sonic-buildimage/platform/broadcom/sonic-platform-modules-dell/s5232f/scripts/pcisysfs.py

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#!/usr/bin/python
# Copyright (c) 2015 Dell Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
#
# THIS CODE IS PROVIDED ON AN *AS IS* BASIS, WITHOUT WARRANTIES OR
# CONDITIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT
# LIMITATION ANY IMPLIED WARRANTIES OR CONDITIONS OF TITLE, FITNESS
# FOR A PARTICULAR PURPOSE, MERCHANTABLITY OR NON-INFRINGEMENT.
#
# See the Apache Version 2.0 License for specific language governing
# permissions and limitations under the License.
import struct
import sys
import getopt
from os import *
from mmap import *
def usage():
''' This is the Usage Method '''
print '\t\t pcisysfs.py --get --offset <offset> --res <resource>'
print '\t\t pcisysfs.py --set --val <val> --offset <offset> --res <resource>'
sys.exit(1)
def pci_mem_read(mm,offset):
mm.seek(offset)
read_data_stream=mm.read(4)
print ""
reg_val=struct.unpack('I',read_data_stream)
print "reg_val read:%x"%reg_val
return reg_val
def pci_mem_write(mm,offset,data):
mm.seek(offset)
print "data to write:%x"%data
mm.write(struct.pack('I',data))
def pci_set_value(resource,val,offset):
fd=open(resource,O_RDWR)
mm=mmap(fd,0)
pci_mem_write(mm,offset,val)
def pci_get_value(resource,offset):
fd=open(resource,O_RDWR)
mm=mmap(fd,0)
pci_mem_read(mm,offset)
def main(argv):
''' The main function will read the user input from the
command line argument and process the request '''
opts = ''
val = ''
choice = ''
resource = ''
offset = ''
try:
opts, args = getopt.getopt(argv, "hgsv:" , \
["val=","res=","offset=","help", "get", "set"])
except getopt.GetoptError:
usage()
for opt,arg in opts:
if opt in ('-h','--help'):
choice = 'help'
elif opt in ('-g', '--get'):
choice = 'get'
elif opt in ('-s', '--set'):
choice = 'set'
elif opt == '--res':
resource = arg
elif opt == '--val':
val = int(arg,16)
elif opt == '--offset':
offset = int(arg,16)
if choice == 'set' and val != '' and offset !='' and resource !='':
pci_set_value(resource,val,offset)
elif choice == 'get' and offset != '' and resource !='':
pci_get_value(resource,offset)
else:
usage()
#Calling the main method
if __name__ == "__main__":
main(sys.argv[1:])