diff options
Diffstat (limited to 'arch/arm/mach-ux500/cpufreq.c')
| -rw-r--r-- | arch/arm/mach-ux500/cpufreq.c | 211 |
1 files changed, 0 insertions, 211 deletions
diff --git a/arch/arm/mach-ux500/cpufreq.c b/arch/arm/mach-ux500/cpufreq.c deleted file mode 100644 index 5c5b747f134d..000000000000 --- a/arch/arm/mach-ux500/cpufreq.c +++ /dev/null @@ -1,211 +0,0 @@ -/* - * CPU frequency scaling for u8500 - * Inspired by linux/arch/arm/mach-davinci/cpufreq.c - * - * Copyright (C) STMicroelectronics 2009 - * Copyright (C) ST-Ericsson SA 2010 - * - * License Terms: GNU General Public License v2 - * - * Author: Sundar Iyer <[email protected]> - * Author: Martin Persson <[email protected]> - * Author: Jonas Aaberg <[email protected]> - * - */ - -#include <linux/platform_device.h> -#include <linux/kernel.h> -#include <linux/cpufreq.h> -#include <linux/delay.h> - -#include <mach/hardware.h> -#include <mach/prcmu.h> -#include <mach/prcmu-defs.h> - -#define DRIVER_NAME "cpufreq-u8500" -#define CPUFREQ_NAME "u8500" - -static struct device *dev; - -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 CPU_OPP_MAX, if available */ - .index = 3, - .frequency = CPUFREQ_TABLE_END, - }, - [4] = { - .index = 4, - .frequency = CPUFREQ_TABLE_END, - }, -}; - -static enum prcmu_cpu_opp index2opp[] = { - CPU_OPP_EXT_CLK, - CPU_OPP_50, - CPU_OPP_100, - CPU_OPP_MAX -}; - -static int u8500_cpufreq_verify_speed(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, freq_table); -} - -static int u8500_cpufreq_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_freqs freqs; - unsigned int index; - int ret = 0; - - /* - * 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; - - ret = cpufreq_frequency_table_target(policy, freq_table, - target_freq, relation, &index); - if (ret < 0) { - dev_err(dev, "Could not look up next frequency\n"); - return ret; - } - - freqs.old = policy->cur; - freqs.new = freq_table[index].frequency; - freqs.cpu = policy->cpu; - - if (freqs.old == freqs.new) { - dev_dbg(dev, "Current and target frequencies are equal\n"); - return 0; - } - - dev_dbg(dev, "transition: %u --> %u\n", freqs.old, freqs.new); - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - - ret = prcmu_set_cpu_opp(index2opp[index]); - if (ret < 0) { - dev_err(dev, "Failed to set OPP level\n"); - return ret; - } - - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - return ret; -} - -static unsigned int u8500_cpufreq_getspeed(unsigned int cpu) -{ - int i; - - for (i = 0; prcmu_get_cpu_opp() != index2opp[i]; i++) - ; - return freq_table[i].frequency; -} - -static int __cpuinit u8500_cpu_init(struct cpufreq_policy *policy) -{ - int res; - - BUILD_BUG_ON(ARRAY_SIZE(index2opp) + 1 != ARRAY_SIZE(freq_table)); - - if (cpu_is_u8500v2()) { - freq_table[1].frequency = 400000; - freq_table[2].frequency = 800000; - if (prcmu_has_arm_maxopp()) - freq_table[3].frequency = 1000000; - } - - /* 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 { - dev_err(dev, "u8500-cpufreq : Failed to read policy table\n"); - return res; - } - - policy->min = policy->cpuinfo.min_freq; - policy->max = policy->cpuinfo.max_freq; - policy->cur = u8500_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 = 200 * 1000; /* in ns */ - - /* policy sharing between dual CPUs */ - cpumask_copy(policy->cpus, &cpu_present_map); - - policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; - - return res; -} - -static struct freq_attr *u8500_cpufreq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; -static int u8500_cpu_exit(struct cpufreq_policy *policy) -{ - cpufreq_frequency_table_put_attr(policy->cpu); - return 0; -} - -static struct cpufreq_driver u8500_driver = { - .owner = THIS_MODULE, - .flags = CPUFREQ_STICKY, - .verify = u8500_cpufreq_verify_speed, - .target = u8500_cpufreq_target, - .get = u8500_cpufreq_getspeed, - .init = u8500_cpu_init, - .exit = u8500_cpu_exit, - .name = CPUFREQ_NAME, - .attr = u8500_cpufreq_attr, -}; - -static int __init u8500_cpufreq_probe(struct platform_device *pdev) -{ - dev = &pdev->dev; - return cpufreq_register_driver(&u8500_driver); -} - -static int __exit u8500_cpufreq_remove(struct platform_device *pdev) -{ - return cpufreq_unregister_driver(&u8500_driver); -} - -static struct platform_driver u8500_cpufreq_driver = { - .driver = { - .name = DRIVER_NAME, - .owner = THIS_MODULE, - }, - .remove = __exit_p(u8500_cpufreq_remove), -}; - -static int __init u8500_cpufreq_init(void) -{ - return platform_driver_probe(&u8500_cpufreq_driver, - &u8500_cpufreq_probe); -} - -device_initcall(u8500_cpufreq_init); |