GEM has configurable receive buffer sizes so requires this to be programmed up.
Signed-off-by: Dave Aldridge fovsoft@gmail.com --- drivers/net/macb.c | 19 +++++++++++++++++++ drivers/net/macb.h | 5 +++++ 2 files changed, 24 insertions(+), 0 deletions(-)
diff --git a/drivers/net/macb.c b/drivers/net/macb.c index 41f1dce..4d21f14 100644 --- a/drivers/net/macb.c +++ b/drivers/net/macb.c @@ -436,6 +436,23 @@ static int macb_phy_init(struct macb_device *macb) } }
+/* + * 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_device *macb) +{ + u32 dmacfg; + u32 rx_ring_buf_size = CONFIG_SYS_MACB_RX_BUFFER_SIZE / + CONFIG_SYS_MACB_RX_RING_SIZE; + + if (macb->is_gem) { + dmacfg = gem_readl(macb, DMACFG) & ~GEM_BF(RXBS, -1L); + dmacfg |= GEM_BF(RXBS, rx_ring_buf_size / 64); + gem_writel(macb, DMACFG, dmacfg); + } +} + static int macb_init(struct eth_device *netdev, bd_t *bd) { struct macb_device *macb = to_macb(netdev); @@ -465,6 +482,8 @@ static int macb_init(struct eth_device *netdev, bd_t *bd) } macb->rx_tail = macb->tx_head = macb->tx_tail = 0;
+ macb_configure_dma(macb); + macb_writel(macb, RBQP, macb->rx_ring_dma); macb_writel(macb, TBQP, macb->tx_ring_dma);
diff --git a/drivers/net/macb.h b/drivers/net/macb.h index c0759cf..e0fbd46 100644 --- a/drivers/net/macb.h +++ b/drivers/net/macb.h @@ -76,6 +76,7 @@ /* 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 @@ -165,6 +166,10 @@ #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