u-boot/arch/arm/include/asm/arch-tegra/gpio.h
Simon Glass 2fccd2d96b tegra: Convert tegra GPIO driver to use driver model
This is an implementation of GPIOs for Tegra that uses driver model. It has
been tested on trimslice and also using the new iotrace feature.

The implementation uses a top-level GPIO device (which has no actual GPIOS).
Under this all the banks are created as separate GPIO devices.

The GPIOs are named as per the Tegra datasheet/header files: A0..A7, B0..B7,
..., Z0..Z7, AA0..AA7, etc.

Since driver model is not yet available before relocation, or in SPL, a
special function is provided for seaboard's SPL code.

Signed-off-by: Simon Glass <sjg@chromium.org>
2014-09-10 12:59:59 -06:00

47 lines
1.2 KiB
C

/*
* Copyright (c) 2011, Google Inc. All rights reserved.
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef _TEGRA_GPIO_H_
#define _TEGRA_GPIO_H_
#define TEGRA_GPIOS_PER_PORT 8
#define TEGRA_PORTS_PER_BANK 4
#define MAX_NUM_GPIOS (TEGRA_GPIO_PORTS * TEGRA_GPIO_BANKS * 8)
#define GPIO_NAME_SIZE 20 /* gpio_request max label len */
#define GPIO_BANK(x) ((x) >> 5)
#define GPIO_PORT(x) (((x) >> 3) & 0x3)
#define GPIO_FULLPORT(x) ((x) >> 3)
#define GPIO_BIT(x) ((x) & 0x7)
enum tegra_gpio_init {
TEGRA_GPIO_INIT_IN,
TEGRA_GPIO_INIT_OUT0,
TEGRA_GPIO_INIT_OUT1,
};
struct tegra_gpio_config {
u32 gpio:16;
u32 init:2;
};
/**
* tegra_spl_gpio_direction_output() - set the output value of a GPIO
*
* This function is only used from SPL on seaboard, which needs to enable a
* GPIO to get the UART running. It could be done in U-Boot rather than SPL,
* but for now, this gets it working
*/
int tegra_spl_gpio_direction_output(int gpio, int value);
/**
* Configure a list of GPIOs
*
* @param config List of GPIO configurations
* @param len Number of config items in list
*/
void gpio_config_table(const struct tegra_gpio_config *config, int len);
#endif /* TEGRA_GPIO_H_ */