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   1 /* linux/include/asm-arm/plat-s3c/debug-macro.S
   2  *
   3  * Copyright 2005, 2007 Simtec Electronics
   4  *      http://armlinux.simtec.co.uk/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10 */
  11
  12 #include <asm/plat-s3c/regs-serial.h>
  13
  14 /* The S3C2440 implementations are used by default as they are the
  15  * most widely re-used */
  16
  17         .macro fifo_level_s3c2440 rd, rx
  18                 ldr     \rd, [ \rx, # S3C2410_UFSTAT ]
  19                 and     \rd, \rd, #S3C2440_UFSTAT_TXMASK
  20         .endm
  21
  22 #ifndef fifo_level
  23 #define fifo_level fifo_level_s3c2410
  24 #endif
  25
  26         .macro  fifo_full_s3c2440 rd, rx
  27                 ldr     \rd, [ \rx, # S3C2410_UFSTAT ]
  28                 tst     \rd, #S3C2440_UFSTAT_TXFULL
  29         .endm
  30
  31 #ifndef fifo_full
  32 #define fifo_full fifo_full_s3c2440
  33 #endif
  34
  35         .macro  senduart,rd,rx
  36                 strb    \rd, [\rx, # S3C2410_UTXH ]
  37         .endm
  38
  39         .macro  busyuart, rd, rx
  40                 ldr     \rd, [ \rx, # S3C2410_UFCON ]
  41                 tst     \rd, #S3C2410_UFCON_FIFOMODE    @ fifo enabled?
  42                 beq     1001f                           @
  43                 @ FIFO enabled...
  44 1003:
  45                 fifo_full \rd, \rx
  46                 bne     1003b
  47                 b       1002f
  48
  49 1001:
  50                 @ busy waiting for non fifo
  51                 ldr     \rd, [ \rx, # S3C2410_UTRSTAT ]
  52                 tst     \rd, #S3C2410_UTRSTAT_TXFE
  53                 beq     1001b
  54
  55 1002:           @ exit busyuart
  56         .endm
  57
  58         .macro  waituart,rd,rx
  59                 ldr     \rd, [ \rx, # S3C2410_UFCON ]
  60                 tst     \rd, #S3C2410_UFCON_FIFOMODE    @ fifo enabled?
  61                 beq     1001f                           @
  62                 @ FIFO enabled...
  63 1003:
  64                 fifo_level \rd, \rx
  65                 teq     \rd, #0
  66                 bne     1003b
  67                 b       1002f
  68 1001:
  69                 @ idle waiting for non fifo
  70                 ldr     \rd, [ \rx, # S3C2410_UTRSTAT ]
  71                 tst     \rd, #S3C2410_UTRSTAT_TXFE
  72                 beq     1001b
  73
  74 1002:           @ exit busyuart
  75         .endm