add35ed5b8
to check the status property in their probe routines. Simplebus used to only instantiate its children whose status="okay" but that was improper behavior, fixed in r261352. Now that it doesn't check anymore and probes all its children; the children all have to do the check because really only the children know how to properly interpret their status property strings. Right now all existing drivers only understand "okay" versus something- that's-not-okay, so they all use the new ofw_bus_status_okay() helper.
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", MTX_DEF, 0);
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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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