5113f6f70
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kernel add
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/*
*
* Copyright (C) 2007 Google, Inc.
* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
* Author: Brian Swetland <swetland@google.com>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
.macro addruart, rp, rv, tmp
ldr \rp, =CONFIG_DEBUG_UART_PHYS
ldr \rv, =CONFIG_DEBUG_UART_VIRT
.endm
.macro senduart, rd, rx
ARM_BE8(rev \rd, \rd )
@ Write the 1 character to UARTDM_TF
str \rd, [\rx, #0x70]
.endm
.macro waituart, 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_ISR
1001: ldr \rd, [\rx, #0x14]
ARM_BE8(rev \rd, \rd )
tst \rd, #0x80
beq 1001b
1002:
@ Clear TX_READY by writing to the UARTDM_CR register
mov \rd, #0x300
ARM_BE8(rev \rd, \rd )
str \rd, [\rx, #0x10]
@ Write 0x1 to NCF register
mov \rd, #0x1
ARM_BE8(rev \rd, \rd )
str \rd, [\rx, #0x40]
@ UARTDM reg. Read to induce delay
ldr \rd, [\rx, #0x08]
.endm
.macro busyuart, rd, rx
.endm
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