261 lines
7 KiB
C
261 lines
7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2993)
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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/of_device.h>
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#include "pmbus.h"
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#define MP2993_VOUT_OVUV_UINT 125
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#define MP2993_VOUT_OVUV_DIV 64
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#define MP2993_VIN_LIMIT_UINT 1
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#define MP2993_VIN_LIMIT_DIV 8
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#define MP2993_READ_VIN_UINT 1
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#define MP2993_READ_VIN_DIV 32
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#define MP2993_PAGE_NUM 2
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#define MP2993_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | \
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PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \
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PMBUS_HAVE_TEMP | PMBUS_HAVE_PIN | \
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PMBUS_HAVE_IIN | \
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PMBUS_HAVE_STATUS_VOUT | \
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PMBUS_HAVE_STATUS_IOUT | \
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PMBUS_HAVE_STATUS_TEMP | \
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PMBUS_HAVE_STATUS_INPUT)
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#define MP2993_RAIL2_FUNC (PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \
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PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \
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PMBUS_HAVE_STATUS_VOUT | \
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PMBUS_HAVE_STATUS_IOUT | \
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PMBUS_HAVE_STATUS_TEMP | \
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PMBUS_HAVE_STATUS_INPUT)
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/* Converts a linear11 data exponent to a specified value */
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static u16 mp2993_linear11_exponent_transfer(u16 word, u16 expect_exponent)
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{
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s16 exponent, mantissa, target_exponent;
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exponent = ((s16)word) >> 11;
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mantissa = ((s16)((word & 0x7ff) << 5)) >> 5;
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target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11;
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if (exponent > target_exponent)
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mantissa = mantissa << (exponent - target_exponent);
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else
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mantissa = mantissa >> (target_exponent - exponent);
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return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800);
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}
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static int
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mp2993_set_vout_format(struct i2c_client *client, int page, int format)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
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if (ret < 0)
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return ret;
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return i2c_smbus_write_byte_data(client, PMBUS_VOUT_MODE, format);
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}
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static int mp2993_identify(struct i2c_client *client, struct pmbus_driver_info *info)
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{
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int ret;
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/* Set vout to direct format for rail1. */
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ret = mp2993_set_vout_format(client, 0, PB_VOUT_MODE_DIRECT);
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if (ret < 0)
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return ret;
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/* Set vout to direct format for rail2. */
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return mp2993_set_vout_format(client, 1, PB_VOUT_MODE_DIRECT);
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}
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static int mp2993_read_word_data(struct i2c_client *client, int page, int phase,
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int reg)
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{
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int ret;
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switch (reg) {
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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ret = pmbus_read_word_data(client, page, phase, reg);
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if (ret < 0)
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return ret;
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ret = DIV_ROUND_CLOSEST(ret * MP2993_VOUT_OVUV_UINT, MP2993_VOUT_OVUV_DIV);
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break;
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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/*
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* The MP2993 ot fault limit value and ot warn limit value
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* per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
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* and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
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* indicates the limit value.
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*/
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ret = pmbus_read_word_data(client, 0, phase, reg);
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break;
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case PMBUS_READ_VIN:
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/* The MP2993 vin scale is (1/32V)/Lsb */
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ret = pmbus_read_word_data(client, page, phase, reg);
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if (ret < 0)
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return ret;
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ret = DIV_ROUND_CLOSEST((ret & GENMASK(9, 0)) * MP2993_READ_VIN_UINT,
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MP2993_READ_VIN_DIV);
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break;
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case PMBUS_VIN_OV_FAULT_LIMIT:
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case PMBUS_VIN_OV_WARN_LIMIT:
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case PMBUS_VIN_UV_WARN_LIMIT:
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case PMBUS_VIN_UV_FAULT_LIMIT:
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/* The MP2993 vin limit scale is (1/8V)/Lsb */
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ret = pmbus_read_word_data(client, page, phase, reg);
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if (ret < 0)
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return ret;
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ret = DIV_ROUND_CLOSEST((ret & GENMASK(7, 0)) * MP2993_VIN_LIMIT_UINT,
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MP2993_VIN_LIMIT_DIV);
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break;
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case PMBUS_READ_IOUT:
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case PMBUS_READ_IIN:
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case PMBUS_IIN_OC_WARN_LIMIT:
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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case PMBUS_READ_VOUT:
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case PMBUS_READ_PIN:
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case PMBUS_READ_POUT:
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case PMBUS_READ_TEMPERATURE_1:
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ret = -ENODATA;
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static int mp2993_write_word_data(struct i2c_client *client, int page, int reg,
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u16 word)
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{
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int ret;
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switch (reg) {
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case PMBUS_VOUT_OV_FAULT_LIMIT:
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case PMBUS_VOUT_UV_FAULT_LIMIT:
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ret = DIV_ROUND_CLOSEST(word * MP2993_VOUT_OVUV_DIV, MP2993_VOUT_OVUV_UINT);
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ret = pmbus_write_word_data(client, 0, reg, ret);
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break;
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case PMBUS_OT_FAULT_LIMIT:
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case PMBUS_OT_WARN_LIMIT:
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/*
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* The MP2993 ot fault limit value and ot warn limit value
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* per rail are always the same, so only PMBUS_OT_FAULT_LIMIT
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* and PMBUS_OT_WARN_LIMIT register in page 0 are defined to
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* config the ot limit value.
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*/
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ret = pmbus_write_word_data(client, 0, reg, word);
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break;
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case PMBUS_VIN_OV_FAULT_LIMIT:
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case PMBUS_VIN_OV_WARN_LIMIT:
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case PMBUS_VIN_UV_WARN_LIMIT:
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case PMBUS_VIN_UV_FAULT_LIMIT:
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/* The MP2993 vin limit scale is (1/8V)/Lsb */
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ret = pmbus_write_word_data(client, 0, reg,
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DIV_ROUND_CLOSEST(word * MP2993_VIN_LIMIT_DIV,
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MP2993_VIN_LIMIT_UINT));
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break;
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case PMBUS_IIN_OC_WARN_LIMIT:
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/*
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* The PMBUS_IIN_OC_WARN_LIMIT of MP2993 is linear11 format,
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* and the exponent is a constant value(5'b00000)， so the
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* exponent of word parameter should be converted to 5'b00000.
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*/
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ret = pmbus_write_word_data(client, page, reg,
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mp2993_linear11_exponent_transfer(word, 0x00));
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break;
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//
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case PMBUS_IOUT_OC_FAULT_LIMIT:
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case PMBUS_IOUT_OC_WARN_LIMIT:
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/*
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* The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT
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* of MP2993 can be regarded as linear11 format, and the
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* exponent is a 5'b00001 or 5'b00000. To ensure a larger
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* range of limit value, so the exponent of word parameter
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* should be converted to 5'b00001.
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*/
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ret = pmbus_write_word_data(client, page, reg,
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mp2993_linear11_exponent_transfer(word, 0x01));
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break;
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default:
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ret = -EINVAL;
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break;
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}
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return ret;
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}
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static struct pmbus_driver_info mp2993_info = {
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.pages = MP2993_PAGE_NUM,
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.format[PSC_VOLTAGE_IN] = direct,
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.format[PSC_CURRENT_IN] = linear,
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.format[PSC_CURRENT_OUT] = linear,
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.format[PSC_TEMPERATURE] = direct,
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.format[PSC_POWER] = linear,
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.format[PSC_VOLTAGE_OUT] = direct,
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.m[PSC_VOLTAGE_OUT] = 1,
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.R[PSC_VOLTAGE_OUT] = 3,
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.b[PSC_VOLTAGE_OUT] = 0,
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.m[PSC_VOLTAGE_IN] = 1,
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.R[PSC_VOLTAGE_IN] = 0,
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.b[PSC_VOLTAGE_IN] = 0,
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.m[PSC_TEMPERATURE] = 1,
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.R[PSC_TEMPERATURE] = 0,
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.b[PSC_TEMPERATURE] = 0,
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.func[0] = MP2993_RAIL1_FUNC,
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.func[1] = MP2993_RAIL2_FUNC,
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.read_word_data = mp2993_read_word_data,
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.write_word_data = mp2993_write_word_data,
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.identify = mp2993_identify,
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};
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static int mp2993_probe(struct i2c_client *client)
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{
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return pmbus_do_probe(client, &mp2993_info);
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}
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static const struct i2c_device_id mp2993_id[] = {
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{"mp2993", 0},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mp2993_id);
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static const struct of_device_id __maybe_unused mp2993_of_match[] = {
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{.compatible = "mps,mp2993"},
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{}
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};
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MODULE_DEVICE_TABLE(of, mp2993_of_match);
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static struct i2c_driver mp2993_driver = {
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.driver = {
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.name = "mp2993",
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.of_match_table = mp2993_of_match,
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},
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.probe = mp2993_probe,
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.id_table = mp2993_id,
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};
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module_i2c_driver(mp2993_driver);
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MODULE_AUTHOR("Noah Wang <noahwang.wang@outlook.com>");
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MODULE_DESCRIPTION("PMBus driver for MPS MP2993");
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MODULE_LICENSE("GPL");
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MODULE_IMPORT_NS(PMBUS);
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