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cc9cc794c3
The DT or ACPI tables should tell the driver what the irq flags are. Given that this driver probes only on DT based platforms and those DT platforms specify the irq flags we can safely drop the forced irq flag setting here. Cc: Andy Gross <agross@kernel.org> Cc: Bjorn Andersson <bjorn.andersson@linaro.org> Cc: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Link: https://lore.kernel.org/r/20200220002047.115000-1-swboyd@chromium.org [groeck: Context conflict resolution] Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
347 lines
7.8 KiB
C
347 lines
7.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
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*/
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#include <linux/bits.h>
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#include <linux/clk.h>
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#include <linux/delay.h>
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#include <linux/interrupt.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/of.h>
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#include <linux/platform_device.h>
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#include <linux/watchdog.h>
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#include <linux/of_device.h>
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enum wdt_reg {
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WDT_RST,
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WDT_EN,
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WDT_STS,
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WDT_BARK_TIME,
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WDT_BITE_TIME,
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};
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#define QCOM_WDT_ENABLE BIT(0)
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#define QCOM_WDT_ENABLE_IRQ BIT(1)
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static const u32 reg_offset_data_apcs_tmr[] = {
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[WDT_RST] = 0x38,
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[WDT_EN] = 0x40,
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[WDT_STS] = 0x44,
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[WDT_BARK_TIME] = 0x4C,
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[WDT_BITE_TIME] = 0x5C,
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};
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static const u32 reg_offset_data_kpss[] = {
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[WDT_RST] = 0x4,
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[WDT_EN] = 0x8,
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[WDT_STS] = 0xC,
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[WDT_BARK_TIME] = 0x10,
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[WDT_BITE_TIME] = 0x14,
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};
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struct qcom_wdt_match_data {
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const u32 *offset;
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bool pretimeout;
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};
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struct qcom_wdt {
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struct watchdog_device wdd;
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unsigned long rate;
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void __iomem *base;
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const u32 *layout;
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};
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static void __iomem *wdt_addr(struct qcom_wdt *wdt, enum wdt_reg reg)
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{
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return wdt->base + wdt->layout[reg];
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}
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static inline
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struct qcom_wdt *to_qcom_wdt(struct watchdog_device *wdd)
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{
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return container_of(wdd, struct qcom_wdt, wdd);
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}
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static inline int qcom_get_enable(struct watchdog_device *wdd)
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{
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int enable = QCOM_WDT_ENABLE;
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if (wdd->pretimeout)
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enable |= QCOM_WDT_ENABLE_IRQ;
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return enable;
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}
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static irqreturn_t qcom_wdt_isr(int irq, void *arg)
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{
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struct watchdog_device *wdd = arg;
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watchdog_notify_pretimeout(wdd);
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return IRQ_HANDLED;
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}
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static int qcom_wdt_start(struct watchdog_device *wdd)
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{
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struct qcom_wdt *wdt = to_qcom_wdt(wdd);
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unsigned int bark = wdd->timeout - wdd->pretimeout;
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writel(0, wdt_addr(wdt, WDT_EN));
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writel(1, wdt_addr(wdt, WDT_RST));
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writel(bark * wdt->rate, wdt_addr(wdt, WDT_BARK_TIME));
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writel(wdd->timeout * wdt->rate, wdt_addr(wdt, WDT_BITE_TIME));
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writel(qcom_get_enable(wdd), wdt_addr(wdt, WDT_EN));
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return 0;
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}
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static int qcom_wdt_stop(struct watchdog_device *wdd)
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{
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struct qcom_wdt *wdt = to_qcom_wdt(wdd);
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writel(0, wdt_addr(wdt, WDT_EN));
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return 0;
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}
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static int qcom_wdt_ping(struct watchdog_device *wdd)
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{
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struct qcom_wdt *wdt = to_qcom_wdt(wdd);
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writel(1, wdt_addr(wdt, WDT_RST));
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return 0;
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}
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static int qcom_wdt_set_timeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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wdd->timeout = timeout;
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return qcom_wdt_start(wdd);
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}
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static int qcom_wdt_set_pretimeout(struct watchdog_device *wdd,
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unsigned int timeout)
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{
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wdd->pretimeout = timeout;
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return qcom_wdt_start(wdd);
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}
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static int qcom_wdt_restart(struct watchdog_device *wdd, unsigned long action,
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void *data)
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{
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struct qcom_wdt *wdt = to_qcom_wdt(wdd);
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u32 timeout;
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/*
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* Trigger watchdog bite:
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* Setup BITE_TIME to be 128ms, and enable WDT.
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*/
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timeout = 128 * wdt->rate / 1000;
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writel(0, wdt_addr(wdt, WDT_EN));
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writel(1, wdt_addr(wdt, WDT_RST));
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writel(timeout, wdt_addr(wdt, WDT_BARK_TIME));
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writel(timeout, wdt_addr(wdt, WDT_BITE_TIME));
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writel(QCOM_WDT_ENABLE, wdt_addr(wdt, WDT_EN));
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/*
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* Actually make sure the above sequence hits hardware before sleeping.
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*/
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wmb();
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msleep(150);
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return 0;
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}
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static const struct watchdog_ops qcom_wdt_ops = {
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.start = qcom_wdt_start,
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.stop = qcom_wdt_stop,
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.ping = qcom_wdt_ping,
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.set_timeout = qcom_wdt_set_timeout,
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.set_pretimeout = qcom_wdt_set_pretimeout,
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.restart = qcom_wdt_restart,
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.owner = THIS_MODULE,
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};
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static const struct watchdog_info qcom_wdt_info = {
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.options = WDIOF_KEEPALIVEPING
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| WDIOF_MAGICCLOSE
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| WDIOF_SETTIMEOUT
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| WDIOF_CARDRESET,
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.identity = KBUILD_MODNAME,
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};
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static const struct watchdog_info qcom_wdt_pt_info = {
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.options = WDIOF_KEEPALIVEPING
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| WDIOF_MAGICCLOSE
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| WDIOF_SETTIMEOUT
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| WDIOF_PRETIMEOUT
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| WDIOF_CARDRESET,
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.identity = KBUILD_MODNAME,
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};
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static void qcom_clk_disable_unprepare(void *data)
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{
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clk_disable_unprepare(data);
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}
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static const struct qcom_wdt_match_data match_data_apcs_tmr = {
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.offset = reg_offset_data_apcs_tmr,
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.pretimeout = false,
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};
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static const struct qcom_wdt_match_data match_data_kpss = {
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.offset = reg_offset_data_kpss,
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.pretimeout = true,
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};
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static int qcom_wdt_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct qcom_wdt *wdt;
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struct resource *res;
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struct device_node *np = dev->of_node;
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const struct qcom_wdt_match_data *data;
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u32 percpu_offset;
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int irq, ret;
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struct clk *clk;
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data = of_device_get_match_data(dev);
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if (!data) {
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dev_err(dev, "Unsupported QCOM WDT module\n");
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return -ENODEV;
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}
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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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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENOMEM;
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/* We use CPU0's DGT for the watchdog */
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if (of_property_read_u32(np, "cpu-offset", &percpu_offset))
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percpu_offset = 0;
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res->start += percpu_offset;
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res->end += percpu_offset;
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wdt->base = devm_ioremap_resource(dev, res);
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if (IS_ERR(wdt->base))
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return PTR_ERR(wdt->base);
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clk = devm_clk_get(dev, NULL);
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if (IS_ERR(clk)) {
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dev_err(dev, "failed to get input clock\n");
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return PTR_ERR(clk);
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}
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ret = clk_prepare_enable(clk);
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if (ret) {
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dev_err(dev, "failed to setup clock\n");
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return ret;
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}
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ret = devm_add_action_or_reset(dev, qcom_clk_disable_unprepare, clk);
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if (ret)
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return ret;
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/*
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* We use the clock rate to calculate the max timeout, so ensure it's
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* not zero to avoid a divide-by-zero exception.
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*
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* WATCHDOG_CORE assumes units of seconds, if the WDT is clocked such
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* that it would bite before a second elapses it's usefulness is
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* limited. Bail if this is the case.
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*/
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wdt->rate = clk_get_rate(clk);
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if (wdt->rate == 0 ||
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wdt->rate > 0x10000000U) {
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dev_err(dev, "invalid clock rate\n");
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return -EINVAL;
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}
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/* check if there is pretimeout support */
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irq = platform_get_irq_optional(pdev, 0);
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if (data->pretimeout && irq > 0) {
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ret = devm_request_irq(dev, irq, qcom_wdt_isr, 0,
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"wdt_bark", &wdt->wdd);
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if (ret)
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return ret;
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wdt->wdd.info = &qcom_wdt_pt_info;
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wdt->wdd.pretimeout = 1;
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} else {
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if (irq == -EPROBE_DEFER)
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return -EPROBE_DEFER;
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wdt->wdd.info = &qcom_wdt_info;
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}
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wdt->wdd.ops = &qcom_wdt_ops;
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wdt->wdd.min_timeout = 1;
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wdt->wdd.max_timeout = 0x10000000U / wdt->rate;
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wdt->wdd.parent = dev;
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wdt->layout = data->offset;
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if (readl(wdt_addr(wdt, WDT_STS)) & 1)
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wdt->wdd.bootstatus = WDIOF_CARDRESET;
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/*
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* If 'timeout-sec' unspecified in devicetree, assume a 30 second
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* default, unless the max timeout is less than 30 seconds, then use
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* the max instead.
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*/
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wdt->wdd.timeout = min(wdt->wdd.max_timeout, 30U);
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watchdog_init_timeout(&wdt->wdd, 0, dev);
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ret = devm_watchdog_register_device(dev, &wdt->wdd);
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if (ret)
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return ret;
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platform_set_drvdata(pdev, wdt);
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return 0;
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}
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static int __maybe_unused qcom_wdt_suspend(struct device *dev)
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{
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struct qcom_wdt *wdt = dev_get_drvdata(dev);
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if (watchdog_active(&wdt->wdd))
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qcom_wdt_stop(&wdt->wdd);
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return 0;
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}
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static int __maybe_unused qcom_wdt_resume(struct device *dev)
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{
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struct qcom_wdt *wdt = dev_get_drvdata(dev);
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if (watchdog_active(&wdt->wdd))
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qcom_wdt_start(&wdt->wdd);
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return 0;
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}
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static SIMPLE_DEV_PM_OPS(qcom_wdt_pm_ops, qcom_wdt_suspend, qcom_wdt_resume);
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static const struct of_device_id qcom_wdt_of_table[] = {
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{ .compatible = "qcom,kpss-timer", .data = &match_data_apcs_tmr },
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{ .compatible = "qcom,scss-timer", .data = &match_data_apcs_tmr },
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{ .compatible = "qcom,kpss-wdt", .data = &match_data_kpss },
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{ },
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};
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MODULE_DEVICE_TABLE(of, qcom_wdt_of_table);
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static struct platform_driver qcom_watchdog_driver = {
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.probe = qcom_wdt_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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.of_match_table = qcom_wdt_of_table,
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.pm = &qcom_wdt_pm_ops,
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},
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};
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module_platform_driver(qcom_watchdog_driver);
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MODULE_DESCRIPTION("QCOM KPSS Watchdog Driver");
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MODULE_LICENSE("GPL v2");
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