ee8ce60b6b
Spotted by: jmcneill@NetBSD.org
228 lines
5.5 KiB
C
228 lines
5.5 KiB
C
/*-
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* Copyright (c) 2012-2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
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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/frame.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 "vchiq_arm.h"
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#include "vchiq_2835.h"
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#define VCHIQ_LOCK do { \
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mtx_lock(&bcm_vchiq_sc->lock); \
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} while(0)
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#define VCHIQ_UNLOCK do { \
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mtx_unlock(&bcm_vchiq_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_vchiq_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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};
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static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL;
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#define vchiq_read_4(reg) \
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bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg)
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#define vchiq_write_4(reg, val) \
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bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg, val)
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/*
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* Extern functions */
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void vchiq_exit(void);
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int vchiq_init(void);
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extern VCHIQ_STATE_T g_state;
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extern int g_cache_line_size;
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static void
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bcm_vchiq_intr(void *arg)
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{
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VCHIQ_STATE_T *state = &g_state;
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unsigned int status;
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/* Read (and clear) the doorbell */
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status = vchiq_read_4(0x40);
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if (status & 0x4) { /* Was the doorbell rung? */
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remote_event_pollall(state);
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}
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}
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void
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remote_event_signal(REMOTE_EVENT_T *event)
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{
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event->fired = 1;
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/* The test on the next line also ensures the write on the previous line
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has completed */
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if (event->armed) {
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/* trigger vc interrupt */
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dsb();
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vchiq_write_4(0x48, 0);
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}
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}
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static int
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bcm_vchiq_probe(device_t dev)
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{
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if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-vchiq")) {
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device_set_desc(dev, "BCM2835 VCHIQ");
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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_vchiq_attach(device_t dev)
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{
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struct bcm_vchiq_softc *sc = device_get_softc(dev);
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phandle_t node;
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pcell_t cell;
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int rid = 0;
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if (bcm_vchiq_sc != NULL)
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return (EINVAL);
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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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node = ofw_bus_get_node(dev);
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if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0)
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g_cache_line_size = cell;
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vchiq_core_initialize();
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/* Setup and enable the timer */
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if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
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NULL, bcm_vchiq_intr, sc,
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&sc->intr_hl) != 0) {
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bus_release_resource(dev, SYS_RES_IRQ, rid,
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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, "vchiq", 0, MTX_DEF);
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bcm_vchiq_sc = sc;
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vchiq_init();
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bus_generic_probe(dev);
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bus_generic_attach(dev);
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return (0);
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}
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static int
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bcm_vchiq_detach(device_t dev)
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{
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struct bcm_vchiq_softc *sc = device_get_softc(dev);
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vchiq_exit();
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if (sc->intr_hl)
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bus_teardown_intr(dev, sc->irq_res, sc->intr_hl);
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bus_release_resource(dev, SYS_RES_IRQ, 0,
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sc->irq_res);
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bus_release_resource(dev, SYS_RES_MEMORY, 0,
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sc->mem_res);
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mtx_destroy(&sc->lock);
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return (0);
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}
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static device_method_t bcm_vchiq_methods[] = {
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DEVMETHOD(device_probe, bcm_vchiq_probe),
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DEVMETHOD(device_attach, bcm_vchiq_attach),
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DEVMETHOD(device_detach, bcm_vchiq_detach),
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/* Bus interface */
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DEVMETHOD(bus_add_child, bus_generic_add_child),
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{ 0, 0 }
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};
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static driver_t bcm_vchiq_driver = {
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"vchiq",
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bcm_vchiq_methods,
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sizeof(struct bcm_vchiq_softc),
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};
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static devclass_t bcm_vchiq_devclass;
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DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0);
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MODULE_VERSION(vchiq, 1);
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