rtc: Add rtc support to 88PM80X PMIC
authorQiao Zhou <zhouqiao@marvell.com>
Mon, 9 Jul 2012 06:37:34 +0000 (14:37 +0800)
committerSamuel Ortiz <sameo@linux.intel.com>
Mon, 9 Jul 2012 13:17:43 +0000 (15:17 +0200)
add rtc driver for MARVELL 88PM80X PMIC and enable rtc function.

Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Qiao Zhou <zhouqiao@marvell.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
drivers/rtc/Kconfig
drivers/rtc/Makefile
drivers/rtc/rtc-88pm80x.c [new file with mode: 0644]

index 08cbdb900a18a290a7065bc73850015f8278ca10..f049c02413ce28b99e5a0cfa781f8ac0df06e97b 100644 (file)
@@ -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_88PM800
+       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
index 2973921c30d84d70eafea434dd3e678e4c54c3c1..0d5b2b66f90d4f47f97b3cf88fec79ebb2ff4028 100644 (file)
@@ -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 (file)
index 0000000..a2f956d
--- /dev/null
@@ -0,0 +1,371 @@
+/*
+ * Real Time Clock driver for Marvell 88PM80x PMIC
+ *
+ * Copyright (c) 2012 Marvell International Ltd.
+ *  Wenzeng Chen<wzch@marvell.com>
+ *  Qiao Zhou <zhouqiao@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/slab.h>
+#include <linux/regmap.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/88pm80x.h>
+#include <linux/rtc.h>
+
+#define PM800_RTC_COUNTER1             (0xD1)
+#define PM800_RTC_COUNTER2             (0xD2)
+#define PM800_RTC_COUNTER3             (0xD3)
+#define PM800_RTC_COUNTER4             (0xD4)
+#define PM800_RTC_EXPIRE1_1            (0xD5)
+#define PM800_RTC_EXPIRE1_2            (0xD6)
+#define PM800_RTC_EXPIRE1_3            (0xD7)
+#define PM800_RTC_EXPIRE1_4            (0xD8)
+#define PM800_RTC_TRIM1                        (0xD9)
+#define PM800_RTC_TRIM2                        (0xDA)
+#define PM800_RTC_TRIM3                        (0xDB)
+#define PM800_RTC_TRIM4                        (0xDC)
+#define PM800_RTC_EXPIRE2_1            (0xDD)
+#define PM800_RTC_EXPIRE2_2            (0xDE)
+#define PM800_RTC_EXPIRE2_3            (0xDF)
+#define PM800_RTC_EXPIRE2_4            (0xE0)
+
+#define PM800_POWER_DOWN_LOG1  (0xE5)
+#define PM800_POWER_DOWN_LOG2  (0xE6)
+
+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 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;
+       regmap_update_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)
+               regmap_update_bits(info->map, PM800_RTC_CONTROL,
+                                  PM800_ALARM1_EN, PM800_ALARM1_EN);
+       else
+               regmap_update_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;
+       regmap_raw_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 */
+       regmap_raw_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 */
+       regmap_raw_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;
+       regmap_raw_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;
+
+       regmap_raw_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]);
+
+       regmap_raw_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);
+       regmap_read(info->map, PM800_RTC_CONTROL, &ret);
+       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;
+
+       regmap_update_bits(info->map, PM800_RTC_CONTROL, PM800_ALARM1_EN, 0);
+
+       regmap_raw_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 */
+       regmap_raw_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;
+       regmap_raw_write(info->map, PM800_RTC_EXPIRE1_1, buf, 4);
+       if (alrm->enabled) {
+               mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
+               regmap_update_bits(info->map, PM800_RTC_CONTROL, mask, mask);
+       } else {
+               mask = PM800_ALARM | PM800_ALARM_WAKEUP | PM800_ALARM1_EN;
+               regmap_update_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)
+{
+       return pm80x_dev_suspend(dev);
+}
+
+static int pm80x_rtc_resume(struct device *dev)
+{
+       return pm80x_dev_resume(dev);
+}
+#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 = pm80x_request_irq(chip, info->irq, 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.
+        */
+       regmap_update_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:
+       pm80x_free_irq(chip, 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);
+       pm80x_free_irq(info->chip, 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@marvell.com>");
+MODULE_ALIAS("platform:88pm80x-rtc");