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/*
 *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License version 2 as published
 *  by the Free Software Foundation.
 *
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <asm/addrspace.h>

#include <asm/mach-adm5120/adm5120_info.h>
#include <asm/mach-adm5120/adm5120_defs.h>
#include <asm/mach-adm5120/adm5120_switch.h>

unsigned int adm5120_product_code;
unsigned int adm5120_revision;
unsigned int adm5120_package;
unsigned int adm5120_nand_boot;
unsigned long adm5120_speed;

/*
 * CPU settings detection
 */
#define CODE_GET_PC(c)          ((c) & CODE_PC_MASK)
#define CODE_GET_REV(c)         (((c) >> CODE_REV_SHIFT) & CODE_REV_MASK)
#define CODE_GET_PK(c)          (((c) >> CODE_PK_SHIFT) & CODE_PK_MASK)
#define CODE_GET_CLKS(c)        (((c) >> CODE_CLKS_SHIFT) & CODE_CLKS_MASK)
#define CODE_GET_NAB(c)         (((c) & CODE_NAB) != 0)

void adm5120_ndelay(u32 ns)
{
        u32     t;

        SW_WRITE_REG(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT);
        SW_WRITE_REG(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM));

        t = (ns+640) / 640;
        t &= TIMER_PERIOD_MASK;
        SW_WRITE_REG(SWITCH_REG_TIMER, t | TIMER_TE);

        /* wait until the timer expires */
        do {
                t = SW_READ_REG(SWITCH_REG_TIMER_INT);
        } while ((t & TIMER_INT_TOS) == 0);

        /* leave the timer disabled */
        SW_WRITE_REG(SWITCH_REG_TIMER, TIMER_PERIOD_DEFAULT);
        SW_WRITE_REG(SWITCH_REG_TIMER_INT, (TIMER_INT_TOS | TIMER_INT_TOM));
}

void __init adm5120_soc_init(void)
{
        u32 code;
        u32 clks;

        code = SW_READ_REG(SWITCH_REG_CODE);

        adm5120_product_code = CODE_GET_PC(code);
        adm5120_revision = CODE_GET_REV(code);
        adm5120_package = (CODE_GET_PK(code) == CODE_PK_BGA) ?
                ADM5120_PACKAGE_BGA : ADM5120_PACKAGE_PQFP;
        adm5120_nand_boot = CODE_GET_NAB(code);

        clks = CODE_GET_CLKS(code);
        adm5120_speed = ADM5120_SPEED_175;
        if (clks & 1)
                adm5120_speed += 25000000;
        if (clks & 2)
                adm5120_speed += 50000000;
}