plat/mediatek/mt8173/plat_pm.c - filogic/atf - Gitiles

 /*
  * Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * Redistributions of source code must retain the above copyright notice, this
  * list of conditions and the following disclaimer.
  *
  * Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  *
  * Neither the name of ARM nor the names of its contributors may be used
  * to endorse or promote products derived from this software without specific
  * prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  */

 #include <arch_helpers.h>
 #include <arm_gic.h>
 #include <assert.h>
 #include <bakery_lock.h>
 #include <cci.h>
 #include <console.h>
 #include <debug.h>
 #include <errno.h>
 #include <mcucfg.h>
 #include <mmio.h>
 #include <mt8173_def.h>
 #include <mt_cpuxgpt.h> /* generic_timer_backup() */
 #include <plat_private.h>
 #include <power_tracer.h>
 #include <psci.h>
 #include <rtc.h>
 #include <scu.h>
 #include <spm_hotplug.h>
 #include <spm_mcdi.h>
 #include <spm_suspend.h>

 struct core_context {
 	unsigned long timer_data[8];
 	unsigned int count;
 	unsigned int rst;
 	unsigned int abt;
 	unsigned int brk;
 };

 struct cluster_context {
 	struct core_context core[PLATFORM_MAX_CPUS_PER_CLUSTER];
 };

 /*
  * Top level structure to hold the complete context of a multi cluster system
  */
 struct system_context {
 	struct cluster_context cluster[PLATFORM_CLUSTER_COUNT];
 };

 /*
  * Top level structure which encapsulates the context of the entire system
  */
 static struct system_context dormant_data[1];

 static inline struct cluster_context *system_cluster(
 						struct system_context *system,
 						uint32_t clusterid)
 {
 	return &system->cluster[clusterid];
 }

 static inline struct core_context *cluster_core(struct cluster_context *cluster,
 						uint32_t cpuid)
 {
 	return &cluster->core[cpuid];
 }

 static struct cluster_context *get_cluster_data(unsigned long mpidr)
 {
 	uint32_t clusterid;

 	clusterid = (mpidr & MPIDR_CLUSTER_MASK) >> MPIDR_AFFINITY_BITS;

 	return system_cluster(dormant_data, clusterid);
 }

 static struct core_context *get_core_data(unsigned long mpidr)
 {
 	struct cluster_context *cluster;
 	uint32_t cpuid;

 	cluster = get_cluster_data(mpidr);
 	cpuid = mpidr & MPIDR_CPU_MASK;

 	return cluster_core(cluster, cpuid);
 }

 static void mt_save_generic_timer(unsigned long *container)
 {
 	uint64_t ctl;
 	uint64_t val;

 	__asm__ volatile("mrs	%x0, cntkctl_el1\n\t"
 			 "mrs	%x1, cntp_cval_el0\n\t"
 			 "stp	%x0, %x1, [%2, #0]"
 			 : "=&r" (ctl), "=&r" (val)
 			 : "r" (container)
 			 : "memory");

 	__asm__ volatile("mrs	%x0, cntp_tval_el0\n\t"
 			 "mrs	%x1, cntp_ctl_el0\n\t"
 			 "stp	%x0, %x1, [%2, #16]"
 			 : "=&r" (val), "=&r" (ctl)
 			 : "r" (container)
 			 : "memory");

 	__asm__ volatile("mrs	%x0, cntv_tval_el0\n\t"
 			 "mrs	%x1, cntv_ctl_el0\n\t"
 			 "stp	%x0, %x1, [%2, #32]"
 			 : "=&r" (val), "=&r" (ctl)
 			 : "r" (container)
 			 : "memory");
 }

 static void mt_restore_generic_timer(unsigned long *container)
 {
 	uint64_t ctl;
 	uint64_t val;

 	__asm__ volatile("ldp	%x0, %x1, [%2, #0]\n\t"
 			 "msr	cntkctl_el1, %x0\n\t"
 			 "msr	cntp_cval_el0, %x1"
 			 : "=&r" (ctl), "=&r" (val)
 			 : "r" (container)
 			 : "memory");

 	__asm__ volatile("ldp	%x0, %x1, [%2, #16]\n\t"
 			 "msr	cntp_tval_el0, %x0\n\t"
 			 "msr	cntp_ctl_el0, %x1"
 			 : "=&r" (val), "=&r" (ctl)
 			 : "r" (container)
 			 : "memory");

 	__asm__ volatile("ldp	%x0, %x1, [%2, #32]\n\t"
 			 "msr	cntv_tval_el0, %x0\n\t"
 			 "msr	cntv_ctl_el0, %x1"
 			 : "=&r" (val), "=&r" (ctl)
 			 : "r" (container)
 			 : "memory");
 }

 static inline uint64_t read_cntpctl(void)
 {
 	uint64_t cntpctl;

 	__asm__ volatile("mrs	%x0, cntp_ctl_el0"
 			 : "=r" (cntpctl) : : "memory");

 	return cntpctl;
 }

 static inline void write_cntpctl(uint64_t cntpctl)
 {
 	__asm__ volatile("msr	cntp_ctl_el0, %x0" : : "r"(cntpctl));
 }

 static void stop_generic_timer(void)
 {
 	/*
 	 * Disable the timer and mask the irq to prevent
 	 * suprious interrupts on this cpu interface. It
 	 * will bite us when we come back if we don't. It
 	 * will be replayed on the inbound cluster.
 	 */
 	uint64_t cntpctl = read_cntpctl();

 	write_cntpctl(clr_cntp_ctl_enable(cntpctl));
 }

 static void mt_cpu_save(unsigned long mpidr)
 {
 	struct core_context *core;

 	core = get_core_data(mpidr);
 	mt_save_generic_timer(core->timer_data);

 	/* disable timer irq, and upper layer should enable it again. */
 	stop_generic_timer();
 }

 static void mt_cpu_restore(unsigned long mpidr)
 {
 	struct core_context *core;

 	core = get_core_data(mpidr);
 	mt_restore_generic_timer(core->timer_data);
 }

 static void mt_platform_save_context(unsigned long mpidr)
 {
 	/* mcusys_save_context: */
 	mt_cpu_save(mpidr);
 }

 static void mt_platform_restore_context(unsigned long mpidr)
 {
 	/* mcusys_restore_context: */
 	mt_cpu_restore(mpidr);
 }

 /*******************************************************************************
 * Private function which is used to determine if any platform actions
 * should be performed for the specified affinity instance given its
 * state. Nothing needs to be done if the 'state' is not off or if this is not
 * the highest affinity level which will enter the 'state'.
 *******************************************************************************/
 static int32_t plat_do_plat_actions(unsigned int afflvl, unsigned int state)
 {
 	unsigned int max_phys_off_afflvl;

 	assert(afflvl <= MPIDR_AFFLVL2);

 	if (state != PSCI_STATE_OFF)
 		return -EAGAIN;

 	/*
 	 * Find the highest affinity level which will be suspended and postpone
 	 * all the platform specific actions until that level is hit.
 	 */
 	max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
 	assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
 	if (afflvl != max_phys_off_afflvl)
 		return -EAGAIN;

 	return 0;
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to enter
  * standby.
  ******************************************************************************/
 static void plat_affinst_standby(unsigned int power_state)
 {
 	unsigned int target_afflvl;

 	/* Sanity check the requested state */
 	target_afflvl = psci_get_pstate_afflvl(power_state);

 	/*
 	 * It's possible to enter standby only on affinity level 0 i.e. a cpu
 	 * on the MTK_platform. Ignore any other affinity level.
 	 */
 	if (target_afflvl == MPIDR_AFFLVL0) {
 		/*
 		 * Enter standby state. dsb is good practice before using wfi
 		 * to enter low power states.
 		 */
 		dsb();
 		wfi();
 	}
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to be turned
  * on. The level and mpidr determine the affinity instance.
  ******************************************************************************/
 static int plat_affinst_on(unsigned long mpidr,
 		    unsigned long sec_entrypoint,
 		    unsigned int afflvl,
 		    unsigned int state)
 {
 	int rc = PSCI_E_SUCCESS;
 	unsigned long cpu_id;
 	unsigned long cluster_id;
 	uintptr_t rv;

 	/*
 	 * It's possible to turn on only affinity level 0 i.e. a cpu
 	 * on the MTK_platform. Ignore any other affinity level.
 	 */
 	if (afflvl != MPIDR_AFFLVL0)
 		return rc;

 	cpu_id = mpidr & MPIDR_CPU_MASK;
 	cluster_id = mpidr & MPIDR_CLUSTER_MASK;

 	if (cluster_id)
 		rv = (uintptr_t)&mt8173_mcucfg->mp1_rv_addr[cpu_id].rv_addr_lw;
 	else
 		rv = (uintptr_t)&mt8173_mcucfg->mp0_rv_addr[cpu_id].rv_addr_lw;

 	mmio_write_32(rv, sec_entrypoint);
 	INFO("mt_on[%ld:%ld], entry %x\n",
 		cluster_id, cpu_id, mmio_read_32(rv));

 	spm_hotplug_on(mpidr);

 	return rc;
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to be turned
  * off. The level and mpidr determine the affinity instance. The 'state' arg.
  * allows the platform to decide whether the cluster is being turned off and
  * take apt actions.
  *
  * CAUTION: This function is called with coherent stacks so that caches can be
  * turned off, flushed and coherency disabled. There is no guarantee that caches
  * will remain turned on across calls to this function as each affinity level is
  * dealt with. So do not write & read global variables across calls. It will be
  * wise to do flush a write to the global to prevent unpredictable results.
  ******************************************************************************/
 static void plat_affinst_off(unsigned int afflvl, unsigned int state)
 {
 	unsigned long mpidr = read_mpidr_el1();

 	/* Determine if any platform actions need to be executed. */
 	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
 		return;

 	/* Prevent interrupts from spuriously waking up this cpu */
 	arm_gic_cpuif_deactivate();

 	spm_hotplug_off(mpidr);

 	trace_power_flow(mpidr, CPU_DOWN);

 	if (afflvl != MPIDR_AFFLVL0) {
 		/* Disable coherency if this cluster is to be turned off */
 		plat_cci_disable();

 		trace_power_flow(mpidr, CLUSTER_DOWN);
 	}
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to be
  * suspended. The level and mpidr determine the affinity instance. The 'state'
  * arg. allows the platform to decide whether the cluster is being turned off
  * and take apt actions.
  *
  * CAUTION: This function is called with coherent stacks so that caches can be
  * turned off, flushed and coherency disabled. There is no guarantee that caches
  * will remain turned on across calls to this function as each affinity level is
  * dealt with. So do not write & read global variables across calls. It will be
  * wise to do flush a write to the global to prevent unpredictable results.
  ******************************************************************************/
 static void plat_affinst_suspend(unsigned long sec_entrypoint,
 			  unsigned int afflvl,
 			  unsigned int state)
 {
 	unsigned long mpidr = read_mpidr_el1();
 	unsigned long cluster_id;
 	unsigned long cpu_id;
 	uintptr_t rv;

 	/* Determine if any platform actions need to be executed. */
 	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
 		return;

 	cpu_id = mpidr & MPIDR_CPU_MASK;
 	cluster_id = mpidr & MPIDR_CLUSTER_MASK;

 	if (cluster_id)
 		rv = (uintptr_t)&mt8173_mcucfg->mp1_rv_addr[cpu_id].rv_addr_lw;
 	else
 		rv = (uintptr_t)&mt8173_mcucfg->mp0_rv_addr[cpu_id].rv_addr_lw;

 	mmio_write_32(rv, sec_entrypoint);

 	if (afflvl < MPIDR_AFFLVL2)
 		spm_mcdi_prepare_for_off_state(mpidr, afflvl);

 	if (afflvl >= MPIDR_AFFLVL0)
 		mt_platform_save_context(mpidr);

 	/* Perform the common cluster specific operations */
 	if (afflvl >= MPIDR_AFFLVL1) {
 		/* Disable coherency if this cluster is to be turned off */
 		plat_cci_disable();
 	}

 	if (afflvl >= MPIDR_AFFLVL2) {
 		disable_scu(mpidr);
 		generic_timer_backup();
 		spm_system_suspend();
 		/* Prevent interrupts from spuriously waking up this cpu */
 		arm_gic_cpuif_deactivate();
 	}
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance has just been powered
  * on after being turned off earlier. The level and mpidr determine the affinity
  * instance. The 'state' arg. allows the platform to decide whether the cluster
  * was turned off prior to wakeup and do what's necessary to setup it up
  * correctly.
  ******************************************************************************/
 static void plat_affinst_on_finish(unsigned int afflvl, unsigned int state)
 {
 	unsigned long mpidr = read_mpidr_el1();

 	/* Determine if any platform actions need to be executed. */
 	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
 		return;

 	/* Perform the common cluster specific operations */
 	if (afflvl >= MPIDR_AFFLVL1) {
 		/* Enable coherency if this cluster was off */
 		plat_cci_enable();
 		trace_power_flow(mpidr, CLUSTER_UP);
 	}

 	/* Enable the gic cpu interface */
 	arm_gic_cpuif_setup();
 	arm_gic_pcpu_distif_setup();
 	trace_power_flow(mpidr, CPU_UP);
 }

 /*******************************************************************************
  * MTK_platform handler called when an affinity instance has just been powered
  * on after having been suspended earlier. The level and mpidr determine the
  * affinity instance.
  ******************************************************************************/
 static void plat_affinst_suspend_finish(unsigned int afflvl, unsigned int state)
 {
 	unsigned long mpidr = read_mpidr_el1();

 	/* Determine if any platform actions need to be executed. */
 	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
 		return;

 	if (afflvl >= MPIDR_AFFLVL2) {
 		/* Enable the gic cpu interface */
 		arm_gic_setup();
 		arm_gic_cpuif_setup();
 		spm_system_suspend_finish();
 		enable_scu(mpidr);
 	}

 	/* Perform the common cluster specific operations */
 	if (afflvl >= MPIDR_AFFLVL1) {
 		/* Enable coherency if this cluster was off */
 		plat_cci_enable();
 	}

 	if (afflvl >= MPIDR_AFFLVL0)
 		mt_platform_restore_context(mpidr);

 	if (afflvl < MPIDR_AFFLVL2)
 		spm_mcdi_finish_for_on_state(mpidr, afflvl);

 	arm_gic_pcpu_distif_setup();
 }

 static unsigned int plat_get_sys_suspend_power_state(void)
 {
 	/* StateID: 0, StateType: 1(power down), PowerLevel: 2(system) */
 	return psci_make_powerstate(0, 1, 2);
 }

 /*******************************************************************************
  * MTK handlers to shutdown/reboot the system
  ******************************************************************************/
 static void __dead2 plat_system_off(void)
 {
 	INFO("MTK System Off\n");

 	rtc_bbpu_power_down();

 	wfi();
 	ERROR("MTK System Off: operation not handled.\n");
 	panic();
 }

 static void __dead2 plat_system_reset(void)
 {
 	/* Write the System Configuration Control Register */
 	INFO("MTK System Reset\n");

 	mmio_clrsetbits_32(MTK_WDT_BASE,
 		(MTK_WDT_MODE_DUAL_MODE | MTK_WDT_MODE_IRQ),
 		MTK_WDT_MODE_KEY);
 	mmio_setbits_32(MTK_WDT_BASE, (MTK_WDT_MODE_KEY | MTK_WDT_MODE_EXTEN));
 	mmio_setbits_32(MTK_WDT_SWRST, MTK_WDT_SWRST_KEY);

 	wfi();
 	ERROR("MTK System Reset: operation not handled.\n");
 	panic();
 }

 /*******************************************************************************
  * Export the platform handlers to enable psci to invoke them
  ******************************************************************************/
 static const plat_pm_ops_t plat_plat_pm_ops = {
 	.affinst_standby		= plat_affinst_standby,
 	.affinst_on			= plat_affinst_on,
 	.affinst_off			= plat_affinst_off,
 	.affinst_suspend		= plat_affinst_suspend,
 	.affinst_on_finish		= plat_affinst_on_finish,
 	.affinst_suspend_finish		= plat_affinst_suspend_finish,
 	.system_off			= plat_system_off,
 	.system_reset			= plat_system_reset,
 	.get_sys_suspend_power_state	= plat_get_sys_suspend_power_state,
 };

 /*******************************************************************************
  * Export the platform specific power ops & initialize the mtk_platform power
  * controller
  ******************************************************************************/
 int platform_setup_pm(const plat_pm_ops_t **plat_ops)
 {
 	*plat_ops = &plat_plat_pm_ops;
 	return 0;
 }
	/*
	* Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* Redistributions of source code must retain the above copyright notice, this
	* list of conditions and the following disclaimer.
	*
	* Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* Neither the name of ARM nor the names of its contributors may be used
	* to endorse or promote products derived from this software without specific
	* prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	* POSSIBILITY OF SUCH DAMAGE.
	*/

	#include <arch_helpers.h>
	#include <arm_gic.h>
	#include <assert.h>
	#include <bakery_lock.h>
	#include <cci.h>
	#include <console.h>
	#include <debug.h>
	#include <errno.h>
	#include <mcucfg.h>
	#include <mmio.h>
	#include <mt8173_def.h>
	#include <mt_cpuxgpt.h> /* generic_timer_backup() */
	#include <plat_private.h>
	#include <power_tracer.h>
	#include <psci.h>
	#include <rtc.h>
	#include <scu.h>
	#include <spm_hotplug.h>
	#include <spm_mcdi.h>
	#include <spm_suspend.h>

	struct core_context {
	unsigned long timer_data[8];
	unsigned int count;
	unsigned int rst;
	unsigned int abt;
	unsigned int brk;
	};

	struct cluster_context {
	struct core_context core[PLATFORM_MAX_CPUS_PER_CLUSTER];
	};

	/*
	* Top level structure to hold the complete context of a multi cluster system
	*/
	struct system_context {
	struct cluster_context cluster[PLATFORM_CLUSTER_COUNT];
	};

	/*
	* Top level structure which encapsulates the context of the entire system
	*/
	static struct system_context dormant_data[1];

	static inline struct cluster_context *system_cluster(
	struct system_context *system,
	uint32_t clusterid)
	{
	return &system->cluster[clusterid];
	}

	static inline struct core_context cluster_core(struct cluster_context cluster,
	uint32_t cpuid)
	{
	return &cluster->core[cpuid];
	}

	static struct cluster_context *get_cluster_data(unsigned long mpidr)
	{
	uint32_t clusterid;

	clusterid = (mpidr & MPIDR_CLUSTER_MASK) >> MPIDR_AFFINITY_BITS;

	return system_cluster(dormant_data, clusterid);
	}

	static struct core_context *get_core_data(unsigned long mpidr)
	{
	struct cluster_context *cluster;
	uint32_t cpuid;

	cluster = get_cluster_data(mpidr);
	cpuid = mpidr & MPIDR_CPU_MASK;

	return cluster_core(cluster, cpuid);
	}

	static void mt_save_generic_timer(unsigned long *container)
	{
	uint64_t ctl;
	uint64_t val;

	__asm__ volatile("mrs %x0, cntkctl_el1\n\t"
	"mrs %x1, cntp_cval_el0\n\t"
	"stp %x0, %x1, [%2, #0]"
	: "=&r" (ctl), "=&r" (val)
	: "r" (container)
	: "memory");

	__asm__ volatile("mrs %x0, cntp_tval_el0\n\t"
	"mrs %x1, cntp_ctl_el0\n\t"
	"stp %x0, %x1, [%2, #16]"
	: "=&r" (val), "=&r" (ctl)
	: "r" (container)
	: "memory");

	__asm__ volatile("mrs %x0, cntv_tval_el0\n\t"
	"mrs %x1, cntv_ctl_el0\n\t"
	"stp %x0, %x1, [%2, #32]"
	: "=&r" (val), "=&r" (ctl)
	: "r" (container)
	: "memory");
	}

	static void mt_restore_generic_timer(unsigned long *container)
	{
	uint64_t ctl;
	uint64_t val;

	__asm__ volatile("ldp %x0, %x1, [%2, #0]\n\t"
	"msr cntkctl_el1, %x0\n\t"
	"msr cntp_cval_el0, %x1"
	: "=&r" (ctl), "=&r" (val)
	: "r" (container)
	: "memory");

	__asm__ volatile("ldp %x0, %x1, [%2, #16]\n\t"
	"msr cntp_tval_el0, %x0\n\t"
	"msr cntp_ctl_el0, %x1"
	: "=&r" (val), "=&r" (ctl)
	: "r" (container)
	: "memory");

	__asm__ volatile("ldp %x0, %x1, [%2, #32]\n\t"
	"msr cntv_tval_el0, %x0\n\t"
	"msr cntv_ctl_el0, %x1"
	: "=&r" (val), "=&r" (ctl)
	: "r" (container)
	: "memory");
	}

	static inline uint64_t read_cntpctl(void)
	{
	uint64_t cntpctl;

	__asm__ volatile("mrs %x0, cntp_ctl_el0"
	: "=r" (cntpctl) : : "memory");

	return cntpctl;
	}

	static inline void write_cntpctl(uint64_t cntpctl)
	{
	__asm__ volatile("msr cntp_ctl_el0, %x0" : : "r"(cntpctl));
	}

	static void stop_generic_timer(void)
	{
	/*
	* Disable the timer and mask the irq to prevent
	* suprious interrupts on this cpu interface. It
	* will bite us when we come back if we don't. It
	* will be replayed on the inbound cluster.
	*/
	uint64_t cntpctl = read_cntpctl();

	write_cntpctl(clr_cntp_ctl_enable(cntpctl));
	}

	static void mt_cpu_save(unsigned long mpidr)
	{
	struct core_context *core;

	core = get_core_data(mpidr);
	mt_save_generic_timer(core->timer_data);

	/* disable timer irq, and upper layer should enable it again. */
	stop_generic_timer();
	}

	static void mt_cpu_restore(unsigned long mpidr)
	{
	struct core_context *core;

	core = get_core_data(mpidr);
	mt_restore_generic_timer(core->timer_data);
	}

	static void mt_platform_save_context(unsigned long mpidr)
	{
	/* mcusys_save_context: */
	mt_cpu_save(mpidr);
	}

	static void mt_platform_restore_context(unsigned long mpidr)
	{
	/* mcusys_restore_context: */
	mt_cpu_restore(mpidr);
	}

	/*******************************************************************************
	* Private function which is used to determine if any platform actions
	* should be performed for the specified affinity instance given its
	* state. Nothing needs to be done if the 'state' is not off or if this is not
	* the highest affinity level which will enter the 'state'.
	*******************************************************************************/
	static int32_t plat_do_plat_actions(unsigned int afflvl, unsigned int state)
	{
	unsigned int max_phys_off_afflvl;

	assert(afflvl <= MPIDR_AFFLVL2);

	if (state != PSCI_STATE_OFF)
	return -EAGAIN;

	/*
	* Find the highest affinity level which will be suspended and postpone
	* all the platform specific actions until that level is hit.
	*/
	max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
	assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
	if (afflvl != max_phys_off_afflvl)
	return -EAGAIN;

	return 0;
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance is about to enter
	* standby.
	******************************************************************************/
	static void plat_affinst_standby(unsigned int power_state)
	{
	unsigned int target_afflvl;

	/* Sanity check the requested state */
	target_afflvl = psci_get_pstate_afflvl(power_state);

	/*
	* It's possible to enter standby only on affinity level 0 i.e. a cpu
	* on the MTK_platform. Ignore any other affinity level.
	*/
	if (target_afflvl == MPIDR_AFFLVL0) {
	/*
	* Enter standby state. dsb is good practice before using wfi
	* to enter low power states.
	*/
	dsb();
	wfi();
	}
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance is about to be turned
	* on. The level and mpidr determine the affinity instance.
	******************************************************************************/
	static int plat_affinst_on(unsigned long mpidr,
	unsigned long sec_entrypoint,
	unsigned int afflvl,
	unsigned int state)
	{
	int rc = PSCI_E_SUCCESS;
	unsigned long cpu_id;
	unsigned long cluster_id;
	uintptr_t rv;

	/*
	* It's possible to turn on only affinity level 0 i.e. a cpu
	* on the MTK_platform. Ignore any other affinity level.
	*/
	if (afflvl != MPIDR_AFFLVL0)
	return rc;

	cpu_id = mpidr & MPIDR_CPU_MASK;
	cluster_id = mpidr & MPIDR_CLUSTER_MASK;

	if (cluster_id)
	rv = (uintptr_t)&mt8173_mcucfg->mp1_rv_addr[cpu_id].rv_addr_lw;
	else
	rv = (uintptr_t)&mt8173_mcucfg->mp0_rv_addr[cpu_id].rv_addr_lw;

	mmio_write_32(rv, sec_entrypoint);
	INFO("mt_on[%ld:%ld], entry %x\n",
	cluster_id, cpu_id, mmio_read_32(rv));

	spm_hotplug_on(mpidr);

	return rc;
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance is about to be turned
	* off. The level and mpidr determine the affinity instance. The 'state' arg.
	* allows the platform to decide whether the cluster is being turned off and
	* take apt actions.
	*
	* CAUTION: This function is called with coherent stacks so that caches can be
	* turned off, flushed and coherency disabled. There is no guarantee that caches
	* will remain turned on across calls to this function as each affinity level is
	* dealt with. So do not write & read global variables across calls. It will be
	* wise to do flush a write to the global to prevent unpredictable results.
	******************************************************************************/
	static void plat_affinst_off(unsigned int afflvl, unsigned int state)
	{
	unsigned long mpidr = read_mpidr_el1();

	/* Determine if any platform actions need to be executed. */
	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
	return;

	/* Prevent interrupts from spuriously waking up this cpu */
	arm_gic_cpuif_deactivate();

	spm_hotplug_off(mpidr);

	trace_power_flow(mpidr, CPU_DOWN);

	if (afflvl != MPIDR_AFFLVL0) {
	/* Disable coherency if this cluster is to be turned off */
	plat_cci_disable();

	trace_power_flow(mpidr, CLUSTER_DOWN);
	}
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance is about to be
	* suspended. The level and mpidr determine the affinity instance. The 'state'
	* arg. allows the platform to decide whether the cluster is being turned off
	* and take apt actions.
	*
	* CAUTION: This function is called with coherent stacks so that caches can be
	* turned off, flushed and coherency disabled. There is no guarantee that caches
	* will remain turned on across calls to this function as each affinity level is
	* dealt with. So do not write & read global variables across calls. It will be
	* wise to do flush a write to the global to prevent unpredictable results.
	******************************************************************************/
	static void plat_affinst_suspend(unsigned long sec_entrypoint,
	unsigned int afflvl,
	unsigned int state)
	{
	unsigned long mpidr = read_mpidr_el1();
	unsigned long cluster_id;
	unsigned long cpu_id;
	uintptr_t rv;

	/* Determine if any platform actions need to be executed. */
	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
	return;

	cpu_id = mpidr & MPIDR_CPU_MASK;
	cluster_id = mpidr & MPIDR_CLUSTER_MASK;

	if (cluster_id)
	rv = (uintptr_t)&mt8173_mcucfg->mp1_rv_addr[cpu_id].rv_addr_lw;
	else
	rv = (uintptr_t)&mt8173_mcucfg->mp0_rv_addr[cpu_id].rv_addr_lw;

	mmio_write_32(rv, sec_entrypoint);

	if (afflvl < MPIDR_AFFLVL2)
	spm_mcdi_prepare_for_off_state(mpidr, afflvl);

	if (afflvl >= MPIDR_AFFLVL0)
	mt_platform_save_context(mpidr);

	/* Perform the common cluster specific operations */
	if (afflvl >= MPIDR_AFFLVL1) {
	/* Disable coherency if this cluster is to be turned off */
	plat_cci_disable();
	}

	if (afflvl >= MPIDR_AFFLVL2) {
	disable_scu(mpidr);
	generic_timer_backup();
	spm_system_suspend();
	/* Prevent interrupts from spuriously waking up this cpu */
	arm_gic_cpuif_deactivate();
	}
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance has just been powered
	* on after being turned off earlier. The level and mpidr determine the affinity
	* instance. The 'state' arg. allows the platform to decide whether the cluster
	* was turned off prior to wakeup and do what's necessary to setup it up
	* correctly.
	******************************************************************************/
	static void plat_affinst_on_finish(unsigned int afflvl, unsigned int state)
	{
	unsigned long mpidr = read_mpidr_el1();

	/* Determine if any platform actions need to be executed. */
	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
	return;

	/* Perform the common cluster specific operations */
	if (afflvl >= MPIDR_AFFLVL1) {
	/* Enable coherency if this cluster was off */
	plat_cci_enable();
	trace_power_flow(mpidr, CLUSTER_UP);
	}

	/* Enable the gic cpu interface */
	arm_gic_cpuif_setup();
	arm_gic_pcpu_distif_setup();
	trace_power_flow(mpidr, CPU_UP);
	}

	/*******************************************************************************
	* MTK_platform handler called when an affinity instance has just been powered
	* on after having been suspended earlier. The level and mpidr determine the
	* affinity instance.
	******************************************************************************/
	static void plat_affinst_suspend_finish(unsigned int afflvl, unsigned int state)
	{
	unsigned long mpidr = read_mpidr_el1();

	/* Determine if any platform actions need to be executed. */
	if (plat_do_plat_actions(afflvl, state) == -EAGAIN)
	return;

	if (afflvl >= MPIDR_AFFLVL2) {
	/* Enable the gic cpu interface */
	arm_gic_setup();
	arm_gic_cpuif_setup();
	spm_system_suspend_finish();
	enable_scu(mpidr);
	}

	/* Perform the common cluster specific operations */
	if (afflvl >= MPIDR_AFFLVL1) {
	/* Enable coherency if this cluster was off */
	plat_cci_enable();
	}

	if (afflvl >= MPIDR_AFFLVL0)
	mt_platform_restore_context(mpidr);

	if (afflvl < MPIDR_AFFLVL2)
	spm_mcdi_finish_for_on_state(mpidr, afflvl);

	arm_gic_pcpu_distif_setup();
	}

	static unsigned int plat_get_sys_suspend_power_state(void)
	{
	/* StateID: 0, StateType: 1(power down), PowerLevel: 2(system) */
	return psci_make_powerstate(0, 1, 2);
	}

	/*******************************************************************************
	* MTK handlers to shutdown/reboot the system
	******************************************************************************/
	static void __dead2 plat_system_off(void)
	{
	INFO("MTK System Off\n");

	rtc_bbpu_power_down();

	wfi();
	ERROR("MTK System Off: operation not handled.\n");
	panic();
	}

	static void __dead2 plat_system_reset(void)
	{
	/* Write the System Configuration Control Register */
	INFO("MTK System Reset\n");

	mmio_clrsetbits_32(MTK_WDT_BASE,
	(MTK_WDT_MODE_DUAL_MODE \| MTK_WDT_MODE_IRQ),
	MTK_WDT_MODE_KEY);
	mmio_setbits_32(MTK_WDT_BASE, (MTK_WDT_MODE_KEY \| MTK_WDT_MODE_EXTEN));
	mmio_setbits_32(MTK_WDT_SWRST, MTK_WDT_SWRST_KEY);

	wfi();
	ERROR("MTK System Reset: operation not handled.\n");
	panic();
	}

	/*******************************************************************************
	* Export the platform handlers to enable psci to invoke them
	******************************************************************************/
	static const plat_pm_ops_t plat_plat_pm_ops = {
	.affinst_standby = plat_affinst_standby,
	.affinst_on = plat_affinst_on,
	.affinst_off = plat_affinst_off,
	.affinst_suspend = plat_affinst_suspend,
	.affinst_on_finish = plat_affinst_on_finish,
	.affinst_suspend_finish = plat_affinst_suspend_finish,
	.system_off = plat_system_off,
	.system_reset = plat_system_reset,
	.get_sys_suspend_power_state = plat_get_sys_suspend_power_state,
	};

	/*******************************************************************************
	* Export the platform specific power ops & initialize the mtk_platform power
	* controller
	******************************************************************************/
	int platform_setup_pm(const plat_pm_ops_t **plat_ops)
	{
	*plat_ops = &plat_plat_pm_ops;
	return 0;
	}