diff options
author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/cpufreq/dbx500-cpufreq.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/cpufreq/dbx500-cpufreq.c')
-rw-r--r-- | kernel/drivers/cpufreq/dbx500-cpufreq.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/kernel/drivers/cpufreq/dbx500-cpufreq.c b/kernel/drivers/cpufreq/dbx500-cpufreq.c new file mode 100644 index 000000000..5c3ec1dd4 --- /dev/null +++ b/kernel/drivers/cpufreq/dbx500-cpufreq.c @@ -0,0 +1,83 @@ +/* + * Copyright (C) STMicroelectronics 2009 + * 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> +#include <linux/delay.h> +#include <linux/slab.h> +#include <linux/platform_device.h> +#include <linux/clk.h> + +static struct cpufreq_frequency_table *freq_table; +static struct clk *armss_clk; + +static int dbx500_cpufreq_target(struct cpufreq_policy *policy, + unsigned int index) +{ + /* update armss clk frequency */ + return clk_set_rate(armss_clk, freq_table[index].frequency * 1000); +} + +static int dbx500_cpufreq_init(struct cpufreq_policy *policy) +{ + policy->clk = armss_clk; + return cpufreq_generic_init(policy, freq_table, 20 * 1000); +} + +static struct cpufreq_driver dbx500_cpufreq_driver = { + .flags = CPUFREQ_STICKY | CPUFREQ_CONST_LOOPS | + CPUFREQ_NEED_INITIAL_FREQ_CHECK, + .verify = cpufreq_generic_frequency_table_verify, + .target_index = dbx500_cpufreq_target, + .get = cpufreq_generic_get, + .init = dbx500_cpufreq_init, + .name = "DBX500", + .attr = cpufreq_generic_attr, +}; + +static int dbx500_cpufreq_probe(struct platform_device *pdev) +{ + struct cpufreq_frequency_table *pos; + + freq_table = dev_get_platdata(&pdev->dev); + if (!freq_table) { + pr_err("dbx500-cpufreq: Failed to fetch cpufreq table\n"); + return -ENODEV; + } + + 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"); + cpufreq_for_each_entry(pos, freq_table) + pr_info(" %d Mhz\n", pos->frequency / 1000); + + return cpufreq_register_driver(&dbx500_cpufreq_driver); +} + +static struct platform_driver dbx500_cpufreq_plat_driver = { + .driver = { + .name = "cpufreq-ux500", + }, + .probe = dbx500_cpufreq_probe, +}; + +static int __init dbx500_cpufreq_register(void) +{ + return platform_driver_register(&dbx500_cpufreq_plat_driver); +} +device_initcall(dbx500_cpufreq_register); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("cpufreq driver for DBX500"); |