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https://github.com/edk2-porting/linux-next.git
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528eff34dd
Use device managed functions to simplify error handling, reduce source code size, improve readability, and reduce the likelyhood of bugs. The conversion was done automatically with coccinelle using the following semantic patches. The semantic patches and the scripts used to generate this commit log are available at https://github.com/groeck/coccinelle-patches - Replace 'val = e; return val;' with 'return e;' - Drop assignments to otherwise unused variables - Drop remove function - Drop dev_set_drvdata() - Use devm_watchdog_register_driver() to register watchdog device Acked-by: Adam Thomson <Adam.Thomson.Opensource@diasemi.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
249 lines
6.2 KiB
C
249 lines
6.2 KiB
C
/*
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* Watchdog device driver for DA9062 and DA9061 PMICs
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* Copyright (C) 2015 Dialog Semiconductor Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/kernel.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/uaccess.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <linux/mfd/da9062/registers.h>
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#include <linux/mfd/da9062/core.h>
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#include <linux/regmap.h>
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#include <linux/of.h>
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static const unsigned int wdt_timeout[] = { 0, 2, 4, 8, 16, 32, 65, 131 };
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#define DA9062_TWDSCALE_DISABLE 0
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#define DA9062_TWDSCALE_MIN 1
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#define DA9062_TWDSCALE_MAX (ARRAY_SIZE(wdt_timeout) - 1)
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#define DA9062_WDT_MIN_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MIN]
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#define DA9062_WDT_MAX_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX]
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#define DA9062_WDG_DEFAULT_TIMEOUT wdt_timeout[DA9062_TWDSCALE_MAX-1]
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#define DA9062_RESET_PROTECTION_MS 300
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struct da9062_watchdog {
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struct da9062 *hw;
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struct watchdog_device wdtdev;
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unsigned long j_time_stamp;
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};
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static void da9062_set_window_start(struct da9062_watchdog *wdt)
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{
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wdt->j_time_stamp = jiffies;
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}
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static void da9062_apply_window_protection(struct da9062_watchdog *wdt)
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{
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unsigned long delay = msecs_to_jiffies(DA9062_RESET_PROTECTION_MS);
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unsigned long timeout = wdt->j_time_stamp + delay;
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unsigned long now = jiffies;
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unsigned int diff_ms;
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/* if time-limit has not elapsed then wait for remainder */
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if (time_before(now, timeout)) {
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diff_ms = jiffies_to_msecs(timeout-now);
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dev_dbg(wdt->hw->dev,
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"Kicked too quickly. Delaying %u msecs\n", diff_ms);
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msleep(diff_ms);
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}
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}
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static unsigned int da9062_wdt_timeout_to_sel(unsigned int secs)
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{
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unsigned int i;
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for (i = DA9062_TWDSCALE_MIN; i <= DA9062_TWDSCALE_MAX; i++) {
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if (wdt_timeout[i] >= secs)
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return i;
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}
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return DA9062_TWDSCALE_MAX;
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}
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static int da9062_reset_watchdog_timer(struct da9062_watchdog *wdt)
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{
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int ret;
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da9062_apply_window_protection(wdt);
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ret = regmap_update_bits(wdt->hw->regmap,
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DA9062AA_CONTROL_F,
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DA9062AA_WATCHDOG_MASK,
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DA9062AA_WATCHDOG_MASK);
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da9062_set_window_start(wdt);
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return ret;
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}
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static int da9062_wdt_update_timeout_register(struct da9062_watchdog *wdt,
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unsigned int regval)
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{
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struct da9062 *chip = wdt->hw;
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int ret;
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ret = da9062_reset_watchdog_timer(wdt);
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if (ret)
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return ret;
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return regmap_update_bits(chip->regmap,
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DA9062AA_CONTROL_D,
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DA9062AA_TWDSCALE_MASK,
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regval);
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}
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static int da9062_wdt_start(struct watchdog_device *wdd)
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{
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struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9062_wdt_timeout_to_sel(wdt->wdtdev.timeout);
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ret = da9062_wdt_update_timeout_register(wdt, selector);
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if (ret)
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dev_err(wdt->hw->dev, "Watchdog failed to start (err = %d)\n",
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ret);
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return ret;
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}
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static int da9062_wdt_stop(struct watchdog_device *wdd)
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{
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struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = da9062_reset_watchdog_timer(wdt);
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if (ret) {
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dev_err(wdt->hw->dev, "Failed to ping the watchdog (err = %d)\n",
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ret);
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return ret;
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}
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ret = regmap_update_bits(wdt->hw->regmap,
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DA9062AA_CONTROL_D,
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DA9062AA_TWDSCALE_MASK,
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DA9062_TWDSCALE_DISABLE);
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if (ret)
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dev_err(wdt->hw->dev, "Watchdog failed to stop (err = %d)\n",
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ret);
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return ret;
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}
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static int da9062_wdt_ping(struct watchdog_device *wdd)
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{
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struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
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int ret;
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ret = da9062_reset_watchdog_timer(wdt);
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if (ret)
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dev_err(wdt->hw->dev, "Failed to ping the watchdog (err = %d)\n",
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ret);
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return ret;
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}
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static int da9062_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd);
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unsigned int selector;
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int ret;
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selector = da9062_wdt_timeout_to_sel(timeout);
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ret = da9062_wdt_update_timeout_register(wdt, selector);
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if (ret)
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dev_err(wdt->hw->dev, "Failed to set watchdog timeout (err = %d)\n",
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ret);
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else
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wdd->timeout = wdt_timeout[selector];
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return ret;
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}
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static const struct watchdog_info da9062_watchdog_info = {
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING,
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.identity = "DA9062 WDT",
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};
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static const struct watchdog_ops da9062_watchdog_ops = {
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.owner = THIS_MODULE,
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.start = da9062_wdt_start,
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.stop = da9062_wdt_stop,
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.ping = da9062_wdt_ping,
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.set_timeout = da9062_wdt_set_timeout,
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};
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static const struct of_device_id da9062_compatible_id_table[] = {
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{ .compatible = "dlg,da9062-watchdog", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, da9062_compatible_id_table);
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static int da9062_wdt_probe(struct platform_device *pdev)
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{
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int ret;
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struct da9062 *chip;
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struct da9062_watchdog *wdt;
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chip = dev_get_drvdata(pdev->dev.parent);
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if (!chip)
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return -EINVAL;
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wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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wdt->hw = chip;
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wdt->wdtdev.info = &da9062_watchdog_info;
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wdt->wdtdev.ops = &da9062_watchdog_ops;
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wdt->wdtdev.min_timeout = DA9062_WDT_MIN_TIMEOUT;
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wdt->wdtdev.max_timeout = DA9062_WDT_MAX_TIMEOUT;
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wdt->wdtdev.timeout = DA9062_WDG_DEFAULT_TIMEOUT;
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wdt->wdtdev.status = WATCHDOG_NOWAYOUT_INIT_STATUS;
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wdt->wdtdev.parent = &pdev->dev;
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watchdog_set_drvdata(&wdt->wdtdev, wdt);
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ret = devm_watchdog_register_device(&pdev->dev, &wdt->wdtdev);
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if (ret < 0) {
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dev_err(wdt->hw->dev,
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"watchdog registration failed (%d)\n", ret);
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return ret;
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}
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da9062_set_window_start(wdt);
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return da9062_wdt_ping(&wdt->wdtdev);
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}
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static struct platform_driver da9062_wdt_driver = {
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.probe = da9062_wdt_probe,
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.driver = {
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.name = "da9062-watchdog",
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.of_match_table = da9062_compatible_id_table,
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},
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};
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module_platform_driver(da9062_wdt_driver);
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MODULE_AUTHOR("S Twiss <stwiss.opensource@diasemi.com>");
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MODULE_DESCRIPTION("WDT device driver for Dialog DA9062 and DA9061");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da9062-watchdog");
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