1 files changed, 498 insertions, 0 deletions

diff --git a/arch/arm/mach-exynos/busfreq_opp_exynos5.c b/arch/arm/mach-exynos/busfreq_opp_exynos5.c
new file mode 100644
index 0000000..b685cd2
--- /dev/null
+++ b/arch/arm/mach-exynos/busfreq_opp_exynos5.c
@@ -0,0 +1,498 @@
+/* linux/arch/arm/mach-exynos/busfreq_opp_exynos5.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *		http://www.samsung.com/
+ *
+ * EXYNOS4 - BUS clock frequency scaling support with OPP
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/cpu.h>
+#include <linux/ktime.h>
+#include <linux/tick.h>
+#include <linux/kernel_stat.h>
+#include <linux/suspend.h>
+#include <linux/reboot.h>
+#include <linux/slab.h>
+#include <linux/opp.h>
+#include <linux/clk.h>
+#include <linux/workqueue.h>
+
+#include <asm/mach-types.h>
+
+#include <mach/ppmu.h>
+#include <mach/map.h>
+#include <mach/regs-clock.h>
+#include <mach/gpio.h>
+#include <mach/regs-mem.h>
+#include <mach/cpufreq.h>
+#include <mach/dev.h>
+#include <mach/busfreq_exynos5.h>
+
+#include <plat/map-s5p.h>
+#include <plat/cpu.h>
+#include <plat/clock.h>
+
+#define BUSFREQ_DEBUG	1
+
+static DEFINE_MUTEX(busfreq_lock);
+BLOCKING_NOTIFIER_HEAD(exynos_busfreq_notifier_list);
+
+struct busfreq_control {
+	struct opp *lock[PPMU_TYPE_END];
+	struct device *dev[PPMU_TYPE_END];
+};
+
+static struct busfreq_control bus_ctrl;
+
+void update_busfreq_stat(struct busfreq_data *data,
+		enum ppmu_type type, unsigned int index)
+{
+#ifdef BUSFREQ_DEBUG
+	unsigned long long cur_time = get_jiffies_64();
+	data->time_in_state[type][index] =
+		cputime64_add(data->time_in_state[type][index], cputime_sub(cur_time, data->last_time[type]));
+	data->last_time[type] = cur_time;
+#endif
+}
+
+
+static unsigned long __maybe_unused step_up(struct busfreq_data *data,
+				enum ppmu_type type, int step)
+{
+	int i;
+	struct opp *opp;
+	unsigned long newfreq = data->curr_freq[type];
+
+	if (data->max_freq[type] == data->curr_freq[type])
+		return newfreq;
+
+	for (i = 0; i < step; i++) {
+		newfreq += 1;
+		opp = opp_find_freq_ceil(data->dev[type], &newfreq);
+
+		if (opp_get_freq(opp) == data->max_freq[type])
+			break;
+	}
+
+	return newfreq;
+}
+
+unsigned long step_down(struct busfreq_data *data,
+			enum ppmu_type type, int step)
+{
+	int i;
+	struct opp *opp;
+	unsigned long newfreq = data->curr_freq[type];
+
+	if (data->min_freq[type] == data->curr_freq[type])
+		return newfreq;
+
+	for (i = 0; i < step; i++) {
+		newfreq -= 1;
+		opp = opp_find_freq_floor(data->dev[type], &newfreq);
+
+		if (opp_get_freq(opp) == data->min_freq[type])
+			break;
+	}
+
+	return newfreq;
+}
+
+static void _target(struct busfreq_data *data,
+		enum ppmu_type type, unsigned long newfreq)
+{
+	struct opp *opp;
+	unsigned int voltage;
+	int index;
+
+	opp = opp_find_freq_exact(data->dev[type], newfreq, true);
+
+	if (bus_ctrl.lock[type]) {
+		opp = bus_ctrl.lock[type];
+		newfreq = opp_get_freq(opp);
+	}
+
+	index = data->get_table_index(newfreq, type);
+
+	if (newfreq == 0 || newfreq == data->curr_freq[type] ||
+			data->use == false) {
+		update_busfreq_stat(data, type, index);
+		return;
+	}
+
+	voltage = opp_get_voltage(opp);
+
+	if (newfreq > data->curr_freq[type]) {
+		regulator_set_voltage(data->vdd_reg[type], voltage,
+				voltage + 25000);
+		if (type == PPMU_MIF && data->busfreq_prepare)
+			data->busfreq_prepare(index);
+	}
+
+	data->target(data, type, index);
+
+	if (newfreq < data->curr_freq[type]) {
+		if (type == PPMU_MIF && data->busfreq_post)
+			data->busfreq_post(index);
+		regulator_set_voltage(data->vdd_reg[type], voltage,
+				voltage + 25000);
+	}
+	data->curr_freq[type] = newfreq;
+
+	update_busfreq_stat(data, type, index);
+}
+
+static void exynos_busfreq_timer(struct work_struct *work)
+{
+	struct delayed_work *delayed_work = to_delayed_work(work);
+	struct busfreq_data *data = container_of(delayed_work, struct busfreq_data,
+			worker);
+	int i;
+	struct opp *opp[PPMU_TYPE_END];
+	unsigned long newfreq;
+
+	data->monitor(data, &opp[PPMU_MIF], &opp[PPMU_INT]);
+
+	ppmu_start(data->dev[PPMU_MIF]);
+
+	mutex_lock(&busfreq_lock);
+
+	for (i = PPMU_MIF; i < PPMU_TYPE_END; i++) {
+		newfreq = opp_get_freq(opp[i]);
+		_target(data, i, newfreq);
+	}
+
+	mutex_unlock(&busfreq_lock);
+	queue_delayed_work(system_freezable_wq, &data->worker, data->sampling_rate);
+}
+
+static int exynos_buspm_notifier_event(struct notifier_block *this,
+		unsigned long event, void *ptr)
+{
+	struct busfreq_data *data = container_of(this, struct busfreq_data,
+			exynos_buspm_notifier);
+	int i;
+
+	switch (event) {
+	case PM_SUSPEND_PREPARE:
+		mutex_lock(&busfreq_lock);
+		for (i = PPMU_MIF; i < PPMU_TYPE_END; i++)
+			_target(data, i, data->max_freq[i]);
+		mutex_unlock(&busfreq_lock);
+		data->use = false;
+		return NOTIFY_OK;
+	case PM_POST_RESTORE:
+	case PM_POST_SUSPEND:
+		data->use = true;
+		return NOTIFY_OK;
+	}
+	return NOTIFY_DONE;
+}
+
+static int exynos_busfreq_reboot_event(struct notifier_block *this,
+		unsigned long code, void *unused)
+{
+	struct busfreq_data *data = container_of(this, struct busfreq_data,
+			exynos_reboot_notifier);
+	int i;
+	struct opp *opp;
+	unsigned int voltage[PPMU_TYPE_END];
+	for (i = PPMU_MIF; i < PPMU_TYPE_END; i++) {
+		opp = opp_find_freq_exact(data->dev[i], data->max_freq[i], true);
+		voltage[i] = opp_get_voltage(opp);
+
+		regulator_set_voltage(data->vdd_reg[i], voltage[i], voltage[i] + 25000);
+	}
+	data->use = false;
+
+	printk(KERN_INFO "REBOOT Notifier for BUSFREQ\n");
+	return NOTIFY_DONE;
+}
+
+static int exynos_busfreq_request_event(struct notifier_block *this,
+		unsigned long req_newfreq, void *device)
+{
+	struct busfreq_data *data = container_of(this, struct busfreq_data,
+			exynos_request_notifier);
+	int i;
+	struct opp *opp[PPMU_TYPE_END];
+	unsigned long newfreq[PPMU_TYPE_END];
+	unsigned long freq;
+
+	if (req_newfreq == 0 || data->use == false)
+		return -EINVAL;
+
+	mutex_lock(&busfreq_lock);
+
+	newfreq[PPMU_MIF] = (req_newfreq / 1000) * 1000;
+	newfreq[PPMU_INT] = (req_newfreq % 1000) * 1000;
+
+	for (i = PPMU_MIF; i < PPMU_TYPE_END; i++) {
+		opp[i] = opp_find_freq_ceil(data->dev[i], &newfreq[i]);
+		freq = opp_get_freq(opp[i]);
+		if (freq > data->curr_freq[i])
+			_target(data, i, freq);
+	}
+
+	mutex_unlock(&busfreq_lock);
+	printk(KERN_INFO "REQUEST Notifier for BUSFREQ\n");
+	return NOTIFY_DONE;
+}
+
+int exynos_busfreq_lock(unsigned int nId,
+	enum busfreq_level_request busfreq_level)
+{
+	return 0;
+}
+
+void exynos_busfreq_lock_free(unsigned int nId)
+{
+}
+
+static ssize_t show_level_lock(struct device *device,
+		struct device_attribute *attr, char *buf)
+{
+	struct platform_device *pdev = to_platform_device(bus_ctrl.dev[PPMU_MIF]);
+	struct busfreq_data *data = (struct busfreq_data *)platform_get_drvdata(pdev);
+	int len = 0;
+	unsigned long mif_freq, int_freq;
+
+	mif_freq = bus_ctrl.lock[PPMU_MIF] == NULL ? 0 : opp_get_freq(bus_ctrl.lock[PPMU_MIF]);
+	int_freq = bus_ctrl.lock[PPMU_INT] == NULL ? 0 : opp_get_freq(bus_ctrl.lock[PPMU_INT]);
+
+	len = sprintf(buf, "Current Freq(MIF/INT) : (%lu - %lu)\n",
+			data->curr_freq[PPMU_MIF], data->curr_freq[PPMU_INT]);
+	len += sprintf(buf + len, "Current Lock Freq(MIF/INT) : (%lu - %lu)\n", mif_freq, int_freq);
+
+	return len;
+}
+
+static ssize_t store_level_lock(struct device *device, struct device_attribute *attr,
+		const char *buf, size_t count)
+{
+	struct platform_device *pdev = to_platform_device(bus_ctrl.dev[PPMU_MIF]);
+	struct busfreq_data *data = (struct busfreq_data *)platform_get_drvdata(pdev);
+	struct opp *opp[PPMU_TYPE_END];
+	unsigned long freq[PPMU_TYPE_END];
+	int i;
+	int ret;
+
+	ret = sscanf(buf, "%lu %lu", &freq[PPMU_MIF], &freq[PPMU_INT]);
+	if (freq[PPMU_MIF] == 0 || freq[PPMU_INT] == 0 || ret != 2) {
+		pr_info("Release bus level lock.\n");
+		bus_ctrl.lock[PPMU_MIF] = NULL;
+		bus_ctrl.lock[PPMU_INT] = NULL;
+		return count;
+	}
+
+	for (i = PPMU_MIF; i < PPMU_TYPE_END; i++) {
+		if (freq[i] > data->max_freq[i])
+			freq[i] = data->max_freq[i];
+
+		opp[i] = opp_find_freq_ceil(bus_ctrl.dev[i], &freq[i]);
+		bus_ctrl.lock[i] = opp[i];
+	}
+	pr_info("Lock Freq : MIF/INT(%lu - %lu)\n", opp_get_freq(opp[PPMU_MIF]), opp_get_freq(opp[PPMU_INT]));
+	return count;
+}
+
+static ssize_t show_locklist(struct device *device,
+		struct device_attribute *attr, char *buf)
+{
+	return dev_lock_list(bus_ctrl.dev[PPMU_MIF], buf);
+}
+
+static ssize_t show_time_in_state(struct device *device,
+		struct device_attribute *attr, char *buf)
+{
+	struct platform_device *pdev = to_platform_device(bus_ctrl.dev[PPMU_MIF]);
+	struct busfreq_data *data = (struct busfreq_data *)platform_get_drvdata(pdev);
+	struct busfreq_table *table;
+	ssize_t len = 0;
+	int i;
+
+	table = data->table[PPMU_MIF];
+	len += sprintf(buf, "%s\n", "MIF stat");
+	for (i = LV_0; i < LV_MIF_END; i++)
+		len += sprintf(buf + len, "%u %llu\n", table[i].mem_clk,
+				(unsigned long long)cputime64_to_clock_t(data->time_in_state[PPMU_MIF][i]));
+
+	table = data->table[PPMU_INT];
+	len += sprintf(buf + len, "\n%s\n", "INT stat");
+	for (i = LV_0; i < LV_INT_END; i++)
+		len += sprintf(buf + len, "%u %llu\n", table[i].mem_clk,
+				(unsigned long long)cputime64_to_clock_t(data->time_in_state[PPMU_INT][i]));
+	return len;
+}
+
+static DEVICE_ATTR(curr_freq, 0664, show_level_lock, store_level_lock);
+static DEVICE_ATTR(lock_list, 0664, show_locklist, NULL);
+static DEVICE_ATTR(time_in_state, 0664, show_time_in_state, NULL);
+
+static struct attribute *busfreq_attributes[] = {
+	&dev_attr_curr_freq.attr,
+	&dev_attr_lock_list.attr,
+	&dev_attr_time_in_state.attr,
+	NULL
+};
+
+int exynos_request_register(struct notifier_block *n)
+{
+	return blocking_notifier_chain_register(&exynos_busfreq_notifier_list, n);
+}
+
+void exynos_request_apply(unsigned long freq)
+{
+	blocking_notifier_call_chain(&exynos_busfreq_notifier_list, freq, NULL);
+}
+
+static __devinit int exynos_busfreq_probe(struct platform_device *pdev)
+{
+	struct busfreq_data *data;
+
+	data = kzalloc(sizeof(struct busfreq_data), GFP_KERNEL);
+	if (!data) {
+		pr_err("Unable to create busfreq_data struct.\n");
+		return -ENOMEM;
+	}
+
+	data->exynos_buspm_notifier.notifier_call =
+		exynos_buspm_notifier_event;
+	data->exynos_reboot_notifier.notifier_call =
+		exynos_busfreq_reboot_event;
+	data->busfreq_attr_group.attrs = busfreq_attributes;
+	data->exynos_request_notifier.notifier_call =
+		exynos_busfreq_request_event;
+
+	INIT_DELAYED_WORK(&data->worker, exynos_busfreq_timer);
+
+	if (soc_is_exynos5250()) {
+		data->init = exynos5250_init;
+	} else {
+		pr_err("Unsupport device type.\n");
+		goto err_busfreq;
+	}
+
+	if (data->init(&pdev->dev, data)) {
+		pr_err("Failed to init busfreq.\n");
+		goto err_busfreq;
+	}
+
+	bus_ctrl.dev[PPMU_MIF] =  data->dev[PPMU_MIF];
+	bus_ctrl.dev[PPMU_INT] =  data->dev[PPMU_INT];
+
+	data->last_time[PPMU_MIF] = get_jiffies_64();
+	data->last_time[PPMU_INT] = get_jiffies_64();
+
+	data->busfreq_kobject = kobject_create_and_add("busfreq",
+				&cpu_sysdev_class.kset.kobj);
+	if (!data->busfreq_kobject)
+		pr_err("Failed to create busfreq kobject.!\n");
+
+	if (sysfs_create_group(data->busfreq_kobject, &data->busfreq_attr_group))
+		pr_err("Failed to create attributes group.!\n");
+
+	if (register_pm_notifier(&data->exynos_buspm_notifier)) {
+		pr_err("Failed to setup buspm notifier\n");
+		goto err_busfreq;
+	}
+
+	data->use = true;
+
+	if (register_reboot_notifier(&data->exynos_reboot_notifier))
+		pr_err("Failed to setup reboot notifier\n");
+
+	if (exynos_request_register(&data->exynos_request_notifier))
+		pr_err("Failed to setup request notifier\n");
+
+	platform_set_drvdata(pdev, data);
+
+	queue_delayed_work(system_freezable_wq, &data->worker, data->sampling_rate);
+	return 0;
+
+err_busfreq:
+	if (!IS_ERR(data->vdd_reg[PPMU_INT]))
+		regulator_put(data->vdd_reg[PPMU_INT]);
+
+	if (!IS_ERR(data->vdd_reg[PPMU_MIF]))
+		regulator_put(data->vdd_reg[PPMU_MIF]);
+
+	kfree(data);
+	return -ENODEV;
+}
+
+static __devexit int exynos_busfreq_remove(struct platform_device *pdev)
+{
+	struct busfreq_data *data = platform_get_drvdata(pdev);
+
+	unregister_pm_notifier(&data->exynos_buspm_notifier);
+	unregister_reboot_notifier(&data->exynos_reboot_notifier);
+	regulator_put(data->vdd_reg[PPMU_INT]);
+	regulator_put(data->vdd_reg[PPMU_MIF]);
+	sysfs_remove_group(data->busfreq_kobject, &data->busfreq_attr_group);
+	kfree(data);
+
+	return 0;
+}
+
+static int exynos_busfreq_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct busfreq_data *data = (struct busfreq_data *)platform_get_drvdata(pdev);
+
+	if (data->busfreq_suspend)
+		data->busfreq_suspend();
+	return 0;
+}
+
+static int exynos_busfreq_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct busfreq_data *data = (struct busfreq_data *)platform_get_drvdata(pdev);
+	ppmu_reset(dev);
+
+	if (data->busfreq_resume)
+		data->busfreq_resume();
+	return 0;
+}
+
+static const struct dev_pm_ops exynos_busfreq_pm = {
+	.suspend = exynos_busfreq_suspend,
+	.resume = exynos_busfreq_resume,
+};
+
+static struct platform_driver exynos_busfreq_driver = {
+	.probe  = exynos_busfreq_probe,
+	.remove = __devexit_p(exynos_busfreq_remove),
+	.driver = {
+		.name   = "exynos-busfreq",
+		.owner  = THIS_MODULE,
+		.pm     = &exynos_busfreq_pm,
+	},
+};
+
+static int __init exynos_busfreq_init(void)
+{
+	return platform_driver_register(&exynos_busfreq_driver);
+}
+late_initcall(exynos_busfreq_init);
+
+static void __exit exynos_busfreq_exit(void)
+{
+	platform_driver_unregister(&exynos_busfreq_driver);
+}
+module_exit(exynos_busfreq_exit);