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[media] pci: Add tw5864 driver

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Support for boards based on Techwell TW5864 chip which provides
multichannel video & audio grabbing and encoding (H.264, MJPEG,
ADPCM G.726).

This submission implements only H.264 encoding of all channels at D1
resolution.

Thanks to Mark Thompson <sw@jkqxz.net> for help, and for contribution of
H.264 startcode emulation prevention code.

Signed-off-by: Andrey Utkin <andrey.utkin@corp.bluecherry.net>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Andrey Utkin
2016-07-20 10:07:12 -03:00
committed by Mauro Carvalho Chehab
parent 2ba775d0f6
commit 34d1324edd
11 changed files with 4531 additions and 0 deletions
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37
drivers/media/pci/tw5864/tw5864-util.c Normal file
View File

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#include "tw5864.h"
void tw5864_indir_writeb(struct tw5864_dev *dev, u16 addr, u8 data)
{
int retries = 30000;
while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
;
if (!retries)
dev_err(&dev->pci->dev,
"tw_indir_writel() retries exhausted before writing\n");
tw_writel(TW5864_IND_DATA, data);
tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_RW | TW5864_ENABLE);
}
u8 tw5864_indir_readb(struct tw5864_dev *dev, u16 addr)
{
int retries = 30000;
while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
;
if (!retries)
dev_err(&dev->pci->dev,
"tw_indir_readl() retries exhausted before reading\n");
tw_writel(TW5864_IND_CTL, addr << 2 | TW5864_ENABLE);
retries = 30000;
while (tw_readl(TW5864_IND_CTL) & BIT(31) && --retries)
;
if (!retries)
dev_err(&dev->pci->dev,
"tw_indir_readl() retries exhausted at reading\n");
return tw_readl(TW5864_IND_DATA);
}