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| author | Wolfram Sang <w.sang@pengutronix.de> | 2012-06-14 15:21:02 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2012-06-30 22:37:41 +0200 |
| commit | 27b1a89e272688c9aee951aca942535837287778 (patch) | |
| tree | 0e1d06e9fe3813467304cbcefffc2f5cdd408ef0 /arch | |
| parent | a264890e50b2241be4c45f0752c64341305f8ae5 (diff) | |
| download | barebox-27b1a89e272688c9aee951aca942535837287778.tar.gz barebox-27b1a89e272688c9aee951aca942535837287778.tar.xz | |
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-mxs/include/mach/power.h | 2 | ||||
| -rw-r--r-- | arch/arm/mach-mxs/power.c | 38 |
2 files changed, 40 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/include/mach/power.h b/arch/arm/mach-mxs/include/mach/power.h index 859a717f77..f429b3c31c 100644 --- a/arch/arm/mach-mxs/include/mach/power.h +++ b/arch/arm/mach-mxs/include/mach/power.h @@ -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 */ diff --git a/arch/arm/mach-mxs/power.c b/arch/arm/mach-mxs/power.c index 4645f52f88..f4d0b9e3e6 100644 --- a/arch/arm/mach-mxs/power.c +++ b/arch/arm/mach-mxs/power.c @@ -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; |