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

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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23
arch/powerpc/platforms/cell/setup.c
View File

@ -184,24 +184,10 @@ static int __init cell_publish_devices(void)
}
machine_subsys_initcall(cell, cell_publish_devices);
static void cell_mpic_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 virq;
virq = mpic_get_one_irq(mpic);
if (virq != NO_IRQ)
generic_handle_irq(virq);
chip->irq_eoi(&desc->irq_data);
}
static void __init mpic_init_IRQ(void)
{
struct device_node *dn;
struct mpic *mpic;
unsigned int virq;
for (dn = NULL;
(dn = of_find_node_by_name(dn, "interrupt-controller"));) {
@ -215,15 +201,6 @@ static void __init mpic_init_IRQ(void)
if (mpic == NULL)
continue;
mpic_init(mpic);
virq = irq_of_parse_and_map(dn, 0);
if (virq == NO_IRQ)
continue;
printk(KERN_INFO "%s : hooking up to IRQ %d\n",
dn->full_name, virq);
irq_set_handler_data(virq, mpic);
irq_set_chained_handler(virq, cell_mpic_cascade);
}
}

36
arch/powerpc/platforms/powermac/pic.c
View File

@ -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;
}

30
arch/powerpc/sysdev/mpic.c
View File

@ -1111,6 +1111,22 @@ static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
return 0;
}
/* IRQ handler for a secondary MPIC cascaded from another IRQ controller */
static void mpic_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 virq;
BUG_ON(!(mpic->flags & MPIC_SECONDARY));
virq = mpic_get_one_irq(mpic);
if (virq != NO_IRQ)
generic_handle_irq(virq);
chip->irq_eoi(&desc->irq_data);
}
static struct irq_host_ops mpic_host_ops = {
.match = mpic_host_match,
.map = mpic_host_map,
@ -1402,8 +1418,7 @@ void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
void __init mpic_init(struct mpic *mpic)
{
int i;
int cpu;
int i, cpu;
BUG_ON(mpic->num_sources == 0);
@ -1488,6 +1503,17 @@ void __init mpic_init(struct mpic *mpic)
GFP_KERNEL);
BUG_ON(mpic->save_data == NULL);
#endif
/* Check if this MPIC is chained from a parent interrupt controller */
if (mpic->flags & MPIC_SECONDARY) {
int virq = irq_of_parse_and_map(mpic->node, 0);
if (virq != NO_IRQ) {
printk(KERN_INFO "%s: hooking up to IRQ %d\n",
mpic->node->full_name, virq);
irq_set_handler_data(virq, mpic);
irq_set_chained_handler(virq, &mpic_cascade);
}
}
}
void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)