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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208// SPDX-License-Identifier: GPL-2.0/* drivers/rtc/rtc-goldfish.c * * Copyright (C) 2007 Google, Inc. * Copyright (C) 2017 Imagination Technologies Ltd. */
#include <linux/io.h>#include <linux/module.h>#include <linux/of.h>#include <linux/platform_device.h>#include <linux/rtc.h>#include <linux/goldfish.h>#include <clocksource/timer-goldfish.h>
struct goldfish_rtc { void __iomem *base; int irq; struct rtc_device *rtc;};
static int goldfish_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm){ u64 rtc_alarm; u64 rtc_alarm_low; u64 rtc_alarm_high; void __iomem *base; struct goldfish_rtc *rtcdrv;
rtcdrv = dev_get_drvdata(dev); base = rtcdrv->base;
rtc_alarm_low = gf_ioread32(base + TIMER_ALARM_LOW); rtc_alarm_high = gf_ioread32(base + TIMER_ALARM_HIGH); rtc_alarm = (rtc_alarm_high << 32) | rtc_alarm_low;
do_div(rtc_alarm, NSEC_PER_SEC); memset(alrm, 0, sizeof(struct rtc_wkalrm));
rtc_time64_to_tm(rtc_alarm, &alrm->time);
if (gf_ioread32(base + TIMER_ALARM_STATUS)) alrm->enabled = 1; else alrm->enabled = 0;
return 0;}
static int goldfish_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm){ struct goldfish_rtc *rtcdrv; u64 rtc_alarm64; u64 rtc_status_reg; void __iomem *base;
rtcdrv = dev_get_drvdata(dev); base = rtcdrv->base;
if (alrm->enabled) { rtc_alarm64 = rtc_tm_to_time64(&alrm->time) * NSEC_PER_SEC; gf_iowrite32((rtc_alarm64 >> 32), base + TIMER_ALARM_HIGH); gf_iowrite32(rtc_alarm64, base + TIMER_ALARM_LOW); gf_iowrite32(1, base + TIMER_IRQ_ENABLED); } else { /* * if this function was called with enabled=0 * then it could mean that the application is * trying to cancel an ongoing alarm */ rtc_status_reg = gf_ioread32(base + TIMER_ALARM_STATUS); if (rtc_status_reg) gf_iowrite32(1, base + TIMER_CLEAR_ALARM); }
return 0;}
static int goldfish_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled){ void __iomem *base; struct goldfish_rtc *rtcdrv;
rtcdrv = dev_get_drvdata(dev); base = rtcdrv->base;
if (enabled) gf_iowrite32(1, base + TIMER_IRQ_ENABLED); else gf_iowrite32(0, base + TIMER_IRQ_ENABLED);
return 0;}
static irqreturn_t goldfish_rtc_interrupt(int irq, void *dev_id){ struct goldfish_rtc *rtcdrv = dev_id; void __iomem *base = rtcdrv->base;
gf_iowrite32(1, base + TIMER_CLEAR_INTERRUPT);
rtc_update_irq(rtcdrv->rtc, 1, RTC_IRQF | RTC_AF);
return IRQ_HANDLED;}
static int goldfish_rtc_read_time(struct device *dev, struct rtc_time *tm){ struct goldfish_rtc *rtcdrv; void __iomem *base; u64 time_high; u64 time_low; u64 time;
rtcdrv = dev_get_drvdata(dev); base = rtcdrv->base;
time_low = gf_ioread32(base + TIMER_TIME_LOW); time_high = gf_ioread32(base + TIMER_TIME_HIGH); time = (time_high << 32) | time_low;
do_div(time, NSEC_PER_SEC);
rtc_time64_to_tm(time, tm);
return 0;}
static int goldfish_rtc_set_time(struct device *dev, struct rtc_time *tm){ struct goldfish_rtc *rtcdrv; void __iomem *base; u64 now64;
rtcdrv = dev_get_drvdata(dev); base = rtcdrv->base;
now64 = rtc_tm_to_time64(tm) * NSEC_PER_SEC; gf_iowrite32((now64 >> 32), base + TIMER_TIME_HIGH); gf_iowrite32(now64, base + TIMER_TIME_LOW);
return 0;}
static const struct rtc_class_ops goldfish_rtc_ops = { .read_time = goldfish_rtc_read_time, .set_time = goldfish_rtc_set_time, .read_alarm = goldfish_rtc_read_alarm, .set_alarm = goldfish_rtc_set_alarm, .alarm_irq_enable = goldfish_rtc_alarm_irq_enable};
static int goldfish_rtc_probe(struct platform_device *pdev){ struct goldfish_rtc *rtcdrv; int err;
rtcdrv = devm_kzalloc(&pdev->dev, sizeof(*rtcdrv), GFP_KERNEL); if (!rtcdrv) return -ENOMEM;
platform_set_drvdata(pdev, rtcdrv); rtcdrv->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(rtcdrv->base)) return PTR_ERR(rtcdrv->base);
rtcdrv->irq = platform_get_irq(pdev, 0); if (rtcdrv->irq < 0) return -ENODEV;
rtcdrv->rtc = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtcdrv->rtc)) return PTR_ERR(rtcdrv->rtc);
rtcdrv->rtc->ops = &goldfish_rtc_ops; rtcdrv->rtc->range_max = U64_MAX / NSEC_PER_SEC;
err = devm_request_irq(&pdev->dev, rtcdrv->irq, goldfish_rtc_interrupt, 0, pdev->name, rtcdrv); if (err) return err;
return devm_rtc_register_device(rtcdrv->rtc);}
static const struct of_device_id goldfish_rtc_of_match[] = { { .compatible = "google,goldfish-rtc", }, {},};MODULE_DEVICE_TABLE(of, goldfish_rtc_of_match);
static struct platform_driver goldfish_rtc = { .probe = goldfish_rtc_probe, .driver = { .name = "goldfish_rtc", .of_match_table = goldfish_rtc_of_match, }};
module_platform_driver(goldfish_rtc);
MODULE_DESCRIPTION("Android Goldfish Real Time Clock driver");MODULE_LICENSE("GPL v2");