[PATCH 3/7] smc911x: add 16bit bus width support

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@xxxxxxxxxxxx>
---
 drivers/net/smc911x.c |   20 ++++++++++++++++++--
 1 file changed, 18 insertions(+), 2 deletions(-)

diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 2583235..c74ed52 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -47,6 +47,8 @@ struct smc911x_priv {
 	struct mii_device miidev;
 	void __iomem *base;
 
+	u32 width;
+
 	u32 (*reg_read)(struct smc911x_priv *priv, u32 reg);
 	void (*reg_write)(struct smc911x_priv *priv, u32 reg, u32 val);
 };
@@ -78,7 +80,11 @@ static inline u32 smc911x_reg_read(struct smc911x_priv *priv, u32 reg)
 
 static inline u32 __smc911x_reg_read(struct smc911x_priv *priv, u32 reg)
 {
-	return readl(priv->base + reg);
+	if (priv->width)
+		return readl(priv->base + reg);
+	else
+		return ((readw(priv->base + reg) & 0xFFFF) |
+			((readw(priv->base + reg + 2) & 0xFFFF) << 16));
 }
 
 static inline void smc911x_reg_write(struct smc911x_priv *priv, u32 reg,
@@ -90,7 +96,12 @@ static inline void smc911x_reg_write(struct smc911x_priv *priv, u32 reg,
 static inline void __smc911x_reg_write(struct smc911x_priv *priv, u32 reg,
 					u32 val)
 {
-	writel(val, priv->base + reg);
+	if (priv->width) {
+		writel(val, priv->base + reg);
+	} else {
+		writew(val & 0xFFFF, priv->base + reg);
+		writew((val >> 16) & 0xFFFF, priv->base + reg + 2);
+	}
 }
 
 static int smc911x_mac_wait_busy(struct smc911x_priv *priv)
@@ -393,6 +404,11 @@ static int smc911x_probe(struct device_d *dev)
 	int i;
 
 	priv = xzalloc(sizeof(*priv));
+	priv->width = dev->resource[0].flags & IORESOURCE_MEM_TYPE_MASK;
+	if (!priv->width)
+		priv->width = 1;
+	else
+		priv->width = priv->width == IORESOURCE_MEM_32BIT;
 	priv->base = dev_request_mem_region(dev, 0);
 	priv->reg_read = __smc911x_reg_read;
 	priv->reg_write = __smc911x_reg_write;
-- 
1.7.10.4


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