receives video memory address from VideoCore through property mailbox
channel. Older versions of firmware (and the one that is currently part
of sysutils/u-boot-rpi and sysutils/u-boot-rpi2) returned real physical
address, newer one returns VideoCore bus address, so we need to convert
it to actual physical address. this version works with both older and
newer interface.
missed. In other words, if a new request for an IPI is sent while the
previous request is being handled but the IPI is not cleared yet, the
clearing of the previous IPI request also clears the new one and the
handling is missed.
There are only three MP interrupt controllers in ARM now. Two of them are
fixed by this change, the third one is correct, probably only just by
accident. The fix is minimalistic as new interrupt framework is awaited.
It was debugged on RPi2 where missing IPI handling together with SCHED_ULE
led to situation in which tdq_ipipending was not cleared and so IPI_PREEMPT
was stopped to be sent. Various odditys were found related to slow system
response time like various events timed out, and slow console response.
Submitted by: Svatopluk Kraus <onwahe@gmail.com>
Reviewed by: loos, kib
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D3722
Use the BCM2835_MBOX_CHAN_PROP mbox channel to setup the framebuffer,
remove DMA code (its now done in bcm2835_mbox.c).
Also adjust the color palette when bcm2708_fb.fbswap is set. The
firmware used on RPi 2 uses this mode.
Tested on: RPi-B and RPi 2 with 16, 24 and 32bpp
Note: The 32bpp mode on RPi-B has the red and blue swapped, this
is a know problem (not a driver problem).
Use the BCM2835_MBOX_CHAN_PROP mbox channel to setup the framebuffer,
remove unused code and unnecessary includes.
Adjust the color palette when bcm2708_fb.fbswap is set on /chosen/bootargs
node of DTB. The firmware used on RPi 2 uses this mode.
Tested on: RPi-B and RPi 2 with 16, 24 and 32bpp
BCM2835_MBOX_CHAN_PROP channel. The old channel (BCM2835_MBOX_CHAN_FB)
seems deprecated on recent firmware versions and is causing a freeze on
RPi 2.
The actual changes in the framebuffer drivers will follow in subsequent
commits.
the Raspberry Pi B we support most of the devices are already supported,
however the base address has changed.
A few items are not working, or missing. The main ones are:
* DMA doesn't work in the sdhci driver.
* Enabling vchiq halts the boot, may be interrupt related.
* There is no U-Boot port yet so the DTB is embedded in the kernel.
The last point will make it difficult to boot FreeBSD, however there is
support for the Raspberry Pi 2 in the U-Boot git repo. As I have not tested
this it is left as an open task to create a port to build.
X-MFC: When the above issues are fixed
Sponsored by: ABT Systems Ltd
to get the default frequency of the sdhci device.
While here use a u_int to hold the frequency as it may be too large to fit
in a 32-bit signed integer. This is the case when we have a 250MHz clock.
been done by U-Boot. This allows the USB to work when we load the kernel
directly.
No dma sync is performed after these operations as the data we read/write
is not used by the cpu after the calls to the maimbox driver.
Differential Revision: https://reviews.freebsd.org/D1940
Reviewed by: imp, Michal Meloun (meloun AT miracle.cz)
MFC after: 1 Week
Sponsored by: ABT Systems Ltd
With this commit any of the GPIO pins can now be programmed to act as an
interrupt source for GPIO devices (i.e. limited to devices directly
attached to gpiobus - at least for now).
Differential Revision: https://reviews.freebsd.org/D1000
Allocate all four, we will use them soon.
Simplificate the allocation of memory and interrupt resources with a single
bus_alloc_resources() call instead of doing them separately.
Destroy the mutex in case of errors.
With this change, it is now possible to verify the pin function and level
of reserved pins (but not set them).
The use of reserved pins on Raspberry pi can lead to short circuits and
real damage to the SoC.
While here, remove duplicated code, make use of OF_getencprop_alloc()
instead of using fixed sized variables and reduce the dmesg spam by
printing reserved pin ranges (when possible) instead of printing each pin
in the range.
This doesn't actually change any behavior, because it just allows a 16-bit
read of the command register to return the correct value, and nothing
actually does a 16-bit read of that register.
sdhci controllers, such as the one on a Raspberry Pi, mishandle the signal
timing in high speed signaling mode, but run just fine in standard mode
with the bus running at frequencies between 25-50MHz (which shouldn't work).
This is the solution adopted by U-Boot and other OSes (linux and *BSD)
for the timeouts on Raspberry Pi boards with certain SD cards. Some
research shows that this quirk is also used on a few other boards, so the
fix is a generic quirk instead of being in the RPi-specific driver code.
This change is based on information discovered by Michal Meloun.
