diff options
Diffstat (limited to 'include/linux/amba/bus.h')
| -rw-r--r-- | include/linux/amba/bus.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/linux/amba/bus.h b/include/linux/amba/bus.h index d143c13bed26..e3c36223e40b 100644 --- a/include/linux/amba/bus.h +++ b/include/linux/amba/bus.h @@ -25,6 +25,39 @@ #define AMBA_CID 0xb105f00d #define CORESIGHT_CID 0xb105900d +/* + * CoreSight Architecture specification updates the ID specification + * for components on the AMBA bus. (ARM IHI 0029E) + * + * Bits 15:12 of the CID are the device class. + * + * Class 0xF remains for PrimeCell and legacy components. (AMBA_CID above) + * Class 0x9 defines the component as CoreSight (CORESIGHT_CID above) + * Class 0x0, 0x1, 0xB, 0xE define components that do not have driver support + * at present. + * Class 0x2-0x8,0xA and 0xD-0xD are presently reserved. + * + * Remaining CID bits stay as 0xb105-00d + */ + +/** + * Class 0x9 components use additional values to form a Unique Component + * Identifier (UCI), where peripheral ID values are identical for different + * components. Passed to the amba bus code from the component driver via + * the amba_id->data pointer. + * @devarch : coresight devarch register value + * @devarch_mask: mask bits used for matching. 0 indicates UCI not used. + * @devtype : coresight device type value + * @data : additional driver data. As we have usurped the original + * pointer some devices may still need additional data + */ +struct amba_cs_uci_id { + unsigned int devarch; + unsigned int devarch_mask; + unsigned int devtype; + void *data; +}; + struct clk; struct amba_device { |