include/asm-arm/arch-sa1100/debug-macro.S

   1 /* linux/include/asm-arm/arch-sa1100/debug-macro.S
   2  *
   3  * Debugging macro include header
   4  *
   5  *  Copyright (C) 1994-1999 Russell King
   6  *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12 */
  13 #include <asm/hardware.h>
  14
  15                 .macro  addruart,rx
  16                 mrc     p15, 0, \rx, c1, c0
  17                 tst     \rx, #1                 @ MMU enabled?
  18                 moveq   \rx, #0x80000000        @ physical base address
  19                 movne   \rx, #0xf8000000        @ virtual address
  20
  21                 @ We probe for the active serial port here, coherently with
  22                 @ the comment in include/asm-arm/arch-sa1100/uncompress.h.
  23                 @ We assume r1 can be clobbered.
  24
  25                 @ see if Ser3 is active
  26                 add     \rx, \rx, #0x00050000
  27                 ldr     r1, [\rx, #UTCR3]
  28                 tst     r1, #UTCR3_TXE
  29
  30                 @ if Ser3 is inactive, then try Ser1
  31                 addeq   \rx, \rx, #(0x00010000 - 0x00050000)
  32                 ldreq   r1, [\rx, #UTCR3]
  33                 tsteq   r1, #UTCR3_TXE
  34
  35                 @ if Ser1 is inactive, then try Ser2
  36                 addeq   \rx, \rx, #(0x00030000 - 0x00010000)
  37                 ldreq   r1, [\rx, #UTCR3]
  38                 tsteq   r1, #UTCR3_TXE
  39
  40                 @ if all ports are inactive, then there is nothing we can do
  41                 moveq   pc, lr
  42                 .endm
  43
  44                 .macro  senduart,rd,rx
  45                 str     \rd, [\rx, #UTDR]
  46                 .endm
  47
  48                 .macro  waituart,rd,rx
  49 1001:           ldr     \rd, [\rx, #UTSR1]
  50                 tst     \rd, #UTSR1_TNF
  51                 beq     1001b
  52                 .endm
  53
  54                 .macro  busyuart,rd,rx
  55 1001:           ldr     \rd, [\rx, #UTSR1]
  56                 tst     \rd, #UTSR1_TBY
  57                 bne     1001b
  58                 .endm