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https://github.com/brain-hackers/u-boot-brain
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eceb3f26f4
The HW-defined procedure for booting Tegra requires that some pins be set up as GPIOs immediately at boot in order to avoid glitches on those pins, when the pinmux is programmed. Add a feature to the GPIO driver which executes a GPIO configuration table. Board files will use this to implement the correct HW initialization procedure. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
45 lines
904 B
C
45 lines
904 B
C
/*
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* Copyright (c) 2011, Google Inc. All rights reserved.
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef _TEGRA_GPIO_H_
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#define _TEGRA_GPIO_H_
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#define MAX_NUM_GPIOS (TEGRA_GPIO_PORTS * TEGRA_GPIO_BANKS * 8)
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#define GPIO_NAME_SIZE 20 /* gpio_request max label len */
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#define GPIO_BANK(x) ((x) >> 5)
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#define GPIO_PORT(x) (((x) >> 3) & 0x3)
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#define GPIO_FULLPORT(x) ((x) >> 3)
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#define GPIO_BIT(x) ((x) & 0x7)
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enum tegra_gpio_init {
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TEGRA_GPIO_INIT_IN,
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TEGRA_GPIO_INIT_OUT0,
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TEGRA_GPIO_INIT_OUT1,
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};
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struct tegra_gpio_config {
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u32 gpio:16;
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u32 init:2;
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};
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/*
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* Tegra-specific GPIO API
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*/
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/**
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* Configure a list of GPIOs
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*
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* @param config List of GPIO configurations
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* @param len Number of config items in list
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*/
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void gpio_config_table(const struct tegra_gpio_config *config, int len);
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void gpio_info(void);
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#define gpio_status() gpio_info()
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#endif /* TEGRA_GPIO_H_ */
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