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