linux/arch/sh/kernel/cpu/sh4a/clock-sh7785.c

/*
 * arch/sh/kernel/cpu/sh4a/clock-sh7785.c
 *
 * SH7785 support for the clock framework
 *
 *  Copyright (C) 2007 - 2009  Paul Mundt
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <asm/clock.h>
#include <asm/freq.h>

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

#define FRQMR_CLK_DATA(_name, _shift)	\
static struct clk_priv _name##_data = {	.shift = _shift, }

FRQMR_CLK_DATA(pfc,  0);
FRQMR_CLK_DATA(s3fc, 4);
FRQMR_CLK_DATA(s2fc, 8);
FRQMR_CLK_DATA(mfc, 12);
FRQMR_CLK_DATA(bfc, 16);
FRQMR_CLK_DATA(sfc, 20);
FRQMR_CLK_DATA(ufc, 24);
FRQMR_CLK_DATA(ifc, 28);

static unsigned long frqmr_clk_recalc(struct clk *clk)
{
	struct clk_priv *data = clk->priv;
	unsigned int idx;

	idx = (__raw_readl(FRQMR1) >> data->shift) & 0x000f;

	/*
	 * XXX: PLL1 multiplier is locked for the default clock mode,
	 * when mode pin detection and configuration support is added,
	 * select the multiplier dynamically.
	 */
	return clk->parent->rate * 36 / div2[idx];
}

static struct clk_ops frqmr_clk_ops = {
	.recalc		= frqmr_clk_recalc,
};

/*
 * Default rate for the root input clock, reset this with clk_set_rate()
 * from the platform code.
 */
static struct clk extal_clk = {
	.name		= "extal",
	.id		= -1,
	.rate		= 33333333,
};

static struct clk cpu_clk = {
	.name		= "cpu_clk",		/* Ick */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &ifc_data,
};

static struct clk shyway_clk = {
	.name		= "shyway_clk",		/* SHck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &sfc_data,
};

static struct clk peripheral_clk = {
	.name		= "peripheral_clk",	/* Pck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &pfc_data,
};

static struct clk ddr_clk = {
	.name		= "ddr_clk",		/* DDRck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &mfc_data,
};

static struct clk bus_clk = {
	.name		= "bus_clk",		/* Bck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &bfc_data,
};

static struct clk ga_clk = {
	.name		= "ga_clk",		/* GAck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.priv		= &s2fc_data,
};

static struct clk du_clk = {
	.name		= "du_clk",		/* DUck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.priv		= &s3fc_data,
};

static struct clk umem_clk = {
	.name		= "umem_clk",		/* uck */
	.id		= -1,
	.ops		= &frqmr_clk_ops,
	.parent		= &extal_clk,
	.flags		= CLK_ENABLE_ON_INIT,
	.priv		= &ufc_data,
};

static struct clk *clks[] = {
	&extal_clk,
	&cpu_clk,
	&shyway_clk,
	&peripheral_clk,
	&ddr_clk,
	&bus_clk,
	&ga_clk,
	&du_clk,
	&umem_clk,
};

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

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

	return ret;
}