arch/arm/include/debug/imx.S

   1 /* arch/arm/mach-imx/include/mach/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
  14 #include "imx-uart.h"
  15
  16 /*
  17  * FIXME: This is a copy of IMX_IO_P2V in hardware.h, and needs to
  18  * stay sync with that.  It's hard to maintain, and should be fixed
  19  * globally for multi-platform build to use a fixed virtual address
  20  * for low-level debug uart port across platforms.
  21  */
  22 #define IMX_IO_P2V(x)   (                                               \
  23                         (((x) & 0x80000000) >> 7) |                     \
  24                         (0xf4000000 +                                   \
  25                         (((x) & 0x50000000) >> 6) +                     \
  26                         (((x) & 0x0b000000) >> 4) +                     \
  27                         (((x) & 0x000fffff))))
  28
  29 #define UART_VADDR      IMX_IO_P2V(UART_PADDR)
  30
  31                 .macro  addruart, rp, rv, tmp
  32                 ldr     \rp, =UART_PADDR        @ physical
  33                 ldr     \rv, =UART_VADDR        @ virtual
  34                 .endm
  35
  36                 .macro  senduart,rd,rx
  37                 str     \rd, [\rx, #0x40]       @ TXDATA
  38                 .endm
  39
  40                 .macro  waituart,rd,rx
  41                 .endm
  42
  43                 .macro  busyuart,rd,rx
  44 1002:           ldr     \rd, [\rx, #0x98]       @ SR2
  45                 tst     \rd, #1 << 3            @ TXDC
  46                 beq     1002b                   @ wait until transmit done
  47                 .endm