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328 lines
7.4 KiB
328 lines
7.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright © 2014-2017 Broadcom |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/clk.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/init.h> |
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#include <linux/interrupt.h> |
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#include <linux/io.h> |
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#include <linux/irqreturn.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/pm.h> |
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#include <linux/pm_wakeup.h> |
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#include <linux/reboot.h> |
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#include <linux/rtc.h> |
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#include <linux/stat.h> |
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#include <linux/suspend.h> |
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struct brcmstb_waketmr { |
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struct rtc_device *rtc; |
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struct device *dev; |
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void __iomem *base; |
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int irq; |
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struct notifier_block reboot_notifier; |
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struct clk *clk; |
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u32 rate; |
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}; |
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#define BRCMSTB_WKTMR_EVENT 0x00 |
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#define BRCMSTB_WKTMR_COUNTER 0x04 |
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#define BRCMSTB_WKTMR_ALARM 0x08 |
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#define BRCMSTB_WKTMR_PRESCALER 0x0C |
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#define BRCMSTB_WKTMR_PRESCALER_VAL 0x10 |
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#define BRCMSTB_WKTMR_DEFAULT_FREQ 27000000 |
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static inline void brcmstb_waketmr_clear_alarm(struct brcmstb_waketmr *timer) |
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{ |
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writel_relaxed(1, timer->base + BRCMSTB_WKTMR_EVENT); |
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(void)readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT); |
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} |
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static void brcmstb_waketmr_set_alarm(struct brcmstb_waketmr *timer, |
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unsigned int secs) |
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{ |
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brcmstb_waketmr_clear_alarm(timer); |
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/* Make sure we are actually counting in seconds */ |
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writel_relaxed(timer->rate, timer->base + BRCMSTB_WKTMR_PRESCALER); |
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writel_relaxed(secs + 1, timer->base + BRCMSTB_WKTMR_ALARM); |
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} |
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static irqreturn_t brcmstb_waketmr_irq(int irq, void *data) |
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{ |
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struct brcmstb_waketmr *timer = data; |
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pm_wakeup_event(timer->dev, 0); |
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return IRQ_HANDLED; |
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} |
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struct wktmr_time { |
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u32 sec; |
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u32 pre; |
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}; |
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static void wktmr_read(struct brcmstb_waketmr *timer, |
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struct wktmr_time *t) |
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{ |
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u32 tmp; |
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do { |
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t->sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_COUNTER); |
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tmp = readl_relaxed(timer->base + BRCMSTB_WKTMR_PRESCALER_VAL); |
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} while (tmp >= timer->rate); |
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t->pre = timer->rate - tmp; |
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} |
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static int brcmstb_waketmr_prepare_suspend(struct brcmstb_waketmr *timer) |
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{ |
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struct device *dev = timer->dev; |
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int ret = 0; |
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if (device_may_wakeup(dev)) { |
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ret = enable_irq_wake(timer->irq); |
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if (ret) { |
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dev_err(dev, "failed to enable wake-up interrupt\n"); |
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return ret; |
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} |
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} |
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return ret; |
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} |
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/* If enabled as a wakeup-source, arm the timer when powering off */ |
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static int brcmstb_waketmr_reboot(struct notifier_block *nb, |
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unsigned long action, void *data) |
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{ |
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struct brcmstb_waketmr *timer; |
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timer = container_of(nb, struct brcmstb_waketmr, reboot_notifier); |
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/* Set timer for cold boot */ |
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if (action == SYS_POWER_OFF) |
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brcmstb_waketmr_prepare_suspend(timer); |
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return NOTIFY_DONE; |
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} |
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static int brcmstb_waketmr_gettime(struct device *dev, |
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struct rtc_time *tm) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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struct wktmr_time now; |
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wktmr_read(timer, &now); |
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rtc_time64_to_tm(now.sec, tm); |
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return 0; |
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} |
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static int brcmstb_waketmr_settime(struct device *dev, |
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struct rtc_time *tm) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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time64_t sec; |
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sec = rtc_tm_to_time64(tm); |
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writel_relaxed(sec, timer->base + BRCMSTB_WKTMR_COUNTER); |
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return 0; |
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} |
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static int brcmstb_waketmr_getalarm(struct device *dev, |
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struct rtc_wkalrm *alarm) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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time64_t sec; |
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u32 reg; |
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sec = readl_relaxed(timer->base + BRCMSTB_WKTMR_ALARM); |
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if (sec != 0) { |
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/* Alarm is enabled */ |
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alarm->enabled = 1; |
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rtc_time64_to_tm(sec, &alarm->time); |
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} |
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reg = readl_relaxed(timer->base + BRCMSTB_WKTMR_EVENT); |
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alarm->pending = !!(reg & 1); |
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return 0; |
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} |
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static int brcmstb_waketmr_setalarm(struct device *dev, |
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struct rtc_wkalrm *alarm) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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time64_t sec; |
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if (alarm->enabled) |
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sec = rtc_tm_to_time64(&alarm->time); |
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else |
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sec = 0; |
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brcmstb_waketmr_set_alarm(timer, sec); |
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return 0; |
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} |
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/* |
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* Does not do much but keep the RTC class happy. We always support |
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* alarms. |
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*/ |
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static int brcmstb_waketmr_alarm_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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return 0; |
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} |
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static const struct rtc_class_ops brcmstb_waketmr_ops = { |
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.read_time = brcmstb_waketmr_gettime, |
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.set_time = brcmstb_waketmr_settime, |
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.read_alarm = brcmstb_waketmr_getalarm, |
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.set_alarm = brcmstb_waketmr_setalarm, |
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.alarm_irq_enable = brcmstb_waketmr_alarm_enable, |
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}; |
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static int brcmstb_waketmr_probe(struct platform_device *pdev) |
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{ |
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struct device *dev = &pdev->dev; |
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struct brcmstb_waketmr *timer; |
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int ret; |
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timer = devm_kzalloc(dev, sizeof(*timer), GFP_KERNEL); |
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if (!timer) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, timer); |
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timer->dev = dev; |
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timer->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(timer->base)) |
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return PTR_ERR(timer->base); |
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timer->rtc = devm_rtc_allocate_device(dev); |
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if (IS_ERR(timer->rtc)) |
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return PTR_ERR(timer->rtc); |
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/* |
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* Set wakeup capability before requesting wakeup interrupt, so we can |
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* process boot-time "wakeups" (e.g., from S5 soft-off) |
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*/ |
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device_set_wakeup_capable(dev, true); |
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device_wakeup_enable(dev); |
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timer->irq = platform_get_irq(pdev, 0); |
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if (timer->irq < 0) |
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return -ENODEV; |
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timer->clk = devm_clk_get(dev, NULL); |
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if (!IS_ERR(timer->clk)) { |
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ret = clk_prepare_enable(timer->clk); |
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if (ret) |
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return ret; |
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timer->rate = clk_get_rate(timer->clk); |
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if (!timer->rate) |
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timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ; |
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} else { |
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timer->rate = BRCMSTB_WKTMR_DEFAULT_FREQ; |
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timer->clk = NULL; |
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} |
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ret = devm_request_irq(dev, timer->irq, brcmstb_waketmr_irq, 0, |
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"brcmstb-waketimer", timer); |
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if (ret < 0) |
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goto err_clk; |
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timer->reboot_notifier.notifier_call = brcmstb_waketmr_reboot; |
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register_reboot_notifier(&timer->reboot_notifier); |
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timer->rtc->ops = &brcmstb_waketmr_ops; |
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timer->rtc->range_max = U32_MAX; |
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ret = devm_rtc_register_device(timer->rtc); |
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if (ret) |
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goto err_notifier; |
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dev_info(dev, "registered, with irq %d\n", timer->irq); |
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return 0; |
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err_notifier: |
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unregister_reboot_notifier(&timer->reboot_notifier); |
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err_clk: |
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clk_disable_unprepare(timer->clk); |
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return ret; |
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} |
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static int brcmstb_waketmr_remove(struct platform_device *pdev) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(&pdev->dev); |
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unregister_reboot_notifier(&timer->reboot_notifier); |
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clk_disable_unprepare(timer->clk); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int brcmstb_waketmr_suspend(struct device *dev) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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return brcmstb_waketmr_prepare_suspend(timer); |
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} |
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static int brcmstb_waketmr_resume(struct device *dev) |
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{ |
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struct brcmstb_waketmr *timer = dev_get_drvdata(dev); |
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int ret; |
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if (!device_may_wakeup(dev)) |
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return 0; |
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ret = disable_irq_wake(timer->irq); |
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brcmstb_waketmr_clear_alarm(timer); |
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return ret; |
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} |
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#endif /* CONFIG_PM_SLEEP */ |
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static SIMPLE_DEV_PM_OPS(brcmstb_waketmr_pm_ops, |
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brcmstb_waketmr_suspend, brcmstb_waketmr_resume); |
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static const __maybe_unused struct of_device_id brcmstb_waketmr_of_match[] = { |
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{ .compatible = "brcm,brcmstb-waketimer" }, |
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{ /* sentinel */ }, |
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}; |
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static struct platform_driver brcmstb_waketmr_driver = { |
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.probe = brcmstb_waketmr_probe, |
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.remove = brcmstb_waketmr_remove, |
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.driver = { |
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.name = "brcmstb-waketimer", |
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.pm = &brcmstb_waketmr_pm_ops, |
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.of_match_table = of_match_ptr(brcmstb_waketmr_of_match), |
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} |
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}; |
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module_platform_driver(brcmstb_waketmr_driver); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_AUTHOR("Brian Norris"); |
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MODULE_AUTHOR("Markus Mayer"); |
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MODULE_DESCRIPTION("Wake-up timer driver for STB chips");
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