ARM: Orion: Eth: Add clk/clkdev support.

The t_clk is moved from the shared part of the ethernet driver into
the per port section. Each port can have its own gated clock, which it
needs to enable/disable, as oppossed to there being one clock shared
by all ports. In practice, only kirkwood supports this at the moment.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
Signed-off-by: Mike Turquette <mturquette@linaro.org>

1 files changed, 31 insertions, 11 deletions

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 5e1ca0f05090..99cd233266ac 100644
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -57,6 +57,7 @@
 #include <linux/types.h>
 #include <linux/inet_lro.h>
 #include <linux/slab.h>
+#include <linux/clk.h>
 
 static char mv643xx_eth_driver_name[] = "mv643xx_eth";
 static char mv643xx_eth_driver_version[] = "1.4";
@@ -289,10 +290,10 @@ struct mv643xx_eth_shared_private {
         /*
          * Hardware-specific parameters.
          */
-        unsigned int t_clk;
         int extended_rx_coal_limit;
         int tx_bw_control;
         int tx_csum_limit;
+
 };
 
 #define TX_BW_CONTROL_ABSENT            0
@@ -431,6 +432,12 @@ struct mv643xx_eth_private {
         int tx_desc_sram_size;
         int txq_count;
         struct tx_queue txq[8];
+
+        /*
+         * Hardware-specific parameters.
+         */
+        struct clk *clk;
+        unsigned int t_clk;
 };
 
 
@@ -1010,7 +1017,7 @@ static void tx_set_rate(struct mv643xx_eth_private *mp, int rate, int burst)
         int mtu;
         int bucket_size;
 
-        token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+        token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
         if (token_rate > 1023)
                 token_rate = 1023;
 
@@ -1042,7 +1049,7 @@ static void txq_set_rate(struct tx_queue *txq, int rate, int burst)
         int token_rate;
         int bucket_size;
 
-        token_rate = ((rate / 1000) * 64) / (mp->shared->t_clk / 1000);
+        token_rate = ((rate / 1000) * 64) / (mp->t_clk / 1000);
         if (token_rate > 1023)
                 token_rate = 1023;
 
@@ -1309,7 +1316,7 @@ static unsigned int get_rx_coal(struct mv643xx_eth_private *mp)
                 temp = (val & 0x003fff00) >> 8;
 
         temp *= 64000000;
-        do_div(temp, mp->shared->t_clk);
+        do_div(temp, mp->t_clk);
 
         return (unsigned int)temp;
 }
@@ -1319,7 +1326,7 @@ static void set_rx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
         u64 temp;
         u32 val;
 
-        temp = (u64)usec * mp->shared->t_clk;
+        temp = (u64)usec * mp->t_clk;
         temp += 31999999;
         do_div(temp, 64000000);
 
@@ -1345,7 +1352,7 @@ static unsigned int get_tx_coal(struct mv643xx_eth_private *mp)
 
         temp = (rdlp(mp, TX_FIFO_URGENT_THRESHOLD) & 0x3fff0) >> 4;
         temp *= 64000000;
-        do_div(temp, mp->shared->t_clk);
+        do_div(temp, mp->t_clk);
 
         return (unsigned int)temp;
 }
@@ -1354,7 +1361,7 @@ static void set_tx_coal(struct mv643xx_eth_private *mp, unsigned int usec)
 {
         u64 temp;
 
-        temp = (u64)usec * mp->shared->t_clk;
+        temp = (u64)usec * mp->t_clk;
         temp += 31999999;
         do_div(temp, 64000000);
 
@@ -2662,10 +2669,6 @@ static int mv643xx_eth_shared_probe(struct platform_device *pdev)
         if (dram)
                 mv643xx_eth_conf_mbus_windows(msp, dram);
 
-        /*
-         * Detect hardware parameters.
-         */
-        msp->t_clk = (pd != NULL && pd->t_clk != 0) ? pd->t_clk : 133000000;
         msp->tx_csum_limit = (pd != NULL && pd->tx_csum_limit) ?
                                         pd->tx_csum_limit : 9 * 1024;
         infer_hw_params(msp);
@@ -2890,6 +2893,18 @@ static int mv643xx_eth_probe(struct platform_device *pdev)
 
         mp->dev = dev;
 
+        /*
+         * Get the clk rate, if there is one, otherwise use the default.
+         */
+        mp->clk = clk_get(&pdev->dev, (pdev->id ? "1" : "0"));
+        if (!IS_ERR(mp->clk)) {
+                clk_prepare_enable(mp->clk);
+                mp->t_clk = clk_get_rate(mp->clk);
+        } else {
+                mp->t_clk = 133000000;
+                printk(KERN_WARNING "Unable to get clock");
+        }
+
         set_params(mp, pd);
         netif_set_real_num_tx_queues(dev, mp->txq_count);
         netif_set_real_num_rx_queues(dev, mp->rxq_count);
@@ -2978,6 +2993,11 @@ static int mv643xx_eth_remove(struct platform_device *pdev)
         if (mp->phy != NULL)
                 phy_detach(mp->phy);
         cancel_work_sync(&mp->tx_timeout_task);
+
+        if (!IS_ERR(mp->clk)) {
+                clk_disable_unprepare(mp->clk);
+                clk_put(mp->clk);
+        }
         free_netdev(mp->dev);
 
         platform_set_drvdata(pdev, NULL);