ARM: PSCI: Rework the DT handler slightly

The way the PSCI DT update happens currently means we pull in
<asm/armv7.h> everywhere, including on ARMv8 and that in turn brings in
<asm/io.h> for some non-PSCI related things that header needs to deal
with.

To fix this, we rework the hook slightly.  A good portion of
arch/arm/cpu/armv7/virt-dt.c is common looking and I hope that when PSCI
is needed on ARMv8 we can re-use this by and large.  So rename the
current hook to psci_update_dt(), move the prototype to <asm/psci.h> and
add an #ifdef that will make re-use later easier.

Reported-by: York Sun <yorksun@freescale.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: York Sun <yorksun@freescale.com>
Cc: Ian Campbell <ijc@hellion.org.uk>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Albert ARIBAUD <albert.u.boot@aribaud.net>
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: York Sun <yorksun@freescale.com>

arch/arm/cpu/armv7/virt-dt.c

@@ -88,10 +88,12 @@ static int fdt_psci(void *fdt)
 	return 0;
 }
 
-int armv7_update_dt(void *fdt)
+int psci_update_dt(void *fdt)
 {
+#if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 	if (!armv7_boot_nonsec())
 		return 0;
+#endif
 #ifndef CONFIG_ARMV7_SECURE_BASE
 	/* secure code lives in RAM, keep it alive */
 	fdt_add_mem_rsv(fdt, (unsigned long)__secure_start,

arch/arm/include/asm/armv7.h

@@ -124,7 +124,6 @@ void v7_outer_cache_inval_range(u32 start, u32 end);
 #if defined(CONFIG_ARMV7_NONSEC) || defined(CONFIG_ARMV7_VIRT)
 
 int armv7_init_nonsec(void);
-int armv7_update_dt(void *fdt);
 bool armv7_boot_nonsec(void);
 
 /* defined in assembly file */

arch/arm/include/asm/psci.h

@@ -32,4 +32,8 @@
 #define ARM_PSCI_RET_INVAL		(-2)
 #define ARM_PSCI_RET_DENIED		(-3)
 
+#ifndef __ASSEMBLY__
+int psci_update_dt(void *fdt);
+#endif /* ! __ASSEMBLY__ */
+
 #endif /* __ARM_PSCI_H__ */

arch/arm/lib/bootm-fdt.c

@@ -17,7 +17,7 @@
 
 #include <common.h>
 #include <fdt_support.h>
-#include <asm/armv7.h>
+#include <asm/psci.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -38,7 +38,7 @@ int arch_fixup_fdt(void *blob)
 	if (ret)
 		return ret;
 
-	ret = armv7_update_dt(blob);
+	ret = psci_update_dt(blob);
 #endif
 	return ret;
 }