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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Hardware monitoring driver for Infineon Multi-phase Digital VR Controllers
*
* Copyright (c) 2020 Mellanox Technologies. All rights reserved.
*/
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include "pmbus.h"
#define XDPE122_PROT_VR12_5MV 0x01 /* VR12.0 mode, 5-mV DAC */
#define XDPE122_PROT_VR12_5_10MV 0x02 /* VR12.5 mode, 10-mV DAC */
#define XDPE122_PROT_IMVP9_10MV 0x03 /* IMVP9 mode, 10-mV DAC */
#define XDPE122_AMD_625MV 0x10 /* AMD mode 6.25mV */
#define XDPE122_PAGE_NUM 2
static int xdpe122_read_word_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
long val;
s16 exponent;
s32 mantissa;
int ret;
switch (reg) {
case PMBUS_VOUT_OV_FAULT_LIMIT:
case PMBUS_VOUT_UV_FAULT_LIMIT:
ret = pmbus_read_word_data(client, page, reg);
if (ret < 0)
return ret;
/* Convert register value to LINEAR11 data. */
exponent = ((s16)ret) >> 11;
mantissa = ((s16)((ret & GENMASK(10, 0)) << 5)) >> 5;
val = mantissa * 1000L;
if (exponent >= 0)
val <<= exponent;
else
val >>= -exponent;
/* Convert data to VID register. */
switch (info->vrm_version[page]) {
case vr13:
if (val >= 500)
return 1 + DIV_ROUND_CLOSEST(val - 500, 10);
return 0;
case vr12:
if (val >= 250)
return 1 + DIV_ROUND_CLOSEST(val - 250, 5);
return 0;
case imvp9:
if (val >= 200)
return 1 + DIV_ROUND_CLOSEST(val - 200, 10);
return 0;
case amd625mv:
if (val >= 200 && val <= 1550)
return DIV_ROUND_CLOSEST((1550 - val) * 100,
625);
return 0;
default:
return -EINVAL;
}
default:
return -ENODATA;
}
return 0;
}
static int xdpe122_identify(struct i2c_client *client,
struct pmbus_driver_info *info)
{
u8 vout_params;
int i, ret;
for (i = 0; i < XDPE122_PAGE_NUM; 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 XDPE122_PROT_VR12_5_10MV:
info->vrm_version[i] = vr13;
break;
case XDPE122_PROT_VR12_5MV:
info->vrm_version[i] = vr12;
break;
case XDPE122_PROT_IMVP9_10MV:
info->vrm_version[i] = imvp9;
break;
case XDPE122_AMD_625MV:
info->vrm_version[i] = amd625mv;
break;
default:
return -EINVAL;
}
}
return 0;
}
static struct pmbus_driver_info xdpe122_info = {
.pages = XDPE122_PAGE_NUM,
.format[PSC_VOLTAGE_IN] = linear,
.format[PSC_VOLTAGE_OUT] = vid,
.format[PSC_TEMPERATURE] = linear,
.format[PSC_CURRENT_IN] = linear,
.format[PSC_CURRENT_OUT] = linear,
.format[PSC_POWER] = linear,
.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
.func[1] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT |
PMBUS_HAVE_IIN | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT |
PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP |
PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT,
.identify = xdpe122_identify,
.read_word_data = xdpe122_read_word_data,
};
static int xdpe122_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct pmbus_driver_info *info;
info = devm_kmemdup(&client->dev, &xdpe122_info, sizeof(*info),
GFP_KERNEL);
if (!info)
return -ENOMEM;
return pmbus_do_probe(client, id, info);
}
static const struct i2c_device_id xdpe122_id[] = {
{"xdpe12254", 0},
{"xdpe12284", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, xdpe122_id);
static const struct of_device_id __maybe_unused xdpe122_of_match[] = {
{.compatible = "infineon,xdpe12254"},
{.compatible = "infineon,xdpe12284"},
{}
};
MODULE_DEVICE_TABLE(of, xdpe122_of_match);
static struct i2c_driver xdpe122_driver = {
.driver = {
.name = "xdpe12284",
.of_match_table = of_match_ptr(xdpe122_of_match),
},
.probe = xdpe122_probe,
.remove = pmbus_do_remove,
.id_table = xdpe122_id,
};
module_i2c_driver(xdpe122_driver);
MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
MODULE_DESCRIPTION("PMBus driver for Infineon XDPE122 family");
MODULE_LICENSE("GPL");
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