diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2018-10-15 02:21:21 -0700 |
|---|---|---|
| committer | Simon Glass <sjg@chromium.org> | 2018-11-14 09:16:28 -0800 |
| commit | a8c5f8d3d02807f72d048950d72b0c73d55bd7fb (patch) | |
| tree | d87519b5395d70034c2c9647f44b1cf70d019f70 /drivers/pci | |
| parent | c80c7798cfc6032ce6522aded6048f1d3fe93fce (diff) | |
dm: pci: Add APIs to find next capability and extended capability
This introduces two new APIs dm_pci_find_next_capability() and
dm_pci_find_next_ext_capability() to get PCI capability address
and PCI express extended capability address for a given PCI device
starting from a given offset.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/pci-uclass.c | 51 |
1 files changed, 36 insertions, 15 deletions
diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c index da49c96ed5..0c52337f33 100644 --- a/drivers/pci/pci-uclass.c +++ b/drivers/pci/pci-uclass.c @@ -1344,26 +1344,14 @@ void *dm_pci_map_bar(struct udevice *dev, int bar, int flags) return dm_pci_bus_to_virt(dev, pci_bus_addr, flags, 0, MAP_NOCACHE); } -int dm_pci_find_capability(struct udevice *dev, int cap) +static int _dm_pci_find_next_capability(struct udevice *dev, u8 pos, int cap) { - u16 status; - u8 header_type; int ttl = PCI_FIND_CAP_TTL; u8 id; u16 ent; - u8 pos; - - dm_pci_read_config16(dev, PCI_STATUS, &status); - if (!(status & PCI_STATUS_CAP_LIST)) - return 0; - - dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type); - if ((header_type & 0x7f) == PCI_HEADER_TYPE_CARDBUS) - pos = PCI_CB_CAPABILITY_LIST; - else - pos = PCI_CAPABILITY_LIST; dm_pci_read_config8(dev, pos, &pos); + while (ttl--) { if (pos < PCI_STD_HEADER_SIZEOF) break; @@ -1381,7 +1369,32 @@ int dm_pci_find_capability(struct udevice *dev, int cap) return 0; } -int dm_pci_find_ext_capability(struct udevice *dev, int cap) +int dm_pci_find_next_capability(struct udevice *dev, u8 start, int cap) +{ + return _dm_pci_find_next_capability(dev, start + PCI_CAP_LIST_NEXT, + cap); +} + +int dm_pci_find_capability(struct udevice *dev, int cap) +{ + u16 status; + u8 header_type; + u8 pos; + + dm_pci_read_config16(dev, PCI_STATUS, &status); + if (!(status & PCI_STATUS_CAP_LIST)) + return 0; + + dm_pci_read_config8(dev, PCI_HEADER_TYPE, &header_type); + if ((header_type & 0x7f) == PCI_HEADER_TYPE_CARDBUS) + pos = PCI_CB_CAPABILITY_LIST; + else + pos = PCI_CAPABILITY_LIST; + + return _dm_pci_find_next_capability(dev, pos, cap); +} + +int dm_pci_find_next_ext_capability(struct udevice *dev, int start, int cap) { u32 header; int ttl; @@ -1390,6 +1403,9 @@ int dm_pci_find_ext_capability(struct udevice *dev, int cap) /* minimum 8 bytes per capability */ ttl = (PCI_CFG_SPACE_EXP_SIZE - PCI_CFG_SPACE_SIZE) / 8; + if (start) + pos = start; + dm_pci_read_config32(dev, pos, &header); /* * If we have no capabilities, this is indicated by cap ID, @@ -1412,6 +1428,11 @@ int dm_pci_find_ext_capability(struct udevice *dev, int cap) return 0; } +int dm_pci_find_ext_capability(struct udevice *dev, int cap) +{ + return dm_pci_find_next_ext_capability(dev, 0, cap); +} + UCLASS_DRIVER(pci) = { .id = UCLASS_PCI, .name = "pci", |