/*- * Copyright (c) 2012 Oleksandr Tymoshenko * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mbox_if.h" #define REG_READ 0x00 #define REG_POL 0x10 #define REG_SENDER 0x14 #define REG_STATUS 0x18 #define STATUS_FULL 0x80000000 #define STATUS_EMPTY 0x40000000 #define REG_CONFIG 0x1C #define CONFIG_DATA_IRQ 0x00000001 #define REG_WRITE 0x20 /* This is Mailbox 1 address */ #define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf)) #define MBOX_CHAN(msg) ((msg) & 0xf) #define MBOX_DATA(msg) ((msg) & ~0xf) #define MBOX_LOCK(sc) do { \ mtx_lock(&(sc)->lock); \ } while(0) #define MBOX_UNLOCK(sc) do { \ mtx_unlock(&(sc)->lock); \ } while(0) #ifdef DEBUG #define dprintf(fmt, args...) printf(fmt, ##args) #else #define dprintf(fmt, args...) #endif struct bcm_mbox_softc { struct mtx lock; struct resource * mem_res; struct resource * irq_res; void* intr_hl; bus_space_tag_t bst; bus_space_handle_t bsh; int msg[BCM2835_MBOX_CHANS]; struct sema sema[BCM2835_MBOX_CHANS]; }; #define mbox_read_4(sc, reg) \ bus_space_read_4((sc)->bst, (sc)->bsh, reg) #define mbox_write_4(sc, reg, val) \ bus_space_write_4((sc)->bst, (sc)->bsh, reg, val) static void bcm_mbox_intr(void *arg) { struct bcm_mbox_softc *sc = arg; int chan; uint32_t data; uint32_t msg; while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY)) { msg = mbox_read_4(sc, REG_READ); dprintf("bcm_mbox_intr: raw data %08x\n", msg); chan = MBOX_CHAN(msg); data = MBOX_DATA(msg); if (sc->msg[chan]) { printf("bcm_mbox_intr: channel %d oveflow\n", chan); continue; } dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data); sc->msg[chan] = msg; sema_post(&sc->sema[chan]); } } static int bcm_mbox_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) { device_set_desc(dev, "BCM2835 VideoCore Mailbox"); return(BUS_PROBE_DEFAULT); } return (ENXIO); } static int bcm_mbox_attach(device_t dev) { struct bcm_mbox_softc *sc = device_get_softc(dev); int i; int rid = 0; sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->mem_res == NULL) { device_printf(dev, "could not allocate memory resource\n"); return (ENXIO); } sc->bst = rman_get_bustag(sc->mem_res); sc->bsh = rman_get_bushandle(sc->mem_res); rid = 0; sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); if (sc->irq_res == NULL) { device_printf(dev, "could not allocate interrupt resource\n"); return (ENXIO); } /* Setup and enable the timer */ if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC, NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) { bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res); device_printf(dev, "Unable to setup the clock irq handler.\n"); return (ENXIO); } mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF); for (i = 0; i < BCM2835_MBOX_CHANS; i++) { sc->msg[i] = 0; sema_init(&sc->sema[i], 0, "mbox"); } /* Read all pending messages */ while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0) (void)mbox_read_4(sc, REG_READ); mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ); return (0); } /* * Mailbox API */ static int bcm_mbox_write(device_t dev, int chan, uint32_t data) { int limit = 1000; struct bcm_mbox_softc *sc = device_get_softc(dev); dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data); MBOX_LOCK(sc); while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit) DELAY(5); if (limit == 0) { printf("bcm_mbox_write: STATUS_FULL stuck"); MBOX_UNLOCK(sc); return (EAGAIN); } mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data)); MBOX_UNLOCK(sc); return (0); } static int bcm_mbox_read(device_t dev, int chan, uint32_t *data) { struct bcm_mbox_softc *sc = device_get_softc(dev); dprintf("bcm_mbox_read: chan %d\n", chan); MBOX_LOCK(sc); while (sema_trywait(&sc->sema[chan]) == 0) { /* do not unlock sc while waiting for the mbox */ if (sema_timedwait(&sc->sema[chan], 10*hz) == 0) break; printf("timeout sema for chan %d\n", chan); } /* * get data from intr handler, the same channel is never coming * because of holding sc lock. */ *data = MBOX_DATA(sc->msg[chan]); sc->msg[chan] = 0; MBOX_UNLOCK(sc); dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data); return (0); } static device_method_t bcm_mbox_methods[] = { DEVMETHOD(device_probe, bcm_mbox_probe), DEVMETHOD(device_attach, bcm_mbox_attach), DEVMETHOD(mbox_read, bcm_mbox_read), DEVMETHOD(mbox_write, bcm_mbox_write), DEVMETHOD_END }; static driver_t bcm_mbox_driver = { "mbox", bcm_mbox_methods, sizeof(struct bcm_mbox_softc), }; static devclass_t bcm_mbox_devclass; DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);