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184 lines
4.8 KiB
184 lines
4.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* MEN 14F021P00 Board Management Controller (BMC) Watchdog Driver. |
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* |
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* Copyright (C) 2014 MEN Mikro Elektronik Nuernberg GmbH |
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*/ |
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#include <linux/kernel.h> |
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#include <linux/device.h> |
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#include <linux/module.h> |
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#include <linux/watchdog.h> |
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#include <linux/platform_device.h> |
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#include <linux/i2c.h> |
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#define DEVNAME "menf21bmc_wdt" |
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#define BMC_CMD_WD_ON 0x11 |
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#define BMC_CMD_WD_OFF 0x12 |
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#define BMC_CMD_WD_TRIG 0x13 |
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#define BMC_CMD_WD_TIME 0x14 |
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#define BMC_CMD_WD_STATE 0x17 |
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#define BMC_WD_OFF_VAL 0x69 |
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#define BMC_CMD_RST_RSN 0x92 |
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#define BMC_WD_TIMEOUT_MIN 1 /* in sec */ |
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#define BMC_WD_TIMEOUT_MAX 6553 /* in sec */ |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0); |
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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struct menf21bmc_wdt { |
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struct watchdog_device wdt; |
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struct i2c_client *i2c_client; |
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}; |
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static int menf21bmc_wdt_set_bootstatus(struct menf21bmc_wdt *data) |
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{ |
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int rst_rsn; |
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rst_rsn = i2c_smbus_read_byte_data(data->i2c_client, BMC_CMD_RST_RSN); |
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if (rst_rsn < 0) |
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return rst_rsn; |
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if (rst_rsn == 0x02) |
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data->wdt.bootstatus |= WDIOF_CARDRESET; |
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else if (rst_rsn == 0x05) |
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data->wdt.bootstatus |= WDIOF_EXTERN1; |
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else if (rst_rsn == 0x06) |
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data->wdt.bootstatus |= WDIOF_EXTERN2; |
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else if (rst_rsn == 0x0A) |
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data->wdt.bootstatus |= WDIOF_POWERUNDER; |
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return 0; |
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} |
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static int menf21bmc_wdt_start(struct watchdog_device *wdt) |
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{ |
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struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); |
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return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_ON); |
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} |
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static int menf21bmc_wdt_stop(struct watchdog_device *wdt) |
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{ |
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struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); |
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return i2c_smbus_write_byte_data(drv_data->i2c_client, |
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BMC_CMD_WD_OFF, BMC_WD_OFF_VAL); |
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} |
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static int |
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menf21bmc_wdt_settimeout(struct watchdog_device *wdt, unsigned int timeout) |
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{ |
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int ret; |
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struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); |
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/* |
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* BMC Watchdog does have a resolution of 100ms. |
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* Watchdog API defines the timeout in seconds, so we have to |
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* multiply the value. |
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*/ |
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ret = i2c_smbus_write_word_data(drv_data->i2c_client, |
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BMC_CMD_WD_TIME, timeout * 10); |
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if (ret < 0) |
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return ret; |
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wdt->timeout = timeout; |
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return 0; |
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} |
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static int menf21bmc_wdt_ping(struct watchdog_device *wdt) |
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{ |
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struct menf21bmc_wdt *drv_data = watchdog_get_drvdata(wdt); |
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return i2c_smbus_write_byte(drv_data->i2c_client, BMC_CMD_WD_TRIG); |
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} |
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static const struct watchdog_info menf21bmc_wdt_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, |
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.identity = DEVNAME, |
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}; |
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static const struct watchdog_ops menf21bmc_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = menf21bmc_wdt_start, |
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.stop = menf21bmc_wdt_stop, |
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.ping = menf21bmc_wdt_ping, |
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.set_timeout = menf21bmc_wdt_settimeout, |
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}; |
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static int menf21bmc_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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int ret, bmc_timeout; |
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struct menf21bmc_wdt *drv_data; |
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struct i2c_client *i2c_client = to_i2c_client(dev->parent); |
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drv_data = devm_kzalloc(dev, sizeof(struct menf21bmc_wdt), GFP_KERNEL); |
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if (!drv_data) |
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return -ENOMEM; |
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drv_data->wdt.ops = &menf21bmc_wdt_ops; |
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drv_data->wdt.info = &menf21bmc_wdt_info; |
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drv_data->wdt.min_timeout = BMC_WD_TIMEOUT_MIN; |
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drv_data->wdt.max_timeout = BMC_WD_TIMEOUT_MAX; |
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drv_data->wdt.parent = dev; |
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drv_data->i2c_client = i2c_client; |
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/* |
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* Get the current wdt timeout value from the BMC because |
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* the BMC will save the value set before if the system restarts. |
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*/ |
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bmc_timeout = i2c_smbus_read_word_data(drv_data->i2c_client, |
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BMC_CMD_WD_TIME); |
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if (bmc_timeout < 0) { |
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dev_err(dev, "failed to get current WDT timeout\n"); |
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return bmc_timeout; |
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} |
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watchdog_init_timeout(&drv_data->wdt, bmc_timeout / 10, dev); |
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watchdog_set_nowayout(&drv_data->wdt, nowayout); |
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watchdog_set_drvdata(&drv_data->wdt, drv_data); |
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platform_set_drvdata(pdev, drv_data); |
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ret = menf21bmc_wdt_set_bootstatus(drv_data); |
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if (ret < 0) { |
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dev_err(dev, "failed to set Watchdog bootstatus\n"); |
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return ret; |
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} |
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ret = devm_watchdog_register_device(dev, &drv_data->wdt); |
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if (ret) |
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return ret; |
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dev_info(dev, "MEN 14F021P00 BMC Watchdog device enabled\n"); |
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return 0; |
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} |
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static void menf21bmc_wdt_shutdown(struct platform_device *pdev) |
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{ |
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struct menf21bmc_wdt *drv_data = platform_get_drvdata(pdev); |
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i2c_smbus_write_word_data(drv_data->i2c_client, |
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BMC_CMD_WD_OFF, BMC_WD_OFF_VAL); |
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} |
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static struct platform_driver menf21bmc_wdt = { |
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.driver = { |
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.name = DEVNAME, |
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}, |
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.probe = menf21bmc_wdt_probe, |
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.shutdown = menf21bmc_wdt_shutdown, |
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}; |
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module_platform_driver(menf21bmc_wdt); |
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MODULE_DESCRIPTION("MEN 14F021P00 BMC Watchdog driver"); |
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MODULE_AUTHOR("Andreas Werner <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:menf21bmc_wdt");
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