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V4L/DVB (6715): ivtv: Remove unnecessary register update
[linux-2.6/verdex.git] / drivers / media / video / ivtv / ivtv-mailbox.c
blobb05436da7136d04ec422e0c7c31d3ebd3abbefa8
1 /*
2 mailbox functions
3 Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
4 Copyright (C) 2004 Chris Kennedy <c@groovy.org>
5 Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <stdarg.h>
23
24 #include "ivtv-driver.h"
25 #include "ivtv-mailbox.h"
26
27 /* Firmware mailbox flags*/
28 #define IVTV_MBOX_FIRMWARE_DONE 0x00000004
29 #define IVTV_MBOX_DRIVER_DONE 0x00000002
30 #define IVTV_MBOX_DRIVER_BUSY 0x00000001
31 #define IVTV_MBOX_FREE 0x00000000
32
33 /* Firmware mailbox standard timeout */
34 #define IVTV_API_STD_TIMEOUT 0x02000000
35
36 #define API_CACHE (1 << 0) /* Allow the command to be stored in the cache */
37 #define API_RESULT (1 << 1) /* Allow 1 second for this cmd to end */
38 #define API_FAST_RESULT (3 << 1) /* Allow 0.1 second for this cmd to end */
39 #define API_DMA (1 << 3) /* DMA mailbox, has special handling */
40 #define API_HIGH_VOL (1 << 5) /* High volume command (i.e. called during encoding or decoding) */
41 #define API_NO_WAIT_MB (1 << 4) /* Command may not wait for a free mailbox */
42 #define API_NO_WAIT_RES (1 << 5) /* Command may not wait for the result */
43 #define API_NO_POLL (1 << 6) /* Avoid pointless polling */
44
45 struct ivtv_api_info {
46 int flags; /* Flags, see above */
47 const char *name; /* The name of the command */
48 };
49
50 #define API_ENTRY(x, f) [x] = { (f), #x }
51
52 static const struct ivtv_api_info api_info[256] = {
53 /* MPEG encoder API */
54 API_ENTRY(CX2341X_ENC_PING_FW, API_FAST_RESULT),
55 API_ENTRY(CX2341X_ENC_START_CAPTURE, API_RESULT | API_NO_POLL),
56 API_ENTRY(CX2341X_ENC_STOP_CAPTURE, API_RESULT),
57 API_ENTRY(CX2341X_ENC_SET_AUDIO_ID, API_CACHE),
58 API_ENTRY(CX2341X_ENC_SET_VIDEO_ID, API_CACHE),
59 API_ENTRY(CX2341X_ENC_SET_PCR_ID, API_CACHE),
60 API_ENTRY(CX2341X_ENC_SET_FRAME_RATE, API_CACHE),
61 API_ENTRY(CX2341X_ENC_SET_FRAME_SIZE, API_CACHE),
62 API_ENTRY(CX2341X_ENC_SET_BIT_RATE, API_CACHE),
63 API_ENTRY(CX2341X_ENC_SET_GOP_PROPERTIES, API_CACHE),
64 API_ENTRY(CX2341X_ENC_SET_ASPECT_RATIO, API_CACHE),
65 API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_MODE, API_CACHE),
66 API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_PROPS, API_CACHE),
67 API_ENTRY(CX2341X_ENC_SET_CORING_LEVELS, API_CACHE),
68 API_ENTRY(CX2341X_ENC_SET_SPATIAL_FILTER_TYPE, API_CACHE),
69 API_ENTRY(CX2341X_ENC_SET_VBI_LINE, API_RESULT),
70 API_ENTRY(CX2341X_ENC_SET_STREAM_TYPE, API_CACHE),
71 API_ENTRY(CX2341X_ENC_SET_OUTPUT_PORT, API_CACHE),
72 API_ENTRY(CX2341X_ENC_SET_AUDIO_PROPERTIES, API_CACHE),
73 API_ENTRY(CX2341X_ENC_HALT_FW, API_FAST_RESULT),
74 API_ENTRY(CX2341X_ENC_GET_VERSION, API_FAST_RESULT),
75 API_ENTRY(CX2341X_ENC_SET_GOP_CLOSURE, API_CACHE),
76 API_ENTRY(CX2341X_ENC_GET_SEQ_END, API_RESULT),
77 API_ENTRY(CX2341X_ENC_SET_PGM_INDEX_INFO, API_FAST_RESULT),
78 API_ENTRY(CX2341X_ENC_SET_VBI_CONFIG, API_RESULT),
79 API_ENTRY(CX2341X_ENC_SET_DMA_BLOCK_SIZE, API_CACHE),
80 API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_10, API_FAST_RESULT),
81 API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_9, API_FAST_RESULT),
82 API_ENTRY(CX2341X_ENC_SCHED_DMA_TO_HOST, API_DMA | API_HIGH_VOL),
83 API_ENTRY(CX2341X_ENC_INITIALIZE_INPUT, API_RESULT),
84 API_ENTRY(CX2341X_ENC_SET_FRAME_DROP_RATE, API_CACHE),
85 API_ENTRY(CX2341X_ENC_PAUSE_ENCODER, API_RESULT),
86 API_ENTRY(CX2341X_ENC_REFRESH_INPUT, API_NO_WAIT_MB | API_HIGH_VOL),
87 API_ENTRY(CX2341X_ENC_SET_COPYRIGHT, API_CACHE),
88 API_ENTRY(CX2341X_ENC_SET_EVENT_NOTIFICATION, API_RESULT),
89 API_ENTRY(CX2341X_ENC_SET_NUM_VSYNC_LINES, API_CACHE),
90 API_ENTRY(CX2341X_ENC_SET_PLACEHOLDER, API_CACHE),
91 API_ENTRY(CX2341X_ENC_MUTE_VIDEO, API_RESULT),
92 API_ENTRY(CX2341X_ENC_MUTE_AUDIO, API_RESULT),
93 API_ENTRY(CX2341X_ENC_SET_VERT_CROP_LINE, API_FAST_RESULT),
94 API_ENTRY(CX2341X_ENC_MISC, API_FAST_RESULT),
95 /* Obsolete PULLDOWN API command */
96 API_ENTRY(0xb1, API_CACHE),
97
98 /* MPEG decoder API */
99 API_ENTRY(CX2341X_DEC_PING_FW, API_FAST_RESULT),
100 API_ENTRY(CX2341X_DEC_START_PLAYBACK, API_RESULT | API_NO_POLL),
101 API_ENTRY(CX2341X_DEC_STOP_PLAYBACK, API_RESULT),
102 API_ENTRY(CX2341X_DEC_SET_PLAYBACK_SPEED, API_RESULT),
103 API_ENTRY(CX2341X_DEC_STEP_VIDEO, API_RESULT),
104 API_ENTRY(CX2341X_DEC_SET_DMA_BLOCK_SIZE, API_CACHE),
105 API_ENTRY(CX2341X_DEC_GET_XFER_INFO, API_FAST_RESULT),
106 API_ENTRY(CX2341X_DEC_GET_DMA_STATUS, API_FAST_RESULT),
107 API_ENTRY(CX2341X_DEC_SCHED_DMA_FROM_HOST, API_DMA | API_HIGH_VOL),
108 API_ENTRY(CX2341X_DEC_PAUSE_PLAYBACK, API_RESULT),
109 API_ENTRY(CX2341X_DEC_HALT_FW, API_FAST_RESULT),
110 API_ENTRY(CX2341X_DEC_SET_STANDARD, API_CACHE),
111 API_ENTRY(CX2341X_DEC_GET_VERSION, API_FAST_RESULT),
112 API_ENTRY(CX2341X_DEC_SET_STREAM_INPUT, API_CACHE),
113 API_ENTRY(CX2341X_DEC_GET_TIMING_INFO, API_RESULT /*| API_NO_WAIT_RES*/),
114 API_ENTRY(CX2341X_DEC_SET_AUDIO_MODE, API_CACHE),
115 API_ENTRY(CX2341X_DEC_SET_EVENT_NOTIFICATION, API_RESULT),
116 API_ENTRY(CX2341X_DEC_SET_DISPLAY_BUFFERS, API_CACHE),
117 API_ENTRY(CX2341X_DEC_EXTRACT_VBI, API_RESULT),
118 API_ENTRY(CX2341X_DEC_SET_DECODER_SOURCE, API_FAST_RESULT),
119 API_ENTRY(CX2341X_DEC_SET_PREBUFFERING, API_CACHE),
120
121 /* OSD API */
122 API_ENTRY(CX2341X_OSD_GET_FRAMEBUFFER, API_FAST_RESULT),
123 API_ENTRY(CX2341X_OSD_GET_PIXEL_FORMAT, API_FAST_RESULT),
124 API_ENTRY(CX2341X_OSD_SET_PIXEL_FORMAT, API_CACHE),
125 API_ENTRY(CX2341X_OSD_GET_STATE, API_FAST_RESULT),
126 API_ENTRY(CX2341X_OSD_SET_STATE, API_CACHE),
127 API_ENTRY(CX2341X_OSD_GET_OSD_COORDS, API_FAST_RESULT),
128 API_ENTRY(CX2341X_OSD_SET_OSD_COORDS, API_CACHE),
129 API_ENTRY(CX2341X_OSD_GET_SCREEN_COORDS, API_FAST_RESULT),
130 API_ENTRY(CX2341X_OSD_SET_SCREEN_COORDS, API_CACHE),
131 API_ENTRY(CX2341X_OSD_GET_GLOBAL_ALPHA, API_FAST_RESULT),
132 API_ENTRY(CX2341X_OSD_SET_GLOBAL_ALPHA, API_CACHE),
133 API_ENTRY(CX2341X_OSD_SET_BLEND_COORDS, API_CACHE),
134 API_ENTRY(CX2341X_OSD_GET_FLICKER_STATE, API_FAST_RESULT),
135 API_ENTRY(CX2341X_OSD_SET_FLICKER_STATE, API_CACHE),
136 API_ENTRY(CX2341X_OSD_BLT_COPY, API_RESULT),
137 API_ENTRY(CX2341X_OSD_BLT_FILL, API_RESULT),
138 API_ENTRY(CX2341X_OSD_BLT_TEXT, API_RESULT),
139 API_ENTRY(CX2341X_OSD_SET_FRAMEBUFFER_WINDOW, API_CACHE),
140 API_ENTRY(CX2341X_OSD_SET_CHROMA_KEY, API_CACHE),
141 API_ENTRY(CX2341X_OSD_GET_ALPHA_CONTENT_INDEX, API_FAST_RESULT),
142 API_ENTRY(CX2341X_OSD_SET_ALPHA_CONTENT_INDEX, API_CACHE)
143 };
144
145 static int try_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int mb)
146 {
147 u32 flags = readl(&mbdata->mbox[mb].flags);
148 int is_free = flags == IVTV_MBOX_FREE || (flags & IVTV_MBOX_FIRMWARE_DONE);
149
150 /* if the mailbox is free, then try to claim it */
151 if (is_free && !test_and_set_bit(mb, &mbdata->busy)) {
152 write_sync(IVTV_MBOX_DRIVER_BUSY, &mbdata->mbox[mb].flags);
153 return 1;
154 }
155 return 0;
156 }
157
158 /* Try to find a free mailbox. Note mailbox 0 is reserved for DMA and so is not
159 attempted here. */
160 static int get_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int flags)
161 {
162 unsigned long then = jiffies;
163 int i, mb;
164 int max_mbox = mbdata->max_mbox;
165 int retries = 100;
166
167 /* All slow commands use the same mailbox, serializing them and also
168 leaving the other mailbox free for simple fast commands. */
169 if ((flags & API_FAST_RESULT) == API_RESULT)
170 max_mbox = 1;
171
172 /* find free non-DMA mailbox */
173 for (i = 0; i < retries; i++) {
174 for (mb = 1; mb <= max_mbox; mb++)
175 if (try_mailbox(itv, mbdata, mb))
176 return mb;
177
178 /* Sleep before a retry, if not atomic */
179 if (!(flags & API_NO_WAIT_MB)) {
180 if (jiffies - then > msecs_to_jiffies(10*retries))
181 break;
182 ivtv_msleep_timeout(10, 0);
183 }
184 }
185 return -ENODEV;
186 }
187
188 static void write_mailbox(volatile struct ivtv_mailbox __iomem *mbox, int cmd, int args, u32 data[])
189 {
190 int i;
191
192 write_sync(cmd, &mbox->cmd);
193 write_sync(IVTV_API_STD_TIMEOUT, &mbox->timeout);
194
195 for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
196 write_sync(data[i], &mbox->data[i]);
197
198 write_sync(IVTV_MBOX_DRIVER_DONE | IVTV_MBOX_DRIVER_BUSY, &mbox->flags);
199 }
200
201 static void clear_all_mailboxes(struct ivtv *itv, struct ivtv_mailbox_data *mbdata)
202 {
203 int i;
204
205 for (i = 0; i <= mbdata->max_mbox; i++) {
206 IVTV_DEBUG_WARN("Clearing mailbox %d: cmd 0x%08x flags 0x%08x\n",
207 i, readl(&mbdata->mbox[i].cmd), readl(&mbdata->mbox[i].flags));
208 write_sync(0, &mbdata->mbox[i].flags);
209 clear_bit(i, &mbdata->busy);
210 }
211 }
212
213 static int ivtv_api_call(struct ivtv *itv, int cmd, int args, u32 data[])
214 {
215 struct ivtv_mailbox_data *mbdata = (cmd >= 128) ? &itv->enc_mbox : &itv->dec_mbox;
216 volatile struct ivtv_mailbox __iomem *mbox;
217 int api_timeout = msecs_to_jiffies(1000);
218 int flags, mb, i;
219 unsigned long then;
220
221 /* sanity checks */
222 if (NULL == mbdata) {
223 IVTV_ERR("No mailbox allocated\n");
224 return -ENODEV;
225 }
226 if (args < 0 || args > CX2341X_MBOX_MAX_DATA ||
227 cmd < 0 || cmd > 255 || api_info[cmd].name == NULL) {
228 IVTV_ERR("Invalid MB call: cmd = 0x%02x, args = %d\n", cmd, args);
229 return -EINVAL;
230 }
231
232 if (api_info[cmd].flags & API_HIGH_VOL) {
233 IVTV_DEBUG_HI_MB("MB Call: %s\n", api_info[cmd].name);
234 }
235 else {
236 IVTV_DEBUG_MB("MB Call: %s\n", api_info[cmd].name);
237 }
238
239 /* clear possibly uninitialized part of data array */
240 for (i = args; i < CX2341X_MBOX_MAX_DATA; i++)
241 data[i] = 0;
242
243 /* If this command was issued within the last 30 minutes and with identical
244 data, then just return 0 as there is no need to issue this command again.
245 Just an optimization to prevent unnecessary use of mailboxes. */
246 if (itv->api_cache[cmd].last_jiffies &&
247 jiffies - itv->api_cache[cmd].last_jiffies < msecs_to_jiffies(1800000) &&
248 !memcmp(data, itv->api_cache[cmd].data, sizeof(itv->api_cache[cmd].data))) {
249 itv->api_cache[cmd].last_jiffies = jiffies;
250 return 0;
251 }
252
253 flags = api_info[cmd].flags;
254
255 if (flags & API_DMA) {
256 for (i = 0; i < 100; i++) {
257 mb = i % (mbdata->max_mbox + 1);
258 if (try_mailbox(itv, mbdata, mb)) {
259 write_mailbox(&mbdata->mbox[mb], cmd, args, data);
260 clear_bit(mb, &mbdata->busy);
261 return 0;
262 }
263 IVTV_DEBUG_WARN("%s: mailbox %d not free %08x\n",
264 api_info[cmd].name, mb, readl(&mbdata->mbox[mb].flags));
265 }
266 IVTV_WARN("Could not find free DMA mailbox for %s\n", api_info[cmd].name);
267 clear_all_mailboxes(itv, mbdata);
268 return -EBUSY;
269 }
270
271 if ((flags & API_FAST_RESULT) == API_FAST_RESULT)
272 api_timeout = msecs_to_jiffies(100);
273
274 mb = get_mailbox(itv, mbdata, flags);
275 if (mb < 0) {
276 IVTV_DEBUG_WARN("No free mailbox found (%s)\n", api_info[cmd].name);
277 clear_all_mailboxes(itv, mbdata);
278 return -EBUSY;
279 }
280 mbox = &mbdata->mbox[mb];
281 write_mailbox(mbox, cmd, args, data);
282 if (flags & API_CACHE) {
283 memcpy(itv->api_cache[cmd].data, data, sizeof(itv->api_cache[cmd].data));
284 itv->api_cache[cmd].last_jiffies = jiffies;
285 }
286 if ((flags & API_RESULT) == 0) {
287 clear_bit(mb, &mbdata->busy);
288 return 0;
289 }
290
291 /* Get results */
292 then = jiffies;
293
294 if (!(flags & API_NO_POLL)) {
295 /* First try to poll, then switch to delays */
296 for (i = 0; i < 100; i++) {
297 if (readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)
298 break;
299 }
300 }
301 while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) {
302 if (jiffies - then > api_timeout) {
303 IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name);
304 /* reset the mailbox, but it is likely too late already */
305 write_sync(0, &mbox->flags);
306 clear_bit(mb, &mbdata->busy);
307 return -EIO;
308 }
309 if (flags & API_NO_WAIT_RES)
310 mdelay(1);
311 else
312 ivtv_msleep_timeout(1, 0);
313 }
314 if (jiffies - then > msecs_to_jiffies(100))
315 IVTV_DEBUG_WARN("%s took %u jiffies\n",
316 api_info[cmd].name,
317 jiffies_to_msecs(jiffies - then));
318
319 for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
320 data[i] = readl(&mbox->data[i]);
321 write_sync(0, &mbox->flags);
322 clear_bit(mb, &mbdata->busy);
323 return 0;
324 }
325
326 int ivtv_api(struct ivtv *itv, int cmd, int args, u32 data[])
327 {
328 int res = ivtv_api_call(itv, cmd, args, data);
329
330 /* Allow a single retry, probably already too late though.
331 If there is no free mailbox then that is usually an indication
332 of a more serious problem. */
333 return (res == -EBUSY) ? ivtv_api_call(itv, cmd, args, data) : res;
334 }
335
336 int ivtv_api_func(void *priv, int cmd, int in, int out, u32 data[CX2341X_MBOX_MAX_DATA])
337 {
338 return ivtv_api(priv, cmd, in, data);
339 }
340
341 int ivtv_vapi_result(struct ivtv *itv, u32 data[CX2341X_MBOX_MAX_DATA], int cmd, int args, ...)
342 {
343 va_list ap;
344 int i;
345
346 va_start(ap, args);
347 for (i = 0; i < args; i++) {
348 data[i] = va_arg(ap, u32);
349 }
350 va_end(ap);
351 return ivtv_api(itv, cmd, args, data);
352 }
353
354 int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...)
355 {
356 u32 data[CX2341X_MBOX_MAX_DATA];
357 va_list ap;
358 int i;
359
360 va_start(ap, args);
361 for (i = 0; i < args; i++) {
362 data[i] = va_arg(ap, u32);
363 }
364 va_end(ap);
365 return ivtv_api(itv, cmd, args, data);
366 }
367
368 /* This one is for stuff that can't sleep.. irq handlers, etc.. */
369 void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, u32 data[])
370 {
371 int i;
372
373 for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
374 data[i] = readl(&mbdata->mbox[mb].data[i]);
375 }
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