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soc/tegra: pmc: Add I/O pad voltage support

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I/O pins on Tegra SoCs are grouped into so-called I/O pads. Each such
pad can be used to control the common voltage signal level and power
state of the pins in the given pad.

I/O pads can be powered down even if the system is active, which can
save power from that I/O interface. For SoC generations prior to
Tegra124 the I/O pad voltage is automatically detected and hence the
system software doesn't need to configure it. However, starting with
Tegra210 the detection logic has been removed, so explicit control of
the I/O pad voltage by system software is required.

Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Laxman Dewangan
2016-10-10 15:14:34 +02:00
committed by Thierry Reding
parent 95b780b3d7
commit 21b4991051
2 changed files with 332 additions and 67 deletions
Download Patch File Download Diff File Expand all files Collapse all files

126
include/soc/tegra/pmc.h
View File

@@ -76,37 +76,73 @@ int tegra_pmc_cpu_remove_clamping(unsigned int cpuid);
#define TEGRA_POWERGATE_3D0 TEGRA_POWERGATE_3D
#define TEGRA_IO_RAIL_CSIA 0
#define TEGRA_IO_RAIL_CSIB 1
#define TEGRA_IO_RAIL_DSI 2
#define TEGRA_IO_RAIL_MIPI_BIAS 3
#define TEGRA_IO_RAIL_PEX_BIAS 4
#define TEGRA_IO_RAIL_PEX_CLK1 5
#define TEGRA_IO_RAIL_PEX_CLK2 6
#define TEGRA_IO_RAIL_USB0 9
#define TEGRA_IO_RAIL_USB1 10
#define TEGRA_IO_RAIL_USB2 11
#define TEGRA_IO_RAIL_USB_BIAS 12
#define TEGRA_IO_RAIL_NAND 13
#define TEGRA_IO_RAIL_UART 14
#define TEGRA_IO_RAIL_BB 15
#define TEGRA_IO_RAIL_AUDIO 17
#define TEGRA_IO_RAIL_HSIC 19
#define TEGRA_IO_RAIL_COMP 22
#define TEGRA_IO_RAIL_HDMI 28
#define TEGRA_IO_RAIL_PEX_CNTRL 32
#define TEGRA_IO_RAIL_SDMMC1 33
#define TEGRA_IO_RAIL_SDMMC3 34
#define TEGRA_IO_RAIL_SDMMC4 35
#define TEGRA_IO_RAIL_CAM 36
#define TEGRA_IO_RAIL_RES 37
#define TEGRA_IO_RAIL_HV 38
#define TEGRA_IO_RAIL_DSIB 39
#define TEGRA_IO_RAIL_DSIC 40
#define TEGRA_IO_RAIL_DSID 41
#define TEGRA_IO_RAIL_CSIE 44
#define TEGRA_IO_RAIL_LVDS 57
#define TEGRA_IO_RAIL_SYS_DDC 58
/**
* enum tegra_io_pad - I/O pad group identifier
*
* I/O pins on Tegra SoCs are grouped into so-called I/O pads. Each such pad
* can be used to control the common voltage signal level and power state of
* the pins of the given pad.
*/
enum tegra_io_pad {
TEGRA_IO_PAD_AUDIO,
TEGRA_IO_PAD_AUDIO_HV,
TEGRA_IO_PAD_BB,
TEGRA_IO_PAD_CAM,
TEGRA_IO_PAD_COMP,
TEGRA_IO_PAD_CSIA,
TEGRA_IO_PAD_CSIB,
TEGRA_IO_PAD_CSIC,
TEGRA_IO_PAD_CSID,
TEGRA_IO_PAD_CSIE,
TEGRA_IO_PAD_CSIF,
TEGRA_IO_PAD_DBG,
TEGRA_IO_PAD_DEBUG_NONAO,
TEGRA_IO_PAD_DMIC,
TEGRA_IO_PAD_DP,
TEGRA_IO_PAD_DSI,
TEGRA_IO_PAD_DSIB,
TEGRA_IO_PAD_DSIC,
TEGRA_IO_PAD_DSID,
TEGRA_IO_PAD_EMMC,
TEGRA_IO_PAD_EMMC2,
TEGRA_IO_PAD_GPIO,
TEGRA_IO_PAD_HDMI,
TEGRA_IO_PAD_HSIC,
TEGRA_IO_PAD_HV,
TEGRA_IO_PAD_LVDS,
TEGRA_IO_PAD_MIPI_BIAS,
TEGRA_IO_PAD_NAND,
TEGRA_IO_PAD_PEX_BIAS,
TEGRA_IO_PAD_PEX_CLK1,
TEGRA_IO_PAD_PEX_CLK2,
TEGRA_IO_PAD_PEX_CNTRL,
TEGRA_IO_PAD_SDMMC1,
TEGRA_IO_PAD_SDMMC3,
TEGRA_IO_PAD_SDMMC4,
TEGRA_IO_PAD_SPI,
TEGRA_IO_PAD_SPI_HV,
TEGRA_IO_PAD_SYS_DDC,
TEGRA_IO_PAD_UART,
TEGRA_IO_PAD_USB0,
TEGRA_IO_PAD_USB1,
TEGRA_IO_PAD_USB2,
TEGRA_IO_PAD_USB3,
TEGRA_IO_PAD_USB_BIAS,
};
/* deprecated, use TEGRA_IO_PAD_{HDMI,LVDS} instead */
#define TEGRA_IO_RAIL_HDMI TEGRA_IO_PAD_HDMI
#define TEGRA_IO_RAIL_LVDS TEGRA_IO_PAD_LVDS
/**
* enum tegra_io_pad_voltage - voltage level of the I/O pad's source rail
* @TEGRA_IO_PAD_1800000UV: 1.8 V
* @TEGRA_IO_PAD_3300000UV: 3.3 V
*/
enum tegra_io_pad_voltage {
TEGRA_IO_PAD_1800000UV,
TEGRA_IO_PAD_3300000UV,
};
#ifdef CONFIG_ARCH_TEGRA
int tegra_powergate_is_powered(unsigned int id);
@@ -118,6 +154,13 @@ int tegra_powergate_remove_clamping(unsigned int id);
int tegra_powergate_sequence_power_up(unsigned int id, struct clk *clk,
struct reset_control *rst);
int tegra_io_pad_power_enable(enum tegra_io_pad id);
int tegra_io_pad_power_disable(enum tegra_io_pad id);
int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage);
int tegra_io_pad_get_voltage(enum tegra_io_pad id);
/* deprecated, use tegra_io_pad_power_{enable,disable}() instead */
int tegra_io_rail_power_on(unsigned int id);
int tegra_io_rail_power_off(unsigned int id);
#else
@@ -148,6 +191,27 @@ static inline int tegra_powergate_sequence_power_up(unsigned int id,
return -ENOSYS;
}
static inline int tegra_io_pad_power_enable(enum tegra_io_pad id)
{
return -ENOSYS;
}
static inline int tegra_io_pad_power_disable(enum tegra_io_pad id)
{
return -ENOSYS;
}
static inline int tegra_io_pad_set_voltage(enum tegra_io_pad id,
enum tegra_io_pad_voltage voltage)
{
return -ENOSYS;
}
static inline int tegra_io_pad_get_voltage(enum tegra_io_pad id)
{
return -ENOSYS;
}
static inline int tegra_io_rail_power_on(unsigned int id)
{
return -ENOSYS;