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[POWERPC] MPIC U3/U4 MSI backend

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MPIC U3/U4 MSI backend. Based on code from Segher, heavily hacked by me.
This only deals with MSI on U3/U4 MPICs, aka. CPC 9x5.

If we find a U3/U4 then we enable this backend, ie. take over the ppc_md
MSI hooks. We might need more elaborate logic in future to decide which
backend is enabled.

We need our own irq_chip so that we can do MSI masking/unmasking on
the device itself. We also need to mask explicitly on shutdown to make
sure we don't get bitten by lazy-disable semantics.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman
2007-05-08 12:58:37 +10:00
committed by Paul Mackerras
parent a7de7c7422
commit 05af7bd2d7
4 changed files with 205 additions and 6 deletions
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11
arch/powerpc/sysdev/mpic.h
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@@ -16,12 +16,23 @@ extern void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq);
extern int mpic_msi_init_allocator(struct mpic *mpic);
extern irq_hw_number_t mpic_msi_alloc_hwirqs(struct mpic *mpic, int num);
extern void mpic_msi_free_hwirqs(struct mpic *mpic, int offset, int num);
extern int mpic_u3msi_init(struct mpic *mpic);
#else
static inline void mpic_msi_reserve_hwirq(struct mpic *mpic,
irq_hw_number_t hwirq)
{
return;
}
static inline int mpic_u3msi_init(struct mpic *mpic)
{
return -1;
}
#endif
extern int mpic_set_irq_type(unsigned int virq, unsigned int flow_type);
extern void mpic_end_irq(unsigned int irq);
extern void mpic_mask_irq(unsigned int irq);
extern void mpic_unmask_irq(unsigned int irq);
#endif /* _POWERPC_SYSDEV_MPIC_H */