155 строки
3.5 KiB
C
155 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Hisilicon Fast Ethernet MDIO Bus Driver
|
|
*
|
|
* Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
|
|
*/
|
|
|
|
#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");
|