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Source at commit b51c58b created 13 years 4 months ago. By Xiangfu Liu, this patch add uboot-xburst package uboot-xburst-avt2 uboot-xburst-n516 uboot-xburst-qi_lb60 uboot-xburst-sakc | |
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1 | /* |
2 | * Jz47xx UART support |
3 | * |
4 | * Hardcoded to UART 0 for now |
5 | * Options also hardcoded to 8N1 |
6 | * |
7 | * Copyright (c) 2005 |
8 | * Ingenic Semiconductor, <jlwei@ingenic.cn> |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License as |
12 | * published by the Free Software Foundation; either version 2 of |
13 | * the License, or (at your option) any later version. |
14 | * |
15 | * This program is distributed in the hope that it will be useful, |
16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
18 | * GNU General Public License for more details. |
19 | * |
20 | * You should have received a copy of the GNU General Public License |
21 | * along with this program; if not, write to the Free Software |
22 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
23 | * MA 02111-1307 USA |
24 | */ |
25 | |
26 | #include <config.h> |
27 | |
28 | #if defined(CONFIG_JZ4740) |
29 | |
30 | #include <common.h> |
31 | |
32 | #include <asm/jz4740.h> |
33 | |
34 | #undef UART_BASE |
35 | #ifndef CONFIG_SYS_UART_BASE |
36 | #define UART_BASE UART0_BASE |
37 | #else |
38 | #define UART_BASE CONFIG_SYS_UART_BASE |
39 | #endif |
40 | |
41 | /****************************************************************************** |
42 | * |
43 | * serial_init - initialize a channel |
44 | * |
45 | * This routine initializes the number of data bits, parity |
46 | * and set the selected baud rate. Interrupts are disabled. |
47 | * Set the modem control signals if the option is selected. |
48 | * |
49 | * RETURNS: N/A |
50 | */ |
51 | |
52 | int serial_init (void) |
53 | { |
54 | #if !defined(CONFIG_NAND_U_BOOT) || defined(CONFIG_NAND_SPL) |
55 | volatile u8 *uart_fcr = (volatile u8 *)(UART_BASE + OFF_FCR); |
56 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
57 | volatile u8 *uart_ier = (volatile u8 *)(UART_BASE + OFF_IER); |
58 | volatile u8 *uart_sircr = (volatile u8 *)(UART_BASE + OFF_SIRCR); |
59 | |
60 | /* Disable port interrupts while changing hardware */ |
61 | *uart_ier = 0; |
62 | |
63 | /* Disable UART unit function */ |
64 | *uart_fcr = ~UART_FCR_UUE; |
65 | |
66 | /* Set both receiver and transmitter in UART mode (not SIR) */ |
67 | *uart_sircr = ~(SIRCR_RSIRE | SIRCR_TSIRE); |
68 | |
69 | /* Set databits, stopbits and parity. (8-bit data, 1 stopbit, no parity) */ |
70 | *uart_lcr = UART_LCR_WLEN_8 | UART_LCR_STOP_1; |
71 | |
72 | /* Set baud rate */ |
73 | serial_setbrg(); |
74 | |
75 | /* Enable UART unit, enable and clear FIFO */ |
76 | *uart_fcr = UART_FCR_UUE | UART_FCR_FE | UART_FCR_TFLS | UART_FCR_RFLS; |
77 | #endif |
78 | return 0; |
79 | } |
80 | |
81 | void serial_setbrg (void) |
82 | { |
83 | volatile u8 *uart_lcr = (volatile u8 *)(UART_BASE + OFF_LCR); |
84 | volatile u8 *uart_dlhr = (volatile u8 *)(UART_BASE + OFF_DLHR); |
85 | volatile u8 *uart_dllr = (volatile u8 *)(UART_BASE + OFF_DLLR); |
86 | u32 baud_div, tmp; |
87 | |
88 | baud_div = CONFIG_SYS_EXTAL / 16 / CONFIG_BAUDRATE; |
89 | |
90 | tmp = *uart_lcr; |
91 | tmp |= UART_LCR_DLAB; |
92 | *uart_lcr = tmp; |
93 | |
94 | *uart_dlhr = (baud_div >> 8) & 0xff; |
95 | *uart_dllr = baud_div & 0xff; |
96 | |
97 | tmp &= ~UART_LCR_DLAB; |
98 | *uart_lcr = tmp; |
99 | } |
100 | |
101 | void serial_putc (const char c) |
102 | { |
103 | volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); |
104 | volatile u8 *uart_tdr = (volatile u8 *)(UART_BASE + OFF_TDR); |
105 | |
106 | if (c == '\n') serial_putc ('\r'); |
107 | |
108 | /* Wait for fifo to shift out some bytes */ |
109 | while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) ); |
110 | |
111 | *uart_tdr = (u8)c; |
112 | } |
113 | |
114 | void serial_puts (const char *s) |
115 | { |
116 | while (*s) { |
117 | serial_putc (*s++); |
118 | } |
119 | } |
120 | |
121 | int serial_getc (void) |
122 | { |
123 | volatile u8 *uart_rdr = (volatile u8 *)(UART_BASE + OFF_RDR); |
124 | |
125 | while (!serial_tstc()); |
126 | |
127 | return *uart_rdr; |
128 | } |
129 | |
130 | int serial_tstc (void) |
131 | { |
132 | volatile u8 *uart_lsr = (volatile u8 *)(UART_BASE + OFF_LSR); |
133 | |
134 | if (*uart_lsr & UART_LSR_DR) { |
135 | /* Data in rfifo */ |
136 | return (1); |
137 | } |
138 | return 0; |
139 | } |
140 | |
141 | #endif |
142 |