arch/arm/include/debug/bcm63xx.S

   1 /*
   2  * Broadcom BCM63xx low-level UART debug
   3  *
   4  * Copyright (C) 2014 Broadcom Corporation
   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
  11 #include <linux/serial_bcm63xx.h>
  12
  13         .macro  addruart, rp, rv, tmp
  14         ldr     \rp, =CONFIG_DEBUG_UART_PHYS
  15         ldr     \rv, =CONFIG_DEBUG_UART_VIRT
  16         .endm
  17
  18         .macro  senduart, rd, rx
  19         /* word access do not work */
  20         strb    \rd, [\rx, #UART_FIFO_REG]
  21         .endm
  22
  23         .macro  waituart, rd, rx
  24 1001:   ldr     \rd, [\rx, #UART_IR_REG]
  25         tst     \rd, #(1 << UART_IR_TXEMPTY)
  26         beq     1001b
  27         .endm
  28
  29         .macro  busyuart, rd, rx
  30 1002:   ldr     \rd, [\rx, #UART_IR_REG]
  31         tst     \rd, #(1 << UART_IR_TXTRESH)
  32         beq     1002b
  33         .endm