From: Marek Vasut <marex@denx.de>
Date: Sun, 18 Jun 2017 22:55:28 +0200
Subject: rtc: ds1307: Add support for Epson RX8130CE
Git-commit: ee0981be7704589635de23cc32556399c86653a8
Patch-mainline: v4.13-rc1
References: fate#326530,fate#326531,fate#326535,fate#326538,fate#326539
Add support for yet another RTC chip, Epson RX8130CE. This time around,
the chip has slightly permutated registers and also the register starts
at 0x10 instead of 0x0 .
So far, we only support the RTC and NVRAM parts of the chip, Alarm and
Timer is not supported.
Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Felipe Balbi <balbi@ti.com>
Cc: Nishanth Menon <nm@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Mian Yousaf Kaukab <yousaf.kaukab@suse.com>
---
drivers/rtc/rtc-ds1307.c | 175 +++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 175 insertions(+)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 16ace2fb0c0a..3cbb7636b405 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -44,6 +44,7 @@ enum ds_type {
m41t00,
mcp794xx,
rx_8025,
+ rx_8130,
last_ds_type /* always last */
/* rs5c372 too? different address... */
};
@@ -169,6 +170,12 @@ static struct chip_desc chips[last_ds_type] = {
[ds_3231] = {
.alarm = 1,
},
+ [rx_8130] = {
+ .alarm = 1,
+ /* this is battery backed SRAM */
+ .nvram_offset = 0x20,
+ .nvram_size = 4, /* 32bit (4 word x 8 bit) */
+ },
[mcp794xx] = {
.alarm = 1,
/* this is battery backed SRAM */
@@ -192,6 +199,7 @@ static const struct i2c_device_id ds1307_id[] = {
{ "pt7c4338", ds_1307 },
{ "rx8025", rx_8025 },
{ "isl12057", ds_1337 },
+ { "rx8130", rx_8130 },
{ }
};
MODULE_DEVICE_TABLE(i2c, ds1307_id);
@@ -587,6 +595,165 @@ static const struct rtc_class_ops ds13xx_rtc_ops = {
/*----------------------------------------------------------------------*/
/*
+ * Alarm support for rx8130 devices.
+ */
+
+#define RX8130_REG_ALARM_MIN 0x07
+#define RX8130_REG_ALARM_HOUR 0x08
+#define RX8130_REG_ALARM_WEEK_OR_DAY 0x09
+#define RX8130_REG_EXTENSION 0x0c
+#define RX8130_REG_EXTENSION_WADA (1 << 3)
+#define RX8130_REG_FLAG 0x0d
+#define RX8130_REG_FLAG_AF (1 << 3)
+#define RX8130_REG_CONTROL0 0x0e
+#define RX8130_REG_CONTROL0_AIE (1 << 3)
+
+static irqreturn_t rx8130_irq(int irq, void *dev_id)
+{
+ struct ds1307 *ds1307 = dev_id;
+ struct mutex *lock = &ds1307->rtc->ops_lock;
+ u8 ctl[3];
+ int ret;
+
+ mutex_lock(lock);
+
+ /* Read control registers. */
+ ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+ if (ret < 0)
+ goto out;
+ if (!(ctl[1] & RX8130_REG_FLAG_AF))
+ goto out;
+ ctl[1] &= ~RX8130_REG_FLAG_AF;
+ ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
+
+ ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+ if (ret < 0)
+ goto out;
+
+ rtc_update_irq(ds1307->rtc, 1, RTC_AF | RTC_IRQF);
+
+out:
+ mutex_unlock(lock);
+
+ return IRQ_HANDLED;
+}
+
+static int rx8130_read_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ u8 ald[3], ctl[3];
+ int ret;
+
+ if (!test_bit(HAS_ALARM, &ds1307->flags))
+ return -EINVAL;
+
+ /* Read alarm registers. */
+ ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+ if (ret < 0)
+ return ret;
+
+ /* Read control registers. */
+ ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+ if (ret < 0)
+ return ret;
+
+ t->enabled = !!(ctl[2] & RX8130_REG_CONTROL0_AIE);
+ t->pending = !!(ctl[1] & RX8130_REG_FLAG_AF);
+
+ /* Report alarm 0 time assuming 24-hour and day-of-month modes. */
+ t->time.tm_sec = -1;
+ t->time.tm_min = bcd2bin(ald[0] & 0x7f);
+ t->time.tm_hour = bcd2bin(ald[1] & 0x7f);
+ t->time.tm_wday = -1;
+ t->time.tm_mday = bcd2bin(ald[2] & 0x7f);
+ t->time.tm_mon = -1;
+ t->time.tm_year = -1;
+ t->time.tm_yday = -1;
+ t->time.tm_isdst = -1;
+
+ dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d enabled=%d\n",
+ __func__, t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
+ t->time.tm_wday, t->time.tm_mday, t->time.tm_mon, t->enabled);
+
+ return 0;
+}
+
+static int rx8130_set_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ u8 ald[3], ctl[3];
+ int ret;
+
+ if (!test_bit(HAS_ALARM, &ds1307->flags))
+ return -EINVAL;
+
+ dev_dbg(dev, "%s, sec=%d min=%d hour=%d wday=%d mday=%d mon=%d "
+ "enabled=%d pending=%d\n", __func__,
+ t->time.tm_sec, t->time.tm_min, t->time.tm_hour,
+ t->time.tm_wday, t->time.tm_mday, t->time.tm_mon,
+ t->enabled, t->pending);
+
+ /* Read control registers. */
+ ret = regmap_bulk_read(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+ if (ret < 0)
+ return ret;
+
+ ctl[0] &= ~RX8130_REG_EXTENSION_WADA;
+ ctl[1] |= RX8130_REG_FLAG_AF;
+ ctl[2] &= ~RX8130_REG_CONTROL0_AIE;
+
+ ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+ if (ret < 0)
+ return ret;
+
+ /* Hardware alarm precision is 1 minute! */
+ ald[0] = bin2bcd(t->time.tm_min);
+ ald[1] = bin2bcd(t->time.tm_hour);
+ ald[2] = bin2bcd(t->time.tm_mday);
+
+ ret = regmap_bulk_write(ds1307->regmap, RX8130_REG_ALARM_MIN, ald, 3);
+ if (ret < 0)
+ return ret;
+
+ if (!t->enabled)
+ return 0;
+
+ ctl[2] |= RX8130_REG_CONTROL0_AIE;
+
+ return regmap_bulk_write(ds1307->regmap, RX8130_REG_EXTENSION, ctl, 3);
+}
+
+static int rx8130_alarm_irq_enable(struct device *dev, unsigned int enabled)
+{
+ struct ds1307 *ds1307 = dev_get_drvdata(dev);
+ int ret, reg;
+
+ if (!test_bit(HAS_ALARM, &ds1307->flags))
+ return -EINVAL;
+
+ ret = regmap_read(ds1307->regmap, RX8130_REG_CONTROL0, ®);
+ if (ret < 0)
+ return ret;
+
+ if (enabled)
+ reg |= RX8130_REG_CONTROL0_AIE;
+ else
+ reg &= ~RX8130_REG_CONTROL0_AIE;
+
+ return regmap_write(ds1307->regmap, RX8130_REG_CONTROL0, reg);
+}
+
+static const struct rtc_class_ops rx8130_rtc_ops = {
+ .read_time = ds1307_get_time,
+ .set_time = ds1307_set_time,
+ .read_alarm = rx8130_read_alarm,
+ .set_alarm = rx8130_set_alarm,
+ .alarm_irq_enable = rx8130_alarm_irq_enable,
+};
+
+/*----------------------------------------------------------------------*/
+
+/*
* Alarm support for mcp794xx devices.
*/
@@ -1402,6 +1569,14 @@ static int ds1307_probe(struct i2c_client *client,
DS1307_REG_HOUR << 4 | 0x08, hour);
}
break;
+ case rx_8130:
+ ds1307->offset = 0x10; /* Seconds starts at 0x10 */
+ rtc_ops = &rx8130_rtc_ops;
+ if (chip->alarm && ds1307->irq > 0) {
+ irq_handler = rx8130_irq;
+ want_irq = true;
+ }
+ break;
case ds_1388:
ds1307->offset = 1; /* Seconds starts at 1 */
break;
--
2.11.0