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| author |   Michael Ellerman <michael@ellerman.id.au> | 2007-05-08 12:58:37 +1000 |
|---|---|---|
| committer |   Paul Mackerras <paulus@samba.org> | 2007-05-08 13:46:48 +1000 |
| commit | 05af7bd2d75e5098021864d83fbb831111755fa0 (patch) | |
| tree | c5319ce0410fdf732679175fa5a4df25cbb0e830 /arch/powerpc/sysdev/mpic.c | |
| parent | [POWERPC] MPIC MSI allocator (diff) | |
| download | linux-dev-05af7bd2d75e5098021864d83fbb831111755fa0.tar.xz linux-dev-05af7bd2d75e5098021864d83fbb831111755fa0.zip | |
[POWERPC] MPIC U3/U4 MSI backend
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>
Diffstat (limited to 'arch/powerpc/sysdev/mpic.c')
| -rw-r--r-- | arch/powerpc/sysdev/mpic.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c index fc0428aea0c0..4fd2bec89916 100644 --- a/arch/powerpc/sysdev/mpic.c +++ b/arch/powerpc/sysdev/mpic.c @@ -618,7 +618,7 @@ static irqreturn_t mpic_ipi_action(int irq, void *dev_id) */ -static void mpic_unmask_irq(unsigned int irq) +void mpic_unmask_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); @@ -638,7 +638,7 @@ static void mpic_unmask_irq(unsigned int irq) } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK); } -static void mpic_mask_irq(unsigned int irq) +void mpic_mask_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); @@ -659,7 +659,7 @@ static void mpic_mask_irq(unsigned int irq) } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK)); } -static void mpic_end_irq(unsigned int irq) +void mpic_end_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); @@ -792,7 +792,7 @@ static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type) } } -static int mpic_set_irq_type(unsigned int virq, unsigned int flow_type) +int mpic_set_irq_type(unsigned int virq, unsigned int flow_type) { struct mpic *mpic = mpic_from_irq(virq); unsigned int src = mpic_irq_to_hw(virq); @@ -1203,8 +1203,10 @@ void __init mpic_init(struct mpic *mpic) /* Do the HT PIC fixups on U3 broken mpic */ DBG("MPIC flags: %x\n", mpic->flags); - if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) + if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) { mpic_scan_ht_pics(mpic); + mpic_u3msi_init(mpic); + } for (i = 0; i < mpic->num_sources; i++) { /* start with vector = source number, and masked */ |