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/*
* Copyright 2012 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <common.h>
#include <watchdog.h>
#include <asm/io.h>
#include <asm/arch/vybrid-regs.h>
#include <asm/arch/serial-vybrid.h>
#include <asm/arch/clock.h>
#ifndef CONFIG_VYBRID_UART_BASE
#error "define CONFIG_VYBRID_UART_BASE to use the VYBRID UART driver"
#endif
#define UART_CONSOLE \
(CONFIG_VYBRID_UART_BASE + (CONFIG_SYS_UART_PORT * 0x1000))
#ifdef CONFIG_SERIAL_MULTI
#warning "Vybrid driver does not support MULTI serials."
#endif
DECLARE_GLOBAL_DATA_PTR;
void serial_setbrg(void)
{
u32 clk = vybrid_get_uartclk();
u16 sbr;
if (!gd->baudrate)
gd->baudrate = CONFIG_BAUDRATE;
sbr = (u16)(clk / (16 * gd->baudrate));
/* place adjustment later - n/32 BRFA */
out_8((UART_CONSOLE + UBDH), (sbr >> 8));
out_8((UART_CONSOLE + UBDL), (sbr & 0xFF));
}
int serial_getc(void)
{
while (!(in_8(UART_CONSOLE + US1) & US1_RDRF))
WATCHDOG_RESET();
setbits_8((UART_CONSOLE + US1), US1_RDRF);
return in_8(UART_CONSOLE + UD);
}
void serial_putc(const char c)
{
if (c == '\n')
serial_putc('\r');
while (!(in_8(UART_CONSOLE + US1) & US1_TDRE))
WATCHDOG_RESET();
out_8((UART_CONSOLE + UD), c);
}
/*
* Test whether a character is in the RX buffer
*/
int serial_tstc(void)
{
if (in_8(UART_CONSOLE + URCFIFO) == 0)
return 0;
return 1;
}
void
serial_puts(const char *s)
{
while (*s)
serial_putc(*s++);
}
/*
* Initialise the serial port with the given baudrate. The settings
* are always 8 data bits, no parity, 1 stop bit, no start bits.
*/
int serial_init(void)
{
clrbits_8((UART_CONSOLE + UC2), UC2_RE);
clrbits_8((UART_CONSOLE + UC2), UC2_TE);
out_8((UART_CONSOLE + UMODEM), 0);
out_8((UART_CONSOLE + UC1), 0);
/* provide data bits, parity, stop bit, etc */
serial_setbrg();
out_8((UART_CONSOLE + UC2), (UC2_RE | UC2_TE));
return 0;
}
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