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mpc83xx: Fix the UEC driver bug of QE

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The patch prevents the GCC tool chain from striping useful code for
optimization. It will make UEC ethernet driver workable, Otherwise the
UEC will fail in tx when you are using gcc4.x. but the driver can work
when using gcc3.4.3.

CHANGELOG

*Prevent the GCC from striping code for optimization, Otherwise the UEC
will tx failed when you are using gcc4.x.

Signed-off-by: Dave Liu <daveliu@freescale.com>
This commit is contained in:
Dave Liu
2006-12-06 11:38:17 +08:00
committed by Kim Phillips
parent fdd1d6dcc9
commit ddd02492f4
1 changed files with 6 additions and 8 deletions
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14
drivers/qe/uec.c
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@@ -1122,7 +1122,7 @@ static int uec_send(struct eth_device* dev, volatile void *buf, int len)
uec_private_t *uec; uec_private_t *uec;
ucc_fast_private_t *uccf; ucc_fast_private_t *uccf;
volatile qe_bd_t *bd; volatile qe_bd_t *bd;
volatile u16 status; u16 status;
int i; int i;
int result = 0; int result = 0;
@@ -1131,7 +1131,7 @@ static int uec_send(struct eth_device* dev, volatile void *buf, int len)
bd = uec->txBd; bd = uec->txBd;
/* Find an empty TxBD */ /* Find an empty TxBD */
for (i = 0; BD_STATUS(bd) & TxBD_READY; i++) { for (i = 0; bd->status & TxBD_READY; i++) {
if (i > 0x100000) { if (i > 0x100000) {
printf("%s: tx buffer not ready\n", dev->name); printf("%s: tx buffer not ready\n", dev->name);
return result; return result;
@@ -1150,13 +1150,11 @@ static int uec_send(struct eth_device* dev, volatile void *buf, int len)
ucc_fast_transmit_on_demand(uccf); ucc_fast_transmit_on_demand(uccf);
/* Wait for buffer to be transmitted */ /* Wait for buffer to be transmitted */
status = BD_STATUS(bd); for (i = 0; bd->status & TxBD_READY; i++) {
for (i = 0; status & TxBD_READY; i++) {
if (i > 0x100000) { if (i > 0x100000) {
printf("%s: tx error\n", dev->name); printf("%s: tx error\n", dev->name);
return result; return result;
} }
status = BD_STATUS(bd);
} }
/* Ok, the buffer be transimitted */ /* Ok, the buffer be transimitted */
@@ -1171,12 +1169,12 @@ static int uec_recv(struct eth_device* dev)
{ {
uec_private_t *uec = dev->priv; uec_private_t *uec = dev->priv;
volatile qe_bd_t *bd; volatile qe_bd_t *bd;
volatile u16 status; u16 status;
u16 len; u16 len;
u8 *data; u8 *data;
bd = uec->rxBd; bd = uec->rxBd;
status = BD_STATUS(bd); status = bd->status;
while (!(status & RxBD_EMPTY)) { while (!(status & RxBD_EMPTY)) {
if (!(status & RxBD_ERROR)) { if (!(status & RxBD_ERROR)) {
@@ -1190,7 +1188,7 @@ static int uec_recv(struct eth_device* dev)
BD_LENGTH_SET(bd, 0); BD_LENGTH_SET(bd, 0);
BD_STATUS_SET(bd, status | RxBD_EMPTY); BD_STATUS_SET(bd, status | RxBD_EMPTY);
BD_ADVANCE(bd, status, uec->p_rx_bd_ring); BD_ADVANCE(bd, status, uec->p_rx_bd_ring);
status = BD_STATUS(bd); status = bd->status;
} }
uec->rxBd = bd; uec->rxBd = bd;