80d19ff404
always use 'M. Warner Losh' for consistency. 'All Rights Reserved.' was prescribed by the Buenos Aires Copyright Convention of 1910, but has been mostly dead since the early 1990's and completely meaningless since 2000 when Nicaragua ratified the Berne convention. Some files not done due to ambiguity of various types.
111 lines
4.6 KiB
C
111 lines
4.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (C) 2006 M. Warner Losh.
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* Copyright (C) 2012 Ian Lepore. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _ARM_AT91_GPIO_H
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#define _ARM_AT91_GPIO_H
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#ifndef _KERNEL
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#include <sys/types.h>
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#endif
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#include <sys/ioccom.h>
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/* Userland GPIO API for Atmel AT91 series SOC.
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*
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* Open /dev/pioN (where N is 0 for PIOA, 1 for PIOB, etc), and use ioctl(2)
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* calls to configure the pin(s) as needed.
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*
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* The userland interrupt support allows you to use read(2) and/or select(2) to
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* get notified of interrupts on PIO pins for which you enabled interrupt
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* notifications. Each time an interrupt occurs on a given pin, that pin number
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* is written into a buffer as a uint8_t. Thus, reading from /dev/pioN delivers
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* info on which interrupt(s) have occurred since the last read. You can also
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* use select() to block until an interrupt occurs (you still need to read() to
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* consume the interrupt number bytes from the buffer.)
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*/
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struct at91_gpio_info
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{
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uint32_t output_status; /* Current state of output pins */
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uint32_t input_status; /* 1->out 0->in bitmask */
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uint32_t highz_status; /* 1->highz 0->driven bitmask */
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uint32_t pullup_status; /* 1->floating 0->pullup engaged */
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uint32_t glitch_status; /* 0-> no glitch filter 1->gf */
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uint32_t enabled_status; /* 1->used for pio 0->other */
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uint32_t periph_status; /* 0->A periph 1->B periph */
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uint32_t intr_status; /* 1-> ISR enabled, 0->disabled */
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uint32_t extra_status[8];/* Extra status info, device depend */
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};
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struct at91_gpio_cfg
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{
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uint32_t cfgmask; /* which things change */
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#define AT91_GPIO_CFG_INPUT 0x01 /* configure input/output pins */
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#define AT91_GPIO_CFG_HI_Z 0x02 /* HiZ */
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#define AT91_GPIO_CFG_PULLUP 0x04 /* Enable/disable pullup resistors */
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#define AT91_GPIO_CFG_GLITCH 0x08 /* Glitch filtering */
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#define AT91_GPIO_CFG_GPIO 0x10 /* Use pin for PIO or peripheral */
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#define AT91_GPIO_CFG_PERIPH 0x20 /* Select which peripheral to use */
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#define AT91_GPIO_CFG_INTR 0x40 /* Select pin for interrupts */
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uint32_t iomask; /* Mask of bits to change */
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uint32_t input; /* or output */
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uint32_t hi_z; /* Disable output */
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uint32_t pullup; /* Enable pullup resistor */
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uint32_t glitch; /* Glitch filtering */
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uint32_t gpio; /* Enabled for PIO (1) or periph (0) */
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uint32_t periph; /* Select periph A (0) or periph B (1) */
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uint32_t intr; /* Enable interrupt (1), or not (0) */
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};
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struct at91_gpio_bang
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{
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uint32_t clockpin; /* clock pin MASK */
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uint32_t datapin; /* Data pin MASK */
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uint32_t bits; /* bits to clock out (all 32) */
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};
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struct at91_gpio_bang_many
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{
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uint32_t clockpin; /* clock pin MASK */
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uint32_t datapin; /* Data pin MASK */
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void *bits; /* bits to clock out */
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uint32_t numbits; /* Number of bits to clock out */
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};
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#define AT91_GPIO_SET _IOW('g', 0, uint32_t) /* Turn bits on */
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#define AT91_GPIO_CLR _IOW('g', 1, uint32_t) /* Turn bits off */
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#define AT91_GPIO_READ _IOR('g', 2, uint32_t) /* Read input bit state */
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#define AT91_GPIO_INFO _IOR('g', 3, struct at91_gpio_info) /* State of pio cfg */
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#define AT91_GPIO_CFG _IOW('g', 4, struct at91_gpio_cfg) /* Configure pio */
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#define AT91_GPIO_BANG _IOW('g', 5, struct at91_gpio_bang) /* bit bang 32 bits */
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#define AT91_GPIO_BANG_MANY _IOW('g', 6, struct at91_gpio_bang_many)/* bit bang >32 bits */
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#endif /* _ARM_AT91_GPIO_H */
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