fec: add support for PHY interface platform data

The i.MX25 PDK uses RMII to communicate with its PHY. This patch adds
the ability to configure RMII, based on platform data.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Acked-by:  Greg Ungerer <gerg@uclinux.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 24 insertions, 0 deletions

diff --git a/drivers/net/fec.c b/drivers/net/fec.c
index 42d9ac9ba39..326465ffbb2 100644
--- a/drivers/net/fec.c
+++ b/drivers/net/fec.c
@@ -41,6 +41,7 @@
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/phy.h>
+#include <linux/fec.h>
 
 #include <asm/cacheflush.h>
 
@@ -182,6 +183,7 @@ struct fec_enet_private {
         struct  phy_device *phy_dev;
         int     mii_timeout;
         uint    phy_speed;
+        phy_interface_t phy_interface;
         int     index;
         int     link;
         int     full_duplex;
@@ -1191,6 +1193,21 @@ fec_restart(struct net_device *dev, int duplex)
         /* Set MII speed */
         writel(fep->phy_speed, fep->hwp + FEC_MII_SPEED);
 
+#ifdef FEC_MIIGSK_ENR
+        if (fep->phy_interface == PHY_INTERFACE_MODE_RMII) {
+                /* disable the gasket and wait */
+                writel(0, fep->hwp + FEC_MIIGSK_ENR);
+                while (readl(fep->hwp + FEC_MIIGSK_ENR) & 4)
+                        udelay(1);
+
+                /* configure the gasket: RMII, 50 MHz, no loopback, no echo */
+                writel(1, fep->hwp + FEC_MIIGSK_CFGR);
+
+                /* re-enable the gasket */
+                writel(2, fep->hwp + FEC_MIIGSK_ENR);
+        }
+#endif
+
         /* And last, enable the transmit and receive processing */
         writel(2, fep->hwp + FEC_ECNTRL);
         writel(0, fep->hwp + FEC_R_DES_ACTIVE);
@@ -1226,6 +1243,7 @@ static int __devinit
 fec_probe(struct platform_device *pdev)
 {
         struct fec_enet_private *fep;
+        struct fec_platform_data *pdata;
         struct net_device *ndev;
         int i, irq, ret = 0;
         struct resource *r;
@@ -1259,6 +1277,10 @@ fec_probe(struct platform_device *pdev)
 
         platform_set_drvdata(pdev, ndev);
 
+        pdata = pdev->dev.platform_data;
+        if (pdata)
+                fep->phy_interface = pdata->phy;
+
         /* This device has up to three irqs on some platforms */
         for (i = 0; i < 3; i++) {
                 irq = platform_get_irq(pdev, i);
diff --git a/drivers/net/fec.h b/drivers/net/fec.h
index cc47f3f057c..2c48b25668d 100644
--- a/drivers/net/fec.h
+++ b/drivers/net/fec.h
@@ -43,6 +43,8 @@
 #define FEC_R_DES_START         0x180 /* Receive descriptor ring */
 #define FEC_X_DES_START         0x184 /* Transmit descriptor ring */
 #define FEC_R_BUFF_SIZE         0x188 /* Maximum receive buff size */
+#define FEC_MIIGSK_CFGR         0x300 /* MIIGSK Configuration reg */
+#define FEC_MIIGSK_ENR          0x308 /* MIIGSK Enable reg */
 
 #else