpriv->smi = &smi_pdev->dev; + } else { + dev_err(dev, "Failed to get the smi_common device\n"); + return -EINVAL; + } + + pm_runtime_enable(dev); + dev_set_drvdata(dev, larbpriv); + return 0; +} + +static int mtk_smi_larb_remove(struct platform_device *pdev) +{ + struct mtk_larb_mmu *mmucfg = pdev->dev.archdata.iommu; + + kfree(mmucfg); + pm_runtime_disable(&pdev->dev); + 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_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct mtk_smi_common *smipriv; + int ret; + + smipriv = devm_kzalloc(dev, sizeof(*smipriv), GFP_KERNEL); + if (!smipriv) + return -ENOMEM; + + smipriv->clk_apb = devm_clk_get(dev, "apb"); + if (IS_ERR(smipriv->clk_apb)) + return PTR_ERR(smipriv->clk_apb); + + smipriv->clk_smi = devm_clk_get(dev, "smi"); + if (IS_ERR(smipriv->clk_smi)) + return PTR_ERR(smipriv->clk_smi); + + pm_runtime_enable(dev); + dev_set_drvdata(dev, smipriv); + return ret; +} + +static int mtk_smi_remove(struct platform_device *pdev) +{ + pm_runtime_disable(&pdev->dev); + return 0; +} + +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, + .remove = mtk_smi_remove, + .driver = { + .name = "mtk-smi", + .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 err_unreg_smi; + } + return ret; + +err_unreg_smi: + platform_driver_unregister(&mtk_smi_driver); + return ret; +} + +subsys_initcall(mtk_smi_init); diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h new file mode 100644 index 0000000..feb1180 --- /dev/null +++ b/include/soc/mediatek/smi.h @@ -0,0 +1,60 @@ +/* + * Copyright (c) 2014-2015 MediaTek Inc. + * Author: Yong Wu <yong.wu@xxxxxxxxxxxx> + * + * 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> + +#ifdef CONFIG_MTK_SMI + +/* + * Record the iommu info for each port in the local arbiter. + * 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 two function below config iommu and enable/disable the clock + * for the larb. + * + * mtk_smi_larb_get must be called before the multimedia HW work. + * mtk_smi_larb_put must be called after HW done. + * Both should be called in non-atomic context. + * + * Returns 0 if successfully, others if failed. + */ +int mtk_smi_larb_get(struct device *larbdev); +void mtk_smi_larb_put(struct device *larbdev); + +#else + +static int +mtk_smi_config_port(struct device *larbdev, unsigned int larbportid, + bool iommuen) +{ + return 0; +} + +static inline int mtk_smi_larb_get(struct device *larbdev) +{ + return 0; +} + +static inline void mtk_smi_larb_put(struct device *larbdev) { } + +#endif + +#endif -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html