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author | rwatson <rwatson@FreeBSD.org> | 2012-08-25 11:07:43 +0000 |
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committer | rwatson <rwatson@FreeBSD.org> | 2012-08-25 11:07:43 +0000 |
commit | 57bdf1f3160c3bad78968872120cea0e37a94bf1 (patch) | |
tree | e0ce5c060681a6450bf378f148e6dc9425f67f7b /sys/dev/altera/sdcard | |
parent | d5129fde3c8f2b0e1d85049892dbcc47bd1be041 (diff) | |
download | FreeBSD-src-57bdf1f3160c3bad78968872120cea0e37a94bf1.zip FreeBSD-src-57bdf1f3160c3bad78968872120cea0e37a94bf1.tar.gz |
Add altera_avgen(4), a generic device driver to be used by hard and soft
CPU cores on Altera FPGAs. The device driver allows memory-mapped devices
on Altera's Avalon SoC bus to be exported to userspace via device nodes.
device.hints directories dictate device name, permissible access methods,
physical address and length, and I/O alignment. Devices can be accessed
using read(2)/write(2), but also memory mapped in userspace using mmap(2).
Devices attach directly to the Nexus, as is common for embedded device
drivers; in the future something more mature might be desirable. There is
currently no facility to support directing device-originated interrupts to
userspace.
In the future, this device driver may be renamed to socgen(4), as it can
in principle also be used with other system-on-chip (SoC) busses, such as
Axi on ASICs and FPGAs. However, we have only tested it on Avalon busses
with memory-mapped ROMs, frame buffers, etc.
Sponsored by: DARPA, AFRL
Diffstat (limited to 'sys/dev/altera/sdcard')
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