diff options
Diffstat (limited to 'arch/ia64/kernel/cpufreq/acpi-cpufreq.c')
| -rw-r--r-- | arch/ia64/kernel/cpufreq/acpi-cpufreq.c | 439 |
1 files changed, 0 insertions, 439 deletions
diff --git a/arch/ia64/kernel/cpufreq/acpi-cpufreq.c b/arch/ia64/kernel/cpufreq/acpi-cpufreq.c deleted file mode 100644 index 4700fef8d1fa..000000000000 --- a/arch/ia64/kernel/cpufreq/acpi-cpufreq.c +++ /dev/null @@ -1,439 +0,0 @@ -/* - * arch/ia64/kernel/cpufreq/acpi-cpufreq.c - * This file provides the ACPI based P-state support. This - * module works with generic cpufreq infrastructure. Most of - * the code is based on i386 version - * (arch/i386/kernel/cpu/cpufreq/acpi-cpufreq.c) - * - * Copyright (C) 2005 Intel Corp - * Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> - */ - -#include <linux/kernel.h> -#include <linux/slab.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/cpufreq.h> -#include <linux/proc_fs.h> -#include <linux/seq_file.h> -#include <asm/io.h> -#include <asm/uaccess.h> -#include <asm/pal.h> - -#include <linux/acpi.h> -#include <acpi/processor.h> - -MODULE_AUTHOR("Venkatesh Pallipadi"); -MODULE_DESCRIPTION("ACPI Processor P-States Driver"); -MODULE_LICENSE("GPL"); - - -struct cpufreq_acpi_io { - struct acpi_processor_performance acpi_data; - struct cpufreq_frequency_table *freq_table; - unsigned int resume; -}; - -static struct cpufreq_acpi_io *acpi_io_data[NR_CPUS]; - -static struct cpufreq_driver acpi_cpufreq_driver; - - -static int -processor_set_pstate ( - u32 value) -{ - s64 retval; - - pr_debug("processor_set_pstate\n"); - - retval = ia64_pal_set_pstate((u64)value); - - if (retval) { - pr_debug("Failed to set freq to 0x%x, with error 0x%lx\n", - value, retval); - return -ENODEV; - } - return (int)retval; -} - - -static int -processor_get_pstate ( - u32 *value) -{ - u64 pstate_index = 0; - s64 retval; - - pr_debug("processor_get_pstate\n"); - - retval = ia64_pal_get_pstate(&pstate_index, - PAL_GET_PSTATE_TYPE_INSTANT); - *value = (u32) pstate_index; - - if (retval) - pr_debug("Failed to get current freq with " - "error 0x%lx, idx 0x%x\n", retval, *value); - - return (int)retval; -} - - -/* To be used only after data->acpi_data is initialized */ -static unsigned -extract_clock ( - struct cpufreq_acpi_io *data, - unsigned value, - unsigned int cpu) -{ - unsigned long i; - - pr_debug("extract_clock\n"); - - for (i = 0; i < data->acpi_data.state_count; i++) { - if (value == data->acpi_data.states[i].status) - return data->acpi_data.states[i].core_frequency; - } - return data->acpi_data.states[i-1].core_frequency; -} - - -static unsigned int -processor_get_freq ( - struct cpufreq_acpi_io *data, - unsigned int cpu) -{ - int ret = 0; - u32 value = 0; - cpumask_t saved_mask; - unsigned long clock_freq; - - pr_debug("processor_get_freq\n"); - - saved_mask = current->cpus_allowed; - set_cpus_allowed_ptr(current, cpumask_of(cpu)); - if (smp_processor_id() != cpu) - goto migrate_end; - - /* processor_get_pstate gets the instantaneous frequency */ - ret = processor_get_pstate(&value); - - if (ret) { - set_cpus_allowed_ptr(current, &saved_mask); - printk(KERN_WARNING "get performance failed with error %d\n", - ret); - ret = 0; - goto migrate_end; - } - clock_freq = extract_clock(data, value, cpu); - ret = (clock_freq*1000); - -migrate_end: - set_cpus_allowed_ptr(current, &saved_mask); - return ret; -} - - -static int -processor_set_freq ( - struct cpufreq_acpi_io *data, - struct cpufreq_policy *policy, - int state) -{ - int ret = 0; - u32 value = 0; - struct cpufreq_freqs cpufreq_freqs; - cpumask_t saved_mask; - int retval; - - pr_debug("processor_set_freq\n"); - - saved_mask = current->cpus_allowed; - set_cpus_allowed_ptr(current, cpumask_of(policy->cpu)); - if (smp_processor_id() != policy->cpu) { - retval = -EAGAIN; - goto migrate_end; - } - - if (state == data->acpi_data.state) { - if (unlikely(data->resume)) { - pr_debug("Called after resume, resetting to P%d\n", state); - data->resume = 0; - } else { - pr_debug("Already at target state (P%d)\n", state); - retval = 0; - goto migrate_end; - } - } - - pr_debug("Transitioning from P%d to P%d\n", - data->acpi_data.state, state); - - /* cpufreq frequency struct */ - cpufreq_freqs.old = data->freq_table[data->acpi_data.state].frequency; - cpufreq_freqs.new = data->freq_table[state].frequency; - - /* notify cpufreq */ - cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_PRECHANGE); - - /* - * First we write the target state's 'control' value to the - * control_register. - */ - - value = (u32) data->acpi_data.states[state].control; - - pr_debug("Transitioning to state: 0x%08x\n", value); - - ret = processor_set_pstate(value); - if (ret) { - unsigned int tmp = cpufreq_freqs.new; - cpufreq_notify_transition(policy, &cpufreq_freqs, - CPUFREQ_POSTCHANGE); - cpufreq_freqs.new = cpufreq_freqs.old; - cpufreq_freqs.old = tmp; - cpufreq_notify_transition(policy, &cpufreq_freqs, - CPUFREQ_PRECHANGE); - cpufreq_notify_transition(policy, &cpufreq_freqs, - CPUFREQ_POSTCHANGE); - printk(KERN_WARNING "Transition failed with error %d\n", ret); - retval = -ENODEV; - goto migrate_end; - } - - cpufreq_notify_transition(policy, &cpufreq_freqs, CPUFREQ_POSTCHANGE); - - data->acpi_data.state = state; - - retval = 0; - -migrate_end: - set_cpus_allowed_ptr(current, &saved_mask); - return (retval); -} - - -static unsigned int -acpi_cpufreq_get ( - unsigned int cpu) -{ - struct cpufreq_acpi_io *data = acpi_io_data[cpu]; - - pr_debug("acpi_cpufreq_get\n"); - - return processor_get_freq(data, cpu); -} - - -static int -acpi_cpufreq_target ( - struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - unsigned int next_state = 0; - unsigned int result = 0; - - pr_debug("acpi_cpufreq_setpolicy\n"); - - result = cpufreq_frequency_table_target(policy, - data->freq_table, target_freq, relation, &next_state); - if (result) - return (result); - - result = processor_set_freq(data, policy, next_state); - - return (result); -} - - -static int -acpi_cpufreq_verify ( - struct cpufreq_policy *policy) -{ - unsigned int result = 0; - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - - pr_debug("acpi_cpufreq_verify\n"); - - result = cpufreq_frequency_table_verify(policy, - data->freq_table); - - return (result); -} - - -static int -acpi_cpufreq_cpu_init ( - struct cpufreq_policy *policy) -{ - unsigned int i; - unsigned int cpu = policy->cpu; - struct cpufreq_acpi_io *data; - unsigned int result = 0; - - pr_debug("acpi_cpufreq_cpu_init\n"); - - data = kzalloc(sizeof(struct cpufreq_acpi_io), GFP_KERNEL); - if (!data) - return (-ENOMEM); - - acpi_io_data[cpu] = data; - - result = acpi_processor_register_performance(&data->acpi_data, cpu); - - if (result) - goto err_free; - - /* capability check */ - if (data->acpi_data.state_count <= 1) { - pr_debug("No P-States\n"); - result = -ENODEV; - goto err_unreg; - } - - if ((data->acpi_data.control_register.space_id != - ACPI_ADR_SPACE_FIXED_HARDWARE) || - (data->acpi_data.status_register.space_id != - ACPI_ADR_SPACE_FIXED_HARDWARE)) { - pr_debug("Unsupported address space [%d, %d]\n", - (u32) (data->acpi_data.control_register.space_id), - (u32) (data->acpi_data.status_register.space_id)); - result = -ENODEV; - goto err_unreg; - } - - /* alloc freq_table */ - data->freq_table = kmalloc(sizeof(struct cpufreq_frequency_table) * - (data->acpi_data.state_count + 1), - GFP_KERNEL); - if (!data->freq_table) { - result = -ENOMEM; - goto err_unreg; - } - - /* detect transition latency */ - policy->cpuinfo.transition_latency = 0; - for (i=0; i<data->acpi_data.state_count; i++) { - if ((data->acpi_data.states[i].transition_latency * 1000) > - policy->cpuinfo.transition_latency) { - policy->cpuinfo.transition_latency = - data->acpi_data.states[i].transition_latency * 1000; - } - } - policy->cur = processor_get_freq(data, policy->cpu); - - /* table init */ - for (i = 0; i <= data->acpi_data.state_count; i++) - { - data->freq_table[i].index = i; - if (i < data->acpi_data.state_count) { - data->freq_table[i].frequency = - data->acpi_data.states[i].core_frequency * 1000; - } else { - data->freq_table[i].frequency = CPUFREQ_TABLE_END; - } - } - - result = cpufreq_frequency_table_cpuinfo(policy, data->freq_table); - if (result) { - goto err_freqfree; - } - - /* notify BIOS that we exist */ - acpi_processor_notify_smm(THIS_MODULE); - - printk(KERN_INFO "acpi-cpufreq: CPU%u - ACPI performance management " - "activated.\n", cpu); - - for (i = 0; i < data->acpi_data.state_count; i++) - pr_debug(" %cP%d: %d MHz, %d mW, %d uS, %d uS, 0x%x 0x%x\n", - (i == data->acpi_data.state?'*':' '), i, - (u32) data->acpi_data.states[i].core_frequency, - (u32) data->acpi_data.states[i].power, - (u32) data->acpi_data.states[i].transition_latency, - (u32) data->acpi_data.states[i].bus_master_latency, - (u32) data->acpi_data.states[i].status, - (u32) data->acpi_data.states[i].control); - - cpufreq_frequency_table_get_attr(data->freq_table, policy->cpu); - - /* the first call to ->target() should result in us actually - * writing something to the appropriate registers. */ - data->resume = 1; - - return (result); - - err_freqfree: - kfree(data->freq_table); - err_unreg: - acpi_processor_unregister_performance(&data->acpi_data, cpu); - err_free: - kfree(data); - acpi_io_data[cpu] = NULL; - - return (result); -} - - -static int -acpi_cpufreq_cpu_exit ( - struct cpufreq_policy *policy) -{ - struct cpufreq_acpi_io *data = acpi_io_data[policy->cpu]; - - pr_debug("acpi_cpufreq_cpu_exit\n"); - - if (data) { - cpufreq_frequency_table_put_attr(policy->cpu); - acpi_io_data[policy->cpu] = NULL; - acpi_processor_unregister_performance(&data->acpi_data, - policy->cpu); - kfree(data); - } - - return (0); -} - - -static struct freq_attr* acpi_cpufreq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; - - -static struct cpufreq_driver acpi_cpufreq_driver = { - .verify = acpi_cpufreq_verify, - .target = acpi_cpufreq_target, - .get = acpi_cpufreq_get, - .init = acpi_cpufreq_cpu_init, - .exit = acpi_cpufreq_cpu_exit, - .name = "acpi-cpufreq", - .owner = THIS_MODULE, - .attr = acpi_cpufreq_attr, -}; - - -static int __init -acpi_cpufreq_init (void) -{ - pr_debug("acpi_cpufreq_init\n"); - - return cpufreq_register_driver(&acpi_cpufreq_driver); -} - - -static void __exit -acpi_cpufreq_exit (void) -{ - pr_debug("acpi_cpufreq_exit\n"); - - cpufreq_unregister_driver(&acpi_cpufreq_driver); - return; -} - - -late_initcall(acpi_cpufreq_init); -module_exit(acpi_cpufreq_exit); - |