From patchwork Thu Aug 7 15:21:41 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Peter Griffin X-Patchwork-Id: 35051 Return-Path: X-Original-To: linaro@patches.linaro.org Delivered-To: linaro@patches.linaro.org Received: from mail-ig0-f197.google.com (mail-ig0-f197.google.com [209.85.213.197]) by ip-10-151-82-157.ec2.internal (Postfix) with ESMTPS id 7696221457 for ; Thu, 7 Aug 2014 15:22:41 +0000 (UTC) Received: by mail-ig0-f197.google.com with SMTP id r2sf16571536igi.4 for ; Thu, 07 Aug 2014 08:22:41 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:delivered-to:from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:sender:precedence:list-id :x-original-sender:x-original-authentication-results:mailing-list :list-post:list-help:list-archive:list-unsubscribe:content-type :content-transfer-encoding; bh=UJ9QEXYv9L1qLS94F6GiS2Gzr4qgdcm1IKH7Enof2dw=; b=cyxliPGR0NnbpKb2NnU4Of7njdmVaErmhknTjzDc/IyvcX5Vfm0vOTem9kmN/rsXTD UxC2zSsoCUy8QxHakzRQ6vnPnwmzFd5PuAfuijaLQL2m+K6lp9+05BIJxUfszVfXCFX3 AMTp7dfgoPwONTtROuk/pTMKWp9iJJro8VQ46agnv7BdRrB42Xx37jmHNKmhAlc9SLfG sZRGPE8Zd4SuVtBMIHZ1i/C74DPsHX7C+wnYt8KQoztJKDZwpGwQeVhHnGjjUteLu8le bBBNHQgLUUBcoefOPpTiC911r0vZexxrZKkPwOhFYYzGOYXH+Rq1yETyb9CYYm+bI/+w Piow== X-Gm-Message-State: ALoCoQkkUrDuB1mT1kVGen1hgkUt6livzIKCbRXKs/Y5tL02u14rybSiA4PQGqYJ0Njurmhs7uyZ X-Received: by 10.50.66.236 with SMTP id i12mr19892222igt.5.1407424961003; Thu, 07 Aug 2014 08:22:41 -0700 (PDT) X-BeenThere: patchwork-forward@linaro.org Received: by 10.140.91.40 with SMTP id y37ls175125qgd.2.gmail; Thu, 07 Aug 2014 08:22:40 -0700 (PDT) X-Received: by 10.52.26.173 with SMTP id m13mr1053818vdg.69.1407424960915; Thu, 07 Aug 2014 08:22:40 -0700 (PDT) Received: from mail-vc0-f176.google.com (mail-vc0-f176.google.com [209.85.220.176]) by mx.google.com with ESMTPS id c6si1890776vez.107.2014.08.07.08.22.40 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 07 Aug 2014 08:22:40 -0700 (PDT) Received-SPF: pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.220.176 as permitted sender) client-ip=209.85.220.176; Received: by mail-vc0-f176.google.com with SMTP id id10so6415758vcb.21 for ; Thu, 07 Aug 2014 08:22:40 -0700 (PDT) X-Received: by 10.52.94.108 with SMTP id db12mr2630525vdb.8.1407424960827; Thu, 07 Aug 2014 08:22:40 -0700 (PDT) X-Forwarded-To: patchwork-forward@linaro.org X-Forwarded-For: patch@linaro.org patchwork-forward@linaro.org Delivered-To: patch@linaro.org Received: by 10.221.37.5 with SMTP id tc5csp38838vcb; Thu, 7 Aug 2014 08:22:37 -0700 (PDT) X-Received: by 10.68.245.9 with SMTP id xk9mr18210222pbc.123.1407424955649; Thu, 07 Aug 2014 08:22:35 -0700 (PDT) Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id yj7si3789619pbc.13.2014.08.07.08.22.32 for ; Thu, 07 Aug 2014 08:22:35 -0700 (PDT) Received-SPF: none (google.com: linux-kernel-owner@vger.kernel.org does not designate permitted sender hosts) client-ip=209.132.180.67; Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932523AbaHGPW2 (ORCPT + 26 others); Thu, 7 Aug 2014 11:22:28 -0400 Received: from mail-we0-f170.google.com ([74.125.82.170]:52297 "EHLO mail-we0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932358AbaHGPWZ (ORCPT ); Thu, 7 Aug 2014 11:22:25 -0400 Received: by mail-we0-f170.google.com with SMTP id w62so4316800wes.29 for ; Thu, 07 Aug 2014 08:22:23 -0700 (PDT) X-Received: by 10.180.7.163 with SMTP id k3mr5875690wia.0.1407424943765; Thu, 07 Aug 2014 08:22:23 -0700 (PDT) Received: from localhost.localdomain (cpc14-aztw22-2-0-cust189.18-1.cable.virginm.net. [82.45.1.190]) by mx.google.com with ESMTPSA id wd7sm10568478wjc.36.2014.08.07.08.22.22 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 07 Aug 2014 08:22:22 -0700 (PDT) From: Peter Griffin To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, arnd@arndb.de, stern@rowland.harvard.edu, gregkh@linuxfoundation.org, srinivas.kandagatla@gmail.com, maxime.coquelin@st.com, patrice.chotard@st.com Cc: peter.griffin@linaro.org, lee.jones@linaro.org, linux-usb@vger.kernel.org, devicetree@vger.kernel.org Subject: [PATCH v4 2/5] usb: host: ohci-st: Add OHCI driver support for ST STB devices Date: Thu, 7 Aug 2014 16:21:41 +0100 Message-Id: <1407424904-19251-3-git-send-email-peter.griffin@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1407424904-19251-1-git-send-email-peter.griffin@linaro.org> References: <1407424904-19251-1-git-send-email-peter.griffin@linaro.org> MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: list List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: peter.griffin@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.220.176 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 List-Post: , List-Help: , List-Archive: List-Unsubscribe: , This patch adds the glue code required to ensure the on-chip OHCI controller works on STi consumer electronics SoC's from STMicroelectronics. It mainly manages the setting and enabling of the relevant clocks and manages the reset / power signals to the IP block. Signed-off-by: Peter Griffin --- drivers/usb/host/Kconfig | 8 ++ drivers/usb/host/Makefile | 1 + drivers/usb/host/ohci-st.c | 337 +++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 346 insertions(+) create mode 100644 drivers/usb/host/ohci-st.c diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig index 03314f8..4b577f6 100644 --- a/drivers/usb/host/Kconfig +++ b/drivers/usb/host/Kconfig @@ -753,6 +753,14 @@ config USB_HCD_SSB If unsure, say N. +config USB_HCD_ST + tristate "ST USB driver for ST SoC Series" + depends on ARCH_STI && OF + select GENERIC_PHY + help + Enable support for the on-chip OHCI & EHCI controller found on + STMicroelectronics consumer electronics SoC's. + config USB_HCD_TEST_MODE bool "HCD test mode support" ---help--- diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile index af89a90..df7e5ac 100644 --- a/drivers/usb/host/Makefile +++ b/drivers/usb/host/Makefile @@ -74,3 +74,4 @@ obj-$(CONFIG_USB_HCD_SSB) += ssb-hcd.o obj-$(CONFIG_USB_FUSBH200_HCD) += fusbh200-hcd.o obj-$(CONFIG_USB_FOTG210_HCD) += fotg210-hcd.o obj-$(CONFIG_USB_MAX3421_HCD) += max3421-hcd.o +obj-$(CONFIG_USB_HCD_ST) += ehci-st.o ohci-st.o diff --git a/drivers/usb/host/ohci-st.c b/drivers/usb/host/ohci-st.c new file mode 100644 index 0000000..263132a --- /dev/null +++ b/drivers/usb/host/ohci-st.c @@ -0,0 +1,337 @@ +/* + * ST OHCI driver + * + * Copyright (C) 2014 STMicroelectronics – All Rights Reserved + * + * Author: Peter Griffin + * + * Derived from ohci-platform.c + * + * 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 +#include +#include +#include +#include +#include + +#include "ohci.h" +#include "usb-st-common.h" + +#define DRIVER_DESC "OHCI STMicroelectronics driver" + +#define hcd_to_ohci_priv(h) ((struct st_platform_priv *)hcd_to_ohci(h)->priv) + +static const char hcd_name[] = "ohci-st"; + +static int st_ohci_platform_power_on(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct st_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk, ret; + + ret = reset_control_deassert(priv->pwr); + if (ret) + return ret; + + ret = reset_control_deassert(priv->rst); + if (ret) + goto err_assert_power; + + /* some SoCs don't have a dedicated 48Mhz clock, but those that do + need the rate to be explicitly set */ + if (priv->clk48) { + ret = clk_set_rate(priv->clk48, 48000000); + if (ret) + goto err_assert_reset; + } + + for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) { + ret = clk_prepare_enable(priv->clks[clk]); + if (ret) + goto err_disable_clks; + } + + ret = phy_init(priv->phy); + if (ret) + goto err_disable_clks; + + ret = phy_power_on(priv->phy); + if (ret) + goto err_exit_phy; + + return 0; + +err_exit_phy: + phy_exit(priv->phy); +err_disable_clks: + while (--clk >= 0) + clk_disable_unprepare(priv->clks[clk]); +err_assert_reset: + reset_control_assert(priv->rst); +err_assert_power: + reset_control_assert(priv->pwr); + + return ret; +} + +static void st_ohci_platform_power_off(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct st_platform_priv *priv = hcd_to_ohci_priv(hcd); + + int clk; + + reset_control_assert(priv->pwr); + + reset_control_assert(priv->rst); + + phy_power_off(priv->phy); + + phy_exit(priv->phy); + + for (clk = USB_MAX_CLKS - 1; clk >= 0; clk--) + if (priv->clks[clk]) + clk_disable_unprepare(priv->clks[clk]); +} + +static struct hc_driver __read_mostly ohci_platform_hc_driver; + +static const struct ohci_driver_overrides platform_overrides __initconst = { + .product_desc = "ST OHCI controller", + .extra_priv_size = sizeof(struct st_platform_priv), +}; + +static struct usb_ohci_pdata ohci_platform_defaults = { + .power_on = st_ohci_platform_power_on, + .power_suspend = st_ohci_platform_power_off, + .power_off = st_ohci_platform_power_off, +}; + +static int st_ohci_platform_probe(struct platform_device *dev) +{ + struct usb_hcd *hcd; + struct resource *res_mem; + struct usb_ohci_pdata *pdata = &ohci_platform_defaults; + struct st_platform_priv *priv; + struct ohci_hcd *ohci; + int err, irq, clk = 0; + + if (usb_disabled()) + return -ENODEV; + + irq = platform_get_irq(dev, 0); + if (irq < 0) { + dev_err(&dev->dev, "no irq provided"); + return irq; + } + + res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res_mem) { + dev_err(&dev->dev, "no memory resource provided"); + return -ENXIO; + } + + hcd = usb_create_hcd(&ohci_platform_hc_driver, &dev->dev, + dev_name(&dev->dev)); + if (!hcd) + return -ENOMEM; + + platform_set_drvdata(dev, hcd); + dev->dev.platform_data = pdata; + priv = hcd_to_ohci_priv(hcd); + ohci = hcd_to_ohci(hcd); + + priv->phy = devm_phy_get(&dev->dev, "usb"); + if (IS_ERR(priv->phy)) { + err = PTR_ERR(priv->phy); + goto err_put_hcd; + } + + for (clk = 0; clk < USB_MAX_CLKS; clk++) { + priv->clks[clk] = of_clk_get(dev->dev.of_node, clk); + if (IS_ERR(priv->clks[clk])) { + err = PTR_ERR(priv->clks[clk]); + if (err == -EPROBE_DEFER) + goto err_put_clks; + priv->clks[clk] = NULL; + break; + } + } + + /* some SoCs don't have a dedicated 48Mhz clock, but those that + do need the rate to be explicitly set */ + priv->clk48 = devm_clk_get(&dev->dev, "clk48"); + if (IS_ERR(priv->clk48)) { + dev_info(&dev->dev, "48MHz clk not found\n"); + priv->clk48 = NULL; + } + + priv->pwr = devm_reset_control_get_optional(&dev->dev, "power"); + if (IS_ERR(priv->pwr)) { + err = PTR_ERR(priv->pwr); + goto err_put_clks; + } + + priv->rst = devm_reset_control_get_optional(&dev->dev, "softreset"); + if (IS_ERR(priv->rst)) { + err = PTR_ERR(priv->rst); + goto err_put_clks; + } + + if (pdata->power_on) { + err = pdata->power_on(dev); + if (err < 0) + goto err_power; + } + + hcd->rsrc_start = res_mem->start; + hcd->rsrc_len = resource_size(res_mem); + + hcd->regs = devm_ioremap_resource(&dev->dev, res_mem); + if (IS_ERR(hcd->regs)) { + err = PTR_ERR(hcd->regs); + goto err_power; + } + err = usb_add_hcd(hcd, irq, IRQF_SHARED); + if (err) + goto err_power; + + device_wakeup_enable(hcd->self.controller); + + platform_set_drvdata(dev, hcd); + + return err; + +err_power: + if (pdata->power_off) + pdata->power_off(dev); + +err_put_clks: + while (--clk >= 0) + clk_put(priv->clks[clk]); +err_put_hcd: + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + + usb_put_hcd(hcd); + + return err; +} + +static int st_ohci_platform_remove(struct platform_device *dev) +{ + struct usb_hcd *hcd = platform_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev_get_platdata(&dev->dev); + struct st_platform_priv *priv = hcd_to_ohci_priv(hcd); + int clk; + + usb_remove_hcd(hcd); + + if (pdata->power_off) + pdata->power_off(dev); + + + for (clk = 0; clk < USB_MAX_CLKS && priv->clks[clk]; clk++) + clk_put(priv->clks[clk]); + + usb_put_hcd(hcd); + + if (pdata == &ohci_platform_defaults) + dev->dev.platform_data = NULL; + + return 0; +} + +#ifdef CONFIG_PM + +static int st_ohci_suspend(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev->platform_data; + struct platform_device *pdev = + container_of(dev, struct platform_device, dev); + bool do_wakeup = device_may_wakeup(dev); + int ret; + + ret = ohci_suspend(hcd, do_wakeup); + if (ret) + return ret; + + if (pdata->power_suspend) + pdata->power_suspend(pdev); + + return ret; +} + +static int st_ohci_resume(struct device *dev) +{ + struct usb_hcd *hcd = dev_get_drvdata(dev); + struct usb_ohci_pdata *pdata = dev_get_platdata(dev); + struct platform_device *pdev = + container_of(dev, struct platform_device, dev); + int err; + + if (pdata->power_on) { + err = pdata->power_on(pdev); + if (err < 0) + return err; + } + + ohci_resume(hcd, false); + return 0; +} + +#endif /* CONFIG_PM */ + +static SIMPLE_DEV_PM_OPS(st_ohci_pm_ops, st_ohci_suspend, st_ohci_resume); + +static const struct of_device_id st_ohci_platform_ids[] = { + { .compatible = "st,st-ohci-300x", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, st_ohci_platform_ids); + +static struct platform_driver ohci_platform_driver = { + .probe = st_ohci_platform_probe, + .remove = st_ohci_platform_remove, + .shutdown = usb_hcd_platform_shutdown, + .driver = { + .name = "st-ohci", + .pm = &st_ohci_pm_ops, + .of_match_table = st_ohci_platform_ids, + } +}; + +static int __init ohci_platform_init(void) +{ + if (usb_disabled()) + return -ENODEV; + + pr_info("%s: " DRIVER_DESC "\n", hcd_name); + + ohci_init_driver(&ohci_platform_hc_driver, &platform_overrides); + return platform_driver_register(&ohci_platform_driver); +} +module_init(ohci_platform_init); + +static void __exit ohci_platform_cleanup(void) +{ + platform_driver_unregister(&ohci_platform_driver); +} +module_exit(ohci_platform_cleanup); + +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_AUTHOR("Peter Griffin "); +MODULE_LICENSE("GPL");