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i.MX system controller watchdog can support pretimeout IRQ via general SCU MU IRQ, it depends on IMX_SCU and driver MUST be probed after SCU IPC ready, then enable corresponding SCU IRQ group and register SCU IRQ notifier, when watchdog pretimeout IRQ fires, SCU MU IRQ will be handled and watchdog pretimeout notifier will be called to handle the event. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
255 lines
6.1 KiB
C
255 lines
6.1 KiB
C
// 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/init.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/reboot.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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arm_smccc_smc(IMX_SIP_TIMER, IMX_SIP_TIMER_SET_PRETIME_WDOG,
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pretimeout * 1000, 0, 0, 0, 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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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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dev_err(dev, "Failed to register watchdog device\n");
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return ret;
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}
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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 <yibin.gong@nxp.com>");
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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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