[media] Add the via framebuffer camera controller driver

Add a driver for the video capture port on VIA integrated chipsets.  This
version has a remaining OLPCism or two and expects to be talking to an
ov7670; those can be improved as the need arises.

This work was supported by the One Laptop Per Child project.
Thanks to Laurent Pinchart for a number of useful comments.

Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 93 insertions, 0 deletions

diff --git a/drivers/media/video/via-camera.h b/drivers/media/video/via-camera.h
new file mode 100644
index 000000000000..b12a4b3d616f
--- /dev/null
+++ b/drivers/media/video/via-camera.h
@@ -0,0 +1,93 @@
+/*
+ * VIA Camera register definitions.
+ */
+#define VCR_INTCTRL     0x300   /* Capture interrupt control */
+#define   VCR_IC_EAV      0x0001   /* End of active video status */
+#define   VCR_IC_EVBI     0x0002   /* End of VBI status */
+#define   VCR_IC_FBOTFLD  0x0004   /* "flipping" Bottom field is active */
+#define   VCR_IC_ACTBUF   0x0018   /* Active video buffer  */
+#define   VCR_IC_VSYNC    0x0020   /* 0 = VB, 1 = active video */
+#define   VCR_IC_BOTFLD   0x0040   /* Bottom field is active */
+#define   VCR_IC_FFULL    0x0080   /* FIFO full */
+#define   VCR_IC_INTEN    0x0100   /* End of active video int. enable */
+#define   VCR_IC_VBIINT   0x0200   /* End of VBI int enable */
+#define   VCR_IC_VBIBUF   0x0400   /* Current VBI buffer */
+
+#define VCR_TSC         0x308   /* Transport stream control */
+#define VCR_TSC_ENABLE    0x000001   /* Transport stream input enable */
+#define VCR_TSC_DROPERR   0x000002   /* Drop error packets */
+#define VCR_TSC_METHOD    0x00000c   /* DMA method (non-functional) */
+#define VCR_TSC_COUNT     0x07fff0   /* KByte or packet count */
+#define VCR_TSC_CBMODE    0x080000   /* Change buffer by byte count */
+#define VCR_TSC_PSSIG     0x100000   /* Packet starting signal disable */
+#define VCR_TSC_BE        0x200000   /* MSB first (serial mode) */
+#define VCR_TSC_SERIAL    0x400000   /* Serial input (0 = parallel) */
+
+#define VCR_CAPINTC     0x310   /* Capture interface control */
+#define   VCR_CI_ENABLE   0x00000001  /* Capture enable */
+#define   VCR_CI_BSS      0x00000002  /* WTF "bit stream selection" */
+#define   VCR_CI_3BUFS    0x00000004  /* 1 = 3 buffers, 0 = 2 buffers */
+#define   VCR_CI_VIPEN    0x00000008  /* VIP enable */
+#define   VCR_CI_CCIR601_8  0           /* CCIR601 input stream, 8 bit */
+#define   VCR_CI_CCIR656_8  0x00000010  /* ... CCIR656, 8 bit */
+#define   VCR_CI_CCIR601_16 0x00000020  /* ... CCIR601, 16 bit */
+#define   VCR_CI_CCIR656_16 0x00000030  /* ... CCIR656, 16 bit */
+#define   VCR_CI_HDMODE   0x00000040  /* CCIR656-16 hdr decode mode; 1=16b */
+#define   VCR_CI_BSWAP    0x00000080  /* Swap bytes (16-bit) */
+#define   VCR_CI_YUYV     0           /* Byte order 0123 */
+#define   VCR_CI_UYVY     0x00000100  /* Byte order 1032 */
+#define   VCR_CI_YVYU     0x00000200  /* Byte order 0321 */
+#define   VCR_CI_VYUY     0x00000300  /* Byte order 3012 */
+#define   VCR_CI_VIPTYPE  0x00000400  /* VIP type */
+#define   VCR_CI_IFSEN    0x00000800  /* Input field signal enable */
+#define   VCR_CI_DIODD    0           /* De-interlace odd, 30fps */
+#define   VCR_CI_DIEVEN   0x00001000  /*    ...even field, 30fps */
+#define   VCR_CI_DIBOTH   0x00002000  /*    ...both fields, 60fps */
+#define   VCR_CI_DIBOTH30 0x00003000  /*    ...both fields, 30fps interlace */
+#define   VCR_CI_CONVTYPE 0x00004000  /* 4:2:2 to 4:4:4; 1 = interpolate */
+#define   VCR_CI_CFC      0x00008000  /* Capture flipping control */
+#define   VCR_CI_FILTER   0x00070000  /* Horiz filter mode select
+                                         000 = none
+                                         001 = 2 tap
+                                         010 = 3 tap
+                                         011 = 4 tap
+                                         100 = 5 tap */
+#define   VCR_CI_CLKINV   0x00080000  /* Input CLK inverted */
+#define   VCR_CI_VREFINV  0x00100000  /* VREF inverted */
+#define   VCR_CI_HREFINV  0x00200000  /* HREF inverted */
+#define   VCR_CI_FLDINV   0x00400000  /* Field inverted */
+#define   VCR_CI_CLKPIN   0x00800000  /* Capture clock pin */
+#define   VCR_CI_THRESH   0x0f000000  /* Capture fifo threshold */
+#define   VCR_CI_HRLE     0x10000000  /* Positive edge of HREF */
+#define   VCR_CI_VRLE     0x20000000  /* Positive edge of VREF */
+#define   VCR_CI_OFLDINV  0x40000000  /* Field output inverted */
+#define   VCR_CI_CLKEN    0x80000000  /* Capture clock enable */
+
+#define VCR_HORRANGE    0x314   /* Active video horizontal range */
+#define VCR_VERTRANGE   0x318   /* Active video vertical range */
+#define VCR_AVSCALE     0x31c   /* Active video scaling control */
+#define   VCR_AVS_HEN     0x00000800   /* Horizontal scale enable */
+#define   VCR_AVS_VEN     0x04000000   /* Vertical enable */
+#define VCR_VBIHOR      0x320   /* VBI Data horizontal range */
+#define VCR_VBIVERT     0x324   /* VBI data vertical range */
+#define VCR_VBIBUF1     0x328   /* First VBI buffer */
+#define VCR_VBISTRIDE   0x32c   /* VBI stride */
+#define VCR_ANCDATACNT  0x330   /* Ancillary data count setting */
+#define VCR_MAXDATA     0x334   /* Active data count of active video */
+#define VCR_MAXVBI      0x338   /* Maximum data count of VBI */
+#define VCR_CAPDATA     0x33c   /* Capture data count */
+#define VCR_VBUF1       0x340   /* First video buffer */
+#define VCR_VBUF2       0x344   /* Second video buffer */
+#define VCR_VBUF3       0x348   /* Third video buffer */
+#define VCR_VBUF_MASK   0x1ffffff0      /* Bits 28:4 */
+#define VCR_VBIBUF2     0x34c   /* Second VBI buffer */
+#define VCR_VSTRIDE     0x350   /* Stride of video + coring control */
+#define   VCR_VS_STRIDE_SHIFT 4
+#define   VCR_VS_STRIDE   0x00001ff0  /* Stride (8-byte units) */
+#define   VCR_VS_CCD      0x007f0000  /* Coring compare data */
+#define   VCR_VS_COREEN   0x00800000  /* Coring enable */
+#define VCR_TS0ERR      0x354   /* TS buffer 0 error indicator */
+#define VCR_TS1ERR      0x358   /* TS buffer 0 error indicator */
+#define VCR_TS2ERR      0x35c   /* TS buffer 0 error indicator */
+
+/* Add 0x1000 for the second capture engine registers */