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linux/drivers/media/video/ivtv/ivtv-mailbox.c
Julia Lawall 168c626cb8 V4L/DVB (7591): drivers/media/video: use time_before, time_before_eq, etc 
The functions time_before, time_before_eq, time_after, and time_after_eq
are more robust for comparing jiffies against other values.

A simplified version of the semantic patch making this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// <smpl>
@ change_compare_np @
expression E;
@@

(
- jiffies <= E
+ time_before_eq(jiffies,E)
|
- jiffies >= E
+ time_after_eq(jiffies,E)
|
- jiffies < E
+ time_before(jiffies,E)
|
- jiffies > E
+ time_after(jiffies,E)
)

@ include depends on change_compare_np @
@@

@ no_include depends on !include && change_compare_np @
@@

  #include <linux/...>
+ #include <linux/jiffies.h>
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
2008-04-24 14:09:40 -03:00

379 lines
13 KiB
C
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/*
mailbox functions
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2004 Chris Kennedy <c@groovy.org>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <stdarg.h>
#include "ivtv-driver.h"
#include "ivtv-mailbox.h"
/* Firmware mailbox flags*/
#define IVTV_MBOX_FIRMWARE_DONE 0x00000004
#define IVTV_MBOX_DRIVER_DONE 0x00000002
#define IVTV_MBOX_DRIVER_BUSY 0x00000001
#define IVTV_MBOX_FREE 0x00000000
/* Firmware mailbox standard timeout */
#define IVTV_API_STD_TIMEOUT 0x02000000
#define API_CACHE (1 << 0) /* Allow the command to be stored in the cache */
#define API_RESULT (1 << 1) /* Allow 1 second for this cmd to end */
#define API_FAST_RESULT (3 << 1) /* Allow 0.1 second for this cmd to end */
#define API_DMA (1 << 3) /* DMA mailbox, has special handling */
#define API_HIGH_VOL (1 << 5) /* High volume command (i.e. called during encoding or decoding) */
#define API_NO_WAIT_MB (1 << 4) /* Command may not wait for a free mailbox */
#define API_NO_WAIT_RES (1 << 5) /* Command may not wait for the result */
#define API_NO_POLL (1 << 6) /* Avoid pointless polling */
struct ivtv_api_info {
int flags; /* Flags, see above */
const char *name; /* The name of the command */
};
#define API_ENTRY(x, f) [x] = { (f), #x }
static const struct ivtv_api_info api_info[256] = {
/* MPEG encoder API */
API_ENTRY(CX2341X_ENC_PING_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_START_CAPTURE, API_RESULT | API_NO_POLL),
API_ENTRY(CX2341X_ENC_STOP_CAPTURE, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_AUDIO_ID, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_VIDEO_ID, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_PCR_ID, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_FRAME_RATE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_FRAME_SIZE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_BIT_RATE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_GOP_PROPERTIES, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_ASPECT_RATIO, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_MODE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_DNR_FILTER_PROPS, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_CORING_LEVELS, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_SPATIAL_FILTER_TYPE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_VBI_LINE, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_STREAM_TYPE, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_OUTPUT_PORT, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_AUDIO_PROPERTIES, API_CACHE),
API_ENTRY(CX2341X_ENC_HALT_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_GET_VERSION, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_SET_GOP_CLOSURE, API_CACHE),
API_ENTRY(CX2341X_ENC_GET_SEQ_END, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_PGM_INDEX_INFO, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_SET_VBI_CONFIG, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_DMA_BLOCK_SIZE, API_CACHE),
API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_10, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_GET_PREV_DMA_INFO_MB_9, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_SCHED_DMA_TO_HOST, API_DMA | API_HIGH_VOL),
API_ENTRY(CX2341X_ENC_INITIALIZE_INPUT, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_FRAME_DROP_RATE, API_CACHE),
API_ENTRY(CX2341X_ENC_PAUSE_ENCODER, API_RESULT),
API_ENTRY(CX2341X_ENC_REFRESH_INPUT, API_NO_WAIT_MB | API_HIGH_VOL),
API_ENTRY(CX2341X_ENC_SET_COPYRIGHT, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_EVENT_NOTIFICATION, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_NUM_VSYNC_LINES, API_CACHE),
API_ENTRY(CX2341X_ENC_SET_PLACEHOLDER, API_CACHE),
API_ENTRY(CX2341X_ENC_MUTE_VIDEO, API_RESULT),
API_ENTRY(CX2341X_ENC_MUTE_AUDIO, API_RESULT),
API_ENTRY(CX2341X_ENC_SET_VERT_CROP_LINE, API_FAST_RESULT),
API_ENTRY(CX2341X_ENC_MISC, API_FAST_RESULT),
/* Obsolete PULLDOWN API command */
API_ENTRY(0xb1, API_CACHE),
/* MPEG decoder API */
API_ENTRY(CX2341X_DEC_PING_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_START_PLAYBACK, API_RESULT | API_NO_POLL),
API_ENTRY(CX2341X_DEC_STOP_PLAYBACK, API_RESULT),
API_ENTRY(CX2341X_DEC_SET_PLAYBACK_SPEED, API_RESULT),
API_ENTRY(CX2341X_DEC_STEP_VIDEO, API_RESULT),
API_ENTRY(CX2341X_DEC_SET_DMA_BLOCK_SIZE, API_CACHE),
API_ENTRY(CX2341X_DEC_GET_XFER_INFO, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_GET_DMA_STATUS, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_SCHED_DMA_FROM_HOST, API_DMA | API_HIGH_VOL),
API_ENTRY(CX2341X_DEC_PAUSE_PLAYBACK, API_RESULT),
API_ENTRY(CX2341X_DEC_HALT_FW, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_SET_STANDARD, API_CACHE),
API_ENTRY(CX2341X_DEC_GET_VERSION, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_SET_STREAM_INPUT, API_CACHE),
API_ENTRY(CX2341X_DEC_GET_TIMING_INFO, API_RESULT /*| API_NO_WAIT_RES*/),
API_ENTRY(CX2341X_DEC_SET_AUDIO_MODE, API_CACHE),
API_ENTRY(CX2341X_DEC_SET_EVENT_NOTIFICATION, API_RESULT),
API_ENTRY(CX2341X_DEC_SET_DISPLAY_BUFFERS, API_CACHE),
API_ENTRY(CX2341X_DEC_EXTRACT_VBI, API_RESULT),
API_ENTRY(CX2341X_DEC_SET_DECODER_SOURCE, API_FAST_RESULT),
API_ENTRY(CX2341X_DEC_SET_PREBUFFERING, API_CACHE),
/* OSD API */
API_ENTRY(CX2341X_OSD_GET_FRAMEBUFFER, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_GET_PIXEL_FORMAT, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_PIXEL_FORMAT, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_STATE, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_STATE, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_OSD_COORDS, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_OSD_COORDS, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_SCREEN_COORDS, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_SCREEN_COORDS, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_GLOBAL_ALPHA, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_GLOBAL_ALPHA, API_CACHE),
API_ENTRY(CX2341X_OSD_SET_BLEND_COORDS, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_FLICKER_STATE, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_FLICKER_STATE, API_CACHE),
API_ENTRY(CX2341X_OSD_BLT_COPY, API_RESULT),
API_ENTRY(CX2341X_OSD_BLT_FILL, API_RESULT),
API_ENTRY(CX2341X_OSD_BLT_TEXT, API_RESULT),
API_ENTRY(CX2341X_OSD_SET_FRAMEBUFFER_WINDOW, API_CACHE),
API_ENTRY(CX2341X_OSD_SET_CHROMA_KEY, API_CACHE),
API_ENTRY(CX2341X_OSD_GET_ALPHA_CONTENT_INDEX, API_FAST_RESULT),
API_ENTRY(CX2341X_OSD_SET_ALPHA_CONTENT_INDEX, API_CACHE)
};
static int try_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int mb)
{
u32 flags = readl(&mbdata->mbox[mb].flags);
int is_free = flags == IVTV_MBOX_FREE || (flags & IVTV_MBOX_FIRMWARE_DONE);
/* if the mailbox is free, then try to claim it */
if (is_free && !test_and_set_bit(mb, &mbdata->busy)) {
write_sync(IVTV_MBOX_DRIVER_BUSY, &mbdata->mbox[mb].flags);
return 1;
}
return 0;
}
/* Try to find a free mailbox. Note mailbox 0 is reserved for DMA and so is not
attempted here. */
static int get_mailbox(struct ivtv *itv, struct ivtv_mailbox_data *mbdata, int flags)
{
unsigned long then = jiffies;
int i, mb;
int max_mbox = mbdata->max_mbox;
int retries = 100;
/* All slow commands use the same mailbox, serializing them and also
leaving the other mailbox free for simple fast commands. */
if ((flags & API_FAST_RESULT) == API_RESULT)
max_mbox = 1;
/* find free non-DMA mailbox */
for (i = 0; i < retries; i++) {
for (mb = 1; mb <= max_mbox; mb++)
if (try_mailbox(itv, mbdata, mb))
return mb;
/* Sleep before a retry, if not atomic */
if (!(flags & API_NO_WAIT_MB)) {
if (time_after(jiffies,
then + msecs_to_jiffies(10*retries)))
break;
ivtv_msleep_timeout(10, 0);
}
}
return -ENODEV;
}
static void write_mailbox(volatile struct ivtv_mailbox __iomem *mbox, int cmd, int args, u32 data[])
{
int i;
write_sync(cmd, &mbox->cmd);
write_sync(IVTV_API_STD_TIMEOUT, &mbox->timeout);
for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
write_sync(data[i], &mbox->data[i]);
write_sync(IVTV_MBOX_DRIVER_DONE | IVTV_MBOX_DRIVER_BUSY, &mbox->flags);
}
static void clear_all_mailboxes(struct ivtv *itv, struct ivtv_mailbox_data *mbdata)
{
int i;
for (i = 0; i <= mbdata->max_mbox; i++) {
IVTV_DEBUG_WARN("Clearing mailbox %d: cmd 0x%08x flags 0x%08x\n",
i, readl(&mbdata->mbox[i].cmd), readl(&mbdata->mbox[i].flags));
write_sync(0, &mbdata->mbox[i].flags);
clear_bit(i, &mbdata->busy);
}
}
static int ivtv_api_call(struct ivtv *itv, int cmd, int args, u32 data[])
{
struct ivtv_mailbox_data *mbdata = (cmd >= 128) ? &itv->enc_mbox : &itv->dec_mbox;
volatile struct ivtv_mailbox __iomem *mbox;
int api_timeout = msecs_to_jiffies(1000);
int flags, mb, i;
unsigned long then;
/* sanity checks */
if (NULL == mbdata) {
IVTV_ERR("No mailbox allocated\n");
return -ENODEV;
}
if (args < 0 || args > CX2341X_MBOX_MAX_DATA ||
cmd < 0 || cmd > 255 || api_info[cmd].name == NULL) {
IVTV_ERR("Invalid MB call: cmd = 0x%02x, args = %d\n", cmd, args);
return -EINVAL;
}
if (api_info[cmd].flags & API_HIGH_VOL) {
IVTV_DEBUG_HI_MB("MB Call: %s\n", api_info[cmd].name);
}
else {
IVTV_DEBUG_MB("MB Call: %s\n", api_info[cmd].name);
}
/* clear possibly uninitialized part of data array */
for (i = args; i < CX2341X_MBOX_MAX_DATA; i++)
data[i] = 0;
/* If this command was issued within the last 30 minutes and with identical
data, then just return 0 as there is no need to issue this command again.
Just an optimization to prevent unnecessary use of mailboxes. */
if (itv->api_cache[cmd].last_jiffies &&
time_before(jiffies,
itv->api_cache[cmd].last_jiffies +
msecs_to_jiffies(1800000)) &&
!memcmp(data, itv->api_cache[cmd].data, sizeof(itv->api_cache[cmd].data))) {
itv->api_cache[cmd].last_jiffies = jiffies;
return 0;
}
flags = api_info[cmd].flags;
if (flags & API_DMA) {
for (i = 0; i < 100; i++) {
mb = i % (mbdata->max_mbox + 1);
if (try_mailbox(itv, mbdata, mb)) {
write_mailbox(&mbdata->mbox[mb], cmd, args, data);
clear_bit(mb, &mbdata->busy);
return 0;
}
IVTV_DEBUG_WARN("%s: mailbox %d not free %08x\n",
api_info[cmd].name, mb, readl(&mbdata->mbox[mb].flags));
}
IVTV_WARN("Could not find free DMA mailbox for %s\n", api_info[cmd].name);
clear_all_mailboxes(itv, mbdata);
return -EBUSY;
}
if ((flags & API_FAST_RESULT) == API_FAST_RESULT)
api_timeout = msecs_to_jiffies(100);
mb = get_mailbox(itv, mbdata, flags);
if (mb < 0) {
IVTV_DEBUG_WARN("No free mailbox found (%s)\n", api_info[cmd].name);
clear_all_mailboxes(itv, mbdata);
return -EBUSY;
}
mbox = &mbdata->mbox[mb];
write_mailbox(mbox, cmd, args, data);
if (flags & API_CACHE) {
memcpy(itv->api_cache[cmd].data, data, sizeof(itv->api_cache[cmd].data));
itv->api_cache[cmd].last_jiffies = jiffies;
}
if ((flags & API_RESULT) == 0) {
clear_bit(mb, &mbdata->busy);
return 0;
}
/* Get results */
then = jiffies;
if (!(flags & API_NO_POLL)) {
/* First try to poll, then switch to delays */
for (i = 0; i < 100; i++) {
if (readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)
break;
}
}
while (!(readl(&mbox->flags) & IVTV_MBOX_FIRMWARE_DONE)) {
if (time_after(jiffies, then + api_timeout)) {
IVTV_DEBUG_WARN("Could not get result (%s)\n", api_info[cmd].name);
/* reset the mailbox, but it is likely too late already */
write_sync(0, &mbox->flags);
clear_bit(mb, &mbdata->busy);
return -EIO;
}
if (flags & API_NO_WAIT_RES)
mdelay(1);
else
ivtv_msleep_timeout(1, 0);
}
if (time_after(jiffies, then + msecs_to_jiffies(100)))
IVTV_DEBUG_WARN("%s took %u jiffies\n",
api_info[cmd].name,
jiffies_to_msecs(jiffies - then));
for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
data[i] = readl(&mbox->data[i]);
write_sync(0, &mbox->flags);
clear_bit(mb, &mbdata->busy);
return 0;
}
int ivtv_api(struct ivtv *itv, int cmd, int args, u32 data[])
{
int res = ivtv_api_call(itv, cmd, args, data);
/* Allow a single retry, probably already too late though.
If there is no free mailbox then that is usually an indication
of a more serious problem. */
return (res == -EBUSY) ? ivtv_api_call(itv, cmd, args, data) : res;
}
int ivtv_api_func(void *priv, u32 cmd, int in, int out, u32 data[CX2341X_MBOX_MAX_DATA])
{
return ivtv_api(priv, cmd, in, data);
}
int ivtv_vapi_result(struct ivtv *itv, u32 data[CX2341X_MBOX_MAX_DATA], int cmd, int args, ...)
{
va_list ap;
int i;
va_start(ap, args);
for (i = 0; i < args; i++) {
data[i] = va_arg(ap, u32);
}
va_end(ap);
return ivtv_api(itv, cmd, args, data);
}
int ivtv_vapi(struct ivtv *itv, int cmd, int args, ...)
{
u32 data[CX2341X_MBOX_MAX_DATA];
va_list ap;
int i;
va_start(ap, args);
for (i = 0; i < args; i++) {
data[i] = va_arg(ap, u32);
}
va_end(ap);
return ivtv_api(itv, cmd, args, data);
}
/* This one is for stuff that can't sleep.. irq handlers, etc.. */
void ivtv_api_get_data(struct ivtv_mailbox_data *mbdata, int mb, u32 data[])
{
int i;
for (i = 0; i < CX2341X_MBOX_MAX_DATA; i++)
data[i] = readl(&mbdata->mbox[mb].data[i]);
}
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