[susieq] Update qib_genbits.pl to handle SusieQ definitions

The latest RTL-generated register lists include (mostly redundant)
xxx_MSB values alongside xxx_LSB and xxx_RMASK, and also include
default register values.

src/drivers/infiniband/qib_genbits.pl

 use warnings;
 
 my $offsets = {};
+my $defaults = {};
 my $structures = {};
 my $structure = "";
 
   if ( /^\#define (\S+)_OFFS (\S+)$/ ) {
     $structure = $1;
     $offsets->{$structure} = $2;
+  } elsif ( /^\#define ${structure}_DEF (\S+)$/ ) {
+    $defaults->{$structure} = $1;
   } elsif ( /^\#define ${structure}_(\S+)_LSB (\S+)$/ ) {
     $structures->{$structure}->{$1}->{LSB} = $2;
+  } elsif ( /^\#define ${structure}_(\S+)_MSB (\S+)$/ ) {
+    $structures->{$structure}->{$1}->{MSB} = $2;
   } elsif ( /^\#define ${structure}_(\S+)_RMASK (\S+)$/ ) {
     $structures->{$structure}->{$1}->{RMASK} = $2;
   } elsif ( /^\s*$/ ) {
   }
 }
 
-my $data = [ map { { name => $_, offset => $offsets->{$_} }; }
+my $data = [ map { { name => $_, offset => $offsets->{$_},
+		     default => $defaults->{$_} }; }
 	     sort { hex ( $offsets->{$a} ) <=> hex ( $offsets->{$b} ) }
 	     keys %$offsets ];
 
   next unless exists $structures->{$datum->{name}};
   $structure = $structures->{$datum->{name}};
   my $fields = [ map { { name => $_, lsb => $structure->{$_}->{LSB},
+			 msb => $structure->{$_}->{MSB},
 			 rmask => $structure->{$_}->{RMASK} }; }
 		 sort { hex ( $structure->{$a}->{LSB} ) <=>
 			    hex ( $structure->{$b}->{LSB} ) }
   $datum->{fields} = $fields;
 }
 
-print "\n/* This file has been further processed by $0 */\n\n"
+print "\n/* This file has been further processed by $0 */\n\n";
 print "FILE_LICENCE ( GPL2_ONLY );\n\n";
 
 foreach my $datum ( @$data ) {
     printf "struct %s_pb {\n", $datum->{name};
     foreach my $field ( @{$datum->{fields}} ) {
       my $pad_width = ( hex ( $field->{lsb} ) - $lsb );
-      die "Inconsistent LSB/RMASK in $datum->{name}\n" if $pad_width < 0;
+      die "Inconsistent LSB/RMASK in $datum->{name} before $field->{name}\n"
+	  if $pad_width < 0;
       printf "\tpseudo_bit_t _unused_%u[%u];\n", $reserved_idx++, $pad_width
 	  if $pad_width;
+      $lsb += $pad_width;
       # Damn Perl can't cope with 64-bit hex constants
       my $width = 0;
+      die "Missing RMASK in $datum->{name}.$field->{name}\n"
+	  unless defined $field->{rmask};
       my $rmask = $field->{rmask};
       while ( $rmask =~ /^(0x.+)f$/i ) {
 	$width += 4;
 	$width++;
 	$rmask >>= 1;
       }
+      if ( defined $field->{msb} ) {
+	my $msb_width = ( hex ( $field->{msb} ) - $lsb + 1 );
+	$width ||= $msb_width;
+	die "Inconsistent LSB/MSB/RMASK in $datum->{name}.$field->{name}\n"
+	    unless $width == $msb_width;
+      }
       printf "\tpseudo_bit_t %s[%u];\n", $field->{name}, $width;
       $lsb += $width;
     }
     my $pad_width = ( 64 - $lsb );
-    die "Inconsistent LSB/RMASK in $datum->{name}\n" if $pad_width < 0;
+    die "Inconsistent LSB/RMASK in $datum->{name} final field\n"
+	if $pad_width < 0;
     printf "\tpseudo_bit_t _unused_%u[%u];\n", $reserved_idx++, $pad_width
 	if $pad_width;
     printf "};\n";
     printf "struct %s {\n\tPSEUDO_BIT_STRUCT ( struct %s_pb );\n};\n",
 	$datum->{name}, $datum->{name};
   }
+  printf "/* Default value: %s */\n", $datum->{default}
+      if defined $datum->{default};
   print "\n";
 }