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260 lines
6.3 KiB
260 lines
6.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright 2018-2019 NXP. |
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*/ |
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#include <linux/arm-smccc.h> |
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#include <linux/firmware/imx/sci.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/watchdog.h> |
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#define DEFAULT_TIMEOUT 60 |
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/* |
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* Software timer tick implemented in scfw side, support 10ms to 0xffffffff ms |
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* in theory, but for normal case, 1s~128s is enough, you can change this max |
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* value in case it's not enough. |
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*/ |
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#define MAX_TIMEOUT 128 |
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#define IMX_SIP_TIMER 0xC2000002 |
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#define IMX_SIP_TIMER_START_WDOG 0x01 |
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#define IMX_SIP_TIMER_STOP_WDOG 0x02 |
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#define IMX_SIP_TIMER_SET_WDOG_ACT 0x03 |
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#define IMX_SIP_TIMER_PING_WDOG 0x04 |
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#define IMX_SIP_TIMER_SET_TIMEOUT_WDOG 0x05 |
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#define IMX_SIP_TIMER_GET_WDOG_STAT 0x06 |
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#define IMX_SIP_TIMER_SET_PRETIME_WDOG 0x07 |
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#define SC_TIMER_WDOG_ACTION_PARTITION 0 |
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#define SC_IRQ_WDOG 1 |
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#define SC_IRQ_GROUP_WDOG 1 |
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static bool nowayout = WATCHDOG_NOWAYOUT; |
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module_param(nowayout, bool, 0000); |
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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 imx_sc_wdt_device { |
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struct watchdog_device wdd; |
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struct notifier_block wdt_notifier; |
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}; |
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static int imx_sc_wdt_ping(struct watchdog_device *wdog) |
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{ |
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struct arm_smccc_res res; |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_PING_WDOG, |
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0, 0, 0, 0, 0, 0, &res); |
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return 0; |
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} |
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static int imx_sc_wdt_start(struct watchdog_device *wdog) |
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{ |
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struct arm_smccc_res res; |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_START_WDOG, |
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0, 0, 0, 0, 0, 0, &res); |
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if (res.a0) |
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return -EACCES; |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_WDOG_ACT, |
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SC_TIMER_WDOG_ACTION_PARTITION, |
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0, 0, 0, 0, 0, &res); |
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return res.a0 ? -EACCES : 0; |
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} |
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static int imx_sc_wdt_stop(struct watchdog_device *wdog) |
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{ |
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struct arm_smccc_res res; |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_STOP_WDOG, |
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0, 0, 0, 0, 0, 0, &res); |
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return res.a0 ? -EACCES : 0; |
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} |
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static int imx_sc_wdt_set_timeout(struct watchdog_device *wdog, |
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unsigned int timeout) |
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{ |
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struct arm_smccc_res res; |
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wdog->timeout = timeout; |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_TIMEOUT_WDOG, |
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timeout * 1000, 0, 0, 0, 0, 0, &res); |
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return res.a0 ? -EACCES : 0; |
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} |
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static int imx_sc_wdt_set_pretimeout(struct watchdog_device *wdog, |
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unsigned int pretimeout) |
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{ |
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struct arm_smccc_res res; |
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/* |
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* SCU firmware calculates pretimeout based on current time |
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* stamp instead of watchdog timeout stamp, need to convert |
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* the pretimeout to SCU firmware's timeout value. |
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*/ |
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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG, |
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(wdog->timeout - pretimeout) * 1000, 0, 0, 0, |
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0, 0, &res); |
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if (res.a0) |
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return -EACCES; |
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wdog->pretimeout = pretimeout; |
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return 0; |
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} |
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static int imx_sc_wdt_notify(struct notifier_block *nb, |
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unsigned long event, void *group) |
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{ |
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struct imx_sc_wdt_device *imx_sc_wdd = |
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container_of(nb, |
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struct imx_sc_wdt_device, |
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wdt_notifier); |
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if (event & SC_IRQ_WDOG && |
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*(u8 *)group == SC_IRQ_GROUP_WDOG) |
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watchdog_notify_pretimeout(&imx_sc_wdd->wdd); |
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return 0; |
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} |
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static void imx_sc_wdt_action(void *data) |
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{ |
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struct notifier_block *wdt_notifier = data; |
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imx_scu_irq_unregister_notifier(wdt_notifier); |
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imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG, |
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SC_IRQ_WDOG, |
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false); |
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} |
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static const struct watchdog_ops imx_sc_wdt_ops = { |
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.owner = THIS_MODULE, |
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.start = imx_sc_wdt_start, |
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.stop = imx_sc_wdt_stop, |
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.ping = imx_sc_wdt_ping, |
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.set_timeout = imx_sc_wdt_set_timeout, |
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.set_pretimeout = imx_sc_wdt_set_pretimeout, |
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}; |
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static struct watchdog_info imx_sc_wdt_info = { |
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.identity = "i.MX SC watchdog timer", |
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | |
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WDIOF_MAGICCLOSE, |
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}; |
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static int imx_sc_wdt_probe(struct platform_device *pdev) |
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{ |
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struct imx_sc_wdt_device *imx_sc_wdd; |
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struct watchdog_device *wdog; |
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struct device *dev = &pdev->dev; |
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int ret; |
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imx_sc_wdd = devm_kzalloc(dev, sizeof(*imx_sc_wdd), GFP_KERNEL); |
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if (!imx_sc_wdd) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, imx_sc_wdd); |
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wdog = &imx_sc_wdd->wdd; |
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wdog->info = &imx_sc_wdt_info; |
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wdog->ops = &imx_sc_wdt_ops; |
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wdog->min_timeout = 1; |
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wdog->max_timeout = MAX_TIMEOUT; |
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wdog->parent = dev; |
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wdog->timeout = DEFAULT_TIMEOUT; |
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watchdog_init_timeout(wdog, 0, dev); |
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ret = imx_sc_wdt_set_timeout(wdog, wdog->timeout); |
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if (ret) |
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return ret; |
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watchdog_stop_on_reboot(wdog); |
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watchdog_stop_on_unregister(wdog); |
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ret = devm_watchdog_register_device(dev, wdog); |
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if (ret) |
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return ret; |
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ret = imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG, |
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SC_IRQ_WDOG, |
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true); |
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if (ret) { |
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dev_warn(dev, "Enable irq failed, pretimeout NOT supported\n"); |
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return 0; |
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} |
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imx_sc_wdd->wdt_notifier.notifier_call = imx_sc_wdt_notify; |
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ret = imx_scu_irq_register_notifier(&imx_sc_wdd->wdt_notifier); |
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if (ret) { |
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imx_scu_irq_group_enable(SC_IRQ_GROUP_WDOG, |
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SC_IRQ_WDOG, |
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false); |
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dev_warn(dev, |
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"Register irq notifier failed, pretimeout NOT supported\n"); |
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return 0; |
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} |
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ret = devm_add_action_or_reset(dev, imx_sc_wdt_action, |
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&imx_sc_wdd->wdt_notifier); |
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if (!ret) |
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imx_sc_wdt_info.options |= WDIOF_PRETIMEOUT; |
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else |
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dev_warn(dev, "Add action failed, pretimeout NOT supported\n"); |
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return 0; |
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} |
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static int __maybe_unused imx_sc_wdt_suspend(struct device *dev) |
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{ |
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struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev); |
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if (watchdog_active(&imx_sc_wdd->wdd)) |
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imx_sc_wdt_stop(&imx_sc_wdd->wdd); |
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return 0; |
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} |
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static int __maybe_unused imx_sc_wdt_resume(struct device *dev) |
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{ |
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struct imx_sc_wdt_device *imx_sc_wdd = dev_get_drvdata(dev); |
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if (watchdog_active(&imx_sc_wdd->wdd)) |
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imx_sc_wdt_start(&imx_sc_wdd->wdd); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(imx_sc_wdt_pm_ops, |
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imx_sc_wdt_suspend, imx_sc_wdt_resume); |
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static const struct of_device_id imx_sc_wdt_dt_ids[] = { |
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{ .compatible = "fsl,imx-sc-wdt", }, |
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{ /* sentinel */ } |
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}; |
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MODULE_DEVICE_TABLE(of, imx_sc_wdt_dt_ids); |
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static struct platform_driver imx_sc_wdt_driver = { |
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.probe = imx_sc_wdt_probe, |
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.driver = { |
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.name = "imx-sc-wdt", |
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.of_match_table = imx_sc_wdt_dt_ids, |
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.pm = &imx_sc_wdt_pm_ops, |
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}, |
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}; |
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module_platform_driver(imx_sc_wdt_driver); |
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MODULE_AUTHOR("Robin Gong <[email protected]>"); |
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MODULE_DESCRIPTION("NXP i.MX system controller watchdog driver"); |
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MODULE_LICENSE("GPL v2");
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