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linux_dsm_epyc7002/drivers/media/pci/ivtv/ivtv-mailbox.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
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>
*/
#include "ivtv-driver.h"
#include "ivtv-mailbox.h"
#include <stdarg.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,
int argc, u32 data[])
{
volatile u32 __iomem *p = mbdata->mbox[mb].data;
int i;
for (i = 0; i < argc; i++, p++)
data[i] = readl(p);
}
/* Wipe api cache */
void ivtv_mailbox_cache_invalidate(struct ivtv *itv)
{
int i;
for (i = 0; i < 256; i++)
itv->api_cache[i].last_jiffies = 0;
}
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