[media] SoC Camera: add driver for OMAP1 camera interface

This is a V4L2 driver for TI OMAP1 SoC camera interface.

Both videobuf-dma versions are supported, contig and sg, selectable with a
module option. The former uses less processing power, but often fails to
allocate contignuous buffer memory. The latter is free of this problem, but
generates tens of DMA interrupts per frame. If contig memory allocation ever
fails, the driver falls back to sg automatically on next open, but still can
be switched back to contig manually. Both paths work stable for me, even
under heavy load, on my OMAP1510 based Amstrad Delta videophone, that is the
oldest, least powerfull OMAP1 implementation.

The interface generally works in pass-through mode. Since input data byte
endianess can be swapped, it provides up to two v4l2 pixel formats per each of
several soc_mbus formats that have their swapped endian counterparts.

Boards using this driver can provide it with the following platform data:
- if and what freqency clock is expected by an on-board camera sensor,
- what is the maximum pixel clock that should be accepted from the sensor,
- what is the polarity of the sensor provided pixel clock,
- if the interface GPIO line is connected to a sensor reset/powerdown input
  and what is the input polarity.

Created and tested against linux-2.6.36-rc5 on Amstrad Delta.

Signed-off-by: Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/include/media/omap1_camera.h b/include/media/omap1_camera.h
new file mode 100644
index 000000000000..819767cf04d4
--- /dev/null
+++ b/include/media/omap1_camera.h
@@ -0,0 +1,35 @@
+/*
+ * Header for V4L2 SoC Camera driver for OMAP1 Camera Interface
+ *
+ * Copyright (C) 2010, Janusz Krzysztofik <jkrzyszt@tis.icnet.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __MEDIA_OMAP1_CAMERA_H_
+#define __MEDIA_OMAP1_CAMERA_H_
+
+#include <linux/bitops.h>
+
+#define OMAP1_CAMERA_IOSIZE		0x1c
+
+enum omap1_cam_vb_mode {
+	OMAP1_CAM_DMA_CONTIG = 0,
+	OMAP1_CAM_DMA_SG,
+};
+
+#define OMAP1_CAMERA_MIN_BUF_COUNT(x)	((x) == OMAP1_CAM_DMA_CONTIG ? 3 : 2)
+
+struct omap1_cam_platform_data {
+	unsigned long	camexclk_khz;
+	unsigned long	lclk_khz_max;
+	unsigned long	flags;
+};
+
+#define OMAP1_CAMERA_LCLK_RISING	BIT(0)
+#define OMAP1_CAMERA_RST_LOW		BIT(1)
+#define OMAP1_CAMERA_RST_HIGH		BIT(2)
+
+#endif /* __MEDIA_OMAP1_CAMERA_H_ */