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freebsd/sys/arm/at91/at91_piovar.h

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Add support for configuring pins to be one of {GPIO, PERIPHERAL A or PERIPHERAL B}, as well as direction of GPIO pin. Add defines for all the pins.
2006-07-02 03:50:44 +00:00
/*-
* Copyright (c) 2006 M. Warner Losh. 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 THE AUTHOR ``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 THE AUTHOR 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_AT91_PIOVAR_H
#define ARM_AT91_AT91_PIOVAR_H
MFp4: Introduce framework to configure the multiplexed pins on boot. Since the USART supprots RS-485 multidrop mode, it allows the TX pins to float. However, for RS-232 operations, we don't want these pins to float. Instead, they should be pulled up to avoid mismatches. Linux does something similar when it configures the TX lines. This implies that we also allow the RX lines to float rather than be in the state they are left in by the boot loader. Since they are input pins, I think that this is the right thing to do. Plus minor for our board.
2006-07-14 22:22:57 +00:00
void at91_pio_use_periph_a(uint32_t pio, uint32_t periph_a_mask, int use_pullup);
void at91_pio_use_periph_b(uint32_t pio, uint32_t periph_b_mask, int use_pullup);
Add support for configuring pins to be one of {GPIO, PERIPHERAL A or PERIPHERAL B}, as well as direction of GPIO pin. Add defines for all the pins.
2006-07-02 03:50:44 +00:00
void at91_pio_use_gpio(uint32_t pio, uint32_t gpio_mask);
void at91_pio_gpio_input(uint32_t pio, uint32_t input_enable_mask);
MFp4: Introduce framework to configure the multiplexed pins on boot. Since the USART supprots RS-485 multidrop mode, it allows the TX pins to float. However, for RS-232 operations, we don't want these pins to float. Instead, they should be pulled up to avoid mismatches. Linux does something similar when it configures the TX lines. This implies that we also allow the RX lines to float rather than be in the state they are left in by the boot loader. Since they are input pins, I think that this is the right thing to do. Plus minor for our board.
2006-07-14 22:22:57 +00:00
void at91_pio_gpio_output(uint32_t pio, uint32_t output_enable_mask,
int use_pullup);
Add support for configuring pins to be one of {GPIO, PERIPHERAL A or PERIPHERAL B}, as well as direction of GPIO pin. Add defines for all the pins.
2006-07-02 03:50:44 +00:00
void at91_pio_gpio_set(uint32_t pio, uint32_t data_mask);
void at91_pio_gpio_clear(uint32_t pio, uint32_t data_mask);
#endif /* ARM_AT91_AT91_PIOVAR_H */
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