litmus-rt.git - The LITMUS^RT kernel.

	Commit message (Expand)	Author	Age
*	work_on_cpu: Use our own workqueue.	Rusty Russell	2009-01-19
*	work_on_cpu: don't try to get_online_cpus() in work_on_cpu.	Rusty Russell	2009-01-19
*	cpumask: convert kernel/workqueue.c	Rusty Russell	2008-12-31
*	Merge branch 'master' into next	James Morris	2008-11-13
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\| *	cpumask: introduce new API, without changing anything	Rusty Russell	2008-11-06
* \|	CRED: Rename is_single_threaded() to is_wq_single_threaded()	David Howells	2008-11-13
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*	workqueue: introduce create_rt_workqueue	Heiko Carstens	2008-10-21
*	Remove Andrew Morton's old email accounts	Francois Cami	2008-10-16
*	Merge branch 'core/locking' into core/urgent	Ingo Molnar	2008-08-11
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\| *	lockdep: rename map_[acquire\|release]() => lock_map_[acquire\|release]()	Ingo Molnar	2008-08-11
\| *	lockdep: map_acquire	Peter Zijlstra	2008-08-11
* \|	workqueues: add comments to __create_workqueue_key()	Oleg Nesterov	2008-07-30
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*	workqueues: do CPU_UP_CANCELED if CPU_UP_PREPARE fails	Oleg Nesterov	2008-07-25
*	workqueues: schedule_on_each_cpu() can use schedule_work_on()	Oleg Nesterov	2008-07-25
*	workqueues: queue_work() can use queue_work_on()	Oleg Nesterov	2008-07-25
*	workqueues: lockdep annotations for flush_work()	Oleg Nesterov	2008-07-25
*	workqueues: make get_online_cpus() useable for work->func()	Oleg Nesterov	2008-07-25
*	workqueues: schedule_on_each_cpu: use flush_work()	Oleg Nesterov	2008-07-25
*	workqueues: implement flush_work()	Oleg Nesterov	2008-07-25
*	workqueues: insert_work: use "list_head *" instead of "int tail"	Oleg Nesterov	2008-07-25
*	pm: introduce new interfaces schedule_work_on() and queue_work_on()	Zhang Rui	2008-07-24
*	Merge commit 'v2.6.26-rc9' into cpus4096	Ingo Molnar	2008-07-06
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\| *	Christoph has moved	Christoph Lameter	2008-07-04
* \|	core: use performance variant for_each_cpu_mask_nr	Mike Travis	2008-05-23
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*	workqueue: remove redundant function invocation	Andrew Liu	2008-05-01
*	kernel: replace remaining __FUNCTION__ occurrences	Harvey Harrison	2008-04-30
*	cleanup_workqueue_thread: remove the unneeded "cpu" parameter	Oleg Nesterov	2008-04-29
*	workqueues: shrink cpu_populated_map when CPU dies	Oleg Nesterov	2008-04-29
*	timer_list: add annotations to workqueue.c	Pavel Machek	2008-04-17
*	workqueue: make delayed_work_timer_fn() static	Li Zefan	2008-02-08
*	kernel: remove fastcall in kernel/*	Harvey Harrison	2008-02-08
*	cpu-hotplug: replace per-subsystem mutexes with get_online_cpus()	Gautham R Shenoy	2008-01-25
*	lockdep: fix workqueue creation API lockdep interaction	Johannes Berg	2008-01-16
*	Use helpers to obtain task pid in printks	Pavel Emelyanov	2007-10-19
*	workqueue: debug flushing deadlocks with lockdep	Johannes Berg	2007-10-19
*	fix bogus hotplug cpu warning	Hugh Dickins	2007-08-27
*	destroy_workqueue() can livelock	Oleg Nesterov	2007-07-17
*	Freezer: make kernel threads nonfreezable by default	Rafael J. Wysocki	2007-07-17
*	make cancel_xxx_work_sync() return a boolean	Oleg Nesterov	2007-07-16
*	rename cancel_rearming_delayed_work() to cancel_delayed_work_sync()	Oleg Nesterov	2007-07-16
*	simplify cleanup_workqueue_thread()	Oleg Nesterov	2007-05-23
*	Add suspend-related notifications for CPU hotplug	Rafael J. Wysocki	2007-05-09
*	make cancel_rearming_delayed_work() reliable	Oleg Nesterov	2007-05-09
*	worker_thread: don't play with SIGCHLD and numa policy	Oleg Nesterov	2007-05-09
*	unify flush_work/flush_work_keventd and rename it to cancel_work_sync	Oleg Nesterov	2007-05-09
*	worker_thread: fix racy try_to_freeze() usage	Oleg Nesterov	2007-05-09
*	worker_thread: don't play with signals	Oleg Nesterov	2007-05-09
*	workqueue: kill NOAUTOREL works	Oleg Nesterov	2007-05-09
*	make cancel_rearming_delayed_work() work on any workqueue, not just keventd_wq	Oleg Nesterov	2007-05-09
*	workqueue: introduce wq_per_cpu() helper	Oleg Nesterov	2007-05-09

/* * CPU frequency scaling for DaVinci * * Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/ * * Based on linux/arch/arm/plat-omap/cpu-omap.c. Original Copyright follows: * * Copyright (C) 2005 Nokia Corporation * Written by Tony Lindgren <tony@atomide.com> * * Based on cpu-sa1110.c, Copyright (C) 2001 Russell King * * Copyright (C) 2007-2008 Texas Instruments, Inc. * Updated to support OMAP3 * Rajendra Nayak <rnayak@ti.com> * * 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/types.h> #include <linux/cpufreq.h> #include <linux/init.h> #include <linux/err.h> #include <linux/clk.h> #include <linux/platform_device.h> #include <mach/hardware.h> #include <mach/cpufreq.h> #include <mach/common.h> #include "clock.h" struct davinci_cpufreq { struct device *dev; struct clk *armclk; struct clk *asyncclk; unsigned long asyncrate; }; static struct davinci_cpufreq cpufreq; static int davinci_verify_speed(struct cpufreq_policy *policy) { struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data; struct cpufreq_frequency_table *freq_table = pdata->freq_table; struct clk *armclk = cpufreq.armclk; if (freq_table) return cpufreq_frequency_table_verify(policy, freq_table); if (policy->cpu) return -EINVAL; cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq); policy->min = clk_round_rate(armclk, policy->min * 1000) / 1000; policy->max = clk_round_rate(armclk, policy->max * 1000) / 1000; cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, policy->cpuinfo.max_freq); return 0; } static unsigned int davinci_getspeed(unsigned int cpu) { if (cpu) return 0; return clk_get_rate(cpufreq.armclk) / 1000; } static int davinci_target(struct cpufreq_policy *policy, unsigned int target_freq, unsigned int relation) { int ret = 0; unsigned int idx; struct cpufreq_freqs freqs; struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data; struct clk *armclk = cpufreq.armclk; /* * Ensure desired rate is within allowed range. Some govenors * (ondemand) will just pass target_freq=0 to get the minimum. */ if (target_freq < policy->cpuinfo.min_freq) target_freq = policy->cpuinfo.min_freq; if (target_freq > policy->cpuinfo.max_freq) target_freq = policy->cpuinfo.max_freq; freqs.old = davinci_getspeed(0); freqs.new = clk_round_rate(armclk, target_freq * 1000) / 1000; freqs.cpu = 0; if (freqs.old == freqs.new) return ret; dev_dbg(&cpufreq.dev, "transition: %u --> %u\n", freqs.old, freqs.new); ret = cpufreq_frequency_table_target(policy, pdata->freq_table, freqs.new, relation, &idx); if (ret) return -EINVAL; cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); /* if moving to higher frequency, up the voltage beforehand */ if (pdata->set_voltage && freqs.new > freqs.old) { ret = pdata->set_voltage(idx); if (ret) goto out; } ret = clk_set_rate(armclk, idx); if (ret) goto out; if (cpufreq.asyncclk) { ret = clk_set_rate(cpufreq.asyncclk, cpufreq.asyncrate); if (ret) goto out; } /* if moving to lower freq, lower the voltage after lowering freq */ if (pdata->set_voltage && freqs.new < freqs.old) pdata->set_voltage(idx); out: cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); return ret; } static int davinci_cpu_init(struct cpufreq_policy *policy) { int result = 0; struct davinci_cpufreq_config *pdata = cpufreq.dev->platform_data; struct cpufreq_frequency_table *freq_table = pdata->freq_table; if (policy->cpu != 0) return -EINVAL; /* Finish platform specific initialization */ if (pdata->init) { result = pdata->init(); if (result) return result; } policy->cur = policy->min = policy->max = davinci_getspeed(0); if (freq_table) { result = cpufreq_frequency_table_cpuinfo(policy, freq_table); if (!result) cpufreq_frequency_table_get_attr(freq_table, policy->cpu); } else { policy->cpuinfo.min_freq = policy->min; policy->cpuinfo.max_freq = policy->max; } policy->min = policy->cpuinfo.min_freq; policy->max = policy->cpuinfo.max_freq; policy->cur = davinci_getspeed(0); /* * Time measurement across the target() function yields ~1500-1800us * time taken with no drivers on notification list. * Setting the latency to 2000 us to accommodate addition of drivers * to pre/post change notification list. */ policy->cpuinfo.transition_latency = 2000 * 1000; return 0; } static int davinci_cpu_exit(struct cpufreq_policy *policy) { cpufreq_frequency_table_put_attr(policy->cpu); return 0; } static struct freq_attr *davinci_cpufreq_attr[] = { &cpufreq_freq_attr_scaling_available_freqs, NULL, }; static struct cpufreq_driver davinci_driver = { .flags = CPUFREQ_STICKY, .verify = davinci_verify_speed, .target = davinci_target, .get = davinci_getspeed, .init = davinci_cpu_init, .exit = davinci_cpu_exit, .name = "davinci", .attr = davinci_cpufreq_attr, }; static int __init davinci_cpufreq_probe(struct platform_device *pdev) { struct davinci_cpufreq_config *pdata = pdev->dev.platform_data; struct clk *asyncclk; if (!pdata) return -EINVAL; if (!pdata->freq_table) return -EINVAL; cpufreq.dev = &pdev->dev; cpufreq.armclk = clk_get(NULL, "arm"); if (IS_ERR(cpufreq.armclk)) { dev_err(cpufreq.dev, "Unable to get ARM clock\n"); return PTR_ERR(cpufreq.armclk); } asyncclk = clk_get(cpufreq.dev, "async"); if (!IS_ERR(asyncclk)) { cpufreq.asyncclk = asyncclk; cpufreq.asyncrate = clk_get_rate(asyncclk); } return cpufreq_register_driver(&davinci_driver); } static int __exit davinci_cpufreq_remove(struct platform_device *pdev) { clk_put(cpufreq.armclk); if (cpufreq.asyncclk) clk_put(cpufreq.asyncclk); return cpufreq_unregister_driver(&davinci_driver); } static struct platform_driver davinci_cpufreq_driver = { .driver = { .name = "cpufreq-davinci", .owner = THIS_MODULE, }, .remove = __exit_p(davinci_cpufreq_remove), }; static int __init davinci_cpufreq_init(void) { return platform_driver_probe(&davinci_cpufreq_driver, davinci_cpufreq_probe); } late_initcall(davinci_cpufreq_init);