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[POWERPC] pasemi: Implement NMI support

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Some PWRficient-based boards have a NMI button that's wired up to a GPIO
as interrupt source. By configuring the openpic accordingly, these get
delivered as a machine check with high priority, instead of as an external
interrupt.

The device tree contains a property "nmi-source" in the openpic node
for these systems, and it's the (hwirq) source for the input.

Also, for these interrupts, the IACK is read from another register than
the regular (MCACK instead), but they are EOI'd as usual. So implement
said function for the mpic driver.

Finally, move a couple of external function defines to include/ instead
of local under sysdev. Being able to mask/unmask and eoi directly saves
us from setting up a dummy irq handler that will never be called.

Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson 2007-12-20 13:11:18 -06:00
parent c2a7dcad9f
commit f365355e65
4 changed files with 66 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

26
arch/powerpc/sysdev/mpic.c
View file

@ -83,6 +83,7 @@ static u32 mpic_infos[][MPIC_IDX_END] = {
MPIC_CPU_WHOAMI,
MPIC_CPU_INTACK,
MPIC_CPU_EOI,
MPIC_CPU_MCACK,
MPIC_IRQ_BASE,
MPIC_IRQ_STRIDE,
@ -121,6 +122,7 @@ static u32 mpic_infos[][MPIC_IDX_END] = {
TSI108_CPU_WHOAMI,
TSI108_CPU_INTACK,
TSI108_CPU_EOI,
TSI108_CPU_MCACK,
TSI108_IRQ_BASE,
TSI108_IRQ_STRIDE,
@ -1126,6 +1128,11 @@ struct mpic * __init mpic_alloc(struct device_node *node,
mb();
}
if (flags & MPIC_ENABLE_MCK)
mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
| MPIC_GREG_GCONF_MCK);
/* Read feature register, calculate num CPUs and, for non-ISU
* MPICs, num sources as well. On ISU MPICs, sources are counted
* as ISUs are added
@ -1438,13 +1445,13 @@ void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
}
unsigned int mpic_get_one_irq(struct mpic *mpic)
static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
{
u32 src;
src = mpic_cpu_read(MPIC_INFO(CPU_INTACK)) & MPIC_INFO(VECPRI_VECTOR_MASK);
src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
#ifdef DEBUG_LOW
DBG("%s: get_one_irq(): %d\n", mpic->name, src);
DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
#endif
if (unlikely(src == mpic->spurious_vec)) {
if (mpic->flags & MPIC_SPV_EOI)
@ -1462,6 +1469,11 @@ unsigned int mpic_get_one_irq(struct mpic *mpic)
return irq_linear_revmap(mpic->irqhost, src);
}
unsigned int mpic_get_one_irq(struct mpic *mpic)
{
return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
}
unsigned int mpic_get_irq(void)
{
struct mpic *mpic = mpic_primary;
@ -1471,6 +1483,14 @@ unsigned int mpic_get_irq(void)
return mpic_get_one_irq(mpic);
}
unsigned int mpic_get_mcirq(void)
{
struct mpic *mpic = mpic_primary;
BUG_ON(mpic == NULL);
return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
}
#ifdef CONFIG_SMP
void mpic_request_ipis(void)