sh: fix cf support on r2d boards

This patch makes sure cf support is enabled on R2D-PLUS but disabled
on R2D-1. Without this fix R2D-1 boards hang on bootup.

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

arch/sh/boards/renesas/rts7751r2d/setup.c

@@ -140,12 +140,19 @@ static struct platform_device sm501_device = {
 static struct platform_device *rts7751r2d_devices[] __initdata = {
 	&uart_device,
 	&heartbeat_device,
-	&cf_ide_device,
 	&sm501_device,
 };
 
 static int __init rts7751r2d_devices_setup(void)
 {
+	int ret;
+
+	if (ctrl_inw(PA_BVERREG) == 0x10) { /* only working on R2D-PLUS */
+		ret = platform_device_register(&cf_ide_device);
+		if (ret)
+			return ret;
+	}
+
 	return platform_add_devices(rts7751r2d_devices,
 				    ARRAY_SIZE(rts7751r2d_devices));
 }

include/asm-sh/rts7751r2d.h

@@ -37,7 +37,7 @@
 #define PA_VERREG	0xa4000032	/* FPGA Version Register */
 #define PA_INPORT	0xa4000034	/* KEY Input Port control */
 #define PA_OUTPORT	0xa4000036	/* LED control */
-#define PA_DMPORT	0xa4000038	/* DM270 Output Port control */
+#define PA_BVERREG	0xa4000038	/* Board Revision Register */
 
 #define PA_AX88796L	0xaa000400	/* AX88796L Area */
 #define PA_VOYAGER	0xab000000	/* VOYAGER GX Area */