ARM: SAMSUNG: Add script to change old clksrc_clk to new register defs

This script is used to change the old style clksrc_clk as originally
found in plat-s3c64xx to the new style. It is here for reference if needed
for future code merges.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

diff --git a/Documentation/arm/Samsung/clksrc-change-registers.awk b/Documentation/arm/Samsung/clksrc-change-registers.awk
new file mode 100755 (executable)
index 0000000..0c50220
--- /dev/null
+++ b/Documentation/arm/Samsung/clksrc-change-registers.awk
@@ -0,0 +1,167 @@
+#!/usr/bin/awk -f
+#
+# Copyright 2010 Ben Dooks <ben-linux@fluff.org>
+#
+# Released under GPLv2
+
+# example usage
+# ./clksrc-change-registers.awk arch/arm/plat-s5pc1xx/include/plat/regs-clock.h < src > dst
+
+function extract_value(s)
+{
+    eqat = index(s, "=")
+    comat = index(s, ",")
+    return substr(s, eqat+2, (comat-eqat)-2)
+}
+
+function remove_brackets(b)
+{
+    return substr(b, 2, length(b)-2)
+}
+
+function splitdefine(l, p)
+{
+    r = split(l, tp)
+
+    p[0] = tp[2]
+    p[1] = remove_brackets(tp[3])
+}
+
+function find_length(f)
+{
+    if (0)
+       printf "find_length " f "\n" > "/dev/stderr"
+
+    if (f ~ /0x1/)
+       return 1
+    else if (f ~ /0x3/)
+       return 2
+    else if (f ~ /0x7/)
+       return 3
+    else if (f ~ /0xf/)
+       return 4
+
+    printf "unknown legnth " f "\n" > "/dev/stderr"
+    exit
+}
+
+function find_shift(s)
+{
+    id = index(s, "<")
+    if (id <= 0) {
+       printf "cannot find shift " s "\n" > "/dev/stderr"
+       exit
+    }
+
+    return substr(s, id+2)
+}
+
+
+BEGIN {
+    if (ARGC < 2) {
+       print "too few arguments" > "/dev/stderr"
+       exit
+    }
+
+# read the header file and find the mask values that we will need
+# to replace and create an associative array of values
+
+    while (getline line < ARGV[1] > 0) {
+       if (line ~ /\#define.*_MASK/ &&
+           !(line ~ /S5PC100_EPLL_MASK/) &&
+           !(line ~ /USB_SIG_MASK/)) {
+           splitdefine(line, fields)
+           name = fields[0]
+           if (0)
+               printf "MASK " line "\n" > "/dev/stderr"
+           dmask[name,0] = find_length(fields[1])
+           dmask[name,1] = find_shift(fields[1])
+           if (0)
+               printf "=> '" name "' LENGTH=" dmask[name,0] " SHIFT=" dmask[name,1] "\n" > "/dev/stderr"
+       } else {
+       }
+    }
+
+    delete ARGV[1]
+}
+
+/clksrc_clk.*=.*{/ {
+    shift=""
+    mask=""
+    divshift=""
+    reg_div=""
+    reg_src=""
+    indent=1
+
+    print $0
+
+    for(; indent >= 1;) {
+       if ((getline line) <= 0) {
+           printf "unexpected end of file" > "/dev/stderr"
+           exit 1;
+       }
+
+       if (line ~ /\.shift/) {
+           shift = extract_value(line)
+       } else if (line ~ /\.mask/) {
+           mask = extract_value(line)
+       } else if (line ~ /\.reg_divider/) {
+           reg_div = extract_value(line)
+       } else if (line ~ /\.reg_source/) {
+           reg_src = extract_value(line)
+       } else if (line ~ /\.divider_shift/) {
+           divshift = extract_value(line)
+       } else if (line ~ /{/) {
+               indent++
+               print line
+           } else if (line ~ /}/) {
+           indent--
+
+           if (indent == 0) {
+               if (0) {
+                   printf "shift '" shift   "' ='" dmask[shift,0] "'\n" > "/dev/stderr"
+                   printf "mask  '" mask    "'\n" > "/dev/stderr"
+                   printf "dshft '" divshift "'\n" > "/dev/stderr"
+                   printf "rdiv  '" reg_div "'\n" > "/dev/stderr"
+                   printf "rsrc  '" reg_src "'\n" > "/dev/stderr"
+               }
+
+               generated = mask
+               sub(reg_src, reg_div, generated)
+
+               if (0) {
+                   printf "/* rsrc " reg_src " */\n"
+                   printf "/* rdiv " reg_div " */\n"
+                   printf "/* shift " shift " */\n"
+                   printf "/* mask " mask " */\n"
+                   printf "/* generated " generated " */\n"
+               }
+
+               if (reg_div != "") {
+                   printf "\t.reg_div = { "
+                   printf ".reg = " reg_div ", "
+                   printf ".shift = " dmask[generated,1] ", "
+                   printf ".size = " dmask[generated,0] ", "
+                   printf "},\n"
+               }
+
+               printf "\t.reg_src = { "
+               printf ".reg = " reg_src ", "
+               printf ".shift = " dmask[mask,1] ", "
+               printf ".size = " dmask[mask,0] ", "
+
+               printf "},\n"
+
+           }
+
+           print line
+       } else {
+           print line
+       }
+
+       if (0)
+           printf indent ":" line "\n" > "/dev/stderr"
+    }
+}
+
+// && ! /clksrc_clk.*=.*{/ { print $0 }