staging/atomisp: Add support for the Intel IPU v2

This patch adds support for the Intel IPU v2 as found on Android and IoT
Baytrail-T and Baytrail-CR platforms (those with the IPU PCI mapped). You
will also need the firmware files from your device (Android usually puts
them into /etc) - or you can find them in the downloadable restore/upgrade
kits if you blew them away for some reason.

It may be possible to extend the driver to handle the BYT/T windows
platforms such as the ASUS T100TA. These platforms don't expose the IPU via
the PCI interface but via ACPI buried in the GPU description and with the
camera information somewhere unknown so would need a platform driver
interface adding to the codebase *IFF* the firmware works on such devices.

To get good results you also need a suitable support library such as
libxcam. The camera is intended to be driven from Android so it has a lot of
features that many desktop apps don't fully spport.

In theory all the pieces are there to build it with -DISP2401 and some
differing files to get CherryTrail/T support, but unifying the drivers
properlly is a work in progress.

The IPU driver represents the work of a lot of people within Intel over many
years. It's historical goal was portability rather than Linux upstream. Any
queries about the upstream aimed driver should be sent to me not to the
original authors.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_input_port.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_input_port.h
new file mode 100644
index 000000000000..8a17c3346caa
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_input_port.h
@@ -0,0 +1,66 @@
+/*
+ * Support for Intel Camera Imaging ISP subsystem.
+ * Copyright (c) 2015, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ */
+
+#ifndef __IA_CSS_INPUT_PORT_H
+#define __IA_CSS_INPUT_PORT_H
+
+/** @file
+ * This file contains information about the possible input ports for CSS
+ */
+
+/** Enumeration of the physical input ports on the CSS hardware.
+ *  There are 3 MIPI CSI-2 ports.
+ */
+enum ia_css_csi2_port {
+	IA_CSS_CSI2_PORT0, /* Implicitly map to MIPI_PORT0_ID */
+	IA_CSS_CSI2_PORT1, /* Implicitly map to MIPI_PORT1_ID */
+	IA_CSS_CSI2_PORT2  /* Implicitly map to MIPI_PORT2_ID */
+};
+
+/** Backward compatible for CSS API 2.0 only
+ *  TO BE REMOVED when all drivers move to CSS	API 2.1
+ */
+#define	IA_CSS_CSI2_PORT_4LANE IA_CSS_CSI2_PORT0
+#define	IA_CSS_CSI2_PORT_1LANE IA_CSS_CSI2_PORT1
+#define	IA_CSS_CSI2_PORT_2LANE IA_CSS_CSI2_PORT2
+
+/** The CSI2 interface supports 2 types of compression or can
+ *  be run without compression.
+ */
+enum ia_css_csi2_compression_type {
+	IA_CSS_CSI2_COMPRESSION_TYPE_NONE, /**< No compression */
+	IA_CSS_CSI2_COMPRESSION_TYPE_1,    /**< Compression scheme 1 */
+	IA_CSS_CSI2_COMPRESSION_TYPE_2     /**< Compression scheme 2 */
+};
+
+struct ia_css_csi2_compression {
+	enum ia_css_csi2_compression_type type;
+	/**< Compression used */
+	unsigned int                      compressed_bits_per_pixel;
+	/**< Compressed bits per pixel (only when compression is enabled) */
+	unsigned int                      uncompressed_bits_per_pixel;
+	/**< Uncompressed bits per pixel (only when compression is enabled) */
+};
+
+/** Input port structure.
+ */
+struct ia_css_input_port {
+	enum ia_css_csi2_port port; /**< Physical CSI-2 port */
+	unsigned int num_lanes; /**< Number of lanes used (4-lane port only) */
+	unsigned int timeout;   /**< Timeout value */
+	unsigned int rxcount;   /**< Register value, should include all lanes */
+	struct ia_css_csi2_compression compression; /**< Compression used */
+};
+
+#endif /* __IA_CSS_INPUT_PORT_H */