linux-kernel - [PATCH 1/6] cpuidle: calxeda: add support to use PSCI calls

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1380248694-13388-2-git-send-email-robherring2@gmail.com>
Date:	Thu, 26 Sep 2013 21:24:49 -0500
From:	Rob Herring <robherring2@...il.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:	Rob Herring <rob.herring@...xeda.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-pm@...r.kernel.org
Subject: [PATCH 1/6] cpuidle: calxeda: add support to use PSCI calls

From: Rob Herring <rob.herring@...xeda.com>

This updates the Calxeda cpuidle driver to use PSCI calls to powergate
cores. This is needed to enable 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@...xeda.com>
Cc: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: linux-pm@...r.kernel.org
---
 drivers/cpuidle/Kconfig.arm       |  2 +-
 drivers/cpuidle/cpuidle-calxeda.c | 40 ++++++---------------------------------
 2 files changed, 7 insertions(+), 35 deletions(-)

diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 8e36603..d6f57d5 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -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.
diff --git a/drivers/cpuidle/cpuidle-calxeda.c b/drivers/cpuidle/cpuidle-calxeda.c
index 3460584..01cfecf3 100644
--- a/drivers/cpuidle/cpuidle-calxeda.c
+++ b/drivers/cpuidle/cpuidle-calxeda.c
@@ -22,51 +22,23 @@
 
 #include <linux/cpuidle.h>
 #include <linux/init.h>
-#include <linux/io.h>
 #include <linux/of.h>
-#include <linux/time.h>
-#include <linux/delay.h>
-#include <linux/suspend.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,
 				struct cpuidle_driver *drv,
 				int index)
 {
-	highbank_set_cpu_jump(smp_processor_id(), cpu_resume);
 	cpu_suspend(0, calxeda_idle_finish);
 	return index;
 }
@@ -90,7 +62,7 @@ static struct cpuidle_driver calxeda_idle_driver = {
 
 static int __init calxeda_cpuidle_init(void)
 {
-	if (!of_machine_is_compatible("calxeda,highbank"))
+	if (!of_machine_is_compatible("calxeda,highbank") || !psci_ops.cpu_suspend)
 		return -ENODEV;
 
 	return cpuidle_register(&calxeda_idle_driver, NULL);
-- 
1.8.1.2

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/