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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for Texas Instruments TPS53679
*
* Copyright (c) 2017 Mellanox Technologies. All rights reserved.
* Copyright (c) 2017 Vadim Pasternak <vadimp@mellanox.com>
*/
#include <linux/bits.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"
enum chips {
tps53647, tps53667, tps53679, tps53681, tps53688
};
#define TPS53647_PAGE_NUM 1
#define TPS53679_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */
#define TPS53679_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */
#define TPS53679_PROT_VR13_10MV 0x04 /* VR13.0 mode, 10-mV DAC */
#define TPS53679_PROT_IMVP8_5MV 0x05 /* IMVP8 mode, 5-mV DAC */
#define TPS53679_PROT_VR13_5MV 0x07 /* VR13.0 mode, 5-mV DAC */
#define TPS53679_PAGE_NUM 2
#define TPS53681_DEVICE_ID 0x81
#define TPS53681_PMBUS_REVISION 0x33
#define TPS53681_MFR_SPECIFIC_20 0xe4 /* Number of phases, per page */
static const struct i2c_device_id tps53679_id[];
static int tps53679_identify_mode(struct i2c_client *client,
struct pmbus_driver_info *info)
{
u8 vout_params;
int i, ret;
for (i = 0; i < info->pages; i++) {
/* Read the register with VOUT scaling value.*/
ret = pmbus_read_byte_data(client, i, PMBUS_VOUT_MODE);
if (ret < 0)
return ret;
vout_params = ret & GENMASK(4, 0);
switch (vout_params) {
case TPS53679_PROT_VR13_10MV:
case TPS53679_PROT_VR12_5_10MV:
info->vrm_version[i] = vr13;
break;
case TPS53679_PROT_VR13_5MV:
case TPS53679_PROT_VR12_5MV:
case TPS53679_PROT_IMVP8_5MV:
info->vrm_version[i] = vr12;
break;
default:
return -EINVAL;
}
}
return 0;
}
static int tps53679_identify_phases(struct i2c_client *client,
struct pmbus_driver_info *info)
{
int ret;
/* On TPS53681, only channel A provides per-phase output current */
ret = pmbus_read_byte_data(client, 0, TPS53681_MFR_SPECIFIC_20);
if (ret < 0)
return ret;
info->phases[0] = (ret & 0x07) + 1;
return 0;
}
static int tps53679_identify_chip(struct i2c_client *client,
u8 revision, u16 id)
{
u8 buf[I2C_SMBUS_BLOCK_MAX];
int ret;
ret = pmbus_read_byte_data(client, 0, PMBUS_REVISION);
if (ret < 0)
return ret;
if (ret != revision) {
dev_err(&client->dev, "Unexpected PMBus revision 0x%x\n", ret);
return -ENODEV;
}
ret = i2c_smbus_read_block_data(client, PMBUS_IC_DEVICE_ID, buf);
if (ret < 0)
return ret;
if (ret != 1 || buf[0] != id) {
dev_err(&client->dev, "Unexpected device ID 0x%x\n", buf[0]);
return -ENODEV;
}
return 0;
}
/*
* Common identification function for chips with multi-phase support.
* Since those chips have special configuration registers, we want to have
* some level of reassurance that we are really talking with the chip
* being probed. Check PMBus revision and chip ID.
*/
static int tps53679_identify_multiphase(struct i2c_client *client,
struct pmbus_driver_info *info,
int pmbus_rev, int device_id)
{
int ret;
ret = tps53679_identify_chip(client, pmbus_rev, device_id);
if (ret < 0)
return ret;
ret = tps53679_identify_mode(client, info);
if (ret < 0)
return ret;
return tps53679_identify_phases(client, info);
}
static int tps53679_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
return tps53679_identify_mode(client, info);
}
static int tps53681_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
return tps53679_identify_multiphase(client, info,
TPS53681_PMBUS_REVISION,
TPS53681_DEVICE_ID);
}
static int tps53681_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
/*
* For reading the total output current (READ_IOUT) for all phases,
* the chip datasheet is a bit vague. It says "PHASE must be set to
* FFh to access all phases simultaneously. PHASE may also be set to
* 80h readack (!) the total phase current".
* Experiments show that the command does _not_ report the total
* current for all phases if the phase is set to 0xff. Instead, it
* appears to report the current of one of the phases. Override phase
* parameter with 0x80 when reading the total output current on page 0.
*/
if (reg == PMBUS_READ_IOUT && page == 0 && phase == 0xff)
return pmbus_read_word_data(client, page, 0x80, reg);
return -ENODATA;
}
static struct pmbus_driver_info tps53679_info = {
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_POWER] = linear,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN | PMBUS_HAVE_PIN |
PMBUS_HAVE_STATUS_INPUT |
PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT,
.func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT,
.pfunc[0] = PMBUS_HAVE_IOUT,
.pfunc[1] = PMBUS_HAVE_IOUT,
.pfunc[2] = PMBUS_HAVE_IOUT,
.pfunc[3] = PMBUS_HAVE_IOUT,
.pfunc[4] = PMBUS_HAVE_IOUT,
.pfunc[5] = PMBUS_HAVE_IOUT,
};
static int tps53679_probe(struct i2c_client *client)
{
struct device *dev = &client->dev;
struct pmbus_driver_info *info;
enum chips chip_id;
if (dev->of_node)
chip_id = (enum chips)of_device_get_match_data(dev);
else
chip_id = i2c_match_id(tps53679_id, client)->driver_data;
info = devm_kmemdup(dev, &tps53679_info, sizeof(*info), GFP_KERNEL);
if (!info)
return -ENOMEM;
switch (chip_id) {
case tps53647:
case tps53667:
info->pages = TPS53647_PAGE_NUM;
info->identify = tps53679_identify;
break;
case tps53679:
case tps53688:
info->pages = TPS53679_PAGE_NUM;
info->identify = tps53679_identify;
break;
case tps53681:
info->pages = TPS53679_PAGE_NUM;
info->phases[0] = 6;
info->identify = tps53681_identify;
info->read_word_data = tps53681_read_word_data;
break;
default:
return -ENODEV;
}
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id tps53679_id[] = {
{"tps53647", tps53647},
{"tps53667", tps53667},
{"tps53679", tps53679},
{"tps53681", tps53681},
{"tps53688", tps53688},
{}
};
MODULE_DEVICE_TABLE(i2c, tps53679_id);
static const struct of_device_id __maybe_unused tps53679_of_match[] = {
{.compatible = "ti,tps53647", .data = (void *)tps53647},
{.compatible = "ti,tps53667", .data = (void *)tps53667},
{.compatible = "ti,tps53679", .data = (void *)tps53679},
{.compatible = "ti,tps53681", .data = (void *)tps53681},
{.compatible = "ti,tps53688", .data = (void *)tps53688},
{}
};
MODULE_DEVICE_TABLE(of, tps53679_of_match);
static struct i2c_driver tps53679_driver = {
.driver = {
.name = "tps53679",
.of_match_table = of_match_ptr(tps53679_of_match),
},
.probe_new = tps53679_probe,
.id_table = tps53679_id,
};
module_i2c_driver(tps53679_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("PMBus driver for Texas Instruments TPS53679");
MODULE_LICENSE("GPL");
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