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ARM: OMAP4: PM: Program CPU1 to hit OFF when off-lined 

Program non-boot CPUs to hit lowest supported power state
when it is off-lined using cpu hotplug framework.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Jean Pihet <j-pihet@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Tested-by: Vishwanath BS <vishwanath.bs@ti.com>
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Santosh Shilimkar 2010-06-16 22:19:48 +05:30 committed by Kevin Hilman
parent a6e48358d1
commit b5b4f2881f
4 changed files with 80 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
arch/arm/mach-omap2/common.h
View File

@ -200,6 +200,7 @@ extern int omap4_mpuss_init(void);
extern int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state);
extern int omap4_finish_suspend(unsigned long cpu_state);
extern void omap4_cpu_resume(void);
extern int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state);
#else
static inline int omap4_enter_lowpower(unsigned int cpu,
unsigned int power_state)
@ -208,6 +209,12 @@ static inline int omap4_enter_lowpower(unsigned int cpu,
return 0;
}
static inline int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
{
cpu_do_idle();
return 0;
}
static inline int omap4_mpuss_init(void)
{
return 0;

14
arch/arm/mach-omap2/omap-hotplug.c
View File

@ -22,6 +22,8 @@
#include "common.h"
#include "powerdomain.h"
int platform_cpu_kill(unsigned int cpu)
{
return 1;
@ -33,6 +35,8 @@ int platform_cpu_kill(unsigned int cpu)
*/
void platform_cpu_die(unsigned int cpu)
{
unsigned int this_cpu;
flush_cache_all();
dsb();
@ -40,15 +44,15 @@ void platform_cpu_die(unsigned int cpu)
* we're ready for shutdown now, so do it
*/
if (omap_modify_auxcoreboot0(0x0, 0x200) != 0x0)
printk(KERN_CRIT "Secure clear status failed\n");
pr_err("Secure clear status failed\n");
for (;;) {
/*
* Execute WFI
* Enter into low power state
*/
do_wfi();
if (omap_read_auxcoreboot0() == cpu) {
omap4_hotplug_cpu(cpu, PWRDM_POWER_OFF);
this_cpu = smp_processor_id();
if (omap_read_auxcoreboot0() == this_cpu) {
/*
* OK, proper wakeup, we're done
*/

32
arch/arm/mach-omap2/omap-mpuss-lowpower.c
View File

@ -192,6 +192,38 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state)
return 0;
}
/**
* omap4_hotplug_cpu: OMAP4 CPU hotplug entry
* @cpu : CPU ID
* @power_state: CPU low power state.
*/
int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state)
{
unsigned int cpu_state = 0;
if (omap_rev() == OMAP4430_REV_ES1_0)
return -ENXIO;
if (power_state == PWRDM_POWER_OFF)
cpu_state = 1;
clear_cpu_prev_pwrst(cpu);
set_cpu_next_pwrst(cpu, power_state);
set_cpu_wakeup_addr(cpu, virt_to_phys(omap_secondary_startup));
scu_pwrst_prepare(cpu, power_state);
/*
* CPU never retuns back if targetted power state is OFF mode.
* CPU ONLINE follows normal CPU ONLINE ptah via
* omap_secondary_startup().
*/
omap4_finish_suspend(cpu_state);
set_cpu_next_pwrst(cpu, PWRDM_POWER_ON);
return 0;
}
/*
* Initialise OMAP4 MPUSS
*/

32
arch/arm/mach-omap2/omap-wakeupgen.c
View File

@ -180,6 +180,36 @@ static void wakeupgen_irqmask_all(unsigned int cpu, unsigned int set)
spin_unlock_irqrestore(&wakeupgen_lock, flags);
}
#ifdef CONFIG_HOTPLUG_CPU
static int __cpuinit irq_cpu_hotplug_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned int)hcpu;
switch (action) {
case CPU_ONLINE:
wakeupgen_irqmask_all(cpu, 0);
break;
case CPU_DEAD:
wakeupgen_irqmask_all(cpu, 1);
break;
}
return NOTIFY_OK;
}
static struct notifier_block __refdata irq_hotplug_notifier = {
.notifier_call = irq_cpu_hotplug_notify,
};
static void __init irq_hotplug_init(void)
{
register_hotcpu_notifier(&irq_hotplug_notifier);
}
#else
static void __init irq_hotplug_init(void)
{}
#endif
/*
* Initialise the wakeupgen module.
*/
@ -222,5 +252,7 @@ int __init omap_wakeupgen_init(void)
for (i = 0; i < NR_IRQS; i++)
irq_target_cpu[i] = boot_cpu;
irq_hotplug_init();
return 0;
}