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84 lines
2.2 KiB
84 lines
2.2 KiB
/* |
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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 int dbx500_cpufreq_init(struct cpufreq_policy *policy) |
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{ |
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policy->clk = armss_clk; |
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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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CPUFREQ_NEED_INITIAL_FREQ_CHECK, |
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.verify = cpufreq_generic_frequency_table_verify, |
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.target_index = dbx500_cpufreq_target, |
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.get = cpufreq_generic_get, |
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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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struct cpufreq_frequency_table *pos; |
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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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cpufreq_for_each_entry(pos, freq_table) |
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pr_info(" %d Mhz\n", pos->frequency / 1000); |
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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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