/*
 * sh73a0 clock framework support
 *
 * Copyright (C) 2010 Magnus Damm
 *
 * 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>

#define FRQCRA		IOMEM(0xe6150000)
#define FRQCRB		IOMEM(0xe6150004)
#define FRQCRD		IOMEM(0xe61500e4)
#define VCLKCR1		IOMEM(0xe6150008)
#define VCLKCR2		IOMEM(0xe615000C)
#define VCLKCR3		IOMEM(0xe615001C)
#define ZBCKCR		IOMEM(0xe6150010)
#define FLCKCR		IOMEM(0xe6150014)
#define SD0CKCR		IOMEM(0xe6150074)
#define SD1CKCR		IOMEM(0xe6150078)
#define SD2CKCR		IOMEM(0xe615007C)
#define FSIACKCR	IOMEM(0xe6150018)
#define FSIBCKCR	IOMEM(0xe6150090)
#define SUBCKCR		IOMEM(0xe6150080)
#define SPUACKCR	IOMEM(0xe6150084)
#define SPUVCKCR	IOMEM(0xe6150094)
#define MSUCKCR		IOMEM(0xe6150088)
#define HSICKCR		IOMEM(0xe615008C)
#define MFCK1CR		IOMEM(0xe6150098)
#define MFCK2CR		IOMEM(0xe615009C)
#define DSITCKCR	IOMEM(0xe6150060)
#define DSI0PCKCR	IOMEM(0xe6150064)
#define DSI1PCKCR	IOMEM(0xe6150068)
#define DSI0PHYCR	0xe615006C
#define DSI1PHYCR	0xe6150070
#define PLLECR		IOMEM(0xe61500d0)
#define PLL0CR		IOMEM(0xe61500d8)
#define PLL1CR		IOMEM(0xe6150028)
#define PLL2CR		IOMEM(0xe615002c)
#define PLL3CR		IOMEM(0xe61500dc)
#define SMSTPCR0	IOMEM(0xe6150130)
#define SMSTPCR1	IOMEM(0xe6150134)
#define SMSTPCR2	IOMEM(0xe6150138)
#define SMSTPCR3	IOMEM(0xe615013c)
#define SMSTPCR4	IOMEM(0xe6150140)
#define SMSTPCR5	IOMEM(0xe6150144)
#define CKSCR		IOMEM(0xe61500c0)

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

/*
 * 26MHz default rate for the EXTAL1 root input clock.
 * If needed, reset this with clk_set_rate() from the platform code.
 */
struct clk sh73a0_extal1_clk = {
	.rate		= 26000000,
};

/*
 * 48MHz default rate for the EXTAL2 root input clock.
 * If needed, reset this with clk_set_rate() from the platform code.
 */
struct clk sh73a0_extal2_clk = {
	.rate		= 48000000,
};

/* A fixed divide-by-2 block */
static unsigned long div2_recalc(struct clk *clk)
{
	return clk->parent->rate / 2;
}

static struct sh_clk_ops div2_clk_ops = {
	.recalc		= div2_recalc,
};

static unsigned long div7_recalc(struct clk *clk)
{
	return clk->parent->rate / 7;
}

static struct sh_clk_ops div7_clk_ops = {
	.recalc		= div7_recalc,
};

static unsigned long div13_recalc(struct clk *clk)
{
	return clk->parent->rate / 13;
}

static struct sh_clk_ops div13_clk_ops = {
	.recalc		= div13_recalc,
};

/* Divide extal1 by two */
static struct clk extal1_div2_clk = {
	.ops		= &div2_clk_ops,
	.parent		= &sh73a0_extal1_clk,
};

/* Divide extal2 by two */
static struct clk extal2_div2_clk = {
	.ops		= &div2_clk_ops,
	.parent		= &sh73a0_extal2_clk,
};

static struct sh_clk_ops main_clk_ops = {
	.recalc		= followparent_recalc,
};

/* Main clock */
static struct clk main_clk = {
	.ops		= &main_clk_ops,
};

/* Divide Main clock by two */
static struct clk main_div2_clk = {
	.ops		= &div2_clk_ops,
	.parent		= &main_clk,
};

/* PLL0, PLL1, PLL2, PLL3 */
static unsigned long pll_recalc(struct clk *clk)
{
	unsigned long mult = 1;

	if (__raw_readl(PLLECR) & (1 << clk->enable_bit)) {
		mult = (((__raw_readl(clk->enable_reg) >> 24) & 0x3f) + 1);
		/* handle CFG bit for PLL1 and PLL2 */
		switch (clk->enable_bit) {
		case 1:
		case 2:
			if (__raw_readl(clk->enable_reg) & (1 << 20))
				mult *= 2;
		}
	}

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

static struct sh_clk_ops pll_clk_ops = {
	.recalc		= pll_recalc,