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    Subject[PATCH v2 1/2] net: mdio: add ipq8064 mdio driver
    Date
    Currently ipq806x soc use generi bitbang driver to
    comunicate with the gmac ethernet interface.
    Add a dedicated driver created by chunkeey to fix this.

    Christian Lamparter <chunkeey@gmail.com>
    Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
    ---
    drivers/net/phy/Kconfig | 8 ++
    drivers/net/phy/Makefile | 1 +
    drivers/net/phy/mdio-ipq8064.c | 163 +++++++++++++++++++++++++++++++++
    3 files changed, 172 insertions(+)
    create mode 100644 drivers/net/phy/mdio-ipq8064.c

    diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
    index 9dabe03a668c..ec2a5493a7e8 100644
    --- a/drivers/net/phy/Kconfig
    +++ b/drivers/net/phy/Kconfig
    @@ -157,6 +157,14 @@ config MDIO_I2C

    This is library mode.

    +config MDIO_IPQ8064
    + tristate "Qualcomm IPQ8064 MDIO interface support"
    + depends on HAS_IOMEM && OF_MDIO
    + depends on MFD_SYSCON
    + help
    + This driver supports the MDIO interface found in the network
    + interface units of the IPQ8064 SoC
    +
    config MDIO_MOXART
    tristate "MOXA ART MDIO interface support"
    depends on ARCH_MOXART || COMPILE_TEST
    diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
    index fe5badf13b65..8f02bd2089f3 100644
    --- a/drivers/net/phy/Makefile
    +++ b/drivers/net/phy/Makefile
    @@ -36,6 +36,7 @@ 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-$(CONFIG_MDIO_IPQ8064) += mdio-ipq8064.o
    obj-$(CONFIG_MDIO_MOXART) += mdio-moxart.o
    obj-$(CONFIG_MDIO_MSCC_MIIM) += mdio-mscc-miim.o
    obj-$(CONFIG_MDIO_OCTEON) += mdio-octeon.o
    diff --git a/drivers/net/phy/mdio-ipq8064.c b/drivers/net/phy/mdio-ipq8064.c
    new file mode 100644
    index 000000000000..e974a6f5d5ef
    --- /dev/null
    +++ b/drivers/net/phy/mdio-ipq8064.c
    @@ -0,0 +1,163 @@
    +// SPDX-License-Identifier: GPL-2.0
    +//
    +// Qualcomm IPQ8064 MDIO interface driver
    +//
    +// Copyright (C) 2019 Christian Lamparter <chunkeey@gmail.com>
    +
    +#include <linux/delay.h>
    +#include <linux/kernel.h>
    +#include <linux/module.h>
    +#include <linux/regmap.h>
    +#include <linux/of_mdio.h>
    +#include <linux/phy.h>
    +#include <linux/platform_device.h>
    +#include <linux/mfd/syscon.h>
    +
    +/* MII address register definitions */
    +#define MII_ADDR_REG_ADDR 0x10
    +#define MII_BUSY BIT(0)
    +#define MII_WRITE BIT(1)
    +#define MII_CLKRANGE_60_100M (0 << 2)
    +#define MII_CLKRANGE_100_150M (1 << 2)
    +#define MII_CLKRANGE_20_35M (2 << 2)
    +#define MII_CLKRANGE_35_60M (3 << 2)
    +#define MII_CLKRANGE_150_250M (4 << 2)
    +#define MII_CLKRANGE_250_300M (5 << 2)
    +#define MII_CLKRANGE_MASK GENMASK(4, 2)
    +#define MII_REG_SHIFT 6
    +#define MII_REG_MASK GENMASK(10, 6)
    +#define MII_ADDR_SHIFT 11
    +#define MII_ADDR_MASK GENMASK(15, 11)
    +
    +#define MII_DATA_REG_ADDR 0x14
    +
    +#define MII_MDIO_DELAY (1000)
    +#define MII_MDIO_RETRY (10)
    +
    +struct ipq8064_mdio {
    + struct regmap *base; /* NSS_GMAC0_BASE */
    +};
    +
    +static int
    +ipq8064_mdio_wait_busy(struct ipq8064_mdio *priv)
    +{
    + u32 busy;
    +
    + return regmap_read_poll_timeout(priv->base, MII_ADDR_REG_ADDR, busy,
    + !(busy & MII_BUSY), MII_MDIO_DELAY,
    + MII_MDIO_RETRY * USEC_PER_MSEC);
    +}
    +
    +static int
    +ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset)
    +{
    + struct ipq8064_mdio *priv = bus->priv;
    + u32 miiaddr = MII_BUSY | MII_CLKRANGE_250_300M;
    + u32 ret_val;
    + int err;
    +
    + /* Reject clause 45 */
    + if (reg_offset & MII_ADDR_C45)
    + return -EOPNOTSUPP;
    +
    + miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |
    + ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
    +
    + regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
    + usleep_range(10, 20);
    +
    + err = ipq8064_mdio_wait_busy(priv);
    + if (err)
    + return err;
    +
    + regmap_read(priv->base, MII_DATA_REG_ADDR, &ret_val);
    + return (int)ret_val;
    +}
    +
    +static int
    +ipq8064_mdio_write(struct mii_bus *bus, int phy_addr, int reg_offset, u16 data)
    +{
    + struct ipq8064_mdio *priv = bus->priv;
    + u32 miiaddr = MII_WRITE | MII_BUSY | MII_CLKRANGE_250_300M;
    +
    + /* Reject clause 45 */
    + if (reg_offset & MII_ADDR_C45)
    + return -EOPNOTSUPP;
    +
    + regmap_write(priv->base, MII_DATA_REG_ADDR, data);
    +
    + miiaddr |= ((phy_addr << MII_ADDR_SHIFT) & MII_ADDR_MASK) |
    + ((reg_offset << MII_REG_SHIFT) & MII_REG_MASK);
    +
    + regmap_write(priv->base, MII_ADDR_REG_ADDR, miiaddr);
    + usleep_range(10, 20);
    +
    + return ipq8064_mdio_wait_busy(priv);
    +}
    +
    +static int
    +ipq8064_mdio_probe(struct platform_device *pdev)
    +{
    + struct device_node *np = pdev->dev.of_node;
    + struct ipq8064_mdio *priv;
    + struct mii_bus *bus;
    + int ret;
    +
    + bus = devm_mdiobus_alloc_size(&pdev->dev, sizeof(*priv));
    + if (!bus)
    + return -ENOMEM;
    +
    + bus->name = "ipq8064_mdio_bus";
    + bus->read = ipq8064_mdio_read;
    + bus->write = ipq8064_mdio_write;
    + snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
    + bus->parent = &pdev->dev;
    +
    + priv = bus->priv;
    + priv->base = syscon_node_to_regmap(np);
    + if (IS_ERR_OR_NULL(priv->base)) {
    + priv->base = syscon_regmap_lookup_by_phandle(np, "master");
    + if (IS_ERR_OR_NULL(priv->base)) {
    + dev_err(&pdev->dev, "master phandle not found\n");
    + return -EINVAL;
    + }
    + }
    +
    + ret = of_mdiobus_register(bus, np);
    + if (ret)
    + return ret;
    +
    + platform_set_drvdata(pdev, bus);
    + return 0;
    +}
    +
    +static int
    +ipq8064_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 ipq8064_mdio_dt_ids[] = {
    + { .compatible = "qcom,ipq8064-mdio" },
    + { }
    +};
    +MODULE_DEVICE_TABLE(of, ipq8064_mdio_dt_ids);
    +
    +static struct platform_driver ipq8064_mdio_driver = {
    + .probe = ipq8064_mdio_probe,
    + .remove = ipq8064_mdio_remove,
    + .driver = {
    + .name = "ipq8064-mdio",
    + .of_match_table = ipq8064_mdio_dt_ids,
    + },
    +};
    +
    +module_platform_driver(ipq8064_mdio_driver);
    +
    +MODULE_DESCRIPTION("Qualcomm IPQ8064 MDIO interface driver");
    +MODULE_AUTHOR("Christian Lamparter <chunkeey@gmail.com>");
    +MODULE_LICENSE("GPL");
    --
    2.25.0
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      Last update: 2020-02-20 18:09    [W:3.564 / U:0.496 seconds]
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