mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 10:49:33 +00:00
![Christophe Leroy](/assets/img/avatar_default.png)
powerpc's asm/prom.h brings some headers that it doesn't need itself. In order to clean it up, first add missing headers in users of asm/prom.h Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
151 lines
3.1 KiB
C
151 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* pmi backend for the cbe_cpufreq driver
|
|
*
|
|
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
|
|
*
|
|
* Author: Christian Krafft <krafft@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/pm_qos.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/processor.h>
|
|
#include <asm/pmi.h>
|
|
#include <asm/cell-regs.h>
|
|
|
|
#ifdef DEBUG
|
|
#include <asm/time.h>
|
|
#endif
|
|
|
|
#include "ppc_cbe_cpufreq.h"
|
|
|
|
bool cbe_cpufreq_has_pmi = false;
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_has_pmi);
|
|
|
|
/*
|
|
* hardware specific functions
|
|
*/
|
|
|
|
int cbe_cpufreq_set_pmode_pmi(int cpu, unsigned int pmode)
|
|
{
|
|
int ret;
|
|
pmi_message_t pmi_msg;
|
|
#ifdef DEBUG
|
|
long time;
|
|
#endif
|
|
pmi_msg.type = PMI_TYPE_FREQ_CHANGE;
|
|
pmi_msg.data1 = cbe_cpu_to_node(cpu);
|
|
pmi_msg.data2 = pmode;
|
|
|
|
#ifdef DEBUG
|
|
time = jiffies;
|
|
#endif
|
|
pmi_send_message(pmi_msg);
|
|
|
|
#ifdef DEBUG
|
|
time = jiffies - time;
|
|
time = jiffies_to_msecs(time);
|
|
pr_debug("had to wait %lu ms for a transition using " \
|
|
"PMI\n", time);
|
|
#endif
|
|
ret = pmi_msg.data2;
|
|
pr_debug("PMI returned slow mode %d\n", ret);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_set_pmode_pmi);
|
|
|
|
|
|
static void cbe_cpufreq_handle_pmi(pmi_message_t pmi_msg)
|
|
{
|
|
struct cpufreq_policy *policy;
|
|
struct freq_qos_request *req;
|
|
u8 node, slow_mode;
|
|
int cpu, ret;
|
|
|
|
BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
|
|
|
|
node = pmi_msg.data1;
|
|
slow_mode = pmi_msg.data2;
|
|
|
|
cpu = cbe_node_to_cpu(node);
|
|
|
|
pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
|
|
|
|
policy = cpufreq_cpu_get(cpu);
|
|
if (!policy) {
|
|
pr_warn("cpufreq policy not found cpu%d\n", cpu);
|
|
return;
|
|
}
|
|
|
|
req = policy->driver_data;
|
|
|
|
ret = freq_qos_update_request(req,
|
|
policy->freq_table[slow_mode].frequency);
|
|
if (ret < 0)
|
|
pr_warn("Failed to update freq constraint: %d\n", ret);
|
|
else
|
|
pr_debug("limiting node %d to slow mode %d\n", node, slow_mode);
|
|
|
|
cpufreq_cpu_put(policy);
|
|
}
|
|
|
|
static struct pmi_handler cbe_pmi_handler = {
|
|
.type = PMI_TYPE_FREQ_CHANGE,
|
|
.handle_pmi_message = cbe_cpufreq_handle_pmi,
|
|
};
|
|
|
|
void cbe_cpufreq_pmi_policy_init(struct cpufreq_policy *policy)
|
|
{
|
|
struct freq_qos_request *req;
|
|
int ret;
|
|
|
|
if (!cbe_cpufreq_has_pmi)
|
|
return;
|
|
|
|
req = kzalloc(sizeof(*req), GFP_KERNEL);
|
|
if (!req)
|
|
return;
|
|
|
|
ret = freq_qos_add_request(&policy->constraints, req, FREQ_QOS_MAX,
|
|
policy->freq_table[0].frequency);
|
|
if (ret < 0) {
|
|
pr_err("Failed to add freq constraint (%d)\n", ret);
|
|
kfree(req);
|
|
return;
|
|
}
|
|
|
|
policy->driver_data = req;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_init);
|
|
|
|
void cbe_cpufreq_pmi_policy_exit(struct cpufreq_policy *policy)
|
|
{
|
|
struct freq_qos_request *req = policy->driver_data;
|
|
|
|
if (cbe_cpufreq_has_pmi) {
|
|
freq_qos_remove_request(req);
|
|
kfree(req);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_policy_exit);
|
|
|
|
void cbe_cpufreq_pmi_init(void)
|
|
{
|
|
if (!pmi_register_handler(&cbe_pmi_handler))
|
|
cbe_cpufreq_has_pmi = true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_init);
|
|
|
|
void cbe_cpufreq_pmi_exit(void)
|
|
{
|
|
pmi_unregister_handler(&cbe_pmi_handler);
|
|
cbe_cpufreq_has_pmi = false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(cbe_cpufreq_pmi_exit);
|