2 * Copyright (C) STMicroelectronics 2009
3 * Copyright (C) ST-Ericsson SA 2010-2012
5 * License Terms: GNU General Public License v2
6 * Author: Sundar Iyer <sundar.iyer@stericsson.com>
7 * Author: Martin Persson <martin.persson@stericsson.com>
8 * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/cpufreq.h>
14 #include <linux/delay.h>
15 #include <linux/slab.h>
16 #include <linux/platform_device.h>
17 #include <linux/clk.h>
19 static struct cpufreq_frequency_table *freq_table;
20 static struct clk *armss_clk;
22 static int dbx500_cpufreq_target(struct cpufreq_policy *policy,
25 /* update armss clk frequency */
26 return clk_set_rate(armss_clk, freq_table[index].frequency * 1000);
29 static int dbx500_cpufreq_init(struct cpufreq_policy *policy)
31 policy->clk = armss_clk;
32 return cpufreq_generic_init(policy, freq_table, 20 * 1000);
35 static struct cpufreq_driver dbx500_cpufreq_driver = {
36 .flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS |
37 CPUFREQ_NEED_INITIAL_FREQ_CHECK,
38 .verify = cpufreq_generic_frequency_table_verify,
39 .target_index = dbx500_cpufreq_target,
40 .get = cpufreq_generic_get,
41 .init = dbx500_cpufreq_init,
43 .attr = cpufreq_generic_attr,
46 static int dbx500_cpufreq_probe(struct platform_device *pdev)
50 freq_table = dev_get_platdata(&pdev->dev);
52 pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n");
56 armss_clk = clk_get(&pdev->dev, "armss");
57 if (IS_ERR(armss_clk)) {
58 pr_err("dbx500-cpufreq: Failed to get armss clk\n");
59 return PTR_ERR(armss_clk);
62 pr_info("dbx500-cpufreq: Available frequencies:\n");
63 while (freq_table[i].frequency != CPUFREQ_TABLE_END) {
64 pr_info(" %d Mhz\n", freq_table[i].frequency/1000);
68 return cpufreq_register_driver(&dbx500_cpufreq_driver);
71 static struct platform_driver dbx500_cpufreq_plat_driver = {
73 .name = "cpufreq-ux500",
76 .probe = dbx500_cpufreq_probe,
79 static int __init dbx500_cpufreq_register(void)
81 return platform_driver_register(&dbx500_cpufreq_plat_driver);
83 device_initcall(dbx500_cpufreq_register);
85 MODULE_LICENSE("GPL v2");
86 MODULE_DESCRIPTION("cpufreq driver for DBX500");