lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[POWERPC] MPIC U3/U4 MSI backend

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files

12
arch/powerpc/sysdev/mpic.c
View File

@ -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 */