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Mon, 3 May 2021 20:47:17 +0000 Received: from dev-r-vrt-156.mtr.labs.mlnx (172.20.145.6) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 3 May 2021 20:47:15 +0000 From: Vadim Pasternak To: , CC: , , "Vadim Pasternak" Subject: [PATCH hwmon-next v4 2/3] hwmon: (pmbus) Add support for MPS Multi-phase mp2888 controller Date: Mon, 3 May 2021 23:46:45 +0300 Message-ID: <20210503204646.2742486-3-vadimp@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210503204646.2742486-1-vadimp@nvidia.com> References: <20210503204646.2742486-1-vadimp@nvidia.com> MIME-Version: 1.0 X-Originating-IP: [172.20.145.6] X-ClientProxiedBy: HQMAIL101.nvidia.com (172.20.187.10) To HQMAIL107.nvidia.com (172.20.187.13) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5655e829-1d66-4cb5-0554-08d90e74a3dc X-MS-TrafficTypeDiagnostic: CH2PR12MB5019: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 May 2021 20:47:17.6407 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5655e829-1d66-4cb5-0554-08d90e74a3dc X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.34];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT011.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB5019 Precedence: bulk List-ID: X-Mailing-List: linux-hwmon@vger.kernel.org Add support for mp2888 device from Monolithic Power Systems, Inc. (MPS) vendor. This is a digital, multi-phase, pulse-width modulation controller. This device supports: - One power rail. - Programmable Multi-Phase up to 10 Phases. - PWM-VID Interface - One pages 0 for telemetry. - Programmable pins for PMBus Address. - Built-In EEPROM to Store Custom Configurations. - Can configured VOUT readout in direct or VID format and allows setting of different formats on rails 1 and 2. For VID the following protocols are available: VR13 mode with 5-mV DAC; VR13 mode with 10-mV DAC, IMVP9 mode with 5-mV DAC. Signed-off-by: Vadim Pasternak --- v3->v4 Comments pointed out by Guenter: - Fix PMBUS_READ_VIN and limits calculations. - Add comment for PMBUS_OT_WARN_LIMIT scaling. - Fix PMBUS_READ_IOUT, PMBUS_READ_POUT, PMBUS_READ_PIN calculations. - Enable PMBUS_IOUT_OC_WARN_LIMIT and PMBUS_POUT_OP_WARN_LIMIT. Fixes from Vadim: - Disable PMBUS_POUT_MAX. Device uses this register for different purpose. - Disable PMBUS_MFR_VOU_MIN. Device doe not implement this register. - Update documentation file. v2->v3 Comments pointed out by Guenter: - Fix precision for PMBUS_READ_VIN (it requires adding scale for PMBUS_VIN_OV_FAULT_LIMIT and PMBUS_VIN_UV_WARN_LIMIT. - Fix precision for PMBUS_READ_TEMPERATURE_1 (it requires adding scale for PMBUS_OT_WARN_LIMIT). - Use DIV_ROUND_CLOSEST_ULL for scaling PMBUS_READ_POUT, PMBUS_READ_PIN readouts. Notes and fixes from Vadim: - READ_IOUT in linear11 does not give write calculation (tested with external load), while in direct format readouts are correct. - Disable non-configured phases in mp2888_identify_multiphase(). v1->v2: Comments pointed out by Guenter: - Use standard access for getting PMBUS_OT_WARN_LIMIT, PMBUS_VIN_OV_FAULT_LIMIT, PMBUS_VIN_UV_WARN_LIMIT. - Use linear11 conversion for PMBUS_READ_VIN, PMBUS_READ_POUT, PMBUS_READ_PIN, PMBUS_READ_TEMPERATURE_1 and adjust coefficients. - Add reading phases current from the dedicated registers. - Add comment for not implemented or implemented not according to the spec registers, for which "ENXIO" code is returned. - Set PMBUS_HAVE_IOUT" statically. Notes from Vadim: - READ_IOUT uses direct format, so I did not adjust it like the below registers. --- Documentation/hwmon/mp2888.rst | 113 +++++++++++++ drivers/hwmon/pmbus/Kconfig | 9 + drivers/hwmon/pmbus/Makefile | 1 + drivers/hwmon/pmbus/mp2888.c | 366 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 489 insertions(+) create mode 100644 Documentation/hwmon/mp2888.rst create mode 100644 drivers/hwmon/pmbus/mp2888.c diff --git a/Documentation/hwmon/mp2888.rst b/Documentation/hwmon/mp2888.rst new file mode 100644 index 000000000000..5e578fd7b147 --- /dev/null +++ b/Documentation/hwmon/mp2888.rst @@ -0,0 +1,113 @@ +.. SPDX-License-Identifier: GPL-2.0 + +Kernel driver mp2888 +==================== + +Supported chips: + + * MPS MP12254 + + Prefix: 'mp2888' + +Author: + + Vadim Pasternak + +Description +----------- + +This driver implements support for Monolithic Power Systems, Inc. (MPS) +vendor dual-loop, digital, multi-phase controller MP2888. + +This device: supports: + +- One power rail. +- Programmable Multi-Phase up to 10 Phases. +- PWM-VID Interface +- One pages 0 for telemetry. +- Programmable pins for PMBus Address. +- Built-In EEPROM to Store Custom Configurations. + +Device complaint with: + +- PMBus rev 1.3 interface. + +Device supports direct format for reading output current, output voltage, +input and output power and temperature. +Device supports linear format for reading input voltage and input power. + +The driver provides the next attributes for the current: + +- for current out input and maximum alarm; +- for phase current: input and label. + +The driver exports the following attributes via the 'sysfs' files, where: + +- 'n' is number of configured phases (from 1 to 10); +- index 1 for "iout"; +- indexes 2 ... 1 + n for phases. + +**curr[1-{1+n}]_input** + +**curr[1-{1+n}]_label** + +**curr1_max** + +**curr1_max_alarm** + +The driver provides the next attributes for the voltage: + +- for voltage in: input, low and high critical thresholds, low and high + critical alarms; +- for voltage out: input and high alarm; + +The driver exports the following attributes via the 'sysfs' files, where + +**in1_crit** + +**in1_crit_alarm** + +**in1_input** + +**in1_label** + +**in1_min** + +**in1_min_alarm** + +**in2_alarm** + +**in2_input** + +**in2_label** + +The driver provides the next attributes for the power: + +- for power in alarm and input. +- for power out: cap, cap alarm an input. + +The driver exports the following attributes via the 'sysfs' files, where +- indexes 1 for "pin"; +- indexes 2 for "pout"; + +**power1_alarm** + +**power1_input** + +**power1_label** + +**power2_input** + +**power2_label** + +**power2_max** + +**power2_max_alarm** + +The driver provides the next attributes for the temperature: + +**temp1_input** + +**temp1_max** + +**temp1_max_alarm** diff --git a/drivers/hwmon/pmbus/Kconfig b/drivers/hwmon/pmbus/Kconfig index 32d2fc850621..a57571928b31 100644 --- a/drivers/hwmon/pmbus/Kconfig +++ b/drivers/hwmon/pmbus/Kconfig @@ -211,6 +211,15 @@ config SENSORS_MAX8688 This driver can also be built as a module. If so, the module will be called max8688. +config SENSORS_MP2888 + tristate "MPS MP2888" + help + If you say yes here you get hardware monitoring support for MPS + MP2888 Digital, Multi-Phase, Pulse-Width Modulation Controller. + + This driver can also be built as a module. If so, the module will + be called mp2888. + config SENSORS_MP2975 tristate "MPS MP2975" help diff --git a/drivers/hwmon/pmbus/Makefile b/drivers/hwmon/pmbus/Makefile index 6a4ba0fdc1db..a6d7352621ca 100644 --- a/drivers/hwmon/pmbus/Makefile +++ b/drivers/hwmon/pmbus/Makefile @@ -24,6 +24,7 @@ obj-$(CONFIG_SENSORS_MAX20751) += max20751.o obj-$(CONFIG_SENSORS_MAX31785) += max31785.o obj-$(CONFIG_SENSORS_MAX34440) += max34440.o obj-$(CONFIG_SENSORS_MAX8688) += max8688.o +obj-$(CONFIG_SENSORS_MP2888) += mp2888.o obj-$(CONFIG_SENSORS_MP2975) += mp2975.o obj-$(CONFIG_SENSORS_PM6764TR) += pm6764tr.o obj-$(CONFIG_SENSORS_PXE1610) += pxe1610.o diff --git a/drivers/hwmon/pmbus/mp2888.c b/drivers/hwmon/pmbus/mp2888.c new file mode 100644 index 000000000000..393221d25379 --- /dev/null +++ b/drivers/hwmon/pmbus/mp2888.c @@ -0,0 +1,366 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers + * + * Copyright (C) 2020 Nvidia Technologies Ltd. + */ + +#include +#include +#include +#include +#include +#include "pmbus.h" + +/* Vendor specific registers. */ +#define MP2888_MFR_SYS_CONFIG 0x44 +#define MP2888_MFR_READ_CS1_2 0x73 +#define MP2888_MFR_READ_CS3_4 0x74 +#define MP2888_MFR_READ_CS5_6 0x75 +#define MP2888_MFR_READ_CS7_8 0x76 +#define MP2888_MFR_READ_CS9_10 0x77 +#define MP2888_MFR_VR_CONFIG1 0xe1 + +#define MP2888_TOTAL_CURRENT_RESOLUTION BIT(3) +#define MP2888_PHASE_CURRENT_RESOLUTION BIT(4) +#define MP2888_DRMOS_KCS GENMASK(2, 0) +#define MP2888_TEMP_UNIT 10 +#define MP2888_MAX_PHASE 10 + +struct mp2888_data { + struct pmbus_driver_info info; + int total_curr_resolution; + int phase_curr_resolution; + int curr_sense_gain; +}; + +#define to_mp2888_data(x) container_of(x, struct mp2888_data, info) + +static int mp2888_read_byte_data(struct i2c_client *client, int page, int reg) +{ + switch (reg) { + case PMBUS_VOUT_MODE: + /* Enforce VOUT direct format. */ + return PB_VOUT_MODE_DIRECT; + default: + return -ENODATA; + } +} + +static int +mp2888_current_sense_gain_and_resolution_get(struct i2c_client *client, struct mp2888_data *data) +{ + int ret; + + /* + * Obtain DrMOS current sense gain of power stage from the register + * , bits 0-2. The value is selected as below: + * 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. Other + * values are reserved. + */ + ret = i2c_smbus_read_word_data(client, MP2888_MFR_SYS_CONFIG); + if (ret < 0) + return ret; + + switch (ret & MP2888_DRMOS_KCS) { + case 0: + data->curr_sense_gain = 85; + break; + case 1: + data->curr_sense_gain = 97; + break; + case 2: + data->curr_sense_gain = 100; + break; + case 3: + data->curr_sense_gain = 50; + break; + default: + return -EINVAL; + } + + /* + * Obtain resolution selector for total and phase current report and protection. + * 0: original resolution; 1: half resolution (in such case phase current value should + * be doubled. + */ + data->total_curr_resolution = (ret & MP2888_TOTAL_CURRENT_RESOLUTION) >> 3; + data->phase_curr_resolution = (ret & MP2888_PHASE_CURRENT_RESOLUTION) >> 4; + + return 0; +} + +static int +mp2888_read_phase(struct i2c_client *client, struct mp2888_data *data, int page, int phase, u8 reg) +{ + int ret; + + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + + if (!((phase + 1) % 2)) + ret >>= 8; + ret &= 0xff; + + /* + * Output value is calculated as: (READ_CSx / 80 – 1.23) / (Kcs * Rcs) + * where: + * - Kcs is the DrMOS current sense gain of power stage, which is obtained from the + * register MP2888_MFR_VR_CONFIG1, bits 13-12 with the following selection of DrMOS + * (data->curr_sense_gain): + * 00b - 5µA/A, 01b - 8.5µA/A, 10b - 9.7µA/A, 11b - 10µA/A. + * - Rcs is the internal phase current sense resistor. This parameter depends on hardware + * assembly. By default it is set to 1kΩ. In case of different assembly, user should + * scale this parameter by dividing it by Rcs. + * If phase current resolution bit is set to 1, READ_CSx value should be doubled. + * Note, that current phase sensing, providing by the device is not accurate. This is + * because sampling of current occurrence of bit weight has a big deviation, especially for + * light load. + */ + ret = DIV_ROUND_CLOSEST(ret * 100 - 9800, data->curr_sense_gain); + if (data->phase_curr_resolution) + ret *= 2; + /* Scale according to total current resolution. */ + if (data->total_curr_resolution) + ret *= 2; + else + ret *= 4; + return ret; +} + +static int +mp2888_read_phases(struct i2c_client *client, struct mp2888_data *data, int page, int phase) +{ + int ret; + + switch (phase) { + case 0 ... 1: + ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS1_2); + break; + case 2 ... 3: + ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS3_4); + break; + case 4 ... 5: + ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS5_6); + break; + case 6 ... 7: + ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS7_8); + break; + case 8 ... 9: + ret = mp2888_read_phase(client, data, page, phase, MP2888_MFR_READ_CS9_10); + break; + default: + return -ENODATA; + } + return ret; +} + +static int mp2888_read_word_data(struct i2c_client *client, int page, int phase, int reg) +{ + const struct pmbus_driver_info *info = pmbus_get_driver_info(client); + struct mp2888_data *data = to_mp2888_data(info); + int ret; + + switch (reg) { + case PMBUS_READ_VIN: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret <= 0) + return ret; + + /* + * READ_VIN requires fixup to scale it to linear11 format. Register data format + * provides 10 bits for mantissa and 6 bits for exponent. Bits 15:10 are set with + * the fixed value 111011b. + */ + ret = ((ret & 0x3ff) >> 1) | (ret & ~GENMASK(11, 0)); + break; + case PMBUS_OT_WARN_LIMIT: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + /* + * Chip reports limits in degrees C, but the actual temperature in 10th of + * degrees C - scaling is needed to match both. + */ + ret *= MP2888_TEMP_UNIT; + break; + case PMBUS_READ_IOUT: + case PMBUS_IOUT_OC_WARN_LIMIT: + if (phase != 0xff) + return mp2888_read_phases(client, data, page, phase); + + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + /* + * READ_IOUT register has unused bits 15:12 with fixed value 1110b. Clear these + * bits and scale with total current resolution. Data is provided in direct format. + */ + ret &= GENMASK(11, 0); + break; + case PMBUS_READ_POUT: + case PMBUS_READ_PIN: + case PMBUS_POUT_OP_WARN_LIMIT: + ret = pmbus_read_word_data(client, page, phase, reg); + if (ret < 0) + return ret; + ret = data->total_curr_resolution ? ret * 2 : ret; + break; + /* + * The below registers are not implemented by device or implemented not according to the + * spec. Skip all of them to avoid exposing non-relevant inputs to sysfs. + */ + case PMBUS_OT_FAULT_LIMIT: + case PMBUS_UT_WARN_LIMIT: + case PMBUS_UT_FAULT_LIMIT: + case PMBUS_VIN_UV_FAULT_LIMIT: + case PMBUS_VOUT_UV_WARN_LIMIT: + case PMBUS_VOUT_OV_WARN_LIMIT: + case PMBUS_VOUT_UV_FAULT_LIMIT: + case PMBUS_VOUT_OV_FAULT_LIMIT: + case PMBUS_VIN_OV_WARN_LIMIT: + case PMBUS_IOUT_OC_LV_FAULT_LIMIT: + case PMBUS_IOUT_OC_FAULT_LIMIT: + case PMBUS_POUT_MAX: + case PMBUS_IOUT_UC_FAULT_LIMIT: + case PMBUS_POUT_OP_FAULT_LIMIT: + case PMBUS_PIN_OP_WARN_LIMIT: + case PMBUS_MFR_VIN_MIN: + case PMBUS_MFR_VOUT_MIN: + case PMBUS_MFR_VIN_MAX: + case PMBUS_MFR_VOUT_MAX: + case PMBUS_MFR_IIN_MAX: + case PMBUS_MFR_IOUT_MAX: + case PMBUS_MFR_PIN_MAX: + case PMBUS_MFR_POUT_MAX: + case PMBUS_MFR_MAX_TEMP_1: + return -ENXIO; + default: + return -ENODATA; + } + + return ret; +} + +static int +mp2888_identify_multiphase(struct i2c_client *client, struct mp2888_data *data, + struct pmbus_driver_info *info) +{ + int i, ret; + + ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, 0); + if (ret < 0) + return ret; + + /* Identify multiphase number - could be from 1 to 10. */ + ret = i2c_smbus_read_word_data(client, MP2888_MFR_VR_CONFIG1); + if (ret <= 0) + return ret; + + info->phases[0] = ret & GENMASK(3, 0); + + /* + * The device provides a total of 10 PWM pins, and can be configured to different phase + * count applications for rail. + */ + if (info->phases[0] > MP2888_MAX_PHASE) + return -EINVAL; + + /* Disable non-configured phases. */ + for (i = info->phases[0]; i < MP2888_MAX_PHASE; i++) + info->pfunc[i] = 0; + + return 0; +} + +static struct pmbus_driver_info mp2888_info = { + .pages = 1, + .format[PSC_VOLTAGE_IN] = linear, + .format[PSC_VOLTAGE_OUT] = direct, + .format[PSC_TEMPERATURE] = direct, + .format[PSC_CURRENT_IN] = linear, + .format[PSC_CURRENT_OUT] = direct, + .format[PSC_POWER] = direct, + .m[PSC_TEMPERATURE] = 1, + .R[PSC_TEMPERATURE] = 1, + .m[PSC_VOLTAGE_OUT] = 1, + .R[PSC_VOLTAGE_OUT] = 3, + .m[PSC_CURRENT_OUT] = 4, + .m[PSC_POWER] = 1, + .func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_IOUT | + PMBUS_HAVE_STATUS_IOUT | PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP | + PMBUS_HAVE_POUT | PMBUS_HAVE_PIN | PMBUS_HAVE_STATUS_INPUT | + PMBUS_PHASE_VIRTUAL, + .pfunc[0] = PMBUS_HAVE_IOUT, + .pfunc[1] = PMBUS_HAVE_IOUT, + .pfunc[2] = PMBUS_HAVE_IOUT, + .pfunc[3] = PMBUS_HAVE_IOUT, + .pfunc[4] = PMBUS_HAVE_IOUT, + .pfunc[5] = PMBUS_HAVE_IOUT, + .pfunc[6] = PMBUS_HAVE_IOUT, + .pfunc[7] = PMBUS_HAVE_IOUT, + .pfunc[8] = PMBUS_HAVE_IOUT, + .pfunc[9] = PMBUS_HAVE_IOUT, + .read_byte_data = mp2888_read_byte_data, + .read_word_data = mp2888_read_word_data, +}; + +static int mp2888_probe(struct i2c_client *client) +{ + struct pmbus_driver_info *info; + struct mp2888_data *data; + int ret; + + data = devm_kzalloc(&client->dev, sizeof(struct mp2888_data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + memcpy(&data->info, &mp2888_info, sizeof(*info)); + info = &data->info; + + /* Identify multiphase configuration. */ + ret = mp2888_identify_multiphase(client, data, info); + if (ret) + return ret; + + /* Obtain current sense gain of power stage and current resolution. */ + ret = mp2888_current_sense_gain_and_resolution_get(client, data); + if (ret) + return ret; + + if (data->total_curr_resolution) { + info->m[PSC_POWER] *= 2; + info->m[PSC_CURRENT_OUT] /= 2; + } + + return pmbus_do_probe(client, info); +} + +static const struct i2c_device_id mp2888_id[] = { + {"mp2888", 0}, + {} +}; + +MODULE_DEVICE_TABLE(i2c, mp2888_id); + +static const struct of_device_id __maybe_unused mp2888_of_match[] = { + {.compatible = "mps,mp2888"}, + {} +}; +MODULE_DEVICE_TABLE(of, mp2888_of_match); + +static struct i2c_driver mp2888_driver = { + .driver = { + .name = "mp2888", + .of_match_table = of_match_ptr(mp2888_of_match), + }, + .probe_new = mp2888_probe, + .id_table = mp2888_id, +}; + +module_i2c_driver(mp2888_driver); + +MODULE_AUTHOR("Vadim Pasternak "); +MODULE_DESCRIPTION("PMBus driver for MPS MP2888 device"); +MODULE_LICENSE("GPL");