arch/arm/include/asm/hardware/debug-8250.S

   1 /*
   2  * arch/arm/include/asm/hardware/debug-8250.S
   3  *
   4  *  Copyright (C) 1994-2013 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 #ifdef CONFIG_DEBUG_UART_PHYS
  13                 .macro  addruart, rp, rv, tmp
  14                 ldr     \rp, =CONFIG_DEBUG_UART_PHYS
  15                 ldr     \rv, =CONFIG_DEBUG_UART_VIRT
  16                 .endm
  17 #endif
  18
  19 #ifndef UART_SHIFT
  20 #define UART_SHIFT CONFIG_DEBUG_UART_8250_SHIFT
  21 #endif
  22
  23                 .macro  senduart,rd,rx
  24                 strb    \rd, [\rx, #UART_TX << UART_SHIFT]
  25                 .endm
  26
  27                 .macro  busyuart,rd,rx
  28 1002:           ldrb    \rd, [\rx, #UART_LSR << UART_SHIFT]
  29                 and     \rd, \rd, #UART_LSR_TEMT | UART_LSR_THRE
  30                 teq     \rd, #UART_LSR_TEMT | UART_LSR_THRE
  31                 bne     1002b
  32                 .endm
  33
  34                 .macro  waituart,rd,rx
  35 #ifdef CONFIG_DEBUG_UART_8250_FLOW_CONTROL
  36 1001:           ldrb    \rd, [\rx, #UART_MSR << UART_SHIFT]
  37                 tst     \rd, #UART_MSR_CTS
  38                 beq     1001b
  39 #endif
  40                 .endm