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// SPDX-License-Identifier: GPL-2.0
/* MOXA ART Ethernet (RTL8201CP) MDIO interface driver
*
* Copyright (C) 2013 Jonas Jensen <jonas.jensen@gmail.com>
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#define REG_PHY_CTRL 0
#define REG_PHY_WRITE_DATA 4
/* REG_PHY_CTRL */
#define MIIWR BIT(27) /* init write sequence (auto cleared)*/
#define MIIRD BIT(26)
#define REGAD_MASK 0x3e00000
#define PHYAD_MASK 0x1f0000
#define MIIRDATA_MASK 0xffff
/* REG_PHY_WRITE_DATA */
#define MIIWDATA_MASK 0xffff
struct moxart_mdio_data {
void __iomem *base;
};
static int moxart_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct moxart_mdio_data *data = bus->priv;
u32 ctrl = 0;
unsigned int count = 5;
dev_dbg(&bus->dev, "%s\n", __func__);
ctrl |= MIIRD | ((mii_id << 16) & PHYAD_MASK) |
((regnum << 21) & REGAD_MASK);
writel(ctrl, data->base + REG_PHY_CTRL);
do {
ctrl = readl(data->base + REG_PHY_CTRL);
if (!(ctrl & MIIRD))
return ctrl & MIIRDATA_MASK;
mdelay(10);
count--;
} while (count > 0);
dev_dbg(&bus->dev, "%s timed out\n", __func__);
return -ETIMEDOUT;
}
static int moxart_mdio_write(struct mii_bus *bus, int mii_id,
int regnum, u16 value)
{
struct moxart_mdio_data *data = bus->priv;
u32 ctrl = 0;
unsigned int count = 5;
dev_dbg(&bus->dev, "%s\n", __func__);
ctrl |= MIIWR | ((mii_id << 16) & PHYAD_MASK) |
((regnum << 21) & REGAD_MASK);
value &= MIIWDATA_MASK;
writel(value, data->base + REG_PHY_WRITE_DATA);
writel(ctrl, data->base + REG_PHY_CTRL);
do {
ctrl = readl(data->base + REG_PHY_CTRL);
if (!(ctrl & MIIWR))
return 0;
mdelay(10);
count--;
} while (count > 0);
dev_dbg(&bus->dev, "%s timed out\n", __func__);
return -ETIMEDOUT;
}
static int moxart_mdio_reset(struct mii_bus *bus)
{
int data, i;
for (i = 0; i < PHY_MAX_ADDR; i++) {
data = moxart_mdio_read(bus, i, MII_BMCR);
if (data < 0)
continue;
data |= BMCR_RESET;
if (moxart_mdio_write(bus, i, MII_BMCR, data) < 0)
continue;
}
return 0;
}
static int moxart_mdio_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
struct mii_bus *bus;
struct moxart_mdio_data *data;
int ret, i;
bus = mdiobus_alloc_size(sizeof(*data));
if (!bus)
return -ENOMEM;
bus->name = "MOXA ART Ethernet MII";
bus->read = &moxart_mdio_read;
bus->write = &moxart_mdio_write;
bus->reset = &moxart_mdio_reset;
snprintf(bus->id, MII_BUS_ID_SIZE, "%s-%d-mii", pdev->name, pdev->id);
bus->parent = &pdev->dev;
/* Setting PHY_IGNORE_INTERRUPT here even if it has no effect,
* of_mdiobus_register() sets these PHY_POLL.
* Ideally, the interrupt from MAC controller could be used to
* detect link state changes, not polling, i.e. if there was
* a way phy_driver could set PHY_HAS_INTERRUPT but have that
* interrupt handled in ethernet drivercode.
*/
for (i = 0; i < PHY_MAX_ADDR; i++)
bus->irq[i] = PHY_IGNORE_INTERRUPT;
data = bus->priv;
data->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->base)) {
ret = PTR_ERR(data->base);
goto err_out_free_mdiobus;
}
ret = of_mdiobus_register(bus, np);
if (ret < 0)
goto err_out_free_mdiobus;
platform_set_drvdata(pdev, bus);
return 0;
err_out_free_mdiobus:
mdiobus_free(bus);
return ret;
}
static int moxart_mdio_remove(struct platform_device *pdev)
{
struct mii_bus *bus = platform_get_drvdata(pdev);
mdiobus_unregister(bus);
mdiobus_free(bus);
return 0;
}
static const struct of_device_id moxart_mdio_dt_ids[] = {
{ .compatible = "moxa,moxart-mdio" },
{ }
};
MODULE_DEVICE_TABLE(of, moxart_mdio_dt_ids);
static struct platform_driver moxart_mdio_driver = {
.probe = moxart_mdio_probe,
.remove = moxart_mdio_remove,
.driver = {
.name = "moxart-mdio",
.of_match_table = moxart_mdio_dt_ids,
},
};
module_platform_driver(moxart_mdio_driver);
MODULE_DESCRIPTION("MOXA ART MDIO interface driver");
MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
MODULE_LICENSE("GPL v2");
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