1 files changed, 86 insertions, 0 deletions
diff --git a/drivers/cpufreq/vexpress_big_little.c b/drivers/cpufreq/vexpress_big_little.c
new file mode 100644
index 00000000000..1abb883c051
--- /dev/null
+++ b/drivers/cpufreq/vexpress_big_little.c
@@ -0,0 +1,86 @@
+/*
+ * Vexpress big.LITTLE CPUFreq Interface driver
+ *
+ * It provides necessary ops to arm_big_little cpufreq driver and gets
+ * Frequency information from Device Tree. Freq table in DT must be in KHz.
+ *
+ * Copyright (C) 2013 Linaro.
+ * Viresh Kumar <viresh.kumar@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/cpufreq.h>
+#include <linux/export.h>
+#include <linux/opp.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/vexpress.h>
+#include "arm_big_little.h"
+
+static int vexpress_init_opp_table(struct device *cpu_dev)
+{
+	int i = -1, count, cluster = cpu_to_cluster(cpu_dev->id);
+	u32 *table;
+	int ret;
+
+	count = vexpress_spc_get_freq_table(cluster, &table);
+	if (!table || !count) {
+		pr_err("SPC controller returned invalid freq table");
+		return -EINVAL;
+	}
+
+	while (++i < count) {
+		/* FIXME: Voltage value */
+		ret = opp_add(cpu_dev, table[i] * 1000, 900000);
+		if (ret) {
+			dev_warn(cpu_dev, "%s: Failed to add OPP %d, err: %d\n",
+				 __func__, table[i] * 1000, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int vexpress_get_transition_latency(struct device *cpu_dev)
+{
+	/* 1 ms */
+	return 1000000;
+}
+
+static struct cpufreq_arm_bL_ops vexpress_bL_ops = {
+	.name	= "vexpress-bL",
+	.get_transition_latency = vexpress_get_transition_latency,
+	.init_opp_table = vexpress_init_opp_table,
+};
+
+static int vexpress_bL_init(void)
+{
+	if (!vexpress_spc_check_loaded()) {
+		pr_info("%s: No SPC found\n", __func__);
+		return -ENOENT;
+	}
+
+	return bL_cpufreq_register(&vexpress_bL_ops);
+}
+module_init(vexpress_bL_init);
+
+static void vexpress_bL_exit(void)
+{
+	return bL_cpufreq_unregister(&vexpress_bL_ops);
+}
+module_exit(vexpress_bL_exit);
+
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_DESCRIPTION("ARM Vexpress big LITTLE cpufreq driver");
+MODULE_LICENSE("GPL");