BCM270x: Add USB controller to Device Tree

BCM270x: Move vc_mem

Add Device Tree support to dwc_otg driver.
Add device to Device Tree.
Don't add platform devices when booting in DT mode.

Tested on Pi1 and Pi2 with and without DT.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Add Device Tree overlay for 3.5" display by tinylcd.com

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Add a new trailer field indicating whether this is an ARCH_BCM2835
build, as opposed to MACH_BCM2708/9. If the loader finds this flag
is set it changes the default base dtb file name from bcm270x...
to bcm283y...

Also update knlinfo to show the status of the field.

Make the vc_mem module available for ARCH_BCM2835 by moving it.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

The Raspberry Pi firmware looks for a trailer on the kernel image to
determine whether it was compiled with Device Tree support enabled.
If the firmware finds a kernel without this trailer, or which has a
trailer indicating that it isn't DT-capable, it disables DT support
and reverts to using ATAGs.

The mkknlimg utility adds that trailer, having first analysed the
image to look for signs of DT support and the kernel version string.

knlinfo displays the contents of the trailer in the given kernel image.

BCM270x: Move power module

device-tree: spi: make spi-bcm2835 the default spi driver and prepare...

For backwards compatibility, allow the built-in ALSA driver to be enabled
either by loading the module from /etc/modules or by enabling the "/audio"
node in DT.

* make spi-bcm2835 the default driver for spi
* add a fallback spi-bcm2708 overlay
* add dma entries to device tree for future updates
* add default cs-gpios entry showing how to extend the number of chip-selects.

Signed-off-by: Martin Sperl <kernel@martin.sperl.org>

bcm270x: add dtparam to enable/disable onboard sound device

The audio node is enabled by default and can be disabled
with dtparam=audio=off in config.txt

Add generic support for the ADS7846 touch controller.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

The VideoCore bootloader concatenates the bootargs property together
with /boot/cmdline.txt and includes it's own set of options.
Set bootargs to an empty string to behave like BCM270x.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Make the power module available on ARCH_BCM2835 by moving it.
The module turns on USB power making it possible to boot
ARCH_BCM2835 directly with the VC bootloader.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Provide a __copy_from_user that uses memcpy. On BCM2708, use
optimised memcpy/memmove/memcmp/memset implementations.

Add onboard sound device to Device Tree

Add onboard sound device to Device Tree.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Add Device Tree support to alsa driver.
Add device to Device Tree.
Don't add platform devices when booting in DT mode.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Enable vchiq on ARCH_BCM2835

Add vchiq to Device Tree. There are no kernel users yet,
but it's available to userspace (vcgencmd).

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Turn vchiq into a driver and stop hardcoding resources.
Use devm_* functions in probe path to simplify cleanup.
A global variable is used to hold the register address. This is done
to keep this patch as small as possible.
Also make available on ARCH_BCM2835.
Based on work by Lubomir Rintel.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Prepare to turn the vchiq module into a driver.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

bcm2708_fb: Add ARCH_BCM2835 support

Enable the bcm2708 framebuffer driver.
Disable the simple framebuffer driver, which matches the
device handed over by u-boot.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

Add framebuffer device to Device Tree.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

There exists a tiny MMU, configurable only by the VC (running the
closed firmware), which maps from the ARM's physical addresses to bus
addresses.  These bus addresses determine the caching behavior in the
VC's L1/L2 (note: separate from the ARM's L1/L2) according to the top
2 bits.  The bits in the bus address mean:

From the VideoCore processor:
0x0... L1 and L2 cache allocating and coherent
0x4... L1 non-allocating, but coherent. L2 allocating and coherent
0x8... L1 non-allocating, but coherent. L2 non-allocating, but coherent
0xc... SDRAM alias. Cache is bypassed. Not L1 or L2 allocating or coherent

From the GPU peripherals (note: all peripherals bypass the L1
cache. The ARM will see this view once through the VC MMU):
0x0... Do not use
0x4... L1 non-allocating, and incoherent. L2 allocating and coherent.
0x8... L1 non-allocating, and incoherent. L2 non-allocating, but coherent
0xc... SDRAM alias. Cache is bypassed. Not L1 or L2 allocating or coherent

The 2835 firmware always configures the MMU to turn ARM physical
addresses with 0x0 top bits to 0x4, meaning present in L2 but
incoherent with L1.  However, any bus addresses we were generating in
the kernel to be passed to a device had 0x0 bits.  That would be a
reserved (possibly totally incoherent) value if sent to a GPU
peripheral like USB, or L1 allocating if sent to the VC (like a
firmware property request).  By setting dma-ranges, all of the devices
below it get a dev->dma_pfn_offset, so that dma_alloc_coherent() and
friends return addresses with 0x4 bits and avoid cache incoherency.

This matches the behavior in the downstream 2708 kernel (see
BUS_OFFSET in arch/arm/mach-bcm2708/include/mach/memory.h).

Signed-off-by: Eric Anholt <eric@anholt.net>
Tested-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Cc: popcornmix@gmail.com

Add bcm2708-fb to Device Tree and don't add the
platform device when booting in DT mode.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>

This header file can be removed since there are no more users.

Signed-off-by: Noralf Trønnes <noralf@tronnes.org>