diff options
Diffstat (limited to 'drivers/net/mdio/mdio-ipq8064.c')
| -rw-r--r-- | drivers/net/mdio/mdio-ipq8064.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/net/mdio/mdio-ipq8064.c b/drivers/net/mdio/mdio-ipq8064.c new file mode 100644 index 000000000000..1bd18857e1c5 --- /dev/null +++ b/drivers/net/mdio/mdio-ipq8064.c @@ -0,0 +1,166 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Qualcomm IPQ8064 MDIO interface driver + * + * Copyright (C) 2019 Christian Lamparter <chunkeey@gmail.com> + * Copyright (C) 2020 Ansuel Smith <ansuelsmth@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_USEC (1000) +#define MII_MDIO_RETRY_MSEC (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_USEC, + MII_MDIO_RETRY_MSEC * USEC_PER_MSEC); +} + +static int +ipq8064_mdio_read(struct mii_bus *bus, int phy_addr, int reg_offset) +{ + u32 miiaddr = MII_BUSY | MII_CLKRANGE_250_300M; + struct ipq8064_mdio *priv = bus->priv; + 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(8, 10); + + 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) +{ + u32 miiaddr = MII_WRITE | MII_BUSY | MII_CLKRANGE_250_300M; + struct ipq8064_mdio *priv = bus->priv; + + /* 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(8, 10); + + 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 = device_node_to_regmap(np); + if (IS_ERR(priv->base)) { + if (priv->base == ERR_PTR(-EPROBE_DEFER)) + return -EPROBE_DEFER; + + dev_err(&pdev->dev, "error getting device regmap, error=%pe\n", + priv->base); + return PTR_ERR(priv->base); + } + + 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_AUTHOR("Ansuel Smith <ansuelsmth@gmail.com>"); +MODULE_LICENSE("GPL"); |