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Commit 501f0c75 authored by Santosh Shilimkar's avatar Santosh Shilimkar Committed by Kevin Hilman
Browse files

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: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: default avatarJean Pihet <j-pihet@ti.com>
Reviewed-by: default avatarKevin Hilman <khilman@ti.com>
Tested-by: default avatarVishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: default avatarKevin Hilman <khilman@ti.com>
parent 02afe8a7

arch/arm/mach-omap2/common.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */

arch/arm/mach-omap2/omap4-common.c

+30 −0
Original line number Diff line number Diff line
@@ -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);

arch/arm/mach-omap2/omap4-sar-layout.h

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * 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

arch/arm/plat-omap/include/plat/omap44xx.h

+1 −0
Original line number Diff line number Diff line
@@ -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)