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Diffstat (limited to 'arch/mips/kernel/cpufreq/loongson2_cpufreq.c')
-rw-r--r--arch/mips/kernel/cpufreq/loongson2_cpufreq.c255
1 files changed, 0 insertions, 255 deletions
diff --git a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c b/arch/mips/kernel/cpufreq/loongson2_cpufreq.c
deleted file mode 100644
index 3237c5235f9..00000000000
--- a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c
+++ /dev/null
@@ -1,255 +0,0 @@
-/*
- * Cpufreq driver for the loongson-2 processors
- *
- * The 2E revision of loongson processor not support this feature.
- *
- * Copyright (C) 2006 - 2008 Lemote Inc. & Insititute of Computing Technology
- * Author: Yanhua, yanh@lemote.com
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- */
-#include <linux/cpufreq.h>
-#include <linux/module.h>
-#include <linux/err.h>
-#include <linux/sched.h> /* set_cpus_allowed() */
-#include <linux/delay.h>
-#include <linux/platform_device.h>
-
-#include <asm/clock.h>
-
-#include <asm/mach-loongson/loongson.h>
-
-static uint nowait;
-
-static struct clk *cpuclk;
-
-static void (*saved_cpu_wait) (void);
-
-static int loongson2_cpu_freq_notifier(struct notifier_block *nb,
- unsigned long val, void *data);
-
-static struct notifier_block loongson2_cpufreq_notifier_block = {
- .notifier_call = loongson2_cpu_freq_notifier
-};
-
-static int loongson2_cpu_freq_notifier(struct notifier_block *nb,
- unsigned long val, void *data)
-{
- if (val == CPUFREQ_POSTCHANGE)
- current_cpu_data.udelay_val = loops_per_jiffy;
-
- return 0;
-}
-
-static unsigned int loongson2_cpufreq_get(unsigned int cpu)
-{
- return clk_get_rate(cpuclk);
-}
-
-/*
- * Here we notify other drivers of the proposed change and the final change.
- */
-static int loongson2_cpufreq_target(struct cpufreq_policy *policy,
- unsigned int target_freq,
- unsigned int relation)
-{
- unsigned int cpu = policy->cpu;
- unsigned int newstate = 0;
- cpumask_t cpus_allowed;
- struct cpufreq_freqs freqs;
- unsigned int freq;
-
- if (!cpu_online(cpu))
- return -ENODEV;
-
- cpus_allowed = current->cpus_allowed;
- set_cpus_allowed_ptr(current, cpumask_of(cpu));
-
- if (cpufreq_frequency_table_target
- (policy, &loongson2_clockmod_table[0], target_freq, relation,
- &newstate))
- return -EINVAL;
-
- freq =
- ((cpu_clock_freq / 1000) *
- loongson2_clockmod_table[newstate].index) / 8;
- if (freq < policy->min || freq > policy->max)
- return -EINVAL;
-
- pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000);
-
- freqs.cpu = cpu;
- freqs.old = loongson2_cpufreq_get(cpu);
- freqs.new = freq;
- freqs.flags = 0;
-
- if (freqs.new == freqs.old)
- return 0;
-
- /* notifiers */
- cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
-
- set_cpus_allowed_ptr(current, &cpus_allowed);
-
- /* setting the cpu frequency */
- clk_set_rate(cpuclk, freq);
-
- /* notifiers */
- cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
-
- pr_debug("cpufreq: set frequency %u kHz\n", freq);
-
- return 0;
-}
-
-static int loongson2_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
- int i;
- unsigned long rate;
- int ret;
-
- if (!cpu_online(policy->cpu))
- return -ENODEV;
-
- cpuclk = clk_get(NULL, "cpu_clk");
- if (IS_ERR(cpuclk)) {
- printk(KERN_ERR "cpufreq: couldn't get CPU clk\n");
- return PTR_ERR(cpuclk);
- }
-
- rate = cpu_clock_freq / 1000;
- if (!rate) {
- clk_put(cpuclk);
- return -EINVAL;
- }
- ret = clk_set_rate(cpuclk, rate);
- if (ret) {
- clk_put(cpuclk);
- return ret;
- }
-
- /* clock table init */
- for (i = 2;
- (loongson2_clockmod_table[i].frequency != CPUFREQ_TABLE_END);
- i++)
- loongson2_clockmod_table[i].frequency = (rate * i) / 8;
-
- policy->cur = loongson2_cpufreq_get(policy->cpu);
-
- cpufreq_frequency_table_get_attr(&loongson2_clockmod_table[0],
- policy->cpu);
-
- return cpufreq_frequency_table_cpuinfo(policy,
- &loongson2_clockmod_table[0]);
-}
-
-static int loongson2_cpufreq_verify(struct cpufreq_policy *policy)
-{
- return cpufreq_frequency_table_verify(policy,
- &loongson2_clockmod_table[0]);
-}
-
-static int loongson2_cpufreq_exit(struct cpufreq_policy *policy)
-{
- clk_put(cpuclk);
- return 0;
-}
-
-static struct freq_attr *loongson2_table_attr[] = {
- &cpufreq_freq_attr_scaling_available_freqs,
- NULL,
-};
-
-static struct cpufreq_driver loongson2_cpufreq_driver = {
- .owner = THIS_MODULE,
- .name = "loongson2",
- .init = loongson2_cpufreq_cpu_init,
- .verify = loongson2_cpufreq_verify,
- .target = loongson2_cpufreq_target,
- .get = loongson2_cpufreq_get,
- .exit = loongson2_cpufreq_exit,
- .attr = loongson2_table_attr,
-};
-
-static struct platform_device_id platform_device_ids[] = {
- {
- .name = "loongson2_cpufreq",
- },
- {}
-};
-
-MODULE_DEVICE_TABLE(platform, platform_device_ids);
-
-static struct platform_driver platform_driver = {
- .driver = {
- .name = "loongson2_cpufreq",
- .owner = THIS_MODULE,
- },
- .id_table = platform_device_ids,
-};
-
-/*
- * This is the simple version of Loongson-2 wait, Maybe we need do this in
- * interrupt disabled context.
- */
-
-static DEFINE_SPINLOCK(loongson2_wait_lock);
-
-static void loongson2_cpu_wait(void)
-{
- unsigned long flags;
- u32 cpu_freq;
-
- spin_lock_irqsave(&loongson2_wait_lock, flags);
- cpu_freq = LOONGSON_CHIPCFG0;
- LOONGSON_CHIPCFG0 &= ~0x7; /* Put CPU into wait mode */
- LOONGSON_CHIPCFG0 = cpu_freq; /* Restore CPU state */
- spin_unlock_irqrestore(&loongson2_wait_lock, flags);
-}
-
-static int __init cpufreq_init(void)
-{
- int ret;
-
- /* Register platform stuff */
- ret = platform_driver_register(&platform_driver);
- if (ret)
- return ret;
-
- pr_info("cpufreq: Loongson-2F CPU frequency driver.\n");
-
- cpufreq_register_notifier(&loongson2_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
-
- ret = cpufreq_register_driver(&loongson2_cpufreq_driver);
-
- if (!ret && !nowait) {
- saved_cpu_wait = cpu_wait;
- cpu_wait = loongson2_cpu_wait;
- }
-
- return ret;
-}
-
-static void __exit cpufreq_exit(void)
-{
- if (!nowait && saved_cpu_wait)
- cpu_wait = saved_cpu_wait;
- cpufreq_unregister_driver(&loongson2_cpufreq_driver);
- cpufreq_unregister_notifier(&loongson2_cpufreq_notifier_block,
- CPUFREQ_TRANSITION_NOTIFIER);
-
- platform_driver_unregister(&platform_driver);
-}
-
-module_init(cpufreq_init);
-module_exit(cpufreq_exit);
-
-module_param(nowait, uint, 0644);
-MODULE_PARM_DESC(nowait, "Disable Loongson-2F specific wait");
-
-MODULE_AUTHOR("Yanhua <yanh@lemote.com>");
-MODULE_DESCRIPTION("cpufreq driver for Loongson2F");
-MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-26 09:57:48 +0000