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, 196 insertions, 0 deletions

diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_event_public.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_event_public.h
new file mode 100644
index 0000000..aaf3497
--- /dev/null
+++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/ia_css_event_public.h
@@ -0,0 +1,196 @@
+/*
+ * 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_EVENT_PUBLIC_H
+#define __IA_CSS_EVENT_PUBLIC_H
+
+/** @file
+ * This file contains CSS-API events functionality
+ */
+
+#include <type_support.h>	/* uint8_t */
+#include <ia_css_err.h>		/* ia_css_err */
+#include <ia_css_types.h>	/* ia_css_pipe */
+#include <ia_css_timer.h>	/* ia_css_timer */
+
+/** The event type, distinguishes the kind of events that
+ * can are generated by the CSS system.
+ *
+ * !!!IMPORTANT!!! KEEP THE FOLLOWING IN SYNC:
+ * 1) "enum ia_css_event_type"					(ia_css_event_public.h)
+ * 2) "enum sh_css_sp_event_type"				(sh_css_internal.h)
+ * 3) "enum ia_css_event_type event_id_2_event_mask"		(event_handler.sp.c)
+ * 4) "enum ia_css_event_type convert_event_sp_to_host_domain"	(sh_css.c)
+ */
+enum ia_css_event_type {
+	IA_CSS_EVENT_TYPE_OUTPUT_FRAME_DONE		= 1 << 0,
+	/**< Output frame ready. */
+	IA_CSS_EVENT_TYPE_SECOND_OUTPUT_FRAME_DONE	= 1 << 1,
+	/**< Second output frame ready. */
+	IA_CSS_EVENT_TYPE_VF_OUTPUT_FRAME_DONE		= 1 << 2,
+	/**< Viewfinder Output frame ready. */
+	IA_CSS_EVENT_TYPE_SECOND_VF_OUTPUT_FRAME_DONE	= 1 << 3,
+	/**< Second viewfinder Output frame ready. */
+	IA_CSS_EVENT_TYPE_3A_STATISTICS_DONE		= 1 << 4,
+	/**< Indication that 3A statistics are available. */
+	IA_CSS_EVENT_TYPE_DIS_STATISTICS_DONE		= 1 << 5,
+	/**< Indication that DIS statistics are available. */
+	IA_CSS_EVENT_TYPE_PIPELINE_DONE			= 1 << 6,
+	/**< Pipeline Done event, sent after last pipeline stage. */
+	IA_CSS_EVENT_TYPE_FRAME_TAGGED			= 1 << 7,
+	/**< Frame tagged. */
+	IA_CSS_EVENT_TYPE_INPUT_FRAME_DONE		= 1 << 8,
+	/**< Input frame ready. */
+	IA_CSS_EVENT_TYPE_METADATA_DONE			= 1 << 9,
+	/**< Metadata ready. */
+	IA_CSS_EVENT_TYPE_LACE_STATISTICS_DONE		= 1 << 10,
+	/**< Indication that LACE statistics are available. */
+	IA_CSS_EVENT_TYPE_ACC_STAGE_COMPLETE		= 1 << 11,
+	/**< Extension stage complete. */
+	IA_CSS_EVENT_TYPE_TIMER				= 1 << 12,
+	/**< Timer event for measuring the SP side latencies. It contains the
+             32-bit timer value from the SP */
+	IA_CSS_EVENT_TYPE_PORT_EOF			= 1 << 13,
+	/**< End Of Frame event, sent when in buffered sensor mode. */
+	IA_CSS_EVENT_TYPE_FW_WARNING			= 1 << 14,
+	/**< Performance warning encounter by FW */
+	IA_CSS_EVENT_TYPE_FW_ASSERT			= 1 << 15,
+	/**< Assertion hit by FW */
+};
+
+#define IA_CSS_EVENT_TYPE_NONE 0
+
+/** IA_CSS_EVENT_TYPE_ALL is a mask for all pipe related events.
+ * The other events (such as PORT_EOF) cannot be enabled/disabled
+ * and are hence excluded from this macro.
+ */
+#define IA_CSS_EVENT_TYPE_ALL \
+	(IA_CSS_EVENT_TYPE_OUTPUT_FRAME_DONE		| \
+	 IA_CSS_EVENT_TYPE_SECOND_OUTPUT_FRAME_DONE	| \
+	 IA_CSS_EVENT_TYPE_VF_OUTPUT_FRAME_DONE		| \
+	 IA_CSS_EVENT_TYPE_SECOND_VF_OUTPUT_FRAME_DONE	| \
+	 IA_CSS_EVENT_TYPE_3A_STATISTICS_DONE		| \
+	 IA_CSS_EVENT_TYPE_DIS_STATISTICS_DONE		| \
+	 IA_CSS_EVENT_TYPE_PIPELINE_DONE		| \
+	 IA_CSS_EVENT_TYPE_FRAME_TAGGED			| \
+	 IA_CSS_EVENT_TYPE_INPUT_FRAME_DONE		| \
+	 IA_CSS_EVENT_TYPE_METADATA_DONE		| \
+	 IA_CSS_EVENT_TYPE_LACE_STATISTICS_DONE		| \
+	 IA_CSS_EVENT_TYPE_ACC_STAGE_COMPLETE)
+
+/** The event struct, container for the event type and its related values.
+ * Depending on the event type, either pipe or port will be filled.
+ * Pipeline related events (like buffer/frame events) will return a valid and filled pipe handle.
+ * For non pipeline related events (but i.e. stream specific, like EOF event), the port will be
+ * filled.
+ */
+struct ia_css_event {
+	struct ia_css_pipe    *pipe;
+	/**< Pipe handle on which event happened, NULL for non pipe related
+	     events. */
+	enum ia_css_event_type type;
+	/**< Type of Event, always valid/filled. */
+	uint8_t                port;
+	/**< Port number for EOF event (not valid for other events). */
+	uint8_t                exp_id;
+	/**< Exposure id for EOF/FRAME_TAGGED/FW_WARNING event (not valid for other events)
+	     The exposure ID is unique only within a logical stream and it is
+	     only generated on systems that have an input system (such as 2400
+	     and 2401).
+	     Most outputs produced by the CSS are tagged with an exposure ID.
+	     This allows users of the CSS API to keep track of which buffer
+	     was generated from which sensor output frame. This includes:
+	     EOF event, output frames, 3A statistics, DVS statistics and
+	     sensor metadata.
+	     Exposure IDs start at IA_CSS_MIN_EXPOSURE_ID, increment by one
+	     until IA_CSS_MAX_EXPOSURE_ID is reached, after that they wrap
+	     around to IA_CSS_MIN_EXPOSURE_ID again.
+	     Note that in case frames are dropped, this will not be reflected
+	     in the exposure IDs. Therefor applications should not use this
+	     to detect frame drops. */
+	uint32_t               fw_handle;
+	/**< Firmware Handle for ACC_STAGE_COMPLETE event (not valid for other
+	     events). */
+	enum ia_css_fw_warning fw_warning;
+	/**< Firmware warning code, only for WARNING events. */
+	uint8_t                fw_assert_module_id;
+	/**< Firmware module id, only for ASSERT events, should be logged by driver. */
+	uint16_t               fw_assert_line_no;
+	/**< Firmware line number, only for ASSERT events, should be logged by driver. */
+	clock_value_t	       timer_data;
+	/**< For storing the full 32-bit of the timer value. Valid only for TIMER
+	     event */
+	uint8_t                timer_code;
+	/**< For storing the code of the TIMER event. Valid only for
+	     TIMER event */
+	uint8_t                timer_subcode;
+	/**< For storing the subcode of the TIMER event. Valid only
+	     for TIMER event */
+};
+
+/** @brief Dequeue a PSYS event from the CSS system.
+ *
+ * @param[out]	event   Pointer to the event struct which will be filled by
+ *                      this function if an event is available.
+ * @return		IA_CSS_ERR_QUEUE_IS_EMPTY if no events are
+ *			available or
+ *			IA_CSS_SUCCESS otherwise.
+ *
+ * This function dequeues an event from the PSYS event queue. The queue is
+ * between the Host CPU and the CSS system. This function can be
+ * called after an interrupt has been generated that signalled that a new event
+ * was available and can be used in a polling-like situation where the NO_EVENT
+ * return value is used to determine whether an event was available or not.
+ */
+enum ia_css_err
+ia_css_dequeue_psys_event(struct ia_css_event *event);
+
+/** @brief Dequeue an event from the CSS system.
+ *
+ * @param[out]	event   Pointer to the event struct which will be filled by
+ *                      this function if an event is available.
+ * @return		IA_CSS_ERR_QUEUE_IS_EMPTY if no events are
+ *			available or
+ *			IA_CSS_SUCCESS otherwise.
+ *
+ * deprecated{Use ia_css_dequeue_psys_event instead}.
+ * Unless the isys event queue is explicitly enabled, this function will
+ * dequeue both isys (EOF) and psys events (all others).
+ */
+enum ia_css_err
+ia_css_dequeue_event(struct ia_css_event *event);
+
+/** @brief Dequeue an ISYS event from the CSS system.
+ *
+ * @param[out]	event   Pointer to the event struct which will be filled by
+ *                      this function if an event is available.
+ * @return		IA_CSS_ERR_QUEUE_IS_EMPTY if no events are
+ *			available or
+ *			IA_CSS_SUCCESS otherwise.
+ *
+ * This function dequeues an event from the ISYS event queue. The queue is
+ * between host and the CSS system.
+ * Unlike the ia_css_dequeue_event() function, this function can be called
+ * directly from an interrupt service routine (ISR) and it is safe to call
+ * this function in parallel with other CSS API functions (but only one
+ * call to this function should be in flight at any point in time).
+ *
+ * The reason for having the ISYS events separate is to prevent them from
+ * incurring additional latency due to locks being held by other CSS API
+ * functions.
+ */
+enum ia_css_err
+ia_css_dequeue_isys_event(struct ia_css_event *event);
+
+#endif /* __IA_CSS_EVENT_PUBLIC_H */