diff options
Diffstat (limited to 'drivers/cpufreq/db8500-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/db8500-cpufreq.c | 173 |
1 files changed, 0 insertions, 173 deletions
diff --git a/drivers/cpufreq/db8500-cpufreq.c b/drivers/cpufreq/db8500-cpufreq.c deleted file mode 100644 index f5002015d82..00000000000 --- a/drivers/cpufreq/db8500-cpufreq.c +++ /dev/null @@ -1,173 +0,0 @@ -/* - * Copyright (C) STMicroelectronics 2009 - * Copyright (C) ST-Ericsson SA 2010 - * - * License Terms: GNU General Public License v2 - * Author: Sundar Iyer <sundar.iyer@stericsson.com> - * Author: Martin Persson <martin.persson@stericsson.com> - * Author: Jonas Aaberg <jonas.aberg@stericsson.com> - * - */ -#include <linux/kernel.h> -#include <linux/cpufreq.h> -#include <linux/delay.h> -#include <linux/slab.h> -#include <linux/mfd/dbx500-prcmu.h> -#include <mach/id.h> - -static struct cpufreq_frequency_table freq_table[] = { - [0] = { - .index = 0, - .frequency = 200000, - }, - [1] = { - .index = 1, - .frequency = 300000, - }, - [2] = { - .index = 2, - .frequency = 600000, - }, - [3] = { - /* Used for MAX_OPP, if available */ - .index = 3, - .frequency = CPUFREQ_TABLE_END, - }, - [4] = { - .index = 4, - .frequency = CPUFREQ_TABLE_END, - }, -}; - -static enum arm_opp idx2opp[] = { - ARM_EXTCLK, - ARM_50_OPP, - ARM_100_OPP, - ARM_MAX_OPP -}; - -static struct freq_attr *db8500_cpufreq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; - -static int db8500_cpufreq_verify_speed(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, freq_table); -} - -static int db8500_cpufreq_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_freqs freqs; - unsigned int idx; - - /* scale the target frequency to one of the extremes supported */ - 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; - - /* Lookup the next frequency */ - if (cpufreq_frequency_table_target - (policy, freq_table, target_freq, relation, &idx)) { - return -EINVAL; - } - - freqs.old = policy->cur; - freqs.new = freq_table[idx].frequency; - - if (freqs.old == freqs.new) - return 0; - - /* pre-change notification */ - for_each_cpu(freqs.cpu, policy->cpus) - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - - /* request the PRCM unit for opp change */ - if (prcmu_set_arm_opp(idx2opp[idx])) { - pr_err("db8500-cpufreq: Failed to set OPP level\n"); - return -EINVAL; - } - - /* post change notification */ - for_each_cpu(freqs.cpu, policy->cpus) - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - return 0; -} - -static unsigned int db8500_cpufreq_getspeed(unsigned int cpu) -{ - int i; - /* request the prcm to get the current ARM opp */ - for (i = 0; prcmu_get_arm_opp() != idx2opp[i]; i++) - ; - return freq_table[i].frequency; -} - -static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy) -{ - int i, res; - - BUILD_BUG_ON(ARRAY_SIZE(idx2opp) + 1 != ARRAY_SIZE(freq_table)); - - if (!prcmu_is_u8400()) { - freq_table[1].frequency = 400000; - freq_table[2].frequency = 800000; - if (prcmu_has_arm_maxopp()) - freq_table[3].frequency = 1000000; - } - pr_info("db8500-cpufreq : Available frequencies:\n"); - for (i = 0; freq_table[i].frequency != CPUFREQ_TABLE_END; i++) - pr_info(" %d Mhz\n", freq_table[i].frequency/1000); - - /* get policy fields based on the table */ - res = cpufreq_frequency_table_cpuinfo(policy, freq_table); - if (!res) - cpufreq_frequency_table_get_attr(freq_table, policy->cpu); - else { - pr_err("db8500-cpufreq : Failed to read policy table\n"); - return res; - } - - policy->min = policy->cpuinfo.min_freq; - policy->max = policy->cpuinfo.max_freq; - policy->cur = db8500_cpufreq_getspeed(policy->cpu); - policy->governor = CPUFREQ_DEFAULT_GOVERNOR; - - /* - * FIXME : Need to take time measurement across the target() - * function with no/some/all drivers in the notification - * list. - */ - policy->cpuinfo.transition_latency = 20 * 1000; /* in ns */ - - /* policy sharing between dual CPUs */ - cpumask_copy(policy->cpus, &cpu_present_map); - - policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; - - return 0; -} - -static struct cpufreq_driver db8500_cpufreq_driver = { - .flags = CPUFREQ_STICKY, - .verify = db8500_cpufreq_verify_speed, - .target = db8500_cpufreq_target, - .get = db8500_cpufreq_getspeed, - .init = db8500_cpufreq_init, - .name = "DB8500", - .attr = db8500_cpufreq_attr, -}; - -static int __init db8500_cpufreq_register(void) -{ - if (!cpu_is_u8500v20_or_later()) - return -ENODEV; - - pr_info("cpufreq for DB8500 started\n"); - return cpufreq_register_driver(&db8500_cpufreq_driver); -} -device_initcall(db8500_cpufreq_register); |