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authorSantosh Shilimkar <santosh.shilimkar@ti.com>2011-01-01 19:56:04 +0530
committerKevin Hilman <khilman@ti.com>2011-12-08 11:28:59 -0800
commit501f0c751de06d8484b4279131c26f58bd49a69d (patch)
treeb993d2a9ad7df11dbde65e41ee0dc8d4e444113b /arch/arm/mach-omap2/omap4-common.c
parent02afe8a7f23d562cec76743ae34c4735d2819345 (diff)
ARM: OMAP4: PM: Add SAR RAM support
This patch adds SAR RAM support on OMAP4430. SAR RAM used to save and restore the HW context in low power modes. Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Jean Pihet <j-pihet@ti.com> Reviewed-by: Kevin Hilman <khilman@ti.com> Tested-by: Vishwanath BS <vishwanath.bs@ti.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/omap4-common.c')
-rw-r--r--arch/arm/mach-omap2/omap4-common.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 4a3d2898543b..2489f5b8b983 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -24,11 +24,14 @@
#include <mach/hardware.h>
#include "common.h"
+#include "omap4-sar-layout.h"
#ifdef CONFIG_CACHE_L2X0
static void __iomem *l2cache_base;
#endif
+static void __iomem *sar_ram_base;
+
void __init gic_init_irq(void)
{
void __iomem *omap_irq_base;
@@ -118,3 +121,30 @@ static int __init omap_l2_cache_init(void)
}
early_initcall(omap_l2_cache_init);
#endif
+
+void __iomem *omap4_get_sar_ram_base(void)
+{
+ return sar_ram_base;
+}
+
+/*
+ * SAR RAM used to save and restore the HW
+ * context in low power modes
+ */
+static int __init omap4_sar_ram_init(void)
+{
+ /*
+ * To avoid code running on other OMAPs in
+ * multi-omap builds
+ */
+ if (!cpu_is_omap44xx())
+ return -ENOMEM;
+
+ /* Static mapping, never released */
+ sar_ram_base = ioremap(OMAP44XX_SAR_RAM_BASE, SZ_16K);
+ if (WARN_ON(!sar_ram_base))
+ return -ENOMEM;
+
+ return 0;
+}
+early_initcall(omap4_sar_ram_init);