--- /dev/null
+/* $OpenBSD: aplmbox.c,v 1.1 2021/12/18 13:33:52 kettenis Exp $ */
+/*
+ * Copyright (c) 2021 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/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_misc.h>
+#include <dev/ofw/fdt.h>
+
+#include <arm64/dev/aplmbox.h>
+
+#define MBOX_A2I_CTRL 0x110
+#define MBOX_A2I_CTRL_FULL (1 << 16)
+#define MBOX_I2A_CTRL 0x114
+#define MBOX_I2A_CTRL_EMPTY (1 << 17)
+#define MBOX_A2I_SEND0 0x800
+#define MBOX_A2I_SEND1 0x808
+#define MBOX_I2A_RECV0 0x830
+#define MBOX_I2A_RECV1 0x838
+
+#define HREAD4(sc, reg) \
+ (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HREAD8(sc, reg) \
+ (bus_space_read_8((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val) \
+ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+#define HWRITE8(sc, reg, val) \
+ bus_space_write_8((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+struct aplmbox_softc {
+ struct device sc_dev;
+ bus_space_tag_t sc_iot;
+ bus_space_handle_t sc_ioh;
+
+ void *sc_ih;
+ void (*sc_rx_callback)(void *);
+ void *sc_rx_arg;
+
+ struct mbox_device sc_md;
+};
+
+int aplmbox_match(struct device *, void *, void *);
+void aplmbox_attach(struct device *, struct device *, void *);
+
+const struct cfattach aplmbox_ca = {
+ sizeof (struct aplmbox_softc), aplmbox_match, aplmbox_attach
+};
+
+struct cfdriver aplmbox_cd = {
+ NULL, "aplmbox", DV_DULL
+};
+
+int aplmbox_intr(void *);
+void *aplmbox_channel(void *, uint32_t *, struct mbox_client *);
+int aplmbox_send(void *, const void *, size_t);
+int aplmbox_recv(void *, void *, size_t);
+
+int
+aplmbox_match(struct device *parent, void *match, void *aux)
+{
+ struct fdt_attach_args *faa = aux;
+
+ return OF_is_compatible(faa->fa_node, "apple,asc-mailbox");
+}
+
+void
+aplmbox_attach(struct device *parent, struct device *self, void *aux)
+{
+ struct aplmbox_softc *sc = (struct aplmbox_softc *)self;
+ struct fdt_attach_args *faa = aux;
+ int idx;
+
+ 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;
+ }
+
+ idx = OF_getindex(faa->fa_node, "recv-not-empty", "interrupt-names");
+ if (idx > 0) {
+ sc->sc_ih = fdt_intr_establish_idx(faa->fa_node, idx, IPL_BIO,
+ aplmbox_intr, sc, sc->sc_dev.dv_xname);
+ }
+
+ printf("\n");
+
+ sc->sc_md.md_node = faa->fa_node;
+ sc->sc_md.md_cookie = sc;
+ sc->sc_md.md_channel = aplmbox_channel;
+ sc->sc_md.md_send = aplmbox_send;
+ sc->sc_md.md_recv = aplmbox_recv;
+ mbox_register(&sc->sc_md);
+}
+
+int
+aplmbox_intr(void *arg)
+{
+ struct aplmbox_softc *sc = arg;
+ uint32_t ctrl;
+
+ ctrl = HREAD4(sc, MBOX_I2A_CTRL);
+ if (ctrl & MBOX_I2A_CTRL_EMPTY)
+ return 0;
+
+ if (sc->sc_rx_callback) {
+ sc->sc_rx_callback(sc->sc_rx_arg);
+ } else {
+ printf("%s: 0x%016llx 0x%016llx\n", sc->sc_dev.dv_xname,
+ HREAD8(sc, MBOX_I2A_RECV0), HREAD8(sc, MBOX_I2A_RECV1));
+ }
+
+ return 1;
+}
+
+void *
+aplmbox_channel(void *cookie, uint32_t *cells, struct mbox_client *mc)
+{
+ struct aplmbox_softc *sc = cookie;
+
+ if (mc) {
+ sc->sc_rx_callback = mc->mc_rx_callback;
+ sc->sc_rx_arg = mc->mc_rx_arg;
+ }
+
+ return sc;
+}
+
+int
+aplmbox_send(void *cookie, const void *data, size_t len)
+{
+ struct aplmbox_softc *sc = cookie;
+ const struct aplmbox_msg *msg = data;
+ uint32_t ctrl;
+
+ if (len != sizeof(struct aplmbox_msg))
+ return EINVAL;
+
+ ctrl = HREAD4(sc, MBOX_A2I_CTRL);
+ if (ctrl & MBOX_A2I_CTRL_FULL)
+ return EBUSY;
+
+ HWRITE8(sc, MBOX_A2I_SEND0, msg->data0);
+ HWRITE8(sc, MBOX_A2I_SEND1, msg->data1);
+
+ return 0;
+}
+
+int
+aplmbox_recv(void *cookie, void *data, size_t len)
+{
+ struct aplmbox_softc *sc = cookie;
+ struct aplmbox_msg *msg = data;
+ uint32_t ctrl;
+
+ if (len != sizeof(struct aplmbox_msg))
+ return EINVAL;
+
+ ctrl = HREAD4(sc, MBOX_I2A_CTRL);
+ if (ctrl & MBOX_I2A_CTRL_EMPTY)
+ return EAGAIN;
+
+ msg->data0 = HREAD8(sc, MBOX_I2A_RECV0);
+ msg->data1 = HREAD8(sc, MBOX_I2A_RECV1);
+
+ return 0;
+}
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