/*- * Copyright (c) 2012-2015 Oleksandr Tymoshenko * * 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: stable/11/sys/contrib/vchiq/interface/vchiq_arm/vchiq_kmod.c 307575 2016-10-18 19:15:43Z gonzo $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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; int regs_offset; }; static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL; #define BSD_DTB 1 #define UPSTREAM_DTB 2 static struct ofw_compat_data compat_data[] = { {"broadcom,bcm2835-vchiq", BSD_DTB}, {"brcm,bcm2835-vchiq", UPSTREAM_DTB}, {NULL, 0} }; #define vchiq_read_4(reg) \ bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \ bcm_vchiq_sc->regs_offset) #define vchiq_write_4(reg, val) \ bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \ bcm_vchiq_sc->regs_offset, val) /* * Extern functions */ void vchiq_exit(void); int vchiq_init(void); extern VCHIQ_STATE_T g_state; extern int g_cache_line_size; 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_search_compatible(dev, compat_data)->ocd_data == 0) return (ENXIO); device_set_desc(dev, "BCM2835 VCHIQ"); return (BUS_PROBE_DEFAULT); } static int bcm_vchiq_attach(device_t dev) { struct bcm_vchiq_softc *sc = device_get_softc(dev); phandle_t node; pcell_t cell; 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); } if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == UPSTREAM_DTB) sc->regs_offset = -0x40; node = ofw_bus_get_node(dev); if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0) g_cache_line_size = cell; vchiq_core_initialize(); /* Setup and enable the timer */ if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 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", 0, MTX_DEF); 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);