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/* $OpenBSD: plgpio.c,v 1.1 2018/08/26 16:52:16 kettenis Exp $ */
/*
* Copyright (c) 2018 Mark Kettenis <kettenis@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <machine/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_gpio.h>
#include <dev/ofw/fdt.h>
/* Registers. */
#define GPIODATA(pin) ((1 << pin) << 2)
#define GPIODIR 0x400
#define HREAD1(sc, reg) \
(bus_space_read_1((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE1(sc, reg, val) \
bus_space_write_1((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
#define HSET1(sc, reg, bits) \
HWRITE1((sc), (reg), HREAD1((sc), (reg)) | (bits))
#define HCLR1(sc, reg, bits) \
HWRITE1((sc), (reg), HREAD1((sc), (reg)) & ~(bits))
struct plgpio_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct gpio_controller sc_gc;
};
int plgpio_match(struct device *, void *, void *);
void plgpio_attach(struct device *, struct device *, void *);
struct cfattach plgpio_ca = {
sizeof (struct plgpio_softc), plgpio_match, plgpio_attach
};
struct cfdriver plgpio_cd = {
NULL, "plgpio", DV_DULL
};
void plgpio_config_pin(void *, uint32_t *, int);
int plgpio_get_pin(void *, uint32_t *);
void plgpio_set_pin(void *, uint32_t *, int);
int
plgpio_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "arm,pl061");
}
void
plgpio_attach(struct device *parent, struct device *self, void *aux)
{
struct plgpio_softc *sc = (struct plgpio_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_iot = faa->fa_iot;
if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
faa->fa_reg[0].size, 0, &sc->sc_ioh)) {
printf(": can't map registers\n");
return;
}
sc->sc_gc.gc_node = faa->fa_node;
sc->sc_gc.gc_cookie = sc;
sc->sc_gc.gc_config_pin = plgpio_config_pin;
sc->sc_gc.gc_get_pin = plgpio_get_pin;
sc->sc_gc.gc_set_pin = plgpio_set_pin;
gpio_controller_register(&sc->sc_gc);
printf("\n");
}
void
plgpio_config_pin(void *cookie, uint32_t *cells, int config)
{
struct plgpio_softc *sc = cookie;
uint32_t pin = cells[0];
if (pin > 8)
return;
if (config & GPIO_CONFIG_OUTPUT)
HSET1(sc, GPIODIR, (1 << pin));
else
HCLR1(sc, GPIODIR, (1 << pin));
}
int
plgpio_get_pin(void *cookie, uint32_t *cells)
{
struct plgpio_softc *sc = cookie;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
uint32_t reg;
int val;
if (pin > 8)
return 0;
reg = HREAD1(sc, GPIODATA(pin));
val = !!reg;
if (flags & GPIO_ACTIVE_LOW)
val = !val;
return val;
}
void
plgpio_set_pin(void *cookie, uint32_t *cells, int val)
{
struct plgpio_softc *sc = cookie;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
if (pin > 8)
return;
if (flags & GPIO_ACTIVE_LOW)
val = !val;
if (val)
HWRITE1(sc, GPIODATA(pin), (1 << pin));
else
HWRITE1(sc, GPIODATA(pin), 0);
}
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