sh: fix r2d board detection

This patch fixes the R2D-PLUS and R2D-1 board detection code. Tested on two
R2D-PLUS and two R2D-1 boards.
Signed-off-by: NMagnus Damm <damm@igel.co.jp>
Signed-off-by: NPaul Mundt <lethal@linux-sh.org>

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

@@ -130,7 +130,7 @@ void __init init_rts7751r2d_IRQ(void)
 {
 	struct intc_desc *d;
 
-	switch (ctrl_inw(PA_BVERREG)) {
+	switch (ctrl_inw(PA_VERREG) & 0xf0) {
 #ifdef CONFIG_RTS7751R2D_PLUS
 	case 0x10:
 		printk(KERN_INFO "Using R2D-PLUS interrupt controller.\n");
@@ -139,13 +139,16 @@ void __init init_rts7751r2d_IRQ(void)
 		break;
 #endif
 #ifdef CONFIG_RTS7751R2D_1
-	case 0x11:
+	case 0x00: /* according to manual */
+	case 0x30: /* in reality */
 		printk(KERN_INFO "Using R2D-1 interrupt controller.\n");
 		d = &intc_desc_r2d_1;
 		memcpy(irl2irq, irl2irq_r2d_1, R2D_NR_IRL);
 		break;
 #endif
 	default:
+		printk(KERN_INFO "Unknown R2D interrupt controller 0x%04x\n",
+		       ctrl_inw(PA_VERREG));
 		return;
 	}