mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-23 11:18:54 +00:00
63cdf42e8c
add the ability for userland to be notified of changes on gpio pins via a select(2)/read(2) interface. Change the interrupt handler from filtered to threaded. Because of the uiomove() calls in the new interface, change locking from standard mutex to sx. Add / restore the at91_gpio_high_z() function. Reviewed by: imp (long ago)
109 lines
4.5 KiB
C
109 lines
4.5 KiB
C
/*-
|
|
* Copyright (C) 2006 M. Warner Losh. All rights reserved.
|
|
* Copyright (C) 2012 Ian Lepore. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _ARM_AT91_GPIO_H
|
|
#define _ARM_AT91_GPIO_H
|
|
|
|
#ifndef _KERNEL
|
|
#include <sys/types.h>
|
|
#endif
|
|
#include <sys/ioccom.h>
|
|
|
|
/* Userland GPIO API for Atmel AT91 series SOC.
|
|
*
|
|
* Open /dev/pioN (where N is 0 for PIOA, 1 for PIOB, etc), and use ioctl(2)
|
|
* calls to configure the pin(s) as needed.
|
|
*
|
|
* The userland interrupt support allows you to use read(2) and/or select(2) to
|
|
* get notified of interrupts on PIO pins for which you enabled interrupt
|
|
* notifications. Each time an interrupt occurs on a given pin, that pin number
|
|
* is written into a buffer as a uint8_t. Thus, reading from /dev/pioN delivers
|
|
* info on which interrupt(s) have occurred since the last read. You can also
|
|
* use select() to block until an interrupt occurs (you still need to read() to
|
|
* consume the interrupt number bytes from the buffer.)
|
|
*/
|
|
|
|
struct at91_gpio_info
|
|
{
|
|
uint32_t output_status; /* Current state of output pins */
|
|
uint32_t input_status; /* 1->out 0->in bitmask */
|
|
uint32_t highz_status; /* 1->highz 0->driven bitmask */
|
|
uint32_t pullup_status; /* 1->floating 0->pullup engaged */
|
|
uint32_t glitch_status; /* 0-> no glitch filter 1->gf */
|
|
uint32_t enabled_status; /* 1->used for pio 0->other */
|
|
uint32_t periph_status; /* 0->A periph 1->B periph */
|
|
uint32_t intr_status; /* 1-> ISR enabled, 0->disabled */
|
|
uint32_t extra_status[8];/* Extra status info, device depend */
|
|
};
|
|
|
|
struct at91_gpio_cfg
|
|
{
|
|
uint32_t cfgmask; /* which things change */
|
|
#define AT91_GPIO_CFG_INPUT 0x01 /* configure input/output pins */
|
|
#define AT91_GPIO_CFG_HI_Z 0x02 /* HiZ */
|
|
#define AT91_GPIO_CFG_PULLUP 0x04 /* Enable/disable pullup resistors */
|
|
#define AT91_GPIO_CFG_GLITCH 0x08 /* Glitch filtering */
|
|
#define AT91_GPIO_CFG_GPIO 0x10 /* Use pin for PIO or peripheral */
|
|
#define AT91_GPIO_CFG_PERIPH 0x20 /* Select which peripheral to use */
|
|
#define AT91_GPIO_CFG_INTR 0x40 /* Select pin for interrupts */
|
|
uint32_t iomask; /* Mask of bits to change */
|
|
uint32_t input; /* or output */
|
|
uint32_t hi_z; /* Disable output */
|
|
uint32_t pullup; /* Enable pullup resistor */
|
|
uint32_t glitch; /* Glitch filtering */
|
|
uint32_t gpio; /* Enabled for PIO (1) or periph (0) */
|
|
uint32_t periph; /* Select periph A (0) or periph B (1) */
|
|
uint32_t intr; /* Enable interrupt (1), or not (0) */
|
|
};
|
|
|
|
struct at91_gpio_bang
|
|
{
|
|
uint32_t clockpin; /* clock pin MASK */
|
|
uint32_t datapin; /* Data pin MASK */
|
|
uint32_t bits; /* bits to clock out (all 32) */
|
|
};
|
|
|
|
struct at91_gpio_bang_many
|
|
{
|
|
uint32_t clockpin; /* clock pin MASK */
|
|
uint32_t datapin; /* Data pin MASK */
|
|
void *bits; /* bits to clock out */
|
|
uint32_t numbits; /* Number of bits to clock out */
|
|
};
|
|
|
|
#define AT91_GPIO_SET _IOW('g', 0, uint32_t) /* Turn bits on */
|
|
#define AT91_GPIO_CLR _IOW('g', 1, uint32_t) /* Turn bits off */
|
|
#define AT91_GPIO_READ _IOR('g', 2, uint32_t) /* Read input bit state */
|
|
#define AT91_GPIO_INFO _IOR('g', 3, struct at91_gpio_info) /* State of pio cfg */
|
|
#define AT91_GPIO_CFG _IOW('g', 4, struct at91_gpio_cfg) /* Configure pio */
|
|
#define AT91_GPIO_BANG _IOW('g', 5, struct at91_gpio_bang) /* bit bang 32 bits */
|
|
#define AT91_GPIO_BANG_MANY _IOW('g', 6, struct at91_gpio_bang_many)/* bit bang >32 bits */
|
|
|
|
#endif /* _ARM_AT91_GPIO_H */
|
|
|