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/* $OpenBSD: pinctrl.c,v 1.3 2019/04/23 18:32:26 kettenis Exp $ */
/*
* Copyright (c) 2018, 2019 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/intr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_misc.h>
#include <dev/ofw/ofw_pinctrl.h>
#include <dev/ofw/fdt.h>
#define HREAD2(sc, reg) \
(bus_space_read_2((sc)->sc_iot, (sc)->sc_ioh, (reg)))
#define HWRITE2(sc, reg, val) \
bus_space_write_2((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
#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 pinctrl_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
uint32_t sc_reg_width;
uint32_t sc_func_mask;
};
int pinctrl_match(struct device *, void *, void *);
void pinctrl_attach(struct device *, struct device *, void *);
struct cfattach pinctrl_ca = {
sizeof (struct pinctrl_softc), pinctrl_match, pinctrl_attach
};
struct cfdriver pinctrl_cd = {
NULL, "pinctrl", DV_DULL
};
int pinctrl_pinctrl(uint32_t, void *);
int
pinctrl_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "pinctrl-single") ||
OF_is_compatible(faa->fa_node, "pinconf-single"));
}
void
pinctrl_attach(struct device *parent, struct device *self, void *aux)
{
struct pinctrl_softc *sc = (struct pinctrl_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_reg_width = OF_getpropint(faa->fa_node,
"pinctrl-single,register-width", 0);
if (sc->sc_reg_width != 16 &&
sc->sc_reg_width != 32) {
printf(": unsupported register width\n");
return;
}
sc->sc_func_mask = OF_getpropint(faa->fa_node,
"pinctrl-single,function-mask", 0);
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, pinctrl_pinctrl, sc);
printf("\n");
}
uint32_t
pinctrl_set2(int node, char *setting, uint32_t val)
{
uint32_t values[2];
if (OF_getpropintarray(node, setting, values, sizeof(values)) !=
sizeof(values))
return val;
val &= ~values[1];
val |= (values[0] & values[1]);
return val;
}
uint32_t
pinctrl_set4(int node, char *setting, uint32_t val)
{
uint32_t values[4];
if (OF_getpropintarray(node, setting, values, sizeof(values)) !=
sizeof(values))
return val;
val &= ~values[3];
val |= (values[0] & values[3]);
return val;
}
int
pinctrl_pinctrl(uint32_t phandle, void *cookie)
{
struct pinctrl_softc *sc = cookie;
uint32_t *pins;
int node, len, i;
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);
for (i = 0; i < len / sizeof(uint32_t); i += 2) {
uint32_t reg = pins[i];
uint32_t func = pins[i + 1];
uint32_t val = 0;
if (sc->sc_reg_width == 16)
val = HREAD2(sc, reg);
else if (sc->sc_reg_width == 32)
val = HREAD4(sc, reg);
val &= ~sc->sc_func_mask;
val |= (func & sc->sc_func_mask);
val = pinctrl_set2(node, "pinctrl-single,drive-strength", val);
val = pinctrl_set4(node, "pinctrl-single,bias-pulldown", val);
val = pinctrl_set4(node, "pinctrl-single,bias-pullup", val);
if (sc->sc_reg_width == 16)
HWRITE2(sc, reg, val);
else if (sc->sc_reg_width == 32)
HWRITE4(sc, reg, val);
}
free(pins, M_TEMP, len);
return 0;
}
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