Documentation/arm/samsung/clksrc-change-registers.awk

   1 #!/usr/bin/awk -f
   2 #
   3 # Copyright 2010 Ben Dooks <ben-linux@fluff.org>
   4 #
   5 # Released under GPLv2
   6
   7 # example usage
   8 # ./clksrc-change-registers.awk arch/arm/plat-s5pc1xx/include/plat/regs-clock.h < src > dst
   9
  10 function extract_value(s)
  11 {
  12     eqat = index(s, "=")
  13     comat = index(s, ",")
  14     return substr(s, eqat+2, (comat-eqat)-2)
  15 }
  16
  17 function remove_brackets(b)
  18 {
  19     return substr(b, 2, length(b)-2)
  20 }
  21
  22 function splitdefine(l, p)
  23 {
  24     r = split(l, tp)
  25
  26     p[0] = tp[2]
  27     p[1] = remove_brackets(tp[3])
  28 }
  29
  30 function find_length(f)
  31 {
  32     if (0)
  33         printf "find_length " f "\n" > "/dev/stderr"
  34
  35     if (f ~ /0x1/)
  36         return 1
  37     else if (f ~ /0x3/)
  38         return 2
  39     else if (f ~ /0x7/)
  40         return 3
  41     else if (f ~ /0xf/)
  42         return 4
  43
  44     printf "unknown length " f "\n" > "/dev/stderr"
  45     exit
  46 }
  47
  48 function find_shift(s)
  49 {
  50     id = index(s, "<")
  51     if (id <= 0) {
  52         printf "cannot find shift " s "\n" > "/dev/stderr"
  53         exit
  54     }
  55
  56     return substr(s, id+2)
  57 }
  58
  59
  60 BEGIN {
  61     if (ARGC < 2) {
  62         print "too few arguments" > "/dev/stderr"
  63         exit
  64     }
  65
  66 # read the header file and find the mask values that we will need
  67 # to replace and create an associative array of values
  68
  69     while (getline line < ARGV[1] > 0) {
  70         if (line ~ /\#define.*_MASK/ &&
  71             !(line ~ /USB_SIG_MASK/)) {
  72             splitdefine(line, fields)
  73             name = fields[0]
  74             if (0)
  75                 printf "MASK " line "\n" > "/dev/stderr"
  76             dmask[name,0] = find_length(fields[1])
  77             dmask[name,1] = find_shift(fields[1])
  78             if (0)
  79                 printf "=> '" name "' LENGTH=" dmask[name,0] " SHIFT=" dmask[name,1] "\n" > "/dev/stderr"
  80         } else {
  81         }
  82     }
  83
  84     delete ARGV[1]
  85 }
  86
  87 /clksrc_clk.*=.*{/ {
  88     shift=""
  89     mask=""
  90     divshift=""
  91     reg_div=""
  92     reg_src=""
  93     indent=1
  94
  95     print $0
  96
  97     for(; indent >= 1;) {
  98         if ((getline line) <= 0) {
  99             printf "unexpected end of file" > "/dev/stderr"
 100             exit 1;
 101         }
 102
 103         if (line ~ /\.shift/) {
 104             shift = extract_value(line)
 105         } else if (line ~ /\.mask/) {
 106             mask = extract_value(line)
 107         } else if (line ~ /\.reg_divider/) {
 108             reg_div = extract_value(line)
 109         } else if (line ~ /\.reg_source/) {
 110             reg_src = extract_value(line)
 111         } else if (line ~ /\.divider_shift/) {
 112             divshift = extract_value(line)
 113         } else if (line ~ /{/) {
 114                 indent++
 115                 print line
 116             } else if (line ~ /}/) {
 117             indent--
 118
 119             if (indent == 0) {
 120                 if (0) {
 121                     printf "shift '" shift   "' ='" dmask[shift,0] "'\n" > "/dev/stderr"
 122                     printf "mask  '" mask    "'\n" > "/dev/stderr"
 123                     printf "dshft '" divshift "'\n" > "/dev/stderr"
 124                     printf "rdiv  '" reg_div "'\n" > "/dev/stderr"
 125                     printf "rsrc  '" reg_src "'\n" > "/dev/stderr"
 126                 }
 127
 128                 generated = mask
 129                 sub(reg_src, reg_div, generated)
 130
 131                 if (0) {
 132                     printf "/* rsrc " reg_src " */\n"
 133                     printf "/* rdiv " reg_div " */\n"
 134                     printf "/* shift " shift " */\n"
 135                     printf "/* mask " mask " */\n"
 136                     printf "/* generated " generated " */\n"
 137                 }
 138
 139                 if (reg_div != "") {
 140                     printf "\t.reg_div = { "
 141                     printf ".reg = " reg_div ", "
 142                     printf ".shift = " dmask[generated,1] ", "
 143                     printf ".size = " dmask[generated,0] ", "
 144                     printf "},\n"
 145                 }
 146
 147                 printf "\t.reg_src = { "
 148                 printf ".reg = " reg_src ", "
 149                 printf ".shift = " dmask[mask,1] ", "
 150                 printf ".size = " dmask[mask,0] ", "
 151
 152                 printf "},\n"
 153
 154             }
 155
 156             print line
 157         } else {
 158             print line
 159         }
 160
 161         if (0)
 162             printf indent ":" line "\n" > "/dev/stderr"
 163     }
 164 }
 165
 166 // && ! /clksrc_clk.*=.*{/ { print $0 }