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      1 /* $NetBSD: gpio.c,v 1.2 2025/11/16 22:37:49 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2025 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <lib/libsa/stand.h>
     30 
     31 #include <machine/pio.h>
     32 
     33 #include "gpio.h"
     34 
     35 #define	HW_BASE		0x0d800000
     36 #define HW_GPIOB_OUT	(HW_BASE + 0x0c0)
     37 #define HW_GPIOB_IN	(HW_BASE + 0x0c8)
     38 #define HW_GPIO_INTLVL	(HW_BASE + 0x0ec)
     39 #define HW_GPIO_INTFLAG	(HW_BASE + 0x0f0)
     40 
     41 void
     42 gpio_set(int pin)
     43 {
     44 	out32(HW_GPIOB_OUT, in32(HW_GPIOB_OUT) | __BIT(pin));
     45 }
     46 
     47 void
     48 gpio_clear(int pin)
     49 {
     50 	out32(HW_GPIOB_OUT, in32(HW_GPIOB_OUT) & ~__BIT(pin));
     51 }
     52 
     53 int
     54 gpio_get(int pin)
     55 {
     56 	return (in32(HW_GPIOB_IN) >> pin) & 1;
     57 }
     58 
     59 void
     60 gpio_enable_int(int pin)
     61 {
     62 	out32(HW_GPIO_INTLVL, in32(HW_GPIO_INTLVL) | __BIT(pin));
     63 }
     64 
     65 void
     66 gpio_disable_int(int pin)
     67 {
     68 	out32(HW_GPIO_INTLVL, in32(HW_GPIO_INTLVL) & ~__BIT(pin));
     69 }
     70 
     71 int
     72 gpio_get_int(int pin)
     73 {
     74 	return (in32(HW_GPIO_INTFLAG) >> pin) & 1;
     75 }
     76 
     77 void
     78 gpio_ack_int(int pin)
     79 {
     80 	out32(HW_GPIO_INTFLAG, __BIT(pin));
     81 }
     82