On 10.09.20 18:55, Jan Kiszka wrote:
> On 10.09.20 18:53, Guenter Roeck wrote:
>> Hi Jan,
>>
>> On 9/10/20 9:34 AM, Jan Kiszka wrote:
>>> On 10.09.20 18:31, Guenter Roeck wrote:
>>>> 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@xxxxxxxxxxx>
>>>> Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
>>>> ---
>>>> drivers/watchdog/sp5100_tco.c | 18 ++++++++++++++++++
>>>> 1 file changed, 18 insertions(+)
>>>>
>>>> diff --git a/drivers/watchdog/sp5100_tco.c b/drivers/watchdog/sp5100_tco.c
>>>> index 85e9664318c9..a730ecbf78cd 100644
>>>> --- a/drivers/watchdog/sp5100_tco.c
>>>> +++ b/drivers/watchdog/sp5100_tco.c
>>>> @@ -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;
>>>>
>>>
>>> Won't that bring us EFCH_PM_WDT_ADDR as address, rather than
>>> EFCH_PM_ACPI_MMIO_ADDR which worked in my case? Or is one an alias of
>>> the other.
>>>
>>
>> Yes, it does use EFCH_PM_WDT_ADDR. EFCH_PM_ACPI_MMIO_ADDR works as well,
>> but is meant to be a fallback. Both point to the watchdog memory space.
>>
>
> OK, will test, possibly only on the weekend, and confirm this also on my
> board.
>
> Jan
>
Both patches now
Tested-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Thanks,
Jan
--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
