diff options
Diffstat (limited to 'target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch')
| -rw-r--r-- | target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch | 255 |
1 files changed, 255 insertions, 0 deletions
diff --git a/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch b/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch new file mode 100644 index 0000000000..3150a4dfb8 --- /dev/null +++ b/target/linux/ipq806x/patches/0172-cpufreq-Add-a-cpufreq-krait-based-on-cpufreq-cpu0.patch @@ -0,0 +1,255 @@ +From 5cf343c60d7557aefb468603065cac5062f11b8d Mon Sep 17 00:00:00 2001 +From: Stephen Boyd <sboyd@codeaurora.org> +Date: Fri, 30 May 2014 16:36:11 -0700 +Subject: [PATCH 172/182] 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 + +diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig +index 4b029c0..4051528 100644 +--- a/drivers/cpufreq/Kconfig ++++ b/drivers/cpufreq/Kconfig +@@ -194,6 +194,19 @@ config GENERIC_CPUFREQ_CPU0 + + 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" +diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile +index 7494565..f6f4485 100644 +--- a/drivers/cpufreq/Makefile ++++ b/drivers/cpufreq/Makefile +@@ -12,6 +12,7 @@ obj-$(CONFIG_CPU_FREQ_GOV_CONSERVATIVE) += cpufreq_conservative.o + obj-$(CONFIG_CPU_FREQ_GOV_COMMON) += cpufreq_governor.o + + obj-$(CONFIG_GENERIC_CPUFREQ_CPU0) += cpufreq-cpu0.o ++obj-$(CONFIG_GENERIC_CPUFREQ_KRAIT) += cpufreq-krait.o + + ################################################################################## + # x86 drivers. +diff --git a/drivers/cpufreq/cpufreq-krait.c b/drivers/cpufreq/cpufreq-krait.c +new file mode 100644 +index 0000000..7b38b9c +--- /dev/null ++++ b/drivers/cpufreq/cpufreq-krait.c +@@ -0,0 +1,190 @@ ++/* ++ * 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/slab.h> ++#include <linux/thermal.h> ++ ++static unsigned int transition_latency; ++ ++static struct device *cpu_dev; ++static DEFINE_PER_CPU(struct clk *, krait_cpu_clks); ++static struct cpufreq_frequency_table *freq_table; ++static struct thermal_cooling_device *cdev; ++ ++static int krait_set_target(struct cpufreq_policy *policy, unsigned int index) ++{ ++ unsigned long volt = 0, volt_old = 0; ++ unsigned int old_freq, new_freq; ++ long freq_Hz, freq_exact; ++ int ret; ++ struct clk *cpu_clk; ++ ++ 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; ++ ++ 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); ++ ++ ret = clk_set_rate(cpu_clk, freq_exact); ++ if (ret) ++ pr_err("failed to set clock rate: %d\n", ret); ++ ++ 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; ++ int ret; ++ unsigned int cpu; ++ struct device *dev; ++ struct clk *clk; ++ ++ 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; ++ } ++ ++ for_each_possible_cpu(cpu) { ++ dev = get_cpu_device(cpu); ++ if (!dev) { ++ pr_err("failed to get krait device\n"); ++ ret = -ENOENT; ++ goto out_put_node; ++ } ++ per_cpu(krait_cpu_clks, cpu) = clk = devm_clk_get(dev, NULL); ++ if (IS_ERR(clk)) { ++ ret = PTR_ERR(clk); ++ goto out_put_node; ++ } ++ } ++ ++ ret = of_init_opp_table(cpu_dev); ++ if (ret) { ++ pr_err("failed to init OPP table: %d\n", ret); ++ goto out_put_node; ++ } ++ ++ 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; ++ } ++ ++ if (of_property_read_u32(np, "clock-latency", &transition_latency)) ++ transition_latency = CPUFREQ_ETERNAL; ++ ++ 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: ++ 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); ++ ++ 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"); +-- +1.7.10.4 + |