/*
 * R8A7740 processor support
 *
 * Copyright (C) 2011  Renesas Solutions Corp.
 * Copyright (C) 2011  Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
 *
 * 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
 *
 * 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/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/sh_clk.h>
#include <linux/clkdev.h>
#include <mach/common.h>
#include <mach/r8a7740.h>

/*
 *        |  MDx  |  XTAL1/EXTAL1   |  System   | EXTALR |
 *  Clock |-------+-----------------+  clock    | 32.768 |   RCLK
 *  Mode  | 2/1/0 | src         MHz |  source   |  KHz   |  source
 * -------+-------+-----------------+-----------+--------+----------
 *    0   | 0 0 0 | External  20~50 | XTAL1     |    O   |  EXTALR
 *    1   | 0 0 1 | Crystal   20~30 | XTAL1     |    O   |  EXTALR
 *    2   | 0 1 0 | External  40~50 | XTAL1 / 2 |    O   |  EXTALR
 *    3   | 0 1 1 | Crystal   40~50 | XTAL1 / 2 |    O   |  EXTALR
 *    4   | 1 0 0 | External  20~50 | XTAL1     |    x   |  XTAL1 / 1024
 *    5   | 1 0 1 | Crystal   20~30 | XTAL1     |    x   |  XTAL1 / 1024
 *    6   | 1 1 0 | External  40~50 | XTAL1 / 2 |    x   |  XTAL1 / 2048
 *    7   | 1 1 1 | Crystal   40~50 | XTAL1 / 2 |    x   |  XTAL1 / 2048
 */

/* CPG registers */
#define FRQCRA		0xe6150000
#define FRQCRB		0xe6150004
#define FRQCRC		0xe61500e0
#define PLLC01CR	0xe6150028

#define SUBCKCR		0xe6150080

#define MSTPSR0		0xe6150030
#define MSTPSR1		0xe6150038
#define MSTPSR2		0xe6150040
#define MSTPSR3		0xe6150048
#define MSTPSR4		0xe615004c
#define SMSTPCR0	0xe6150130
#define SMSTPCR1	0xe6150134
#define SMSTPCR2	0xe6150138
#define SMSTPCR3	0xe615013c
#define SMSTPCR4	0xe6150140

/* Fixed 32 KHz root clock from EXTALR pin */
static struct clk extalr_clk = {
	.rate	= 32768,
};

/*
 * 25MHz default rate for the EXTAL1 root input clock.
 * If needed, reset this with clk_set_rate() from the platform code.
 */
static struct clk extal1_clk = {
	.rate	= 25000000,
};

/*
 * 48MHz default rate for the EXTAL2 root input clock.
 * If needed, reset this with clk_set_rate() from the platform code.
 */
static struct clk extal2_clk = {
	.rate	= 48000000,
};

/*
 * 27MHz default rate for the DV_CLKI root input clock.
 * If needed, reset this with clk_set_rate() from the platform code.
 */
static struct clk dv_clk = {
	.rate	= 27000000,
};

static unsigned long div_recalc(struct clk *clk)
{
	return clk->parent->rate / (int)(clk->priv);
}

static struct clk_ops div_clk_ops = {
	.recalc	= div_recalc,
};

/* extal1 / 2 */
static struct clk extal1_div2_clk = {
	.ops	= &div_clk_ops,
	.priv	= (void *)2,
	.parent	= &extal1_clk,
};

/* extal1 / 1024 */
static struct clk extal1_div1024_clk = {
	.ops	= &div_clk_ops,
	.priv	= (void *)1024,
	.parent	= &extal1_clk,
};

/* extal1 / 2 / 1024 */
static struct clk extal1_div2048_clk = {
	.ops	= &div_clk_ops,
	.priv	= (void *)1024,
	.parent	= &extal1_div2_clk,
};

/* extal2 / 2 */
static struct clk extal2_div2_clk = {
	.ops	= &div_clk_ops,
	.priv	= (void *)2,
	.parent	= &extal2_clk,
};

static struct clk_ops followparent_clk_ops = {
	.recalc	= followparent_recalc,
};

/* Main clock */
static struct clk system_clk = {
	.ops	= &followparent_clk_ops,
};

static struct clk system_div2_clk = {
	.ops	= &div_clk_ops,
	.priv	= (void *)2,
	.parent	= &system_clk,
};

/* r_clk */
static struct clk r_clk = {
	.ops	= &followparent_clk_ops,
};

/* PLLC0/PLLC1 */
static unsigned long pllc01_recalc(struct clk *clk)
{
	unsigned long mult = 1;

	if (__raw_readl(PLLC01CR) & (1 << 14))
		mult = ((__raw_readl(clk->enable_reg) >> 24) & 0x7f) + 1;

	return clk->parent->rate * mult;
}

static struct clk_ops pllc01_clk_ops = {
	.recalc		= pllc01_recalc,
};

static struct clk pllc0_clk = {
	.ops		= &pllc01_clk_ops,
	.flags		= CLK_ENABLE_ON_INIT,
	.parent		= &system_clk,
	.enable_reg	= (void __iomem *)FRQCRC,
};

static struct clk pllc1_clk = {
	.ops		= &pllc01_clk_ops,
	.flags		= CLK_ENABLE_ON_INIT,
	.parent		= &system_div2_clk,
	.enable_reg	= (void __iomem *)FRQCRA,
};

/* PLLC1 / 2 */
static struct clk pllc1_div2_clk = {
	.ops		= &div_clk_ops,
	.priv		= (void *)2,
	.parent		= &pllc1_clk,
};

struct clk *main_clks[] = {
	&extalr_clk,
	&extal1_clk,
	&extal2_clk,
	&extal1_div2_clk,
	&extal1_div1024_clk,
	&extal1_div2048_clk,
	&extal2_div2_clk,
	&dv_clk,
	&system_clk,
	&system_div2_clk,
	&r_clk,
	&pllc0_clk,
	&pllc1_clk,
	&pllc1_div2_clk,
};

static void div4_kick(struct clk *clk)
{
	unsigned long value;

	/* set KICK bit in FRQCRB to update hardware setting */
	value = __raw_readl(FRQCRB);
	value |= (1 << 31);
	__raw_writel(value, FRQCRB);
}

static int divisors[] = { 2, 3, 4, 6, 8, 12, 16, 18,
			  24, 32, 36, 48, 0, 72, 96, 0 };

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

static struct clk_div4_table div4_table = {
	.div_mult_table = &div4_div_mult_table,
	.kick = div4_kick,
};

enum {
	DIV4_I, DIV4_ZG, DIV4_B, DIV4_M1, DIV4_HP,
	DIV4_HPP, DIV4_S, DIV4_ZB, DIV4_M3, DIV4_CP,
	DIV4_NR
};

struct clk div4_clks[DIV4_NR] = {
	[DIV4_I]	= SH_CLK_DIV4(&pllc1_clk, FRQCRA, 20, 0x6fff, CLK_ENABLE_ON_INIT),
	[DIV4_ZG]	= SH_CLK_DIV4(&pllc1_clk, FRQCRA, 16, 0x6fff, CLK_ENABLE_ON_INIT),
	[DIV4_B]	= SH_CLK_DIV4(&pllc1_clk, FRQCRA,  8, 0x6fff, CLK_ENABLE_ON_INIT),
	[DIV4_M1]	= SH_CLK_DIV4(&pllc1_clk, FRQCRA,  4, 0x6fff, CLK_ENABLE_ON_INIT),
	[DIV4_HP]	= SH_CLK_DIV4(&pllc1_clk, FRQCRB,  4, 0x6fff, 0),
	[DIV4_HPP]	= SH_CLK_DIV4(&pllc1_clk, FRQCRC, 20, 0x6fff, 0),
	[DIV4_S]	= SH_CLK_DIV4(&pllc1_clk, FRQCRC, 12, 0x6fff, 0),
	[DIV4_ZB]	= SH_CLK_DIV4(&pllc1_clk, FRQCRC,  8, 0x6fff, 0),
	[DIV4_M3]	= SH_CLK_DIV4(&pllc1_clk, FRQCRC,  4, 0x6fff, 0),
	[DIV4_CP]	= SH_CLK_DIV4(&pllc1_clk, FRQCRC,  0, 0x6fff, 0),
};

enum {
	DIV6_SUB,
	DIV6_NR
};

static struct clk div6_clks[DIV6_NR] = {
	[DIV6_SUB]	= SH_CLK_DIV6(&pllc1_div2_clk, SUBCKCR, 0),
};

enum {
	MSTP125,
	MSTP116, MSTP111, MSTP100, MSTP117,

	MSTP230,
	MSTP222,
	MSTP207, MSTP206, MSTP204, MSTP203, MSTP202, MSTP201, MSTP200,

	MSTP329, MSTP323,

	MSTP_NR
};

static struct clk mstp_clks[MSTP_NR] = {
	[MSTP125] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR1, 25, 0), /* TMU0 */
	[MSTP117] = SH_CLK_MSTP32(&div4_clks[DIV4_B],	SMSTPCR1, 17, 0), /* LCDC1 */
	[MSTP116] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR1, 16, 0), /* IIC0 */
	[MSTP111] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR1, 11, 0), /* TMU1 */
	[MSTP100] = SH_CLK_MSTP32(&div4_clks[DIV4_B],	SMSTPCR1,  0, 0), /* LCDC0 */

	[MSTP230] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2, 30, 0), /* SCIFA6 */
	[MSTP222] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2, 22, 0), /* SCIFA7 */
	[MSTP207] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  7, 0), /* SCIFA5 */
	[MSTP206] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  6, 0), /* SCIFB */
	[MSTP204] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  4, 0), /* SCIFA0 */
	[MSTP203] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  3, 0), /* SCIFA1 */
	[MSTP202] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  2, 0), /* SCIFA2 */
	[MSTP201] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  1, 0), /* SCIFA3 */
	[MSTP200] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR2,  0, 0), /* SCIFA4 */

	[MSTP329] = SH_CLK_MSTP32(&r_clk,		SMSTPCR3, 29, 0), /* CMT10 */
	[MSTP323] = SH_CLK_MSTP32(&div6_clks[DIV6_SUB],	SMSTPCR3, 23, 0), /* IIC1 */
};

static struct clk_lookup lookups[] = {
	/* main clocks */
	CLKDEV_CON_ID("extalr",			&extalr_clk),
	CLKDEV_CON_ID("extal1",			&extal1_clk),
	CLKDEV_CON_ID("extal2",			&extal2_clk),
	CLKDEV_CON_ID("extal1_div2",		&extal1_div2_clk),
	CLKDEV_CON_ID("extal1_div1024",		&extal1_div1024_clk),
	CLKDEV_CON_ID("extal1_div2048",		&extal1_div2048_clk),
	CLKDEV_CON_ID("extal2_div2",		&extal2_div2_clk),
	CLKDEV_CON_ID("dv_clk",			&dv_clk),
	CLKDEV_CON_ID("system_clk",		&system_clk),
	CLKDEV_CON_ID("system_div2_clk",	&system_div2_clk),
	CLKDEV_CON_ID("r_clk",			&r_clk),
	CLKDEV_CON_ID("pllc0_clk",		&pllc0_clk),
	CLKDEV_CON_ID("pllc1_clk",		&pllc1_clk),
	CLKDEV_CON_ID("pllc1_div2_clk",		&pllc1_div2_clk),

	/* DIV4 clocks */
	CLKDEV_CON_ID("i_clk",			&div4_clks[DIV4_I]),
	CLKDEV_CON_ID("zg_clk",			&div4_clks[DIV4_ZG]),
	CLKDEV_CON_ID("b_clk",			&div4_clks[DIV4_B]),
	CLKDEV_CON_ID("m1_clk",			&div4_clks[DIV4_M1]),
	CLKDEV_CON_ID("hp_clk",			&div4_clks[DIV4_HP]),
	CLKDEV_CON_ID("hpp_clk",		&div4_clks[DIV4_HPP]),
	CLKDEV_CON_ID("s_clk",			&div4_clks[DIV4_S]),
	CLKDEV_CON_ID("zb_clk",			&div4_clks[DIV4_ZB]),
	CLKDEV_CON_ID("m3_clk",			&div4_clks[DIV4_M3]),
	CLKDEV_CON_ID("cp_clk",			&div4_clks[DIV4_CP]),

	/* DIV6 clocks */
	CLKDEV_CON_ID("sub_clk",		&div6_clks[DIV6_SUB]),

	/* MSTP32 clocks */
	CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0",	&mstp_clks[MSTP100]),
	CLKDEV_DEV_ID("sh_tmu.1",		&mstp_clks[MSTP111]),
	CLKDEV_DEV_ID("i2c-sh_mobile.0",	&mstp_clks[MSTP116]),
	CLKDEV_DEV_ID("sh_mobile_lcdc_fb.1",	&mstp_clks[MSTP117]),
	CLKDEV_DEV_ID("sh_tmu.0",		&mstp_clks[MSTP125]),

	CLKDEV_DEV_ID("sh-sci.4",		&mstp_clks[MSTP200]),
	CLKDEV_DEV_ID("sh-sci.3",		&mstp_clks[MSTP201]),
	CLKDEV_DEV_ID("sh-sci.2",		&mstp_clks[MSTP202]),
	CLKDEV_DEV_ID("sh-sci.1",		&mstp_clks[MSTP203]),
	CLKDEV_DEV_ID("sh-sci.0",		&mstp_clks[MSTP204]),
	CLKDEV_DEV_ID("sh-sci.8",		&mstp_clks[MSTP206]),
	CLKDEV_DEV_ID("sh-sci.5",		&mstp_clks[MSTP207]),

	CLKDEV_DEV_ID("sh-sci.7",		&mstp_clks[MSTP222]),
	CLKDEV_DEV_ID("sh-sci.6",		&mstp_clks[MSTP230]),

	CLKDEV_DEV_ID("sh_cmt.10",		&mstp_clks[MSTP329]),
	CLKDEV_DEV_ID("i2c-sh_mobile.1",	&mstp_clks[MSTP323]),
};

void __init r8a7740_clock_init(u8 md_ck)
{
	int k, ret = 0;

	/* detect system clock parent */
	if (md_ck & MD_CK1)
		system_clk.parent = &extal1_div2_clk;
	else
		system_clk.parent = &extal1_clk;

	/* detect RCLK parent */
	switch (md_ck & (MD_CK2 | MD_CK1)) {
	case MD_CK2 | MD_CK1:
		r_clk.parent = &extal1_div2048_clk;
		break;
	case MD_CK2:
		r_clk.parent = &extal1_div1024_clk;
		break;
	case MD_CK1:
	default:
		r_clk.parent = &extalr_clk;
		break;
	}

	for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
		ret = clk_register(main_clks[k]);

	if (!ret)
		ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);

	if (!ret)
		ret = sh_clk_div6_register(div6_clks, DIV6_NR);

	if (!ret)
		ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR);

	clkdev_add_table(lookups, ARRAY_SIZE(lookups));

	if (!ret)
		clk_init();
	else
		panic("failed to setup r8a7740 clocks\n");
}