acf96dfcdc
When gpio.h gets directly or indirectly included in the DSDT ar an assembly file, everything but the preprocessor defines for the GPIOs shouldn't be included to keep IASL or the assembler happy. Signed-off-by: Felix Held <felix-coreboot@felixheld.de> Change-Id: I046ed87d3947ba5b1fcd0bdd4cffcda57bc13404 Reviewed-on: https://review.coreboot.org/c/coreboot/+/70509 Reviewed-by: Fred Reitberger <reitbergerfred@gmail.com> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
104 lines
3.9 KiB
C
104 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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#ifndef __SRC_INCLUDE_GPIO_H__
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#define __SRC_INCLUDE_GPIO_H__
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#include <soc/gpio.h> /* IWYU pragma: export */
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#ifndef __ASSEMBLER__ /* __ASSEMBLER__ also covers __ACPI__ case */
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#include <types.h>
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/* <soc/gpio.h> must typedef a gpio_t that fits in 32 bits. */
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_Static_assert(sizeof(gpio_t) <= sizeof(u32), "gpio_t doesn't fit in lb_gpio");
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/* The following functions must be implemented by SoC/board code. */
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int gpio_get(gpio_t gpio);
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void gpio_set(gpio_t gpio, int value);
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void gpio_input_pulldown(gpio_t gpio);
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void gpio_input_pullup(gpio_t gpio);
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void gpio_input(gpio_t gpio);
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void gpio_output(gpio_t gpio, int value);
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uint32_t _gpio_base3_value(const gpio_t gpio[], int num_gpio, int binary_first);
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/*
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* This function may be implemented by SoC/board code to provide
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* a mapping from a GPIO pin to controller by returning the ACPI
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* path for the controller that owns this GPIO.
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*
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* If not implemented the default handler will return NULL.
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*/
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const char *gpio_acpi_path(gpio_t gpio);
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/*
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* This function may be implemented by SoC/board code to provide
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* a mapping from the internal representation of a GPIO to the 16bit
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* value used in an ACPI GPIO pin table entry.
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*
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* If not implemented by the SOC the default handler will return 0
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* because the underlying type of gpio_t is unknown.
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*/
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uint16_t gpio_acpi_pin(gpio_t gpio);
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/*
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* Read the value presented by the set of GPIOs, when each pin is interpreted
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* as a base-2 digit (LOW = 0, HIGH = 1).
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*
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* gpio[]: pin positions to read. gpio[0] is less significant than gpio[1].
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* num_gpio: number of pins to read.
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*
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* There are also pulldown and pullup variants which default each gpio to
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* be configured with an internal pulldown and pullup, respectively.
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*/
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uint32_t gpio_base2_value(const gpio_t gpio[], int num_gpio);
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uint32_t gpio_pulldown_base2_value(const gpio_t gpio[], int num_gpio);
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uint32_t gpio_pullup_base2_value(const gpio_t gpio[], int num_gpio);
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/*
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* Read the value presented by the set of GPIOs, when each pin is interpreted
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* as a base-3 digit (LOW = 0, HIGH = 1, Z/floating = 2).
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* Example: X1 = Z, X2 = 1 -> gpio_base3_value({GPIO(X1), GPIO(X2)}) = 5
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* BASE3() from <base3.h> can generate numbers to compare the result to.
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*
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* gpio[]: pin positions to read. gpio[0] is less significant than gpio[1].
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* num_gpio: number of pins to read.
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*/
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static inline uint32_t gpio_base3_value(const gpio_t gpio[], int num_gpio)
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{
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return _gpio_base3_value(gpio, num_gpio, 0);
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}
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/*
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* Read the value presented by the set of GPIOs, when each pin is interpreted
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* as a base-3 digit (LOW = 0, HIGH = 1, Z/floating = 2) in a non-standard
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* ternary number system where the first 2^n natural numbers are represented
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* as they would be in a binary system (without any Z digits), and the following
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* 3^n-2^n numbers use the remaining ternary representations in the normal
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* ternary system order (skipping the values that were already used up).
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* This is useful for boards which initially used a binary board ID and later
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* decided to switch to tri-state after some revisions have already been built.
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* Example: For num_gpio = 2 we get the following representation:
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*
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* Number X1 X0
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* 0 0 0
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* 1 0 1
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* 2 1 0
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* 3 1 1 // Start counting ternaries back at 0 after this
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* 4 0 2 // Skipping 00 and 01 which are already used up
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* 5 1 2 // Skipping 10 and 11 which are already used up
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* 6 2 0
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* 7 2 1
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* 8 2 2
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*
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* gpio[]: pin positions to read. gpio[0] is less significant than gpio[1].
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* num_gpio: number of pins to read.
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*/
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static inline uint32_t gpio_binary_first_base3_value(const gpio_t gpio[],
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int num_gpio)
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{
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return _gpio_base3_value(gpio, num_gpio, 1);
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}
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#endif /* !__ASSEMBLER__ */
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#endif /* __SRC_INCLUDE_GPIO_H__ */
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