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mirror-linux/drivers/hwmon/pmbus/mp29502.c

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP29502)
*/
#include <linux/bitfield.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include "pmbus.h"
#define MFR_VOUT_SCALE_LOOP 0x29
#define MFR_SVI3_IOUT_PRT 0x67
#define MFR_READ_PIN_EST 0x94
#define MFR_READ_IIN_EST 0x95
#define MFR_VOUT_PROT1 0x3D
#define MFR_VOUT_PROT2 0x51
#define MFR_SLOPE_CNT_SET 0xA8
#define MFR_TSNS_FLT_SET 0xBB
#define MP29502_VIN_OV_GAIN 4
#define MP29502_TEMP_LIMIT_OFFSET 40
#define MP29502_READ_VOUT_DIV 1024
#define MP29502_READ_IOUT_DIV 32
#define MP29502_IOUT_LIMIT_UINT 8
#define MP29502_OVUV_LIMIT_SCALE 10
#define MP28502_VOUT_OV_GAIN 512
#define MP28502_VOUT_OV_SCALE 40
#define MP29502_VOUT_UV_OFFSET 36
#define MP29502_PIN_GAIN 2
#define MP29502_IIN_DIV 2
#define MP29502_PAGE_NUM 1
#define MP29502_RAIL_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \
PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \
PMBUS_HAVE_IIN | \
PMBUS_HAVE_STATUS_VOUT | \
PMBUS_HAVE_STATUS_IOUT | \
PMBUS_HAVE_STATUS_TEMP | \
PMBUS_HAVE_STATUS_INPUT)
struct mp29502_data {
struct pmbus_driver_info info;
int vout_scale;
int vout_bottom_div;
int vout_top_div;
int ovp_div;
int iout_scale;
};
#define to_mp29502_data(x) container_of(x, struct mp29502_data, info)
static u16 mp29502_reg2data_linear11(u16 word)
{
s16 exponent;
s32 mantissa;
s64 val;
exponent = ((s16)word) >> 11;
mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
val = mantissa;
if (exponent >= 0)
val <<= exponent;
else
val >>= -exponent;
return val;
}
static int
mp29502_identify_vout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp29502_data *data = to_mp29502_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_VOUT_SCALE_LOOP);
if (ret < 0)
return ret;
switch (FIELD_GET(GENMASK(12, 10), ret)) {
case 0:
data->vout_scale = 6400;
break;
case 1:
data->vout_scale = 5120;
break;
case 2:
data->vout_scale = 2560;
break;
case 3:
data->vout_scale = 2048;
break;
case 4:
data->vout_scale = 1024;
break;
case 5:
data->vout_scale = 4;
break;
case 6:
data->vout_scale = 2;
break;
case 7:
data->vout_scale = 1;
break;
default:
data->vout_scale = 1;
break;
}
return 0;
}
static int
mp29502_identify_vout_divider(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp29502_data *data = to_mp29502_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_VOUT_PROT1);
if (ret < 0)
return ret;
data->vout_bottom_div = FIELD_GET(GENMASK(11, 0), ret);
ret = i2c_smbus_read_word_data(client, MFR_VOUT_PROT2);
if (ret < 0)
return ret;
data->vout_top_div = FIELD_GET(GENMASK(14, 0), ret);
return 0;
}
static int
mp29502_identify_ovp_divider(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp29502_data *data = to_mp29502_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_SLOPE_CNT_SET);
if (ret < 0)
return ret;
data->ovp_div = FIELD_GET(GENMASK(9, 0), ret);
return 0;
}
static int
mp29502_identify_iout_scale(struct i2c_client *client, struct pmbus_driver_info *info,
int page)
{
struct mp29502_data *data = to_mp29502_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_SVI3_IOUT_PRT);
if (ret < 0)
return ret;
switch (ret & GENMASK(2, 0)) {
case 0:
case 6:
data->iout_scale = 32;
break;
case 1:
data->iout_scale = 1;
break;
case 2:
data->iout_scale = 2;
break;
case 3:
data->iout_scale = 4;
break;
case 4:
data->iout_scale = 8;
break;
case 5:
data->iout_scale = 16;
break;
default:
data->iout_scale = 64;
break;
}
return 0;
}
static int mp29502_read_vout_ov_limit(struct i2c_client *client, struct mp29502_data *data)
{
int ret;
int ov_value;
/*
* This is because the vout ov fault limit value comes from
* page1 MFR_TSNS_FLT_SET reg, and other telemetry and limit
* value comes from page0 reg. So the page should be set to
* 0 after the reading of vout ov limit.
*/
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 1);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_TSNS_FLT_SET);
if (ret < 0)
return ret;
ov_value = DIV_ROUND_CLOSEST(FIELD_GET(GENMASK(12, 7), ret) *
MP28502_VOUT_OV_GAIN * MP28502_VOUT_OV_SCALE,
data->ovp_div);
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
return ov_value;
}
static int mp29502_write_vout_ov_limit(struct i2c_client *client, u16 word,
struct mp29502_data *data)
{
int ret;
/*
* This is because the vout ov fault limit value comes from
* page1 MFR_TSNS_FLT_SET reg, and other telemetry and limit
* value comes from page0 reg. So the page should be set to
* 0 after the writing of vout ov limit.
*/
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 1);
if (ret < 0)
return ret;
ret = i2c_smbus_read_word_data(client, MFR_TSNS_FLT_SET);
if (ret < 0)
return ret;
ret = i2c_smbus_write_word_data(client, MFR_TSNS_FLT_SET,
(ret & ~GENMASK(12, 7)) |
FIELD_PREP(GENMASK(12, 7),
DIV_ROUND_CLOSEST(word * data->ovp_div,
MP28502_VOUT_OV_GAIN * MP28502_VOUT_OV_SCALE)));
return i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
}
static int mp29502_read_byte_data(struct i2c_client *client, int page, int reg)
{
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
switch (reg) {
case PMBUS_VOUT_MODE:
ret = PB_VOUT_MODE_DIRECT;
break;
default:
ret = -ENODATA;
break;
}
return ret;
}
static int mp29502_read_word_data(struct i2c_client *client, int page,
int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp29502_data *data = to_mp29502_data(info);
int ret;
switch (reg) {
case PMBUS_STATUS_WORD:
ret = -ENODATA;
break;
case PMBUS_READ_VIN:
/*
* The MP29502 PMBUS_READ_VIN[10:0] is the vin value, the vin scale is
* 125mV/LSB. And the vin scale is set to 125mV/Lsb(using r/m/b scale)
* in MP29502 pmbus_driver_info struct, so the word data bit0-bit10 can
* be returned to pmbus core directly.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = FIELD_GET(GENMASK(10, 0), ret);
break;
case PMBUS_READ_VOUT:
/*
* The MP29502 PMBUS_READ_VOUT[11:0] is the vout value, and vout
* value is calculated based on vout scale and vout divider.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(11, 0)) *
data->vout_scale *
(data->vout_bottom_div +
4 * data->vout_top_div),
MP29502_READ_VOUT_DIV *
data->vout_bottom_div);
break;
case PMBUS_READ_IIN:
/*
* The MP29502 MFR_READ_IIN_EST register is linear11 format, and the
* exponent is not a constant value. But the iin scale is set to
* 1A/Lsb(using r/m/b scale). As a result, the iin read from MP29502
* should be calculated to A, then return the result to pmbus core.
*/
ret = pmbus_read_word_data(client, page, phase, MFR_READ_IIN_EST);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(mp29502_reg2data_linear11(ret),
MP29502_IIN_DIV);
break;
case PMBUS_READ_PIN:
/*
* The MP29502 MFR_READ_PIN_EST register is linear11 format, and the
* exponent is not a constant value. But the pin scale is set to
* 1W/Lsb(using r/m/b scale). As a result, the pout read from MP29502
* should be calculated to W, then return the result to pmbus core.
*/
ret = pmbus_read_word_data(client, page, phase, MFR_READ_PIN_EST);
if (ret < 0)
return ret;
ret = mp29502_reg2data_linear11(ret) * MP29502_PIN_GAIN;
break;
case PMBUS_READ_POUT:
/*
* The MP29502 PMBUS_READ_POUT register is linear11 format, and the
* exponent is not a constant value. But the pout scale is set to
* 1W/Lsb(using r/m/b scale). As a result, the pout read from MP29502
* should be calculated to W, then return the result to pmbus core.
* And the pout is calculated based on vout divider.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST(mp29502_reg2data_linear11(ret) *
(data->vout_bottom_div +
4 * data->vout_top_div),
data->vout_bottom_div);
break;
case PMBUS_READ_IOUT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(10, 0)) * data->iout_scale,
MP29502_READ_IOUT_DIV);
break;
case PMBUS_READ_TEMPERATURE_1:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = FIELD_GET(GENMASK(10, 0), ret);
break;
case PMBUS_VIN_OV_FAULT_LIMIT:
/*
* The MP29502 PMBUS_VIN_OV_FAULT_LIMIT is 500mV/Lsb, but
* the vin scale is set to 125mV/Lsb(using r/m/b scale),
* so the word data should multiply by 4.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = FIELD_GET(GENMASK(7, 0), ret) * MP29502_VIN_OV_GAIN;
break;
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
/*
* The MP29502 PMBUS_VIN_UV_WARN_LIMIT and PMBUS_VIN_UV_FAULT_LIMIT
* scale is 125mV/Lsb, but the vin scale is set to 125mV/Lsb(using
* r/m/b scale), so the word data bit0-bit9 can be returned to pmbus
* core directly.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = FIELD_GET(GENMASK(9, 0), ret);
break;
case PMBUS_VOUT_OV_FAULT_LIMIT:
/*
* The MP29502 vout ov fault limit value comes from
* page1 MFR_TSNS_FLT_SET[12:7].
*/
ret = mp29502_read_vout_ov_limit(client, data);
if (ret < 0)
return ret;
break;
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((FIELD_GET(GENMASK(8, 0), ret) *
MP29502_OVUV_LIMIT_SCALE -
MP29502_VOUT_UV_OFFSET) *
(data->vout_bottom_div +
4 * data->vout_top_div),
data->vout_bottom_div);
break;
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) *
data->iout_scale *
MP29502_IOUT_LIMIT_UINT,
MP29502_READ_IOUT_DIV);
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The scale of MP29502 PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT
* is 1°C/LSB and they have 40°C offset.
*/
ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
ret = (ret & GENMASK(7, 0)) - MP29502_TEMP_LIMIT_OFFSET;
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int mp29502_write_word_data(struct i2c_client *client, int page, int reg,
u16 word)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct mp29502_data *data = to_mp29502_data(info);
int ret;
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
if (ret < 0)
return ret;
switch (reg) {
case PMBUS_VIN_OV_FAULT_LIMIT:
/*
* The PMBUS_VIN_OV_FAULT_LIMIT[7:0] is the limit value,
* and bit8-bit15 should not be changed. The scale of
* PMBUS_VIN_OV_FAULT_LIMIT is 500mV/Lsb, but the vin
* scale is set to 125mV/Lsb(using r/m/b scale), so
* the word data should divide by 4.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
DIV_ROUND_CLOSEST(word,
MP29502_VIN_OV_GAIN)));
break;
case PMBUS_VIN_UV_WARN_LIMIT:
case PMBUS_VIN_UV_FAULT_LIMIT:
/*
* The PMBUS_VIN_UV_WARN_LIMIT[9:0] and PMBUS_VIN_UV_FAULT_LIMIT[9:0]
* are the limit value, and bit10-bit15 should not be changed.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(9, 0)) |
FIELD_PREP(GENMASK(9, 0),
word));
break;
case PMBUS_VOUT_OV_FAULT_LIMIT:
ret = mp29502_write_vout_ov_limit(client, word, data);
if (ret < 0)
return ret;
break;
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(8, 0)) |
FIELD_PREP(GENMASK(8, 0),
DIV_ROUND_CLOSEST(word *
data->vout_bottom_div +
MP29502_VOUT_UV_OFFSET *
(data->vout_bottom_div +
4 * data->vout_top_div),
MP29502_OVUV_LIMIT_SCALE *
(data->vout_bottom_div +
4 * data->vout_top_div))));
break;
case PMBUS_IOUT_OC_FAULT_LIMIT:
case PMBUS_IOUT_OC_WARN_LIMIT:
ret = pmbus_write_word_data(client, page, reg,
DIV_ROUND_CLOSEST(word *
MP29502_READ_IOUT_DIV,
MP29502_IOUT_LIMIT_UINT *
data->iout_scale));
break;
case PMBUS_OT_FAULT_LIMIT:
case PMBUS_OT_WARN_LIMIT:
/*
* The PMBUS_OT_FAULT_LIMIT[7:0] and PMBUS_OT_WARN_LIMIT[7:0]
* are the limit value, and bit8-bit15 should not be changed.
*/
ret = pmbus_read_word_data(client, page, 0xff, reg);
if (ret < 0)
return ret;
ret = pmbus_write_word_data(client, page, reg,
(ret & ~GENMASK(7, 0)) |
FIELD_PREP(GENMASK(7, 0),
word + MP29502_TEMP_LIMIT_OFFSET));
break;
default:
ret = -EINVAL;
break;
}
return ret;
}
static int mp29502_identify(struct i2c_client *client, struct pmbus_driver_info *info)
{
int ret;
/* Identify vout scale */
ret = mp29502_identify_vout_scale(client, info, 0);
if (ret < 0)
return ret;
/* Identify vout divider. */
ret = mp29502_identify_vout_divider(client, info, 1);
if (ret < 0)
return ret;
/* Identify ovp divider. */
ret = mp29502_identify_ovp_divider(client, info, 1);
if (ret < 0)
return ret;
/* Identify iout scale */
return mp29502_identify_iout_scale(client, info, 0);
}
static const struct pmbus_driver_info mp29502_info = {
.pages = MP29502_PAGE_NUM,
.format[PSC_VOLTAGE_IN] = direct,
.format[PSC_TEMPERATURE] = direct,
.format[PSC_CURRENT_IN] = direct,
.format[PSC_CURRENT_OUT] = direct,
.format[PSC_VOLTAGE_OUT] = direct,
.format[PSC_POWER] = direct,
.m[PSC_VOLTAGE_IN] = 8,
.R[PSC_VOLTAGE_IN] = 0,
.b[PSC_VOLTAGE_IN] = 0,
.m[PSC_VOLTAGE_OUT] = 1,
.R[PSC_VOLTAGE_OUT] = 3,
.b[PSC_VOLTAGE_OUT] = 0,
.m[PSC_TEMPERATURE] = 1,
.R[PSC_TEMPERATURE] = 0,
.b[PSC_TEMPERATURE] = 0,
.m[PSC_CURRENT_IN] = 1,
.R[PSC_CURRENT_IN] = 0,
.b[PSC_CURRENT_IN] = 0,
.m[PSC_CURRENT_OUT] = 1,
.R[PSC_CURRENT_OUT] = 0,
.b[PSC_CURRENT_OUT] = 0,
.m[PSC_POWER] = 1,
.R[PSC_POWER] = 0,
.b[PSC_POWER] = 0,
.func[0] = MP29502_RAIL_FUNC,
.read_word_data = mp29502_read_word_data,
.read_byte_data = mp29502_read_byte_data,
.write_word_data = mp29502_write_word_data,
.identify = mp29502_identify,
};
static int mp29502_probe(struct i2c_client *client)
{
struct pmbus_driver_info *info;
struct mp29502_data *data;
data = devm_kzalloc(&client->dev, sizeof(struct mp29502_data),
GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(&data->info, &mp29502_info, sizeof(*info));
info = &data->info;
return pmbus_do_probe(client, info);
}
static const struct i2c_device_id mp29502_id[] = {
{"mp29502", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mp29502_id);
static const struct of_device_id __maybe_unused mp29502_of_match[] = {
{.compatible = "mps,mp29502"},
{}
};
MODULE_DEVICE_TABLE(of, mp29502_of_match);
static struct i2c_driver mp29502_driver = {
.driver = {
.name = "mp29502",
.of_match_table = mp29502_of_match,
},
.probe = mp29502_probe,
.id_table = mp29502_id,
};
module_i2c_driver(mp29502_driver);
MODULE_AUTHOR("Wensheng Wang <wenswang@yeah.net");
MODULE_DESCRIPTION("PMBus driver for MPS MP29502");
MODULE_LICENSE("GPL");
MODULE_IMPORT_NS("PMBUS");
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