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
bcm_vchiq_intr(void * arg)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
remote_event_signal(REMOTE_EVENT_T * event)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
bcm_vchiq_probe(device_t dev)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
bcm_vchiq_attach(device_t dev)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", MTX_DEF, 0);
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
bcm_vchiq_detach(device_t dev)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