66bfa2f031
This patch removes CVS keywords that weren't updated for a long time. Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
220 lines
5.1 KiB
C
220 lines
5.1 KiB
C
/*
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* linux/arch/arm/mach-integrator/cpu.c
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*
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* Copyright (C) 2001-2002 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* CPU support functions
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/cpufreq.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <mach/hardware.h>
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#include <asm/io.h>
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#include <asm/mach-types.h>
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#include <asm/hardware/icst525.h>
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static struct cpufreq_driver integrator_driver;
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#define CM_ID (IO_ADDRESS(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_ID_OFFSET)
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#define CM_OSC (IO_ADDRESS(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_OSC_OFFSET)
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#define CM_STAT (IO_ADDRESS(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_STAT_OFFSET)
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#define CM_LOCK (IO_ADDRESS(INTEGRATOR_HDR_BASE)+INTEGRATOR_HDR_LOCK_OFFSET)
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static const struct icst525_params lclk_params = {
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.ref = 24000,
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.vco_max = 320000,
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.vd_min = 8,
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.vd_max = 132,
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.rd_min = 24,
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.rd_max = 24,
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};
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static const struct icst525_params cclk_params = {
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.ref = 24000,
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.vco_max = 320000,
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.vd_min = 12,
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.vd_max = 160,
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.rd_min = 24,
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.rd_max = 24,
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};
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/*
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* Validate the speed policy.
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*/
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static int integrator_verify_policy(struct cpufreq_policy *policy)
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{
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struct icst525_vco vco;
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cpufreq_verify_within_limits(policy,
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policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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vco = icst525_khz_to_vco(&cclk_params, policy->max);
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policy->max = icst525_khz(&cclk_params, vco);
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vco = icst525_khz_to_vco(&cclk_params, policy->min);
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policy->min = icst525_khz(&cclk_params, vco);
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cpufreq_verify_within_limits(policy,
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policy->cpuinfo.min_freq,
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policy->cpuinfo.max_freq);
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return 0;
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}
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static int integrator_set_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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cpumask_t cpus_allowed;
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int cpu = policy->cpu;
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struct icst525_vco vco;
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struct cpufreq_freqs freqs;
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u_int cm_osc;
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/*
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* Save this threads cpus_allowed mask.
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*/
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cpus_allowed = current->cpus_allowed;
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/*
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* Bind to the specified CPU. When this call returns,
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* we should be running on the right CPU.
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*/
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set_cpus_allowed(current, cpumask_of_cpu(cpu));
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BUG_ON(cpu != smp_processor_id());
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/* get current setting */
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cm_osc = __raw_readl(CM_OSC);
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if (machine_is_integrator()) {
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vco.s = (cm_osc >> 8) & 7;
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} else if (machine_is_cintegrator()) {
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vco.s = 1;
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}
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vco.v = cm_osc & 255;
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vco.r = 22;
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freqs.old = icst525_khz(&cclk_params, vco);
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/* icst525_khz_to_vco rounds down -- so we need the next
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* larger freq in case of CPUFREQ_RELATION_L.
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*/
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if (relation == CPUFREQ_RELATION_L)
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target_freq += 999;
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if (target_freq > policy->max)
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target_freq = policy->max;
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vco = icst525_khz_to_vco(&cclk_params, target_freq);
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freqs.new = icst525_khz(&cclk_params, vco);
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freqs.cpu = policy->cpu;
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if (freqs.old == freqs.new) {
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set_cpus_allowed(current, cpus_allowed);
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return 0;
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}
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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cm_osc = __raw_readl(CM_OSC);
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if (machine_is_integrator()) {
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cm_osc &= 0xfffff800;
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cm_osc |= vco.s << 8;
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} else if (machine_is_cintegrator()) {
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cm_osc &= 0xffffff00;
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}
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cm_osc |= vco.v;
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__raw_writel(0xa05f, CM_LOCK);
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__raw_writel(cm_osc, CM_OSC);
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__raw_writel(0, CM_LOCK);
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/*
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* Restore the CPUs allowed mask.
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*/
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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 unsigned int integrator_get(unsigned int cpu)
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{
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cpumask_t cpus_allowed;
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unsigned int current_freq;
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u_int cm_osc;
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struct icst525_vco vco;
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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(cpu != smp_processor_id());
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/* detect memory etc. */
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cm_osc = __raw_readl(CM_OSC);
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if (machine_is_integrator()) {
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vco.s = (cm_osc >> 8) & 7;
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} else if (machine_is_cintegrator()) {
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vco.s = 1;
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}
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vco.v = cm_osc & 255;
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vco.r = 22;
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current_freq = icst525_khz(&cclk_params, vco); /* current freq */
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set_cpus_allowed(current, cpus_allowed);
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return current_freq;
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}
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static int integrator_cpufreq_init(struct cpufreq_policy *policy)
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{
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/* set default policy and cpuinfo */
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policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
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policy->cpuinfo.max_freq = 160000;
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policy->cpuinfo.min_freq = 12000;
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policy->cpuinfo.transition_latency = 1000000; /* 1 ms, assumed */
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policy->cur = policy->min = policy->max = integrator_get(policy->cpu);
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return 0;
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}
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static struct cpufreq_driver integrator_driver = {
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.verify = integrator_verify_policy,
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.target = integrator_set_target,
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.get = integrator_get,
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.init = integrator_cpufreq_init,
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.name = "integrator",
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};
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static int __init integrator_cpu_init(void)
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{
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return cpufreq_register_driver(&integrator_driver);
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}
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static void __exit integrator_cpu_exit(void)
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{
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cpufreq_unregister_driver(&integrator_driver);
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}
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MODULE_AUTHOR ("Russell M. King");
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MODULE_DESCRIPTION ("cpufreq driver for ARM Integrator CPUs");
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MODULE_LICENSE ("GPL");
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module_init(integrator_cpu_init);
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module_exit(integrator_cpu_exit);
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