arch/blackfin/lib/outs.S

   1 /*
   2  * Implementation of outs{bwl} for BlackFin processors using zero overhead loops.
   3  *
   4  * Copyright 2005-2009 Analog Devices Inc.
   5  *                2005 BuyWays BV
   6  *                      Bas Vermeulen <bas@buyways.nl>
   7  *
   8  * Licensed under the GPL-2.
   9  */
  10
  11 #include <linux/linkage.h>
  12
  13 .align 2
  14
  15 ENTRY(_outsl)
  16         CC = R2 == 0;
  17         IF CC JUMP 1f;
  18         P0 = R0;        /* P0 = port */
  19         P1 = R1;        /* P1 = address */
  20         P2 = R2;        /* P2 = count */
  21
  22         LSETUP( .Llong_loop_s, .Llong_loop_e) LC0 = P2;
  23 .Llong_loop_s: R0 = [P1++];
  24 .Llong_loop_e: [P0] = R0;
  25 1:      RTS;
  26 ENDPROC(_outsl)
  27
  28 ENTRY(_outsw)
  29         CC = R2 == 0;
  30         IF CC JUMP 1f;
  31         P0 = R0;        /* P0 = port */
  32         P1 = R1;        /* P1 = address */
  33         P2 = R2;        /* P2 = count */
  34
  35         LSETUP( .Lword_loop_s, .Lword_loop_e) LC0 = P2;
  36 .Lword_loop_s: R0 = W[P1++];
  37 .Lword_loop_e: W[P0] = R0;
  38 1:      RTS;
  39 ENDPROC(_outsw)
  40
  41 ENTRY(_outsb)
  42         CC = R2 == 0;
  43         IF CC JUMP 1f;
  44         P0 = R0;        /* P0 = port */
  45         P1 = R1;        /* P1 = address */
  46         P2 = R2;        /* P2 = count */
  47
  48         LSETUP( .Lbyte_loop_s, .Lbyte_loop_e) LC0 = P2;
  49 .Lbyte_loop_s: R0 = B[P1++];
  50 .Lbyte_loop_e: B[P0] = R0;
  51 1:      RTS;
  52 ENDPROC(_outsb)
  53
  54 ENTRY(_outsw_8)
  55         CC = R2 == 0;
  56         IF CC JUMP 1f;
  57         P0 = R0;        /* P0 = port */
  58         P1 = R1;        /* P1 = address */
  59         P2 = R2;        /* P2 = count */
  60
  61         LSETUP( .Lword8_loop_s, .Lword8_loop_e) LC0 = P2;
  62 .Lword8_loop_s: R1 = B[P1++];
  63                 R0 = B[P1++];
  64                 R0 = R0 << 8;
  65                 R0 = R0 + R1;
  66 .Lword8_loop_e: W[P0] = R0;
  67 1:      RTS;
  68 ENDPROC(_outsw_8)