e85bc74b30
The GPIO API was pretty clunky and pin settings were decentralized, making it hard to see what was happening and making GPIO stuff look like a mess, frankly. Instead of passing clunky (port, pin) pairs everywhere, GPIOs are now identified with a single int. The extra overhead should be minimal as GPIO configuration is generally not on a performance-critical path. Pin assignments are now mostly consolidated in gpio-target.h and put in various tables so gpio_init() can assign most pins at boot time. Most drivers no longer need to touch GPIOs and basic pin I/O stuff can happen without config since pins are put into the right state. IRQ pins still need to be configured manually before use. Change-Id: Ic5326284b0b2a2f613e9e76a41cb50e24af3aa47
110 lines
3.9 KiB
C
110 lines
3.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2021 Aidan MacDonald
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "gpio-x1000.h"
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const struct gpio_setting gpio_settings[PIN_COUNT] = {
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#define DEFINE_GPIO(_name, _gpio, _func) \
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{.gpio = _gpio, .func = _func},
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#define DEFINE_PINGROUP(...)
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#include "gpio-target.h"
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#undef DEFINE_GPIO
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#undef DEFINE_PINGROUP
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};
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const struct pingroup_setting pingroup_settings[PINGROUP_COUNT] = {
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#define DEFINE_GPIO(...)
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#define DEFINE_PINGROUP(_name, _port, _pins, _func) \
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{.port = _port, .pins = _pins, .func = _func},
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#include "gpio-target.h"
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#undef DEFINE_GPIO
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#undef DEFINE_PINGROUP
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};
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const char* const gpio_names[PIN_COUNT] = {
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#define DEFINE_GPIO(_name, ...) #_name,
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#define DEFINE_PINGROUP(...)
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#include "gpio-target.h"
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#undef DEFINE_GPIO
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#undef DEFINE_PINGROUP
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};
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const char* const pingroup_names[PINGROUP_COUNT] = {
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#define DEFINE_GPIO(...)
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#define DEFINE_PINGROUP(_name, ...) #_name,
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#include "gpio-target.h"
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#undef DEFINE_GPIO
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#undef DEFINE_PINGROUP
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};
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void gpio_init(void)
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{
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/* Apply all initial GPIO settings */
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for(int i = 0; i < PINGROUP_COUNT; ++i) {
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const struct pingroup_setting* d = &pingroup_settings[i];
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if(d->pins != 0)
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gpioz_configure(d->port, d->pins, d->func);
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}
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for(int i = 0; i < PIN_COUNT; ++i) {
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const struct gpio_setting* d = &gpio_settings[i];
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if(d->gpio != GPIO_NONE)
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gpioz_configure(GPION_PORT(d->gpio), GPION_MASK(d->gpio), d->func);
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}
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/* Any GPIO pins left in an IRQ trigger state need to be switched off,
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* because the drivers won't be ready to handle the interrupts until they
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* get initialized later in the boot. */
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for(int i = 0; i < 4; ++i) {
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uint32_t intbits = REG_GPIO_INT(i);
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if(intbits) {
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gpioz_configure(i, intbits, GPIOF_INPUT);
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jz_clr(GPIO_FLAG(i), intbits);
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}
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}
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}
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void gpioz_configure(int port, uint32_t pins, int func)
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{
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uint32_t intr = REG_GPIO_INT(port);
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uint32_t mask = REG_GPIO_MSK(port);
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uint32_t pat1 = REG_GPIO_PAT1(port);
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uint32_t pat0 = REG_GPIO_PAT0(port);
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/* Note: GPIO Z has _only_ set and clear registers, which are used to
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* atomically manipulate the selected GPIO port when we write GID2LD.
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* So there's not really any direct setting or clearing going on here...
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*/
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if(func & GPIO_F_INT) jz_set(GPIO_INT(GPIO_Z), (intr & pins) ^ pins);
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else jz_clr(GPIO_INT(GPIO_Z), (~intr & pins) ^ pins);
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if(func & GPIO_F_MASK) jz_set(GPIO_MSK(GPIO_Z), (mask & pins) ^ pins);
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else jz_clr(GPIO_MSK(GPIO_Z), (~mask & pins) ^ pins);
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if(func & GPIO_F_PAT1) jz_set(GPIO_PAT1(GPIO_Z), (pat1 & pins) ^ pins);
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else jz_clr(GPIO_PAT1(GPIO_Z), (~pat1 & pins) ^ pins);
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if(func & GPIO_F_PAT0) jz_set(GPIO_PAT0(GPIO_Z), (pat0 & pins) ^ pins);
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else jz_clr(GPIO_PAT0(GPIO_Z), (~pat0 & pins) ^ pins);
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REG_GPIO_Z_GID2LD = port;
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if(func & GPIO_F_PULL)
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jz_set(GPIO_PULL(port), pins);
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else
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jz_clr(GPIO_PULL(port), pins);
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}
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