Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753625AbdHKQbW (ORCPT ); Fri, 11 Aug 2017 12:31:22 -0400 Received: from mailapp01.imgtec.com ([195.59.15.196]:44546 "EHLO mailapp01.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752850AbdHKQbU (ORCPT ); Fri, 11 Aug 2017 12:31:20 -0400 From: Harvey Hunt To: , , , CC: , John Crispin , Harvey Hunt , , Subject: [V5 1/2] phy: ralink-usb: add driver for Mediatek/Ralink Date: Fri, 11 Aug 2017 17:31:09 +0100 Message-ID: <1502469070-13157-1-git-send-email-harvey.hunt@imgtec.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [192.168.154.107] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 7003 Lines: 248 From: John Crispin Add a driver to setup the USB phy on Mediatek/Ralink SoCs. The driver is trivial and only sets up power and host mode. Signed-off-by: John Crispin Signed-off-by: Harvey Hunt Cc: linux-kernel@vger.kernel.org Cc: linux-mediatek@lists.infradead.org --- Changes in V5 * Depend on MIPS Changes in V4 * Remove Allwinner from comment * Depend on COMPILE_TEST Changes in V3 * Separate DT bindings * Update Kconfig text * Modify John's email address * Rebase onto v4.13-rc3 Changes in V2 * remove refcounting * drop empty functions * dont use static globals * use explicit compatible strings drivers/phy/Kconfig | 9 +++ drivers/phy/Makefile | 1 + drivers/phy/phy-ralink-usb.c | 173 +++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 183 insertions(+) create mode 100644 drivers/phy/phy-ralink-usb.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index c1807d4..112a146 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -41,6 +41,15 @@ config PHY_PISTACHIO_USB help Enable this to support the USB2.0 PHY on the IMG Pistachio SoC. +config PHY_RALINK_USB + tristate "Ralink USB PHY driver" + depends on RALINK || COMPILE_TEST + depends on MIPS + select GENERIC_PHY + help + This option enables support for the Ralink USB PHY found inside + RT3352, MT7620, MT7628 and MT7688. + config PHY_XGENE tristate "APM X-Gene 15Gbps PHY support" depends on HAS_IOMEM && OF && (ARM64 || COMPILE_TEST) diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index f252201..60ed30b 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_PHY_LPC18XX_USB_OTG) += phy-lpc18xx-usb-otg.o obj-$(CONFIG_PHY_MT65XX_USB3) += phy-mt65xx-usb3.o obj-$(CONFIG_PHY_XGENE) += phy-xgene.o obj-$(CONFIG_PHY_PISTACHIO_USB) += phy-pistachio-usb.o +obj-$(CONFIG_PHY_RALINK_USB) += phy-ralink-usb.o obj-$(CONFIG_ARCH_SUNXI) += allwinner/ obj-$(CONFIG_ARCH_MESON) += amlogic/ diff --git a/drivers/phy/phy-ralink-usb.c b/drivers/phy/phy-ralink-usb.c new file mode 100644 index 0000000..14a254a --- /dev/null +++ b/drivers/phy/phy-ralink-usb.c @@ -0,0 +1,173 @@ +/* + * Copyright (C) 2016 John Crispin + * + * Based on code from + * Allwinner Technology Co., Ltd. + * + * 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. + * + * 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 + +#include + +#define RT_SYSC_REG_SYSCFG1 0x014 +#define RT_SYSC_REG_CLKCFG1 0x030 +#define RT_SYSC_REG_USB_PHY_CFG 0x05c + +#define RT_RSTCTRL_UDEV BIT(25) +#define RT_RSTCTRL_UHST BIT(22) +#define RT_SYSCFG1_USB0_HOST_MODE BIT(10) + +#define MT7620_CLKCFG1_UPHY0_CLK_EN BIT(25) +#define MT7620_CLKCFG1_UPHY1_CLK_EN BIT(22) +#define RT_CLKCFG1_UPHY1_CLK_EN BIT(20) +#define RT_CLKCFG1_UPHY0_CLK_EN BIT(18) + +#define USB_PHY_UTMI_8B60M BIT(1) +#define UDEV_WAKEUP BIT(0) + +struct ralink_usb_phy { + struct reset_control *rstdev; + struct reset_control *rsthost; + u32 clk; + struct phy *phy; +}; + +static int ralink_usb_phy_power_on(struct phy *_phy) +{ + struct ralink_usb_phy *phy = phy_get_drvdata(_phy); + u32 t; + + /* enable the phy */ + rt_sysc_m32(0, phy->clk, RT_SYSC_REG_CLKCFG1); + + /* setup host mode */ + rt_sysc_m32(0, RT_SYSCFG1_USB0_HOST_MODE, RT_SYSC_REG_SYSCFG1); + + /* deassert the reset lines */ + reset_control_deassert(phy->rsthost); + reset_control_deassert(phy->rstdev); + + /* + * The SDK kernel had a delay of 100ms. however on device + * testing showed that 10ms is enough + */ + mdelay(10); + + /* print some status info */ + t = rt_sysc_r32(RT_SYSC_REG_USB_PHY_CFG); + dev_info(&phy->phy->dev, "remote usb device wakeup %s\n", + (t & UDEV_WAKEUP) ? ("enabled") : ("disabled")); + if (t & USB_PHY_UTMI_8B60M) + dev_info(&phy->phy->dev, "UTMI 8bit 60MHz\n"); + else + dev_info(&phy->phy->dev, "UTMI 16bit 30MHz\n"); + + return 0; +} + +static int ralink_usb_phy_power_off(struct phy *_phy) +{ + struct ralink_usb_phy *phy = phy_get_drvdata(_phy); + + /* disable the phy */ + rt_sysc_m32(phy->clk, 0, RT_SYSC_REG_CLKCFG1); + + /* assert the reset lines */ + reset_control_assert(phy->rstdev); + reset_control_assert(phy->rsthost); + + return 0; +} + +static struct phy_ops ralink_usb_phy_ops = { + .power_on = ralink_usb_phy_power_on, + .power_off = ralink_usb_phy_power_off, + .owner = THIS_MODULE, +}; + +static const struct of_device_id ralink_usb_phy_of_match[] = { + { + .compatible = "ralink,rt3352-usbphy", + .data = (void *) (RT_CLKCFG1_UPHY1_CLK_EN | + RT_CLKCFG1_UPHY0_CLK_EN) + }, + { + .compatible = "mediatek,mt7620-usbphy", + .data = (void *) (MT7620_CLKCFG1_UPHY1_CLK_EN | + MT7620_CLKCFG1_UPHY0_CLK_EN) }, + { }, +}; +MODULE_DEVICE_TABLE(of, ralink_usb_phy_of_match); + +static int ralink_usb_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct phy_provider *phy_provider; + const struct of_device_id *match; + struct ralink_usb_phy *phy; + + phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL); + if (!phy) + return -ENOMEM; + + match = of_match_device(ralink_usb_phy_of_match, &pdev->dev); + if (!match) + return -ENODEV; + + phy->clk = (int) match->data; + + phy->rsthost = devm_reset_control_get(&pdev->dev, "host"); + if (IS_ERR(phy->rsthost)) { + dev_err(dev, "host reset is missing\n"); + return PTR_ERR(phy->rsthost); + } + + phy->rstdev = devm_reset_control_get(&pdev->dev, "device"); + if (IS_ERR(phy->rstdev)) { + dev_err(dev, "device reset is missing\n"); + return PTR_ERR(phy->rstdev); + } + + phy->phy = devm_phy_create(dev, NULL, &ralink_usb_phy_ops); + if (IS_ERR(phy->phy)) { + dev_err(dev, "failed to create PHY\n"); + return PTR_ERR(phy->phy); + } + phy_set_drvdata(phy->phy, phy); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + + return PTR_ERR_OR_ZERO(phy_provider); +} + +static struct platform_driver ralink_usb_phy_driver = { + .probe = ralink_usb_phy_probe, + .driver = { + .of_match_table = ralink_usb_phy_of_match, + .name = "ralink-usb-phy", + } +}; +module_platform_driver(ralink_usb_phy_driver); + +MODULE_DESCRIPTION("Ralink USB phy driver"); +MODULE_AUTHOR("John Crispin "); +MODULE_LICENSE("GPL v2"); -- 2.7.4