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hwmon: (pmbus) Add support for MPS Multi-phase mp2856/mp2857 controller
Add support for mp2856/mp2857 device from Monolithic Power Systems, Inc. (MPS) vendor. This is a dual-loop, digital, multi-phase, modulation controller. Signed-off-by: Peter Yin <peteryin.openbmc@gmail.com> Signed-off-by: Potin Lai <potin.lai.pt@gmail.com> Link: https://lore.kernel.org/r/20231211160519.21254-3-potin.lai.pt@gmail.com [groeck: Fix checkpatch issues, use i2c_get_match_data()] Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Peter Yin
Guenter Roeck
parent
956cf0986a
commit
f9e5f289b6
@ -158,6 +158,7 @@ Hardware Monitoring Kernel Drivers
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mcp3021
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menf21bmc
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mlxreg-fan
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mp2856
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mp2888
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mp2975
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mp5023
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98
Documentation/hwmon/mp2856.rst
Normal file
98
Documentation/hwmon/mp2856.rst
Normal file
@ -0,0 +1,98 @@
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.. SPDX-License-Identifier: GPL-2.0
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Kernel driver mp2856
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====================
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Supported chips:
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* MPS MP2856
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Prefix: 'mp2856'
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* MPS MP2857
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Prefix: 'mp2857'
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Author:
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Peter Yin <peter.yin@quantatw.com>
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Description
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-----------
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This driver implements support for Monolithic Power Systems, Inc. (MPS)
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vendor dual-loop, digital, multi-phase controller MP2856/MP2857
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This device:
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- Supports up to two power rail.
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- Supports two pages 0 and 1 for and also pages 2 for configuration.
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- Can configured VOUT readout in direct or VID format and allows
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setting of different formats on rails 1 and 2. For VID the following
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protocols are available: AMD SVI3 mode with 5-mV/LSB.
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Device supports:
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- SVID interface.
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- AVSBus interface.
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Device compliant with:
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- PMBus rev 1.3 interface.
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Device supports direct format for reading output current, output voltage,
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input and output power and temperature.
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Device supports linear format for reading input voltage and input power.
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Device supports VID and direct formats for reading output voltage.
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The below VID modes are supported: AMD SVI3.
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The driver provides the following sysfs attributes for current measurements:
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- indexes 1 for "iin";
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- indexes 2, 3 for "iout";
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**curr[1-3]_alarm**
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**curr[1-3]_input**
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**curr[1-3]_label**
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The driver provides the following sysfs attributes for voltage measurements.
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- indexes 1 for "vin";
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- indexes 2, 3 for "vout";
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**in[1-3]_crit**
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**in[1-3]_crit_alarm**
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**in[1-3]_input**
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**in[1-3]_label**
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**in[1-3]_lcrit**
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**in[1-3]_lcrit_alarm**
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The driver provides the following sysfs attributes for power measurements.
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- indexes 1 for "pin";
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- indexes 2, 3 for "pout";
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**power[1-3]_alarm**
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**power[1-3]_input**
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**power[1-3]_label**
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The driver provides the following sysfs attributes for temperature measurements.
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**temp[1-2]_crit**
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**temp[1-2]_crit_alarm**
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**temp[1-2]_input**
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**temp[1-2]_max**
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**temp[1-2]_max_alarm**
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@ -309,6 +309,15 @@ config SENSORS_MAX8688
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This driver can also be built as a module. If so, the module will
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be called max8688.
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config SENSORS_MP2856
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tristate "MPS MP2856"
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help
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If you say yes here you get hardware monitoring support for MPS
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MP2856 MP2857 Dual Loop Digital Multi-Phase Controller.
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This driver can also be built as a module. If so, the module will
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be called mp2856.
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config SENSORS_MP2888
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tristate "MPS MP2888"
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help
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@ -33,6 +33,7 @@ obj-$(CONFIG_SENSORS_MAX20751) += max20751.o
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obj-$(CONFIG_SENSORS_MAX31785) += max31785.o
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obj-$(CONFIG_SENSORS_MAX34440) += max34440.o
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obj-$(CONFIG_SENSORS_MAX8688) += max8688.o
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obj-$(CONFIG_SENSORS_MP2856) += mp2856.o
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obj-$(CONFIG_SENSORS_MP2888) += mp2888.o
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obj-$(CONFIG_SENSORS_MP2975) += mp2975.o
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obj-$(CONFIG_SENSORS_MP5023) += mp5023.o
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466
drivers/hwmon/pmbus/mp2856.c
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466
drivers/hwmon/pmbus/mp2856.c
Normal file
@ -0,0 +1,466 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for MPS2856/2857
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* Monolithic Power Systems VR Controllers
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*
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* Copyright (C) 2023 Quanta Computer lnc.
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*/
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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/pmbus.h>
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#include "pmbus.h"
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/* Vendor specific registers. */
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#define MP2856_MFR_VR_MULTI_CONFIG_R1 0x0d
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#define MP2856_MFR_VR_MULTI_CONFIG_R2 0x1d
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#define MP2856_MUL1_BOOT_SR_R2 0x10
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#define MP2856_VR_ACTIVE BIT(15)
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#define MP2856_MFR_VR_CONFIG2 0x5e
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#define MP2856_VOUT_MODE BIT(11)
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#define MP2856_MFR_VR_CONFIG1 0x68
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#define MP2856_DRMOS_KCS GENMASK(13, 12)
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#define MP2856_MFR_READ_CS1_2_R1 0x82
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#define MP2856_MFR_READ_CS3_4_R1 0x83
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#define MP2856_MFR_READ_CS5_6_R1 0x84
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#define MP2856_MFR_READ_CS7_8_R1 0x85
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#define MP2856_MFR_READ_CS9_10_R1 0x86
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#define MP2856_MFR_READ_CS11_12_R1 0x87
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#define MP2856_MFR_READ_CS1_2_R2 0x85
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#define MP2856_MFR_READ_CS3_4_R2 0x86
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#define MP2856_MFR_READ_CS5_6_R2 0x87
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#define MP2856_MAX_PHASE_RAIL1 8
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#define MP2856_MAX_PHASE_RAIL2 4
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#define MP2857_MAX_PHASE_RAIL1 12
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#define MP2857_MAX_PHASE_RAIL2 4
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#define MP2856_PAGE_NUM 2
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enum chips { mp2856 = 1, mp2857 };
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static const int mp2856_max_phases[][MP2856_PAGE_NUM] = {
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[mp2856] = { MP2856_MAX_PHASE_RAIL1, MP2856_MAX_PHASE_RAIL2 },
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[mp2857] = { MP2857_MAX_PHASE_RAIL1, MP2857_MAX_PHASE_RAIL2 },
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};
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static const struct i2c_device_id mp2856_id[] = {
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{"mp2856", mp2856},
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{"mp2857", mp2857},
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{}
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};
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MODULE_DEVICE_TABLE(i2c, mp2856_id);
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struct mp2856_data {
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struct pmbus_driver_info info;
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int vout_format[MP2856_PAGE_NUM];
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int curr_sense_gain[MP2856_PAGE_NUM];
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int max_phases[MP2856_PAGE_NUM];
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enum chips chip_id;
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};
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#define to_mp2856_data(x) container_of(x, struct mp2856_data, info)
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#define MAX_LIN_MANTISSA (1023 * 1000)
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#define MIN_LIN_MANTISSA (511 * 1000)
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static u16 val2linear11(s64 val)
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{
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s16 exponent = 0, mantissa;
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bool negative = false;
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if (val == 0)
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return 0;
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if (val < 0) {
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negative = true;
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val = -val;
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}
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/* Reduce large mantissa until it fits into 10 bit */
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while (val >= MAX_LIN_MANTISSA && exponent < 15) {
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exponent++;
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val >>= 1;
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}
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/* Increase small mantissa to improve precision */
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while (val < MIN_LIN_MANTISSA && exponent > -15) {
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exponent--;
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val <<= 1;
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}
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/* Convert mantissa from milli-units to units */
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mantissa = clamp_val(DIV_ROUND_CLOSEST_ULL(val, 1000), 0, 0x3ff);
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/* restore sign */
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if (negative)
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mantissa = -mantissa;
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/* Convert to 5 bit exponent, 11 bit mantissa */
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return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
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}
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static int
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mp2856_read_word_helper(struct i2c_client *client, int page, int phase, u8 reg,
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u16 mask)
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{
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int ret = pmbus_read_word_data(client, page, phase, reg);
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return (ret > 0) ? ret & mask : ret;
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}
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static int
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mp2856_read_vout(struct i2c_client *client, struct mp2856_data *data, int page,
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int phase, u8 reg)
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{
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int ret;
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ret = mp2856_read_word_helper(client, page, phase, reg,
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GENMASK(9, 0));
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if (ret < 0)
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return ret;
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/* convert vout result to direct format */
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ret = (data->vout_format[page] == vid) ?
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((ret + 49) * 5) : ((ret * 1000) >> 8);
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return ret;
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}
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static int
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mp2856_read_phase(struct i2c_client *client, struct mp2856_data *data,
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int page, int phase, u8 reg)
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{
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int ret;
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int val;
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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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if (!((phase + 1) % MP2856_PAGE_NUM))
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ret >>= 8;
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ret &= 0xff;
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/*
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* Output value is calculated as: (READ_CSx * 12.5mV - 1.23V) / (Kcs * Rcs)
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*/
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val = (ret * 125) - 12300;
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return val2linear11(val);
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}
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static int
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mp2856_read_phases(struct i2c_client *client, struct mp2856_data *data,
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int page, int phase)
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{
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int ret;
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if (page == 0) {
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switch (phase) {
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case 0 ... 1:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS1_2_R1);
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break;
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case 2 ... 3:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS3_4_R1);
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break;
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case 4 ... 5:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS5_6_R1);
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break;
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case 6 ... 7:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS7_8_R1);
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break;
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default:
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return -ENODATA;
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}
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} else {
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switch (phase) {
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case 0 ... 1:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS1_2_R2);
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break;
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case 2 ... 3:
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ret = mp2856_read_phase(client, data, page, phase,
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MP2856_MFR_READ_CS1_2_R2);
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break;
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default:
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return -ENODATA;
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}
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}
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return ret;
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}
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static int
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mp2856_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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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct mp2856_data *data = to_mp2856_data(info);
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int ret;
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switch (reg) {
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case PMBUS_READ_VOUT:
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ret = mp2856_read_vout(client, data, page, phase, reg);
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break;
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case PMBUS_READ_IOUT:
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if (phase != 0xff)
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ret = mp2856_read_phases(client, data, page, phase);
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else
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ret = pmbus_read_word_data(client, page, phase, reg);
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break;
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default:
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return -ENODATA;
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}
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return ret;
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}
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static int
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mp2856_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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switch (reg) {
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case PMBUS_VOUT_MODE:
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/* Enforce VOUT direct format. */
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return PB_VOUT_MODE_DIRECT;
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default:
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return -ENODATA;
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}
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}
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static int
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mp2856_identify_multiphase(struct i2c_client *client, u8 reg, u8 max_phase,
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u16 mask)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_word_data(client, reg);
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if (ret < 0)
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return ret;
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ret &= mask;
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return (ret >= max_phase) ? max_phase : ret;
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}
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static int
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mp2856_identify_multiphase_rail1(struct i2c_client *client,
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struct mp2856_data *data)
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{
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int ret, i;
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ret = mp2856_identify_multiphase(client, MP2856_MFR_VR_MULTI_CONFIG_R1,
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MP2856_MAX_PHASE_RAIL1, GENMASK(3, 0));
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if (ret < 0)
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return ret;
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data->info.phases[0] = (ret > data->max_phases[0]) ?
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data->max_phases[0] : ret;
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for (i = 0 ; i < data->info.phases[0]; i++)
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data->info.pfunc[i] |= PMBUS_HAVE_IOUT;
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return 0;
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}
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static int
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mp2856_identify_multiphase_rail2(struct i2c_client *client,
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struct mp2856_data *data)
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{
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int ret, i;
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ret = mp2856_identify_multiphase(client, MP2856_MFR_VR_MULTI_CONFIG_R2,
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MP2856_MAX_PHASE_RAIL2, GENMASK(2, 0));
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if (ret < 0)
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return ret;
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data->info.phases[1] = (ret > data->max_phases[1]) ?
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data->max_phases[1] : ret;
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for (i = 0 ; i < data->info.phases[0]; i++)
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data->info.pfunc[i] |= PMBUS_HAVE_IOUT;
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return 0;
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}
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static int
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mp2856_current_sense_gain_get(struct i2c_client *client,
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struct mp2856_data *data)
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{
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int i, ret;
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/*
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* Obtain DrMOS current sense gain of power stage from the register
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* MP2856_MFR_VR_CONFIG1, bits 13-12. The value is selected as below:
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* 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other
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* values are invalid.
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*/
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for (i = 0 ; i < data->info.pages; i++) {
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ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_word_data(client,
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MP2856_MFR_VR_CONFIG1);
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if (ret < 0)
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return ret;
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switch ((ret & MP2856_DRMOS_KCS) >> 12) {
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case 0:
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data->curr_sense_gain[i] = 50;
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break;
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case 1:
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data->curr_sense_gain[i] = 85;
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break;
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case 2:
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data->curr_sense_gain[i] = 97;
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break;
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default:
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data->curr_sense_gain[i] = 100;
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break;
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}
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}
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return 0;
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}
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static int
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mp2856_identify_vout_format(struct i2c_client *client,
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struct mp2856_data *data)
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{
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int i, ret;
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for (i = 0; i < data->info.pages; i++) {
|
||||
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, i);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
ret = i2c_smbus_read_word_data(client, MP2856_MFR_VR_CONFIG2);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
data->vout_format[i] = (ret & MP2856_VOUT_MODE) ? linear : vid;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool
|
||||
mp2856_is_rail2_active(struct i2c_client *client)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 2);
|
||||
if (ret < 0)
|
||||
return true;
|
||||
|
||||
ret = i2c_smbus_read_word_data(client, MP2856_MUL1_BOOT_SR_R2);
|
||||
if (ret < 0)
|
||||
return true;
|
||||
|
||||
return (ret & MP2856_VR_ACTIVE) ? true : false;
|
||||
}
|
||||
|
||||
static struct pmbus_driver_info mp2856_info = {
|
||||
.pages = MP2856_PAGE_NUM,
|
||||
.format[PSC_VOLTAGE_IN] = linear,
|
||||
.format[PSC_VOLTAGE_OUT] = direct,
|
||||
.format[PSC_TEMPERATURE] = linear,
|
||||
.format[PSC_CURRENT_IN] = linear,
|
||||
.format[PSC_CURRENT_OUT] = linear,
|
||||
.format[PSC_POWER] = linear,
|
||||
.m[PSC_VOLTAGE_OUT] = 1,
|
||||
.R[PSC_VOLTAGE_OUT] = 3,
|
||||
.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_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT |
|
||||
PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP,
|
||||
.read_byte_data = mp2856_read_byte_data,
|
||||
.read_word_data = mp2856_read_word_data,
|
||||
};
|
||||
|
||||
static int mp2856_probe(struct i2c_client *client)
|
||||
{
|
||||
struct pmbus_driver_info *info;
|
||||
struct mp2856_data *data;
|
||||
int ret;
|
||||
|
||||
data = devm_kzalloc(&client->dev, sizeof(struct mp2856_data),
|
||||
GFP_KERNEL);
|
||||
if (!data)
|
||||
return -ENOMEM;
|
||||
|
||||
data->chip_id = (enum chips)(uintptr_t)i2c_get_match_data(client);
|
||||
|
||||
memcpy(data->max_phases, mp2856_max_phases[data->chip_id],
|
||||
sizeof(data->max_phases));
|
||||
|
||||
memcpy(&data->info, &mp2856_info, sizeof(*info));
|
||||
info = &data->info;
|
||||
|
||||
/* Identify multiphase configuration. */
|
||||
ret = mp2856_identify_multiphase_rail1(client, data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
if (mp2856_is_rail2_active(client)) {
|
||||
ret = mp2856_identify_multiphase_rail2(client, data);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
} else {
|
||||
/* rail2 is not active */
|
||||
info->pages = 1;
|
||||
}
|
||||
|
||||
/* Obtain current sense gain of power stage. */
|
||||
ret = mp2856_current_sense_gain_get(client, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* Identify vout format. */
|
||||
ret = mp2856_identify_vout_format(client, data);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
/* set the device to page 0 */
|
||||
i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0);
|
||||
|
||||
return pmbus_do_probe(client, info);
|
||||
}
|
||||
|
||||
static const struct of_device_id __maybe_unused mp2856_of_match[] = {
|
||||
{.compatible = "mps,mp2856", .data = (void *)mp2856},
|
||||
{.compatible = "mps,mp2857", .data = (void *)mp2857},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, mp2856_of_match);
|
||||
|
||||
static struct i2c_driver mp2856_driver = {
|
||||
.driver = {
|
||||
.name = "mp2856",
|
||||
.of_match_table = mp2856_of_match,
|
||||
},
|
||||
.probe = mp2856_probe,
|
||||
.id_table = mp2856_id,
|
||||
};
|
||||
|
||||
module_i2c_driver(mp2856_driver);
|
||||
|
||||
MODULE_AUTHOR("Peter Yin <peter.yin@quantatw.com>");
|
||||
MODULE_DESCRIPTION("PMBus driver for MPS MP2856/MP2857 device");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_IMPORT_NS(PMBUS);
|
||||
Loading…
Reference in New Issue
Block a user