Add c2 port support
C2port 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 through sysfs interface but extensions shoud be easy to add. Signed-off-by: Rodolfo Giometti <giometti@linux.it> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rodolfo Giometti
Linus Torvalds
parent
e0a29382c6
commit
4e17e1db96
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What: /sys/class/c2port/
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/ directory will contain files and
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directories that will provide a unified interface to
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the C2 port interface.
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What: /sys/class/c2port/c2portX
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/ directory is related to X-th
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C2 port into the system. Each directory will contain files to
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manage and control its C2 port.
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What: /sys/class/c2port/c2portX/access
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/access file enable the access
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to the C2 port from the system. No commands can be sent
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till this entry is set to 0.
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What: /sys/class/c2port/c2portX/dev_id
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/dev_id file show the device ID
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of the connected micro.
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What: /sys/class/c2port/c2portX/flash_access
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_access file enable the
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access to the on-board flash of the connected micro.
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No commands can be sent till this entry is set to 0.
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What: /sys/class/c2port/c2portX/flash_block_size
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_block_size file show
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the on-board flash block size of the connected micro.
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What: /sys/class/c2port/c2portX/flash_blocks_num
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_blocks_num file show
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the on-board flash blocks number of the connected micro.
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What: /sys/class/c2port/c2portX/flash_data
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_data file export
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the content of the on-board flash of the connected micro.
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What: /sys/class/c2port/c2portX/flash_erase
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_erase file execute
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the "erase" command on the on-board flash of the connected
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micro.
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What: /sys/class/c2port/c2portX/flash_erase
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/flash_erase file show the
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on-board flash size of the connected micro.
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What: /sys/class/c2port/c2portX/reset
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/reset file execute a "reset"
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command on the connected micro.
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What: /sys/class/c2port/c2portX/rev_id
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Date: October 2008
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Contact: Rodolfo Giometti <giometti@linux.it>
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Description:
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The /sys/class/c2port/c2portX/rev_id file show the revision ID
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of the connected micro.
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@ -0,0 +1,90 @@
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C2 port support
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---------------
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(C) Copyright 2007 Rodolfo Giometti <giometti@enneenne.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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Overview
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--------
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This driver implements the support for Linux of Silicon Labs (Silabs)
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C2 Interface used for in-system programming of micro controllers.
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By using this driver you can reprogram the in-system flash without EC2
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or EC3 debug adapter. This solution is also useful in those systems
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where the micro controller is connected via special GPIOs pins.
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References
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----------
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The C2 Interface main references are at (http://www.silabs.com)
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Silicon Laboratories site], see:
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- AN127: FLASH Programming via the C2 Interface at
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http://www.silabs.com/public/documents/tpub_doc/anote/Microcontrollers/Small_Form_Factor/en/an127.pdf, and
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- C2 Specification at
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http://www.silabs.com/public/documents/tpub_doc/spec/Microcontrollers/en/C2spec.pdf,
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however it implements a two wire serial communication protocol (bit
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banging) designed to enable in-system programming, debugging, and
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boundary-scan testing on low pin-count Silicon Labs devices. Currently
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this code supports only flash programming but extensions are easy to
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add.
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Using the driver
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----------------
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Once the driver is loaded you can use sysfs support to get C2port's
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info or read/write in-system flash.
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# ls /sys/class/c2port/c2port0/
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access flash_block_size flash_erase rev_id
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dev_id flash_blocks_num flash_size subsystem/
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flash_access flash_data reset uevent
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Initially the C2port access is disabled since you hardware may have
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such lines multiplexed with other devices so, to get access to the
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C2port, you need the command:
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# echo 1 > /sys/class/c2port/c2port0/access
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after that you should read the device ID and revision ID of the
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connected micro controller:
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# cat /sys/class/c2port/c2port0/dev_id
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8
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# cat /sys/class/c2port/c2port0/rev_id
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1
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However, for security reasons, the in-system flash access in not
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enabled yet, to do so you need the command:
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# echo 1 > /sys/class/c2port/c2port0/flash_access
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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
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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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@ -498,4 +498,6 @@ config SGI_GRU_DEBUG
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This option enables addition debugging code for the SGI GRU driver. If
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you are unsure, say N.
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source "drivers/misc/c2port/Kconfig"
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endif # MISC_DEVICES
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@ -32,3 +32,4 @@ obj-$(CONFIG_KGDB_TESTS) += kgdbts.o
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obj-$(CONFIG_SGI_XP) += sgi-xp/
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obj-$(CONFIG_SGI_GRU) += sgi-gru/
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obj-$(CONFIG_HP_ILO) += hpilo.o
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obj-$(CONFIG_C2PORT) += c2port/
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@ -0,0 +1,24 @@
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#
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# C2 port devices
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#
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menuconfig C2PORT
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tristate "Silicon Labs C2 port support (EXPERIMENTAL)"
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depends on EXPERIMENTAL
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default no
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help
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This option enables support for Silicon Labs C2 port used to
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program Silicon micro controller chips (and other 8051 compatible).
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If your board have no such micro controllers you don't need this
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interface at all.
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To compile this driver as a module, choose M here: the module will
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be called c2port_core. Note that you also need a client module
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usually called c2port-*.
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If you are not sure, say N here.
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if C2PORT
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endif # C2PORT
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obj-$(CONFIG_C2PORT) += core.o
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,65 @@
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/*
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* Silicon Labs C2 port Linux support
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*
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* Copyright (c) 2007 Rodolfo Giometti <giometti@linux.it>
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* Copyright (c) 2007 Eurotech S.p.A. <info@eurotech.it>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation
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*/
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#include <linux/device.h>
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#define C2PORT_NAME_LEN 32
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/*
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* C2 port basic structs
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*/
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/* Main struct */
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struct c2port_ops;
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struct c2port_device {
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unsigned int access:1;
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unsigned int flash_access:1;
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int id;
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char name[C2PORT_NAME_LEN];
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struct c2port_ops *ops;
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struct mutex mutex; /* prevent races during read/write */
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struct device *dev;
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void *private_data;
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};
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/* Basic operations */
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struct c2port_ops {
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/* Flash layout */
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unsigned short block_size; /* flash block size in bytes */
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unsigned short blocks_num; /* flash blocks number */
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/* Enable or disable the access to C2 port */
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void (*access)(struct c2port_device *dev, int status);
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/* Set C2D data line as input/output */
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void (*c2d_dir)(struct c2port_device *dev, int dir);
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/* Read/write C2D data line */
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int (*c2d_get)(struct c2port_device *dev);
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void (*c2d_set)(struct c2port_device *dev, int status);
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/* Write C2CK clock line */
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void (*c2ck_set)(struct c2port_device *dev, int status);
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};
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/*
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* Exported functions
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*/
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#define to_class_dev(obj) container_of((obj), struct class_device, kobj)
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#define to_c2port_device(obj) container_of((obj), struct c2port_device, class)
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extern struct c2port_device *c2port_device_register(char *name,
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struct c2port_ops *ops, void *devdata);
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extern void c2port_device_unregister(struct c2port_device *dev);
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