267 lines
6.9 KiB
C
267 lines
6.9 KiB
C
/* $NetBSD: bcm2835_mbox.c,v 1.11 2015/07/29 14:22:49 skrll Exp $ */
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/*-
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* Copyright (c) 2012 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Nick Hudson
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: bcm2835_mbox.c,v 1.11 2015/07/29 14:22:49 skrll Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/kernel.h>
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#include <sys/timetc.h>
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#include <sys/bus.h>
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#include <sys/mutex.h>
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#include <arm/broadcom/bcm_amba.h>
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#include <arm/broadcom/bcm2835_mbox.h>
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#include <arm/broadcom/bcm2835_mboxreg.h>
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#include <arm/broadcom/bcm2835reg.h>
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struct bcm2835mbox_softc {
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device_t sc_dev;
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device_t sc_platdev;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_ioh;
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bus_dma_tag_t sc_dmat;
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void *sc_intrh;
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kmutex_t sc_lock;
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kmutex_t sc_intr_lock;
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kcondvar_t sc_chan[BCM2835_MBOX_NUMCHANNELS];
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uint32_t sc_mbox[BCM2835_MBOX_NUMCHANNELS];
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};
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static struct bcm2835mbox_softc *bcm2835mbox_sc;
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static int bcmmbox_match(device_t, cfdata_t, void *);
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static void bcmmbox_attach(device_t, device_t, void *);
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static int bcmmbox_intr1(struct bcm2835mbox_softc *, int);
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static int bcmmbox_intr(void *);
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CFATTACH_DECL_NEW(bcmmbox, sizeof(struct bcm2835mbox_softc),
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bcmmbox_match, bcmmbox_attach, NULL, NULL);
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/* ARGSUSED */
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static int
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bcmmbox_match(device_t parent, cfdata_t match, void *aux)
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{
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struct amba_attach_args *aaa = aux;
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if (strcmp(aaa->aaa_name, "bcmmbox") != 0)
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return 0;
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return 1;
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}
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static void
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bcmmbox_attach(device_t parent, device_t self, void *aux)
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{
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struct bcm2835mbox_softc *sc = device_private(self);
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struct amba_attach_args *aaa = aux;
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struct bcmmbox_attach_args baa;
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int i;
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aprint_naive("\n");
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aprint_normal(": VC mailbox\n");
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sc->sc_dev = self;
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sc->sc_iot = aaa->aaa_iot;
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sc->sc_dmat = aaa->aaa_dmat;
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE);
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mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_VM);
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for (i = 0; i < BCM2835_MBOX_NUMCHANNELS; ++i)
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cv_init(&sc->sc_chan[i], "bcmmbox");
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if (bus_space_map(aaa->aaa_iot, aaa->aaa_addr, BCM2835_MBOX_SIZE, 0,
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&sc->sc_ioh)) {
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aprint_error_dev(sc->sc_dev, "unable to map device\n");
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return;
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}
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sc->sc_intrh = intr_establish(aaa->aaa_intr, IPL_VM, IST_LEVEL,
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bcmmbox_intr, sc);
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if (sc->sc_intrh == NULL) {
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aprint_error_dev(sc->sc_dev, "unable to establish interrupt\n");
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return;
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}
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/* enable mbox interrupt */
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bus_space_write_4(sc->sc_iot, sc->sc_ioh, BCM2835_MBOX_CFG,
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BCM2835_MBOX_CFG_DATAIRQEN);
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if (bcm2835mbox_sc == NULL)
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bcm2835mbox_sc = sc;
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baa.baa_dmat = aaa->aaa_dmat;
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sc->sc_platdev = config_found_ia(self, "bcmmboxbus", &baa, NULL);
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}
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static int
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bcmmbox_intr1(struct bcm2835mbox_softc *sc, int cv)
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{
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uint32_t mbox, chan, data;
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int ret = 0;
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KASSERT(mutex_owned(&sc->sc_intr_lock));
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bus_space_barrier(sc->sc_iot, sc->sc_ioh, 0, BCM2835_MBOX_SIZE,
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BUS_SPACE_BARRIER_READ);
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while ((bus_space_read_4(sc->sc_iot, sc->sc_ioh,
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BCM2835_MBOX0_STATUS) & BCM2835_MBOX_STATUS_EMPTY) == 0) {
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mbox = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
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BCM2835_MBOX0_READ);
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chan = BCM2835_MBOX_CHAN(mbox);
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data = BCM2835_MBOX_DATA(mbox);
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ret = 1;
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if (BCM2835_MBOX_CHAN(sc->sc_mbox[chan]) != 0) {
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aprint_error("bcmmbox_intr: chan %d overflow\n",chan);
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continue;
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}
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sc->sc_mbox[chan] = data | BCM2835_MBOX_CHANMASK;
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if (cv)
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cv_broadcast(&sc->sc_chan[chan]);
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}
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return ret;
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}
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static int
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bcmmbox_intr(void *cookie)
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{
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struct bcm2835mbox_softc *sc = cookie;
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int ret;
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mutex_enter(&sc->sc_intr_lock);
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ret = bcmmbox_intr1(sc, 1);
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mutex_exit(&sc->sc_intr_lock);
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return ret;
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}
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void
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bcmmbox_read(uint8_t chan, uint32_t *data)
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{
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struct bcm2835mbox_softc *sc = bcm2835mbox_sc;
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KASSERT(sc != NULL);
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mutex_enter(&sc->sc_lock);
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mutex_enter(&sc->sc_intr_lock);
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while (BCM2835_MBOX_CHAN(sc->sc_mbox[chan]) == 0) {
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if (cold)
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bcmmbox_intr1(sc, 0);
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else
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cv_wait(&sc->sc_chan[chan], &sc->sc_intr_lock);
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}
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*data = BCM2835_MBOX_DATA(sc->sc_mbox[chan]);
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sc->sc_mbox[chan] = 0;
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mutex_exit(&sc->sc_intr_lock);
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mutex_exit(&sc->sc_lock);
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}
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void
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bcmmbox_write(uint8_t chan, uint32_t data)
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{
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struct bcm2835mbox_softc *sc = bcm2835mbox_sc;
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KASSERT(sc != NULL);
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KASSERT(BCM2835_MBOX_CHAN(chan) == chan);
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KASSERT(BCM2835_MBOX_CHAN(data) == 0);
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mutex_enter(&sc->sc_lock);
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bcm2835_mbox_write(sc->sc_iot, sc->sc_ioh, chan, data);
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mutex_exit(&sc->sc_lock);
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}
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int
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bcmmbox_request(uint8_t chan, void *buf, size_t buflen, uint32_t *pres)
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{
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struct bcm2835mbox_softc *sc = bcm2835mbox_sc;
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void *dma_buf;
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bus_dmamap_t map;
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bus_dma_segment_t segs[1];
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int nsegs;
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int error;
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KASSERT(sc != NULL);
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error = bus_dmamem_alloc(sc->sc_dmat, buflen, 16, 0, segs, 1,
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&nsegs, BUS_DMA_WAITOK);
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if (error)
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return error;
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error = bus_dmamem_map(sc->sc_dmat, segs, nsegs, buflen, &dma_buf,
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BUS_DMA_WAITOK);
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if (error)
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goto map_failed;
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error = bus_dmamap_create(sc->sc_dmat, buflen, 1, buflen, 0,
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BUS_DMA_WAITOK, &map);
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if (error)
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goto create_failed;
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error = bus_dmamap_load(sc->sc_dmat, map, dma_buf, buflen, NULL,
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BUS_DMA_WAITOK);
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if (error)
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goto load_failed;
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memcpy(dma_buf, buf, buflen);
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bus_dmamap_sync(sc->sc_dmat, map, 0, buflen,
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BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);
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bcmmbox_write(chan, map->dm_segs[0].ds_addr);
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bcmmbox_read(chan, pres);
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bus_dmamap_sync(sc->sc_dmat, map, 0, buflen,
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BUS_DMASYNC_POSTWRITE|BUS_DMASYNC_POSTREAD);
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memcpy(buf, dma_buf, buflen);
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bus_dmamap_unload(sc->sc_dmat, map);
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load_failed:
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bus_dmamap_destroy(sc->sc_dmat, map);
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create_failed:
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bus_dmamem_unmap(sc->sc_dmat, dma_buf, buflen);
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map_failed:
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bus_dmamem_free(sc->sc_dmat, segs, nsegs);
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return error;
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}
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