[RFC v3 12/25] ARM: shmobile: rcar-gen2: Add watchdog support

[Fabrizio Castro]

This patch adds watchdog support by installing shmobile_boot_vector_gen2
to ICRAM1 when enough memory is available, in which case we also keep a
copy of MPIDR to complete the reset vector logic.

Signed-off-by: Fabrizio Castro <fabrizio.castro at bp.renesas.com>
Signed-off-by: Ramesh Shanmugasundaram <ramesh.shanmugasundaram at bp.renesas.com>
---
v2->v3:
* purge shmobile_wdt_clock status and save mpidr of boot cpu

v1->v2:
* make the reset vector backward compatible

 arch/arm/mach-shmobile/platsmp-apmu.c |  1 +
 arch/arm/mach-shmobile/pm-rcar-gen2.c | 13 ++++++++++---
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-shmobile/platsmp-apmu.c b/arch/arm/mach-shmobile/platsmp-apmu.c
index 4422b61..ba732ef 100644
--- a/arch/arm/mach-shmobile/platsmp-apmu.c
+++ b/arch/arm/mach-shmobile/platsmp-apmu.c
@@ -191,6 +191,7 @@ static void __init shmobile_smp_apmu_setup_boot(void)
 {
 	/* install boot code shared by all CPUs */
 	shmobile_boot_fn = __pa_symbol(shmobile_smp_boot);
+	shmobile_boot_fn_gen2 = shmobile_boot_fn;
 }
 
 void __init shmobile_smp_apmu_prepare_cpus(unsigned int max_cpus,
diff --git a/arch/arm/mach-shmobile/pm-rcar-gen2.c b/arch/arm/mach-shmobile/pm-rcar-gen2.c
index e5f215c..bfad202 100644
--- a/arch/arm/mach-shmobile/pm-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/pm-rcar-gen2.c
@@ -17,6 +17,7 @@
 #include <linux/smp.h>
 #include <linux/soc/renesas/rcar-sysc.h>
 #include <asm/io.h>
+#include <asm/cputype.h>
 #include "common.h"
 #include "rcar-gen2.h"
 
@@ -37,7 +38,6 @@
 #define CA7RESCNT_CODE	0x5a5a0000
 #define CA7RESCNT_CPUS	0xf		/* CPU0-3 */
 
-
 /* On-chip RAM */
 #define ICRAM1		0xe63c0000	/* Inter Connect RAM1 (4 KiB) */
 
@@ -119,8 +119,15 @@ void __init rcar_gen2_pm_init(void)
 	p = ioremap(res.start, resource_size(&res));
 	if (!p)
 		return;
-
-	memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
+	/* install the reset vector, use the largest version if we have enough
+	 * memory available */
+	if (resource_size(&res) >= shmobile_boot_size_gen2) {
+		shmobile_boot_cpu_gen2 = read_cpuid_mpidr();
+		memcpy_toio(p, shmobile_boot_vector_gen2,
+			    shmobile_boot_size_gen2);
+	} else {
+		memcpy_toio(p, shmobile_boot_vector, shmobile_boot_size);
+	}
 	iounmap(p);
 
 	/* setup reset vectors */
-- 
2.7.4