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>

5 files changed, 229 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.c b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.c
new file mode 100644
index 0000000..942ebe0
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.c
@@ -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.
+ */
+
+#include "ia_css_types.h"
+#include "sh_css_defs.h"
+#ifndef IA_CSS_NO_DEBUG
+#include "ia_css_debug.h"
+#endif
+
+#include "ia_css_aa2.host.h"
+
+/* YUV Anti-Aliasing configuration. */
+const struct ia_css_aa_config default_aa_config = {
+	8191 /* default should be 0 */
+};
+
+/* Bayer Anti-Aliasing configuration. */
+const struct ia_css_aa_config default_baa_config = {
+	8191 /* default should be 0 */
+};
+
+void
+ia_css_aa_encode(
+	struct sh_css_isp_aa_params *to,
+	const struct ia_css_aa_config *from,
+	unsigned size)
+{
+	(void)size;
+	to->strength = from->strength;
+}
+
+void
+ia_css_init_aa_state(
+	void *state,
+	size_t size)
+{
+	memset(state, 0, size);
+}
+
+#ifndef IA_CSS_NO_DEBUG
+void
+ia_css_aa_dump(
+	const struct sh_css_isp_aa_params *aa,
+	unsigned level);
+
+void
+ia_css_aa_debug_dtrace(
+	const struct ia_css_aa_config *config,
+	unsigned level)
+{
+	ia_css_debug_dtrace(level,
+		"config.strength=%d\n",
+		config->strength);
+}
+#endif /* IA_CSS_NO_DEBUG */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.h
new file mode 100644
index 0000000..c3785e0
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2.host.h
@@ -0,0 +1,50 @@
+/*
+ * 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_AA_HOST_H
+#define __IA_CSS_AA_HOST_H
+
+#include "ia_css_aa2_types.h"
+#include "ia_css_aa2_param.h"
+
+/* YUV Anti-Aliasing configuration. */
+extern const struct ia_css_aa_config default_aa_config;
+
+/* Bayer Anti-Aliasing configuration. */
+extern const struct ia_css_aa_config default_baa_config;
+
+void
+ia_css_aa_encode(
+	struct sh_css_isp_aa_params *to,
+	const struct ia_css_aa_config *from,
+	unsigned size);
+
+void
+ia_css_init_aa_state(
+	void *state,
+	size_t size);
+
+#ifndef IA_CSS_NO_DEBUG
+void
+ia_css_aa_dump(
+	const struct sh_css_isp_aa_params *aa,
+	unsigned level);
+
+void
+ia_css_aa_debug_dtrace(
+	const struct ia_css_aa_config *config,
+	unsigned level);
+#endif /* IA_CSS_NO_DEBUG */
+
+#endif /* __IA_CSS_AA_HOST_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_param.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_param.h
new file mode 100644
index 0000000..dbab4d6
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_param.h
@@ -0,0 +1,24 @@
+/*
+ * 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_AA_PARAM_H
+#define __IA_CSS_AA_PARAM_H
+
+#include "type_support.h"
+
+struct sh_css_isp_aa_params {
+	int32_t strength;
+};
+
+#endif /* __IA_CSS_AA_PARAM_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_state.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_state.h
new file mode 100644
index 0000000..cc40401
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_state.h
@@ -0,0 +1,41 @@
+/*
+ * 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_AA2_STATE_H
+#define __IA_CSS_AA2_STATE_H
+
+#include "type_support.h"
+#include "vmem.h" /* for VMEM_ARRAY*/
+
+/* Denotes the maximum number of pixels per line that can be processed:
+* MAX_AA_VECTORS_PER_LINE  = maximum_line_width / ISP_NWAY */
+#ifndef MAX_AA_VECTORS_PER_LINE
+#error Please define MAX_AA_VECTORS_PER_LINE.
+#endif
+
+/* This uses 2 history lines for both y, u and v*/
+#define AA_STATE_Y_BUFFER_HEIGHT	2
+#define AA_STATE_UV_BUFFER_HEIGHT	2
+#define AA_STATE_Y_BUFFER_WIDTH		MAX_AA_VECTORS_PER_LINE
+/* The number of u and v elements is half y due to yuv420 downsampling. */
+#define AA_STATE_UV_BUFFER_WIDTH	(AA_STATE_Y_BUFFER_WIDTH/2)
+
+
+struct ia_css_isp_aa_vmem_state {
+	VMEM_ARRAY(y[AA_STATE_Y_BUFFER_HEIGHT], AA_STATE_Y_BUFFER_WIDTH*ISP_NWAY);
+	VMEM_ARRAY(u[AA_STATE_UV_BUFFER_HEIGHT], AA_STATE_UV_BUFFER_WIDTH*ISP_NWAY);
+	VMEM_ARRAY(v[AA_STATE_UV_BUFFER_HEIGHT], AA_STATE_UV_BUFFER_WIDTH*ISP_NWAY);
+};
+
+#endif /* __IA_CSS_AA2_STATE_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_types.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_types.h
new file mode 100644
index 0000000..834eedb
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/aa/aa_2/ia_css_aa2_types.h
@@ -0,0 +1,48 @@
+/*
+ * 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_AA2_TYPES_H
+#define __IA_CSS_AA2_TYPES_H
+
+/** @file
+* CSS-API header file for Anti-Aliasing parameters.
+*/
+
+
+/** Anti-Aliasing configuration.
+ *
+ *  This structure is used both for YUV AA and Bayer AA.
+ *
+ *  1. YUV Anti-Aliasing
+ *     struct ia_css_aa_config   *aa_config
+ *
+ *     ISP block: AA2
+ *    (ISP1: AA2 is not used.)
+ *     ISP2: AA2 should be used. But, AA2 is not used currently.
+ *
+ *  2. Bayer Anti-Aliasing
+ *     struct ia_css_aa_config   *baa_config
+ *
+ *     ISP block: BAA2
+ *     ISP1: BAA2 is used.
+ *     ISP2: BAA2 is used.
+ */
+struct ia_css_aa_config {
+	uint16_t strength;	/**< Strength of the filter.
+					u0.13, [0,8191],
+					default/ineffective 0 */
+};
+
+#endif /* __IA_CSS_AA2_TYPES_H */
+