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watchdog: sp5100_tco: Enable watchdog on Family 17h devices if disabled

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On Family 17h (Ryzen) devices, the WatchdogTmrEn bit of PmDecodeEn not only
enables watchdog memory decoding at 0xfeb00000, it also enables the
watchdog hardware itself. Use this information to enable the watchdog if
it is not already enabled.

Cc: Jan Kiszka <jan.kiszka@siemens.com>
Tested-by: Jan Kiszka <jan.kiszka@siemens.com>
Link: https://lore.kernel.org/r/20200910163109.235136-2-linux@roeck-us.net
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
This commit is contained in:
Guenter Roeck 2020-09-10 09:31:09 -07:00 committed by Wim Van Sebroeck
parent 08c619b492
commit 09da89abe3
1 changed files with 18 additions and 0 deletions
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18
drivers/watchdog/sp5100_tco.c
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@ -17,6 +17,12 @@
* AMD Publication 51192 "AMD Bolton FCH Register Reference Guide"
* AMD Publication 52740 "BIOS and Kernel Developer’s Guide (BKDG)
* for AMD Family 16h Models 30h-3Fh Processors"
* AMD Publication 55570-B1-PUB "Processor Programming Reference (PPR)
* for AMD Family 17h Model 18h, Revision B1
* Processors (PUB)
* AMD Publication 55772-A1-PUB "Processor Programming Reference (PPR)
* for AMD Family 17h Model 20h, Revision A1
* Processors (PUB)
*/
/*
@ -241,6 +247,18 @@ static int sp5100_tco_setupdevice(struct device *dev,
break;
case efch:
dev_name = SB800_DEVNAME;
/*
* On Family 17h devices, the EFCH_PM_DECODEEN_WDT_TMREN bit of
* EFCH_PM_DECODEEN not only enables the EFCH_PM_WDT_ADDR memory
* region, it also enables the watchdog itself.
*/
if (boot_cpu_data.x86 == 0x17) {
val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN);
if (!(val & EFCH_PM_DECODEEN_WDT_TMREN)) {
sp5100_tco_update_pm_reg8(EFCH_PM_DECODEEN, 0xff,
EFCH_PM_DECODEEN_WDT_TMREN);
}
}
val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN);
if (val & EFCH_PM_DECODEEN_WDT_TMREN)
mmio_addr = EFCH_PM_WDT_ADDR;