1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * This is the interface to the sandbox GPIO driver for test code which
4 * wants to change the GPIO values reported to U-Boot.
6 * Copyright (c) 2011 The Chromium OS Authors.
9 #ifndef __ASM_SANDBOX_GPIO_H
10 #define __ASM_SANDBOX_GPIO_H
13 * We use the generic interface, and add a back-channel.
15 * The back-channel functions are declared in this file. They should not be used
16 * except in test code.
18 * Test code can, for example, call sandbox_gpio_set_value() to set the value of
19 * a simulated GPIO. From then on, normal code in U-Boot will see this new
20 * value when it calls gpio_get_value().
22 * NOTE: DO NOT use the functions in this file except in test code!
24 #include <asm-generic/gpio.h>
26 /* Our own private GPIO flags, which musn't conflict with GPIOD_... */
27 #define GPIOD_EXT_HIGH BIT(31) /* external source is high (else low) */
28 #define GPIOD_EXT_DRIVEN BIT(30) /* external source is driven */
29 #define GPIOD_EXT_PULL_UP BIT(29) /* GPIO has external pull-up */
30 #define GPIOD_EXT_PULL_DOWN BIT(28) /* GPIO has external pull-down */
32 #define GPIOD_EXT_PULL (BIT(28) | BIT(29))
33 #define GPIOD_SANDBOX_MASK GENMASK(31, 28)
36 * Return the simulated value of a GPIO (used only in sandbox test code)
38 * @param dev device to use
39 * @param offset GPIO offset within bank
40 * @return -1 on error, 0 if GPIO is low, >0 if high
42 int sandbox_gpio_get_value(struct udevice *dev, unsigned int offset);
45 * Set the simulated value of a GPIO (used only in sandbox test code)
47 * @param dev device to use
48 * @param offset GPIO offset within bank
49 * @param value value to set (0 for low, non-zero for high)
50 * @return -1 on error, 0 if ok
52 int sandbox_gpio_set_value(struct udevice *dev, unsigned int offset, int value);
55 * Return the simulated direction of a GPIO (used only in sandbox test code)
57 * @param dev device to use
58 * @param offset GPIO offset within bank
59 * @return -1 on error, 0 if GPIO is input, >0 if output
61 int sandbox_gpio_get_direction(struct udevice *dev, unsigned int offset);
64 * Set the simulated direction of a GPIO (used only in sandbox test code)
66 * @param dev device to use
67 * @param offset GPIO offset within bank
68 * @param output 0 to set as input, 1 to set as output
69 * @return -1 on error, 0 if ok
71 int sandbox_gpio_set_direction(struct udevice *dev, unsigned int offset,
75 * Return the simulated flags of a GPIO (used only in sandbox test code)
77 * @param dev device to use
78 * @param offset GPIO offset within bank
79 * @return dir_flags: bitfield accesses by GPIOD_ defines
81 ulong sandbox_gpio_get_flags(struct udevice *dev, unsigned int offset);
84 * Set the simulated flags of a GPIO (used only in sandbox test code)
86 * @param dev device to use
87 * @param offset GPIO offset within bank
88 * @param flags bitfield accesses by GPIOD_ defines
89 * @return -1 on error, 0 if ok
91 int sandbox_gpio_set_flags(struct udevice *dev, unsigned int offset,