/* * (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 <asm/arch/ixp425.h> ulong loops_per_jiffy; #ifdef CONFIG_USE_IRQ DECLARE_GLOBAL_DATA_PTR; #endif #if defined(CONFIG_DISPLAY_CPUINFO) int print_cpuinfo (void) { unsigned long id; int speed = 0; asm ("mrc p15, 0, %0, c0, c0, 0":"=r" (id)); puts("CPU: Intel IXP425 at "); switch ((id & 0x000003f0) >> 4) { case 0x1c: loops_per_jiffy = 887467; speed = 533; break; case 0x1d: loops_per_jiffy = 666016; speed = 400; break; case 0x1f: loops_per_jiffy = 442901; speed = 266; break; } if (speed) printf("%d MHz\n", speed); else puts("unknown revision\n"); return 0; } #endif /* CONFIG_DISPLAY_CPUINFO */ 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 #if (CONFIG_COMMANDS & CFG_CMD_PCI) || defined (CONFIG_PCI) pci_init(); #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 */ } /* FIXME */ /* void pci_init(void) { return; } */ #ifdef CONFIG_BOOTCOUNT_LIMIT void bootcount_store (ulong a) { volatile ulong *save_addr = (volatile ulong *)(CFG_BOOTCOUNT_ADDR); save_addr[0] = a; save_addr[1] = BOOTCOUNT_MAGIC; } ulong bootcount_load (void) { volatile ulong *save_addr = (volatile ulong *)(CFG_BOOTCOUNT_ADDR); if (save_addr[1] != BOOTCOUNT_MAGIC) return 0; else return save_addr[0]; } #endif /* CONFIG_BOOTCOUNT_LIMIT */