29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/module.h>
36#include <sys/mutex.h>
37#include <sys/sx.h>
38#include <sys/rman.h>
39#include <machine/bus.h>
40
41#include <dev/ofw/ofw_bus.h>
42#include <dev/ofw/ofw_bus_subr.h>
43
44#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
45#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
46#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
47
48#include "mbox_if.h"
49
50#define REG_READ 0x00
51#define REG_POL 0x10
52#define REG_SENDER 0x14
53#define REG_STATUS 0x18
54#define STATUS_FULL 0x80000000
55#define STATUS_EMPTY 0x40000000
56#define REG_CONFIG 0x1C
57#define CONFIG_DATA_IRQ 0x00000001
58#define REG_WRITE 0x20 /* This is Mailbox 1 address */
59
60#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
61#define MBOX_CHAN(msg) ((msg) & 0xf)
62#define MBOX_DATA(msg) ((msg) & ~0xf)
63
64#define MBOX_LOCK(sc) do { \
65 mtx_lock(&(sc)->lock); \
66} while(0)
67
68#define MBOX_UNLOCK(sc) do { \
69 mtx_unlock(&(sc)->lock); \
70} while(0)
71
72#ifdef DEBUG
73#define dprintf(fmt, args...) printf(fmt, ##args)
74#else
75#define dprintf(fmt, args...)
76#endif
77
78struct bcm_mbox_softc {
79 struct mtx lock;
80 struct resource * mem_res;
81 struct resource * irq_res;
82 void* intr_hl;
83 bus_space_tag_t bst;
84 bus_space_handle_t bsh;
85 int msg[BCM2835_MBOX_CHANS];
86 int have_message[BCM2835_MBOX_CHANS];
87 struct sx property_chan_lock;
88};
89
90#define mbox_read_4(sc, reg) \
91 bus_space_read_4((sc)->bst, (sc)->bsh, reg)
92#define mbox_write_4(sc, reg, val) \
93 bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
94
95static int
96bcm_mbox_read_msg(struct bcm_mbox_softc *sc, int *ochan)
97{
98 uint32_t data;
99 uint32_t msg;
100 int chan;
101
102 msg = mbox_read_4(sc, REG_READ);
103 dprintf("bcm_mbox_intr: raw data %08x\n", msg);
104 chan = MBOX_CHAN(msg);
105 data = MBOX_DATA(msg);
106 if (sc->msg[chan]) {
107 printf("bcm_mbox_intr: channel %d oveflow\n", chan);
108 return (1);
109 }
110 dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
111 sc->msg[chan] = msg;
112
113 if (ochan != NULL)
114 *ochan = chan;
115
116 return (0);
117}
118
119static void
120bcm_mbox_intr(void *arg)
121{
122 struct bcm_mbox_softc *sc = arg;
123 int chan;
124
125 MBOX_LOCK(sc);
126 while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
127 if (bcm_mbox_read_msg(sc, &chan) == 0) {
128 sc->have_message[chan] = 1;
129 wakeup(&sc->have_message[chan]);
130 }
131 MBOX_UNLOCK(sc);
132}
133
134static int
135bcm_mbox_probe(device_t dev)
136{
137
138 if (!ofw_bus_status_okay(dev))
139 return (ENXIO);
140
141 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) {
142 device_set_desc(dev, "BCM2835 VideoCore Mailbox");
143 return(BUS_PROBE_DEFAULT);
144 }
145
146 return (ENXIO);
147}
148
149static int
150bcm_mbox_attach(device_t dev)
151{
152 struct bcm_mbox_softc *sc = device_get_softc(dev);
153 int i;
154 int rid = 0;
155
156 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
157 if (sc->mem_res == NULL) {
158 device_printf(dev, "could not allocate memory resource\n");
159 return (ENXIO);
160 }
161
162 sc->bst = rman_get_bustag(sc->mem_res);
163 sc->bsh = rman_get_bushandle(sc->mem_res);
164
165 rid = 0;
166 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
167 if (sc->irq_res == NULL) {
168 device_printf(dev, "could not allocate interrupt resource\n");
169 return (ENXIO);
170 }
171
172 /* Setup and enable the timer */
173 if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
174 NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
175 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
176 device_printf(dev, "Unable to setup the clock irq handler.\n");
177 return (ENXIO);
178 }
179
180 mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
181 for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
182 sc->msg[i] = 0;
183 sc->have_message[i] = 0;
184 }
185
186 sx_init(&sc->property_chan_lock, "mboxprop");
187
188 /* Read all pending messages */
189 while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0)
190 (void)mbox_read_4(sc, REG_READ);
191
192 mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
193
194 return (0);
195}
196
197/*
198 * Mailbox API
199 */
200static int
201bcm_mbox_write(device_t dev, int chan, uint32_t data)
202{
203 int limit = 1000;
204 struct bcm_mbox_softc *sc = device_get_softc(dev);
205
206 dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
207 MBOX_LOCK(sc);
208 sc->have_message[chan] = 0;
209 while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit)
210 DELAY(5);
211 if (limit == 0) {
212 printf("bcm_mbox_write: STATUS_FULL stuck");
213 MBOX_UNLOCK(sc);
214 return (EAGAIN);
215 }
216 mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
217 MBOX_UNLOCK(sc);
218
219 return (0);
220}
221
222static int
223bcm_mbox_read(device_t dev, int chan, uint32_t *data)
224{
225 struct bcm_mbox_softc *sc = device_get_softc(dev);
226 int err, read_chan;
227
228 dprintf("bcm_mbox_read: chan %d\n", chan);
229
230 err = 0;
231 MBOX_LOCK(sc);
232 if (!cold) {
233 if (sc->have_message[chan] == 0) {
234 if (mtx_sleep(&sc->have_message[chan], &sc->lock, 0,
235 "mbox", 10*hz) != 0) {
236 device_printf(dev, "timeout waiting for message on chan %d\n", chan);
237 err = ETIMEDOUT;
238 }
239 }
240 } else {
241 do {
242 /* Wait for a message */
243 while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
244 ;
245 /* Read the message */
246 if (bcm_mbox_read_msg(sc, &read_chan) != 0) {
247 err = EINVAL;
248 goto out;
249 }
250 } while (read_chan != chan);
251 }
252 /*
253 * get data from intr handler, the same channel is never coming
254 * because of holding sc lock.
255 */
256 *data = MBOX_DATA(sc->msg[chan]);
257 sc->msg[chan] = 0;
258 sc->have_message[chan] = 0;
259out:
260 MBOX_UNLOCK(sc);
261 dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
262
263 return (err);
264}
265
266static device_method_t bcm_mbox_methods[] = {
267 DEVMETHOD(device_probe, bcm_mbox_probe),
268 DEVMETHOD(device_attach, bcm_mbox_attach),
269
270 DEVMETHOD(mbox_read, bcm_mbox_read),
271 DEVMETHOD(mbox_write, bcm_mbox_write),
272
273 DEVMETHOD_END
274};
275
276static driver_t bcm_mbox_driver = {
277 "mbox",
278 bcm_mbox_methods,
279 sizeof(struct bcm_mbox_softc),
280};
281
282static devclass_t bcm_mbox_devclass;
283
284DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
285
286static void
287bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
288{
289 bus_addr_t *addr;
290
291 if (err)
292 return;
293 addr = (bus_addr_t *)arg;
294 *addr = PHYS_TO_VCBUS(segs[0].ds_addr);
295}
296
297static void *
298bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
299 bus_dmamap_t *map, bus_addr_t *phys)
300{
301 void *buf;
302 int err;
303
304 err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
305 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
306 len, 1, len, 0, NULL, NULL, tag);
307 if (err != 0) {
308 device_printf(dev, "can't create DMA tag\n");
309 return (NULL);
310 }
311
312 err = bus_dmamem_alloc(*tag, &buf, 0, map);
313 if (err != 0) {
314 bus_dma_tag_destroy(*tag);
315 device_printf(dev, "can't allocate dmamem\n");
316 return (NULL);
317 }
318
319 err = bus_dmamap_load(*tag, *map, buf, len, bcm2835_mbox_dma_cb,
320 phys, 0);
321 if (err != 0) {
322 bus_dmamem_free(*tag, buf, *map);
323 bus_dma_tag_destroy(*tag);
324 device_printf(dev, "can't load DMA map\n");
325 return (NULL);
326 }
327
328 return (buf);
329}
330
331static int
332bcm2835_mbox_err(device_t dev, bus_addr_t msg_phys, uint32_t resp_phys,
333 struct bcm2835_mbox_hdr *msg, size_t len)
334{
335 int idx;
336 struct bcm2835_mbox_tag_hdr *tag;
337 uint8_t *last;
338
339 if ((uint32_t)msg_phys != resp_phys) {
340 device_printf(dev, "response channel mismatch\n");
341 return (EIO);
342 }
343 if (msg->code != BCM2835_MBOX_CODE_RESP_SUCCESS) {
344 device_printf(dev, "mbox response error\n");
345 return (EIO);
346 }
347
348 /* Loop until the end tag. */
349 tag = (struct bcm2835_mbox_tag_hdr *)(msg + 1);
350 last = (uint8_t *)msg + len;
351 for (idx = 0; tag->tag != 0; idx++) {
352 if ((tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE) == 0) {
353 device_printf(dev, "tag %d response error\n", idx);
354 return (EIO);
355 }
356 /* Clear the response bit. */
357 tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
358
359 /* Next tag. */
360 tag = (struct bcm2835_mbox_tag_hdr *)((uint8_t *)tag +
361 sizeof(*tag) + tag->val_buf_size);
362
363 if ((uint8_t *)tag > last) {
364 device_printf(dev, "mbox buffer size error\n");
365 return (EIO);
366 }
367 }
368
369 return (0);
370}
371
372int
373bcm2835_mbox_property(void *msg, size_t msg_size)
374{
375 struct bcm_mbox_softc *sc;
376 struct msg_set_power_state *buf;
377 bus_dma_tag_t msg_tag;
378 bus_dmamap_t msg_map;
379 bus_addr_t msg_phys;
380 uint32_t reg;
381 device_t mbox;
382 int err;
383
384 /* get mbox device */
385 mbox = devclass_get_device(devclass_find("mbox"), 0);
386 if (mbox == NULL)
387 return (ENXIO);
388
389 sc = device_get_softc(mbox);
390 sx_xlock(&sc->property_chan_lock);
391
392 /* Allocate memory for the message */
393 buf = bcm2835_mbox_init_dma(mbox, msg_size, &msg_tag, &msg_map,
394 &msg_phys);
395 if (buf == NULL) {
396 err = ENOMEM;
397 goto out;
398 }
399
400 memcpy(buf, msg, msg_size);
401
402 bus_dmamap_sync(msg_tag, msg_map,
403 BUS_DMASYNC_PREWRITE);
404
405 MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_PROP, (uint32_t)msg_phys);
406 MBOX_READ(mbox, BCM2835_MBOX_CHAN_PROP, ®);
407
408 bus_dmamap_sync(msg_tag, msg_map,
409 BUS_DMASYNC_PREREAD);
410
411 memcpy(msg, buf, msg_size);
412
413 err = bcm2835_mbox_err(mbox, msg_phys, reg,
414 (struct bcm2835_mbox_hdr *)msg, msg_size);
415
416 bus_dmamap_unload(msg_tag, msg_map);
417 bus_dmamem_free(msg_tag, buf, msg_map);
418 bus_dma_tag_destroy(msg_tag);
419out:
420 sx_xunlock(&sc->property_chan_lock);
421 return (err);
422}
423
424int
425bcm2835_mbox_set_power_state(uint32_t device_id, boolean_t on)
426{
427 struct msg_set_power_state msg;
428 int err;
429
430 memset(&msg, 0, sizeof(msg));
431 msg.hdr.buf_size = sizeof(msg);
432 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
433 msg.tag_hdr.tag = BCM2835_MBOX_TAG_SET_POWER_STATE;
434 msg.tag_hdr.val_buf_size = sizeof(msg.body);
435 msg.tag_hdr.val_len = sizeof(msg.body.req);
436 msg.body.req.device_id = device_id;
437 msg.body.req.state = (on ? BCM2835_MBOX_POWER_ON : 0) |
438 BCM2835_MBOX_POWER_WAIT;
439 msg.end_tag = 0;
440
441 err = bcm2835_mbox_property(&msg, sizeof(msg));
442
443 return (err);
444}
445
446int
447bcm2835_mbox_get_clock_rate(uint32_t clock_id, uint32_t *hz)
448{
449 struct msg_get_clock_rate msg;
450 int err;
451
452 memset(&msg, 0, sizeof(msg));
453 msg.hdr.buf_size = sizeof(msg);
454 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
455 msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
456 msg.tag_hdr.val_buf_size = sizeof(msg.body);
457 msg.tag_hdr.val_len = sizeof(msg.body.req);
458 msg.body.req.clock_id = clock_id;
459 msg.end_tag = 0;
460
461 err = bcm2835_mbox_property(&msg, sizeof(msg));
462 *hz = msg.body.resp.rate_hz;
463
464 return (err);
465}
466
467int
468bcm2835_mbox_fb_get_w_h(struct bcm2835_fb_config *fb)
469{
470 int err;
471 struct msg_fb_get_w_h msg;
472
473 memset(&msg, 0, sizeof(msg));
474 msg.hdr.buf_size = sizeof(msg);
475 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
476 BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, GET_PHYSICAL_W_H);
477 msg.physical_w_h.tag_hdr.val_len = 0;
| 29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/lock.h>
35#include <sys/module.h>
36#include <sys/mutex.h>
37#include <sys/sx.h>
38#include <sys/rman.h>
39#include <machine/bus.h>
40
41#include <dev/ofw/ofw_bus.h>
42#include <dev/ofw/ofw_bus_subr.h>
43
44#include <arm/broadcom/bcm2835/bcm2835_mbox.h>
45#include <arm/broadcom/bcm2835/bcm2835_mbox_prop.h>
46#include <arm/broadcom/bcm2835/bcm2835_vcbus.h>
47
48#include "mbox_if.h"
49
50#define REG_READ 0x00
51#define REG_POL 0x10
52#define REG_SENDER 0x14
53#define REG_STATUS 0x18
54#define STATUS_FULL 0x80000000
55#define STATUS_EMPTY 0x40000000
56#define REG_CONFIG 0x1C
57#define CONFIG_DATA_IRQ 0x00000001
58#define REG_WRITE 0x20 /* This is Mailbox 1 address */
59
60#define MBOX_MSG(chan, data) (((data) & ~0xf) | ((chan) & 0xf))
61#define MBOX_CHAN(msg) ((msg) & 0xf)
62#define MBOX_DATA(msg) ((msg) & ~0xf)
63
64#define MBOX_LOCK(sc) do { \
65 mtx_lock(&(sc)->lock); \
66} while(0)
67
68#define MBOX_UNLOCK(sc) do { \
69 mtx_unlock(&(sc)->lock); \
70} while(0)
71
72#ifdef DEBUG
73#define dprintf(fmt, args...) printf(fmt, ##args)
74#else
75#define dprintf(fmt, args...)
76#endif
77
78struct bcm_mbox_softc {
79 struct mtx lock;
80 struct resource * mem_res;
81 struct resource * irq_res;
82 void* intr_hl;
83 bus_space_tag_t bst;
84 bus_space_handle_t bsh;
85 int msg[BCM2835_MBOX_CHANS];
86 int have_message[BCM2835_MBOX_CHANS];
87 struct sx property_chan_lock;
88};
89
90#define mbox_read_4(sc, reg) \
91 bus_space_read_4((sc)->bst, (sc)->bsh, reg)
92#define mbox_write_4(sc, reg, val) \
93 bus_space_write_4((sc)->bst, (sc)->bsh, reg, val)
94
95static int
96bcm_mbox_read_msg(struct bcm_mbox_softc *sc, int *ochan)
97{
98 uint32_t data;
99 uint32_t msg;
100 int chan;
101
102 msg = mbox_read_4(sc, REG_READ);
103 dprintf("bcm_mbox_intr: raw data %08x\n", msg);
104 chan = MBOX_CHAN(msg);
105 data = MBOX_DATA(msg);
106 if (sc->msg[chan]) {
107 printf("bcm_mbox_intr: channel %d oveflow\n", chan);
108 return (1);
109 }
110 dprintf("bcm_mbox_intr: chan %d, data %08x\n", chan, data);
111 sc->msg[chan] = msg;
112
113 if (ochan != NULL)
114 *ochan = chan;
115
116 return (0);
117}
118
119static void
120bcm_mbox_intr(void *arg)
121{
122 struct bcm_mbox_softc *sc = arg;
123 int chan;
124
125 MBOX_LOCK(sc);
126 while (!(mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
127 if (bcm_mbox_read_msg(sc, &chan) == 0) {
128 sc->have_message[chan] = 1;
129 wakeup(&sc->have_message[chan]);
130 }
131 MBOX_UNLOCK(sc);
132}
133
134static int
135bcm_mbox_probe(device_t dev)
136{
137
138 if (!ofw_bus_status_okay(dev))
139 return (ENXIO);
140
141 if (ofw_bus_is_compatible(dev, "broadcom,bcm2835-mbox")) {
142 device_set_desc(dev, "BCM2835 VideoCore Mailbox");
143 return(BUS_PROBE_DEFAULT);
144 }
145
146 return (ENXIO);
147}
148
149static int
150bcm_mbox_attach(device_t dev)
151{
152 struct bcm_mbox_softc *sc = device_get_softc(dev);
153 int i;
154 int rid = 0;
155
156 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
157 if (sc->mem_res == NULL) {
158 device_printf(dev, "could not allocate memory resource\n");
159 return (ENXIO);
160 }
161
162 sc->bst = rman_get_bustag(sc->mem_res);
163 sc->bsh = rman_get_bushandle(sc->mem_res);
164
165 rid = 0;
166 sc->irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, RF_ACTIVE);
167 if (sc->irq_res == NULL) {
168 device_printf(dev, "could not allocate interrupt resource\n");
169 return (ENXIO);
170 }
171
172 /* Setup and enable the timer */
173 if (bus_setup_intr(dev, sc->irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
174 NULL, bcm_mbox_intr, sc, &sc->intr_hl) != 0) {
175 bus_release_resource(dev, SYS_RES_IRQ, rid, sc->irq_res);
176 device_printf(dev, "Unable to setup the clock irq handler.\n");
177 return (ENXIO);
178 }
179
180 mtx_init(&sc->lock, "vcio mbox", NULL, MTX_DEF);
181 for (i = 0; i < BCM2835_MBOX_CHANS; i++) {
182 sc->msg[i] = 0;
183 sc->have_message[i] = 0;
184 }
185
186 sx_init(&sc->property_chan_lock, "mboxprop");
187
188 /* Read all pending messages */
189 while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY) == 0)
190 (void)mbox_read_4(sc, REG_READ);
191
192 mbox_write_4(sc, REG_CONFIG, CONFIG_DATA_IRQ);
193
194 return (0);
195}
196
197/*
198 * Mailbox API
199 */
200static int
201bcm_mbox_write(device_t dev, int chan, uint32_t data)
202{
203 int limit = 1000;
204 struct bcm_mbox_softc *sc = device_get_softc(dev);
205
206 dprintf("bcm_mbox_write: chan %d, data %08x\n", chan, data);
207 MBOX_LOCK(sc);
208 sc->have_message[chan] = 0;
209 while ((mbox_read_4(sc, REG_STATUS) & STATUS_FULL) && --limit)
210 DELAY(5);
211 if (limit == 0) {
212 printf("bcm_mbox_write: STATUS_FULL stuck");
213 MBOX_UNLOCK(sc);
214 return (EAGAIN);
215 }
216 mbox_write_4(sc, REG_WRITE, MBOX_MSG(chan, data));
217 MBOX_UNLOCK(sc);
218
219 return (0);
220}
221
222static int
223bcm_mbox_read(device_t dev, int chan, uint32_t *data)
224{
225 struct bcm_mbox_softc *sc = device_get_softc(dev);
226 int err, read_chan;
227
228 dprintf("bcm_mbox_read: chan %d\n", chan);
229
230 err = 0;
231 MBOX_LOCK(sc);
232 if (!cold) {
233 if (sc->have_message[chan] == 0) {
234 if (mtx_sleep(&sc->have_message[chan], &sc->lock, 0,
235 "mbox", 10*hz) != 0) {
236 device_printf(dev, "timeout waiting for message on chan %d\n", chan);
237 err = ETIMEDOUT;
238 }
239 }
240 } else {
241 do {
242 /* Wait for a message */
243 while ((mbox_read_4(sc, REG_STATUS) & STATUS_EMPTY))
244 ;
245 /* Read the message */
246 if (bcm_mbox_read_msg(sc, &read_chan) != 0) {
247 err = EINVAL;
248 goto out;
249 }
250 } while (read_chan != chan);
251 }
252 /*
253 * get data from intr handler, the same channel is never coming
254 * because of holding sc lock.
255 */
256 *data = MBOX_DATA(sc->msg[chan]);
257 sc->msg[chan] = 0;
258 sc->have_message[chan] = 0;
259out:
260 MBOX_UNLOCK(sc);
261 dprintf("bcm_mbox_read: chan %d, data %08x\n", chan, *data);
262
263 return (err);
264}
265
266static device_method_t bcm_mbox_methods[] = {
267 DEVMETHOD(device_probe, bcm_mbox_probe),
268 DEVMETHOD(device_attach, bcm_mbox_attach),
269
270 DEVMETHOD(mbox_read, bcm_mbox_read),
271 DEVMETHOD(mbox_write, bcm_mbox_write),
272
273 DEVMETHOD_END
274};
275
276static driver_t bcm_mbox_driver = {
277 "mbox",
278 bcm_mbox_methods,
279 sizeof(struct bcm_mbox_softc),
280};
281
282static devclass_t bcm_mbox_devclass;
283
284DRIVER_MODULE(mbox, simplebus, bcm_mbox_driver, bcm_mbox_devclass, 0, 0);
285
286static void
287bcm2835_mbox_dma_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
288{
289 bus_addr_t *addr;
290
291 if (err)
292 return;
293 addr = (bus_addr_t *)arg;
294 *addr = PHYS_TO_VCBUS(segs[0].ds_addr);
295}
296
297static void *
298bcm2835_mbox_init_dma(device_t dev, size_t len, bus_dma_tag_t *tag,
299 bus_dmamap_t *map, bus_addr_t *phys)
300{
301 void *buf;
302 int err;
303
304 err = bus_dma_tag_create(bus_get_dma_tag(dev), 16, 0,
305 BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
306 len, 1, len, 0, NULL, NULL, tag);
307 if (err != 0) {
308 device_printf(dev, "can't create DMA tag\n");
309 return (NULL);
310 }
311
312 err = bus_dmamem_alloc(*tag, &buf, 0, map);
313 if (err != 0) {
314 bus_dma_tag_destroy(*tag);
315 device_printf(dev, "can't allocate dmamem\n");
316 return (NULL);
317 }
318
319 err = bus_dmamap_load(*tag, *map, buf, len, bcm2835_mbox_dma_cb,
320 phys, 0);
321 if (err != 0) {
322 bus_dmamem_free(*tag, buf, *map);
323 bus_dma_tag_destroy(*tag);
324 device_printf(dev, "can't load DMA map\n");
325 return (NULL);
326 }
327
328 return (buf);
329}
330
331static int
332bcm2835_mbox_err(device_t dev, bus_addr_t msg_phys, uint32_t resp_phys,
333 struct bcm2835_mbox_hdr *msg, size_t len)
334{
335 int idx;
336 struct bcm2835_mbox_tag_hdr *tag;
337 uint8_t *last;
338
339 if ((uint32_t)msg_phys != resp_phys) {
340 device_printf(dev, "response channel mismatch\n");
341 return (EIO);
342 }
343 if (msg->code != BCM2835_MBOX_CODE_RESP_SUCCESS) {
344 device_printf(dev, "mbox response error\n");
345 return (EIO);
346 }
347
348 /* Loop until the end tag. */
349 tag = (struct bcm2835_mbox_tag_hdr *)(msg + 1);
350 last = (uint8_t *)msg + len;
351 for (idx = 0; tag->tag != 0; idx++) {
352 if ((tag->val_len & BCM2835_MBOX_TAG_VAL_LEN_RESPONSE) == 0) {
353 device_printf(dev, "tag %d response error\n", idx);
354 return (EIO);
355 }
356 /* Clear the response bit. */
357 tag->val_len &= ~BCM2835_MBOX_TAG_VAL_LEN_RESPONSE;
358
359 /* Next tag. */
360 tag = (struct bcm2835_mbox_tag_hdr *)((uint8_t *)tag +
361 sizeof(*tag) + tag->val_buf_size);
362
363 if ((uint8_t *)tag > last) {
364 device_printf(dev, "mbox buffer size error\n");
365 return (EIO);
366 }
367 }
368
369 return (0);
370}
371
372int
373bcm2835_mbox_property(void *msg, size_t msg_size)
374{
375 struct bcm_mbox_softc *sc;
376 struct msg_set_power_state *buf;
377 bus_dma_tag_t msg_tag;
378 bus_dmamap_t msg_map;
379 bus_addr_t msg_phys;
380 uint32_t reg;
381 device_t mbox;
382 int err;
383
384 /* get mbox device */
385 mbox = devclass_get_device(devclass_find("mbox"), 0);
386 if (mbox == NULL)
387 return (ENXIO);
388
389 sc = device_get_softc(mbox);
390 sx_xlock(&sc->property_chan_lock);
391
392 /* Allocate memory for the message */
393 buf = bcm2835_mbox_init_dma(mbox, msg_size, &msg_tag, &msg_map,
394 &msg_phys);
395 if (buf == NULL) {
396 err = ENOMEM;
397 goto out;
398 }
399
400 memcpy(buf, msg, msg_size);
401
402 bus_dmamap_sync(msg_tag, msg_map,
403 BUS_DMASYNC_PREWRITE);
404
405 MBOX_WRITE(mbox, BCM2835_MBOX_CHAN_PROP, (uint32_t)msg_phys);
406 MBOX_READ(mbox, BCM2835_MBOX_CHAN_PROP, ®);
407
408 bus_dmamap_sync(msg_tag, msg_map,
409 BUS_DMASYNC_PREREAD);
410
411 memcpy(msg, buf, msg_size);
412
413 err = bcm2835_mbox_err(mbox, msg_phys, reg,
414 (struct bcm2835_mbox_hdr *)msg, msg_size);
415
416 bus_dmamap_unload(msg_tag, msg_map);
417 bus_dmamem_free(msg_tag, buf, msg_map);
418 bus_dma_tag_destroy(msg_tag);
419out:
420 sx_xunlock(&sc->property_chan_lock);
421 return (err);
422}
423
424int
425bcm2835_mbox_set_power_state(uint32_t device_id, boolean_t on)
426{
427 struct msg_set_power_state msg;
428 int err;
429
430 memset(&msg, 0, sizeof(msg));
431 msg.hdr.buf_size = sizeof(msg);
432 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
433 msg.tag_hdr.tag = BCM2835_MBOX_TAG_SET_POWER_STATE;
434 msg.tag_hdr.val_buf_size = sizeof(msg.body);
435 msg.tag_hdr.val_len = sizeof(msg.body.req);
436 msg.body.req.device_id = device_id;
437 msg.body.req.state = (on ? BCM2835_MBOX_POWER_ON : 0) |
438 BCM2835_MBOX_POWER_WAIT;
439 msg.end_tag = 0;
440
441 err = bcm2835_mbox_property(&msg, sizeof(msg));
442
443 return (err);
444}
445
446int
447bcm2835_mbox_get_clock_rate(uint32_t clock_id, uint32_t *hz)
448{
449 struct msg_get_clock_rate msg;
450 int err;
451
452 memset(&msg, 0, sizeof(msg));
453 msg.hdr.buf_size = sizeof(msg);
454 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
455 msg.tag_hdr.tag = BCM2835_MBOX_TAG_GET_CLOCK_RATE;
456 msg.tag_hdr.val_buf_size = sizeof(msg.body);
457 msg.tag_hdr.val_len = sizeof(msg.body.req);
458 msg.body.req.clock_id = clock_id;
459 msg.end_tag = 0;
460
461 err = bcm2835_mbox_property(&msg, sizeof(msg));
462 *hz = msg.body.resp.rate_hz;
463
464 return (err);
465}
466
467int
468bcm2835_mbox_fb_get_w_h(struct bcm2835_fb_config *fb)
469{
470 int err;
471 struct msg_fb_get_w_h msg;
472
473 memset(&msg, 0, sizeof(msg));
474 msg.hdr.buf_size = sizeof(msg);
475 msg.hdr.code = BCM2835_MBOX_CODE_REQ;
476 BCM2835_MBOX_INIT_TAG(&msg.physical_w_h, GET_PHYSICAL_W_H);
477 msg.physical_w_h.tag_hdr.val_len = 0;
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