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 extern int g_cache_line_size; 92 93 static void 94 bcm_vchiq_intr(void *arg) 95 { 96 VCHIQ_STATE_T *state = &g_state; 97 unsigned int status; 98 99 /* Read (and clear) the doorbell */ 100 status = vchiq_read_4(0x40); 101 102 if (status & 0x4) { /* Was the doorbell rung? */ 103 remote_event_pollall(state); 104 } 105 } 106 107 void 108 remote_event_signal(REMOTE_EVENT_T *event) 109 { 110 event->fired = 1; 111 112 /* The test on the next line also ensures the write on the previous line 113 has completed */ 114 if (event->armed) { 115 /* trigger vc interrupt */ 116 dsb(); 117 vchiq_write_4(0x48, 0); 118 } 119 } 120 121 static int 122 bcm_vchiq_probe(device_t dev) 123 { 124 125 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-vchiq")) { 126 device_set_desc(dev, "BCM2835 VCHIQ"); 127 return(BUS_PROBE_DEFAULT); 128 } 129 130 return (ENXIO); 131 } 132 133 static int 134 bcm_vchiq_attach(device_t dev) 135 { 136 struct bcm_vchiq_softc *sc = device_get_softc(dev); 137 phandle_t node; 138 pcell_t cell; 139 int rid = 0; 140 141 if (bcm_vchiq_sc != NULL) 142 return (EINVAL); 143 144 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 145 if (sc->mem_res == NULL) { 146 device_printf(dev, "could not allocate memory resource\n"); 147 return (ENXIO); 148 } 149 150 sc->bst = rman_get_bustag(sc->mem_res); 151 sc->bsh = rman_get_bushandle(sc->mem_res); 152 153 rid = 0; 154 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); 155 if (sc->irq_res == NULL) { 156 device_printf(dev, "could not allocate interrupt resource\n"); 157 return (ENXIO); 158 } 159 160 node = ofw_bus_get_node(dev); 161 if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0) 162 g_cache_line_size = cell; 163 164 vchiq_core_initialize(); 165 166 /* Setup and enable the timer */ 167 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 168 NULL, bcm_vchiq_intr, sc, 169 &sc->intr_hl) != 0) { 170 bus_release_resource(dev, SYS_RES_IRQ, rid, 171 sc->irq_res); 172 device_printf(dev, "Unable to setup the clock irq handler.\n"); 173 return (ENXIO); 174 } 175 176 mtx_init(&sc->lock, "vchiq", 0, MTX_DEF); 177 bcm_vchiq_sc = sc; 178 179 vchiq_init(); 180 181 bus_generic_probe(dev); 182 bus_generic_attach(dev); 183 184 return (0); 185 } 186 187 static int 188 bcm_vchiq_detach(device_t dev) 189 { 190 struct bcm_vchiq_softc *sc = device_get_softc(dev); 191 192 vchiq_exit(); 193 194 if (sc->intr_hl) 195 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl); 196 bus_release_resource(dev, SYS_RES_IRQ, 0, 197 sc->irq_res); 198 bus_release_resource(dev, SYS_RES_MEMORY, 0, 199 sc->mem_res); 200 201 mtx_destroy(&sc->lock); 202 203 return (0); 204 } 205 206 207 static device_method_t bcm_vchiq_methods[] = { 208 DEVMETHOD(device_probe, bcm_vchiq_probe), 209 DEVMETHOD(device_attach, bcm_vchiq_attach), 210 DEVMETHOD(device_detach, bcm_vchiq_detach), 211 212 /* Bus interface */ 213 DEVMETHOD(bus_add_child, bus_generic_add_child), 214 215 { 0, 0 } 216 }; 217 218 static driver_t bcm_vchiq_driver = { 219 "vchiq", 220 bcm_vchiq_methods, 221 sizeof(struct bcm_vchiq_softc), 222 }; 223 224 static devclass_t bcm_vchiq_devclass; 225 226 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0); 227 MODULE_VERSION(vchiq, 1); 228