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bnx2: Fix reset bug on 5709 

The 5709 chip requires the BNX2_MISC_NEW_CORE_CTL_DMA_ENABLE bit to be
cleared and polling for pending DMAs to complete before chip reset.
Without this step, we've seen NMIs during repeated resets of the chip.

Signed-off-by: Eddie Wai <waie@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eddie Wai 2010-11-24 13:48:54 +00:00 committed by David S. Miller
parent 19eb5cc559
commit a5dac108d5
2 changed files with 24 additions and 7 deletions
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29
drivers/net/bnx2.c
View File

@ -4640,13 +4640,28 @@ bnx2_reset_chip(struct bnx2 *bp, u32 reset_code)
/* Wait for the current PCI transaction to complete before
* issuing a reset. */
REG_WR(bp, BNX2_MISC_ENABLE_CLR_BITS,
BNX2_MISC_ENABLE_CLR_BITS_TX_DMA_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_DMA_ENGINE_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_RX_DMA_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_HOST_COALESCE_ENABLE);
val = REG_RD(bp, BNX2_MISC_ENABLE_CLR_BITS);
udelay(5);
if ((CHIP_NUM(bp) == CHIP_NUM_5706) ||
(CHIP_NUM(bp) == CHIP_NUM_5708)) {
REG_WR(bp, BNX2_MISC_ENABLE_CLR_BITS,
BNX2_MISC_ENABLE_CLR_BITS_TX_DMA_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_DMA_ENGINE_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_RX_DMA_ENABLE |
BNX2_MISC_ENABLE_CLR_BITS_HOST_COALESCE_ENABLE);
val = REG_RD(bp, BNX2_MISC_ENABLE_CLR_BITS);
udelay(5);
} else { /* 5709 */
val = REG_RD(bp, BNX2_MISC_NEW_CORE_CTL);
val &= ~BNX2_MISC_NEW_CORE_CTL_DMA_ENABLE;
REG_WR(bp, BNX2_MISC_NEW_CORE_CTL, val);
val = REG_RD(bp, BNX2_MISC_NEW_CORE_CTL);
for (i = 0; i < 100; i++) {
msleep(1);
val = REG_RD(bp, BNX2_PCICFG_DEVICE_CONTROL);
if (!(val & BNX2_PCICFG_DEVICE_STATUS_NO_PEND))
break;
}
}
/* Wait for the firmware to tell us it is ok to issue a reset. */
bnx2_fw_sync(bp, BNX2_DRV_MSG_DATA_WAIT0 | reset_code, 1, 1);

2
drivers/net/bnx2.h
View File

@ -461,6 +461,8 @@ struct l2_fhdr {
#define BNX2_PCICFG_MAILBOX_QUEUE_ADDR 0x00000090
#define BNX2_PCICFG_MAILBOX_QUEUE_DATA 0x00000094
#define BNX2_PCICFG_DEVICE_CONTROL 0x000000b4
#define BNX2_PCICFG_DEVICE_STATUS_NO_PEND ((1L<<5)<<16)
/*
* pci_reg definition