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ARM: OMAP4: PM: Add SAR RAM support

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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>
This commit is contained in:
Santosh Shilimkar 2011-01-01 19:56:04 +05:30 committed by Kevin Hilman
parent 02afe8a7f2
commit 501f0c751d
4 changed files with 54 additions and 0 deletions
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1
arch/arm/mach-omap2/common.h
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@ -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 */

30
arch/arm/mach-omap2/omap4-common.c
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@ -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);

22
arch/arm/mach-omap2/omap4-sar-layout.h Normal file
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@ -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

1
arch/arm/plat-omap/include/plat/omap44xx.h
View File

@ -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)