static int i2c_stop(device_t dev) { struct i2c_softc *sc; int reg; int error; sc = device_get_softc(dev); DPRINTF("i2c stop\n"); mtx_lock(&sc->mutex); reg = READ1(sc, I2CSTAT); int mode = (reg >> I2CMODE_S) & I2CMODE_M; reg = (RXTX_EN); reg |= (mode << I2CMODE_S); WRITE1(sc, I2CSTAT, reg); clear_ipend(sc); error = wait_for_nibb(sc); if (error) { DPRINTF("cant i2c stop: nibb error\n"); return (error); } mtx_unlock(&sc->mutex); return (IIC_NOERR); }
static int i2c_stop(device_t dev) { struct i2c_softc *sc; sc = device_get_softc(dev); vf_i2c_dbg(sc, "i2c stop\n"); mtx_lock(&sc->mutex); WRITE1(sc, I2C_IBCR, IBCR_NOACK | IBCR_IBIE); DELAY(100); /* Reset controller if bus still busy after STOP */ if (wait_for_nibb(sc) == IIC_ETIMEOUT) { WRITE1(sc, I2C_IBCR, IBCR_MDIS); DELAY(1000); WRITE1(sc, I2C_IBCR, IBCR_NOACK); } mtx_unlock(&sc->mutex); return (IIC_NOERR); }
static int i2c_stop(device_t dev) { struct i2c_softc *sc; sc = device_get_softc(dev); mtx_lock(&sc->mutex); i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | I2CCR_TXAK); DELAY(100); /* Reset controller if bus still busy after STOP */ if (wait_for_nibb(sc) == IIC_ETIMEOUT) { i2c_write_reg(sc, I2C_CONTROL_REG, 0); DELAY(1000); i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN | I2CCR_TXAK); i2c_write_reg(sc, I2C_STATUS_REG, 0x0); } mtx_unlock(&sc->mutex); return (IIC_NOERR); }
static int i2c_start(device_t dev, u_char slave, int timeout) { struct i2c_softc *sc; int error; int reg; sc = device_get_softc(dev); DPRINTF("i2c start\n"); mtx_lock(&sc->mutex); #if 0 DPRINTF("I2CCON == 0x%08x\n", READ1(sc, I2CCON)); DPRINTF("I2CSTAT == 0x%08x\n", READ1(sc, I2CSTAT)); #endif if (slave & 1) { slave &= ~(1); slave <<= 1; slave |= 1; } else { slave <<= 1; } error = wait_for_nibb(sc); if (error) { mtx_unlock(&sc->mutex); DPRINTF("cant i2c start: IIC_EBUSERR\n"); return (IIC_EBUSERR); } reg = READ1(sc, I2CCON); reg |= (IRQ_EN | ACKGEN); WRITE1(sc, I2CCON, reg); WRITE1(sc, I2CDS, slave); DELAY(50); reg = (RXTX_EN); reg |= I2C_START_STOP; reg |= (I2CMODE_MT << I2CMODE_S); WRITE1(sc, I2CSTAT, reg); error = wait_for_iif(sc); if (error) { DPRINTF("cant i2c start: iif error\n"); mtx_unlock(&sc->mutex); return (error); } if (!is_ack(sc)) { DPRINTF("cant i2c start: no ack\n"); mtx_unlock(&sc->mutex); return (IIC_ENOACK); } mtx_unlock(&sc->mutex); return (IIC_NOERR); }