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