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Always ignore the START and STOP bits whenever the control register is

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being overwritten, they are set only bits (cleared by hardware).

Disable the Acknowledge of the controller slave address.  The slave mode is
not supported.

Make sure the interrupt flag bit is being cleared as recommended, add a
delay() _after_ clear the interrupt bit.

Sponsored by:	Rubicon Communications, LLC (Netgate)
This commit is contained in:
Luiz Otavio O Souza 2017-06-20 18:38:51 +00:00
parent 8b4debd261
commit aee2c3a86a
1 changed files with 8 additions and 4 deletions
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12
sys/dev/iicbus/twsi/twsi.c
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@ -114,6 +114,7 @@ twsi_control_clear(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val &= ~mask;
TWSI_WRITE(sc, sc->reg_control, val);
}
@ -124,6 +125,7 @@ twsi_control_set(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val |= mask;
TWSI_WRITE(sc, sc->reg_control, val);
}
@ -204,8 +206,8 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
}
TWSI_WRITE(sc, sc->reg_data, slave);
DELAY(1000);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
debugf("timeout sending slave address\n");
@ -251,7 +253,7 @@ twsi_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
TWSI_WRITE(sc, sc->reg_soft_reset, 0x0);
DELAY(2000);
TWSI_WRITE(sc, sc->reg_baud_rate, param);
TWSI_WRITE(sc, sc->reg_control, TWSI_CONTROL_TWSIEN | TWSI_CONTROL_ACK);
TWSI_WRITE(sc, sc->reg_control, TWSI_CONTROL_TWSIEN);
DELAY(1000);
mtx_unlock(&sc->mutex);
@ -266,9 +268,10 @@ twsi_stop(device_t dev)
sc = device_get_softc(dev);
mtx_lock(&sc->mutex);
twsi_control_clear(sc, TWSI_CONTROL_ACK);
twsi_control_set(sc, TWSI_CONTROL_STOP);
DELAY(1000);
twsi_clear_iflg(sc);
DELAY(1000);
mtx_unlock(&sc->mutex);
return (IIC_NOERR);
@ -341,8 +344,8 @@ twsi_read(device_t dev, char *buf, int len, int *read, int last, int delay)
else
twsi_control_set(sc, TWSI_CONTROL_ACK);
DELAY (1000);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, delay, TWSI_CONTROL_IFLG)) {
debugf("timeout reading data\n");
@ -382,6 +385,7 @@ twsi_write(device_t dev, const char *buf, int len, int *sent, int timeout)
TWSI_WRITE(sc, sc->reg_data, *buf++);
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
debugf("timeout writing data\n");
rv = IIC_ETIMEOUT;