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powerpc/pasemi: Add Nemo board IRQ initroutine

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Add a IRQ init routine for the Nemo board which inits and attatches
the i8259 found in the SB600, and a cascade routine to dispatch the
interrupts.

Signed-off-by: Darren Stevens <darren@stevens-zone.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Darren Stevens 2018-08-19 21:21:47 +01:00 committed by Michael Ellerman
parent 68f211a4d1
commit 0428a5f494
1 changed files with 37 additions and 0 deletions
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37
arch/powerpc/platforms/pasemi/setup.c
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@ -34,6 +34,7 @@
#include <asm/prom.h>
#include <asm/iommu.h>
#include <asm/machdep.h>
#include <asm/i8259.h>
#include <asm/mpic.h>
#include <asm/smp.h>
#include <asm/time.h>
@ -183,6 +184,42 @@ static int __init pas_setup_mce_regs(void)
}
machine_device_initcall(pasemi, pas_setup_mce_regs);
#ifdef CONFIG_PPC_PASEMI_NEMO
static void sb600_8259_cascade(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
unsigned int cascade_irq = i8259_irq();
if (cascade_irq)
generic_handle_irq(cascade_irq);
chip->irq_eoi(&desc->irq_data);
}
static void nemo_init_IRQ(struct mpic *mpic)
{
struct device_node *np;
int gpio_virq;
/* Connect the SB600's legacy i8259 controller */
np = of_find_node_by_path("/pxp@0,e0000000");
i8259_init(np, 0);
of_node_put(np);
gpio_virq = irq_create_mapping(NULL, 3);
irq_set_irq_type(gpio_virq, IRQ_TYPE_LEVEL_HIGH);
irq_set_chained_handler(gpio_virq, sb600_8259_cascade);
mpic_unmask_irq(irq_get_irq_data(gpio_virq));
irq_set_default_host(mpic->irqhost);
}
#else
static inline void nemo_init_IRQ(struct mpic *mpic)
{
}
#endif
static __init void pas_init_IRQ(void)
{
struct device_node *np;