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Tue, 9 Jun 2020 11:23:41 +0000 From: Li Jun To: balbi@kernel.org, shawnguo@kernel.org Cc: gregkh@linuxfoundation.org, robh+dt@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peter.chen@nxp.com Subject: [PATCH 3/6] usb: dwc3: add imx8mp dwc3 glue layer driver Date: Tue, 9 Jun 2020 19:12:42 +0800 Message-Id: <1591701165-12872-4-git-send-email-jun.li@nxp.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1591701165-12872-1-git-send-email-jun.li@nxp.com> References: <1591701165-12872-1-git-send-email-jun.li@nxp.com> X-ClientProxiedBy: SG2PR02CA0069.apcprd02.prod.outlook.com (2603:1096:4:54::33) To VE1PR04MB6528.eurprd04.prod.outlook.com (2603:10a6:803:127::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.localdomain (119.31.174.66) by SG2PR02CA0069.apcprd02.prod.outlook.com (2603:1096:4:54::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256) id 15.20.3066.18 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: Oe2lld5WTWDUPVGgnUl9dzqHJiJIe08+M2YG88J6wh233BIF/+iMr6WYX8w3p8IpOvjf0PxRtkb6wkYcGqmUVPsEKdwhoZZrsqxxvHysI+38c1W/xico93AUrNj//xA1RUYLsp9GAS02TlOH5kHXAUU8tNmajshVcMBQ8aLzbalbzhU67Z2cZECCW7THV/43yU3OHK/2FVOtX9mwua6BzcGTdcJllZd5q5SdwG2p9LVJOAlznC5fcveO3p9GHdG9JZctBw/GVd8ugr8Ka8uxV3Rpc/+rk9ZQrbYFyEASCFcMU7agp2gafUk4kNPXXdZ3HoKu0jgH/+UPxKnqw6mmx5c08Izfk1G/H/WkjRCOCa4LXG+dkpcG0XI8JLPleNOTzoHfr8kFAFYZGkl8oFNiYxzJOGLvoqfW5aCKTHJEdvawkd8XugEVHY+lbjnbpZ2IHa53isvi9H48jkrX7brZc02dnZo9OAFQ+0LrVS2Bq+c= X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-Network-Message-Id: 86846476-5e28-4f17-6ad5-08d80c679008 X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jun 2020 11:23:41.6917 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: nZZBXWXPQjjAUuZsLXXVulMwEkeubzYZd4mUvmoibVxyJq+TQsDlaltro2YjaiKw X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR04MB6589 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org imx8mp SoC integrate dwc3 3.30b IP and has some customizations to support low power, which has a seprated wakeup irq and additional logic to wakeup usb from low power mode both for host mode and device mode. Signed-off-by: Li Jun --- drivers/usb/dwc3/Kconfig | 10 ++ drivers/usb/dwc3/Makefile | 1 + drivers/usb/dwc3/dwc3-imx8mp.c | 352 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 363 insertions(+) diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig index 206caa0..7ef2339 100644 --- a/drivers/usb/dwc3/Kconfig +++ b/drivers/usb/dwc3/Kconfig @@ -138,4 +138,14 @@ config USB_DWC3_QCOM for peripheral mode support. Say 'Y' or 'M' if you have one such device. +config USB_DWC3_IMX8MP + tristate "NXP iMX8MP Platform" + depends on OF && COMMON_CLK + depends on (ARCH_MXC && ARM64) || COMPILE_TEST + default USB_DWC3 + help + NXP iMX8M Plus SoC use DesignWare Core IP for USB2/3 + functionality. + Say 'Y' or 'M' if you have one such device. + endif diff --git a/drivers/usb/dwc3/Makefile b/drivers/usb/dwc3/Makefile index ae86da0..2259f88 100644 --- a/drivers/usb/dwc3/Makefile +++ b/drivers/usb/dwc3/Makefile @@ -51,3 +51,4 @@ obj-$(CONFIG_USB_DWC3_MESON_G12A) += dwc3-meson-g12a.o obj-$(CONFIG_USB_DWC3_OF_SIMPLE) += dwc3-of-simple.o obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o obj-$(CONFIG_USB_DWC3_QCOM) += dwc3-qcom.o +obj-$(CONFIG_USB_DWC3_IMX8MP) += dwc3-imx8mp.o diff --git a/drivers/usb/dwc3/dwc3-imx8mp.c b/drivers/usb/dwc3/dwc3-imx8mp.c new file mode 100644 index 0000000..d4e9e99 --- /dev/null +++ b/drivers/usb/dwc3/dwc3-imx8mp.c @@ -0,0 +1,352 @@ +// SPDX-License-Identifier: GPL-2.0 +/** + * dwc3-imx8mp.c - NXP imx8mp Specific Glue layer + * + * Copyright (c) 2020 NXP. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "core.h" + +/* USB wakeup registers */ +#define USB_WAKEUP_CTRL 0x00 + +/* Global wakeup interrupt enable, also used to clear interrupt */ +#define USB_WAKEUP_EN BIT(31) +/* Wakeup from connect or disconnect, only for superspeed */ +#define USB_WAKEUP_SS_CONN BIT(5) +/* 0 select vbus_valid, 1 select sessvld */ +#define USB_WAKEUP_VBUS_SRC_SESS_VAL BIT(4) +/* Enable signal for wake up from u3 state */ +#define USB_WAKEUP_U3_EN BIT(3) +/* Enable signal for wake up from id change */ +#define USB_WAKEUP_ID_EN BIT(2) +/* Enable signal for wake up from vbus change */ +#define USB_WAKEUP_VBUS_EN BIT(1) +/* Enable signal for wake up from dp/dm change */ +#define USB_WAKEUP_DPDM_EN BIT(0) + +#define USB_WAKEUP_EN_MASK GENMASK(5, 0) + +struct dwc3_imx8mp { + struct device *dev; + struct platform_device *dwc3; + void __iomem *glue_base; + struct clk_bulk_data *clks; + int num_clks; + int irq; + bool pm_suspended; + bool wakeup_pending; +}; + +static const struct clk_bulk_data dwc3_imx8mp_clks[] = { + { .id = "hsio" }, + { .id = "bus" }, + { .id = "suspend" }, +}; + +static void dwc3_imx8mp_wakeup_enable(struct dwc3_imx8mp *dwc3_imx) +{ + struct dwc3 *dwc3 = platform_get_drvdata(dwc3_imx->dwc3); + u32 val; + + if (!dwc3) + return; + + val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); + + if ((dwc3->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc3->xhci) + val |= USB_WAKEUP_EN | USB_WAKEUP_SS_CONN | + USB_WAKEUP_U3_EN | USB_WAKEUP_DPDM_EN; + else if (dwc3->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) + val |= USB_WAKEUP_EN | USB_WAKEUP_VBUS_EN | + USB_WAKEUP_VBUS_SRC_SESS_VAL; + + writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); +} + +static void dwc3_imx8mp_wakeup_disable(struct dwc3_imx8mp *dwc3_imx) +{ + u32 val; + + val = readl(dwc3_imx->glue_base + USB_WAKEUP_CTRL); + val &= ~(USB_WAKEUP_EN | USB_WAKEUP_EN_MASK); + writel(val, dwc3_imx->glue_base + USB_WAKEUP_CTRL); +} + +static irqreturn_t dwc3_imx8mp_interrupt(int irq, void *_dwc3_imx) +{ + struct dwc3_imx8mp *dwc3_imx = _dwc3_imx; + struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); + + if (!dwc3_imx->pm_suspended) + return IRQ_HANDLED; + + disable_irq_nosync(dwc3_imx->irq); + dwc3_imx->wakeup_pending = true; + + if ((dwc->current_dr_role == DWC3_GCTL_PRTCAP_HOST) && dwc->xhci) + pm_runtime_resume(&dwc->xhci->dev); + else if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) + pm_runtime_get(dwc->dev); + + return IRQ_HANDLED; +} + +static int dwc3_imx8mp_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct device_node *dwc3_np, *node = dev->of_node; + struct dwc3_imx8mp *dwc3_imx; + int err, irq; + + if (!node) { + dev_err(dev, "device node not found\n"); + return -EINVAL; + } + + dwc3_imx = devm_kzalloc(dev, sizeof(*dwc3_imx), GFP_KERNEL); + if (!dwc3_imx) + return -ENOMEM; + + platform_set_drvdata(pdev, dwc3_imx); + + dwc3_imx->dev = dev; + + dwc3_imx->glue_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(dwc3_imx->glue_base)) + return PTR_ERR(dwc3_imx->glue_base); + + dwc3_imx->clks = devm_kmemdup(dev, dwc3_imx8mp_clks, + sizeof(dwc3_imx8mp_clks), GFP_KERNEL); + if (!dwc3_imx->clks) + return -ENOMEM; + + dwc3_imx->num_clks = ARRAY_SIZE(dwc3_imx8mp_clks); + err = devm_clk_bulk_get(dev, dwc3_imx->num_clks, dwc3_imx->clks); + if (err) { + dev_err(dev, "Failed to request all necessary clocks\n"); + return err; + } + + err = clk_bulk_prepare_enable(dwc3_imx->num_clks, dwc3_imx->clks); + if (err) + return err; + + /* Double enable suspend clk to keep it always on */ + err = clk_prepare_enable(dwc3_imx->clks[dwc3_imx->num_clks-1].clk); + if (err) + goto disable_bulk_clk; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) { + err = irq; + goto disable_clks; + } + dwc3_imx->irq = irq; + + err = devm_request_threaded_irq(dev, irq, NULL, dwc3_imx8mp_interrupt, + IRQF_ONESHOT, dev_name(dev), dwc3_imx); + if (err) { + dev_err(dev, "failed to request IRQ #%d --> %d\n", irq, err); + goto disable_clks; + } + + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + err = pm_runtime_get_sync(dev); + if (err < 0) + goto disable_rpm; + + dwc3_np = of_get_child_by_name(node, "dwc3"); + if (!dwc3_np) { + dev_err(dev, "failed to find dwc3 core child\n"); + goto disable_rpm; + } + + err = of_platform_populate(node, NULL, NULL, dev); + if (err) { + dev_err(&pdev->dev, "failed to create dwc3 core\n"); + goto disable_rpm; + } + + dwc3_imx->dwc3 = of_find_device_by_node(dwc3_np); + if (!dwc3_imx->dwc3) { + dev_err(dev, "failed to get dwc3 platform device\n"); + err = -ENODEV; + goto depopulate; + } + + device_set_wakeup_capable(dev, true); + pm_runtime_put(dev); + + return 0; + +depopulate: + of_platform_depopulate(dev); +disable_rpm: + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); +disable_clks: + clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk); +disable_bulk_clk: + clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks); + + return err; +} + +static int dwc3_imx8mp_remove(struct platform_device *pdev) +{ + struct dwc3_imx8mp *dwc3_imx = platform_get_drvdata(pdev); + struct device *dev = &pdev->dev; + + pm_runtime_get_sync(dev); + of_platform_depopulate(dev); + + clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks); + clk_disable_unprepare(dwc3_imx->clks[dwc3_imx->num_clks-1].clk); + + pm_runtime_disable(dev); + pm_runtime_put_noidle(dev); + platform_set_drvdata(pdev, NULL); + + return 0; +} + +static int dwc3_imx8mp_suspend(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg) +{ + if (dwc3_imx->pm_suspended) + return 0; + + /* Wakeup enable */ + if (PMSG_IS_AUTO(msg) || device_may_wakeup(dwc3_imx->dev)) + dwc3_imx8mp_wakeup_enable(dwc3_imx); + + clk_bulk_disable_unprepare(dwc3_imx->num_clks, dwc3_imx->clks); + dwc3_imx->pm_suspended = true; + + return 0; +} + +static int dwc3_imx8mp_resume(struct dwc3_imx8mp *dwc3_imx, pm_message_t msg) +{ + struct dwc3 *dwc = platform_get_drvdata(dwc3_imx->dwc3); + int ret = 0; + + if (!dwc3_imx->pm_suspended) + return 0; + + ret = clk_bulk_prepare_enable(dwc3_imx->num_clks, dwc3_imx->clks); + if (ret) + return ret; + + /* Wakeup disable */ + dwc3_imx8mp_wakeup_disable(dwc3_imx); + dwc3_imx->pm_suspended = false; + + if (dwc3_imx->wakeup_pending) { + dwc3_imx->wakeup_pending = false; + if (dwc->current_dr_role == DWC3_GCTL_PRTCAP_DEVICE) { + pm_runtime_mark_last_busy(dwc->dev); + pm_runtime_put_autosuspend(dwc->dev); + } else { + /* + * Add wait for xhci switch from suspend + * clock to normal clock to detect connection. + */ + usleep_range(9000, 10000); + } + enable_irq(dwc3_imx->irq); + } + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_pm_suspend(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + int ret; + + ret = dwc3_imx8mp_suspend(dwc3_imx, PMSG_SUSPEND); + + if (device_may_wakeup(dwc3_imx->dev)) + enable_irq_wake(dwc3_imx->irq); + + dev_dbg(dev, "dwc3 imx8mp pm suspend.\n"); + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_pm_resume(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + int ret; + + if (device_may_wakeup(dwc3_imx->dev)) + disable_irq_wake(dwc3_imx->irq); + + ret = dwc3_imx8mp_resume(dwc3_imx, PMSG_RESUME); + + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + + dev_dbg(dev, "dwc3 imx8mp pm resume.\n"); + + return ret; +} + +static int __maybe_unused dwc3_imx8mp_runtime_suspend(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + + dev_dbg(dev, "dwc3 imx8mp runtime suspend.\n"); + + return dwc3_imx8mp_suspend(dwc3_imx, PMSG_AUTO_SUSPEND); +} + +static int __maybe_unused dwc3_imx8mp_runtime_resume(struct device *dev) +{ + struct dwc3_imx8mp *dwc3_imx = dev_get_drvdata(dev); + + dev_dbg(dev, "dwc3 imx8mp runtime resume.\n"); + + return dwc3_imx8mp_resume(dwc3_imx, PMSG_AUTO_RESUME); +} + +static const struct dev_pm_ops dwc3_imx8mp_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(dwc3_imx8mp_pm_suspend, dwc3_imx8mp_pm_resume) + SET_RUNTIME_PM_OPS(dwc3_imx8mp_runtime_suspend, + dwc3_imx8mp_runtime_resume, NULL) +}; + +static const struct of_device_id dwc3_imx8mp_of_match[] = { + { .compatible = "fsl,imx8mp-dwc3", }, + {}, +}; +MODULE_DEVICE_TABLE(of, dwc3_imx8mp_of_match); + +static struct platform_driver dwc3_imx8mp_driver = { + .probe = dwc3_imx8mp_probe, + .remove = dwc3_imx8mp_remove, + .driver = { + .name = "imx8mp-dwc3", + .pm = &dwc3_imx8mp_dev_pm_ops, + .of_match_table = dwc3_imx8mp_of_match, + }, +}; + +module_platform_driver(dwc3_imx8mp_driver); + +MODULE_ALIAS("platform:imx8mp-dwc3"); +MODULE_AUTHOR("jun.li@nxp.com"); +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("DesignWare USB3 imx8mp Glue Layer");