From patchwork Tue Aug 7 07:28:40 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: p.paneri@samsung.com X-Patchwork-Id: 1283891 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) by patchwork1.kernel.org (Postfix) with ESMTP id 64DC63FC23 for ; Tue, 7 Aug 2012 07:24:43 +0000 (UTC) Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Sye5X-00043f-5a; Tue, 07 Aug 2012 07:20:23 +0000 Received: from mailout4.samsung.com ([203.254.224.34]) by merlin.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1Sye54-0003os-Ld for linux-arm-kernel@lists.infradead.org; Tue, 07 Aug 2012 07:19:56 +0000 Received: from epcpsbgm2.samsung.com (mailout4.samsung.com [203.254.224.34]) by mailout4.samsung.com (Oracle Communications Messaging Server 7u4-24.01(7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTP id <0M8D00JAHJ0MEX50@mailout4.samsung.com> for linux-arm-kernel@lists.infradead.org; Tue, 07 Aug 2012 16:19:37 +0900 (KST) X-AuditID: cbfee61b-b7f566d000005c8a-7b-5020c1885251 Received: from epmmp1.local.host ( [203.254.227.16]) by epcpsbgm2.samsung.com (EPCPMTA) with SMTP id 98.F7.23690.881C0205; Tue, 07 Aug 2012 16:19:36 +0900 (KST) Received: from matrix.sisodomain.com ([107.108.73.199]) by mmp1.samsung.com (Oracle Communications Messaging Server 7u4-24.01 (7.0.4.24.0) 64bit (built Nov 17 2011)) with ESMTPA id <0M8D00MLJJ0GXX70@mmp1.samsung.com> for linux-arm-kernel@lists.infradead.org; Tue, 07 Aug 2012 16:19:36 +0900 (KST) From: Praveen Paneri To: linux-usb@vger.kernel.org Subject: [PATCH v2 1/5] usb: phy: samsung: Introducing usb phy driver for hsotg Date: Tue, 07 Aug 2012 12:58:40 +0530 Message-id: <1344324524-2286-2-git-send-email-p.paneri@samsung.com> X-Mailer: git-send-email 1.7.1 In-reply-to: <1344324524-2286-1-git-send-email-p.paneri@samsung.com> References: <1344324524-2286-1-git-send-email-p.paneri@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrAJMWRmVeSWpSXmKPExsVy+t9jAd2OgwoBBuv3mFhsenyN1YHRY/OS +gDGKC6blNSczLLUIn27BK6MxX93MBZ8z6nonTuBsYHxZkQXIyeHhICJxPzXq9ggbDGJC/fW A9lcHEICixglLh+ZygrhbGCSWLh1FmMXIwcHm4C2RMNMI5AGEQFZicNXfjOD2MwCd5gkDrWm g9jCAv4SP649YwMpZxFQlVizWBwkzCvgLLH16gEWiF1yEjtWP2ECsTkFXCQ+/LzACGILAdXc W9fONoGRdwEjwypG0dSC5ILipPRcI73ixNzi0rx0veT83E2MYH8/k97BuKrB4hCjAAejEg/v TBWFACHWxLLiytxDjBIczEoivId3AoV4UxIrq1KL8uOLSnNSiw8xSnOwKInzmnh/9RcSSE8s Sc1OTS1ILYLJMnFwSjUwmu29sMhNzq+tbf9fr4yLJqtDaq7adBUde3QmZaoofyV7yP0+7SPz XV4Lb3rMy5vqX/Qp4vg1Bf+Q0CXOD8MTPAsa7nws8DZIiXy5ouLylIbO7wq5Fzccf9Eise/y w7wJznKlHYGmH3J3nm6O3tTmFlEwxVlOvFJ4KcfR9fz9ttzWh+/z+kopsRRnJBpqMRcVJwIA qMUfYvMBAAA= X-TM-AS-MML: No X-Spam-Note: CRM114 invocation failed X-Spam-Score: -6.9 (------) X-Spam-Report: SpamAssassin version 3.3.2 on merlin.infradead.org summary: Content analysis details: (-6.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/, high trust [203.254.224.34 listed in list.dnswl.org] -0.0 SPF_HELO_PASS SPF: HELO matches SPF record -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay domain -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1% [score: 0.0000] Cc: l.majewski@samsung.com, kgene.kim@samsung.com, gregkh@linuxfoundation.org, devicetree-discuss@lists.ozlabs.org, broonie@opensource.wolfsonmicro.com, balbi@ti.com, grant.likely@secretlab.ca, kyungmin.park@samsung.com, linux-samsung-soc@vger.kernel.org, thomas.abraham@linaro.org, ben-linux@fluff.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: linux-arm-kernel-bounces@lists.infradead.org Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org This driver uses usb_phy interface to interact with s3c-hsotg. Supports phy_init and phy_shutdown functions to enable/disable phy. Tested with smdk6410 and smdkv310. More SoCs can be brought under later. Signed-off-by: Praveen Paneri --- .../devicetree/bindings/usb/samsung-usbphy.txt | 9 + drivers/usb/phy/Kconfig | 8 + drivers/usb/phy/Makefile | 1 + drivers/usb/phy/samsung_usbphy.c | 355 ++++++++++++++++++++ drivers/usb/phy/samsung_usbphy.h | 48 +++ include/linux/platform_data/s3c-hsotg.h | 5 + 6 files changed, 426 insertions(+), 0 deletions(-) create mode 100644 Documentation/devicetree/bindings/usb/samsung-usbphy.txt create mode 100644 drivers/usb/phy/samsung_usbphy.c create mode 100644 drivers/usb/phy/samsung_usbphy.h diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt new file mode 100644 index 0000000..fefd9c8 --- /dev/null +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt @@ -0,0 +1,9 @@ +* Samsung's usb phy transceiver + +The Samsung's phy transceiver is used for controlling usb otg phy for +s3c-hsotg usb device controller. + +Required properties: +- compatible : should be "samsung,exynos4210-usbphy" +- reg : base physical address of the phy registers and length of memory mapped + region. diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig index e7cf84f..d916477 100644 --- a/drivers/usb/phy/Kconfig +++ b/drivers/usb/phy/Kconfig @@ -15,3 +15,11 @@ config USB_ISP1301 To compile this driver as a module, choose M here: the module will be called isp1301. + +config SAMSUNG_USBPHY + bool "Samsung USB PHY controller Driver" + depends on USB_S3C_HSOTG + select USB_OTG_UTILS + help + Enable this to support Samsung USB phy controller for samsung + SoCs. diff --git a/drivers/usb/phy/Makefile b/drivers/usb/phy/Makefile index eca095b..c5a483d 100644 --- a/drivers/usb/phy/Makefile +++ b/drivers/usb/phy/Makefile @@ -5,3 +5,4 @@ ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG obj-$(CONFIG_USB_ISP1301) += isp1301.o +obj-$(CONFIG_SAMSUNG_USBPHY) += samsung_usbphy.o diff --git a/drivers/usb/phy/samsung_usbphy.c b/drivers/usb/phy/samsung_usbphy.c new file mode 100644 index 0000000..8e9e772 --- /dev/null +++ b/drivers/usb/phy/samsung_usbphy.c @@ -0,0 +1,355 @@ +/* linux/drivers/usb/phy/samsung_usbphy.c + * + * Copyright (c) 2012 Samsung Electronics Co., Ltd. + * http://www.samsung.com + * + * Author: Praveen Paneri + * + * Samsung USB2.0 High-speed OTG transceiver, talks to S3C HS OTG controller + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "samsung_usbphy.h" + +enum samsung_cpu_type { + TYPE_S3C64XX, + TYPE_EXYNOS4210, +}; + +/* + * struct samsung_usbphy - transceiver driver state + * @phy: transceiver structure + * @plat: platform data + * @dev: The parent device supplied to the probe function + * @clk: usb phy clock + * @regs: usb phy register memory base + * @cpu_type: machine identifier + */ +struct samsung_usbphy { + struct usb_phy phy; + struct s3c_usbphy_plat *plat; + struct device *dev; + struct clk *clk; + void __iomem *regs; + int cpu_type; +}; + +#define phy_to_sphy(x) container_of((x), struct samsung_usbphy, phy) + +/* + * Enables or disables the phy clock + * returns 0 on success else the error + */ +static int samsung_usbphy_clk_control(struct samsung_usbphy *sphy, bool on) +{ + if (on) { + if (!sphy->clk) { + sphy->clk = clk_get(sphy->dev, "otg"); + if (IS_ERR(sphy->clk)) { + dev_err(sphy->dev, "Failed to get otg clock\n"); + return PTR_ERR(sphy->clk); + } + } + clk_enable(sphy->clk); + } else { + clk_disable(sphy->clk); + clk_put(sphy->clk); + } + + return 0; +} + +/* + * Returns reference clock frequency + */ +static int samsung_usbphy_get_refclk_freq(struct samsung_usbphy *sphy) +{ + struct clk *ref_clk; + int refclk_freq = 0; + + ref_clk = clk_get(sphy->dev, "xusbxti"); + if (IS_ERR(ref_clk)) { + dev_err(sphy->dev, "Failed to get reference clock\n"); + return PTR_ERR(ref_clk); + } + + switch (clk_get_rate(ref_clk)) { + case 12 * MHZ: + refclk_freq |= S3C_PHYCLK_CLKSEL_12M; + break; + case 24 * MHZ: + refclk_freq |= S3C_PHYCLK_CLKSEL_24M; + break; + default: + case 48 * MHZ: + /* default reference clock */ + refclk_freq |= S3C_PHYCLK_CLKSEL_48M; + break; + } + clk_put(ref_clk); + + return refclk_freq; +} + +static void samsung_usbphy_enable(struct samsung_usbphy *sphy) +{ + void __iomem *regs = sphy->regs; + u32 phypwr; + u32 phyclk; + u32 rstcon; + + /* set clock frequency for PLL */ + phyclk = samsung_usbphy_get_refclk_freq(sphy); + phypwr = readl(regs + S3C_PHYPWR); + rstcon = readl(regs + S3C_RSTCON); + + switch (sphy->cpu_type) { + case TYPE_S3C64XX: + phyclk &= ~(S3C_PHYCLK_COMMON_ON_N); + phypwr &= ~S3C_PHYPWR_NORMAL_MASK; + rstcon |= S3C_RSTCON_PHY; + break; + case TYPE_EXYNOS4210: + phypwr &= ~EXYNOS4_PHYPWR_NORMAL_MASK; + rstcon |= S3C_RSTCON_PHY; + default: + break; + } + + writel(phyclk, regs + S3C_PHYCLK); + /* set to normal of PHY0 */ + writel(phypwr, regs + S3C_PHYPWR); + /* reset all ports of PHY and Link */ + writel(rstcon, regs + S3C_RSTCON); + udelay(10); + rstcon &= ~S3C_RSTCON_PHY; + writel(rstcon, regs + S3C_RSTCON); +} + +static void samsung_usbphy_disable(struct samsung_usbphy *sphy) +{ + void __iomem *regs = sphy->regs; + u32 phypwr; + + phypwr = readl(regs + S3C_PHYPWR); + + switch (sphy->cpu_type) { + case TYPE_S3C64XX: + phypwr |= S3C_PHYPWR_NORMAL_MASK; + break; + case TYPE_EXYNOS4210: + phypwr |= EXYNOS4_PHYPWR_NORMAL_MASK; + default: + break; + } + + /* unset to normal of PHY0 */ + writel(phypwr, regs + S3C_PHYPWR); +} + +/* + * The function passed to the usb driver for phy initialization + */ +static int samsung_usbphy_init(struct usb_phy *phy) +{ + struct samsung_usbphy *sphy; + int ret = 0; + + sphy = phy_to_sphy(phy); + + /* Enable the phy clock */ + ret = samsung_usbphy_clk_control(sphy, true); + if (ret) { + dev_err(sphy->dev, "phy clock enable failed\n"); + return ret; + } + + /* Disable phy isolation */ + if (sphy->plat && sphy->plat->pmu_isolation) + sphy->plat->pmu_isolation(false); + + /* Initialize usb phy registers */ + samsung_usbphy_enable(sphy); + return ret; +} + +/* + * The function passed to the usb driver for phy shutdown + */ +static void samsung_usbphy_shutdown(struct usb_phy *phy) +{ + struct samsung_usbphy *sphy; + + sphy = phy_to_sphy(phy); + + /* De-initialize usb phy registers */ + samsung_usbphy_disable(sphy); + + /* Enable phy isolation */ + if (sphy->plat && sphy->plat->pmu_isolation) + sphy->plat->pmu_isolation(true); + + /* Disable the phy clock */ + samsung_usbphy_clk_control(sphy, false); +} + +static const struct of_device_id samsung_usbphy_dt_match[]; + +static inline int samsung_usbphy_get_driver_data(struct platform_device *pdev) +{ +#ifdef CONFIG_OF + int data; + if (pdev->dev.of_node) { + const struct of_device_id *match; + match = of_match_node(samsung_usbphy_dt_match, + pdev->dev.of_node); + data = (int) match->data; + return data; + } +#endif + return platform_get_device_id(pdev)->driver_data; +} + +static int __devinit samsung_usbphy_probe(struct platform_device *pdev) +{ + struct samsung_usbphy *sphy; + struct s3c_usbphy_plat *pdata; + struct device *dev = &pdev->dev; + struct resource *phy_mem; + void __iomem *phy_base; + int ret; + + pdata = pdev->dev.platform_data; + if (!pdata) { + dev_err(&pdev->dev, "%s: no platform data defined\n", __func__); + return -EINVAL; + } + + phy_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!phy_mem) { + dev_err(dev, "%s: missing mem resource\n", __func__); + return -ENODEV; + } + + phy_base = devm_request_and_ioremap(dev, phy_mem); + if (!phy_base) { + dev_err(dev, "%s: register mapping failed\n", __func__); + return -ENXIO; + } + + sphy = devm_kzalloc(dev, sizeof(*sphy), GFP_KERNEL); + if (!sphy) + return -ENOMEM; + + sphy->dev = &pdev->dev; + sphy->plat = pdata; + sphy->regs = phy_base; + sphy->phy.dev = sphy->dev; + sphy->phy.label = "samsung-usbphy"; + sphy->phy.init = samsung_usbphy_init; + sphy->phy.shutdown = samsung_usbphy_shutdown; + sphy->cpu_type = samsung_usbphy_get_driver_data(pdev); + + ret = usb_add_phy(&sphy->phy, USB_PHY_TYPE_USB2); + if (ret) + goto err; + + platform_set_drvdata(pdev, sphy); + + dev_info(&pdev->dev, "Initialized samsung USB OTG PHY module\n"); +err: + return ret; +} + +static int __exit samsung_usbphy_remove(struct platform_device *pdev) +{ + struct samsung_usbphy *sphy = platform_get_drvdata(pdev); + + usb_remove_phy(&sphy->phy); + + if (sphy->clk) { + clk_put(sphy->clk); + sphy->clk = NULL; + } + + return 0; +} + +#ifdef CONFIG_OF +static const struct of_device_id samsung_usbphy_dt_match[] = { + { + .compatible = "samsung,s3c64xx-usbphy", + .data = (void *)TYPE_S3C64XX, + }, { + .compatible = "samsung,exynos4210-usbphy", + .data = (void *)TYPE_EXYNOS4210, + }, + {}, +}; +MODULE_DEVICE_TABLE(of, samsung_usbphy_dt_match); +#else +#define samsung_usbphy_dt_match NULL +#endif + +static struct platform_device_id samsung_usbphy_driver_ids[] = { + { + .name = "s3c64xx-usbphy", + .driver_data = TYPE_S3C64XX, + }, { + .name = "exynos4210-usbphy", + .driver_data = TYPE_EXYNOS4210, + }, + {}, +}; + +MODULE_DEVICE_TABLE(platform, samsung_usbphy_driver_ids); + +static struct platform_driver samsung_usbphy_driver = { + .probe = samsung_usbphy_probe, + .remove = __devexit_p(samsung_usbphy_remove), + .id_table = samsung_usbphy_driver_ids, + .driver = { + .name = "samsung-usbphy", + .owner = THIS_MODULE, + .of_match_table = samsung_usbphy_dt_match, + }, +}; + +static int __init samsung_usbphy_driver_init(void) +{ + return platform_driver_register(&samsung_usbphy_driver); +} +subsys_initcall(samsung_usbphy_driver_init); + +static void __exit samsung_usbphy_driver_exit(void) +{ + return platform_driver_unregister(&samsung_usbphy_driver); +} +module_exit(samsung_usbphy_driver_exit); + +MODULE_DESCRIPTION("Samsung USB phy controller"); +MODULE_AUTHOR("Praveen Paneri "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:samsung-usbphy"); diff --git a/drivers/usb/phy/samsung_usbphy.h b/drivers/usb/phy/samsung_usbphy.h new file mode 100644 index 0000000..093b1dc --- /dev/null +++ b/drivers/usb/phy/samsung_usbphy.h @@ -0,0 +1,48 @@ +/* + * Copyright (C) 2012 Samsung Electronics Co.Ltd + * Author: Yulgon Kim + * Author: Joonyoung Shim + * Author: Praveen Paneri + * + * 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. + */ + +#ifndef __SAMSUNG_USBPHY_H +#define __SAMSUNG_USBPHY_H + +#define S3C_PHYPWR (0x00) + +#define S3C_PHYPWR_NORMAL_MASK (0x19 << 0) +#define S3C_PHYPWR_OTG_DISABLE (1 << 4) +#define S3C_PHYPWR_ANALOG_POWERDOWN (1 << 3) +#define S3C_PHYPWR_FORCE_SUSPEND (1 << 1) +/* For Exynos4 */ +#define EXYNOS4_PHYPWR_NORMAL_MASK (0x39 << 0) +#define EXYNOS4_PHYPWR_SLEEP (1 << 5) + +#define S3C_PHYCLK (0x04) + +#define S3C_PHYCLK_MODE_SERIAL (1 << 6) +#define S3C_PHYCLK_EXT_OSC (1 << 5) +#define S3C_PHYCLK_COMMON_ON_N (1 << 4) +#define S3C_PHYCLK_ID_PULL (1 << 2) +#define S3C_PHYCLK_CLKSEL_MASK (0x3 << 0) +#define S3C_PHYCLK_CLKSEL_SHIFT (0) +#define S3C_PHYCLK_CLKSEL_48M (0x0 << 0) +#define S3C_PHYCLK_CLKSEL_12M (0x2 << 0) +#define S3C_PHYCLK_CLKSEL_24M (0x3 << 0) + +#define S3C_RSTCON (0x08) + +#define S3C_RSTCON_PHYCLK (1 << 2) +#define S3C_RSTCON_HCLK (1 << 1) +#define S3C_RSTCON_PHY (1 << 0) + +#ifndef MHZ +#define MHZ (1000*1000) +#endif + +#endif /* __SAMSUNG_USBPHY_H */ diff --git a/include/linux/platform_data/s3c-hsotg.h b/include/linux/platform_data/s3c-hsotg.h index 8b79e09..25ed31e 100644 --- a/include/linux/platform_data/s3c-hsotg.h +++ b/include/linux/platform_data/s3c-hsotg.h @@ -35,6 +35,11 @@ struct s3c_hsotg_plat { int (*phy_exit)(struct platform_device *pdev, int type); }; +struct s3c_usbphy_plat { + void (*pmu_isolation)(int on); +}; + extern void s3c_hsotg_set_platdata(struct s3c_hsotg_plat *pd); +extern void s3c_usbphy_set_platdata(struct s3c_usbphy_plat *pd); #endif /* __LINUX_USB_S3C_HSOTG_H */