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[88.207.96.108]) by smtp.googlemail.com with ESMTPSA id s6sm22729988wmh.17.2020.04.15.08.05.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 15 Apr 2020 08:05:20 -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 v3 1/3] net: phy: mdio: add IPQ40xx MDIO driver Date: Wed, 15 Apr 2020 17:02:43 +0200 Message-Id: <20200415150244.2737206-1-robert.marko@sartura.hr> X-Mailer: git-send-email 2.26.0 MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@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 Cc: Luka Perkov Reviewed-by: Andrew Lunn Reviewed-by: Florian Fainelli --- 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-ipq40xx.c | 160 +++++++++++++++++++++++++++++++++ 3 files changed, 168 insertions(+) create mode 100644 drivers/net/phy/mdio-ipq40xx.c diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 3fa33d27eeba..23bb5db033e3 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -157,6 +157,13 @@ config MDIO_I2C This is library mode. +config MDIO_IPQ40XX + tristate "Qualcomm IPQ40xx MDIO interface" + 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..36aafc6128c4 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-$(CONFIG_MDIO_IPQ40XX) += mdio-ipq40xx.o obj-$(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-ipq40xx.c b/drivers/net/phy/mdio-ipq40xx.c new file mode 100644 index 000000000000..acf1230341bd --- /dev/null +++ b/drivers/net/phy/mdio-ipq40xx.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 IPQ40XX_MDIO_TIMEOUT 10000 +#define IPQ40XX_MDIO_SLEEP 10 + +struct ipq40xx_mdio_data { + void __iomem *membase; +}; + +static int ipq40xx_mdio_wait_busy(struct mii_bus *bus) +{ + struct ipq40xx_mdio_data *priv = bus->priv; + unsigned int busy; + + return readl_poll_timeout(priv->membase + MDIO_CMD_REG, busy, + (busy & MDIO_CMD_ACCESS_BUSY) == 0, + IPQ40XX_MDIO_SLEEP, IPQ40XX_MDIO_TIMEOUT); +} + +static int ipq40xx_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct ipq40xx_mdio_data *priv = bus->priv; + unsigned int cmd; + + /* Reject clause 45 */ + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + if (ipq40xx_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 (ipq40xx_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + /* Read and return data */ + return readl(priv->membase + MDIO_DATA_READ_REG); +} + +static int ipq40xx_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct ipq40xx_mdio_data *priv = bus->priv; + unsigned int cmd; + + /* Reject clause 45 */ + if (regnum & MII_ADDR_C45) + return -EOPNOTSUPP; + + if (ipq40xx_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 (ipq40xx_mdio_wait_busy(bus)) + return -ETIMEDOUT; + + return 0; +} + +static int ipq40xx_mdio_probe(struct platform_device *pdev) +{ + struct ipq40xx_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 = "ipq40xx_mdio"; + bus->read = ipq40xx_mdio_read; + bus->write = ipq40xx_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 ipq40xx_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 ipq40xx_mdio_dt_ids[] = { + { .compatible = "qcom,ipq40xx-mdio" }, + { } +}; +MODULE_DEVICE_TABLE(of, ipq40xx_mdio_dt_ids); + +static struct platform_driver ipq40xx_mdio_driver = { + .probe = ipq40xx_mdio_probe, + .remove = ipq40xx_mdio_remove, + .driver = { + .name = "ipq40xx-mdio", + .of_match_table = ipq40xx_mdio_dt_ids, + }, +}; + +module_platform_driver(ipq40xx_mdio_driver); + +MODULE_DESCRIPTION("IPQ40XX MDIO interface driver"); +MODULE_AUTHOR("Qualcomm Atheros"); +MODULE_LICENSE("Dual BSD/GPL");