Rewrite the assembly serial_early_puts() helper to place the strings
in the .rodata section rather than embedding them directly in the
.text section. Using .text is a little simpler, but it doesn't let
people execute out of internal L1 sram (since core reads don't work
on those regions).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Since the serial struct declares the sizes for us, no need to hardcode
them in the accessor functions. Let the bfin_{read,write} helpers do
it for us.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This brings CONFIG_SERIAL_MULTI support to the Blackfin on-chip UARTs.
Ends up adding only ~512bytes per additional UART.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Use the new portmux framework to handle the details when possible.
Unfortunately, we cannot yet use this in the standalone initialization
logic, so we need to keep around the old portmux writes for now.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
When the clock functions were changed to use cached values (and thereby
avoiding expensive math functions), early serial debug broke because the
baud programming is called before external memory is available.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
There is no code change here, just new comments, but this keeps me from
having to do another audit from scratch in the future.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Previously, booting over the UART required the baud rate to be known ahead
of time. Using a bit of tricky simple math, we can calculate the new board
rate based on the old divisors.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org>
Some devices have no UART device pulled out, so allow people to disable the
driver completely in favor of other methods (like JTAG-console).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
We should use the algorithm in the Linux kernel so that the UART divisor
calculation is more accurate. It also fixes problems on some picky UARTs
that have sampling anomalies.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
All of the duplicated code for Blackfin processors and boot modes have been
unified. After all, the core is the same for all processors, just the
peripheral set differs (which gets handled in the drivers).
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Mike Frysinger
Peter Tyser