diff options
Diffstat (limited to 'drivers/net/ethernet/cadence/macb.c')
| -rw-r--r-- | drivers/net/ethernet/cadence/macb.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 6a7d3eae8cc7..38f1932013d1 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -835,6 +835,27 @@ static u32 macb_mdc_clk_div(struct macb *bp) return config; } +/* + * Get the DMA bus width field of the network configuration register that we + * should program. We find the width from decoding the design configuration + * register to find the maximum supported data bus width. + */ +static u32 macb_dbw(struct macb *bp) +{ + if (!macb_is_gem(bp)) + return 0; + + switch (GEM_BFEXT(DBWDEF, gem_readl(bp, DCFG1))) { + case 4: + return GEM_BF(DBW, GEM_DBW128); + case 2: + return GEM_BF(DBW, GEM_DBW64); + case 1: + default: + return GEM_BF(DBW, GEM_DBW32); + } +} + static void macb_init_hw(struct macb *bp) { u32 config; @@ -850,6 +871,7 @@ static void macb_init_hw(struct macb *bp) config |= MACB_BIT(CAF); /* Copy All Frames */ if (!(bp->dev->flags & IFF_BROADCAST)) config |= MACB_BIT(NBC); /* No BroadCast */ + config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); /* Initialize TX and RX buffers */ @@ -1276,6 +1298,7 @@ static int __init macb_probe(struct platform_device *pdev) /* Set MII management clock divider */ config = macb_mdc_clk_div(bp); + config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); macb_get_hwaddr(bp); |