forked from luck/tmp_suning_uos_patched
df17f63173
Add support for RTC on the Freescale STMP37xx/378x platform. Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com> Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
305 lines
7.6 KiB
C
305 lines
7.6 KiB
C
/*
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* Freescale STMP37XX/STMP378X Real Time Clock driver
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*
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* Copyright (c) 2007 Sigmatel, Inc.
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* Peter Hartley, <peter.hartley@sigmatel.com>
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*
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* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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*/
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/*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/rtc.h>
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#include <mach/platform.h>
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#include <mach/stmp3xxx.h>
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#include <mach/regs-rtc.h>
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struct stmp3xxx_rtc_data {
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struct rtc_device *rtc;
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unsigned irq_count;
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void __iomem *io;
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int irq_alarm, irq_1msec;
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};
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static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
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{
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/*
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* The datasheet doesn't say which way round the
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* NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
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* 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
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*/
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while (__raw_readl(rtc_data->io + HW_RTC_STAT) &
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BF(0x80, RTC_STAT_STALE_REGS))
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cpu_relax();
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}
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/* Time read/write */
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static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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stmp3xxx_wait_time(rtc_data);
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rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_SECONDS), rtc_tm);
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return 0;
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}
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static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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__raw_writel(t, rtc_data->io + HW_RTC_SECONDS);
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stmp3xxx_wait_time(rtc_data);
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return 0;
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}
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/* interrupt(s) handler */
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static irqreturn_t stmp3xxx_rtc_interrupt(int irq, void *dev_id)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev_id);
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u32 status;
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u32 events = 0;
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status = __raw_readl(rtc_data->io + HW_RTC_CTRL) &
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(BM_RTC_CTRL_ALARM_IRQ | BM_RTC_CTRL_ONEMSEC_IRQ);
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if (status & BM_RTC_CTRL_ALARM_IRQ) {
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stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ,
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rtc_data->io + HW_RTC_CTRL);
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events |= RTC_AF | RTC_IRQF;
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}
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if (status & BM_RTC_CTRL_ONEMSEC_IRQ) {
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ,
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rtc_data->io + HW_RTC_CTRL);
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if (++rtc_data->irq_count % 1000 == 0) {
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events |= RTC_UF | RTC_IRQF;
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rtc_data->irq_count = 0;
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}
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}
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if (events)
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rtc_update_irq(rtc_data->rtc, 1, events);
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return IRQ_HANDLED;
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}
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static int stmp3xxx_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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void __iomem *p = rtc_data->io + HW_RTC_PERSISTENT0,
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*ctl = rtc_data->io + HW_RTC_CTRL;
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if (enabled) {
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stmp3xxx_setl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
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stmp3xxx_setl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
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} else {
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN, p);
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stmp3xxx_clearl(BM_RTC_CTRL_ALARM_IRQ_EN, ctl);
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}
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return 0;
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}
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static int stmp3xxx_update_irq_enable(struct device *dev, unsigned int enabled)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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if (enabled)
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stmp3xxx_setl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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else
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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return 0;
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}
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static int stmp3xxx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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rtc_time_to_tm(__raw_readl(rtc_data->io + HW_RTC_ALARM), &alm->time);
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return 0;
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}
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static int stmp3xxx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
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{
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unsigned long t;
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struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
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rtc_tm_to_time(&alm->time, &t);
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__raw_writel(t, rtc_data->io + HW_RTC_ALARM);
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return 0;
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}
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static struct rtc_class_ops stmp3xxx_rtc_ops = {
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.alarm_irq_enable =
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stmp3xxx_alarm_irq_enable,
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.update_irq_enable =
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stmp3xxx_update_irq_enable,
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.read_time = stmp3xxx_rtc_gettime,
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.set_mmss = stmp3xxx_rtc_set_mmss,
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.read_alarm = stmp3xxx_rtc_read_alarm,
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.set_alarm = stmp3xxx_rtc_set_alarm,
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};
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static int stmp3xxx_rtc_remove(struct platform_device *pdev)
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{
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struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(pdev);
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if (!rtc_data)
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return 0;
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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free_irq(rtc_data->irq_alarm, &pdev->dev);
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free_irq(rtc_data->irq_1msec, &pdev->dev);
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rtc_device_unregister(rtc_data->rtc);
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iounmap(rtc_data->io);
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kfree(rtc_data);
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return 0;
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}
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static int stmp3xxx_rtc_probe(struct platform_device *pdev)
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{
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struct stmp3xxx_rtc_data *rtc_data;
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struct resource *r;
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int err;
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rtc_data = kzalloc(sizeof *rtc_data, GFP_KERNEL);
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if (!rtc_data)
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return -ENOMEM;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!r) {
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dev_err(&pdev->dev, "failed to get resource\n");
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err = -ENXIO;
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goto out_free;
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}
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rtc_data->io = ioremap(r->start, resource_size(r));
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if (!rtc_data->io) {
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dev_err(&pdev->dev, "ioremap failed\n");
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err = -EIO;
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goto out_free;
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}
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rtc_data->irq_alarm = platform_get_irq(pdev, 0);
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rtc_data->irq_1msec = platform_get_irq(pdev, 1);
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if (!(__raw_readl(HW_RTC_STAT + rtc_data->io) &
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BM_RTC_STAT_RTC_PRESENT)) {
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dev_err(&pdev->dev, "no device onboard\n");
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err = -ENODEV;
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goto out_remap;
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}
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stmp3xxx_reset_block(rtc_data->io, true);
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE,
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rtc_data->io + HW_RTC_PERSISTENT0);
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rtc_data->rtc = rtc_device_register(pdev->name, &pdev->dev,
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&stmp3xxx_rtc_ops, THIS_MODULE);
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if (IS_ERR(rtc_data->rtc)) {
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err = PTR_ERR(rtc_data->rtc);
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goto out_remap;
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}
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rtc_data->irq_count = 0;
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err = request_irq(rtc_data->irq_alarm, stmp3xxx_rtc_interrupt,
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IRQF_DISABLED, "RTC alarm", &pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
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rtc_data->irq_alarm);
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goto out_irq_alarm;
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}
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err = request_irq(rtc_data->irq_1msec, stmp3xxx_rtc_interrupt,
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IRQF_DISABLED, "RTC tick", &pdev->dev);
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if (err) {
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dev_err(&pdev->dev, "Cannot claim IRQ%d\n",
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rtc_data->irq_1msec);
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goto out_irq1;
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}
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platform_set_drvdata(pdev, rtc_data);
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return 0;
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out_irq1:
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free_irq(rtc_data->irq_alarm, &pdev->dev);
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out_irq_alarm:
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stmp3xxx_clearl(BM_RTC_CTRL_ONEMSEC_IRQ_EN | BM_RTC_CTRL_ALARM_IRQ_EN,
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rtc_data->io + HW_RTC_CTRL);
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rtc_device_unregister(rtc_data->rtc);
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out_remap:
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iounmap(rtc_data->io);
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out_free:
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kfree(rtc_data);
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return err;
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}
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#ifdef CONFIG_PM
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static int stmp3xxx_rtc_suspend(struct platform_device *dev, pm_message_t state)
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{
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return 0;
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}
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static int stmp3xxx_rtc_resume(struct platform_device *dev)
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{
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struct stmp3xxx_rtc_data *rtc_data = platform_get_drvdata(dev);
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stmp3xxx_reset_block(rtc_data->io, true);
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stmp3xxx_clearl(BM_RTC_PERSISTENT0_ALARM_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE_EN |
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BM_RTC_PERSISTENT0_ALARM_WAKE,
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rtc_data->io + HW_RTC_PERSISTENT0);
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return 0;
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}
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#else
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#define stmp3xxx_rtc_suspend NULL
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#define stmp3xxx_rtc_resume NULL
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#endif
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static struct platform_driver stmp3xxx_rtcdrv = {
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.probe = stmp3xxx_rtc_probe,
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.remove = stmp3xxx_rtc_remove,
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.suspend = stmp3xxx_rtc_suspend,
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.resume = stmp3xxx_rtc_resume,
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.driver = {
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.name = "stmp3xxx-rtc",
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.owner = THIS_MODULE,
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},
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};
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static int __init stmp3xxx_rtc_init(void)
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{
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return platform_driver_register(&stmp3xxx_rtcdrv);
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}
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static void __exit stmp3xxx_rtc_exit(void)
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{
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platform_driver_unregister(&stmp3xxx_rtcdrv);
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}
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module_init(stmp3xxx_rtc_init);
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module_exit(stmp3xxx_rtc_exit);
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MODULE_DESCRIPTION("STMP3xxx RTC Driver");
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MODULE_AUTHOR("dmitry pervushin <dpervushin@embeddedalley.com>");
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MODULE_LICENSE("GPL");
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