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@xxxxxx>
Acked-by: Jean Pihet <j-pihet@xxxxxx>
Reviewed-by: Kevin Hilman <khilman@xxxxxx>
Tested-by: Vishwanath BS <vishwanath.bs@xxxxxx>
---
arch/arm/mach-omap2/include/mach/omap4-common.h | 1 +
arch/arm/mach-omap2/omap4-common.c | 31 +++++++++++++++++++++++
arch/arm/mach-omap2/omap4-sar-layout.h | 22 ++++++++++++++++
arch/arm/plat-omap/include/plat/omap44xx.h | 1 +
4 files changed, 55 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/mach-omap2/omap4-sar-layout.h
diff --git a/arch/arm/mach-omap2/include/mach/omap4-common.h b/arch/arm/mach-omap2/include/mach/omap4-common.h
index b28ad10..947d0c8 100644
--- a/arch/arm/mach-omap2/include/mach/omap4-common.h
+++ b/arch/arm/mach-omap2/include/mach/omap4-common.h
@@ -39,6 +39,7 @@ 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 a12896a..652e319 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -24,12 +24,16 @@
#include <mach/hardware.h>
#include <mach/omap4-common.h>
+#include "omap4-sar-layout.h"
+
#ifdef CONFIG_CACHE_L2X0
static void __iomem *l2cache_base;
#endif
void __iomem *gic_dist_base_addr;
+static void __iomem *sar_ram_base;
+
void __init gic_init_irq(void)
{
@@ -117,3 +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_8K);
+ 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 0000000..7781ea4
--- /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@xxxxxx>
+ *
+ * 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 ea2b8a6..c0d478e 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)
--
1.7.4.1
--
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