Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933291AbbLHJuV (ORCPT ); Tue, 8 Dec 2015 04:50:21 -0500 Received: from mailgw01.mediatek.com ([210.61.82.183]:50750 "EHLO mailgw01.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S932645AbbLHJuO (ORCPT ); Tue, 8 Dec 2015 04:50:14 -0500 X-Listener-Flag: 11101 From: Yong Wu To: Joerg Roedel , Thierry Reding , Mark Rutland , Matthias Brugger CC: Robin Murphy , Will Deacon , Daniel Kurtz , Tomasz Figa , Lucas Stach , Rob Herring , Catalin Marinas , , Sasha Hauer , , , , , , , , , , , Yong Wu Subject: [PATCH v6 3/5] memory: mediatek: Add SMI driver Date: Tue, 8 Dec 2015 17:49:11 +0800 Message-ID: <1449568153-15643-4-git-send-email-yong.wu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1449568153-15643-1-git-send-email-yong.wu@mediatek.com> References: <1449568153-15643-1-git-send-email-yong.wu@mediatek.com> MIME-Version: 1.0 Content-Type: text/plain X-MTK: N Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 11364 Lines: 423 This patch add SMI(Smart Multimedia Interface) driver. This driver is responsible to enable/disable iommu and control the power domain and clocks of each local arbiter. Signed-off-by: Yong Wu --- Currently SMI offer mtk_smi_larb_get/put to enable the power-domain ,clocks and initialize the iommu configuration register for each a local arbiter, The reason is: a) If a device would like to disable iommu, it also need call mtk_smi_larb_get/put to enable its power and clocks. b) The iommu core don't support attach/detach a device within a iommu-group. So we cann't use iommu_attach_device(iommu_detach_device) instead of mtk_smi_larb_get/put. drivers/memory/Kconfig | 8 ++ drivers/memory/Makefile | 1 + drivers/memory/mtk-smi.c | 297 +++++++++++++++++++++++++++++++++++++++++++++ include/soc/mediatek/smi.h | 53 ++++++++ 4 files changed, 359 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 6f31546..51d5cd2 100644 --- a/drivers/memory/Kconfig +++ b/drivers/memory/Kconfig @@ -114,6 +114,14 @@ 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 power domain and + clocks for each local arbiter. + source "drivers/memory/tegra/Kconfig" endif diff --git a/drivers/memory/Makefile b/drivers/memory/Makefile index 1c46af5..890bdf4 100644 --- a/drivers/memory/Makefile +++ b/drivers/memory/Makefile @@ -15,5 +15,6 @@ 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..3562081 --- /dev/null +++ b/drivers/memory/mtk-smi.c @@ -0,0 +1,297 @@ +/* + * Copyright (c) 2014-2015 MediaTek Inc. + * Author: Yong Wu + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include + +#define SMI_LARB_MMU_EN 0xf00 +#define F_SMI_MMU_EN(port) BIT(port) + +struct mtk_smi_common { + struct device *dev; + struct clk *clk_apb, *clk_smi; +}; + +struct mtk_smi_larb { /* larb: local arbiter */ + struct device *dev; + void __iomem *base; + struct clk *clk_apb, *clk_smi; + struct device *smi_common_dev; + u32 mmu; +}; + +static int +mtk_smi_enable(struct device *dev, struct clk *apb, struct clk *smi) +{ + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) + return ret; + + ret = clk_prepare_enable(apb); + if (ret) + goto err_put_pm; + + ret = clk_prepare_enable(smi); + if (ret) + goto err_disable_apb; + + return 0; + +err_disable_apb: + clk_disable_unprepare(apb); +err_put_pm: + pm_runtime_put_sync(dev); + return ret; +} + +static void +mtk_smi_disable(struct device *dev, struct clk *apb, struct clk *smi) +{ + clk_disable_unprepare(smi); + clk_disable_unprepare(apb); + pm_runtime_put_sync(dev); +} + +static int mtk_smi_common_enable(struct mtk_smi_common *common) +{ + return mtk_smi_enable(common->dev, common->clk_apb, common->clk_smi); +} + +static void mtk_smi_common_disable(struct mtk_smi_common *common) +{ + mtk_smi_disable(common->dev, common->clk_apb, common->clk_smi); +} + +static int mtk_smi_larb_enable(struct mtk_smi_larb *larb) +{ + return mtk_smi_enable(larb->dev, larb->clk_apb, larb->clk_smi); +} + +static void mtk_smi_larb_disable(struct mtk_smi_larb *larb) +{ + mtk_smi_disable(larb->dev, larb->clk_apb, larb->clk_smi); +} + +int mtk_smi_larb_get(struct device *larbdev) +{ + struct mtk_smi_larb *larb = dev_get_drvdata(larbdev); + struct mtk_smi_common *common = dev_get_drvdata(larb->smi_common_dev); + int ret; + + ret = mtk_smi_common_enable(common); + if (ret) + return ret; + + ret = mtk_smi_larb_enable(larb); + if (ret) + goto err_put_smi; + + /* Configure the iommu info */ + writel_relaxed(larb->mmu, larb->base + SMI_LARB_MMU_EN); + + return 0; + +err_put_smi: + mtk_smi_common_disable(common); + return ret; +} + +void mtk_smi_larb_put(struct device *larbdev) +{ + struct mtk_smi_larb *larb = dev_get_drvdata(larbdev); + struct mtk_smi_common *common = dev_get_drvdata(larb->smi_common_dev); + + writel_relaxed(0, larb->base + SMI_LARB_MMU_EN); + mtk_smi_larb_disable(larb); + mtk_smi_common_disable(common); +} + +void mtk_smi_config_port(struct device *larbdev, unsigned int larbportid, + bool enable) +{ + struct mtk_smi_larb *larb = dev_get_drvdata(larbdev); + + dev_dbg(larbdev, "%s iommu port: %d\n", + enable ? "enable" : "disable", larbportid); + + /* + * Only record the iommu info here, + * and it will work after its power and clocks is enabled. + */ + if (enable) + larb->mmu |= F_SMI_MMU_EN(larbportid); + else + larb->mmu &= ~F_SMI_MMU_EN(larbportid); +} + +static int +mtk_smi_larb_bind(struct device *dev, struct device *master, void *data) +{ + return 0; +} + +static void +mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data) +{ +} + +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; + larb->dev = dev; + + 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->clk_apb = devm_clk_get(dev, "apb"); + if (IS_ERR(larb->clk_apb)) + return PTR_ERR(larb->clk_apb); + + larb->clk_smi = devm_clk_get(dev, "smi"); + if (IS_ERR(larb->clk_smi)) + return PTR_ERR(larb->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) { + 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); + dev_set_drvdata(dev, 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 *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); + dev_set_drvdata(dev, 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); diff --git a/include/soc/mediatek/smi.h b/include/soc/mediatek/smi.h new file mode 100644 index 0000000..6f41b2e --- /dev/null +++ b/include/soc/mediatek/smi.h @@ -0,0 +1,53 @@ +/* + * Copyright (c) 2014-2015 MediaTek Inc. + * Author: Yong Wu + * + * 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 + +#ifdef CONFIG_MTK_SMI + +/* + * Record the iommu info for each port in the local arbiter. + * It's only for iommu. + */ +void mtk_smi_config_port(struct device *larbdev, unsigned int larbportid, + bool enable); +/* + * mtk_smi_larb_get: Enable the power domain and clocks for this local arbiter. + * It also initialize some basic setting(like iommu). + * mtk_smi_larb_put: Disable the power domain and clocks for this local arbiter. + * Both should be called in non-atomic context. + * + * Returns 0 if successful, negative on failure. + */ +int mtk_smi_larb_get(struct device *larbdev); +void mtk_smi_larb_put(struct device *larbdev); + +#else + +static inline void +mtk_smi_config_port(struct device *larbdev, unsigned int larbportid, + bool enable) { } + +static inline int mtk_smi_larb_get(struct device *larbdev) +{ + return 0; +} + +static inline void mtk_smi_larb_put(struct device *larbdev) { } + +#endif + +#endif -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/