mirror of https://gitee.com/openkylin/linux.git
104 lines
2.7 KiB
C
104 lines
2.7 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/cpu_cooling.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 struct thermal_cooling_device *cdev;
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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 int dbx500_cpufreq_exit(struct cpufreq_policy *policy)
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{
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if (!IS_ERR(cdev))
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cpufreq_cooling_unregister(cdev);
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return 0;
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}
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static void dbx500_cpufreq_ready(struct cpufreq_policy *policy)
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{
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cdev = cpufreq_cooling_register(policy);
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if (IS_ERR(cdev))
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pr_err("Failed to register cooling device %ld\n", PTR_ERR(cdev));
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else
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pr_info("Cooling device registered: %s\n", cdev->type);
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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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.exit = dbx500_cpufreq_exit,
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.ready = dbx500_cpufreq_ready,
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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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},
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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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