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/* $OpenBSD: bcm2835_aux.c,v 1.7 2021/10/24 17:52:26 mpi Exp $ */
/*
* Copyright (c) 2017 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/bus.h>
#include <machine/fdt.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_clock.h>
#include <dev/ofw/fdt.h>
/*
* This auxiliary device handles interrupts and clocks for one UART
* and two SPI controllers. For now we only support the UART, so we
* simply register its interrupt handler directly with our parent
* interrupt controller.
*/
#define BCMAUX_UART 0
#define BCMAUX_SPI0 1
#define BCMAUX_SPI1 2
struct bcmaux_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
struct clock_device sc_cd;
struct interrupt_controller sc_ic;
};
int bcmaux_match(struct device *, void *, void *);
void bcmaux_attach(struct device *, struct device *, void *);
const struct cfattach bcmaux_ca = {
sizeof(struct bcmaux_softc), bcmaux_match, bcmaux_attach
};
struct cfdriver bcmaux_cd = {
NULL, "bcmaux", DV_DULL
};
uint32_t bcm_aux_get_frequency(void *, uint32_t *);
void *bcm_aux_intr_establish_fdt(void *, int *, int, struct cpu_info *,
int (*)(void *), void *, char *);
int
bcmaux_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "brcm,bcm2835-aux");
}
void
bcmaux_attach(struct device *parent, struct device *self, void *aux)
{
struct bcmaux_softc *sc = (struct bcmaux_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");
}
printf("\n");
sc->sc_cd.cd_node = faa->fa_node;
sc->sc_cd.cd_cookie = sc;
sc->sc_cd.cd_get_frequency = bcm_aux_get_frequency;
clock_register(&sc->sc_cd);
sc->sc_ic.ic_node = faa->fa_node;
sc->sc_ic.ic_cookie = &sc->sc_ic;
sc->sc_ic.ic_establish = bcm_aux_intr_establish_fdt;
sc->sc_ic.ic_disestablish = fdt_intr_disestablish;
sc->sc_ic.ic_barrier = intr_barrier;
fdt_intr_register(&sc->sc_ic);
}
uint32_t
bcm_aux_get_frequency(void *cookie, uint32_t *cells)
{
uint32_t idx = cells[0];
/* Only support the UART for now. */
if (idx == BCMAUX_UART)
return 500000000;
printf("%s: 0x%08x\n", __func__, idx);
return 0;
}
void *
bcm_aux_intr_establish_fdt(void *cookie, int *cells, int level,
struct cpu_info *ci, int (*func)(void *), void *arg, char *name)
{
struct interrupt_controller *ic = cookie;
uint32_t idx = cells[0];
/* Only support the UART for now. */
if (idx != BCMAUX_UART)
return NULL;
return fdt_intr_establish_cpu(ic->ic_node, level, ci, func, arg, name);
}
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