[PATCH] skge: fix Yukon-Lite A0 workaround

This is one of those workarounds sucked over from sk98lin driver.
The skge driver needs to detect the Yukon-Lite A0 chip properly,
and turn of Rx FIFO Flush.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index ae1996a3bc5c..fd398da4993b 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -1643,6 +1643,22 @@ static void yukon_reset(struct skge_hw *hw, int port)
                          | GM_RXCR_UCF_ENA | GM_RXCR_MCF_ENA);
 }
 
+/* Apparently, early versions of Yukon-Lite had wrong chip_id? */
+static int is_yukon_lite_a0(struct skge_hw *hw)
+{
+        u32 reg;
+        int ret;
+
+        if (hw->chip_id != CHIP_ID_YUKON)
+                return 0;
+
+        reg = skge_read32(hw, B2_FAR);
+        skge_write8(hw, B2_FAR + 3, 0xff);
+        ret = (skge_read8(hw, B2_FAR + 3) != 0);
+        skge_write32(hw, B2_FAR, reg);
+        return ret;
+}
+
 static void yukon_mac_init(struct skge_hw *hw, int port)
 {
         struct skge_port *skge = netdev_priv(hw->dev[port]);
@@ -1758,9 +1774,11 @@ static void yukon_mac_init(struct skge_hw *hw, int port)
         /* Configure Rx MAC FIFO */
         skge_write16(hw, SK_REG(port, RX_GMF_FL_MSK), RX_FF_FL_DEF_MSK);
         reg = GMF_OPER_ON | GMF_RX_F_FL_ON;
-        if (hw->chip_id == CHIP_ID_YUKON_LITE &&
-            hw->chip_rev >= CHIP_REV_YU_LITE_A3)
+
+        /* disable Rx GMAC FIFO Flush for YUKON-Lite Rev. A0 only */
+        if (is_yukon_lite_a0(hw))
                 reg &= ~GMF_RX_F_FL_ON;
+
         skge_write8(hw, SK_REG(port, RX_GMF_CTRL_T), GMF_RST_CLR);
         skge_write16(hw, SK_REG(port, RX_GMF_CTRL_T), reg);
         /*