arch/arm/mach-tegra/pm.c - kernel/lockdown - Git at Google

 /*
  * CPU complex suspend & resume functions for Tegra SoCs
  *
  * Copyright (c) 2009-2012, NVIDIA Corporation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */

 #include <linux/clk/tegra.h>
 #include <linux/cpumask.h>
 #include <linux/cpu_pm.h>
 #include <linux/delay.h>
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/suspend.h>

 #include <soc/tegra/fuse.h>
 #include <soc/tegra/pm.h>
 #include <soc/tegra/pmc.h>

 #include <asm/cacheflush.h>
 #include <asm/idmap.h>
 #include <asm/proc-fns.h>
 #include <asm/smp_plat.h>
 #include <asm/suspend.h>
 #include <asm/tlbflush.h>

 #include "flowctrl.h"
 #include "iomap.h"
 #include "pm.h"
 #include "reset.h"
 #include "sleep.h"

 #ifdef CONFIG_PM_SLEEP
 static DEFINE_SPINLOCK(tegra_lp2_lock);
 static u32 iram_save_size;
 static void *iram_save_addr;
 struct tegra_lp1_iram tegra_lp1_iram;
 void (*tegra_tear_down_cpu)(void);
 void (*tegra_sleep_core_finish)(unsigned long v2p);
 static int (*tegra_sleep_func)(unsigned long v2p);

 static void tegra_tear_down_cpu_init(void)
 {
 	switch (tegra_get_chip_id()) {
 	case TEGRA20:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
 			tegra_tear_down_cpu = tegra20_tear_down_cpu;
 		break;
 	case TEGRA30:
 	case TEGRA114:
 	case TEGRA124:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
 			tegra_tear_down_cpu = tegra30_tear_down_cpu;
 		break;
 	}
 }

 /*
  * restore_cpu_complex
  *
  * restores cpu clock setting, clears flow controller
  *
  * Always called on CPU 0.
  */
 static void restore_cpu_complex(void)
 {
 	int cpu = smp_processor_id();

 	BUG_ON(cpu != 0);

 #ifdef CONFIG_SMP
 	cpu = cpu_logical_map(cpu);
 #endif

 	/* Restore the CPU clock settings */
 	tegra_cpu_clock_resume();

 	flowctrl_cpu_suspend_exit(cpu);
 }

 /*
  * suspend_cpu_complex
  *
  * saves pll state for use by restart_plls, prepares flow controller for
  * transition to suspend state
  *
  * Must always be called on cpu 0.
  */
 static void suspend_cpu_complex(void)
 {
 	int cpu = smp_processor_id();

 	BUG_ON(cpu != 0);

 #ifdef CONFIG_SMP
 	cpu = cpu_logical_map(cpu);
 #endif

 	/* Save the CPU clock settings */
 	tegra_cpu_clock_suspend();

 	flowctrl_cpu_suspend_enter(cpu);
 }

 void tegra_clear_cpu_in_lp2(void)
 {
 	int phy_cpu_id = cpu_logical_map(smp_processor_id());
 	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;

 	spin_lock(&tegra_lp2_lock);

 	BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id)));
 	*cpu_in_lp2 &= ~BIT(phy_cpu_id);

 	spin_unlock(&tegra_lp2_lock);
 }

 bool tegra_set_cpu_in_lp2(void)
 {
 	int phy_cpu_id = cpu_logical_map(smp_processor_id());
 	bool last_cpu = false;
 	cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
 	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;

 	spin_lock(&tegra_lp2_lock);

 	BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
 	*cpu_in_lp2 |= BIT(phy_cpu_id);

 	if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
 		last_cpu = true;
 	else if (tegra_get_chip_id() == TEGRA20 && phy_cpu_id == 1)
 		tegra20_cpu_set_resettable_soon();

 	spin_unlock(&tegra_lp2_lock);
 	return last_cpu;
 }

 int tegra_cpu_do_idle(void)
 {
 	return cpu_do_idle();
 }

 static int tegra_sleep_cpu(unsigned long v2p)
 {
 	setup_mm_for_reboot();
 	tegra_sleep_cpu_finish(v2p);

 	/* should never here */
 	BUG();

 	return 0;
 }

 static void tegra_pm_set(enum tegra_suspend_mode mode)
 {
 	u32 value;

 	switch (tegra_get_chip_id()) {
 	case TEGRA20:
 	case TEGRA30:
 		break;
 	default:
 		/* Turn off CRAIL */
 		value = flowctrl_read_cpu_csr(0);
 		value &= ~FLOW_CTRL_CSR_ENABLE_EXT_MASK;
 		value |= FLOW_CTRL_CSR_ENABLE_EXT_CRAIL;
 		flowctrl_write_cpu_csr(0, value);
 		break;
 	}

 	tegra_pmc_enter_suspend_mode(mode);
 }

 void tegra_idle_lp2_last(void)
 {
 	tegra_pm_set(TEGRA_SUSPEND_LP2);

 	cpu_cluster_pm_enter();
 	suspend_cpu_complex();

 	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);

 	restore_cpu_complex();
 	cpu_cluster_pm_exit();
 }

 enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
 				enum tegra_suspend_mode mode)
 {
 	/*
 	 * The Tegra devices support suspending to LP1 or lower currently.
 	 */
 	if (mode > TEGRA_SUSPEND_LP1)
 		return TEGRA_SUSPEND_LP1;

 	return mode;
 }

 static int tegra_sleep_core(unsigned long v2p)
 {
 	setup_mm_for_reboot();
 	tegra_sleep_core_finish(v2p);

 	/* should never here */
 	BUG();

 	return 0;
 }

 /*
  * tegra_lp1_iram_hook
  *
  * Hooking the address of LP1 reset vector and SDRAM self-refresh code in
  * SDRAM. These codes not be copied to IRAM in this fuction. We need to
  * copy these code to IRAM before LP0/LP1 suspend and restore the content
  * of IRAM after resume.
  */
 static bool tegra_lp1_iram_hook(void)
 {
 	switch (tegra_get_chip_id()) {
 	case TEGRA20:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
 			tegra20_lp1_iram_hook();
 		break;
 	case TEGRA30:
 	case TEGRA114:
 	case TEGRA124:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
 			tegra30_lp1_iram_hook();
 		break;
 	default:
 		break;
 	}

 	if (!tegra_lp1_iram.start_addr || !tegra_lp1_iram.end_addr)
 		return false;

 	iram_save_size = tegra_lp1_iram.end_addr - tegra_lp1_iram.start_addr;
 	iram_save_addr = kmalloc(iram_save_size, GFP_KERNEL);
 	if (!iram_save_addr)
 		return false;

 	return true;
 }

 static bool tegra_sleep_core_init(void)
 {
 	switch (tegra_get_chip_id()) {
 	case TEGRA20:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
 			tegra20_sleep_core_init();
 		break;
 	case TEGRA30:
 	case TEGRA114:
 	case TEGRA124:
 		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
 		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
 			tegra30_sleep_core_init();
 		break;
 	default:
 		break;
 	}

 	if (!tegra_sleep_core_finish)
 		return false;

 	return true;
 }

 static void tegra_suspend_enter_lp1(void)
 {
 	/* copy the reset vector & SDRAM shutdown code into IRAM */
 	memcpy(iram_save_addr, IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
 		iram_save_size);
 	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
 		tegra_lp1_iram.start_addr, iram_save_size);

 	*((u32 *)tegra_cpu_lp1_mask) = 1;
 }

 static void tegra_suspend_exit_lp1(void)
 {
 	/* restore IRAM */
 	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA), iram_save_addr,
 		iram_save_size);

 	*(u32 *)tegra_cpu_lp1_mask = 0;
 }

 static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
 	[TEGRA_SUSPEND_NONE] = "none",
 	[TEGRA_SUSPEND_LP2] = "LP2",
 	[TEGRA_SUSPEND_LP1] = "LP1",
 	[TEGRA_SUSPEND_LP0] = "LP0",
 };

 static int tegra_suspend_enter(suspend_state_t state)
 {
 	enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();

 	if (WARN_ON(mode < TEGRA_SUSPEND_NONE ||
 		    mode >= TEGRA_MAX_SUSPEND_MODE))
 		return -EINVAL;

 	pr_info("Entering suspend state %s\n", lp_state[mode]);

 	tegra_pm_set(mode);

 	local_fiq_disable();

 	suspend_cpu_complex();
 	switch (mode) {
 	case TEGRA_SUSPEND_LP1:
 		tegra_suspend_enter_lp1();
 		break;
 	case TEGRA_SUSPEND_LP2:
 		tegra_set_cpu_in_lp2();
 		break;
 	default:
 		break;
 	}

 	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, tegra_sleep_func);

 	switch (mode) {
 	case TEGRA_SUSPEND_LP1:
 		tegra_suspend_exit_lp1();
 		break;
 	case TEGRA_SUSPEND_LP2:
 		tegra_clear_cpu_in_lp2();
 		break;
 	default:
 		break;
 	}
 	restore_cpu_complex();

 	local_fiq_enable();

 	return 0;
 }

 static const struct platform_suspend_ops tegra_suspend_ops = {
 	.valid		= suspend_valid_only_mem,
 	.enter		= tegra_suspend_enter,
 };

 void __init tegra_init_suspend(void)
 {
 	enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();

 	if (mode == TEGRA_SUSPEND_NONE)
 		return;

 	tegra_tear_down_cpu_init();

 	if (mode >= TEGRA_SUSPEND_LP1) {
 		if (!tegra_lp1_iram_hook() || !tegra_sleep_core_init()) {
 			pr_err("%s: unable to allocate memory for SDRAM"
 			       "self-refresh -- LP0/LP1 unavailable\n",
 			       __func__);
 			tegra_pmc_set_suspend_mode(TEGRA_SUSPEND_LP2);
 			mode = TEGRA_SUSPEND_LP2;
 		}
 	}

 	/* set up sleep function for cpu_suspend */
 	switch (mode) {
 	case TEGRA_SUSPEND_LP1:
 		tegra_sleep_func = tegra_sleep_core;
 		break;
 	case TEGRA_SUSPEND_LP2:
 		tegra_sleep_func = tegra_sleep_cpu;
 		break;
 	default:
 		break;
 	}

 	suspend_set_ops(&tegra_suspend_ops);
 }
 #endif
	/*
	* CPU complex suspend & resume functions for Tegra SoCs
	*
	* Copyright (c) 2009-2012, NVIDIA Corporation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include <linux/clk/tegra.h>
	#include <linux/cpumask.h>
	#include <linux/cpu_pm.h>
	#include <linux/delay.h>
	#include <linux/err.h>
	#include <linux/io.h>
	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/spinlock.h>
	#include <linux/suspend.h>

	#include <soc/tegra/fuse.h>
	#include <soc/tegra/pm.h>
	#include <soc/tegra/pmc.h>

	#include <asm/cacheflush.h>
	#include <asm/idmap.h>
	#include <asm/proc-fns.h>
	#include <asm/smp_plat.h>
	#include <asm/suspend.h>
	#include <asm/tlbflush.h>

	#include "flowctrl.h"
	#include "iomap.h"
	#include "pm.h"
	#include "reset.h"
	#include "sleep.h"

	#ifdef CONFIG_PM_SLEEP
	static DEFINE_SPINLOCK(tegra_lp2_lock);
	static u32 iram_save_size;
	static void *iram_save_addr;
	struct tegra_lp1_iram tegra_lp1_iram;
	void (*tegra_tear_down_cpu)(void);
	void (*tegra_sleep_core_finish)(unsigned long v2p);
	static int (*tegra_sleep_func)(unsigned long v2p);

	static void tegra_tear_down_cpu_init(void)
	{
	switch (tegra_get_chip_id()) {
	case TEGRA20:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
	tegra_tear_down_cpu = tegra20_tear_down_cpu;
	break;
	case TEGRA30:
	case TEGRA114:
	case TEGRA124:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
	tegra_tear_down_cpu = tegra30_tear_down_cpu;
	break;
	}
	}

	/*
	* restore_cpu_complex
	*
	* restores cpu clock setting, clears flow controller
	*
	* Always called on CPU 0.
	*/
	static void restore_cpu_complex(void)
	{
	int cpu = smp_processor_id();

	BUG_ON(cpu != 0);

	#ifdef CONFIG_SMP
	cpu = cpu_logical_map(cpu);
	#endif

	/* Restore the CPU clock settings */
	tegra_cpu_clock_resume();

	flowctrl_cpu_suspend_exit(cpu);
	}

	/*
	* suspend_cpu_complex
	*
	* saves pll state for use by restart_plls, prepares flow controller for
	* transition to suspend state
	*
	* Must always be called on cpu 0.
	*/
	static void suspend_cpu_complex(void)
	{
	int cpu = smp_processor_id();

	BUG_ON(cpu != 0);

	#ifdef CONFIG_SMP
	cpu = cpu_logical_map(cpu);
	#endif

	/* Save the CPU clock settings */
	tegra_cpu_clock_suspend();

	flowctrl_cpu_suspend_enter(cpu);
	}

	void tegra_clear_cpu_in_lp2(void)
	{
	int phy_cpu_id = cpu_logical_map(smp_processor_id());
	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;

	spin_lock(&tegra_lp2_lock);

	BUG_ON(!(*cpu_in_lp2 & BIT(phy_cpu_id)));
	*cpu_in_lp2 &= ~BIT(phy_cpu_id);

	spin_unlock(&tegra_lp2_lock);
	}

	bool tegra_set_cpu_in_lp2(void)
	{
	int phy_cpu_id = cpu_logical_map(smp_processor_id());
	bool last_cpu = false;
	cpumask_t *cpu_lp2_mask = tegra_cpu_lp2_mask;
	u32 *cpu_in_lp2 = tegra_cpu_lp2_mask;

	spin_lock(&tegra_lp2_lock);

	BUG_ON((*cpu_in_lp2 & BIT(phy_cpu_id)));
	*cpu_in_lp2 \|= BIT(phy_cpu_id);

	if ((phy_cpu_id == 0) && cpumask_equal(cpu_lp2_mask, cpu_online_mask))
	last_cpu = true;
	else if (tegra_get_chip_id() == TEGRA20 && phy_cpu_id == 1)
	tegra20_cpu_set_resettable_soon();

	spin_unlock(&tegra_lp2_lock);
	return last_cpu;
	}

	int tegra_cpu_do_idle(void)
	{
	return cpu_do_idle();
	}

	static int tegra_sleep_cpu(unsigned long v2p)
	{
	setup_mm_for_reboot();
	tegra_sleep_cpu_finish(v2p);

	/* should never here */
	BUG();

	return 0;
	}

	static void tegra_pm_set(enum tegra_suspend_mode mode)
	{
	u32 value;

	switch (tegra_get_chip_id()) {
	case TEGRA20:
	case TEGRA30:
	break;
	default:
	/* Turn off CRAIL */
	value = flowctrl_read_cpu_csr(0);
	value &= ~FLOW_CTRL_CSR_ENABLE_EXT_MASK;
	value \|= FLOW_CTRL_CSR_ENABLE_EXT_CRAIL;
	flowctrl_write_cpu_csr(0, value);
	break;
	}

	tegra_pmc_enter_suspend_mode(mode);
	}

	void tegra_idle_lp2_last(void)
	{
	tegra_pm_set(TEGRA_SUSPEND_LP2);

	cpu_cluster_pm_enter();
	suspend_cpu_complex();

	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, &tegra_sleep_cpu);

	restore_cpu_complex();
	cpu_cluster_pm_exit();
	}

	enum tegra_suspend_mode tegra_pm_validate_suspend_mode(
	enum tegra_suspend_mode mode)
	{
	/*
	* The Tegra devices support suspending to LP1 or lower currently.
	*/
	if (mode > TEGRA_SUSPEND_LP1)
	return TEGRA_SUSPEND_LP1;

	return mode;
	}

	static int tegra_sleep_core(unsigned long v2p)
	{
	setup_mm_for_reboot();
	tegra_sleep_core_finish(v2p);

	/* should never here */
	BUG();

	return 0;
	}

	/*
	* tegra_lp1_iram_hook
	*
	* Hooking the address of LP1 reset vector and SDRAM self-refresh code in
	* SDRAM. These codes not be copied to IRAM in this fuction. We need to
	* copy these code to IRAM before LP0/LP1 suspend and restore the content
	* of IRAM after resume.
	*/
	static bool tegra_lp1_iram_hook(void)
	{
	switch (tegra_get_chip_id()) {
	case TEGRA20:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
	tegra20_lp1_iram_hook();
	break;
	case TEGRA30:
	case TEGRA114:
	case TEGRA124:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
	tegra30_lp1_iram_hook();
	break;
	default:
	break;
	}

	if (!tegra_lp1_iram.start_addr \|\| !tegra_lp1_iram.end_addr)
	return false;

	iram_save_size = tegra_lp1_iram.end_addr - tegra_lp1_iram.start_addr;
	iram_save_addr = kmalloc(iram_save_size, GFP_KERNEL);
	if (!iram_save_addr)
	return false;

	return true;
	}

	static bool tegra_sleep_core_init(void)
	{
	switch (tegra_get_chip_id()) {
	case TEGRA20:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
	tegra20_sleep_core_init();
	break;
	case TEGRA30:
	case TEGRA114:
	case TEGRA124:
	if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) \|\|
	IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
	tegra30_sleep_core_init();
	break;
	default:
	break;
	}

	if (!tegra_sleep_core_finish)
	return false;

	return true;
	}

	static void tegra_suspend_enter_lp1(void)
	{
	/* copy the reset vector & SDRAM shutdown code into IRAM */
	memcpy(iram_save_addr, IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
	iram_save_size);
	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA),
	tegra_lp1_iram.start_addr, iram_save_size);

	((u32 )tegra_cpu_lp1_mask) = 1;
	}

	static void tegra_suspend_exit_lp1(void)
	{
	/* restore IRAM */
	memcpy(IO_ADDRESS(TEGRA_IRAM_LPx_RESUME_AREA), iram_save_addr,
	iram_save_size);

	(u32 )tegra_cpu_lp1_mask = 0;
	}

	static const char *lp_state[TEGRA_MAX_SUSPEND_MODE] = {
	[TEGRA_SUSPEND_NONE] = "none",
	[TEGRA_SUSPEND_LP2] = "LP2",
	[TEGRA_SUSPEND_LP1] = "LP1",
	[TEGRA_SUSPEND_LP0] = "LP0",
	};

	static int tegra_suspend_enter(suspend_state_t state)
	{
	enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();

	if (WARN_ON(mode < TEGRA_SUSPEND_NONE \|\|
	mode >= TEGRA_MAX_SUSPEND_MODE))
	return -EINVAL;

	pr_info("Entering suspend state %s\n", lp_state[mode]);

	tegra_pm_set(mode);

	local_fiq_disable();

	suspend_cpu_complex();
	switch (mode) {
	case TEGRA_SUSPEND_LP1:
	tegra_suspend_enter_lp1();
	break;
	case TEGRA_SUSPEND_LP2:
	tegra_set_cpu_in_lp2();
	break;
	default:
	break;
	}

	cpu_suspend(PHYS_OFFSET - PAGE_OFFSET, tegra_sleep_func);

	switch (mode) {
	case TEGRA_SUSPEND_LP1:
	tegra_suspend_exit_lp1();
	break;
	case TEGRA_SUSPEND_LP2:
	tegra_clear_cpu_in_lp2();
	break;
	default:
	break;
	}
	restore_cpu_complex();

	local_fiq_enable();

	return 0;
	}

	static const struct platform_suspend_ops tegra_suspend_ops = {
	.valid = suspend_valid_only_mem,
	.enter = tegra_suspend_enter,
	};

	void __init tegra_init_suspend(void)
	{
	enum tegra_suspend_mode mode = tegra_pmc_get_suspend_mode();

	if (mode == TEGRA_SUSPEND_NONE)
	return;

	tegra_tear_down_cpu_init();

	if (mode >= TEGRA_SUSPEND_LP1) {
	if (!tegra_lp1_iram_hook() \|\| !tegra_sleep_core_init()) {
	pr_err("%s: unable to allocate memory for SDRAM"
	"self-refresh -- LP0/LP1 unavailable\n",
	__func__);
	tegra_pmc_set_suspend_mode(TEGRA_SUSPEND_LP2);
	mode = TEGRA_SUSPEND_LP2;
	}
	}

	/* set up sleep function for cpu_suspend */
	switch (mode) {
	case TEGRA_SUSPEND_LP1:
	tegra_sleep_func = tegra_sleep_core;
	break;
	case TEGRA_SUSPEND_LP2:
	tegra_sleep_func = tegra_sleep_cpu;
	break;
	default:
	break;
	}

	suspend_set_ops(&tegra_suspend_ops);
	}
	#endif