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/* $OpenBSD: mvgpio.c,v 1.1 2018/03/20 21:23:38 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/ofw_misc.h>
#include <dev/ofw/fdt.h>
/* Registers. */
#define GPIO_DOUT 0x0000
#define GPIO_DOUTEN 0x0004
#define GPIO_DINACTLOW 0x000c
#define GPIO_DIN 0x0010
#define HREAD4(sc, reg) \
(regmap_read_4((sc)->sc_rm, (sc)->sc_offset + (reg)))
#define HWRITE4(sc, reg, val) \
regmap_write_4((sc)->sc_rm, (sc)->sc_offset + (reg), (val))
#define HSET4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) | (bits))
#define HCLR4(sc, reg, bits) \
HWRITE4((sc), (reg), HREAD4((sc), (reg)) & ~(bits))
struct mvgpio_softc {
struct device sc_dev;
struct regmap *sc_rm;
bus_size_t sc_offset;
struct gpio_controller sc_gc;
};
int mvgpio_match(struct device *, void *, void *);
void mvgpio_attach(struct device *, struct device *, void *);
struct cfattach mvgpio_ca = {
sizeof (struct mvgpio_softc), mvgpio_match, mvgpio_attach
};
struct cfdriver mvgpio_cd = {
NULL, "mvgpio", DV_DULL
};
void mvgpio_config_pin(void *, uint32_t *, int);
int mvgpio_get_pin(void *, uint32_t *);
void mvgpio_set_pin(void *, uint32_t *, int);
int
mvgpio_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "marvell,armada-8k-gpio");
}
void
mvgpio_attach(struct device *parent, struct device *self, void *aux)
{
struct mvgpio_softc *sc = (struct mvgpio_softc *)self;
struct fdt_attach_args *faa = aux;
sc->sc_rm = regmap_bynode(OF_parent(faa->fa_node));
if (sc->sc_rm == NULL) {
printf(": no registers\n");
return;
}
sc->sc_offset = OF_getpropint(faa->fa_node, "offset", 0);
sc->sc_gc.gc_node = faa->fa_node;
sc->sc_gc.gc_cookie = sc;
sc->sc_gc.gc_config_pin = mvgpio_config_pin;
sc->sc_gc.gc_get_pin = mvgpio_get_pin;
sc->sc_gc.gc_set_pin = mvgpio_set_pin;
gpio_controller_register(&sc->sc_gc);
printf("\n");
}
void
mvgpio_config_pin(void *cookie, uint32_t *cells, int config)
{
struct mvgpio_softc *sc = cookie;
uint32_t pin = cells[0];
if (pin > 32)
return;
if (config & GPIO_CONFIG_OUTPUT)
HCLR4(sc, GPIO_DOUTEN, (1 << pin));
else
HSET4(sc, GPIO_DOUTEN, (1 << pin));
}
int
mvgpio_get_pin(void *cookie, uint32_t *cells)
{
struct mvgpio_softc *sc = cookie;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
uint32_t reg;
int val;
if (pin > 32)
return 0;
reg = HREAD4(sc, GPIO_DIN);
reg ^= HREAD4(sc, GPIO_DINACTLOW);
reg &= (1 << pin);
val = (reg >> pin) & 1;
if (flags & GPIO_ACTIVE_LOW)
val = !val;
return val;
}
void
mvgpio_set_pin(void *cookie, uint32_t *cells, int val)
{
struct mvgpio_softc *sc = cookie;
uint32_t pin = cells[0];
uint32_t flags = cells[1];
if (pin > 32)
return;
if (flags & GPIO_ACTIVE_LOW)
val = !val;
if (val)
HSET4(sc, GPIO_DOUT, (1 << pin));
else
HCLR4(sc, GPIO_DOUT, (1 << pin));
}
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