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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2025 Liebherr-Electronics and Drives GmbH
*/
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/phy/phy.h>
#include <linux/spi/spi.h>
#define TJA1145_MODE_CTRL 0x01
#define TJA1145_MODE_CTRL_MC GENMASK(2, 0)
#define TJA1145_MODE_CTRL_STBY BIT(2)
#define TJA1145_MODE_CTRL_NORMAL TJA1145_MODE_CTRL_MC
#define TJA1145_CAN_CTRL 0x20
#define TJA1145_CAN_CTRL_CMC GENMASK(1, 0)
#define TJA1145_CAN_CTRL_ACTIVE BIT(1)
#define TJA1145_IDENT 0x7e
#define TJA1145_IDENT_TJA1145T 0x70
#define TJA1145_SPI_READ_BIT BIT(0)
#define TJA1145T_MAX_BITRATE 1000000
static int tja1145_phy_power_on(struct phy *phy)
{
struct regmap *map = phy_get_drvdata(phy);
int ret;
/*
* Switch operating mode to normal which is the active operating mode.
* In this mode, the device is fully operational.
*/
ret = regmap_update_bits(map, TJA1145_MODE_CTRL, TJA1145_MODE_CTRL_MC,
TJA1145_MODE_CTRL_NORMAL);
if (ret)
return ret;
/*
* Switch to CAN operating mode active where the PHY can transmit and
* receive data.
*/
return regmap_update_bits(map, TJA1145_CAN_CTRL, TJA1145_CAN_CTRL_CMC,
TJA1145_CAN_CTRL_ACTIVE);
}
static int tja1145_phy_power_off(struct phy *phy)
{
struct regmap *map = phy_get_drvdata(phy);
/*
* Switch to operating mode standby, the PHY is unable to transmit or
* receive data in standby mode.
*/
return regmap_update_bits(map, TJA1145_MODE_CTRL, TJA1145_MODE_CTRL_MC,
TJA1145_MODE_CTRL_STBY);
}
static const struct phy_ops tja1145_phy_ops = {
.power_on = tja1145_phy_power_on,
.power_off = tja1145_phy_power_off,
.owner = THIS_MODULE,
};
static const struct regmap_range tja1145_wr_holes_ranges[] = {
regmap_reg_range(0x00, 0x00),
regmap_reg_range(0x02, 0x03),
regmap_reg_range(0x05, 0x05),
regmap_reg_range(0x0b, 0x1f),
regmap_reg_range(0x21, 0x22),
regmap_reg_range(0x24, 0x25),
regmap_reg_range(0x30, 0x4b),
regmap_reg_range(0x4d, 0x60),
regmap_reg_range(0x62, 0x62),
regmap_reg_range(0x65, 0x67),
regmap_reg_range(0x70, 0xff),
};
static const struct regmap_access_table tja1145_wr_table = {
.no_ranges = tja1145_wr_holes_ranges,
.n_no_ranges = ARRAY_SIZE(tja1145_wr_holes_ranges),
};
static const struct regmap_range tja1145_rd_holes_ranges[] = {
regmap_reg_range(0x00, 0x00),
regmap_reg_range(0x02, 0x02),
regmap_reg_range(0x05, 0x05),
regmap_reg_range(0x0b, 0x1f),
regmap_reg_range(0x21, 0x21),
regmap_reg_range(0x24, 0x25),
regmap_reg_range(0x30, 0x4a),
regmap_reg_range(0x4d, 0x5f),
regmap_reg_range(0x62, 0x62),
regmap_reg_range(0x65, 0x67),
regmap_reg_range(0x70, 0x7d),
regmap_reg_range(0x7f, 0xff),
};
static const struct regmap_access_table tja1145_rd_table = {
.no_ranges = tja1145_rd_holes_ranges,
.n_no_ranges = ARRAY_SIZE(tja1145_rd_holes_ranges),
};
static const struct regmap_config tja1145_regmap_config = {
.reg_bits = 8,
.reg_shift = -1,
.val_bits = 8,
.wr_table = &tja1145_wr_table,
.rd_table = &tja1145_rd_table,
.read_flag_mask = TJA1145_SPI_READ_BIT,
.max_register = TJA1145_IDENT,
};
static int tja1145_check_ident(struct device *dev, struct regmap *map)
{
unsigned int val;
int ret;
ret = regmap_read(map, TJA1145_IDENT, &val);
if (ret)
return ret;
if (val != TJA1145_IDENT_TJA1145T) {
dev_err(dev, "Expected device id: 0x%02x, got: 0x%02x\n",
TJA1145_IDENT_TJA1145T, val);
return -ENODEV;
}
return 0;
}
static int tja1145_probe(struct spi_device *spi)
{
struct phy_provider *phy_provider;
struct device *dev = &spi->dev;
struct regmap *map;
struct phy *phy;
int ret;
map = devm_regmap_init_spi(spi, &tja1145_regmap_config);
if (IS_ERR(map))
return dev_err_probe(dev, PTR_ERR(map), "failed to init regmap\n");
ret = tja1145_check_ident(dev, map);
if (ret)
return dev_err_probe(dev, ret, "failed to identify device\n");
phy = devm_phy_create(dev, dev->of_node, &tja1145_phy_ops);
if (IS_ERR(phy))
return dev_err_probe(dev, PTR_ERR(phy), "failed to create PHY\n");
phy->attrs.max_link_rate = TJA1145T_MAX_BITRATE;
phy_set_drvdata(phy, map);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct spi_device_id tja1145_spi_id[] = {
{ "tja1145" },
{ }
};
MODULE_DEVICE_TABLE(spi, tja1145_spi_id);
static const struct of_device_id tja1145_of_match[] = {
{ .compatible = "nxp,tja1145" },
{ }
};
MODULE_DEVICE_TABLE(of, tja1145_of_match);
static struct spi_driver tja1145_driver = {
.driver = {
.name = "tja1145",
.of_match_table = tja1145_of_match,
},
.probe = tja1145_probe,
.id_table = tja1145_spi_id,
};
module_spi_driver(tja1145_driver);
MODULE_DESCRIPTION("NXP TJA1145 CAN transceiver PHY driver");
MODULE_AUTHOR("Dimitri Fedrau <dimitri.fedrau@liebherr.com>");
MODULE_LICENSE("GPL");
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