/*
* The framework loads the hibernation image into a linked list anchored
* at restore_pblist, for swsusp_arch_resume() to copy back to the proper
* destinations.
*
* To make this work if resume is triggered from initramfs, the
* pagetables need to be switched to allow writes to kernel mem.
*/
void notrace mtk_arch_restore_image(void)
{
phys_reset_t phys_reset;
struct pbe *pbe;
for (pbe = restore_pblist; pbe; pbe = pbe->next)
copy_page(pbe->orig_address, pbe->address);
#if 0 /* [ALPS01496758] since CA17 has cache bug, replace with the modified assemlby version */
/* Clean and invalidate caches */
flush_cache_all();
/* Turn off caching */
cpu_proc_fin();
/* Push out any further dirty data, and ensure cache is empty */
flush_cache_all();
#else
__disable_dcache__inner_flush_dcache_L1__inner_flush_dcache_L2();
#endif
/* Take out a flat memory mapping. */
setup_mm_for_reboot();
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
/* Return from cpu_suspend/swsusp_arch_suspend */
phys_reset((unsigned long)virt_to_phys(cpu_resume));
/* Should never get here. */
BUG();
}
static void __soft_restart(void *addr)
{
phys_reset_t phys_reset;
/* Take out a flat memory mapping. */
setup_mm_for_reboot();
/* Clean and invalidate caches */
flush_cache_all();
/* Turn off caching */
cpu_proc_fin();
/* Push out any further dirty data, and ensure cache is empty */
flush_cache_all();
/* Push out the dirty data from external caches */
outer_disable();
/* Switch to the identity mapping. */
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset((unsigned long)addr);
/* Should never get here. */
BUG();
}
void mcpm_cpu_suspend(u64 expected_residency)
{
phys_reset_t phys_reset;
BUG_ON(!platform_ops);
BUG_ON(!irqs_disabled());
/* Very similar to mcpm_cpu_power_down() */
setup_mm_for_reboot();
platform_ops->suspend(expected_residency);
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset(virt_to_phys(mcpm_entry_point));
BUG();
}
void mcpm_cpu_power_down(void)
{
phys_reset_t phys_reset;
if (WARN_ON_ONCE(!platform_ops || !platform_ops->power_down))
return;
BUG_ON(!irqs_disabled());
/*
* Do this before calling into the power_down method,
* as it might not always be safe to do afterwards.
*/
setup_mm_for_reboot();
platform_ops->power_down();
/*
* It is possible for a power_up request to happen concurrently
* with a power_down request for the same CPU. In this case the
* power_down method might not be able to actually enter a
* powered down state with the WFI instruction if the power_up
* method has removed the required reset condition. The
* power_down method is then allowed to return. We must perform
* a re-entry in the kernel as if the power_up method just had
* deasserted reset on the CPU.
*
* To simplify race issues, the platform specific implementation
* must accommodate for the possibility of unordered calls to
* power_down and power_up with a usage count. Therefore, if a
* call to power_up is issued for a CPU that is not down, then
* the next call to power_down must not attempt a full shutdown
* but only do the minimum (normally disabling L1 cache and CPU
* coherency) and return just as if a concurrent power_up request
* had happened as described above.
*/
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset(virt_to_phys(mcpm_entry_point));
/* should never get here */
BUG();
}
static int __init nocache_trampoline(unsigned long _arg)
{
void (*cache_disable)(void) = (void *)_arg;
unsigned int mpidr = read_cpuid_mpidr();
unsigned int cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
unsigned int cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
phys_reset_t phys_reset;
mcpm_set_entry_vector(cpu, cluster, cpu_resume);
setup_mm_for_reboot();
__mcpm_cpu_going_down(cpu, cluster);
BUG_ON(!__mcpm_outbound_enter_critical(cpu, cluster));
cache_disable();
__mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
__mcpm_cpu_down(cpu, cluster);
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset(virt_to_phys(mcpm_entry_point));
BUG();
}
void mcpm_cpu_power_down(void)
{
unsigned int mpidr, cpu, cluster;
bool cpu_going_down, last_man;
phys_reset_t phys_reset;
mpidr = read_cpuid_mpidr();
cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
if (WARN_ON_ONCE(!platform_ops))
return;
BUG_ON(!irqs_disabled());
setup_mm_for_reboot();
__mcpm_cpu_going_down(cpu, cluster);
arch_spin_lock(&mcpm_lock);
BUG_ON(__mcpm_cluster_state(cluster) != CLUSTER_UP);
mcpm_cpu_use_count[cluster][cpu]--;
BUG_ON(mcpm_cpu_use_count[cluster][cpu] != 0 &&
mcpm_cpu_use_count[cluster][cpu] != 1);
cpu_going_down = !mcpm_cpu_use_count[cluster][cpu];
last_man = mcpm_cluster_unused(cluster);
if (last_man && __mcpm_outbound_enter_critical(cpu, cluster)) {
platform_ops->cpu_powerdown_prepare(cpu, cluster);
platform_ops->cluster_powerdown_prepare(cluster);
arch_spin_unlock(&mcpm_lock);
platform_ops->cluster_cache_disable();
__mcpm_outbound_leave_critical(cluster, CLUSTER_DOWN);
} else {
if (cpu_going_down)
platform_ops->cpu_powerdown_prepare(cpu, cluster);
arch_spin_unlock(&mcpm_lock);
/*
* If cpu_going_down is false here, that means a power_up
* request raced ahead of us. Even if we do not want to
* shut this CPU down, the caller still expects execution
* to return through the system resume entry path, like
* when the WFI is aborted due to a new IRQ or the like..
* So let's continue with cache cleaning in all cases.
*/
platform_ops->cpu_cache_disable();
}
__mcpm_cpu_down(cpu, cluster);
/* Now we are prepared for power-down, do it: */
if (cpu_going_down)
wfi();
/*
* It is possible for a power_up request to happen concurrently
* with a power_down request for the same CPU. In this case the
* CPU might not be able to actually enter a powered down state
* with the WFI instruction if the power_up request has removed
* the required reset condition. We must perform a re-entry in
* the kernel as if the power_up method just had deasserted reset
* on the CPU.
*/
phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
phys_reset(virt_to_phys(mcpm_entry_point));
/* should never get here */
BUG();
}
