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f39748ae WD |
1 | /* |
2 | * (C) Copyright 2002 | |
792a09eb | 3 | * Gary Jennejohn, DENX Software Engineering, <garyj@denx.de> |
f39748ae WD |
4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <common.h> | |
22 | #include <lh7a40x.h> | |
23 | ||
d87080b7 WD |
24 | DECLARE_GLOBAL_DATA_PTR; |
25 | ||
f39748ae WD |
26 | #if defined(CONFIG_CONSOLE_UART1) |
27 | # define UART_CONSOLE 1 | |
28 | #elif defined(CONFIG_CONSOLE_UART2) | |
29 | # define UART_CONSOLE 2 | |
30 | #elif defined(CONFIG_CONSOLE_UART3) | |
31 | # define UART_CONSOLE 3 | |
32 | #else | |
33 | # error "No console configured ... " | |
34 | #endif | |
35 | ||
36 | void serial_setbrg (void) | |
37 | { | |
f832d8a1 | 38 | lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); |
f39748ae WD |
39 | int i; |
40 | unsigned int reg = 0; | |
41 | ||
42 | /* | |
43 | * userguide 15.1.2.4 | |
44 | * | |
45 | * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1 | |
46 | * | |
47 | * UART_REF_FREQ = external system clock input / 2 (Hz) | |
48 | * BAUD is desired baudrate (bits/s) | |
49 | * | |
50 | * NOTE: we add (divisor/2) to numerator to round for | |
51 | * more precision | |
52 | */ | |
53 | reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1; | |
54 | uart->brcon = reg; | |
55 | ||
56 | for (i = 0; i < 100; i++); | |
57 | } | |
58 | ||
59 | /* | |
60 | * Initialise the serial port with the given baudrate. The settings | |
61 | * are always 8 data bits, no parity, 1 stop bit, no start bits. | |
62 | * | |
63 | */ | |
64 | int serial_init (void) | |
65 | { | |
f832d8a1 | 66 | lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); |
f39748ae WD |
67 | |
68 | /* UART must be enabled before writing to any config registers */ | |
69 | uart->con |= (UART_EN); | |
70 | ||
71 | #ifdef CONFIG_CONSOLE_UART1 | |
72 | /* infrared disabled */ | |
73 | uart->con |= UART_SIRD; | |
74 | #endif | |
75 | /* loopback disabled */ | |
76 | uart->con &= ~(UART_LBE); | |
77 | ||
78 | /* modem lines and tx/rx polarities */ | |
79 | uart->con &= ~(UART_MXP | UART_TXP | UART_RXP); | |
80 | ||
81 | /* FIFO enable, N81 */ | |
82 | uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1); | |
83 | ||
84 | /* set baudrate */ | |
85 | serial_setbrg (); | |
86 | ||
87 | /* enable rx interrupt */ | |
88 | uart->inten |= UART_RI; | |
89 | ||
90 | return (0); | |
91 | } | |
92 | ||
93 | /* | |
94 | * Read a single byte from the serial port. Returns 1 on success, 0 | |
95 | * otherwise. When the function is succesfull, the character read is | |
96 | * written into its argument c. | |
97 | */ | |
98 | int serial_getc (void) | |
99 | { | |
f832d8a1 | 100 | lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); |
f39748ae WD |
101 | |
102 | /* wait for character to arrive */ | |
103 | while (uart->status & UART_RXFE); | |
104 | ||
105 | return(uart->data & 0xff); | |
106 | } | |
107 | ||
108 | #ifdef CONFIG_HWFLOW | |
109 | static int hwflow = 0; /* turned off by default */ | |
110 | int hwflow_onoff(int on) | |
111 | { | |
112 | switch(on) { | |
113 | case 0: | |
114 | default: | |
115 | break; /* return current */ | |
116 | case 1: | |
117 | hwflow = 1; /* turn on */ | |
118 | break; | |
119 | case -1: | |
120 | hwflow = 0; /* turn off */ | |
121 | break; | |
122 | } | |
123 | return hwflow; | |
124 | } | |
125 | #endif | |
126 | ||
127 | #ifdef CONFIG_MODEM_SUPPORT | |
128 | static int be_quiet = 0; | |
129 | void disable_putc(void) | |
130 | { | |
131 | be_quiet = 1; | |
132 | } | |
133 | ||
134 | void enable_putc(void) | |
135 | { | |
136 | be_quiet = 0; | |
137 | } | |
138 | #endif | |
139 | ||
140 | ||
141 | /* | |
142 | * Output a single byte to the serial port. | |
143 | */ | |
144 | void serial_putc (const char c) | |
145 | { | |
f832d8a1 | 146 | lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); |
f39748ae WD |
147 | |
148 | #ifdef CONFIG_MODEM_SUPPORT | |
149 | if (be_quiet) | |
150 | return; | |
151 | #endif | |
152 | ||
153 | /* wait for room in the tx FIFO */ | |
154 | while (!(uart->status & UART_TXFE)); | |
155 | ||
156 | #ifdef CONFIG_HWFLOW | |
157 | /* Wait for CTS up */ | |
158 | while(hwflow && !(uart->status & UART_CTS)); | |
159 | #endif | |
160 | ||
161 | uart->data = c; | |
162 | ||
163 | /* If \n, also do \r */ | |
164 | if (c == '\n') | |
165 | serial_putc ('\r'); | |
166 | } | |
167 | ||
168 | /* | |
169 | * Test whether a character is in the RX buffer | |
170 | */ | |
171 | int serial_tstc (void) | |
172 | { | |
f832d8a1 | 173 | lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE); |
f39748ae WD |
174 | |
175 | return(!(uart->status & UART_RXFE)); | |
176 | } | |
177 | ||
178 | void | |
179 | serial_puts (const char *s) | |
180 | { | |
181 | while (*s) { | |
182 | serial_putc (*s++); | |
183 | } | |
184 | } |