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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2021 Aidan MacDonald
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "gpio-x1000.h"
#include "kernel.h"
#ifndef BOOTLOADER_SPL
struct mutex gpio_z_mutex;
#endif
void gpio_init(void)
{
#ifndef BOOTLOADER_SPL
mutex_init(&gpio_z_mutex);
#endif
/* Any GPIO pins left in an IRQ trigger state need to be switched off,
* because the drivers won't be ready to handle the interrupts until they
* get initialized later in the boot. */
for(int i = 0; i < 4; ++i) {
uint32_t intbits = REG_GPIO_INT(i);
if(intbits) {
gpio_config(i, intbits, GPIO_INPUT);
jz_clr(GPIO_FLAG(i), intbits);
}
}
}
void gpio_lock(void)
{
#ifndef BOOTLOADER_SPL
mutex_lock(&gpio_z_mutex);
#endif
}
void gpio_unlock(void)
{
#ifndef BOOTLOADER_SPL
mutex_unlock(&gpio_z_mutex);
#endif
}
void gpio_config(int port, unsigned pinmask, int func)
{
unsigned intr = REG_GPIO_INT(port);
unsigned mask = REG_GPIO_MSK(port);
unsigned pat1 = REG_GPIO_PAT1(port);
unsigned pat0 = REG_GPIO_PAT0(port);
gpio_lock();
if(func & 8) jz_set(GPIO_INT(GPIO_Z), (intr & pinmask) ^ pinmask);
else jz_clr(GPIO_INT(GPIO_Z), (~intr & pinmask) ^ pinmask);
if(func & 4) jz_set(GPIO_MSK(GPIO_Z), (mask & pinmask) ^ pinmask);
else jz_clr(GPIO_MSK(GPIO_Z), (~mask & pinmask) ^ pinmask);
if(func & 2) jz_set(GPIO_PAT1(GPIO_Z), (pat1 & pinmask) ^ pinmask);
else jz_clr(GPIO_PAT1(GPIO_Z), (~pat1 & pinmask) ^ pinmask);
if(func & 1) jz_set(GPIO_PAT0(GPIO_Z), (pat0 & pinmask) ^ pinmask);
else jz_clr(GPIO_PAT0(GPIO_Z), (~pat0 & pinmask) ^ pinmask);
REG_GPIO_Z_GID2LD = port;
gpio_unlock();
gpio_set_pull(port, pinmask, func & 16);
}
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