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3a574cbe WD |
1 | /* |
2 | * serial.c -- KS8695 serial driver | |
3 | * | |
4 | * (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | */ | |
20 | ||
21 | #include <common.h> | |
22 | #include <asm/arch/platform.h> | |
23 | ||
24 | #ifndef CONFIG_SERIAL1 | |
25 | #error "Bad: you didn't configure serial ..." | |
26 | #endif | |
27 | ||
d87080b7 WD |
28 | DECLARE_GLOBAL_DATA_PTR; |
29 | ||
3a574cbe WD |
30 | /* |
31 | * Define the UART hardware register access structure. | |
32 | */ | |
33 | struct ks8695uart { | |
34 | unsigned int RX; /* 0x00 - Receive data (r) */ | |
35 | unsigned int TX; /* 0x04 - Transmit data (w) */ | |
36 | unsigned int FCR; /* 0x08 - Fifo Control (r/w) */ | |
37 | unsigned int LCR; /* 0x0c - Line Control (r/w) */ | |
38 | unsigned int MCR; /* 0x10 - Modem Control (r/w) */ | |
39 | unsigned int LSR; /* 0x14 - Line Status (r/w) */ | |
40 | unsigned int MSR; /* 0x18 - Modem Status (r/w) */ | |
41 | unsigned int BD; /* 0x1c - Baud Rate (r/w) */ | |
42 | unsigned int SR; /* 0x20 - Status (r/w) */ | |
43 | }; | |
44 | ||
45 | #define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER)) | |
46 | #define KS8695_UART_CLK 25000000 | |
47 | ||
48 | ||
49 | /* | |
50 | * Under some circumstances we want to be "quiet" and not issue any | |
51 | * serial output - though we want u-boot to otherwise work and behave | |
52 | * the same. By default be noisy. | |
53 | */ | |
54 | int serial_console = 1; | |
55 | ||
56 | ||
57 | void serial_setbrg(void) | |
58 | { | |
3a574cbe WD |
59 | volatile struct ks8695uart *uartp = KS8695_UART_ADDR; |
60 | ||
61 | /* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/ | |
62 | uartp->BD = KS8695_UART_CLK / gd->baudrate; | |
63 | uartp->LCR = KS8695_UART_LINEC_WLEN8; | |
64 | } | |
65 | ||
66 | int serial_init(void) | |
67 | { | |
68 | serial_console = 1; | |
69 | serial_setbrg(); | |
70 | return 0; | |
71 | } | |
72 | ||
73 | void serial_raw_putc(const char c) | |
74 | { | |
75 | volatile struct ks8695uart *uartp = KS8695_UART_ADDR; | |
76 | int i; | |
77 | ||
78 | for (i = 0; (i < 0x100000); i++) { | |
79 | if (uartp->LSR & KS8695_UART_LINES_TXFE) | |
80 | break; | |
81 | } | |
82 | ||
83 | uartp->TX = c; | |
84 | } | |
85 | ||
86 | void serial_putc(const char c) | |
87 | { | |
88 | if (serial_console) { | |
89 | serial_raw_putc(c); | |
90 | if (c == '\n') | |
91 | serial_raw_putc('\r'); | |
92 | } | |
93 | } | |
94 | ||
95 | int serial_tstc(void) | |
96 | { | |
97 | volatile struct ks8695uart *uartp = KS8695_UART_ADDR; | |
98 | if (serial_console) | |
99 | return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0); | |
100 | return 0; | |
101 | } | |
102 | ||
103 | void serial_puts(const char *s) | |
104 | { | |
105 | char c; | |
106 | while ((c = *s++) != 0) | |
107 | serial_putc(c); | |
108 | } | |
109 | ||
110 | int serial_getc(void) | |
111 | { | |
112 | volatile struct ks8695uart *uartp = KS8695_UART_ADDR; | |
113 | ||
114 | while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0) | |
115 | ; | |
116 | return (uartp->RX); | |
117 | } |