188 lines
3.8 KiB
C
188 lines
3.8 KiB
C
/*
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* linux/drivers/rtc/rtc-pl030.c
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*
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* Copyright (C) 2000-2001 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/amba/bus.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#define RTC_DR (0)
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#define RTC_MR (4)
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#define RTC_STAT (8)
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#define RTC_EOI (8)
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#define RTC_LR (12)
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#define RTC_CR (16)
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#define RTC_CR_MIE (1 << 0)
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struct pl030_rtc {
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struct rtc_device *rtc;
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void __iomem *base;
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};
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static irqreturn_t pl030_interrupt(int irq, void *dev_id)
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{
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struct pl030_rtc *rtc = dev_id;
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writel(0, rtc->base + RTC_EOI);
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return IRQ_HANDLED;
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}
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static int pl030_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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rtc_time_to_tm(readl(rtc->base + RTC_MR), &alrm->time);
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return 0;
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}
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static int pl030_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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unsigned long time;
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int ret;
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/*
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* At the moment, we can only deal with non-wildcarded alarm times.
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*/
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ret = rtc_valid_tm(&alrm->time);
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if (ret == 0)
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ret = rtc_tm_to_time(&alrm->time, &time);
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if (ret == 0)
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writel(time, rtc->base + RTC_MR);
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return ret;
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}
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static int pl030_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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rtc_time_to_tm(readl(rtc->base + RTC_DR), tm);
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return 0;
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}
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/*
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* Set the RTC time. Unfortunately, we can't accurately set
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* the point at which the counter updates.
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*
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* Also, since RTC_LR is transferred to RTC_CR on next rising
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* edge of the 1Hz clock, we must write the time one second
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* in advance.
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*/
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static int pl030_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct pl030_rtc *rtc = dev_get_drvdata(dev);
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unsigned long time;
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int ret;
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ret = rtc_tm_to_time(tm, &time);
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if (ret == 0)
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writel(time + 1, rtc->base + RTC_LR);
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return ret;
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}
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static const struct rtc_class_ops pl030_ops = {
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.read_time = pl030_read_time,
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.set_time = pl030_set_time,
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.read_alarm = pl030_read_alarm,
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.set_alarm = pl030_set_alarm,
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};
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static int pl030_probe(struct amba_device *dev, const struct amba_id *id)
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{
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struct pl030_rtc *rtc;
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int ret;
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ret = amba_request_regions(dev, NULL);
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if (ret)
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goto err_req;
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rtc = devm_kzalloc(&dev->dev, sizeof(*rtc), GFP_KERNEL);
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if (!rtc) {
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ret = -ENOMEM;
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goto err_rtc;
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}
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rtc->base = ioremap(dev->res.start, resource_size(&dev->res));
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if (!rtc->base) {
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ret = -ENOMEM;
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goto err_rtc;
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}
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__raw_writel(0, rtc->base + RTC_CR);
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__raw_writel(0, rtc->base + RTC_EOI);
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amba_set_drvdata(dev, rtc);
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ret = request_irq(dev->irq[0], pl030_interrupt, 0,
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"rtc-pl030", rtc);
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if (ret)
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goto err_irq;
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rtc->rtc = rtc_device_register("pl030", &dev->dev, &pl030_ops,
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THIS_MODULE);
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if (IS_ERR(rtc->rtc)) {
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ret = PTR_ERR(rtc->rtc);
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goto err_reg;
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}
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return 0;
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err_reg:
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free_irq(dev->irq[0], rtc);
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err_irq:
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iounmap(rtc->base);
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err_rtc:
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amba_release_regions(dev);
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err_req:
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return ret;
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}
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static int pl030_remove(struct amba_device *dev)
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{
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struct pl030_rtc *rtc = amba_get_drvdata(dev);
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writel(0, rtc->base + RTC_CR);
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free_irq(dev->irq[0], rtc);
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rtc_device_unregister(rtc->rtc);
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iounmap(rtc->base);
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amba_release_regions(dev);
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return 0;
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}
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static struct amba_id pl030_ids[] = {
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{
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.id = 0x00041030,
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.mask = 0x000fffff,
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},
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{ 0, 0 },
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};
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MODULE_DEVICE_TABLE(amba, pl030_ids);
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static struct amba_driver pl030_driver = {
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.drv = {
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.name = "rtc-pl030",
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},
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.probe = pl030_probe,
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.remove = pl030_remove,
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.id_table = pl030_ids,
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};
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module_amba_driver(pl030_driver);
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MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
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MODULE_DESCRIPTION("ARM AMBA PL030 RTC Driver");
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MODULE_LICENSE("GPL");
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