Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * Copyright (C) 2000,2001,2004 Broadcom Corporation

 *

 * 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.

 */

#include <linux/clocksource.h>

#include <asm/addrspace.h>

#include <asm/io.h>

#include <asm/time.h>

#include <asm/sibyte/bcm1480_regs.h>

#include <asm/sibyte/sb1250_regs.h>

#include <asm/sibyte/bcm1480_int.h>

#include <asm/sibyte/bcm1480_scd.h>

#include <asm/sibyte/sb1250.h>

static cycle_t bcm1480_hpt_read(void)

{

        return (cycle_t) __raw_readq(IOADDR(A_SCD_ZBBUS_CYCLE_COUNT));

}

struct clocksource bcm1480_clocksource = {

        .name   = "zbbus-cycles",

        .rating = 200,

        .read   = bcm1480_hpt_read,

        .mask   = CLOCKSOURCE_MASK(64),

        .flags  = CLOCK_SOURCE_IS_CONTINUOUS,

};

void __init sb1480_clocksource_init(void)

{

        struct clocksource *cs = &bcm1480_clocksource;

        unsigned int plldiv;

        unsigned long zbbus;

        plldiv = G_BCM1480_SYS_PLL_DIV(__raw_readq(IOADDR(A_SCD_SYSTEM_CFG)));

        zbbus = ((plldiv >> 1) * 50000000) + ((plldiv & 1) * 25000000);

        clocksource_set_clock(cs, zbbus);

        clocksource_register(cs);

}