#!/usr/bin/env python3
# Copyright(c) 2022 Intel Corporation. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
import os
import sys
import struct
import logging
import asyncio
import time
import subprocess
import ctypes
import mmap
import argparse
import socketserver
import threading
import netifaces

# Global variable use to sync between log and request services.
# When it is true, the adsp is able to start running.
start_output = False
lock = threading.Lock()

HOST = None
PORT_LOG = 9999
PORT_REQ = PORT_LOG + 1
BUF_SIZE = 4096
CMD_LOG_START = "start_log"
CMD_LOG_STOP = "stop_log"
CMD_DOWNLOAD = "download"

logging.basicConfig()
log = logging.getLogger("cavs-fw")
log.setLevel(logging.INFO)

PAGESZ = 4096
HUGEPAGESZ = 2 * 1024 * 1024
HUGEPAGE_FILE = "/dev/hugepages/cavs-fw-dma.tmp."

# SRAM windows.  Each appears in a 128k region starting at 512k.
#
# Window 0 is the FW_STATUS area, and 4k after that the IPC "outbox"
# Window 1 is the IPC "inbox" (host-writable memory, just 384 bytes currently)
# Window 2 is unused by this script
# Window 3 is winstream-formatted log output
OUTBOX_OFFSET    = (512 + (0 * 128)) * 1024 + 4096
INBOX_OFFSET     = (512 + (1 * 128)) * 1024
WINSTREAM_OFFSET = (512 + (3 * 128)) * 1024

# ADSPCS bits
CRST   = 0
CSTALL = 8
SPA    = 16
CPA    = 24

class HDAStream:
    # creates an hda stream with at 2 buffers of buf_len
    def __init__(self, stream_id: int):
        self.stream_id = stream_id
        self.base = hdamem + 0x0080 + (stream_id * 0x20)
        log.info(f"Mapping registers for hda stream {self.stream_id} at base {self.base:x}")

        self.hda = Regs(hdamem)
        self.hda.GCAP    = 0x0000
        self.hda.GCTL    = 0x0008
        self.hda.DPLBASE = 0x0070
        self.hda.DPUBASE = 0x0074
        self.hda.SPBFCH  = 0x0700
        self.hda.SPBFCTL = 0x0704
        self.hda.PPCH    = 0x0800
        self.hda.PPCTL   = 0x0804
        self.hda.PPSTS   = 0x0808
        self.hda.SPIB = 0x0708 + stream_id*0x08
        self.hda.freeze()

        self.regs = Regs(self.base)
        self.regs.CTL  = 0x00
        self.regs.STS  = 0x03
        self.regs.LPIB = 0x04
        self.regs.CBL  = 0x08
        self.regs.LVI  = 0x0c
        self.regs.FIFOW = 0x0e
        self.regs.FIFOS = 0x10
        self.regs.FMT = 0x12
        self.regs.FIFOL= 0x14
        self.regs.BDPL = 0x18
        self.regs.BDPU = 0x1c
        self.regs.freeze()

        self.dbg0 = Regs(hdamem + 0x0084 + (0x20*stream_id))
        self.dbg0.DPIB = 0x00
        self.dbg0.EFIFOS = 0x10
        self.dbg0.freeze()

        self.reset()

    def __del__(self):
        self.reset()

    def config(self, buf_len: int):
        log.info(f"Configuring stream {self.stream_id}")
        self.buf_len = buf_len
        log.info("Allocating huge page and setting up buffers")
        self.mem, self.hugef, self.buf_list_addr, self.pos_buf_addr, self.n_bufs = self.setup_buf(buf_len)

        log.info("Setting buffer list, length, and stream id and traffic priority bit")
        self.regs.CTL = ((self.stream_id & 0xFF) << 20) | (1 << 18) # must be set to something other than 0?
        self.regs.BDPU = (self.buf_list_addr >> 32) & 0xffffffff
        self.regs.BDPL = self.buf_list_addr & 0xffffffff
        self.regs.CBL = buf_len
        self.regs.LVI = self.n_bufs - 1
        self.debug()
        log.info(f"Configured stream {self.stream_id}")

    def write(self, data):

        bufl = min(len(data), self.buf_len)
        log.info(f"Writing data to stream {self.stream_id}, len {bufl}, SPBFCTL {self.hda.SPBFCTL:x}, SPIB {self.hda.SPIB}")
        self.mem[0:bufl] = data[0:bufl]
        self.mem[bufl:bufl+bufl] = data[0:bufl]
        self.hda.SPBFCTL |= (1 << self.stream_id)
        self.hda.SPIB += bufl
        log.info(f"Wrote data to stream {self.stream_id}, SPBFCTL {self.hda.SPBFCTL:x}, SPIB {self.hda.SPIB}")

    def start(self):
        log.info(f"Starting stream {self.stream_id}, CTL {self.regs.CTL:x}")
        self.regs.CTL |= 2
        log.info(f"Started stream {self.stream_id}, CTL {self.regs.CTL:x}")

    def stop(self):
        log.info(f"Stopping stream {self.stream_id}, CTL {self.regs.CTL:x}")
        self.regs.CTL &= 2
        time.sleep(0.1)
        self.regs.CTL |= 1
        log.info(f"Stopped stream {self.stream_id}, CTL {self.regs.CTL:x}")

    def setup_buf(self, buf_len: int):
        (mem, phys_addr, hugef) = map_phys_mem(self.stream_id)

        log.info(f"Mapped 2M huge page at 0x{phys_addr:x} for buf size ({buf_len})")

        # create two buffers in the page of buf_len and mark them
        # in a buffer descriptor list for the hardware to use
        buf0_len = buf_len
        buf1_len = buf_len
        bdl_off = buf0_len + buf1_len
        # bdl is 2 (64bits, 16 bytes) per entry, we have two
        mem[bdl_off:bdl_off + 32] = struct.pack("<QQQQ",
                                                phys_addr,
                                                buf0_len,
                                                phys_addr + buf0_len,
                                                buf1_len)
        dpib_off = bdl_off+32

        # ensure buffer is initialized, sanity
        for i in range(0, buf_len*2):
            mem[i] = 0

        log.info("Filled the buffer descriptor list (BDL) for DMA.")
        return (mem, hugef, phys_addr + bdl_off, phys_addr+dpib_off, 2)

    def debug(self):
        log.info("HDA %d: PPROC %d, CTL 0x%x, LPIB 0x%x, BDPU 0x%x, BDPL 0x%x, CBL 0x%x, LVI 0x%x",
                 self.stream_id, (hda.PPCTL >> self.stream_id) & 1, self.regs.CTL, self.regs.LPIB, self.regs.BDPU,
                 self.regs.BDPL, self.regs.CBL, self.regs.LVI)
        log.info("    FIFOW %d, FIFOS %d, FMT %x, FIFOL %d, DPIB %d, EFIFOS %d",
                 self.regs.FIFOW & 0x7, self.regs.FIFOS, self.regs.FMT, self.regs.FIFOL, self.dbg0.DPIB, self.dbg0.EFIFOS)
        log.info("    status: FIFORDY %d, DESE %d, FIFOE %d, BCIS %d",
                 (self.regs.STS >> 5) & 1, (self.regs.STS >> 4) & 1, (self.regs.STS >> 3) & 1, (self.regs.STS >> 2) & 1)

    def reset(self):
        # Turn DMA off and reset the stream.  Clearing START first is a
        # noop per the spec, but absolutely required for stability.
        # Apparently the reset doesn't stop the stream, and the next load
        # starts before it's ready and kills the load (and often the DSP).
        # The sleep too is required, on at least one board (a fast
        # chromebook) putting the two writes next each other also hangs
        # the DSP!
        log.info(f"Resetting stream {self.stream_id}")
        self.debug()
        self.regs.CTL &= ~2 # clear START
        time.sleep(0.1)
        # set enter reset bit
        self.regs.CTL = 1
        while (self.regs.CTL & 1) == 0: pass
        # clear enter reset bit to exit reset
        self.regs.CTL = 0
        while (self.regs.CTL & 1) == 1: pass

        log.info(f"Disable SPIB and set position 0 of stream {self.stream_id}")
        self.hda.SPBFCTL = 0
        self.hda.SPIB = 0

        #log.info("Setting dma position buffer and enable it")
        #self.hda.DPUBASE = self.pos_buf_addr >> 32 & 0xffffffff
        #self.hda.DPLBASE = self.pos_buf_addr & 0xfffffff0 | 1

        log.info(f"Enabling dsp capture (PROCEN) of stream {self.stream_id}")
        self.hda.PPCTL |= (1 << self.stream_id)

        self.debug()
        log.info(f"Reset stream {self.stream_id}")


def map_regs():
    p = runx(f"grep -iPl 'PCI_CLASS=40(10|38)0' /sys/bus/pci/devices/*/uevent")
    pcidir = os.path.dirname(p)

    # Platform/quirk detection.  ID lists cribbed from the SOF kernel driver
    global cavs15, cavs18, cavs25
    did = int(open(f"{pcidir}/device").read().rstrip(), 16)
    cavs15 = did in [ 0x5a98, 0x1a98, 0x3198 ]
    cavs18 = did in [ 0x9dc8, 0xa348, 0x02c8, 0x06c8, 0xa3f0 ]
    cavs25 = did in [ 0xa0c8, 0x43c8, 0x4b55, 0x4b58, 0x7ad0, 0x51c8 ]

    # Check sysfs for a loaded driver and remove it
    if os.path.exists(f"{pcidir}/driver"):
        mod = os.path.basename(os.readlink(f"{pcidir}/driver/module"))
        found_msg = f"Existing driver \"{mod}\" found"
        if args.log_only:
            log.info(found_msg)
        else:
            log.warning(found_msg + ", unloading module")
            runx(f"rmmod -f {mod}")

    # Disengage runtime power management so the kernel doesn't put it to sleep
    with open(f"{pcidir}/power/control", "w") as ctrl:
        ctrl.write("on")

    # Make sure PCI memory space access and busmastering are enabled.
    # Also disable interrupts so as not to confuse the kernel.
    with open(f"{pcidir}/config", "wb+") as cfg:
        cfg.seek(4)
        cfg.write(b'\x06\x04')

    # Standard HD Audio Registers
    global hdamem
    (hdamem, _) = bar_map(pcidir, 0)
    hda = Regs(hdamem)
    hda.GCAP    = 0x0000
    hda.GCTL    = 0x0008
    hda.SPBFCTL = 0x0704
    hda.PPCTL   = 0x0804

    # Find the ID of the first output stream
    hda_ostream_id = (hda.GCAP >> 8) & 0x0f # number of input streams
    log.info(f"Selected output stream {hda_ostream_id} (GCAP = 0x{hda.GCAP:x})")
    hda.SD_SPIB = 0x0708 + (8 * hda_ostream_id)
    hda.freeze()


    # Standard HD Audio Stream Descriptor
    sd = Regs(hdamem + 0x0080 + (hda_ostream_id * 0x20))
    sd.CTL  = 0x00
    sd.CBL  = 0x08
    sd.LVI  = 0x0c
    sd.BDPL = 0x18
    sd.BDPU = 0x1c
    sd.freeze()

    # Intel Audio DSP Registers
    global bar4_mmap
    (bar4_mem, bar4_mmap) = bar_map(pcidir, 4)
    dsp = Regs(bar4_mem)
    dsp.ADSPCS         = 0x00004
    dsp.HIPCTDR        = 0x00040 if cavs15 else 0x000c0
    dsp.HIPCTDA        =                        0x000c4 # 1.8+ only
    dsp.HIPCTDD        = 0x00044 if cavs15 else 0x000c8
    dsp.HIPCIDR        = 0x00048 if cavs15 else 0x000d0
    dsp.HIPCIDA        =                        0x000d4 # 1.8+ only
    dsp.HIPCIDD        = 0x0004c if cavs15 else 0x000d8
    dsp.SRAM_FW_STATUS = 0x80000 # Start of first SRAM window
    dsp.freeze()

    return (hda, sd, dsp, hda_ostream_id)

def setup_dma_mem(fw_bytes):
    (mem, phys_addr, _) = map_phys_mem(hda_ostream_id)
    mem[0:len(fw_bytes)] = fw_bytes

    log.info("Mapped 2M huge page at 0x%x to contain %d bytes of firmware"
          % (phys_addr, len(fw_bytes)))

    # HDA requires at least two buffers be defined, but we don't care about
    # boundaries because it's all a contiguous region. Place a vestigial
    # 128-byte (minimum size and alignment) buffer after the main one, and put
    # the 4-entry BDL list into the final 128 bytes of the page.
    buf0_len = HUGEPAGESZ - 2 * 128
    buf1_len = 128
    bdl_off = buf0_len + buf1_len
    mem[bdl_off:bdl_off + 32] = struct.pack("<QQQQ",
                                            phys_addr, buf0_len,
                                            phys_addr + buf0_len, buf1_len)
    log.info("Filled the buffer descriptor list (BDL) for DMA.")
    return (phys_addr + bdl_off, 2)

global_mmaps = [] # protect mmap mappings from garbage collection!

# Maps 2M of contiguous memory using a single page from hugetlbfs,
# then locates its physical address for use as a DMA buffer.
def map_phys_mem(stream_id):
    # Make sure hugetlbfs is mounted (not there on chromeos)
    os.system("mount | grep -q hugetlbfs ||"
              + " (mkdir -p /dev/hugepages; "
              + "  mount -t hugetlbfs hugetlbfs /dev/hugepages)")

    # Ensure the kernel has enough budget for one new page
    free = int(runx("awk '/HugePages_Free/ {print $2}' /proc/meminfo"))
    if free == 0:
        tot = 1 + int(runx("awk '/HugePages_Total/ {print $2}' /proc/meminfo"))
        os.system(f"echo {tot} > /proc/sys/vm/nr_hugepages")

    hugef_name = HUGEPAGE_FILE + str(stream_id)
    hugef = open(hugef_name, "w+")
    hugef.truncate(HUGEPAGESZ)
    mem = mmap.mmap(hugef.fileno(), HUGEPAGESZ)
    log.info("type of mem is %s", str(type(mem)))
    global_mmaps.append(mem)
    os.unlink(hugef_name)

    # Find the local process address of the mapping, then use that to extract
    # the physical address from the kernel's pagemap interface.  The physical
    # page frame number occupies the bottom bits of the entry.
    mem[0] = 0 # Fault the page in so it has an address!
    vaddr = ctypes.addressof(ctypes.c_int.from_buffer(mem))
    vpagenum = vaddr >> 12
    pagemap = open("/proc/self/pagemap", "rb")
    pagemap.seek(vpagenum * 8)
    pent = pagemap.read(8)
    paddr = (struct.unpack("Q", pent)[0] & ((1 << 55) - 1)) * PAGESZ
    pagemap.close()
    return (mem, paddr, hugef)

# Maps a PCI BAR and returns the in-process address
def bar_map(pcidir, barnum):
    f = open(pcidir + "/resource" + str(barnum), "r+")
    mm = mmap.mmap(f.fileno(), os.fstat(f.fileno()).st_size)
    global_mmaps.append(mm)
    log.info("Mapped PCI bar %d of length %d bytes."
             % (barnum, os.fstat(f.fileno()).st_size))
    return (ctypes.addressof(ctypes.c_int.from_buffer(mm)), mm)

# Syntactic sugar to make register block definition & use look nice.
# Instantiate from a base address, assign offsets to (uint32) named registers as
# fields, call freeze(), then the field acts as a direct alias for the register!
class Regs:
    def __init__(self, base_addr):
        vars(self)["base_addr"] = base_addr
        vars(self)["ptrs"] = {}
        vars(self)["frozen"] = False
    def freeze(self):
        vars(self)["frozen"] = True
    def __setattr__(self, name, val):
        if not self.frozen and name not in self.ptrs:
            addr = self.base_addr + val
            self.ptrs[name] = ctypes.c_uint32.from_address(addr)
        else:
            self.ptrs[name].value = val
    def __getattr__(self, name):
        return self.ptrs[name].value

def runx(cmd):
    return subprocess.check_output(cmd, shell=True).decode().rstrip()

def mask(bit):
    if cavs25:
        return 0b1 << bit
    if cavs18:
        return 0b1111 << bit
    if cavs15:
        return 0b11 << bit

def load_firmware(fw_file):
    try:
        fw_bytes = open(fw_file, "rb").read()
    except Exception as e:
        log.error(f"Could not read firmware file: `{fw_file}'")
        log.error(e)
        sys.exit(1)

    (magic, sz) = struct.unpack("4sI", fw_bytes[0:8])
    if magic == b'XMan':
        log.info(f"Trimming {sz} bytes of extended manifest")
        fw_bytes = fw_bytes[sz:len(fw_bytes)]

    # This actually means "enable access to BAR4 registers"!
    hda.PPCTL |= (1 << 30) # GPROCEN, "global processing enable"

    log.info("Resetting HDA device")
    hda.GCTL = 0
    while hda.GCTL & 1: pass
    hda.GCTL = 1
    while not hda.GCTL & 1: pass

    log.info(f"Stalling and Resetting DSP cores, ADSPCS = 0x{dsp.ADSPCS:x}")
    dsp.ADSPCS |= mask(CSTALL)
    dsp.ADSPCS |= mask(CRST)
    while (dsp.ADSPCS & mask(CRST)) == 0: pass

    log.info(f"Powering down DSP cores, ADSPCS = 0x{dsp.ADSPCS:x}")
    dsp.ADSPCS &= ~mask(SPA)
    while dsp.ADSPCS & mask(CPA): pass

    log.info(f"Configuring HDA stream {hda_ostream_id} to transfer firmware image")
    (buf_list_addr, num_bufs) = setup_dma_mem(fw_bytes)
    sd.CTL = 1
    while (sd.CTL & 1) == 0: pass
    sd.CTL = 0
    while (sd.CTL & 1) == 1: pass
    sd.CTL = (1 << 20) # Set stream ID to anything non-zero
    sd.BDPU = (buf_list_addr >> 32) & 0xffffffff
    sd.BDPL = buf_list_addr & 0xffffffff
    sd.CBL = len(fw_bytes)
    sd.LVI = num_bufs - 1
    hda.PPCTL |= (1 << hda_ostream_id)

    # SPIB ("Software Position In Buffer") is an Intel HDA extension
    # that puts a transfer boundary into the stream beyond which the
    # other side will not read.  The ROM wants to poll on a "buffer
    # full" bit on the other side that only works with this enabled.
    hda.SPBFCTL |= (1 << hda_ostream_id)
    hda.SD_SPIB = len(fw_bytes)

    # Start DSP.  Host needs to provide power to all cores on 1.5
    # (which also starts them) and 1.8 (merely gates power, DSP also
    # has to set PWRCTL). On 2.5 where the DSP has full control,
    # and only core 0 is set.
    log.info(f"Starting DSP, ADSPCS = 0x{dsp.ADSPCS:x}")
    dsp.ADSPCS = mask(SPA)
    while (dsp.ADSPCS & mask(CPA)) == 0: pass

    log.info(f"Unresetting DSP cores, ADSPCS = 0x{dsp.ADSPCS:x}")
    dsp.ADSPCS &= ~mask(CRST)
    while (dsp.ADSPCS & 1) != 0: pass

    log.info(f"Running DSP cores, ADSPCS = 0x{dsp.ADSPCS:x}")
    dsp.ADSPCS &= ~mask(CSTALL)

    # Wait for the ROM to boot and signal it's ready.  This not so short
    # sleep seems to be needed; if we're banging on the memory window
    # during initial boot (before/while the window control registers
    # are configured?) the DSP hardware will hang fairly reliably.
    log.info(f"Wait for ROM startup, ADSPCS = 0x{dsp.ADSPCS:x}")
    time.sleep(1)
    while (dsp.SRAM_FW_STATUS >> 24) != 5: pass

    # Send the DSP an IPC message to tell the device how to boot.
    # Note: with cAVS 1.8+ the ROM receives the stream argument as an
    # index within the array of output streams (and we always use the
    # first one by construction).  But with 1.5 it's the HDA index,
    # and depends on the number of input streams on the device.
    stream_idx = hda_ostream_id if cavs15 else 0
    ipcval = (  (1 << 31)            # BUSY bit
                | (0x01 << 24)       # type = PURGE_FW
                | (1 << 14)          # purge_fw = 1
                | (stream_idx << 9)) # dma_id
    log.info(f"Sending IPC command, HIPIDR = 0x{ipcval:x}")
    dsp.HIPCIDR = ipcval

    log.info(f"Starting DMA, FW_STATUS = 0x{dsp.SRAM_FW_STATUS:x}")
    sd.CTL |= 2 # START flag

    wait_fw_entered()

    # Turn DMA off and reset the stream.  Clearing START first is a
    # noop per the spec, but absolutely required for stability.
    # Apparently the reset doesn't stop the stream, and the next load
    # starts before it's ready and kills the load (and often the DSP).
    # The sleep too is required, on at least one board (a fast
    # chromebook) putting the two writes next each other also hangs
    # the DSP!
    sd.CTL &= ~2 # clear START
    time.sleep(1)
    sd.CTL |= 1
    log.info(f"cAVS firmware load complete")


def wait_fw_entered():
    log.info("Waiting for firmware handoff, FW_STATUS = 0x%x", dsp.SRAM_FW_STATUS)
    for _ in range(200):
        alive = dsp.SRAM_FW_STATUS & ((1 << 28) - 1) == 5 # "FW_ENTERED"
        if alive:
            break
        time.sleep(0.01)
    if not alive:
        log.warning("Load failed?  FW_STATUS = 0x%x", dsp.SRAM_FW_STATUS)


# This SHOULD be just "mem[start:start+length]", but slicing an mmap
# array seems to be unreliable on one of my machines (python 3.6.9 on
# Ubuntu 18.04).  Read out bytes individually.
def win_read(start, length):
    try:
        return b''.join(bar4_mmap[WINSTREAM_OFFSET + x].to_bytes(1, 'little')
                        for x in range(start, start + length))
    except IndexError as ie:
        # A FW in a bad state may cause winstream garbage
        log.error("IndexError in bar4_mmap[%d + %d]", WINSTREAM_OFFSET, start)
        log.error("bar4_mmap.size()=%d", bar4_mmap.size())
        raise ie

def win_hdr():
    return struct.unpack("<IIII", win_read(0, 16))

# Python implementation of the same algorithm in sys_winstream_read(),
# see there for details.
def winstream_read(last_seq):
    while True:
        (wlen, start, end, seq) = win_hdr()
        if last_seq == 0:
            last_seq = seq if args.no_history else (seq - ((end - start) % wlen))
        if seq == last_seq or start == end:
            return (seq, "")
        behind = seq - last_seq
        if behind > ((end - start) % wlen):
            return (seq, "")
        copy = (end - behind) % wlen
        suffix = min(behind, wlen - copy)
        result = win_read(16 + copy, suffix)
        if suffix < behind:
            result += win_read(16, behind - suffix)
        (wlen, start1, end, seq1) = win_hdr()
        if start1 == start and seq1 == seq:
            # Best effort attempt at decoding, replacing unusable characters
            # Found to be useful when it really goes wrong
            return (seq, result.decode("utf-8", "replace"))


async def ipc_delay_done():
    await asyncio.sleep(0.1)
    dsp.HIPCTDA = 1<<31

ipc_timestamp = 0

# Super-simple command language, driven by the test code on the DSP
def ipc_command(data, ext_data):
    send_msg = False
    done = True
    log.debug ("ipc data %d, ext_data %x", data, ext_data)
    if data == 0: # noop, with synchronous DONE
        pass
    elif data == 1: # async command: signal DONE after a delay (on 1.8+)
        if not cavs15:
            done = False
            asyncio.ensure_future(ipc_delay_done())
    elif data == 2: # echo back ext_data as a message command
        send_msg = True
    elif data == 3: # set ADSPCS
        dsp.ADSPCS = ext_data
    elif data == 4: # echo back microseconds since last timestamp command
        global ipc_timestamp
        t = round(time.time() * 1e6)
        ext_data = t - ipc_timestamp
        ipc_timestamp = t
        send_msg = True
    elif data == 5: # copy word at outbox[ext_data >> 16] to inbox[ext_data & 0xffff]
        src = OUTBOX_OFFSET + 4 * (ext_data >> 16)
        dst =  INBOX_OFFSET + 4 * (ext_data & 0xffff)
        for i in range(4):
            bar4_mmap[dst + i] = bar4_mmap[src + i]
    elif data == 6: # HDA RESET (init if not exists)
        stream_id = ext_data & 0xff
        if stream_id in hda_streams:
            hda_streams[stream_id].reset()
        else:
            hda_str = HDAStream(stream_id)
            hda_streams[stream_id] = hda_str
    elif data == 7: # HDA CONFIG
        stream_id = ext_data & 0xFF
        buf_len = ext_data >> 8 & 0xFFFF
        hda_str = hda_streams[stream_id]
        hda_str.config(buf_len)
    elif data == 8: # HDA START
        stream_id = ext_data & 0xFF
        hda_streams[stream_id].start()
        hda_streams[stream_id].mem.seek(0)

    elif data == 9: # HDA STOP
        stream_id = ext_data & 0xFF
        hda_streams[stream_id].stop()
    elif data == 10: # HDA VALIDATE
        stream_id = ext_data & 0xFF
        hda_str = hda_streams[stream_id]
        hda_str.debug()
        is_ramp_data = True
        hda_str.mem.seek(0)
        for (i, val) in enumerate(hda_str.mem.read(256)):
            if i != val:
                is_ramp_data = False
            # log.info("stream[%d][%d]: %d", stream_id, i, val) # debug helper
        log.info("Is ramp data? " + str(is_ramp_data))
        ext_data = int(is_ramp_data)
        log.info(f"Ext data to send back on ramp status {ext_data}")
        send_msg = True
    elif data == 11: # HDA HOST OUT SEND
        stream_id = ext_data & 0xff
        buf = bytearray(256)
        for i in range(0, 256):
            buf[i] = i
        hda_streams[stream_id].write(buf)
    elif data == 12: # HDA PRINT
        log.info("Doing HDA Print")
        stream_id = ext_data & 0xFF
        buf_len = ext_data >> 8 & 0xFFFF
        hda_str = hda_streams[stream_id]
        pos = hda_str.mem.tell()
        buf_data = hda_str.mem.read(buf_len).decode("utf-8", "replace")
        log.info(f"DSP LOG MSG (idx: {pos}, len: {buf_len}): {buf_data}")
        pos = hda_str.mem.tell()
        if pos >= hda_str.buf_len*2:
            log.info(f"Wrapping log reader, pos {pos} len {hda_str.buf_len}")
            hda_str.mem.seek(0)
    else:
        log.warning(f"cavstool: Unrecognized IPC command 0x{data:x} ext 0x{ext_data:x}")

    dsp.HIPCTDR = 1<<31 # Ack local interrupt, also signals DONE on v1.5
    if cavs18:
        time.sleep(0.01) # Needed on 1.8, or the command below won't send!

    if done and not cavs15:
        dsp.HIPCTDA = 1<<31 # Signal done
    if send_msg:
        dsp.HIPCIDD = ext_data
        dsp.HIPCIDR = (1<<31) | ext_data

async def _main(server):
    #TODO this bit me, remove the globals, write a little FirmwareLoader class or something to contain.
    global hda, sd, dsp, hda_ostream_id, hda_streams
    try:
        (hda, sd, dsp, hda_ostream_id) = map_regs()
    except Exception as e:
        log.error("Could not map device in sysfs; run as root?")
        log.error(e)
        sys.exit(1)

    log.info(f"Detected cAVS {'1.5' if cavs15 else '1.8+'} hardware")

    if args.log_only:
        wait_fw_entered()
    else:
        if not fw_file:
            log.error("Firmware file argument missing")
            sys.exit(1)

        load_firmware(fw_file)
        time.sleep(0.1)
        if not args.quiet:
            adsp_log("--\n", server)

    hda_streams = dict()

    last_seq = 0
    while start_output is True:
        await asyncio.sleep(0.03)
        (last_seq, output) = winstream_read(last_seq)
        if output:
            adsp_log(output, server)
        if dsp.HIPCTDR & 0x80000000:
            ipc_command(dsp.HIPCTDR & ~0x80000000, dsp.HIPCTDD)
        if dsp.HIPCIDA & 0x80000000:
            dsp.HIPCIDA = 1<<31 # must ACK any DONE interrupts that arrive!

class adsp_request_handler(socketserver.BaseRequestHandler):
    """
    The request handler class for control the actions of server.
    """

    def receive_fw(self, filename):
        try:
            with open(fw_file,'wb') as f:
                cnt = 0
                log.info("Receiving...")

                while True:
                    l = self.request.recv(BUF_SIZE)
                    ll = len(l)
                    cnt = cnt + ll
                    if not l:
                        break
                    else:
                        f.write(l)
        except Exception as e:
            log.error(f"Get exception {e} during FW transfer.")
            return 1

        log.info(f"Done Receiving {cnt}.")

    def handle(self):
        global start_output, fw_file

        cmd = self.request.recv(BUF_SIZE)
        log.info(f"{self.client_address[0]} wrote: {cmd}")
        action = cmd.decode("utf-8")
        log.debug(f'load {action}')

        if action == CMD_DOWNLOAD:
            self.request.sendall(cmd)
            recv_fn = self.request.recv(BUF_SIZE)
            log.info(f"{self.client_address[0]} wrote: {recv_fn}")

            try:
                tmp_file = recv_fn.decode("utf-8")
            except UnicodeDecodeError:
                tmp_file = "zephyr.ri.decode_error"
                log.info(f'did not receive a correct filename')

            lock.acquire()
            fw_file = tmp_file
            ret = self.receive_fw(fw_file)
            if not ret:
                start_output = True
            lock.release()

            log.debug(f'{recv_fn}, {fw_file}, {start_output}')

        elif action == CMD_LOG_STOP:
            self.request.sendall(cmd)
            lock.acquire()
            start_output = False
            if fw_file:
                os.remove(fw_file)
                fw_file = None
            lock.release()
        else:
            log.error("incorrect load communitcation!")

class adsp_log_handler(socketserver.BaseRequestHandler):
    """
    The log handler class for grabbing output messages of server.
    """
    def run_adsp(self):
        self.loop = asyncio.get_event_loop()
        self.loop.run_until_complete(_main(self))

    def handle(self):
        global start_output, fw_file

        cmd = self.request.recv(BUF_SIZE)
        log.info(f"{self.client_address[0]} wrote: {cmd}")
        action = cmd.decode("utf-8")
        log.debug(f'monitor {action}')

        if action == CMD_LOG_START:
            self.request.sendall(cmd)
            log.info(f"Waiting for instruction...")
            while start_output is False:
                time.sleep(1)

            log.info(f"Loaded FW {fw_file} and running...")
            if os.path.exists(fw_file):
                self.run_adsp()
                self.request.sendall("service complete.".encode())
                log.info("service complete.")
            else:
                log.error("cannot find the FW file")

            lock.acquire()
            fw_file = None
            start_output = False
            lock.release()

        else:
            log.error("incorrect monitor communitcation!")


def adsp_log(output, server):
    if server:
        server.request.sendall(output.encode("utf-8"))
    else:
        sys.stdout.write(output)
        sys.stdout.flush()

def get_host_ip():
    """
    Helper tool use to detect host's serving ip address.
    """
    interfaces = netifaces.interfaces()

    for i in interfaces:
        if i != "lo":
            try:
                netifaces.ifaddresses(i)
                ip = netifaces.ifaddresses(i)[netifaces.AF_INET][0]['addr']
                log.info (f"Use interface {i}, IP address: {ip}")
            except Exception:
                log.info(f"Ignore the interface {i} which is not activated.")
    return ip


ap = argparse.ArgumentParser(description="DSP loader/logger tool")
ap.add_argument("-q", "--quiet", action="store_true",
                help="No loader output, just DSP logging")
ap.add_argument("-l", "--log-only", action="store_true",
                help="Don't load firmware, just show log output")
ap.add_argument("-n", "--no-history", action="store_true",
                help="No current log buffer at start, just new output")
ap.add_argument("-s", "--server-addr",
                help="No current log buffer at start, just new output")
ap.add_argument("fw_file", nargs="?", help="Firmware file")

args = ap.parse_args()

if args.quiet:
    log.setLevel(logging.WARN)

if args.fw_file:
    fw_file = args.fw_file
else:
    fw_file = None

if args.server_addr:
    HOST = args.server_addr
else:
    HOST = get_host_ip()

if __name__ == "__main__":

    # When fw_file is assigned or in log_only mode, it will
    # not serve as a daemon. That mean it just run load
    # firmware or read the log directly.
    if args.fw_file or args.log_only:
        start_output = True
        try:
            asyncio.get_event_loop().run_until_complete(_main(None))
        except KeyboardInterrupt:
            start_output = False
        finally:
            sys.exit(0)

    # Launch the command request service
    socketserver.TCPServer.allow_reuse_address = True
    req_server = socketserver.TCPServer((HOST, PORT_REQ), adsp_request_handler)
    req_t = threading.Thread(target=req_server.serve_forever, daemon=True)

    # Activate the log service which output adsp execution
    with socketserver.TCPServer((HOST, PORT_LOG), adsp_log_handler) as log_server:
        try:
            log.info("Req server start...")
            req_t.start()
            log.info("Log server start...")
            log_server.serve_forever()
        except KeyboardInterrupt:
            lock.acquire()
            start_output = False
            lock.release()
            log_server.shutdown()
            req_server.shutdown()