[deliverable/linux.git] / arch / arm / mach-ep93xx / clock.c

/*
 * arch/arm/mach-ep93xx/clock.c
 * Clock control for Cirrus EP93xx chips.
 *
 * Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
 *
 * 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, or (at
 * your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/io.h>
#include <linux/spinlock.h>

#include <mach/hardware.h>

#include <asm/clkdev.h>
#include <asm/div64.h>


struct clk {
	struct clk	*parent;
	unsigned long	rate;
	int		users;
	int		sw_locked;
	void __iomem	*enable_reg;
	u32		enable_mask;

	unsigned long	(*get_rate)(struct clk *clk);
	int		(*set_rate)(struct clk *clk, unsigned long rate);
};


static unsigned long get_uart_rate(struct clk *clk);

static int set_keytchclk_rate(struct clk *clk, unsigned long rate);
static int set_div_rate(struct clk *clk, unsigned long rate);


static struct clk clk_xtali = {
	.rate		= EP93XX_EXT_CLK_RATE,
};
static struct clk clk_uart1 = {
	.parent		= &clk_xtali,
	.sw_locked	= 1,
	.enable_reg	= EP93XX_SYSCON_DEVCFG,
	.enable_mask	= EP93XX_SYSCON_DEVCFG_U1EN,
	.get_rate	= get_uart_rate,
};
static struct clk clk_uart2 = {
	.parent		= &clk_xtali,
	.sw_locked	= 1,
	.enable_reg	= EP93XX_SYSCON_DEVCFG,
	.enable_mask	= EP93XX_SYSCON_DEVCFG_U2EN,
	.get_rate	= get_uart_rate,
};
static struct clk clk_uart3 = {
	.parent		= &clk_xtali,
	.sw_locked	= 1,
	.enable_reg	= EP93XX_SYSCON_DEVCFG,
	.enable_mask	= EP93XX_SYSCON_DEVCFG_U3EN,
	.get_rate	= get_uart_rate,
};
static struct clk clk_pll1 = {
	.parent		= &clk_xtali,
};
static struct clk clk_f = {
	.parent		= &clk_pll1,
};
static struct clk clk_h = {
	.parent		= &clk_pll1,
};
static struct clk clk_p = {
	.parent		= &clk_pll1,
};
static struct clk clk_pll2 = {
	.parent		= &clk_xtali,
};
static struct clk clk_usb_host = {
	.parent		= &clk_pll2,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_USH_EN,
};
static struct clk clk_keypad = {
	.parent		= &clk_xtali,
	.sw_locked	= 1,
	.enable_reg	= EP93XX_SYSCON_KEYTCHCLKDIV,
	.enable_mask	= EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
	.set_rate	= set_keytchclk_rate,
};
static struct clk clk_pwm = {
	.parent		= &clk_xtali,
	.rate		= EP93XX_EXT_CLK_RATE,
};

static struct clk clk_video = {
	.sw_locked	= 1,
	.enable_reg     = EP93XX_SYSCON_VIDCLKDIV,
	.enable_mask    = EP93XX_SYSCON_CLKDIV_ENABLE,
	.set_rate	= set_div_rate,
};

/* DMA Clocks */
static struct clk clk_m2p0 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P0,
};
static struct clk clk_m2p1 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P1,
};
static struct clk clk_m2p2 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P2,
};
static struct clk clk_m2p3 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P3,
};
static struct clk clk_m2p4 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P4,
};
static struct clk clk_m2p5 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P5,
};
static struct clk clk_m2p6 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P6,
};
static struct clk clk_m2p7 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P7,
};
static struct clk clk_m2p8 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P8,
};
static struct clk clk_m2p9 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2P9,
};
static struct clk clk_m2m0 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2M0,
};
static struct clk clk_m2m1 = {
	.parent		= &clk_h,
	.enable_reg	= EP93XX_SYSCON_PWRCNT,
	.enable_mask	= EP93XX_SYSCON_PWRCNT_DMA_M2M1,
};

#define INIT_CK(dev,con,ck)					\
	{ .dev_id = dev, .con_id = con, .clk = ck }

static struct clk_lookup clocks[] = {
	INIT_CK(NULL,			"xtali",	&clk_xtali),
	INIT_CK("apb:uart1",		NULL,		&clk_uart1),
	INIT_CK("apb:uart2",		NULL,		&clk_uart2),
	INIT_CK("apb:uart3",		NULL,		&clk_uart3),
	INIT_CK(NULL,			"pll1",		&clk_pll1),
	INIT_CK(NULL,			"fclk",		&clk_f),
	INIT_CK(NULL,			"hclk",		&clk_h),
	INIT_CK(NULL,			"pclk",		&clk_p),
	INIT_CK(NULL,			"pll2",		&clk_pll2),
	INIT_CK("ep93xx-ohci",		NULL,		&clk_usb_host),
	INIT_CK("ep93xx-keypad",	NULL,		&clk_keypad),
	INIT_CK("ep93xx-fb",		NULL,		&clk_video),
	INIT_CK(NULL,			"pwm_clk",	&clk_pwm),
	INIT_CK(NULL,			"m2p0",		&clk_m2p0),
	INIT_CK(NULL,			"m2p1",		&clk_m2p1),
	INIT_CK(NULL,			"m2p2",		&clk_m2p2),
	INIT_CK(NULL,			"m2p3",		&clk_m2p3),
	INIT_CK(NULL,			"m2p4",		&clk_m2p4),
	INIT_CK(NULL,			"m2p5",		&clk_m2p5),
	INIT_CK(NULL,			"m2p6",		&clk_m2p6),
	INIT_CK(NULL,			"m2p7",		&clk_m2p7),
	INIT_CK(NULL,			"m2p8",		&clk_m2p8),
	INIT_CK(NULL,			"m2p9",		&clk_m2p9),
	INIT_CK(NULL,			"m2m0",		&clk_m2m0),
	INIT_CK(NULL,			"m2m1",		&clk_m2m1),
};

static DEFINE_SPINLOCK(clk_lock);

static void __clk_enable(struct clk *clk)
{
	if (!clk->users++) {
		if (clk->parent)
			__clk_enable(clk->parent);

		if (clk->enable_reg) {
			u32 v;

			v = __raw_readl(clk->enable_reg);
			v |= clk->enable_mask;
			if (clk->sw_locked)
				ep93xx_syscon_swlocked_write(v, clk->enable_reg);
			else
				__raw_writel(v, clk->enable_reg);
		}
	}
}

int clk_enable(struct clk *clk)
{
	unsigned long flags;

	if (!clk)
		return -EINVAL;

	spin_lock_irqsave(&clk_lock, flags);
	__clk_enable(clk);
	spin_unlock_irqrestore(&clk_lock, flags);

	return 0;
}
EXPORT_SYMBOL(clk_enable);

static void __clk_disable(struct clk *clk)
{
	if (!--clk->users) {
		if (clk->enable_reg) {
			u32 v;

			v = __raw_readl(clk->enable_reg);
			v &= ~clk->enable_mask;
			if (clk->sw_locked)
				ep93xx_syscon_swlocked_write(v, clk->enable_reg);
			else
				__raw_writel(v, clk->enable_reg);
		}

		if (clk->parent)
			__clk_disable(clk->parent);
	}
}

void clk_disable(struct clk *clk)
{
	unsigned long flags;

	if (!clk)
		return;

	spin_lock_irqsave(&clk_lock, flags);
	__clk_disable(clk);
	spin_unlock_irqrestore(&clk_lock, flags);
}
EXPORT_SYMBOL(clk_disable);

static unsigned long get_uart_rate(struct clk *clk)
{
	unsigned long rate = clk_get_rate(clk->parent);
	u32 value;

	value = __raw_readl(EP93XX_SYSCON_PWRCNT);
	if (value & EP93XX_SYSCON_PWRCNT_UARTBAUD)
		return rate;
	else
		return rate / 2;
}

unsigned long clk_get_rate(struct clk *clk)
{
	if (clk->get_rate)
		return clk->get_rate(clk);

	return clk->rate;
}
EXPORT_SYMBOL(clk_get_rate);

static int set_keytchclk_rate(struct clk *clk, unsigned long rate)
{
	u32 val;
	u32 div_bit;

	val = __raw_readl(clk->enable_reg);

	/*
	 * The Key Matrix and ADC clocks are configured using the same
	 * System Controller register.  The clock used will be either
	 * 1/4 or 1/16 the external clock rate depending on the
	 * EP93XX_SYSCON_KEYTCHCLKDIV_KDIV/EP93XX_SYSCON_KEYTCHCLKDIV_ADIV
	 * bit being set or cleared.
	 */
	div_bit = clk->enable_mask >> 15;

	if (rate == EP93XX_KEYTCHCLK_DIV4)
		val |= div_bit;
	else if (rate == EP93XX_KEYTCHCLK_DIV16)
		val &= ~div_bit;
	else
		return -EINVAL;

	ep93xx_syscon_swlocked_write(val, clk->enable_reg);
	clk->rate = rate;
	return 0;
}

static int calc_clk_div(struct clk *clk, unsigned long rate,
			int *psel, int *esel, int *pdiv, int *div)
{
	struct clk *mclk;
	unsigned long max_rate, actual_rate, mclk_rate, rate_err = -1;
	int i, found = 0, __div = 0, __pdiv = 0;

	/* Don't exceed the maximum rate */
	max_rate = max(max(clk_pll1.rate / 4, clk_pll2.rate / 4),
		       clk_xtali.rate / 4);
	rate = min(rate, max_rate);

	/*
	 * Try the two pll's and the external clock
	 * Because the valid predividers are 2, 2.5 and 3, we multiply
	 * all the clocks by 2 to avoid floating point math.
	 *
	 * This is based on the algorithm in the ep93xx raster guide:
	 * http://be-a-maverick.com/en/pubs/appNote/AN269REV1.pdf
	 *
	 */
	for (i = 0; i < 3; i++) {
		if (i == 0)
			mclk = &clk_xtali;
		else if (i == 1)
			mclk = &clk_pll1;
		else
			mclk = &clk_pll2;
		mclk_rate = mclk->rate * 2;

		/* Try each predivider value */
		for (__pdiv = 4; __pdiv <= 6; __pdiv++) {
			__div = mclk_rate / (rate * __pdiv);
			if (__div < 2 || __div > 127)
				continue;

			actual_rate = mclk_rate / (__pdiv * __div);

			if (!found || abs(actual_rate - rate) < rate_err) {
				*pdiv = __pdiv - 3;
				*div = __div;
				*psel = (i == 2);
				*esel = (i != 0);
				clk->parent = mclk;
				clk->rate = actual_rate;
				rate_err = abs(actual_rate - rate);
				found = 1;
			}
		}
	}

	if (!found)
		return -EINVAL;

	return 0;
}

static int set_div_rate(struct clk *clk, unsigned long rate)
{
	int err, psel = 0, esel = 0, pdiv = 0, div = 0;
	u32 val;

	err = calc_clk_div(clk, rate, &psel, &esel, &pdiv, &div);
	if (err)
		return err;

	/* Clear the esel, psel, pdiv and div bits */
	val = __raw_readl(clk->enable_reg);
	val &= ~0x7fff;

	/* Set the new esel, psel, pdiv and div bits for the new clock rate */
	val |= (esel ? EP93XX_SYSCON_CLKDIV_ESEL : 0) |
		(psel ? EP93XX_SYSCON_CLKDIV_PSEL : 0) |
		(pdiv << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) | div;
	ep93xx_syscon_swlocked_write(val, clk->enable_reg);
	return 0;
}

int clk_set_rate(struct clk *clk, unsigned long rate)
{
	if (clk->set_rate)
		return clk->set_rate(clk, rate);

	return -EINVAL;
}
EXPORT_SYMBOL(clk_set_rate);


static char fclk_divisors[] = { 1, 2, 4, 8, 16, 1, 1, 1 };
static char hclk_divisors[] = { 1, 2, 4, 5, 6, 8, 16, 32 };
static char pclk_divisors[] = { 1, 2, 4, 8 };

/*
 * PLL rate = 14.7456 MHz * (X1FBD + 1) * (X2FBD + 1) / (X2IPD + 1) / 2^PS
 */
static unsigned long calc_pll_rate(u32 config_word)
{
	unsigned long long rate;
	int i;

	rate = clk_xtali.rate;
	rate *= ((config_word >> 11) & 0x1f) + 1;		/* X1FBD */
	rate *= ((config_word >> 5) & 0x3f) + 1;		/* X2FBD */
	do_div(rate, (config_word & 0x1f) + 1);			/* X2IPD */
	for (i = 0; i < ((config_word >> 16) & 3); i++)		/* PS */
		rate >>= 1;

	return (unsigned long)rate;
}

static void __init ep93xx_dma_clock_init(void)
{
	clk_m2p0.rate = clk_h.rate;
	clk_m2p1.rate = clk_h.rate;
	clk_m2p2.rate = clk_h.rate;
	clk_m2p3.rate = clk_h.rate;
	clk_m2p4.rate = clk_h.rate;
	clk_m2p5.rate = clk_h.rate;
	clk_m2p6.rate = clk_h.rate;
	clk_m2p7.rate = clk_h.rate;
	clk_m2p8.rate = clk_h.rate;
	clk_m2p9.rate = clk_h.rate;
	clk_m2m0.rate = clk_h.rate;
	clk_m2m1.rate = clk_h.rate;
}

static int __init ep93xx_clock_init(void)
{
	u32 value;

	value = __raw_readl(EP93XX_SYSCON_CLOCK_SET1);
	if (!(value & 0x00800000)) {			/* PLL1 bypassed?  */
		clk_pll1.rate = clk_xtali.rate;
	} else {
		clk_pll1.rate = calc_pll_rate(value);
	}
	clk_f.rate = clk_pll1.rate / fclk_divisors[(value >> 25) & 0x7];
	clk_h.rate = clk_pll1.rate / hclk_divisors[(value >> 20) & 0x7];
	clk_p.rate = clk_h.rate / pclk_divisors[(value >> 18) & 0x3];
	ep93xx_dma_clock_init();

	value = __raw_readl(EP93XX_SYSCON_CLOCK_SET2);
	if (!(value & 0x00080000)) {			/* PLL2 bypassed?  */
		clk_pll2.rate = clk_xtali.rate;
	} else if (value & 0x00040000) {		/* PLL2 enabled?  */
		clk_pll2.rate = calc_pll_rate(value);
	} else {
		clk_pll2.rate = 0;
	}
	clk_usb_host.rate = clk_pll2.rate / (((value >> 28) & 0xf) + 1);

	printk(KERN_INFO "ep93xx: PLL1 running at %ld MHz, PLL2 at %ld MHz\n",
		clk_pll1.rate / 1000000, clk_pll2.rate / 1000000);
	printk(KERN_INFO "ep93xx: FCLK %ld MHz, HCLK %ld MHz, PCLK %ld MHz\n",
		clk_f.rate / 1000000, clk_h.rate / 1000000,
		clk_p.rate / 1000000);

	clkdev_add_table(clocks, ARRAY_SIZE(clocks));
	return 0;
}
arch_initcall(ep93xx_clock_init);
Commit	Line	Data
	1	/*
	2	* arch/arm/mach-ep93xx/clock.c
	3	* Clock control for Cirrus EP93xx chips.
	4	*
	5	* Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or (at
	10	* your option) any later version.
	11	*/
	12
	13	#include <linux/kernel.h>
	14	#include <linux/clk.h>
	15	#include <linux/err.h>
	16	#include <linux/module.h>
	17	#include <linux/string.h>
	18	#include <linux/io.h>
	19	#include <linux/spinlock.h>
	20
	21	#include <mach/hardware.h>
	22
	23	#include <asm/clkdev.h>
	24	#include <asm/div64.h>
	25
	26
	27	struct clk {
	28	struct clk *parent;
	29	unsigned long rate;
	30	int users;
	31	int sw_locked;
	32	void __iomem *enable_reg;
	33	u32 enable_mask;
	34
	35	unsigned long (get_rate)(struct clk clk);
	36	int (set_rate)(struct clk clk, unsigned long rate);
	37	};
	38
	39
	40	static unsigned long get_uart_rate(struct clk *clk);
	41
	42	static int set_keytchclk_rate(struct clk *clk, unsigned long rate);
	43	static int set_div_rate(struct clk *clk, unsigned long rate);
	44
	45
	46	static struct clk clk_xtali = {
	47	.rate = EP93XX_EXT_CLK_RATE,
	48	};
	49	static struct clk clk_uart1 = {
	50	.parent = &clk_xtali,
	51	.sw_locked = 1,
	52	.enable_reg = EP93XX_SYSCON_DEVCFG,
	53	.enable_mask = EP93XX_SYSCON_DEVCFG_U1EN,
	54	.get_rate = get_uart_rate,
	55	};
	56	static struct clk clk_uart2 = {
	57	.parent = &clk_xtali,
	58	.sw_locked = 1,
	59	.enable_reg = EP93XX_SYSCON_DEVCFG,
	60	.enable_mask = EP93XX_SYSCON_DEVCFG_U2EN,
	61	.get_rate = get_uart_rate,
	62	};
	63	static struct clk clk_uart3 = {
	64	.parent = &clk_xtali,
	65	.sw_locked = 1,
	66	.enable_reg = EP93XX_SYSCON_DEVCFG,
	67	.enable_mask = EP93XX_SYSCON_DEVCFG_U3EN,
	68	.get_rate = get_uart_rate,
	69	};
	70	static struct clk clk_pll1 = {
	71	.parent = &clk_xtali,
	72	};
	73	static struct clk clk_f = {
	74	.parent = &clk_pll1,
	75	};
	76	static struct clk clk_h = {
	77	.parent = &clk_pll1,
	78	};
	79	static struct clk clk_p = {
	80	.parent = &clk_pll1,
	81	};
	82	static struct clk clk_pll2 = {
	83	.parent = &clk_xtali,
	84	};
	85	static struct clk clk_usb_host = {
	86	.parent = &clk_pll2,
	87	.enable_reg = EP93XX_SYSCON_PWRCNT,
	88	.enable_mask = EP93XX_SYSCON_PWRCNT_USH_EN,
	89	};
	90	static struct clk clk_keypad = {
	91	.parent = &clk_xtali,
	92	.sw_locked = 1,
	93	.enable_reg = EP93XX_SYSCON_KEYTCHCLKDIV,
	94	.enable_mask = EP93XX_SYSCON_KEYTCHCLKDIV_KEN,
	95	.set_rate = set_keytchclk_rate,
	96	};
	97	static struct clk clk_pwm = {
	98	.parent = &clk_xtali,
	99	.rate = EP93XX_EXT_CLK_RATE,
	100	};
	101
	102	static struct clk clk_video = {
	103	.sw_locked = 1,
	104	.enable_reg = EP93XX_SYSCON_VIDCLKDIV,
	105	.enable_mask = EP93XX_SYSCON_CLKDIV_ENABLE,
	106	.set_rate = set_div_rate,
	107	};
	108
	109	/* DMA Clocks */
	110	static struct clk clk_m2p0 = {
	111	.parent = &clk_h,
	112	.enable_reg = EP93XX_SYSCON_PWRCNT,
	113	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P0,
	114	};
	115	static struct clk clk_m2p1 = {
	116	.parent = &clk_h,
	117	.enable_reg = EP93XX_SYSCON_PWRCNT,
	118	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P1,
	119	};
	120	static struct clk clk_m2p2 = {
	121	.parent = &clk_h,
	122	.enable_reg = EP93XX_SYSCON_PWRCNT,
	123	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P2,
	124	};
	125	static struct clk clk_m2p3 = {
	126	.parent = &clk_h,
	127	.enable_reg = EP93XX_SYSCON_PWRCNT,
	128	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P3,
	129	};
	130	static struct clk clk_m2p4 = {
	131	.parent = &clk_h,
	132	.enable_reg = EP93XX_SYSCON_PWRCNT,
	133	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P4,
	134	};
	135	static struct clk clk_m2p5 = {
	136	.parent = &clk_h,
	137	.enable_reg = EP93XX_SYSCON_PWRCNT,
	138	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P5,
	139	};
	140	static struct clk clk_m2p6 = {
	141	.parent = &clk_h,
	142	.enable_reg = EP93XX_SYSCON_PWRCNT,
	143	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P6,
	144	};
	145	static struct clk clk_m2p7 = {
	146	.parent = &clk_h,
	147	.enable_reg = EP93XX_SYSCON_PWRCNT,
	148	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P7,
	149	};
	150	static struct clk clk_m2p8 = {
	151	.parent = &clk_h,
	152	.enable_reg = EP93XX_SYSCON_PWRCNT,
	153	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P8,
	154	};
	155	static struct clk clk_m2p9 = {
	156	.parent = &clk_h,
	157	.enable_reg = EP93XX_SYSCON_PWRCNT,
	158	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2P9,
	159	};
	160	static struct clk clk_m2m0 = {
	161	.parent = &clk_h,
	162	.enable_reg = EP93XX_SYSCON_PWRCNT,
	163	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2M0,
	164	};
	165	static struct clk clk_m2m1 = {
	166	.parent = &clk_h,
	167	.enable_reg = EP93XX_SYSCON_PWRCNT,
	168	.enable_mask = EP93XX_SYSCON_PWRCNT_DMA_M2M1,
	169	};
	170
	171	#define INIT_CK(dev,con,ck) \
	172	{ .dev_id = dev, .con_id = con, .clk = ck }
	173
	174	static struct clk_lookup clocks[] = {
	175	INIT_CK(NULL, "xtali", &clk_xtali),
	176	INIT_CK("apb:uart1", NULL, &clk_uart1),
	177	INIT_CK("apb:uart2", NULL, &clk_uart2),
	178	INIT_CK("apb:uart3", NULL, &clk_uart3),
	179	INIT_CK(NULL, "pll1", &clk_pll1),
	180	INIT_CK(NULL, "fclk", &clk_f),
	181	INIT_CK(NULL, "hclk", &clk_h),
	182	INIT_CK(NULL, "pclk", &clk_p),
	183	INIT_CK(NULL, "pll2", &clk_pll2),
	184	INIT_CK("ep93xx-ohci", NULL, &clk_usb_host),
	185	INIT_CK("ep93xx-keypad", NULL, &clk_keypad),
	186	INIT_CK("ep93xx-fb", NULL, &clk_video),
	187	INIT_CK(NULL, "pwm_clk", &clk_pwm),
	188	INIT_CK(NULL, "m2p0", &clk_m2p0),
	189	INIT_CK(NULL, "m2p1", &clk_m2p1),
	190	INIT_CK(NULL, "m2p2", &clk_m2p2),
	191	INIT_CK(NULL, "m2p3", &clk_m2p3),
	192	INIT_CK(NULL, "m2p4", &clk_m2p4),
	193	INIT_CK(NULL, "m2p5", &clk_m2p5),
	194	INIT_CK(NULL, "m2p6", &clk_m2p6),
	195	INIT_CK(NULL, "m2p7", &clk_m2p7),
	196	INIT_CK(NULL, "m2p8", &clk_m2p8),
	197	INIT_CK(NULL, "m2p9", &clk_m2p9),
	198	INIT_CK(NULL, "m2m0", &clk_m2m0),
	199	INIT_CK(NULL, "m2m1", &clk_m2m1),
	200	};
	201
	202	static DEFINE_SPINLOCK(clk_lock);
	203
	204	static void __clk_enable(struct clk *clk)
	205	{
	206	if (!clk->users++) {
	207	if (clk->parent)
	208	__clk_enable(clk->parent);
	209
	210	if (clk->enable_reg) {
	211	u32 v;
	212
	213	v = __raw_readl(clk->enable_reg);
	214	v \|= clk->enable_mask;
	215	if (clk->sw_locked)
	216	ep93xx_syscon_swlocked_write(v, clk->enable_reg);
	217	else
	218	__raw_writel(v, clk->enable_reg);
	219	}
	220	}
	221	}
	222
	223	int clk_enable(struct clk *clk)
	224	{
	225	unsigned long flags;
	226
	227	if (!clk)
	228	return -EINVAL;
	229
	230	spin_lock_irqsave(&clk_lock, flags);
	231	__clk_enable(clk);
	232	spin_unlock_irqrestore(&clk_lock, flags);
	233
	234	return 0;
	235	}
	236	EXPORT_SYMBOL(clk_enable);
	237
	238	static void __clk_disable(struct clk *clk)
	239	{
	240	if (!--clk->users) {
	241	if (clk->enable_reg) {
	242	u32 v;
	243
	244	v = __raw_readl(clk->enable_reg);
	245	v &= ~clk->enable_mask;
	246	if (clk->sw_locked)
	247	ep93xx_syscon_swlocked_write(v, clk->enable_reg);
	248	else
	249	__raw_writel(v, clk->enable_reg);
	250	}
	251
	252	if (clk->parent)
	253	__clk_disable(clk->parent);
	254	}
	255	}
	256
	257	void clk_disable(struct clk *clk)
	258	{
	259	unsigned long flags;
	260
	261	if (!clk)
	262	return;
	263
	264	spin_lock_irqsave(&clk_lock, flags);
	265	__clk_disable(clk);
	266	spin_unlock_irqrestore(&clk_lock, flags);
	267	}
	268	EXPORT_SYMBOL(clk_disable);
	269
	270	static unsigned long get_uart_rate(struct clk *clk)
	271	{
	272	unsigned long rate = clk_get_rate(clk->parent);
	273	u32 value;
	274
	275	value = __raw_readl(EP93XX_SYSCON_PWRCNT);
	276	if (value & EP93XX_SYSCON_PWRCNT_UARTBAUD)
	277	return rate;
	278	else
	279	return rate / 2;
	280	}
	281
	282	unsigned long clk_get_rate(struct clk *clk)
	283	{
	284	if (clk->get_rate)
	285	return clk->get_rate(clk);
	286
	287	return clk->rate;
	288	}
	289	EXPORT_SYMBOL(clk_get_rate);
	290
	291	static int set_keytchclk_rate(struct clk *clk, unsigned long rate)
	292	{
	293	u32 val;
	294	u32 div_bit;
	295
	296	val = __raw_readl(clk->enable_reg);
	297
	298	/*
	299	* The Key Matrix and ADC clocks are configured using the same
	300	* System Controller register. The clock used will be either
	301	* 1/4 or 1/16 the external clock rate depending on the
	302	* EP93XX_SYSCON_KEYTCHCLKDIV_KDIV/EP93XX_SYSCON_KEYTCHCLKDIV_ADIV
	303	* bit being set or cleared.
	304	*/
	305	div_bit = clk->enable_mask >> 15;
	306
	307	if (rate == EP93XX_KEYTCHCLK_DIV4)
	308	val \|= div_bit;
	309	else if (rate == EP93XX_KEYTCHCLK_DIV16)
	310	val &= ~div_bit;
	311	else
	312	return -EINVAL;
	313
	314	ep93xx_syscon_swlocked_write(val, clk->enable_reg);
	315	clk->rate = rate;
	316	return 0;
	317	}
	318
	319	static int calc_clk_div(struct clk *clk, unsigned long rate,
	320	int psel, int esel, int pdiv, int div)
	321	{
	322	struct clk *mclk;
	323	unsigned long max_rate, actual_rate, mclk_rate, rate_err = -1;
	324	int i, found = 0, __div = 0, __pdiv = 0;
	325
	326	/* Don't exceed the maximum rate */
	327	max_rate = max(max(clk_pll1.rate / 4, clk_pll2.rate / 4),
	328	clk_xtali.rate / 4);
	329	rate = min(rate, max_rate);
	330
	331	/*
	332	* Try the two pll's and the external clock
	333	* Because the valid predividers are 2, 2.5 and 3, we multiply
	334	* all the clocks by 2 to avoid floating point math.
	335	*
	336	* This is based on the algorithm in the ep93xx raster guide:
	337	* http://be-a-maverick.com/en/pubs/appNote/AN269REV1.pdf
	338	*
	339	*/
	340	for (i = 0; i < 3; i++) {
	341	if (i == 0)
	342	mclk = &clk_xtali;
	343	else if (i == 1)
	344	mclk = &clk_pll1;
	345	else
	346	mclk = &clk_pll2;
	347	mclk_rate = mclk->rate * 2;
	348
	349	/* Try each predivider value */
	350	for (__pdiv = 4; __pdiv <= 6; __pdiv++) {
	351	__div = mclk_rate / (rate * __pdiv);
	352	if (__div < 2 \|\| __div > 127)
	353	continue;
	354
	355	actual_rate = mclk_rate / (__pdiv * __div);
	356
	357	if (!found \|\| abs(actual_rate - rate) < rate_err) {
	358	*pdiv = __pdiv - 3;
	359	*div = __div;
	360	*psel = (i == 2);
	361	*esel = (i != 0);
	362	clk->parent = mclk;
	363	clk->rate = actual_rate;
	364	rate_err = abs(actual_rate - rate);
	365	found = 1;
	366	}
	367	}
	368	}
	369
	370	if (!found)
	371	return -EINVAL;
	372
	373	return 0;
	374	}
	375
	376	static int set_div_rate(struct clk *clk, unsigned long rate)
	377	{
	378	int err, psel = 0, esel = 0, pdiv = 0, div = 0;
	379	u32 val;
	380
	381	err = calc_clk_div(clk, rate, &psel, &esel, &pdiv, &div);
	382	if (err)
	383	return err;
	384
	385	/* Clear the esel, psel, pdiv and div bits */
	386	val = __raw_readl(clk->enable_reg);
	387	val &= ~0x7fff;
	388
	389	/* Set the new esel, psel, pdiv and div bits for the new clock rate */
	390	val \|= (esel ? EP93XX_SYSCON_CLKDIV_ESEL : 0) \|
	391	(psel ? EP93XX_SYSCON_CLKDIV_PSEL : 0) \|
	392	(pdiv << EP93XX_SYSCON_CLKDIV_PDIV_SHIFT) \| div;
	393	ep93xx_syscon_swlocked_write(val, clk->enable_reg);
	394	return 0;
	395	}
	396
	397	int clk_set_rate(struct clk *clk, unsigned long rate)
	398	{
	399	if (clk->set_rate)
	400	return clk->set_rate(clk, rate);
	401
	402	return -EINVAL;
	403	}
	404	EXPORT_SYMBOL(clk_set_rate);
	405
	406
	407	static char fclk_divisors[] = { 1, 2, 4, 8, 16, 1, 1, 1 };
	408	static char hclk_divisors[] = { 1, 2, 4, 5, 6, 8, 16, 32 };
	409	static char pclk_divisors[] = { 1, 2, 4, 8 };
	410
	411	/*
	412	* PLL rate = 14.7456 MHz * (X1FBD + 1) * (X2FBD + 1) / (X2IPD + 1) / 2^PS
	413	*/
	414	static unsigned long calc_pll_rate(u32 config_word)
	415	{
	416	unsigned long long rate;
	417	int i;
	418
	419	rate = clk_xtali.rate;
	420	rate = ((config_word >> 11) & 0x1f) + 1; / X1FBD */
	421	rate = ((config_word >> 5) & 0x3f) + 1; / X2FBD */
	422	do_div(rate, (config_word & 0x1f) + 1); /* X2IPD */
	423	for (i = 0; i < ((config_word >> 16) & 3); i++) /* PS */
	424	rate >>= 1;
	425
	426	return (unsigned long)rate;
	427	}
	428
	429	static void __init ep93xx_dma_clock_init(void)
	430	{
	431	clk_m2p0.rate = clk_h.rate;
	432	clk_m2p1.rate = clk_h.rate;
	433	clk_m2p2.rate = clk_h.rate;
	434	clk_m2p3.rate = clk_h.rate;
	435	clk_m2p4.rate = clk_h.rate;
	436	clk_m2p5.rate = clk_h.rate;
	437	clk_m2p6.rate = clk_h.rate;
	438	clk_m2p7.rate = clk_h.rate;
	439	clk_m2p8.rate = clk_h.rate;
	440	clk_m2p9.rate = clk_h.rate;
	441	clk_m2m0.rate = clk_h.rate;
	442	clk_m2m1.rate = clk_h.rate;
	443	}
	444
	445	static int __init ep93xx_clock_init(void)
	446	{
	447	u32 value;
	448
	449	value = __raw_readl(EP93XX_SYSCON_CLOCK_SET1);
	450	if (!(value & 0x00800000)) { /* PLL1 bypassed? */
	451	clk_pll1.rate = clk_xtali.rate;
	452	} else {
	453	clk_pll1.rate = calc_pll_rate(value);
	454	}
	455	clk_f.rate = clk_pll1.rate / fclk_divisors[(value >> 25) & 0x7];
	456	clk_h.rate = clk_pll1.rate / hclk_divisors[(value >> 20) & 0x7];
	457	clk_p.rate = clk_h.rate / pclk_divisors[(value >> 18) & 0x3];
	458	ep93xx_dma_clock_init();
	459
	460	value = __raw_readl(EP93XX_SYSCON_CLOCK_SET2);
	461	if (!(value & 0x00080000)) { /* PLL2 bypassed? */
	462	clk_pll2.rate = clk_xtali.rate;
	463	} else if (value & 0x00040000) { /* PLL2 enabled? */
	464	clk_pll2.rate = calc_pll_rate(value);
	465	} else {
	466	clk_pll2.rate = 0;
	467	}
	468	clk_usb_host.rate = clk_pll2.rate / (((value >> 28) & 0xf) + 1);
	469
	470	printk(KERN_INFO "ep93xx: PLL1 running at %ld MHz, PLL2 at %ld MHz\n",
	471	clk_pll1.rate / 1000000, clk_pll2.rate / 1000000);
	472	printk(KERN_INFO "ep93xx: FCLK %ld MHz, HCLK %ld MHz, PCLK %ld MHz\n",
	473	clk_f.rate / 1000000, clk_h.rate / 1000000,
	474	clk_p.rate / 1000000);
	475
	476	clkdev_add_table(clocks, ARRAY_SIZE(clocks));
	477	return 0;
	478	}
	479	arch_initcall(ep93xx_clock_init);