riscv: simplify timer interrupt handling

Just disable the timer interrupt and notify supervisor.
To receive another timer interrupt just set timecmp and
enable machine mode timer interrupt again.

TEST=Run linux on sifive unleashed

Change-Id: I5d693f872bd492c9d0017b514882a4cebd5ccadd
Signed-off-by: Philipp Hug <philipp@hug.cx>
Reviewed-on: https://review.coreboot.org/29340
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

0 files changed, 0 insertions, 0 deletions