diff options
| author |  Michael Ellerman <michael@ellerman.id.au>
| 2007-05-08 12:58:36 +1000 |
|---|---|---|
| committer |  Paul Mackerras <paulus@samba.org>
| 2007-05-08 13:43:48 +1000 |
| commit | a7de7c74227edda719b257eb15aecd73790ff894 (patch) | |
| tree | c5168a047e3b55b220a869c678a9fefb76ffbdfc /arch/powerpc/sysdev/mpic.h | |
| parent | [POWERPC] Enable MSI mappings for MPIC (diff) | |
| download | linux-a7de7c74227edda719b257eb15aecd73790ff894.tar.gz linux-a7de7c74227edda719b257eb15aecd73790ff894.tar.bz2 linux-a7de7c74227edda719b257eb15aecd73790ff894.zip | |
[POWERPC] MPIC MSI allocator
To support MSI on MPIC we need a way to reserve and allocate hardware irq
numbers, this patch implements an allocator for that purpose.
New firmware platforms must define a "msi-available-ranges" property on their
MPIC node for MSI to work. For U3/U4 we do a best-guess setup.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/sysdev/mpic.h')
| -rw-r--r-- | arch/powerpc/sysdev/mpic.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpic.h b/arch/powerpc/sysdev/mpic.h new file mode 100644 index 000000000000..87cb2aea2fb4 --- /dev/null +++ b/arch/powerpc/sysdev/mpic.h @@ -0,0 +1,27 @@ +#ifndef _POWERPC_SYSDEV_MPIC_H +#define _POWERPC_SYSDEV_MPIC_H + +/* + * Copyright 2006-2007, Michael Ellerman, IBM Corporation. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; version 2 of the + * License. + * + */ + +#ifdef CONFIG_PCI_MSI +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); +#else +static inline void mpic_msi_reserve_hwirq(struct mpic *mpic, + irq_hw_number_t hwirq) +{ + return; +} +#endif + +#endif /* _POWERPC_SYSDEV_MPIC_H */ |