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rtc: ds1307: Add support for Epson RX8130CE
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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>
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Marek Vasut authored and Alexandre Belloni committed Jun 24, 2017
1 parent 498bcf3 commit ee0981b
Showing 1 changed file with 175 additions and 0 deletions.
175 changes: 175 additions & 0 deletions drivers/rtc/rtc-ds1307.c
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Original file line number Diff line number Diff line change
Expand Up @@ -44,6 +44,7 @@ enum ds_type {
m41t00,
mcp794xx,
rx_8025,
rx_8130,
last_ds_type /* always last */
/* rs5c372 too? different address... */
};
Expand Down Expand Up @@ -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 */
Expand All @@ -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);
Expand Down Expand Up @@ -586,6 +594,165 @@ 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, &reg);
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.
*/
Expand Down Expand Up @@ -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;
Expand Down

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