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4a551709 WD |
1 | /* |
2 | * (C) Copyright 2003, Psyent Corporation <www.psyent.com> | |
3 | * Scott McNutt <smcnutt@psyent.com> | |
4 | * | |
5 | * (C) Copyright 2000-2002 | |
6 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
7 | * | |
8 | * See file CREDITS for list of people who contributed to this | |
9 | * project. | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License as | |
13 | * published by the Free Software Foundation; either version 2 of | |
14 | * the License, or (at your option) any later version. | |
15 | * | |
16 | * This program is distributed in the hope that it will be useful, | |
17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | * GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with this program; if not, write to the Free Software | |
23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
24 | * MA 02111-1307 USA | |
25 | */ | |
26 | ||
27 | #include <common.h> | |
28 | #include <devices.h> | |
29 | #include <watchdog.h> | |
30 | ||
31 | ||
32 | /* | |
33 | * All attempts to come up with a "common" initialization sequence | |
34 | * that works for all boards and architectures failed: some of the | |
35 | * requirements are just _too_ different. To get rid of the resulting | |
36 | * mess of board dependend #ifdef'ed code we now make the whole | |
37 | * initialization sequence configurable to the user. | |
38 | * | |
39 | * The requirements for any new initalization function is simple: it | |
40 | * receives a pointer to the "global data" structure as it's only | |
41 | * argument, and returns an integer return code, where 0 means | |
42 | * "continue" and != 0 means "fatal error, hang the system". | |
43 | */ | |
44 | ||
45 | ||
46 | extern void malloc_bin_reloc (void); | |
47 | typedef int (init_fnc_t) (void); | |
48 | extern unsigned _vectors[]; | |
49 | ||
50 | /* | |
51 | * Begin and End of memory area for malloc(), and current "brk" | |
52 | */ | |
53 | static ulong mem_malloc_start = 0; | |
54 | static ulong mem_malloc_end = 0; | |
55 | static ulong mem_malloc_brk = 0; | |
56 | ||
57 | /* | |
58 | * The Malloc area is immediately below the monitor copy in RAM | |
59 | */ | |
60 | static void mem_malloc_init (void) | |
61 | { | |
62 | mem_malloc_start = CFG_MALLOC_BASE; | |
63 | mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN; | |
64 | mem_malloc_brk = mem_malloc_start; | |
65 | memset ((void *) mem_malloc_start, | |
66 | 0, | |
67 | mem_malloc_end - mem_malloc_start); | |
68 | } | |
69 | ||
70 | void *sbrk (ptrdiff_t increment) | |
71 | { | |
72 | ulong old = mem_malloc_brk; | |
73 | ulong new = old + increment; | |
74 | ||
75 | if ((new < mem_malloc_start) || (new > mem_malloc_end)) { | |
76 | return (NULL); | |
77 | } | |
78 | mem_malloc_brk = new; | |
79 | return ((void *) old); | |
80 | } | |
81 | ||
82 | ||
83 | /************************************************************************ | |
84 | * Initialization sequence * | |
85 | ***********************************************************************/ | |
86 | ||
87 | init_fnc_t *init_sequence[] = { | |
88 | ||
89 | #if defined(CONFIG_BOARD_PRE_INIT) | |
90 | board_pre_init, /* Call board-specific init code early.*/ | |
91 | #endif | |
92 | ||
93 | env_init, | |
94 | serial_init, | |
95 | console_init_f, | |
96 | display_options, | |
97 | checkcpu, | |
98 | checkboard, | |
99 | NULL, /* Terminate this list */ | |
100 | }; | |
101 | ||
102 | ||
103 | /***********************************************************************/ | |
104 | void board_init (void) | |
105 | { | |
106 | DECLARE_GLOBAL_DATA_PTR; | |
107 | ||
108 | bd_t *bd; | |
109 | init_fnc_t **init_fnc_ptr; | |
110 | ||
111 | /* Pointer is writable since we allocated a register for it. | |
112 | * Nios treats CFG_GBL_DATA_OFFSET as an address. | |
113 | */ | |
114 | gd = (gd_t *)CFG_GBL_DATA_OFFSET; | |
115 | memset( gd, 0, CFG_GBL_DATA_SIZE ); | |
116 | ||
117 | /* Copy exception vectors to the correct location. | |
118 | */ | |
119 | memcpy( (void *)CFG_VECT_BASE, _vectors, 256 ); | |
120 | ||
121 | gd->bd = (bd_t *)(gd+1); /* At end of global data */ | |
122 | gd->baudrate = CONFIG_BAUDRATE; | |
123 | gd->cpu_clk = CONFIG_SYS_CLK_FREQ; | |
124 | ||
125 | bd = gd->bd; | |
126 | bd->bi_memstart = CFG_SDRAM_BASE; | |
127 | bd->bi_memsize = CFG_SDRAM_SIZE; | |
128 | bd->bi_flashstart = CFG_FLASH_BASE; | |
129 | bd->bi_sramstart= CFG_SRAM_BASE; | |
130 | bd->bi_sramsize = CFG_SRAM_SIZE; | |
131 | bd->bi_baudrate = CONFIG_BAUDRATE; | |
132 | ||
133 | for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) { | |
134 | if ((*init_fnc_ptr) () != 0) { | |
135 | hang (); | |
136 | } | |
137 | } | |
138 | ||
139 | bd->bi_flashsize = flash_init(); | |
140 | ||
141 | mem_malloc_init(); | |
142 | malloc_bin_reloc(); | |
143 | env_relocate(); | |
144 | ||
145 | devices_init(); | |
146 | jumptable_init(); | |
147 | console_init_r(); | |
148 | /* | |
149 | */ | |
150 | ||
151 | interrupt_init (); | |
152 | /* main_loop */ | |
153 | for (;;) { | |
154 | WATCHDOG_RESET (); | |
155 | main_loop (); | |
156 | } | |
157 | } | |
158 | ||
159 | ||
160 | /***********************************************************************/ | |
161 | ||
162 | void hang (void) | |
163 | { | |
164 | puts("### ERROR ### Please reset board ###\n"); | |
165 | for (;;); | |
166 | } |