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194 lines
4.6 KiB
194 lines
4.6 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* System monitoring driver for DA9052 PMICs. |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: Anthony Olech <[email protected]> |
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* |
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*/ |
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#include <linux/module.h> |
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#include <linux/delay.h> |
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#include <linux/uaccess.h> |
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#include <linux/platform_device.h> |
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#include <linux/time.h> |
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#include <linux/watchdog.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/jiffies.h> |
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#include <linux/mfd/da9052/reg.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#define DA9052_DEF_TIMEOUT 4 |
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#define DA9052_TWDMIN 256 |
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struct da9052_wdt_data { |
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struct watchdog_device wdt; |
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struct da9052 *da9052; |
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unsigned long jpast; |
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}; |
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static const struct { |
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u8 reg_val; |
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int time; /* Seconds */ |
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} da9052_wdt_maps[] = { |
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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 da9052_wdt_set_timeout(struct watchdog_device *wdt_dev, |
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unsigned int timeout) |
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{ |
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); |
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struct da9052 *da9052 = driver_data->da9052; |
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int ret, i; |
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/* |
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* Disable the Watchdog timer before setting |
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* new time out. |
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*/ |
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, |
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DA9052_CONTROLD_TWDSCALE, 0); |
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if (ret < 0) { |
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dev_err(da9052->dev, "Failed to disable watchdog bit, %d\n", |
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ret); |
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return ret; |
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} |
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if (timeout) { |
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/* |
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* To change the timeout, da9052 needs to |
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* be disabled for at least 150 us. |
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*/ |
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udelay(150); |
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/* Set the desired timeout */ |
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for (i = 0; i < ARRAY_SIZE(da9052_wdt_maps); i++) |
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if (da9052_wdt_maps[i].time == timeout) |
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break; |
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if (i == ARRAY_SIZE(da9052_wdt_maps)) |
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ret = -EINVAL; |
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else |
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, |
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DA9052_CONTROLD_TWDSCALE, |
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da9052_wdt_maps[i].reg_val); |
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if (ret < 0) { |
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dev_err(da9052->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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driver_data->jpast = jiffies; |
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} |
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return 0; |
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} |
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static int da9052_wdt_start(struct watchdog_device *wdt_dev) |
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{ |
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return da9052_wdt_set_timeout(wdt_dev, wdt_dev->timeout); |
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} |
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static int da9052_wdt_stop(struct watchdog_device *wdt_dev) |
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{ |
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return da9052_wdt_set_timeout(wdt_dev, 0); |
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} |
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static int da9052_wdt_ping(struct watchdog_device *wdt_dev) |
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{ |
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struct da9052_wdt_data *driver_data = watchdog_get_drvdata(wdt_dev); |
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struct da9052 *da9052 = driver_data->da9052; |
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unsigned long msec, jnow = jiffies; |
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int ret; |
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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 should cause an error. |
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*/ |
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msec = (jnow - driver_data->jpast) * 1000/HZ; |
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if (msec < DA9052_TWDMIN) |
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mdelay(msec); |
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/* Reset the watchdog timer */ |
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, |
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DA9052_CONTROLD_WATCHDOG, 1 << 7); |
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if (ret < 0) |
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return ret; |
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/* |
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* FIXME: Reset the watchdog core, in general PMIC |
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* is supposed to do this |
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*/ |
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return da9052_reg_update(da9052, DA9052_CONTROL_D_REG, |
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DA9052_CONTROLD_WATCHDOG, 0 << 7); |
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} |
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static const struct watchdog_info da9052_wdt_info = { |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING, |
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.identity = "DA9052 Watchdog", |
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}; |
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static const struct watchdog_ops da9052_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = da9052_wdt_start, |
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.stop = da9052_wdt_stop, |
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.ping = da9052_wdt_ping, |
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.set_timeout = da9052_wdt_set_timeout, |
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}; |
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static int da9052_wdt_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct da9052 *da9052 = dev_get_drvdata(dev->parent); |
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struct da9052_wdt_data *driver_data; |
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struct watchdog_device *da9052_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->da9052 = da9052; |
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da9052_wdt = &driver_data->wdt; |
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da9052_wdt->timeout = DA9052_DEF_TIMEOUT; |
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da9052_wdt->info = &da9052_wdt_info; |
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da9052_wdt->ops = &da9052_wdt_ops; |
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da9052_wdt->parent = dev; |
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watchdog_set_drvdata(da9052_wdt, driver_data); |
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ret = da9052_reg_update(da9052, DA9052_CONTROL_D_REG, |
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DA9052_CONTROLD_TWDSCALE, 0); |
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if (ret < 0) { |
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dev_err(dev, "Failed to disable watchdog bits, %d\n", ret); |
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return ret; |
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} |
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return devm_watchdog_register_device(dev, &driver_data->wdt); |
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} |
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static struct platform_driver da9052_wdt_driver = { |
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.probe = da9052_wdt_probe, |
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.driver = { |
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.name = "da9052-watchdog", |
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}, |
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}; |
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module_platform_driver(da9052_wdt_driver); |
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MODULE_AUTHOR("Anthony Olech <[email protected]>"); |
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MODULE_DESCRIPTION("DA9052 SM Device Driver"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da9052-watchdog");
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