arch/arm/include/debug/efm32.S

   1 /*
   2  * Copyright (C) 2013 Pengutronix
   3  * Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #define UARTn_CMD               0x000c
  11 #define UARTn_CMD_TXEN                  0x0004
  12
  13 #define UARTn_STATUS            0x0010
  14 #define UARTn_STATUS_TXC                0x0020
  15 #define UARTn_STATUS_TXBL               0x0040
  16
  17 #define UARTn_TXDATA            0x0034
  18
  19                 .macro  addruart, rx, tmp, tmp2
  20                 ldr     \rx, =(CONFIG_DEBUG_UART_PHYS)
  21
  22                 /*
  23                  * enable TX. The driver might disable it to save energy. We
  24                  * don't care about disabling at the end as during debug power
  25                  * consumption isn't that important.
  26                  */
  27                 ldr     \tmp, =(UARTn_CMD_TXEN)
  28                 str     \tmp, [\rx, #UARTn_CMD]
  29                 .endm
  30
  31                 .macro  senduart,rd,rx
  32                 strb    \rd, [\rx, #UARTn_TXDATA]
  33                 .endm
  34
  35                 .macro  waituart,rd,rx
  36 1001:           ldr     \rd, [\rx, #UARTn_STATUS]
  37                 tst     \rd, #UARTn_STATUS_TXBL
  38                 beq     1001b
  39                 .endm
  40
  41                 .macro  busyuart,rd,rx
  42 1001:           ldr     \rd, [\rx, UARTn_STATUS]
  43                 tst     \rd, #UARTn_STATUS_TXC
  44                 bne     1001b
  45                 .endm