[media] media: Support Intersil/Techwell TW686x-based video capture cards

This commit introduces the support for the Techwell TW686x video
capture IC. This hardware supports a few DMA modes, including
scatter-gather and frame (contiguous).

This commit makes little use of the DMA engine and instead has
a memcpy based implementation. DMA frame and scatter-gather modes
support may be added in the future.

Currently supported chips:
- TW6864 (4 video channels),
- TW6865 (4 video channels, not tested, second generation chip),
- TW6868 (8 video channels but only 4 first channels using
           built-in video decoder are supported, not tested),
- TW6869 (8 video channels, second generation chip).

[mchehab@osg.samsung.com: make checkpatch happy by using "unsigned int"
  instead  of just "unsigned"]
Cc: Krzysztof Halasa <khalasa@piap.pl>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Tested-by: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/drivers/media/pci/tw686x/tw686x-regs.h b/drivers/media/pci/tw686x/tw686x-regs.h
new file mode 100644
index 000000000000..fcef586a4c8c
--- /dev/null
+++ b/drivers/media/pci/tw686x/tw686x-regs.h
@@ -0,0 +1,122 @@
+/* DMA controller registers */
+#define REG8_1(a0) ((const u16[8]) { a0, a0 + 1, a0 + 2, a0 + 3, \
+				     a0 + 4, a0 + 5, a0 + 6, a0 + 7})
+#define REG8_2(a0) ((const u16[8]) { a0, a0 + 2, a0 + 4, a0 + 6,	\
+				     a0 + 8, a0 + 0xa, a0 + 0xc, a0 + 0xe})
+#define REG8_8(a0) ((const u16[8]) { a0, a0 + 8, a0 + 0x10, a0 + 0x18, \
+				     a0 + 0x20, a0 + 0x28, a0 + 0x30, \
+				     a0 + 0x38})
+#define INT_STATUS		0x00
+#define PB_STATUS		0x01
+#define DMA_CMD			0x02
+#define VIDEO_FIFO_STATUS	0x03
+#define VIDEO_CHANNEL_ID	0x04
+#define VIDEO_PARSER_STATUS	0x05
+#define SYS_SOFT_RST		0x06
+#define DMA_PAGE_TABLE0_ADDR	((const u16[8]) { 0x08, 0xd0, 0xd2, 0xd4, \
+						  0xd6, 0xd8, 0xda, 0xdc })
+#define DMA_PAGE_TABLE1_ADDR	((const u16[8]) { 0x09, 0xd1, 0xd3, 0xd5, \
+						  0xd7, 0xd9, 0xdb, 0xdd })
+#define DMA_CHANNEL_ENABLE	0x0a
+#define DMA_CONFIG		0x0b
+#define DMA_TIMER_INTERVAL	0x0c
+#define DMA_CHANNEL_TIMEOUT	0x0d
+#define VDMA_CHANNEL_CONFIG	REG8_1(0x10)
+#define ADMA_P_ADDR		REG8_2(0x18)
+#define ADMA_B_ADDR		REG8_2(0x19)
+#define DMA10_P_ADDR		0x28
+#define DMA10_B_ADDR		0x29
+#define VIDEO_CONTROL1		0x2a
+#define VIDEO_CONTROL2		0x2b
+#define AUDIO_CONTROL1		0x2c
+#define AUDIO_CONTROL2		0x2d
+#define PHASE_REF		0x2e
+#define GPIO_REG		0x2f
+#define INTL_HBAR_CTRL		REG8_1(0x30)
+#define AUDIO_CONTROL3		0x38
+#define VIDEO_FIELD_CTRL	REG8_1(0x39)
+#define HSCALER_CTRL		REG8_1(0x42)
+#define VIDEO_SIZE		REG8_1(0x4A)
+#define VIDEO_SIZE_F2		REG8_1(0x52)
+#define MD_CONF			REG8_1(0x60)
+#define MD_INIT			REG8_1(0x68)
+#define MD_MAP0			REG8_1(0x70)
+#define VDMA_P_ADDR		REG8_8(0x80) /* not used in DMA SG mode */
+#define VDMA_WHP		REG8_8(0x81)
+#define VDMA_B_ADDR		REG8_8(0x82)
+#define VDMA_F2_P_ADDR		REG8_8(0x84)
+#define VDMA_F2_WHP		REG8_8(0x85)
+#define VDMA_F2_B_ADDR		REG8_8(0x86)
+#define EP_REG_ADDR		0xfe
+#define EP_REG_DATA		0xff
+
+/* Video decoder registers */
+#define VDREG8(a0) ((const u16[8]) { \
+	a0 + 0x000, a0 + 0x010, a0 + 0x020, a0 + 0x030,	\
+	a0 + 0x100, a0 + 0x110, a0 + 0x120, a0 + 0x130})
+#define VIDSTAT			VDREG8(0x100)
+#define BRIGHT			VDREG8(0x101)
+#define CONTRAST		VDREG8(0x102)
+#define SHARPNESS		VDREG8(0x103)
+#define SAT_U			VDREG8(0x104)
+#define SAT_V			VDREG8(0x105)
+#define HUE			VDREG8(0x106)
+#define CROP_HI			VDREG8(0x107)
+#define VDELAY_LO		VDREG8(0x108)
+#define VACTIVE_LO		VDREG8(0x109)
+#define HDELAY_LO		VDREG8(0x10a)
+#define HACTIVE_LO		VDREG8(0x10b)
+#define MVSN			VDREG8(0x10c)
+#define STATUS2			VDREG8(0x10d)
+#define SDT			VDREG8(0x10e)
+#define SDT_EN			VDREG8(0x10f)
+
+#define VSCALE_LO		VDREG8(0x144)
+#define SCALE_HI		VDREG8(0x145)
+#define HSCALE_LO		VDREG8(0x146)
+#define F2CROP_HI		VDREG8(0x147)
+#define F2VDELAY_LO		VDREG8(0x148)
+#define F2VACTIVE_LO		VDREG8(0x149)
+#define F2HDELAY_LO		VDREG8(0x14a)
+#define F2HACTIVE_LO		VDREG8(0x14b)
+#define F2VSCALE_LO		VDREG8(0x14c)
+#define F2SCALE_HI		VDREG8(0x14d)
+#define F2HSCALE_LO		VDREG8(0x14e)
+#define F2CNT			VDREG8(0x14f)
+
+#define VDREG2(a0) ((const u16[2]) { a0, a0 + 0x100 })
+#define SRST			VDREG2(0x180)
+#define ACNTL			VDREG2(0x181)
+#define ACNTL2			VDREG2(0x182)
+#define CNTRL1			VDREG2(0x183)
+#define CKHY			VDREG2(0x184)
+#define SHCOR			VDREG2(0x185)
+#define CORING			VDREG2(0x186)
+#define CLMPG			VDREG2(0x187)
+#define IAGC			VDREG2(0x188)
+#define VCTRL1			VDREG2(0x18f)
+#define MISC1			VDREG2(0x194)
+#define LOOP			VDREG2(0x195)
+#define MISC2			VDREG2(0x196)
+
+#define CLMD			VDREG2(0x197)
+#define ANPWRDOWN		VDREG2(0x1ce)
+#define AIGAIN			((const u16[8]) { 0x1d0, 0x1d1, 0x1d2, 0x1d3, \
+						  0x2d0, 0x2d1, 0x2d2, 0x2d3 })
+
+#define SYS_MODE_DMA_SHIFT	13
+
+#define DMA_CMD_ENABLE		BIT(31)
+#define INT_STATUS_DMA_TOUT	BIT(17)
+#define TW686X_VIDSTAT_HLOCK	BIT(6)
+#define TW686X_VIDSTAT_VDLOSS	BIT(7)
+
+#define TW686X_STD_NTSC_M	0
+#define TW686X_STD_PAL		1
+#define TW686X_STD_SECAM	2
+#define TW686X_STD_NTSC_443	3
+#define TW686X_STD_PAL_M	4
+#define TW686X_STD_PAL_CN	5
+#define TW686X_STD_PAL_60	6
+
+#define TW686X_FIFO_ERROR(x)	(x & ~(0xff))