Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 | /* * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Marius Groeger <mgroeger@sysgo.de> * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Alex Zuepke <azu@sysgo.de> * * 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 */ /* * CPU specific code */ #include <common.h> #include <command.h> #ifdef CONFIG_USE_IRQ DECLARE_GLOBAL_DATA_PTR; #endif int cpu_init (void) { /* * setup up stacks if necessary */ #ifdef CONFIG_USE_IRQ IRQ_STACK_START = _armboot_start - CFG_MALLOC_LEN - CFG_GBL_DATA_SIZE - 4; FIQ_STACK_START = IRQ_STACK_START - CONFIG_STACKSIZE_IRQ; #endif return 0; } int cleanup_before_linux (void) { /* * this function is called just before we call linux * it prepares the processor for linux * * just disable everything that can disturb booting linux */ unsigned long i; disable_interrupts (); /* turn off I-cache */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); i &= ~0x1000; asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); /* flush I-cache */ asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); return (0); } int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) { printf ("resetting ...\n"); udelay (50000); /* wait 50 ms */ disable_interrupts (); reset_cpu (0); /*NOTREACHED*/ return (0); } /* taken from blob */ void icache_enable (void) { register u32 i; /* read control register */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); /* set i-cache */ i |= 0x1000; /* write back to control register */ asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); } void icache_disable (void) { register u32 i; /* read control register */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); /* clear i-cache */ i &= ~0x1000; /* write back to control register */ asm ("mcr p15, 0, %0, c1, c0, 0": :"r" (i)); /* flush i-cache */ asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); } int icache_status (void) { register u32 i; /* read control register */ asm ("mrc p15, 0, %0, c1, c0, 0":"=r" (i)); /* return bit */ return (i & 0x1000); } /* we will never enable dcache, because we have to setup MMU first */ void dcache_enable (void) { return; } void dcache_disable (void) { return; } int dcache_status (void) { return 0; /* always off */ } |