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authorMichael Ellerman <michael@ellerman.id.au>2007-05-07 22:58:34 -0400
committerPaul Mackerras <paulus@samba.org>2007-05-07 23:40:31 -0400
commitdf87ef5508b40fc655b6c4771be31741d8ec1596 (patch)
treedf6062876a6abc11bdb5accf47f1d51f01a2ed11 /arch/powerpc/kernel/msi.c
parentf728b5c3a599d0410a079f447f921a10be7d59d6 (diff)
[POWERPC] PowerPC MSI infrastructure
This provides the architecture specific hooks to support MSI on powerpc. We implement the newly added arch_setup_msi_irqs() and arch_teardown_msi_irqs(), and then delegate to ppc_md routines. Platforms that don't implement MSI will leave the ppc_md calls blank, arch_msi_check_device() will detect this and return ENOSYS. Drivers should detect this error and continue to use LSI. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel/msi.c')
-rw-r--r--arch/powerpc/kernel/msi.c38
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c
new file mode 100644
index 000000000000..c62d1012c013
--- /dev/null
+++ b/arch/powerpc/kernel/msi.c
@@ -0,0 +1,38 @@
1/*
2 * Copyright 2006-2007, Michael Ellerman, IBM Corporation.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 */
9
10#include <linux/kernel.h>
11#include <linux/msi.h>
12
13#include <asm/machdep.h>
14
15int arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
16{
17 if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
18 pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
19 return -ENOSYS;
20 }
21
22 if (ppc_md.msi_check_device) {
23 pr_debug("msi: Using platform check routine.\n");
24 return ppc_md.msi_check_device(dev, nvec, type);
25 }
26
27 return 0;
28}
29
30int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
31{
32 return ppc_md.setup_msi_irqs(dev, nvec, type);
33}
34
35void arch_teardown_msi_irqs(struct pci_dev *dev)
36{
37 return ppc_md.teardown_msi_irqs(dev);
38}