From patchwork Tue Feb 7 13:55:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Abel Vesa X-Patchwork-Id: 651335 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87A38C636CD for ; Tue, 7 Feb 2023 13:57:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232267AbjBGN5J (ORCPT ); Tue, 7 Feb 2023 08:57:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232279AbjBGN4o (ORCPT ); Tue, 7 Feb 2023 08:56:44 -0500 Received: from mail-wr1-x433.google.com (mail-wr1-x433.google.com [IPv6:2a00:1450:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DF5F439BAB for ; Tue, 7 Feb 2023 05:56:16 -0800 (PST) Received: by mail-wr1-x433.google.com with SMTP id k13so6226130wrh.8 for ; Tue, 07 Feb 2023 05:56:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=wknXjDaGXH+LX2K/TaaG7FdKylzkWnpWRhGp8pLhtGE=; b=CpsnTxFsn5qi50XjG1iAOSliAdXfjTiEkhuSOfCEbyx7GMkKl8B/UZ1xReJQgiESTn csRYg0SnxBQvUSDQHU2Pgt+yY2n96NOzDe7KoDCItV72Uc8gx2yL5ZOnqbIFMSP0vzv1 BFIuSY/02m/CzNIw7NwI5Y7yczO4eOR1PC0rk74e8RVSTy4HjprioE4lPZC4JZtE5nU3 Wy23uiE68t6fMEcTbbyHFTs0LP6ZqJp+bwtC0og02noA80LOEXZttPWR+nG7hiUe0UfY 7oDacN0uqd2NfdXexDl2gGA4v1NSPzU/3Vqx8PcPd4cPJKNXQiGywwKisBHrUlrZkZRO iXpQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=wknXjDaGXH+LX2K/TaaG7FdKylzkWnpWRhGp8pLhtGE=; b=OQ+5YOGSwlD7DSVaMHkdyfUUna5xY8r+A7myr5Ss7znMze4+AfxFJ3cbiEq2pnzue9 fuqYQWXnDkVYcNgwZKXj9n/fNIdUL6VKepPedGs0sj+1XXA0x5y7x+ovaEYVsfO2+001 ZweZLy4msgy9+7jGCtpITxzqZeM5PsVU5XOKNbHsU8n95j+5I38L81oV1OpOZiD+8SVN 8+vzhRTVCpZV9cFe6gJBUjijjWPYsBdy9zOf5lWwteEb8JcBOM1PsKeji+9/GI3U/Xjn VrIODLNz/KDsjKBL8xPr0vrnkgPhwfMiqGfv7PkO/Jxav7vu5Jqzi7E0a8Z3jTC6P7BO SXuw== X-Gm-Message-State: AO0yUKXqtkos7i1pMHjplP5MgaNS+94/vZTHNQffpMsqLmIDsLrBgkkN 7VKRhD973YFCbCjspWc93dG+lA== X-Google-Smtp-Source: AK7set+oRWPLZzVSZcYAw1/0txRXToUbZSBz46U8JnoNq2rVlETdGipEGRtWjRCQT7H1y/bd8csvWg== X-Received: by 2002:adf:f749:0:b0:2bd:f71a:5b32 with SMTP id z9-20020adff749000000b002bdf71a5b32mr2772989wrp.58.1675778160430; Tue, 07 Feb 2023 05:56:00 -0800 (PST) Received: from hackbox.lan ([94.52.112.99]) by smtp.gmail.com with ESMTPSA id p10-20020a5d59aa000000b002be5401ef5fsm11611312wrr.39.2023.02.07.05.55.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 07 Feb 2023 05:56:00 -0800 (PST) From: Abel Vesa To: Andy Gross , Bjorn Andersson , Konrad Dybcio , Lee Jones , Rob Herring , Krzysztof Kozlowski , "vkoul@kernel.org" , Kishon Vijay Abraham I , Johan Hovold Cc: linux-arm-msm@vger.kernel.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, Linux Kernel Mailing List Subject: [PATCH v4 4/7] phy: qcom: Add QCOM SNPS eUSB2 repeater driver Date: Tue, 7 Feb 2023 15:55:48 +0200 Message-Id: <20230207135551.1418637-5-abel.vesa@linaro.org> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230207135551.1418637-1-abel.vesa@linaro.org> References: <20230207135551.1418637-1-abel.vesa@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org PM8550B contains a eUSB2 repeater used for making the eUSB2 from SM8550 USB 2.0 compliant. This can be modelled SW-wise as a Phy. So add a new phy driver for it. Signed-off-by: Abel Vesa --- The v3 (rfc) is here: https://lore.kernel.org/all/20230202133816.4026990-5-abel.vesa@linaro.org/ Changes since v3: * fixed all indentation issues and dropped a few blank lines to pass checkpatch * dropped shift defines as they were not used * dropped the repeater_mode as it was not used * dropped the of_node_get and of_node_put for of_node * dropped the comment related to regulators in eusb2_repeater_cfg, like Vinod suggested * dropped the initialization of ret in eusb2_repeater_init drivers/phy/qualcomm/Kconfig | 9 + drivers/phy/qualcomm/Makefile | 1 + .../phy/qualcomm/phy-qcom-eusb2-repeater.c | 259 ++++++++++++++++++ 3 files changed, 269 insertions(+) create mode 100644 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c diff --git a/drivers/phy/qualcomm/Kconfig b/drivers/phy/qualcomm/Kconfig index 513322cdf83c..4850d48f31fa 100644 --- a/drivers/phy/qualcomm/Kconfig +++ b/drivers/phy/qualcomm/Kconfig @@ -121,6 +121,15 @@ config PHY_QCOM_SNPS_EUSB2 chipsets. The PHY is paired with a Synopsys DWC3 USB controller on Qualcomm SOCs. +config PHY_QCOM_EUSB2_REPEATER + tristate "Qualcomm SNPS eUSB2 Repeater Driver" + depends on OF && (ARCH_QCOM || COMPILE_TEST) + select GENERIC_PHY + help + Enable support for the USB high-speed SNPS eUSB2 repeater on Qualcomm + PMICs. The repeater is paired with a Synopsys eUSB2 Phy + on Qualcomm SOCs. + config PHY_QCOM_USB_HS tristate "Qualcomm USB HS PHY module" depends on USB_ULPI_BUS diff --git a/drivers/phy/qualcomm/Makefile b/drivers/phy/qualcomm/Makefile index b2c01665622b..de3dc9ccf067 100644 --- a/drivers/phy/qualcomm/Makefile +++ b/drivers/phy/qualcomm/Makefile @@ -14,6 +14,7 @@ obj-$(CONFIG_PHY_QCOM_QMP_USB) += phy-qcom-qmp-usb.o obj-$(CONFIG_PHY_QCOM_QUSB2) += phy-qcom-qusb2.o obj-$(CONFIG_PHY_QCOM_SNPS_EUSB2) += phy-qcom-snps-eusb2.o +obj-$(CONFIG_PHY_QCOM_EUSB2_REPEATER) += phy-qcom-eusb2-repeater.o obj-$(CONFIG_PHY_QCOM_USB_HS) += phy-qcom-usb-hs.o obj-$(CONFIG_PHY_QCOM_USB_HSIC) += phy-qcom-usb-hsic.o obj-$(CONFIG_PHY_QCOM_USB_HS_28NM) += phy-qcom-usb-hs-28nm.o diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c new file mode 100644 index 000000000000..3f265ac2df20 --- /dev/null +++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c @@ -0,0 +1,259 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2023, Linaro Limited + */ + +#include +#include +#include +#include +#include +#include +#include + +/* eUSB2 status registers */ +#define EUSB2_RPTR_STATUS 0x08 +#define RPTR_OK BIT(7) + +/* eUSB2 control registers */ +#define EUSB2_EN_CTL1 0x46 +#define EUSB2_RPTR_EN BIT(7) + +#define EUSB2_FORCE_EN_5 0xe8 +#define F_CLK_19P2M_EN BIT(6) + +#define EUSB2_FORCE_VAL_5 0xeD +#define V_CLK_19P2M_EN BIT(6) + +#define EUSB2_TUNE_IUSB2 0x51 +#define EUSB2_TUNE_SQUELCH_U 0x54 +#define EUSB2_TUNE_USB2_PREEM 0x57 + +#define QCOM_EUSB2_REPEATER_INIT_CFG(o, v) \ + { \ + .offset = o, \ + .val = v, \ + } + +struct eusb2_repeater_init_tbl { + unsigned int offset; + unsigned int val; +}; + +struct eusb2_repeater_cfg { + const struct eusb2_repeater_init_tbl *init_tbl; + int init_tbl_num; + const char * const *vreg_list; + int num_vregs; +}; + +struct eusb2_repeater { + struct device *dev; + struct regmap *regmap; + struct phy *phy; + struct regulator_bulk_data *vregs; + const struct eusb2_repeater_cfg *cfg; + u16 base; + enum phy_mode mode; +}; + +static const char * const pm8550b_vreg_l[] = { + "vdd18", "vdd3", +}; + +static const struct eusb2_repeater_init_tbl pm8550b_init_tbl[] = { + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_IUSB2, 0x8), + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_SQUELCH_U, 0x3), + QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_USB2_PREEM, 0x5), +}; + +static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = { + .init_tbl = pm8550b_init_tbl, + .init_tbl_num = ARRAY_SIZE(pm8550b_init_tbl), + .vreg_list = pm8550b_vreg_l, + .num_vregs = ARRAY_SIZE(pm8550b_vreg_l), +}; + +static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr) +{ + int num = rptr->cfg->num_vregs; + struct device *dev = rptr->dev; + int i; + + rptr->vregs = devm_kcalloc(dev, num, sizeof(*rptr->vregs), GFP_KERNEL); + if (!rptr->vregs) + return -ENOMEM; + + for (i = 0; i < num; i++) + rptr->vregs[i].supply = rptr->cfg->vreg_list[i]; + + return devm_regulator_bulk_get(dev, num, rptr->vregs); +} + +static int eusb2_repeater_init(struct phy *phy) +{ + struct eusb2_repeater *rptr = phy_get_drvdata(phy); + const struct eusb2_repeater_init_tbl *init_tbl = rptr->cfg->init_tbl; + int num = rptr->cfg->init_tbl_num; + u32 val; + int ret; + int i; + + ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs); + if (ret) + return ret; + + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_EN_CTL1, + EUSB2_RPTR_EN, EUSB2_RPTR_EN); + + for (i = 0; i < num; i++) + regmap_update_bits(rptr->regmap, + rptr->base + init_tbl[i].offset, + init_tbl[i].val, init_tbl[i].val); + + ret = regmap_read_poll_timeout(rptr->regmap, + rptr->base + EUSB2_RPTR_STATUS, val, + val & RPTR_OK, 10, 5); + if (ret) + dev_err(rptr->dev, "initialization timed-out\n"); + + return ret; +} + +static int eusb2_repeater_set_mode(struct phy *phy, + enum phy_mode mode, int submode) +{ + struct eusb2_repeater *rptr = phy_get_drvdata(phy); + + switch (mode) { + case PHY_MODE_USB_HOST: + /* + * CM.Lx is prohibited when repeater is already into Lx state as + * per eUSB 1.2 Spec. Below implement software workaround until + * PHY and controller is fixing seen observation. + */ + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5, + F_CLK_19P2M_EN, F_CLK_19P2M_EN); + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5, + V_CLK_19P2M_EN, V_CLK_19P2M_EN); + break; + case PHY_MODE_USB_DEVICE: + /* + * In device mode clear host mode related workaround as there + * is no repeater reset available, and enable/disable of + * repeater doesn't clear previous value due to shared + * regulators (say host <-> device mode switch). + */ + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5, + F_CLK_19P2M_EN, 0); + regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5, + V_CLK_19P2M_EN, 0); + break; + default: + return -EINVAL; + } + + return 0; +} + +static int eusb2_repeater_exit(struct phy *phy) +{ + struct eusb2_repeater *rptr = phy_get_drvdata(phy); + + return regulator_bulk_disable(rptr->cfg->num_vregs, rptr->vregs); +} + +static const struct phy_ops eusb2_repeater_ops = { + .init = eusb2_repeater_init, + .exit = eusb2_repeater_exit, + .set_mode = eusb2_repeater_set_mode, + .owner = THIS_MODULE, +}; + +static int eusb2_repeater_probe(struct platform_device *pdev) +{ + struct eusb2_repeater *rptr; + struct device *dev = &pdev->dev; + struct phy_provider *phy_provider; + struct device_node *np = dev->of_node; + u32 res; + int ret; + + rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL); + if (!rptr) + return -ENOMEM; + + rptr->dev = dev; + dev_set_drvdata(dev, rptr); + + rptr->cfg = of_device_get_match_data(dev); + if (!rptr->cfg) + return -EINVAL; + + rptr->regmap = dev_get_regmap(dev->parent, NULL); + if (!rptr->regmap) + return -ENODEV; + + ret = of_property_read_u32(np, "reg", &res); + if (ret < 0) + return ret; + + rptr->base = res; + + ret = eusb2_repeater_init_vregs(rptr); + if (ret < 0) { + dev_err(dev, "unable to get supplies\n"); + return ret; + } + + rptr->phy = devm_phy_create(dev, np, &eusb2_repeater_ops); + if (IS_ERR(rptr->phy)) { + dev_err(dev, "failed to create PHY: %d\n", ret); + return PTR_ERR(rptr->phy); + } + + phy_set_drvdata(rptr->phy, rptr); + + 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, "Registered Qcom-eUSB2 repeater\n"); + + return 0; +} + +static int eusb2_repeater_remove(struct platform_device *pdev) +{ + struct eusb2_repeater *rptr = platform_get_drvdata(pdev); + + if (!rptr) + return 0; + + eusb2_repeater_exit(rptr->phy); + + return 0; +} + +static const struct of_device_id eusb2_repeater_of_match_table[] = { + { + .compatible = "qcom,pm8550b-eusb2-repeater", + .data = &pm8550b_eusb2_cfg, + }, + { }, +}; +MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table); + +static struct platform_driver eusb2_repeater_driver = { + .probe = eusb2_repeater_probe, + .remove = eusb2_repeater_remove, + .driver = { + .name = "qcom-eusb2-repeater", + .of_match_table = eusb2_repeater_of_match_table, + }, +}; + +module_platform_driver(eusb2_repeater_driver); + +MODULE_DESCRIPTION("Qualcomm PMIC eUSB2 Repeater driver"); +MODULE_LICENSE("GPL");