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/* $OpenBSD: ompinmux.c,v 1.2 2017/09/08 05:36:51 deraadt Exp $ */
/*
* Copyright (c) 2016 Jonathan Gray <jsg@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 <armv7/armv7/armv7var.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/fdt.h>
struct ompinmux_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_node;
};
int ompinmux_match(struct device *, void *, void *);
void ompinmux_attach(struct device *, struct device *, void *);
int ompinmux_pinctrl(uint32_t, void *);
struct cfattach ompinmux_ca = {
sizeof (struct ompinmux_softc), ompinmux_match, ompinmux_attach
};
struct cfdriver ompinmux_cd = {
NULL, "ompinmux", DV_DULL
};
int
ompinmux_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "pinctrl-single");
}
void
ompinmux_attach(struct device *parent, struct device *self, void *aux)
{
struct fdt_attach_args *faa = aux;
struct ompinmux_softc *sc = (struct ompinmux_softc *) self;
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))
panic("%s: bus_space_map failed!", __func__);
sc->sc_node = faa->fa_node;
pinctrl_register(faa->fa_node, ompinmux_pinctrl, sc);
pinctrl_byname(faa->fa_node, "default");
printf("\n");
}
int
ompinmux_pinctrl(uint32_t phandle, void *cookie)
{
struct ompinmux_softc *sc = cookie;
uint32_t *pins;
int npins;
int node;
int len;
int i, j;
int regwidth;
if (sc == NULL)
return -1;
node = OF_getnodebyphandle(phandle);
if (node == 0)
return -1;
len = OF_getproplen(node, "pinctrl-single,pins");
if (len <= 0)
return -1;
pins = malloc(len, M_TEMP, M_WAITOK);
OF_getpropintarray(node, "pinctrl-single,pins", pins, len);
npins = len / (2 * sizeof(uint32_t));
regwidth = OF_getpropint(sc->sc_node, "pinctrl-single,register-width",
0);
if (regwidth == 16) {
uint16_t regmask = OF_getpropint(sc->sc_node,
"pinctrl-single,function-mask", 0xffff);
uint32_t conf_reg;
uint16_t conf_val;
for (i = 0, j = 0; i < npins; i++, j += 2) {
conf_reg = pins[2 * i + 0];
conf_val = (bus_space_read_2(sc->sc_iot, sc->sc_ioh,
conf_reg) & ~regmask) | pins[2 * i + 1];
bus_space_write_2(sc->sc_iot, sc->sc_ioh, conf_reg,
conf_val);
}
} else if (regwidth == 32) {
uint32_t regmask = OF_getpropint(sc->sc_node,
"pinctrl-single,function-mask", 0xffffffff);
uint32_t conf_reg, conf_val;
for (i = 0, j = 0; i < npins; i++, j += 2) {
conf_reg = pins[2 * i + 0];
conf_val = (bus_space_read_4(sc->sc_iot, sc->sc_ioh,
conf_reg) & ~regmask) | pins[2 * i + 1];
bus_space_write_4(sc->sc_iot, sc->sc_ioh, conf_reg,
conf_val);
}
}
free(pins, M_TEMP, len);
return 0;
}
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