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On AXi and AXmp boards the NS16550 (used to connect keyboard and mouse)

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share their IRQ lines with the i8042. Any IRQ activity (typically during
attach) on the NS16550 used to connect the keyboard when actually the
PS/2 keyboard is selected in OFW causes interaction with the OBP i8042
driver resulting in a hang (and vice versa). As RS232 keyboards and mice
obviously aren't meant to be used in parallel with PS/2 ones on these
boards don't attach to these NS16550 in case the RS232 keyboard isn't
selected in order to prevent such hangs.

Ok'ed by:	marcel
This commit is contained in:
marius 2005-06-04 21:52:56 +00:00
parent ed7fa679fa
commit d128ff3218
1 changed files with 20 additions and 0 deletions
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20
sys/dev/uart/uart_bus_ebus.c
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@ -38,6 +38,7 @@ __FBSDID("$FreeBSD$");
#include <machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
#include <machine/ver.h>
#include <dev/uart/uart.h>
#include <dev/uart/uart_bus.h>
@ -64,6 +65,7 @@ uart_ebus_probe(device_t dev)
{
const char *nm, *cmpt;
struct uart_softc *sc;
struct uart_devinfo dummy;
int error;
sc = device_get_softc(dev);
@ -73,6 +75,24 @@ uart_ebus_probe(device_t dev)
cmpt = ofw_bus_get_compat(dev);
if (!strcmp(nm, "su") || !strcmp(nm, "su_pnp") || (cmpt != NULL &&
(!strcmp(cmpt, "su") || !strcmp(cmpt, "su16550")))) {
/*
* On AXi and AXmp boards the NS16550 (used to connect
* keyboard/mouse) share their IRQ lines with the i8042.
* Any IRQ activity (typically during attach) of the
* NS16550 used to connect the keyboard when actually the
* PS/2 keyboard is selected in OFW causes interaction
* with the OBP i8042 driver resulting in a hang and vice
* versa. As RS232 keyboards and mice obviously aren't
* meant to be used in parallel with PS/2 ones on these
* boards don't attach to the NS16550 in case the RS232
* keyboard isn't selected in order to prevent such hangs.
*/
if ((!strcmp(sparc64_model, "SUNW,UltraAX-MP") ||
!strcmp(sparc64_model, "SUNW,UltraSPARC-IIi-Engine")) &&
uart_cpu_getdev(UART_DEV_KEYBOARD, &dummy)) {
device_disable(dev);
return (ENXIO);
}
sc->sc_class = &uart_ns8250_class;
return (uart_bus_probe(dev, 0, 0, 0, 0));
}