1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright (C) 2008-2010 Thomas Chou <thomas@wytron.com.tw>
4 */
5
6 #include <linux/io.h>
7
8 #if (defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE))\
9 || (defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE))
10 static void *my_ioremap(unsigned long physaddr)
11 {
12 return (void *)(physaddr | CONFIG_NIOS2_IO_REGION_BASE);
13 }
14 #endif
15
16 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE) && defined(JTAG_UART_BASE)
17
18 #define ALTERA_JTAGUART_SIZE 8
19 #define ALTERA_JTAGUART_DATA_REG 0
20 #define ALTERA_JTAGUART_CONTROL_REG 4
21 #define ALTERA_JTAGUART_CONTROL_AC_MSK (0x00000400)
22 #define ALTERA_JTAGUART_CONTROL_WSPACE_MSK (0xFFFF0000)
23 static void *uartbase;
24
25 #if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
26 static void jtag_putc(int ch)
27 {
28 if (readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
29 ALTERA_JTAGUART_CONTROL_WSPACE_MSK)
30 writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
31 }
32 #else
33 static void jtag_putc(int ch)
34 {
35 while ((readl(uartbase + ALTERA_JTAGUART_CONTROL_REG) &
36 ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0)
37 ;
38 writeb(ch, uartbase + ALTERA_JTAGUART_DATA_REG);
39 }
40 #endif
41
42 static int putchar(int ch)
43 {
44 jtag_putc(ch);
45 return ch;
46 }
47
48 static void console_init(void)
49 {
50 uartbase = my_ioremap((unsigned long) JTAG_UART_BASE);
51 writel(ALTERA_JTAGUART_CONTROL_AC_MSK,
52 uartbase + ALTERA_JTAGUART_CONTROL_REG);
53 }
54
55 #elif defined(CONFIG_SERIAL_ALTERA_UART_CONSOLE) && defined(UART0_BASE)
56
57 #define ALTERA_UART_SIZE 32
58 #define ALTERA_UART_TXDATA_REG 4
59 #define ALTERA_UART_STATUS_REG 8
60 #define ALTERA_UART_DIVISOR_REG 16
61 #define ALTERA_UART_STATUS_TRDY_MSK (0x40)
62 static unsigned uartbase;
63
64 static void uart_putc(int ch)
65 {
66 int i;
67
68 for (i = 0; (i < 0x10000); i++) {
69 if (readw(uartbase + ALTERA_UART_STATUS_REG) &
70 ALTERA_UART_STATUS_TRDY_MSK)
71 break;
72 }
73 writeb(ch, uartbase + ALTERA_UART_TXDATA_REG);
74 }
75
76 static int putchar(int ch)
77 {
78 uart_putc(ch);
79 if (ch == '\n')
80 uart_putc('\r');
81 return ch;
82 }
83
84 static void console_init(void)
85 {
86 unsigned int baud, baudclk;
87
88 uartbase = (unsigned long) my_ioremap((unsigned long) UART0_BASE);
89 baud = CONFIG_SERIAL_ALTERA_UART_BAUDRATE;
90 baudclk = UART0_FREQ / baud;
91 writew(baudclk, uartbase + ALTERA_UART_DIVISOR_REG);
92 }
93
94 #else
95
96 static int putchar(int ch)
97 {
98 return ch;
99 }
100
101 static void console_init(void)
102 {
103 }
104
105 #endif
106
107 static int puts(const char *s)
108 {
109 while (*s)
110 putchar(*s++);
111 return 0;
112 }
113
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