[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>
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 67668fd..abb13cf 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -682,6 +682,7 @@
&& !PPC_85xx && !PPC_86xx
default PCI_PERMEDIA if !4xx && !CPM2 && !8xx && APUS
default PCI_QSPAN if !4xx && !CPM2 && 8xx
+ select ARCH_SUPPORTS_MSI
help
Find out whether your system includes a PCI bus. PCI is the name of
a bus system, i.e. the way the CPU talks to the other stuff inside
diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile
index 94c703a..3e779f0 100644
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -68,6 +68,7 @@
pci64-$(CONFIG_PPC64) += pci_64.o pci_dn.o
pci32-$(CONFIG_PPC32) := pci_32.o
obj-$(CONFIG_PCI) += $(pci64-y) $(pci32-y)
+obj-$(CONFIG_PCI_MSI) += msi.o
kexec-$(CONFIG_PPC64) := machine_kexec_64.o
kexec-$(CONFIG_PPC32) := machine_kexec_32.o
obj-$(CONFIG_KEXEC) += machine_kexec.o crash.o $(kexec-y)
diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c
new file mode 100644
index 0000000..c62d101
--- /dev/null
+++ b/arch/powerpc/kernel/msi.c
@@ -0,0 +1,38 @@
+/*
+ * 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; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/msi.h>
+
+#include <asm/machdep.h>
+
+int arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
+{
+ if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
+ pr_debug("msi: Platform doesn't provide MSI callbacks.\n");
+ return -ENOSYS;
+ }
+
+ if (ppc_md.msi_check_device) {
+ pr_debug("msi: Using platform check routine.\n");
+ return ppc_md.msi_check_device(dev, nvec, type);
+ }
+
+ return 0;
+}
+
+int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ return ppc_md.setup_msi_irqs(dev, nvec, type);
+}
+
+void arch_teardown_msi_irqs(struct pci_dev *dev)
+{
+ return ppc_md.teardown_msi_irqs(dev);
+}
diff --git a/include/asm-powerpc/machdep.h b/include/asm-powerpc/machdep.h
index daa08b1..6cf1a83 100644
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -120,6 +120,14 @@
/* To setup PHBs when using automatic OF platform driver for PCI */
int (*pci_setup_phb)(struct pci_controller *host);
+#ifdef CONFIG_PCI_MSI
+ int (*msi_check_device)(struct pci_dev* dev,
+ int nvec, int type);
+ int (*setup_msi_irqs)(struct pci_dev *dev,
+ int nvec, int type);
+ void (*teardown_msi_irqs)(struct pci_dev *dev);
+#endif
+
void (*restart)(char *cmd);
void (*power_off)(void);
void (*halt)(void);