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>

4 files changed, 298 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.c b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.c
new file mode 100644
index 0000000..9f94ef1
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.c
@@ -0,0 +1,132 @@
+/*
+ * 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
+/* FIXME: See BZ 4427 */
+#include "ia_css_debug.h"
+#endif
+
+#include "ia_css_csc.host.h"
+
+const struct ia_css_cc_config default_cc_config = {
+	8,
+	{255, 29, 120, 0, -374, -342, 0, -672, 301},
+};
+
+void
+ia_css_encode_cc(
+	struct sh_css_isp_csc_params *to,
+	const struct ia_css_cc_config *from,
+	unsigned size)
+{
+	(void)size;
+#ifndef IA_CSS_NO_DEBUG
+	ia_css_debug_dtrace(IA_CSS_DEBUG_TRACE_PRIVATE, "ia_css_encode_cc() enter:\n");
+#endif
+
+	to->m_shift    = (int16_t) from->fraction_bits;
+	to->m00 = (int16_t) from->matrix[0];
+	to->m01 = (int16_t) from->matrix[1];
+	to->m02 = (int16_t) from->matrix[2];
+	to->m10 = (int16_t) from->matrix[3];
+	to->m11 = (int16_t) from->matrix[4];
+	to->m12 = (int16_t) from->matrix[5];
+	to->m20 = (int16_t) from->matrix[6];
+	to->m21 = (int16_t) from->matrix[7];
+	to->m22 = (int16_t) from->matrix[8];
+
+#ifndef IA_CSS_NO_DEBUG
+	ia_css_debug_dtrace(IA_CSS_DEBUG_TRACE_PRIVATE, "ia_css_encode_cc() leave:\n");
+#endif
+}
+
+void
+ia_css_csc_encode(
+	struct sh_css_isp_csc_params *to,
+	const struct ia_css_cc_config *from,
+	unsigned size)
+{
+	ia_css_encode_cc(to, from, size);
+}
+
+#ifndef IA_CSS_NO_DEBUG
+void
+ia_css_cc_dump(
+	const struct sh_css_isp_csc_params *csc,
+	unsigned level,
+	const char *name)
+{
+	if (!csc) return;
+	ia_css_debug_dtrace(level, "%s\n", name);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m_shift",
+		csc->m_shift);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m00",
+		csc->m00);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m01",
+		csc->m01);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m02",
+		csc->m02);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m10",
+		csc->m10);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m11",
+		csc->m11);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m12",
+		csc->m12);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m20",
+		csc->m20);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m21",
+		csc->m21);
+	ia_css_debug_dtrace(level, "\t%-32s = %d\n",
+		"m22",
+		csc->m22);
+}
+
+void
+ia_css_csc_dump(
+	const struct sh_css_isp_csc_params *csc,
+	unsigned level)
+{
+	ia_css_cc_dump(csc, level, "Color Space Conversion");
+}
+
+void
+ia_css_cc_config_debug_dtrace(
+	const struct ia_css_cc_config *config,
+	unsigned level)
+{
+	ia_css_debug_dtrace(level,
+		"config.m[0]=%d, "
+		"config.m[1]=%d, config.m[2]=%d, "
+		"config.m[3]=%d, config.m[4]=%d, "
+		"config.m[5]=%d, config.m[6]=%d, "
+		"config.m[7]=%d, config.m[8]=%d\n",
+		config->matrix[0],
+		config->matrix[1], config->matrix[2],
+		config->matrix[3], config->matrix[4],
+		config->matrix[5], config->matrix[6],
+		config->matrix[7], config->matrix[8]);
+}
+#endif
+
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.h
new file mode 100644
index 0000000..eb10d8a
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc.host.h
@@ -0,0 +1,54 @@
+/*
+ * 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_CSC_HOST_H
+#define __IA_CSS_CSC_HOST_H
+
+#include "ia_css_csc_types.h"
+#include "ia_css_csc_param.h"
+
+extern const struct ia_css_cc_config default_cc_config;
+
+void
+ia_css_encode_cc(
+	struct sh_css_isp_csc_params *to,
+	const struct ia_css_cc_config *from,
+	unsigned size);
+
+void
+ia_css_csc_encode(
+	struct sh_css_isp_csc_params *to,
+	const struct ia_css_cc_config *from,
+	unsigned size);
+
+#ifndef IA_CSS_NO_DEBUG
+void
+ia_css_cc_dump(
+	const struct sh_css_isp_csc_params *csc, unsigned level,
+	const char *name);
+
+void
+ia_css_csc_dump(
+	const struct sh_css_isp_csc_params *csc,
+	unsigned level);
+
+void
+ia_css_cc_config_debug_dtrace(
+	const struct ia_css_cc_config *config,
+	unsigned level);
+
+#define ia_css_csc_debug_dtrace ia_css_cc_config_debug_dtrace
+#endif
+
+#endif /* __IA_CSS_CSC_HOST_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_param.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_param.h
new file mode 100644
index 0000000..0b054a9
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_param.h
@@ -0,0 +1,34 @@
+/*
+ * 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_CSC_PARAM_H
+#define __IA_CSS_CSC_PARAM_H
+
+#include "type_support.h"
+/* CSC (Color Space Conversion) */
+struct sh_css_isp_csc_params {
+	uint16_t	m_shift;
+	int16_t		m00;
+	int16_t		m01;
+	int16_t		m02;
+	int16_t		m10;
+	int16_t		m11;
+	int16_t		m12;
+	int16_t		m20;
+	int16_t		m21;
+	int16_t		m22;
+};
+
+
+#endif /* __IA_CSS_CSC_PARAM_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_types.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_types.h
new file mode 100644
index 0000000..54ced07
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/csc/csc_1.0/ia_css_csc_types.h
@@ -0,0 +1,78 @@
+/*
+ * 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_CSC_TYPES_H
+#define __IA_CSS_CSC_TYPES_H
+
+/** @file
+* CSS-API header file for Color Space Conversion parameters.
+*/
+
+/** Color Correction configuration.
+ *
+ *  This structure is used for 3 cases.
+ *  ("YCgCo" is the output format of Demosaic.)
+ *
+ *  1. Color Space Conversion (YCgCo to YUV) for ISP1.
+ *     ISP block: CSC1 (Color Space Conversion)
+ *     struct ia_css_cc_config   *cc_config
+ *
+ *  2. Color Correction Matrix (YCgCo to RGB) for ISP2.
+ *     ISP block: CCM2 (Color Correction Matrix)
+ *     struct ia_css_cc_config   *yuv2rgb_cc_config
+ *
+ *  3. Color Space Conversion (RGB to YUV) for ISP2.
+ *     ISP block: CSC2 (Color Space Conversion)
+ *     struct ia_css_cc_config   *rgb2yuv_cc_config
+ *
+ *  default/ineffective:
+ *  1. YCgCo -> YUV
+ *  	1	0.174		0.185
+ *  	0	-0.66252	-0.66874
+ *  	0	-0.83738	0.58131
+ *
+ *	fraction_bits = 12
+ *  	4096	713	758
+ *  	0	-2714	-2739
+ *  	0	-3430	2381
+ *
+ *  2. YCgCo -> RGB
+ *  	1	-1	1
+ *  	1	1	0
+ *  	1	-1	-1
+ *
+ *	fraction_bits = 12
+ *  	4096	-4096	4096
+ *  	4096	4096	0
+ *  	4096	-4096	-4096
+ *
+ *  3. RGB -> YUV
+ *	0.299	   0.587	0.114
+ * 	-0.16874   -0.33126	0.5
+ * 	0.5	   -0.41869	-0.08131
+ *
+ *	fraction_bits = 13
+ *  	2449	4809	934
+ *  	-1382	-2714	4096
+ *  	4096	-3430	-666
+ */
+struct ia_css_cc_config {
+	uint32_t fraction_bits;/**< Fractional bits of matrix.
+					u8.0, [0,13] */
+	int32_t matrix[3 * 3]; /**< Conversion matrix.
+					s[13-fraction_bits].[fraction_bits],
+					[-8192,8191] */
+};
+
+#endif /* __IA_CSS_CSC_TYPES_H */