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DM9000: Make driver work properly for DM9000A

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The DM9000A network controller does not work with the U-boot DM9000x driver.
Analysis showed that many incoming packets are lost.

The DM9000A Application Notes V1.20 (section 5.6.1) recommend that the poll to
check for a valid rx packet be done on the interrupt status register, not
directly by performing the dummy read and the rx status check as is currently
the case in the u-boot driver.

When the recommended poll is done as suggested the driver starts working
correctly on 10Mbit/HD, but on 100MBit/FD packets come in faster so that there
can be more than 1 package in the fifo at the same time.

The driver must perform the rx-status check in a loop and read and handle all
packages until there is no more left _after_ the interrupt RX flag is set.

This change has been tested with DM9000A, DM9000E, DM9000EP.

Signed-off-by: Remy Bohmer <linux@bohmer.net>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
This commit is contained in:
Remy Bohmer 2008-06-03 15:26:25 +02:00 committed by Ben Warren
parent fbcb7ece0e
commit 850ba7555d
1 changed files with 55 additions and 40 deletions
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95
drivers/net/dm9000x.c
View file

@ -40,6 +40,10 @@ v1.2 03/18/2003 Weilun Huang <weilun_huang@davicom.com.tw>:
Sascha Hauer <saschahauer@web.de>
06/03/2008 Remy Bohmer <linux@bohmer.net>
- Fixed the driver to work with DM9000A.
(check on ISR receive status bit before reading the
FIFO as described in DM9000 programming guide and
application notes)
- Added autodetect of databus width.
- Made debug code compile again.
- Adapt eth_send such that it matches the DM9000*
@ -598,53 +602,64 @@ eth_rx(void)
u16 RxStatus, RxLen = 0;
struct board_info *db = &dm9000_info;
/* Check packet ready or not */
DM9000_ior(DM9000_MRCMDX); /* Dummy read */
rxbyte = DM9000_inb(DM9000_DATA); /* Got most updated data */
if (rxbyte == 0)
/* Check packet ready or not, we must check
the ISR status first for DM9000A */
if (!(DM9000_ior(DM9000_ISR) & 0x01)) /* Rx-ISR bit must be set. */
return 0;
/* Status check: this byte must be 0 or 1 */
if (rxbyte > 1) {
DM9000_iow(DM9000_RCR, 0x00); /* Stop Device */
DM9000_iow(DM9000_ISR, 0x80); /* Stop INT request */
DM9000_DBG("rx status check: %d\n", rxbyte);
}
DM9000_DBG("receiving packet\n");
DM9000_iow(DM9000_ISR, 0x01); /* clear PR status latched in bit 0 */
/* A packet ready now & Get status/length */
DM9000_outb(DM9000_MRCMD, DM9000_IO);
/* There is _at least_ 1 package in the fifo, read them all */
for (;;) {
DM9000_ior(DM9000_MRCMDX); /* Dummy read */
(db->rx_status)(&RxStatus, &RxLen);
/* Get most updated data */
rxbyte = DM9000_inb(DM9000_DATA);
DM9000_DBG("rx status: 0x%04x rx len: %d\n", RxStatus, RxLen);
/* Move data from DM9000 */
/* Read received packet from RX SRAM */
(db->inblk)(rdptr, RxLen);
if ((RxStatus & 0xbf00) || (RxLen < 0x40)
|| (RxLen > DM9000_PKT_MAX)) {
if (RxStatus & 0x100) {
printf("rx fifo error\n");
/* Status check: this byte must be 0 or 1 */
if (rxbyte > DM9000_PKT_RDY) {
DM9000_iow(DM9000_RCR, 0x00); /* Stop Device */
DM9000_iow(DM9000_ISR, 0x80); /* Stop INT request */
printf("DM9000 error: status check fail: 0x%x\n",
rxbyte);
return 0;
}
if (RxStatus & 0x200) {
printf("rx crc error\n");
}
if (RxStatus & 0x8000) {
printf("rx length error\n");
}
if (RxLen > DM9000_PKT_MAX) {
printf("rx length too big\n");
dm9000_reset();
}
} else {
DM9000_DMP_PACKET("eth_rx", rdptr, RxLen);
/* Pass to upper layer */
DM9000_DBG("passing packet to upper layer\n");
NetReceive(NetRxPackets[0], RxLen);
return RxLen;
if (rxbyte != DM9000_PKT_RDY)
return 0; /* No packet received, ignore */
DM9000_DBG("receiving packet\n");
/* A packet ready now & Get status/length */
(db->rx_status)(&RxStatus, &RxLen);
DM9000_DBG("rx status: 0x%04x rx len: %d\n", RxStatus, RxLen);
/* Move data from DM9000 */
/* Read received packet from RX SRAM */
(db->inblk)(rdptr, RxLen);
if ((RxStatus & 0xbf00) || (RxLen < 0x40)
|| (RxLen > DM9000_PKT_MAX)) {
if (RxStatus & 0x100) {
printf("rx fifo error\n");
}
if (RxStatus & 0x200) {
printf("rx crc error\n");
}
if (RxStatus & 0x8000) {
printf("rx length error\n");
}
if (RxLen > DM9000_PKT_MAX) {
printf("rx length too big\n");
dm9000_reset();
}
} else {
DM9000_DMP_PACKET("eth_rx", rdptr, RxLen);
DM9000_DBG("passing packet to upper layer\n");
NetReceive(NetRxPackets[0], RxLen);
}
}
return 0;
}