PIO FIFO debug flags and interrupt support#7502
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Fix a few issues discovered after testing the kernel API with a port of the userspace apitest app. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
pio_sm_get_dmactrl is the reverse of pio_sm_set_dmactrl. pio_sm_get_flags allows the FIFO error flags - txoverflow, rxunderflow, txstall and rxstall - to be polled, cleared, and optionally waited for. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
The PIO block exposes 2 assignable interrupts. Make them available to kernel and userspace PIO applications. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
The PIO hardware drives 2 interrupt lines - declare them. Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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Add support for querying and clearing the FIFO debug/error flags, and for using PIO interrupts, both within the kernel and from the userspace piolib. This needs an RP1 firmware update, and a piolib update for userspace support.