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hw/ds1338.c: Implement support for the control register.

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Signed-off-by: Antoine Mathys <barsamin@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Antoine Mathys 2012-12-13 14:05:28 +00:00 committed by Peter Maydell
parent ed3d37d287
commit 996e91f04b
1 changed files with 13 additions and 4 deletions
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17
hw/ds1338.c
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@ -125,7 +125,8 @@ static int ds1338_send(I2CSlave *i2c, uint8_t data)
s->addr_byte = false;
return 0;
}
if (s->ptr < 8) {
if (s->ptr < 7) {
/* Time register. */
struct tm now;
qemu_get_timedate(&now, s->offset);
switch(s->ptr) {
@ -162,11 +163,19 @@ static int ds1338_send(I2CSlave *i2c, uint8_t data)
case 6:
now.tm_year = from_bcd(data) + 100;
break;
case 7:
/* Control register. Currently ignored. */
break;
}
s->offset = qemu_timedate_diff(&now);
} else if (s->ptr == 7) {
/* Control register. */
/* Ensure bits 2, 3 and 6 will read back as zero. */
data &= 0xB3;
/* Attempting to write the OSF flag to logic 1 leaves the
value unchanged. */
data = (data & ~CTRL_OSF) | (data & s->nvram[s->ptr] & CTRL_OSF);
s->nvram[s->ptr] = data;
} else {
s->nvram[s->ptr] = data;
}