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| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2011-01-01 15:26:04 +0100 |
|---|---|---|
| committer | Kevin Hilman <khilman@ti.com> | 2011-12-08 20:28:59 +0100 |
| commit | 501f0c751de06d8484b4279131c26f58bd49a69d (patch) | |
| tree | b993d2a9ad7df11dbde65e41ee0dc8d4e444113b | |
| parent | ARM: OMAP4: Export omap4_get_base*() rather than global address pointers (diff) | |
| download | linux-501f0c751de06d8484b4279131c26f58bd49a69d.tar.xz linux-501f0c751de06d8484b4279131c26f58bd49a69d.zip | |
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>
| -rw-r--r-- | arch/arm/mach-omap2/common.h | 1 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/omap4-common.c | 30 | ||||
| -rw-r--r-- | arch/arm/mach-omap2/omap4-sar-layout.h | 22 | ||||
| -rw-r--r-- | arch/arm/plat-omap/include/plat/omap44xx.h | 1 |
4 files changed, 54 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/common.h b/arch/arm/mach-omap2/common.h index ca04152a9199..7ebcb6a9b73e 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 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); 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 000000000000..7781ea4dacbc --- /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 ea2b8a6306e7..c0d478e55c84 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) |