Commit 13583b16 authored by Ram Pai's avatar Ram Pai Committed by Jesse Barnes
Browse files

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: default avatarRam Pai <linuxram@us.ibm.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 87e3dc38

drivers/pci/setup-bus.c

+42 −24
Original line number Diff line number Diff line
@@ -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 "

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