sh: reduce Migo-R smc91x overruns

Improve Migo-R ethernet performance by reducing smc91x overruns.
This is done by enabling SMC91X_NOWAIT and optimizing CS4 setup.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 6 insertions, 2 deletions

diff --git a/arch/sh/boards/mach-migor/setup.c b/arch/sh/boards/mach-migor/setup.c
index 003ce837734d..3e3cc9da34ad 100644
--- a/arch/sh/boards/mach-migor/setup.c
+++ b/arch/sh/boards/mach-migor/setup.c
@@ -37,7 +37,7 @@
  */
 
 static struct smc91x_platdata smc91x_info = {
-        .flags = SMC91X_USE_16BIT,
+        .flags = SMC91X_USE_16BIT | SMC91X_NOWAIT,
 };
 
 static struct resource smc91x_eth_resources[] = {
@@ -463,8 +463,10 @@ static int __init migor_devices_setup(void)
         gpio_direction_output(GPIO_PTJ5, 1);
         gpio_export(GPIO_PTJ5, 0);
 
-        /* SMC91C111 */
+        /* SMC91C111 - Enable IRQ0, Setup CS4 for 16-bit fast access */
         gpio_request(GPIO_FN_IRQ0, NULL);
+        ctrl_outl(0x00003400, BSC_CS4BCR);
+        ctrl_outl(0x00110080, BSC_CS4WCR);
 
         /* KEYSC */
         clk_always_enable("mstp214"); /* KEYSC */
diff --git a/arch/sh/include/asm/migor.h b/arch/sh/include/asm/migor.h
index 70596d38fd67..e451f0229e00 100644
--- a/arch/sh/include/asm/migor.h
+++ b/arch/sh/include/asm/migor.h
@@ -52,7 +52,9 @@
 #define PORT_HIZCRB 0xa405015a
 #define PORT_HIZCRC 0xa405015c
 
+#define BSC_CS4BCR 0xfec10010
 #define BSC_CS6ABCR 0xfec1001c
+#define BSC_CS4WCR 0xfec10030
 
 #include <video/sh_mobile_lcdc.h>