[PATCHv3,9/9] macb: allow GEM to have configurable receive buffer size
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Message ID 1312881411-2376-10-git-send-email-jamie@jamieiles.com
State New, archived
Headers show

Commit Message

Jamie Iles Aug. 9, 2011, 9:16 a.m. UTC
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>
---
 drivers/net/macb.c |   17 +++++++++++++++++
 drivers/net/macb.h |    5 +++++
 2 files changed, 22 insertions(+), 0 deletions(-)

Comments

Jean-Christophe PLAGNIOL-VILLARD Aug. 9, 2011, 2:59 p.m. UTC | #1
On 10:16 Tue 09 Aug     , Jamie Iles wrote:
> 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>
Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

Best Regards,
J.

Patch
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diff --git a/drivers/net/macb.c b/drivers/net/macb.c
index a8a9b4b..69c9808 100644
--- a/drivers/net/macb.c
+++ b/drivers/net/macb.c
@@ -857,6 +857,21 @@  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;
@@ -875,6 +890,8 @@  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/macb.h b/drivers/net/macb.h
index 71424aa..1931078 100644
--- a/drivers/net/macb.h
+++ b/drivers/net/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