![Paul Gortmaker](/assets/img/avatar_default.png)
The Kconfig for this driver is currently: config CPU_FREQ_CBE_PMI bool "CBE frequency scaling using PMI interface" ...meaning that it currently is not being built as a module by anyone. Lets remove the modular and unused code here, so that when reading the driver there is no doubt it is builtin-only. Since module_init translates to device_initcall in the non-modular case, the init ordering remains unchanged with this commit. We also delete the MODULE_LICENSE tag etc. since all that information is already contained at the top of the file in the comments. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> [ rjw: Changelog ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
/*
|
|
* pmi backend for the cbe_cpufreq driver
|
|
*
|
|
* (C) Copyright IBM Deutschland Entwicklung GmbH 2005-2007
|
|
*
|
|
* Author: Christian Krafft <krafft@de.ibm.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#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;
|
|
u8 node;
|
|
|
|
/* Should this really be called for CPUFREQ_ADJUST and CPUFREQ_NOTIFY
|
|
* policy events?)
|
|
*/
|
|
if (event == CPUFREQ_START)
|
|
return 0;
|
|
|
|
cbe_freqs = cpufreq_frequency_get_table(policy->cpu);
|
|
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);
|