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uart: add resume method and enable it for attachments on the most common

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x86 buses

Otherwise the uart hardware could be in such a state after the resume
where IER is cleared and thus no interrupts are generated.

This behavior is observed and tested with QEMU, so I am comitting this
change to help with my debugging.
There has been no feedback from users of serial ports on real hardware.

MFC after:	20 days
This commit is contained in:
Andriy Gapon 2013-02-02 11:38:26 +00:00
parent 13235aaa89
commit 5b23b1b9e7
5 changed files with 13 additions and 0 deletions
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1
sys/dev/uart/uart_bus.h
View File

@ -138,6 +138,7 @@ extern char uart_driver_name[];
int uart_bus_attach(device_t dev);
int uart_bus_detach(device_t dev);
int uart_bus_resume(device_t dev);
serdev_intr_t *uart_bus_ihand(device_t dev, int ipend);
int uart_bus_ipend(device_t dev);
int uart_bus_probe(device_t dev, int regshft, int rclk, int rid, int chan);

1
sys/dev/uart/uart_bus_acpi.c
View File

@ -47,6 +47,7 @@ static device_method_t uart_acpi_methods[] = {
DEVMETHOD(device_probe, uart_acpi_probe),
DEVMETHOD(device_attach, uart_bus_attach),
DEVMETHOD(device_detach, uart_bus_detach),
DEVMETHOD(device_resume, uart_bus_resume),
{ 0, 0 }
};

1
sys/dev/uart/uart_bus_isa.c
View File

@ -50,6 +50,7 @@ static device_method_t uart_isa_methods[] = {
DEVMETHOD(device_probe, uart_isa_probe),
DEVMETHOD(device_attach, uart_bus_attach),
DEVMETHOD(device_detach, uart_bus_detach),
DEVMETHOD(device_resume, uart_bus_resume),
{ 0, 0 }
};

1
sys/dev/uart/uart_bus_pci.c
View File

@ -51,6 +51,7 @@ static device_method_t uart_pci_methods[] = {
DEVMETHOD(device_probe, uart_pci_probe),
DEVMETHOD(device_attach, uart_bus_attach),
DEVMETHOD(device_detach, uart_bus_detach),
DEVMETHOD(device_resume, uart_bus_resume),
{ 0, 0 }
};

9
sys/dev/uart/uart_core.c
View File

@ -590,3 +590,12 @@ uart_bus_detach(device_t dev)
return (0);
}
int
uart_bus_resume(device_t dev)
{
struct uart_softc *sc;
sc = device_get_softc(dev);
return (UART_ATTACH(sc));
}