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powerpc/mpic: Add in-core support for cascaded MPICs

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The Cell and PowerMac platforms use virtually identical cascaded-IRQ
setup code, so just merge it into the core.  Ideally this code would
trigger automatically when an MPIC device-node specifies an "interrupts"
property, perhaps even enabling MPIC_SECONDARY along the way.

Unfortunately, Benjamin Herrenschmidt has had bad experiences in the
past with the quality of Apple PowerMac device-trees, so to be safe we
will only try to parse out an IRQ if the MPIC_SECONDARY flag is set by
the caller.

Signed-off-by: Kyle Moffett <Kyle.D.Moffett@boeing.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Kyle Moffett
2011-12-02 06:28:07 +00:00
committed by Benjamin Herrenschmidt
parent c51242e708
commit 09dc34a95b
3 changed files with 33 additions and 56 deletions
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36
arch/powerpc/platforms/powermac/pic.c
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@@ -464,18 +464,6 @@ int of_irq_map_oldworld(struct device_node *device, int index,
}
#endif /* CONFIG_PPC32 */
static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct mpic *mpic = irq_desc_get_handler_data(desc);
unsigned int cascade_irq = mpic_get_one_irq(mpic);
if (cascade_irq != NO_IRQ)
generic_handle_irq(cascade_irq);
chip->irq_eoi(&desc->irq_data);
}
static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic)
{
#if defined(CONFIG_XMON) && defined(CONFIG_PPC32)
@@ -526,7 +514,6 @@ static int __init pmac_pic_probe_mpic(void)
{
struct mpic *mpic1, *mpic2;
struct device_node *np, *master = NULL, *slave = NULL;
unsigned int cascade;
/* We can have up to 2 MPICs cascaded */
for (np = NULL; (np = of_find_node_by_type(np, "open-pic"))
@@ -562,27 +549,14 @@ static int __init pmac_pic_probe_mpic(void)
of_node_put(master);
/* No slave, let's go out */
if (slave == NULL)
return 0;
/* Get/Map slave interrupt */
cascade = irq_of_parse_and_map(slave, 0);
if (cascade == NO_IRQ) {
printk(KERN_ERR "Failed to map cascade IRQ\n");
return 0;
}
mpic2 = pmac_setup_one_mpic(slave, 0);
if (mpic2 == NULL) {
printk(KERN_ERR "Failed to setup slave MPIC\n");
/* Set up a cascaded controller, if present */
if (slave) {
mpic2 = pmac_setup_one_mpic(slave, 0);
if (mpic2 == NULL)
printk(KERN_ERR "Failed to setup slave MPIC\n");
of_node_put(slave);
return 0;
}
irq_set_handler_data(cascade, mpic2);
irq_set_chained_handler(cascade, pmac_u3_cascade);
of_node_put(slave);
return 0;
}