Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754879AbbEOJoT (ORCPT ); Fri, 15 May 2015 05:44:19 -0400 Received: from mailgw02.mediatek.com ([210.61.82.184]:51656 "EHLO mailgw02.mediatek.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1754842AbbEOJoN (ORCPT ); Fri, 15 May 2015 05:44:13 -0400 X-Listener-Flag: 11101 From: Yong Wu To: Rob Herring , Joerg Roedel , Matthias Brugger CC: Robin Murphy , Will Deacon , Daniel Kurtz , Tomasz Figa , Lucas Stach , Mark Rutland , Catalin Marinas , , Sasha Hauer , , , , , , , , , , , Yong Wu Subject: [PATCH v2 4/6] soc: mediatek: Add SMI driver Date: Fri, 15 May 2015 17:43:27 +0800 Message-ID: <1431683009-18158-5-git-send-email-yong.wu@mediatek.com> X-Mailer: git-send-email 1.8.1.1.dirty In-Reply-To: <1431683009-18158-1-git-send-email-yong.wu@mediatek.com> References: <1431683009-18158-1-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: 10232 Lines: 392 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 --- 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 + * + * 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 +#include + +#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 + * + * 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 + +/* + * 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 -- 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/