ARM/PCI: Replace pci_sys_data->align_resource with global function pointer

dw_pcie_host_init() creates the PCI host bridge with pci_common_init_dev(),
an ARM-specific function that supplies the ARM-specific pci_sys_data
structure as the PCI "sysdata".  To use dw_pcie_host_init() on other
architectures, we will copy the internals of pci_common_init_dev() into
pcie-designware.c instead of calling it, and dw_pcie_host_init() will
supply the DesignWare pcie_port structure as "sysdata".

Most ARM "sysdata" users are specific to non-DesignWare host bridges;
they'll be unaffected because those bridges will continue to have the ARM
pci_sys_data.  Most of the rest are ARM-generic functions called by
pci_common_init_dev(); these will be unaffected because dw_pcie_host_init()
will no longer call pci_common_init().

But the ARM pcibios_align_resource() can be called by the PCI core for any
bridge, so it can't depend on sysdata since it may be either pci_sys_data
or pcie_port.

Remove the pcibios_align_resource() dependency on sysdata by replacing the
pci_sys_data->align_resource pointer with a global function pointer.

This is less general (we can no longer have per-host bridge
align_resource() methods), but the pci_sys_data->align_resource pointer was
used only by Marvell (see mvebu_pcie_enable()), so this would only be a
problem if we had a system with a combination of Marvell and other host
bridges

[bhelgaas: changelog]
Signed-off-by: Gabriele Paoloni <gabriele.paoloni@huawei.com>
Signed-off-by: Zhou Wang <wangzhou1@hisilicon.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>

diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
index 8857d28..0070e85 100644 (file)
--- a/arch/arm/include/asm/mach/pci.h
+++ b/arch/arm/include/asm/mach/pci.h
@@ -52,12 +52,6 @@ struct pci_sys_data {
        u8              (*swizzle)(struct pci_dev *, u8 *);
                                        /* IRQ mapping                          */
        int             (*map_irq)(const struct pci_dev *, u8, u8);
-                                       /* Resource alignement requirements     */
-       resource_size_t (*align_resource)(struct pci_dev *dev,
-                                         const struct resource *res,
-                                         resource_size_t start,
-                                         resource_size_t size,
-                                         resource_size_t align);
        void            *private_data;  /* platform controller private data     */
 };
 

diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
index 874e182..6551d28 100644 (file)
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -17,6 +17,11 @@
 #include <asm/mach/pci.h>
 
 static int debug_pci;
+static resource_size_t (*align_resource)(struct pci_dev *dev,
+                 const struct resource *res,
+                 resource_size_t start,
+                 resource_size_t size,
+                 resource_size_t align) = NULL;
 
 /*
  * We can't use pci_get_device() here since we are
@@ -456,7 +461,7 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
                sys->busnr   = busnr;
                sys->swizzle = hw->swizzle;
                sys->map_irq = hw->map_irq;
-               sys->align_resource = hw->align_resource;
+               align_resource = hw->align_resource;
                INIT_LIST_HEAD(&sys->resources);
 
                if (hw->private_data)
@@ -572,7 +577,6 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
                                resource_size_t size, resource_size_t align)
 {
        struct pci_dev *dev = data;
-       struct pci_sys_data *sys = dev->sysdata;
        resource_size_t start = res->start;
 
        if (res->flags & IORESOURCE_IO && start & 0x300)
@@ -580,8 +584,8 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 
        start = (start + align - 1) & ~(align - 1);
 
-       if (sys->align_resource)
-               return sys->align_resource(dev, res, start, size, align);
+       if (align_resource)
+               return align_resource(dev, res, start, size, align);
 
        return start;
 }