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phonesdk: step voltage regulator for Vcore

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This commit is contained in:
xsf@rock-chips.com 2011-07-22 18:26:18 +08:00
parent 3fcb591659
commit 7c2793efef
1 changed files with 112 additions and 1 deletions
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113
drivers/regulator/wm831x-dcdc.c
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@ -27,6 +27,18 @@
#include <linux/mfd/wm831x/regulator.h>
#include <linux/mfd/wm831x/pdata.h>
#include <linux/delay.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <linux/string.h>
//#include "../../arch/arm/mach-rk29/include/mach/gpio.h"
//#include <linux/hrtimer.h>
#define WM831X_BUCKV_MAX_SELECTOR 0x68
#define WM831X_BUCKP_MAX_SELECTOR 0x66
@ -301,7 +313,30 @@ static int wm831x_buckv_set_dvs(struct regulator_dev *rdev, int state)
return 0;
}
//wm831x_buckv_get_voltage
int wm831x_reg_read(struct wm831x *wm831x, unsigned short reg);
static int wm831x_buckv_read_voltage(struct regulator_dev *rdev)
{
u16 r;
int vol_read;
int ret;
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
int on_reg = dcdc->base + WM831X_DCDC_ON_CONFIG;
ret = wm831x_reg_read(wm831x, on_reg);
if (ret < 0)
return ret;
ret &= WM831X_DC1_ON_VSEL_MASK;
//printk("-readvoltage--%d---\n", ret);
vol_read = (ret-8)*12500 + 600000;
return vol_read;
}
static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
int min_uV, int max_uV)
{
@ -322,6 +357,8 @@ static int wm831x_buckv_set_voltage(struct regulator_dev *rdev,
if (dcdc->dvs_gpio && dcdc->dvs_vsel == vsel)
return wm831x_buckv_set_dvs(rdev, 1);
// printk("min_uV = %d\n", min_uV);
// printk("vsel = %d\n", vsel);
/* Always set the ON status to the minimum voltage */
ret = wm831x_set_bits(wm831x, on_reg, WM831X_DC1_ON_VSEL_MASK, vsel);
if (ret < 0)
@ -391,6 +428,80 @@ static u16 wm831x_dcdc_ilim[] = {
125, 250, 375, 500, 625, 750, 875, 1000
};
static int wm831x_buckv_set_voltage_step(struct regulator_dev * rdev, int min_uV, int max_uV)
{
int old_vol;
int new_min_uV,new_max_uV;
int diff_value,step;
int ret;
int read_vol;
struct wm831x_dcdc *dcdc = rdev_get_drvdata(rdev);
struct wm831x *wm831x = dcdc->wm831x;
struct wm831x_pdata *pdata = wm831x->dev->platform_data;
//if(strcmp(rdev->constraints->name,"DCDC2") != 0)
if(strcmp(pdata->dcdc[1]->consumer_supplies[1].supply,"vcore") != 0)
{
ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
}
else
{
old_vol = wm831x_buckv_read_voltage(rdev);
new_min_uV = old_vol;
new_max_uV = old_vol+max_uV-min_uV;
if(old_vol > min_uV) //reduce voltage
{
diff_value = (old_vol - min_uV);
for(step = 100000; step<=diff_value; step += 100000)
{
new_min_uV = old_vol-step;
new_max_uV = old_vol+max_uV-min_uV-step;
ret = wm831x_buckv_set_voltage(rdev,new_min_uV,new_max_uV);
usleep_range(1000,1000);
}
if(new_min_uV > min_uV) //0< old_vol - min_uV < 100000 ||0< new_min_uV - min_uV < 1000000
{
ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
usleep_range(1000,1000);
}
}
else //rise voltage
{
diff_value = (min_uV- old_vol);
gpio_direction_output(RK29_PIN1_PD7, GPIO_HIGH);
for(step = 100000; step<=diff_value; step += 100000)
{
new_min_uV = old_vol + step;
new_max_uV = old_vol+max_uV-min_uV+step;
ret = wm831x_buckv_set_voltage(rdev,new_min_uV,new_max_uV);
usleep_range(1000,1000);
}
if(new_min_uV < min_uV)// min_uV - old_vol < 100000 || new_min_uV - old_vol < 100000
{
ret = wm831x_buckv_set_voltage(rdev,min_uV,max_uV);
usleep_range(1000,1000);
}
}
}
return ret;
}
static int wm831x_buckv_set_current_limit(struct regulator_dev *rdev,
int min_uA, int max_uA)
{
@ -435,7 +546,7 @@ int wm831x_dcdc_set_suspend_disable(struct regulator_dev *rdev)
}
static struct regulator_ops wm831x_buckv_ops = {
.set_voltage = wm831x_buckv_set_voltage,
.set_voltage = wm831x_buckv_set_voltage_step,
.get_voltage = wm831x_buckv_get_voltage,
.list_voltage = wm831x_buckv_list_voltage,
.set_suspend_voltage = wm831x_buckv_set_suspend_voltage,