CS4202
4.26
D15
E15
BIOS-Driver Interface Control Registers (Index 70h - 72h)
D14
E14
D13
E13
D12
E12
D11
E11
D10
E10
D9
E9
D8
E8
D7
E7
D6
E6
D5
E5
D4
E4
D3
E3
D2
E2
D1
E1
D0
E0
E[15:0]
Default
Event Configuration. The E[15:0] bits control the BIOS-Driver Interface mechanism.
0000h
The
BDI Config Register (Index 70h)
enables BIOS-Driver communication for each possible event. If a bit is ‘0’, the
corresponding event will not be communicated. If a bit is ‘1’, the corresponding event will be communicated by as-
serting the BDI bit in input slot 12. If an event occurs, the BIOS will ‘set’ the corresponding bit in the
BDI Status Reg-
ister (Index 7Ah).
This bit remains ‘set’ until it is cleared by the driver, acknowledging the event has been handled.
This behavior is equivalent to “non-sticky” (level sensitive) GPIO input pins.
The
BDI Wakeup Register (Index 72h)
provides a mask for determining if a BDI event will generate a wakeup or
GPIO_INT. If a bit is ‘0’, the corresponding event will not generate an interrupt. If a bit is ‘1’, the corresponding event
will generate an interrupt. Refer to the
for details about wakeup inter-
rupts.
4.27
D15
E15
BIOS-Driver Interface Status Register (Index 7Ah)
D14
E14
D13
E13
D12
E12
D11
E11
D10
E10
D9
E9
D8
E8
D7
E7
D6
E6
D5
E5
D4
E4
D3
E3
D2
E2
D1
E1
D0
E0
E[15:0]
Default
Event Status. This register, in conjunction with the
controls the BIOS-Driver Interface mechanism.
0000h
The
BDI Status Register (Index 7Ah)
reflects the state of all possible events. If a bit is ‘0’, the corresponding event
has not occurred or has already been handled by the driver. If a bit is ‘1’, the corresponding event has occurred and
has not been handled by the driver yet. The BDI bit in input slot 12 is a logic OR of all bits in this register ANDed
with their corresponding bit in the
BDI Config Register (Index 70h).
After handling an event, the driver should clear
it by writing a ‘0’ to the corresponding bit of this register.
40
DS549PP2
CIRRUS [ CIRRUS LOGIC ]
