The Luminary variant of the PL061 has registers GPIOPUR and GPIOPDR
which lets the guest configure whether the GPIO lines are pull-up,
pull-down, or truly floating. Instead of assuming all lines are pulled
high, honour the PUR and PDR registers.
For the plain PL061, continue to assume that lines have an external
pull-up resistor, as we did before.
The stellaris board actually relies on this behaviour -- the CD line
of the ssd0323 display device is connected to GPIO output C7, and it
is only because of a different bug which we're about to fix that we
weren't incorrectly driving this line high on reset and putting the
ssd0323 into data mode.
Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
---
hw/gpio/pl061.c | 58 +++++++++++++++++++++++++++++++++++++++++---
hw/gpio/trace-events | 2 +-
2 files changed, 55 insertions(+), 5 deletions(-)