3 * Sysgo Real-Time Solutions, GmbH <www.elinos.com>
4 * Marius Groeger <mgroeger@sysgo.de>
7 * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
9 * See file CREDITS for list of people who contributed to this
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License as
14 * published by the Free Software Foundation; either version 2 of
15 * the License, or (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
35 #include <asm/system.h>
38 DECLARE_GLOBAL_DATA_PTR;
41 static void cp_delay (void)
45 /* copro seems to need some delay between reading and writing */
46 for (i = 0; i < 100; i++);
52 * setup up stacks if necessary
55 IRQ_STACK_START = _armboot_start - CONFIG_SYS_MALLOC_LEN - CONFIG_SYS_GBL_DATA_SIZE - 4;
56 FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ;
61 int cleanup_before_linux (void)
64 * this function is called just before we call linux
65 * it prepares the processor for linux
67 * we turn off caches etc ...
72 disable_interrupts ();
74 /* ARM926E-S needs the protection unit enabled for the icache to have
75 * been enabled - left for possible later use
76 * should turn off the protection unit as well....
78 /* turn off I/D-cache */
79 asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i));
81 asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i));
85 asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i));
86 asm ("mcr p15, 0, %0, c7, c6, 0": :"r" (i));
90 int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
92 extern void reset_cpu (ulong addr);
94 disable_interrupts ();
99 /* ARM926E-S needs the protection unit enabled for this to have any effect
100 - left for possible later use */
101 void icache_enable (void)
105 reg = get_cr (); /* get control reg. */
110 void icache_disable (void)
116 set_cr (reg & ~CR_I);
119 int icache_status (void)
121 return (get_cr () & CR_I) != 0;