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Diffstat (limited to 'arch/arm/cpu/arm720t/cpu.c')
| -rw-r--r-- | arch/arm/cpu/arm720t/cpu.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/arch/arm/cpu/arm720t/cpu.c b/arch/arm/cpu/arm720t/cpu.c new file mode 100644 index 0000000..88c71bf --- /dev/null +++ b/arch/arm/cpu/arm720t/cpu.c @@ -0,0 +1,90 @@ +/* + * (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> +#include <clps7111.h> +#include <asm/hardware.h> +#include <asm/system.h> + +#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) +static void cache_flush(void); +#endif + +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 ... + * and we set the CPU-speed to 73 MHz - see start.S for details + */ + +#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) + disable_interrupts (); + + /* turn off I-cache */ + icache_disable(); + dcache_disable(); + + /* flush I-cache */ + cache_flush(); +#ifdef CONFIG_ARM7_REVD + /* go to high speed */ + IO_SYSCON3 = (IO_SYSCON3 & ~CLKCTL) | CLKCTL_73; +#endif +#elif defined(CONFIG_NETARM) || defined(CONFIG_S3C4510B) || defined(CONFIG_LPC2292) + disable_interrupts (); + /* Nothing more needed */ +#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR) + /* No cleanup before linux for IntegratorAP/CM720T as yet */ +#else +#error No cleanup_before_linux() defined for this CPU type +#endif + return 0; +} + +#if defined(CONFIG_IMPA7) || defined(CONFIG_EP7312) || defined(CONFIG_ARMADILLO) +/* flush I/D-cache */ +static void cache_flush (void) +{ + unsigned long i = 0; + + asm ("mcr p15, 0, %0, c7, c5, 0": :"r" (i)); +} +#elif defined(CONFIG_INTEGRATOR) && defined(CONFIG_ARCH_INTEGRATOR) + /* No specific cache setup for IntegratorAP/CM720T as yet */ + void icache_enable (void) + { + } +#endif |