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Subject[PATCH] gianfar: Solve ethernet TX/RX problems for ls1021a
Date
Add dma_endian_le to solve ethernet TX/RX problems for freescale ls1021a. Without this, it will result in 
rx-busy-errors by ethtool, and transmit queue timeout in ls1021a's platforms.

Signed-off-by: Johnson Chen <johnsonch.chen@moxa.com>
---
drivers/net/ethernet/freescale/gianfar.c | 3 +++
drivers/net/ethernet/freescale/gianfar.h | 4 ++++
2 files changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c
index 72868a28b621..ab4e45199df9 100644
--- a/drivers/net/ethernet/freescale/gianfar.c
+++ b/drivers/net/ethernet/freescale/gianfar.c
@@ -833,6 +833,7 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev)

/* Find the TBI PHY. If it's not there, we don't support SGMII */
priv->tbi_node = of_parse_phandle(np, "tbi-handle", 0);
+ priv->dma_endian_le = of_property_read_bool(np, "fsl,dma-endian-le");

return 0;

@@ -1209,6 +1210,8 @@ static void gfar_start(struct gfar_private *priv)
/* Initialize DMACTRL to have WWR and WOP */
tempval = gfar_read(&regs->dmactrl);
tempval |= DMACTRL_INIT_SETTINGS;
+ if (priv->dma_endian_le)
+ tempval |= DMACTRL_LE;
gfar_write(&regs->dmactrl, tempval);

/* Make sure we aren't stopped */
diff --git a/drivers/net/ethernet/freescale/gianfar.h b/drivers/net/ethernet/freescale/gianfar.h
index 432c6a818ae5..aae07db5206b 100644
--- a/drivers/net/ethernet/freescale/gianfar.h
+++ b/drivers/net/ethernet/freescale/gianfar.h
@@ -215,6 +215,7 @@ extern const char gfar_driver_version[];
#define DMACTRL_INIT_SETTINGS 0x000000c3
#define DMACTRL_GRS 0x00000010
#define DMACTRL_GTS 0x00000008
+#define DMACTRL_LE 0x00008000

#define TSTAT_CLEAR_THALT_ALL 0xFF000000
#define TSTAT_CLEAR_THALT 0x80000000
@@ -1140,6 +1141,9 @@ struct gfar_private {
tx_pause_en:1,
rx_pause_en:1;

+ /* little endian dma buffer and descriptor host interface */
+ unsigned int dma_endian_le;
+
/* The total tx and rx ring size for the enabled queues */
unsigned int total_tx_ring_size;
unsigned int total_rx_ring_size;
--
2.11.0
Best regards,
Johnson
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