cpufreq: ARM big LITTLE: Add generic cpufreq driver and its DT glue

big LITTLE is ARM's new Architecture focussing power/performance needs of modern
world. More information about big LITTLE can be found here:

http://www.arm.com/products/processors/technologies/biglittleprocessing.php
http://lwn.net/Articles/481055/

In order to keep cpufreq support for all big LITTLE platforms simple/generic,
this patch tries to add a generic cpufreq driver layer for all big LITTLE
platforms.

The driver is divided into two parts:
- Core driver: Generic and shared across all big LITTLE SoC's
- Glue drivers: Per platform drivers providing ops to the core driver

This patch adds in a generic glue driver which would extract information from
Device Tree.

Future SoC's can either reuse the DT glue or write their own depending on the
need.

Signed-off-by: Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

7 files changed, 507 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt b/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt
new file mode 100644
index 000000000000..0715695e94a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/cpufreq/arm_big_little_dt.txt
@@ -0,0 +1,65 @@
+Generic ARM big LITTLE cpufreq driver's DT glue
+-----------------------------------------------
+
+This is DT specific glue layer for generic cpufreq driver for big LITTLE
+systems.
+
+Both required and optional properties listed below must be defined
+under node /cpus/cpu@x. Where x is the first cpu inside a cluster.
+
+FIXME: Cpus should boot in the order specified in DT and all cpus for a cluster
+must be present contiguously. Generic DT driver will check only node 'x' for
+cpu:x.
+
+Required properties:
+- operating-points: Refer to Documentation/devicetree/bindings/power/opp.txt
+  for details
+
+Optional properties:
+- clock-latency: Specify the possible maximum transition latency for clock,
+  in unit of nanoseconds.
+
+Examples:
+
+cpus {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        cpu@0 {
+                compatible = "arm,cortex-a15";
+                reg = <0>;
+                next-level-cache = <&L2>;
+                operating-points = <
+                        /* kHz    uV */
+                        792000  1100000
+                        396000  950000
+                        198000  850000
+                >;
+                clock-latency = <61036>; /* two CLK32 periods */
+        };
+
+        cpu@1 {
+                compatible = "arm,cortex-a15";
+                reg = <1>;
+                next-level-cache = <&L2>;
+        };
+
+        cpu@100 {
+                compatible = "arm,cortex-a7";
+                reg = <100>;
+                next-level-cache = <&L2>;
+                operating-points = <
+                        /* kHz    uV */
+                        792000  950000
+                        396000  750000
+                        198000  450000
+                >;
+                clock-latency = <61036>; /* two CLK32 periods */
+        };
+
+        cpu@101 {
+                compatible = "arm,cortex-a7";
+                reg = <101>;
+                next-level-cache = <&L2>;
+        };
+};
diff --git a/MAINTAINERS b/MAINTAINERS
index 74e58a4d035b..be739837d6c3 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -2206,6 +2206,17 @@ S:	Maintained
 F:      drivers/cpufreq/
 F:      include/linux/cpufreq.h
 
+CPU FREQUENCY DRIVERS - ARM BIG LITTLE
+M:      Viresh Kumar <viresh.kumar@linaro.org>
+M:      Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+L:      cpufreq@vger.kernel.org
+L:      linux-pm@vger.kernel.org
+W:      http://www.arm.com/products/processors/technologies/biglittleprocessing.php
+S:      Maintained
+F:      drivers/cpufreq/arm_big_little.h
+F:      drivers/cpufreq/arm_big_little.c
+F:      drivers/cpufreq/arm_big_little_dt.c
+
 CPUID/MSR DRIVER
 M:      "H. Peter Anvin" <hpa@zytor.com>
 S:      Maintained
diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 030ddf6dd3f1..87b7e48698d0 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -2,6 +2,18 @@
 # ARM CPU Frequency scaling drivers
 #
 
+config ARM_BIG_LITTLE_CPUFREQ
+        tristate
+        depends on ARM_CPU_TOPOLOGY
+
+config ARM_DT_BL_CPUFREQ
+        tristate "Generic ARM big LITTLE CPUfreq driver probed via DT"
+        select ARM_BIG_LITTLE_CPUFREQ
+        depends on OF && HAVE_CLK
+        help
+          This enables the Generic CPUfreq driver for ARM big.LITTLE platform.
+          This gets frequency tables from DT.
+
 config ARM_OMAP2PLUS_CPUFREQ
         bool "TI OMAP2+"
         depends on ARCH_OMAP2PLUS
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index 863fd1865d45..ba9a3e1b1e69 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -44,6 +44,11 @@ obj-$(CONFIG_X86_INTEL_PSTATE)		+= intel_pstate.o
 
 ##################################################################################
 # ARM SoC drivers
+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_DT_BL_CPUFREQ)         += arm_big_little_dt.o
+
 obj-$(CONFIG_UX500_SOC_DB8500)          += dbx500-cpufreq.o
 obj-$(CONFIG_ARM_S3C2416_CPUFREQ)       += s3c2416-cpufreq.o
 obj-$(CONFIG_ARM_S3C64XX_CPUFREQ)       += s3c64xx-cpufreq.o
diff --git a/drivers/cpufreq/arm_big_little.c b/drivers/cpufreq/arm_big_little.c
new file mode 100644
index 000000000000..1d29d1acbda7
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little.c
@@ -0,0 +1,282 @@
+/*
+ * ARM big.LITTLE Platforms CPUFreq support
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+ *
+ * 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/clk.h>
+#include <linux/cpu.h>
+#include <linux/cpufreq.h>
+#include <linux/cpumask.h>
+#include <linux/export.h>
+#include <linux/of_platform.h>
+#include <linux/opp.h>
+#include <linux/slab.h>
+#include <linux/topology.h>
+#include <linux/types.h>
+
+#include "arm_big_little.h"
+
+/* Currently we support only two clusters */
+#define MAX_CLUSTERS    2
+
+static struct cpufreq_arm_bL_ops *arm_bL_ops;
+static struct clk *clk[MAX_CLUSTERS];
+static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS];
+static atomic_t cluster_usage[MAX_CLUSTERS] = {ATOMIC_INIT(0), ATOMIC_INIT(0)};
+
+static int cpu_to_cluster(int cpu)
+{
+        return topology_physical_package_id(cpu);
+}
+
+static unsigned int bL_cpufreq_get(unsigned int cpu)
+{
+        u32 cur_cluster = cpu_to_cluster(cpu);
+
+        return clk_get_rate(clk[cur_cluster]) / 1000;
+}
+
+/* Validate policy frequency range */
+static int bL_cpufreq_verify_policy(struct cpufreq_policy *policy)
+{
+        u32 cur_cluster = cpu_to_cluster(policy->cpu);
+
+        return cpufreq_frequency_table_verify(policy, freq_table[cur_cluster]);
+}
+
+/* Set clock frequency */
+static int bL_cpufreq_set_target(struct cpufreq_policy *policy,
+                unsigned int target_freq, unsigned int relation)
+{
+        struct cpufreq_freqs freqs;
+        u32 cpu = policy->cpu, freq_tab_idx, cur_cluster;
+        int ret = 0;
+
+        cur_cluster = cpu_to_cluster(policy->cpu);
+
+        freqs.old = bL_cpufreq_get(policy->cpu);
+
+        /* Determine valid target frequency using freq_table */
+        cpufreq_frequency_table_target(policy, freq_table[cur_cluster],
+                        target_freq, relation, &freq_tab_idx);
+        freqs.new = freq_table[cur_cluster][freq_tab_idx].frequency;
+
+        freqs.cpu = policy->cpu;
+
+        pr_debug("%s: cpu: %d, cluster: %d, oldfreq: %d, target freq: %d, new freq: %d\n",
+                        __func__, cpu, cur_cluster, freqs.old, target_freq,
+                        freqs.new);
+
+        if (freqs.old == freqs.new)
+                return 0;
+
+        for_each_cpu(freqs.cpu, policy->cpus)
+                cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
+        ret = clk_set_rate(clk[cur_cluster], freqs.new * 1000);
+        if (ret) {
+                pr_err("clk_set_rate failed: %d\n", ret);
+                return ret;
+        }
+
+        policy->cur = freqs.new;
+
+        for_each_cpu(freqs.cpu, policy->cpus)
+                cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
+
+        return ret;
+}
+
+static void put_cluster_clk_and_freq_table(struct device *cpu_dev)
+{
+        u32 cluster = cpu_to_cluster(cpu_dev->id);
+
+        if (!atomic_dec_return(&cluster_usage[cluster])) {
+                clk_put(clk[cluster]);
+                opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+                dev_dbg(cpu_dev, "%s: cluster: %d\n", __func__, cluster);
+        }
+}
+
+static int get_cluster_clk_and_freq_table(struct device *cpu_dev)
+{
+        u32 cluster = cpu_to_cluster(cpu_dev->id);
+        char name[14] = "cpu-cluster.";
+        int ret;
+
+        if (atomic_inc_return(&cluster_usage[cluster]) != 1)
+                return 0;
+
+        ret = arm_bL_ops->init_opp_table(cpu_dev);
+        if (ret) {
+                dev_err(cpu_dev, "%s: init_opp_table failed, cpu: %d, err: %d\n",
+                                __func__, cpu_dev->id, ret);
+                goto atomic_dec;
+        }
+
+        ret = opp_init_cpufreq_table(cpu_dev, &freq_table[cluster]);
+        if (ret) {
+                dev_err(cpu_dev, "%s: failed to init cpufreq table, cpu: %d, err: %d\n",
+                                __func__, cpu_dev->id, ret);
+                goto atomic_dec;
+        }
+
+        name[12] = cluster + '0';
+        clk[cluster] = clk_get_sys(name, NULL);
+        if (!IS_ERR(clk[cluster])) {
+                dev_dbg(cpu_dev, "%s: clk: %p & freq table: %p, cluster: %d\n",
+                                __func__, clk[cluster], freq_table[cluster],
+                                cluster);
+                return 0;
+        }
+
+        dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d, cluster: %d\n",
+                        __func__, cpu_dev->id, cluster);
+        ret = PTR_ERR(clk[cluster]);
+        opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]);
+
+atomic_dec:
+        atomic_dec(&cluster_usage[cluster]);
+        dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__,
+                        cluster);
+        return ret;
+}
+
+/* Per-CPU initialization */
+static int bL_cpufreq_init(struct cpufreq_policy *policy)
+{
+        u32 cur_cluster = cpu_to_cluster(policy->cpu);
+        struct device *cpu_dev;
+        int ret;
+
+        cpu_dev = get_cpu_device(policy->cpu);
+        if (!cpu_dev) {
+                pr_err("%s: failed to get cpu%d device\n", __func__,
+                                policy->cpu);
+                return -ENODEV;
+        }
+
+        ret = get_cluster_clk_and_freq_table(cpu_dev);
+        if (ret)
+                return ret;
+
+        ret = cpufreq_frequency_table_cpuinfo(policy, freq_table[cur_cluster]);
+        if (ret) {
+                dev_err(cpu_dev, "CPU %d, cluster: %d invalid freq table\n",
+                                policy->cpu, cur_cluster);
+                put_cluster_clk_and_freq_table(cpu_dev);
+                return ret;
+        }
+
+        cpufreq_frequency_table_get_attr(freq_table[cur_cluster], policy->cpu);
+
+        if (arm_bL_ops->get_transition_latency)
+                policy->cpuinfo.transition_latency =
+                        arm_bL_ops->get_transition_latency(cpu_dev);
+        else
+                policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
+
+        policy->cur = bL_cpufreq_get(policy->cpu);
+
+        cpumask_copy(policy->cpus, topology_core_cpumask(policy->cpu));
+
+        dev_info(cpu_dev, "CPU %d initialized\n", policy->cpu);
+        return 0;
+}
+
+static int bL_cpufreq_exit(struct cpufreq_policy *policy)
+{
+        struct device *cpu_dev;
+
+        cpu_dev = get_cpu_device(policy->cpu);
+        if (!cpu_dev) {
+                pr_err("%s: failed to get cpu%d device\n", __func__,
+                                policy->cpu);
+                return -ENODEV;
+        }
+
+        put_cluster_clk_and_freq_table(cpu_dev);
+        dev_dbg(cpu_dev, "%s: Exited, cpu: %d\n", __func__, policy->cpu);
+
+        return 0;
+}
+
+/* Export freq_table to sysfs */
+static struct freq_attr *bL_cpufreq_attr[] = {
+        &cpufreq_freq_attr_scaling_available_freqs,
+        NULL,
+};
+
+static struct cpufreq_driver bL_cpufreq_driver = {
+        .name                   = "arm-big-little",
+        .flags                  = CPUFREQ_STICKY,
+        .verify                 = bL_cpufreq_verify_policy,
+        .target                 = bL_cpufreq_set_target,
+        .get                    = bL_cpufreq_get,
+        .init                   = bL_cpufreq_init,
+        .exit                   = bL_cpufreq_exit,
+        .have_multiple_policies = true,
+        .attr                   = bL_cpufreq_attr,
+};
+
+int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops)
+{
+        int ret;
+
+        if (arm_bL_ops) {
+                pr_debug("%s: Already registered: %s, exiting\n", __func__,
+                                arm_bL_ops->name);
+                return -EBUSY;
+        }
+
+        if (!ops || !strlen(ops->name) || !ops->init_opp_table) {
+                pr_err("%s: Invalid arm_bL_ops, exiting\n", __func__);
+                return -ENODEV;
+        }
+
+        arm_bL_ops = ops;
+
+        ret = cpufreq_register_driver(&bL_cpufreq_driver);
+        if (ret) {
+                pr_info("%s: Failed registering platform driver: %s, err: %d\n",
+                                __func__, ops->name, ret);
+                arm_bL_ops = NULL;
+        } else {
+                pr_info("%s: Registered platform driver: %s\n", __func__,
+                                ops->name);
+        }
+
+        return ret;
+}
+EXPORT_SYMBOL_GPL(bL_cpufreq_register);
+
+void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops)
+{
+        if (arm_bL_ops != ops) {
+                pr_err("%s: Registered with: %s, can't unregister, exiting\n",
+                                __func__, arm_bL_ops->name);
+                return;
+        }
+
+        cpufreq_unregister_driver(&bL_cpufreq_driver);
+        pr_info("%s: Un-registered platform driver: %s\n", __func__,
+                        arm_bL_ops->name);
+        arm_bL_ops = NULL;
+}
+EXPORT_SYMBOL_GPL(bL_cpufreq_unregister);
diff --git a/drivers/cpufreq/arm_big_little.h b/drivers/cpufreq/arm_big_little.h
new file mode 100644
index 000000000000..70f18fc12d4a
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little.h
@@ -0,0 +1,40 @@
+/*
+ * ARM big.LITTLE platform's CPUFreq header file
+ *
+ * Copyright (C) 2013 ARM Ltd.
+ * Sudeep KarkadaNagesha <sudeep.karkadanagesha@arm.com>
+ *
+ * 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.
+ */
+#ifndef CPUFREQ_ARM_BIG_LITTLE_H
+#define CPUFREQ_ARM_BIG_LITTLE_H
+
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/types.h>
+
+struct cpufreq_arm_bL_ops {
+        char name[CPUFREQ_NAME_LEN];
+        int (*get_transition_latency)(struct device *cpu_dev);
+
+        /*
+         * This must set opp table for cpu_dev in a similar way as done by
+         * of_init_opp_table().
+         */
+        int (*init_opp_table)(struct device *cpu_dev);
+};
+
+int bL_cpufreq_register(struct cpufreq_arm_bL_ops *ops);
+void bL_cpufreq_unregister(struct cpufreq_arm_bL_ops *ops);
+
+#endif /* CPUFREQ_ARM_BIG_LITTLE_H */
diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c
new file mode 100644
index 000000000000..452ff46f20b7
--- /dev/null
+++ b/drivers/cpufreq/arm_big_little_dt.c
@@ -0,0 +1,92 @@
+/*
+ * Generic 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/device.h>
+#include <linux/export.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/opp.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include "arm_big_little.h"
+
+static int dt_init_opp_table(struct device *cpu_dev)
+{
+        struct device_node *np = NULL;
+        int count = 0, ret;
+
+        for_each_child_of_node(of_find_node_by_path("/cpus"), np) {
+                if (count++ != cpu_dev->id)
+                        continue;
+                if (!of_get_property(np, "operating-points", NULL))
+                        return -ENODATA;
+
+                cpu_dev->of_node = np;
+
+                ret = of_init_opp_table(cpu_dev);
+                if (ret)
+                        return ret;
+
+                return 0;
+        }
+
+        return -ENODEV;
+}
+
+static int dt_get_transition_latency(struct device *cpu_dev)
+{
+        struct device_node *np = NULL;
+        u32 transition_latency = CPUFREQ_ETERNAL;
+        int count = 0;
+
+        for_each_child_of_node(of_find_node_by_path("/cpus"), np) {
+                if (count++ != cpu_dev->id)
+                        continue;
+
+                of_property_read_u32(np, "clock-latency", &transition_latency);
+                return 0;
+        }
+
+        return -ENODEV;
+}
+
+static struct cpufreq_arm_bL_ops dt_bL_ops = {
+        .name   = "dt-bl",
+        .get_transition_latency = dt_get_transition_latency,
+        .init_opp_table = dt_init_opp_table,
+};
+
+static int generic_bL_init(void)
+{
+        return bL_cpufreq_register(&dt_bL_ops);
+}
+module_init(generic_bL_init);
+
+static void generic_bL_exit(void)
+{
+        return bL_cpufreq_unregister(&dt_bL_ops);
+}
+module_exit(generic_bL_exit);
+
+MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>");
+MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT");
+MODULE_LICENSE("GPL");