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net: macb: Add on the fly CPU endianness detection

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Program management descriptor's access mode according to the
dynamically detected CPU endianness.

Signed-off-by: Arun Chandran <achandran@mvista.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arun Chandran 2015-03-01 11:38:02 +05:30 committed by David S. Miller
parent 759c9359ae
commit 62f6924cb1
1 changed files with 18 additions and 4 deletions
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22
drivers/net/ethernet/cadence/macb.c
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@ -1578,6 +1578,7 @@ static u32 macb_dbw(struct macb *bp)
static void macb_configure_dma(struct macb *bp)
{
u32 dmacfg;
u32 tmp, ncr;
if (macb_is_gem(bp)) {
dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
@ -1586,10 +1587,23 @@ static void macb_configure_dma(struct macb *bp)
dmacfg = GEM_BFINS(FBLDO, bp->dma_burst_length, dmacfg);
dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
dmacfg &= ~GEM_BIT(ENDIA_PKT);
/* Tell the chip to byteswap descriptors on big-endian hosts */
#ifdef __BIG_ENDIAN
dmacfg |= GEM_BIT(ENDIA_DESC);
#endif
/* Find the CPU endianness by using the loopback bit of net_ctrl
* register. save it first. When the CPU is in big endian we
* need to program swaped mode for management descriptor access.
*/
ncr = macb_readl(bp, NCR);
__raw_writel(MACB_BIT(LLB), bp->regs + MACB_NCR);
tmp = __raw_readl(bp->regs + MACB_NCR);
if (tmp == MACB_BIT(LLB))
dmacfg &= ~GEM_BIT(ENDIA_DESC);
else
dmacfg |= GEM_BIT(ENDIA_DESC); /* CPU in big endian */
/* Restore net_ctrl */
macb_writel(bp, NCR, ncr);
if (bp->dev->features & NETIF_F_HW_CSUM)
dmacfg |= GEM_BIT(TXCOEN);
else