# Maintainer: Markus Fritsche <mfritsche@reauktion.de>
#
# linux-fresnel-fourier — overclocked + DTS-tweaked Pinebook Pro kernel
# baselined on mmind/linux-rockchip v7.0.
#
# Coexists with linux-eos-arm; ships its own /boot/{Image,dtbs}-fresnel-fourier
# paths. Extlinux entry adds itself as a parallel boot option; user picks at
# u-boot menu. Reverting = boot the linux-eos-arm entry.

pkgbase=linux-fresnel-fourier
pkgname=("$pkgbase" "$pkgbase-headers")
pkgver=7.0
pkgrel=1
pkgdesc='Pinebook Pro kernel (mmind/linux-rockchip v7.0 + OC OPP + PBP DTS tweaks)'
arch=(aarch64)
url='https://git.reauktion.de/marfrit/kernel-agent'
license=(GPL-2.0-only)
makedepends=(
  bc cpio gettext kmod libelf pahole perl python tar xz
  distcc ccache
  uboot-tools dtc
)
options=('!strip')
source=(
  "https://git.kernel.org/torvalds/t/linux-${pkgver}.tar.gz"
  '0001-arm64-dts-rk3399-pinebook-pro-add-OC-OPP-tables-1704-2184.patch'
  '0002-arm64-dts-rk3399-pinebook-pro-enable-hdmi-sound.patch'
  '0003-arm64-dts-rk3399-pinebook-pro-spi1-max-freq-10MHz.patch'
  'config'  # snapshot of fresnel /usr/lib/modules/6.19.10-1-eos-arm/build/.config
  'linux-fresnel-fourier.preset'
  'extlinux-add.hook'
  'extlinux-add.sh'
)
sha256sums=('SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP' 'SKIP')

_kernver=${pkgver}.0-fresnel-fourier
_srcdir=linux-${pkgver}

prepare() {
  cd "${_srcdir}"

  echo ":: applying patches"
  for p in "${srcdir}"/*.patch; do
    echo "   $(basename "$p")"
    patch -Np1 -i "$p"
  done

  echo ":: writing config"
  cp "${srcdir}/config" .config

  # Force EXTRAVERSION suffix so the kernel version string and module dir
  # become ${_kernver} — keeps them disjoint from linux-eos-arm.
  scripts/config --set-str LOCALVERSION "-fresnel-fourier"
  scripts/config -d LOCALVERSION_AUTO

  echo ":: olddefconfig (accept new symbols sensibly)"
  make olddefconfig

  make -s kernelrelease > version
  echo ":: kernel release: $(<version)"
}

build() {
  cd "${_srcdir}"
  unset LDFLAGS
  export DISTCC_HOSTS="localhost/8 tesla:3632/4,lzo,cpp dcc1.local:3632/4,lzo,cpp dcc2.local:3632/4,lzo,cpp"
  export CC="ccache distcc gcc"
  export HOSTCC="ccache gcc"
  make ${MAKEFLAGS:--j16} Image modules dtbs
}

_package() {
  pkgdesc='Pinebook Pro overclocked kernel (fresnel-fourier baseline)'
  depends=(coreutils kmod mkinitcpio uboot-tools)
  optdepends=('linux-firmware: firmware images needed for some devices')
  backup=("etc/mkinitcpio.d/${pkgbase}.preset")

  cd "${_srcdir}"
  local _kver
  _kver=$(<version)

  install -Dm644 arch/arm64/boot/Image \
    "${pkgdir}/boot/Image-fresnel-fourier"

  # DTBs into a private tree to avoid clobbering linux-eos-arm
  install -d "${pkgdir}/boot/dtbs-fresnel-fourier/rockchip"
  cp -a arch/arm64/boot/dts/rockchip/*.dtb \
    "${pkgdir}/boot/dtbs-fresnel-fourier/rockchip/"

  ZSTD_CLEVEL=19 make INSTALL_MOD_PATH="${pkgdir}/usr" \
    INSTALL_MOD_STRIP=1 modules_install
  rm -f "${pkgdir}/usr/lib/modules/${_kver}/"{source,build}

  install -Dm644 "${srcdir}/${pkgbase}.preset" \
    "${pkgdir}/etc/mkinitcpio.d/${pkgbase}.preset"

  install -Dm755 "${srcdir}/extlinux-add.hook" \
    "${pkgdir}/usr/share/libalpm/hooks/95-${pkgbase}-extlinux.hook"
  install -Dm755 "${srcdir}/extlinux-add.sh" \
    "${pkgdir}/usr/share/libalpm/scripts/${pkgbase}-extlinux"
}

_package-headers() {
  pkgdesc='Headers and scripts for the linux-fresnel-fourier kernel'
  depends=(pahole)

  cd "${_srcdir}"
  local _kver _builddir
  _kver=$(<version)
  _builddir="${pkgdir}/usr/lib/modules/${_kver}/build"

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

  cp -a scripts "${_builddir}"
  install -Dt "${_builddir}/arch/arm64" -m644 arch/arm64/Makefile
  cp -a arch/arm64/include "${_builddir}/arch/arm64/"
  cp -a include "${_builddir}/"

  find . -name 'Kbuild' -exec install -Dm644 {} "${_builddir}/{}" \;
  find . -name 'Kconfig*' -exec install -Dm644 {} "${_builddir}/{}" \;

  ln -sr "${_builddir}" "${pkgdir}/usr/src/${pkgbase}"
}

eval "package_${pkgbase}() { _package; }"
eval "package_${pkgbase}-headers() { _package-headers; }"