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powerpc: Fix programmer's switch driver and add to GENERIC

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Older G4 and G3 models have a programmer's switch that can be used to
generate an interrupt to drop into the debugger.

This code hadn't been tested for a long time. It had been broken back
in 2005 in r153050.

Repair and modernize the code and add it to GENERIC.

Reviewed by:	jhibbits (approved w/ removal of unused sc_dev var)
Sponsored by:	Tag1 Consulting, Inc.
Differential Revision:	https://reviews.freebsd.org/D29131
This commit is contained in:
Brandon Bergren 2021-04-05 12:04:12 -05:00
parent f30f11f878
commit 0c9f52d4ce
2 changed files with 14 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sys/powerpc/conf/GENERIC
View File

@ -215,6 +215,7 @@ device smu # Apple System Management Unit
device adm1030 # Apple G4 MDD fan controller
device atibl # ATI-based backlight driver for PowerBooks/iBooks
device nvbl # nVidia-based backlight driver for PowerBooks/iBooks
device pswitch # Macio programmer's switch
# ADB support
device adb

46
sys/powerpc/powermac/pswitch.c
View File

@ -41,14 +41,15 @@
#include <machine/resource.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/openfirm.h>
#include <powerpc/powermac/maciovar.h>
struct pswitch_softc {
int sc_irqrid;
struct resource *sc_irq;
void *sc_ih;
int sc_irq_rid;
struct resource *sc_irq;
void *sc_ih;
};
static int pswitch_probe(device_t);
@ -71,14 +72,15 @@ static driver_t pswitch_driver = {
static devclass_t pswitch_devclass;
DRIVER_MODULE(pswitch, macio, pswitch_driver, pswitch_devclass, 0, 0);
EARLY_DRIVER_MODULE(pswitch, macgpio, pswitch_driver, pswitch_devclass,
0, 0, BUS_PASS_RESOURCE);
static int
pswitch_probe(device_t dev)
{
char *type = macio_get_devtype(dev);
const char *type = ofw_bus_get_type(dev);
if (strcmp(type, "gpio") != 0)
if (strcmp(type, "programmer-switch") != 0)
return (ENXIO);
device_set_desc(dev, "GPIO Programmer's Switch");
@ -89,43 +91,21 @@ static int
pswitch_attach(device_t dev)
{
struct pswitch_softc *sc;
phandle_t node, child;
char type[32];
u_int irq[2];
sc = device_get_softc(dev);
node = macio_get_node(dev);
for (child = OF_child(node); child != 0; child = OF_peer(child)) {
if (OF_getprop(child, "device_type", type, 32) == -1)
continue;
if (strcmp(type, "programmer-switch") == 0)
break;
}
if (child == 0) {
device_printf(dev, "could not find correct node\n");
return (ENXIO);
}
if (OF_getprop(child, "interrupts", irq, sizeof(irq)) == -1) {
device_printf(dev, "could not get interrupt\n");
return (ENXIO);
}
sc->sc_irqrid = 0;
sc->sc_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->sc_irqrid,
irq[0], irq[0], 1, RF_ACTIVE);
sc->sc_irq_rid = 0;
sc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
&sc->sc_irq_rid, RF_ACTIVE);
if (sc->sc_irq == NULL) {
device_printf(dev, "could not allocate interrupt\n");
return (ENXIO);
}
if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC,
if (bus_setup_intr(dev, sc->sc_irq, INTR_TYPE_MISC | INTR_EXCL,
pswitch_intr, NULL, dev, &sc->sc_ih) != 0) {
device_printf(dev, "could not setup interrupt\n");
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irqrid,
bus_release_resource(dev, SYS_RES_IRQ, sc->sc_irq_rid,
sc->sc_irq);
return (ENXIO);
}