rtc: PCF50633 rtc driver

Signed-off-by: Balaji Rao <balajirrao@openmoko.org>
Cc: Andy Green <andy@openmoko.com>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Cc: Paul Gortmaker <a.zummo@towertech.it>
Cc: rtc-linux@googlegroups.com
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

3 files changed, 352 insertions, 0 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 4ad831de41ad..cced4d108319 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -502,6 +502,13 @@ config RTC_DRV_WM8350
           This driver can also be built as a module. If so, the module
           will be called "rtc-wm8350".
 
+config RTC_DRV_PCF50633
+        depends on MFD_PCF50633
+        tristate "NXP PCF50633 RTC"
+        help
+          If you say yes here you get support for the RTC subsystem of the
+          NXP PCF50633 used in embedded systems.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_OMAP
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 9a4340d48f26..6e28021abb9d 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -74,3 +74,4 @@ obj-$(CONFIG_RTC_DRV_V3020)	+= rtc-v3020.o
 obj-$(CONFIG_RTC_DRV_VR41XX)    += rtc-vr41xx.o
 obj-$(CONFIG_RTC_DRV_WM8350)    += rtc-wm8350.o
 obj-$(CONFIG_RTC_DRV_X1205)     += rtc-x1205.o
+obj-$(CONFIG_RTC_DRV_PCF50633)  += rtc-pcf50633.o
diff --git a/drivers/rtc/rtc-pcf50633.c b/drivers/rtc/rtc-pcf50633.c
new file mode 100644
index 000000000000..f4dd87e29075
--- /dev/null
+++ b/drivers/rtc/rtc-pcf50633.c
@@ -0,0 +1,344 @@
+/* NXP PCF50633 RTC Driver
+ *
+ * (C) 2006-2008 by Openmoko, Inc.
+ * Author: Balaji Rao <balajirrao@openmoko.org>
+ * All rights reserved.
+ *
+ * Broken down from monstrous PCF50633 driver mainly by
+ * Harald Welte, Andy Green and Werner Almesberger
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/err.h>
+
+#include <linux/mfd/pcf50633/core.h>
+
+#define PCF50633_REG_RTCSC      0x59 /* Second */
+#define PCF50633_REG_RTCMN      0x5a /* Minute */
+#define PCF50633_REG_RTCHR      0x5b /* Hour */
+#define PCF50633_REG_RTCWD      0x5c /* Weekday */
+#define PCF50633_REG_RTCDT      0x5d /* Day */
+#define PCF50633_REG_RTCMT      0x5e /* Month */
+#define PCF50633_REG_RTCYR      0x5f /* Year */
+#define PCF50633_REG_RTCSCA     0x60 /* Alarm Second */
+#define PCF50633_REG_RTCMNA     0x61 /* Alarm Minute */
+#define PCF50633_REG_RTCHRA     0x62 /* Alarm Hour */
+#define PCF50633_REG_RTCWDA     0x63 /* Alarm Weekday */
+#define PCF50633_REG_RTCDTA     0x64 /* Alarm Day */
+#define PCF50633_REG_RTCMTA     0x65 /* Alarm Month */
+#define PCF50633_REG_RTCYRA     0x66 /* Alarm Year */
+
+enum pcf50633_time_indexes {
+        PCF50633_TI_SEC,
+        PCF50633_TI_MIN,
+        PCF50633_TI_HOUR,
+        PCF50633_TI_WKDAY,
+        PCF50633_TI_DAY,
+        PCF50633_TI_MONTH,
+        PCF50633_TI_YEAR,
+        PCF50633_TI_EXTENT /* always last */
+};
+
+struct pcf50633_time {
+        u_int8_t time[PCF50633_TI_EXTENT];
+};
+
+struct pcf50633_rtc {
+        int alarm_enabled;
+        int second_enabled;
+
+        struct pcf50633 *pcf;
+        struct rtc_device *rtc_dev;
+};
+
+static void pcf2rtc_time(struct rtc_time *rtc, struct pcf50633_time *pcf)
+{
+        rtc->tm_sec = bcd2bin(pcf->time[PCF50633_TI_SEC]);
+        rtc->tm_min = bcd2bin(pcf->time[PCF50633_TI_MIN]);
+        rtc->tm_hour = bcd2bin(pcf->time[PCF50633_TI_HOUR]);
+        rtc->tm_wday = bcd2bin(pcf->time[PCF50633_TI_WKDAY]);
+        rtc->tm_mday = bcd2bin(pcf->time[PCF50633_TI_DAY]);
+        rtc->tm_mon = bcd2bin(pcf->time[PCF50633_TI_MONTH]);
+        rtc->tm_year = bcd2bin(pcf->time[PCF50633_TI_YEAR]) + 100;
+}
+
+static void rtc2pcf_time(struct pcf50633_time *pcf, struct rtc_time *rtc)
+{
+        pcf->time[PCF50633_TI_SEC] = bin2bcd(rtc->tm_sec);
+        pcf->time[PCF50633_TI_MIN] = bin2bcd(rtc->tm_min);
+        pcf->time[PCF50633_TI_HOUR] = bin2bcd(rtc->tm_hour);
+        pcf->time[PCF50633_TI_WKDAY] = bin2bcd(rtc->tm_wday);
+        pcf->time[PCF50633_TI_DAY] = bin2bcd(rtc->tm_mday);
+        pcf->time[PCF50633_TI_MONTH] = bin2bcd(rtc->tm_mon);
+        pcf->time[PCF50633_TI_YEAR] = bin2bcd(rtc->tm_year % 100);
+}
+
+static int
+pcf50633_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+        struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
+        int err;
+
+        if (enabled)
+                err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+        else
+                err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        if (err < 0)
+                return err;
+
+        rtc->alarm_enabled = enabled;
+
+        return 0;
+}
+
+static int
+pcf50633_rtc_update_irq_enable(struct device *dev, unsigned int enabled)
+{
+        struct pcf50633_rtc *rtc = dev_get_drvdata(dev);
+        int err;
+
+        if (enabled)
+                err = pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
+        else
+                err = pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
+
+        if (err < 0)
+                return err;
+
+        rtc->second_enabled = enabled;
+
+        return 0;
+}
+
+static int pcf50633_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        struct pcf50633_rtc *rtc;
+        struct pcf50633_time pcf_tm;
+        int ret;
+
+        rtc = dev_get_drvdata(dev);
+
+        ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSC,
+                                            PCF50633_TI_EXTENT,
+                                            &pcf_tm.time[0]);
+        if (ret != PCF50633_TI_EXTENT) {
+                dev_err(dev, "Failed to read time\n");
+                return -EIO;
+        }
+
+        dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+                pcf_tm.time[PCF50633_TI_DAY],
+                pcf_tm.time[PCF50633_TI_MONTH],
+                pcf_tm.time[PCF50633_TI_YEAR],
+                pcf_tm.time[PCF50633_TI_HOUR],
+                pcf_tm.time[PCF50633_TI_MIN],
+                pcf_tm.time[PCF50633_TI_SEC]);
+
+        pcf2rtc_time(tm, &pcf_tm);
+
+        dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
+                tm->tm_mday, tm->tm_mon, tm->tm_year,
+                tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+        return rtc_valid_tm(tm);
+}
+
+static int pcf50633_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        struct pcf50633_rtc *rtc;
+        struct pcf50633_time pcf_tm;
+        int second_masked, alarm_masked, ret = 0;
+
+        rtc = dev_get_drvdata(dev);
+
+        dev_dbg(dev, "RTC_TIME: %u.%u.%u %u:%u:%u\n",
+                tm->tm_mday, tm->tm_mon, tm->tm_year,
+                tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+        rtc2pcf_time(&pcf_tm, tm);
+
+        dev_dbg(dev, "PCF_TIME: %02x.%02x.%02x %02x:%02x:%02x\n",
+                pcf_tm.time[PCF50633_TI_DAY],
+                pcf_tm.time[PCF50633_TI_MONTH],
+                pcf_tm.time[PCF50633_TI_YEAR],
+                pcf_tm.time[PCF50633_TI_HOUR],
+                pcf_tm.time[PCF50633_TI_MIN],
+                pcf_tm.time[PCF50633_TI_SEC]);
+
+
+        second_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_SECOND);
+        alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        if (!second_masked)
+                pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_SECOND);
+        if (!alarm_masked)
+                pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        /* Returns 0 on success */
+        ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSC,
+                                             PCF50633_TI_EXTENT,
+                                             &pcf_tm.time[0]);
+
+        if (!second_masked)
+                pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_SECOND);
+        if (!alarm_masked)
+                pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        return ret;
+}
+
+static int pcf50633_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct pcf50633_rtc *rtc;
+        struct pcf50633_time pcf_tm;
+        int ret = 0;
+
+        rtc = dev_get_drvdata(dev);
+
+        alrm->enabled = rtc->alarm_enabled;
+
+        ret = pcf50633_read_block(rtc->pcf, PCF50633_REG_RTCSCA,
+                                PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+        if (ret != PCF50633_TI_EXTENT) {
+                dev_err(dev, "Failed to read time\n");
+                return -EIO;
+        }
+
+        pcf2rtc_time(&alrm->time, &pcf_tm);
+
+        return rtc_valid_tm(&alrm->time);
+}
+
+static int pcf50633_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct pcf50633_rtc *rtc;
+        struct pcf50633_time pcf_tm;
+        int alarm_masked, ret = 0;
+
+        rtc = dev_get_drvdata(dev);
+
+        rtc2pcf_time(&pcf_tm, &alrm->time);
+
+        /* do like mktime does and ignore tm_wday */
+        pcf_tm.time[PCF50633_TI_WKDAY] = 7;
+
+        alarm_masked = pcf50633_irq_mask_get(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        /* disable alarm interrupt */
+        if (!alarm_masked)
+                pcf50633_irq_mask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        /* Returns 0 on success */
+        ret = pcf50633_write_block(rtc->pcf, PCF50633_REG_RTCSCA,
+                                PCF50633_TI_EXTENT, &pcf_tm.time[0]);
+
+        if (!alarm_masked)
+                pcf50633_irq_unmask(rtc->pcf, PCF50633_IRQ_ALARM);
+
+        return ret;
+}
+
+static struct rtc_class_ops pcf50633_rtc_ops = {
+        .read_time              = pcf50633_rtc_read_time,
+        .set_time               = pcf50633_rtc_set_time,
+        .read_alarm             = pcf50633_rtc_read_alarm,
+        .set_alarm              = pcf50633_rtc_set_alarm,
+        .alarm_irq_enable       = pcf50633_rtc_alarm_irq_enable,
+        .update_irq_enable      = pcf50633_rtc_update_irq_enable,
+};
+
+static void pcf50633_rtc_irq(int irq, void *data)
+{
+        struct pcf50633_rtc *rtc = data;
+
+        switch (irq) {
+        case PCF50633_IRQ_ALARM:
+                rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF);
+                break;
+        case PCF50633_IRQ_SECOND:
+                rtc_update_irq(rtc->rtc_dev, 1, RTC_UF | RTC_IRQF);
+                break;
+        }
+}
+
+static int __devinit pcf50633_rtc_probe(struct platform_device *pdev)
+{
+        struct pcf50633_subdev_pdata *pdata;
+        struct pcf50633_rtc *rtc;
+
+
+        rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+        if (!rtc)
+                return -ENOMEM;
+
+        pdata = pdev->dev.platform_data;
+        rtc->pcf = pdata->pcf;
+        platform_set_drvdata(pdev, rtc);
+        rtc->rtc_dev = rtc_device_register("pcf50633-rtc", &pdev->dev,
+                                &pcf50633_rtc_ops, THIS_MODULE);
+
+        if (IS_ERR(rtc->rtc_dev)) {
+                kfree(rtc);
+                return PTR_ERR(rtc->rtc_dev);
+        }
+
+        pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_ALARM,
+                                        pcf50633_rtc_irq, rtc);
+        pcf50633_register_irq(rtc->pcf, PCF50633_IRQ_SECOND,
+                                        pcf50633_rtc_irq, rtc);
+
+        return 0;
+}
+
+static int __devexit pcf50633_rtc_remove(struct platform_device *pdev)
+{
+        struct pcf50633_rtc *rtc;
+
+        rtc = platform_get_drvdata(pdev);
+
+        pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_ALARM);
+        pcf50633_free_irq(rtc->pcf, PCF50633_IRQ_SECOND);
+
+        rtc_device_unregister(rtc->rtc_dev);
+        kfree(rtc);
+
+        return 0;
+}
+
+static struct platform_driver pcf50633_rtc_driver = {
+        .driver = {
+                .name = "pcf50633-rtc",
+        },
+        .probe = pcf50633_rtc_probe,
+        .remove = __devexit_p(pcf50633_rtc_remove),
+};
+
+static int __init pcf50633_rtc_init(void)
+{
+        return platform_driver_register(&pcf50633_rtc_driver);
+}
+module_init(pcf50633_rtc_init);
+
+static void __exit pcf50633_rtc_exit(void)
+{
+        platform_driver_unregister(&pcf50633_rtc_driver);
+}
+module_exit(pcf50633_rtc_exit);
+
+MODULE_DESCRIPTION("PCF50633 RTC driver");
+MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
+MODULE_LICENSE("GPL");
+