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

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Message-ID: <1383046062-16520-4-git-send-email-Bharat.Bhushan@freescale.com>
Date:	Tue, 29 Oct 2013 16:57:40 +0530
From:	Bharat Bhushan <r65777@...escale.com>
To:	<alex.williamson@...hat.com>, <joro@...tes.org>,
	<galak@...nel.crashing.org>, <scottwood@...escale.com>,
	<linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>,
	<linux-pci@...r.kernel.org>, <agraf@...e.de>,
	<stuart.yoder@...escale.com>
CC:	Bharat Bhushan <Bharat.Bhushan@...escale.com>,
	Bharat Bhushan <bharat.bhushan@...escale.com>
Subject: [PATCH 2/5 RFC] powerpc: pci: Add arch specific msi region interface

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.bhushan@...escale.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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