qcom: core_ctl: Add support functions for core control

Add support functions for core control driver. Also introduce
Kconfig for enabling core control.

Change-Id: Ic127b6ed7d9450338883b13d9c42abfe49ff8b35
Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
[satyap: trivial merge conflict resolution]
Signed-off-by: Satya Durga Srinivasu Prabhala <satyap@codeaurora.org>

drivers/soc/qcom/Kconfig

@@ -543,4 +543,12 @@ config MSM_KERNEL_PROTECT_TEST
           read-only.  This test is FATAL whether it passes or fails!
           Success is signaled by a stage-2 fault.
 
+config MSM_CORE_CTL_HELPER
+	tristate "Core control helper functions for dynamically hotplug CPUs"
+	help
+	  Provide helper functions for core control driver. Core control
+	  driver dynamically hotplugs CPUs from kernel based on current
+	  system load and state. It also supports limiting min and
+	  max online CPUs from userspace.
+
 source "drivers/soc/qcom/memshare/Kconfig"

drivers/soc/qcom/Makefile

@@ -30,6 +30,7 @@ obj-$(CONFIG_MEM_SHARE_QMI_SERVICE)		+= memshare/
 obj-$(CONFIG_MSM_PIL_SSR_GENERIC) += subsys-pil-tz.o
 obj-$(CONFIG_MSM_PIL_MSS_QDSP6V5) += pil-q6v5.o pil-msa.o pil-q6v5-mss.o
 obj-$(CONFIG_MSM_PIL)   +=      peripheral-loader.o
+obj-$(CONFIG_MSM_CORE_CTL_HELPER) += core_ctl_helper.o
 
 ifdef CONFIG_MSM_SUBSYSTEM_RESTART
 	obj-y += subsystem_notif.o

drivers/soc/qcom/core_ctl_helper.c

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/ktime.h>
+#include <linux/hrtimer.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <soc/qcom/core_ctl.h>
+
+void core_ctl_block_hotplug(void)
+{
+	get_online_cpus();
+}
+EXPORT_SYMBOL(core_ctl_block_hotplug);
+
+void core_ctl_unblock_hotplug(void)
+{
+	put_online_cpus();
+}
+EXPORT_SYMBOL(core_ctl_unblock_hotplug);
+
+s64 core_ctl_get_time(void)
+{
+	return ktime_to_ms(ktime_get());
+}
+EXPORT_SYMBOL(core_ctl_get_time);
+
+struct cpufreq_policy *core_ctl_get_policy(int cpu)
+{
+	return cpufreq_cpu_get(cpu);
+}
+EXPORT_SYMBOL(core_ctl_get_policy);
+
+void core_ctl_put_policy(struct cpufreq_policy *policy)
+{
+	cpufreq_cpu_put(policy);
+}
+EXPORT_SYMBOL(core_ctl_put_policy);
+
+struct device *core_ctl_find_cpu_device(unsigned cpu)
+{
+	return get_cpu_device(cpu);
+}
+EXPORT_SYMBOL(core_ctl_find_cpu_device);
+
+int __ref core_ctl_online_core(unsigned int cpu)
+{
+	return cpu_up(cpu);
+}
+EXPORT_SYMBOL(core_ctl_online_core);

include/soc/qcom/core_ctl.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __SOC_QCOM_CORE_CTL_H
+#define __SOC_QCOM_CORE_CTL_H
+
+extern void core_ctl_block_hotplug(void);
+extern void core_ctl_unblock_hotplug(void);
+extern s64 core_ctl_get_time(void);
+extern struct cpufreq_policy *core_ctl_get_policy(int cpu);
+extern void core_ctl_put_policy(struct cpufreq_policy *policy);
+extern struct device *core_ctl_find_cpu_device(unsigned cpu);
+extern int core_ctl_online_core(unsigned int cpu);
+
+#endif