diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2006-11-22 18:26:18 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2006-12-20 10:54:42 -0800 |
| commit | 687d5fe3dc33794efb500f42164a0588e2647914 (patch) | |
| tree | 9d344d790ae2e9d6214c2b2941360e5c0ef97f7b /include | |
| parent | d3bac118fb27a365d5e9f54f4a078eb9b42f968f (diff) | |
PCI: Add pci_find_ht_capability() for finding Hypertransport capabilities
There are already several places in the kernel that want to search a PCI
device for a given Hypertransport capability. Although this is possible
using pci_find_capability() etc., it makes sense to encapsulate that
logic in a helper - pci_find_ht_capability().
To cater for searching exhaustively for a capability, we also provide
pci_find_next_ht_capability().
We also need to cater for the fact that the HT capability fields may be
either 3 or 5 bits wide. pci_find_ht_capability() deals with this for you,
but callers using the #defines directly must handle that themselves.
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/pci.h | 2 | ||||
| -rw-r--r-- | include/linux/pci_regs.h | 12 |
2 files changed, 13 insertions, 1 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 769e132b78d..b20ffb65300 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -454,6 +454,8 @@ struct pci_dev *pci_find_slot (unsigned int bus, unsigned int devfn); int pci_find_capability (struct pci_dev *dev, int cap); int pci_find_next_capability (struct pci_dev *dev, u8 pos, int cap); int pci_find_ext_capability (struct pci_dev *dev, int cap); +int pci_find_ht_capability (struct pci_dev *dev, int ht_cap); +int pci_find_next_ht_capability (struct pci_dev *dev, int pos, int ht_cap); struct pci_bus *pci_find_next_bus(const struct pci_bus *from); struct pci_dev *pci_get_device(unsigned int vendor, unsigned int device, diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h index 064b1dc71c2..a54b48f7cee 100644 --- a/include/linux/pci_regs.h +++ b/include/linux/pci_regs.h @@ -475,9 +475,19 @@ #define PCI_PWR_CAP 12 /* Capability */ #define PCI_PWR_CAP_BUDGET(x) ((x) & 1) /* Included in system budget */ -/* Hypertransport sub capability types */ +/* + * Hypertransport sub capability types + * + * Unfortunately there are both 3 bit and 5 bit capability types defined + * in the HT spec, catering for that is a little messy. You probably don't + * want to use these directly, just use pci_find_ht_capability() and it + * will do the right thing for you. + */ +#define HT_3BIT_CAP_MASK 0xE0 #define HT_CAPTYPE_SLAVE 0x00 /* Slave/Primary link configuration */ #define HT_CAPTYPE_HOST 0x20 /* Host/Secondary link configuration */ + +#define HT_5BIT_CAP_MASK 0xF8 #define HT_CAPTYPE_IRQ 0x80 /* IRQ Configuration */ #define HT_CAPTYPE_REMAPPING_40 0xA0 /* 40 bit address remapping */ #define HT_CAPTYPE_REMAPPING_64 0xA2 /* 64 bit address remapping */ |