[POWERPC] 85xxCDS: Delay 8259 cascade hookup.
The interrupts of an E100 card inserted in PCI slot 4 may be on at bootup.
The resulting interrupt flood interacts with the 8259 cascade handler and
prevents proper boot up. There is a quirk for the E100 that will disable
the E100's interrupts but to use it, the 8259 cascade hookup must be
delayed until after the quirk has run. This patch delays the 8259 cascade
hookup by registering a device_initcall() which runs after the PCI quirk
for the E100.
Signed-off-by: Randy Vinson <rvinson@mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/85xx/mpc85xx_cds.c b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
index e77c869..2a41083 100644
--- a/arch/powerpc/platforms/85xx/mpc85xx_cds.c
+++ b/arch/powerpc/platforms/85xx/mpc85xx_cds.c
@@ -183,10 +183,6 @@
struct mpic *mpic;
struct resource r;
struct device_node *np = NULL;
-#if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
- struct device_node *cascade_node = NULL;
- int cascade_irq;
-#endif
np = of_find_node_by_type(np, "open-pic");
@@ -210,8 +206,19 @@
of_node_put(np);
mpic_init(mpic);
+}
#if defined(CONFIG_PPC_I8259) && defined(CONFIG_PCI)
+static int mpc85xx_cds_8259_attach(void)
+{
+ int ret;
+ struct device_node *np = NULL;
+ struct device_node *cascade_node = NULL;
+ int cascade_irq;
+
+ if (!machine_is(mpc85xx_cds))
+ return 0;
+
/* Initialize the i8259 controller */
for_each_node_by_type(np, "interrupt-controller")
if (of_device_is_compatible(np, "chrp,iic")) {
@@ -221,13 +228,13 @@
if (cascade_node == NULL) {
printk(KERN_DEBUG "Could not find i8259 PIC\n");
- return;
+ return -ENODEV;
}
cascade_irq = irq_of_parse_and_map(cascade_node, 0);
if (cascade_irq == NO_IRQ) {
printk(KERN_ERR "Failed to map cascade interrupt\n");
- return;
+ return -ENXIO;
}
i8259_init(cascade_node, 0);
@@ -239,14 +246,21 @@
* disabled when the last user of the shared IRQ line frees their
* interrupt.
*/
- if (setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))
+ if ((ret = setup_irq(cascade_irq, &mpc85xxcds_8259_irqaction))) {
printk(KERN_ERR "Failed to setup cascade interrupt\n");
- else
- /* Success. Connect our low-level cascade handler. */
- set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
-#endif /* CONFIG_PPC_I8259 */
+ return ret;
+ }
+
+ /* Success. Connect our low-level cascade handler. */
+ set_irq_handler(cascade_irq, mpc85xx_8259_cascade_handler);
+
+ return 0;
}
+device_initcall(mpc85xx_cds_8259_attach);
+
+#endif /* CONFIG_PPC_I8259 */
+
/*
* Setup the architecture
*/