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![Shruthi Sanil](/assets/img/avatar_default.png)
Corrected typos, aligned the tabs and added new lines wherever required for better readability Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Tested-by: Kris Pan <kris.pan@intel.com> Signed-off-by: Shruthi Sanil <shruthi.sanil@intel.com> Link: https://lore.kernel.org/r/20210517174953.19404-10-shruthi.sanil@intel.com Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
296 lines
7.6 KiB
C
296 lines
7.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Watchdog driver for Intel Keem Bay non-secure watchdog.
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*
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* Copyright (C) 2020 Intel Corporation
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*/
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#include <linux/arm-smccc.h>
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/limits.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.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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/* Non-secure watchdog register offsets */
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#define TIM_WATCHDOG 0x0
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#define TIM_WATCHDOG_INT_THRES 0x4
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#define TIM_WDOG_EN 0x8
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#define TIM_SAFE 0xc
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#define WDT_TH_INT_MASK BIT(8)
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#define WDT_TO_INT_MASK BIT(9)
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#define WDT_INT_CLEAR_SMC 0x8200ff18
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#define WDT_UNLOCK 0xf1d0dead
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#define WDT_DISABLE 0x0
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#define WDT_ENABLE 0x1
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#define WDT_LOAD_MAX U32_MAX
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#define WDT_LOAD_MIN 1
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#define WDT_TIMEOUT 5
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#define WDT_PRETIMEOUT 4
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static unsigned int timeout = WDT_TIMEOUT;
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module_param(timeout, int, 0);
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MODULE_PARM_DESC(timeout, "Watchdog timeout period in seconds (default = "
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__MODULE_STRING(WDT_TIMEOUT) ")");
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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, "Watchdog cannot be stopped once started (default = "
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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struct keembay_wdt {
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struct watchdog_device wdd;
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struct clk *clk;
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unsigned int rate;
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int to_irq;
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int th_irq;
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void __iomem *base;
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};
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static inline u32 keembay_wdt_readl(struct keembay_wdt *wdt, u32 offset)
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{
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return readl(wdt->base + offset);
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}
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static inline void keembay_wdt_writel(struct keembay_wdt *wdt, u32 offset, u32 val)
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{
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writel(WDT_UNLOCK, wdt->base + TIM_SAFE);
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writel(val, wdt->base + offset);
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}
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static void keembay_wdt_set_timeout_reg(struct watchdog_device *wdog)
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{
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struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
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keembay_wdt_writel(wdt, TIM_WATCHDOG, wdog->timeout * wdt->rate);
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}
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static void keembay_wdt_set_pretimeout_reg(struct watchdog_device *wdog)
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{
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struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
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u32 th_val = 0;
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if (wdog->pretimeout)
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th_val = wdog->timeout - wdog->pretimeout;
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keembay_wdt_writel(wdt, TIM_WATCHDOG_INT_THRES, th_val * wdt->rate);
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}
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static int keembay_wdt_start(struct watchdog_device *wdog)
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{
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struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
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keembay_wdt_writel(wdt, TIM_WDOG_EN, WDT_ENABLE);
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return 0;
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}
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static int keembay_wdt_stop(struct watchdog_device *wdog)
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{
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struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
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keembay_wdt_writel(wdt, TIM_WDOG_EN, WDT_DISABLE);
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return 0;
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}
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static int keembay_wdt_ping(struct watchdog_device *wdog)
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{
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keembay_wdt_set_timeout_reg(wdog);
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return 0;
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}
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static int keembay_wdt_set_timeout(struct watchdog_device *wdog, u32 t)
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{
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wdog->timeout = t;
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keembay_wdt_set_timeout_reg(wdog);
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keembay_wdt_set_pretimeout_reg(wdog);
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return 0;
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}
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static int keembay_wdt_set_pretimeout(struct watchdog_device *wdog, u32 t)
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{
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if (t > wdog->timeout)
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return -EINVAL;
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wdog->pretimeout = t;
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keembay_wdt_set_pretimeout_reg(wdog);
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return 0;
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}
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static unsigned int keembay_wdt_get_timeleft(struct watchdog_device *wdog)
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{
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struct keembay_wdt *wdt = watchdog_get_drvdata(wdog);
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return keembay_wdt_readl(wdt, TIM_WATCHDOG) / wdt->rate;
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}
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/*
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* SMC call is used to clear the interrupt bits, because the TIM_GEN_CONFIG
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* register is in the secure bank.
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*/
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static irqreturn_t keembay_wdt_to_isr(int irq, void *dev_id)
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{
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struct keembay_wdt *wdt = dev_id;
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struct arm_smccc_res res;
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arm_smccc_smc(WDT_INT_CLEAR_SMC, WDT_TO_INT_MASK, 0, 0, 0, 0, 0, 0, &res);
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dev_crit(wdt->wdd.parent, "Intel Keem Bay non-secure wdt timeout.\n");
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emergency_restart();
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return IRQ_HANDLED;
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}
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static irqreturn_t keembay_wdt_th_isr(int irq, void *dev_id)
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{
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struct keembay_wdt *wdt = dev_id;
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struct arm_smccc_res res;
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keembay_wdt_set_pretimeout(&wdt->wdd, 0x0);
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arm_smccc_smc(WDT_INT_CLEAR_SMC, WDT_TH_INT_MASK, 0, 0, 0, 0, 0, 0, &res);
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dev_crit(wdt->wdd.parent, "Intel Keem Bay non-secure wdt pre-timeout.\n");
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watchdog_notify_pretimeout(&wdt->wdd);
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return IRQ_HANDLED;
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}
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static const struct watchdog_info keembay_wdt_info = {
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.identity = "Intel Keem Bay Watchdog Timer",
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.options = WDIOF_SETTIMEOUT |
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WDIOF_PRETIMEOUT |
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WDIOF_MAGICCLOSE |
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WDIOF_KEEPALIVEPING,
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};
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static const struct watchdog_ops keembay_wdt_ops = {
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.owner = THIS_MODULE,
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.start = keembay_wdt_start,
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.stop = keembay_wdt_stop,
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.ping = keembay_wdt_ping,
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.set_timeout = keembay_wdt_set_timeout,
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.set_pretimeout = keembay_wdt_set_pretimeout,
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.get_timeleft = keembay_wdt_get_timeleft,
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};
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static int keembay_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct keembay_wdt *wdt;
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int ret;
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wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
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if (!wdt)
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return -ENOMEM;
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wdt->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(wdt->base))
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return PTR_ERR(wdt->base);
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/* we do not need to enable the clock as it is enabled by default */
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wdt->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(wdt->clk))
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return dev_err_probe(dev, PTR_ERR(wdt->clk), "Failed to get clock\n");
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wdt->rate = clk_get_rate(wdt->clk);
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if (!wdt->rate)
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return dev_err_probe(dev, -EINVAL, "Failed to get clock rate\n");
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wdt->th_irq = platform_get_irq_byname(pdev, "threshold");
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if (wdt->th_irq < 0)
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return dev_err_probe(dev, wdt->th_irq, "Failed to get IRQ for threshold\n");
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ret = devm_request_irq(dev, wdt->th_irq, keembay_wdt_th_isr, 0,
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"keembay-wdt", wdt);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to request IRQ for threshold\n");
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wdt->to_irq = platform_get_irq_byname(pdev, "timeout");
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if (wdt->to_irq < 0)
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return dev_err_probe(dev, wdt->to_irq, "Failed to get IRQ for timeout\n");
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ret = devm_request_irq(dev, wdt->to_irq, keembay_wdt_to_isr, 0,
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"keembay-wdt", wdt);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to request IRQ for timeout\n");
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wdt->wdd.parent = dev;
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wdt->wdd.info = &keembay_wdt_info;
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wdt->wdd.ops = &keembay_wdt_ops;
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wdt->wdd.min_timeout = WDT_LOAD_MIN;
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wdt->wdd.max_timeout = WDT_LOAD_MAX / wdt->rate;
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wdt->wdd.timeout = WDT_TIMEOUT;
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wdt->wdd.pretimeout = WDT_PRETIMEOUT;
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watchdog_set_drvdata(&wdt->wdd, wdt);
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watchdog_set_nowayout(&wdt->wdd, nowayout);
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watchdog_init_timeout(&wdt->wdd, timeout, dev);
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keembay_wdt_set_timeout(&wdt->wdd, wdt->wdd.timeout);
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keembay_wdt_set_pretimeout(&wdt->wdd, wdt->wdd.pretimeout);
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ret = devm_watchdog_register_device(dev, &wdt->wdd);
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if (ret)
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return dev_err_probe(dev, ret, "Failed to register watchdog device.\n");
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platform_set_drvdata(pdev, wdt);
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dev_info(dev, "Initial timeout %d sec%s.\n",
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wdt->wdd.timeout, nowayout ? ", nowayout" : "");
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return 0;
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}
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static int __maybe_unused keembay_wdt_suspend(struct device *dev)
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{
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struct keembay_wdt *wdt = dev_get_drvdata(dev);
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if (watchdog_active(&wdt->wdd))
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return keembay_wdt_stop(&wdt->wdd);
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return 0;
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}
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static int __maybe_unused keembay_wdt_resume(struct device *dev)
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{
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struct keembay_wdt *wdt = dev_get_drvdata(dev);
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if (watchdog_active(&wdt->wdd))
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return keembay_wdt_start(&wdt->wdd);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(keembay_wdt_pm_ops, keembay_wdt_suspend,
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keembay_wdt_resume);
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static const struct of_device_id keembay_wdt_match[] = {
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{ .compatible = "intel,keembay-wdt" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, keembay_wdt_match);
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static struct platform_driver keembay_wdt_driver = {
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.probe = keembay_wdt_probe,
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.driver = {
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.name = "keembay_wdt",
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.of_match_table = keembay_wdt_match,
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.pm = &keembay_wdt_pm_ops,
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},
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};
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module_platform_driver(keembay_wdt_driver);
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MODULE_DESCRIPTION("Intel Keem Bay SoC watchdog driver");
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MODULE_AUTHOR("Wan Ahmad Zainie <wan.ahmad.zainie.wan.mohamad@intel.com");
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MODULE_LICENSE("GPL v2");
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