Add Python script to produce the dt values

scripts/deps.sh

@@ -21,6 +21,7 @@ if [[ "${ID}" =~ "debian" ]] || [[ "${ID_LIKE}" =~ "debian" ]]; then
     ccache \
     cmake \
     curl \
+    devmem2 \
     dosfstools \
     flashrom \
     flex \
@@ -29,6 +30,7 @@ if [[ "${ID}" =~ "debian" ]] || [[ "${ID_LIKE}" =~ "debian" ]]; then
     gnat \
     libncurses-dev \
     libudev-dev \
+    msr-tools \
     mtools \
     nasm \
     parted \
@@ -51,6 +53,7 @@ elif [[ "${ID}" =~ "fedora" ]] || [[ "${ID_LIKE}" =~ "fedora" ]]; then
     gcc-gnat \
     git-lfs \
     libuuid-devel \
+    msr-tools \
     mtools \
     nasm \
     ncurses-devel \

scripts/devicetree.py

@@ -0,0 +1,75 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: GPL-3.0-only
+
+import os
+import subprocess
+import sys
+
+
+def power_limits():
+    pl1 = int(subprocess.check_output("cat /sys/class/powercap/intel-rapl:0/constraint_0_power_limit_uw", shell=True))
+    pl2 = int(subprocess.check_output("cat /sys/class/powercap/intel-rapl:0/constraint_1_power_limit_uw", shell=True))
+    # Convert from microwatts to watts
+    return pl1 // 1_000_000, pl2 // 1_000_000
+
+def thermal():
+    subprocess.check_call("modprobe msr", shell=True)
+    return int(subprocess.check_output("rdmsr --bitfield 31:24 --decimal 0x1A2", shell=True))
+
+def pch_pm_slp():
+    gen_pmcon_a = int(subprocess.check_output("devmem2 0xfe001020", shell=True).split()[-1], 16)
+    pm_cfg = int(subprocess.check_output("devmem2 0xfe001818", shell=True).split()[-1], 16)
+
+    s3min = (gen_pmcon_a >> 10) & 0b11
+    s4min = (gen_pmcon_a >> 4) & 0b11
+    susmin = (pm_cfg >> 18) & 0b11
+    amin = (pm_cfg >> 16) & 0b11
+    return s3min, s4min, susmin, amin
+
+def lpc():
+    dump = subprocess.check_output("lspci -s 1f.0 -xxx", shell=True).decode("utf-8")
+    extract = []
+    for l in dump.split('\n'):
+        if l.startswith("80") or l.startswith("90"):
+            extract += l.split()[1:]
+
+    # Values are displayed in little endian
+    gen1 = int("0x" + "".join(extract[7:3:-1]), 16)
+    gen2 = int("0x" + "".join(extract[11:7:-1]), 16)
+    gen3 = int("0x" + "".join(extract[15:11:-1]), 16)
+    gen4 = int("0x" + "".join(extract[19:15:-1]), 16)
+    return gen1, gen2, gen3, gen4
+
+
+if __name__ == '__main__':
+    if os.geteuid() != 0:
+        sys.exit("Must run as root")
+
+    pl1, pl2 = power_limits()
+    print("""\t# Power limits
+\tregister "power_limits_config" = "{{
+\t\t.tdp_pl1_override = {},
+\t\t.tdp_pl2_override = {},
+\t}}"
+""".format(pl1, pl2))
+
+    s3min, s4min, susmin, amin = pch_pm_slp()
+    print("""\t# Power
+\tregister "PchPmSlpS3MinAssert" = "{}"
+\tregister "PchPmSlpS4MinAssert" = "{}"
+\tregister "PchPmSlpSusMinAssert" = "{}"
+\tregister "PchPmSlpAMinAssert" = "{}"
+""".format(s3min, s4min, susmin, amin))
+
+    thermal = thermal()
+    print("""\t# Thermal
+\tregister "tcc_offset" = "{}"
+""".format(thermal))
+
+    gen1, gen2, gen3, gen4 = lpc()
+    print("""\t\tdevice pci 1f.0 on\t# LPC Interface
+\t\t\tregister "gen1_dec" = "{:#010x}"
+\t\t\tregister "gen2_dec" = "{:#010x}"
+\t\t\tregister "gen3_dec" = "{:#010x}"
+\t\t\tregister "gen4_dec" = "{:#010x}"
+\t\tend""".format(gen1, gen2, gen3, gen4))