Subject: [PATCH v4 1/4] PCI: iproc: enable arm64 support for iProc PCIe

From: [email-masked] (Ray Jui)
Date: Tue, 21 Jul 2015 18:29:40 -0700

This patch enables arm64 support to the iProc PCIe driver

Note struct pci_sys_data is arm32 specific and will eventually be
removed. This change is done in such a way that when struct pci_sys_data
is removed from arm32, one only needs to also remove it from
pcie-iproc.h, no other change in the iProc PCIe core driver is needed

In addition, arm64 based PCI driver does not require call to
pci_fixup_irqs, as it implements OF based irq parsing and mapping in
pcibios_add_device

Signed-off-by: Ray Jui <[email-masked]>
Reviewed-by: Scott Branden <[email-masked]>
---
 drivers/pci/host/pcie-iproc.c |   15 ++++-----------
 drivers/pci/host/pcie-iproc.h |    8 ++++++--
 2 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index d77481e..8a556d5 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -58,11 +58,6 @@
 #define SYS_RC_INTX_EN               0x330
 #define SYS_RC_INTX_MASK             0xf
 
-static inline struct iproc_pcie *sys_to_pcie(struct pci_sys_data *sys)
-{
-	return sys->private_data;
-}
-
 /**
  * Note access to the configuration registers are protected at the higher layer
  * by 'pci_lock' in drivers/pci/access.c
@@ -71,8 +66,7 @@ static void __iomem *iproc_pcie_map_cfg_bus(struct pci_bus *bus,
 					    unsigned int devfn,
 					    int where)
 {
-	struct pci_sys_data *sys = bus->sysdata;
-	struct iproc_pcie *pcie = sys_to_pcie(sys);
+	struct iproc_pcie *pcie = bus->sysdata;
 	unsigned slot = PCI_SLOT(devfn);
 	unsigned fn = PCI_FUNC(devfn);
 	unsigned busno = bus->number;
@@ -208,10 +202,7 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
 	iproc_pcie_reset(pcie);
 
-	pcie->sysdata.private_data = pcie;
-
-	bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops,
-				  &pcie->sysdata, res);
+	bus = pci_create_root_bus(pcie->dev, 0, &iproc_pcie_ops, pcie, res);
 	if (!bus) {
 		dev_err(pcie->dev, "unable to create PCI root bus\n");
 		ret = -ENOMEM;
@@ -229,7 +220,9 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
 
 	pci_scan_child_bus(bus);
 	pci_assign_unassigned_bus_resources(bus);
+#ifdef CONFIG_ARM
 	pci_fixup_irqs(pci_common_swizzle, pcie->map_irq);
+#endif
 	pci_bus_add_devices(bus);
 
 	return 0;
diff --git a/drivers/pci/host/pcie-iproc.h b/drivers/pci/host/pcie-iproc.h
index ba0a108..0ee9673 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -18,18 +18,22 @@
 
 /**
  * iProc PCIe device
+ * @sysdata: Per PCI controller data. This needs to be kept at the beginning of
+ * struct iproc_pcie, to enable support of both ARM32 and ARM64 platforms with
+ * minimal changes in the iProc PCIe core driver
  * @dev: pointer to device data structure
  * @base: PCIe host controller I/O register base
  * @resources: linked list of all PCI resources
- * @sysdata: Per PCI controller data
  * @root_bus: pointer to root bus
  * @phy: optional PHY device that controls the Serdes
  * @irqs: interrupt IDs
  */
 struct iproc_pcie {
+#ifdef CONFIG_ARM
+	struct pci_sys_data sysdata;
+#endif
 	struct device *dev;
 	void __iomem *base;
-	struct pci_sys_data sysdata;
 	struct pci_bus *root_bus;
 	struct phy *phy;
 	int irqs[IPROC_PCIE_MAX_NUM_IRQS];
-- 
1.7.9.5