aboutsummaryrefslogtreecommitdiff
path: root/drivers/cpufreq
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/Kconfig.arm10
-rw-r--r--drivers/cpufreq/Makefile1
-rw-r--r--drivers/cpufreq/vexpress_big_little.c86
3 files changed, 96 insertions, 1 deletions
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 6e57543fe0b..8327444b76c 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -4,7 +4,7 @@
config ARM_BIG_LITTLE_CPUFREQ
tristate "Generic ARM big LITTLE CPUfreq driver"
- depends on ARM_CPU_TOPOLOGY && PM_OPP && HAVE_CLK
+ depends on ARM_CPU_TOPOLOGY && PM_OPP && HAVE_CLK && BIG_LITTLE
help
This enables the Generic CPUfreq driver for ARM big.LITTLE platforms.
@@ -15,6 +15,14 @@ config ARM_DT_BL_CPUFREQ
This enables probing via DT for Generic CPUfreq driver for ARM
big.LITTLE platform. This gets frequency tables from DT.
+config ARM_VEXPRESS_BL_CPUFREQ
+ tristate "ARM Vexpress big LITTLE CPUfreq driver"
+ select ARM_BIG_LITTLE_CPUFREQ
+ depends on VEXPRESS_SPC
+ help
+ This enables the CPUfreq driver for ARM Vexpress big.LITTLE platform.
+ If in doubt, say N.
+
config ARM_EXYNOS_CPUFREQ
bool "SAMSUNG EXYNOS SoCs"
depends on ARCH_EXYNOS
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 315b9231feb..1db9b4929cf 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -48,6 +48,7 @@ obj-$(CONFIG_X86_AMD_FREQ_SENSITIVITY) += amd_freq_sensitivity.o
obj-$(CONFIG_ARM_BIG_LITTLE_CPUFREQ) += arm_big_little.o
# big LITTLE per platform glues. Keep DT_BL_CPUFREQ as the last entry in all big
# LITTLE drivers, so that it is probed last.
+obj-$(CONFIG_ARM_VEXPRESS_BL_CPUFREQ) += vexpress_big_little.o
obj-$(CONFIG_ARM_DT_BL_CPUFREQ) += arm_big_little_dt.o
obj-$(CONFIG_ARCH_DAVINCI_DA850) += davinci-cpufreq.o
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");