161 lines
4.4 KiB
C
161 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Hardware monitoring driver for Infineon XDP720 / XDP730 Digital
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* eFuse Controllers.
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*
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* Both parts share the same PMBus register map and direct-format
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* coefficients; they differ in the GIMON gain step exposed via
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* the TELEMETRY_AVG register and in the VDD_VIN pin number.
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*
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* Copyright (c) 2026 Infineon Technologies. All rights reserved.
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*/
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/of_device.h>
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#include <linux/bitops.h>
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#include <linux/math64.h>
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#include <linux/property.h>
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#include <linux/regulator/consumer.h>
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#include "pmbus.h"
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/*
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* The IMON resistor required to generate the system overcurrent protection.
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* Arbitrary default Rimon value: 2k Ohm
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*/
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#define XDP720_DEFAULT_RIMON 2000000000U /* 2k ohm */
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#define XDP720_TELEMETRY_AVG 0xE9
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#define XDP720_TELEMETRY_AVG_GIMON BIT(10) /* high/low GIMON select */
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/* Chip identifiers carried in OF match-data and i2c_device_id->driver_data. */
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enum xdp720_chip_id {
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CHIP_XDP720 = 0,
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CHIP_XDP730,
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};
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struct xdp720_data {
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enum xdp720_chip_id id;
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struct pmbus_driver_info info;
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};
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static const struct pmbus_driver_info xdp720_info = {
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.pages = 1,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_VOLTAGE_OUT] = direct,
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.format[PSC_CURRENT_OUT] = direct,
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.format[PSC_POWER] = direct,
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.format[PSC_TEMPERATURE] = direct,
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.m[PSC_VOLTAGE_IN] = 4653,
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.b[PSC_VOLTAGE_IN] = 0,
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.R[PSC_VOLTAGE_IN] = -2,
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.m[PSC_VOLTAGE_OUT] = 4653,
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.b[PSC_VOLTAGE_OUT] = 0,
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.R[PSC_VOLTAGE_OUT] = -2,
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/*
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* Current and Power measurement depends on the RIMON (kOhm) and
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* GIMON(microA/A) values.
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*/
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.m[PSC_CURRENT_OUT] = 24668,
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.b[PSC_CURRENT_OUT] = 0,
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.R[PSC_CURRENT_OUT] = -4,
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.m[PSC_POWER] = 4486,
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.b[PSC_POWER] = 0,
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.R[PSC_POWER] = -1,
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.m[PSC_TEMPERATURE] = 54,
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.b[PSC_TEMPERATURE] = 22521,
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.R[PSC_TEMPERATURE] = -1,
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.func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_PIN |
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PMBUS_HAVE_TEMP | PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_INPUT |
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PMBUS_HAVE_STATUS_TEMP,
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};
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static int xdp720_probe(struct i2c_client *client)
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{
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struct xdp720_data *data;
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int ret;
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u32 rimon;
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int gimon;
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data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->id = (enum xdp720_chip_id)(uintptr_t)i2c_get_match_data(client);
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data->info = xdp720_info;
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ret = devm_regulator_get_enable(&client->dev, "vdd-vin");
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if (ret)
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return dev_err_probe(&client->dev, ret,
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"failed to enable vdd-vin supply\n");
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ret = i2c_smbus_read_word_data(client, XDP720_TELEMETRY_AVG);
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if (ret < 0) {
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dev_err(&client->dev, "Can't get TELEMETRY_AVG\n");
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return ret;
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}
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/* Bit 10 of TELEMETRY_AVG selects the GIMON gain step in microA/A */
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switch (data->id) {
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case CHIP_XDP720:
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gimon = (ret & XDP720_TELEMETRY_AVG_GIMON) ? 18200 : 9100;
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dev_info(&client->dev, "Initialised XDP720 instance\n");
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break;
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case CHIP_XDP730:
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gimon = (ret & XDP720_TELEMETRY_AVG_GIMON) ? 20000 : 10000;
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dev_info(&client->dev, "Initialised XDP730 instance\n");
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break;
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default:
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return -EINVAL;
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}
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if (device_property_read_u32(&client->dev,
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"infineon,rimon-micro-ohms", &rimon))
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rimon = XDP720_DEFAULT_RIMON; /* Default if not in FW */
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if (rimon == 0)
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return -EINVAL;
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/* Adapt the current and power scale for each instance */
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data->info.m[PSC_CURRENT_OUT] = DIV64_U64_ROUND_CLOSEST((u64)
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data->info.m[PSC_CURRENT_OUT] * rimon * gimon,
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1000000000000ULL);
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data->info.m[PSC_POWER] = DIV64_U64_ROUND_CLOSEST((u64)
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data->info.m[PSC_POWER] * rimon * gimon,
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1000000000000000ULL);
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return pmbus_do_probe(client, &data->info);
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}
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static const struct of_device_id xdp720_of_match[] = {
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{ .compatible = "infineon,xdp720", .data = (void *)CHIP_XDP720 },
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{ .compatible = "infineon,xdp730", .data = (void *)CHIP_XDP730 },
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{}
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};
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MODULE_DEVICE_TABLE(of, xdp720_of_match);
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static const struct i2c_device_id xdp720_id[] = {
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{ .name = "xdp720", .driver_data = CHIP_XDP720 },
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{ .name = "xdp730", .driver_data = CHIP_XDP730 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, xdp720_id);
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static struct i2c_driver xdp720_driver = {
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.driver = {
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.name = "xdp720",
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.of_match_table = xdp720_of_match,
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},
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.probe = xdp720_probe,
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.id_table = xdp720_id,
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};
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module_i2c_driver(xdp720_driver);
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MODULE_AUTHOR("Ashish Yadav <ashish.yadav@infineon.com>");
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MODULE_DESCRIPTION("PMBus driver for Infineon XDP720/XDP730 Digital eFuse Controllers");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS("PMBUS");
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