2 * Copyright (c) 2012-2015 Oleksandr Tymoshenko <gonzo@freebsd.org>
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
34 #include <sys/malloc.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>
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>
49 #include <machine/bus.h>
50 #include <machine/fdt.h>
52 #include "vchiq_arm.h"
53 #include "vchiq_2835.h"
55 #define VCHIQ_LOCK do { \
56 mtx_lock(&bcm_vchiq_sc->lock); \
59 #define VCHIQ_UNLOCK do { \
60 mtx_unlock(&bcm_vchiq_sc->lock); \
64 #define dprintf(fmt, args...) printf(fmt, ##args)
66 #define dprintf(fmt, args...)
69 struct bcm_vchiq_softc {
71 struct resource * mem_res;
72 struct resource * irq_res;
75 bus_space_handle_t bsh;
79 static struct bcm_vchiq_softc *bcm_vchiq_sc = NULL;
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},
89 #define vchiq_read_4(reg) \
90 bus_space_read_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \
91 bcm_vchiq_sc->regs_offset)
92 #define vchiq_write_4(reg, val) \
93 bus_space_write_4(bcm_vchiq_sc->bst, bcm_vchiq_sc->bsh, (reg) + \
94 bcm_vchiq_sc->regs_offset, val)
98 void vchiq_exit(void);
101 extern VCHIQ_STATE_T g_state;
102 extern int g_cache_line_size;
105 bcm_vchiq_intr(void *arg)
107 VCHIQ_STATE_T *state = &g_state;
110 /* Read (and clear) the doorbell */
111 status = vchiq_read_4(0x40);
113 if (status & 0x4) { /* Was the doorbell rung? */
114 remote_event_pollall(state);
119 remote_event_signal(REMOTE_EVENT_T *event)
123 /* The test on the next line also ensures the write on the previous line
126 /* trigger vc interrupt */
128 vchiq_write_4(0x48, 0);
133 bcm_vchiq_probe(device_t dev)
136 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
139 device_set_desc(dev, "BCM2835 VCHIQ");
140 return (BUS_PROBE_DEFAULT);
144 bcm_vchiq_attach(device_t dev)
146 struct bcm_vchiq_softc *sc = device_get_softc(dev);
151 if (bcm_vchiq_sc != NULL)
154 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
155 if (sc->mem_res == NULL) {
156 device_printf(dev, "could not allocate memory resource\n");
160 sc->bst = rman_get_bustag(sc->mem_res);
161 sc->bsh = rman_get_bushandle(sc->mem_res);
164 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
165 if (sc->irq_res == NULL) {
166 device_printf(dev, "could not allocate interrupt resource\n");
170 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == UPSTREAM_DTB)
171 sc->regs_offset = -0x40;
173 node = ofw_bus_get_node(dev);
174 if ((OF_getencprop(node, "cache-line-size", &cell, sizeof(cell))) > 0)
175 g_cache_line_size = cell;
177 vchiq_core_initialize();
179 /* Setup and enable the timer */
180 if (bus_setup_intr(dev, sc->irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
181 NULL, bcm_vchiq_intr, sc,
182 &sc->intr_hl) != 0) {
183 bus_release_resource(dev, SYS_RES_IRQ, rid,
185 device_printf(dev, "Unable to setup the clock irq handler.\n");
189 mtx_init(&sc->lock, "vchiq", 0, MTX_DEF);
194 bus_generic_probe(dev);
195 bus_generic_attach(dev);
201 bcm_vchiq_detach(device_t dev)
203 struct bcm_vchiq_softc *sc = device_get_softc(dev);
208 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl);
209 bus_release_resource(dev, SYS_RES_IRQ, 0,
211 bus_release_resource(dev, SYS_RES_MEMORY, 0,
214 mtx_destroy(&sc->lock);
220 static device_method_t bcm_vchiq_methods[] = {
221 DEVMETHOD(device_probe, bcm_vchiq_probe),
222 DEVMETHOD(device_attach, bcm_vchiq_attach),
223 DEVMETHOD(device_detach, bcm_vchiq_detach),
226 DEVMETHOD(bus_add_child, bus_generic_add_child),
231 static driver_t bcm_vchiq_driver = {
234 sizeof(struct bcm_vchiq_softc),
237 static devclass_t bcm_vchiq_devclass;
239 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0);
240 MODULE_VERSION(vchiq, 1);