101 lines
2.6 KiB
C
101 lines
2.6 KiB
C
/*
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* Copyright (C) STMicroelectronics 2009
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* Copyright (C) ST-Ericsson SA 2010-2012
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*
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* License Terms: GNU General Public License v2
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* Author: Sundar Iyer <sundar.iyer@stericsson.com>
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* Author: Martin Persson <martin.persson@stericsson.com>
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* Author: Jonas Aaberg <jonas.aberg@stericsson.com>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/clk.h>
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static struct cpufreq_frequency_table *freq_table;
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static struct clk *armss_clk;
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static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
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unsigned int index)
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{
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/* update armss clk frequency */
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return clk_set_rate(armss_clk, freq_table[index].frequency * 1000);
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}
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static unsigned int dbx500_cpufreq_getspeed(unsigned int cpu)
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{
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int i = 0;
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unsigned long freq = clk_get_rate(armss_clk) / 1000;
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/* The value is rounded to closest frequency in the defined table. */
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while (freq_table[i + 1].frequency != CPUFREQ_TABLE_END) {
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if (freq < freq_table[i].frequency +
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(freq_table[i + 1].frequency - freq_table[i].frequency) / 2)
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return freq_table[i].frequency;
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i++;
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}
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return freq_table[i].frequency;
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}
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static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
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{
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return cpufreq_generic_init(policy, freq_table, 20 * 1000);
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}
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static struct cpufreq_driver dbx500_cpufreq_driver = {
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.flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS,
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.verify = cpufreq_generic_frequency_table_verify,
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.target_index = dbx500_cpufreq_target,
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.get = dbx500_cpufreq_getspeed,
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.init = dbx500_cpufreq_init,
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.name = "DBX500",
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.attr = cpufreq_generic_attr,
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};
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static int dbx500_cpufreq_probe(struct platform_device *pdev)
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{
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int i = 0;
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freq_table = dev_get_platdata(&pdev->dev);
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if (!freq_table) {
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pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
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return -ENODEV;
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}
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armss_clk = clk_get(&pdev->dev, "armss");
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if (IS_ERR(armss_clk)) {
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pr_err("dbx500-cpufreq: Failed to get armss clk\n");
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return PTR_ERR(armss_clk);
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}
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pr_info("dbx500-cpufreq: Available frequencies:\n");
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while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
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pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
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i++;
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}
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return cpufreq_register_driver(&dbx500_cpufreq_driver);
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}
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static struct platform_driver dbx500_cpufreq_plat_driver = {
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.driver = {
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.name = "cpufreq-ux500",
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.owner = THIS_MODULE,
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},
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.probe = dbx500_cpufreq_probe,
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};
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static int __init dbx500_cpufreq_register(void)
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{
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return platform_driver_register(&dbx500_cpufreq_plat_driver);
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}
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device_initcall(dbx500_cpufreq_register);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("cpufreq driver for DBX500");
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