arm: cpu: armv8: add support for arm psci reset2.

Current U-Boot has only support for psci reset.
Adding support for arm psci reset2 allows passing of reset level
and other platform sepcific parameters like strap settings
to lowlevel psci implementation.
Signed-off-by: NRajesh Ravi <rajesh.ravi@broadcom.com>
Signed-off-by: NVladimir Olovyannikov <vladimir.olovyannikov@broadcom.com>

arch/arm/cpu/armv8/fwcall.c

@@ -98,6 +98,22 @@ void __noreturn psci_system_reset(void)
 		;
 }
 
+void __noreturn psci_system_reset2(u32 reset_level, u32 cookie)
+{
+	struct pt_regs regs;
+
+	regs.regs[0] = ARM_PSCI_0_2_FN64_SYSTEM_RESET2;
+	regs.regs[1] = PSCI_RESET2_TYPE_VENDOR | reset_level;
+	regs.regs[2] = cookie;
+	if (use_smc_for_psci)
+		smc_call(&regs);
+	else
+		hvc_call(&regs);
+
+	while (1)
+		;
+}
+
 void __noreturn psci_system_off(void)
 {
 	struct pt_regs regs;

arch/arm/include/asm/psci.h

@@ -64,6 +64,7 @@
 #define ARM_PSCI_0_2_FN64_AFFINITY_INFO		ARM_PSCI_0_2_FN64(4)
 #define ARM_PSCI_0_2_FN64_MIGRATE		ARM_PSCI_0_2_FN64(5)
 #define ARM_PSCI_0_2_FN64_MIGRATE_INFO_UP_CPU	ARM_PSCI_0_2_FN64(7)
+#define ARM_PSCI_0_2_FN64_SYSTEM_RESET2		ARM_PSCI_0_2_FN64(18)
 
 /* PSCI 1.0 interface */
 #define ARM_PSCI_1_0_FN_PSCI_FEATURES		ARM_PSCI_0_2_FN(10)
@@ -90,6 +91,9 @@
 #define PSCI_AFFINITY_LEVEL_OFF		1
 #define PSCI_AFFINITY_LEVEL_ON_PENDING	2
 
+#define PSCI_RESET2_TYPE_VENDOR_SHIFT	31
+#define PSCI_RESET2_TYPE_VENDOR		BIT(PSCI_RESET2_TYPE_VENDOR_SHIFT)
+
 #ifndef __ASSEMBLY__
 #include <asm/types.h>
 

arch/arm/include/asm/system.h

@@ -254,6 +254,7 @@ void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs);
 void smc_call(struct pt_regs *args);
 
 void __noreturn psci_system_reset(void);
+void __noreturn psci_system_reset2(u32 reset_level, u32 cookie);
 void __noreturn psci_system_off(void);
 
 #ifdef CONFIG_ARMV8_PSCI