// SPDX-License-Identifier: GPL-2.0
/*
 * arch/sh/kernel/cpu/sh4/clock-shx3.c
 *
 * SH-X3 support for the clock framework
 *
 *  Copyright (C) 2006-2007  Renesas Technology Corp.
 *  Copyright (C) 2006-2007  Renesas Solutions Corp.
 *  Copyright (C) 2006-2010  Paul Mundt
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/clkdev.h>
#include <asm/clock.h>
#include <asm/freq.h>

/*
 * Default rate for the root input clock, reset this with clk_set_rate()
 * from the platform code.
 */
static struct clk extal_clk = {
        .rate           = 16666666,
};

static unsigned long pll_recalc(struct clk *clk)
{
        /* PLL1 has a fixed x72 multiplier.  */
        return clk->parent->rate * 72;
}

static struct sh_clk_ops pll_clk_ops = {
        .recalc         = pll_recalc,
};

static struct clk pll_clk = {
        .ops            = &pll_clk_ops,
        .parent         = &extal_clk,
        .flags          = CLK_ENABLE_ON_INIT,
};

static struct clk *clks[] = {
        &extal_clk,
        &pll_clk,
};

static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
                               24, 32, 36, 48 };

static struct clk_div_mult_table div4_div_mult_table = {
        .divisors = div2,
        .nr_divisors = ARRAY_SIZE(div2),
};

static struct clk_div4_table div4_table = {
        .div_mult_table = &div4_div_mult_table,
};

enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_SHA, DIV4_P, DIV4_NR };

#define DIV4(_bit, _mask, _flags) \
  SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)

struct clk div4_clks[DIV4_NR] = {
        [DIV4_P] = DIV4(0, 0x0f80, 0),
        [DIV4_SHA] = DIV4(4, 0x0ff0, 0),
        [DIV4_DDR] = DIV4(12, 0x000c, CLK_ENABLE_ON_INIT),
        [DIV4_B] = DIV4(16, 0x0fe0, CLK_ENABLE_ON_INIT),
        [DIV4_SH] = DIV4(20, 0x000c, CLK_ENABLE_ON_INIT),
        [DIV4_I] = DIV4(28, 0x000e, CLK_ENABLE_ON_INIT),
};

#define MSTPCR0         0xffc00030
#define MSTPCR1         0xffc00034

enum { MSTP027, MSTP026, MSTP025, MSTP024,
       MSTP009, MSTP008, MSTP003, MSTP002,
       MSTP001, MSTP000, MSTP119, MSTP105,
       MSTP104, MSTP_NR };

static struct clk mstp_clks[MSTP_NR] = {
        /* MSTPCR0 */
        [MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
        [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
        [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
        [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
        [MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
        [MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
        [MSTP003] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 3, 0),
        [MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
        [MSTP001] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 1, 0),
        [MSTP000] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 0, 0),

        /* MSTPCR1 */
        [MSTP119] = SH_CLK_MSTP32(NULL, MSTPCR1, 19, 0),
        [MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
        [MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
};

static struct clk_lookup lookups[] = {
        /* main clocks */
        CLKDEV_CON_ID("extal", &extal_clk),
        CLKDEV_CON_ID("pll_clk", &pll_clk),

        /* DIV4 clocks */
        CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
        CLKDEV_CON_ID("shywaya_clk", &div4_clks[DIV4_SHA]),
        CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
        CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
        CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
        CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),

        /* MSTP32 clocks */
        CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP027]),
        CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP026]),
        CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP025]),
        CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP024]),

        CLKDEV_CON_ID("h8ex_fck", &mstp_clks[MSTP003]),
        CLKDEV_CON_ID("csm_fck", &mstp_clks[MSTP002]),
        CLKDEV_CON_ID("fe1_fck", &mstp_clks[MSTP001]),
        CLKDEV_CON_ID("fe0_fck", &mstp_clks[MSTP000]),

        CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP008]),
        CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP009]),

        CLKDEV_CON_ID("hudi_fck", &mstp_clks[MSTP119]),
        CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
        CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
};

int __init arch_clk_init(void)
{
        int i, ret = 0;

        for (i = 0; i < ARRAY_SIZE(clks); i++)
                ret |= clk_register(clks[i]);

        clkdev_add_table(lookups, ARRAY_SIZE(lookups));

        if (!ret)
                ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
                                           &div4_table);
        if (!ret)
                ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);

        return ret;
}