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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>
This commit is contained in:
Ram Pai 2011-02-14 17:43:17 -08:00 committed by Jesse Barnes
parent 87e3dc3855
commit 13583b1659
1 changed files with 42 additions and 24 deletions
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66
drivers/pci/setup-bus.c
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@ -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 "