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   1 /*
   2  * arch/arm/include/asm/hardware/debug-8250.S
   3  *
   4  *  Copyright (C) 1994-1999 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/serial_reg.h>
  11
  12                 .macro  senduart,rd,rx
  13                 strb    \rd, [\rx, #UART_TX << UART_SHIFT]
  14                 .endm
  15
  16                 .macro  busyuart,rd,rx
  17 1002:           ldrb    \rd, [\rx, #UART_LSR << UART_SHIFT]
  18                 and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
  19                 teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
  20                 bne     1002b
  21                 .endm
  22
  23                 .macro  waituart,rd,rx
  24 #ifdef FLOW_CONTROL
  25 1001:           ldrb    \rd, [\rx, #UART_MSR << UART_SHIFT]
  26                 tst     \rd, #UART_MSR_CTS
  27                 beq     1001b
  28 #endif
  29                 .endm