[PATCH 2/5 RFC] powerpc: pci: Add arch specific msi region interface

[Bharat Bhushan]

This patch adds the interface to get the msi region information from arch
specific code. The machine spicific code is not yet defined.

Signed-off-by: Bharat Bhushan <bharat.bhus...@freescale.com>
---
 arch/powerpc/include/asm/machdep.h |    8 ++++++++
 arch/powerpc/kernel/msi.c          |   18 ++++++++++++++++++
 2 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/include/asm/machdep.h 
b/arch/powerpc/include/asm/machdep.h
index 8b48090..8d1b787 100644
--- a/arch/powerpc/include/asm/machdep.h
+++ b/arch/powerpc/include/asm/machdep.h
@@ -30,6 +30,7 @@ struct file;
 struct pci_controller;
 struct kimage;
 struct pci_host_bridge;
+struct msi_region;
 
 struct machdep_calls {
        char            *name;
@@ -124,6 +125,13 @@ struct machdep_calls {
        int             (*setup_msi_irqs)(struct pci_dev *dev,
                                          int nvec, int type);
        void            (*teardown_msi_irqs)(struct pci_dev *dev);
+
+       /* Returns the number of MSI regions (banks) */
+       int             (*msi_get_region_count)(void);
+
+       /* Returns the requested region's address and size */
+       int             (*msi_get_region)(int region_num,
+                                         struct msi_region *region);
 #endif
 
        void            (*restart)(char *cmd);
diff --git a/arch/powerpc/kernel/msi.c b/arch/powerpc/kernel/msi.c
index 8bbc12d..1a67787 100644
--- a/arch/powerpc/kernel/msi.c
+++ b/arch/powerpc/kernel/msi.c
@@ -13,6 +13,24 @@
 
 #include <asm/machdep.h>
 
+int arch_msi_get_region_count(void)
+{
+       if (ppc_md.msi_get_region_count) {
+               pr_debug("msi: Using platform get_region_count routine.\n");
+               return ppc_md.msi_get_region_count();
+       }
+       return 0;
+}
+
+int arch_msi_get_region(int region_num, struct msi_region *region)
+{
+       if (ppc_md.msi_get_region) {
+               pr_debug("msi: Using platform get_region routine.\n");
+               return ppc_md.msi_get_region(region_num, region);
+       }
+       return 0;
+}
+
 int arch_msi_check_device(struct pci_dev* dev, int nvec, int type)
 {
        if (!ppc_md.setup_msi_irqs || !ppc_md.teardown_msi_irqs) {
-- 
1.7.0.4


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