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 int regs_offset; 77 }; 78 79 static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL; 80 81 #define BSD_DTB 1 82 #define UPSTREAM_DTB 2 83 static struct ofw_compat_data compat_data[] = { 84 {"broadcom,bcm2835-vchiq", BSD_DTB}, 85 {"brcm,bcm2835-vchiq", UPSTREAM_DTB}, 86 {"brcm,bcm2711-vchiq", UPSTREAM_DTB}, 87 {NULL, 0} 88 }; 89 90 #define vchiq_read_4(reg) \ 91 bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \ 92 bcm_vchiq_sc->regs_offset) 93 #define vchiq_write_4(reg, val) \ 94 bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \ 95 bcm_vchiq_sc->regs_offset, val) 96 97 /* 98 * Extern functions */ 99 void vchiq_exit(void); 100 int vchiq_init(void); 101 102 extern VCHIQ_STATE_T g_state; 103 extern int g_cache_line_size; 104 105 static void 106 bcm_vchiq_intr(void *arg) 107 { 108 VCHIQ_STATE_T *state = &g_state; 109 unsigned int status; 110 111 /* Read (and clear) the doorbell */ 112 status = vchiq_read_4(0x40); 113 114 if (status & 0x4) { /* Was the doorbell rung? */ 115 remote_event_pollall(state); 116 } 117 } 118 119 void 120 remote_event_signal(REMOTE_EVENT_T *event) 121 { 122 event->fired = 1; 123 124 /* The test on the next line also ensures the write on the previous line 125 has completed */ 126 if (event->armed) { 127 /* trigger vc interrupt */ 128 dsb(); 129 vchiq_write_4(0x48, 0); 130 } 131 } 132 133 static int 134 bcm_vchiq_probe(device_t dev) 135 { 136 137 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 138 return (ENXIO); 139 140 device_set_desc(dev, "BCM2835 VCHIQ"); 141 return (BUS_PROBE_DEFAULT); 142 } 143 144 static int 145 bcm_vchiq_attach(device_t dev) 146 { 147 struct bcm_vchiq_softc *sc = device_get_softc(dev); 148 phandle_t node; 149 pcell_t cell; 150 int rid = 0; 151 152 if (bcm_vchiq_sc != NULL) 153 return (EINVAL); 154 155 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE); 156 if (sc->mem_res == NULL) { 157 device_printf(dev, "could not allocate memory resource\n"); 158 return (ENXIO); 159 } 160 161 sc->bst = rman_get_bustag(sc->mem_res); 162 sc->bsh = rman_get_bushandle(sc->mem_res); 163 164 rid = 0; 165 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE); 166 if (sc->irq_res == NULL) { 167 device_printf(dev, "could not allocate interrupt resource\n"); 168 return (ENXIO); 169 } 170 171 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == UPSTREAM_DTB) 172 sc->regs_offset = -0x40; 173 174 node = ofw_bus_get_node(dev); 175 if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0) 176 g_cache_line_size = cell; 177 178 vchiq_core_initialize(); 179 180 /* Setup and enable the timer */ 181 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE, 182 NULL, bcm_vchiq_intr, sc, 183 &sc->intr_hl) != 0) { 184 bus_release_resource(dev, SYS_RES_IRQ, rid, 185 sc->irq_res); 186 device_printf(dev, "Unable to setup the clock irq handler.\n"); 187 return (ENXIO); 188 } 189 190 mtx_init(&sc->lock, "vchiq", 0, MTX_DEF); 191 bcm_vchiq_sc = sc; 192 193 vchiq_init(); 194 195 bus_generic_probe(dev); 196 bus_generic_attach(dev); 197 198 return (0); 199 } 200 201 static int 202 bcm_vchiq_detach(device_t dev) 203 { 204 struct bcm_vchiq_softc *sc = device_get_softc(dev); 205 206 vchiq_exit(); 207 208 if (sc->intr_hl) 209 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl); 210 bus_release_resource(dev, SYS_RES_IRQ, 0, 211 sc->irq_res); 212 bus_release_resource(dev, SYS_RES_MEMORY, 0, 213 sc->mem_res); 214 215 mtx_destroy(&sc->lock); 216 217 return (0); 218 } 219 220 221 static device_method_t bcm_vchiq_methods[] = { 222 DEVMETHOD(device_probe, bcm_vchiq_probe), 223 DEVMETHOD(device_attach, bcm_vchiq_attach), 224 DEVMETHOD(device_detach, bcm_vchiq_detach), 225 226 /* Bus interface */ 227 DEVMETHOD(bus_add_child, bus_generic_add_child), 228 229 { 0, 0 } 230 }; 231 232 static driver_t bcm_vchiq_driver = { 233 "vchiq", 234 bcm_vchiq_methods, 235 sizeof(struct bcm_vchiq_softc), 236 }; 237 238 static devclass_t bcm_vchiq_devclass; 239 240 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0); 241 MODULE_VERSION(vchiq, 1); 242