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// SPDX-License-Identifier: GPL-2.0+
/*
* Hisilicon Fast Ethernet MDIO Bus Driver
*
* Copyright (c) 2016 HiSilicon Technologies Co., Ltd.
*/
#include <dm.h>
#include <clk.h>
#include <miiphy.h>
#include <linux/io.h>
#include <linux/iopoll.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, 10000);
}
static int hisi_femac_mdio_read(struct udevice *dev, int addr, int devad, int reg)
{
struct hisi_femac_mdio_data *data = dev_get_priv(dev);
int ret;
ret = hisi_femac_mdio_wait_ready(data);
if (ret)
return ret;
writel((addr << BIT_PHY_ADDR_OFFSET) | reg,
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 udevice *dev, int addr, int devad, int reg, u16 val)
{
struct hisi_femac_mdio_data *data = dev_get_priv(dev);
int ret;
ret = hisi_femac_mdio_wait_ready(data);
if (ret)
return ret;
writel(MDIO_WRITE | (val << BIT_WR_DATA_OFFSET) |
(addr << BIT_PHY_ADDR_OFFSET) | reg,
data->membase + MDIO_RWCTRL);
return hisi_femac_mdio_wait_ready(data);
}
static int hisi_femac_mdio_of_to_plat(struct udevice *dev)
{
struct hisi_femac_mdio_data *data = dev_get_priv(dev);
int ret;
data->membase = dev_remap_addr(dev);
if (IS_ERR(data->membase)) {
ret = PTR_ERR(data->membase);
return log_msg_ret("Failed to remap base addr", ret);
}
// clk is optional
data->clk = devm_clk_get_optional(dev, NULL);
return 0;
}
static int hisi_femac_mdio_probe(struct udevice *dev)
{
struct hisi_femac_mdio_data *data = dev_get_priv(dev);
int ret;
ret = clk_prepare_enable(data->clk);
if (ret)
return log_msg_ret("Failed to enable clk", ret);
return 0;
}
static const struct mdio_ops hisi_femac_mdio_ops = {
.read = hisi_femac_mdio_read,
.write = hisi_femac_mdio_write,
};
static const struct udevice_id hisi_femac_mdio_dt_ids[] = {
{ .compatible = "hisilicon,hisi-femac-mdio" },
{ }
};
U_BOOT_DRIVER(hisi_femac_mdio_driver) = {
.name = "hisi-femac-mdio",
.id = UCLASS_MDIO,
.of_match = hisi_femac_mdio_dt_ids,
.of_to_plat = hisi_femac_mdio_of_to_plat,
.probe = hisi_femac_mdio_probe,
.ops = &hisi_femac_mdio_ops,
.priv_auto = sizeof(struct hisi_femac_mdio_data),
};
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