ARM: 7683/1: pci: add a align_resource hook

The PCI specifications says that an I/O region must be aligned on a 4
KB boundary, and a memory region aligned on a 1 MB boundary.

However, the Marvell PCIe interfaces rely on address decoding windows
(which allow to associate a range of physical addresses with a given
device). For PCIe memory windows, those windows are defined with a 1
MB granularity (which matches the PCI specs), but PCIe I/O windows can
only be defined with a 64 KB granularity, so they have to be 64 KB
aligned. We therefore need to tell the PCI core about this special
alignement requirement.

The PCI core already calls pcibios_align_resource() in the ARM PCI
core, specifically for such purposes. So this patch extends the ARM
PCI core so that it calls a ->align_resource() hook registered by the
PCI driver, exactly like the existing ->map_irq() and ->swizzle()
hooks.

A particular PCI driver can register a align_resource() hook, and do
its own specific alignement, depending on the specific constraints of
the underlying hardware.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/include/asm/mach/pci.h b/arch/arm/include/asm/mach/pci.h
index 5cf2e979b4be..7d2c3c843801 100644
--- a/arch/arm/include/asm/mach/pci.h
+++ b/arch/arm/include/asm/mach/pci.h
@@ -30,6 +30,11 @@ struct hw_pci {
         void            (*postinit)(void);
         u8              (*swizzle)(struct pci_dev *dev, u8 *pin);
         int             (*map_irq)(const struct pci_dev *dev, u8 slot, u8 pin);
+        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);
 };
 
 /*
@@ -51,6 +56,12 @@ 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 a1f73b502ef0..b2ed73c45489 100644
--- a/arch/arm/kernel/bios32.c
+++ b/arch/arm/kernel/bios32.c
@@ -462,6 +462,7 @@ static void pcibios_init_hw(struct hw_pci *hw, struct list_head *head)
                 sys->busnr   = busnr;
                 sys->swizzle = hw->swizzle;
                 sys->map_irq = hw->map_irq;
+                sys->align_resource = hw->align_resource;
                 INIT_LIST_HEAD(&sys->resources);
 
                 if (hw->private_data)
@@ -574,6 +575,8 @@ char * __init pcibios_setup(char *str)
 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)
@@ -581,6 +584,9 @@ 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);
+
         return start;
 }