summaryrefslogtreecommitdiffstats
path: root/arch/arm
diff options
context:
space:
mode:
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
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')
-rw-r--r--arch/arm/mach-omap2/common.h1
-rw-r--r--arch/arm/mach-omap2/omap4-common.c30
-rw-r--r--arch/arm/mach-omap2/omap4-sar-layout.h22
-rw-r--r--arch/arm/plat-omap/include/plat/omap44xx.h1
4 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h
index ca04152a919..7ebcb6a9b73 100644
--- a/arch/arm/mach-omap2/common.h
+++ b/arch/arm/mach-omap2/common.h
@@ -182,6 +182,7 @@ static inline void __iomem *omap4_get_scu_base(void)
extern void __init gic_init_irq(void);
extern void omap_smc1(u32 fn, u32 arg);
+extern void __iomem *omap4_get_sar_ram_base(void);
#ifdef CONFIG_SMP
/* Needed for secondary core boot */
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 4a3d2898543..2489f5b8b98 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);
diff --git a/arch/arm/mach-omap2/omap4-sar-layout.h b/arch/arm/mach-omap2/omap4-sar-layout.h
new file mode 100644
index 00000000000..7781ea4dacb
--- /dev/null
+++ b/arch/arm/mach-omap2/omap4-sar-layout.h
@@ -0,0 +1,22 @@
+/*
+ * omap4-sar-layout.h: OMAP4 SAR RAM layout header file
+ *
+ * Copyright (C) 2011 Texas Instruments, Inc.
+ * Santosh Shilimkar <santosh.shilimkar@ti.com>
+ *
+ * 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.
+ */
+#ifndef OMAP_ARCH_OMAP4_SAR_LAYOUT_H
+#define OMAP_ARCH_OMAP4_SAR_LAYOUT_H
+
+/*
+ * SAR BANK offsets from base address OMAP44XX_SAR_RAM_BASE
+ */
+#define SAR_BANK1_OFFSET 0x0000
+#define SAR_BANK2_OFFSET 0x1000
+#define SAR_BANK3_OFFSET 0x2000
+#define SAR_BANK4_OFFSET 0x3000
+
+#endif
diff --git a/arch/arm/plat-omap/include/plat/omap44xx.h b/arch/arm/plat-omap/include/plat/omap44xx.h
index ea2b8a6306e..c0d478e55c8 100644
--- a/arch/arm/plat-omap/include/plat/omap44xx.h
+++ b/arch/arm/plat-omap/include/plat/omap44xx.h
@@ -45,6 +45,7 @@
#define OMAP44XX_WKUPGEN_BASE 0x48281000
#define OMAP44XX_MCPDM_BASE 0x40132000
#define OMAP44XX_MCPDM_L3_BASE 0x49032000
+#define OMAP44XX_SAR_RAM_BASE 0x4a326000
#define OMAP44XX_MAILBOX_BASE (L4_44XX_BASE + 0xF4000)
#define OMAP44XX_HSUSB_OTG_BASE (L4_44XX_BASE + 0xAB000)