[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 (file)
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -682,6 +682,7 @@ config PCI
                && !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 (file)
--- a/arch/powerpc/kernel/Makefile
+++ b/arch/powerpc/kernel/Makefile
@@ -68,6 +68,7 @@ obj-$(CONFIG_MODULES)         += $(module-y)
 pci64-$(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 (file)
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 (file)
--- a/include/asm-powerpc/machdep.h
+++ b/include/asm-powerpc/machdep.h
@@ -120,6 +120,14 @@ struct machdep_calls {
        /* 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);