diff options
Diffstat (limited to 'drivers/serial/serial_mpc8xx.c')
| -rw-r--r-- | drivers/serial/serial_mpc8xx.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/drivers/serial/serial_mpc8xx.c b/drivers/serial/serial_mpc8xx.c index 808a40f503e..b8d6a81b650 100644 --- a/drivers/serial/serial_mpc8xx.c +++ b/drivers/serial/serial_mpc8xx.c @@ -178,14 +178,13 @@ static int serial_mpc8xx_putc(struct udevice *dev, const char c) rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE]; - /* Wait for last character to go. */ + if (in_be16(&rtx->txbd.cbd_sc) & BD_SC_READY) + return -EAGAIN; + out_8(&rtx->txbuf, c); out_be16(&rtx->txbd.cbd_datlen, 1); setbits_be16(&rtx->txbd.cbd_sc, BD_SC_READY); - while (in_be16(&rtx->txbd.cbd_sc) & BD_SC_READY) - schedule(); - return 0; } @@ -199,9 +198,8 @@ static int serial_mpc8xx_getc(struct udevice *dev) rtx = (struct serialbuffer __iomem *)&cpmp->cp_dpmem[CPM_SERIAL_BASE]; - /* Wait for character to show up. */ - while (in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY) - schedule(); + if (in_be16(&rtx->rxbd.cbd_sc) & BD_SC_EMPTY) + return -EAGAIN; /* the characters are read one by one, * use the rxindex to know the next char to deliver |