WebSVN - shark - Blame - Rev 775 - /shark/trunk/drivers/cpu/cpufreq/cpufreq.c

Rev	Author	Line No.	Line
582	mauro	1	/*
		2	* Project: S.Ha.R.K.
		3	*
		4	* Coordinators:
		5	* Giorgio Buttazzo <giorgio@sssup.it>
		6	* Paolo Gai <pj@gandalf.sssup.it>
		7	*
		8	* Authors :
		9	* Mauro Marinoni <mauro.marinoni@unipv.it>
		10	*
		11	*
		12	* ReTiS Lab (Scuola Superiore S.Anna - Pisa - Italy)
		13	*
		14	* http://www.sssup.it
		15	* http://retis.sssup.it
		16	* http://shark.sssup.it
		17	*/
		18
		19	/*
		20	* This file was based upon code in Powertweak Linux (http://powertweak.sf.net)
		21	* (C) 2000-2003 Dave Jones, Arjan van de Ven, Janne P�k�� Dominik Brodowski.
		22	*
		23	* Licensed under the terms of the GNU GPL License version 2.
		24	*
		25	* BIG FAT DISCLAIMER: Work in progress code. Possibly dangerous
		26	*/
		27
		28	#include <linuxcomp.h>
		29
		30	#include <linux/config.h>
		31	#include <linux/kernel.h>
		32	#include <linux/module.h>
		33	#include <linux/init.h>
		34	#include <linux/cpufreq.h>
		35	#include <linux/delay.h>
		36	#include <linux/interrupt.h>
		37	#include <linux/spinlock.h>
		38	#include <linux/slab.h>
		39	#include <linux/cpu.h>
		40
768	mauro	41	//extern void kern_scale_timer(unsigned int old_f, unsigned int new_f);
		42	extern void ll_scale_advtimer(unsigned int old_f, unsigned int new_f);
770	mauro	43	extern ssize_t show_available_freqs (struct cpufreq_policy policy, char buf);
775	mauro	44	extern int get_available_freqs (struct cpufreq_policy policy, int buf);
582	mauro	45	/**
		46	* The "cpufreq driver" - the arch- or hardware-dependend low
		47	* level driver of CPUFreq support, and its spinlock. This lock
		48	* also protects the cpufreq_cpu_data array.
		49	*/
597	mauro	50	static struct cpufreq_policy cpufreq_cpu_policy;
		51	static struct cpufreq_policy *cpufreq_cpu_data = &cpufreq_cpu_policy;
582	mauro	52	static struct cpufreq_driver *cpufreq_driver;
		53	static spinlock_t cpufreq_driver_lock = SPIN_LOCK_UNLOCKED;
		54
		55	/*********************************************************************
		56	* USER *
		57	*********************************************************************/
		58
770	mauro	59	inline int cpufreq_target(unsigned int target_freq, unsigned int relation)
582	mauro	60	{
		61	return cpufreq_driver_target(cpufreq_cpu_data, target_freq, relation);
		62	}
		63
770	mauro	64	inline int cpufreq_get_cur_freq(void)
597	mauro	65	{
		66	return cpufreq_cpu_data->cur;
		67	}
		68
770	mauro	69	inline int cpufreq_get_min_freq(void)
597	mauro	70	{
		71	return cpufreq_cpu_data->min;
		72	}
		73
770	mauro	74	inline int cpufreq_get_max_freq(void)
597	mauro	75	{
		76	return cpufreq_cpu_data->max;
		77	}
		78
770	mauro	79	inline int cpufreq_get_latency(void)
597	mauro	80	{
		81	return cpufreq_cpu_data->cpuinfo.transition_latency;
		82	}
		83
775	mauro	84	inline int cpufreq_get_available_freqs(int *buf)
		85	{
		86	return get_available_freqs(cpufreq_cpu_data, buf);
		87	}
		88
770	mauro	89	inline int cpufreq_show_available_freqs(char *buf)
		90	{
		91	return show_available_freqs(cpufreq_cpu_data, buf);
		92	}
		93
582	mauro	94	/*********************************************************************
		95	* GOVERNOR *
		96	*********************************************************************/
		97
		98	int cpufreq_driver_target(struct cpufreq_policy *policy,
		99	unsigned int target_freq,
		100	unsigned int relation)
		101	{
		102	unsigned int ret;
		103
		104	if (!policy)
		105	return -EINVAL;
		106
		107	ret = cpufreq_driver->target(policy, target_freq, relation);
		108
		109	return ret;
		110	}
		111
		112	/*********************************************************************
597	mauro	113	* NOTIFIER *
		114	*********************************************************************/
		115	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
		116	{
		117	switch (state) {
		118	case CPUFREQ_PRECHANGE:
		119	//adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
		120	break;
		121	case CPUFREQ_POSTCHANGE:
		122	//adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
768	mauro	123	//kern_scale_timer(freqs->old, freqs->new);
		124	ll_scale_advtimer(freqs->old, freqs->new);
597	mauro	125	cpufreq_cpu_data->cur = freqs->new;
		126	break;
		127	}
		128	}
		129
		130	/*********************************************************************
582	mauro	131	* REGISTER / UNREGISTER CPUFREQ DRIVER *
		132	*********************************************************************/
		133
		134	/**
		135	* cpufreq_register_driver - register a CPU Frequency driver
		136	* @driver_data: A struct cpufreq_driver containing the values#
		137	* submitted by the CPU Frequency driver.
		138	*
		139	* Registers a CPU Frequency driver to this core code. This code
		140	* returns zero on success, -EBUSY when another driver got here first
		141	* (and isn't unregistered in the meantime).
		142	*
		143	*/
		144	int cpufreq_register_driver(struct cpufreq_driver *driver_data)
		145	{
		146	unsigned long flags;
		147
		148	if (!driver_data \|\| !driver_data->verify \|\| !driver_data->init \|\|
		149	((!driver_data->setpolicy) && (!driver_data->target)))
		150	return -EINVAL;
		151
		152	spin_lock_irqsave(&cpufreq_driver_lock, flags);
		153	if (cpufreq_driver) {
		154	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		155	return -EBUSY;
		156	}
		157	cpufreq_driver = driver_data;
		158	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		159
		160	/* Init & verify - TODO */
		161	cpufreq_driver->init(cpufreq_cpu_data);
		162	cpufreq_driver->verify(cpufreq_cpu_data);
		163
		164	return 0; //sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
		165	}
		166
		167	/**
		168	* cpufreq_unregister_driver - unregister the current CPUFreq driver
		169	*
		170	* Unregister the current CPUFreq driver. Only call this if you have
		171	* the right to do so, i.e. if you have succeeded in initialising before!
		172	* Returns zero if successful, and -EINVAL if the cpufreq_driver is
		173	* currently not initialised.
		174	*/
		175	int cpufreq_unregister_driver(struct cpufreq_driver *driver)
		176	{
		177	unsigned long flags;
		178
		179	if (!cpufreq_driver \|\| (driver != cpufreq_driver))
		180	return -EINVAL;
		181
		182	/* Exit */
		183	cpufreq_driver->exit(cpufreq_cpu_data);
		184
		185	//sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
		186
		187	spin_lock_irqsave(&cpufreq_driver_lock, flags);
		188	cpufreq_driver = NULL;
		189	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		190
		191	return 0;
		192	}

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(root)/shark/trunk/drivers/cpu/cpufreq/cpufreq.c @ 647 - Rev 775