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Diffstat (limited to 'src/dev/arm/FlashDevice.py')
| -rw-r--r-- | src/dev/arm/FlashDevice.py | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/dev/arm/FlashDevice.py b/src/dev/arm/FlashDevice.py new file mode 100644 index 000000000..ed3b9d04d --- /dev/null +++ b/src/dev/arm/FlashDevice.py @@ -0,0 +1,74 @@ +# Copyright (c) 2013-2015 ARM Limited +# All rights reserved. +# +# The license below extends only to copyright in the software and shall +# not be construed as granting a license to any other intellectual +# property including but not limited to intellectual property relating +# to a hardware implementation of the functionality of the software +# licensed hereunder. You may use the software subject to the license +# terms below provided that you ensure that this notice is replicated +# unmodified and in its entirety in all distributions of the software, +# modified or unmodified, in source code or in binary form. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are +# met: redistributions of source code must retain the above copyright +# notice, this list of conditions and the following disclaimer; +# redistributions in binary form must reproduce the above copyright +# notice, this list of conditions and the following disclaimer in the +# documentation and/or other materials provided with the distribution; +# neither the name of the copyright holders nor the names of its +# contributors may be used to endorse or promote products derived from +# this software without specific prior written permission. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +# +# Authors: Rene de Jong +# + +from m5.params import * +from m5.proxy import * +from AbstractNVM import * + +#Distribution of the data. +#sequential: sequential (address n+1 is likely to be on the same plane as n) +#Random: @TODO Not yet implemented +#stripe: striping over all the planes +class DataDistribution(Enum): vals = ['sequential', 'stripe'] + +class FlashDevice(AbstractNVM): + type = 'FlashDevice' + cxx_header = "dev/arm/flash_device.hh" + # default blocksize is 128 kB.This seems to be the most common size in + # mobile devices (not the image blocksize) + blk_size = Param.MemorySize("128kB", "Size of one disk block") + # disk page size is 2 kB. This is the most commonly used page size in + # flash devices + page_size = Param.MemorySize("2kB", "Size of one disk page") + # There are many GC flavours. It is impossible to cover them all; this + # parameter enables the approximation of different GC algorithms + GC_active = Param.Percent(50, "Percentage of the time (in whole numbers) \ + that the GC is activated if a block is full") + # Access latencies. Different devices will have different latencies, but + # the latencies will be around the default values. + read_lat = Param.Latency("25us", "Read Latency") + write_lat = Param.Latency("200us", "Write Latency") + erase_lat = Param.Latency("1500us", "Erase Delay") + # Number of planes ought to be a power of two according to ONFI standard + num_planes = Param.UInt32(1, "Number of planes per die") + # Data distribution. Default is none. It is adviced to switch to stripe + # when more than one plane is used. + data_distribution = Param.DataDistribution('sequential', "Distribution \ + of the data in the adress table; Stripe needed for multiple\ + planes; otherwise use: sequential") + |