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216 lines
5.0 KiB
216 lines
5.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* drivers/rtc/rtc-goldfish.c |
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* |
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* Copyright (C) 2007 Google, Inc. |
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* Copyright (C) 2017 Imagination Technologies Ltd. |
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*/ |
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#include <linux/io.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/rtc.h> |
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#define TIMER_TIME_LOW 0x00 /* get low bits of current time */ |
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/* and update TIMER_TIME_HIGH */ |
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#define TIMER_TIME_HIGH 0x04 /* get high bits of time at last */ |
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/* TIMER_TIME_LOW read */ |
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#define TIMER_ALARM_LOW 0x08 /* set low bits of alarm and */ |
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/* activate it */ |
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#define TIMER_ALARM_HIGH 0x0c /* set high bits of next alarm */ |
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#define TIMER_IRQ_ENABLED 0x10 |
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#define TIMER_CLEAR_ALARM 0x14 |
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#define TIMER_ALARM_STATUS 0x18 |
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#define TIMER_CLEAR_INTERRUPT 0x1c |
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struct goldfish_rtc { |
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void __iomem *base; |
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int irq; |
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struct rtc_device *rtc; |
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}; |
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static int goldfish_rtc_read_alarm(struct device *dev, |
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struct rtc_wkalrm *alrm) |
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{ |
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u64 rtc_alarm; |
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u64 rtc_alarm_low; |
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u64 rtc_alarm_high; |
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void __iomem *base; |
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struct goldfish_rtc *rtcdrv; |
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rtcdrv = dev_get_drvdata(dev); |
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base = rtcdrv->base; |
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rtc_alarm_low = readl(base + TIMER_ALARM_LOW); |
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rtc_alarm_high = readl(base + TIMER_ALARM_HIGH); |
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rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low; |
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do_div(rtc_alarm, NSEC_PER_SEC); |
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memset(alrm, 0, sizeof(struct rtc_wkalrm)); |
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rtc_time64_to_tm(rtc_alarm, &alrm->time); |
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if (readl(base + TIMER_ALARM_STATUS)) |
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alrm->enabled = 1; |
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else |
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alrm->enabled = 0; |
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return 0; |
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} |
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static int goldfish_rtc_set_alarm(struct device *dev, |
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struct rtc_wkalrm *alrm) |
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{ |
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struct goldfish_rtc *rtcdrv; |
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u64 rtc_alarm64; |
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u64 rtc_status_reg; |
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void __iomem *base; |
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rtcdrv = dev_get_drvdata(dev); |
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base = rtcdrv->base; |
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if (alrm->enabled) { |
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rtc_alarm64 = rtc_tm_to_time64(&alrm->time) * NSEC_PER_SEC; |
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writel((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH); |
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writel(rtc_alarm64, base + TIMER_ALARM_LOW); |
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writel(1, base + TIMER_IRQ_ENABLED); |
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} else { |
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/* |
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* if this function was called with enabled=0 |
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* then it could mean that the application is |
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* trying to cancel an ongoing alarm |
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*/ |
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rtc_status_reg = readl(base + TIMER_ALARM_STATUS); |
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if (rtc_status_reg) |
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writel(1, base + TIMER_CLEAR_ALARM); |
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} |
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return 0; |
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} |
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static int goldfish_rtc_alarm_irq_enable(struct device *dev, |
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unsigned int enabled) |
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{ |
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void __iomem *base; |
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struct goldfish_rtc *rtcdrv; |
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rtcdrv = dev_get_drvdata(dev); |
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base = rtcdrv->base; |
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if (enabled) |
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writel(1, base + TIMER_IRQ_ENABLED); |
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else |
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writel(0, base + TIMER_IRQ_ENABLED); |
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return 0; |
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} |
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static irqreturn_t goldfish_rtc_interrupt(int irq, void *dev_id) |
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{ |
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struct goldfish_rtc *rtcdrv = dev_id; |
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void __iomem *base = rtcdrv->base; |
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writel(1, base + TIMER_CLEAR_INTERRUPT); |
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rtc_update_irq(rtcdrv->rtc, 1, RTC_IRQF | RTC_AF); |
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return IRQ_HANDLED; |
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} |
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static int goldfish_rtc_read_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct goldfish_rtc *rtcdrv; |
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void __iomem *base; |
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u64 time_high; |
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u64 time_low; |
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u64 time; |
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rtcdrv = dev_get_drvdata(dev); |
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base = rtcdrv->base; |
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time_low = readl(base + TIMER_TIME_LOW); |
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time_high = readl(base + TIMER_TIME_HIGH); |
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time = (time_high << 32) | time_low; |
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do_div(time, NSEC_PER_SEC); |
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rtc_time64_to_tm(time, tm); |
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return 0; |
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} |
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static int goldfish_rtc_set_time(struct device *dev, struct rtc_time *tm) |
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{ |
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struct goldfish_rtc *rtcdrv; |
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void __iomem *base; |
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u64 now64; |
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rtcdrv = dev_get_drvdata(dev); |
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base = rtcdrv->base; |
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now64 = rtc_tm_to_time64(tm) * NSEC_PER_SEC; |
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writel((now64 >> 32), base + TIMER_TIME_HIGH); |
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writel(now64, base + TIMER_TIME_LOW); |
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return 0; |
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} |
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static const struct rtc_class_ops goldfish_rtc_ops = { |
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.read_time = goldfish_rtc_read_time, |
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.set_time = goldfish_rtc_set_time, |
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.read_alarm = goldfish_rtc_read_alarm, |
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.set_alarm = goldfish_rtc_set_alarm, |
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.alarm_irq_enable = goldfish_rtc_alarm_irq_enable |
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}; |
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static int goldfish_rtc_probe(struct platform_device *pdev) |
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{ |
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struct goldfish_rtc *rtcdrv; |
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int err; |
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rtcdrv = devm_kzalloc(&pdev->dev, sizeof(*rtcdrv), GFP_KERNEL); |
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if (!rtcdrv) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, rtcdrv); |
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rtcdrv->base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(rtcdrv->base)) |
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return PTR_ERR(rtcdrv->base); |
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rtcdrv->irq = platform_get_irq(pdev, 0); |
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if (rtcdrv->irq < 0) |
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return -ENODEV; |
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rtcdrv->rtc = devm_rtc_allocate_device(&pdev->dev); |
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if (IS_ERR(rtcdrv->rtc)) |
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return PTR_ERR(rtcdrv->rtc); |
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rtcdrv->rtc->ops = &goldfish_rtc_ops; |
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rtcdrv->rtc->range_max = U64_MAX / NSEC_PER_SEC; |
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err = devm_request_irq(&pdev->dev, rtcdrv->irq, |
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goldfish_rtc_interrupt, |
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0, pdev->name, rtcdrv); |
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if (err) |
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return err; |
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return devm_rtc_register_device(rtcdrv->rtc); |
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} |
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static const struct of_device_id goldfish_rtc_of_match[] = { |
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{ .compatible = "google,goldfish-rtc", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, goldfish_rtc_of_match); |
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static struct platform_driver goldfish_rtc = { |
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.probe = goldfish_rtc_probe, |
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.driver = { |
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.name = "goldfish_rtc", |
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.of_match_table = goldfish_rtc_of_match, |
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} |
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}; |
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module_platform_driver(goldfish_rtc); |
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MODULE_LICENSE("GPL v2");
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