From patchwork Sat Apr 12 00:15:42 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sergei Shtylyov X-Patchwork-Id: 3972411 Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id B86AD9F370 for ; Sat, 12 Apr 2014 00:15:43 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 81226202EC for ; Sat, 12 Apr 2014 00:15:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3355B202FE for ; Sat, 12 Apr 2014 00:15:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755060AbaDLAPk (ORCPT ); Fri, 11 Apr 2014 20:15:40 -0400 Received: from mail-la0-f41.google.com ([209.85.215.41]:37184 "EHLO mail-la0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751520AbaDLAPj (ORCPT ); Fri, 11 Apr 2014 20:15:39 -0400 Received: by mail-la0-f41.google.com with SMTP id gl10so4126885lab.0 for ; Fri, 11 Apr 2014 17:15:37 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:to:subject:cc:from:organization:date :mime-version:content-type:content-transfer-encoding:message-id; bh=Ik+coQnyMVZyfUanfvtRBcjBFcXakmucc6E98gKt5Hg=; b=ALtWgFGtTF1aUBi8N4HR/SA4tPZVzwGYvJqdgmOfkHrNbNhFxYt3PSc9Tfil09mAVT m9MTF4yjbjrfzaUiAKD9tjxBHJvnXN9ZVTZlmdJ0jmt0LKjFIy2WBwW0iZOoA14errAc JBCjdkOwThJQN8xEgviql/W0IgjxIxoZ19xeOC5/gKhEk083I1REMyLYVDhQICH4sc09 QBJKry+yYeMq1yBaWcTqiNJgR2XCOSlRXk+dCxM6SdtEah9ZKjb0WObu0Y4qlicvAYgL fLqFzzqIADyhbD1jrlG6MzPsOXYjVpIZFIjCKvJFX8VZ+BjhhMYc8aCFtpD8nhd4km4m i6aQ== X-Gm-Message-State: ALoCoQmc/X4hbhMWA5wJ49m+aMWfdZ+1p5FtcTYgChMJSs5CCxeInUcWQnf6HsykPF/kSWFAnRyg X-Received: by 10.152.184.66 with SMTP id es2mr18786018lac.22.1397261737334; Fri, 11 Apr 2014 17:15:37 -0700 (PDT) Received: from wasted.cogentembedded.com (ppp85-140-139-249.pppoe.mtu-net.ru. [85.140.139.249]) by mx.google.com with ESMTPSA id rd5sm7244489lbb.0.2014.04.11.17.15.36 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Fri, 11 Apr 2014 17:15:36 -0700 (PDT) To: devicetree@vger.kernel.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, kishon@ti.com, grant.likely@linaro.org Subject: [PATCH v3] phy: Renesas R-Car Gen2 PHY driver Cc: linux-sh@vger.kernel.org, magnus.damm@gmail.com, linux-doc@vger.kernel.org, rdunlap@infradead.org From: Sergei Shtylyov Organization: Cogent Embedded Date: Sat, 12 Apr 2014 04:15:42 +0400 MIME-Version: 1.0 Message-Id: <201404120415.43761.sergei.shtylyov@cogentembedded.com> Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-7.3 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This PHY, though formally being a part of Renesas USBHS controller, contains the UGCTRL2 register that controls multiplexing of the USB ports (Renesas calls them channels) to the different USB controllers: channel 0 can be connected to either PCI EHCI/OHCI or USBHS controllers, channel 2 can be connected to PCI EHCI/OHCI or xHCI controllers. This is a new driver for this USB PHY currently already supported under drivers/ usb/phy/. The reason for writing the new driver was the requirement that the multiplexing of USB channels to the controller be dynamic, depending on what USB drivers are loaded, rather than static as provided by the old driver. The infrastructure provided by drivers/phy/phy-core.c seems to fit that purpose ideally. The new driver only supports device tree probing for now. Signed-off-by: Sergei Shtylyov --- The patch is against the 'next' branch of Kishon's 'linux-phy.git' repo. Changes in version 3: - removed 'rcar_gen2_usbhs_phy_ops', moving 'power_{on|off}' intializers to 'rcar_gen2_phy_ops' and adding a check for USBHS PHY to power_{on|off}() methods; - renamed the power_{on|off}() methods; - replaced io{read|write}16() calls with {read|write}w(); - removed the comment to '#define USBHS_UGSTS_LOCK'; - broke the line in the dev_err() call in the probe() method; - moved the driver's line in the 'Makefile' before OMAP drivers. Changes in version 2: - rebased the patch, resolving reject. Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt | 35 + drivers/phy/Kconfig | 7 drivers/phy/Makefile | 1 drivers/phy/phy-rcar-gen2.c | 283 ++++++++++++++++ 4 files changed, 326 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Index: linux-phy/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt =================================================================== --- /dev/null +++ linux-phy/Documentation/devicetree/bindings/phy/rcar-gen2-phy.txt @@ -0,0 +1,35 @@ +* Renesas R-Car generation 2 USB PHY + +This file provides information on what the device node for the R-Car generation +2 USB PHY contains. + +Required properties: +- compatible: "renesas,usb-phy-r8a7790" if the device is a part of R8A7790 SoC. + "renesas,usb-phy-r8a7791" if the device is a part of R8A7791 SoC. +- reg: offset and length of the register block. +- #phy-cells: see phy-bindings.txt in the same directory, must be 2. +- clocks: clock phandle and specifier pair. +- clock-names: string, clock input name, must be "usbhs". + +The phandle's first argument in the PHY specifier identifies the USB channel, +the second one is the USB controller selector and depends on the first: + ++-----------+---------------+---------------+ +|\ Selector | | | ++ --------- + 0 | 1 | +| Channel \| | | ++-----------+---------------+---------------+ +| 0 | PCI EHCI/OHCI | HS-USB | +| 1 | PCI EHCI/OHCI | PCI EHCI/OHCI | +| 2 | PCI EHCI/OHCI | xHCI | ++-----------+---------------+---------------+ + +Example (Lager board): + + usb-phy@e6590100 { + compatible = "renesas,usb-phy-r8a7790"; + reg = <0 0xe6590100 0 0x100>; + #phy-cells = <2>; + clocks = <&mstp7_clks R8A7790_CLK_HSUSB>; + clock-names = "usbhs"; + }; Index: linux-phy/drivers/phy/Kconfig =================================================================== --- linux-phy.orig/drivers/phy/Kconfig +++ linux-phy/drivers/phy/Kconfig @@ -31,6 +31,13 @@ config PHY_MVEBU_SATA depends on OF select GENERIC_PHY +config PHY_RCAR_GEN2 + tristate "Renesas R-Car generation 2 USB PHY driver" + depends on ARCH_SHMOBILE + depends on GENERIC_PHY + help + Support for USB PHY found on Renesas R-Car generation 2 SoCs. + config OMAP_CONTROL_PHY tristate "OMAP CONTROL PHY Driver" help Index: linux-phy/drivers/phy/Makefile =================================================================== --- linux-phy.orig/drivers/phy/Makefile +++ linux-phy/drivers/phy/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_BCM_KONA_USB2_PHY) += phy- obj-$(CONFIG_PHY_EXYNOS_DP_VIDEO) += phy-exynos-dp-video.o obj-$(CONFIG_PHY_EXYNOS_MIPI_VIDEO) += phy-exynos-mipi-video.o obj-$(CONFIG_PHY_MVEBU_SATA) += phy-mvebu-sata.o +obj-$(CONFIG_PHY_RCAR_GEN2) += phy-rcar-gen2.o obj-$(CONFIG_OMAP_CONTROL_PHY) += phy-omap-control.o obj-$(CONFIG_OMAP_USB2) += phy-omap-usb2.o obj-$(CONFIG_TI_PIPE3) += phy-ti-pipe3.o Index: linux-phy/drivers/phy/phy-rcar-gen2.c =================================================================== --- /dev/null +++ linux-phy/drivers/phy/phy-rcar-gen2.c @@ -0,0 +1,283 @@ +/* + * Renesas R-Car Gen2 PHY driver + * + * Copyright (C) 2014 Renesas Solutions Corp. + * Copyright (C) 2014 Cogent Embedded, Inc. + * + * 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. + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define USBHS_LPSTS 0x02 +#define USBHS_UGCTRL 0x80 +#define USBHS_UGCTRL2 0x84 +#define USBHS_UGSTS 0x88 + +/* Low Power Status register (LPSTS) */ +#define USBHS_LPSTS_SUSPM 0x4000 + +/* USB General control register (UGCTRL) */ +#define USBHS_UGCTRL_CONNECT 0x00000004 +#define USBHS_UGCTRL_PLLRESET 0x00000001 + +/* USB General control register 2 (UGCTRL2) */ +#define USBHS_UGCTRL2_USB2SEL 0x80000000 +#define USBHS_UGCTRL2_USB2SEL_PCI 0x00000000 +#define USBHS_UGCTRL2_USB2SEL_USB30 0x80000000 +#define USBHS_UGCTRL2_USB0SEL 0x00000030 +#define USBHS_UGCTRL2_USB0SEL_PCI 0x00000010 +#define USBHS_UGCTRL2_USB0SEL_HS_USB 0x00000030 + +/* USB General status register (UGSTS) */ +#define USBHS_UGSTS_LOCK 0x00000300 + +#define NUM_USB_CHANNELS 3 + +struct rcar_gen2_phy { + struct phy *phy; + struct rcar_gen2_phy_driver *drv; + u32 select_mask; + u32 select_value; +}; + +struct rcar_gen2_phy_driver { + void __iomem *base; + struct clk *clk; + spinlock_t lock; + struct rcar_gen2_phy phys[NUM_USB_CHANNELS][2]; +}; + +static int rcar_gen2_phy_init(struct phy *p) +{ + struct rcar_gen2_phy *phy = phy_get_drvdata(p); + struct rcar_gen2_phy_driver *drv = phy->drv; + unsigned long flags; + u32 ugctrl2; + + if (phy->select_mask) { + clk_prepare_enable(drv->clk); + + spin_lock_irqsave(&drv->lock, flags); + ugctrl2 = readl(drv->base + USBHS_UGCTRL2); + ugctrl2 &= ~phy->select_mask; + ugctrl2 |= phy->select_value; + writel(ugctrl2, drv->base + USBHS_UGCTRL2); + spin_unlock_irqrestore(&drv->lock, flags); + } + + return 0; +} + +static int rcar_gen2_phy_exit(struct phy *p) +{ + struct rcar_gen2_phy *phy = phy_get_drvdata(p); + + if (phy->select_mask) + clk_disable_unprepare(phy->drv->clk); + + return 0; +} + +static int rcar_gen2_phy_power_on(struct phy *p) +{ + struct rcar_gen2_phy *phy = phy_get_drvdata(p); + struct rcar_gen2_phy_driver *drv = phy->drv; + void __iomem *base = drv->base; + unsigned long flags; + u32 value; + int err = 0, i; + + /* Skip if it's not USBHS */ + if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) + return 0; + + spin_lock_irqsave(&drv->lock, flags); + + /* Power on USBHS PHY */ + value = readl(base + USBHS_UGCTRL); + value &= ~USBHS_UGCTRL_PLLRESET; + writel(value, base + USBHS_UGCTRL); + + value = readw(base + USBHS_LPSTS); + value |= USBHS_LPSTS_SUSPM; + writew(value, base + USBHS_LPSTS); + + for (i = 0; i < 20; i++) { + value = readl(base + USBHS_UGSTS); + if ((value & USBHS_UGSTS_LOCK) == USBHS_UGSTS_LOCK) { + value = readl(base + USBHS_UGCTRL); + value |= USBHS_UGCTRL_CONNECT; + writel(value, base + USBHS_UGCTRL); + goto out; + } + udelay(1); + } + + /* Timed out waiting for the PLL lock */ + err = -ETIMEDOUT; + +out: + spin_unlock_irqrestore(&drv->lock, flags); + + return err; +} + +static int rcar_gen2_phy_power_off(struct phy *p) +{ + struct rcar_gen2_phy *phy = phy_get_drvdata(p); + struct rcar_gen2_phy_driver *drv = phy->drv; + void __iomem *base = drv->base; + unsigned long flags; + u32 value; + + /* Skip if it's not USBHS */ + if (phy->select_value != USBHS_UGCTRL2_USB0SEL_HS_USB) + return 0; + + spin_lock_irqsave(&drv->lock, flags); + + /* Power off USBHS PHY */ + value = readl(base + USBHS_UGCTRL); + value &= ~USBHS_UGCTRL_CONNECT; + writel(value, base + USBHS_UGCTRL); + + value = readw(base + USBHS_LPSTS); + value &= ~USBHS_LPSTS_SUSPM; + writew(value, base + USBHS_LPSTS); + + value = readl(base + USBHS_UGCTRL); + value |= USBHS_UGCTRL_PLLRESET; + writel(value, base + USBHS_UGCTRL); + + spin_unlock_irqrestore(&drv->lock, flags); + + return 0; +} + +static struct phy_ops rcar_gen2_phy_ops = { + .init = rcar_gen2_phy_init, + .exit = rcar_gen2_phy_exit, + .power_on = rcar_gen2_phy_power_on, + .power_off = rcar_gen2_phy_power_off, + .owner = THIS_MODULE, +}; + +static const struct of_device_id rcar_gen2_phy_match_table[] = { + { .compatible = "renesas,usb-phy-r8a7790" }, + { .compatible = "renesas,usb-phy-r8a7791" }, + { } +}; +MODULE_DEVICE_TABLE(of, rcar_gen2_phy_match_table); + +static struct phy *rcar_gen2_phy_xlate(struct device *dev, + struct of_phandle_args *args) +{ + struct rcar_gen2_phy_driver *drv; + + drv = dev_get_drvdata(dev); + if (!drv) + return ERR_PTR(-EINVAL); + + if (args->args[0] >= NUM_USB_CHANNELS || args->args[1] >= 2) + return ERR_PTR(-ENODEV); + + return drv->phys[args->args[0]][args->args[1]].phy; +} + +static int rcar_gen2_phy_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct rcar_gen2_phy_driver *drv; + struct phy_provider *provider; + struct resource *res; + void __iomem *base; + struct clk *clk; + int i, j; + + if (!dev->of_node) { + dev_err(dev, + "This driver is required to be instantiated from device tree\n"); + return -EINVAL; + } + + clk = devm_clk_get(dev, "usbhs"); + if (IS_ERR(clk)) { + dev_err(dev, "Can't get USBHS clock\n"); + return PTR_ERR(clk); + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + base = devm_ioremap_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL); + if (!drv) + return -ENOMEM; + + spin_lock_init(&drv->lock); + + drv->clk = clk; + drv->base = base; + + drv->phys[0][0].select_mask = USBHS_UGCTRL2_USB0SEL; + drv->phys[0][0].select_value = USBHS_UGCTRL2_USB0SEL_PCI; + drv->phys[0][1].select_mask = USBHS_UGCTRL2_USB0SEL; + drv->phys[0][1].select_value = USBHS_UGCTRL2_USB0SEL_HS_USB; + drv->phys[2][0].select_mask = USBHS_UGCTRL2_USB2SEL; + drv->phys[2][0].select_value = USBHS_UGCTRL2_USB2SEL_PCI; + drv->phys[2][1].select_mask = USBHS_UGCTRL2_USB2SEL; + drv->phys[2][1].select_value = USBHS_UGCTRL2_USB2SEL_USB30; + + for (i = 0; i < NUM_USB_CHANNELS; i++) { + for (j = 0; j < 2; j++) { + struct rcar_gen2_phy *phy = &drv->phys[i][j]; + + phy->phy = devm_phy_create(dev, &rcar_gen2_phy_ops, + NULL); + if (IS_ERR(phy->phy)) { + dev_err(dev, + "Failed to create PHY for channel %d\n", + i); + return PTR_ERR(phy->phy); + } + + phy->drv = drv; + phy_set_drvdata(phy->phy, phy); + } + } + + provider = devm_of_phy_provider_register(dev, rcar_gen2_phy_xlate); + if (IS_ERR(provider)) { + dev_err(dev, "Failed to register PHY provider\n"); + return PTR_ERR(provider); + } + + dev_set_drvdata(dev, drv); + + return 0; +} + +static struct platform_driver rcar_gen2_phy_driver = { + .driver = { + .name = "phy_rcar_gen2", + .of_match_table = rcar_gen2_phy_match_table, + }, + .probe = rcar_gen2_phy_probe, +}; + +module_platform_driver(rcar_gen2_phy_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Renesas R-Car Gen2 PHY"); +MODULE_AUTHOR("Sergei Shtylyov ");