![Tim Schmielau](/assets/img/avatar_default.png)
I recently picked up my older work to remove unnecessary #includes of sched.h, starting from a patch by Dave Jones to not include sched.h from module.h. This reduces the number of indirect includes of sched.h by ~300. Another ~400 pointless direct includes can be removed after this disentangling (patch to follow later). However, quite a few indirect includes need to be fixed up for this. In order to feed the patches through -mm with as little disturbance as possible, I've split out the fixes I accumulated up to now (complete for i386 and x86_64, more archs to follow later) and post them before the real patch. This way this large part of the patch is kept simple with only adding #includes, and all hunks are independent of each other. So if any hunk rejects or gets in the way of other patches, just drop it. My scripts will pick it up again in the next round. Signed-off-by: Tim Schmielau <tim@physik3.uni-rostock.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
220 lines
6.1 KiB
C
220 lines
6.1 KiB
C
/*
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* arch/sh/kernel/cpufreq.c
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*
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* cpufreq driver for the SuperH processors.
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*
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* Copyright (C) 2002, 2003, 2004, 2005 Paul Mundt
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* Copyright (C) 2002 M. R. Brown
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/cpufreq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/cpumask.h>
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#include <linux/smp.h>
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#include <linux/sched.h> /* set_cpus_allowed() */
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#include <asm/processor.h>
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#include <asm/watchdog.h>
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#include <asm/freq.h>
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#include <asm/io.h>
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/*
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* For SuperH, each policy change requires that we change the IFC, BFC, and
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* PFC at the same time. Here we define sane values that won't trash the
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* system.
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*
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* Note the max set is computed at runtime, we use the divisors that we booted
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* with to setup our maximum operating frequencies.
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*/
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struct clock_set {
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unsigned int ifc;
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unsigned int bfc;
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unsigned int pfc;
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} clock_sets[] = {
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#if defined(CONFIG_CPU_SH3) || defined(CONFIG_CPU_SH2)
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{ 0, 0, 0 }, /* not implemented yet */
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#elif defined(CONFIG_CPU_SH4)
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{ 4, 8, 8 }, /* min - IFC: 1/4, BFC: 1/8, PFC: 1/8 */
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{ 1, 2, 2 }, /* max - IFC: 1, BFC: 1/2, PFC: 1/2 */
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#endif
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};
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#define MIN_CLOCK_SET 0
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#define MAX_CLOCK_SET (ARRAY_SIZE(clock_sets) - 1)
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/*
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* For the time being, we only support two frequencies, which in turn are
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* aimed at the POWERSAVE and PERFORMANCE policies, which in turn are derived
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* directly from the respective min/max clock sets. Technically we could
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* support a wider range of frequencies, but these vary far too much for each
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* CPU subtype (and we'd have to construct a frequency table for each subtype).
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*
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* Maybe something to implement in the future..
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*/
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#define SH_FREQ_MAX 0
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#define SH_FREQ_MIN 1
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static struct cpufreq_frequency_table sh_freqs[] = {
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{ SH_FREQ_MAX, 0 },
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{ SH_FREQ_MIN, 0 },
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{ 0, CPUFREQ_TABLE_END },
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};
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static void sh_cpufreq_update_clocks(unsigned int set)
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{
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current_cpu_data.cpu_clock = current_cpu_data.master_clock / clock_sets[set].ifc;
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current_cpu_data.bus_clock = current_cpu_data.master_clock / clock_sets[set].bfc;
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current_cpu_data.module_clock = current_cpu_data.master_clock / clock_sets[set].pfc;
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current_cpu_data.loops_per_jiffy = loops_per_jiffy;
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}
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/* XXX: This needs to be split out per CPU and CPU subtype. */
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/*
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* Here we notify other drivers of the proposed change and the final change.
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*/
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static int sh_cpufreq_setstate(unsigned int cpu, unsigned int set)
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{
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unsigned short frqcr = ctrl_inw(FRQCR);
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cpumask_t cpus_allowed;
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struct cpufreq_freqs freqs;
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if (!cpu_online(cpu))
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return -ENODEV;
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cpus_allowed = current->cpus_allowed;
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set_cpus_allowed(current, cpumask_of_cpu(cpu));
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BUG_ON(smp_processor_id() != cpu);
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freqs.cpu = cpu;
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freqs.old = current_cpu_data.cpu_clock / 1000;
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freqs.new = (current_cpu_data.master_clock / clock_sets[set].ifc) / 1000;
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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#if defined(CONFIG_CPU_SH3)
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frqcr |= (newstate & 0x4000) << 14;
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frqcr |= (newstate & 0x000c) << 2;
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#elif defined(CONFIG_CPU_SH4)
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/*
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* FRQCR.PLL2EN is 1, we need to allow the PLL to stabilize by
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* initializing the WDT.
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*/
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if (frqcr & (1 << 9)) {
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__u8 csr;
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/*
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* Set the overflow period to the highest available,
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* in this case a 1/4096 division ratio yields a 5.25ms
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* overflow period. See asm-sh/watchdog.h for more
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* information and a range of other divisors.
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*/
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csr = sh_wdt_read_csr();
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csr |= WTCSR_CKS_4096;
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sh_wdt_write_csr(csr);
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sh_wdt_write_cnt(0);
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}
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frqcr &= 0x0e00; /* Clear ifc, bfc, pfc */
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frqcr |= get_ifc_value(clock_sets[set].ifc) << 6;
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frqcr |= get_bfc_value(clock_sets[set].bfc) << 3;
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frqcr |= get_pfc_value(clock_sets[set].pfc);
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#endif
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ctrl_outw(frqcr, FRQCR);
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sh_cpufreq_update_clocks(set);
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set_cpus_allowed(current, cpus_allowed);
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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return 0;
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}
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static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
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{
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unsigned int min_freq, max_freq;
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unsigned int ifc, bfc, pfc;
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if (!cpu_online(policy->cpu))
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return -ENODEV;
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/* Update our maximum clock set */
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get_current_frequency_divisors(&ifc, &bfc, &pfc);
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clock_sets[MAX_CLOCK_SET].ifc = ifc;
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clock_sets[MAX_CLOCK_SET].bfc = bfc;
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clock_sets[MAX_CLOCK_SET].pfc = pfc;
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/* Convert from Hz to kHz */
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max_freq = current_cpu_data.cpu_clock / 1000;
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min_freq = (current_cpu_data.master_clock / clock_sets[MIN_CLOCK_SET].ifc) / 1000;
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sh_freqs[SH_FREQ_MAX].frequency = max_freq;
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sh_freqs[SH_FREQ_MIN].frequency = min_freq;
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/* cpuinfo and default policy values */
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policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
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policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
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policy->cur = max_freq;
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return cpufreq_frequency_table_cpuinfo(policy, &sh_freqs[0]);
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}
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static int sh_cpufreq_verify(struct cpufreq_policy *policy)
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{
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return cpufreq_frequency_table_verify(policy, &sh_freqs[0]);
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}
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static int sh_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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unsigned int set, idx = 0;
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if (cpufreq_frequency_table_target(policy, &sh_freqs[0], target_freq, relation, &idx))
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return -EINVAL;
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set = (idx == SH_FREQ_MIN) ? MIN_CLOCK_SET : MAX_CLOCK_SET;
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sh_cpufreq_setstate(policy->cpu, set);
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return 0;
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}
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static struct cpufreq_driver sh_cpufreq_driver = {
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.owner = THIS_MODULE,
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.name = "SH cpufreq",
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.init = sh_cpufreq_cpu_init,
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.verify = sh_cpufreq_verify,
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.target = sh_cpufreq_target,
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};
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static int __init sh_cpufreq_init(void)
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{
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if (!current_cpu_data.cpu_clock)
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return -EINVAL;
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if (cpufreq_register_driver(&sh_cpufreq_driver))
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return -EINVAL;
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return 0;
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}
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static void __exit sh_cpufreq_exit(void)
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{
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cpufreq_unregister_driver(&sh_cpufreq_driver);
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}
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module_init(sh_cpufreq_init);
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module_exit(sh_cpufreq_exit);
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MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
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MODULE_DESCRIPTION("cpufreq driver for SuperH");
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MODULE_LICENSE("GPL");
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