[linuxsh-dev] PCMCIA driver for SH3 PCC module (partial)

[Jesper S. <js...@re...>]

Greetings people,

I've written a (partial) driver for the PCC PCMCIA module in some of
the SH3 CPUs (I have a SH7707 board).

Unfortunately, I cannot submit a patch that can be easily
integrated. This is mostly because it is not completed and is rather
hackish in some parts - and I will not be completing the driver (it
works well enough for me at this time).

Below are three sets of patches:

 o pcmcia.diff - this one contains the driver and its header file. At
   the top comment is a list of stuff that needs to be done to
   complete the driver.

 o asm.diff - interrupt hack definitions.

 o kernel.diff - this one contains a hack, remapping interrupts from
   the card to vector 11 (comes in at vector 62). If you have a board
   which uses another irq demux function, you'll have to integrate
   them. This interrupt stuff is the single biggest hack of the code;
   the PCMCIA driver layer expects interrupts to be in the range 0-15,
   and that just doesn't jive well with the PCC modules interrupts at
   vectors 62 and 63.

Please note that the driver is written for use with cs-pcmcia-3.19. I
simply copied the files from there into my kernel directory and it
works just fine.


You'll also need to remap the PCI driver's access to the PCMCIA IO
region using something like this:

--------------------------------------------------------------------

#define _P2SEGADDR(a)	((__typeof__(a))(((unsigned long)(a) & 0x1fffffff) | 0xb8000000))

void * _ioremap(unsigned long offset, unsigned long size)
{
#if 0
	return (void *) P2SEGADDR(offset);
#else
	/* FIXME:jskov Bad hack, redeirecting PCI access to the right region */
	if (offset < 0x10000)
		return (void *) _P2SEGADDR(offset);
	else
		return (void *) P2SEGADDR(offset);
#endif
}

void * _ioremap_nocache (unsigned long offset, unsigned long size)
{
#if 0
	return (void *) P2SEGADDR(offset);
#else
	/* FIXME:jskov Bad hack, redeirecting PCI access to the right region */
	if (offset < 0x10000)
		return (void *) _P2SEGADDR(offset);
	else
		return (void *) P2SEGADDR(offset);
#endif
}
--------------------------------------------------------------------

Finally, you need to add the necessary configury.


Even though the driver is not 100% complete, it still works well
enough for me to use an ethernet card in slot 0. I hope someone else
will find it useful.

Obviously, I'd be interested if anyone finds (or fixes) problems with
the driver.

Thanks,
Jesper