From patchwork Wed Apr 29 11:07:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Robert Marko X-Patchwork-Id: 189391 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E397C8300A for ; Wed, 29 Apr 2020 11:08:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DE27A2074A for ; Wed, 29 Apr 2020 11:08:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=sartura-hr.20150623.gappssmtp.com header.i=@sartura-hr.20150623.gappssmtp.com header.b="D3L8bEZq" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726737AbgD2LHt (ORCPT ); Wed, 29 Apr 2020 07:07:49 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57858 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1726676AbgD2LHs (ORCPT ); Wed, 29 Apr 2020 07:07:48 -0400 Received: from mail-wm1-x343.google.com (mail-wm1-x343.google.com [IPv6:2a00:1450:4864:20::343]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7F942C035494 for ; Wed, 29 Apr 2020 04:07:48 -0700 (PDT) Received: by mail-wm1-x343.google.com with SMTP id u127so1559104wmg.1 for ; Wed, 29 Apr 2020 04:07:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sartura-hr.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=4IFZd1qXcd87Y4Kb8dlFeUJd/ZFzdcOLb7Q8itu4OPU=; b=D3L8bEZq35GXiY+CGCTabQG5WVKNnR/jHfXq4xPmKv4nEIe+nGiXOADk1co/R8dC3/ 1tj/zykIp2MJCGcYVTAed456XuNqBAVxEArZ6aEp/e3VtTgH0+0URkafCXq9pnSSs9Kx xHE8U8dGhSvF78hbZYmROaAq8ZArXBtHq1mcZuupyw0WaNfKiIa9+uAZVS/czB/yOxaR osrhfUw2mgtWfisVNmaq6FTOrNBTejATqgXp4IUgOrXiqjOs/NYZEns3lj988pmcA8iT LlQlq2+5S4caH8046OXHma8VPF45ce3JhXGeY3XJf4lUVds2qB+oK5ZGu7Fe4dZio6lM s9aA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=4IFZd1qXcd87Y4Kb8dlFeUJd/ZFzdcOLb7Q8itu4OPU=; b=BDMIfe4mvuC7UvG9bDby1qNaElqLDaNDEolyujoF6dV/c0Qjwn9srYjYuL1xRDh1zv I2A/J76KA5bgNi/dfyYiL1QSisOhDEvu2UincH0UlmGXyu72r+TDsbKyHEOEioUpEQgb 9dohqFl8ij5DydQfEbR0iokRR1fJ1pRX2UugZj2tjYdhLj5vpoFU7xDwGq98CO9WkCJQ 1uNAtzURJKBnguaq5MwALaqve5hkHlREKP4lUAm4+8CUlAFwwEwgbFncb75laZ8e32A7 82/97b+PcTwYxWf0BSfNbDiVlIyY+6ztuq9s1tbBuCoZa1Vuc1RG4ONlkuzHslvd9AhC ghGA== X-Gm-Message-State: AGi0PuYhmJLxqOHDmDfJz2xI5PWHl2jenKUVKMQGu2X5Izw8aFrnPycu OvFOdjL5VhsNZ/s2RzYktCq4qg== X-Google-Smtp-Source: APiQypKT56YTOn878157tmKnVePrI/0BlCP6Nd2HCXAppKtDJ02Ytcb6hEBQzRtPbqngTRGbd6qi6w== X-Received: by 2002:a1c:7c13:: with SMTP id x19mr2629862wmc.124.1588158467160; Wed, 29 Apr 2020 04:07:47 -0700 (PDT) Received: from localhost.localdomain ([2a0e:b107:830:0:47e5:c676:4796:5818]) by smtp.googlemail.com with ESMTPSA id u7sm7679963wmg.41.2020.04.29.04.07.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 29 Apr 2020 04:07:46 -0700 (PDT) From: Robert Marko To: andrew@lunn.ch, f.fainelli@gmail.com, hkallweit1@gmail.com, linux@armlinux.org.uk, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, agross@kernel.org, bjorn.andersson@linaro.org, robh+dt@kernel.org, mark.rutland@arm.com, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org Cc: Robert Marko , Christian Lamparter , Luka Perkov Subject: [PATCH net-next v4 1/3] net: phy: mdio: add IPQ4019 MDIO driver Date: Wed, 29 Apr 2020 13:07:25 +0200 Message-Id: <20200429110726.448625-2-robert.marko@sartura.hr> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200429110726.448625-1-robert.marko@sartura.hr> References: <20200429110726.448625-1-robert.marko@sartura.hr> MIME-Version: 1.0 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org This patch adds the driver for the MDIO interface inside of Qualcomm IPQ40xx series SoC-s. Signed-off-by: Christian Lamparter Signed-off-by: Robert Marko Reviewed-by: Andrew Lunn Reviewed-by: Florian Fainelli Cc: Luka Perkov --- Changes from v3 to v4: * Change compatible and references to IPQ4019 per Rob Herrings suggestion Changes from v2 to v3: * Rename registers * Remove unnecessary variable initialisations * Switch to readl_poll_timeout() instead of custom solution * Drop unused header Changes from v1 to v2: * Remove magic default value * Remove lockdep_assert_held * Add C45 check * Simplify the driver * Drop device and mii_bus structs from private struct * Use devm_mdiobus_alloc_size() drivers/net/phy/Kconfig | 7 ++ drivers/net/phy/Makefile | 1 + drivers/net/phy/mdio-ipq4019.c | 160 +++++++++++++++++++++++++++++++++ 3 files changed, 168 insertions(+) create mode 100644 drivers/net/phy/mdio-ipq4019.c diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 3fa33d27eeba..6693df126861 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -157,6 +157,13 @@ config MDIO_I2C This is library mode. +config MDIO_IPQ4019 + tristate "Qualcomm IPQ4019 MDIO interface support" + depends on HAS_IOMEM && OF_MDIO + help + This driver supports the MDIO interface found in Qualcomm + IPQ40xx series Soc-s. + config MDIO_IPQ8064 tristate "Qualcomm IPQ8064 MDIO interface support" depends on HAS_IOMEM && OF_MDIO diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile index 2f5c7093a65b..12e0d0b137b9 100644 --- a/drivers/net/phy/Makefile +++ b/drivers/net/phy/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_MDIO_CAVIUM) += mdio-cavium.o obj-$(CONFIG_MDIO_GPIO) += mdio-gpio.o obj-$(CONFIG_MDIO_HISI_FEMAC) += mdio-hisi-femac.o obj-$(CONFIG_MDIO_I2C) += mdio-i2c.o +obj-$(CONFIG_MDIO_IPQ4019) += mdio-ipq4019.o obj-$(CONFIG_MDIO_IPQ8064) += mdio-ipq8064.o obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-mscc-miim.o diff --git a/drivers/net/phy/mdio-ipq4019.c b/drivers/net/phy/mdio-ipq4019.c new file mode 100644 index 000000000000..f1f25489e134 --- /dev/null +++ b/drivers/net/phy/mdio-ipq4019.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* Copyright (c) 2015, The Linux Foundation. All rights reserved. */ +/* Copyright (c) 2020 Sartura Ltd. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define MDIO_ADDR_REG 0x44 +#define MDIO_DATA_WRITE_REG 0x48 +#define MDIO_DATA_READ_REG 0x4c +#define MDIO_CMD_REG 0x50 +#define MDIO_CMD_ACCESS_BUSY BIT(16) +#define MDIO_CMD_ACCESS_START BIT(8) +#define MDIO_CMD_ACCESS_CODE_READ 0 +#define MDIO_CMD_ACCESS_CODE_WRITE 1 + +#define ipq4019_MDIO_TIMEOUT 10000 +#define ipq4019_MDIO_SLEEP 10 + +struct ipq4019_mdio_data { + void __iomem *membase; +}; + +static int ipq4019_mdio_wait_busy(struct mii_bus *bus) +{ + struct ipq4019_mdio_data *priv = bus->priv; + unsigned int busy; + + return readl_poll_timeout(priv->membase + MDIO_CMD_REG, busy, + (busy & MDIO_CMD_ACCESS_BUSY) == 0, + ipq4019_MDIO_SLEEP, ipq4019_MDIO_TIMEOUT); +} + +static int ipq4019_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct ipq4019_mdio_data *priv = bus->priv; + unsigned int cmd; + + /* Reject clause 45 */ + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + if (ipq4019_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + /* issue the phy address and reg */ + writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG); + + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_READ; + + /* issue read command */ + writel(cmd, priv->membase + MDIO_CMD_REG); + + /* Wait read complete */ + if (ipq4019_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + /* Read and return data */ + return readl(priv->membase + MDIO_DATA_READ_REG); +} + +static int ipq4019_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct ipq4019_mdio_data *priv = bus->priv; + unsigned int cmd; + + /* Reject clause 45 */ + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + if (ipq4019_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + /* issue the phy address and reg */ + writel((mii_id << 8) | regnum, priv->membase + MDIO_ADDR_REG); + + /* issue write data */ + writel(value, priv->membase + MDIO_DATA_WRITE_REG); + + cmd = MDIO_CMD_ACCESS_START | MDIO_CMD_ACCESS_CODE_WRITE; + /* issue write command */ + writel(cmd, priv->membase + MDIO_CMD_REG); + + /* Wait write complete */ + if (ipq4019_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + return 0; +} + +static int ipq4019_mdio_probe(struct platform_device *pdev) +{ + struct ipq4019_mdio_data *priv; + struct mii_bus *bus; + int ret; + + bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv)); + if (!bus) + return -ENOMEM; + + priv = bus->priv; + + priv->membase = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(priv->membase)) + return PTR_ERR(priv->membase); + + bus->name = "ipq4019_mdio"; + bus->read = ipq4019_mdio_read; + bus->write = ipq4019_mdio_write; + bus->parent = &pdev->dev; + snprintf(bus->id, MII_BUS_ID_SIZE, "%s%d", pdev->name, pdev->id); + + ret = of_mdiobus_register(bus, pdev->dev.of_node); + if (ret) { + dev_err(&pdev->dev, "Cannot register MDIO bus!\n"); + return ret; + } + + platform_set_drvdata(pdev, bus); + + return 0; +} + +static int ipq4019_mdio_remove(struct platform_device *pdev) +{ + struct mii_bus *bus = platform_get_drvdata(pdev); + + mdiobus_unregister(bus); + + return 0; +} + +static const struct of_device_id ipq4019_mdio_dt_ids[] = { + { .compatible = "qcom,ipq4019-mdio" }, + { } +}; +MODULE_DEVICE_TABLE(of, ipq4019_mdio_dt_ids); + +static struct platform_driver ipq4019_mdio_driver = { + .probe = ipq4019_mdio_probe, + .remove = ipq4019_mdio_remove, + .driver = { + .name = "ipq4019-mdio", + .of_match_table = ipq4019_mdio_dt_ids, + }, +}; + +module_platform_driver(ipq4019_mdio_driver); + +MODULE_DESCRIPTION("ipq4019 MDIO interface driver"); +MODULE_AUTHOR("Qualcomm Atheros"); +MODULE_LICENSE("Dual BSD/GPL");