308 lines
7.3 KiB
Python
308 lines
7.3 KiB
Python
#!/usr/bin/python
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# Python library for in-band SCom access
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# (based on xscom-utils from OPAL firmware)
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#
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# Copyright 2018 IBM Corp.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import os, sys, struct, getopt
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class XSCom(object):
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def __init__(self):
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self.name = "xscom"
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self.base = "/sys/kernel/debug/powerpc/scom/"
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self.enabled = False
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self.setup = False
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self.chips = []
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self.dirs = []
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self.key_val_bin = {}
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self.file = "/access"
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if os.path.exists(self.base):
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self.enabled = True
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if not self.scan_chips():
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raise ValueError
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def scan_chips(self):
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if not self.enabled:
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print("Not supported")
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return False
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for i in os.listdir(self.base):
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if os.path.isdir(self.base+i):
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self.dirs.append(i)
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self.chips.append(int(i,16))
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for i in self.dirs:
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try:
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b = open(self.base+i+self.file, "rb+")
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self.key_val_bin[int(i,16)] = b
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except:
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print("Count not open"+self.base+i+self.file)
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return False
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self.setup = True
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return True
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def is_supported(self):
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return self.enabled
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def get_chip_ids(self):
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return list(self.key_val_bin.keys())
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def mangle_addr(self, addr):
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tmp = (addr & 0xf000000000000000) >> 4
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addr = (addr & 0x00ffffffffffffff)
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addr = addr | tmp
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return (addr << 3)
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def xscom_read(self, chip_id, addr):
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if not isinstance(chip_id, int) or not isinstance(addr, int):
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print("xscom_read: Input paramater type mismatch")
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return -1
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if chip_id not in self.key_val_bin:
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print("Invalid Chip id")
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return -1
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saddr = self.mangle_addr(addr)
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fd = self.key_val_bin.get(chip_id)
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fd.seek(saddr, 0)
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return struct.unpack('Q',fd.read(8))[0]
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def xscom_read_spl(self, chip_id, addr):
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if not isinstance(chip_id, int) or not isinstance(addr, int):
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print("xscom_read: Input paramater type mismatch")
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return -1
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if chip_id not in self.key_val_bin:
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print("Invalid Chip id")
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return -1
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saddr = self.mangle_addr(addr)
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fd = self.key_val_bin.get(chip_id)
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fd.seek(saddr, 0)
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val = struct.unpack('Q',fd.read(8))[0]
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fd.close()
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try:
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b = open(self.key_val_path.get(chip_id), "rb+")
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except:
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print("Reopen failed")
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return val
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self.key_val_bin[chip_id] = b
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return val
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def xscom_write(self, chip_id, addr, val):
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if chip_id not in self.key_val_bin:
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print("Invalid Chip id")
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return -1
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c = struct.pack('Q',val)
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saddr = self.mangle_addr(addr)
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fd = self.key_val_bin.get(chip_id)
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try:
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fd.seek(saddr, 0)
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fd.write(c)
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# write again just to be sure
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fd.seek(saddr, 0)
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fd.write(c)
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except:
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print("Write() error")
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return -1
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def xscom_read_ex(self, ex_target_id, addr):
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if not isinstance(ex_target_id, int) or not isinstance(addr, int):
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print("xscom_read_ex: Input paramater type mismatch")
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return -1
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chip_id = ex_target_id >> 4
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addr |= (ex_target_id & 0xf) << 24;
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return self.xscom_read(chip_id, addr, val);
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def xscom_write_ex(self, ex_target_id, addr, val):
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chip_id = ex_target_id >> 4
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addr |= (ex_target_id & 0xf) << 24;
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return self.xscom_write(chip_id, addr, val)
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class GetSCom(object):
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def __init__(self):
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self.name = "getscom"
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self.backend = XSCom()
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self.listchip = False
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self.chip_id = 0
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self.chips = False
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self.addr = 0
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self.flg_addr = False
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if not self.backend.is_supported():
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print("In-Band SCom not supported Exiting....")
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raise ValueError
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def set_chip(self, chip_id):
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self.chip_id = chip_id
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self.chips = True
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def set_addr(self, scom_addr):
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self.addr = scom_addr
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self.flg_addr = True
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def print_usage(self):
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print("usage: getscom [-c|--chip chip-id] addr")
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print(" getscom -l|--list-chips")
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print(" getscom -h|--help")
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sys.exit(0)
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def chip_info(self, chip_id):
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val = self.backend.xscom_read(chip_id, 0xf000f)
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if val < 0:
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print("Error in scom read")
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raise ValueError
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c_id = val >> 44
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id = c_id & 0xff
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if id == 0xef:
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name = "P8E (Murano) processor"
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elif id == 0xea:
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name = "P8 (Venice) processor"
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elif id == 0xd3:
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name = "P8NVL (Naples) processor"
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elif id == 0xd1:
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name = "P9 (Nimbus) processor"
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elif id == 0xd4:
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name = "P9 (Cumulus) processor"
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elif id == 0xe9:
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name = "Centaur memory buffer"
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else:
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name = "Unknown ID 0x%x"%id
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print(("%08x | DD%s.%s | %s"%(chip_id, ((c_id >> 16) & 0xf), ((c_id >> 8) & 0xf), name)))
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def parse_args(self):
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try:
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optlist, sys.argv = getopt.getopt(sys.argv[1:], "lhc:", ["chip", "list-chips", "help"])
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except getopt.GetoptError as err:
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print(str(err))
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self.print_usage()
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sys.exit(0)
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if len(optlist) == 0:
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self.print_usage()
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sys.exit(0)
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for opt, arg in optlist:
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if opt in [ "-h", "--help"]:
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self.print_usage()
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sys.exit(0)
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elif opt in [ "-l", "--list-chips"]:
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self.listchip = True
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elif opt in ["-c", "--chip"]:
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self.chip_id = int(arg, 16)
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self.chips = True
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if sys.argv:
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self.addr = int(sys.argv.pop(), 16)
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self.flg_addr = True
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if self.listchip:
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print("Chip ID | Rev | Chip type")
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print("---------|-------|-----------")
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for i in self.backend.get_chip_ids():
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self.chip_info(i)
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sys.exit(0)
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def run_command(self):
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if self.chips and self.flg_addr:
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print(hex(self.backend.xscom_read(self.chip_id, self.addr)))
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def list_chips(self):
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print("Chip ID | Rev | Chip type")
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print("---------|-------|-----------")
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for i in self.backend.get_chip_ids():
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self.chip_info(i)
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raise ValueError
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def execute(self, chip_id, addr):
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return self.backend.xscom_read(chip_id, addr)
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def execute_spl(self, chip_id, addr):
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return self.backend.xscom_read_spl(chip_id, addr)
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class PutSCom(object):
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def __init__(self):
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self.name = "putscom"
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self.backend = XSCom()
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self.chip_id = 0
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self.chips = False
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self.addr = 0
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self.value = 0
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if not self.backend.is_supported():
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print("In-Band SCom not supported Exiting....")
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raise ValueError
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def set_addr(self, addr):
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self.addr = addr
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def set_value(self, value):
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self.value = value
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def print_usage(self):
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print("usage: putscom [-c|--chip chip-id] addr value")
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print(" putscom -h|--help")
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sys.exit(0)
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def parse_args(self):
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try:
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optlist, sys.argv = getopt.getopt(sys.argv[1:], "hc:", ["chip", "help"])
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except getopt.GetoptError as err:
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print(str(err))
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self.print_usage()
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sys.exit(0)
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if len(optlist) == 0:
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self.print_usage()
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sys.exit(0)
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for opt, arg in optlist:
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if opt in [ "-h", "--help"]:
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self.print_usage()
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sys.exit(0)
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elif opt in ["-c", "--chip"]:
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self.chip_id = int(arg, 16)
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self.chips = True
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if sys.argv:
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self.value = int(sys.argv.pop(), 16)
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self.addr = int(sys.argv.pop(), 16)
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if self.chips:
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self.backend.xscom_write(self.chip_id, self.addr, self.value)
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def run_command(self):
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if self.chips:
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self.backend.xscom_write(self.chip_id, self.addr, self.value)
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def execute(self, chip_id, addr, value):
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self.backend.xscom_write(chip_id, addr, value)
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