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ich9: implement strap SPKR pin logic

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If the signal is sampled high, this indicates that the system is
strapped to the "No Reboot" mode (ICH9 will disable the TCO Timer system
reboot feature). The status of this strap is readable via the NO_REBOOT
bit (CC: offset 0x3410:bit 5).

The NO_REBOOT bit is set when SPKR pin on ICH9 is sampled high. This bit
may be set or cleared by software if the strap is sampled low but may
not override the strap when it indicates "No Reboot".

This patch implements the logic where hardware has ability to set SPKR
pin through a property named "noreboot" and it's sampled high by
default.

Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Paulo Alcantara 2015-06-28 14:58:58 -03:00 • committed by Michael S. Tsirkin
parent 45dcdb9da6
commit 5add35bec1
4 changed files with 28 additions and 3 deletions
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5
include/hw/i386/ich9.h
View file

@ -46,6 +46,11 @@ typedef struct ICH9LPCState {
ICH9LPCPMRegs pm;
uint32_t sci_level; /* track sci level */
/* 2.24 Pin Straps */
struct {
bool spkr_hi;
} pin_strap;
/* 10.1 Chipset Configuration registers(Memory Space)
which is pointed by RCBA */
uint8_t chip_config[ICH9_CC_SIZE];