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