diff options
Diffstat (limited to 'drivers/net/phy/mdio-hisi-femac.c')
| -rw-r--r-- | drivers/net/phy/mdio-hisi-femac.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-hisi-femac.c b/drivers/net/phy/mdio-hisi-femac.c new file mode 100644 index 000000000000..b03fedd6c1d8 --- /dev/null +++ b/drivers/net/phy/mdio-hisi-femac.c @@ -0,0 +1,166 @@ +/* + * Hisilicon Fast Ethernet MDIO Bus Driver + * + * Copyright (c) 2016 HiSilicon Technologies Co., Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/clk.h> +#include <linux/iopoll.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/of_address.h> +#include <linux/of_mdio.h> +#include <linux/platform_device.h> + +#define MDIO_RWCTRL 0x00 +#define MDIO_RO_DATA 0x04 +#define MDIO_WRITE BIT(13) +#define MDIO_RW_FINISH BIT(15) +#define BIT_PHY_ADDR_OFFSET 8 +#define BIT_WR_DATA_OFFSET 16 + +struct hisi_femac_mdio_data { + struct clk *clk; + void __iomem *membase; +}; + +static int hisi_femac_mdio_wait_ready(struct hisi_femac_mdio_data *data) +{ + u32 val; + + return readl_poll_timeout(data->membase + MDIO_RWCTRL, + val, val & MDIO_RW_FINISH, 20, 10000); +} + +static int hisi_femac_mdio_read(struct mii_bus *bus, int mii_id, int regnum) +{ + struct hisi_femac_mdio_data *data = bus->priv; + int ret; + + ret = hisi_femac_mdio_wait_ready(data); + if (ret) + return ret; + + writel((mii_id << BIT_PHY_ADDR_OFFSET) | regnum, + data->membase + MDIO_RWCTRL); + + ret = hisi_femac_mdio_wait_ready(data); + if (ret) + return ret; + + return readl(data->membase + MDIO_RO_DATA) & 0xFFFF; +} + +static int hisi_femac_mdio_write(struct mii_bus *bus, int mii_id, int regnum, + u16 value) +{ + struct hisi_femac_mdio_data *data = bus->priv; + int ret; + + ret = hisi_femac_mdio_wait_ready(data); + if (ret) + return ret; + + writel(MDIO_WRITE | (value << BIT_WR_DATA_OFFSET) | + (mii_id << BIT_PHY_ADDR_OFFSET) | regnum, + data->membase + MDIO_RWCTRL); + + return hisi_femac_mdio_wait_ready(data); +} + +static int hisi_femac_mdio_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct mii_bus *bus; + struct hisi_femac_mdio_data *data; + struct resource *res; + int ret; + + bus = mdiobus_alloc_size(sizeof(*data)); + if (!bus) + return -ENOMEM; + + bus->name = "hisi_femac_mii_bus"; + bus->read = &hisi_femac_mdio_read; + bus->write = &hisi_femac_mdio_write; + snprintf(bus->id, MII_BUS_ID_SIZE, "%s", pdev->name); + bus->parent = &pdev->dev; + + data = bus->priv; + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + data->membase = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(data->membase)) { + ret = PTR_ERR(data->membase); + goto err_out_free_mdiobus; + } + + data->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(data->clk)) { + ret = PTR_ERR(data->clk); + goto err_out_free_mdiobus; + } + + ret = clk_prepare_enable(data->clk); + if (ret) + goto err_out_free_mdiobus; + + ret = of_mdiobus_register(bus, np); + if (ret) + goto err_out_disable_clk; + + platform_set_drvdata(pdev, bus); + + return 0; + +err_out_disable_clk: + clk_disable_unprepare(data->clk); +err_out_free_mdiobus: + mdiobus_free(bus); + return ret; +} + +static int hisi_femac_mdio_remove(struct platform_device *pdev) +{ + struct mii_bus *bus = platform_get_drvdata(pdev); + struct hisi_femac_mdio_data *data = bus->priv; + + mdiobus_unregister(bus); + clk_disable_unprepare(data->clk); + mdiobus_free(bus); + + return 0; +} + +static const struct of_device_id hisi_femac_mdio_dt_ids[] = { + { .compatible = "hisilicon,hisi-femac-mdio" }, + { } +}; +MODULE_DEVICE_TABLE(of, hisi_femac_mdio_dt_ids); + +static struct platform_driver hisi_femac_mdio_driver = { + .probe = hisi_femac_mdio_probe, + .remove = hisi_femac_mdio_remove, + .driver = { + .name = "hisi-femac-mdio", + .of_match_table = hisi_femac_mdio_dt_ids, + }, +}; + +module_platform_driver(hisi_femac_mdio_driver); + +MODULE_DESCRIPTION("Hisilicon Fast Ethernet MAC MDIO interface driver"); +MODULE_AUTHOR("Dongpo Li <lidongpo@hisilicon.com>"); +MODULE_LICENSE("GPL v2"); |