From patchwork Tue Sep 9 09:00:15 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Peter Griffin X-Patchwork-Id: 4866961 Return-Path: X-Original-To: patchwork-linux-arm@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 285649F32E for ; Tue, 9 Sep 2014 09:03:07 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id AAA5920145 for ; Tue, 9 Sep 2014 09:03:05 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 26DE3200F2 for ; Tue, 9 Sep 2014 09:03:04 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XRHIO-00084n-Ir; Tue, 09 Sep 2014 09:01:04 +0000 Received: from mail-wg0-f48.google.com ([74.125.82.48]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XRHII-0007xG-W0 for linux-arm-kernel@lists.infradead.org; Tue, 09 Sep 2014 09:01:00 +0000 Received: by mail-wg0-f48.google.com with SMTP id m15so2672239wgh.31 for ; Tue, 09 Sep 2014 02:00:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Q7wh+qJMdneOQqIX8ZCyj10XuA20IOHHsyAaoH9oJhs=; b=kQX9YOCmuC1H75AT+04myXApngLMwQRkslkn/QBRMKc52110ZwK8yHuVJRuz9ogYxo TKFBJSDGB3k7N6lP4iKVFVxtF/hSVvStCm1bAamwFmYzWtvDOzCzz7/ExKMUY0UObhqi GBa5+44eAztf+Qv+CUf5mMFoybnJJOq66uP9imAB9ojozH0XqcisNOry6W92nvJGhG/7 Gd2wV21ABjaPW2BGbqOFrJ6XdmUE/nyCkKtheEcLvhNMHh3Wi7N2mmFPZtuWcLMXWsln 5IH7HphGfroAdwNctTjwxGqdcrdExjhJEynUHYXM2fzNpvltcBWWraJ+BFXZce6H7nPN LXQw== X-Gm-Message-State: ALoCoQn9/ZnmZmC+Injf+wSBce/8gaLAmQ0JHT0arCrKyTc/redTpk2GHC0oRzsCSNh76lvgbpx7 X-Received: by 10.194.243.230 with SMTP id xb6mr10864215wjc.100.1410253236240; Tue, 09 Sep 2014 02:00:36 -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 n5sm14060076wja.38.2014.09.09.02.00.34 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 09 Sep 2014 02:00:35 -0700 (PDT) From: Peter Griffin To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kishon@ti.com, srinivas.kandagatla@gmail.com, maxime.coquelin@st.com, patrice.chotard@st.com Subject: [PATCH v2 1/4] phy: phy-stih407-usb: Add usb picoPHY driver found on stih407 SoC family Date: Tue, 9 Sep 2014 10:00:15 +0100 Message-Id: <1410253218-18318-2-git-send-email-peter.griffin@linaro.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1410253218-18318-1-git-send-email-peter.griffin@linaro.org> References: <1410253218-18318-1-git-send-email-peter.griffin@linaro.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140909_020059_354383_A9AAC2CB X-CRM114-Status: GOOD ( 18.88 ) X-Spam-Score: -0.7 (/) Cc: peter.griffin@linaro.org, peppe.cavallaro@st.com, lee.jones@linaro.org, devicetree@vger.kernel.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, 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 is the generic phy driver for the picoPHY ports used by the USB2 and USB3 Host controllers when controlling usb2/1.1 devices. It is found on STiH407 SoC family from STMicroelectronics. Signed-off-by: Giuseppe Cavallaro Signed-off-by: Peter Griffin --- drivers/phy/Kconfig | 8 ++ drivers/phy/Makefile | 2 + drivers/phy/phy-stih407-usb.c | 185 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 195 insertions(+) create mode 100644 drivers/phy/phy-stih407-usb.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index 0dd7427..58018f7 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -230,4 +230,12 @@ config PHY_XGENE help This option enables support for APM X-Gene SoC multi-purpose PHY. +config PHY_STIH407_USB + tristate "STMicroelectronics USB2 picoPHY driver for STiH407 family" + depends on ARCH_STI + depends on GENERIC_PHY + help + Enable this support to enable the picoPHY device used by USB2 + and USB3 controllers on STMicroelectronics STiH407 SoC families. + endmenu diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 95c69ed..c82ac59 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -28,3 +28,5 @@ obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA) += phy-qcom-ipq806x-sata.o obj-$(CONFIG_PHY_ST_SPEAR1310_MIPHY) += phy-spear1310-miphy.o obj-$(CONFIG_PHY_ST_SPEAR1340_MIPHY) += phy-spear1340-miphy.o obj-$(CONFIG_PHY_XGENE) += phy-xgene.o +obj-$(CONFIG_PHY_STIH407_USB) += phy-stih407-usb.o + diff --git a/drivers/phy/phy-stih407-usb.c b/drivers/phy/phy-stih407-usb.c new file mode 100644 index 0000000..8019e3b --- /dev/null +++ b/drivers/phy/phy-stih407-usb.c @@ -0,0 +1,185 @@ +/* + * Copyright (C) 2014 STMicroelectronics + * + * STMicroelectronics Generic PHY driver for STiH407 USB2. + * + * Author: Giuseppe Cavallaro + * + * 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 + +/* Default PHY_SEL and REFCLKSEL configuration */ +#define STIH407_USB_PICOPHY_CTRL_PORT_CONF 0x6 +#define STIH407_USB_PICOPHY_CTRL_PORT_MASK 0x1f + +/* ports parameters overriding */ +#define STIH407_USB_PICOPHY_PARAM_DEF 0x39a4dc +#define STIH407_USB_PICOPHY_PARAM_MASK 0xffffffff + +struct stih407_usb2_picophy { + struct phy *phy; + struct regmap *regmap; + struct device *dev; + struct reset_control *rstc; + struct reset_control *rstport; + int ctrl; + int param; +}; + +static int stih407_usb2_pico_ctrl(struct stih407_usb2_picophy *phy_dev) +{ + reset_control_deassert(phy_dev->rstc); + + return regmap_update_bits(phy_dev->regmap, phy_dev->ctrl, + STIH407_USB_PICOPHY_CTRL_PORT_MASK, + STIH407_USB_PICOPHY_CTRL_PORT_CONF); +} + +static int stih407_usb2_init_port(struct phy *phy) +{ + int ret; + struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy); + + stih407_usb2_pico_ctrl(phy_dev); + + ret = regmap_update_bits(phy_dev->regmap, + phy_dev->param, + STIH407_USB_PICOPHY_PARAM_MASK, + STIH407_USB_PICOPHY_PARAM_DEF); + if (ret) + return ret; + + return reset_control_deassert(phy_dev->rstport); +} + +static int stih407_usb2_exit_port(struct phy *phy) +{ + struct stih407_usb2_picophy *phy_dev = phy_get_drvdata(phy); + + /* + * Only port reset is asserted, phy global reset is kept untouched + * as other ports may still be active. When all ports are in reset + * state, assumption is made that power will be cut off on the phy, in + * case of suspend for instance. Theoretically, asserting individual + * reset (like here) or global reset should be equivalent. + */ + return reset_control_assert(phy_dev->rstport); +} + +static const struct phy_ops stih407_usb2_picophy_data = { + .init = stih407_usb2_init_port, + .exit = stih407_usb2_exit_port, + .owner = THIS_MODULE, +}; + +static const struct of_device_id stih407_usb2_picophy_of_match[]; + +static int stih407_usb2_picophy_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct stih407_usb2_picophy *phy_dev; + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + struct phy_provider *phy_provider; + struct phy *phy; + struct resource *res; + + phy_dev = devm_kzalloc(dev, sizeof(*phy_dev), GFP_KERNEL); + if (!phy_dev) + return -ENOMEM; + + match = of_match_device(stih407_usb2_picophy_of_match, dev); + if (!match) + return -ENODEV; + + phy_dev->dev = dev; + dev_set_drvdata(dev, phy_dev); + + phy_dev->rstc = devm_reset_control_get(dev, "global"); + if (IS_ERR(phy_dev->rstc)) { + dev_err(dev, "failed to ctrl picoPHY reset\n"); + return PTR_ERR(phy_dev->rstc); + } + + phy_dev->rstport = devm_reset_control_get(dev, "port"); + if (IS_ERR(phy_dev->rstport)) { + dev_err(dev, "failed to ctrl picoPHY reset\n"); + return PTR_ERR(phy_dev->rstport); + } + + /* Reset port by default: only deassert it in phy init */ + reset_control_assert(phy_dev->rstport); + + phy_dev->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); + if (IS_ERR(phy_dev->regmap)) { + dev_err(dev, "No syscfg phandle specified\n"); + return PTR_ERR(phy_dev->regmap); + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ctrl"); + if (!res) { + dev_err(dev, "No ctrl reg found\n"); + return -ENXIO; + } + phy_dev->ctrl = res->start; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "param"); + if (!res) { + dev_err(dev, "No param reg found\n"); + return -ENXIO; + } + phy_dev->param = res->start; + + phy = devm_phy_create(dev, NULL, match->data, NULL); + if (IS_ERR(phy)) { + dev_err(dev, "failed to create Display Port PHY\n"); + return PTR_ERR(phy); + } + + phy_dev->phy = phy; + phy_set_drvdata(phy, phy_dev); + + phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate); + if (IS_ERR(phy_provider)) + return PTR_ERR(phy_provider); + + dev_info(dev, "STiH407 USB Generic picoPHY driver probed!"); + + return 0; +} + +static const struct of_device_id stih407_usb2_picophy_of_match[] = { + { .compatible = "st,stih407-usb2-phy", + .data = &stih407_usb2_picophy_data }, + { /*sentinel */ }, +}; + +MODULE_DEVICE_TABLE(of, stih407_usb2_picophy_of_match); + +static struct platform_driver stih407_usb2_picophy_driver = { + .probe = stih407_usb2_picophy_probe, + .driver = { + .name = "stih407-usb-genphy", + .of_match_table = stih407_usb2_picophy_of_match, + } +}; + +module_platform_driver(stih407_usb2_picophy_driver); + +MODULE_AUTHOR("Giuseppe Cavallaro "); +MODULE_DESCRIPTION("STMicroelectronics Generic picoPHY driver for STiH407"); +MODULE_LICENSE("GPL v2");