/* $NetBSD: hwgpio.c,v 1.1 2024/01/23 21:48:12 jmcneill Exp $ */
/*-
* Copyright (c) 2024 Jared McNeill <
[email protected]>
* 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.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: hwgpio.c,v 1.1 2024/01/23 21:48:12 jmcneill Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpu.h>
#include <sys/device.h>
#include <sys/kmem.h>
#include <sys/bitops.h>
#include <sys/gpio.h>
#include <dev/gpio/gpiovar.h>
#include <machine/wii.h>
#include "hollywood.h"
#define PIN(_num, _name, _caps) \
{ .pin_num = (_num), \
.pin_caps = (_caps), \
.pin_defname = (_name), \
}
static gpio_pin_t hwgpio_pins[] = {
PIN( 0, "POWER", GPIO_PIN_INPUT),
PIN( 1, "SHUTDOWN", GPIO_PIN_OUTPUT),
PIN( 2, "FAN", GPIO_PIN_OUTPUT),
PIN( 3, "DC_DC", GPIO_PIN_OUTPUT),
PIN( 4, "DI_SPIN", GPIO_PIN_OUTPUT),
PIN( 5, "SLOT_LED", GPIO_PIN_OUTPUT),
PIN( 6, "EJECT_BTN", GPIO_PIN_INPUT),
PIN( 7, "SLOT_IN", GPIO_PIN_INPUT),
PIN( 8, "SENSOR_BAR", GPIO_PIN_OUTPUT),
PIN( 9, "DO_EJECT", GPIO_PIN_OUTPUT),
PIN(10, "EEP_CS", GPIO_PIN_OUTPUT),
PIN(11, "EEP_CLK", GPIO_PIN_OUTPUT),
PIN(12, "EEP_MOSI", GPIO_PIN_OUTPUT),
PIN(13, "EEP_MISO", GPIO_PIN_INPUT),
PIN(14, "AVE_SCL", GPIO_PIN_OUTPUT),
PIN(15, "AVE_SDA", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(16, "DEBUG0", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(17, "DEBUG1", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(18, "DEBUG2", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(19, "DEBUG3", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(20, "DEBUG4", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(21, "DEBUG5", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(22, "DEBUG6", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
PIN(23, "DEBUG7", GPIO_PIN_INPUT | GPIO_PIN_OUTPUT),
};
#undef PIN
struct hwgpio_softc {
struct gpio_chipset_tag sc_gp;
};
#define RD4(reg) in32(reg)
#define WR4(reg, val) out32((reg), (val))
static int
hwgpio_pin_read(void *priv, int pin)
{
return (RD4(HW_GPIOB_IN) & __BIT(pin)) != 0;
}
static void
hwgpio_pin_write(void *priv, int pin, int value)
{
uint32_t out;
int s;
s = splhigh();
out = RD4(HW_GPIOB_OUT);
if (value) {
out |= __BIT(pin);
} else {
out &= ~__BIT(pin);
}
WR4(HW_GPIOB_OUT, out);
splx(s);
}
static void
hwgpio_pin_ctl(void *priv, int pin, int flags)
{
uint32_t dir;
int s;
s = splhigh();
dir = RD4(HW_GPIOB_DIR);
if (flags & GPIO_PIN_OUTPUT) {
dir |= __BIT(pin);
} else {
dir &= ~__BIT(pin);
}
WR4(HW_GPIOB_DIR, dir);
splx(s);
}
static int
hwgpio_match(device_t parent, cfdata_t cf, void *aux)
{
return 1;
}
static void
hwgpio_attach(device_t parent, device_t self, void *aux)
{
struct hwgpio_softc * const sc = device_private(self);
struct gpio_chipset_tag *gp = &sc->sc_gp;
struct gpiobus_attach_args gba = {};
uint32_t in, out, dir;
u_int n;
gp->gp_cookie = sc;
gp->gp_pin_read = hwgpio_pin_read;
gp->gp_pin_write = hwgpio_pin_write;
gp->gp_pin_ctl = hwgpio_pin_ctl;
aprint_naive("\n");
aprint_normal(": GPIO\n");
in = RD4(HW_GPIOB_IN);
out = RD4(HW_GPIOB_OUT);
dir = RD4(HW_GPIOB_DIR);
for (n = 0; n < __arraycount(hwgpio_pins); n++) {
const uint32_t mask = __BIT(hwgpio_pins[n].pin_num);
if (dir & mask) {
hwgpio_pins[n].pin_state = (out & mask) != 0;
} else {
hwgpio_pins[n].pin_state = (in & mask) != 0;
}
}
gba.gba_gc = &sc->sc_gp;
gba.gba_pins = hwgpio_pins;
gba.gba_npins = __arraycount(hwgpio_pins);
config_found(self, &gba, NULL, CFARGS_NONE);
}
CFATTACH_DECL_NEW(hwgpio, sizeof(struct hwgpio_softc),
hwgpio_match, hwgpio_attach, NULL, NULL);
