###############################################################################
# Helper script: /load_kernel_modules.scr/platform/aarch64/rk3399
# Purpose......: Set the Kernel modules for Hardware Models that use the RK3399
#                SoC within the Slackware initial RAM disk ('OS initrd')
#                and the Slackware installer.
#                Currently supported Hardware Models:
#                * Rock Pro 64
#                This script is sourced from '/load_kernel_modules'
# Author.......: Stuart Winter <mozes@slackware.com>
# Date.........: 30-Mar-2021
# Maintainer...: Stuart Winter <mozes@slackware.com>
#
# Please use this as a reference and example of how to add support for
# a new SoC to Slackware ARM/AArch64.
#
# Important Note:
# * You must _append_ to the module lists (include the variable
#   name within the variable itself), otherwise the base
#   set of modules will not be loaded and would result in
#   a Kernel panic.
# * The initrd uses the 'bash' shell, rather than 'busybox'
#   (as in upstream/x86 Slackware). This allows you (for example)
#   to use 'fallthrough' (case statements terminated with ';&'
#   rather than ';;') within case statements and regular expression
#   matches within 'if' statements.
#   This permits the 'c'-style switch statements where you can
#   'inherit' the previous matches as you move down the cases.
#   This enables you to match on varients of boards, and inherit
#   a 'baseline' of platform modules for that board.
#
# The 'PLATWALK' match is to enable build scripts to process these
# scripts outside of the initrd environment and determine which
# modules will be loaded by a particular Hardware Model.  This must remain
# in place for all scripts.
###############################################################################

# Note: The '*' is used because there is >1 version of the RockPro64, but
# the Kernel modules required are the same.
case $HWM in
   "Pine64 RockPro64"*|"Pine64 Pinebook Pro"*|PLATWALK)
      platform_detected=1
      echo "Architecture: ${ARCH}, Hardware model: ${HWM}"
      # If one of the modules within the base list is causing problems on
      # your platform, here are the options laid out as examples:
      # USB="${USB/ehci_orion/differentmodule}" # Substitute module 'ehci_orion' with 'differentmodule'
      # USB="${USB/ehci_orion/}" # Remove the 'ehci_orion' module from the list
      MOD_GPIO+="   gpio_rockchip"
      MOD_PHY+="    pcie_rockchip_host phy_rockchip_pcie phy_rockchip_emmc \
                    phy_rockchip_inno_usb2 phy_rockchip_pcie phy_rockchip_typec"
      MOD_VIDEO+="  drm dw_hdmi dw_mipi_dsi analogix_dp drm_dp_aux_bus rockchipdrm panel_simple"
      MOD_CARDS+="  dw_mmc dw_mmc_pltfm dw_mmc_rockchip sdhci_of_arasan"
      MOD_USB+="    dwc3 dwc3_of_simple"
      MOD_NET+="    rk_gmac-dwmac" 
      MOD_CMP+="    "
      MOD_CRYPTO+=" "
      # Example to detect hardware at runtime:
      #{ lspci 2>/dev/null | grep -q 'SATA cont.*ATA' ;} && MOD_XX="$MOD_XX yyy"
      # The following modules do not inherit:
      MOD_RTC="rtc_rk808"
      # Modules for the peripherals on the Hardware Model's main board
      # (outside of the SoC itself)
      MOD_HWM=""
      # Modules for the IP blocks/peripherals embedded within the SoC:
      MOD_SOC="i2c-rk3x"

      # Define a function to run from the OS InitRD's '/init' immediately prior
      # to switching into the Slackware OS proper.
      # This is after any software RAID arrays et al have been initialised.
      # There's no current use case for this, but it may be useful in the future.
      #
      # At this stage, the following paths for Slackware OS are mounted:
      # /proc, /sys, /run, /dev
      # The root file system ('/') is mounted under /mnt
      #
      #function hwm_hook_pre_switch_root() {
      #  echo "Just about to switch into the Slackware OS proper, leaving the OS InitRD"
      #  sleep 4
      #}
      ;;
esac

# Specific Hardware Model settings:
#case $HWM in
#   "Pine64 Pinebook Pro"*|PLATWALK)
#      function hwm_hook_pre_switch_root() {
#            ;}
#   ;;
#esac

# The '/load_kernel_modules' script will load the modules
# set above.