1 /* SPDX-License-Identifier: GPL-2.0-only */
4 * Copyright (C) 2007 Google, Inc.
5 * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
6 * Author: Brian Swetland <swetland@google.com>
9 .macro addruart, rp, rv, tmp
10 ldr \rp, =CONFIG_DEBUG_UART_PHYS
11 ldr \rv, =CONFIG_DEBUG_UART_VIRT
14 .macro senduart, rd, rx
15 ARM_BE8(rev \rd, \rd )
16 @ Write the 1 character to UARTDM_TF
20 .macro waituart, rd, rx
21 @ check for TX_EMT in UARTDM_SR
23 ARM_BE8(rev \rd, \rd )
26 @ wait for TXREADY in UARTDM_ISR
27 1001: ldr \rd, [\rx, #0x14]
28 ARM_BE8(rev \rd, \rd )
32 @ Clear TX_READY by writing to the UARTDM_CR register
34 ARM_BE8(rev \rd, \rd )
36 @ Write 0x1 to NCF register
38 ARM_BE8(rev \rd, \rd )
40 @ UARTDM reg. Read to induce delay
44 .macro busyuart, rd, rx