Date: Wed, 17 Nov 2004 22:01:38 -0800 From: Nate Lawson <nate@root.org> To: Warner Losh <imp@rover.village.org> Cc: freebsd-current@FreeBSD.org Subject: Re: [PATCH] Please test: new ACPI release (20041105) import Message-ID: <419C3AC2.5010505@root.org> In-Reply-To: <20041117.204804.71148446.imp@harmony.village.org> References: <419C00A7.7030300@root.org> <20041117.202521.74694027.imp@harmony.village.org> <419C1A7A.6050000@root.org> <20041117.204804.71148446.imp@harmony.village.org>
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Warner Losh wrote:
>>My serial port. It's named UART in the AML, that's all. Setting it to
>>D3 hangs the system.
>
> Is it a PCI device too? If not, then maybe you need to disable
> interrupts in the UART before setting the power state. Chances are
> its interrupt cause register is returning 0xff, which hangs sio, since
> it never breaks out of the loop when this happens.
It is not, it's a legacy device:
sio0 pnpinfo _HID=PNP0501 _UID=0 at handle=\_SB_.PCI0.LPC_.UART
The power methods for it are:
Method (_PS0, 0, NotSerialized)
{
Store (0x03, LDN)
Store (0x01, LDA)
Store (0x01, SSBY)
}
Method (_PS3, 0, NotSerialized)
{
Store (0x03, LDN)
Store (0x00, LDA)
Store (0x00, SSBY)
}
The regions accessed by these Store ops are as follows, and all appear
to be mapped to the ICH:
OperationRegion (IMGA, SystemIO, 0x15E0, 0x10)
OperationRegion (NCFG, SystemIO, 0x2E, 0x02)
Is there a standard for how to do power transitions for non-PCI devices?
I thought you just call the acpi methods if present.
-Nate
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