rtc: add Freescale stmp37xx/378x driver

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>

1 files changed, 304 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-stmp3xxx.c b/drivers/rtc/rtc-stmp3xxx.c
new file mode 100644
index 000000000000..d7ce1a5c857d
--- /dev/null
+++ b/drivers/rtc/rtc-stmp3xxx.c
@@ -0,0 +1,304 @@
+/*
+ * 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");