Watchdog: sp5100_tco: Add initialization using EFCH MMIO

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cd6h/cd7h port I/O can be disabled on recent AMD hardware. Read
accesses to disabled cd6h/cd7h port I/O will return F's and written
data is dropped. It is recommended to replace the cd6h/cd7h
port I/O with MMIO.

Co-developed-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Robert Richter <rrichter@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Tested-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/r/20220202153525.1693378-4-terry.bowman@amd.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>

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Terry Bowman 2022-02-02 09:35:24 -06:00 • committed by Wim Van Sebroeck

parent 1f182aca23

commit 0578fff4aa

2 changed files with 104 additions and 1 deletions

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100

drivers/watchdog/sp5100_tco.c

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5

drivers/watchdog/sp5100_tco.h

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