// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/cpu/sh3/clock-sh7709.c
 *
 * SH7709 support for the clock framework
 *
 *  Copyright (C) 2005  Andriy Skulysh
 *
 * Based on arch/sh/kernel/cpu/sh3/clock-sh7705.c
 *  Copyright (C) 2005  Paul Mundt
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <asm/clock.h>
#include <asm/freq.h>
#include <asm/io.h>

static int stc_multipliers[] = { 1, 2, 4, 8, 3, 6, 1, 1 };
static int ifc_divisors[]    = { 1, 2, 4, 1, 3, 1, 1, 1 };
static int pfc_divisors[]    = { 1, 2, 4, 1, 3, 6, 1, 1 };

static void master_clk_init(struct clk *clk)
{
        int frqcr = __raw_readw(FRQCR);
        int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);

        clk->rate *= pfc_divisors[idx];
}

static struct sh_clk_ops sh7709_master_clk_ops = {
        .init           = master_clk_init,
};

static unsigned long module_clk_recalc(struct clk *clk)
{
        int frqcr = __raw_readw(FRQCR);
        int idx = ((frqcr & 0x2000) >> 11) | (frqcr & 0x0003);

        return clk->parent->rate / pfc_divisors[idx];
}

static struct sh_clk_ops sh7709_module_clk_ops = {
        .recalc         = module_clk_recalc,
};

static unsigned long bus_clk_recalc(struct clk *clk)
{
        int frqcr = __raw_readw(FRQCR);
        int idx = (frqcr & 0x0080) ?
                ((frqcr & 0x8000) >> 13) | ((frqcr & 0x0030) >> 4) : 1;

        return clk->parent->rate * stc_multipliers[idx];
}

static struct sh_clk_ops sh7709_bus_clk_ops = {
        .recalc         = bus_clk_recalc,
};

static unsigned long cpu_clk_recalc(struct clk *clk)
{
        int frqcr = __raw_readw(FRQCR);
        int idx = ((frqcr & 0x4000) >> 12) | ((frqcr & 0x000c) >> 2);

        return clk->parent->rate / ifc_divisors[idx];
}

static struct sh_clk_ops sh7709_cpu_clk_ops = {
        .recalc         = cpu_clk_recalc,
};

static struct sh_clk_ops *sh7709_clk_ops[] = {
        &sh7709_master_clk_ops,
        &sh7709_module_clk_ops,
        &sh7709_bus_clk_ops,
        &sh7709_cpu_clk_ops,
};

void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
{
        if (idx < ARRAY_SIZE(sh7709_clk_ops))
                *ops = sh7709_clk_ops[idx];
}