/*
 * arch/sh/kernel/cpu/sh4a/clock-sh7734.c
 *
 * Clock framework for SH7734
 *
 * Copyright (C) 2011, 2012 Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
 * Copyright (C) 2011, 2012 Renesas Solutions Corp.
 *
 * 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/io.h>
#include <linux/clkdev.h>
#include <linux/delay.h>
#include <asm/clock.h>
#include <asm/freq.h>

static struct clk extal_clk = {
	.rate       = 33333333,
};

#define MODEMR          (0xFFCC0020)
#define MODEMR_MASK     (0x6)
#define MODEMR_533MHZ   (0x2)

static unsigned long pll_recalc(struct clk *clk)
{
	int mode = 12;
	u32 r = __raw_readl(MODEMR);

	if ((r & MODEMR_MASK) & MODEMR_533MHZ)
		mode = 16;

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

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 *main_clks[] = {
	&extal_clk,
	&pll_clk,
};

static int multipliers[] = { 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
static int divisors[] = { 1, 3, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24 };

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

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

enum { DIV4_I, DIV4_S, DIV4_B, DIV4_M, DIV4_S1, DIV4_P, DIV4_NR };

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

struct clk div4_clks[DIV4_NR] = {
	[DIV4_I] = DIV4(FRQMR1, 28, 0x0003, CLK_ENABLE_ON_INIT),
	[DIV4_S] = DIV4(FRQMR1, 20, 0x000C, CLK_ENABLE_ON_INIT),
	[DIV4_B] = DIV4(FRQMR1, 16, 0x0140, CLK_ENABLE_ON_INIT),
	[DIV4_M] = DIV4(FRQMR1, 12, 0x0004, CLK_ENABLE_ON_INIT),
	[DIV4_S1] = DIV4(FRQMR1, 4, 0x0030, CLK_ENABLE_ON_INIT),
	[DIV4_P] = DIV4(FRQMR1, 0, 0x0140, CLK_ENABLE_ON_INIT),
};

#define MSTPCR0	0xFFC80030
#define MSTPCR1	0xFFC80034
#define MSTPCR3	0xFFC8003C

enum {
	MSTP030, MSTP029, /* IIC */
	MSTP026, MSTP025, MSTP024, /* SCIF */
	MSTP023,
	MSTP022, MSTP021,
	MSTP019, /* HSCIF */
	MSTP016, MSTP015, MSTP014, /* TMU / TIMER */
	MSTP012, MSTP011, MSTP010, MSTP009, MSTP008, /* SSI */
	MSTP007, /* HSPI */
	MSTP115, /* ADMAC */
	MSTP114, /* GETHER */
	MSTP111, /* DMAC */
	MSTP109, /* VIDEOIN1 */
	MSTP108, /* VIDEOIN0 */
	MSTP107, /* RGPVBG */
	MSTP106, /* 2DG */
	MSTP103, /* VIEW */
	MSTP100, /* USB */
	MSTP331, /* MMC */
	MSTP330, /* MIMLB */
	MSTP323, /* SDHI0 */
	MSTP322, /* SDHI1 */
	MSTP321, /* SDHI2 */
	MSTP320, /* RQSPI */
	MSTP319, /* SRC0 */
	MSTP318, /* SRC1 */
	MSTP317, /* RSPI */
	MSTP316, /* RCAN0 */
	MSTP315, /* RCAN1 */
	MSTP314, /* FLTCL */
	MSTP313, /* ADC */
	MSTP312, /* MTU */
	MSTP304, /* IE-BUS */
	MSTP303, /* RTC */
	MSTP302, /* HIF */
	MSTP301, /* STIF0 */
	MSTP300, /* STIF1 */
	MSTP_NR };

static struct clk mstp_clks[MSTP_NR] = {
	/* MSTPCR0 */
	[MSTP030] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 30, 0),
	[MSTP029] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 29, 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),
	[MSTP023] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 23, 0),
	[MSTP022] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 22, 0),
	[MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0),
	[MSTP019] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 19, 0),
	[MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0),
	[MSTP015] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
	[MSTP014] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 14, 0),
	[MSTP012] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 12, 0),
	[MSTP011] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 11, 0),
	[MSTP010] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
	[MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
	[MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
	[MSTP007] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 7, 0),

	/* MSTPCR1 */
	[MSTP115] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 15, 0),
	[MSTP114] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 14, 0),
	[MSTP111] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 11, 0),
	[MSTP109] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 9, 0),
	[MSTP108] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 8, 0),
	[MSTP107] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 7, 0),
	[MSTP106] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 6, 0),
	[MSTP103] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 3, 0),
	[MSTP100] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 0, 0),

	/* MSTPCR3 */
	[MSTP331] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 31, 0),
	[MSTP330] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 30, 0),
	[MSTP323] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 23, 0),
	[MSTP322] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 22, 0),
	[MSTP321] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 21, 0),
	[MSTP320] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 20, 0),
	[MSTP319] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 19, 0),
	[MSTP318] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 18, 0),
	[MSTP317] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 17, 0),
	[MSTP316] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 16, 0),
	[MSTP315] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 15, 0),
	[MSTP314] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 14, 0),
	[MSTP313] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 13, 0),
	[MSTP312] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3, 12, 0),
	[MSTP304] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3,  4, 0),
	[MSTP303] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3,  3, 0),
	[MSTP302] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3,  2, 0),
	[MSTP301] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3,  1, 0),
	[MSTP300] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR3,  0, 0),
};

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

	/* clocks */
	CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
	CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_S]),
	CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_M]),
	CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
	CLKDEV_CON_ID("shyway_clk1", &div4_clks[DIV4_S1]),
	CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),

	/* MSTP32 clocks */
	CLKDEV_DEV_ID("i2c-sh7734.0", &mstp_clks[MSTP030]),
	CLKDEV_DEV_ID("i2c-sh7734.1", &mstp_clks[MSTP029]),
	CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP026]),
	CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP025]),
	CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP024]),
	CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP023]),
	CLKDEV_ICK_ID("fck", "sh-sci.4", &mstp_clks[MSTP022]),
	CLKDEV_ICK_ID("fck", "sh-sci.5", &mstp_clks[MSTP021]),
	CLKDEV_CON_ID("hscif", &mstp_clks[MSTP019]),
	CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP016]),
	CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP015]),
	CLKDEV_ICK_ID("fck", "sh-tmu.2", &mstp_clks[MSTP014]),
	CLKDEV_CON_ID("ssi0", &mstp_clks[MSTP012]),
	CLKDEV_CON_ID("ssi1", &mstp_clks[MSTP011]),
	CLKDEV_CON_ID("ssi2", &mstp_clks[MSTP010]),
	CLKDEV_CON_ID("ssi3", &mstp_clks[MSTP009]),
	CLKDEV_CON_ID("sss", &mstp_clks[MSTP008]),
	CLKDEV_CON_ID("hspi", &mstp_clks[MSTP007]),
	CLKDEV_CON_ID("usb_fck", &mstp_clks[MSTP100]),
	CLKDEV_CON_ID("videoin0", &mstp_clks[MSTP109]),
	CLKDEV_CON_ID("videoin1", &mstp_clks[MSTP108]),
	CLKDEV_CON_ID("rgpvg", &mstp_clks[MSTP107]),
	CLKDEV_CON_ID("2dg", &mstp_clks[MSTP106]),
	CLKDEV_CON_ID("view", &mstp_clks[MSTP103]),

	CLKDEV_CON_ID("mmc0", &mstp_clks[MSTP331]),
	CLKDEV_CON_ID("mimlb0", &mstp_clks[MSTP330]),
	CLKDEV_CON_ID("sdhi0", &mstp_clks[MSTP323]),
	CLKDEV_CON_ID("sdhi1", &mstp_clks[MSTP322]),
	CLKDEV_CON_ID("sdhi2", &mstp_clks[MSTP321]),
	CLKDEV_CON_ID("rqspi0", &mstp_clks[MSTP320]),
	CLKDEV_CON_ID("src0", &mstp_clks[MSTP319]),
	CLKDEV_CON_ID("src1", &mstp_clks[MSTP318]),
	CLKDEV_CON_ID("rsp0", &mstp_clks[MSTP317]),
	CLKDEV_CON_ID("rcan0", &mstp_clks[MSTP316]),
	CLKDEV_CON_ID("rcan1", &mstp_clks[MSTP315]),
	CLKDEV_CON_ID("fltcl0", &mstp_clks[MSTP314]),
	CLKDEV_CON_ID("adc0", &mstp_clks[MSTP313]),
	CLKDEV_CON_ID("mtu0", &mstp_clks[MSTP312]),
	CLKDEV_CON_ID("iebus0", &mstp_clks[MSTP304]),
	CLKDEV_DEV_ID("sh7734-gether.0", &mstp_clks[MSTP114]),
	CLKDEV_CON_ID("rtc0", &mstp_clks[MSTP303]),
	CLKDEV_CON_ID("hif0", &mstp_clks[MSTP302]),
	CLKDEV_CON_ID("stif0", &mstp_clks[MSTP301]),
	CLKDEV_CON_ID("stif1", &mstp_clks[MSTP300]),
};

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

	for (i = 0; i < ARRAY_SIZE(main_clks); i++)
		ret |= clk_register(main_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;
}