diff options
| author | Michael Brown | 2012-07-10 11:52:56 +0200 |
|---|---|---|
| committer | Michael Brown | 2012-07-10 12:21:22 +0200 |
| commit | 9f0b2d25a8e889899711b81213e91d042c58002f (patch) | |
| tree | e4e97becaeccf60bd34b14896a590f0ef4330469 /src/drivers/net/intel.c | |
| parent | [intel] Refill receive ring only after enabling receiver (diff) | |
| download | ipxe-9f0b2d25a8e889899711b81213e91d042c58002f.tar.gz ipxe-9f0b2d25a8e889899711b81213e91d042c58002f.tar.xz ipxe-9f0b2d25a8e889899711b81213e91d042c58002f.zip | |
[intel] Explicitly enable descriptor queues
On i350 the datasheet contradicts itself in stating that the default
value of RXDCTL.ENABLE for queue zero is both set (according to the
"Receive Initialization" section) and unset (according to the "Receive
Descriptor Control - RXDCTL" section). Empirical evidence suggests
that the default value is unset.
Explicitly enable both transmit and receive queues to avoid any
ambiguity.
Signed-off-by: Michael Brown <mcb30@ipxe.org>
Diffstat (limited to 'src/drivers/net/intel.c')
| -rw-r--r-- | src/drivers/net/intel.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/drivers/net/intel.c b/src/drivers/net/intel.c index 8153e095..1fdce1cb 100644 --- a/src/drivers/net/intel.c +++ b/src/drivers/net/intel.c @@ -363,6 +363,7 @@ static void intel_check_link ( struct net_device *netdev ) { static int intel_create_ring ( struct intel_nic *intel, struct intel_ring *ring ) { physaddr_t address; + uint32_t dctl; /* Allocate descriptor ring. Align ring on its own size to * prevent any possible page-crossing errors due to hardware @@ -393,6 +394,11 @@ static int intel_create_ring ( struct intel_nic *intel, writel ( 0, ( intel->regs + ring->reg + INTEL_xDH ) ); writel ( 0, ( intel->regs + ring->reg + INTEL_xDT ) ); + /* Enable ring */ + dctl = readl ( intel->regs + ring->reg + INTEL_xDCTL ); + dctl |= INTEL_xDCTL_ENABLE; + writel ( dctl, intel->regs + ring->reg + INTEL_xDCTL ); + DBGC ( intel, "INTEL %p ring %05x is at [%08llx,%08llx)\n", intel, ring->reg, ( ( unsigned long long ) address ), ( ( unsigned long long ) address + ring->len ) ); |