/drivers/pci/setup-res.c
C | 341 lines | 243 code | 50 blank | 48 comment | 44 complexity | 3cdebb56edc52812bde96a7b005efb33 MD5 | raw file
- /*
- * 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/export.h>
- #include <linux/pci.h>
- #include <linux/errno.h>
- #include <linux/ioport.h>
- #include <linux/cache.h>
- #include <linux/slab.h>
- #include "pci.h"
- void pci_update_resource(struct pci_dev *dev, int resno)
- {
- struct pci_bus_region region;
- u32 new, check, mask;
- int reg;
- enum pci_bar_type type;
- struct resource *res = dev->resource + resno;
- /*
- * Ignore resources for unimplemented BARs and unused resource slots
- * for 64 bit BARs.
- */
- if (!res->flags)
- return;
- /*
- * Ignore non-moveable resources. This might be legacy resources for
- * which no functional BAR register exists or another important
- * system resource we shouldn't move around.
- */
- if (res->flags & IORESOURCE_PCI_FIXED)
- return;
- pcibios_resource_to_bus(dev->bus, ®ion, res);
- 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;
- reg = pci_resource_bar(dev, resno, &type);
- if (!reg)
- return;
- if (type != pci_bar_unknown) {
- if (!(res->flags & IORESOURCE_ROM_ENABLE))
- return;
- new |= PCI_ROM_ADDRESS_ENABLE;
- }
- pci_write_config_dword(dev, reg, new);
- pci_read_config_dword(dev, reg, &check);
- if ((new ^ check) & mask) {
- dev_err(&dev->dev, "BAR %d: error updating (%#08x != %#08x)\n",
- resno, new, check);
- }
- if (res->flags & IORESOURCE_MEM_64) {
- new = region.start >> 16 >> 16;
- pci_write_config_dword(dev, reg + 4, new);
- pci_read_config_dword(dev, reg + 4, &check);
- if (check != new) {
- dev_err(&dev->dev, "BAR %d: error updating "
- "(high %#08x != %#08x)\n", resno, new, check);
- }
- }
- res->flags &= ~IORESOURCE_UNSET;
- dev_dbg(&dev->dev, "BAR %d: set to %pR (PCI address [%#llx-%#llx])\n",
- resno, res, (unsigned long long)region.start,
- (unsigned long long)region.end);
- }
- int pci_claim_resource(struct pci_dev *dev, int resource)
- {
- struct resource *res = &dev->resource[resource];
- struct resource *root, *conflict;
- root = pci_find_parent_resource(dev, res);
- if (!root) {
- dev_info(&dev->dev, "no compatible bridge window for %pR\n",
- res);
- return -EINVAL;
- }
- conflict = request_resource_conflict(root, res);
- if (conflict) {
- dev_info(&dev->dev,
- "address space collision: %pR conflicts with %s %pR\n",
- res, conflict->name, conflict);
- return -EBUSY;
- }
- return 0;
- }
- EXPORT_SYMBOL(pci_claim_resource);
- void pci_disable_bridge_window(struct pci_dev *dev)
- {
- dev_info(&dev->dev, "disabling bridge mem windows\n");
- /* MMIO Base/Limit */
- pci_write_config_dword(dev, PCI_MEMORY_BASE, 0x0000fff0);
- /* Prefetchable MMIO Base/Limit */
- pci_write_config_dword(dev, PCI_PREF_LIMIT_UPPER32, 0);
- pci_write_config_dword(dev, PCI_PREF_MEMORY_BASE, 0x0000fff0);
- pci_write_config_dword(dev, PCI_PREF_BASE_UPPER32, 0xffffffff);
- }
- static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
- int resno, resource_size_t size, resource_size_t align)
- {
- struct resource *res = dev->resource + resno;
- resource_size_t min;
- int ret;
- min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
- /* 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);
- }
- return ret;
- }
- /*
- * Generic function that returns a value indicating that the device's
- * original BIOS BAR address was not saved and so is not available for
- * reinstatement.
- *
- * Can be over-ridden by architecture specific code that implements
- * reinstatement functionality rather than leaving it disabled when
- * normal allocation attempts fail.
- */
- resource_size_t __weak pcibios_retrieve_fw_addr(struct pci_dev *dev, int idx)
- {
- return 0;
- }
- static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
- int resno, resource_size_t size)
- {
- struct resource *root, *conflict;
- resource_size_t fw_addr, start, end;
- int ret = 0;
- fw_addr = pcibios_retrieve_fw_addr(dev, resno);
- if (!fw_addr)
- return 1;
- start = res->start;
- end = res->end;
- res->start = fw_addr;
- res->end = res->start + size - 1;
- root = pci_find_parent_resource(dev, res);
- if (!root) {
- if (res->flags & IORESOURCE_IO)
- root = &ioport_resource;
- else
- root = &iomem_resource;
- }
- dev_info(&dev->dev, "BAR %d: trying firmware assignment %pR\n",
- resno, res);
- conflict = request_resource_conflict(root, res);
- if (conflict) {
- dev_info(&dev->dev,
- "BAR %d: %pR conflicts with %s %pR\n", resno,
- res, conflict->name, conflict);
- res->start = start;
- res->end = end;
- ret = 1;
- }
- return ret;
- }
- static int _pci_assign_resource(struct pci_dev *dev, int resno,
- resource_size_t size, resource_size_t min_align)
- {
- struct resource *res = dev->resource + resno;
- struct pci_bus *bus;
- int ret;
- char *type;
- bus = dev->bus;
- while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
- if (!bus->parent || !bus->self->transparent)
- break;
- bus = bus->parent;
- }
- if (ret) {
- if (res->flags & IORESOURCE_MEM)
- if (res->flags & IORESOURCE_PREFETCH)
- type = "mem pref";
- else
- type = "mem";
- else if (res->flags & IORESOURCE_IO)
- type = "io";
- else
- type = "unknown";
- dev_info(&dev->dev,
- "BAR %d: can't assign %s (size %#llx)\n",
- resno, type, (unsigned long long) resource_size(res));
- }
- return ret;
- }
- int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsize,
- resource_size_t min_align)
- {
- struct resource *res = dev->resource + resno;
- resource_size_t new_size;
- int ret;
- if (!res->parent) {
- dev_info(&dev->dev, "BAR %d: can't reassign an unassigned resource %pR "
- "\n", resno, res);
- return -EINVAL;
- }
- /* already aligned with min_align */
- new_size = resource_size(res) + addsize;
- ret = _pci_assign_resource(dev, resno, new_size, min_align);
- if (!ret) {
- res->flags &= ~IORESOURCE_STARTALIGN;
- dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
- if (resno < PCI_BRIDGE_RESOURCES)
- pci_update_resource(dev, resno);
- }
- return ret;
- }
- int pci_assign_resource(struct pci_dev *dev, int resno)
- {
- struct resource *res = dev->resource + resno;
- resource_size_t align, size;
- struct pci_bus *bus;
- int ret;
- align = pci_resource_alignment(dev, res);
- if (!align) {
- dev_info(&dev->dev, "BAR %d: can't assign %pR "
- "(bogus alignment)\n", resno, res);
- return -EINVAL;
- }
- bus = dev->bus;
- size = resource_size(res);
- ret = _pci_assign_resource(dev, resno, size, align);
- /*
- * If we failed to assign anything, let's try the address
- * where firmware left it. That at least has a chance of
- * working, which is better than just leaving it disabled.
- */
- if (ret < 0)
- ret = pci_revert_fw_address(res, dev, resno, size);
- if (!ret) {
- res->flags &= ~IORESOURCE_STARTALIGN;
- dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
- if (resno < PCI_BRIDGE_RESOURCES)
- pci_update_resource(dev, resno);
- }
- return ret;
- }
- int pci_enable_resources(struct pci_dev *dev, int mask)
- {
- u16 cmd, old_cmd;
- int i;
- struct resource *r;
- pci_read_config_word(dev, PCI_COMMAND, &cmd);
- old_cmd = cmd;
- for (i = 0; i < PCI_NUM_RESOURCES; i++) {
- if (!(mask & (1 << i)))
- continue;
- r = &dev->resource[i];
- if (!(r->flags & (IORESOURCE_IO | IORESOURCE_MEM)))
- continue;
- if ((i == PCI_ROM_RESOURCE) &&
- (!(r->flags & IORESOURCE_ROM_ENABLE)))
- continue;
- if (!r->parent) {
- dev_err(&dev->dev, "device not available "
- "(can't reserve %pR)\n", r);
- return -EINVAL;
- }
- if (r->flags & IORESOURCE_IO)
- cmd |= PCI_COMMAND_IO;
- if (r->flags & IORESOURCE_MEM)
- cmd |= PCI_COMMAND_MEMORY;
- }
- if (cmd != old_cmd) {
- dev_info(&dev->dev, "enabling device (%04x -> %04x)\n",
- old_cmd, cmd);
- pci_write_config_word(dev, PCI_COMMAND, cmd);
- }
- return 0;
- }