cpufreq: cpufreq_interactive: avoid NULL point access

[firefly-linux-kernel-4.4.55.git] / drivers / cpuidle / cpuidle-calxeda.c

diff --git a/drivers/cpuidle/cpuidle-calxeda.c b/drivers/cpuidle/cpuidle-calxeda.c
index 0e6e408c0a630b71c466f3fabaa7decd1b97fed0..ea9728fde9b3c8b1c1e79426d0ec056ce0e518fd 100644 (file)
--- a/drivers/cpuidle/cpuidle-calxeda.c
+++ b/drivers/cpuidle/cpuidle-calxeda.c
@@ -21,53 +21,35 @@
  */
 
 #include <linux/cpuidle.h>
+#include <linux/cpu_pm.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 <linux/mm.h>
+#include <linux/platform_device.h>
+#include <linux/psci.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 *scu_base_addr;
+#include <uapi/linux/psci.h>
 
-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);
-}
+#define CALXEDA_IDLE_PARAM \
+       ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
+        (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
+        (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))
 
 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;
+       return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __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_pm_enter();
        cpu_suspend(0, calxeda_idle_finish);
+       cpu_pm_exit();
+
        return index;
 }
 
@@ -78,7 +60,6 @@ static struct cpuidle_driver calxeda_idle_driver = {
                {
                        .name = "PG",
                        .desc = "Power Gate",
-                       .flags = CPUIDLE_FLAG_TIME_VALID,
                        .exit_latency = 30,
                        .power_usage = 50,
                        .target_residency = 200,
@@ -88,11 +69,15 @@ static struct cpuidle_driver calxeda_idle_driver = {
        .state_count = 2,
 };
 
-static int __init calxeda_cpuidle_init(void)
+static int calxeda_cpuidle_probe(struct platform_device *pdev)
 {
-       if (!of_machine_is_compatible("calxeda,highbank"))
-               return -ENODEV;
-
        return cpuidle_register(&calxeda_idle_driver, NULL);
 }
-module_init(calxeda_cpuidle_init);
+
+static struct platform_driver calxeda_cpuidle_plat_driver = {
+        .driver = {
+                .name = "cpuidle-calxeda",
+        },
+        .probe = calxeda_cpuidle_probe,
+};
+builtin_platform_driver(calxeda_cpuidle_plat_driver);