1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
| 1/*-
2 * Copyright (c) 2012 Oleksandr Tymoshenko <gonzo@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
|
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/malloc.h>
36#include <sys/rman.h>
37#include <sys/timeet.h>
38#include <sys/timetc.h>
39#include <sys/watchdog.h>
40#include <machine/bus.h>
41#include <machine/cpu.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 <arm/broadcom/bcm2835/bcm2835_mbox.h>
53
54#include "mbox_if.h"
55
56#define REG_READ 0x00
57#define REG_POL 0x10
58#define REG_SENDER 0x14
59#define REG_STATUS 0x18
60#define STATUS_FULL 0x80000000
61#define STATUS_EMPTY 0x40000000
62#define REG_CONFIG 0x1C
63#define CONFIG_DATA_IRQ 0x00000001
64#define REG_WRITE 0x20 /* This is Mailbox 1 address */
65
66#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
67#define MBOX_CHAN(msg) ((msg) & 0xf)
68#define MBOX_DATA(msg) ((msg) & ~0xf)
69
70#define MBOX_LOCK(sc) do { \
71 mtx_lock(&(sc)->lock); \
72} while(0)
73
74#define MBOX_UNLOCK(sc) do { \
75 mtx_unlock(&(sc)->lock); \
76} while(0)
77
78#ifdef DEBUG
79#define dprintf(fmt, args...) printf(fmt, ##args)
80#else
81#define dprintf(fmt, args...)
82#endif
83
84struct bcm_mbox_softc {
85 struct mtx lock;
86 struct resource * mem_res;
87 struct resource * irq_res;
88 void* intr_hl;
89 bus_space_tag_t bst;
90 bus_space_handle_t bsh;
91 int valid[BCM2835_MBOX_CHANS];
92 int msg[BCM2835_MBOX_CHANS];
93};
94
95#define mbox_read_4(sc, reg) \
96 bus_space_read_4((sc)->bst, (sc)->bsh, reg)
97#define mbox_write_4(sc, reg, val) \
98 bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
99
100static void
101bcm_mbox_intr(void *arg)
102{
103 struct bcm_mbox_softc *sc = arg;
104 int chan;
105 uint32_t data;
106 uint32_t msg;
107
108 MBOX_LOCK(sc);
109 while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY)) {
110 msg = mbox_read_4(sc, REG_READ);
111 dprintf("bcm_mbox_intr: raw data %08x\n", msg);
112 chan = MBOX_CHAN(msg);
113 data = MBOX_DATA(msg);
114 if (sc->valid[chan]) {
115 printf("bcm_mbox_intr: channel %d oveflow\n", chan);
116 continue;
117 }
118 dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
119 sc->msg[chan] = data;
120 sc->valid[chan] = 1;
121 wakeup(&sc->msg[chan]);
122
123 }
124 MBOX_UNLOCK(sc);
125}
126
127static int
128bcm_mbox_probe(device_t dev)
129{
130
| 29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/module.h>
35#include <sys/malloc.h>
36#include <sys/rman.h>
37#include <sys/timeet.h>
38#include <sys/timetc.h>
39#include <sys/watchdog.h>
40#include <machine/bus.h>
41#include <machine/cpu.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 <arm/broadcom/bcm2835/bcm2835_mbox.h>
53
54#include "mbox_if.h"
55
56#define REG_READ 0x00
57#define REG_POL 0x10
58#define REG_SENDER 0x14
59#define REG_STATUS 0x18
60#define STATUS_FULL 0x80000000
61#define STATUS_EMPTY 0x40000000
62#define REG_CONFIG 0x1C
63#define CONFIG_DATA_IRQ 0x00000001
64#define REG_WRITE 0x20 /* This is Mailbox 1 address */
65
66#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
67#define MBOX_CHAN(msg) ((msg) & 0xf)
68#define MBOX_DATA(msg) ((msg) & ~0xf)
69
70#define MBOX_LOCK(sc) do { \
71 mtx_lock(&(sc)->lock); \
72} while(0)
73
74#define MBOX_UNLOCK(sc) do { \
75 mtx_unlock(&(sc)->lock); \
76} while(0)
77
78#ifdef DEBUG
79#define dprintf(fmt, args...) printf(fmt, ##args)
80#else
81#define dprintf(fmt, args...)
82#endif
83
84struct bcm_mbox_softc {
85 struct mtx lock;
86 struct resource * mem_res;
87 struct resource * irq_res;
88 void* intr_hl;
89 bus_space_tag_t bst;
90 bus_space_handle_t bsh;
91 int valid[BCM2835_MBOX_CHANS];
92 int msg[BCM2835_MBOX_CHANS];
93};
94
95#define mbox_read_4(sc, reg) \
96 bus_space_read_4((sc)->bst, (sc)->bsh, reg)
97#define mbox_write_4(sc, reg, val) \
98 bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
99
100static void
101bcm_mbox_intr(void *arg)
102{
103 struct bcm_mbox_softc *sc = arg;
104 int chan;
105 uint32_t data;
106 uint32_t msg;
107
108 MBOX_LOCK(sc);
109 while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY)) {
110 msg = mbox_read_4(sc, REG_READ);
111 dprintf("bcm_mbox_intr: raw data %08x\n", msg);
112 chan = MBOX_CHAN(msg);
113 data = MBOX_DATA(msg);
114 if (sc->valid[chan]) {
115 printf("bcm_mbox_intr: channel %d oveflow\n", chan);
116 continue;
117 }
118 dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
119 sc->msg[chan] = data;
120 sc->valid[chan] = 1;
121 wakeup(&sc->msg[chan]);
122
123 }
124 MBOX_UNLOCK(sc);
125}
126
127static int
128bcm_mbox_probe(device_t dev)
129{
130
|
131 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) {
132 device_set_desc(dev, "BCM2835 VideoCore Mailbox");
133 return(BUS_PROBE_DEFAULT);
134 }
135
136 return (ENXIO);
137}
138
139static int
140bcm_mbox_attach(device_t dev)
141{
142 struct bcm_mbox_softc *sc = device_get_softc(dev);
143 int i;
144 int rid = 0;
145
146 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
147 if (sc->mem_res == NULL) {
148 device_printf(dev, "could not allocate memory resource\n");
149 return (ENXIO);
150 }
151
152 sc->bst = rman_get_bustag(sc->mem_res);
153 sc->bsh = rman_get_bushandle(sc->mem_res);
154
155 rid = 0;
156 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
157 if (sc->irq_res == NULL) {
158 device_printf(dev, "could not allocate interrupt resource\n");
159 return (ENXIO);
160 }
161
162 /* Setup and enable the timer */
163 if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
164 NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
165 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
166 device_printf(dev, "Unable to setup the clock irq handler.\n");
167 return (ENXIO);
168 }
169
170 mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
171 for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
172 sc->valid[0] = 0;
173 sc->msg[0] = 0;
174 }
175
176 /* Read all pending messages */
177 bcm_mbox_intr(sc);
178
179 mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
180
181 return (0);
182}
183
184/*
185 * Mailbox API
186 */
187static int
188bcm_mbox_write(device_t dev, int chan, uint32_t data)
189{
190 int limit = 20000;
191 struct bcm_mbox_softc *sc = device_get_softc(dev);
192
193 dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
194 MBOX_LOCK(sc);
195
196 while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && limit--) {
197 DELAY(2);
198 }
199
200 if (limit == 0) {
201 printf("bcm_mbox_write: STATUS_FULL stuck");
202 MBOX_UNLOCK(sc);
203 return (EAGAIN);
204 }
205
206 mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
207
208 MBOX_UNLOCK(sc);
209 return (0);
210}
211
212static int
213bcm_mbox_read(device_t dev, int chan, uint32_t *data)
214{
215 struct bcm_mbox_softc *sc = device_get_softc(dev);
216
217 dprintf("bcm_mbox_read: chan %d\n", chan);
218 MBOX_LOCK(sc);
219 while (!sc->valid[chan])
220 msleep(&sc->msg[chan], &sc->lock, PZERO, "vcio mbox read", 0);
221 *data = sc->msg[chan];
222 sc->valid[chan] = 0;
223 MBOX_UNLOCK(sc);
224 dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
225
226 return (0);
227}
228
229static device_method_t bcm_mbox_methods[] = {
230 DEVMETHOD(device_probe, bcm_mbox_probe),
231 DEVMETHOD(device_attach, bcm_mbox_attach),
232
233 DEVMETHOD(mbox_read, bcm_mbox_read),
234 DEVMETHOD(mbox_write, bcm_mbox_write),
235
236 DEVMETHOD_END
237};
238
239static driver_t bcm_mbox_driver = {
240 "mbox",
241 bcm_mbox_methods,
242 sizeof(struct bcm_mbox_softc),
243};
244
245static devclass_t bcm_mbox_devclass;
246
247DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
248
| 134 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) {
135 device_set_desc(dev, "BCM2835 VideoCore Mailbox");
136 return(BUS_PROBE_DEFAULT);
137 }
138
139 return (ENXIO);
140}
141
142static int
143bcm_mbox_attach(device_t dev)
144{
145 struct bcm_mbox_softc *sc = device_get_softc(dev);
146 int i;
147 int rid = 0;
148
149 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
150 if (sc->mem_res == NULL) {
151 device_printf(dev, "could not allocate memory resource\n");
152 return (ENXIO);
153 }
154
155 sc->bst = rman_get_bustag(sc->mem_res);
156 sc->bsh = rman_get_bushandle(sc->mem_res);
157
158 rid = 0;
159 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
160 if (sc->irq_res == NULL) {
161 device_printf(dev, "could not allocate interrupt resource\n");
162 return (ENXIO);
163 }
164
165 /* Setup and enable the timer */
166 if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
167 NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
168 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
169 device_printf(dev, "Unable to setup the clock irq handler.\n");
170 return (ENXIO);
171 }
172
173 mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
174 for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
175 sc->valid[0] = 0;
176 sc->msg[0] = 0;
177 }
178
179 /* Read all pending messages */
180 bcm_mbox_intr(sc);
181
182 mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
183
184 return (0);
185}
186
187/*
188 * Mailbox API
189 */
190static int
191bcm_mbox_write(device_t dev, int chan, uint32_t data)
192{
193 int limit = 20000;
194 struct bcm_mbox_softc *sc = device_get_softc(dev);
195
196 dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
197 MBOX_LOCK(sc);
198
199 while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && limit--) {
200 DELAY(2);
201 }
202
203 if (limit == 0) {
204 printf("bcm_mbox_write: STATUS_FULL stuck");
205 MBOX_UNLOCK(sc);
206 return (EAGAIN);
207 }
208
209 mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
210
211 MBOX_UNLOCK(sc);
212 return (0);
213}
214
215static int
216bcm_mbox_read(device_t dev, int chan, uint32_t *data)
217{
218 struct bcm_mbox_softc *sc = device_get_softc(dev);
219
220 dprintf("bcm_mbox_read: chan %d\n", chan);
221 MBOX_LOCK(sc);
222 while (!sc->valid[chan])
223 msleep(&sc->msg[chan], &sc->lock, PZERO, "vcio mbox read", 0);
224 *data = sc->msg[chan];
225 sc->valid[chan] = 0;
226 MBOX_UNLOCK(sc);
227 dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
228
229 return (0);
230}
231
232static device_method_t bcm_mbox_methods[] = {
233 DEVMETHOD(device_probe, bcm_mbox_probe),
234 DEVMETHOD(device_attach, bcm_mbox_attach),
235
236 DEVMETHOD(mbox_read, bcm_mbox_read),
237 DEVMETHOD(mbox_write, bcm_mbox_write),
238
239 DEVMETHOD_END
240};
241
242static driver_t bcm_mbox_driver = {
243 "mbox",
244 bcm_mbox_methods,
245 sizeof(struct bcm_mbox_softc),
246};
247
248static devclass_t bcm_mbox_devclass;
249
250DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
251
|