Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751365Ab3HTJ52 (ORCPT ); Tue, 20 Aug 2013 05:57:28 -0400 Received: from ns.mm-sol.com ([212.124.72.66]:56826 "EHLO extserv.mm-sol.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750858Ab3HTJ5X (ORCPT ); Tue, 20 Aug 2013 05:57:23 -0400 From: "Ivan T. Ivanov" To: balbi@ti.com Cc: rob.herring@calxeda.com, pawel.moll@arm.com, mark.rutland@arm.com, swarren@wwwdotorg.org, ian.campbell@citrix.com, rob@landley.net, gregkh@linuxfoundation.org, grant.likely@linaro.org, idos@codeaurora.org, mgautam@codeaurora.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, linux-arm-msm@vger.kernel.org, "Ivan T. Ivanov" Subject: [PATCH v4 3/3] usb: dwc3: Add Qualcomm DWC3 glue layer driver Date: Tue, 20 Aug 2013 12:56:05 +0300 Message-Id: <1376992565-22292-4-git-send-email-iivanov@mm-sol.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1376992565-22292-1-git-send-email-iivanov@mm-sol.com> References: <1376992565-22292-1-git-send-email-iivanov@mm-sol.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6415 Lines: 223 From: "Ivan T. Ivanov" DWC3 glue layer is hardware layer around Synopsys DesignWare USB3 core. Its purpose is to supply Synopsys IP with required clocks, voltages and interface it with the rest of the SoC. Signed-off-by: Ivan T. Ivanov --- drivers/usb/dwc3/Kconfig | 8 +++ drivers/usb/dwc3/Makefile | 1 + drivers/usb/dwc3/dwc3-msm.c | 167 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 176 insertions(+) create mode 100644 drivers/usb/dwc3/dwc3-msm.c diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig index f969ea2..d845966 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -71,6 +71,14 @@ config USB_DWC3_PCI One such PCIe-based platform is Synopsys' PCIe HAPS model of this IP. +config USB_DWC3_MSM + tristate "Qualcomm MSM/APQ Platforms" + default USB_DWC3 + select USB_MSM_DWC3_PHYS + help + Recent Qualcomm SoCs ship with one DesignWare Core USB3 IP inside, + say 'Y' or 'M' if you have one such device. + comment "Debugging features" config USB_DWC3_DEBUG diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile index dd17601..5226681 100644 --- a/drivers/usb/dwc3/Makefile +++ b/drivers/usb/dwc3/Makefile @@ -32,3 +32,4 @@ endif obj-$(CONFIG_USB_DWC3_OMAP) += dwc3-omap.o obj-$(CONFIG_USB_DWC3_EXYNOS) += dwc3-exynos.o obj-$(CONFIG_USB_DWC3_PCI) += dwc3-pci.o +obj-$(CONFIG_USB_DWC3_MSM) += dwc3-msm.o diff --git a/drivers/usb/dwc3/dwc3-msm.c b/drivers/usb/dwc3/dwc3-msm.c new file mode 100644 index 0000000..361076c --- /dev/null +++ b/drivers/usb/dwc3/dwc3-msm.c @@ -0,0 +1,167 @@ +/* Copyright (c) 2013, The Linux Foundation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only 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 + +struct dwc3_msm { + struct device *dev; + + struct clk *core_clk; + struct clk *iface_clk; + struct clk *sleep_clk; + struct clk *utmi_clk; + + struct regulator *gdsc; +}; + +static int dwc3_msm_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct dwc3_msm *mdwc; + struct resource *res; + void __iomem *tcsr; + int ret = 0; + + mdwc = devm_kzalloc(&pdev->dev, sizeof(*mdwc), GFP_KERNEL); + if (!mdwc) + return -ENOMEM; + + platform_set_drvdata(pdev, mdwc); + mdwc->dev = &pdev->dev; + + mdwc->gdsc = devm_regulator_get(mdwc->dev, "gdsc"); + + mdwc->core_clk = devm_clk_get(&pdev->dev, "core"); + if (IS_ERR(mdwc->core_clk)) { + dev_dbg(&pdev->dev, "failed to get core clock\n"); + return PTR_ERR(mdwc->core_clk); + } + + mdwc->iface_clk = devm_clk_get(&pdev->dev, "iface"); + if (IS_ERR(mdwc->iface_clk)) { + dev_dbg(&pdev->dev, "failed to get iface clock\n"); + return PTR_ERR(mdwc->iface_clk); + } + + mdwc->sleep_clk = devm_clk_get(&pdev->dev, "sleep "); + if (IS_ERR(mdwc->sleep_clk)) { + dev_dbg(&pdev->dev, "failed to get sleep clock\n"); + return PTR_ERR(mdwc->sleep_clk); + } + + mdwc->utmi_clk = devm_clk_get(&pdev->dev, "utmi"); + if (IS_ERR(mdwc->utmi_clk)) { + dev_dbg(&pdev->dev, "failed to get utmi clock\n"); + return PTR_ERR(mdwc->utmi_clk); + } + + if (!IS_ERR(mdwc->gdsc)) { + ret = regulator_enable(mdwc->gdsc); + if (ret) + dev_err(mdwc->dev, "cannot enable usb3 gdsc\n"); + } + + /* + * DWC3 Core requires its CORE CLK (aka master / bus clk) to + * run at 125Mhz in SSUSB mode and >60MHZ for HSUSB mode. + */ + clk_set_rate(mdwc->core_clk, 125000000); + clk_prepare_enable(mdwc->core_clk); + clk_prepare_enable(mdwc->iface_clk); + clk_prepare_enable(mdwc->sleep_clk); + clk_prepare_enable(mdwc->utmi_clk); + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tcsr = devm_ioremap_resource(&pdev->dev, res); + if (!tcsr) { + ret = PTR_ERR(tcsr); + goto dis_clks; + } + + /* + * Primary USB port is shared between USB2 and USB3 controllers. + * By default this port is routed to USB2. Select primary port for + * USB3, this will automatically move USB2 to secondary port. + */ + writel(0x1, tcsr); + + ret = of_platform_populate(node, NULL, NULL, &pdev->dev); + if (ret) { + dev_dbg(&pdev->dev, "failed to add create dwc3 core\n"); + writel(0x0, tcsr); + goto dis_clks; + } + + return 0; + +dis_clks: + clk_disable_unprepare(mdwc->utmi_clk); + clk_disable_unprepare(mdwc->sleep_clk); + clk_disable_unprepare(mdwc->iface_clk); + clk_disable_unprepare(mdwc->core_clk); + if (!IS_ERR(mdwc->gdsc)) { + ret = regulator_disable(mdwc->gdsc); + if (ret) + dev_dbg(mdwc->dev, "cannot disable usb3 gdsc\n"); + } + + return ret; +} + +static int dwc3_msm_remove(struct platform_device *pdev) +{ + struct dwc3_msm *mdwc = platform_get_drvdata(pdev); + int ret; + + clk_disable_unprepare(mdwc->utmi_clk); + clk_disable_unprepare(mdwc->sleep_clk); + clk_disable_unprepare(mdwc->iface_clk); + clk_disable_unprepare(mdwc->core_clk); + + if (!IS_ERR(mdwc->gdsc)) { + ret = regulator_disable(mdwc->gdsc); + if (ret) + dev_dbg(mdwc->dev, "cannot disable usb3 gdsc\n"); + } + + return 0; +} + +static const struct of_device_id of_dwc3_match[] = { + { .compatible = "qcom,dwc3" }, + { /* Sentinel */ } +}; +MODULE_DEVICE_TABLE(of, of_dwc3_match); + +static struct platform_driver dwc3_msm_driver = { + .probe = dwc3_msm_probe, + .remove = dwc3_msm_remove, + .driver = { + .name = "msm-dwc3", + .owner = THIS_MODULE, + .of_match_table = of_dwc3_match, + }, +}; + +module_platform_driver(dwc3_msm_driver); + +MODULE_ALIAS("platform:msm_dwc3"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("DesignWare USB3 MSM Glue Layer"); -- 1.7.9.5 -- 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/