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169 lines
4.0 KiB
169 lines
4.0 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* System monitoring driver for DA9055 PMICs. |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: David Dajun Chen <[email protected]> |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/slab.h> |
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#include <linux/platform_device.h> |
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#include <linux/watchdog.h> |
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#include <linux/delay.h> |
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#include <linux/mfd/da9055/core.h> |
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#include <linux/mfd/da9055/reg.h> |
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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, |
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"Watchdog cannot be stopped once started (default=" |
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); |
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#define DA9055_DEF_TIMEOUT 4 |
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#define DA9055_TWDMIN 256 |
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struct da9055_wdt_data { |
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struct watchdog_device wdt; |
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struct da9055 *da9055; |
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}; |
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static const struct { |
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u8 reg_val; |
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int user_time; /* In seconds */ |
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} da9055_wdt_maps[] = { |
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{ 0, 0 }, |
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{ 1, 2 }, |
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{ 2, 4 }, |
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{ 3, 8 }, |
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{ 4, 16 }, |
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{ 5, 32 }, |
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{ 5, 33 }, /* Actual time 32.768s so included both 32s and 33s */ |
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{ 6, 65 }, |
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{ 6, 66 }, /* Actual time 65.536s so include both, 65s and 66s */ |
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{ 7, 131 }, |
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}; |
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static int da9055_wdt_set_timeout(struct watchdog_device *wdt_dev, |
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unsigned int timeout) |
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{ |
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struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); |
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struct da9055 *da9055 = driver_data->da9055; |
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int ret, i; |
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for (i = 0; i < ARRAY_SIZE(da9055_wdt_maps); i++) |
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if (da9055_wdt_maps[i].user_time == timeout) |
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break; |
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if (i == ARRAY_SIZE(da9055_wdt_maps)) |
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ret = -EINVAL; |
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else |
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ret = da9055_reg_update(da9055, DA9055_REG_CONTROL_B, |
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DA9055_TWDSCALE_MASK, |
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da9055_wdt_maps[i].reg_val << |
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DA9055_TWDSCALE_SHIFT); |
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if (ret < 0) { |
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dev_err(da9055->dev, |
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"Failed to update timescale bit, %d\n", ret); |
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return ret; |
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} |
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wdt_dev->timeout = timeout; |
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return 0; |
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} |
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static int da9055_wdt_ping(struct watchdog_device *wdt_dev) |
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{ |
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struct da9055_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); |
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struct da9055 *da9055 = driver_data->da9055; |
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/* |
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* We have a minimum time for watchdog window called TWDMIN. A write |
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* to the watchdog before this elapsed time will cause an error. |
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*/ |
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mdelay(DA9055_TWDMIN); |
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/* Reset the watchdog timer */ |
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return da9055_reg_update(da9055, DA9055_REG_CONTROL_E, |
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DA9055_WATCHDOG_MASK, 1); |
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} |
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static int da9055_wdt_start(struct watchdog_device *wdt_dev) |
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{ |
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return da9055_wdt_set_timeout(wdt_dev, wdt_dev->timeout); |
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} |
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static int da9055_wdt_stop(struct watchdog_device *wdt_dev) |
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{ |
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return da9055_wdt_set_timeout(wdt_dev, 0); |
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} |
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static const struct watchdog_info da9055_wdt_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, |
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.identity = "DA9055 Watchdog", |
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}; |
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static const struct watchdog_ops da9055_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = da9055_wdt_start, |
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.stop = da9055_wdt_stop, |
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.ping = da9055_wdt_ping, |
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.set_timeout = da9055_wdt_set_timeout, |
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}; |
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static int da9055_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct da9055 *da9055 = dev_get_drvdata(dev->parent); |
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struct da9055_wdt_data *driver_data; |
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struct watchdog_device *da9055_wdt; |
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int ret; |
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driver_data = devm_kzalloc(dev, sizeof(*driver_data), GFP_KERNEL); |
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if (!driver_data) |
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return -ENOMEM; |
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driver_data->da9055 = da9055; |
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da9055_wdt = &driver_data->wdt; |
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da9055_wdt->timeout = DA9055_DEF_TIMEOUT; |
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da9055_wdt->info = &da9055_wdt_info; |
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da9055_wdt->ops = &da9055_wdt_ops; |
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da9055_wdt->parent = dev; |
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watchdog_set_nowayout(da9055_wdt, nowayout); |
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watchdog_set_drvdata(da9055_wdt, driver_data); |
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ret = da9055_wdt_stop(da9055_wdt); |
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if (ret < 0) { |
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dev_err(dev, "Failed to stop watchdog, %d\n", ret); |
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return ret; |
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} |
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ret = devm_watchdog_register_device(dev, &driver_data->wdt); |
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if (ret != 0) |
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dev_err(da9055->dev, "watchdog_register_device() failed: %d\n", |
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ret); |
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return ret; |
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} |
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static struct platform_driver da9055_wdt_driver = { |
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.probe = da9055_wdt_probe, |
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.driver = { |
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.name = "da9055-watchdog", |
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}, |
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}; |
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module_platform_driver(da9055_wdt_driver); |
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MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
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MODULE_DESCRIPTION("DA9055 watchdog"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9055-watchdog");
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