mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-13 14:14:37 +00:00
de6cc6515a
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 675 mass ave cambridge ma 02139 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 77 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Armijn Hemel <armijn@tjaldur.nl> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.837555891@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
128 lines
2.6 KiB
C
128 lines
2.6 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 <asm/processor.h>
|
|
#include <asm/prom.h>
|
|
#include <asm/pmi.h>
|
|
#include <asm/cell-regs.h>
|
|
|
|
#ifdef DEBUG
|
|
#include <asm/time.h>
|
|
#endif
|
|
|
|
#include "ppc_cbe_cpufreq.h"
|
|
|
|
static u8 pmi_slow_mode_limit[MAX_CBE];
|
|
|
|
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)
|
|
{
|
|
u8 node, slow_mode;
|
|
|
|
BUG_ON(pmi_msg.type != PMI_TYPE_FREQ_CHANGE);
|
|
|
|
node = pmi_msg.data1;
|
|
slow_mode = pmi_msg.data2;
|
|
|
|
pmi_slow_mode_limit[node] = slow_mode;
|
|
|
|
pr_debug("cbe_handle_pmi: node: %d max_freq: %d\n", node, slow_mode);
|
|
}
|
|
|
|
static int pmi_notifier(struct notifier_block *nb,
|
|
unsigned long event, void *data)
|
|
{
|
|
struct cpufreq_policy *policy = data;
|
|
struct cpufreq_frequency_table *cbe_freqs = policy->freq_table;
|
|
u8 node;
|
|
|
|
/* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY
|
|
* policy events?)
|
|
*/
|
|
node = cbe_cpu_to_node(policy->cpu);
|
|
|
|
pr_debug("got notified, event=%lu, node=%u\n", event, node);
|
|
|
|
if (pmi_slow_mode_limit[node] != 0) {
|
|
pr_debug("limiting node %d to slow mode %d\n",
|
|
node, pmi_slow_mode_limit[node]);
|
|
|
|
cpufreq_verify_within_limits(policy, 0,
|
|
|
|
cbe_freqs[pmi_slow_mode_limit[node]].frequency);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block pmi_notifier_block = {
|
|
.notifier_call = pmi_notifier,
|
|
};
|
|
|
|
static struct pmi_handler cbe_pmi_handler = {
|
|
.type = PMI_TYPE_FREQ_CHANGE,
|
|
.handle_pmi_message = cbe_cpufreq_handle_pmi,
|
|
};
|
|
|
|
|
|
|
|
static int __init cbe_cpufreq_pmi_init(void)
|
|
{
|
|
cbe_cpufreq_has_pmi = pmi_register_handler(&cbe_pmi_handler) == 0;
|
|
|
|
if (!cbe_cpufreq_has_pmi)
|
|
return -ENODEV;
|
|
|
|
cpufreq_register_notifier(&pmi_notifier_block, CPUFREQ_POLICY_NOTIFIER);
|
|
|
|
return 0;
|
|
}
|
|
device_initcall(cbe_cpufreq_pmi_init);
|