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Wolfgang Denkf93ae782006-10-24 14:31:24 +02001/*
2 * Copyright (C) 2004-2006 Atmel Corporation
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18#include <common.h>
19
20#ifdef CONFIG_ATMEL_USART
21#include <asm/io.h>
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010022#include <asm/arch/clk.h>
23#include <asm/arch/memory-map.h>
24
25#if defined(CONFIG_USART0)
26# define USART_ID 0
27# define USART_BASE USART0_BASE
28#elif defined(CONFIG_USART1)
29# define USART_ID 1
30# define USART_BASE USART1_BASE
31#elif defined(CONFIG_USART2)
32# define USART_ID 2
33# define USART_BASE USART2_BASE
34#elif defined(CONFIG_USART3)
35# define USART_ID 3
36# define USART_BASE USART3_BASE
37#endif
Wolfgang Denkf93ae782006-10-24 14:31:24 +020038
39#include "atmel_usart.h"
40
41DECLARE_GLOBAL_DATA_PTR;
42
43void serial_setbrg(void)
44{
45 unsigned long divisor;
46 unsigned long usart_hz;
47
48 /*
49 * Master Clock
50 * Baud Rate = --------------
51 * 16 * CD
52 */
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010053 usart_hz = get_usart_clk_rate(USART_ID);
Wolfgang Denkf93ae782006-10-24 14:31:24 +020054 divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010055 usart3_writel(BRGR, USART3_BF(CD, divisor));
Wolfgang Denkf93ae782006-10-24 14:31:24 +020056}
57
58int serial_init(void)
59{
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010060 usart3_writel(CR, USART3_BIT(RSTRX) | USART3_BIT(RSTTX));
Wolfgang Denkf93ae782006-10-24 14:31:24 +020061
62 serial_setbrg();
63
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010064 usart3_writel(CR, USART3_BIT(RXEN) | USART3_BIT(TXEN));
65 usart3_writel(MR, (USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
66 | USART3_BF(USCLKS, USART3_USCLKS_MCK)
67 | USART3_BF(CHRL, USART3_CHRL_8)
68 | USART3_BF(PAR, USART3_PAR_NONE)
69 | USART3_BF(NBSTOP, USART3_NBSTOP_1)));
Wolfgang Denkf93ae782006-10-24 14:31:24 +020070
71 return 0;
72}
73
74void serial_putc(char c)
75{
76 if (c == '\n')
77 serial_putc('\r');
78
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010079 while (!(usart3_readl(CSR) & USART3_BIT(TXRDY))) ;
80 usart3_writel(THR, c);
Wolfgang Denkf93ae782006-10-24 14:31:24 +020081}
82
83void serial_puts(const char *s)
84{
85 while (*s)
86 serial_putc(*s++);
87}
88
89int serial_getc(void)
90{
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010091 while (!(usart3_readl(CSR) & USART3_BIT(RXRDY))) ;
92 return usart3_readl(RHR);
Wolfgang Denkf93ae782006-10-24 14:31:24 +020093}
94
95int serial_tstc(void)
96{
Haavard Skinnemoendf548d32006-11-19 18:06:53 +010097 return (usart3_readl(CSR) & USART3_BIT(RXRDY)) != 0;
Wolfgang Denkf93ae782006-10-24 14:31:24 +020098}
99
100#endif /* CONFIG_ATMEL_USART */