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/*
* Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
*
* 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 ARM 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 <assert.h>
#include <console.h>
#include <pl011.h>
static unsigned long uart_base;
void console_init(unsigned long base_addr)
{
/* TODO: assert() internally calls printf() and will result in
* an infinite loop. This needs to be fixed with some kind of
* exception mechanism or early panic support. This also applies
* to the other assert() calls below.
*/
assert(base_addr);
/* Initialise internal base address variable */
uart_base = base_addr;
/* Baud Rate */
#if defined(PL011_INTEGER) && defined(PL011_FRACTIONAL)
pl011_write_ibrd(uart_base, PL011_INTEGER);
pl011_write_fbrd(uart_base, PL011_FRACTIONAL);
#else
pl011_setbaudrate(uart_base, PL011_BAUDRATE);
#endif
pl011_write_lcr_h(uart_base, PL011_LINE_CONTROL);
/* Clear any pending errors */
pl011_write_ecr(uart_base, 0);
/* Enable tx, rx, and uart overall */
pl011_write_cr(uart_base, PL011_UARTCR_RXE | PL011_UARTCR_TXE |
PL011_UARTCR_UARTEN);
}
#define WAIT_UNTIL_UART_FREE(base) \
while ((pl011_read_fr(base) & PL011_UARTFR_TXFF)) \
continue
int console_putc(int c)
{
assert(uart_base);
if (c == '\n') {
WAIT_UNTIL_UART_FREE(uart_base);
pl011_write_dr(uart_base, '\r');
}
WAIT_UNTIL_UART_FREE(uart_base);
pl011_write_dr(uart_base, c);
return c;
}
int console_getc(void)
{
assert(uart_base);
while ((pl011_read_fr(uart_base) & PL011_UARTFR_RXFE) != 0)
;
return pl011_read_dr(uart_base);
}
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