The MEN 14F021P00 Board Management Controller provides an I2C interface to the host to access the feature implemented in the BMC. The BMC is a PIC Microntroller assembled on CPCI Card from MEN Mikroelektronik and on a few Box/Display Computer. Added MFD Core driver, supporting the I2C communication to the device. The MFD driver currently supports the following features: - Watchdog - LEDs Signed-off-by: Andreas Werner <andreas.werner@xxxxxx> --- drivers/mfd/Kconfig | 12 +++ drivers/mfd/Makefile | 1 + drivers/mfd/menf21bmc.c | 220 ++++++++++++++++++++++++++++++++++++++++++ include/linux/mfd/menf21bmc.h | 31 ++++++ 4 files changed, 264 insertions(+) create mode 100644 drivers/mfd/menf21bmc.c create mode 100644 include/linux/mfd/menf21bmc.h diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index ab5a43c..7c2e8d2 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -427,6 +427,18 @@ config MFD_MAX8998 additional drivers must be enabled in order to use the functionality of the device. +config MFD_MENF21BMC + tristate "MEN 14F021P00 Board Management Controller Support" + depends on I2C=y + select MFD_CORE + help + Say yes here to add support for the MEN 14F021P00 BMC + which is a Board Management Controller connected to the I2C bus. + This driver provides common support for accessing the devices; + additional drivers must be enabled in order to use the + functionality of the BMC device. + + config EZX_PCAP bool "Motorola EZXPCAP Support" depends on SPI_MASTER diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 5913208..8f2be38 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -167,3 +167,4 @@ obj-$(CONFIG_MFD_AS3711) += as3711.o obj-$(CONFIG_MFD_AS3722) += as3722.o obj-$(CONFIG_MFD_STW481X) += stw481x.o obj-$(CONFIG_MFD_IPAQ_MICRO) += ipaq-micro.o +obj-$(CONFIG_MFD_MENF21BMC) += menf21bmc.o diff --git a/drivers/mfd/menf21bmc.c b/drivers/mfd/menf21bmc.c new file mode 100644 index 0000000..8de92b5 --- /dev/null +++ b/drivers/mfd/menf21bmc.c @@ -0,0 +1,220 @@ +/* + * MEN 14F021P00 Board Management Controller (BMC) MFD Core Driver. + * + * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH + * Author: Andreas Werner <andreas.werner@xxxxxx> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/mfd/core.h> +#include <linux/mfd/menf21bmc.h> + +#define BMC_CMD_REV_MAJOR 0x80 +#define BMC_CMD_REV_MINOR 0x81 +#define BMC_CMD_REV_MAIN 0x82 +#define BMC_CMD_REV_BUILD 0x83 +#define BMC_CMD_REV_VERI 0x84 +#define BMC_CMD_WD_ARM_SET 0x18 +#define BMC_CMD_WD_ARM_GET 0x19 + +static struct mfd_cell menf21bmc_cell[] = { + { + .name = "menf21bmc_wd", + }, + { + .name = "menf21bmc_led", + }, +}; + +static int +menf21bmc_read_byte_data(struct i2c_client *client, u8 reg) +{ + int ret; + struct menf21bmc *data = i2c_get_clientdata(client); + + mutex_lock(&data->lock); + ret = i2c_smbus_read_byte_data(client, reg); + mutex_unlock(&data->lock); + + return ret; +} + +static int +menf21bmc_read_word_data(struct i2c_client *client, u8 reg) +{ + int ret; + struct menf21bmc *data = i2c_get_clientdata(client); + + mutex_lock(&data->lock); + ret = i2c_smbus_read_word_data(client, reg); + mutex_unlock(&data->lock); + + return ret; +} + +static int menf21bmc_write_byte_data(struct i2c_client *client, u8 reg, u8 val) +{ + int ret; + struct menf21bmc *data = i2c_get_clientdata(client); + + mutex_lock(&data->lock); + ret = i2c_smbus_write_byte_data(client, reg, val); + mutex_unlock(&data->lock); + + return ret; +} + +static int menf21bmc_write_word_data(struct i2c_client *client, u8 reg, u16 val) +{ + int ret; + struct menf21bmc *data = i2c_get_clientdata(client); + + mutex_lock(&data->lock); + ret = i2c_smbus_write_word_data(client, reg, val); + mutex_unlock(&data->lock); + + return ret; +} + +static int menf21bmc_write_byte(struct i2c_client *client, u8 val) +{ + int ret; + struct menf21bmc *data = i2c_get_clientdata(client); + + mutex_lock(&data->lock); + ret = i2c_smbus_write_byte(client, val); + mutex_unlock(&data->lock); + + return ret; +} + +static int menf21bmc_wd_leave_prod_mode(struct i2c_client *client) +{ + int val, ret; + + val = menf21bmc_read_byte_data(client, BMC_CMD_WD_ARM_GET); + if (val < 0) + return val; + + /* + * Production mode should be not active after delivery of the Board. + * To be sure we check it, inform the user and leave the mode + * if active. + */ + if (val == 0x00) { + dev_info(&client->dev, + "BMC in production mode. Leave production mode\n"); + + ret = menf21bmc_write_byte(client, BMC_CMD_WD_ARM_SET); + if (ret < 0) + return ret; + } + + return 0; +} + +static int +menf21bmc_probe(struct i2c_client *client, const struct i2c_device_id *ids) +{ + int ret; + struct menf21bmc *data; + int rev_major, rev_minor, rev_main; + + if (!i2c_check_functionality(client->adapter, + I2C_FUNC_SMBUS_BYTE_DATA | + I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BYTE)) + return -EIO; + + data = devm_kzalloc(&client->dev, sizeof(struct menf21bmc), GFP_KERNEL); + if (data == NULL) + return -ENOMEM; + + mutex_init(&data->lock); + + i2c_set_clientdata(client, data); + data->client = client; + data->read_word_data = menf21bmc_read_word_data; + data->read_byte_data = menf21bmc_read_byte_data; + data->write_word_data = menf21bmc_write_word_data; + data->write_byte_data = menf21bmc_write_byte_data; + data->write_byte = menf21bmc_write_byte; + + rev_major = menf21bmc_read_word_data(client, BMC_CMD_REV_MAJOR); + if (rev_major < 0) { + dev_err(&client->dev, "failed to get BMC major revision\n"); + return rev_major; + } + + rev_minor = menf21bmc_read_word_data(client, BMC_CMD_REV_MINOR); + if (rev_minor < 0) { + dev_err(&client->dev, "failed to get BMC minor revision\n"); + return rev_minor; + } + + rev_main = menf21bmc_read_word_data(client, BMC_CMD_REV_MAIN); + if (rev_main < 0) { + dev_err(&client->dev, "failed to get BMC main revision\n"); + return rev_main; + } + + dev_info(&client->dev, "FW Revision: %02d.%02d.%02d\n", + rev_major, rev_minor, rev_main); + + /* + * We have to leave the Production Mode of the BMC to activate the + * Watchdog functionality and the BIOS life sign monitoring. + */ + ret = menf21bmc_wd_leave_prod_mode(client); + if (ret < 0) { + dev_err(&client->dev, "failed to leave production mode\n"); + return ret; + } + + ret = mfd_add_devices(&client->dev, 0, menf21bmc_cell, + ARRAY_SIZE(menf21bmc_cell), NULL, 0, NULL); + if (ret < 0) { + dev_err(&client->dev, "mfd_add_devices failed\n"); + return ret; + } + + return 0; +} + +static int menf21bmc_remove(struct i2c_client *client) +{ + mfd_remove_devices(&client->dev); + return 0; +} + +static const struct i2c_device_id menf21bmc_id_table[] = { + {"menf21bmc", 0}, + { } +}; +MODULE_DEVICE_TABLE(i2c, menf21bmc_id_table); + +static struct i2c_driver menf21bmc_driver = { + .driver = { + .name = "menf21bmc", + .owner = THIS_MODULE, + }, + .id_table = menf21bmc_id_table, + .probe = menf21bmc_probe, + .remove = menf21bmc_remove, +}; + +module_i2c_driver(menf21bmc_driver); + +MODULE_DESCRIPTION("MEN 14F021P00 BMC mfd core driver"); +MODULE_AUTHOR("Andreas Werner <andreas.werner@xxxxxx"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/mfd/menf21bmc.h b/include/linux/mfd/menf21bmc.h new file mode 100644 index 0000000..1fc9b5c --- /dev/null +++ b/include/linux/mfd/menf21bmc.h @@ -0,0 +1,31 @@ +/* + * MEN 14F021P00 Board Management Controller (BMC) + * + * Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH + * Author: Andreas Werner <andreas.werner@xxxxxx> + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + */ + +#ifndef MENF21BMC_H +#define MENF21BMC_H + +struct menf21bmc { + struct i2c_client *client; + struct mutex lock; + + int (*read_word_data)(struct i2c_client *client, u8 reg); + int (*read_byte_data)(struct i2c_client *client, u8 reg); + int (*write_word_data)(struct i2c_client *client, u8 reg, u16 val); + int (*write_byte_data)(struct i2c_client *client, u8 reg, u8 val); + int (*write_byte)(struct i2c_client *client, u8 val); +}; + +#endif /* MENF21BMC_H */ + + -- 1.9.3 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html