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macb: allow GEM to have configurable receive buffer size

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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>
This commit is contained in:
Jamie Iles 2011-03-14 17:38:30 +00:00
parent 757a03c6e0
commit 0116da4fcc
2 changed files with 22 additions and 0 deletions
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17
drivers/net/ethernet/cadence/macb.c
View File

@ -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);

5
drivers/net/ethernet/cadence/macb.h
View File

@ -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