mediatek: mt8183: support system reset

Implement system reset handler.

Change-Id: I535ee414616dde8d2b59dec5a723a540a3a1341d
Signed-off-by: kenny liang <kenny.liang@mediatek.com>

plat/mediatek/mt8183/plat_pm.c

@@ -17,11 +17,13 @@
 #include <scu.h>
 #include <mt_gic_v3.h>
 #include <mtk_plat_common.h>
+#include <mtgpio.h>
 #include <mtspmc.h>
-#include <power_tracer.h>
 #include <plat_dcm.h>
 #include <plat_debug.h>
+#include <plat_params.h>
 #include <plat_private.h>
+#include <power_tracer.h>
 #include <pmic.h>
 #include <rtc.h>
 
@@ -132,6 +134,19 @@ static void __dead2 plat_mtk_system_off(void)
 	panic();
 }
 
+static void __dead2 plat_mtk_system_reset(void)
+{
+	struct bl_aux_gpio_info *gpio_reset = plat_get_mtk_gpio_reset();
+
+	INFO("MTK System Reset\n");
+
+	mt_set_gpio_out(gpio_reset->index, gpio_reset->polarity);
+
+	wfi();
+	ERROR("MTK System Reset: operation not handled.\n");
+	panic();
+}
+
 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to be turned
  * on. The level and mpidr determine the affinity instance.
@@ -144,7 +159,7 @@ static const plat_psci_ops_t plat_plat_pm_ops = {
 	.pwr_domain_suspend		= NULL,
 	.pwr_domain_suspend_finish	= NULL,
 	.system_off			= plat_mtk_system_off,
-	.system_reset			= NULL,
+	.system_reset			= plat_mtk_system_reset,
 	.validate_power_state		= NULL,
 	.get_sys_suspend_power_state	= NULL,
 };