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Diffstat (limited to 'cpu/mc9328/cpu.c')
| -rw-r--r-- | cpu/mc9328/cpu.c | 183 |
1 files changed, 0 insertions, 183 deletions
diff --git a/cpu/mc9328/cpu.c b/cpu/mc9328/cpu.c deleted file mode 100644 index 2a2b578..0000000 --- a/cpu/mc9328/cpu.c +++ /dev/null @@ -1,183 +0,0 @@ -/* - * (C) Copyright 2002 - * Sysgo Real-Time Solutions, GmbH <www.elinos.com> - * Marius Groeger <mgroeger@sysgo.de> - * - * (C) Copyright 2002 - * Gary Jennejohn, DENX Software Engineering, <gj@denx.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> -#include <arm920t.h> - -/* read co-processor 15, register #1 (control register) */ -static unsigned long read_p15_c1 (void) -{ - unsigned long value; - - __asm__ __volatile__( - "mrc p15, 0, %0, c1, c0, 0 @ read control reg\n" - : "=r" (value) - : - : "memory"); - -#ifdef MMU_DEBUG - printf ("p15/c1 is = %08lx\n", value); -#endif - return value; -} - -/* write to co-processor 15, register #1 (control register) */ -static void write_p15_c1 (unsigned long value) -{ -#ifdef MMU_DEBUG - printf ("write %08lx to p15/c1\n", value); -#endif - __asm__ __volatile__( - "mcr p15, 0, %0, c1, c0, 0 @ write it back\n" - : - : "r" (value) - : "memory"); - - read_p15_c1 (); -} - -static void cp_delay (void) -{ - volatile int i; - - /* copro seems to need some delay between reading and writing */ - for (i = 0; i < 100; i++); -} - -/* 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_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) -{ - /* - * setup up stacks if necessary - */ -#ifdef CONFIG_USE_IRQ - DECLARE_GLOBAL_DATA_PTR; - - 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 - * - * we turn off caches etc ... - */ - - unsigned long i; - - disable_interrupts (); - - /* 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)); - return (0); -} - -int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[]) -{ - extern void reset_cpu (ulong addr); - - disable_interrupts (); - reset_cpu (0); - /*NOTREACHED*/ - return (0); -} - -void icache_enable (void) -{ - ulong reg; - - reg = read_p15_c1 (); - cp_delay (); - write_p15_c1 (reg | C1_IC); -} - -void icache_disable (void) -{ - ulong reg; - - reg = read_p15_c1 (); - cp_delay (); - write_p15_c1 (reg & ~C1_IC); -} - -int icache_status (void) -{ - return (read_p15_c1 () & C1_IC) != 0; -} - -#ifdef USE_920T_MMU -/* It makes no sense to use the dcache if the MMU is not enabled */ -void dcache_enable (void) -{ - ulong reg; - - reg = read_p15_c1 (); - cp_delay (); - write_p15_c1 (reg | C1_DC); -} - -void dcache_disable (void) -{ - ulong reg; - - reg = read_p15_c1 (); - cp_delay (); - reg &= ~C1_DC; - write_p15_c1 (reg); -} - -int dcache_status (void) -{ - return (read_p15_c1 () & C1_DC) != 0; -} -#endif |