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The CoreSight specification (ARM IHI 0029E), updates the ID register requirements for components on an AMBA bus, to cover both traditional ARM Primecell type devices, and newer CoreSight and other components. The Peripheral ID (PID) / Component ID (CID) pair is extended in certain cases to uniquely identify components. CoreSight components related to a single function can share Peripheral ID values, and must be further identified using a Unique Component Identifier (UCI). e.g. the ETM, CTI, PMU and Debug hardware of the A35 all share the same PID. Bits 15:12 of the CID are defined to be the device class. Class 0xF remains for PrimeCell and legacy components. 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. The specification futher defines which classes of device use the standard CID/PID pair, and when additional ID registers are required. This patch introduces the amba_cs_uci_id structure which will be used in all coresight drivers for indentification via the private data pointer in the amba_id structure. Existing drivers that currently use the amba_id->data pointer for private data are updated to use the amba_cs_uci_id->data pointer. Macros and inline functions are added to simplify this code. Signed-off-by: Mike Leach <mike.leach@linaro.org> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Tested-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.