1 /*- 2 * Copyright (c) 2012-2015 Oleksandr Tymoshenko <gonzo@freebsd.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/param.h> 30 #include <sys/systm.h> 31 #include <sys/bus.h> 32 #include <sys/kernel.h> 33 #include <sys/module.h> 34 #include <sys/malloc.h> 35 #include <sys/rman.h> 36 #include <sys/timeet.h> 37 #include <sys/timetc.h> 38 #include <sys/watchdog.h> 39 #include <machine/bus.h> 40 #include <machine/cpu.h> 41 #include <machine/frame.h> 42 #include <machine/intr.h> 43 44 #include <dev/fdt/fdt_common.h> 45 #include <dev/ofw/openfirm.h> 46 #include <dev/ofw/ofw_bus.h> 47 #include <dev/ofw/ofw_bus_subr.h> 48 49 #include <machine/bus.h> 50 #include <machine/fdt.h> 51 52 #include "vchiq_arm.h" 53 #include "vchiq_2835.h" 54 55 #define VCHIQ_LOCK do { \ 56 mtx_lock(&bcm_vchiq_sc->lock); \ 57 } while(0) 58 59 #define VCHIQ_UNLOCK do { \ 60 mtx_unlock(&bcm_vchiq_sc->lock); \ 61 } while(0) 62 63 #ifdef DEBUG 64 #define dprintf(fmt, args...) printf(fmt, ##args) 65 #else 66 #define dprintf(fmt, args...) 67 #endif 68 69 struct bcm_vchiq_softc { 70 struct mtx lock; 71 struct resource * mem_res; 72 struct resource * irq_res; 73 void* intr_hl; 74 bus_space_tag_t bst; 75 bus_space_handle_t bsh; 76 }; 77 78 static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL; 79 80 #define vchiq_read_4(reg) \ 81 bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg) 82 #define vchiq_write_4(reg, val) \ 83 bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, reg, val) 84 85 /* 86 * Extern functions */ 87 void vchiq_exit(void); 88 int vchiq_init(void); 89 90 extern VCHIQ_STATE_T g_state; 91 92 static void 93 bcm_vchiq_intr(void *arg) 94 { 95 VCHIQ_STATE_T *state = &g_state; 96 unsigned int status; 97 98 /* Read (and clear) the doorbell */ 99 status = vchiq_read_4(0x40); 100 101 if (status & 0x4) { /* Was the doorbell rung? */ 102 remote_event_pollall(state); 103 } 104 } 105 106 void 107 remote_event_signal(REMOTE_EVENT_T *event) 108 { 109 event->fired = 1; 110 111 /* The test on the next line also ensures the write on the previous line 112 has completed */ 113 if (event->armed) { 114 /* trigger vc interrupt */ 115 dsb(); 116 vchiq_write_4(0x48, 0); 117 } 118 } 119 120 static int 121 bcm_vchiq_probe(device_t dev) 122 { 123 124 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-vchiq")) { 125 device_set_desc(dev, "BCM2835 VCHIQ"); 126 return(BUS_PROBE_DEFAULT); 127 } 128 129 return (ENXIO); 130 } 131 132 static int 133 bcm_vchiq_attach(device_t dev) 134 { 135 struct bcm_vchiq_softc *sc = device_get_softc(dev); 136 int rid = 0; 137 138 if (bcm_vchiq_sc != NULL) 139 return (EINVAL); 140 141 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 142 if (sc->mem_res == NULL) { 143 device_printf(dev, "could not allocate memory resource\n"); 144 return (ENXIO); 145 } 146 147 sc->bst = rman_get_bustag(sc->mem_res); 148 sc->bsh = rman_get_bushandle(sc->mem_res); 149 150 rid = 0; 151 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); 152 if (sc->irq_res == NULL) { 153 device_printf(dev, "could not allocate interrupt resource\n"); 154 return (ENXIO); 155 } 156 157 vchiq_core_initialize(); 158 159 /* Setup and enable the timer */ 160 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC, 161 NULL, bcm_vchiq_intr, sc, 162 &sc->intr_hl) != 0) { 163 bus_release_resource(dev, SYS_RES_IRQ, rid, 164 sc->irq_res); 165 device_printf(dev, "Unable to setup the clock irq handler.\n"); 166 return (ENXIO); 167 } 168 169 mtx_init(&sc->lock, "vchiq", MTX_DEF, 0); 170 bcm_vchiq_sc = sc; 171 172 vchiq_init(); 173 174 bus_generic_probe(dev); 175 bus_generic_attach(dev); 176 177 return (0); 178 } 179 180 static int 181 bcm_vchiq_detach(device_t dev) 182 { 183 struct bcm_vchiq_softc *sc = device_get_softc(dev); 184 185 vchiq_exit(); 186 187 if (sc->intr_hl) 188 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl); 189 bus_release_resource(dev, SYS_RES_IRQ, 0, 190 sc->irq_res); 191 bus_release_resource(dev, SYS_RES_MEMORY, 0, 192 sc->mem_res); 193 194 mtx_destroy(&sc->lock); 195 196 return (0); 197 } 198 199 200 static device_method_t bcm_vchiq_methods[] = { 201 DEVMETHOD(device_probe, bcm_vchiq_probe), 202 DEVMETHOD(device_attach, bcm_vchiq_attach), 203 DEVMETHOD(device_detach, bcm_vchiq_detach), 204 205 /* Bus interface */ 206 DEVMETHOD(bus_add_child, bus_generic_add_child), 207 208 { 0, 0 } 209 }; 210 211 static driver_t bcm_vchiq_driver = { 212 "vchiq", 213 bcm_vchiq_methods, 214 sizeof(struct bcm_vchiq_softc), 215 }; 216 217 static devclass_t bcm_vchiq_devclass; 218 219 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0); 220 MODULE_VERSION(vchiq, 1); 221