mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
613e7ed6f7
Add a function to map a given resource number to a corresponding register so drivers can get the offset and type of device specific BARs. Signed-off-by: Yu Zhao <yu.zhao@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
293 lines
6.8 KiB
C
293 lines
6.8 KiB
C
/*
|
|
* 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"
|
|
|
|
|
|
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, ®ion, res);
|
|
|
|
dev_dbg(&dev->dev, "BAR %d: got res %pR bus [%#llx-%#llx] "
|
|
"flags %#lx\n", resno, res,
|
|
(unsigned long long)region.start,
|
|
(unsigned long long)region.end,
|
|
(unsigned long)res->flags);
|
|
|
|
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 ((new & (PCI_BASE_ADDRESS_SPACE|PCI_BASE_ADDRESS_MEM_TYPE_MASK)) ==
|
|
(PCI_BASE_ADDRESS_SPACE_MEMORY|PCI_BASE_ADDRESS_MEM_TYPE_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: moved to bus [%#llx-%#llx] flags %#lx\n",
|
|
resno, (unsigned long long)region.start,
|
|
(unsigned long long)region.end, res->flags);
|
|
}
|
|
|
|
int 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;
|
|
|
|
root = pcibios_select_root(dev, res);
|
|
|
|
err = -EINVAL;
|
|
if (root != NULL)
|
|
err = insert_resource(root, res);
|
|
|
|
if (err) {
|
|
dev_err(&dev->dev, "BAR %d: %s of %s %pR\n",
|
|
resource,
|
|
root ? "address space collision on" :
|
|
"no parent found for",
|
|
dtype, res);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
int pci_assign_resource(struct pci_dev *dev, int resno)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
struct resource *res = dev->resource + resno;
|
|
resource_size_t size, min, align;
|
|
int ret;
|
|
|
|
size = resource_size(res);
|
|
min = (res->flags & IORESOURCE_IO) ? PCIBIOS_MIN_IO : PCIBIOS_MIN_MEM;
|
|
|
|
align = resource_alignment(res);
|
|
if (!align) {
|
|
dev_info(&dev->dev, "BAR %d: can't allocate resource (bogus "
|
|
"alignment) %pR flags %#lx\n",
|
|
resno, res, res->flags);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* 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) {
|
|
dev_info(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
|
|
resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
|
|
} else {
|
|
res->flags &= ~IORESOURCE_STARTALIGN;
|
|
if (resno < PCI_BRIDGE_RESOURCES)
|
|
pci_update_resource(dev, resno);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if 0
|
|
int pci_assign_resource_fixed(struct pci_dev *dev, int resno)
|
|
{
|
|
struct pci_bus *bus = dev->bus;
|
|
struct resource *res = dev->resource + resno;
|
|
unsigned int type_mask;
|
|
int i, ret = -EBUSY;
|
|
|
|
type_mask = IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_PREFETCH;
|
|
|
|
for (i = 0; i < PCI_BUS_NUM_RESOURCES; i++) {
|
|
struct resource *r = bus->resource[i];
|
|
if (!r)
|
|
continue;
|
|
|
|
/* type_mask must match */
|
|
if ((res->flags ^ r->flags) & type_mask)
|
|
continue;
|
|
|
|
ret = request_resource(r, res);
|
|
|
|
if (ret == 0)
|
|
break;
|
|
}
|
|
|
|
if (ret) {
|
|
dev_err(&dev->dev, "BAR %d: can't allocate %s resource %pR\n",
|
|
resno, res->flags & IORESOURCE_IO ? "I/O" : "mem", res);
|
|
} else if (resno < PCI_BRIDGE_RESOURCES) {
|
|
pci_update_resource(dev, resno);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pci_assign_resource_fixed);
|
|
#endif
|
|
|
|
/* Sort resources by alignment */
|
|
void 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;
|
|
resource_size_t r_align;
|
|
|
|
r = &dev->resource[i];
|
|
|
|
if (r->flags & IORESOURCE_PCI_FIXED)
|
|
continue;
|
|
|
|
if (!(r->flags) || r->parent)
|
|
continue;
|
|
|
|
r_align = resource_alignment(r);
|
|
if (!r_align) {
|
|
dev_warn(&dev->dev, "BAR %d: bogus alignment "
|
|
"%pR flags %#lx\n",
|
|
i, r, r->flags);
|
|
continue;
|
|
}
|
|
for (list = head; ; list = list->next) {
|
|
resource_size_t align = 0;
|
|
struct resource_list *ln = list->next;
|
|
|
|
if (ln)
|
|
align = resource_alignment(ln->res);
|
|
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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 because of "
|
|
"BAR %d %pR collisions\n", i, 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;
|
|
}
|