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3 Commits

Author SHA1 Message Date
adrian
0b7b7d9afb Use the UART frequency when programming the UART clock. 
This allows the 16550 support to work correctly on the upcoming
AR934x support.
 2013-07-21 03:54:39 +00:00
adrian
becc1654f8 For the AR933x UART, the serial clock is not the AHB clock, it's the 
reference clock.  So use that instead.
 2013-03-29 06:32:39 +00:00
adrian
7eebeb2d9d Bring over the initial, CPU-only UART support for the AR933x SoC. 
This implements the kernel glue needed (getc, putc, rxready).

This isn't a 16550 UART, even if the datasheet overview claims so.

The Linux ar933x support was used as a reference, however the uart code
is a reimplementation.

Attentive viewers will note that the uart code is based off of the ns8250
code and the UART bus code is a stubbed-out version of this.  I'll be
replacing it with non-stubbed versions soon, making this a fully featured
driver.

Tested:

* AP121 reference board (AR933x), booting through the mountroot> prompt;
  then doing some basic interactive tests in ddb.
 2013-03-28 19:27:06 +00:00