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cpuidle: calxeda: add support to use PSCI calls 

This updates the Calxeda cpuidle driver to use PSCI calls to powergate
cores. This also enables cpuidle for the ECX-2000.

This could possibly become a generic PSCI driver, but there are no other
PSCI users in the kernel other than mach-virt.

Signed-off-by: Rob Herring <rob.herring@calxeda.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-pm@vger.kernel.org
hifive-unleashed-5.1
Rob Herring 2013-02-26 16:05:46 -06:00
parent 60a66e3700
commit a410146c3e
3 changed files with 8 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/arm/mach-highbank/highbank.c
View File

@ -168,7 +168,7 @@ static void __init highbank_init(void)
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
if (of_machine_is_compatible("calxeda,highbank"))
if (psci_ops.cpu_suspend)
platform_device_register(&highbank_cpuidle_device);
}

2
drivers/cpuidle/Kconfig.arm
View File

@ -4,7 +4,7 @@
config ARM_HIGHBANK_CPUIDLE
bool "CPU Idle Driver for Calxeda processors"
depends on ARCH_HIGHBANK
depends on ARM_PSCI
select ARM_CPU_SUSPEND
help
Select this to enable cpuidle on Calxeda processors.

39
drivers/cpuidle/cpuidle-calxeda.c
View File

@ -23,44 +23,18 @@
#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/suspend.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <asm/cpuidle.h>
#include <asm/proc-fns.h>
#include <asm/smp_scu.h>
#include <asm/suspend.h>
#include <asm/cacheflush.h>
#include <asm/cp15.h>
extern void highbank_set_cpu_jump(int cpu, void *jump_addr);
extern void __iomem *scu_base_addr;
static noinline void calxeda_idle_restore(void)
{
set_cr(get_cr() | CR_C);
set_auxcr(get_auxcr() | 0x40);
scu_power_mode(scu_base_addr, SCU_PM_NORMAL);
}
#include <asm/psci.h>
static int calxeda_idle_finish(unsigned long val)
{
/* Already flushed cache, but do it again as the outer cache functions
* dirty the cache with spinlocks */
flush_cache_all();
set_auxcr(get_auxcr() & ~0x40);
set_cr(get_cr() & ~CR_C);
scu_power_mode(scu_base_addr, SCU_PM_DORMANT);
cpu_do_idle();
/* Restore things if we didn't enter power-gating */
calxeda_idle_restore();
return 1;
const struct psci_power_state ps = {
.type = PSCI_POWER_STATE_TYPE_POWER_DOWN,
};
return psci_ops.cpu_suspend(ps, __pa(cpu_resume));
}
static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
@ -68,7 +42,6 @@ static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
int index)
{
cpu_pm_enter();
highbank_set_cpu_jump(smp_processor_id(), cpu_resume);
cpu_suspend(0, calxeda_idle_finish);
cpu_pm_exit();