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Message-ID: <20150722205316.GO21967@google.com>
Date: Wed, 22 Jul 2015 15:53:16 -0500
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Ray Jui <rjui@...adcom.com>
Cc: Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Arnd Bergmann <arnd@...db.de>,
Mark Rutland <mark.rutland@....com>,
Hauke Mehrtens <hauke@...ke-m.de>,
linux-kernel@...r.kernel.org,
bcm-kernel-feedback-list@...adcom.com,
linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH v4 1/4] PCI: iproc: enable arm64 support for iProc PCIe
On Tue, Jul 21, 2015 at 06:29:40PM -0700, Ray Jui wrote:
> 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 <rjui@...adcom.com>
> Reviewed-by: Scott Branden <sbranden@...adcom.com>
> ---
> 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;
I'm thinking something like the following so we don't depend on
pci_sys_data being at the beginning of iproc_pcie. What do you think?
It has more ifdefs but feels a bit safer. And I don't mind if ugly code
comes with ugly ifdefs -- it's a little incentive to make the code cleaner.
commit 8d9bfe3702aaea457b3d59b09b86e9f03c322605
Author: Ray Jui <rjui@...adcom.com>
Date: Tue Jul 21 18:29:40 2015 -0700
PCI: iproc: Add arm64 support
Add arm64 support to the iProc PCIe driver.
Note that on arm32, bus->sysdata points to the arm32-specific pci_sys_data
struct, and pci_sys_data.private_data contains the iproc_pcie pointer.
For arm64, there's nothing corresponding to pci_sys_data, so we keep the
iproc_pcie pointer directly in bus->sysdata.
In addition, arm64 does IRQ mapping in pcibios_add_device(), so it doesn't
need pci_fixup_irqs() as arm32 does.
Signed-off-by: Ray Jui <rjui@...adcom.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Scott Branden <sbranden@...adcom.com>
diff --git a/drivers/pci/host/pcie-iproc.c b/drivers/pci/host/pcie-iproc.c
index 9a00dca..fe2efb1 100644
--- a/drivers/pci/host/pcie-iproc.c
+++ b/drivers/pci/host/pcie-iproc.c
@@ -58,9 +58,17 @@
#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)
+static inline struct iproc_pcie *iproc_data(struct pci_bus *bus)
{
- return sys->private_data;
+ struct iproc_pcie *pcie;
+#ifdef CONFIG_ARM
+ struct pci_sys_data *sys = bus->sysdata;
+
+ pcie = sys->private_data;
+#else
+ pcie = bus->sysdata;
+#endif
+ return pcie;
}
/**
@@ -71,8 +79,7 @@ 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 = iproc_data(bus);
unsigned slot = PCI_SLOT(devfn);
unsigned fn = PCI_FUNC(devfn);
unsigned busno = bus->number;
@@ -186,6 +193,7 @@ static void iproc_pcie_enable(struct iproc_pcie *pcie)
int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
{
int ret;
+ void *sysdata;
struct pci_bus *bus;
if (!pcie || !pcie->dev || !pcie->base)
@@ -205,10 +213,14 @@ int iproc_pcie_setup(struct iproc_pcie *pcie, struct list_head *res)
iproc_pcie_reset(pcie);
+#ifdef CONFIG_ARM
pcie->sysdata.private_data = pcie;
+ sysdata = &pcie->sysdata;
+#else
+ sysdata = pcie;
+#endif
- 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, sysdata, res);
if (!bus) {
dev_err(pcie->dev, "unable to create PCI root bus\n");
ret = -ENOMEM;
@@ -226,7 +238,9 @@ 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..c9e4c10 100644
--- a/drivers/pci/host/pcie-iproc.h
+++ b/drivers/pci/host/pcie-iproc.h
@@ -21,7 +21,7 @@
* @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
+ * @sysdata: Per PCI controller data (ARM-specific)
* @root_bus: pointer to root bus
* @phy: optional PHY device that controls the Serdes
* @irqs: interrupt IDs
@@ -29,7 +29,9 @@
struct iproc_pcie {
struct device *dev;
void __iomem *base;
+#ifdef CONFIG_ARM
struct pci_sys_data sysdata;
+#endif
struct pci_bus *root_bus;
struct phy *phy;
int irqs[IPROC_PCIE_MAX_NUM_IRQS];
--
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