/*
 * Copyright 2017 NXP
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of NXP nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <asm_macros.S>

#define UARTBAUD	0x10
#define UARTSTAT	0x14
#define UARTCTRL	0x18
#define UARTDATA	0x1C
#define UARTMATCH	0x20
#define UARTMODIR	0x24
#define UARTFIFO	0x28
#define UARTWATER	0x2c

#define US1_TDRE	(1 << 23)
#define US1_RDRF	(1 << 21)

	.globl	console_core_init
	.globl	console_core_putc
	.globl	console_core_getc
	.globl	console_core_flush

/* console_core_init */
func console_core_init
	mov	w0, wzr
	ret
endfunc console_core_init

/* console_core_putc */
func console_core_putc
	/* Check the input parameter */
	cbz	x1, putc_error
	/* Insert implementation here */
	/* Prepare '\r' to '\n' */
	cmp	w0, #0xA
	b.ne	2f
1:
	/* Check if the transmit FIFO is full */
	ldr	w2, [x1, #UARTSTAT]
	tbz	w2, #23, 1b
	mov	w2, #0xD
	str	w2, [x1, #UARTDATA]
2:
	/* Check if the transmit FIFO is full */
	ldr	w2, [x1, #UARTSTAT]
	tbz	w2, #23, 2b
	str	w0, [x1, #UARTDATA]
	ret
putc_error:
	mov	w0, #-1
	ret
endfunc console_core_putc

/* console_core_getc */
func console_core_getc
	cbz	x0, getc_error
	/* Insert implementation here */
	/* Check if the receive FIFO state */
	ret
getc_error:
	mov	w0, #-1
	ret
endfunc console_core_getc

/* console_core_flush */
func console_core_flush
	mov	w0, wzr
	ret
endfunc console_core_flush