smc911x: add 16 bit support
Signed-off-by: Jens Gehrlein <sew_s@tqs.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>
diff --git a/README b/README
index f14fb7b..f3957f1 100644
--- a/README
+++ b/README
@@ -786,6 +786,21 @@
Define this to use i/o functions instead of macros
(some hardware wont work with macros)
+ CONFIG_DRIVER_SMC911X
+ Support for SMSC's LAN911x and LAN921x chips
+
+ CONFIG_DRIVER_SMC911X_BASE
+ Define this to hold the physical address
+ of the device (I/O space)
+
+ CONFIG_DRIVER_SMC911X_32_BIT
+ Define this if data bus is 32 bits
+
+ CONFIG_DRIVER_SMC911X_16_BIT
+ Define this if data bus is 16 bits. If your processor
+ automatically converts one 32 bit word to two 16 bit
+ words you may also try CONFIG_DRIVER_SMC911X_32_BIT.
+
- USB Support:
At the moment only the UHCI host controller is
supported (PIP405, MIP405, MPC5200); define
diff --git a/drivers/net/smc911x.c b/drivers/net/smc911x.c
index 5302cb5..6d93bf0 100644
--- a/drivers/net/smc911x.c
+++ b/drivers/net/smc911x.c
@@ -30,6 +30,12 @@
#include <net.h>
#include <miiphy.h>
+#if defined (CONFIG_DRIVER_SMC911X_32_BIT) && \
+ defined (CONFIG_DRIVER_SMC911X_16_BIT)
+#error "SMC911X: Only one of CONFIG_DRIVER_SMC911X_32_BIT and \
+ CONFIG_DRIVER_SMC911X_16_BIT shall be set"
+#endif
+
#ifdef CONFIG_DRIVER_SMC911X_32_BIT
static inline u32 reg_read(u32 addr)
{
@@ -39,9 +45,20 @@
{
*(volatile u32*)addr = val;
}
+#elif CONFIG_DRIVER_SMC911X_16_BIT
+static inline u32 reg_read(u32 addr)
+{
+ volatile u16 *addr_16 = (u16 *)addr;
+ return ((*addr_16 & 0x0000ffff) | (*(addr_16 + 1) << 16));
+}
+static inline void reg_write(u32 addr, u32 val)
+{
+ *(volatile u16*)addr = (u16)val;
+ *(volatile u16*)(addr + 2) = (u16)(val >> 16);
+}
#else
-#error "SMC911X: Only 32-bit bus is supported"
-#endif
+#error "SMC911X: undefined bus width"
+#endif /* CONFIG_DRIVER_SMC911X_16_BIT */
#define mdelay(n) udelay((n)*1000)