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authorMagnus Damm <damm@opensource.se>2013-07-31 11:07:12 +0400
committerSimon Horman <horms+renesas@verge.net.au>2013-08-06 13:07:24 +0400
commitc970d4ef3ac6d56f5fd02902ad2ad80377c0bca1 (patch)
treee65617739137b1a044c214afcff595a07a88737e /arch/arm/mach-shmobile/platsmp-scu.c
parent8b3e32c1fe5dce55e28e76b20361841dc863ec17 (diff)
downloadlinux-c970d4ef3ac6d56f5fd02902ad2ad80377c0bca1.tar.xz
ARM: shmobile: Introduce shared SCU SMP boot code
Add SMP boot functions for SCU equipped mach-shmobile SoCs. At this point shmobile_smp_scu_prepare_cpus() controls the SCU and installs boot fn and arg, while shmobile_smp_scu_boot_secondary() currently does nothing. In the future the boot function and arg install code will be reworked, so the empty function is ground work for that. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'arch/arm/mach-shmobile/platsmp-scu.c')
-rw-r--r--arch/arm/mach-shmobile/platsmp-scu.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/platsmp-scu.c b/arch/arm/mach-shmobile/platsmp-scu.c
new file mode 100644
index 000000000000..8f478e4d4964
--- /dev/null
+++ b/arch/arm/mach-shmobile/platsmp-scu.c
@@ -0,0 +1,31 @@
+/*
+ * SMP support for SoCs with SCU covered by mach-shmobile
+ *
+ * Copyright (C) 2013 Magnus Damm
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/smp.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+#include <mach/common.h>
+
+void __init shmobile_smp_scu_prepare_cpus(unsigned int max_cpus)
+{
+ shmobile_boot_fn = virt_to_phys(shmobile_boot_scu);
+ shmobile_boot_arg = (unsigned long)shmobile_scu_base;
+
+ /* enable SCU and cache coherency on booting CPU */
+ scu_enable(shmobile_scu_base);
+ scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
+}
+
+int shmobile_smp_scu_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ /* do nothing for now */
+ return 0;
+}