1 /*-
2 * Copyright (c) 2012-2015 Oleksandr Tymoshenko <[email protected]>
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 {NULL, 0}
87 };
88
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)
95
96 /*
97 * Extern functions */
98 void vchiq_exit(void);
99 int vchiq_init(void);
100
101 extern VCHIQ_STATE_T g_state;
102 extern int g_cache_line_size;
103
104 static void
bcm_vchiq_intr(void * arg)105 bcm_vchiq_intr(void *arg)
106 {
107 VCHIQ_STATE_T *state = &g_state;
108 unsigned int status;
109
110 /* Read (and clear) the doorbell */
111 status = vchiq_read_4(0x40);
112
113 if (status & 0x4) { /* Was the doorbell rung? */
114 remote_event_pollall(state);
115 }
116 }
117
118 void
remote_event_signal(REMOTE_EVENT_T * event)119 remote_event_signal(REMOTE_EVENT_T *event)
120 {
121 event->fired = 1;
122
123 /* The test on the next line also ensures the write on the previous line
124 has completed */
125 if (event->armed) {
126 /* trigger vc interrupt */
127 dsb();
128 vchiq_write_4(0x48, 0);
129 }
130 }
131
132 static int
bcm_vchiq_probe(device_t dev)133 bcm_vchiq_probe(device_t dev)
134 {
135
136 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
137 return (ENXIO);
138
139 device_set_desc(dev, "BCM2835 VCHIQ");
140 return (BUS_PROBE_DEFAULT);
141 }
142
143 static int
bcm_vchiq_attach(device_t dev)144 bcm_vchiq_attach(device_t dev)
145 {
146 struct bcm_vchiq_softc *sc = device_get_softc(dev);
147 phandle_t node;
148 pcell_t cell;
149 int rid = 0;
150
151 if (bcm_vchiq_sc != NULL)
152 return (EINVAL);
153
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");
157 return (ENXIO);
158 }
159
160 sc->bst = rman_get_bustag(sc->mem_res);
161 sc->bsh = rman_get_bushandle(sc->mem_res);
162
163 rid = 0;
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");
167 return (ENXIO);
168 }
169
170 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == UPSTREAM_DTB)
171 sc->regs_offset = -0x40;
172
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;
176
177 vchiq_core_initialize();
178
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,
184 sc->irq_res);
185 device_printf(dev, "Unable to setup the clock irq handler.\n");
186 return (ENXIO);
187 }
188
189 mtx_init(&sc->lock, "vchiq", 0, MTX_DEF);
190 bcm_vchiq_sc = sc;
191
192 vchiq_init();
193
194 bus_generic_probe(dev);
195 bus_generic_attach(dev);
196
197 return (0);
198 }
199
200 static int
bcm_vchiq_detach(device_t dev)201 bcm_vchiq_detach(device_t dev)
202 {
203 struct bcm_vchiq_softc *sc = device_get_softc(dev);
204
205 vchiq_exit();
206
207 if (sc->intr_hl)
208 bus_teardown_intr(dev, sc->irq_res, sc->intr_hl);
209 bus_release_resource(dev, SYS_RES_IRQ, 0,
210 sc->irq_res);
211 bus_release_resource(dev, SYS_RES_MEMORY, 0,
212 sc->mem_res);
213
214 mtx_destroy(&sc->lock);
215
216 return (0);
217 }
218
219
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),
224
225 /* Bus interface */
226 DEVMETHOD(bus_add_child, bus_generic_add_child),
227
228 { 0, 0 }
229 };
230
231 static driver_t bcm_vchiq_driver = {
232 "vchiq",
233 bcm_vchiq_methods,
234 sizeof(struct bcm_vchiq_softc),
235 };
236
237 static devclass_t bcm_vchiq_devclass;
238
239 DRIVER_MODULE(vchiq, simplebus, bcm_vchiq_driver, bcm_vchiq_devclass, 0, 0);
240 MODULE_VERSION(vchiq, 1);
241