blob: 05fcfcccce657c73ff68f73dcc33cfdc76a884e8 [file] [log] [blame]
Wolfgang Denk97caf672006-03-12 02:12:27 +01001/*
2 * U-boot - serial.c Serial driver for BF533
3 *
Aubrey Li314d22f2007-04-05 18:31:18 +08004 * Copyright (c) 2005-2007 Analog Devices Inc.
Wolfgang Denk97caf672006-03-12 02:12:27 +01005 *
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)
10 *
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>
Wolfgang Denk2bad8682006-03-12 02:55:22 +010016 *
Wolfgang Denk97caf672006-03-12 02:12:27 +010017 * 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>
Wolfgang Denk2bad8682006-03-12 02:55:22 +010021 * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
Wolfgang Denk97caf672006-03-12 02:12:27 +010022 *
23 * (C) Copyright 2000-2004
24 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
25 *
26 * See file CREDITS for list of people who contributed to this
27 * project.
28 *
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.
33 *
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.
38 *
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
Aubrey Li314d22f2007-04-05 18:31:18 +080041 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
42 * MA 02110-1301 USA
Wolfgang Denk97caf672006-03-12 02:12:27 +010043 */
44
45#include <common.h>
Wolfgang Denk97caf672006-03-12 02:12:27 +010046#include <asm/system.h>
Wolfgang Denk97caf672006-03-12 02:12:27 +010047#include <asm/bitops.h>
48#include <asm/delay.h>
Aubrey Li3c569952007-03-12 00:25:14 +080049#include <asm/io.h>
Wolfgang Denk97caf672006-03-12 02:12:27 +010050#include "bf533_serial.h"
Mike Frysinger66c4cf42008-02-04 19:26:55 -050051#include <asm/mach-common/bits/uart.h>
Wolfgang Denk97caf672006-03-12 02:12:27 +010052
Aubrey Li3c569952007-03-12 00:25:14 +080053DECLARE_GLOBAL_DATA_PTR;
54
Wolfgang Denk97caf672006-03-12 02:12:27 +010055unsigned long pll_div_fact;
56
57void calc_baud(void)
58{
59 unsigned char i;
Aubrey.Li9da597f2007-03-09 13:38:44 +080060 int temp;
61 u_long sclk = get_sclk();
Wolfgang Denk97caf672006-03-12 02:12:27 +010062
Aubrey.Li9da597f2007-03-09 13:38:44 +080063 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
64 temp = sclk / (baud_table[i] * 8);
65 if ((temp & 0x1) == 1) {
Wolfgang Denk97caf672006-03-12 02:12:27 +010066 temp++;
67 }
Aubrey.Li9da597f2007-03-09 13:38:44 +080068 temp = temp / 2;
69 hw_baud_table[i].dl_high = (temp >> 8) & 0xFF;
Wolfgang Denk97caf672006-03-12 02:12:27 +010070 hw_baud_table[i].dl_low = (temp) & 0xFF;
71 }
72}
73
74void serial_setbrg(void)
75{
76 int i;
Wolfgang Denk97caf672006-03-12 02:12:27 +010077
78 calc_baud();
79
80 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
81 if (gd->baudrate == baud_table[i])
82 break;
83 }
84
85 /* Enable UART */
Mike Frysinger66c4cf42008-02-04 19:26:55 -050086 *pUART_GCTL |= UCEN;
87 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +010088
89 /* Set DLAB in LCR to Access DLL and DLH */
90 ACCESS_LATCH;
Mike Frysinger66c4cf42008-02-04 19:26:55 -050091 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +010092
93 *pUART_DLL = hw_baud_table[i].dl_low;
Mike Frysinger66c4cf42008-02-04 19:26:55 -050094 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +010095 *pUART_DLH = hw_baud_table[i].dl_high;
Mike Frysinger66c4cf42008-02-04 19:26:55 -050096 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +010097
98 /* Clear DLAB in LCR to Access THR RBR IER */
99 ACCESS_PORT_IER;
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500100 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +0100101
102 /* Enable ERBFI and ELSI interrupts
Aubrey.Li9da597f2007-03-09 13:38:44 +0800103 * to poll SIC_ISR register*/
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500104 *pUART_IER = ELSI | ERBFI | ETBEI;
105 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +0100106
107 /* Set LCR to Word Lengh 8-bit word select */
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500108 *pUART_LCR = WLS_8;
109 SSYNC();
Wolfgang Denk97caf672006-03-12 02:12:27 +0100110
111 return;
112}
113
114int serial_init(void)
115{
116 serial_setbrg();
117 return (0);
118}
119
120void serial_putc(const char c)
121{
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500122 if ((*pUART_LSR) & TEMT) {
Wolfgang Denk97caf672006-03-12 02:12:27 +0100123 if (c == '\n')
124 serial_putc('\r');
125
126 local_put_char(c);
127 }
128
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500129 while (!((*pUART_LSR) & TEMT))
Wolfgang Denk97caf672006-03-12 02:12:27 +0100130 SYNC_ALL;
131
132 return;
133}
134
135int serial_tstc(void)
136{
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500137 if (*pUART_LSR & DR)
Wolfgang Denk97caf672006-03-12 02:12:27 +0100138 return 1;
139 else
140 return 0;
141}
142
143int serial_getc(void)
144{
145 unsigned short uart_lsr_val, uart_rbr_val;
146 unsigned long isr_val;
147 int ret;
148
149 /* Poll for RX Interrupt */
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500150 while (!serial_tstc())
151 continue;
Wolfgang Denk97caf672006-03-12 02:12:27 +0100152 asm("csync;");
153
154 uart_lsr_val = *pUART_LSR; /* Clear status bit */
155 uart_rbr_val = *pUART_RBR; /* getc() */
156
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500157 if (uart_lsr_val & (OE|PE|FE|BI)) {
Aubrey.Li9da597f2007-03-09 13:38:44 +0800158 ret = -1;
159 } else {
Wolfgang Denk97caf672006-03-12 02:12:27 +0100160 ret = uart_rbr_val & 0xff;
161 }
162
163 return ret;
164}
165
166void serial_puts(const char *s)
167{
168 while (*s) {
169 serial_putc(*s++);
170 }
171}
172
173static void local_put_char(char ch)
174{
175 int flags = 0;
176 unsigned long isr_val;
177
Wolfgang Denk2bad8682006-03-12 02:55:22 +0100178 /* Poll for TX Interruput */
Mike Frysinger66c4cf42008-02-04 19:26:55 -0500179 while (!(*pUART_LSR & THRE))
180 continue;
Wolfgang Denk2bad8682006-03-12 02:55:22 +0100181 asm("csync;");
Wolfgang Denk97caf672006-03-12 02:12:27 +0100182
Aubrey.Li9da597f2007-03-09 13:38:44 +0800183 *pUART_THR = ch; /* putc() */
Wolfgang Denk97caf672006-03-12 02:12:27 +0100184
Aubrey.Li9da597f2007-03-09 13:38:44 +0800185 return;
Wolfgang Denk97caf672006-03-12 02:12:27 +0100186}