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>

7 files changed, 296 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.c b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.c
new file mode 100644
index 0000000..bc14b85
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.c
@@ -0,0 +1,65 @@
+/*
+ * 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_dpc2.host.h"
+#include "assert_support.h"
+
+void
+ia_css_dpc2_encode(
+	struct ia_css_isp_dpc2_params *to,
+	const struct ia_css_dpc2_config *from,
+	size_t size)
+{
+	(void)size;
+
+	assert ((from->metric1 >= 0) && (from->metric1 <= METRIC1_ONE_FP));
+	assert ((from->metric3 >= 0) && (from->metric3 <= METRIC3_ONE_FP));
+	assert ((from->metric2 >= METRIC2_ONE_FP) &&
+			(from->metric2 < 256*METRIC2_ONE_FP));
+	assert ((from->wb_gain_gr > 0) && (from->wb_gain_gr < 16*WBGAIN_ONE_FP));
+	assert ((from->wb_gain_r  > 0) && (from->wb_gain_r  < 16*WBGAIN_ONE_FP));
+	assert ((from->wb_gain_b  > 0) && (from->wb_gain_b  < 16*WBGAIN_ONE_FP));
+	assert ((from->wb_gain_gb > 0) && (from->wb_gain_gb < 16*WBGAIN_ONE_FP));
+
+	to->metric1 = from->metric1;
+	to->metric2 = from->metric2;
+	to->metric3 = from->metric3;
+
+	to->wb_gain_gr = from->wb_gain_gr;
+	to->wb_gain_r  = from->wb_gain_r;
+	to->wb_gain_b  = from->wb_gain_b;
+	to->wb_gain_gb = from->wb_gain_gb;
+}
+
+/* TODO: AM: This needs a proper implementation. */
+void
+ia_css_init_dpc2_state(
+	void *state,
+	size_t size)
+{
+	(void)state;
+	(void)size;
+}
+
+#ifndef IA_CSS_NO_DEBUG
+/* TODO: AM: This needs a proper implementation. */
+void
+ia_css_dpc2_debug_dtrace(
+	const struct ia_css_dpc2_config *config,
+	unsigned level)
+{
+	(void)config;
+	(void)level;
+}
+#endif
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.h
new file mode 100644
index 0000000..641564b
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2.host.h
@@ -0,0 +1,40 @@
+/*
+ * 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_DPC2_HOST_H
+#define __IA_CSS_DPC2_HOST_H
+
+#include "ia_css_dpc2_types.h"
+#include "ia_css_dpc2_param.h"
+#include "ia_css_dpc2_default.host.h"
+
+void
+ia_css_dpc2_encode(
+	struct ia_css_isp_dpc2_params *to,
+	const struct ia_css_dpc2_config *from,
+	size_t size);
+
+void
+ia_css_init_dpc2_state(
+	void *state,
+	size_t size);
+
+#ifndef IA_CSS_NO_DEBUG
+void
+ia_css_dpc2_debug_dtrace(
+	const struct ia_css_dpc2_config *config,
+	unsigned level);
+#endif
+
+#endif /* __IA_CSS_DPC2_HOST_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.c b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.c
new file mode 100644
index 0000000..c102601
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.c
@@ -0,0 +1,26 @@
+/*
+ * 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_dpc2_types.h"
+
+const struct ia_css_dpc2_config default_dpc2_config = {
+	.metric1 = 1638,
+	.metric2 =  128,
+	.metric3 = 1638,
+	.wb_gain_gr = 512,
+	.wb_gain_r  = 512,
+	.wb_gain_b  = 512,
+	.wb_gain_gb = 512
+};
+
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.h
new file mode 100644
index 0000000..a1527ce
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_default.host.h
@@ -0,0 +1,23 @@
+/*
+ * 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_DPC2_DEFAULT_HOST_H
+#define __IA_CSS_DPC2_DEFAULT_HOST_H
+
+#include "ia_css_dpc2_types.h"
+
+extern const struct ia_css_dpc2_config default_dpc2_config;
+
+#endif /* __IA_CSS_DPC2_DEFAULT_HOST_H */
+
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_param.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_param.h
new file mode 100644
index 0000000..ef668d5
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_param.h
@@ -0,0 +1,53 @@
+/*
+ * 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_DPC2_PARAM_H
+#define __IA_CSS_DPC2_PARAM_H
+
+#include "type_support.h"
+#include "vmem.h" /* for VMEM_ARRAY*/
+
+
+/* 4 planes : GR, R, B, GB */
+#define NUM_PLANES		4
+
+/* ToDo: Move this to testsetup */
+#define MAX_FRAME_SIMDWIDTH	30
+
+/* 3 lines state per color plane input_line_state */
+#define DPC2_STATE_INPUT_BUFFER_HEIGHT	(3 * NUM_PLANES)
+/* Each plane has width equal to half frame line */
+#define DPC2_STATE_INPUT_BUFFER_WIDTH	CEIL_DIV(MAX_FRAME_SIMDWIDTH, 2)
+
+/* 1 line state per color plane for local deviation state*/
+#define DPC2_STATE_LOCAL_DEVIATION_BUFFER_HEIGHT	(1 * NUM_PLANES)
+/* Each plane has width equal to half frame line */
+#define DPC2_STATE_LOCAL_DEVIATION_BUFFER_WIDTH		CEIL_DIV(MAX_FRAME_SIMDWIDTH, 2)
+
+/* MINMAX state buffer stores 1 full input line (GR-R color line) */
+#define DPC2_STATE_SECOND_MINMAX_BUFFER_HEIGHT	1
+#define DPC2_STATE_SECOND_MINMAX_BUFFER_WIDTH	MAX_FRAME_SIMDWIDTH
+
+
+struct ia_css_isp_dpc2_params {
+	int32_t metric1;
+	int32_t metric2;
+	int32_t metric3;
+	int32_t wb_gain_gr;
+	int32_t wb_gain_r;
+	int32_t wb_gain_b;
+	int32_t wb_gain_gb;
+};
+
+#endif /* __IA_CSS_DPC2_PARAM_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_state.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_state.h
new file mode 100644
index 0000000..cbf1e81
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_state.h
@@ -0,0 +1,30 @@
+/*
+ * 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_DPC2_STATE_H
+#define __IA_CSS_DPC2_STATE_H
+
+#include "type_support.h"
+#include "vmem.h" /* for VMEM_ARRAY*/
+
+#include "ia_css_dpc2_param.h"
+
+struct sh_css_isp_dpc2_vmem_state {
+	VMEM_ARRAY(dpc2_input_lines[DPC2_STATE_INPUT_BUFFER_HEIGHT], DPC2_STATE_INPUT_BUFFER_WIDTH*ISP_NWAY);
+	VMEM_ARRAY(dpc2_local_deviations[DPC2_STATE_LOCAL_DEVIATION_BUFFER_HEIGHT], DPC2_STATE_LOCAL_DEVIATION_BUFFER_WIDTH*ISP_NWAY);
+	VMEM_ARRAY(dpc2_second_min[DPC2_STATE_SECOND_MINMAX_BUFFER_HEIGHT], DPC2_STATE_SECOND_MINMAX_BUFFER_WIDTH*ISP_NWAY);
+	VMEM_ARRAY(dpc2_second_max[DPC2_STATE_SECOND_MINMAX_BUFFER_HEIGHT], DPC2_STATE_SECOND_MINMAX_BUFFER_WIDTH*ISP_NWAY);
+};
+
+#endif /* __IA_CSS_DPC2_STATE_H */
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_types.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_types.h
new file mode 100644
index 0000000..b2c9741
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/isp/kernels/dpc2/ia_css_dpc2_types.h
@@ -0,0 +1,59 @@
+/*
+ * 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_DPC2_TYPES_H
+#define __IA_CSS_DPC2_TYPES_H
+
+/** @file
+* CSS-API header file for Defect Pixel Correction 2 (DPC2) parameters.
+*/
+
+#include "type_support.h"
+
+/**@{*/
+/** Floating point constants for different metrics. */
+#define METRIC1_ONE_FP	(1<<12)
+#define METRIC2_ONE_FP	(1<<5)
+#define METRIC3_ONE_FP	(1<<12)
+#define WBGAIN_ONE_FP	(1<<9)
+/**@}*/
+
+/**@{*/
+/** Defect Pixel Correction 2 configuration.
+ *
+ * \brief DPC2 public parameters.
+ * \details Struct with all parameters for the Defect Pixel Correction 2
+ * kernel that can be set from the CSS API.
+ *
+ * ISP block: DPC1 (DPC after WB)
+ *            DPC2 (DPC before WB)
+ * ISP1: DPC1 is used.
+ * ISP2: DPC2 is used.
+ *
+ */
+struct ia_css_dpc2_config {
+	/**@{*/
+	int32_t metric1;
+	int32_t metric2;
+	int32_t metric3;
+	int32_t wb_gain_gr;
+	int32_t wb_gain_r;
+	int32_t wb_gain_b;
+	int32_t wb_gain_gb;
+	/**@}*/
+};
+/**@}*/
+
+#endif /* __IA_CSS_DPC2_TYPES_H */
+