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PCI: Add support for AGP in cur/max bus speed

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Take advantage of some gaps in the table to fit in support for AGP speeds.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Matthew Wilcox 2009-12-13 08:11:34 -05:00 committed by Jesse Barnes
parent 9be60ca049
commit 45b4cdd57e
3 changed files with 55 additions and 5 deletions
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45
drivers/pci/probe.c
View File

@ -437,11 +437,56 @@ void pcie_update_link_speed(struct pci_bus *bus, u16 linksta)
}
EXPORT_SYMBOL_GPL(pcie_update_link_speed);
static unsigned char agp_speeds[] = {
AGP_UNKNOWN,
AGP_1X,
AGP_2X,
AGP_4X,
AGP_8X
};
static enum pci_bus_speed agp_speed(int agp3, int agpstat)
{
int index = 0;
if (agpstat & 4)
index = 3;
else if (agpstat & 2)
index = 2;
else if (agpstat & 1)
index = 1;
else
goto out;
if (agp3) {
index += 2;
if (index == 5)
index = 0;
}
out:
return agp_speeds[index];
}
static void pci_set_bus_speed(struct pci_bus *bus)
{
struct pci_dev *bridge = bus->self;
int pos;
pos = pci_find_capability(bridge, PCI_CAP_ID_AGP);
if (!pos)
pos = pci_find_capability(bridge, PCI_CAP_ID_AGP3);
if (pos) {
u32 agpstat, agpcmd;
pci_read_config_dword(bridge, pos + PCI_AGP_STATUS, &agpstat);
bus->max_bus_speed = agp_speed(agpstat & 8, agpstat & 7);
pci_read_config_dword(bridge, pos + PCI_AGP_COMMAND, &agpcmd);
bus->cur_bus_speed = agp_speed(agpstat & 8, agpcmd & 7);
}
pos = pci_find_capability(bridge, PCI_CAP_ID_PCIX);
if (pos) {
u16 status;

10
drivers/pci/slot.c
View File

@ -61,11 +61,11 @@ static char *pci_bus_speed_strings[] = {
"66 MHz PCI-X 266", /* 0x09 */
"100 MHz PCI-X 266", /* 0x0a */
"133 MHz PCI-X 266", /* 0x0b */
NULL, /* 0x0c */
NULL, /* 0x0d */
NULL, /* 0x0e */
NULL, /* 0x0f */
NULL, /* 0x10 */
"Unknown AGP", /* 0x0c */
"1x AGP", /* 0x0d */
"2x AGP", /* 0x0e */
"4x AGP", /* 0x0f */
"8x AGP", /* 0x10 */
"66 MHz PCI-X 533", /* 0x11 */
"100 MHz PCI-X 533", /* 0x12 */
"133 MHz PCI-X 533", /* 0x13 */

5
include/linux/pci.h
View File

@ -200,6 +200,11 @@ enum pci_bus_speed {
PCI_SPEED_66MHz_PCIX_266 = 0x09,
PCI_SPEED_100MHz_PCIX_266 = 0x0a,
PCI_SPEED_133MHz_PCIX_266 = 0x0b,
AGP_UNKNOWN = 0x0c,
AGP_1X = 0x0d,
AGP_2X = 0x0e,
AGP_4X = 0x0f,
AGP_8X = 0x10,
PCI_SPEED_66MHz_PCIX_533 = 0x11,
PCI_SPEED_100MHz_PCIX_533 = 0x12,
PCI_SPEED_133MHz_PCIX_533 = 0x13,