rtc: ds1685: add indirect access method and remove plat_read/plat_write

SGI Octane (IP30) doesn't have RTC register directly mapped into CPU
address space, but accesses RTC registers with an address and data
register. This is now supported by additional access functions, which
are selected by a new field in platform data. Removed plat_read/plat_write
since there is no user and their usage could introduce lifetime issue,
when functions are placed in different modules.

Signed-off-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
Acked-by: Joshua Kinard <kumba@gentoo.org>
Reviewed-by: Joshua Kinard <kumba@gentoo.org>
Link: https://lore.kernel.org/r/20191014214621.25257-1-tbogendoerfer@suse.de
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

MIPS: IP32: Fix build errors in reset code in DS1685 platform hook.

Fix two build errors in reset code introduced in DS1685 platform hook patch.

Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Fixes: 15beb694c661: "mips: ip32: add platform data hooks to use DS1685 driver"
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: LKML <linux-kernel@vger.kernel.org>
Cc: rtc-linux@googlegroups.com
Cc: Linux MIPS List <linux-mips@linux-mips.org>
Patchwork: https://patchwork.linux-mips.org/patch/9787/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

mips: ip32: add platform data hooks to use DS1685 driver

This modifies the IP32 (SGI O2) platform and reset code to utilize the new
rtc-ds1685 driver. The old mc146818rtc.h header is removed and ip32_defconfig
is updated as well.

Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MIPS: IP32: ip32-platform is not a module.

So let's remove everything that only makes sense for kernel modules.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

MIPS: IP32: Add platform device for CMOS RTC; remove dead code

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] IP32: Use common SGI button driver

Use the Indy/O2 button driver.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] IP32: Add platform devices for audio and volume button

Create platform devices for audio and volume button driver.

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] Fix IP32 breakage

- suppress master aborts during config read
- set io_map_base
- only fixup end of iomem resource to avoid failing request_resource
in serial driver
- killed useless setting of crime_int bit, which caused wrong interrupts
- use physcial address for serial port platform device and let 8250
driver do the ioremap

Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] IP32: Fix address of 2nd serial interface.

Found by Giuseppe Sacco <giuseppe@eppesuigoccas.homedns.org>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] IP32: Fix initialization of UART base addresses.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] IP32: Fix initialization of UART base addresses.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

[MIPS] Put an end to <asm/serial.h>'s long and annyoing existence

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

meth driver renovation

The meth ethernet driver for the SGI IP32 aka O2 is so far still an old
style driver which does not use the device driver model. This is now
causing issues with some udev based gadgetry in debian-stable. Fixed by
converting the meth driver to a platform device.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

--
Fixes since previous patch:

o Fixed typo in meth_exit_module()
Signed-off-by: Jeff Garzik <jeff@garzik.org>