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/*
* Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
*
* Partially based on a patch from
* Copyright (c) 2014 Stefan Roese <sr@denx.de>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2, as published by the Free Software Foundation.
*
* 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.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/of.h>
#include "lan9303.h"
/* Generate phy-addr and -reg from the input address */
#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
#define PHY_REG(x) (((x) >> 1) & 0x1f)
struct lan9303_mdio {
struct mdio_device *device;
struct lan9303 chip;
};
static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
{
mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
}
static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
{
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
mutex_lock(&sw_dev->device->bus->mdio_lock);
lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
mutex_unlock(&sw_dev->device->bus->mdio_lock);
return 0;
}
static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
{
return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
}
static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
{
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
mutex_lock(&sw_dev->device->bus->mdio_lock);
*val = lan9303_mdio_real_read(sw_dev->device, reg);
*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
mutex_unlock(&sw_dev->device->bus->mdio_lock);
return 0;
}
static const struct regmap_config lan9303_mdio_regmap_config = {
.reg_bits = 8,
.val_bits = 32,
.reg_stride = 1,
.can_multi_write = true,
.max_register = 0x0ff, /* address bits 0..1 are not used */
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
.volatile_table = &lan9303_register_set,
.wr_table = &lan9303_register_set,
.rd_table = &lan9303_register_set,
.reg_read = lan9303_mdio_read,
.reg_write = lan9303_mdio_write,
.cache_type = REGCACHE_NONE,
};
static int lan9303_mdio_probe(struct mdio_device *mdiodev)
{
struct lan9303_mdio *sw_dev;
int ret;
sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
GFP_KERNEL);
if (!sw_dev)
return -ENOMEM;
sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
&lan9303_mdio_regmap_config);
if (IS_ERR(sw_dev->chip.regmap)) {
ret = PTR_ERR(sw_dev->chip.regmap);
dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
return ret;
}
/* link forward and backward */
sw_dev->device = mdiodev;
dev_set_drvdata(&mdiodev->dev, sw_dev);
sw_dev->chip.dev = &mdiodev->dev;
ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
if (ret != 0)
return ret;
dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
return 0;
}
static void lan9303_mdio_remove(struct mdio_device *mdiodev)
{
struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
if (!sw_dev)
return;
lan9303_remove(&sw_dev->chip);
}
/*-------------------------------------------------------------------------*/
static const struct of_device_id lan9303_mdio_of_match[] = {
{ .compatible = "smsc,lan9303-mdio" },
{ /* sentinel */ },
};
MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
static struct mdio_driver lan9303_mdio_driver = {
.mdiodrv.driver = {
.name = "LAN9303_MDIO",
.of_match_table = of_match_ptr(lan9303_mdio_of_match),
},
.probe = lan9303_mdio_probe,
.remove = lan9303_mdio_remove,
};
mdio_module_driver(lan9303_mdio_driver);
MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
MODULE_LICENSE("GPL v2");
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