diff options
| author | Jamie Iles <jamie@jamieiles.com> | 2011-03-14 18:38:30 +0100 |
|---|---|---|
| committer | Jamie Iles <jamie@jamieiles.com> | 2011-11-22 16:21:20 +0100 |
| commit | 0116da4fcc1ae8a80d9002441e98768f2a6fa2fe (patch) | |
| tree | 503b19e91670f415fa5edfae95cd8b52170d417a /drivers/net | |
| parent | macb: support DMA bus widths > 32 bits (diff) | |
| download | linux-0116da4fcc1ae8a80d9002441e98768f2a6fa2fe.tar.xz linux-0116da4fcc1ae8a80d9002441e98768f2a6fa2fe.zip | |
macb: allow GEM to have configurable receive buffer size
GEM has configurable receive buffer sizes so requires this to be
programmed up. Any size < 2048 and a multiple of 64 bytes is permitted.
Signed-off-by: Jamie Iles <jamie@jamieiles.com>
Acked-by: David S. Miller <davem@davemloft.net>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Tested-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/cadence/macb.c | 17 | ||||
| -rw-r--r-- | drivers/net/ethernet/cadence/macb.h | 5 |
2 files changed, 22 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c index 38f1932013d1..64d61461bdc7 100644 --- a/drivers/net/ethernet/cadence/macb.c +++ b/drivers/net/ethernet/cadence/macb.c @@ -856,6 +856,21 @@ static u32 macb_dbw(struct macb *bp) } } +/* + * Configure the receive DMA engine to use the correct receive buffer size. + * This is a configurable parameter for GEM. + */ +static void macb_configure_dma(struct macb *bp) +{ + u32 dmacfg; + + if (macb_is_gem(bp)) { + dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L); + dmacfg |= GEM_BF(RXBS, RX_BUFFER_SIZE / 64); + gem_writel(bp, DMACFG, dmacfg); + } +} + static void macb_init_hw(struct macb *bp) { u32 config; @@ -874,6 +889,8 @@ static void macb_init_hw(struct macb *bp) config |= macb_dbw(bp); macb_writel(bp, NCFGR, config); + macb_configure_dma(bp); + /* Initialize TX and RX buffers */ macb_writel(bp, RBQP, bp->rx_ring_dma); macb_writel(bp, TBQP, bp->tx_ring_dma); diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h index 71424aae9c50..193107884a5a 100644 --- a/drivers/net/ethernet/cadence/macb.h +++ b/drivers/net/ethernet/cadence/macb.h @@ -64,6 +64,7 @@ /* GEM register offsets. */ #define GEM_NCFGR 0x0004 #define GEM_USRIO 0x000c +#define GEM_DMACFG 0x0010 #define GEM_HRB 0x0080 #define GEM_HRT 0x0084 #define GEM_SA1B 0x0088 @@ -154,6 +155,10 @@ #define GEM_DBW64 1 #define GEM_DBW128 2 +/* Bitfields in DMACFG. */ +#define GEM_RXBS_OFFSET 16 +#define GEM_RXBS_SIZE 8 + /* Bitfields in NSR */ #define MACB_NSR_LINK_OFFSET 0 #define MACB_NSR_LINK_SIZE 1 |