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/* $OpenBSD: aplpinctrl.c,v 1.1 2021/08/31 15:20:06 kettenis Exp $ */
/*
* Copyright (c) 2021 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 <sys/malloc.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/fdt.h>
#define APPLE_PIN(pinmux) ((pinmux) & 0xffff)
#define APPLE_FUNC(pinmux) ((pinmux) >> 16)
#define GPIO_PIN(reg) ((reg) * 4)
#define GPIO_PIN_FUNC_MASK (1 << 5)
#define GPIO_PIN_FUNC_SHIFT 5
#define HREAD4(sc, reg) \
(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE4(sc, reg, val) \
bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
struct aplpinctrl_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
};
int aplpinctrl_match(struct device *, void *, void *);
void aplpinctrl_attach(struct device *, struct device *, void *);
struct cfattach aplpinctrl_ca = {
sizeof (struct aplpinctrl_softc), aplpinctrl_match, aplpinctrl_attach
};
struct cfdriver aplpinctrl_cd = {
NULL, "aplpinctrl", DV_DULL
};
int aplpinctrl_pinctrl(uint32_t, void *);
int
aplpinctrl_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "apple,pinctrl");
}
void
aplpinctrl_attach(struct device *parent, struct device *self, void *aux)
{
struct aplpinctrl_softc *sc = (struct aplpinctrl_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;
}
pinctrl_register(faa->fa_node, aplpinctrl_pinctrl, sc);
printf("\n");
}
int
aplpinctrl_pinctrl(uint32_t phandle, void *cookie)
{
struct aplpinctrl_softc *sc = cookie;
uint32_t *pinmux;
int node, len, i;
uint16_t pin, func;
uint32_t reg;
node = OF_getnodebyphandle(phandle);
if (node == 0)
return -1;
len = OF_getproplen(node, "pinmux");
if (len <= 0)
return -1;
pinmux = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "pinmux", pinmux, len);
for (i = 0; i < len / sizeof(uint32_t); i++) {
pin = APPLE_PIN(pinmux[i]);
func = APPLE_FUNC(pinmux[i]);
reg = HREAD4(sc, GPIO_PIN(pin));
reg &= ~GPIO_PIN_FUNC_MASK;
reg |= (func << GPIO_PIN_FUNC_SHIFT) & GPIO_PIN_FUNC_MASK;
HWRITE4(sc, GPIO_PIN(pin), reg);
}
free(pinmux, M_TEMP, len);
return 0;
}
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