diff options
Diffstat (limited to 'sys/dev/atkbdc/atkbdc_isa.c')
| -rw-r--r-- | sys/dev/atkbdc/atkbdc_isa.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/sys/dev/atkbdc/atkbdc_isa.c b/sys/dev/atkbdc/atkbdc_isa.c index deeb7a0..96abfb5 100644 --- a/sys/dev/atkbdc/atkbdc_isa.c +++ b/sys/dev/atkbdc/atkbdc_isa.c @@ -93,6 +93,12 @@ atkbdc_isa_probe(device_t dev) u_long count; int error; int rid; +#if defined(__i386__) + bus_space_tag_t tag; + bus_space_handle_t ioh1; + volatile int i; + register_t flags; +#endif /* check PnP IDs */ if (ISA_PNP_PROBE(device_get_parent(dev), dev, atkbdc_ids) == ENXIO) @@ -127,6 +133,31 @@ atkbdc_isa_probe(device_t dev) bus_release_resource(dev, SYS_RES_IOPORT, 0, port0); return ENXIO; } + +#if defined(__i386__) + /* + * Check if we really have AT keyboard controller. Poll status + * register until we get "all clear" indication. If no such + * indication comes, it probably means that there is no AT + * keyboard controller present. Give up in such case. Check relies + * on the fact that reading from non-existing in/out port returns + * 0xff on i386. May or may not be true on other platforms. + */ + tag = rman_get_bustag(port0); + ioh1 = rman_get_bushandle(port1); + flags = intr_disable(); + for (i = 0; i != 65535; i++) { + if ((bus_space_read_1(tag, ioh1, 0) & 0x2) == 0) + break; + } + intr_restore(flags); + if (i == 65535) { + bus_release_resource(dev, SYS_RES_IOPORT, 0, port0); + bus_release_resource(dev, SYS_RES_IOPORT, 1, port1); + return ENXIO; + } +#endif + device_verbose(dev); error = atkbdc_probe_unit(device_get_unit(dev), port0, port1); |
