diff options
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware.c | 47 |
1 files changed, 40 insertions, 7 deletions
diff --git a/drivers/i2c/busses/i2c-designware.c b/drivers/i2c/busses/i2c-designware.c index e6b1e6ece5d7..887aed6601fb 100644 --- a/drivers/i2c/busses/i2c-designware.c +++ b/drivers/i2c/busses/i2c-designware.c @@ -123,9 +123,27 @@ #define ABRT_SBYTE_ACKDET 7 #define ABRT_SBYTE_NORSTRT 9 #define ABRT_10B_RD_NORSTRT 10 -#define ARB_MASTER_DIS 11 +#define ABRT_MASTER_DIS 11 #define ARB_LOST 12 +#define DW_IC_TX_ABRT_7B_ADDR_NOACK (1UL << ABRT_7B_ADDR_NOACK) +#define DW_IC_TX_ABRT_10ADDR1_NOACK (1UL << ABRT_10ADDR1_NOACK) +#define DW_IC_TX_ABRT_10ADDR2_NOACK (1UL << ABRT_10ADDR2_NOACK) +#define DW_IC_TX_ABRT_TXDATA_NOACK (1UL << ABRT_TXDATA_NOACK) +#define DW_IC_TX_ABRT_GCALL_NOACK (1UL << ABRT_GCALL_NOACK) +#define DW_IC_TX_ABRT_GCALL_READ (1UL << ABRT_GCALL_READ) +#define DW_IC_TX_ABRT_SBYTE_ACKDET (1UL << ABRT_SBYTE_ACKDET) +#define DW_IC_TX_ABRT_SBYTE_NORSTRT (1UL << ABRT_SBYTE_NORSTRT) +#define DW_IC_TX_ABRT_10B_RD_NORSTRT (1UL << ABRT_10B_RD_NORSTRT) +#define DW_IC_TX_ABRT_MASTER_DIS (1UL << ABRT_MASTER_DIS) +#define DW_IC_TX_ARB_LOST (1UL << ARB_LOST) + +#define DW_IC_TX_ABRT_NOACK (DW_IC_TX_ABRT_7B_ADDR_NOACK | \ + DW_IC_TX_ABRT_10ADDR1_NOACK | \ + DW_IC_TX_ABRT_10ADDR2_NOACK | \ + DW_IC_TX_ABRT_TXDATA_NOACK | \ + DW_IC_TX_ABRT_GCALL_NOACK) + static char *abort_sources[] = { [ABRT_7B_ADDR_NOACK] = "slave address not acknowledged (7bit mode)", @@ -472,6 +490,24 @@ i2c_dw_read(struct dw_i2c_dev *dev) } } +static int i2c_dw_handle_tx_abort(struct dw_i2c_dev *dev) +{ + unsigned long abort_source = dev->abort_source; + int i; + + for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources)) + dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]); + + if (abort_source & DW_IC_TX_ARB_LOST) + return -EAGAIN; + else if (abort_source & DW_IC_TX_ABRT_NOACK) + return -EREMOTEIO; + else if (abort_source & DW_IC_TX_ABRT_GCALL_READ) + return -EINVAL; /* wrong msgs[] data */ + else + return -EIO; +} + /* * Prepare controller for a transaction and call i2c_dw_xfer_msg */ @@ -493,6 +529,7 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) dev->msg_read_idx = 0; dev->msg_err = 0; dev->status = STATUS_IDLE; + dev->abort_source = 0; ret = i2c_dw_wait_bus_not_busy(dev); if (ret < 0) @@ -526,12 +563,8 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) /* We have an error */ if (dev->cmd_err == DW_IC_ERR_TX_ABRT) { - unsigned long abort_source = dev->abort_source; - int i; - - for_each_bit(i, &abort_source, ARRAY_SIZE(abort_sources)) { - dev_err(dev->dev, "%s: %s\n", __func__, abort_sources[i]); - } + ret = i2c_dw_handle_tx_abort(dev); + goto done; } ret = -EIO; |