bcm2708 vchiq driver

Signed-off-by: popcornmix <popcornmix@gmail.com>

vchiq: create_pagelist copes with vmalloc memory

Signed-off-by: Daniel Stone <daniels@collabora.com>

vchiq: fix the shim message release

Signed-off-by: Daniel Stone <daniels@collabora.com>

vchiq: export additional symbols

Signed-off-by: Daniel Stone <daniels@collabora.com>

VCHIQ: Make service closure fully synchronous (drv)

This is one half of a two-part patch, the other half of which is to
the vchiq_lib user library. With these patches, calls to
vchiq_close_service and vchiq_remove_service won't return until any
associated callbacks have been delivered to the callback thread.

VCHIQ: Add per-service tracing

The new service option VCHIQ_SERVICE_OPTION_TRACE is a boolean that
toggles tracing for the specified service.

This commit also introduces vchi_service_set_option and the associated
option VCHI_SERVICE_OPTION_TRACE.

vchiq: Make the synchronous-CLOSE logic more tolerant
vchiq: Avoid high load when blocked and unkillable

vchiq: Include SIGSTOP and SIGCONT in list of signals not-masked by vchiq to allow gdb to work
cma: Add vc_cma driver to enable use of CMA

Signed-off-by: popcornmix <popcornmix@gmail.com>
bcm2708: alsa sound driver

    Signed-off-by: popcornmix <popcornmix@gmail.com>

alsa: add mmap support and some cleanups to bcm2835 ALSA driver

snd-bcm2835: Add support for spdif/hdmi passthrough

This adds a dedicated subdevice which can be used for passthrough of non-audio
formats (ie encoded a52) through the hdmi audio link. In addition to this
driver extension an appropriate card config is required to make alsa-lib
support the AES parameters for this device.

snd-bcm2708: Add mutex, improve logging

Fix for ALSA driver crash

Avoids an issue when closing and opening vchiq where a message can arrive before service handle has been written

alsa: reduce severity of expected warning message
Add hwrng (hardware random number generator) driver
lirc: added support for RaspberryPi GPIO

lirc_rpi: Use read_current_timer to determine transmitter delay. Thanks to jjmz and others
See: https://github.com/raspberrypi/linux/issues/525

lirc: Remove restriction on gpio pins that can be used with lirc

Compute Module, for example could use different pins

lirc_rpi: Add parameter to specify input pin pull

Depending on the connected IR circuitry it might be desirable to change the
gpios internal pull from it pull-down default behaviour. Add a module
parameter to allow the user to set it explicitly.

Signed-off-by: Julian Scheel <julian@jusst.de>
Add cpufreq driver
Added hwmon/thermal driver for reporting core temperature. Thanks Dorian
Allow mac address to be set in smsc95xx

Signed-off-by: popcornmix <popcornmix@gmail.com>
Add Chris Boot's i2c and spi drivers.

i2c-bcm2708: fixed baudrate

Fixed issue where the wrong CDIV value was set for baudrates below 3815 Hz (for 250MHz bus clock).
In that case the computed CDIV value was more than 0xffff. However the CDIV register width is only 16 bits.
This resulted in incorrect setting of CDIV and higher baudrate than intended.
Example: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0x1704 -> 42430Hz
After correction: 3500Hz -> CDIV=0x11704 -> CDIV(16bit)=0xffff -> 3815Hz
The correct baudrate is shown in the log after the cdiv > 0xffff correction.
Perform I2C combined transactions when possible

Perform I2C combined transactions whenever possible, within the
restrictions of the Broadcomm Serial Controller.

Disable DONE interrupt during TA poll

Prevent interrupt from being triggered if poll is missed and transfer
starts and finishes.

i2c: Make combined transactions optional and disabled by default
enabling the realtime clock 1-wire chip DS1307 and 1-wire on GPIO4 (as a module)

1-wire: Add support for configuring pin for w1-gpio kernel module
See: https://github.com/raspberrypi/linux/pull/457

Add bitbanging pullups, use them for w1-gpio

Allows parasite power to work, uses module option pullup=1

bcm2708: Ensure 1-wire pullup is disabled by default, and expose as module parameter

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

w1-gpio: Add gpiopin module parameter and correctly free up gpio pull-up pin, if set

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>
Added Device IDs for August DVB-T 205
config: add missing options from 3.6.y kernel
config: Enable CONFIG_MEMCG, but leave it disabled (due to memory cost). Enable with cgroup_enable=memory.
Add FIQ patch to dwc_otg driver. Enable with dwc_otg.fiq_fix_enable=1. Should give about 10% more ARM performance.
Thanks to Gordon and Costas

Avoid dynamic memory allocation for channel lock in USB driver. Thanks ddv2005.

Add NAK holdoff scheme. Enabled by default, disable with dwc_otg.nak_holdoff_enable=0. Thanks gsh

Make sure we wait for the reset to finish

dwc_otg: fix bug in dwc_otg_hcd.c resulting in silent kernel
	 memory corruption, escalating to OOPS under high USB load.

dwc_otg: Fix unsafe access of QTD during URB enqueue

In dwc_otg_hcd_urb_enqueue during qtd creation, it was possible that the
transaction could complete almost immediately after the qtd was assigned
to a host channel during URB enqueue, which meant the qtd pointer was no
longer valid having been completed and removed. Usually, this resulted in
an OOPS during URB submission. By predetermining whether transactions
need to be queued or not, this unsafe pointer access is avoided.

This bug was only evident on the Pi model A where a device was attached
that had no periodic endpoints (e.g. USB pendrive or some wlan devices).

dwc_otg: Fix incorrect URB allocation error handling

If the memory allocation for a dwc_otg_urb failed, the kernel would OOPS
because for some reason a member of the *unallocated* struct was set to
zero. Error handling changed to fail correctly.

dwc_otg: fix potential use-after-free case in interrupt handler

If a transaction had previously aborted, certain interrupts are
enabled to track error counts and reset where necessary. On IN
endpoints the host generates an ACK interrupt near-simultaneously
with completion of transfer. In the case where this transfer had
previously had an error, this results in a use-after-free on
the QTD memory space with a 1-byte length being overwritten to
0x00.

dwc_otg: add handling of SPLIT transaction data toggle errors

Previously a data toggle error on packets from a USB1.1 device behind
a TT would result in the Pi locking up as the driver never handled
the associated interrupt. Patch adds basic retry mechanism and
interrupt acknowledgement to cater for either a chance toggle error or
for devices that have a broken initial toggle state (FT8U232/FT232BM).

dwc_otg: implement tasklet for returning URBs to usbcore hcd layer

The dwc_otg driver interrupt handler for transfer completion will spend
a very long time with interrupts disabled when a URB is completed -
this is because usb_hcd_giveback_urb is called from within the handler
which for a USB device driver with complicated processing (e.g. webcam)
will take an exorbitant amount of time to complete. This results in
missed completion interrupts for other USB packets which lead to them
being dropped due to microframe overruns.

This patch splits returning the URB to the usb hcd layer into a
high-priority tasklet. This will have most benefit for isochronous IN
transfers but will also have incidental benefit where multiple periodic
devices are active at once.

dwc_otg: fix NAK holdoff and allow on split transactions only

This corrects a bug where if a single active non-periodic endpoint
had at least one transaction in its qh, on frnum == MAX_FRNUM the qh
would get skipped and never get queued again. This would result in
a silent device until error detection (automatic or otherwise) would
either reset the device or flush and requeue the URBs.

Additionally the NAK holdoff was enabled for all transactions - this
would potentially stall a HS endpoint for 1ms if a previous error state
enabled this interrupt and the next response was a NAK. Fix so that
only split transactions get held off.

dwc_otg: Call usb_hcd_unlink_urb_from_ep with lock held in completion handler

usb_hcd_unlink_urb_from_ep must be called with the HCD lock held.  Calling it
asynchronously in the tasklet was not safe (regression in
c4564d4a1a0a9b10d4419e48239f5d99e88d2667).

This change unlinks it from the endpoint prior to queueing it for handling in
the tasklet, and also adds a check to ensure the urb is OK to be unlinked
before doing so.

NULL pointer dereference kernel oopses had been observed in usb_hcd_giveback_urb
when a USB device was unplugged/replugged during data transfer.  This effect
was reproduced using automated USB port power control, hundreds of replug
events were performed during active transfers to confirm that the problem was
eliminated.

USB fix using a FIQ to implement split transactions

This commit adds a FIQ implementaion that schedules
the split transactions using a FIQ so we don't get
held off by the interrupt latency of Linux

dwc_otg: fix device attributes and avoid kernel warnings on boot

dcw_otg: avoid logging function that can cause panics

See: https://github.com/raspberrypi/firmware/issues/21
Thanks to cleverca22 for fix

dwc_otg: mask correct interrupts after transaction error recovery

The dwc_otg driver will unmask certain interrupts on a transaction
that previously halted in the error state in order to reset the
QTD error count. The various fine-grained interrupt handlers do not
consider that other interrupts besides themselves were unmasked.

By disabling the two other interrupts only ever enabled in DMA mode
for this purpose, we can avoid unnecessary function calls in the
IRQ handler. This will also prevent an unneccesary FIQ interrupt
from being generated if the FIQ is enabled.

dwc_otg: fiq: prevent FIQ thrash and incorrect state passing to IRQ

In the case of a transaction to a device that had previously aborted
due to an error, several interrupts are enabled to reset the error
count when a device responds. This has the side-effect of making the
FIQ thrash because the hardware will generate multiple instances of
a NAK on an IN bulk/interrupt endpoint and multiple instances of ACK
on an OUT bulk/interrupt endpoint. Make the FIQ mask and clear the
associated interrupts.

Additionally, on non-split transactions make sure that only unmasked
interrupts are cleared. This caused a hard-to-trigger but serious
race condition when you had the combination of an endpoint awaiting
error recovery and a transaction completed on an endpoint - due to
the sequencing and timing of interrupts generated by the dwc_otg core,
it was possible to confuse the IRQ handler.

Fix function tracing

dwc_otg: whitespace cleanup in dwc_otg_urb_enqueue

dwc_otg: prevent OOPSes during device disconnects

The dwc_otg_urb_enqueue function is thread-unsafe. In particular the
access of urb->hcpriv, usb_hcd_link_urb_to_ep, dwc_otg_urb->qtd and
friends does not occur within a critical section and so if a device
was unplugged during activity there was a high chance that the
usbcore hub_thread would try to disable the endpoint with partially-
formed entries in the URB queue. This would result in BUG() or null
pointer dereferences.

Fix so that access of urb->hcpriv, enqueuing to the hardware and
adding to usbcore endpoint URB lists is contained within a single
critical section.

dwc_otg: prevent BUG() in TT allocation if hub address is > 16

A fixed-size array is used to track TT allocation. This was
previously set to 16 which caused a crash because
dwc_otg_hcd_allocate_port would read past the end of the array.

This was hit if a hub was plugged in which enumerated as addr > 16,
due to previous device resets or unplugs.

Also add #ifdef FIQ_DEBUG around hcd->hub_port_alloc[], which grows
to a large size if 128 hub addresses are supported. This field is
for debug only for tracking which frame an allocate happened in.

dwc_otg: make channel halts with unknown state less damaging

If the IRQ received a channel halt interrupt through the FIQ
with no other bits set, the IRQ would not release the host
channel and never complete the URB.

Add catchall handling to treat as a transaction error and retry.

dwc_otg: fiq_split: use TTs with more granularity

This fixes certain issues with split transaction scheduling.

- Isochronous multi-packet OUT transactions now hog the TT until
  they are completed - this prevents hubs aborting transactions
  if they get a periodic start-split out-of-order
- Don't perform TT allocation on non-periodic endpoints - this
  allows simultaneous use of the TT's bulk/control and periodic
  transaction buffers

This commit will mainly affect USB audio playback.

dwc_otg: fix potential sleep while atomic during urb enqueue

Fixes a regression introduced with eb1b482a. Kmalloc called from
dwc_otg_hcd_qtd_add / dwc_otg_hcd_qtd_create did not always have
the GPF_ATOMIC flag set. Force this flag when inside the larger
critical section.

dwc_otg: make fiq_split_enable imply fiq_fix_enable

Failing to set up the FIQ correctly would result in
"IRQ 32: nobody cared" errors in dmesg.

dwc_otg: prevent crashes on host port disconnects

Fix several issues resulting in crashes or inconsistent state
if a Model A root port was disconnected.

- Clean up queue heads properly in kill_urbs_in_qh_list by
  removing the empty QHs from the schedule lists
- Set the halt status properly to prevent IRQ handlers from
  using freed memory
- Add fiq_split related cleanup for saved registers
- Make microframe scheduling reclaim host channels if
  active during a disconnect
- Abort URBs with -ESHUTDOWN status response, informing
  device drivers so they respond in a more correct fashion
  and don't try to resubmit URBs
- Prevent IRQ handlers from attempting to handle channel
  interrupts if the associated URB was dequeued (and the
  driver state was cleared)

dwc_otg: prevent leaking URBs during enqueue

A dwc_otg_urb would get leaked if the HCD enqueue function
failed for any reason. Free the URB at the appropriate points.

dwc_otg: Enable NAK holdoff for control split transactions

Certain low-speed devices take a very long time to complete a
data or status stage of a control transaction, producing NAK
responses until they complete internal processing - the USB2.0
spec limit is up to 500mS. This causes the same type of interrupt
storm as seen with USB-serial dongles prior to c8edb238.

In certain circumstances, usually while booting, this interrupt
storm could cause SD card timeouts.

dwc_otg: Fix for occasional lockup on boot when doing a USB reset

dwc_otg: Don't issue traffic to LS devices in FS mode

Issuing low-speed packets when the root port is in full-speed mode
causes the root port to stop responding. Explicitly fail when
enqueuing URBs to a LS endpoint on a FS bus.

Fix ARM architecture issue with local_irq_restore()

If local_fiq_enable() is called before a local_irq_restore(flags) where
the flags variable has the F bit set, the FIQ will be erroneously disabled.

Fixup arch_local_irq_restore to avoid trampling the F bit in CPSR.

Also fix some of the hacks previously implemented for previous dwc_otg
incarnations.
dwc_otg: fiq_fsm: Base commit for driver rewrite

This commit removes the previous FIQ fixes entirely and adds fiq_fsm.

This rewrite features much more complete support for split transactions
and takes into account several OTG hardware bugs. High-speed
isochronous transactions are also capable of being performed by fiq_fsm.

All driver options have been removed and replaced with:
  - dwc_otg.fiq_enable (bool)
  - dwc_otg.fiq_fsm_enable (bool)
  - dwc_otg.fiq_fsm_mask (bitmask)
  - dwc_otg.nak_holdoff (unsigned int)

Defaults are specified such that fiq_fsm behaves similarly to the
previously implemented FIQ fixes.

fiq_fsm: Push error recovery into the FIQ when fiq_fsm is used

If the transfer associated with a QTD failed due to a bus error, the HCD
would retry the transfer up to 3 times (implementing the USB2.0
three-strikes retry in software).

Due to the masking mechanism used by fiq_fsm, it is only possible to pass
a single interrupt through to the HCD per-transfer.

In this instance host channels would fall off the radar because the error
reset would function, but the subsequent channel halt would be lost.

Push the error count reset into the FIQ handler.

fiq_fsm: Implement timeout mechanism

For full-speed endpoints with a large packet size, interrupt latency
runs the risk of the FIQ starting a transaction too late in a full-speed
frame. If the device is still transmitting data when EOF2 for the
downstream frame occurs, the hub will disable the port. This change is
not reflected in the hub status endpoint and the device becomes
unresponsive.

Prevent high-bandwidth transactions from being started too late in a
frame. The mechanism is not guaranteed: a combination of bit stuffing
and hub latency may still result in a device overrunning.

fiq_fsm: fix bounce buffer utilisation for Isochronous OUT

Multi-packet isochronous OUT transactions were subject to a few bounday
bugs. Fix them.

Audio playback is now much more robust: however, an issue stands with
devices that have adaptive sinks - ALSA plays samples too fast.

dwc_otg: Return full-speed frame numbers in HS mode

The frame counter increments on every *microframe* in high-speed mode.
Most device drivers expect this number to be in full-speed frames - this
caused considerable confusion to e.g. snd_usb_audio which uses the
frame counter to estimate the number of samples played.

fiq_fsm: save PID on completion of interrupt OUT transfers

Also add edge case handling for interrupt transports.

Note that for periodic split IN, data toggles are unimplemented in the
OTG host hardware - it unconditionally accepts any PID.

fiq_fsm: add missing case for fiq_fsm_tt_in_use()

Certain combinations of bitrate and endpoint activity could
result in a periodic transaction erroneously getting started
while the previous Isochronous OUT was still active.

fiq_fsm: clear hcintmsk for aborted transactions

Prevents the FIQ from erroneously handling interrupts
on a timed out channel.

fiq_fsm: enable by default

fiq_fsm: fix dequeues for non-periodic split transactions

If a dequeue happened between the SSPLIT and CSPLIT phases of the
transaction, the HCD would never receive an interrupt.

fiq_fsm: Disable by default

fiq_fsm: Handle HC babble errors

The HCTSIZ transfer size field raises a babble interrupt if
the counter wraps. Handle the resulting interrupt in this case.

dwc_otg: fix interrupt registration for fiq_enable=0

Additionally make the module parameter conditional for wherever
hcd->fiq_state is touched.

fiq_fsm: Enable by default
bcm2835: add v4l2 camera device

- Supports raw YUV capture, preview, JPEG and H264.
- Uses videobuf2 for data transfer, using dma_buf.
- Uses 3.6.10 timestamping
- Camera power based on use
- Uses immutable input mode on video encoder

Signed-off-by: Daniel Stone <daniels@collabora.com>
Signed-off-by: Luke Diamand <luked@broadcom.com>
V4L2: Fixes from 6by9

V4L2: Fix EV values. Add manual shutter speed control

V4L2 EV values should be in units of 1/1000. Corrected.
Add support for V4L2_CID_EXPOSURE_ABSOLUTE which should
give manual shutter control. Requires manual exposure mode
to be selected first.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Correct JPEG Q-factor range

Should be 1-100, not 0-100

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix issue of driver jamming if STREAMON failed.

Fix issue where the driver was left in a partially enabled
state if STREAMON failed, and would then reject many IOCTLs
as it thought it was streaming.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix ISO controls.

Driver was passing the index to the GPU, and not the desired
ISO value.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add flicker avoidance controls

Add support for V4L2_CID_POWER_LINE_FREQUENCY to set flicker
avoidance frequencies.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add support for frame rate control.

Add support for frame rate (or time per frame as V4L2
inverts it) control via s_parm.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Improve G_FBUF handling so we pass conformance

Return some sane numbers for get framebuffer so that
we pass conformance.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix information advertised through g_vidfmt

Width and height were being stored based on incorrect
values.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add support for inline H264 headers

Add support for V4L2_CID_MPEG_VIDEO_REPEAT_SEQ_HEADER
to control H264 inline headers.
Requires firmware fix to work correctly, otherwise format
has to be set to H264 before this parameter is set.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix JPEG timestamp issue

JPEG images were coming through from the GPU with timestamp
of 0. Detect this and give current system time instead
of some invalid value.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix issue when switching down JPEG resolution.

JPEG buffer size calculation is based on input resolution.
Input resolution was being configured after output port
format. Caused failures if switching from one JPEG resolution
to a smaller one.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Enable MJPEG encoding

Requires GPU firmware update to support MJPEG encoder.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Correct flag settings for compressed formats

Set flags field correctly on enum_fmt_vid_cap for compressed
image formats.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: H264 profile & level ctrls, FPS control and auto exp pri

Several control handling updates.
H264 profile and level controls.
Timeperframe/FPS reworked to add V4L2_CID_EXPOSURE_AUTO_PRIORITY to
select whether AE is allowed to override the framerate specified.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Correct BGR24 to RGB24 in format table

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add additional pixel formats. Correct colourspace

Adds the other flavours of YUYV, and NV12.
Corrects the overlay advertised colourspace.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Drop logging msg from info to debug

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Initial pass at scene modes.

Only supports exposure mode and metering modes.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add manual white balance control.

Adds support for V4L2_CID_RED_BALANCE and
V4L2_CID_BLUE_BALANCE. Only has an effect if
V4L2_CID_AUTO_N_PRESET_WHITE_BALANCE has
V4L2_WHITE_BALANCE_MANUAL selected.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

config: Enable V4L / MMAL driver

V4L2: Increase the MMAL timeout to 3sec

MJPEG codec flush is now taking longer and results
in a kernel panic if the driver has stopped waiting for
the result when it finally completes.
Increase the timeout value from 1 to 3secs.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add support for setting H264_I_PERIOD

Adds support for the parameter V4L2_CID_MPEG_VIDEO_H264_I_PERIOD
to set the frequency with which I frames are produced.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Enable GPU function for removing padding from images.

GPU can now support arbitrary strides, although may require
additional processing to achieve it. Enable this feature
so that the images delivered are the size requested.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add support for V4L2_PIX_FMT_BGR32

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Set the colourspace to avoid odd YUV-RGB conversions

Removes the amiguity from the conversion routines and stops
them dropping back to the SD vs HD choice of coeffs.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Make video/still threshold a run-time param

Move the define for at what resolution the driver
switches from a video mode capture to a stills mode
capture to module parameters.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Fix incorrect pool sizing

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add option to disable enum_framesizes.

Gstreamer's handling of a driver that advertises
V4L2_FRMSIZE_TYPE_STEPWISE to define the supported
resolutions is broken. See bug
https://bugzilla.gnome.org/show_bug.cgi?id=726521

Optional parameter of gst_v4l2src_is_broken added.
If non-zero, the driver claims not to support that
ioctl, and gstreamer should be happy again (it
guesses a set of defaults for itself).

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Add support for more image formats

Adds YVU420 (YV12), YVU420SP (NV21), and BGR888.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>

V4L2: Extend range for V4L2_CID_MPEG_VIDEO_H264_I_PERIOD

Request to extend the range from the fairly arbitrary
1000 frames (33 seconds at 30fps). Extend out to the
max range supported (int32 value).
Also allow 0, which is handled by the codec as only
send an I-frame on the first frame and never again.
There may be an exception if it detects a significant
scene change, but there's no easy way around that.

Signed-off-by: Dave Stevenson <dsteve@broadcom.com>
dmaengine: Add support for BCM2708

Add support for DMA controller of BCM2708 as used in the Raspberry Pi.
Currently it only supports cyclic DMA.

Signed-off-by: Florian Meier <florian.meier@koalo.de>

dmaengine: expand functionality by supporting scatter/gather transfers sdhci-bcm2708 and dma.c: fix for LITE channels