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drivers: pci: add API to issue FLR on a PCI function if supported

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Adds dm_pci_flr API that issues a Function Level reset on a PCI-e function,
if FLR is supported.

Signed-off-by: Alex Marginean <alexm.osslist@gmail.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Alex Marginean
2019-06-07 11:24:25 +03:00
committed by Simon Glass
parent 21ebbafde8
commit b8e1f8270c
2 changed files with 38 additions and 0 deletions
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24
drivers/pci/pci-uclass.c
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@@ -1494,6 +1494,30 @@ int dm_pci_find_ext_capability(struct udevice *dev, int cap)
return dm_pci_find_next_ext_capability(dev, 0, cap);
}
int dm_pci_flr(struct udevice *dev)
{
int pcie_off;
u32 cap;
/* look for PCI Express Capability */
pcie_off = dm_pci_find_capability(dev, PCI_CAP_ID_EXP);
if (!pcie_off)
return -ENOENT;
/* check FLR capability */
dm_pci_read_config32(dev, pcie_off + PCI_EXP_DEVCAP, &cap);
if (!(cap & PCI_EXP_DEVCAP_FLR))
return -ENOENT;
dm_pci_clrset_config16(dev, pcie_off + PCI_EXP_DEVCTL, 0,
PCI_EXP_DEVCTL_BCR_FLR);
/* wait 100ms, per PCI spec */
mdelay(100);
return 0;
}
UCLASS_DRIVER(pci) = {
.id = UCLASS_PCI,
.name = "pci",