WebSVN - shark - Blame - Rev 768 - /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);
647	mauro	43
582	mauro	44	/**
		45	* The "cpufreq driver" - the arch- or hardware-dependend low
		46	* level driver of CPUFreq support, and its spinlock. This lock
		47	* also protects the cpufreq_cpu_data array.
		48	*/
597	mauro	49	static struct cpufreq_policy cpufreq_cpu_policy;
		50	static struct cpufreq_policy *cpufreq_cpu_data = &cpufreq_cpu_policy;
582	mauro	51	static struct cpufreq_driver *cpufreq_driver;
		52	static spinlock_t cpufreq_driver_lock = SPIN_LOCK_UNLOCKED;
		53
		54	/*********************************************************************
		55	* USER *
		56	*********************************************************************/
		57
		58	int cpufreq_target(unsigned int target_freq, unsigned int relation)
		59	{
		60	return cpufreq_driver_target(cpufreq_cpu_data, target_freq, relation);
		61	}
		62
597	mauro	63	int cpufreq_get_cur_freq(void)
		64	{
		65	return cpufreq_cpu_data->cur;
		66	}
		67
		68	int cpufreq_get_min_freq(void)
		69	{
		70	return cpufreq_cpu_data->min;
		71	}
		72
		73	int cpufreq_get_max_freq(void)
		74	{
		75	return cpufreq_cpu_data->max;
		76	}
		77
		78	int cpufreq_get_latency(void)
		79	{
		80	return cpufreq_cpu_data->cpuinfo.transition_latency;
		81	}
		82
582	mauro	83	/*********************************************************************
		84	* GOVERNOR *
		85	*********************************************************************/
		86
		87	int cpufreq_driver_target(struct cpufreq_policy *policy,
		88	unsigned int target_freq,
		89	unsigned int relation)
		90	{
		91	unsigned int ret;
		92
		93	if (!policy)
		94	return -EINVAL;
		95
		96	ret = cpufreq_driver->target(policy, target_freq, relation);
		97
		98	return ret;
		99	}
		100
		101	/*********************************************************************
597	mauro	102	* NOTIFIER *
		103	*********************************************************************/
		104	void cpufreq_notify_transition(struct cpufreq_freqs *freqs, unsigned int state)
		105	{
		106	switch (state) {
		107	case CPUFREQ_PRECHANGE:
		108	//adjust_jiffies(CPUFREQ_PRECHANGE, freqs);
		109	break;
		110	case CPUFREQ_POSTCHANGE:
		111	//adjust_jiffies(CPUFREQ_POSTCHANGE, freqs);
768	mauro	112	//kern_scale_timer(freqs->old, freqs->new);
		113	ll_scale_advtimer(freqs->old, freqs->new);
597	mauro	114	cpufreq_cpu_data->cur = freqs->new;
		115	break;
		116	}
		117	}
		118
		119	/*********************************************************************
582	mauro	120	* REGISTER / UNREGISTER CPUFREQ DRIVER *
		121	*********************************************************************/
		122
		123	/**
		124	* cpufreq_register_driver - register a CPU Frequency driver
		125	* @driver_data: A struct cpufreq_driver containing the values#
		126	* submitted by the CPU Frequency driver.
		127	*
		128	* Registers a CPU Frequency driver to this core code. This code
		129	* returns zero on success, -EBUSY when another driver got here first
		130	* (and isn't unregistered in the meantime).
		131	*
		132	*/
		133	int cpufreq_register_driver(struct cpufreq_driver *driver_data)
		134	{
		135	unsigned long flags;
		136
		137	if (!driver_data \|\| !driver_data->verify \|\| !driver_data->init \|\|
		138	((!driver_data->setpolicy) && (!driver_data->target)))
		139	return -EINVAL;
		140
		141	spin_lock_irqsave(&cpufreq_driver_lock, flags);
		142	if (cpufreq_driver) {
		143	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		144	return -EBUSY;
		145	}
		146	cpufreq_driver = driver_data;
		147	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		148
		149	/* Init & verify - TODO */
		150	cpufreq_driver->init(cpufreq_cpu_data);
		151	cpufreq_driver->verify(cpufreq_cpu_data);
		152
		153	return 0; //sysdev_driver_register(&cpu_sysdev_class,&cpufreq_sysdev_driver);
		154	}
		155
		156	/**
		157	* cpufreq_unregister_driver - unregister the current CPUFreq driver
		158	*
		159	* Unregister the current CPUFreq driver. Only call this if you have
		160	* the right to do so, i.e. if you have succeeded in initialising before!
		161	* Returns zero if successful, and -EINVAL if the cpufreq_driver is
		162	* currently not initialised.
		163	*/
		164	int cpufreq_unregister_driver(struct cpufreq_driver *driver)
		165	{
		166	unsigned long flags;
		167
		168	if (!cpufreq_driver \|\| (driver != cpufreq_driver))
		169	return -EINVAL;
		170
		171	/* Exit */
		172	cpufreq_driver->exit(cpufreq_cpu_data);
		173
		174	//sysdev_driver_unregister(&cpu_sysdev_class, &cpufreq_sysdev_driver);
		175
		176	spin_lock_irqsave(&cpufreq_driver_lock, flags);
		177	cpufreq_driver = NULL;
		178	spin_unlock_irqrestore(&cpufreq_driver_lock, flags);
		179
		180	return 0;
		181	}

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(root)/shark/trunk/drivers/cpu/cpufreq/cpufreq.c @ 623 - Rev 768