From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753399AbaGGNWN (ORCPT ); Mon, 7 Jul 2014 09:22:13 -0400 Received: from mailout1.samsung.com ([203.254.224.24]:59247 "EHLO mailout1.samsung.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752933AbaGGNWJ (ORCPT ); Mon, 7 Jul 2014 09:22:09 -0400 X-AuditID: cbfee68f-b7fef6d000003970-e0-53ba9edffbb0 From: Jingoo Han To: "'Peter Griffin'" Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "'Maxime Coquelin'" , "'Patrice Chotard'" , "'Srinivas Kandagatla'" , devicetree@vger.kernel.org, "'Felipe Balbi'" , linux-usb@vger.kernel.org, linux-omap@vger.kernel.org, "'Lee Jones'" , "'Giuseppe Cavallaro'" , "'Jingoo Han'" References: <1404541530-27856-1-git-send-email-peter.griffin@linaro.org> <1404541530-27856-2-git-send-email-peter.griffin@linaro.org> In-reply-to: <1404541530-27856-2-git-send-email-peter.griffin@linaro.org> Subject: Re: [PATCH v2 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC Date: Mon, 07 Jul 2014 22:21:34 +0900 Message-id: <000d01cf99e6$602096b0$2061c410$%han@samsung.com> MIME-version: 1.0 Content-type: text/plain; charset=us-ascii Content-transfer-encoding: 7bit X-Mailer: Microsoft Office Outlook 12.0 Thread-index: Ac+YGjhok2ogFy92Q/+oCKy5F6f8nwByTakg Content-language: ko X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFuphleLIzCtJLcpLzFFi42I5/e+Zoe79ebuCDb4f1bY4eL/e4uUhTYv5 R86xWlxeeInV4v7Xo4wWmx5fA3J3zWGzmL2kn8Vi0bJWZotHpxezWcw5cZXR4v/rrYwWG2b8 Y7Fo+xbnwOexc9Zddo871/aweWxeUu/Rt2UVo8fTH3uZPY7f2M7k8XmTXAB7FJdNSmpOZllq kb5dAlfG5SsvGQuep1Q0XjjD3sD4J7CLkZNDQsBEore1gRnCFpO4cG89WxcjF4eQwDJGiWuz zzHDFJ0/uYkZIjGdUeL6sy0sEM5vRonWrmZ2kCo2ATWJL18Og9kiAnoSj9cuBhvFLHCOWeLl 3olQ7e2MEjf71jCCVHEKeEpcXL2FtYuRg0NYwF9i1WIvkDCLgKrEhld/wFbzCthKTPjeCGUL SvyYfI8FxGYW0JJYv/M4E4QtL7F5zVtmkDESAuoSj/7qQtxgJNG/YC8bRImIxL4X7xhBTpAQ WMkhsX5WGzPELgGJb5MPsUD0ykpsOgD1saTEwRU3WCYwSsxCsnkWks2zkGyehWTFAkaWVYyi qQXJBcVJ6UXGesWJucWleel6yfm5mxghKaF/B+PdA9aHGJOB1k9klhJNzgemlLySeENjMyML UxNTYyNzSzPShJXEee8/TAoSEkhPLEnNTk0tSC2KLyrNSS0+xMjEwSnVwKhyJZ3bsD5I19Xn HOOkSJY508LW+hSu2HpLZEvYNpUwSQYZvtfiUo+fPNG4c/rRZZGYfTNndMvmnpob/rTg8uvc bZ0LQmQ83bzCa57zxtT0mj07eEdu/rIrzadkDpnscWa0Z86zM5Y25VIUXfb9YrP4k9LvNy5+ iNrvZGj7OLSmJcPl5vkn4kosxRmJhlrMRcWJAN7mMrwfAwAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrNKsWRmVeSWpSXmKPExsVy+t9jQd3783YFG1x6pWJx8H69xctDmhbz j5xjtbi88BKrxf2vRxktNj2+BuTumsNmMXtJP4vFomWtzBaPTi9ms5hz4iqjxf/XWxktNsz4 x2LR9i3Ogc9j56y77B53ru1h89i8pN6jb8sqRo+nP/Yyexy/sZ3J4/MmuQD2qAZGm4zUxJTU IoXUvOT8lMy8dFsl7+B453hTMwNDXUNLC3MlhbzE3FRbJRefAF23zBygg5UUyhJzSoFCAYnF xUr6dpgmhIa46VrANEbo+oYEwfUYGaCBhHWMGZevvGQseJ5S0XjhDHsD45/ALkZODgkBE4nz JzcxQ9hiEhfurWfrYuTiEBKYzihx/dkWFgjnN6NEa1czO0gVm4CaxJcvh8FsEQE9icdrF4N1 MAucY5Z4uXciM0RHO6PEzb41jCBVnAKeEhdXb2HtYuTgEBbwl1i12AskzCKgKrHh1R+w1bwC thITvjdC2YISPybfYwGxmQW0JNbvPM4EYctLbF7zlhlkjISAusSjv7oQNxhJ9C/YywZRIiKx 78U7xgmMQrOQTJqFZNIsJJNmIWlZwMiyilE0tSC5oDgpPddIrzgxt7g0L10vOT93EyM44TyT 3sG4qsHiEKMAB6MSD++BVTuDhVgTy4orcw8xSnAwK4nwTo/fFSzEm5JYWZValB9fVJqTWnyI 0RTo0YnMUqLJ+cBkmFcSb2hsYmZkaWRmYWRibq4kznuw1TpQSCA9sSQ1OzW1ILUIpo+Jg1Oq gbFwx/KlSqtVDc2fnQh3ZZ0x1VNrTianrmPSTrkXTRYLVygI3WEru/ZAXTbvXaf5bhFL+/gF 9aF2R0MKJ12pnrBmQWiqiSjz3llXbA6+e2lTNGPWGu60xE+n85IOFW4M32Rz0etQMV+SqYF/ 7gNXodcnFVflNvrNe9f48PC7VQrzlrpLXHogzaXEUpyRaKjFXFScCAAzjBjkTgMAAA== DLP-Filter: Pass X-MTR: 20000000000000000@CPGS X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Saturday, July 05, 2014 3:25 PM, Peter Griffin wrote: > > This patch adds the ST glue logic to manage the DWC3 HC > on STiH407 SoC family. It manages the powerdown signal, > and configures the internal glue logic and syscfg registers. > > Signed-off-by: Giuseppe Cavallaro > Signed-off-by: Peter Griffin > --- > drivers/usb/dwc3/Kconfig | 9 ++ > drivers/usb/dwc3/Makefile | 1 + > drivers/usb/dwc3/dwc3-st.c | 325 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 335 insertions(+) > create mode 100644 drivers/usb/dwc3/dwc3-st.c > > diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig > index 8eb996e..6c85c43 100644 > --- a/drivers/usb/dwc3/Kconfig > +++ b/drivers/usb/dwc3/Kconfig > @@ -79,6 +79,15 @@ config USB_DWC3_KEYSTONE > Support of USB2/3 functionality in TI Keystone2 platforms. > Say 'Y' or 'M' here if you have one such device > > +config USB_DWC3_ST > + tristate "STMicroelectronics Platforms" > + depends on ARCH_STI && OF > + default USB_DWC3_HOST > + help > + STMicroelectronics SoCs with one DesignWare Core USB3 IP > + inside (i.e. STiH407). > + 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 10ac3e7..11c9f54 100644 > --- a/drivers/usb/dwc3/Makefile > +++ b/drivers/usb/dwc3/Makefile > @@ -33,3 +33,4 @@ 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_KEYSTONE) += dwc3-keystone.o > +obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o > diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c > new file mode 100644 > index 0000000..2cae9d3 > --- /dev/null > +++ b/drivers/usb/dwc3/dwc3-st.c > @@ -0,0 +1,325 @@ > +/** > + * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms > + * > + * This is a small platform driver for the dwc3 to provide the glue logic > + * to configure the controller. Tested on STi platforms. > + * > + * Copyright (C) 2014 Stmicroelectronics > + * > + * Author: Giuseppe Cavallaro > + * Contributors: Aymen Bouattay > + * Peter Griffin > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * Inspired by dwc3-omap.c and dwc3-exynos.c. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Would you re-order these headers alphabetically? It enhances the readability. > + > +#include "core.h" > +#include "io.h" > + > +/* Reg glue registers */ > +#define USB2_CLKRST_CTRL 0x00 > +#define aux_clk_en(n) ((n)<<0) > +#define sw_pipew_reset_n(n) ((n)<<4) > +#define ext_cfg_reset_n(n) ((n)<<8) > +#define xhci_revision(n) ((n)<<12) > + > +#define USB2_VBUS_MNGMNT_SEL1 0x2C > +/* > + * 2'b00 : Override value from Reg 0x30 is selected > + * 2'b01 : utmiotg_vbusvalid from usb3_top top is selected > + * 2'b10 : pipew_powerpresent from PIPEW instance is selected > + * 2'b11 : value is 1'b0 > + */ > +#define SEL_OVERRIDE_VBUSVALID(n) ((n)<<0) > +#define SEL_OVERRIDE_POWERPRESENT(n) ((n)<<4) > +#define SEL_OVERRIDE_BVALID(n) ((n)<<8) > + > +#define USB2_VBUS_MNGMNT_VAL1 0x30 > +#define OVERRIDE_VBUSVALID_VAL (1 << 0) > +#define OVERRIDE_POWERPRESENT_VAL (1 << 4) > +#define OVERRIDE_BVALID_VAL (1 << 8) > + > +/* Static DRD configuration */ > +#define USB_HOST_DEFAULT_MASK 0xffe > +#define USB_SET_PORT_DEVICE 0x1 > + > +struct st_dwc3 { > + struct platform_device *dwc3; /* platform device pointer */ > + struct device *dev; /* device pointer */ > + void __iomem *glue_base; /* ioaddr for programming the glue */ > + struct regmap *regmap; /* regmap for getting syscfg */ > + int syscfg_reg_off; /* usb syscfg control offset */ > + bool drd_device_conf; /* DRD static host/device conf */ > + struct reset_control *rstc_pwrdn;/* Rst control for powerdown*/ > +}; > + > +static inline u32 st_dwc3_readl(void __iomem *base, u32 offset) > +{ > + return readl_relaxed(base + offset); > +} > + > +static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value) > +{ > + writel_relaxed(value, base + offset); > +} > + > +/** > + * st_dwc3_drd_init: program the port > + * @dwc3_data: driver private structure > + * Description: this function is to program the port as either host or device > + * according to the static configuration passed from devicetree. > + * OTG and dual role are not yet supported! > + */ > +static int st_dwc3_drd_init(struct st_dwc3 *dwc3_data) > +{ > + u32 val; > + > + regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val); > + > + if (dwc3_data->drd_device_conf) > + val |= USB_SET_PORT_DEVICE; > + else > + val &= USB_HOST_DEFAULT_MASK; > + > + return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val); > +} > + > +/** > + * st_dwc3_init: init the controller via glue logic > + * @dwc3_data: driver private structure > + */ > +static void st_dwc3_init(struct st_dwc3 *dwc3_data) > +{ > + u32 reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL); > + > + reg |= aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revision(1); > + reg &= ~sw_pipew_reset_n(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg); > + > + reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1); > + reg |= SEL_OVERRIDE_VBUSVALID(1) | SEL_OVERRIDE_POWERPRESENT(1) | > + SEL_OVERRIDE_BVALID(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg); > + udelay(100); > + > + reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL); > + reg |= sw_pipew_reset_n(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg); > +} > + > +static void st_dwc3_dt_get_pdata(struct platform_device *pdev, > + struct st_dwc3 *dwc3_data) > +{ > + struct device_node *np = pdev->dev.of_node; > + > + dwc3_data->drd_device_conf = > + of_property_read_bool(np, "st,dwc3-drd-device"); > +} > + > +/** > + * st_dwc3_probe: main probe function > + * @pdev: platform_device > + * Description: this is the probe function that gets all the resources to manage > + * the glue-logic, setup the controller and take out of powerdown. > + */ > +static int st_dwc3_probe(struct platform_device *pdev) > +{ > + struct platform_device *dwc3; > + struct st_dwc3 *dwc3_data; > + struct resource *res; > + struct device *dev = &pdev->dev; > + struct device_node *node = dev->of_node; > + struct regmap *regmap; > + int ret = 0; > + > + if (!node) { > + dev_err(dev, "device node not found\n"); > + return -EINVAL; > + } > + > + dwc3_data = devm_kzalloc(dev, sizeof(*dwc3_data), GFP_KERNEL); > + if (!dwc3_data) > + return -ENOMEM; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg-glue"); > + if (!res) > + return -ENXIO; > + > + dwc3_data->glue_base = devm_request_and_ioremap(dev, res); Please don't use devm_request_and_ioremap() any more. It was deprecated and will be removed from 3.17-rc1. Please, use devm_ioremap_resource() instead. + dwc3_data->glue_base = devm_ioremap_resource(dev, res); + if (IS_ERR(dwc3_data->glue_base)) + return PTR_ERR(dwc3_data->glue_base); > + if (!dwc3_data->glue_base) > + return -EADDRNOTAVAIL; > + > + regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg"); > + if (IS_ERR(regmap)) > + return PTR_ERR(regmap); > + > + dwc3 = platform_device_alloc("st-dwc3", PLATFORM_DEVID_AUTO); > + if (!dwc3) { > + dev_err(&pdev->dev, "couldn't allocate dwc3 device\n"); > + return -ENOMEM; > + } > + > + dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask); > + > + dwc3->dev.parent = &pdev->dev; > + dwc3->dev.dma_mask = pdev->dev.dma_mask; > + dwc3->dev.dma_parms = pdev->dev.dma_parms; > + > + dwc3_data->dwc3 = dwc3; > + dwc3_data->dev = &pdev->dev; > + dwc3_data->regmap = regmap; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg"); > + if (!res) { > + ret = -ENXIO; > + goto undo_platform_dev_alloc; > + } > + > + dwc3_data->syscfg_reg_off = res->start; > + > + dev_info(&pdev->dev, "glue-logic addr 0x%p, syscfg-reg offset 0x%x\n", > + dwc3_data->glue_base, dwc3_data->syscfg_reg_off); > + > + dwc3_data->rstc_pwrdn = devm_reset_control_get(dwc3_data->dev, NULL); > + if (IS_ERR(dwc3_data->rstc_pwrdn)) { > + dev_err(&pdev->dev, "could not get reset controller\n"); > + ret = PTR_ERR(dwc3_data->rstc_pwrdn); > + goto undo_platform_dev_alloc; > + } > + > + /* Manage PowerDown */ > + reset_control_deassert(dwc3_data->rstc_pwrdn); > + > + st_dwc3_dt_get_pdata(pdev, dwc3_data); > + > + /* Allocate and initialize the core */ > + ret = of_platform_populate(node, NULL, NULL, dev); > + if (ret) { > + dev_err(dev, "failed to add dwc3 core\n"); > + goto undo_powerdown; > + } > + > + /* > + * Configure the USB port as device or host according to the static > + * configuration passed from the platform. > + * DRD is the only mode currently supported so this will be enhanced > + * later as soon as OTG will be available. > + */ > + ret = st_dwc3_drd_init(dwc3_data); > + if (ret) { > + dev_err(dev, "st_dwc3_drd_init failed\n"); > + goto undo_powerdown; > + } > + > + dev_info(&pdev->dev, "configured as %s DRD\n", > + dwc3_data->drd_device_conf ? "device" : "host"); > + > + /* ST glue logic init */ > + st_dwc3_init(dwc3_data); > + > + ret = platform_device_add_resources(dwc3_data->dwc3, pdev->resource, > + pdev->num_resources); > + if (ret) { > + dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n"); > + goto undo_powerdown; > + } > + > + ret = platform_device_add(dwc3_data->dwc3); > + if (ret) { > + dev_err(&pdev->dev, "failed to register dwc3 device\n"); > + goto undo_powerdown; > + } > + > + platform_set_drvdata(pdev, dwc3_data); > + > + return 0; > + > +undo_powerdown: > + reset_control_assert(dwc3_data->rstc_pwrdn); > +undo_platform_dev_alloc: > + platform_device_put(pdev); > + > + return ret; > + > +} > + > +static int st_dwc3_remove(struct platform_device *pdev) > +{ > + struct st_dwc3 *dwc3_data = platform_get_drvdata(pdev); > + > + platform_device_unregister(dwc3_data->dwc3); > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int st_dwc3_suspend(struct device *dev) > +{ > + struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); > + > + reset_control_assert(dwc3_data->rstc_pwrdn); > + > + pinctrl_pm_select_sleep_state(dev); > + > + return 0; > +} > + > +static int st_dwc3_resume(struct device *dev) > +{ > + struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); > + > + pinctrl_pm_select_default_state(dev); > + > + reset_control_deassert(dwc3_data->rstc_pwrdn); > + > + return 0; > +} > + > +#endif /* CONFIG_PM_SLEEP */ > + > +static const struct dev_pm_ops st_dwc3_dev_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(st_dwc3_suspend, st_dwc3_resume) > +}; > + > +static struct of_device_id st_dwc3_match[] = { Please add 'const' as below. This is because all OF functions handle of_device_id as const. static const struct of_device_id st_dwc3_match[] = { > + { .compatible = "st,stih407-dwc3" }, > + { /* sentinel */ }, > +}; > + > +MODULE_DEVICE_TABLE(of, st_dwc3_match); > + > +static struct platform_driver st_dwc3_driver = { > + .probe = st_dwc3_probe, > + .remove = st_dwc3_remove, > + .driver = { > + .name = "usb-st-dwc3", > + .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(st_dwc3_match), You already use OF dependency as below. So, of_match_ptr() is NOT necessary. +config USB_DWC3_ST + tristate "STMicroelectronics Platforms" + depends on ARCH_STI && OF Please remove of_match_ptr() as below. + .of_match_table = st_dwc3_match, Best regards, Jingoo Han > + .pm = &st_dwc3_dev_pm_ops, > + }, > +}; > + > +module_platform_driver(st_dwc3_driver); > + > +MODULE_AUTHOR("Giuseppe Cavallaro "); > +MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: jg1.han@samsung.com (Jingoo Han) Date: Mon, 07 Jul 2014 22:21:34 +0900 Subject: [PATCH v2 1/3] usb: dwc3: add ST dwc3 glue layer to manage dwc3 HC In-Reply-To: <1404541530-27856-2-git-send-email-peter.griffin@linaro.org> References: <1404541530-27856-1-git-send-email-peter.griffin@linaro.org> <1404541530-27856-2-git-send-email-peter.griffin@linaro.org> Message-ID: <000d01cf99e6$602096b0$2061c410$%han@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Saturday, July 05, 2014 3:25 PM, Peter Griffin wrote: > > This patch adds the ST glue logic to manage the DWC3 HC > on STiH407 SoC family. It manages the powerdown signal, > and configures the internal glue logic and syscfg registers. > > Signed-off-by: Giuseppe Cavallaro > Signed-off-by: Peter Griffin > --- > drivers/usb/dwc3/Kconfig | 9 ++ > drivers/usb/dwc3/Makefile | 1 + > drivers/usb/dwc3/dwc3-st.c | 325 +++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 335 insertions(+) > create mode 100644 drivers/usb/dwc3/dwc3-st.c > > diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig > index 8eb996e..6c85c43 100644 > --- a/drivers/usb/dwc3/Kconfig > +++ b/drivers/usb/dwc3/Kconfig > @@ -79,6 +79,15 @@ config USB_DWC3_KEYSTONE > Support of USB2/3 functionality in TI Keystone2 platforms. > Say 'Y' or 'M' here if you have one such device > > +config USB_DWC3_ST > + tristate "STMicroelectronics Platforms" > + depends on ARCH_STI && OF > + default USB_DWC3_HOST > + help > + STMicroelectronics SoCs with one DesignWare Core USB3 IP > + inside (i.e. STiH407). > + 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 10ac3e7..11c9f54 100644 > --- a/drivers/usb/dwc3/Makefile > +++ b/drivers/usb/dwc3/Makefile > @@ -33,3 +33,4 @@ 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_KEYSTONE) += dwc3-keystone.o > +obj-$(CONFIG_USB_DWC3_ST) += dwc3-st.o > diff --git a/drivers/usb/dwc3/dwc3-st.c b/drivers/usb/dwc3/dwc3-st.c > new file mode 100644 > index 0000000..2cae9d3 > --- /dev/null > +++ b/drivers/usb/dwc3/dwc3-st.c > @@ -0,0 +1,325 @@ > +/** > + * dwc3-st.c Support for dwc3 platform devices on ST Microelectronics platforms > + * > + * This is a small platform driver for the dwc3 to provide the glue logic > + * to configure the controller. Tested on STi platforms. > + * > + * Copyright (C) 2014 Stmicroelectronics > + * > + * Author: Giuseppe Cavallaro > + * Contributors: Aymen Bouattay > + * Peter Griffin > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * Inspired by dwc3-omap.c and dwc3-exynos.c. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include Would you re-order these headers alphabetically? It enhances the readability. > + > +#include "core.h" > +#include "io.h" > + > +/* Reg glue registers */ > +#define USB2_CLKRST_CTRL 0x00 > +#define aux_clk_en(n) ((n)<<0) > +#define sw_pipew_reset_n(n) ((n)<<4) > +#define ext_cfg_reset_n(n) ((n)<<8) > +#define xhci_revision(n) ((n)<<12) > + > +#define USB2_VBUS_MNGMNT_SEL1 0x2C > +/* > + * 2'b00 : Override value from Reg 0x30 is selected > + * 2'b01 : utmiotg_vbusvalid from usb3_top top is selected > + * 2'b10 : pipew_powerpresent from PIPEW instance is selected > + * 2'b11 : value is 1'b0 > + */ > +#define SEL_OVERRIDE_VBUSVALID(n) ((n)<<0) > +#define SEL_OVERRIDE_POWERPRESENT(n) ((n)<<4) > +#define SEL_OVERRIDE_BVALID(n) ((n)<<8) > + > +#define USB2_VBUS_MNGMNT_VAL1 0x30 > +#define OVERRIDE_VBUSVALID_VAL (1 << 0) > +#define OVERRIDE_POWERPRESENT_VAL (1 << 4) > +#define OVERRIDE_BVALID_VAL (1 << 8) > + > +/* Static DRD configuration */ > +#define USB_HOST_DEFAULT_MASK 0xffe > +#define USB_SET_PORT_DEVICE 0x1 > + > +struct st_dwc3 { > + struct platform_device *dwc3; /* platform device pointer */ > + struct device *dev; /* device pointer */ > + void __iomem *glue_base; /* ioaddr for programming the glue */ > + struct regmap *regmap; /* regmap for getting syscfg */ > + int syscfg_reg_off; /* usb syscfg control offset */ > + bool drd_device_conf; /* DRD static host/device conf */ > + struct reset_control *rstc_pwrdn;/* Rst control for powerdown*/ > +}; > + > +static inline u32 st_dwc3_readl(void __iomem *base, u32 offset) > +{ > + return readl_relaxed(base + offset); > +} > + > +static inline void st_dwc3_writel(void __iomem *base, u32 offset, u32 value) > +{ > + writel_relaxed(value, base + offset); > +} > + > +/** > + * st_dwc3_drd_init: program the port > + * @dwc3_data: driver private structure > + * Description: this function is to program the port as either host or device > + * according to the static configuration passed from devicetree. > + * OTG and dual role are not yet supported! > + */ > +static int st_dwc3_drd_init(struct st_dwc3 *dwc3_data) > +{ > + u32 val; > + > + regmap_read(dwc3_data->regmap, dwc3_data->syscfg_reg_off, &val); > + > + if (dwc3_data->drd_device_conf) > + val |= USB_SET_PORT_DEVICE; > + else > + val &= USB_HOST_DEFAULT_MASK; > + > + return regmap_write(dwc3_data->regmap, dwc3_data->syscfg_reg_off, val); > +} > + > +/** > + * st_dwc3_init: init the controller via glue logic > + * @dwc3_data: driver private structure > + */ > +static void st_dwc3_init(struct st_dwc3 *dwc3_data) > +{ > + u32 reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL); > + > + reg |= aux_clk_en(1) | ext_cfg_reset_n(1) | xhci_revision(1); > + reg &= ~sw_pipew_reset_n(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg); > + > + reg = st_dwc3_readl(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1); > + reg |= SEL_OVERRIDE_VBUSVALID(1) | SEL_OVERRIDE_POWERPRESENT(1) | > + SEL_OVERRIDE_BVALID(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_VBUS_MNGMNT_SEL1, reg); > + udelay(100); > + > + reg = st_dwc3_readl(dwc3_data->glue_base, USB2_CLKRST_CTRL); > + reg |= sw_pipew_reset_n(1); > + st_dwc3_writel(dwc3_data->glue_base, USB2_CLKRST_CTRL, reg); > +} > + > +static void st_dwc3_dt_get_pdata(struct platform_device *pdev, > + struct st_dwc3 *dwc3_data) > +{ > + struct device_node *np = pdev->dev.of_node; > + > + dwc3_data->drd_device_conf = > + of_property_read_bool(np, "st,dwc3-drd-device"); > +} > + > +/** > + * st_dwc3_probe: main probe function > + * @pdev: platform_device > + * Description: this is the probe function that gets all the resources to manage > + * the glue-logic, setup the controller and take out of powerdown. > + */ > +static int st_dwc3_probe(struct platform_device *pdev) > +{ > + struct platform_device *dwc3; > + struct st_dwc3 *dwc3_data; > + struct resource *res; > + struct device *dev = &pdev->dev; > + struct device_node *node = dev->of_node; > + struct regmap *regmap; > + int ret = 0; > + > + if (!node) { > + dev_err(dev, "device node not found\n"); > + return -EINVAL; > + } > + > + dwc3_data = devm_kzalloc(dev, sizeof(*dwc3_data), GFP_KERNEL); > + if (!dwc3_data) > + return -ENOMEM; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "reg-glue"); > + if (!res) > + return -ENXIO; > + > + dwc3_data->glue_base = devm_request_and_ioremap(dev, res); Please don't use devm_request_and_ioremap() any more. It was deprecated and will be removed from 3.17-rc1. Please, use devm_ioremap_resource() instead. + dwc3_data->glue_base = devm_ioremap_resource(dev, res); + if (IS_ERR(dwc3_data->glue_base)) + return PTR_ERR(dwc3_data->glue_base); > + if (!dwc3_data->glue_base) > + return -EADDRNOTAVAIL; > + > + regmap = syscon_regmap_lookup_by_phandle(node, "st,syscfg"); > + if (IS_ERR(regmap)) > + return PTR_ERR(regmap); > + > + dwc3 = platform_device_alloc("st-dwc3", PLATFORM_DEVID_AUTO); > + if (!dwc3) { > + dev_err(&pdev->dev, "couldn't allocate dwc3 device\n"); > + return -ENOMEM; > + } > + > + dma_set_coherent_mask(&dwc3->dev, dev->coherent_dma_mask); > + > + dwc3->dev.parent = &pdev->dev; > + dwc3->dev.dma_mask = pdev->dev.dma_mask; > + dwc3->dev.dma_parms = pdev->dev.dma_parms; > + > + dwc3_data->dwc3 = dwc3; > + dwc3_data->dev = &pdev->dev; > + dwc3_data->regmap = regmap; > + > + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "syscfg-reg"); > + if (!res) { > + ret = -ENXIO; > + goto undo_platform_dev_alloc; > + } > + > + dwc3_data->syscfg_reg_off = res->start; > + > + dev_info(&pdev->dev, "glue-logic addr 0x%p, syscfg-reg offset 0x%x\n", > + dwc3_data->glue_base, dwc3_data->syscfg_reg_off); > + > + dwc3_data->rstc_pwrdn = devm_reset_control_get(dwc3_data->dev, NULL); > + if (IS_ERR(dwc3_data->rstc_pwrdn)) { > + dev_err(&pdev->dev, "could not get reset controller\n"); > + ret = PTR_ERR(dwc3_data->rstc_pwrdn); > + goto undo_platform_dev_alloc; > + } > + > + /* Manage PowerDown */ > + reset_control_deassert(dwc3_data->rstc_pwrdn); > + > + st_dwc3_dt_get_pdata(pdev, dwc3_data); > + > + /* Allocate and initialize the core */ > + ret = of_platform_populate(node, NULL, NULL, dev); > + if (ret) { > + dev_err(dev, "failed to add dwc3 core\n"); > + goto undo_powerdown; > + } > + > + /* > + * Configure the USB port as device or host according to the static > + * configuration passed from the platform. > + * DRD is the only mode currently supported so this will be enhanced > + * later as soon as OTG will be available. > + */ > + ret = st_dwc3_drd_init(dwc3_data); > + if (ret) { > + dev_err(dev, "st_dwc3_drd_init failed\n"); > + goto undo_powerdown; > + } > + > + dev_info(&pdev->dev, "configured as %s DRD\n", > + dwc3_data->drd_device_conf ? "device" : "host"); > + > + /* ST glue logic init */ > + st_dwc3_init(dwc3_data); > + > + ret = platform_device_add_resources(dwc3_data->dwc3, pdev->resource, > + pdev->num_resources); > + if (ret) { > + dev_err(&pdev->dev, "couldn't add resources to dwc3 device\n"); > + goto undo_powerdown; > + } > + > + ret = platform_device_add(dwc3_data->dwc3); > + if (ret) { > + dev_err(&pdev->dev, "failed to register dwc3 device\n"); > + goto undo_powerdown; > + } > + > + platform_set_drvdata(pdev, dwc3_data); > + > + return 0; > + > +undo_powerdown: > + reset_control_assert(dwc3_data->rstc_pwrdn); > +undo_platform_dev_alloc: > + platform_device_put(pdev); > + > + return ret; > + > +} > + > +static int st_dwc3_remove(struct platform_device *pdev) > +{ > + struct st_dwc3 *dwc3_data = platform_get_drvdata(pdev); > + > + platform_device_unregister(dwc3_data->dwc3); > + > + return 0; > +} > + > +#ifdef CONFIG_PM_SLEEP > +static int st_dwc3_suspend(struct device *dev) > +{ > + struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); > + > + reset_control_assert(dwc3_data->rstc_pwrdn); > + > + pinctrl_pm_select_sleep_state(dev); > + > + return 0; > +} > + > +static int st_dwc3_resume(struct device *dev) > +{ > + struct st_dwc3 *dwc3_data = dev_get_drvdata(dev); > + > + pinctrl_pm_select_default_state(dev); > + > + reset_control_deassert(dwc3_data->rstc_pwrdn); > + > + return 0; > +} > + > +#endif /* CONFIG_PM_SLEEP */ > + > +static const struct dev_pm_ops st_dwc3_dev_pm_ops = { > + SET_SYSTEM_SLEEP_PM_OPS(st_dwc3_suspend, st_dwc3_resume) > +}; > + > +static struct of_device_id st_dwc3_match[] = { Please add 'const' as below. This is because all OF functions handle of_device_id as const. static const struct of_device_id st_dwc3_match[] = { > + { .compatible = "st,stih407-dwc3" }, > + { /* sentinel */ }, > +}; > + > +MODULE_DEVICE_TABLE(of, st_dwc3_match); > + > +static struct platform_driver st_dwc3_driver = { > + .probe = st_dwc3_probe, > + .remove = st_dwc3_remove, > + .driver = { > + .name = "usb-st-dwc3", > + .owner = THIS_MODULE, > + .of_match_table = of_match_ptr(st_dwc3_match), You already use OF dependency as below. So, of_match_ptr() is NOT necessary. +config USB_DWC3_ST + tristate "STMicroelectronics Platforms" + depends on ARCH_STI && OF Please remove of_match_ptr() as below. + .of_match_table = st_dwc3_match, Best regards, Jingoo Han > + .pm = &st_dwc3_dev_pm_ops, > + }, > +}; > + > +module_platform_driver(st_dwc3_driver); > + > +MODULE_AUTHOR("Giuseppe Cavallaro "); > +MODULE_DESCRIPTION("DesignWare USB3 STi Glue Layer"); > +MODULE_LICENSE("GPL v2"); > -- > 1.9.1