// SPDX-License-Identifier: GPL-2.0-or-later /* * Hardware monitoring driver for MPS Multi-phase Digital VR Controllers(MP2925) */ #include #include #include #include #include "pmbus.h" /* * Vender specific register MFR_VR_MULTI_CONFIG(0x08). * This register is used to obtain vid scale. */ #define MFR_VR_MULTI_CONFIG 0x08 #define MP2925_VOUT_DIV 512 #define MP2925_VOUT_OVUV_UINT 195 #define MP2925_VOUT_OVUV_DIV 100 #define MP2925_PAGE_NUM 2 #define MP2925_RAIL1_FUNC (PMBUS_HAVE_VIN | PMBUS_HAVE_PIN | \ PMBUS_HAVE_VOUT | PMBUS_HAVE_IOUT | \ PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP | \ PMBUS_HAVE_STATUS_VOUT | \ PMBUS_HAVE_STATUS_IOUT | \ PMBUS_HAVE_STATUS_TEMP | \ PMBUS_HAVE_STATUS_INPUT) #define MP2925_RAIL2_FUNC (PMBUS_HAVE_PIN | PMBUS_HAVE_VOUT | \ PMBUS_HAVE_IOUT | PMBUS_HAVE_POUT | \ PMBUS_HAVE_TEMP | PMBUS_HAVE_IIN | \ PMBUS_HAVE_STATUS_VOUT | \ PMBUS_HAVE_STATUS_IOUT | \ PMBUS_HAVE_STATUS_TEMP | \ PMBUS_HAVE_STATUS_INPUT) struct mp2925_data { struct pmbus_driver_info info; int vout_scale[MP2925_PAGE_NUM]; }; #define to_mp2925_data(x) container_of(x, struct mp2925_data, info) static u16 mp2925_linear_exp_transfer(u16 word, u16 expect_exponent) { s16 exponent, mantissa, target_exponent; exponent = ((s16)word) >> 11; mantissa = ((s16)((word & 0x7ff) << 5)) >> 5; target_exponent = (s16)((expect_exponent & 0x1f) << 11) >> 11; if (exponent > target_exponent) mantissa = mantissa << (exponent - target_exponent); else mantissa = mantissa >> (target_exponent - exponent); return (mantissa & 0x7ff) | ((expect_exponent << 11) & 0xf800); } static int mp2925_read_byte_data(struct i2c_client *client, int page, int reg) { int ret; switch (reg) { case PMBUS_VOUT_MODE: /* * The MP2925 does not follow standard PMBus protocol completely, * and the calculation of vout in this driver is based on direct * format. As a result, the format of vout is enforced to direct. */ ret = PB_VOUT_MODE_DIRECT; break; default: ret = -ENODATA; break; } return ret; } static int mp2925_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 mp2925_data *data = to_mp2925_data(info); int ret; switch (reg) { case PMBUS_READ_VOUT: ret = pmbus_read_word_data(client, page, phase, reg); if (ret < 0) return ret; ret = DIV_ROUND_CLOSEST((ret & GENMASK(11, 0)) * data->vout_scale[page], MP2925_VOUT_DIV); break; case PMBUS_VOUT_OV_FAULT_LIMIT: case PMBUS_VOUT_UV_FAULT_LIMIT: ret = pmbus_read_word_data(client, page, phase, reg); if (ret < 0) return ret; ret = DIV_ROUND_CLOSEST((ret & GENMASK(11, 0)) * MP2925_VOUT_OVUV_UINT, MP2925_VOUT_OVUV_DIV); break; case PMBUS_STATUS_WORD: case PMBUS_READ_VIN: case PMBUS_READ_IOUT: case PMBUS_READ_POUT: case PMBUS_READ_PIN: case PMBUS_READ_IIN: case PMBUS_READ_TEMPERATURE_1: case PMBUS_VIN_OV_FAULT_LIMIT: case PMBUS_VIN_OV_WARN_LIMIT: case PMBUS_VIN_UV_WARN_LIMIT: case PMBUS_VIN_UV_FAULT_LIMIT: case PMBUS_IOUT_OC_FAULT_LIMIT: case PMBUS_IOUT_OC_WARN_LIMIT: case PMBUS_OT_FAULT_LIMIT: case PMBUS_OT_WARN_LIMIT: ret = -ENODATA; break; default: ret = -EINVAL; break; } return ret; } static int mp2925_write_word_data(struct i2c_client *client, int page, int reg, u16 word) { int ret; switch (reg) { case PMBUS_VIN_OV_FAULT_LIMIT: case PMBUS_VIN_OV_WARN_LIMIT: case PMBUS_VIN_UV_WARN_LIMIT: case PMBUS_VIN_UV_FAULT_LIMIT: /* * The PMBUS_VIN_OV_FAULT_LIMIT, PMBUS_VIN_OV_WARN_LIMIT, * PMBUS_VIN_UV_WARN_LIMIT and PMBUS_VIN_UV_FAULT_LIMIT * of MP2925 is linear11 format, and the exponent is a * constant value(5'b11100)， so the exponent of word * parameter should be converted to 5'b11100(0x1C). */ ret = pmbus_write_word_data(client, page, reg, mp2925_linear_exp_transfer(word, 0x1C)); break; case PMBUS_VOUT_OV_FAULT_LIMIT: case PMBUS_VOUT_UV_FAULT_LIMIT: /* * The bit0-bit11 is the limit value, and bit12-bit15 * should not be changed. */ ret = pmbus_read_word_data(client, page, 0xff, reg); if (ret < 0) return ret; ret = pmbus_write_word_data(client, page, reg, (ret & ~GENMASK(11, 0)) | FIELD_PREP(GENMASK(11, 0), DIV_ROUND_CLOSEST(word * MP2925_VOUT_OVUV_DIV, MP2925_VOUT_OVUV_UINT))); break; case PMBUS_OT_FAULT_LIMIT: case PMBUS_OT_WARN_LIMIT: /* * The PMBUS_OT_FAULT_LIMIT and PMBUS_OT_WARN_LIMIT of * MP2925 is linear11 format, and the exponent is a * constant value(5'b00000), so the exponent of word * parameter should be converted to 5'b00000. */ ret = pmbus_write_word_data(client, page, reg, mp2925_linear_exp_transfer(word, 0x00)); break; case PMBUS_IOUT_OC_FAULT_LIMIT: case PMBUS_IOUT_OC_WARN_LIMIT: /* * The PMBUS_IOUT_OC_FAULT_LIMIT and PMBUS_IOUT_OC_WARN_LIMIT * of MP2925 is linear11 format, and the exponent can not be * changed. */ ret = pmbus_read_word_data(client, page, 0xff, reg); if (ret < 0) return ret; ret = pmbus_write_word_data(client, page, reg, mp2925_linear_exp_transfer(word, FIELD_GET(GENMASK(15, 11), ret))); break; default: ret = -EINVAL; break; } return ret; } static int mp2925_identify_vout_scale(struct i2c_client *client, struct pmbus_driver_info *info, int page) { struct mp2925_data *data = to_mp2925_data(info); int ret; ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page); if (ret < 0) return ret; ret = i2c_smbus_read_byte_data(client, PMBUS_VOUT_MODE); if (ret < 0) return ret; if (FIELD_GET(GENMASK(5, 5), ret)) { ret = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page == 0 ? 3 : 4); if (ret < 0) return ret; ret = i2c_smbus_read_word_data(client, MFR_VR_MULTI_CONFIG); if (ret < 0) return ret; if (FIELD_GET(GENMASK(5, 5), ret)) data->vout_scale[page] = 2560; else data->vout_scale[page] = 5120; } else if (FIELD_GET(GENMASK(4, 4), ret)) { data->vout_scale[page] = 1; } else { data->vout_scale[page] = 512; } return 0; } static int mp2925_identify(struct i2c_client *client, struct pmbus_driver_info *info) { int ret; ret = mp2925_identify_vout_scale(client, info, 0); if (ret < 0) return ret; return mp2925_identify_vout_scale(client, info, 1); } static const struct pmbus_driver_info mp2925_info = { .pages = MP2925_PAGE_NUM, .format[PSC_VOLTAGE_IN] = linear, .format[PSC_CURRENT_IN] = linear, .format[PSC_CURRENT_OUT] = linear, .format[PSC_POWER] = linear, .format[PSC_TEMPERATURE] = linear, .format[PSC_VOLTAGE_OUT] = direct, .m[PSC_VOLTAGE_OUT] = 1, .R[PSC_VOLTAGE_OUT] = 3, .b[PSC_VOLTAGE_OUT] = 0, .func[0] = MP2925_RAIL1_FUNC, .func[1] = MP2925_RAIL2_FUNC, .read_word_data = mp2925_read_word_data, .read_byte_data = mp2925_read_byte_data, .write_word_data = mp2925_write_word_data, .identify = mp2925_identify, }; static int mp2925_probe(struct i2c_client *client) { struct mp2925_data *data; data = devm_kzalloc(&client->dev, sizeof(struct mp2925_data), GFP_KERNEL); if (!data) return -ENOMEM; memcpy(&data->info, &mp2925_info, sizeof(mp2925_info)); return pmbus_do_probe(client, &data->info); } static const struct i2c_device_id mp2925_id[] = { {"mp2925"}, {"mp2929"}, {} }; MODULE_DEVICE_TABLE(i2c, mp2925_id); static const struct of_device_id __maybe_unused mp2925_of_match[] = { {.compatible = "mps,mp2925"}, {.compatible = "mps,mp2929"}, {} }; MODULE_DEVICE_TABLE(of, mp2925_of_match); static struct i2c_driver mp2925_driver = { .driver = { .name = "mp2925", .of_match_table = mp2925_of_match, }, .probe = mp2925_probe, .id_table = mp2925_id, }; module_i2c_driver(mp2925_driver); MODULE_AUTHOR("Wensheng Wang "); MODULE_DESCRIPTION("PMBus driver for MPS MP2925"); MODULE_LICENSE("GPL"); MODULE_IMPORT_NS("PMBUS");