On Wednesday 20 February 2002 21:53, gopi at india.tejasnetworks.com wrote:
> hi..
>
> We have an MPC860T based custom board.
>
> We wanted to control interrupt on one of the irqs by writing to SIMASK
> register using a small driver with two ioctls which will will do
> the following:
>
> // WRITE_MASK_IOCTL
> simask_write_ioctl(mask) {
> cli();
better use save_flags(flags); cli();
> (volatile unsigned int *)(IMMR + simask_offset) = mask;
You're missing a * operator here (don't know about your actual source code,
though...)
> written_value = *(volatile unsigned int *)(IMMR + simask_offset);
> sti();
better use restore_flags(flags)... and flags must be defined as an unsigned
long.
> printk (written_value);
> }
>
> // READ_MASK_IOCTL
> simask_read_ioctl() {
> cli(); // Not really needed..
> read_value = *(volatile unsigned int *)(IMMR + simask_offset);
> sti();
> printk (read_value);
> }
>
>
<snip>
HTH,
R. Scop
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