From 819e36b8ceadb1d67db1ffe91b99c5282bfc6159 Mon Sep 17 00:00:00 2001 From: "H. Nikolaus Schaller" Date: Fri, 20 Apr 2012 14:10:36 +0200 Subject: tree moved to a better location --- cpu/arm1136/cpu.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 cpu/arm1136/cpu.c (limited to 'cpu/arm1136/cpu.c') diff --git a/cpu/arm1136/cpu.c b/cpu/arm1136/cpu.c new file mode 100644 index 0000000..1168fb9 --- /dev/null +++ b/cpu/arm1136/cpu.c @@ -0,0 +1,65 @@ +/* + * (C) Copyright 2004 Texas Insturments + * + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +/* + * udelay() is CPU specific code + */ + +#include + +/* See also ARM Ref. Man. */ +#define C1_MMU (1<<0) /* mmu off/on */ +#define C1_ALIGN (1<<1) /* alignment faults off/on */ +#define C1_DC (1<<2) /* dcache off/on */ +#define C1_WB (1<<3) /* merging write buffer on/off */ +#define C1_BIG_ENDIAN (1<<7) /* big endian off/on */ +#define C1_SYS_PROT (1<<8) /* system protection */ +#define C1_ROM_PROT (1<<9) /* ROM protection */ +#define C1_IC (1<<12) /* icache off/on */ +#define C1_HIGH_VECTORS (1<<13) /* location of vectors: low/high addresses */ +#define RESERVED_1 (0xf << 3) /* must be 111b for R/W */ + +int cpu_init (void) +{ + int i; + + /* turn off I/D-cache */ + asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); + i &= ~(C1_DC | C1_IC); + asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); + + /* flush I/D-cache */ + i = 0; + asm ("mcr p15, 0, %0, c7, c7, 0": :"r" (i)); // invalidate both caches and flush btb + asm ("mcr p15, 0, %0, c7, c10, 4": :"r" (i)); // mem barrier to sync things + + return 0; +} + + + + + + + + -- cgit v1.1