diff options
| author | Matthew Wilcox <matthew@wil.cx> | 2009-12-13 08:11:34 -0500 |
|---|---|---|
| committer | Jesse Barnes <jbarnes@virtuousgeek.org> | 2010-02-22 16:15:19 -0800 |
| commit | 45b4cdd57ef0e57555b2ab61b584784819b39365 (patch) | |
| tree | 1e08008e0cdc57252022b5ad1a0e3029c7e96f99 /drivers/pci | |
| parent | 9be60ca0497a2563662fde4c9007841c3b79a742 (diff) | |
| download | op-kernel-dev-45b4cdd57ef0e57555b2ab61b584784819b39365.zip op-kernel-dev-45b4cdd57ef0e57555b2ab61b584784819b39365.tar.gz | |
PCI: Add support for AGP in cur/max bus speed
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/probe.c | 45 | ||||
| -rw-r--r-- | drivers/pci/slot.c | 10 |
2 files changed, 50 insertions, 5 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 188ee9c..2803ab9 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -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; diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c index 6f6b8d2..c7260d4 100644 --- a/drivers/pci/slot.c +++ b/drivers/pci/slot.c @@ -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 */ |
