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wdenk5c952cf2004-10-10 21:27:30 +00001/*
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#include <net.h>
31#ifdef CONFIG_STATUS_LED
32#include <status_led.h>
33#endif
34
35
36/*
37 * All attempts to come up with a "common" initialization sequence
38 * that works for all boards and architectures failed: some of the
39 * requirements are just _too_ different. To get rid of the resulting
40 * mess of board dependend #ifdef'ed code we now make the whole
41 * initialization sequence configurable to the user.
42 *
43 * The requirements for any new initalization function is simple: it
44 * receives a pointer to the "global data" structure as it's only
45 * argument, and returns an integer return code, where 0 means
46 * "continue" and != 0 means "fatal error, hang the system".
47 */
48
49
50extern void malloc_bin_reloc (void);
51typedef int (init_fnc_t) (void);
52
53/*
54 * Begin and End of memory area for malloc(), and current "brk"
55 */
56static ulong mem_malloc_start = 0;
57static ulong mem_malloc_end = 0;
58static ulong mem_malloc_brk = 0;
59
60/*
61 * The Malloc area is immediately below the monitor copy in RAM
62 */
63static void mem_malloc_init (void)
64{
65 mem_malloc_start = CFG_MALLOC_BASE;
66 mem_malloc_end = mem_malloc_start + CFG_MALLOC_LEN;
67 mem_malloc_brk = mem_malloc_start;
68 memset ((void *) mem_malloc_start,
69 0,
70 mem_malloc_end - mem_malloc_start);
71}
72
73void *sbrk (ptrdiff_t increment)
74{
75 ulong old = mem_malloc_brk;
76 ulong new = old + increment;
77
78 if ((new < mem_malloc_start) || (new > mem_malloc_end)) {
79 return (NULL);
80 }
81 mem_malloc_brk = new;
82 return ((void *) old);
83}
84
85
86/************************************************************************
87 * Initialization sequence *
88 ***********************************************************************/
89
90init_fnc_t *init_sequence[] = {
91
92#if defined(CONFIG_BOARD_EARLY_INIT_F)
93 board_early_init_f, /* Call board-specific init code early.*/
94#endif
95
96 env_init,
97 serial_init,
98 console_init_f,
99 display_options,
100 checkcpu,
101 checkboard,
102 NULL, /* Terminate this list */
103};
104
105
106/***********************************************************************/
107void board_init (void)
108{
109 DECLARE_GLOBAL_DATA_PTR;
110
111 bd_t *bd;
112 init_fnc_t **init_fnc_ptr;
113 char *s, *e;
114 int i;
115
116 /* Pointer is writable since we allocated a register for it.
117 * Nios treats CFG_GBL_DATA_OFFSET as an address.
118 */
119 gd = (gd_t *)CFG_GBL_DATA_OFFSET;
120 /* compiler optimization barrier needed for GCC >= 3.4 */
121 __asm__ __volatile__("": : :"memory");
122
123 memset( gd, 0, CFG_GBL_DATA_SIZE );
124
125 gd->bd = (bd_t *)(gd+1); /* At end of global data */
126 gd->baudrate = CONFIG_BAUDRATE;
127 gd->cpu_clk = CONFIG_SYS_CLK_FREQ;
128
129 bd = gd->bd;
130 bd->bi_memstart = CFG_SDRAM_BASE;
131 bd->bi_memsize = CFG_SDRAM_SIZE;
132 bd->bi_flashstart = CFG_FLASH_BASE;
133#if defined(CFG_SRAM_BASE) && defined(CFG_SRAM_SIZE)
134 bd->bi_sramstart= CFG_SRAM_BASE;
135 bd->bi_sramsize = CFG_SRAM_SIZE;
136#endif
137 bd->bi_baudrate = CONFIG_BAUDRATE;
138
139 for (init_fnc_ptr = init_sequence; *init_fnc_ptr; ++init_fnc_ptr) {
140 WATCHDOG_RESET ();
141 if ((*init_fnc_ptr) () != 0) {
142 hang ();
143 }
144 }
145
146 WATCHDOG_RESET ();
147 bd->bi_flashsize = flash_init();
148
149 WATCHDOG_RESET ();
150 mem_malloc_init();
151 malloc_bin_reloc();
152 env_relocate();
153
154 bd->bi_ip_addr = getenv_IPaddr ("ipaddr");
155 s = getenv ("ethaddr");
156 for (i = 0; i < 6; ++i) {
157 bd->bi_enetaddr[i] = s ? simple_strtoul (s, &e, 16) : 0;
158 if (s) s = (*e) ? e + 1 : e;
159 }
160
161 WATCHDOG_RESET ();
162 devices_init();
163 jumptable_init();
164 console_init_r();
165
166 WATCHDOG_RESET ();
167 interrupt_init ();
168
169 /* main_loop */
170 for (;;) {
171 WATCHDOG_RESET ();
172 main_loop ();
173 }
174}
175
176
177/***********************************************************************/
178
179void hang (void)
180{
181 disable_interrupts ();
182 puts("### ERROR ### Please reset board ###\n");
183 for (;;);
184}