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 <asm/assembler.h>
  15 #include "imx-uart.h"
  16
  17 /*
  18  * FIXME: This is a copy of IMX_IO_P2V in hardware.h, and needs to
  19  * stay sync with that.  It's hard to maintain, and should be fixed
  20  * globally for multi-platform build to use a fixed virtual address
  21  * for low-level debug uart port across platforms.
  22  */
  23 #define IMX_IO_P2V(x)   (                                               \
  24                         (((x) & 0x80000000) >> 7) |                     \
  25                         (0xf4000000 +                                   \
  26                         (((x) & 0x50000000) >> 6) +                     \
  27                         (((x) & 0x0b000000) >> 4) +                     \
  28                         (((x) & 0x000fffff))))
  29
  30 #define UART_VADDR      IMX_IO_P2V(UART_PADDR)
  31
  32                 .macro  addruart, rp, rv, tmp
  33                 ldr     \rp, =UART_PADDR        @ physical
  34                 ldr     \rv, =UART_VADDR        @ virtual
  35                 .endm
  36
  37                 .macro  senduart,rd,rx
  38                 ARM_BE8(rev \rd, \rd)
  39                 str     \rd, [\rx, #0x40]       @ TXDATA
  40                 .endm
  41
  42                 .macro  waituart,rd,rx
  43                 .endm
  44
  45                 .macro  busyuart,rd,rx
  46 1002:           ldr     \rd, [\rx, #0x98]       @ SR2
  47                 ARM_BE8(rev \rd, \rd)
  48                 tst     \rd, #1 << 3            @ TXDC
  49                 beq     1002b                   @ wait until transmit done
  50                 .endm