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5c952cf0 WD |
1 | /* |
2 | * (C) Copyright 2004, Psyent Corporation <www.psyent.com> | |
3 | * Scott McNutt <smcnutt@psyent.com> | |
4 | * | |
5 | * See file CREDITS for list of people who contributed to this | |
6 | * project. | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License as | |
10 | * published by the Free Software Foundation; either version 2 of | |
11 | * the License, or (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
21 | * MA 02111-1307 USA | |
22 | */ | |
23 | ||
24 | ||
25 | #include <common.h> | |
26 | #include <watchdog.h> | |
c2ced000 | 27 | #include <asm/io.h> |
5c952cf0 WD |
28 | #include <nios2-io.h> |
29 | ||
d87080b7 WD |
30 | DECLARE_GLOBAL_DATA_PTR; |
31 | ||
5c952cf0 WD |
32 | /*------------------------------------------------------------------ |
33 | * JTAG acts as the serial port | |
34 | *-----------------------------------------------------------------*/ | |
35 | #if defined(CONFIG_CONSOLE_JTAG) | |
36 | ||
6d0f6bcf | 37 | static nios_jtag_t *jtag = (nios_jtag_t *)CONFIG_SYS_NIOS_CONSOLE; |
5c952cf0 WD |
38 | |
39 | void serial_setbrg( void ){ return; } | |
40 | int serial_init( void ) { return(0);} | |
41 | ||
42 | void serial_putc (char c) | |
43 | { | |
44 | unsigned val; | |
45 | ||
c2ced000 | 46 | while (NIOS_JTAG_WSPACE ( readl (&jtag->control)) == 0) |
5c952cf0 | 47 | WATCHDOG_RESET (); |
c2ced000 | 48 | writel (&jtag->data, (unsigned char)c); |
5c952cf0 WD |
49 | } |
50 | ||
51 | void serial_puts (const char *s) | |
52 | { | |
53 | while (*s != 0) | |
54 | serial_putc (*s++); | |
55 | } | |
56 | ||
57 | int serial_tstc (void) | |
58 | { | |
c2ced000 | 59 | return ( readl (&jtag->control) & NIOS_JTAG_RRDY); |
5c952cf0 WD |
60 | } |
61 | ||
62 | int serial_getc (void) | |
63 | { | |
64 | int c; | |
65 | unsigned val; | |
66 | ||
67 | while (1) { | |
68 | WATCHDOG_RESET (); | |
c2ced000 | 69 | val = readl (&jtag->data); |
5c952cf0 WD |
70 | if (val & NIOS_JTAG_RVALID) |
71 | break; | |
72 | } | |
73 | c = val & 0x0ff; | |
74 | return (c); | |
75 | } | |
76 | ||
77 | /*------------------------------------------------------------------ | |
78 | * UART the serial port | |
79 | *-----------------------------------------------------------------*/ | |
80 | #else | |
81 | ||
6d0f6bcf | 82 | static nios_uart_t *uart = (nios_uart_t *) CONFIG_SYS_NIOS_CONSOLE; |
5c952cf0 | 83 | |
6d0f6bcf | 84 | #if defined(CONFIG_SYS_NIOS_FIXEDBAUD) |
5c952cf0 WD |
85 | |
86 | /* Everything's already setup for fixed-baud PTF | |
87 | * assignment | |
88 | */ | |
89 | void serial_setbrg (void){ return; } | |
90 | int serial_init (void) { return (0);} | |
91 | ||
92 | #else | |
93 | ||
94 | void serial_setbrg (void) | |
95 | { | |
5c952cf0 WD |
96 | unsigned div; |
97 | ||
98 | div = (CONFIG_SYS_CLK_FREQ/gd->baudrate)-1; | |
c2ced000 | 99 | writel (&uart->divisor,div); |
5c952cf0 WD |
100 | return; |
101 | } | |
102 | ||
103 | int serial_init (void) | |
104 | { | |
105 | serial_setbrg (); | |
106 | return (0); | |
107 | } | |
108 | ||
6d0f6bcf | 109 | #endif /* CONFIG_SYS_NIOS_FIXEDBAUD */ |
5c952cf0 WD |
110 | |
111 | ||
112 | /*----------------------------------------------------------------------- | |
113 | * UART CONSOLE | |
114 | *---------------------------------------------------------------------*/ | |
115 | void serial_putc (char c) | |
116 | { | |
117 | if (c == '\n') | |
118 | serial_putc ('\r'); | |
c2ced000 | 119 | while ((readl (&uart->status) & NIOS_UART_TRDY) == 0) |
5c952cf0 | 120 | WATCHDOG_RESET (); |
c2ced000 | 121 | writel (&uart->txdata,(unsigned char)c); |
5c952cf0 WD |
122 | } |
123 | ||
124 | void serial_puts (const char *s) | |
125 | { | |
126 | while (*s != 0) { | |
127 | serial_putc (*s++); | |
128 | } | |
129 | } | |
130 | ||
131 | int serial_tstc (void) | |
132 | { | |
c2ced000 | 133 | return (readl (&uart->status) & NIOS_UART_RRDY); |
5c952cf0 WD |
134 | } |
135 | ||
136 | int serial_getc (void) | |
137 | { | |
138 | while (serial_tstc () == 0) | |
139 | WATCHDOG_RESET (); | |
c2ced000 | 140 | return (readl (&uart->rxdata) & 0x00ff ); |
5c952cf0 WD |
141 | } |
142 | ||
143 | #endif /* CONFIG_JTAG_CONSOLE */ |