142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/*
|
|
* Jz47xx UART support
|
|
*
|
|
* Hardcoded to UART 0 for now
|
|
* Options also hardcoded to 8N1
|
|
*
|
|
* Copyright (c) 2005
|
|
* Ingenic Semiconductor, <jlwei@ingenic.cn>
|
|
*
|
|
* 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 <config.h>
|
|
|
|
#if defined(CONFIG_JZ4740)
|
|
|
|
#include <common.h>
|
|
|
|
#include <asm/jz4740.h>
|
|
|
|
#undef UART_BASE
|
|
#ifndef CONFIG_SYS_UART_BASE
|
|
#define UART_BASE UART0_BASE
|
|
#else
|
|
#define UART_BASE CONFIG_SYS_UART_BASE
|
|
#endif
|
|
|
|
/******************************************************************************
|
|
*
|
|
* serial_init - initialize a channel
|
|
*
|
|
* This routine initializes the number of data bits, parity
|
|
* and set the selected baud rate. Interrupts are disabled.
|
|
* Set the modem control signals if the option is selected.
|
|
*
|
|
* RETURNS: N/A
|
|
*/
|
|
|
|
int serial_init (void)
|
|
{
|
|
#if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL)
|
|
volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR);
|
|
volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
|
|
volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER);
|
|
volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR);
|
|
|
|
/* Disable port interrupts while changing hardware */
|
|
*uart_ier = 0;
|
|
|
|
/* Disable UART unit function */
|
|
*uart_fcr = ~UART_FCR_UUE;
|
|
|
|
/* Set both receiver and transmitter in UART mode (not SIR) */
|
|
*uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE);
|
|
|
|
/* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */
|
|
*uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1;
|
|
|
|
/* Set baud rate */
|
|
serial_setbrg();
|
|
|
|
/* Enable UART unit, enable and clear FIFO */
|
|
*uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
void serial_setbrg (void)
|
|
{
|
|
volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR);
|
|
volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR);
|
|
volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR);
|
|
u32 baud_div, tmp;
|
|
|
|
baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE;
|
|
|
|
tmp = *uart_lcr;
|
|
tmp |= UART_LCR_DLAB;
|
|
*uart_lcr = tmp;
|
|
|
|
*uart_dlhr = (baud_div >> 8) & 0xff;
|
|
*uart_dllr = baud_div & 0xff;
|
|
|
|
tmp &= ~UART_LCR_DLAB;
|
|
*uart_lcr = tmp;
|
|
}
|
|
|
|
void serial_putc (const char c)
|
|
{
|
|
volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);
|
|
volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR);
|
|
|
|
if (c == '\n') serial_putc ('\r');
|
|
|
|
/* Wait for fifo to shift out some bytes */
|
|
while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) );
|
|
|
|
*uart_tdr = (u8)c;
|
|
}
|
|
|
|
void serial_puts (const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc (*s++);
|
|
}
|
|
}
|
|
|
|
int serial_getc (void)
|
|
{
|
|
volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR);
|
|
|
|
while (!serial_tstc());
|
|
|
|
return *uart_rdr;
|
|
}
|
|
|
|
int serial_tstc (void)
|
|
{
|
|
volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR);
|
|
|
|
if (*uart_lsr & UART_LSR_DR) {
|
|
/* Data in rfifo */
|
|
return (1);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#endif
|