root/arch/arm/include/debug/bcm63xx.S

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   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Broadcom BCM63xx low-level UART debug
   4  *
   5  * Copyright (C) 2014 Broadcom Corporation
   6  */
   7 
   8 #include <linux/serial_bcm63xx.h>
   9 
  10         .macro  addruart, rp, rv, tmp
  11         ldr     \rp, =CONFIG_DEBUG_UART_PHYS
  12         ldr     \rv, =CONFIG_DEBUG_UART_VIRT
  13         .endm
  14 
  15         .macro  senduart, rd, rx
  16         /* word access do not work */
  17         strb    \rd, [\rx, #UART_FIFO_REG]
  18         .endm
  19 
  20         .macro  waituart, rd, rx
  21 1001:   ldr     \rd, [\rx, #UART_IR_REG]
  22         tst     \rd, #(1 << UART_IR_TXEMPTY)
  23         beq     1001b
  24         .endm
  25 
  26         .macro  busyuart, rd, rx
  27 1002:   ldr     \rd, [\rx, #UART_IR_REG]
  28         tst     \rd, #(1 << UART_IR_TXTRESH)
  29         beq     1002b
  30         .endm
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