mirror of
https://github.com/torvalds/linux.git
synced 2024-12-25 04:11:49 +00:00
dd6f01b5cc
This patch moves S3C2440 stuff into mach-s3c24xx/ directory so that we can merge the s3c24 series' directories to the just one mach-s3c24xx/ directory. And this patch is including following. - re-ordered alphabetically by option text at Kconfig and Makefile Cc: Ben Dooks <ben-linux@fluff.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
195 lines
4.2 KiB
C
195 lines
4.2 KiB
C
/* linux/arch/arm/mach-s3c2440/mach-osiris-dvs.c
|
|
*
|
|
* Copyright (c) 2009 Simtec Electronics
|
|
* http://armlinux.simtec.co.uk/
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* Simtec Osiris Dynamic Voltage Scaling support.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/cpufreq.h>
|
|
#include <linux/gpio.h>
|
|
|
|
#include <linux/i2c/tps65010.h>
|
|
|
|
#include <plat/cpu-freq.h>
|
|
|
|
#define OSIRIS_GPIO_DVS S3C2410_GPB(5)
|
|
|
|
static bool dvs_en;
|
|
|
|
static void osiris_dvs_tps_setdvs(bool on)
|
|
{
|
|
unsigned vregs1 = 0, vdcdc2 = 0;
|
|
|
|
if (!on) {
|
|
vdcdc2 = TPS_VCORE_DISCH | TPS_LP_COREOFF;
|
|
vregs1 = TPS_LDO1_OFF; /* turn off in low-power mode */
|
|
}
|
|
|
|
dvs_en = on;
|
|
vdcdc2 |= TPS_VCORE_1_3V | TPS_VCORE_LP_1_0V;
|
|
vregs1 |= TPS_LDO2_ENABLE | TPS_LDO1_ENABLE;
|
|
|
|
tps65010_config_vregs1(vregs1);
|
|
tps65010_config_vdcdc2(vdcdc2);
|
|
}
|
|
|
|
static bool is_dvs(struct s3c_freq *f)
|
|
{
|
|
/* at the moment, we assume ARMCLK = HCLK => DVS */
|
|
return f->armclk == f->hclk;
|
|
}
|
|
|
|
/* keep track of current state */
|
|
static bool cur_dvs = false;
|
|
|
|
static int osiris_dvs_notify(struct notifier_block *nb,
|
|
unsigned long val, void *data)
|
|
{
|
|
struct cpufreq_freqs *cf = data;
|
|
struct s3c_cpufreq_freqs *freqs = to_s3c_cpufreq(cf);
|
|
bool old_dvs = is_dvs(&freqs->old);
|
|
bool new_dvs = is_dvs(&freqs->new);
|
|
int ret = 0;
|
|
|
|
if (!dvs_en)
|
|
return 0;
|
|
|
|
printk(KERN_DEBUG "%s: old %ld,%ld new %ld,%ld\n", __func__,
|
|
freqs->old.armclk, freqs->old.hclk,
|
|
freqs->new.armclk, freqs->new.hclk);
|
|
|
|
switch (val) {
|
|
case CPUFREQ_PRECHANGE:
|
|
if (old_dvs & !new_dvs ||
|
|
cur_dvs & !new_dvs) {
|
|
pr_debug("%s: exiting dvs\n", __func__);
|
|
cur_dvs = false;
|
|
gpio_set_value(OSIRIS_GPIO_DVS, 1);
|
|
}
|
|
break;
|
|
case CPUFREQ_POSTCHANGE:
|
|
if (!old_dvs & new_dvs ||
|
|
!cur_dvs & new_dvs) {
|
|
pr_debug("entering dvs\n");
|
|
cur_dvs = true;
|
|
gpio_set_value(OSIRIS_GPIO_DVS, 0);
|
|
}
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct notifier_block osiris_dvs_nb = {
|
|
.notifier_call = osiris_dvs_notify,
|
|
};
|
|
|
|
static int __devinit osiris_dvs_probe(struct platform_device *pdev)
|
|
{
|
|
int ret;
|
|
|
|
dev_info(&pdev->dev, "initialising\n");
|
|
|
|
ret = gpio_request(OSIRIS_GPIO_DVS, "osiris-dvs");
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "cannot claim gpio\n");
|
|
goto err_nogpio;
|
|
}
|
|
|
|
/* start with dvs disabled */
|
|
gpio_direction_output(OSIRIS_GPIO_DVS, 1);
|
|
|
|
ret = cpufreq_register_notifier(&osiris_dvs_nb,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
if (ret) {
|
|
dev_err(&pdev->dev, "failed to register with cpufreq\n");
|
|
goto err_nofreq;
|
|
}
|
|
|
|
osiris_dvs_tps_setdvs(true);
|
|
|
|
return 0;
|
|
|
|
err_nofreq:
|
|
gpio_free(OSIRIS_GPIO_DVS);
|
|
|
|
err_nogpio:
|
|
return ret;
|
|
}
|
|
|
|
static int __devexit osiris_dvs_remove(struct platform_device *pdev)
|
|
{
|
|
dev_info(&pdev->dev, "exiting\n");
|
|
|
|
/* disable any current dvs */
|
|
gpio_set_value(OSIRIS_GPIO_DVS, 1);
|
|
osiris_dvs_tps_setdvs(false);
|
|
|
|
cpufreq_unregister_notifier(&osiris_dvs_nb,
|
|
CPUFREQ_TRANSITION_NOTIFIER);
|
|
|
|
gpio_free(OSIRIS_GPIO_DVS);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* the CONFIG_PM block is so small, it isn't worth actaully compiling it
|
|
* out if the configuration isn't set. */
|
|
|
|
static int osiris_dvs_suspend(struct device *dev)
|
|
{
|
|
gpio_set_value(OSIRIS_GPIO_DVS, 1);
|
|
osiris_dvs_tps_setdvs(false);
|
|
cur_dvs = false;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int osiris_dvs_resume(struct device *dev)
|
|
{
|
|
osiris_dvs_tps_setdvs(true);
|
|
return 0;
|
|
}
|
|
|
|
static const struct dev_pm_ops osiris_dvs_pm = {
|
|
.suspend = osiris_dvs_suspend,
|
|
.resume = osiris_dvs_resume,
|
|
};
|
|
|
|
static struct platform_driver osiris_dvs_driver = {
|
|
.probe = osiris_dvs_probe,
|
|
.remove = __devexit_p(osiris_dvs_remove),
|
|
.driver = {
|
|
.name = "osiris-dvs",
|
|
.owner = THIS_MODULE,
|
|
.pm = &osiris_dvs_pm,
|
|
},
|
|
};
|
|
|
|
static int __init osiris_dvs_init(void)
|
|
{
|
|
return platform_driver_register(&osiris_dvs_driver);
|
|
}
|
|
|
|
static void __exit osiris_dvs_exit(void)
|
|
{
|
|
platform_driver_unregister(&osiris_dvs_driver);
|
|
}
|
|
|
|
module_init(osiris_dvs_init);
|
|
module_exit(osiris_dvs_exit);
|
|
|
|
MODULE_DESCRIPTION("Simtec OSIRIS DVS support");
|
|
MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:osiris-dvs");
|