root/arch/arm/include/debug/meson.S

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2014 Carlo Caione
   4  * Carlo Caione <carlo@caione.org>
   5  */
   6 
   7 #define MESON_AO_UART_WFIFO             0x0
   8 #define MESON_AO_UART_STATUS            0xc
   9 
  10 #define MESON_AO_UART_TX_FIFO_EMPTY     (1 << 22)
  11 #define MESON_AO_UART_TX_FIFO_FULL      (1 << 21)
  12 
  13         .macro  addruart, rp, rv, tmp
  14         ldr     \rp, =(CONFIG_DEBUG_UART_PHYS)          @ physical
  15         ldr     \rv, =(CONFIG_DEBUG_UART_VIRT)          @ virtual
  16         .endm
  17 
  18         .macro  senduart,rd,rx
  19         str     \rd, [\rx, #MESON_AO_UART_WFIFO]
  20         .endm
  21 
  22         .macro  busyuart,rd,rx
  23 1002:   ldr     \rd, [\rx, #MESON_AO_UART_STATUS]
  24         tst     \rd, #MESON_AO_UART_TX_FIFO_EMPTY
  25         beq     1002b
  26         .endm
  27 
  28         .macro  waituart,rd,rx
  29 1001:   ldr     \rd, [\rx, #MESON_AO_UART_STATUS]
  30         tst     \rd, #MESON_AO_UART_TX_FIFO_FULL
  31         bne     1001b
  32         .endm