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Aubrey Li26bf7de2007-03-19 01:24:52 +08001/*
2 * U-boot - serial.c Serial driver for BF537
3 *
Aubrey Li155fd762007-04-05 18:31:18 +08004 * Copyright (c) 2005-2007 Analog Devices Inc.
Aubrey Li26bf7de2007-03-19 01:24:52 +08005 *
6 * This file is based on
7 * bf537_serial.c: Serial driver for BlackFin BF537 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>
16 *
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>
22 *
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 Li155fd762007-04-05 18:31:18 +080041 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
42 * MA 02110-1301 USA
Aubrey Li26bf7de2007-03-19 01:24:52 +080043 */
44
45#include <common.h>
46#include <asm/irq.h>
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>
52#include <asm/io.h>
53#include "serial.h"
54
55unsigned long pll_div_fact;
56
57void calc_baud(void)
58{
59 unsigned char i;
60 int temp;
61 u_long sclk = get_sclk();
62
63 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
64 temp = sclk / (baud_table[i] * 8);
65 if ((temp & 0x1) == 1) {
66 temp++;
67 }
68 temp = temp / 2;
69 hw_baud_table[i].dl_high = (temp >> 8) & 0xFF;
70 hw_baud_table[i].dl_low = (temp) & 0xFF;
71 }
72}
73
74void serial_setbrg(void)
75{
76 int i;
77 DECLARE_GLOBAL_DATA_PTR;
78
79 calc_baud();
80
81 for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) {
82 if (gd->baudrate == baud_table[i])
83 break;
84 }
85
86 /* Enable UART */
87 *pUART_GCTL |= UART_GCTL_UCEN;
88 sync();
89
90 /* Set DLAB in LCR to Access DLL and DLH */
91 ACCESS_LATCH;
92 sync();
93
94 *pUART_DLL = hw_baud_table[i].dl_low;
95 sync();
96 *pUART_DLH = hw_baud_table[i].dl_high;
97 sync();
98
99 /* Clear DLAB in LCR to Access THR RBR IER */
100 ACCESS_PORT_IER;
101 sync();
102
103 /* Enable ERBFI and ELSI interrupts
104 * to poll SIC_ISR register*/
105 *pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI;
106 sync();
107
108 /* Set LCR to Word Lengh 8-bit word select */
109 *pUART_LCR = UART_LCR_WLS8;
110 sync();
111
112 return;
113}
114
115int serial_init(void)
116{
117 serial_setbrg();
118 return (0);
119}
120
121void serial_putc(const char c)
122{
123 if ((*pUART_LSR) & UART_LSR_TEMT) {
124 if (c == '\n')
125 serial_putc('\r');
126
127 local_put_char(c);
128 }
129
130 while (!((*pUART_LSR) & UART_LSR_TEMT))
131 SYNC_ALL;
132
133 return;
134}
135
136int serial_tstc(void)
137{
138 if (*pUART_LSR & UART_LSR_DR)
139 return 1;
140 else
141 return 0;
142}
143
144int serial_getc(void)
145{
146 unsigned short uart_lsr_val, uart_rbr_val;
147 unsigned long isr_val;
148 int ret;
149
150 /* Poll for RX Interrupt */
151 while (!((isr_val =
152 *(volatile unsigned long *)SIC_ISR) & IRQ_UART_RX_BIT)) ;
153 asm("csync;");
154
155 uart_lsr_val = *pUART_LSR; /* Clear status bit */
156 uart_rbr_val = *pUART_RBR; /* getc() */
157
158 if (isr_val & IRQ_UART_ERROR_BIT) {
159 ret = -1;
160 } else {
161 ret = uart_rbr_val & 0xff;
162 }
163
164 return ret;
165}
166
167void serial_puts(const char *s)
168{
169 while (*s) {
170 serial_putc(*s++);
171 }
172}
173
174static void local_put_char(char ch)
175{
176 int flags = 0;
177 unsigned long isr_val;
178
179 save_and_cli(flags);
180
181 /* Poll for TX Interruput */
182 while (!((isr_val = *pSIC_ISR) & IRQ_UART_TX_BIT)) ;
183 asm("csync;");
184
185 *pUART_THR = ch; /* putc() */
186
187 if (isr_val & IRQ_UART_ERROR_BIT) {
188 printf("?");
189 }
190
191 restore_flags(flags);
192
193 return;
194}