RTEMS | bsps/xilinx-zynq: Add QSPI flash driver (!295)

[Aaron Nyholm (@eagleirony)]

Aaron Nyholm commented on a discussion on bsps/arm/xilinx-zynq/dev/spi/zynq-qspi-flash-transfer.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/295#note_114546

 > +#include <rtems.h>
 > +#include <stdint.h>
 > +
 > +#include <dev/spi/zynq-qspi-flash-defs.h>
 > +
 > +/*
 > + * The following variables are shared between non-interrupt processing and
 > + * interrupt processing such that they must be global.
 > + */
 > +rtems_id transfer_task;
 > +
 > +__attribute__((weak)) void zqspi_write_unlock(zqspiflash *driver) {
 > +}
 > +
 > +__attribute__((weak)) void zqspi_write_lock(zqspiflash *driver) {
 > +}

They're used in `zynq-qspi-flash.c`. They're there to allow apps to run some code before and after a flash write in the case of the flash chip having the WriteEnable pin tied to a GPIO pin.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/295#note_114546
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