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arm: mxs: add functions to get/set vddio 

Needed for ocotp write.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Wolfram Sang 2012-06-14 15:21:02 +02:00 committed by Sascha Hauer
parent a264890e50
commit 27b1a89e27
2 changed files with 40 additions and 0 deletions
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2
arch/arm/mach-mxs/include/mach/power.h
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@ -2,5 +2,7 @@
#define __MACH_POWER_H
void imx_power_prepare_usbphy(void);
int imx_get_vddio(void);
int imx_set_vddio(int);
#endif /* __MACH_POWER_H */

38
arch/arm/mach-mxs/power.c
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@ -11,11 +11,14 @@
*/
#include <common.h>
#include <io.h>
#include <errno.h>
#include <mach/imx-regs.h>
#define POWER_CTRL (IMX_POWER_BASE + 0x0)
#define POWER_CTRL_CLKGATE 0x40000000
#define POWER_VDDIOCTRL (IMX_POWER_BASE + 0x60)
#define POWER_STS (IMX_POWER_BASE + 0xc0)
#define POWER_STS_VBUSVALID 0x00000002
#define POWER_STS_BVALID 0x00000004
@ -26,6 +29,41 @@
#define POWER_DEBUG_AVALIDPIOLOCK 0x00000004
#define POWER_DEBUG_VBUSVALIDPIOLOCK 0x00000008
#define TRG_MASK 0x1f
int imx_get_vddio(void)
{
u32 val;
val = readl(POWER_VDDIOCTRL) & TRG_MASK;
if (val > 0x10)
val = 0x10;
return 2800000 + val * 50000;
}
int imx_set_vddio(int new_voltage_uV)
{
u32 reg, val;
if (new_voltage_uV < 2800000 || new_voltage_uV > 3600000)
return -EINVAL;
val = (new_voltage_uV - 2800000) / 50000;
reg = readl(POWER_VDDIOCTRL) & ~TRG_MASK;
writel(reg | val, POWER_VDDIOCTRL);
/*
* Wait for power to become stable. We just wait, because DC_OK can
* only detect rising voltages for DCDC. For all other cases, bootlets
* also do simple waiting, although horribly nested. We just take the
* maximum value of all cases from the bootlets and then add some.
*/
mdelay(30);
return 2800000 + val * 50000;
}
void imx_power_prepare_usbphy(void)
{
u32 reg;