diff options
Diffstat (limited to 'src/soc/intel/fsp_baytrail/i2c.c')
| -rw-r--r-- | src/soc/intel/fsp_baytrail/i2c.c | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/src/soc/intel/fsp_baytrail/i2c.c b/src/soc/intel/fsp_baytrail/i2c.c index 5a0d59dfa6..eb83180dd9 100644 --- a/src/soc/intel/fsp_baytrail/i2c.c +++ b/src/soc/intel/fsp_baytrail/i2c.c @@ -26,12 +26,13 @@ static int wait_tx_fifo(char *base_adr) { int i; + u32 as; - if (read32(base_adr + I2C_ABORT_SOURCE) & 0x1ffff) { + as = read32(base_adr + I2C_ABORT_SOURCE) & 0x1ffff; + if (as) { /* Reading back I2C_CLR_TX_ABRT resets abort lock on TX FIFO */ - i = *((volatile unsigned int *)(base_adr + I2C_CLR_TX_ABRT)); - return I2C_ERR_ABORT | - (*((unsigned int *)(base_adr + I2C_ABORT_SOURCE)) & 0x1ffff); + i = read32(base_adr + I2C_CLR_TX_ABRT); + return I2C_ERR_ABORT | as; } /* Wait here for a free slot in TX-FIFO */ @@ -51,11 +52,13 @@ static int wait_tx_fifo(char *base_adr) static int wait_rx_fifo(char *base_adr) { int i; - if (read32(base_adr + I2C_ABORT_SOURCE) & 0x1ffff) { + u32 as; + + as = read32(base_adr + I2C_ABORT_SOURCE) & 0x1ffff; + if (as) { /* Reading back I2C_CLR_TX_ABRT resets abort lock on TX FIFO */ - i = *((volatile unsigned int *)(base_adr + I2C_CLR_TX_ABRT)); - return I2C_ERR_ABORT | - (*((unsigned int *)(base_adr + I2C_ABORT_SOURCE)) & 0x1ffff); + i = read32(base_adr + I2C_CLR_TX_ABRT); + return I2C_ERR_ABORT | as; } /* Wait here for a received entry in RX-FIFO */ @@ -177,6 +180,10 @@ int i2c_read(unsigned bus, unsigned chip, unsigned addr, stat = wait_for_idle(base_ptr); if (stat != I2C_SUCCESS) return stat; + + /* clear any abort status from a previous transaction */ + read32(base_ptr + I2C_CLR_TX_ABRT); + /* Now we can program the desired slave address and start transfer */ write32(base_ptr + I2C_TARGET_ADR, chip & 0xff); /* Send address inside slave to read from */ @@ -232,6 +239,10 @@ int i2c_write(unsigned bus, unsigned chip, unsigned addr, if (stat) { return stat; } + + /* clear any abort status from a previous transaction */ + read32(base_ptr + I2C_CLR_TX_ABRT); + /* Program slave address to use for this transfer */ write32(base_ptr + I2C_TARGET_ADR, chip & 0xff); |