drivers/media/pci/ivtv/ivtv-mailbox.c

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This source file includes following definitions.
try_mailbox
get_mailbox
write_mailbox
clear_all_mailboxes
ivtv_api_call
ivtv_api
ivtv_api_func
ivtv_vapi_result
ivtv_vapi
ivtv_api_get_data
ivtv_mailbox_cache_invalidate
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3     mailbox functions
   4     Copyright (C) 2003-2004  Kevin Thayer <nufan_wfk at yahoo.com>
   5     Copyright (C) 2004  Chris Kennedy <c@groovy.org>
   6     Copyright (C) 2005-2007  Hans Verkuil <hverkuil@xs4all.nl>
   7 
   8  */
   9 
  10 #include "ivtv-driver.h"
  11 #include "ivtv-mailbox.h"
  12 
  13 /* Firmware mailbox flags*/
  14 #define IVTV_MBOX_FIRMWARE_DONE 0x00000004
  15 #define IVTV_MBOX_DRIVER_DONE   0x00000002
  16 #define IVTV_MBOX_DRIVER_BUSY   0x00000001
  17 #define IVTV_MBOX_FREE          0x00000000
  18 
  19 /* Firmware mailbox standard timeout */
  20 #define IVTV_API_STD_TIMEOUT    0x02000000
  21 
  22 #define API_CACHE        (1 << 0)       /* Allow the command to be stored in the cache */
  23 #define API_RESULT       (1 << 1)       /* Allow 1 second for this cmd to end */
  24 #define API_FAST_RESULT  (3 << 1)       /* Allow 0.1 second for this cmd to end */
  25 #define API_DMA          (1 << 3)       /* DMA mailbox, has special handling */
  26 #define API_HIGH_VOL     (1 << 5)       /* High volume command (i.e. called during encoding or decoding) */
  27 #define API_NO_WAIT_MB   (1 << 4)       /* Command may not wait for a free mailbox */
  28 #define API_NO_WAIT_RES  (1 << 5)       /* Command may not wait for the result */
  29 #define API_NO_POLL      (1 << 6)       /* Avoid pointless polling */
  30 
  31 struct ivtv_api_info {
  32         int flags;              /* Flags, see above */
  33         const char *name;       /* The name of the command */
  34 };
  35 
  36 #define API_ENTRY(x, f) [x] = { (f), #x }
  37 
  38 static const struct ivtv_api_info api_info[256] = {
  39         /* MPEG encoder API */
  40         API_ENTRY(CX2341X_ENC_PING_FW,                  API_FAST_RESULT),
  41         API_ENTRY(CX2341X_ENC_START_CAPTURE,            API_RESULT | API_NO_POLL),
  42         API_ENTRY(CX2341X_ENC_STOP_CAPTURE,             API_RESULT),
  43         API_ENTRY(CX2341X_ENC_SET_AUDIO_ID,             API_CACHE),
  44         API_ENTRY(CX2341X_ENC_SET_VIDEO_ID,             API_CACHE),
  45         API_ENTRY(CX2341X_ENC_SET_PCR_ID,               API_CACHE),
  46         API_ENTRY(CX2341X_ENC_SET_FRAME_RATE,           API_CACHE),
  47         API_ENTRY(CX2341X_ENC_SET_FRAME_SIZE,           API_CACHE),
  48         API_ENTRY(CX2341X_ENC_SET_BIT_RATE,             API_CACHE),
  49         API_ENTRY(CX2341X_ENC_SET_GOP_PROPERTIES,       API_CACHE),
  50         API_ENTRY(CX2341X_ENC_SET_ASPECT_RATIO,         API_CACHE),
  51         API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_MODE,      API_CACHE),
  52         API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_PROPS,     API_CACHE),
  53         API_ENTRY(CX2341X_ENC_SET_CORING_LEVELS,        API_CACHE),
  54         API_ENTRY(CX2341X_ENC_SET_SPATIAL_FILTER_TYPE,  API_CACHE),
  55         API_ENTRY(CX2341X_ENC_SET_VBI_LINE,             API_RESULT),
  56         API_ENTRY(CX2341X_ENC_SET_STREAM_TYPE,          API_CACHE),
  57         API_ENTRY(CX2341X_ENC_SET_OUTPUT_PORT,          API_CACHE),
  58         API_ENTRY(CX2341X_ENC_SET_AUDIO_PROPERTIES,     API_CACHE),
  59         API_ENTRY(CX2341X_ENC_HALT_FW,                  API_FAST_RESULT),
  60         API_ENTRY(CX2341X_ENC_GET_VERSION,              API_FAST_RESULT),
  61         API_ENTRY(CX2341X_ENC_SET_GOP_CLOSURE,          API_CACHE),
  62         API_ENTRY(CX2341X_ENC_GET_SEQ_END,              API_RESULT),
  63         API_ENTRY(CX2341X_ENC_SET_PGM_INDEX_INFO,       API_FAST_RESULT),
  64         API_ENTRY(CX2341X_ENC_SET_VBI_CONFIG,           API_RESULT),
  65         API_ENTRY(CX2341X_ENC_SET_DMA_BLOCK_SIZE,       API_CACHE),
  66         API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_10,  API_FAST_RESULT),
  67         API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_9,   API_FAST_RESULT),
  68         API_ENTRY(CX2341X_ENC_SCHED_DMA_TO_HOST,        API_DMA | API_HIGH_VOL),
  69         API_ENTRY(CX2341X_ENC_INITIALIZE_INPUT,         API_RESULT),
  70         API_ENTRY(CX2341X_ENC_SET_FRAME_DROP_RATE,      API_CACHE),
  71         API_ENTRY(CX2341X_ENC_PAUSE_ENCODER,            API_RESULT),
  72         API_ENTRY(CX2341X_ENC_REFRESH_INPUT,            API_NO_WAIT_MB | API_HIGH_VOL),
  73         API_ENTRY(CX2341X_ENC_SET_COPYRIGHT,            API_CACHE),
  74         API_ENTRY(CX2341X_ENC_SET_EVENT_NOTIFICATION,   API_RESULT),
  75         API_ENTRY(CX2341X_ENC_SET_NUM_VSYNC_LINES,      API_CACHE),
  76         API_ENTRY(CX2341X_ENC_SET_PLACEHOLDER,          API_CACHE),
  77         API_ENTRY(CX2341X_ENC_MUTE_VIDEO,               API_RESULT),
  78         API_ENTRY(CX2341X_ENC_MUTE_AUDIO,               API_RESULT),
  79         API_ENTRY(CX2341X_ENC_SET_VERT_CROP_LINE,       API_FAST_RESULT),
  80         API_ENTRY(CX2341X_ENC_MISC,                     API_FAST_RESULT),
  81         /* Obsolete PULLDOWN API command */
  82         API_ENTRY(0xb1,                                 API_CACHE),
  83 
  84         /* MPEG decoder API */
  85         API_ENTRY(CX2341X_DEC_PING_FW,                  API_FAST_RESULT),
  86         API_ENTRY(CX2341X_DEC_START_PLAYBACK,           API_RESULT | API_NO_POLL),
  87         API_ENTRY(CX2341X_DEC_STOP_PLAYBACK,            API_RESULT),
  88         API_ENTRY(CX2341X_DEC_SET_PLAYBACK_SPEED,       API_RESULT),
  89         API_ENTRY(CX2341X_DEC_STEP_VIDEO,               API_RESULT),
  90         API_ENTRY(CX2341X_DEC_SET_DMA_BLOCK_SIZE,       API_CACHE),
  91         API_ENTRY(CX2341X_DEC_GET_XFER_INFO,            API_FAST_RESULT),
  92         API_ENTRY(CX2341X_DEC_GET_DMA_STATUS,           API_FAST_RESULT),
  93         API_ENTRY(CX2341X_DEC_SCHED_DMA_FROM_HOST,      API_DMA | API_HIGH_VOL),
  94         API_ENTRY(CX2341X_DEC_PAUSE_PLAYBACK,           API_RESULT),
  95         API_ENTRY(CX2341X_DEC_HALT_FW,                  API_FAST_RESULT),
  96         API_ENTRY(CX2341X_DEC_SET_STANDARD,             API_CACHE),
  97         API_ENTRY(CX2341X_DEC_GET_VERSION,              API_FAST_RESULT),
  98         API_ENTRY(CX2341X_DEC_SET_STREAM_INPUT,         API_CACHE),
  99         API_ENTRY(CX2341X_DEC_GET_TIMING_INFO,          API_RESULT /*| API_NO_WAIT_RES*/),
 100         API_ENTRY(CX2341X_DEC_SET_AUDIO_MODE,           API_CACHE),
 101         API_ENTRY(CX2341X_DEC_SET_EVENT_NOTIFICATION,   API_RESULT),
 102         API_ENTRY(CX2341X_DEC_SET_DISPLAY_BUFFERS,      API_CACHE),
 103         API_ENTRY(CX2341X_DEC_EXTRACT_VBI,              API_RESULT),
 104         API_ENTRY(CX2341X_DEC_SET_DECODER_SOURCE,       API_FAST_RESULT),
 105         API_ENTRY(CX2341X_DEC_SET_PREBUFFERING,         API_CACHE),
 106 
 107         /* OSD API */
 108         API_ENTRY(CX2341X_OSD_GET_FRAMEBUFFER,          API_FAST_RESULT),
 109         API_ENTRY(CX2341X_OSD_GET_PIXEL_FORMAT,         API_FAST_RESULT),
 110         API_ENTRY(CX2341X_OSD_SET_PIXEL_FORMAT,         API_CACHE),
 111         API_ENTRY(CX2341X_OSD_GET_STATE,                API_FAST_RESULT),
 112         API_ENTRY(CX2341X_OSD_SET_STATE,                API_CACHE),
 113         API_ENTRY(CX2341X_OSD_GET_OSD_COORDS,           API_FAST_RESULT),
 114         API_ENTRY(CX2341X_OSD_SET_OSD_COORDS,           API_CACHE),
 115         API_ENTRY(CX2341X_OSD_GET_SCREEN_COORDS,        API_FAST_RESULT),
 116         API_ENTRY(CX2341X_OSD_SET_SCREEN_COORDS,        API_CACHE),
 117         API_ENTRY(CX2341X_OSD_GET_GLOBAL_ALPHA,         API_FAST_RESULT),
 118         API_ENTRY(CX2341X_OSD_SET_GLOBAL_ALPHA,         API_CACHE),
 119         API_ENTRY(CX2341X_OSD_SET_BLEND_COORDS,         API_CACHE),
 120         API_ENTRY(CX2341X_OSD_GET_FLICKER_STATE,        API_FAST_RESULT),
 121         API_ENTRY(CX2341X_OSD_SET_FLICKER_STATE,        API_CACHE),
 122         API_ENTRY(CX2341X_OSD_BLT_COPY,                 API_RESULT),
 123         API_ENTRY(CX2341X_OSD_BLT_FILL,                 API_RESULT),
 124         API_ENTRY(CX2341X_OSD_BLT_TEXT,                 API_RESULT),
 125         API_ENTRY(CX2341X_OSD_SET_FRAMEBUFFER_WINDOW,   API_CACHE),
 126         API_ENTRY(CX2341X_OSD_SET_CHROMA_KEY,           API_CACHE),
 127         API_ENTRY(CX2341X_OSD_GET_ALPHA_CONTENT_INDEX,  API_FAST_RESULT),
 128         API_ENTRY(CX2341X_OSD_SET_ALPHA_CONTENT_INDEX,  API_CACHE)
 129 };
 130 
 131 static int try_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int mb)
 132 {
 133         u32 flags = readl(&mbdata->mbox[mb].flags);
 134         int is_free = flags == IVTV_MBOX_FREE || (flags & IVTV_MBOX_FIRMWARE_DONE);
 135 
 136         /* if the mailbox is free, then try to claim it */
 137         if (is_free && !test_and_set_bit(mb, &mbdata->busy)) {
 138                 write_sync(IVTV_MBOX_DRIVER_BUSY, &mbdata->mbox[mb].flags);
 139                 return 1;
 140         }
 141         return 0;
 142 }
 143 
 144 /* Try to find a free mailbox. Note mailbox 0 is reserved for DMA and so is not
 145    attempted here. */
 146 static int get_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int flags)
 147 {
 148         unsigned long then = jiffies;
 149         int i, mb;
 150         int max_mbox = mbdata->max_mbox;
 151         int retries = 100;
 152 
 153         /* All slow commands use the same mailbox, serializing them and also
 154            leaving the other mailbox free for simple fast commands. */
 155         if ((flags & API_FAST_RESULT) == API_RESULT)
 156                 max_mbox = 1;
 157 
 158         /* find free non-DMA mailbox */
 159         for (i = 0; i < retries; i++) {
 160                 for (mb = 1; mb <= max_mbox; mb++)
 161                         if (try_mailbox(itv, mbdata, mb))
 162                                 return mb;
 163 
 164                 /* Sleep before a retry, if not atomic */
 165                 if (!(flags & API_NO_WAIT_MB)) {
 166                         if (time_after(jiffies,
 167                                        then + msecs_to_jiffies(10*retries)))
 168                                break;
 169                         ivtv_msleep_timeout(10, 0);
 170                 }
 171         }
 172         return -ENODEV;
 173 }
 174 
 175 static void write_mailbox(volatile struct ivtv_mailbox __iomem *mbox, int cmd, int args, u32 data[])
 176 {
 177         int i;
 178 
 179         write_sync(cmd, &mbox->cmd);
 180         write_sync(IVTV_API_STD_TIMEOUT, &mbox->timeout);
 181 
 182         for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
 183                 write_sync(data[i], &mbox->data[i]);
 184 
 185         write_sync(IVTV_MBOX_DRIVER_DONE | IVTV_MBOX_DRIVER_BUSY, &mbox->flags);
 186 }
 187 
 188 static void clear_all_mailboxes(struct ivtv *itv, struct ivtv_mailbox_data *mbdata)
 189 {
 190         int i;
 191 
 192         for (i = 0; i <= mbdata->max_mbox; i++) {
 193                 IVTV_DEBUG_WARN("Clearing mailbox %d: cmd 0x%08x flags 0x%08x\n",
 194                         i, readl(&mbdata->mbox[i].cmd), readl(&mbdata->mbox[i].flags));
 195                 write_sync(0, &mbdata->mbox[i].flags);
 196                 clear_bit(i, &mbdata->busy);
 197         }
 198 }
 199 
 200 static int ivtv_api_call(struct ivtv *itv, int cmd, int args, u32 data[])
 201 {
 202         struct ivtv_mailbox_data *mbdata = (cmd >= 128) ? &itv->enc_mbox : &itv->dec_mbox;
 203         volatile struct ivtv_mailbox __iomem *mbox;
 204         int api_timeout = msecs_to_jiffies(1000);
 205         int flags, mb, i;
 206         unsigned long then;
 207 
 208         /* sanity checks */
 209         if (NULL == mbdata) {
 210                 IVTV_ERR("No mailbox allocated\n");
 211                 return -ENODEV;
 212         }
 213         if (args < 0 || args > CX2341X_MBOX_MAX_DATA ||
 214             cmd < 0 || cmd > 255 || api_info[cmd].name == NULL) {
 215                 IVTV_ERR("Invalid MB call: cmd = 0x%02x, args = %d\n", cmd, args);
 216                 return -EINVAL;
 217         }
 218 
 219         if (api_info[cmd].flags & API_HIGH_VOL) {
 220             IVTV_DEBUG_HI_MB("MB Call: %s\n", api_info[cmd].name);
 221         }
 222         else {
 223             IVTV_DEBUG_MB("MB Call: %s\n", api_info[cmd].name);
 224         }
 225 
 226         /* clear possibly uninitialized part of data array */
 227         for (i = args; i < CX2341X_MBOX_MAX_DATA; i++)
 228                 data[i] = 0;
 229 
 230         /* If this command was issued within the last 30 minutes and with identical
 231            data, then just return 0 as there is no need to issue this command again.
 232            Just an optimization to prevent unnecessary use of mailboxes. */
 233         if (itv->api_cache[cmd].last_jiffies &&
 234             time_before(jiffies,
 235                         itv->api_cache[cmd].last_jiffies +
 236                         msecs_to_jiffies(1800000)) &&
 237             !memcmp(data, itv->api_cache[cmd].data, sizeof(itv->api_cache[cmd].data))) {
 238                 itv->api_cache[cmd].last_jiffies = jiffies;
 239                 return 0;
 240         }
 241 
 242         flags = api_info[cmd].flags;
 243 
 244         if (flags & API_DMA) {
 245                 for (i = 0; i < 100; i++) {
 246                         mb = i % (mbdata->max_mbox + 1);
 247                         if (try_mailbox(itv, mbdata, mb)) {
 248                                 write_mailbox(&mbdata->mbox[mb], cmd, args, data);
 249                                 clear_bit(mb, &mbdata->busy);
 250                                 return 0;
 251                         }
 252                         IVTV_DEBUG_WARN("%s: mailbox %d not free %08x\n",
 253                                         api_info[cmd].name, mb, readl(&mbdata->mbox[mb].flags));
 254                 }
 255                 IVTV_WARN("Could not find free DMA mailbox for %s\n", api_info[cmd].name);
 256                 clear_all_mailboxes(itv, mbdata);
 257                 return -EBUSY;
 258         }
 259 
 260         if ((flags & API_FAST_RESULT) == API_FAST_RESULT)
 261                 api_timeout = msecs_to_jiffies(100);
 262 
 263         mb = get_mailbox(itv, mbdata, flags);
 264         if (mb < 0) {
 265                 IVTV_DEBUG_WARN("No free mailbox found (%s)\n", api_info[cmd].name);
 266                 clear_all_mailboxes(itv, mbdata);
 267                 return -EBUSY;
 268         }
 269         mbox = &mbdata->mbox[mb];
 270         write_mailbox(mbox, cmd, args, data);
 271         if (flags & API_CACHE) {
 272                 memcpy(itv->api_cache[cmd].data, data, sizeof(itv->api_cache[cmd].data));
 273                 itv->api_cache[cmd].last_jiffies = jiffies;
 274         }
 275         if ((flags & API_RESULT) == 0) {
 276                 clear_bit(mb, &mbdata->busy);
 277                 return 0;
 278         }
 279 
 280         /* Get results */
 281         then = jiffies;
 282 
 283         if (!(flags & API_NO_POLL)) {
 284                 /* First try to poll, then switch to delays */
 285                 for (i = 0; i < 100; i++) {
 286                         if (readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)
 287                                 break;
 288                 }
 289         }
 290         while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) {
 291                 if (time_after(jiffies, then + api_timeout)) {
 292                         IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name);
 293                         /* reset the mailbox, but it is likely too late already */
 294                         write_sync(0, &mbox->flags);
 295                         clear_bit(mb, &mbdata->busy);
 296                         return -EIO;
 297                 }
 298                 if (flags & API_NO_WAIT_RES)
 299                         mdelay(1);
 300                 else
 301                         ivtv_msleep_timeout(1, 0);
 302         }
 303         if (time_after(jiffies, then + msecs_to_jiffies(100)))
 304                 IVTV_DEBUG_WARN("%s took %u jiffies\n",
 305                                 api_info[cmd].name,
 306                                 jiffies_to_msecs(jiffies - then));
 307 
 308         for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
 309                 data[i] = readl(&mbox->data[i]);
 310         write_sync(0, &mbox->flags);
 311         clear_bit(mb, &mbdata->busy);
 312         return 0;
 313 }
 314 
 315 int ivtv_api(struct ivtv *itv, int cmd, int args, u32 data[])
 316 {
 317         int res = ivtv_api_call(itv, cmd, args, data);
 318 
 319         /* Allow a single retry, probably already too late though.
 320            If there is no free mailbox then that is usually an indication
 321            of a more serious problem. */
 322         return (res == -EBUSY) ? ivtv_api_call(itv, cmd, args, data) : res;
 323 }
 324 
 325 int ivtv_api_func(void *priv, u32 cmd, int in, int out, u32 data[CX2341X_MBOX_MAX_DATA])
 326 {
 327         return ivtv_api(priv, cmd, in, data);
 328 }
 329 
 330 int ivtv_vapi_result(struct ivtv *itv, u32 data[CX2341X_MBOX_MAX_DATA], int cmd, int args, ...)
 331 {
 332         va_list ap;
 333         int i;
 334 
 335         va_start(ap, args);
 336         for (i = 0; i < args; i++) {
 337                 data[i] = va_arg(ap, u32);
 338         }
 339         va_end(ap);
 340         return ivtv_api(itv, cmd, args, data);
 341 }
 342 
 343 int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...)
 344 {
 345         u32 data[CX2341X_MBOX_MAX_DATA];
 346         va_list ap;
 347         int i;
 348 
 349         va_start(ap, args);
 350         for (i = 0; i < args; i++) {
 351                 data[i] = va_arg(ap, u32);
 352         }
 353         va_end(ap);
 354         return ivtv_api(itv, cmd, args, data);
 355 }
 356 
 357 /* This one is for stuff that can't sleep.. irq handlers, etc.. */
 358 void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb,
 359                        int argc, u32 data[])
 360 {
 361         volatile u32 __iomem *p = mbdata->mbox[mb].data;
 362         int i;
 363         for (i = 0; i < argc; i++, p++)
 364                 data[i] = readl(p);
 365 }
 366 
 367 /* Wipe api cache */
 368 void ivtv_mailbox_cache_invalidate(struct ivtv *itv)
 369 {
 370         int i;
 371         for (i = 0; i < 256; i++)
 372                 itv->api_cache[i].last_jiffies = 0;
 373 }
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/pci/ivtv/ivtv-mailbox.c

DEFINITIONS
