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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020 NovaTech LLC
* George McCollister <george.mccollister@gmail.com>
*/
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/if_vlan.h>
#include <linux/of.h>
#include "xrs700x.h"
#include "xrs700x_reg.h"
#define XRS_MDIO_IBA0 0x10
#define XRS_MDIO_IBA1 0x11
#define XRS_MDIO_IBD 0x14
#define XRS_IB_READ 0x0
#define XRS_IB_WRITE 0x1
static int xrs700x_mdio_reg_read(void *context, unsigned int reg,
unsigned int *val)
{
struct mdio_device *mdiodev = context;
struct device *dev = &mdiodev->dev;
u16 uval;
int ret;
uval = (u16)FIELD_GET(GENMASK(31, 16), reg);
ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA1, uval);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_write returned %d\n", ret);
return ret;
}
uval = (u16)((reg & GENMASK(15, 1)) | XRS_IB_READ);
ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA0, uval);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_write returned %d\n", ret);
return ret;
}
ret = mdiobus_read(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBD);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_read returned %d\n", ret);
return ret;
}
*val = (unsigned int)ret;
return 0;
}
static int xrs700x_mdio_reg_write(void *context, unsigned int reg,
unsigned int val)
{
struct mdio_device *mdiodev = context;
struct device *dev = &mdiodev->dev;
u16 uval;
int ret;
ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBD, (u16)val);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_write returned %d\n", ret);
return ret;
}
uval = (u16)FIELD_GET(GENMASK(31, 16), reg);
ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA1, uval);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_write returned %d\n", ret);
return ret;
}
uval = (u16)((reg & GENMASK(15, 1)) | XRS_IB_WRITE);
ret = mdiobus_write(mdiodev->bus, mdiodev->addr, XRS_MDIO_IBA0, uval);
if (ret < 0) {
dev_err(dev, "xrs mdiobus_write returned %d\n", ret);
return ret;
}
return 0;
}
static const struct regmap_config xrs700x_mdio_regmap_config = {
.val_bits = 16,
.reg_stride = 2,
.reg_bits = 32,
.pad_bits = 0,
.write_flag_mask = 0,
.read_flag_mask = 0,
.reg_read = xrs700x_mdio_reg_read,
.reg_write = xrs700x_mdio_reg_write,
.max_register = XRS_VLAN(VLAN_N_VID - 1),
.cache_type = REGCACHE_NONE,
.reg_format_endian = REGMAP_ENDIAN_BIG,
.val_format_endian = REGMAP_ENDIAN_BIG
};
static int xrs700x_mdio_probe(struct mdio_device *mdiodev)
{
struct xrs700x *priv;
int ret;
priv = xrs700x_switch_alloc(&mdiodev->dev, mdiodev);
if (!priv)
return -ENOMEM;
priv->regmap = devm_regmap_init(&mdiodev->dev, NULL, mdiodev,
&xrs700x_mdio_regmap_config);
if (IS_ERR(priv->regmap)) {
ret = PTR_ERR(priv->regmap);
dev_err(&mdiodev->dev, "Failed to initialize regmap: %d\n", ret);
return ret;
}
dev_set_drvdata(&mdiodev->dev, priv);
ret = xrs700x_switch_register(priv);
/* Main DSA driver may not be started yet. */
if (ret)
return ret;
return 0;
}
static void xrs700x_mdio_remove(struct mdio_device *mdiodev)
{
struct xrs700x *priv = dev_get_drvdata(&mdiodev->dev);
xrs700x_switch_remove(priv);
}
static const struct of_device_id __maybe_unused xrs700x_mdio_dt_ids[] = {
{ .compatible = "arrow,xrs7003e", .data = &xrs7003e_info },
{ .compatible = "arrow,xrs7003f", .data = &xrs7003f_info },
{ .compatible = "arrow,xrs7004e", .data = &xrs7004e_info },
{ .compatible = "arrow,xrs7004f", .data = &xrs7004f_info },
{},
};
MODULE_DEVICE_TABLE(of, xrs700x_mdio_dt_ids);
static struct mdio_driver xrs700x_mdio_driver = {
.mdiodrv.driver = {
.name = "xrs700x-mdio",
.of_match_table = of_match_ptr(xrs700x_mdio_dt_ids),
},
.probe = xrs700x_mdio_probe,
.remove = xrs700x_mdio_remove,
};
mdio_module_driver(xrs700x_mdio_driver);
MODULE_AUTHOR("George McCollister <george.mccollister@gmail.com>");
MODULE_DESCRIPTION("Arrow SpeedChips XRS700x DSA MDIO driver");
MODULE_LICENSE("GPL v2");
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