[PATCH 3/4] rtc: add rtc support to 88PM80X PMIC
Qiao Zhou
zhouqiao at marvell.com
Wed Jul 4 04:55:14 EDT 2012
add rtc driver for MARVELL 88PM80X PMIC and enable rtc function.
Signed-off-by: Qiao Zhou <zhouqiao at marvell.com>
---
drivers/rtc/Kconfig | 10 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-88pm80x.c | 366 +++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 377 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-88pm80x.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 08cbdb9..f3b49f8 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -135,6 +135,16 @@ config RTC_DRV_88PM860X
This driver can also be built as a module. If so, the module
will be called rtc-88pm860x.
+config RTC_DRV_88PM80X
+ tristate "Marvell 88PM80x"
+ depends on RTC_CLASS && I2C && MFD_88PM80X
+ help
+ If you say yes here you get support for RTC function in Marvell
+ 88PM80x chips.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-88pm80x.
+
config RTC_DRV_DS1307
tristate "Dallas/Maxim DS1307/37/38/39/40, ST M41T00, EPSON RX-8025"
help
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 2973921..0d5b2b6 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -16,6 +16,7 @@ rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
# Keep the list ordered.
obj-$(CONFIG_RTC_DRV_88PM860X) += rtc-88pm860x.o
+obj-$(CONFIG_RTC_DRV_88PM80X) += rtc-88pm80x.o
obj-$(CONFIG_RTC_DRV_AB3100) += rtc-ab3100.o
obj-$(CONFIG_RTC_DRV_AB8500) += rtc-ab8500.o
obj-$(CONFIG_RTC_DRV_AT32AP700X)+= rtc-at32ap700x.o
diff --git a/drivers/rtc/rtc-88pm80x.c b/drivers/rtc/rtc-88pm80x.c
new file mode 100644
index 0000000..4cabb40
--- /dev/null
+++ b/drivers/rtc/rtc-88pm80x.c
@@ -0,0 +1,366 @@
+/*
+ * Real Time Clock driver for Marvell 88PM80x PMIC
+ *
+ * Copyright (c) 2012 Marvell International Ltd.
+ * Wenzeng Chen<wzch at marvell.com>
+ * Qiao Zhou <zhouqiao at marvell.com>
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License. See the file "COPYING" in the main directory of this
+ * archive for more details.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/88pm80x.h>
+#include <linux/rtc.h>
+
+struct pm80x_rtc_info {
+ struct pm80x_chip *chip;
+ struct regmap *map;
+ struct rtc_device *rtc_dev;
+ struct device *dev;
+ struct delayed_work calib_work;
+
+ int irq;
+ int vrtc;
+};
+
+static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm);
+
+static irqreturn_t rtc_update_handler(int irq, void *data)
+{
+ struct pm80x_rtc_info *info = (struct pm80x_rtc_info *)data;
+ int mask;
+
+ mask = PM800_ALARM | PM800_ALARM_WAKEUP;
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL, mask | PM800_ALARM1_EN,
+ mask);
+ rtc_update_irq(info->rtc_dev, 1, RTC_AF);
+ return IRQ_HANDLED;
+}
+
+static int pm80x_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct pm80x_rtc_info *info = dev_get_drvdata(dev);
+
+ if (enabled)
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL,
+ PM800_ALARM1_EN, PM800_ALARM1_EN);
+ else
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL,
+ PM800_ALARM1_EN, 0);
+ return 0;
+}
+
+/*
+ * Calculate the next alarm time given the requested alarm time mask
+ * and the current time.
+ */
+static void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now,
+ struct rtc_time *alrm)
+{
+ unsigned long next_time;
+ unsigned long now_time;
+
+ next->tm_year = now->tm_year;
+ next->tm_mon = now->tm_mon;
+ next->tm_mday = now->tm_mday;
+ next->tm_hour = alrm->tm_hour;
+ next->tm_min = alrm->tm_min;
+ next->tm_sec = alrm->tm_sec;
+
+ rtc_tm_to_time(now, &now_time);
+ rtc_tm_to_time(next, &next_time);
+
+ if (next_time < now_time) {
+ /* Advance one day */
+ next_time += 60 * 60 * 24;
+ rtc_time_to_tm(next_time, next);
+ }
+}
+
+static int pm80x_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct pm80x_rtc_info *info = dev_get_drvdata(dev);
+ unsigned char buf[4];
+ unsigned long ticks, base, data;
+ pm80x_bulk_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+ base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
+
+ /* load 32-bit read-only counter */
+ pm80x_bulk_read(info->map, PM800_RTC_COUNTER1, buf, 4);
+ data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ ticks = base + data;
+ dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
+ base, data, ticks);
+ rtc_time_to_tm(ticks, tm);
+ return 0;
+}
+
+static int pm80x_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct pm80x_rtc_info *info = dev_get_drvdata(dev);
+ unsigned char buf[4];
+ unsigned long ticks, base, data;
+ if ((tm->tm_year < 70) || (tm->tm_year > 138)) {
+ dev_dbg(info->dev,
+ "Set time %d out of range. Please set time between 1970 to 2038.\n",
+ 1900 + tm->tm_year);
+ return -EINVAL;
+ }
+ rtc_tm_to_time(tm, &ticks);
+
+ /* load 32-bit read-only counter */
+ pm80x_bulk_read(info->map, PM800_RTC_COUNTER1, buf, 4);
+ data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ base = ticks - data;
+ dev_dbg(info->dev, "set base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
+ base, data, ticks);
+ buf[0] = base & 0xFF;
+ buf[1] = (base >> 8) & 0xFF;
+ buf[2] = (base >> 16) & 0xFF;
+ buf[3] = (base >> 24) & 0xFF;
+ pm80x_bulk_write(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+
+ return 0;
+}
+
+static int pm80x_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct pm80x_rtc_info *info = dev_get_drvdata(dev);
+ unsigned char buf[4];
+ unsigned long ticks, base, data;
+ int ret;
+
+ pm80x_bulk_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+ base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
+
+ pm80x_bulk_read(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
+ data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ ticks = base + data;
+ dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
+ base, data, ticks);
+
+ rtc_time_to_tm(ticks, &alrm->time);
+ ret = pm80x_reg_read(info->map, PM800_RTC_CONTROL);
+ alrm->enabled = (ret & PM800_ALARM1_EN) ? 1 : 0;
+ alrm->pending = (ret & (PM800_ALARM | PM800_ALARM_WAKEUP)) ? 1 : 0;
+ return 0;
+}
+
+static int pm80x_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct pm80x_rtc_info *info = dev_get_drvdata(dev);
+ struct rtc_time now_tm, alarm_tm;
+ unsigned long ticks, base, data;
+ unsigned char buf[4];
+ int mask;
+
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
+
+ pm80x_bulk_read(info->map, PM800_RTC_EXPIRE2_1, buf, 4);
+ base = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ dev_dbg(info->dev, "%x-%x-%x-%x\n", buf[0], buf[1], buf[2], buf[3]);
+
+ /* load 32-bit read-only counter */
+ pm80x_bulk_read(info->map, PM800_RTC_COUNTER1, buf, 4);
+ data = (buf[3] << 24) | (buf[2] << 16) | (buf[1] << 8) | buf[0];
+ ticks = base + data;
+ dev_dbg(info->dev, "get base:0x%lx, RO count:0x%lx, ticks:0x%lx\n",
+ base, data, ticks);
+
+ rtc_time_to_tm(ticks, &now_tm);
+ dev_dbg(info->dev, "%s, now time : %lu\n", __func__, ticks);
+ rtc_next_alarm_time(&alarm_tm, &now_tm, &alrm->time);
+ /* get new ticks for alarm in 24 hours */
+ rtc_tm_to_time(&alarm_tm, &ticks);
+ dev_dbg(info->dev, "%s, alarm time: %lu\n", __func__, ticks);
+ data = ticks - base;
+
+ buf[0] = data & 0xff;
+ buf[1] = (data >> 8) & 0xff;
+ buf[2] = (data >> 16) & 0xff;
+ buf[3] = (data >> 24) & 0xff;
+ pm80x_bulk_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
+ if (alrm->enabled) {
+ mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL, mask, mask);
+ } else {
+ mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL, mask,
+ PM800_ALARM | PM800_ALARM_WAKEUP);
+ }
+ return 0;
+}
+
+static const struct rtc_class_ops pm80x_rtc_ops = {
+ .read_time = pm80x_rtc_read_time,
+ .set_time = pm80x_rtc_set_time,
+ .read_alarm = pm80x_rtc_read_alarm,
+ .set_alarm = pm80x_rtc_set_alarm,
+ .alarm_irq_enable = pm80x_rtc_alarm_irq_enable,
+};
+
+#ifdef CONFIG_PM
+static int pm80x_rtc_suspend(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+
+ if (device_may_wakeup(dev))
+ chip->wu_flag |= (1 << PM800_IRQ_RTC);
+
+ return 0;
+}
+
+static int pm80x_rtc_resume(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+
+ if (device_may_wakeup(dev))
+ chip->wu_flag &= ~(1 << PM800_IRQ_RTC);
+
+ return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(pm80x_rtc_pm_ops, pm80x_rtc_suspend, pm80x_rtc_resume);
+
+static int __devinit pm80x_rtc_probe(struct platform_device *pdev)
+{
+ struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
+ struct pm80x_platform_data *pm80x_pdata;
+ struct pm80x_rtc_pdata *pdata = NULL;
+ struct pm80x_rtc_info *info;
+ struct rtc_time tm;
+ unsigned long ticks = 0;
+ int ret;
+
+ pdata = pdev->dev.platform_data;
+ if (pdata == NULL)
+ dev_warn(&pdev->dev, "No platform data!\n");
+
+ info =
+ devm_kzalloc(&pdev->dev, sizeof(struct pm80x_rtc_info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+ info->irq = platform_get_irq(pdev, 0);
+ if (info->irq < 0) {
+ dev_err(&pdev->dev, "No IRQ resource!\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ info->chip = chip;
+ info->map = chip->regmap;
+ if (!info->map) {
+ dev_err(&pdev->dev, "no regmap!\n");
+ ret = -EINVAL;
+ goto out;
+ }
+
+ info->dev = &pdev->dev;
+ dev_set_drvdata(&pdev->dev, info);
+
+ ret = request_threaded_irq(info->irq, NULL, rtc_update_handler,
+ IRQF_ONESHOT, "rtc", info);
+ if (ret < 0) {
+ dev_err(chip->dev, "Failed to request IRQ: #%d: %d\n",
+ info->irq, ret);
+ goto out;
+ }
+
+ ret = pm80x_rtc_read_time(&pdev->dev, &tm);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to read initial time.\n");
+ goto out_rtc;
+ }
+ if ((tm.tm_year < 70) || (tm.tm_year > 138)) {
+ tm.tm_year = 70;
+ tm.tm_mon = 0;
+ tm.tm_mday = 1;
+ tm.tm_hour = 0;
+ tm.tm_min = 0;
+ tm.tm_sec = 0;
+ ret = pm80x_rtc_set_time(&pdev->dev, &tm);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to set initial time.\n");
+ goto out_rtc;
+ }
+ }
+ rtc_tm_to_time(&tm, &ticks);
+
+ info->rtc_dev = rtc_device_register("88pm80x-rtc", &pdev->dev,
+ &pm80x_rtc_ops, THIS_MODULE);
+ ret = PTR_ERR(info->rtc_dev);
+ if (IS_ERR(info->rtc_dev)) {
+ dev_err(&pdev->dev, "Failed to register RTC device: %d\n", ret);
+ goto out_rtc;
+ }
+ /*
+ * enable internal XO instead of internal 3.25MHz clock since it can
+ * free running in PMIC power-down state.
+ */
+ pm80x_set_bits(info->map, PM800_RTC_CONTROL, PM800_RTC1_USE_XO,
+ PM800_RTC1_USE_XO);
+
+ if (pdev->dev.parent->platform_data) {
+ pm80x_pdata = pdev->dev.parent->platform_data;
+ pdata = pm80x_pdata->rtc;
+ if (pdata)
+ info->rtc_dev->dev.platform_data = &pdata->rtc_wakeup;
+ }
+
+ device_init_wakeup(&pdev->dev, 1);
+
+ return 0;
+out_rtc:
+ free_irq(info->irq, info);
+out:
+ devm_kfree(&pdev->dev, info);
+ return ret;
+}
+
+static int __devexit pm80x_rtc_remove(struct platform_device *pdev)
+{
+ struct pm80x_rtc_info *info = platform_get_drvdata(pdev);
+ platform_set_drvdata(pdev, NULL);
+ rtc_device_unregister(info->rtc_dev);
+ free_irq(info->irq, info);
+ devm_kfree(&pdev->dev, info);
+ return 0;
+}
+
+static struct platform_driver pm80x_rtc_driver = {
+ .driver = {
+ .name = "88pm80x-rtc",
+ .owner = THIS_MODULE,
+ .pm = &pm80x_rtc_pm_ops,
+ },
+ .probe = pm80x_rtc_probe,
+ .remove = __devexit_p(pm80x_rtc_remove),
+};
+
+module_platform_driver(pm80x_rtc_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Marvell 88PM80x RTC driver");
+MODULE_AUTHOR("Qiao Zhou <zhouqiao at marvell.com>");
+MODULE_ALIAS("platform:88pm80x-rtc");
--
1.7.0.4
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