Commit Graph

9 Commits

Author SHA1 Message Date
nwhitehorn
da172f222a Hints-only devices should have BUS_PROBE_NOWILDCARD set. We probably need
a better flag for this (in the driver metadata, for example).
2013-10-29 13:43:09 +00:00
rwatson
247875210d Merge Perforce changeset 219952 to head:
Make different bus attachments for Altera and Terasice
  device drivers share the same devclass_t.

Sponsored by:	DARPA, AFRL
2013-01-13 16:57:11 +00:00
rwatson
d4d853b37b Partially merge Perforce changeset 219944 to head:
Consistently use the vendor name "sri-cambridge" for device
  compatibility strings on the BERI platform.

Sponsored by:	DARPA, AFRL
2013-01-13 16:53:31 +00:00
rwatson
0ccb306ce9 Partially merge Perforce changeset 219938 to head:
Write FDT attachment for the Terasic MTL (multitouch LCD) driver.
  Exploit the fact that FDT allows multiple memory ranges to be
  assigned to a device, giving us a cleaner description than
  device.hints does.

Portions of this changeset that remove mtl from BERI device.hints and
add to DTS will be merged separately.

Sponsored by:	DARPA, AFRL
2013-01-13 16:27:56 +00:00
rwatson
22f6fb27d5 Merge Perforce changeset 219937 to head:
Copy Terasic MTL nexus bus attachment as a starting point for an
  FDT attachment for the same driver.

Sponsored by:	DARPA, AFRL
2013-01-13 16:21:51 +00:00
rwatson
8022ccffb5 Merge Perforce changeset 219922 to head:
Update nexus parts in copied DE4LED attachment to use FDT.

Sponsored by:	DARPA, AFRL
2013-01-13 15:12:35 +00:00
rwatson
e813c09dbf Merge Perforce changeset 219921 to head:
Copy DE4 LED nexus bus attachment as a starting point for an FDT
  attachment.

Sponsored by:	DARPA, AFRL
2013-01-13 15:10:27 +00:00
rwatson
5b348c0d21 Add terasic_de4led, a led(4) driver for the on-board 8-element LED on the
Terasic DE-4 board.  Allow LED configuration to be set using loader
tunables, not just from userspace, and preconfigure LED 8 as a kernel
heartbeat.  For now, this is a Nexus-attached, BERI-only driver, but it
could be used with other hard and soft cores on Altera FPGAs as well, in
principle.

Sponsored by:	DARPA, AFRL
2012-08-26 09:21:59 +00:00
rwatson
e08ff303c9 Add terasic_mtl(4), a device driver for the Terasic Multi-Touch LCD,
used with Terasic's DE-4 and other similar FPGA boards.  This display
is 800x480 and includes a capacitive touch screen, multi-touch
gesture recognition, etc.  This device driver depends on a Cambridge-
provided IP core that allows the MTL device to be hooked up to the
Altera Avalon SoC bus, and also provides a VGA-like text frame buffer.

Although it is compiled as a single device driver, it actually
implements a number of different device nodes exporting various
aspects of this multi-function device to userspace:

- Simple memory-mapped driver for the MTL 24-bit pixel frame buffer.
- Simple memory-mapped driver for the MTL control register set.
- Simple memory-mapped driver for the MTL text frame buffer.
- syscons attachment for the MTL text frame buffer.

This driver attaches directly to Nexus as is common for SoC device
drivers, and for the time being is considered BERI-specific, although
in principle it might be used with other hard and soft cores on
Altera FPGAs.

Control registers, including touchscreen input, are simply memory
mapped; in the future it would be desirable to hook up a more
conventional device node that can stream events, support kqueue(2)/
poll(2)/select(2), etc.

This is the first use of syscons on MIPS, as far as I can tell, and
there are some loose ends, such as an inability to use the hardware
cursor.  More fundamentally, it appears that syscons(4) assumes that
either a host is PC-like (i386, amd64) *or* it must be using a
graphical frame buffer.  While the MTL supports a graphical frame
buffer, using the text frame buffer is preferable for console use.
Fixing this issue in syscons(4) requires non-trivial changes, as the
text frame buffer support assumes that direct memory access can be
done to the text frame buffer without using bus accessor methods,
which is not the case on MIPS.  As a workaround for this, we instead
double-buffer and pretend to be a graphical frame buffer exposing
text accessor methods, leading to some quirks in syscons behaviour.

Sponsored by:	DARPA, AFRL
2012-08-25 22:35:29 +00:00