162 lines
4.4 KiB
C
162 lines
4.4 KiB
C
/*
|
|
* File: arch/blackfin/mach-bf527/cpu.c
|
|
* Based on: arch/blackfin/mach-bf537/cpu.c
|
|
* Author: michael.kang@analog.com
|
|
*
|
|
* Created:
|
|
* Description: clock scaling for the bf527
|
|
*
|
|
* Modified:
|
|
* Copyright 2004-2007 Analog Devices Inc.
|
|
*
|
|
* Bugs: Enter bugs at http://blackfin.uclinux.org/
|
|
*
|
|
* 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 of the License, 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, see the file COPYING, or write
|
|
* to the Free Software Foundation, Inc.,
|
|
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/init.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <asm/dpmc.h>
|
|
#include <linux/fs.h>
|
|
#include <asm/bfin-global.h>
|
|
|
|
/* CONFIG_CLKIN_HZ=11059200 */
|
|
#define VCO5 (CONFIG_CLKIN_HZ*45) /*497664000 */
|
|
#define VCO4 (CONFIG_CLKIN_HZ*36) /*398131200 */
|
|
#define VCO3 (CONFIG_CLKIN_HZ*27) /*298598400 */
|
|
#define VCO2 (CONFIG_CLKIN_HZ*18) /*199065600 */
|
|
#define VCO1 (CONFIG_CLKIN_HZ*9) /*99532800 */
|
|
#define VCO(x) VCO##x
|
|
|
|
#define MFREQ(x) {VCO(x), VCO(x)/4}, {VCO(x), VCO(x)/2}, {VCO(x), VCO(x)}
|
|
/* frequency */
|
|
static struct cpufreq_frequency_table bf527_freq_table[] = {
|
|
MFREQ(1),
|
|
MFREQ(3),
|
|
{VCO4, VCO4 / 2}, {VCO4, VCO4},
|
|
MFREQ(5),
|
|
{0, CPUFREQ_TABLE_END},
|
|
};
|
|
|
|
/*
|
|
* dpmc_fops->ioctl()
|
|
* static int dpmc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
|
|
*/
|
|
static int bf527_getfreq(unsigned int cpu)
|
|
{
|
|
unsigned long cclk_mhz;
|
|
|
|
/* The driver only support single cpu */
|
|
if (cpu == 0)
|
|
dpmc_fops.ioctl(NULL, NULL, IOCTL_GET_CORECLOCK, &cclk_mhz);
|
|
else
|
|
cclk_mhz = -1;
|
|
|
|
return cclk_mhz;
|
|
}
|
|
|
|
static int bf527_target(struct cpufreq_policy *policy,
|
|
unsigned int target_freq, unsigned int relation)
|
|
{
|
|
unsigned long cclk_mhz;
|
|
unsigned long vco_mhz;
|
|
unsigned long flags;
|
|
unsigned int index;
|
|
struct cpufreq_freqs freqs;
|
|
|
|
if (cpufreq_frequency_table_target
|
|
(policy, bf527_freq_table, target_freq, relation, &index))
|
|
return -EINVAL;
|
|
|
|
cclk_mhz = bf527_freq_table[index].frequency;
|
|
vco_mhz = bf527_freq_table[index].index;
|
|
|
|
dpmc_fops.ioctl(NULL, NULL, IOCTL_CHANGE_FREQUENCY, &vco_mhz);
|
|
freqs.old = bf527_getfreq(0);
|
|
freqs.new = cclk_mhz;
|
|
freqs.cpu = 0;
|
|
|
|
pr_debug
|
|
("cclk begin change to cclk %d,vco=%d,index=%d,target=%d,oldfreq=%d\n",
|
|
cclk_mhz, vco_mhz, index, target_freq, freqs.old);
|
|
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
|
|
local_irq_save(flags);
|
|
dpmc_fops.ioctl(NULL, NULL, IOCTL_SET_CCLK, &cclk_mhz);
|
|
local_irq_restore(flags);
|
|
cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
|
|
|
|
vco_mhz = get_vco();
|
|
cclk_mhz = get_cclk();
|
|
return 0;
|
|
}
|
|
|
|
/* make sure that only the "userspace" governor is run -- anything else wouldn't make sense on
|
|
* this platform, anyway.
|
|
*/
|
|
static int bf527_verify_speed(struct cpufreq_policy *policy)
|
|
{
|
|
return cpufreq_frequency_table_verify(policy, &bf527_freq_table);
|
|
}
|
|
|
|
static int __init __bf527_cpu_init(struct cpufreq_policy *policy)
|
|
{
|
|
if (policy->cpu != 0)
|
|
return -EINVAL;
|
|
|
|
policy->governor = CPUFREQ_DEFAULT_GOVERNOR;
|
|
|
|
policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
|
|
/*Now ,only support one cpu */
|
|
policy->cur = bf527_getfreq(0);
|
|
cpufreq_frequency_table_get_attr(bf527_freq_table, policy->cpu);
|
|
return cpufreq_frequency_table_cpuinfo(policy, bf527_freq_table);
|
|
}
|
|
|
|
static struct freq_attr *bf527_freq_attr[] = {
|
|
&cpufreq_freq_attr_scaling_available_freqs,
|
|
NULL,
|
|
};
|
|
|
|
static struct cpufreq_driver bf527_driver = {
|
|
.verify = bf527_verify_speed,
|
|
.target = bf527_target,
|
|
.get = bf527_getfreq,
|
|
.init = __bf527_cpu_init,
|
|
.name = "bf527",
|
|
.owner = THIS_MODULE,
|
|
.attr = bf527_freq_attr,
|
|
};
|
|
|
|
static int __init bf527_cpu_init(void)
|
|
{
|
|
return cpufreq_register_driver(&bf527_driver);
|
|
}
|
|
|
|
static void __exit bf527_cpu_exit(void)
|
|
{
|
|
cpufreq_unregister_driver(&bf527_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Mickael Kang");
|
|
MODULE_DESCRIPTION("cpufreq driver for bf527 CPU");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
module_init(bf527_cpu_init);
|
|
module_exit(bf527_cpu_exit);
|