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/* $OpenBSD: bcm2835_gpio.c,v 1.2 2020/04/25 22:15:00 kettenis Exp $ */
/*
* Copyright (c) 2020 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/device.h>
#include <sys/malloc.h>
#include <sys/systm.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>
/* Registers */
#define GPFSEL(n) (0x00 + ((n) * 4))
#define GPFSEL_MASK 0x7
#define GPFSEL_GPIO_IN 0x0
#define GPFSEL_GPIO_OUT 0x1
#define GPFSEL_ALT0 0x4
#define GPFSEL_ALT1 0x5
#define GPFSEL_ALT2 0x6
#define GPFSEL_ALT3 0x7
#define GPFSEL_ALT4 0x3
#define GPFSEL_ALT5 0x2
#define GPPUD 0x94
#define GPPUD_PUD 0x3
#define GPPUD_PUD_OFF 0x0
#define GPPUD_PUD_DOWN 0x1
#define GPPUD_PUD_UP 0x2
#define GPPUDCLK(n) (0x98 + ((n) * 4))
#define GPPULL(n) (0xe4 + ((n) * 4))
#define GPPULL_MASK 0x3
#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 bcmgpio_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
void (*sc_config_pull)(struct bcmgpio_softc *, int, int);
};
int bcmgpio_match(struct device *, void *, void *);
void bcmgpio_attach(struct device *, struct device *, void *);
struct cfattach bcmgpio_ca = {
sizeof (struct bcmgpio_softc), bcmgpio_match, bcmgpio_attach
};
struct cfdriver bcmgpio_cd = {
NULL, "bcmgpio", DV_DULL
};
void bcm2711_config_pull(struct bcmgpio_softc *, int, int);
void bcm2835_config_pull(struct bcmgpio_softc *, int, int);
int bcmgpio_pinctrl(uint32_t, void *);
int
bcmgpio_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return (OF_is_compatible(faa->fa_node, "brcm,bcm2711-gpio") ||
OF_is_compatible(faa->fa_node, "brcm,bcm2835-gpio"));
}
void
bcmgpio_attach(struct device *parent, struct device *self, void *aux)
{
struct bcmgpio_softc *sc = (struct bcmgpio_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;
}
printf("\n");
if (OF_is_compatible(faa->fa_node, "brcm,bcm2711-gpio"))
sc->sc_config_pull = bcm2711_config_pull;
else
sc->sc_config_pull = bcm2835_config_pull;
pinctrl_register(faa->fa_node, bcmgpio_pinctrl, sc);
}
void
bcmgpio_config_func(struct bcmgpio_softc *sc, int pin, int func)
{
int reg = (pin / 10);
int shift = (pin % 10) * 3;
uint32_t val;
val = HREAD4(sc, GPFSEL(reg));
val &= ~(GPFSEL_MASK << shift);
HWRITE4(sc, GPFSEL(reg), val);
val |= ((func & GPFSEL_MASK) << shift);
HWRITE4(sc, GPFSEL(reg), val);
}
void
bcm2711_config_pull(struct bcmgpio_softc *sc, int pin, int pull)
{
int reg = (pin / 16);
int shift = (pin % 16) * 2;
uint32_t val;
val = HREAD4(sc, GPPULL(reg));
val &= ~(GPPULL_MASK << shift);
pull = ((pull & 1) << 1) | ((pull & 2) >> 1);
val |= (pull << shift);
HWRITE4(sc, GPPULL(reg), val);
}
void
bcm2835_config_pull(struct bcmgpio_softc *sc, int pin, int pull)
{
int reg = (pin / 32);
int shift = (pin % 32);
HWRITE4(sc, GPPUD, pull & GPPUD_PUD);
delay(1);
HWRITE4(sc, GPPUDCLK(reg), 1 << shift);
delay(1);
HWRITE4(sc, GPPUDCLK(reg), 0);
}
int
bcmgpio_pinctrl(uint32_t phandle, void *cookie)
{
struct bcmgpio_softc *sc = cookie;
uint32_t *pins, *pull = NULL;
int len, plen = 0;
int node, i;
int func;
node = OF_getnodebyphandle(phandle);
if (node == 0)
return -1;
len = OF_getproplen(node, "brcm,pins");
if (len <= 0)
return -1;
pins = malloc(len, M_TEMP, M_WAITOK);
if (OF_getpropintarray(node, "brcm,pins", pins, len) != len)
goto fail;
func = OF_getpropint(node, "brcm,function", -1);
plen = OF_getproplen(node, "brcm,pull");
if (plen > 0) {
pull = malloc(len, M_TEMP, M_WAITOK);
if (OF_getpropintarray(node, "brcm,pull", pull, plen) != plen)
goto fail;
}
for (i = 0; i < len / sizeof(uint32_t); i++) {
bcmgpio_config_func(sc, pins[i], func);
if (plen > 0 && i < plen / sizeof(uint32_t))
sc->sc_config_pull(sc, pins[i], pull[i]);
}
free(pull, M_TEMP, plen);
free(pins, M_TEMP, len);
return 0;
fail:
free(pull, M_TEMP, plen);
free(pins, M_TEMP, len);
return -1;
}
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