2 * U-boot - serial.c Serial driver for BF561
4 * Copyright (c) 2005 blackfin.uclinux.org
6 * This file is based on
7 * bf533_serial.c: Serial driver for BlackFin BF533 DSP internal UART.
8 * Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
9 * BuyWays B.V. (www.buyways.nl)
11 * Based heavily on blkfinserial.c
12 * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
13 * Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
14 * Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
15 * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
17 * Based on code from 68328 version serial driver imlpementation which was:
18 * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
19 * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
20 * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
21 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
23 * (C) Copyright 2000-2004
24 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
26 * See file CREDITS for list of people who contributed to this
29 * This program is free software; you can redistribute it and/or
30 * modify it under the terms of the GNU General Public License as
31 * published by the Free Software Foundation; either version 2 of
32 * the License, or (at your option) any later version.
34 * This program is distributed in the hope that it will be useful,
35 * but WITHOUT ANY WARRANTY; without even the implied warranty of
36 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
37 * GNU General Public License for more details.
39 * You should have received a copy of the GNU General Public License
40 * along with this program; if not, write to the Free Software
41 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
47 #include <asm/system.h>
48 #include <asm/segment.h>
49 #include <asm/bitops.h>
50 #include <asm/delay.h>
51 #include <asm/uaccess.h>
55 unsigned long pll_div_fact;
61 u_long sclk = get_sclk();
63 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
64 temp = sclk / (baud_table[i] * 8);
65 if ((temp & 0x1) == 1) {
69 hw_baud_table[i].dl_high = (temp >> 8) & 0xFF;
70 hw_baud_table[i].dl_low = (temp) & 0xFF;
74 void serial_setbrg(void)
77 DECLARE_GLOBAL_DATA_PTR;
81 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
82 if (gd->baudrate == baud_table[i])
87 *pUART_GCTL |= UART_GCTL_UCEN;
90 /* Set DLAB in LCR to Access DLL and DLH */
94 *pUART_DLL = hw_baud_table[i].dl_low;
96 *pUART_DLH = hw_baud_table[i].dl_high;
99 /* Clear DLAB in LCR to Access THR RBR IER */
104 * Enable ERBFI and ELSI interrupts
105 * to poll SIC_ISR register
107 *pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI;
110 /* Set LCR to Word Lengh 8-bit word select */
111 *pUART_LCR = UART_LCR_WLS8;
117 int serial_init(void)
123 void serial_putc(const char c)
125 if ((*pUART_LSR) & UART_LSR_TEMT) {
132 while (!((*pUART_LSR) & UART_LSR_TEMT))
138 int serial_tstc(void)
140 if (*pUART_LSR & UART_LSR_DR)
146 int serial_getc(void)
148 unsigned short uart_lsr_val, uart_rbr_val;
149 unsigned long isr_val;
152 /* Poll for RX Interrupt */
154 *(volatile unsigned long *)SIC_ISR) & IRQ_UART_RX_BIT)) ;
157 uart_lsr_val = *pUART_LSR; /* Clear status bit */
158 uart_rbr_val = *pUART_RBR; /* getc() */
160 if (isr_val & IRQ_UART_ERROR_BIT) {
163 ret = uart_rbr_val & 0xff;
169 void serial_puts(const char *s)
176 static void local_put_char(char ch)
179 unsigned long isr_val;
183 /* Poll for TX Interruput */
184 while (!((isr_val = *pSIC_ISR) & IRQ_UART_TX_BIT)) ;
187 *pUART_THR = ch; /* putc() */
189 if (isr_val & IRQ_UART_ERROR_BIT) {
193 restore_flags(flags);