mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 17:58:23 +00:00
188 lines
4 KiB
C
188 lines
4 KiB
C
/*
|
|
* U-boot - serial.c Serial driver for BF561
|
|
*
|
|
* Copyright (c) 2005-2007 Analog Devices Inc.
|
|
*
|
|
* This file is based on
|
|
* bf533_serial.c: Serial driver for BlackFin BF533 DSP internal UART.
|
|
* Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
|
|
* BuyWays B.V. (www.buyways.nl)
|
|
*
|
|
* Based heavily on blkfinserial.c
|
|
* blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
|
|
* Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
|
|
* Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
|
|
* Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
|
|
*
|
|
* Based on code from 68328 version serial driver imlpementation which was:
|
|
* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
|
|
* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
|
|
* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
|
|
* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
|
|
*
|
|
* (C) Copyright 2000-2004
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* 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., 51 Franklin St, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/system.h>
|
|
#include <asm/bitops.h>
|
|
#include <asm/delay.h>
|
|
#include "serial.h"
|
|
#include <asm/io.h>
|
|
#include <asm/mach-common/bits/uart.h>
|
|
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
unsigned long pll_div_fact;
|
|
|
|
void calc_baud(void)
|
|
{
|
|
unsigned char i;
|
|
int temp;
|
|
u_long sclk = get_sclk();
|
|
|
|
for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
|
|
temp = sclk / (baud_table[i] * 8);
|
|
if ((temp & 0x1) == 1) {
|
|
temp++;
|
|
}
|
|
temp = temp / 2;
|
|
hw_baud_table[i].dl_high = (temp >> 8) & 0xFF;
|
|
hw_baud_table[i].dl_low = (temp) & 0xFF;
|
|
}
|
|
}
|
|
|
|
void serial_setbrg(void)
|
|
{
|
|
int i;
|
|
|
|
calc_baud();
|
|
|
|
for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
|
|
if (gd->baudrate == baud_table[i])
|
|
break;
|
|
}
|
|
|
|
/* Enable UART */
|
|
*pUART_GCTL |= UCEN;
|
|
SSYNC();
|
|
|
|
/* Set DLAB in LCR to Access DLL and DLH */
|
|
ACCESS_LATCH;
|
|
SSYNC();
|
|
|
|
*pUART_DLL = hw_baud_table[i].dl_low;
|
|
SSYNC();
|
|
*pUART_DLH = hw_baud_table[i].dl_high;
|
|
SSYNC();
|
|
|
|
/* Clear DLAB in LCR to Access THR RBR IER */
|
|
ACCESS_PORT_IER;
|
|
SSYNC();
|
|
|
|
/*
|
|
* Enable ERBFI and ELSI interrupts
|
|
* to poll SIC_ISR register
|
|
*/
|
|
*pUART_IER = ELSI | ERBFI | ETBEI;
|
|
SSYNC();
|
|
|
|
/* Set LCR to Word Lengh 8-bit word select */
|
|
*pUART_LCR = WLS_8;
|
|
SSYNC();
|
|
|
|
return;
|
|
}
|
|
|
|
int serial_init(void)
|
|
{
|
|
serial_setbrg();
|
|
return (0);
|
|
}
|
|
|
|
void serial_putc(const char c)
|
|
{
|
|
if ((*pUART_LSR) & TEMT) {
|
|
if (c == '\n')
|
|
serial_putc('\r');
|
|
|
|
local_put_char(c);
|
|
}
|
|
|
|
while (!((*pUART_LSR) & TEMT))
|
|
SYNC_ALL;
|
|
|
|
return;
|
|
}
|
|
|
|
int serial_tstc(void)
|
|
{
|
|
if (*pUART_LSR & DR)
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
int serial_getc(void)
|
|
{
|
|
unsigned short uart_lsr_val, uart_rbr_val;
|
|
unsigned long isr_val;
|
|
int ret;
|
|
|
|
/* Poll for RX Interrupt */
|
|
while (!serial_tstc())
|
|
continue;
|
|
asm("csync;");
|
|
|
|
uart_lsr_val = *pUART_LSR; /* Clear status bit */
|
|
uart_rbr_val = *pUART_RBR; /* getc() */
|
|
|
|
if (uart_lsr_val & (OE|PE|FE|BI)) {
|
|
ret = -1;
|
|
} else {
|
|
ret = uart_rbr_val & 0xff;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void serial_puts(const char *s)
|
|
{
|
|
while (*s) {
|
|
serial_putc(*s++);
|
|
}
|
|
}
|
|
|
|
static void local_put_char(char ch)
|
|
{
|
|
int flags = 0;
|
|
unsigned long isr_val;
|
|
|
|
/* Poll for TX Interruput */
|
|
while (!(*pUART_LSR & THRE))
|
|
continue;
|
|
asm("csync;");
|
|
|
|
*pUART_THR = ch; /* putc() */
|
|
|
|
return;
|
|
}
|