projects / linux-block.git / blame
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|---|---|---|
| 48ed8877 PM |
1 | Kernel driver vexpress |
| 2 | ====================== | |
| 3 | ||
| 4 | Supported systems: | |
| a449dff6 | 5 | |
| 48ed8877 | 6 | * ARM Ltd. Versatile Express platform |
| a449dff6 | 7 | |
| 48ed8877 | 8 | Prefix: 'vexpress' |
| a449dff6 | 9 | |
| 48ed8877 | 10 | Datasheets: |
| a449dff6 | 11 | |
| 48ed8877 | 12 | * "Hardware Description" sections of the Technical Reference Manuals |
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13 | for the Versatile Express boards: |
| 14 | ||
| 15 | - http://infocenter.arm.com/help/topic/com.arm.doc.subset.boards.express/index.html | |
| 16 | ||
| 48ed8877 | 17 | * Section "4.4.14. System Configuration registers" of the V2M-P1 TRM: |
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18 | |
| 19 | - http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0447-/index.html | |
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20 | |
| 21 | Author: Pawel Moll | |
| 22 | ||
| 23 | Description | |
| 24 | ----------- | |
| 25 | ||
| 26 | Versatile Express platform (http://www.arm.com/versatileexpress/) is a | |
| 27 | reference & prototyping system for ARM Ltd. processors. It can be set up | |
| 28 | from a wide range of boards, each of them containing (apart of the main | |
| 29 | chip/FPGA) a number of microcontrollers responsible for platform | |
| 12087a36 | 30 | configuration and control. These microcontrollers can also monitor the |
| 48ed8877 PM |
31 | board and its environment by a number of internal and external sensors, |
| 32 | providing information about power lines voltages and currents, board | |
| 33 | temperature and power usage. Some of them also calculate consumed energy | |
| 34 | and provide a cumulative use counter. | |
| 35 | ||
| 36 | The configuration devices are _not_ memory mapped and must be accessed | |
| 37 | via a custom interface, abstracted by the "vexpress_config" API. | |
| 38 | ||
| 39 | As these devices are non-discoverable, they must be described in a Device | |
| 40 | Tree passed to the kernel. Details of the DT binding for them can be found | |
| 41 | in Documentation/devicetree/bindings/hwmon/vexpress.txt. |