/*- * Copyright (c) 2012 Damjan Marion * All rights reserved. * * Based on OMAP3 INTC code by Ben Gray * * 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 "pic_if.h" #define INTC_PENDING_BASIC 0x00 #define INTC_PENDING_BANK1 0x04 #define INTC_PENDING_BANK2 0x08 #define INTC_FIQ_CONTROL 0x0C #define INTC_ENABLE_BANK1 0x10 #define INTC_ENABLE_BANK2 0x14 #define INTC_ENABLE_BASIC 0x18 #define INTC_DISABLE_BANK1 0x1C #define INTC_DISABLE_BANK2 0x20 #define INTC_DISABLE_BASIC 0x24 #define BANK1_START 8 #define BANK1_END (BANK1_START + 32 - 1) #define BANK2_START (BANK1_START + 32) #define BANK2_END (BANK2_START + 32 - 1) #define IS_IRQ_BASIC(n) (((n) >= 0) && ((n) < BANK1_START)) #define IS_IRQ_BANK1(n) (((n) >= BANK1_START) && ((n) <= BANK1_END)) #define IS_IRQ_BANK2(n) (((n) >= BANK2_START) && ((n) <= BANK2_END)) #define IRQ_BANK1(n) ((n) - BANK1_START) #define IRQ_BANK2(n) ((n) - BANK2_START) #ifdef DEBUG #define dprintf(fmt, args...) printf(fmt, ##args) #else #define dprintf(fmt, args...) #endif struct bcm_intc_softc { device_t sc_dev; struct resource * intc_mem_res; struct resource * intc_irq_res; void * intc_intrhand; bus_space_tag_t intc_bst; bus_space_handle_t intc_bsh; }; #define intc_read_4(_sc, reg) \ bus_space_read_4((_sc)->intc_bst, (_sc)->intc_bsh, (reg)) #define intc_write_4(_sc, reg, val) \ bus_space_write_4((_sc)->intc_bst, (_sc)->intc_bsh, (reg), (val)) static int bcm_intc_probe(device_t); static int bcm_intc_attach(device_t); static int bcm_intc_intr(void *); static int bcm_intc_config(device_t, int, enum intr_trigger, enum intr_polarity); static void bcm_intc_mask(device_t, int); static void bcm_intc_unmask(device_t, int); static int bcm_intc_probe(device_t dev) { if (!ofw_bus_status_okay(dev)) return (ENXIO); if (!ofw_bus_is_compatible(dev, "broadcom,bcm2835-armctrl-ic")) return (ENXIO); device_set_desc(dev, "BCM2835 Interrupt Controller"); return (BUS_PROBE_DEFAULT); } static int bcm_intc_attach(device_t dev) { struct bcm_intc_softc *sc = device_get_softc(dev); int rid; sc->sc_dev = dev; rid = 0; sc->intc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); if (sc->intc_mem_res == NULL) { device_printf(dev, "could not allocate memory resource\n"); return (ENXIO); } rid = 0; sc->intc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); if (sc->intc_irq_res == NULL) { device_printf(dev, "could not alloc interrupt resource\n"); bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->intc_mem_res); return (ENXIO); } sc->intc_bst = rman_get_bustag(sc->intc_mem_res); sc->intc_bsh = rman_get_bushandle(sc->intc_mem_res); if (bus_setup_intr(dev, sc->intc_irq_res, INTR_TYPE_MISC | INTR_CONTROLLER, bcm_intc_intr, NULL, sc, &sc->intc_intrhand)) { device_printf(dev, "could not setup interrupt handler\n"); bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->intc_mem_res); bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intc_irq_res); return (ENXIO); } arm_register_pic(dev, 0); return (0); } static int bcm_intc_intr(void *arg) { struct bcm_intc_softc *sc = (struct bcm_intc_softc *)arg; uint32_t pending; int32_t irq = 0; /* TODO: should we mask last_irq? */ pending = intc_read_4(sc, INTC_PENDING_BASIC); while (irq < BANK1_START) { if (pending & (1 << irq)) arm_dispatch_irq(sc->sc_dev, NULL, irq); irq++; } pending = intc_read_4(sc, INTC_PENDING_BANK1); while (irq < BANK2_START) { if (pending & (1 << IRQ_BANK1(irq))) arm_dispatch_irq(sc->sc_dev, NULL, irq); irq++; } pending = intc_read_4(sc, INTC_PENDING_BANK2); while (irq <= BANK2_END) { if (pending & (1 << IRQ_BANK2(irq))) arm_dispatch_irq(sc->sc_dev, NULL, irq); irq++; } return (FILTER_HANDLED); } static int bcm_intc_config(device_t dev, int irq, enum intr_trigger trig, enum intr_polarity pol) { /* no-op */ return (0); } static void bcm_intc_mask(device_t dev, int nb) { struct bcm_intc_softc *sc = device_get_softc(dev); dprintf("%s: %d\n", __func__, nb); if (IS_IRQ_BASIC(nb)) intc_write_4(sc, INTC_DISABLE_BASIC, (1 << nb)); else if (IS_IRQ_BANK1(nb)) intc_write_4(sc, INTC_DISABLE_BANK1, (1 << IRQ_BANK1(nb))); else if (IS_IRQ_BANK2(nb)) intc_write_4(sc, INTC_DISABLE_BANK2, (1 << IRQ_BANK2(nb))); else printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); } static void bcm_intc_unmask(device_t dev, int nb) { struct bcm_intc_softc *sc = device_get_softc(dev); dprintf("%s: %d\n", __func__, nb); if (IS_IRQ_BASIC(nb)) intc_write_4(sc, INTC_ENABLE_BASIC, (1 << nb)); else if (IS_IRQ_BANK1(nb)) intc_write_4(sc, INTC_ENABLE_BANK1, (1 << IRQ_BANK1(nb))); else if (IS_IRQ_BANK2(nb)) intc_write_4(sc, INTC_ENABLE_BANK2, (1 << IRQ_BANK2(nb))); else printf("arm_mask_irq: Invalid IRQ number: %d\n", nb); } static device_method_t bcm_intc_methods[] = { /* Device interface */ DEVMETHOD(device_probe, bcm_intc_probe), DEVMETHOD(device_attach, bcm_intc_attach), /* Interrupt controller interface */ DEVMETHOD(pic_config, bcm_intc_config), DEVMETHOD(pic_mask, bcm_intc_mask), DEVMETHOD(pic_unmask, bcm_intc_unmask), { 0, 0 } }; static driver_t bcm_intc_driver = { "intc", bcm_intc_methods, sizeof(struct bcm_intc_softc), }; static devclass_t bcm_intc_devclass; DRIVER_MODULE(intc, simplebus, bcm_intc_driver, bcm_intc_devclass, 0, 0);