252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
/*-
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* Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
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* All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.h>
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#include <machine/bus.h>
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#include <machine/cpu.h>
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#include <machine/intr.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
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#include "mbox_if.h"
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#define REG_READ 0x00
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#define REG_POL 0x10
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#define REG_SENDER 0x14
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#define REG_STATUS 0x18
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#define STATUS_FULL 0x80000000
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#define STATUS_EMPTY 0x40000000
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#define REG_CONFIG 0x1C
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#define CONFIG_DATA_IRQ 0x00000001
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#define REG_WRITE 0x20 /* This is Mailbox 1 address */
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#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
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#define MBOX_CHAN(msg) ((msg) & 0xf)
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#define MBOX_DATA(msg) ((msg) & ~0xf)
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#define MBOX_LOCK(sc) do { \
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mtx_lock(&(sc)->lock); \
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} while(0)
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#define MBOX_UNLOCK(sc) do { \
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mtx_unlock(&(sc)->lock); \
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} while(0)
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#ifdef DEBUG
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#define dprintf(fmt, args...) printf(fmt, ##args)
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#else
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#define dprintf(fmt, args...)
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#endif
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struct bcm_mbox_softc {
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struct mtx lock;
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struct resource * mem_res;
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struct resource * irq_res;
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void* intr_hl;
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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int valid[BCM2835_MBOX_CHANS];
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int msg[BCM2835_MBOX_CHANS];
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};
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#define mbox_read_4(sc, reg) \
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bus_space_read_4((sc)->bst, (sc)->bsh, reg)
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#define mbox_write_4(sc, reg, val) \
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bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
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static void
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bcm_mbox_intr(void *arg)
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{
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struct bcm_mbox_softc *sc = arg;
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int chan;
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uint32_t data;
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uint32_t msg;
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MBOX_LOCK(sc);
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while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY)) {
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msg = mbox_read_4(sc, REG_READ);
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dprintf("bcm_mbox_intr: raw data %08x\n", msg);
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chan = MBOX_CHAN(msg);
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data = MBOX_DATA(msg);
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if (sc->valid[chan]) {
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printf("bcm_mbox_intr: channel %d oveflow\n", chan);
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continue;
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}
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dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
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sc->msg[chan] = data;
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sc->valid[chan] = 1;
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wakeup(&sc->msg[chan]);
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}
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MBOX_UNLOCK(sc);
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}
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static int
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bcm_mbox_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) {
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device_set_desc(dev, "BCM2835 VideoCore Mailbox");
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return(BUS_PROBE_DEFAULT);
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}
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return (ENXIO);
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}
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static int
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bcm_mbox_attach(device_t dev)
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{
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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int i;
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int rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->mem_res == NULL) {
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device_printf(dev, "could not allocate memory resource\n");
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return (ENXIO);
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}
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sc->bst = rman_get_bustag(sc->mem_res);
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sc->bsh = rman_get_bushandle(sc->mem_res);
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rid = 0;
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sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
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if (sc->irq_res == NULL) {
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device_printf(dev, "could not allocate interrupt resource\n");
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return (ENXIO);
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}
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/* Setup and enable the timer */
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if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
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NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
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bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
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device_printf(dev, "Unable to setup the clock irq handler.\n");
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return (ENXIO);
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}
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mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
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for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
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sc->valid[0] = 0;
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sc->msg[0] = 0;
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}
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/* Read all pending messages */
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bcm_mbox_intr(sc);
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mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
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return (0);
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}
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/*
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* Mailbox API
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*/
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static int
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bcm_mbox_write(device_t dev, int chan, uint32_t data)
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{
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int limit = 20000;
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
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MBOX_LOCK(sc);
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while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && limit--) {
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DELAY(2);
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}
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if (limit == 0) {
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printf("bcm_mbox_write: STATUS_FULL stuck");
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MBOX_UNLOCK(sc);
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return (EAGAIN);
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}
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mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
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MBOX_UNLOCK(sc);
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return (0);
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}
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static int
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bcm_mbox_read(device_t dev, int chan, uint32_t *data)
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{
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struct bcm_mbox_softc *sc = device_get_softc(dev);
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dprintf("bcm_mbox_read: chan %d\n", chan);
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MBOX_LOCK(sc);
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while (!sc->valid[chan])
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msleep(&sc->msg[chan], &sc->lock, PZERO, "vcio mbox read", 0);
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*data = sc->msg[chan];
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sc->valid[chan] = 0;
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MBOX_UNLOCK(sc);
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dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
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return (0);
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}
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static device_method_t bcm_mbox_methods[] = {
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DEVMETHOD(device_probe, bcm_mbox_probe),
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DEVMETHOD(device_attach, bcm_mbox_attach),
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DEVMETHOD(mbox_read, bcm_mbox_read),
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DEVMETHOD(mbox_write, bcm_mbox_write),
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DEVMETHOD_END
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};
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static driver_t bcm_mbox_driver = {
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"mbox",
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bcm_mbox_methods,
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sizeof(struct bcm_mbox_softc),
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};
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static devclass_t bcm_mbox_devclass;
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DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
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