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3c54570afc
When using a tpm breakout board with rpi3, we elected to bit-bang gpio pins to emulate a spi interface, this implementation required a driver to interface with the platform specific pins and emulate spi functionality. The generic driver provides the ability to pass in a gpio_spi_data structure that contains the necessary gpio pins in order to simulate spi operations (get_access, start, stop, xfer). Change-Id: I88919e8a294c05e0cabb8224e35ae5c1ba5f2413 Signed-off-by: Tushar Khandelwal <tushar.khandelwal@arm.com> Signed-off-by: Abhi Singh <abhi.singh@arm.com>
32 lines
639 B
C
32 lines
639 B
C
/*
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* Copyright (c) 2025, Arm Limited. All rights reserved.
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*
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* SPDX-License-Identifier: BSD-3-Clause
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*/
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#ifndef GPIO_SPI_H
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#define GPIO_SPI_H
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#include <stdint.h>
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struct gpio_spi_data {
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uint8_t cs_gpio, sclk_gpio, mosi_gpio, miso_gpio, reset_gpio;
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uint32_t spi_delay_us;
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unsigned int spi_mode;
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};
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struct spi_ops {
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void (*get_access)(void);
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void (*start)(void);
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void (*stop)(void);
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int (*xfer)(unsigned int bitlen, const void *dout, void *din);
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};
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struct spi_plat {
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struct gpio_spi_data gpio_data;
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const struct spi_ops *ops;
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};
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struct spi_plat *gpio_spi_init(struct gpio_spi_data *gpio_spi_data);
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#endif /* GPIO_SPI_H */
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