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274823 |
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21-Nov-2014 |
brooks |
Merge from CheriBSD:
commit 6d3c4c09226ad6bdd662e3e52489ef294a6ce298 Add terasic_mtl vt(4) framebuffer driver
terasic_mtl can be built with syscons(4) and vt(4) attachments, selected at compile time.
commit 33240259b47a7c990a5a88a19f133a5600432a4c Clear terasic_mtl text buffer on attach
commit d188c2d2412953f949624aa35cd07082830943c9 Update terasic vt(4) driver for FreeBSD r269783
commit d1cc54eee852fa4fc9d359d5bb2171d24ec73369 Safety belt to ensure vt(4) fb parameters are correct
commit 76e6d468ef45711d7952786095fc4791289ebb4b Improve terasic_mtl_vt fdt parsing
- Use OF_getencprop to avoid need for explicit endian handling (submitted by ray@freebsd.org) - Check for expected length and correct pointer type
commit 3e2524b8995ab66e8a9295e4c87cbc7126eeddf4 Correct device_printf usage
commit 9e53e3c8e0766414e25662c95b09cc51c92443b0 Switch framebuffer to match host endianness
Xorg and xf86-video-scfb work much better with a native-endian framebuffer.
commit 0f49259d596321ed85288ac0e1fb4ee1c966df48 Switch DE4 to vt(4) and enable kbdmux
commit 5bc96ebc89db7d134ad478335090c8477c1677c7 Add missing \n in device_printf calls
Submitted by: emaste Sponsored by: DARPA, AFRL
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239691 |
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25-Aug-2012 |
rwatson |
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
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