Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / cpufreq / dbx500-cpufreq.c

diff --git a/kernel/drivers/cpufreq/dbx500-cpufreq.c b/kernel/drivers/cpufreq/dbx500-cpufreq.c
new file mode 100644 (file)
index 0000000..5c3ec1d
--- /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");