cpufreq: mvebu: Move cpufreq code into drivers/cpufreq/

Move cpufreq bits for mvebu into drivers/cpufreq/ directory, that's
where they really belong to.

Compiled tested only.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 107 insertions, 0 deletions

diff --git a/drivers/cpufreq/mvebu-cpufreq.c b/drivers/cpufreq/mvebu-cpufreq.c
new file mode 100644
index 000000000000..e920889b9ac2
--- /dev/null
+++ b/drivers/cpufreq/mvebu-cpufreq.c
@@ -0,0 +1,107 @@
+/*
+ * CPUFreq support for Armada 370/XP platforms.
+ *
+ * Copyright (C) 2012-2016 Marvell
+ *
+ * Yehuda Yitschak <yehuday@marvell.com>
+ * Gregory Clement <gregory.clement@free-electrons.com>
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#define pr_fmt(fmt) "mvebu-pmsu: " fmt
+
+#include <linux/clk.h>
+#include <linux/cpu.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/resource.h>
+
+static int __init armada_xp_pmsu_cpufreq_init(void)
+{
+        struct device_node *np;
+        struct resource res;
+        int ret, cpu;
+
+        if (!of_machine_is_compatible("marvell,armadaxp"))
+                return 0;
+
+        /*
+         * In order to have proper cpufreq handling, we need to ensure
+         * that the Device Tree description of the CPU clock includes
+         * the definition of the PMU DFS registers. If not, we do not
+         * register the clock notifier and the cpufreq driver. This
+         * piece of code is only for compatibility with old Device
+         * Trees.
+         */
+        np = of_find_compatible_node(NULL, NULL, "marvell,armada-xp-cpu-clock");
+        if (!np)
+                return 0;
+
+        ret = of_address_to_resource(np, 1, &res);
+        if (ret) {
+                pr_warn(FW_WARN "not enabling cpufreq, deprecated armada-xp-cpu-clock binding\n");
+                of_node_put(np);
+                return 0;
+        }
+
+        of_node_put(np);
+
+        /*
+         * For each CPU, this loop registers the operating points
+         * supported (which are the nominal CPU frequency and half of
+         * it), and registers the clock notifier that will take care
+         * of doing the PMSU part of a frequency transition.
+         */
+        for_each_possible_cpu(cpu) {
+                struct device *cpu_dev;
+                struct clk *clk;
+                int ret;
+
+                cpu_dev = get_cpu_device(cpu);
+                if (!cpu_dev) {
+                        pr_err("Cannot get CPU %d\n", cpu);
+                        continue;
+                }
+
+                clk = clk_get(cpu_dev, 0);
+                if (IS_ERR(clk)) {
+                        pr_err("Cannot get clock for CPU %d\n", cpu);
+                        return PTR_ERR(clk);
+                }
+
+                /*
+                 * In case of a failure of dev_pm_opp_add(), we don't
+                 * bother with cleaning up the registered OPP (there's
+                 * no function to do so), and simply cancel the
+                 * registration of the cpufreq device.
+                 */
+                ret = dev_pm_opp_add(cpu_dev, clk_get_rate(clk), 0);
+                if (ret) {
+                        clk_put(clk);
+                        return ret;
+                }
+
+                ret = dev_pm_opp_add(cpu_dev, clk_get_rate(clk) / 2, 0);
+                if (ret) {
+                        clk_put(clk);
+                        return ret;
+                }
+
+                ret = dev_pm_opp_set_sharing_cpus(cpu_dev,
+                                                  cpumask_of(cpu_dev->id));
+                if (ret)
+                        dev_err(cpu_dev, "%s: failed to mark OPPs as shared: %d\n",
+                                __func__, ret);
+        }
+
+        platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+        return 0;
+}
+device_initcall(armada_xp_pmsu_cpufreq_init);