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  • /*
     * Copyright (C) 2004-2006 Freescale Semiconductor, Inc.
     * (C) Copyright 2007 DENX Software Engineering
     *
     * 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 for the MPC512x family.
     *
     * Derived from the MPC83xx code.
     */
    
    #include <common.h>
    #include <command.h>
    #include <mpc512x.h>
    #include <asm/processor.h>
    
    
    #if defined(CONFIG_OF_LIBFDT)
    #include <fdt_support.h>
    #endif
    
    
    DECLARE_GLOBAL_DATA_PTR;
    
    int checkcpu (void)
    {
    	volatile immap_t *immr = (immap_t *) CFG_IMMR;
    	ulong clock = gd->cpu_clk;
    	u32 pvr = get_pvr ();
    	u32 spridr = immr->sysconf.spridr;
    	char buf[32];
    
    
    	puts ("CPU:   ");
    
    
    	switch (spridr & 0xffff0000) {
    	case SPR_5121E:
    		puts ("MPC5121e ");
    		break;
    	default:
    		printf ("Unknown part ID %08x ", spridr & 0xffff0000);
    	}
    	printf ("rev. %d.%d, Core ", SVR_MJREV (spridr), SVR_MNREV (spridr));
    
    	switch (pvr & 0xffff0000) {
    	case PVR_E300C4:
    		puts ("e300c4 ");
    		break;
    	default:
    		puts ("unknown ");
    	}
    	printf ("at %s MHz, CSB at %3d MHz\n", strmhz(buf, clock),
    		gd->csb_clk / 1000000);
    	return 0;
    }
    
    
    int
    do_reset (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
    {
    	ulong msr;
    	volatile immap_t *immap = (immap_t *) CFG_IMMR;
    
    	/* Interrupts and MMU off */
    	__asm__ __volatile__ ("mfmsr    %0":"=r" (msr):);
    
    	msr &= ~( MSR_EE | MSR_IR | MSR_DR);
    	__asm__ __volatile__ ("mtmsr    %0"::"r" (msr));
    
    	/*
    	 * Enable Reset Control Reg - "RSTE" is the magic word that let us go
    	 */
    	immap->reset.rpr = 0x52535445;
    
    	/* Verify Reset Control Reg is enabled */
    	while (!((immap->reset.rcer) & RCER_CRE))
    		;
    
    	printf ("Resetting the board.\n");
    	udelay(200);
    
    	/* Perform reset */
    	immap->reset.rcr = RCR_SWHR;
    
    	/* Unreached... */
    	return 1;
    }
    
    
    /*
     * Get timebase clock frequency (like cpu_clk in Hz)
     */
    unsigned long get_tbclk (void)
    {
    	ulong tbclk;
    
    	tbclk = (gd->bus_clk + 3L) / 4L;
    
    	return tbclk;
    }
    
    
    #if defined(CONFIG_WATCHDOG)
    void watchdog_reset (void)
    {
    	int re_enable = disable_interrupts ();
    
    	/* Reset watchdog */
    	volatile immap_t *immr = (immap_t *) CFG_IMMR;
    	immr->wdt.swsrr = 0x556c;
    	immr->wdt.swsrr = 0xaa39;
    
    	if (re_enable)
    		enable_interrupts ();
    }
    #endif
    
    
    #ifdef CONFIG_OF_LIBFDT
    void ft_cpu_setup(void *blob, bd_t *bd)
    {
    	char * cpu_path = "/cpus/" OF_CPU;
    	char * eth_path = "/" OF_SOC "/ethernet@2800";
    
    	do_fixup_by_path_u32(blob, cpu_path, "timebase-frequency", OF_TBCLK, 1);
    	do_fixup_by_path_u32(blob, cpu_path, "bus-frequency", bd->bi_busfreq, 1);
    	do_fixup_by_path_u32(blob, cpu_path, "clock-frequency", bd->bi_intfreq, 1);
    	do_fixup_by_path_u32(blob, "/" OF_SOC, "bus-frequency", bd->bi_ipsfreq, 1);
    	do_fixup_by_path(blob, eth_path, "local-mac-address", bd->bi_enetaddr, 6, 0);
    
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    	/* this is so old kernels with old device trees will boot */
    	do_fixup_by_path_u32(blob, "/" OF_SOC_OLD, "bus-frequency", bd->bi_ipsfreq, 0);