blob: 7f9f3344b3f17d1f7e7e1a76140ff4a26eb677b2 [file] [log] [blame]
wdenk2d5b5612003-10-14 19:43:55 +00001/*
2 * (C) Copyright 2002
3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
5 *
6 * (C) Copyright 2002
7 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
8 * Alex Zuepke <azu@sysgo.de>
9 *
10 * See file CREDITS for list of people who contributed to this
11 * project.
12 *
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License as
15 * published by the Free Software Foundation; either version 2 of
16 * the License, or (at your option) any later version.
17 *
18 * This program is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 * GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with this program; if not, write to the Free Software
25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
26 * MA 02111-1307 USA
27 */
28
29/*
30 * CPU specific code
31 */
32
33#include <common.h>
34#include <command.h>
35#include <asm/arch/ixp425.h>
36
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020037ulong loops_per_jiffy;
38
Wolfgang Denkd87080b2006-03-31 18:32:53 +020039#ifdef CONFIG_USE_IRQ
40DECLARE_GLOBAL_DATA_PTR;
41#endif
42
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020043#if defined(CONFIG_DISPLAY_CPUINFO)
44int print_cpuinfo (void)
45{
46 unsigned long id;
47 int speed = 0;
48
49 asm ("mrc p15, 0, %0, c0, c0, 0":"=r" (id));
50
51 puts("CPU: Intel IXP425 at ");
52 switch ((id & 0x000003f0) >> 4) {
53 case 0x1c:
54 loops_per_jiffy = 887467;
55 speed = 533;
56 break;
57
58 case 0x1d:
59 loops_per_jiffy = 666016;
60 speed = 400;
61 break;
62
63 case 0x1f:
64 loops_per_jiffy = 442901;
65 speed = 266;
66 break;
67 }
68
69 if (speed)
70 printf("%d MHz\n", speed);
71 else
72 puts("unknown revision\n");
73
74 return 0;
75}
76#endif /* CONFIG_DISPLAY_CPUINFO */
77
wdenk2d5b5612003-10-14 19:43:55 +000078int cpu_init (void)
79{
80 /*
wdenkf6e20fc2004-02-08 19:38:38 +000081 * setup up stacks if necessary
wdenk2d5b5612003-10-14 19:43:55 +000082 */
wdenk2d5b5612003-10-14 19:43:55 +000083#ifdef CONFIG_USE_IRQ
wdenkf6e20fc2004-02-08 19:38:38 +000084 IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4;
85 FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
wdenk2d5b5612003-10-14 19:43:55 +000086#endif
wdenkf6e20fc2004-02-08 19:38:38 +000087
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020088#if (CONFIG_COMMANDS & CFG_CMD_PCI) || defined (CONFIG_PCI)
wdenkf6e20fc2004-02-08 19:38:38 +000089 pci_init();
Wolfgang Denkba94a1b2006-05-30 15:56:48 +020090#endif
wdenk2d5b5612003-10-14 19:43:55 +000091 return 0;
92}
93
94int cleanup_before_linux (void)
95{
96 /*
97 * this function is called just before we call linux
98 * it prepares the processor for linux
99 *
100 * just disable everything that can disturb booting linux
101 */
102
103 unsigned long i;
104
105 disable_interrupts ();
106
107 /* turn off I-cache */
108 asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
109 i &= ~0x1000;
110 asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
111
112 /* flush I-cache */
113 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
114
115 return (0);
116}
117
118int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
119{
wdenkf6e20fc2004-02-08 19:38:38 +0000120 printf ("resetting ...\n");
wdenk2d5b5612003-10-14 19:43:55 +0000121
122 udelay (50000); /* wait 50 ms */
123 disable_interrupts ();
124 reset_cpu (0);
125
126 /*NOTREACHED*/
127 return (0);
128}
129
130/* taken from blob */
131void icache_enable (void)
132{
133 register u32 i;
134
135 /* read control register */
136 asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
137
138 /* set i-cache */
139 i |= 0x1000;
140
141 /* write back to control register */
142 asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
143}
144
145void icache_disable (void)
146{
147 register u32 i;
148
149 /* read control register */
150 asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
151
152 /* clear i-cache */
153 i &= ~0x1000;
154
155 /* write back to control register */
156 asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
157
158 /* flush i-cache */
159 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
160}
161
162int icache_status (void)
163{
164 register u32 i;
165
166 /* read control register */
167 asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
168
169 /* return bit */
170 return (i & 0x1000);
171}
172
173/* we will never enable dcache, because we have to setup MMU first */
174void dcache_enable (void)
175{
176 return;
177}
178
179void dcache_disable (void)
180{
181 return;
182}
183
184int dcache_status (void)
185{
186 return 0; /* always off */
187}
188
189/* FIXME */
wdenka1191902005-01-09 17:12:27 +0000190/*
wdenk2d5b5612003-10-14 19:43:55 +0000191void pci_init(void)
192{
193 return;
194}
wdenka1191902005-01-09 17:12:27 +0000195*/
Wolfgang Denkba94a1b2006-05-30 15:56:48 +0200196
197#ifdef CONFIG_BOOTCOUNT_LIMIT
198
199void bootcount_store (ulong a)
200{
201 volatile ulong *save_addr = (volatile ulong *)(CFG_BOOTCOUNT_ADDR);
202
203 save_addr[0] = a;
204 save_addr[1] = BOOTCOUNT_MAGIC;
205}
206
207ulong bootcount_load (void)
208{
209 volatile ulong *save_addr = (volatile ulong *)(CFG_BOOTCOUNT_ADDR);
210
211 if (save_addr[1] != BOOTCOUNT_MAGIC)
212 return 0;
213 else
214 return save_addr[0];
215}
216
217#endif /* CONFIG_BOOTCOUNT_LIMIT */