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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/pci/setup-res.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/pci/setup-res.c')
-rw-r--r--drivers/pci/setup-res.c200
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
new file mode 100644
index 000000000000..1ca21d2ba11c
--- /dev/null
+++ b/drivers/pci/setup-res.c
@@ -0,0 +1,200 @@
+/*
+ * drivers/pci/setup-res.c
+ *
+ * Extruded from code written by
+ * Dave Rusling (david.rusling@reo.mts.dec.com)
+ * David Mosberger (davidm@cs.arizona.edu)
+ * David Miller (davem@redhat.com)
+ *
+ * Support routines for initializing a PCI subsystem.
+ */
+
+/* fixed for multiple pci buses, 1999 Andrea Arcangeli <andrea@suse.de> */
+
+/*
+ * Nov 2000, Ivan Kokshaysky <ink@jurassic.park.msu.ru>
+ * Resource sorting
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/cache.h>
+#include <linux/slab.h>
+#include "pci.h"
+
+
+static void
+pci_update_resource(struct pci_dev *dev, struct resource *res, int resno)
+{
+ struct pci_bus_region region;
+ u32 new, check, mask;
+ int reg;
+
+ pcibios_resource_to_bus(dev, &region, res);
+
+ pr_debug(" got res [%lx:%lx] bus [%lx:%lx] flags %lx for "
+ "BAR %d of %s\n", res->start, res->end,
+ region.start, region.end, res->flags, resno, pci_name(dev));
+
+ new = region.start | (res->flags & PCI_REGION_FLAG_MASK);
+ if (res->flags & IORESOURCE_IO)
+ mask = (u32)PCI_BASE_ADDRESS_IO_MASK;
+ else
+ mask = (u32)PCI_BASE_ADDRESS_MEM_MASK;
+
+ if (resno < 6) {
+ reg = PCI_BASE_ADDRESS_0 + 4 * resno;
+ } else if (resno == PCI_ROM_RESOURCE) {
+ new |= res->flags & IORESOURCE_ROM_ENABLE;
+ reg = dev->rom_base_reg;
+ } else {
+ /* Hmm, non-standard resource. */
+
+ return; /* kill uninitialised var warning */
+ }
+
+ pci_write_config_dword(dev, reg, new);
+ pci_read_config_dword(dev, reg, &check);
+
+ if ((new ^ check) & mask) {
+ printk(KERN_ERR "PCI: Error while updating region "
+ "%s/%d (%08x != %08x)\n", pci_name(dev), resno,
+ new, check);
+ }
+
+ if ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
+ (PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_64)) {
+ new = 0; /* currently everyone zeros the high address */
+ pci_write_config_dword(dev, reg + 4, new);
+ pci_read_config_dword(dev, reg + 4, &check);
+ if (check != new) {
+ printk(KERN_ERR "PCI: Error updating region "
+ "%s/%d (high %08x != %08x)\n",
+ pci_name(dev), resno, new, check);
+ }
+ }
+ res->flags &= ~IORESOURCE_UNSET;
+ pr_debug("PCI: moved device %s resource %d (%lx) to %x\n",
+ pci_name(dev), resno, res->flags,
+ new & ~PCI_REGION_FLAG_MASK);
+}
+
+int __devinit
+pci_claim_resource(struct pci_dev *dev, int resource)
+{
+ struct resource *res = &dev->resource[resource];
+ struct resource *root = NULL;
+ char *dtype = resource < PCI_BRIDGE_RESOURCES ? "device" : "bridge";
+ int err;
+
+ if (res->flags & IORESOURCE_IO)
+ root = &ioport_resource;
+ if (res->flags & IORESOURCE_MEM)
+ root = &iomem_resource;
+
+ err = -EINVAL;
+ if (root != NULL)
+ err = insert_resource(root, res);
+
+ if (err) {
+ printk(KERN_ERR "PCI: %s region %d of %s %s [%lx:%lx]\n",
+ root ? "Address space collision on" :
+ "No parent found for",
+ resource, dtype, pci_name(dev), res->start, res->end);
+ }
+
+ return err;
+}
+
+int pci_assign_resource(struct pci_dev *dev, int resno)
+{
+ struct pci_bus *bus = dev->bus;
+ struct resource *res = dev->resource + resno;
+ unsigned long size, min, align;
+ int ret;
+
+ size = res->end - res->start + 1;
+ min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
+ /* The bridge resources are special, as their
+ size != alignment. Sizing routines return
+ required alignment in the "start" field. */
+ align = (resno < PCI_BRIDGE_RESOURCES) ? size : res->start;
+
+ /* First, try exact prefetching match.. */
+ ret = pci_bus_alloc_resource(bus, res, size, align, min,
+ IORESOURCE_PREFETCH,
+ pcibios_align_resource, dev);
+
+ if (ret < 0 && (res->flags & IORESOURCE_PREFETCH)) {
+ /*
+ * That failed.
+ *
+ * But a prefetching area can handle a non-prefetching
+ * window (it will just not perform as well).
+ */
+ ret = pci_bus_alloc_resource(bus, res, size, align, min, 0,
+ pcibios_align_resource, dev);
+ }
+
+ if (ret) {
+ printk(KERN_ERR "PCI: Failed to allocate %s resource #%d:%lx@%lx for %s\n",
+ res->flags & IORESOURCE_IO ? "I/O" : "mem",
+ resno, size, res->start, pci_name(dev));
+ } else if (resno < PCI_BRIDGE_RESOURCES) {
+ pci_update_resource(dev, res, resno);
+ }
+
+ return ret;
+}
+
+/* Sort resources by alignment */
+void __devinit
+pdev_sort_resources(struct pci_dev *dev, struct resource_list *head)
+{
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ struct resource *r;
+ struct resource_list *list, *tmp;
+ unsigned long r_align;
+
+ r = &dev->resource[i];
+ r_align = r->end - r->start;
+
+ if (!(r->flags) || r->parent)
+ continue;
+ if (!r_align) {
+ printk(KERN_WARNING "PCI: Ignore bogus resource %d "
+ "[%lx:%lx] of %s\n",
+ i, r->start, r->end, pci_name(dev));
+ continue;
+ }
+ r_align = (i < PCI_BRIDGE_RESOURCES) ? r_align + 1 : r->start;
+ for (list = head; ; list = list->next) {
+ unsigned long align = 0;
+ struct resource_list *ln = list->next;
+ int idx;
+
+ if (ln) {
+ idx = ln->res - &ln->dev->resource[0];
+ align = (idx < PCI_BRIDGE_RESOURCES) ?
+ ln->res->end - ln->res->start + 1 :
+ ln->res->start;
+ }
+ if (r_align > align) {
+ tmp = kmalloc(sizeof(*tmp), GFP_KERNEL);
+ if (!tmp)
+ panic("pdev_sort_resources(): "
+ "kmalloc() failed!\n");
+ tmp->next = ln;
+ tmp->res = r;
+ tmp->dev = dev;
+ list->next = tmp;
+ break;
+ }
+ }
+ }
+}