+++ /dev/null
-From dd77db4143290689d3a5e1ec61627233d0711b66 Mon Sep 17 00:00:00 2001
-From: Stephen Boyd <sboyd@codeaurora.org>
-Date: Fri, 30 May 2014 16:36:11 -0700
-Subject: [PATCH] FROMLIST: cpufreq: Add a cpufreq-krait based on cpufreq-cpu0
-
-Krait processors have individual clocks for each CPU that can
-scale independently from one another. cpufreq-cpu0 is fairly
-close to this, but assumes that there is only one clock for all
-CPUs. Add a driver to support the Krait configuration.
-
-TODO: Merge into cpufreq-cpu0? Or make generic?
-
-Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
-
----
- drivers/cpufreq/Kconfig | 13 +++
- drivers/cpufreq/Makefile | 1 +
- drivers/cpufreq/cpufreq-krait.c | 190 ++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 204 insertions(+)
- create mode 100644 drivers/cpufreq/cpufreq-krait.c
-
---- a/drivers/cpufreq/Kconfig
-+++ b/drivers/cpufreq/Kconfig
-@@ -196,6 +196,19 @@ config CPUFREQ_DT
-
- If in doubt, say N.
-
-+config GENERIC_CPUFREQ_KRAIT
-+ tristate "Krait cpufreq driver"
-+ depends on HAVE_CLK && OF
-+ # if CPU_THERMAL is on and THERMAL=m, CPU0 cannot be =y:
-+ depends on !CPU_THERMAL || THERMAL
-+ select PM_OPP
-+ help
-+ This adds a generic cpufreq driver for CPU0 frequency management.
-+ It supports both uniprocessor (UP) and symmetric multiprocessor (SMP)
-+ systems which share clock and voltage across all CPUs.
-+
-+ If in doubt, say N.
-+
- menu "x86 CPU frequency scaling drivers"
- depends on X86
- source "drivers/cpufreq/Kconfig.x86"
---- a/drivers/cpufreq/Makefile
-+++ b/drivers/cpufreq/Makefile
-@@ -14,6 +14,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE)
- obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o
-
- obj-$(CONFIG_CPUFREQ_DT) += cpufreq-dt.o
-+obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT) += cpufreq-krait.o
-
- ##################################################################################
- # x86 drivers.
---- /dev/null
-+++ b/drivers/cpufreq/cpufreq-krait.c
-@@ -0,0 +1,390 @@
-+/*
-+ * Copyright (C) 2012 Freescale Semiconductor, Inc.
-+ * Copyright (c) 2014, The Linux Foundation. All rights reserved.
-+ *
-+ * The OPP code in function krait_set_target() is reused from
-+ * drivers/cpufreq/omap-cpufreq.c
-+ *
-+ * 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.
-+ */
-+
-+#include <linux/clk.h>
-+#include <linux/cpu.h>
-+#include <linux/cpu_cooling.h>
-+#include <linux/cpufreq.h>
-+#include <linux/cpumask.h>
-+#include <linux/err.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/pm_opp.h>
-+#include <linux/platform_device.h>
-+#include <linux/regulator/consumer.h>
-+#include <linux/slab.h>
-+#include <linux/thermal.h>
-+
-+static unsigned int transition_latency;
-+static unsigned int voltage_tolerance; /* in percentage */
-+
-+static struct device *cpu_dev;
-+static DEFINE_PER_CPU(struct clk *, krait_cpu_clks);
-+static DEFINE_PER_CPU(struct regulator *, krait_supply_core);
-+static struct cpufreq_frequency_table *freq_table;
-+static struct thermal_cooling_device *cdev;
-+
-+struct cache_points {
-+ unsigned long cache_freq;
-+ unsigned int cache_volt;
-+ unsigned long cpu_freq;
-+};
-+
-+static struct regulator *krait_l2_reg;
-+static struct clk *krait_l2_clk;
-+static struct cache_points *krait_l2_points;
-+static int nr_krait_l2_points;
-+
-+static int krait_parse_cache_points(struct device *dev,
-+ struct device_node *of_node)
-+{
-+ const struct property *prop;
-+ const __be32 *val;
-+ int nr, i;
-+
-+ prop = of_find_property(of_node, "cache-points-kHz", NULL);
-+ if (!prop)
-+ return -ENODEV;
-+ if (!prop->value)
-+ return -ENODATA;
-+
-+ /*
-+ * Each OPP is a set of tuples consisting of frequency and
-+ * cpu-frequency like <freq-kHz volt-uV freq-kHz>.
-+ */
-+ nr = prop->length / sizeof(u32);
-+ if (nr % 3) {
-+ dev_err(dev, "%s: Invalid cache points\n", __func__);
-+ return -EINVAL;
-+ }
-+ nr /= 3;
-+
-+ krait_l2_points = devm_kcalloc(dev, nr, sizeof(*krait_l2_points),
-+ GFP_KERNEL);
-+ if (!krait_l2_points)
-+ return -ENOMEM;
-+ nr_krait_l2_points = nr;
-+
-+ for (i = 0, val = prop->value; i < nr; i++) {
-+ unsigned long cache_freq = be32_to_cpup(val++) * 1000;
-+ unsigned int cache_volt = be32_to_cpup(val++);
-+ unsigned long cpu_freq = be32_to_cpup(val++) * 1000;
-+
-+ krait_l2_points[i].cache_freq = cache_freq;
-+ krait_l2_points[i].cache_volt = cache_volt;
-+ krait_l2_points[i].cpu_freq = cpu_freq;
-+ }
-+
-+ return 0;
-+}
-+
-+static int krait_set_target(struct cpufreq_policy *policy, unsigned int index)
-+{
-+ struct dev_pm_opp *opp;
-+ unsigned long volt = 0, volt_old = 0, tol = 0;
-+ unsigned long freq, max_cpu_freq = 0;
-+ unsigned int old_freq, new_freq;
-+ long freq_Hz, freq_exact;
-+ int ret, i;
-+ struct clk *cpu_clk;
-+ struct regulator *core;
-+ unsigned int cpu;
-+
-+ cpu_clk = per_cpu(krait_cpu_clks, policy->cpu);
-+
-+ freq_Hz = clk_round_rate(cpu_clk, freq_table[index].frequency * 1000);
-+ if (freq_Hz <= 0)
-+ freq_Hz = freq_table[index].frequency * 1000;
-+
-+ freq_exact = freq_Hz;
-+ new_freq = freq_Hz / 1000;
-+ old_freq = clk_get_rate(cpu_clk) / 1000;
-+
-+ core = per_cpu(krait_supply_core, policy->cpu);
-+
-+ rcu_read_lock();
-+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
-+ if (IS_ERR(opp)) {
-+ rcu_read_unlock();
-+ pr_err("failed to find OPP for %ld\n", freq_Hz);
-+ return PTR_ERR(opp);
-+ }
-+ volt = dev_pm_opp_get_voltage(opp);
-+ rcu_read_unlock();
-+ tol = volt * voltage_tolerance / 100;
-+ volt_old = regulator_get_voltage(core);
-+
-+ pr_debug("%u MHz, %ld mV --> %u MHz, %ld mV\n",
-+ old_freq / 1000, volt_old ? volt_old / 1000 : -1,
-+ new_freq / 1000, volt ? volt / 1000 : -1);
-+
-+ /* scaling up? scale voltage before frequency */
-+ if (new_freq > old_freq) {
-+ ret = regulator_set_voltage_tol(core, volt, tol);
-+ if (ret) {
-+ pr_err("failed to scale voltage up: %d\n", ret);
-+ return ret;
-+ }
-+ }
-+
-+ ret = clk_set_rate(cpu_clk, freq_exact);
-+ if (ret) {
-+ pr_err("failed to set clock rate: %d\n", ret);
-+ return ret;
-+ }
-+
-+ /* scaling down? scale voltage after frequency */
-+ if (new_freq < old_freq) {
-+ ret = regulator_set_voltage_tol(core, volt, tol);
-+ if (ret) {
-+ pr_err("failed to scale voltage down: %d\n", ret);
-+ clk_set_rate(cpu_clk, old_freq * 1000);
-+ }
-+ }
-+
-+ for_each_possible_cpu(cpu) {
-+ freq = clk_get_rate(per_cpu(krait_cpu_clks, cpu));
-+ max_cpu_freq = max(max_cpu_freq, freq);
-+ }
-+
-+ for (i = 0; i < nr_krait_l2_points; i++) {
-+ if (max_cpu_freq >= krait_l2_points[i].cpu_freq) {
-+ if (krait_l2_reg) {
-+ ret = regulator_set_voltage_tol(krait_l2_reg,
-+ krait_l2_points[i].cache_volt,
-+ tol);
-+ if (ret) {
-+ pr_err("failed to scale l2 voltage: %d\n",
-+ ret);
-+ }
-+ }
-+ ret = clk_set_rate(krait_l2_clk,
-+ krait_l2_points[i].cache_freq);
-+ if (ret)
-+ pr_err("failed to scale l2 clk: %d\n", ret);
-+ break;
-+ }
-+
-+ }
-+
-+ return ret;
-+}
-+
-+static int krait_cpufreq_init(struct cpufreq_policy *policy)
-+{
-+ int ret;
-+
-+ policy->clk = per_cpu(krait_cpu_clks, policy->cpu);
-+
-+ ret = cpufreq_table_validate_and_show(policy, freq_table);
-+ if (ret) {
-+ pr_err("%s: invalid frequency table: %d\n", __func__, ret);
-+ return ret;
-+ }
-+
-+ policy->cpuinfo.transition_latency = transition_latency;
-+
-+ return 0;
-+}
-+
-+static struct cpufreq_driver krait_cpufreq_driver = {
-+ .flags = CPUFREQ_STICKY,
-+ .verify = cpufreq_generic_frequency_table_verify,
-+ .target_index = krait_set_target,
-+ .get = cpufreq_generic_get,
-+ .init = krait_cpufreq_init,
-+ .name = "generic_krait",
-+ .attr = cpufreq_generic_attr,
-+};
-+
-+static int krait_cpufreq_probe(struct platform_device *pdev)
-+{
-+ struct device_node *np, *cache;
-+ int ret, i;
-+ unsigned int cpu;
-+ struct device *dev;
-+ struct clk *clk;
-+ struct regulator *core;
-+ unsigned long freq_Hz, freq, max_cpu_freq = 0;
-+ struct dev_pm_opp *opp;
-+ unsigned long volt, tol;
-+
-+ cpu_dev = get_cpu_device(0);
-+ if (!cpu_dev) {
-+ pr_err("failed to get krait device\n");
-+ return -ENODEV;
-+ }
-+
-+ np = of_node_get(cpu_dev->of_node);
-+ if (!np) {
-+ pr_err("failed to find krait node\n");
-+ return -ENOENT;
-+ }
-+
-+ ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table);
-+ if (ret) {
-+ pr_err("failed to init cpufreq table: %d\n", ret);
-+ goto out_put_node;
-+ }
-+
-+ of_property_read_u32(np, "voltage-tolerance", &voltage_tolerance);
-+
-+ if (of_property_read_u32(np, "clock-latency", &transition_latency))
-+ transition_latency = CPUFREQ_ETERNAL;
-+
-+ cache = of_find_next_cache_node(np);
-+ if (cache) {
-+ struct device_node *vdd;
-+
-+ vdd = of_parse_phandle(cache, "vdd_dig-supply", 0);
-+ if (vdd) {
-+ krait_l2_reg = regulator_get(NULL, vdd->name);
-+ if (IS_ERR(krait_l2_reg)) {
-+ pr_warn("failed to get l2 vdd_dig supply\n");
-+ krait_l2_reg = NULL;
-+ }
-+ of_node_put(vdd);
-+ }
-+
-+ krait_l2_clk = of_clk_get(cache, 0);
-+ if (!IS_ERR(krait_l2_clk)) {
-+ ret = krait_parse_cache_points(&pdev->dev, cache);
-+ if (ret)
-+ clk_put(krait_l2_clk);
-+ }
-+ if (IS_ERR(krait_l2_clk) || ret)
-+ krait_l2_clk = NULL;
-+ }
-+
-+ for_each_possible_cpu(cpu) {
-+ dev = get_cpu_device(cpu);
-+ if (!dev) {
-+ pr_err("failed to get krait device\n");
-+ ret = -ENOENT;
-+ goto out_free_table;
-+ }
-+ per_cpu(krait_cpu_clks, cpu) = clk = devm_clk_get(dev, NULL);
-+ if (IS_ERR(clk)) {
-+ ret = PTR_ERR(clk);
-+ goto out_free_table;
-+ }
-+ core = devm_regulator_get(dev, "core");
-+ if (IS_ERR(core)) {
-+ pr_debug("failed to get core regulator\n");
-+ ret = PTR_ERR(core);
-+ goto out_free_table;
-+ }
-+ per_cpu(krait_supply_core, cpu) = core;
-+
-+ freq = freq_Hz = clk_get_rate(clk);
-+
-+ rcu_read_lock();
-+ opp = dev_pm_opp_find_freq_ceil(cpu_dev, &freq_Hz);
-+ if (IS_ERR(opp)) {
-+ rcu_read_unlock();
-+ pr_err("failed to find OPP for %ld\n", freq_Hz);
-+ ret = PTR_ERR(opp);
-+ goto out_free_table;
-+ }
-+ volt = dev_pm_opp_get_voltage(opp);
-+ rcu_read_unlock();
-+
-+ tol = volt * voltage_tolerance / 100;
-+ ret = regulator_set_voltage_tol(core, volt, tol);
-+ if (ret) {
-+ pr_err("failed to scale voltage up: %d\n", ret);
-+ goto out_free_table;
-+ }
-+ ret = regulator_enable(core);
-+ if (ret) {
-+ pr_err("failed to enable regulator: %d\n", ret);
-+ goto out_free_table;
-+ }
-+ max_cpu_freq = max(max_cpu_freq, freq);
-+ }
-+
-+ for (i = 0; i < nr_krait_l2_points; i++) {
-+ if (max_cpu_freq >= krait_l2_points[i].cpu_freq) {
-+ if (krait_l2_reg) {
-+ ret = regulator_set_voltage_tol(krait_l2_reg,
-+ krait_l2_points[i].cache_volt,
-+ tol);
-+ if (ret)
-+ pr_err("failed to scale l2 voltage: %d\n",
-+ ret);
-+ ret = regulator_enable(krait_l2_reg);
-+ if (ret)
-+ pr_err("failed to enable l2 voltage: %d\n",
-+ ret);
-+ }
-+ break;
-+ }
-+
-+ }
-+
-+ ret = cpufreq_register_driver(&krait_cpufreq_driver);
-+ if (ret) {
-+ pr_err("failed register driver: %d\n", ret);
-+ goto out_free_table;
-+ }
-+ of_node_put(np);
-+
-+ /*
-+ * For now, just loading the cooling device;
-+ * thermal DT code takes care of matching them.
-+ */
-+ for_each_possible_cpu(cpu) {
-+ dev = get_cpu_device(cpu);
-+ np = of_node_get(dev->of_node);
-+ if (of_find_property(np, "#cooling-cells", NULL)) {
-+ cdev = of_cpufreq_cooling_register(np, cpumask_of(cpu));
-+ if (IS_ERR(cdev))
-+ pr_err("running cpufreq without cooling device: %ld\n",
-+ PTR_ERR(cdev));
-+ }
-+ of_node_put(np);
-+ }
-+
-+ return 0;
-+
-+out_free_table:
-+ regulator_put(krait_l2_reg);
-+ clk_put(krait_l2_clk);
-+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
-+out_put_node:
-+ of_node_put(np);
-+ return ret;
-+}
-+
-+static int krait_cpufreq_remove(struct platform_device *pdev)
-+{
-+ cpufreq_cooling_unregister(cdev);
-+ cpufreq_unregister_driver(&krait_cpufreq_driver);
-+ dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table);
-+ clk_put(krait_l2_clk);
-+ regulator_put(krait_l2_reg);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver krait_cpufreq_platdrv = {
-+ .driver = {
-+ .name = "cpufreq-krait",
-+ .owner = THIS_MODULE,
-+ },
-+ .probe = krait_cpufreq_probe,
-+ .remove = krait_cpufreq_remove,
-+};
-+module_platform_driver(krait_cpufreq_platdrv);
-+
-+MODULE_DESCRIPTION("Krait CPUfreq driver");
-+MODULE_LICENSE("GPL v2");
---- a/drivers/cpufreq/qcom-cpufreq.c
-+++ b/drivers/cpufreq/qcom-cpufreq.c
-@@ -168,11 +168,8 @@ static int __init qcom_cpufreq_populate_
-
- static int __init qcom_cpufreq_driver_init(void)
- {
-- struct cpufreq_dt_platform_data pdata = { .independent_clocks = true };
- struct platform_device_info devinfo = {
-- .name = "cpufreq-dt",
-- .data = &pdata,
-- .size_data = sizeof(pdata),
-+ .name = "cpufreq-krait",
- };
- struct device *cpu_dev;
- struct device_node *np;
projects / openwrt / staging / lynxis / omap.git / blobdiff