net/macb: GEM DMA configuration register update

Add information to the DMA Configuration Register to
maximize system performance:
- rx/tx packet buffer full memory size
- allow possibility to use INCR16 if supported

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Joachim Eastwood <manabian@gmail.com
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 19 insertions, 2 deletions

diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index cc6e593dd65..6a59bce38a8 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -1033,8 +1033,12 @@ 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.
+ * Configure the receive DMA engine
+ * - use the correct receive buffer size
+ * - set the possibility to use INCR16 bursts
+ *   (if not supported by FIFO, it will fallback to default)
+ * - set both rx/tx packet buffers to full memory size
+ * These are configurable parameters for GEM.
  */
 static void macb_configure_dma(struct macb *bp)
 {
@@ -1043,6 +1047,8 @@ static void macb_configure_dma(struct macb *bp)
         if (macb_is_gem(bp)) {
                 dmacfg = gem_readl(bp, DMACFG) & ~GEM_BF(RXBS, -1L);
                 dmacfg |= GEM_BF(RXBS, RX_BUFFER_SIZE / 64);
+                dmacfg |= GEM_BF(FBLDO, 16);
+                dmacfg |= GEM_BIT(TXPBMS) | GEM_BF(RXBMS, -1L);
                 gem_writel(bp, DMACFG, dmacfg);
         }
 }
diff --git a/drivers/net/ethernet/cadence/macb.h b/drivers/net/ethernet/cadence/macb.h
index 44144218dd3..570908b9357 100644
--- a/drivers/net/ethernet/cadence/macb.h
+++ b/drivers/net/ethernet/cadence/macb.h
@@ -171,8 +171,19 @@
 #define GEM_DBW128                              2
 
 /* Bitfields in DMACFG. */
+#define GEM_FBLDO_OFFSET                        0
+#define GEM_FBLDO_SIZE                          5
+#define GEM_RXBMS_OFFSET                        8
+#define GEM_RXBMS_SIZE                          2
+#define GEM_TXPBMS_OFFSET                       10
+#define GEM_TXPBMS_SIZE                         1
+#define GEM_TXCOEN_OFFSET                       11
+#define GEM_TXCOEN_SIZE                         1
 #define GEM_RXBS_OFFSET                         16
 #define GEM_RXBS_SIZE                           8
+#define GEM_DDRP_OFFSET                         24
+#define GEM_DDRP_SIZE                           1
+
 
 /* Bitfields in NSR */
 #define MACB_NSR_LINK_OFFSET                    0