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/* $OpenBSD: qcmtx.c,v 1.1 2023/05/17 23:30:58 patrick Exp $ */
/*
* Copyright (c) 2023 Patrick Wildt <patrick@blueri.se>
*
* 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_misc.h>
#include <dev/ofw/fdt.h>
#define QCMTX_OFF(idx) ((idx) * 0x1000)
#define QCMTX_NUM_LOCKS 32
#define QCMTX_APPS_PROC_ID 1
#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 qcmtx_softc {
struct device sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_ioh;
int sc_node;
struct hwlock_device sc_hd;
};
int qcmtx_match(struct device *, void *, void *);
void qcmtx_attach(struct device *, struct device *, void *);
int qcmtx_lock(void *, uint32_t *, int);
const struct cfattach qcmtx_ca = {
sizeof (struct qcmtx_softc), qcmtx_match, qcmtx_attach
};
struct cfdriver qcmtx_cd = {
NULL, "qcmtx", DV_DULL
};
int
qcmtx_match(struct device *parent, void *match, void *aux)
{
struct fdt_attach_args *faa = aux;
return OF_is_compatible(faa->fa_node, "qcom,tcsr-mutex");
}
void
qcmtx_attach(struct device *parent, struct device *self, void *aux)
{
struct qcmtx_softc *sc = (struct qcmtx_softc *)self;
struct fdt_attach_args *faa = aux;
if (faa->fa_nreg < 1) {
printf(": no registers\n");
return;
}
sc->sc_node = faa->fa_node;
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");
sc->sc_hd.hd_node = faa->fa_node;
sc->sc_hd.hd_cookie = sc;
sc->sc_hd.hd_lock = qcmtx_lock;
hwlock_register(&sc->sc_hd);
}
int
qcmtx_lock(void *cookie, uint32_t *cells, int lock)
{
struct qcmtx_softc *sc = cookie;
int idx = cells[0];
if (idx >= QCMTX_NUM_LOCKS)
return ENXIO;
if (lock) {
HWRITE4(sc, QCMTX_OFF(idx), QCMTX_APPS_PROC_ID);
if (HREAD4(sc, QCMTX_OFF(idx)) !=
QCMTX_APPS_PROC_ID)
return EAGAIN;
KASSERT(HREAD4(sc, QCMTX_OFF(idx)) == QCMTX_APPS_PROC_ID);
} else {
KASSERT(HREAD4(sc, QCMTX_OFF(idx)) == QCMTX_APPS_PROC_ID);
HWRITE4(sc, QCMTX_OFF(idx), 0);
}
return 0;
}
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