mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-29 05:18:51 +09:00
187 lines
4.0 KiB
C
187 lines
4.0 KiB
C
/*
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* U-boot - serial.c Serial driver for BF537
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*
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* Copyright (c) 2005-2007 Analog Devices Inc.
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*
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* This file is based on
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* bf537_serial.c: Serial driver for BlackFin BF537 internal UART.
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* Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
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* BuyWays B.V. (www.buyways.nl)
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*
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* Based heavily on blkfinserial.c
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* blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
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* Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
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* Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
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* Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
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*
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* Based on code from 68328 version serial driver imlpementation which was:
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* Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
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* Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
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* Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
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* Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
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*
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* (C) Copyright 2000-2004
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <common.h>
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#include <asm/system.h>
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#include <asm/bitops.h>
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#include <asm/delay.h>
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#include <asm/io.h>
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#include "serial.h"
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#include <asm/mach-common/bits/uart.h>
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DECLARE_GLOBAL_DATA_PTR;
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unsigned long pll_div_fact;
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void calc_baud(void)
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{
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unsigned char i;
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int temp;
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u_long sclk = get_sclk();
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for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
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temp = sclk / (baud_table[i] * 8);
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if ((temp & 0x1) == 1) {
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temp++;
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}
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temp = temp / 2;
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hw_baud_table[i].dl_high = (temp >> 8) & 0xFF;
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hw_baud_table[i].dl_low = (temp) & 0xFF;
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}
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}
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void serial_setbrg(void)
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{
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int i;
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calc_baud();
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for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
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if (gd->baudrate == baud_table[i])
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break;
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}
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/* Enable UART */
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*pUART0_GCTL |= UCEN;
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SSYNC();
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/* Set DLAB in LCR to Access DLL and DLH */
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ACCESS_LATCH;
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SSYNC();
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*pUART0_DLL = hw_baud_table[i].dl_low;
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SSYNC();
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*pUART0_DLH = hw_baud_table[i].dl_high;
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SSYNC();
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/* Clear DLAB in LCR to Access THR RBR IER */
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ACCESS_PORT_IER;
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SSYNC();
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/* Enable ERBFI and ELSI interrupts
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* to poll SIC_ISR register*/
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*pUART0_IER = ELSI | ERBFI | ETBEI;
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SSYNC();
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/* Set LCR to Word Lengh 8-bit word select */
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*pUART0_LCR = WLS_8;
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SSYNC();
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return;
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}
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int serial_init(void)
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{
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serial_setbrg();
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return (0);
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}
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void serial_putc(const char c)
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{
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if ((*pUART0_LSR) & TEMT) {
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if (c == '\n')
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serial_putc('\r');
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local_put_char(c);
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}
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while (!((*pUART0_LSR) & TEMT))
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SYNC_ALL;
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return;
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}
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int serial_tstc(void)
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{
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if (*pUART0_LSR & DR)
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return 1;
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else
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return 0;
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}
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int serial_getc(void)
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{
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unsigned short uart_lsr_val, uart_rbr_val;
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unsigned long isr_val;
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int ret;
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/* Poll for RX Interrupt */
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while (!serial_tstc())
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continue;
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asm("csync;");
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uart_lsr_val = *pUART0_LSR; /* Clear status bit */
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uart_rbr_val = *pUART0_RBR; /* getc() */
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if (uart_lsr_val & (OE|PE|FE|BI)) {
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ret = -1;
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} else {
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ret = uart_rbr_val & 0xff;
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}
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return ret;
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}
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void serial_puts(const char *s)
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{
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while (*s) {
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serial_putc(*s++);
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}
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}
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static void local_put_char(char ch)
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{
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int flags = 0;
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unsigned long isr_val;
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/* Poll for TX Interruput */
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while (!(*pUART0_LSR & THRE))
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continue;
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asm("csync;");
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*pUART0_THR = ch; /* putc() */
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return;
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}
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