/*
* Copyright (C) STMicroelectronics 2009
- * Copyright (C) ST-Ericsson SA 2010
+ * 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>
static struct cpufreq_frequency_table *freq_table;
static struct clk *armss_clk;
-static struct freq_attr *db8500_cpufreq_attr[] = {
+static struct freq_attr *dbx500_cpufreq_attr[] = {
&cpufreq_freq_attr_scaling_available_freqs,
NULL,
};
-static int db8500_cpufreq_verify_speed(struct cpufreq_policy *policy)
+static int dbx500_cpufreq_verify_speed(struct cpufreq_policy *policy)
{
return cpufreq_frequency_table_verify(policy, freq_table);
}
-static int db8500_cpufreq_target(struct cpufreq_policy *policy,
+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;
/* scale the target frequency to one of the extremes supported */
if (target_freq < policy->cpuinfo.min_freq)
target_freq = policy->cpuinfo.max_freq;
/* Lookup the next frequency */
- if (cpufreq_frequency_table_target
- (policy, freq_table, target_freq, relation, &idx)) {
+ if (cpufreq_frequency_table_target(policy, freq_table, target_freq,
+ relation, &idx))
return -EINVAL;
- }
freqs.old = policy->cur;
freqs.new = freq_table[idx].frequency;
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
/* update armss clk frequency */
- if (clk_set_rate(armss_clk, freq_table[idx].frequency * 1000)) {
- pr_err("db8500-cpufreq: Failed to update armss clk\n");
- return -EINVAL;
+ 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);
+ return ret;
}
/* post change notification */
return 0;
}
-static unsigned int db8500_cpufreq_getspeed(unsigned int cpu)
+static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
{
int i = 0;
unsigned long freq = clk_get_rate(armss_clk) / 1000;
}
/* We could not find a corresponding frequency. */
- pr_err("db8500-cpufreq: Failed to find cpufreq speed\n");
+ pr_err("dbx500-cpufreq: Failed to find cpufreq speed\n");
return 0;
}
-static int __cpuinit db8500_cpufreq_init(struct cpufreq_policy *policy)
+static int __cpuinit dbx500_cpufreq_init(struct cpufreq_policy *policy)
{
- int i = 0;
int res;
- armss_clk = clk_get(NULL, "armss");
- if (IS_ERR(armss_clk)) {
- pr_err("db8500-cpufreq : Failed to get armss clk\n");
- return PTR_ERR(armss_clk);
- }
-
- pr_info("db8500-cpufreq : Available frequencies:\n");
- while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
- pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
- i++;
- }
-
/* 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");
- clk_put(armss_clk);
+ 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 = db8500_cpufreq_getspeed(policy->cpu);
+ policy->cur = dbx500_cpufreq_getspeed(policy->cpu);
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
/*
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 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 db8500_cpufreq_probe(struct platform_device *pdev)
+static int dbx500_cpufreq_probe(struct platform_device *pdev)
{
- freq_table = dev_get_platdata(&pdev->dev);
+ int i = 0;
+ freq_table = dev_get_platdata(&pdev->dev);
if (!freq_table) {
- pr_err("db8500-cpufreq: Failed to fetch cpufreq table\n");
+ pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
return -ENODEV;
}
- return cpufreq_register_driver(&db8500_cpufreq_driver);
+ 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 db8500_cpufreq_plat_driver = {
+static struct platform_driver dbx500_cpufreq_plat_driver = {
.driver = {
- .name = "cpufreq-u8500",
+ .name = "cpufreq-ux500",
.owner = THIS_MODULE,
},
- .probe = db8500_cpufreq_probe,
+ .probe = dbx500_cpufreq_probe,
};
-static int __init db8500_cpufreq_register(void)
+static int __init dbx500_cpufreq_register(void)
{
- pr_info("cpufreq for DB8500 started\n");
- return platform_driver_register(&db8500_cpufreq_plat_driver);
+ return platform_driver_register(&dbx500_cpufreq_plat_driver);
}
-device_initcall(db8500_cpufreq_register);
+device_initcall(dbx500_cpufreq_register);
MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("cpufreq driver for DB8500");
+MODULE_DESCRIPTION("cpufreq driver for DBX500");
projects / linux-beck.git / blobdiff