diff options
Diffstat (limited to 'drivers/cpufreq/arm_big_little_dt.c')
| -rw-r--r-- | drivers/cpufreq/arm_big_little_dt.c | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/drivers/cpufreq/arm_big_little_dt.c b/drivers/cpufreq/arm_big_little_dt.c deleted file mode 100644 index fd9e3ea6a480..000000000000 --- a/drivers/cpufreq/arm_big_little_dt.c +++ /dev/null @@ -1,129 +0,0 @@ -/* - * 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/cpu.h> -#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/platform_device.h> -#include <linux/slab.h> -#include <linux/types.h> -#include "arm_big_little.h" - -/* get cpu node with valid operating-points */ -static struct device_node *get_cpu_node_with_valid_op(int cpu) -{ - struct device_node *np = NULL, *parent; - int count = 0; - - parent = of_find_node_by_path("/cpus"); - if (!parent) { - pr_err("failed to find OF /cpus\n"); - return NULL; - } - - for_each_child_of_node(parent, np) { - if (count++ != cpu) - continue; - if (!of_get_property(np, "operating-points", NULL)) { - of_node_put(np); - np = NULL; - } - - break; - } - - of_node_put(parent); - return np; -} - -static int dt_init_opp_table(struct device *cpu_dev) -{ - struct device_node *np; - int ret; - - np = get_cpu_node_with_valid_op(cpu_dev->id); - if (!np) - return -ENODATA; - - cpu_dev->of_node = np; - ret = of_init_opp_table(cpu_dev); - of_node_put(np); - - return ret; -} - -static int dt_get_transition_latency(struct device *cpu_dev) -{ - struct device_node *np; - u32 transition_latency = CPUFREQ_ETERNAL; - - np = get_cpu_node_with_valid_op(cpu_dev->id); - if (!np) - return CPUFREQ_ETERNAL; - - of_property_read_u32(np, "clock-latency", &transition_latency); - of_node_put(np); - - pr_debug("%s: clock-latency: %d\n", __func__, transition_latency); - return transition_latency; -} - -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_probe(struct platform_device *pdev) -{ - struct device_node *np; - - np = get_cpu_node_with_valid_op(0); - if (!np) - return -ENODEV; - - of_node_put(np); - return bL_cpufreq_register(&dt_bL_ops); -} - -static int generic_bL_remove(struct platform_device *pdev) -{ - bL_cpufreq_unregister(&dt_bL_ops); - return 0; -} - -static struct platform_driver generic_bL_platdrv = { - .driver = { - .name = "arm-bL-cpufreq-dt", - .owner = THIS_MODULE, - }, - .probe = generic_bL_probe, - .remove = generic_bL_remove, -}; -module_platform_driver(generic_bL_platdrv); - -MODULE_AUTHOR("Viresh Kumar <viresh.kumar@linaro.org>"); -MODULE_DESCRIPTION("Generic ARM big LITTLE cpufreq driver via DT"); -MODULE_LICENSE("GPL"); |