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authorRam Pai <linuxram@us.ibm.com>2011-02-14 17:43:17 -0800
committerJesse Barnes <jbarnes@virtuousgeek.org>2011-03-04 10:45:48 -0800
commit13583b16592a9a85093dd9aa3d4e8cd76e4f0cd4 (patch)
tree72e598db87ae0415d6f137a768203748e426f70f /drivers/pci/setup-bus.c
parent87e3dc3855430bd254370afc79f2ed92250f5b7c (diff)
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PCI: refactor io size calculation code
Refactor code that calculates the io size in pbus_size_io() and pbus_mem_io() into separate functions. Signed-off-by: Ram Pai <linuxram@us.ibm.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'drivers/pci/setup-bus.c')
-rw-r--r--drivers/pci/setup-bus.c66
1 files changed, 42 insertions, 24 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 66cb8f4cc5f4..21212155eaba 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -404,6 +404,43 @@ static struct resource *find_free_bus_resource(struct pci_bus *bus, unsigned lon
return NULL;
}
+static resource_size_t calculate_iosize(resource_size_t size,
+ resource_size_t min_size,
+ resource_size_t size1,
+ resource_size_t old_size,
+ resource_size_t align)
+{
+ if (size < min_size)
+ size = min_size;
+ if (old_size == 1 )
+ old_size = 0;
+ /* To be fixed in 2.5: we should have sort of HAVE_ISA
+ flag in the struct pci_bus. */
+#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
+ size = (size & 0xff) + ((size & ~0xffUL) << 2);
+#endif
+ size = ALIGN(size + size1, align);
+ if (size < old_size)
+ size = old_size;
+ return size;
+}
+
+static resource_size_t calculate_memsize(resource_size_t size,
+ resource_size_t min_size,
+ resource_size_t size1,
+ resource_size_t old_size,
+ resource_size_t align)
+{
+ if (size < min_size)
+ size = min_size;
+ if (old_size == 1 )
+ old_size = 0;
+ if (size < old_size)
+ size = old_size;
+ size = ALIGN(size + size1, align);
+ return size;
+}
+
/* Sizing the IO windows of the PCI-PCI bridge is trivial,
since these windows have 4K granularity and the IO ranges
of non-bridge PCI devices are limited to 256 bytes.
@@ -412,7 +449,7 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
{
struct pci_dev *dev;
struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO);
- unsigned long size = 0, size1 = 0, old_size;
+ unsigned long size = 0, size1 = 0;
if (!b_res)
return;
@@ -435,19 +472,8 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size)
size1 += r_size;
}
}
- if (size < min_size)
- size = min_size;
- old_size = resource_size(b_res);
- if (old_size == 1)
- old_size = 0;
-/* To be fixed in 2.5: we should have sort of HAVE_ISA
- flag in the struct pci_bus. */
-#if defined(CONFIG_ISA) || defined(CONFIG_EISA)
- size = (size & 0xff) + ((size & ~0xffUL) << 2);
-#endif
- size = ALIGN(size + size1, 4096);
- if (size < old_size)
- size = old_size;
+ size = calculate_iosize(size, min_size, size1,
+ resource_size(b_res), 4096);
if (!size) {
if (b_res->start || b_res->end)
dev_info(&bus->self->dev, "disabling bridge window "
@@ -468,7 +494,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
unsigned long type, resource_size_t min_size)
{
struct pci_dev *dev;
- resource_size_t min_align, align, size, old_size;
+ resource_size_t min_align, align, size;
resource_size_t aligns[12]; /* Alignments from 1Mb to 2Gb */
int order, max_order;
struct resource *b_res = find_free_bus_resource(bus, type);
@@ -516,14 +542,6 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
mem64_mask &= r->flags & IORESOURCE_MEM_64;
}
}
- if (size < min_size)
- size = min_size;
- old_size = resource_size(b_res);
- if (old_size == 1)
- old_size = 0;
- if (size < old_size)
- size = old_size;
-
align = 0;
min_align = 0;
for (order = 0; order <= max_order; order++) {
@@ -537,7 +555,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
min_align = align1 >> 1;
align += aligns[order];
}
- size = ALIGN(size, min_align);
+ size = calculate_memsize(size, min_size, 0, resource_size(b_res), align);
if (!size) {
if (b_res->start || b_res->end)
dev_info(&bus->self->dev, "disabling bridge window "