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PCI: Extend pci_reset_function() to support PCI Advanced Features 

Some PCI devices implement PCI Advanced Features, which means they
support Function Level Reset(FLR).  Implement support for that in
pci_reset_function.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Sheng Yang 2008-11-11 17:17:48 +08:00 committed by Jesse Barnes
parent f7b7baae6b
commit 1ca887970a
1 changed files with 41 additions and 0 deletions
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41
drivers/pci/pci.c
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@ -1789,6 +1789,43 @@ static int __pcie_flr(struct pci_dev *dev, int probe)
return 0;
}
static int __pci_af_flr(struct pci_dev *dev, int probe)
{
int cappos = pci_find_capability(dev, PCI_CAP_ID_AF);
u8 status;
u8 cap;
if (!cappos)
return -ENOTTY;
pci_read_config_byte(dev, cappos + PCI_AF_CAP, &cap);
if (!(cap & PCI_AF_CAP_TP) || !(cap & PCI_AF_CAP_FLR))
return -ENOTTY;
if (probe)
return 0;
pci_block_user_cfg_access(dev);
/* Wait for Transaction Pending bit clean */
msleep(100);
pci_read_config_byte(dev, cappos + PCI_AF_STATUS, &status);
if (status & PCI_AF_STATUS_TP) {
dev_info(&dev->dev, "Busy after 100ms while trying to"
" reset; sleeping for 1 second\n");
ssleep(1);
pci_read_config_byte(dev,
cappos + PCI_AF_STATUS, &status);
if (status & PCI_AF_STATUS_TP)
dev_info(&dev->dev, "Still busy after 1s; "
"proceeding with reset anyway\n");
}
pci_write_config_byte(dev, cappos + PCI_AF_CTRL, PCI_AF_CTRL_FLR);
mdelay(100);
pci_unblock_user_cfg_access(dev);
return 0;
}
static int __pci_reset_function(struct pci_dev *pdev, int probe)
{
int res;
@ -1797,6 +1834,10 @@ static int __pci_reset_function(struct pci_dev *pdev, int probe)
if (res != -ENOTTY)
return res;
res = __pci_af_flr(pdev, probe);
if (res != -ENOTTY)
return res;
return res;
}