uart: add resume method

[Andriy Gapon]

Guys,

do you think that the following change is useful/needed?

I needed it with UART emulated in qemu, but I have no experience with real 
hardware.

commit ff1cc9b33c34fec4f3d1d3cb675ec3f8cfbc96de
Author: Andriy Gapon <a...@icyb.net.ua>
Date:   Wed Dec 19 23:31:49 2012 +0200

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

diff --git a/sys/dev/uart/uart_bus.h b/sys/dev/uart/uart_bus.h
index 01752d0..322e9a8 100644
--- a/sys/dev/uart/uart_bus.h
+++ b/sys/dev/uart/uart_bus.h
@@ -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);
diff --git a/sys/dev/uart/uart_bus_acpi.c b/sys/dev/uart/uart_bus_acpi.c
index 756f7f2..ccd213d 100644
--- a/sys/dev/uart/uart_bus_acpi.c
+++ b/sys/dev/uart/uart_bus_acpi.c
@@ -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 }
 };

diff --git a/sys/dev/uart/uart_bus_isa.c b/sys/dev/uart/uart_bus_isa.c
index 1836663..1fda15f 100644
--- a/sys/dev/uart/uart_bus_isa.c
+++ b/sys/dev/uart/uart_bus_isa.c
@@ -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 }
 };

diff --git a/sys/dev/uart/uart_bus_pci.c b/sys/dev/uart/uart_bus_pci.c
index 307ee340..4237fa4 100644
--- a/sys/dev/uart/uart_bus_pci.c
+++ b/sys/dev/uart/uart_bus_pci.c
@@ -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 }
 };

diff --git a/sys/dev/uart/uart_core.c b/sys/dev/uart/uart_core.c
index 8234d63..aa0d792 100644
--- a/sys/dev/uart/uart_core.c
+++ b/sys/dev/uart/uart_core.c
@@ -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));
+}

-- 
Andriy Gapon

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