imx: imx8ulp: enable wdog_ad interrupt in CMC1

Enable wdog_ad interrupt being triggered by CMC1 to CM33 to let CM33
know A35 reset and reinitialize rpmsg.
Clear wdog_ad and AD_PERIPH reset interrupt after A35 up, otherwise
M33 will always receive interrupt.

Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

diff --git a/arch/arm/mach-imx/imx8ulp/soc.c b/arch/arm/mach-imx/imx8ulp/soc.c
index eb540e3..569558c 100644 (file)
--- a/arch/arm/mach-imx/imx8ulp/soc.c
+++ b/arch/arm/mach-imx/imx8ulp/soc.c
@@ -571,6 +571,19 @@ int arch_cpu_init(void)
                int ret;
                bool rdc_en = true; /* Default assume DBD_EN is set */
 
+               /* Enable System Reset Interrupt using WDOG_AD */
+               setbits_le32(CMC1_BASE_ADDR + 0x8C, BIT(13));
+               /* Clear AD_PERIPH Power switch domain out of reset interrupt flag */
+               setbits_le32(CMC1_BASE_ADDR + 0x70, BIT(4));
+
+               if (readl(CMC1_BASE_ADDR + 0x90) & BIT(13)) {
+                       /* Clear System Reset Interrupt Flag Register of WDOG_AD */
+                       setbits_le32(CMC1_BASE_ADDR + 0x90, BIT(13));
+                       /* Reset WDOG to clear reset request */
+                       pcc_reset_peripheral(3, WDOG3_PCC3_SLOT, true);
+                       pcc_reset_peripheral(3, WDOG3_PCC3_SLOT, false);
+               }
+
                /* Disable wdog */
                init_wdog();