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26bf7dec AL |
1 | /* |
2 | * U-boot - serial.c Serial driver for BF537 | |
3 | * | |
155fd766 | 4 | * Copyright (c) 2005-2007 Analog Devices Inc. |
26bf7dec AL |
5 | * |
6 | * This file is based on | |
7 | * bf537_serial.c: Serial driver for BlackFin BF537 internal UART. | |
8 | * Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>, | |
9 | * BuyWays B.V. (www.buyways.nl) | |
10 | * | |
11 | * Based heavily on blkfinserial.c | |
12 | * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs. | |
13 | * Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com> | |
14 | * Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com> | |
15 | * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com> | |
16 | * | |
17 | * Based on code from 68328 version serial driver imlpementation which was: | |
18 | * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu> | |
19 | * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com> | |
20 | * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org> | |
21 | * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com> | |
22 | * | |
23 | * (C) Copyright 2000-2004 | |
24 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
25 | * | |
26 | * See file CREDITS for list of people who contributed to this | |
27 | * project. | |
28 | * | |
29 | * This program is free software; you can redistribute it and/or | |
30 | * modify it under the terms of the GNU General Public License as | |
31 | * published by the Free Software Foundation; either version 2 of | |
32 | * the License, or (at your option) any later version. | |
33 | * | |
34 | * This program is distributed in the hope that it will be useful, | |
35 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
37 | * GNU General Public License for more details. | |
38 | * | |
39 | * You should have received a copy of the GNU General Public License | |
40 | * along with this program; if not, write to the Free Software | |
155fd766 AL |
41 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, |
42 | * MA 02110-1301 USA | |
26bf7dec AL |
43 | */ |
44 | ||
45 | #include <common.h> | |
46 | #include <asm/irq.h> | |
47 | #include <asm/system.h> | |
48 | #include <asm/segment.h> | |
49 | #include <asm/bitops.h> | |
50 | #include <asm/delay.h> | |
51 | #include <asm/uaccess.h> | |
52 | #include <asm/io.h> | |
53 | #include "serial.h" | |
54 | ||
55 | unsigned long pll_div_fact; | |
56 | ||
57 | void calc_baud(void) | |
58 | { | |
59 | unsigned char i; | |
60 | int temp; | |
61 | u_long sclk = get_sclk(); | |
62 | ||
63 | for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) { | |
64 | temp = sclk / (baud_table[i] * 8); | |
65 | if ((temp & 0x1) == 1) { | |
66 | temp++; | |
67 | } | |
68 | temp = temp / 2; | |
69 | hw_baud_table[i].dl_high = (temp >> 8) & 0xFF; | |
70 | hw_baud_table[i].dl_low = (temp) & 0xFF; | |
71 | } | |
72 | } | |
73 | ||
74 | void serial_setbrg(void) | |
75 | { | |
76 | int i; | |
77 | DECLARE_GLOBAL_DATA_PTR; | |
78 | ||
79 | calc_baud(); | |
80 | ||
81 | for (i = 0; i < sizeof(baud_table) / sizeof(int); i++) { | |
82 | if (gd->baudrate == baud_table[i]) | |
83 | break; | |
84 | } | |
85 | ||
86 | /* Enable UART */ | |
87 | *pUART_GCTL |= UART_GCTL_UCEN; | |
88 | sync(); | |
89 | ||
90 | /* Set DLAB in LCR to Access DLL and DLH */ | |
91 | ACCESS_LATCH; | |
92 | sync(); | |
93 | ||
94 | *pUART_DLL = hw_baud_table[i].dl_low; | |
95 | sync(); | |
96 | *pUART_DLH = hw_baud_table[i].dl_high; | |
97 | sync(); | |
98 | ||
99 | /* Clear DLAB in LCR to Access THR RBR IER */ | |
100 | ACCESS_PORT_IER; | |
101 | sync(); | |
102 | ||
103 | /* Enable ERBFI and ELSI interrupts | |
104 | * to poll SIC_ISR register*/ | |
105 | *pUART_IER = UART_IER_ELSI | UART_IER_ERBFI | UART_IER_ETBEI; | |
106 | sync(); | |
107 | ||
108 | /* Set LCR to Word Lengh 8-bit word select */ | |
109 | *pUART_LCR = UART_LCR_WLS8; | |
110 | sync(); | |
111 | ||
112 | return; | |
113 | } | |
114 | ||
115 | int serial_init(void) | |
116 | { | |
117 | serial_setbrg(); | |
118 | return (0); | |
119 | } | |
120 | ||
121 | void serial_putc(const char c) | |
122 | { | |
123 | if ((*pUART_LSR) & UART_LSR_TEMT) { | |
124 | if (c == '\n') | |
125 | serial_putc('\r'); | |
126 | ||
127 | local_put_char(c); | |
128 | } | |
129 | ||
130 | while (!((*pUART_LSR) & UART_LSR_TEMT)) | |
131 | SYNC_ALL; | |
132 | ||
133 | return; | |
134 | } | |
135 | ||
136 | int serial_tstc(void) | |
137 | { | |
138 | if (*pUART_LSR & UART_LSR_DR) | |
139 | return 1; | |
140 | else | |
141 | return 0; | |
142 | } | |
143 | ||
144 | int serial_getc(void) | |
145 | { | |
146 | unsigned short uart_lsr_val, uart_rbr_val; | |
147 | unsigned long isr_val; | |
148 | int ret; | |
149 | ||
150 | /* Poll for RX Interrupt */ | |
151 | while (!((isr_val = | |
152 | *(volatile unsigned long *)SIC_ISR) & IRQ_UART_RX_BIT)) ; | |
153 | asm("csync;"); | |
154 | ||
155 | uart_lsr_val = *pUART_LSR; /* Clear status bit */ | |
156 | uart_rbr_val = *pUART_RBR; /* getc() */ | |
157 | ||
158 | if (isr_val & IRQ_UART_ERROR_BIT) { | |
159 | ret = -1; | |
160 | } else { | |
161 | ret = uart_rbr_val & 0xff; | |
162 | } | |
163 | ||
164 | return ret; | |
165 | } | |
166 | ||
167 | void serial_puts(const char *s) | |
168 | { | |
169 | while (*s) { | |
170 | serial_putc(*s++); | |
171 | } | |
172 | } | |
173 | ||
174 | static void local_put_char(char ch) | |
175 | { | |
176 | int flags = 0; | |
177 | unsigned long isr_val; | |
178 | ||
179 | save_and_cli(flags); | |
180 | ||
181 | /* Poll for TX Interruput */ | |
182 | while (!((isr_val = *pSIC_ISR) & IRQ_UART_TX_BIT)) ; | |
183 | asm("csync;"); | |
184 | ||
185 | *pUART_THR = ch; /* putc() */ | |
186 | ||
187 | if (isr_val & IRQ_UART_ERROR_BIT) { | |
188 | printf("?"); | |
189 | } | |
190 | ||
191 | restore_flags(flags); | |
192 | ||
193 | return; | |
194 | } |