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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"
static const struct gpio_setting gpio_settings[PIN_COUNT] INITDATA_ATTR = {
#define DEFINE_GPIO(_name, _gpio, _func) \
{.gpio = _gpio, .func = _func},
#define DEFINE_PINGROUP(...)
#include "gpio-target.h"
#undef DEFINE_GPIO
#undef DEFINE_PINGROUP
};
static const struct pingroup_setting pingroup_settings[PINGROUP_COUNT] INITDATA_ATTR = {
#define DEFINE_GPIO(...)
#define DEFINE_PINGROUP(_name, _port, _pins, _func) \
{.port = _port, .pins = _pins, .func = _func},
#include "gpio-target.h"
#undef DEFINE_GPIO
#undef DEFINE_PINGROUP
};
#if 0 /* not needed for the time being */
static const char* const gpio_names[PIN_COUNT] = {
#define DEFINE_GPIO(_name, ...) #_name,
#define DEFINE_PINGROUP(...)
#include "gpio-target.h"
#undef DEFINE_GPIO
#undef DEFINE_PINGROUP
};
static const char* const pingroup_names[PINGROUP_COUNT] = {
#define DEFINE_GPIO(...)
#define DEFINE_PINGROUP(_name, ...) #_name,
#include "gpio-target.h"
#undef DEFINE_GPIO
#undef DEFINE_PINGROUP
};
#endif
void gpio_init(void)
{
/* Apply all initial GPIO settings */
for(int i = 0; i < PINGROUP_COUNT; ++i) {
const struct pingroup_setting* d = &pingroup_settings[i];
if(d->pins != 0)
gpioz_configure(d->port, d->pins, d->func);
}
for(int i = 0; i < PIN_COUNT; ++i) {
const struct gpio_setting* d = &gpio_settings[i];
if(d->gpio != GPIO_NONE)
gpioz_configure(GPION_PORT(d->gpio), GPION_MASK(d->gpio), d->func);
}
/* 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) {
gpioz_configure(i, intbits, GPIOF_INPUT);
jz_clr(GPIO_FLAG(i), intbits);
}
}
}
void gpioz_configure(int port, uint32_t pins, int func)
{
uint32_t intr = REG_GPIO_INT(port);
uint32_t mask = REG_GPIO_MSK(port);
uint32_t pat1 = REG_GPIO_PAT1(port);
uint32_t pat0 = REG_GPIO_PAT0(port);
/* Note: GPIO Z has _only_ set and clear registers, which are used to
* atomically manipulate the selected GPIO port when we write GID2LD.
* So there's not really any direct setting or clearing going on here...
*/
if(func & GPIO_F_INT) jz_set(GPIO_INT(GPIO_Z), (intr & pins) ^ pins);
else jz_clr(GPIO_INT(GPIO_Z), (~intr & pins) ^ pins);
if(func & GPIO_F_MASK) jz_set(GPIO_MSK(GPIO_Z), (mask & pins) ^ pins);
else jz_clr(GPIO_MSK(GPIO_Z), (~mask & pins) ^ pins);
if(func & GPIO_F_PAT1) jz_set(GPIO_PAT1(GPIO_Z), (pat1 & pins) ^ pins);
else jz_clr(GPIO_PAT1(GPIO_Z), (~pat1 & pins) ^ pins);
if(func & GPIO_F_PAT0) jz_set(GPIO_PAT0(GPIO_Z), (pat0 & pins) ^ pins);
else jz_clr(GPIO_PAT0(GPIO_Z), (~pat0 & pins) ^ pins);
REG_GPIO_Z_GID2LD = port;
if(func & GPIO_F_PULL)
jz_set(GPIO_PULL(port), pins);
else
jz_clr(GPIO_PULL(port), pins);
}
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