From 38958dd9113c19cd7a927009ae585bd5aba3295e Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Wed, 12 Dec 2007 17:44:46 +1100 Subject: [POWERPC] pasemi: Implement MSI support Implement MSI support for PA Semi PWRficient platforms. MSI is done through a special range of sources on the openpic controller, and they're unfortunately breaking the usual concepts of how sources are programmed: * The source is calculated as 512 + the value written into the MSI register * The vector for this source is added to the source and reported through IACK This means that for simplicity, it makes much more sense to just set the vector to 0 for the source, since that's really the vector we expect to see from IACK. Also, the affinity/priority registers will affect 16 sources at a time. To avoid most (simple) users from being limited by this, allocate 16 sources per device but use only one. This means that there's a total of 32 sources. If we get usage scenarions that need more sources, the allocator should probably be revised to take an alignment argument and size, not just do natural alignment. Finally, since I'm already touching the MPIC names on pasemi, rename the base one from the somewhat odd " PAS-OPIC " to "PASEMI-OPIC". Signed-off-by: Olof Johansson Acked-by: Michael Ellerman Signed-off-by: Paul Mackerras --- arch/powerpc/sysdev/mpic.h | 7 +++++++ 1 file changed, 7 insertions(+) (limited to 'arch/powerpc/sysdev/mpic.h') diff --git a/arch/powerpc/sysdev/mpic.h b/arch/powerpc/sysdev/mpic.h index 1cb6bd841027..4783c6e9f30d 100644 --- a/arch/powerpc/sysdev/mpic.h +++ b/arch/powerpc/sysdev/mpic.h @@ -17,6 +17,7 @@ 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); +extern int mpic_pasemi_msi_init(struct mpic *mpic); #else static inline void mpic_msi_reserve_hwirq(struct mpic *mpic, irq_hw_number_t hwirq) @@ -28,9 +29,15 @@ static inline int mpic_u3msi_init(struct mpic *mpic) { return -1; } + +static inline int mpic_pasemi_msi_init(struct mpic *mpic) +{ + return -1; +} #endif extern int mpic_set_irq_type(unsigned int virq, unsigned int flow_type); +extern void mpic_set_vector(unsigned int virq, unsigned int vector); extern void mpic_end_irq(unsigned int irq); extern void mpic_mask_irq(unsigned int irq); extern void mpic_unmask_irq(unsigned int irq); -- cgit v1.2.3