1 /*
2  *  Copyright (C) 2008-2010 Thomas Chou <thomas@wytron.com.tw>
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, see <http://www.gnu.org/licenses/>.
16  *
17  */
18 
19 #include <linux/io.h>
20 
21 #if (defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE))\
22 	|| (defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE))
23 static void *my_ioremap(unsigned long physaddr)
24 {
25 	return (void *)(physaddr | CONFIG_NIOS2_IO_REGION_BASE);
26 }
27 #endif
28 
29 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE)
30 
31 #define ALTERA_JTAGUART_SIZE				8
32 #define ALTERA_JTAGUART_DATA_REG			0
33 #define ALTERA_JTAGUART_CONTROL_REG			4
34 #define ALTERA_JTAGUART_CONTROL_AC_MSK			(0x00000400)
35 #define ALTERA_JTAGUART_CONTROL_WSPACE_MSK		(0xFFFF0000)
36 static void *uartbase;
37 
38 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
39 static void jtag_putc(int ch)
40 {
41 	if (readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
42 		ALTERA_JTAGUART_CONTROL_WSPACE_MSK)
43 		writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
44 }
45 #else
46 static void jtag_putc(int ch)
47 {
48 	while ((readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
49 		ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0)
50 		;
51 	writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
52 }
53 #endif
54 
55 static int putchar(int ch)
56 {
57 	jtag_putc(ch);
58 	return ch;
59 }
60 
61 static void console_init(void)
62 {
63 	uartbase = my_ioremap((unsigned long) JTAG_UART_BASE);
64 	writel(ALTERA_JTAGUART_CONTROL_AC_MSK,
65 		uartbase + ALTERA_JTAGUART_CONTROL_REG);
66 }
67 
68 #elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE)
69 
70 #define ALTERA_UART_SIZE		32
71 #define ALTERA_UART_TXDATA_REG		4
72 #define ALTERA_UART_STATUS_REG		8
73 #define ALTERA_UART_DIVISOR_REG		16
74 #define ALTERA_UART_STATUS_TRDY_MSK	(0x40)
75 static unsigned uartbase;
76 
77 static void uart_putc(int ch)
78 {
79 	int i;
80 
81 	for (i = 0; (i < 0x10000); i++) {
82 		if (readw(uartbase + ALTERA_UART_STATUS_REG) &
83 			ALTERA_UART_STATUS_TRDY_MSK)
84 			break;
85 	}
86 	writeb(ch, uartbase + ALTERA_UART_TXDATA_REG);
87 }
88 
89 static int putchar(int ch)
90 {
91 	uart_putc(ch);
92 	if (ch == '\n')
93 		uart_putc('\r');
94 	return ch;
95 }
96 
97 static void console_init(void)
98 {
99 	unsigned int baud, baudclk;
100 
101 	uartbase = (unsigned long) my_ioremap((unsigned long) UART0_BASE);
102 	baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
103 	baudclk = UART0_FREQ / baud;
104 	writew(baudclk, uartbase + ALTERA_UART_DIVISOR_REG);
105 }
106 
107 #else
108 
109 static int putchar(int ch)
110 {
111 	return ch;
112 }
113 
114 static void console_init(void)
115 {
116 }
117 
118 #endif
119 
120 static int puts(const char *s)
121 {
122 	while (*s)
123 		putchar(*s++);
124 	return 0;
125 }
126