[PATCH 05/19] ARM: OMAP4: PM: Add SAR backup support towards device OFF

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From: Santosh Shilimkar <santosh.shilimkar@xxxxxx>

The SAR RAM is maintained during Device OFF mode. The register layout
is fixed in SAR ROM. SAR is split into 4 banks with different
privilege accesses based on device type

 ---------------------------------------------------------------
 Access mode		Bank	Address Range
 ---------------------------------------------------------------
 HS/GP : Public		1	0x4A32_6000 - 0x4A32_6FFF (4kB)
 HS/GP : Public		2	0x4A32_7000 - 0x4A32_73FF (1kB)

 HS/EMU : Secured
 GP : Public		3	0x4A32_8000 - 0x4A32_87FF (2kB)

 HS/GP :Secure
 write once.		4	0x4A32_9000 - 0x4A32_93FF (1kB)
 ---------------------------------------------------------------

The save process is done entirely by software and restore is done by
hardware using the auto-restore feature. The restore feature is enabled
by default and cannot be disabled. The software must save the data
to be restored in a dedicated location in SAR RAM.

[with contributions for 4460, cleanups from:
Rajeev Kulkarni <rajeevk@xxxxxx>
Nishanth Menon <nm@xxxxxx>
Axel Haslam <axelhaslam@xxxxxxxxx>
Avinash.H.M <avinashhm@xxxxxx>]
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
[t-kristo@xxxxxx: dropped huge data tables as they are no longer needed
 with subsequent patches that generate the layouts based on SAR ROM
 contents, also dropped unnecessary dmm-44xx.h header file.]
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
 arch/arm/mach-omap2/Makefile               |    2 +-
 arch/arm/mach-omap2/cm1_44xx.h             |    2 +
 arch/arm/mach-omap2/cm2_44xx.h             |    2 +
 arch/arm/mach-omap2/omap-sar.c             |  341 ++++++++++++++++++++++++++++
 arch/arm/mach-omap2/omap4-common.c         |   28 ---
 arch/arm/mach-omap2/omap4-sar-layout.h     |   50 ++++
 arch/arm/mach-omap2/pm.h                   |   12 +
 arch/arm/plat-omap/include/plat/omap44xx.h |    5 +
 8 files changed, 413 insertions(+), 29 deletions(-)
 create mode 100644 arch/arm/mach-omap2/omap-sar.c

diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 49f92bc..a978679 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -27,7 +27,7 @@ obj-$(CONFIG_TWL4030_CORE) += omap_twl.o
 obj-$(CONFIG_SMP)			+= omap-smp.o omap-headsmp.o
 obj-$(CONFIG_HOTPLUG_CPU)		+= omap-hotplug.o
 obj-$(CONFIG_ARCH_OMAP4)		+= omap4-common.o omap-wakeupgen.o \
-					   sleep44xx.o
+					   sleep44xx.o omap-sar.o
 
 plus_sec := $(call as-instr,.arch_extension sec,+sec)
 AFLAGS_omap-headsmp.o			:=-Wa,-march=armv7-a$(plus_sec)
diff --git a/arch/arm/mach-omap2/cm1_44xx.h b/arch/arm/mach-omap2/cm1_44xx.h
index 1bc00dc..c21b660 100644
--- a/arch/arm/mach-omap2/cm1_44xx.h
+++ b/arch/arm/mach-omap2/cm1_44xx.h
@@ -218,8 +218,10 @@
 #define OMAP4430_CM1_ABE_WDT3_CLKCTRL			OMAP44XX_CM1_REGADDR(OMAP4430_CM1_ABE_INST, 0x0088)
 
 /* Function prototypes */
+#ifndef __ASSEMBLER__
 extern u32 omap4_cm1_read_inst_reg(s16 inst, u16 idx);
 extern void omap4_cm1_write_inst_reg(u32 val, s16 inst, u16 idx);
 extern u32 omap4_cm1_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx);
+#endif
 
 #endif
diff --git a/arch/arm/mach-omap2/cm2_44xx.h b/arch/arm/mach-omap2/cm2_44xx.h
index b9de72d..3e8871e 100644
--- a/arch/arm/mach-omap2/cm2_44xx.h
+++ b/arch/arm/mach-omap2/cm2_44xx.h
@@ -450,8 +450,10 @@
 #define OMAP4430_CM_CEFUSE_CEFUSE_CLKCTRL		OMAP44XX_CM2_REGADDR(OMAP4430_CM2_CEFUSE_INST, 0x0020)
 
 /* Function prototypes */
+#ifndef __ASSEMBLER__
 extern u32 omap4_cm2_read_inst_reg(s16 inst, u16 idx);
 extern void omap4_cm2_write_inst_reg(u32 val, s16 inst, u16 idx);
 extern u32 omap4_cm2_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 idx);
+#endif
 
 #endif
diff --git a/arch/arm/mach-omap2/omap-sar.c b/arch/arm/mach-omap2/omap-sar.c
new file mode 100644
index 0000000..74e0207
--- /dev/null
+++ b/arch/arm/mach-omap2/omap-sar.c
@@ -0,0 +1,341 @@
+/*
+ * OMAP4 Save Restore source file
+ *
+ * Copyright (C) 2010 Texas Instruments, Inc.
+ * Written by 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+
+#include "iomap.h"
+#include "pm.h"
+#include "clockdomain.h"
+
+#include "omap4-sar-layout.h"
+#include "cm-regbits-44xx.h"
+#include "prcm44xx.h"
+#include "cminst44xx.h"
+
+static void __iomem *sar_ram_base;
+static void __iomem *omap4_sar_modules[MAX_SAR_MODULES];
+static struct powerdomain *l3init_pwrdm;
+	static struct clockdomain *l3init_clkdm;
+static struct clk *usb_host_ck, *usb_tll_ck;
+
+/*
+ * SAR_RAM1 register layout consist of EMIF1, EMIF2, CM1, CM2,
+ * CONTROL_CORE efuse, DMM and USB TLL registers.
+ * The layout is arranged is a two dimentional array like
+ * below,
+ * const u32 sar_ramX_layout[nb_regs_sets][4] = {
+ *	{module_index, reg_offset, size, sar_ram_offset},
+ * }
+ */
+static const u32 omap443x_sar_ram1_layout[][4] = {
+};
+
+/*
+ * SAR_RAM2 register layout consist of SYSCTRL_PADCONF_CORE regsiters
+ */
+static const u32 omap443x_sar_ram2_layout[][4] = {
+};
+
+/*
+ * SAR_RAM3 and  SAR_RAM4 layout is not listed since moslty it's handle by
+ * secure software.
+ */
+static const u32 omap443x_sar_ram3_layout[][4] = {
+};
+
+/*
+ * omap_sar_save :
+ * common routine to save the registers to  SAR RAM with the
+ * given parameters
+ * @nb_regs - Number of registers to saved
+ * @sar_bank_offset - where to backup
+ * @sar_layout - constant table containing the backup info
+ */
+static void sar_save(u32 nb_regs, u32 sar_bank, const u32 sar_layout_table[][4])
+{
+	u32 reg_val, size, i, j;
+	void __iomem *reg_read_addr, *sar_wr_addr;
+
+	for (i = 0; i < nb_regs; i++) {
+		if (omap4_sar_modules[(sar_layout_table[i][MODULE_ADDR_IDX])]) {
+			size = sar_layout_table[i][MODULE_NB_REGS_IDX];
+			reg_read_addr =
+			    omap4_sar_modules[sar_layout_table[i]
+					      [MODULE_ADDR_IDX]]
+			    + sar_layout_table[i][MODULE_OFFSET_IDX];
+			sar_wr_addr = sar_ram_base + sar_bank +
+			    sar_layout_table[i][SAR_RAM_OFFSET_IDX];
+			for (j = 0; j < size; j++) {
+				reg_val = __raw_readl(reg_read_addr + j * 4);
+				__raw_writel(reg_val, sar_wr_addr + j * 4);
+			}
+		}
+	}
+}
+
+static void save_sar_bank3(void)
+{
+	struct clockdomain *l4_secure_clkdm;
+
+	/*
+	 * Not supported on ES1.0 silicon
+	 */
+	if (omap_rev() == OMAP4430_REV_ES1_0) {
+		WARN_ONCE(1, "omap4: SAR backup not supported on ES1.0 ..\n");
+		return;
+	}
+
+	l4_secure_clkdm = clkdm_lookup("l4_secure_clkdm");
+	clkdm_wakeup(l4_secure_clkdm);
+
+	sar_save(ARRAY_SIZE(omap443x_sar_ram3_layout), SAR_BANK3_OFFSET,
+		 omap443x_sar_ram3_layout);
+
+	clkdm_allow_idle(l4_secure_clkdm);
+}
+
+static int omap4_sar_not_accessible(void)
+{
+	u32 usbhost_state, usbtll_state;
+
+	/*
+	 * Make sure that USB host and TLL modules are not
+	 * enabled before attempting to save the context
+	 * registers, otherwise this will trigger an exception.
+	 */
+	usbhost_state = omap4_cminst_read_inst_reg(OMAP4430_CM2_PARTITION,
+						   OMAP4430_CM2_L3INIT_INST,
+						   OMAP4_CM_L3INIT_USB_HOST_CLKCTRL_OFFSET)
+	    & (OMAP4430_STBYST_MASK | OMAP4430_IDLEST_MASK);
+
+	usbtll_state = omap4_cminst_read_inst_reg(OMAP4430_CM2_PARTITION,
+						  OMAP4430_CM2_L3INIT_INST,
+						  OMAP4_CM_L3INIT_USB_TLL_CLKCTRL_OFFSET)
+	    & OMAP4430_IDLEST_MASK;
+
+	if ((usbhost_state == (OMAP4430_STBYST_MASK | OMAP4430_IDLEST_MASK)) &&
+	    (usbtll_state == (OMAP4430_IDLEST_MASK)))
+		return 0;
+	else
+		return -EBUSY;
+}
+
+ /*
+  * omap4_sar_save -
+  * Save the context to SAR_RAM1 and SAR_RAM2 as per
+  * omap4xxx_sar_ram1_layout and omap4xxx_sar_ram2_layout for the device OFF
+  * mode
+  */
+int omap4_sar_save(void)
+{
+	/*
+	 * Not supported on ES1.0 silicon
+	 */
+	if (omap_rev() == OMAP4430_REV_ES1_0) {
+		WARN_ONCE(1, "omap4: SAR backup not supported on ES1.0 ..\n");
+		return -ENODEV;
+	}
+
+	if (omap4_sar_not_accessible()) {
+		pr_debug("%s: USB SAR CNTX registers are not accessible!\n",
+			 __func__);
+		return -EBUSY;
+	}
+
+	/*
+	 * SAR bits and clocks needs to be enabled
+	 */
+	clkdm_wakeup(l3init_clkdm);
+	pwrdm_enable_hdwr_sar(l3init_pwrdm);
+	clk_enable(usb_host_ck);
+	clk_enable(usb_tll_ck);
+
+	/* Save SAR BANK1 */
+	sar_save(ARRAY_SIZE(omap443x_sar_ram1_layout), SAR_BANK1_OFFSET,
+		 omap443x_sar_ram1_layout);
+
+	clk_disable(usb_host_ck);
+	clk_disable(usb_tll_ck);
+	pwrdm_disable_hdwr_sar(l3init_pwrdm);
+	clkdm_allow_idle(l3init_clkdm);
+
+	/* Save SAR BANK2 */
+	sar_save(ARRAY_SIZE(omap443x_sar_ram2_layout), SAR_BANK2_OFFSET,
+		 omap443x_sar_ram2_layout);
+
+	return 0;
+}
+
+/**
+ * omap4_sar_overwrite :
+ * This API overwrite some of the SAR locations as a special cases
+ * The register content to be saved can be the register value before
+ * going into OFF-mode or a value that is required on wake up. This means
+ * that the restored register value can be different from the last value
+ * of the register before going into OFF-mode
+ *	- CM1 and CM2 configuration
+ *		Bits 0 of the CM_SHADOW_FREQ_CONFIG1 regiser and the
+ *		CM_SHADOW_FREQ_CONFIG2 register are self-clearing and must
+ *		 be set at restore time. Thus, these data must always be
+ *		overwritten in the SAR RAM.
+ *	- Because USBHOSTHS and USBTLL restore needs a particular
+ *		sequencing, the software must overwrite data read from
+ *		the following registers implied in phase2a and phase 2b
+ */
+void omap4_sar_overwrite(void)
+{
+	u32 val = 0;
+	u32 offset = 0;
+
+	if (cpu_is_omap446x())
+		offset = 0x04;
+
+	/* Overwriting Phase1 data to be restored */
+	/* CM2 MEMIF_CLKTRCTRL = SW_WKUP, before FREQ UPDATE */
+	__raw_writel(0x2, sar_ram_base + SAR_BANK1_OFFSET + 0xd0);
+	/* CM1 CM_SHADOW_FREQ_CONFIG2, Enable FREQ UPDATE */
+	val = __raw_readl(OMAP4430_CM_SHADOW_FREQ_CONFIG2);
+	/*
+	 * FIXME: Implement FREQ UPDATE for L#/M5 before enabling this
+	 * val |= 1 << OMAP4430_FREQ_UPDATE_SHIFT;
+	 */
+	__raw_writel(val, sar_ram_base + SAR_BANK1_OFFSET + 0x100);
+	/* CM1 CM_SHADOW_FREQ_CONFIG1, Enable FREQ UPDATE */
+	val = __raw_readl(OMAP4430_CM_SHADOW_FREQ_CONFIG1);
+	val |= 1 << OMAP4430_FREQ_UPDATE_SHIFT;
+	val &= ~OMAP4430_DLL_OVERRIDE_MASK;
+	__raw_writel(val, sar_ram_base + SAR_BANK1_OFFSET + 0x104);
+	/* CM2 MEMIF_CLKTRCTRL = HW_AUTO, after FREQ UPDATE */
+	__raw_writel(0x3, sar_ram_base + SAR_BANK1_OFFSET + 0x124);
+
+	/* Overwriting Phase2a data to be restored */
+	/* CM_L3INIT_USB_HOST_CLKCTRL: SAR_MODE = 1, MODULEMODE = 2 */
+	__raw_writel(0x00000012,
+		     sar_ram_base + SAR_BANK1_OFFSET + 0x2ec + offset);
+	/* CM_L3INIT_USB_TLL_CLKCTRL: SAR_MODE = 1, MODULEMODE = 1 */
+	__raw_writel(0x00000011,
+		     sar_ram_base + SAR_BANK1_OFFSET + 0x2f0 + offset);
+	/* CM2 CM_SDMA_STATICDEP : Enable static depedency for SAR modules */
+	__raw_writel(0x000090e8,
+		     sar_ram_base + SAR_BANK1_OFFSET + 0x2f4 + offset);
+
+	/* Overwriting Phase2b data to be restored */
+	/* CM_L3INIT_USB_HOST_CLKCTRL: SAR_MODE = 0, MODULEMODE = 0 */
+	val = __raw_readl(OMAP4430_CM_L3INIT_USB_HOST_CLKCTRL);
+	val &= (OMAP4430_CLKSEL_UTMI_P1_MASK | OMAP4430_CLKSEL_UTMI_P2_MASK);
+	__raw_writel(val, sar_ram_base + SAR_BANK1_OFFSET + 0x91c + offset);
+	/* CM_L3INIT_USB_TLL_CLKCTRL: SAR_MODE = 0, MODULEMODE = 0 */
+	__raw_writel(0x0000000,
+		     sar_ram_base + SAR_BANK1_OFFSET + 0x920 + offset);
+	/* CM2 CM_SDMA_STATICDEP : Clear the static depedency */
+	__raw_writel(0x00000040,
+		     sar_ram_base + SAR_BANK1_OFFSET + 0x924 + offset);
+
+	/* readback to ensure data reaches to SAR RAM */
+	barrier();
+	val = __raw_readl(sar_ram_base + SAR_BANK1_OFFSET + 0x924 + offset);
+}
+
+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 -ENODEV;
+
+	/*
+	 * Static mapping, never released Actual SAR area used is 8K it's
+	 * spaced over 16K address with some part is reserved.
+	 */
+	sar_ram_base = ioremap(OMAP44XX_SAR_RAM_BASE, SZ_16K);
+	BUG_ON(!sar_ram_base);
+
+	/*
+	 * All these are static mappings so ioremap() will
+	 * just return with mapped VA
+	 */
+	omap4_sar_modules[EMIF1_INDEX] = ioremap(OMAP44XX_EMIF1_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[EMIF1_INDEX]);
+	omap4_sar_modules[EMIF2_INDEX] = ioremap(OMAP44XX_EMIF2_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[EMIF2_INDEX]);
+	omap4_sar_modules[DMM_INDEX] = ioremap(OMAP44XX_DMM_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[DMM_INDEX]);
+	omap4_sar_modules[CM1_INDEX] = ioremap(OMAP4430_CM1_BASE, SZ_8K);
+	BUG_ON(!omap4_sar_modules[CM1_INDEX]);
+	omap4_sar_modules[CM2_INDEX] = ioremap(OMAP4430_CM2_BASE, SZ_8K);
+	BUG_ON(!omap4_sar_modules[CM2_INDEX]);
+	omap4_sar_modules[C2C_INDEX] = ioremap(OMAP44XX_C2C_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[C2C_INDEX]);
+	omap4_sar_modules[CTRL_MODULE_PAD_CORE_INDEX] =
+	    ioremap(OMAP443X_CTRL_BASE, SZ_4K);
+	BUG_ON(!omap4_sar_modules[CTRL_MODULE_PAD_CORE_INDEX]);
+	omap4_sar_modules[L3_CLK1_INDEX] = ioremap(L3_44XX_BASE_CLK1, SZ_1M);
+	BUG_ON(!omap4_sar_modules[L3_CLK1_INDEX]);
+	omap4_sar_modules[L3_CLK2_INDEX] = ioremap(L3_44XX_BASE_CLK2, SZ_1M);
+	BUG_ON(!omap4_sar_modules[L3_CLK2_INDEX]);
+	omap4_sar_modules[L3_CLK3_INDEX] = ioremap(L3_44XX_BASE_CLK3, SZ_1M);
+	BUG_ON(!omap4_sar_modules[L3_CLK3_INDEX]);
+	omap4_sar_modules[USBTLL_INDEX] = ioremap(OMAP44XX_USBTLL_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[USBTLL_INDEX]);
+	omap4_sar_modules[UHH_INDEX] = ioremap(OMAP44XX_UHH_CONFIG_BASE, SZ_1M);
+	BUG_ON(!omap4_sar_modules[UHH_INDEX]);
+	omap4_sar_modules[L4CORE_INDEX] = ioremap(L4_44XX_PHYS, SZ_4M);
+	BUG_ON(!omap4_sar_modules[L4CORE_INDEX]);
+	omap4_sar_modules[L4PER_INDEX] = ioremap(L4_PER_44XX_PHYS, SZ_4M);
+	BUG_ON(!omap4_sar_modules[L4PER_INDEX]);
+
+	/*
+	 * SAR BANK3 contains all firewall settings and it's saved through
+	 * secure API on HS device. On GP device these registers are
+	 * meaningless but still needs to be saved. Otherwise Auto-restore
+	 * phase DMA takes an abort. Hence save these conents only once
+	 * in init to avoid the issue while waking up from device OFF
+	 */
+	if (omap_type() == OMAP2_DEVICE_TYPE_GP)
+		save_sar_bank3();
+
+	/*
+	 * L3INIT PD and clocks are needed for SAR save phase
+	 */
+	l3init_pwrdm = pwrdm_lookup("l3init_pwrdm");
+	if (!l3init_pwrdm)
+		pr_err("Failed to get l3init_pwrdm\n");
+
+	l3init_clkdm = clkdm_lookup("l3_init_clkdm");
+	if (!l3init_clkdm)
+		pr_err("Failed to get l3_init_clkdm\n");
+
+	usb_host_ck = clk_get_sys("usbhs_omap", "hs_fck");
+	if (IS_ERR(usb_host_ck))
+		pr_err("Could not get usb_host_ck\n");
+
+	usb_tll_ck = clk_get_sys("usbhs_omap", "usbtll_ick");
+	if (IS_ERR(usb_tll_ck))
+		pr_err("Could not get usb_tll_ck\n");
+
+	return 0;
+}
+early_initcall(omap4_sar_ram_init);
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index cc6a915..7ea4652 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -37,7 +37,6 @@
 static void __iomem *l2cache_base;
 #endif
 
-static void __iomem *sar_ram_base;
 static void __iomem *gic_dist_base_addr;
 
 #ifdef CONFIG_OMAP4_ERRATA_I688
@@ -186,30 +185,3 @@ 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
index fe5b545..eef2839 100644
--- a/arch/arm/mach-omap2/omap4-sar-layout.h
+++ b/arch/arm/mach-omap2/omap4-sar-layout.h
@@ -11,6 +11,56 @@
 #ifndef OMAP_ARCH_OMAP4_SAR_LAYOUT_H
 #define OMAP_ARCH_OMAP4_SAR_LAYOUT_H
 
+#include <mach/hardware.h>
+#include <mach/ctrl_module_pad_core_44xx.h>
+
+#include "cm1_44xx.h"
+#include "cm2_44xx.h"
+#include "prcm-common.h"
+
+/*
+ * The SAR RAM is maintained during Device OFF mode.
+ * It is split into 4 banks with different privilege accesses
+ *
+ * ---------------------------------------------------------------------
+ * Access mode			Bank	Address Range
+ * ---------------------------------------------------------------------
+ * HS/GP : Public		1	0x4A32_6000 - 0x4A32_6FFF (4kB)
+ * HS/GP : Public, Secured
+ * if padconfaccdisable=1	2	0x4A32_7000 - 0x4A32_73FF (1kB)
+ * HS/EMU : Secured
+ * GP : Public			3	0x4A32_8000 - 0x4A32_87FF (2kB)
+ * HS/GP :
+ * Secure Priviledge,
+ * write once.			4	0x4A32_9000 - 0x4A32_93FF (1kB)
+ * ---------------------------------------------------------------------
+ * The SAR RAM save regiter layout is fixed since restore is done by hardware.
+ */
+
+#define MODULE_ADDR_IDX				0
+#define MODULE_OFFSET_IDX			1
+#define MODULE_NB_REGS_IDX			2
+#define SAR_RAM_OFFSET_IDX			3
+
+/*
+ * Module Index used to lookup VA using index
+ */
+#define MAX_SAR_MODULES				14
+#define EMIF1_INDEX				0
+#define EMIF2_INDEX				1
+#define DMM_INDEX				2
+#define CM1_INDEX				3
+#define CM2_INDEX				4
+#define C2C_INDEX				5
+#define CTRL_MODULE_PAD_CORE_INDEX		6
+#define L3_CLK1_INDEX				7
+#define L3_CLK2_INDEX				8
+#define L3_CLK3_INDEX				9
+#define USBTLL_INDEX				10
+#define UHH_INDEX				11
+#define L4CORE_INDEX				12
+#define L4PER_INDEX				13
+
 /*
  * SAR BANK offsets from base address OMAP44XX_SAR_RAM_BASE
  */
diff --git a/arch/arm/mach-omap2/pm.h b/arch/arm/mach-omap2/pm.h
index 07ad800..c13e3c1 100644
--- a/arch/arm/mach-omap2/pm.h
+++ b/arch/arm/mach-omap2/pm.h
@@ -138,4 +138,16 @@ static inline int omap4_twl_init(void)
 }
 #endif
 
+#ifdef CONFIG_PM
+extern int omap4_sar_save(void);
+extern void omap4_sar_overwrite(void);
+#else
+static inline void omap4_sar_save(void)
+{
+}
+static inline void omap4_sar_overwrite(void)
+{
+}
+#endif
+
 #endif
diff --git a/arch/arm/plat-omap/include/plat/omap44xx.h b/arch/arm/plat-omap/include/plat/omap44xx.h
index 1a45700..8e83e16 100644
--- a/arch/arm/plat-omap/include/plat/omap44xx.h
+++ b/arch/arm/plat-omap/include/plat/omap44xx.h
@@ -22,6 +22,9 @@
 #define L4_PER_44XX_BASE		0x48000000
 #define L4_EMU_44XX_BASE		0x54000000
 #define L3_44XX_BASE			0x44000000
+#define L3_44XX_BASE_CLK1		L3_44XX_BASE
+#define L3_44XX_BASE_CLK2		0x44800000
+#define L3_44XX_BASE_CLK3		0x45000000
 #define OMAP44XX_EMIF1_BASE		0x4c000000
 #define OMAP44XX_EMIF2_BASE		0x4d000000
 #define OMAP44XX_DMM_BASE		0x4e000000
@@ -59,5 +62,7 @@
 #define OMAP44XX_HSUSB_OHCI_BASE	(L4_44XX_BASE + 0x64800)
 #define OMAP44XX_HSUSB_EHCI_BASE	(L4_44XX_BASE + 0x64C00)
 
+#define OMAP44XX_C2C_BASE		0x5c000000
+
 #endif /* __ASM_ARCH_OMAP44XX_H */
 
-- 
1.7.4.1

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