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authorMichael Ellerman <michael@ellerman.id.au>2007-05-08 12:58:36 +1000
committerPaul Mackerras <paulus@samba.org>2007-05-08 13:43:48 +1000
commita7de7c74227edda719b257eb15aecd73790ff894 (patch)
treec5168a047e3b55b220a869c678a9fefb76ffbdfc /arch/powerpc/sysdev/mpic.h
parent812fd1fd63caf2d72906603ebb9c6049a19ef4d2 (diff)
[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.h27
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 00000000000..87cb2aea2fb
--- /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 */