mv643xx_eth: detect alternate TX BW control register location

Some SoCs have the TX bandwidth control registers in a slightly
different place.  This patch detects that case at run time, and
re-directs accesses to those registers to the proper place at
run time if needed.

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Dale Farnsworth <dale@farnsworth.org>

1 files changed, 32 insertions, 5 deletions

diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 296687baccf7..72d3f36ff284 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -108,6 +108,10 @@ static char mv643xx_eth_driver_version[] = "1.0";
 #define INT_MASK(p)                     (0x0468 + ((p) << 10))
 #define INT_MASK_EXT(p)                 (0x046c + ((p) << 10))
 #define TX_FIFO_URGENT_THRESHOLD(p)     (0x0474 + ((p) << 10))
+#define TXQ_FIX_PRIO_CONF_MOVED(p)      (0x04dc + ((p) << 10))
+#define TX_BW_RATE_MOVED(p)             (0x04e0 + ((p) << 10))
+#define TX_BW_MTU_MOVED(p)              (0x04e8 + ((p) << 10))
+#define TX_BW_BURST_MOVED(p)            (0x04ec + ((p) << 10))
 #define RXQ_CURRENT_DESC_PTR(p, q)      (0x060c + ((p) << 10) + ((q) << 4))
 #define RXQ_COMMAND(p)                  (0x0680 + ((p) << 10))
 #define TXQ_CURRENT_DESC_PTR(p, q)      (0x06c0 + ((p) << 10) + ((q) << 2))
@@ -250,6 +254,7 @@ struct mv643xx_eth_shared_private {
          */
         unsigned int t_clk;
         int extended_rx_coal_limit;
+        int tx_bw_control_moved;
 };
 
 
@@ -831,9 +836,15 @@ static void tx_set_rate(struct mv643xx_eth_private *mp, int rate, int burst)
         if (bucket_size > 65535)
                 bucket_size = 65535;
 
-        wrl(mp, TX_BW_RATE(mp->port_num), token_rate);
-        wrl(mp, TX_BW_MTU(mp->port_num), mtu);
-        wrl(mp, TX_BW_BURST(mp->port_num), bucket_size);
+        if (mp->shared->tx_bw_control_moved) {
+                wrl(mp, TX_BW_RATE_MOVED(mp->port_num), token_rate);
+                wrl(mp, TX_BW_MTU_MOVED(mp->port_num), mtu);
+                wrl(mp, TX_BW_BURST_MOVED(mp->port_num), bucket_size);
+        } else {
+                wrl(mp, TX_BW_RATE(mp->port_num), token_rate);
+                wrl(mp, TX_BW_MTU(mp->port_num), mtu);
+                wrl(mp, TX_BW_BURST(mp->port_num), bucket_size);
+        }
 }
 
 static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
@@ -864,7 +875,10 @@ static void txq_set_fixed_prio_mode(struct tx_queue *txq)
         /*
          * Turn on fixed priority mode.
          */
-        off = TXQ_FIX_PRIO_CONF(mp->port_num);
+        if (mp->shared->tx_bw_control_moved)
+                off = TXQ_FIX_PRIO_CONF_MOVED(mp->port_num);
+        else
+                off = TXQ_FIX_PRIO_CONF(mp->port_num);
 
         val = rdl(mp, off);
         val |= 1 << txq->index;
@@ -880,7 +894,10 @@ static void txq_set_wrr(struct tx_queue *txq, int weight)
         /*
          * Turn off fixed priority mode.
          */
-        off = TXQ_FIX_PRIO_CONF(mp->port_num);
+        if (mp->shared->tx_bw_control_moved)
+                off = TXQ_FIX_PRIO_CONF_MOVED(mp->port_num);
+        else
+                off = TXQ_FIX_PRIO_CONF(mp->port_num);
 
         val = rdl(mp, off);
         val &= ~(1 << txq->index);
@@ -2108,6 +2125,16 @@ static void infer_hw_params(struct mv643xx_eth_shared_private *msp)
                 msp->extended_rx_coal_limit = 1;
         else
                 msp->extended_rx_coal_limit = 0;
+
+        /*
+         * Check whether the TX rate control registers are in the
+         * old or the new place.
+         */
+        writel(1, msp->base + TX_BW_MTU_MOVED(0));
+        if (readl(msp->base + TX_BW_MTU_MOVED(0)) & 1)
+                msp->tx_bw_control_moved = 1;
+        else
+                msp->tx_bw_control_moved = 0;
 }
 
 static int mv643xx_eth_shared_probe(struct platform_device *pdev)