# TI AM335x Beaglebone (Black)
# Maintainer: Kevin Mihelich <kevin@archlinuxarm.org>

buildarch=4

pkgbase=linux-am33x
_srcname=linux-7.1
_kernelname=${pkgbase#linux}
_desc="TI AM335x Beaglebone (Black)"
pkgver=7.1.4
pkgrel=1
arch=('armv7h')
url="https://www.kernel.org/"
license=('GPL-2.0-only')
makedepends=('xmlto' 'docbook-xsl' 'kmod' 'inetutils' 'bc' 'git' 'dtc')
options=('!strip')
source=("https://www.kernel.org/pub/linux/kernel/v7.x/${_srcname}.tar.xz"
        "https://www.kernel.org/pub/linux/kernel/v7.x/patch-${pkgver}.xz"
        "git+https://github.com/beagleboard/BeagleBoard-DeviceTrees.git#branch=v7.1.x"
        'config'
        'linux.preset'
        '99-linux.hook'
        'firmware.tar.xz')
md5sums=('b6b169bbd9c9c19857ad16db2ddf8def'
         '0f903f42c04a7b254f8e636fc6f723c7'
         'SKIP'
         '97779e3711dfcbf5ab281bfd56600c3f'
         'c733051a2f80ac8f250c8ce2338175b1'
         '79fa396e3f9a09a85156d6d7c2d34b58'
         '1722d286e6a9bdd50c49b33774f32900')

prepare() {
  cd "${srcdir}/${_srcname}"

  # add upstream patch
  git apply --whitespace=nowarn "${srcdir}/patch-${pkgver}"

  # RCN patch
  # git apply ../patch-${rcnver%.0}-${rcnrel}.diff

  # ALARM patches
  # git apply ../0001-add-lcd-cape-for-chiliboard.patch

  cat "${srcdir}/config" > ./.config

  # add pkgrel to extraversion
  sed -ri "s|^(EXTRAVERSION =)(.*)|\1 \2-${pkgrel}|" Makefile

  # don't run depmod on 'make install'. We'll do this ourselves in packaging
  sed -i '2iexit 0' scripts/depmod.sh

  #  ln -s "${srcdir}/firmware" firmware
}

build() {
  cd "${srcdir}/${_srcname}"

  # get kernel version
  make prepare

  # load configuration
  # Configure the kernel. Replace the line below with one of your choice.
  #make menuconfig # CLI menu for configuration
  #make nconfig # new CLI menu for configuration
  #make xconfig # X-based configuration
  #make oldconfig # using old config from previous kernel version
  # ... or manually edit .config

  # Copy back our configuration (use with new kernel version)
  #cp ./.config ../${pkgbase}.config

  ####################
  # stop here
  # this is useful to configure the kernel
  #msg "Stopping build"
  #return 1
  ####################

  #yes "" | make config

  # build!
  XZ_DEFAULTS=--memlimit=300MiB CFLAGS="--param ggc-min-expand=10 --param ggc-min-heapsize=8192" make ${MAKEFLAGS} zImage modules

  # build overlays
  cd "${srcdir}/BeagleBoard-DeviceTrees"
  make DTC=/usr/bin/dtc
}

_package() {
  pkgdesc="The Linux Kernel and modules - ${_desc}"
  depends=('coreutils' 'kmod' 'mkinitcpio>=0.7')
  optdepends=('linux-firmware: firmware images needed for some devices'
              'wireless-regdb: to set the correct wireless channels of your country')
  provides=("linux=${pkgver}" "WIREGUARD-MODULE")
  conflicts=('linux')
  replaces=('linux-ti')
  install=${pkgname}.install

  cd "${srcdir}/${_srcname}"

  KARCH=arm

  # get kernel version
  _kernver="$(make kernelrelease)"
  _basekernel=${_kernver%%-*}
  _basekernel=${_basekernel%.*}

  mkdir -p "${pkgdir}"/{lib/modules,lib/firmware,boot}
  make INSTALL_MOD_PATH="${pkgdir}" modules_install
#  make INSTALL_DTBS_PATH="${pkgdir}/boot/dtbs" dtbs_install
  cp arch/$KARCH/boot/zImage "${pkgdir}/boot/zImage"

  # set correct depmod command for install
  sed \
    -e  "s/KERNEL_NAME=.*/KERNEL_NAME=${_kernelname}/g" \
    -e  "s/KERNEL_VERSION=.*/KERNEL_VERSION=${_kernver}/g" \
    -i "${startdir}/${pkgname}.install"

  # install mkinitcpio preset file for kernel
  install -D -m644 "${srcdir}/linux.preset" "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"
  sed \
    -e "1s|'linux.*'|'${pkgbase}'|" \
    -e "s|ALL_kver=.*|ALL_kver=\"${_kernver}\"|" \
    -i "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  # install pacman hook for initramfs regeneration
  sed "s|%PKGBASE%|${pkgbase}|g" "${srcdir}/99-linux.hook" |
    install -D -m644 /dev/stdin "${pkgdir}/usr/share/libalpm/hooks/99-${pkgbase}.hook"

  # remove build and source links
  rm -f "${pkgdir}"/lib/modules/${_kernver}/{source,build}
  # remove the firmware
  rm -rf "${pkgdir}/lib/firmware"
  # make room for external modules
  ln -s "../extramodules-${_basekernel}${_kernelname:--ARCH}" "${pkgdir}/lib/modules/${_kernver}/extramodules"
  # add real version for building modules and running depmod from post_install/upgrade
  mkdir -p "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}"
  echo "${_kernver}" > "${pkgdir}/lib/modules/extramodules-${_basekernel}${_kernelname:--ARCH}/version"

  # Now we call depmod...
  depmod -b "$pkgdir" -F System.map "$_kernver"

  # move module tree /lib -> /usr/lib
  mkdir -p "${pkgdir}/usr"
  mv "$pkgdir/lib" "$pkgdir/usr"

  # install device tree + overlays
  cd "${srcdir}/BeagleBoard-DeviceTrees"
  pwd
  mkdir -p "${pkgdir}/boot/dtbs/overlays"
  ls src/arm/ti/omap/*.dtb src/arm/overlays/*.dtbo
  ls "${pkgdir}/boot/dtbs" "${pkgdir}/boot/dtbs/overlays"
  cp src/arm/ti/omap/*.dtb  "${pkgdir}/boot/dtbs"
  cp src/arm/overlays/*.dtbo  "${pkgdir}/boot/dtbs/overlays"
}

_package-headers() {
  pkgdesc="Header files and scripts for building modules for linux kernel - ${_desc}"
  provides=("linux-headers=${pkgver}")
  conflicts=('linux-headers')
  replaces=('linux-ti-headers')

  cd ${_srcname}
  local _builddir="${pkgdir}/usr/lib/modules/${_kernver}/build"

  install -Dt "${_builddir}" -m644 Makefile .config Module.symvers
  install -Dt "${_builddir}/kernel" -m644 kernel/Makefile

  mkdir "${_builddir}/.tmp_versions"

  cp -t "${_builddir}" -a include scripts

  install -Dt "${_builddir}/arch/${KARCH}" -m644 arch/${KARCH}/Makefile
  install -Dt "${_builddir}/arch/${KARCH}/kernel" -m644 arch/${KARCH}/kernel/asm-offsets.s

  cp -t "${_builddir}/arch/${KARCH}" -a arch/${KARCH}/include

  install -Dt "${_builddir}/drivers/md" -m644 drivers/md/*.h
  install -Dt "${_builddir}/net/mac80211" -m644 net/mac80211/*.h

  # http://bugs.archlinux.org/task/13146
  install -Dt "${_builddir}/drivers/media/i2c" -m644 drivers/media/i2c/msp3400-driver.h

  # http://bugs.archlinux.org/task/20402
  install -Dt "${_builddir}/drivers/media/usb/dvb-usb" -m644 drivers/media/usb/dvb-usb/*.h
  install -Dt "${_builddir}/drivers/media/dvb-frontends" -m644 drivers/media/dvb-frontends/*.h
  install -Dt "${_builddir}/drivers/media/tuners" -m644 drivers/media/tuners/*.h

  # add xfs and shmem for aufs building
  mkdir -p "${_builddir}"/{fs/xfs,mm}

  # copy in Kconfig files
  find . -name Kconfig\* -exec install -Dm644 {} "${_builddir}/{}" \;

  # remove unneeded architectures
  local _arch
  for _arch in "${_builddir}"/arch/*/; do
    [[ ${_arch} == */${KARCH}/ ]] && continue
    rm -r "${_arch}"
  done

  # remove files already in linux-docs package
  rm -r "${_builddir}/Documentation"

  # remove now broken symlinks
  find -L "${_builddir}" -type l -printf 'Removing %P\n' -delete

  # Fix permissions
  chmod -R u=rwX,go=rX "${_builddir}"

  # strip scripts directory
  local _binary _strip
  while read -rd '' _binary; do
    case "$(file -bi "${_binary}")" in
      *application/x-sharedlib*)  _strip="${STRIP_SHARED}"   ;; # Libraries (.so)
      *application/x-archive*)    _strip="${STRIP_STATIC}"   ;; # Libraries (.a)
      *application/x-executable*) _strip="${STRIP_BINARIES}" ;; # Binaries
      *) continue ;;
    esac
    /usr/bin/strip ${_strip} "${_binary}"
  done < <(find "${_builddir}/scripts" -type f -perm -u+w -print0 2>/dev/null)
}

pkgname=("${pkgbase}" "${pkgbase}-headers")
for _p in ${pkgname[@]}; do
  eval "package_${_p}() {
    _package${_p#${pkgbase}}
  }"
done