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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849/* SPDX-License-Identifier: GPL-2.0-only *//* * * Copyright (C) 2007 Google, Inc. * Copyright (c) 2011, Code Aurora Forum. All rights reserved. * Author: Brian Swetland <swetland@google.com> */
.macro addruart, rp, rv, tmp ldr \rp, =CONFIG_DEBUG_UART_PHYS ldr \rv, =CONFIG_DEBUG_UART_VIRT .endm
.macro senduart, rd, rxARM_BE8(rev \rd, \rd ) @ Write the 1 character to UARTDM_TF str \rd, [\rx, #0x70] .endm
.macro waituartcts,rd,rx .endm
.macro waituarttxrdy, rd, rx @ check for TX_EMT in UARTDM_SR ldr \rd, [\rx, #0x08]ARM_BE8(rev \rd, \rd ) tst \rd, #0x08 bne 1002f @ wait for TXREADY in UARTDM_ISR1001: ldr \rd, [\rx, #0x14]ARM_BE8(rev \rd, \rd ) tst \rd, #0x80 beq 1001b1002: @ Clear TX_READY by writing to the UARTDM_CR register mov \rd, #0x300ARM_BE8(rev \rd, \rd ) str \rd, [\rx, #0x10] @ Write 0x1 to NCF register mov \rd, #0x1ARM_BE8(rev \rd, \rd ) str \rd, [\rx, #0x40] @ UARTDM reg. Read to induce delay ldr \rd, [\rx, #0x08] .endm
.macro busyuart, rd, rx .endm