diff options
Diffstat (limited to 'drivers/cpufreq/dbx500-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/dbx500-cpufreq.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/drivers/cpufreq/dbx500-cpufreq.c b/drivers/cpufreq/dbx500-cpufreq.c deleted file mode 100644 index 1fdb02b9f1ec..000000000000 --- a/drivers/cpufreq/dbx500-cpufreq.c +++ /dev/null @@ -1,166 +0,0 @@ -/* - * Copyright (C) STMicroelectronics 2009 - * Copyright (C) ST-Ericsson SA 2010-2012 - * - * 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/module.h> -#include <linux/kernel.h> -#include <linux/cpufreq.h> -#include <linux/delay.h> -#include <linux/slab.h> -#include <linux/platform_device.h> -#include <linux/clk.h> - -static struct cpufreq_frequency_table *freq_table; -static struct clk *armss_clk; - -static struct freq_attr *dbx500_cpufreq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; - -static int dbx500_cpufreq_verify_speed(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, freq_table); -} - -static int dbx500_cpufreq_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - struct cpufreq_freqs freqs; - unsigned int idx; - int ret; - - /* 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 */ - cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); - - /* update armss clk frequency */ - ret = clk_set_rate(armss_clk, freqs.new * 1000); - - if (ret) { - pr_err("dbx500-cpufreq: Failed to set armss_clk to %d Hz: error %d\n", - freqs.new * 1000, ret); - freqs.new = freqs.old; - } - - /* post change notification */ - cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); - - return ret; -} - -static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu) -{ - int i = 0; - unsigned long freq = clk_get_rate(armss_clk) / 1000; - - /* The value is rounded to closest frequency in the defined table. */ - while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) { - if (freq < freq_table[i].frequency + - (freq_table[i + 1].frequency - freq_table[i].frequency) / 2) - return freq_table[i].frequency; - i++; - } - - return freq_table[i].frequency; -} - -static int __cpuinit dbx500_cpufreq_init(struct cpufreq_policy *policy) -{ - int res; - - /* 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("dbx500-cpufreq: Failed to read policy table\n"); - return res; - } - - policy->min = policy->cpuinfo.min_freq; - policy->max = policy->cpuinfo.max_freq; - policy->cur = dbx500_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_setall(policy->cpus); - - return 0; -} - -static struct cpufreq_driver dbx500_cpufreq_driver = { - .flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS, - .verify = dbx500_cpufreq_verify_speed, - .target = dbx500_cpufreq_target, - .get = dbx500_cpufreq_getspeed, - .init = dbx500_cpufreq_init, - .name = "DBX500", - .attr = dbx500_cpufreq_attr, -}; - -static int dbx500_cpufreq_probe(struct platform_device *pdev) -{ - int i = 0; - - freq_table = dev_get_platdata(&pdev->dev); - if (!freq_table) { - pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n"); - return -ENODEV; - } - - armss_clk = clk_get(&pdev->dev, "armss"); - if (IS_ERR(armss_clk)) { - pr_err("dbx500-cpufreq: Failed to get armss clk\n"); - return PTR_ERR(armss_clk); - } - - pr_info("dbx500-cpufreq: Available frequencies:\n"); - while (freq_table[i].frequency != CPUFREQ_TABLE_END) { - pr_info(" %d Mhz\n", freq_table[i].frequency/1000); - i++; - } - - return cpufreq_register_driver(&dbx500_cpufreq_driver); -} - -static struct platform_driver dbx500_cpufreq_plat_driver = { - .driver = { - .name = "cpufreq-ux500", - .owner = THIS_MODULE, - }, - .probe = dbx500_cpufreq_probe, -}; - -static int __init dbx500_cpufreq_register(void) -{ - return platform_driver_register(&dbx500_cpufreq_plat_driver); -} -device_initcall(dbx500_cpufreq_register); - -MODULE_LICENSE("GPL v2"); -MODULE_DESCRIPTION("cpufreq driver for DBX500"); |