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/*
* (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>
*
* (C) Copyright 2009-2010 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 <asm/arch/mx28.h>
#include <asm/arch/regs-uartdbg.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* Set baud rate. The settings are always 8n1:
* 8 data bits, no parity, 1 stop bit
*/
void serial_setbrg(void)
{
u32 cr;
u32 quot;
/* Disable everything */
cr = REG_RD(REGS_UARTDBG_BASE, HW_UARTDBGCR);
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGCR, 0);
/* Calculate and set baudrate */
quot = (CONFIG_DBGUART_CLK * 4) / gd->baudrate;
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGFBRD, quot & 0x3f);
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGIBRD, quot >> 6);
/* Set 8n1 mode, enable FIFOs */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGLCR_H,
BM_UARTDBGLCR_H_WLEN | BM_UARTDBGLCR_H_FEN);
/* Enable Debug UART */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGCR, cr);
}
int serial_init(void)
{
/* Disable UART */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGCR, 0);
/* Mask interrupts */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGIMSC, 0);
/* Set default baudrate */
serial_setbrg();
/* Enable UART */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGCR,
BM_UARTDBGCR_TXE | BM_UARTDBGCR_RXE | BM_UARTDBGCR_UARTEN);
return 0;
}
/* Send a character */
void serial_putc(const char c)
{
/* Wait for room in TX FIFO */
while (REG_RD(REGS_UARTDBG_BASE, HW_UARTDBGFR) & BM_UARTDBGFR_TXFF)
;
/* Write the data byte */
REG_WR(REGS_UARTDBG_BASE, HW_UARTDBGDR, c);
if (c == '\n')
serial_putc('\r');
}
void serial_puts(const char *s)
{
while (*s)
serial_putc(*s++);
}
/* Test whether a character is in TX buffer */
int serial_tstc(void)
{
/* Check if RX FIFO is not empty */
return !(REG_RD(REGS_UARTDBG_BASE, HW_UARTDBGFR) & BM_UARTDBGFR_RXFE);
}
/* Receive character */
int serial_getc(void)
{
/* Wait while TX FIFO is empty */
while (REG_RD(REGS_UARTDBG_BASE, HW_UARTDBGFR) & BM_UARTDBGFR_RXFE)
;
/* Read data byte */
return REG_RD(REGS_UARTDBG_BASE, HW_UARTDBGDR) & 0xff;
}
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