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/*-
* Copyright (c) 2012-2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
*
* 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <machine/fdt.h>
#include "vchiq_arm.h"
#include "vchiq_2835.h"
#define VCHIQ_LOCK do { \
mtx_lock(&bcm_vchiq_sc->lock); \
} while(0)
#define VCHIQ_UNLOCK do { \
mtx_unlock(&bcm_vchiq_sc->lock); \
} while(0)
#ifdef DEBUG
#define dprintf(fmt, args...) printf(fmt, ##args)
#else
#define dprintf(fmt, args...)
#endif
struct bcm_vchiq_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;
};
static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL;
#define vchiq_read_4(reg) \
bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg)
#define vchiq_write_4(reg, val) \
bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg, val)
/*
* Extern functions */
void vchiq_exit(void);
int vchiq_init(void);
extern VCHIQ_STATE_T g_state;
static void
bcm_vchiq_intr(void *arg)
{
VCHIQ_STATE_T *state = &g_state;
unsigned int status;
/* Read (and clear) the doorbell */
status = vchiq_read_4(0x40);
if (status & 0x4) { /* Was the doorbell rung? */
remote_event_pollall(state);
}
}
void
remote_event_signal(REMOTE_EVENT_T *event)
{
event->fired = 1;
/* The test on the next line also ensures the write on the previous line
has completed */
if (event->armed) {
/* trigger vc interrupt */
dsb();
vchiq_write_4(0x48, 0);
}
}
static int
bcm_vchiq_probe(device_t dev)
{
if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-vchiq")) {
device_set_desc(dev, "BCM2835 VCHIQ");
return(BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
bcm_vchiq_attach(device_t dev)
{
struct bcm_vchiq_softc *sc = device_get_softc(dev);
int rid = 0;
if (bcm_vchiq_sc != NULL)
return (EINVAL);
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);
}
vchiq_core_initialize();
/* Setup and enable the timer */
if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC,
NULL, bcm_vchiq_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, "vchiq", MTX_DEF, 0);
bcm_vchiq_sc = sc;
vchiq_init();
bus_generic_probe(dev);
bus_generic_attach(dev);
return (0);
}
static int
bcm_vchiq_detach(device_t dev)
{
struct bcm_vchiq_softc *sc = device_get_softc(dev);
vchiq_exit();
if (sc->intr_hl)
bus_teardown_intr(dev, sc->irq_res, sc->intr_hl);
bus_release_resource(dev, SYS_RES_IRQ, 0,
sc->irq_res);
bus_release_resource(dev, SYS_RES_MEMORY, 0,
sc->mem_res);
mtx_destroy(&sc->lock);
return (0);
}
static device_method_t bcm_vchiq_methods[] = {
DEVMETHOD(device_probe, bcm_vchiq_probe),
DEVMETHOD(device_attach, bcm_vchiq_attach),
DEVMETHOD(device_detach, bcm_vchiq_detach),
/* Bus interface */
DEVMETHOD(bus_add_child, bus_generic_add_child),
{ 0, 0 }
};
static driver_t bcm_vchiq_driver = {
"vchiq",
bcm_vchiq_methods,
sizeof(struct bcm_vchiq_softc),
};
static devclass_t bcm_vchiq_devclass;
DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0);
MODULE_VERSION(vchiq, 1);
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