Read H3 SID by register access with sunxi-fel

fel_sid_read.sh

#! /bin/bash

SID_PRCTL=0x01c14040
SID_PRKEY=0x01c14050
SID_RDKEY=0x01c14060
 
BIT() {
        echo $(( 1 << $1 ))
}
 
SID_OP_LOCK=$((0xAC))
 
SID_READ=$(BIT 1)
SID_WRITE=$(BIT 2)
 
INDEX_OFFSET=16
INDEX_MASK=$(( 0x1ff << $INDEX_OFFSET ))
OP_OFFSET=8
OP_MASK=$(( 0xff << $OP_OFFSET ))
RW_MASK=$(( $SID_READ | $SID_WRITE ))
 
readl() {
        while ! sunxi-fel readl $1; do
		true
	done
}
 
writel() {
	while ! sunxi-fel writel $2 $1; do
		true
	done
}
 
dec2hex() {
        printf 0x%x $1
}
 
hex2dec() {
        echo $(($1))
}
 
sid_read_key() {
        local reg_val
 
        reg_val=$(readl $SID_PRCTL)
        reg_val=$(( $reg_val & (~$INDEX_MASK) ))
        reg_val=$(( $reg_val & (~$RW_MASK) ))
        reg_val=$(( $reg_val | ($1 << $INDEX_OFFSET) ))
        writel $reg_val $SID_PRCTL
 
        reg_val=$(( $reg_val & (~$OP_MASK) ))
        reg_val=$(( $reg_val & (~$RW_MASK) ))
        reg_val=$(( $reg_val | ($SID_OP_LOCK << $OP_OFFSET) ))
        reg_val=$(( $reg_val | $SID_READ ))
        writel $reg_val $SID_PRCTL
 
        while (( $(readl $SID_PRCTL) & $SID_READ ))
        do
                true
        done
 
        reg_val=$(( $reg_val & (~$INDEX_MASK) ))
        reg_val=$(( $reg_val & (~$OP_MASK) ))
        reg_val=$(( $reg_val & (~$RW_MASK) ))
        writel $reg_val $SID_PRCTL
 
        readl $SID_RDKEY
}

echo $(sid_read_key 0x0) $(sid_read_key 0x4) $(sid_read_key 0x8) $(sid_read_key 0xc)