kmp204x/qrio: prepare support for the CPU watchdog reset reason

To achieve this, the qrio_cpuwd_flag() function that sets the CPU watchdog
flag in the REASON1 reg is added.

Signed-off-by: Rainer Boschung <rainer.boschung@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Reviewed-by: York Sun <yorksun@freescale.com>

board/keymile/kmp204x/kmp204x.h

@@ -24,5 +24,7 @@ void qrio_wdmask(u8 bit, bool wden);
 void qrio_prstcfg(u8 bit, u8 mode);
 void qrio_set_leds(void);
 void qrio_enable_app_buffer(void);
+void qrio_cpuwd_flag(bool flag);
+int qrio_reset_reason(void);
 
 void pci_of_setup(void *blob, bd_t *bd);

board/keymile/kmp204x/qrio.c

@@ -173,3 +173,18 @@ void qrio_enable_app_buffer(void)
 	ctrll |= (CTRLL_WRB_BUFENA);
 	out_8(qrio_base + CTRLL_OFF, ctrll);
 }
+
+#define REASON1_OFF	0x12
+#define REASON1_CPUWD	0x01
+
+void qrio_cpuwd_flag(bool flag)
+{
+	u8 reason1;
+	void __iomem *qrio_base = (void *)CONFIG_SYS_QRIO_BASE;
+	reason1 = in_8(qrio_base + REASON1_OFF);
+	if (flag)
+		reason1 |= REASON1_CPUWD;
+	else
+		reason1 &= ~REASON1_CPUWD;
+	out_8(qrio_base + REASON1_OFF, reason1);
+}