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Linus Torvalds
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| --- | ||
| refs/heads/master: 604d20554883cf03f888440d58ea7c6d36899839 | ||
| refs/heads/master: 3108864e2d70891d30d60af6af256a1b517d7078 |
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| What: /sys/class/c2port/ | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/ directory will contain files and | ||
| directories that will provide a unified interface to | ||
| the C2 port interface. | ||
|
|
||
| What: /sys/class/c2port/c2portX | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/ directory is related to X-th | ||
| C2 port into the system. Each directory will contain files to | ||
| manage and control its C2 port. | ||
|
|
||
| What: /sys/class/c2port/c2portX/access | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/access file enable the access | ||
| to the C2 port from the system. No commands can be sent | ||
| till this entry is set to 0. | ||
|
|
||
| What: /sys/class/c2port/c2portX/dev_id | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/dev_id file show the device ID | ||
| of the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_access | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_access file enable the | ||
| access to the on-board flash of the connected micro. | ||
| No commands can be sent till this entry is set to 0. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_block_size | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_block_size file show | ||
| the on-board flash block size of the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_blocks_num | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_blocks_num file show | ||
| the on-board flash blocks number of the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_data | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_data file export | ||
| the content of the on-board flash of the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_erase | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_erase file execute | ||
| the "erase" command on the on-board flash of the connected | ||
| micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/flash_erase | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/flash_erase file show the | ||
| on-board flash size of the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/reset | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/reset file execute a "reset" | ||
| command on the connected micro. | ||
|
|
||
| What: /sys/class/c2port/c2portX/rev_id | ||
| Date: October 2008 | ||
| Contact: Rodolfo Giometti <giometti@linux.it> | ||
| Description: | ||
| The /sys/class/c2port/c2portX/rev_id file show the revision ID | ||
| of the connected micro. |
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| 00-INDEX | ||
| - this file | ||
| README.DAC960 | ||
| - info on Mylex DAC960/DAC1100 PCI RAID Controller Driver for Linux. | ||
| cciss.txt | ||
| - info, major/minor #'s for Compaq's SMART Array Controllers. | ||
| cpqarray.txt | ||
| - info on using Compaq's SMART2 Intelligent Disk Array Controllers. | ||
| floppy.txt | ||
| - notes and driver options for the floppy disk driver. | ||
| nbd.txt | ||
| - info on a TCP implementation of a network block device. | ||
| paride.txt | ||
| - information about the parallel port IDE subsystem. | ||
| ramdisk.txt | ||
| - short guide on how to set up and use the RAM disk. |
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| C2 port support | ||
| --------------- | ||
|
|
||
| (C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com> | ||
|
|
||
| This program is free software; you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation; either version 2 of the License, or | ||
| (at your option) any later version. | ||
|
|
||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
|
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||
|
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||
|
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||
| Overview | ||
| -------- | ||
|
|
||
| This driver implements the support for Linux of Silicon Labs (Silabs) | ||
| C2 Interface used for in-system programming of micro controllers. | ||
|
|
||
| By using this driver you can reprogram the in-system flash without EC2 | ||
| or EC3 debug adapter. This solution is also useful in those systems | ||
| where the micro controller is connected via special GPIOs pins. | ||
|
|
||
| References | ||
| ---------- | ||
|
|
||
| The C2 Interface main references are at (http://www.silabs.com) | ||
| Silicon Laboratories site], see: | ||
|
|
||
| - AN127: FLASH Programming via the C2 Interface at | ||
| http://www.silabs.com/public/documents/tpub_doc/anote/Microcontrollers/Small_Form_Factor/en/an127.pdf, and | ||
|
|
||
| - C2 Specification at | ||
| http://www.silabs.com/public/documents/tpub_doc/spec/Microcontrollers/en/C2spec.pdf, | ||
|
|
||
| however it implements a two wire serial communication protocol (bit | ||
| banging) designed to enable in-system programming, debugging, and | ||
| boundary-scan testing on low pin-count Silicon Labs devices. Currently | ||
| this code supports only flash programming but extensions are easy to | ||
| add. | ||
|
|
||
| Using the driver | ||
| ---------------- | ||
|
|
||
| Once the driver is loaded you can use sysfs support to get C2port's | ||
| info or read/write in-system flash. | ||
|
|
||
| # ls /sys/class/c2port/c2port0/ | ||
| access flash_block_size flash_erase rev_id | ||
| dev_id flash_blocks_num flash_size subsystem/ | ||
| flash_access flash_data reset uevent | ||
|
|
||
| Initially the C2port access is disabled since you hardware may have | ||
| such lines multiplexed with other devices so, to get access to the | ||
| C2port, you need the command: | ||
|
|
||
| # echo 1 > /sys/class/c2port/c2port0/access | ||
|
|
||
| after that you should read the device ID and revision ID of the | ||
| connected micro controller: | ||
|
|
||
| # cat /sys/class/c2port/c2port0/dev_id | ||
| 8 | ||
| # cat /sys/class/c2port/c2port0/rev_id | ||
| 1 | ||
|
|
||
| However, for security reasons, the in-system flash access in not | ||
| enabled yet, to do so you need the command: | ||
|
|
||
| # echo 1 > /sys/class/c2port/c2port0/flash_access | ||
|
|
||
| After that you can read the whole flash: | ||
|
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| # cat /sys/class/c2port/c2port0/flash_data > image | ||
|
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| erase it: | ||
|
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| # echo 1 > /sys/class/c2port/c2port0/flash_erase | ||
|
|
||
| and write it: | ||
|
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| # cat image > /sys/class/c2port/c2port0/flash_data | ||
|
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| after writing you have to reset the device to execute the new code: | ||
|
|
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| # echo 1 > /sys/class/c2port/c2port0/reset |
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