[deliverable/linux.git] / drivers / clk / at91 / clk-usb.c

/*
 *  Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.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, or
 * (at your option) any later version.
 *
 */

#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>

#include "pmc.h"

#define USB_SOURCE_MAX		2

#define SAM9X5_USB_DIV_SHIFT	8
#define SAM9X5_USB_MAX_DIV	0xf

#define RM9200_USB_DIV_SHIFT	28
#define RM9200_USB_DIV_TAB_SIZE	4

struct at91sam9x5_clk_usb {
	struct clk_hw hw;
	struct regmap *regmap;
};

#define to_at91sam9x5_clk_usb(hw) \
	container_of(hw, struct at91sam9x5_clk_usb, hw)

struct at91rm9200_clk_usb {
	struct clk_hw hw;
	struct regmap *regmap;
	u32 divisors[4];
};

#define to_at91rm9200_clk_usb(hw) \
	container_of(hw, struct at91rm9200_clk_usb, hw)

static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
						    unsigned long parent_rate)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	unsigned int usbr;
	u8 usbdiv;

	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
	usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;

	return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
}

static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
					     struct clk_rate_request *req)
{
	struct clk_hw *parent;
	long best_rate = -EINVAL;
	unsigned long tmp_rate;
	int best_diff = -1;
	int tmp_diff;
	int i;

	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
		int div;

		parent = clk_hw_get_parent_by_index(hw, i);
		if (!parent)
			continue;

		for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
			unsigned long tmp_parent_rate;

			tmp_parent_rate = req->rate * div;
			tmp_parent_rate = clk_hw_round_rate(parent,
							   tmp_parent_rate);
			tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
			if (tmp_rate < req->rate)
				tmp_diff = req->rate - tmp_rate;
			else
				tmp_diff = tmp_rate - req->rate;

			if (best_diff < 0 || best_diff > tmp_diff) {
				best_rate = tmp_rate;
				best_diff = tmp_diff;
				req->best_parent_rate = tmp_parent_rate;
				req->best_parent_hw = parent;
			}

			if (!best_diff || tmp_rate < req->rate)
				break;
		}

		if (!best_diff)
			break;
	}

	if (best_rate < 0)
		return best_rate;

	req->rate = best_rate;
	return 0;
}

static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	if (index > 1)
		return -EINVAL;

	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
			   index ? AT91_PMC_USBS : 0);

	return 0;
}

static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	unsigned int usbr;

	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);

	return usbr & AT91_PMC_USBS;
}

static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
				       unsigned long parent_rate)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	unsigned long div;

	if (!rate)
		return -EINVAL;

	div = DIV_ROUND_CLOSEST(parent_rate, rate);
	if (div > SAM9X5_USB_MAX_DIV + 1 || !div)
		return -EINVAL;

	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
			   (div - 1) << SAM9X5_USB_DIV_SHIFT);

	return 0;
}

static const struct clk_ops at91sam9x5_usb_ops = {
	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
	.determine_rate = at91sam9x5_clk_usb_determine_rate,
	.get_parent = at91sam9x5_clk_usb_get_parent,
	.set_parent = at91sam9x5_clk_usb_set_parent,
	.set_rate = at91sam9x5_clk_usb_set_rate,
};

static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
			   AT91_PMC_USBS);

	return 0;
}

static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);

	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
}

static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	unsigned int usbr;

	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);

	return usbr & AT91_PMC_USBS;
}

static const struct clk_ops at91sam9n12_usb_ops = {
	.enable = at91sam9n12_clk_usb_enable,
	.disable = at91sam9n12_clk_usb_disable,
	.is_enabled = at91sam9n12_clk_usb_is_enabled,
	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
	.determine_rate = at91sam9x5_clk_usb_determine_rate,
	.set_rate = at91sam9x5_clk_usb_set_rate,
};

static struct clk * __init
at91sam9x5_clk_register_usb(struct regmap *regmap, const char *name,
			    const char **parent_names, u8 num_parents)
{
	struct at91sam9x5_clk_usb *usb;
	struct clk *clk = NULL;
	struct clk_init_data init;

	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	if (!usb)
		return ERR_PTR(-ENOMEM);

	init.name = name;
	init.ops = &at91sam9x5_usb_ops;
	init.parent_names = parent_names;
	init.num_parents = num_parents;
	init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE |
		     CLK_SET_RATE_PARENT;

	usb->hw.init = &init;
	usb->regmap = regmap;

	clk = clk_register(NULL, &usb->hw);
	if (IS_ERR(clk))
		kfree(usb);

	return clk;
}

static struct clk * __init
at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
			     const char *parent_name)
{
	struct at91sam9x5_clk_usb *usb;
	struct clk *clk = NULL;
	struct clk_init_data init;

	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	if (!usb)
		return ERR_PTR(-ENOMEM);

	init.name = name;
	init.ops = &at91sam9n12_usb_ops;
	init.parent_names = &parent_name;
	init.num_parents = 1;
	init.flags = CLK_SET_RATE_GATE | CLK_SET_RATE_PARENT;

	usb->hw.init = &init;
	usb->regmap = regmap;

	clk = clk_register(NULL, &usb->hw);
	if (IS_ERR(clk))
		kfree(usb);

	return clk;
}

static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
						    unsigned long parent_rate)
{
	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	unsigned int pllbr;
	u8 usbdiv;

	regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);

	usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
	if (usb->divisors[usbdiv])
		return parent_rate / usb->divisors[usbdiv];

	return 0;
}

static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
					  unsigned long *parent_rate)
{
	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	struct clk_hw *parent = clk_hw_get_parent(hw);
	unsigned long bestrate = 0;
	int bestdiff = -1;
	unsigned long tmprate;
	int tmpdiff;
	int i = 0;

	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
		unsigned long tmp_parent_rate;

		if (!usb->divisors[i])
			continue;

		tmp_parent_rate = rate * usb->divisors[i];
		tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
		tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
		if (tmprate < rate)
			tmpdiff = rate - tmprate;
		else
			tmpdiff = tmprate - rate;

		if (bestdiff < 0 || bestdiff > tmpdiff) {
			bestrate = tmprate;
			bestdiff = tmpdiff;
			*parent_rate = tmp_parent_rate;
		}

		if (!bestdiff)
			break;
	}

	return bestrate;
}

static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
				       unsigned long parent_rate)
{
	int i;
	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	unsigned long div;

	if (!rate)
		return -EINVAL;

	div = DIV_ROUND_CLOSEST(parent_rate, rate);

	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
		if (usb->divisors[i] == div) {
			regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
					   AT91_PMC_USBDIV,
					   i << RM9200_USB_DIV_SHIFT);

			return 0;
		}
	}

	return -EINVAL;
}

static const struct clk_ops at91rm9200_usb_ops = {
	.recalc_rate = at91rm9200_clk_usb_recalc_rate,
	.round_rate = at91rm9200_clk_usb_round_rate,
	.set_rate = at91rm9200_clk_usb_set_rate,
};

static struct clk * __init
at91rm9200_clk_register_usb(struct regmap *regmap, const char *name,
			    const char *parent_name, const u32 *divisors)
{
	struct at91rm9200_clk_usb *usb;
	struct clk *clk = NULL;
	struct clk_init_data init;

	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	if (!usb)
		return ERR_PTR(-ENOMEM);

	init.name = name;
	init.ops = &at91rm9200_usb_ops;
	init.parent_names = &parent_name;
	init.num_parents = 1;
	init.flags = CLK_SET_RATE_PARENT;

	usb->hw.init = &init;
	usb->regmap = regmap;
	memcpy(usb->divisors, divisors, sizeof(usb->divisors));

	clk = clk_register(NULL, &usb->hw);
	if (IS_ERR(clk))
		kfree(usb);

	return clk;
}

static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np)
{
	struct clk *clk;
	unsigned int num_parents;
	const char *parent_names[USB_SOURCE_MAX];
	const char *name = np->name;
	struct regmap *regmap;

	num_parents = of_clk_get_parent_count(np);
	if (num_parents == 0 || num_parents > USB_SOURCE_MAX)
		return;

	of_clk_parent_fill(np, parent_names, num_parents);

	of_property_read_string(np, "clock-output-names", &name);

	regmap = syscon_node_to_regmap(of_get_parent(np));
	if (IS_ERR(regmap))
		return;

	clk = at91sam9x5_clk_register_usb(regmap, name, parent_names,
					  num_parents);
	if (IS_ERR(clk))
		return;

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
CLK_OF_DECLARE(at91sam9x5_clk_usb, "atmel,at91sam9x5-clk-usb",
	       of_at91sam9x5_clk_usb_setup);

static void __init of_at91sam9n12_clk_usb_setup(struct device_node *np)
{
	struct clk *clk;
	const char *parent_name;
	const char *name = np->name;
	struct regmap *regmap;

	parent_name = of_clk_get_parent_name(np, 0);
	if (!parent_name)
		return;

	of_property_read_string(np, "clock-output-names", &name);

	regmap = syscon_node_to_regmap(of_get_parent(np));
	if (IS_ERR(regmap))
		return;

	clk = at91sam9n12_clk_register_usb(regmap, name, parent_name);
	if (IS_ERR(clk))
		return;

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
CLK_OF_DECLARE(at91sam9n12_clk_usb, "atmel,at91sam9n12-clk-usb",
	       of_at91sam9n12_clk_usb_setup);

static void __init of_at91rm9200_clk_usb_setup(struct device_node *np)
{
	struct clk *clk;
	const char *parent_name;
	const char *name = np->name;
	u32 divisors[4] = {0, 0, 0, 0};
	struct regmap *regmap;

	parent_name = of_clk_get_parent_name(np, 0);
	if (!parent_name)
		return;

	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
	if (!divisors[0])
		return;

	of_property_read_string(np, "clock-output-names", &name);

	regmap = syscon_node_to_regmap(of_get_parent(np));
	if (IS_ERR(regmap))
		return;

	clk = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors);
	if (IS_ERR(clk))
		return;

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
CLK_OF_DECLARE(at91rm9200_clk_usb, "atmel,at91rm9200-clk-usb",
	       of_at91rm9200_clk_usb_setup);
Commit	Line	Data
c84a61d8 BB	1	/*
	2	* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	*/
	10
	11	#include <linux/clk-provider.h>
	12	#include <linux/clkdev.h>
	13	#include <linux/clk/at91_pmc.h>
	14	#include <linux/of.h>
1bdf0232 BB	15	#include <linux/mfd/syscon.h>
1bdf0232 BB	16	#include <linux/regmap.h>
c84a61d8 BB	17
	18	#include "pmc.h"
	19
	20	#define USB_SOURCE_MAX 2
	21
	22	#define SAM9X5_USB_DIV_SHIFT 8
	23	#define SAM9X5_USB_MAX_DIV 0xf
	24
	25	#define RM9200_USB_DIV_SHIFT 28
	26	#define RM9200_USB_DIV_TAB_SIZE 4
	27
	28	struct at91sam9x5_clk_usb {
	29	struct clk_hw hw;
1bdf0232	30	struct regmap *regmap;
c84a61d8 BB	31	};
	32
	33	#define to_at91sam9x5_clk_usb(hw) \
	34	container_of(hw, struct at91sam9x5_clk_usb, hw)
	35
	36	struct at91rm9200_clk_usb {
	37	struct clk_hw hw;
1bdf0232	38	struct regmap *regmap;
c84a61d8 BB	39	u32 divisors[4];
	40	};
	41
	42	#define to_at91rm9200_clk_usb(hw) \
	43	container_of(hw, struct at91rm9200_clk_usb, hw)
	44
	45	static unsigned long at91sam9x5_clk_usb_recalc_rate(struct clk_hw *hw,
	46	unsigned long parent_rate)
	47	{
c84a61d8	48	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
1bdf0232 BB	49	unsigned int usbr;
1bdf0232 BB	50	u8 usbdiv;
c84a61d8	51
1bdf0232 BB	52	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
1bdf0232 BB	53	usbdiv = (usbr & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
69daf75a BB	54
69daf75a BB	55	return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
c84a61d8 BB	56	}
c84a61d8 BB	57
0817b62c BB	58	static int at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
0817b62c BB	59	struct clk_rate_request *req)
c84a61d8	60	{
d0979335	61	struct clk_hw *parent;
45912431 BB	62	long best_rate = -EINVAL;
	63	unsigned long tmp_rate;
	64	int best_diff = -1;
	65	int tmp_diff;
	66	int i;
	67
497295af	68	for (i = 0; i < clk_hw_get_num_parents(hw); i++) {
45912431 BB	69	int div;
45912431 BB	70
d0979335	71	parent = clk_hw_get_parent_by_index(hw, i);
45912431 BB	72	if (!parent)
	73	continue;
	74
	75	for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
	76	unsigned long tmp_parent_rate;
	77
0817b62c	78	tmp_parent_rate = req->rate * div;
d0979335	79	tmp_parent_rate = clk_hw_round_rate(parent,
45912431 BB	80	tmp_parent_rate);
45912431 BB	81	tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
0817b62c BB	82	if (tmp_rate < req->rate)
0817b62c BB	83	tmp_diff = req->rate - tmp_rate;
45912431	84	else
0817b62c	85	tmp_diff = tmp_rate - req->rate;
45912431 BB	86
	87	if (best_diff < 0 \|\| best_diff > tmp_diff) {
	88	best_rate = tmp_rate;
	89	best_diff = tmp_diff;
0817b62c	90	req->best_parent_rate = tmp_parent_rate;
d0979335	91	req->best_parent_hw = parent;
45912431 BB	92	}
45912431 BB	93
0817b62c	94	if (!best_diff \|\| tmp_rate < req->rate)
45912431 BB	95	break;
	96	}
	97
	98	if (!best_diff)
	99	break;
	100	}
	101
0817b62c BB	102	if (best_rate < 0)
	103	return best_rate;
	104
	105	req->rate = best_rate;
	106	return 0;
c84a61d8 BB	107	}
	108
	109	static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
	110	{
c84a61d8	111	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
c84a61d8 BB	112
	113	if (index > 1)
	114	return -EINVAL;
1bdf0232 BB	115
	116	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
	117	index ? AT91_PMC_USBS : 0);
	118
c84a61d8 BB	119	return 0;
	120	}
	121
	122	static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
	123	{
	124	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
1bdf0232	125	unsigned int usbr;
c84a61d8	126
1bdf0232 BB	127	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
	128
	129	return usbr & AT91_PMC_USBS;
c84a61d8 BB	130	}
	131
	132	static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	133	unsigned long parent_rate)
	134	{
c84a61d8	135	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
69daf75a BB	136	unsigned long div;
	137
	138	if (!rate)
	139	return -EINVAL;
c84a61d8	140
69daf75a BB	141	div = DIV_ROUND_CLOSEST(parent_rate, rate);
69daf75a BB	142	if (div > SAM9X5_USB_MAX_DIV + 1 \|\| !div)
c84a61d8 BB	143	return -EINVAL;
c84a61d8 BB	144
1bdf0232 BB	145	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_OHCIUSBDIV,
1bdf0232 BB	146	(div - 1) << SAM9X5_USB_DIV_SHIFT);
c84a61d8 BB	147
	148	return 0;
	149	}
	150
	151	static const struct clk_ops at91sam9x5_usb_ops = {
	152	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
45912431	153	.determine_rate = at91sam9x5_clk_usb_determine_rate,
c84a61d8 BB	154	.get_parent = at91sam9x5_clk_usb_get_parent,
	155	.set_parent = at91sam9x5_clk_usb_set_parent,
	156	.set_rate = at91sam9x5_clk_usb_set_rate,
	157	};
	158
	159	static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
	160	{
	161	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
c84a61d8	162
1bdf0232 BB	163	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS,
	164	AT91_PMC_USBS);
	165
c84a61d8 BB	166	return 0;
	167	}
	168
	169	static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
	170	{
	171	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
c84a61d8	172
1bdf0232	173	regmap_update_bits(usb->regmap, AT91_PMC_USB, AT91_PMC_USBS, 0);
c84a61d8 BB	174	}
	175
	176	static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
	177	{
	178	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
1bdf0232	179	unsigned int usbr;
c84a61d8	180
1bdf0232 BB	181	regmap_read(usb->regmap, AT91_PMC_USB, &usbr);
	182
	183	return usbr & AT91_PMC_USBS;
c84a61d8 BB	184	}
	185
	186	static const struct clk_ops at91sam9n12_usb_ops = {
	187	.enable = at91sam9n12_clk_usb_enable,
	188	.disable = at91sam9n12_clk_usb_disable,
	189	.is_enabled = at91sam9n12_clk_usb_is_enabled,
	190	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
45912431	191	.determine_rate = at91sam9x5_clk_usb_determine_rate,
c84a61d8 BB	192	.set_rate = at91sam9x5_clk_usb_set_rate,
	193	};
	194
	195	static struct clk * __init
1bdf0232	196	at91sam9x5_clk_register_usb(struct regmap regmap, const char name,
c84a61d8 BB	197	const char **parent_names, u8 num_parents)
	198	{
	199	struct at91sam9x5_clk_usb *usb;
	200	struct clk *clk = NULL;
	201	struct clk_init_data init;
	202
	203	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	204	if (!usb)
	205	return ERR_PTR(-ENOMEM);
	206
	207	init.name = name;
	208	init.ops = &at91sam9x5_usb_ops;
	209	init.parent_names = parent_names;
	210	init.num_parents = num_parents;
45912431 BB	211	init.flags = CLK_SET_RATE_GATE \| CLK_SET_PARENT_GATE \|
45912431 BB	212	CLK_SET_RATE_PARENT;
c84a61d8 BB	213
c84a61d8 BB	214	usb->hw.init = &init;
1bdf0232	215	usb->regmap = regmap;
c84a61d8 BB	216
	217	clk = clk_register(NULL, &usb->hw);
	218	if (IS_ERR(clk))
	219	kfree(usb);
	220
	221	return clk;
	222	}
	223
	224	static struct clk * __init
1bdf0232	225	at91sam9n12_clk_register_usb(struct regmap regmap, const char name,
c84a61d8 BB	226	const char *parent_name)
	227	{
	228	struct at91sam9x5_clk_usb *usb;
	229	struct clk *clk = NULL;
	230	struct clk_init_data init;
	231
	232	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	233	if (!usb)
	234	return ERR_PTR(-ENOMEM);
	235
	236	init.name = name;
	237	init.ops = &at91sam9n12_usb_ops;
	238	init.parent_names = &parent_name;
	239	init.num_parents = 1;
45912431	240	init.flags = CLK_SET_RATE_GATE \| CLK_SET_RATE_PARENT;
c84a61d8 BB	241
c84a61d8 BB	242	usb->hw.init = &init;
1bdf0232	243	usb->regmap = regmap;
c84a61d8 BB	244
	245	clk = clk_register(NULL, &usb->hw);
	246	if (IS_ERR(clk))
	247	kfree(usb);
	248
	249	return clk;
	250	}
	251
	252	static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
	253	unsigned long parent_rate)
	254	{
	255	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
1bdf0232	256	unsigned int pllbr;
c84a61d8 BB	257	u8 usbdiv;
c84a61d8 BB	258
1bdf0232 BB	259	regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
	260
	261	usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
c84a61d8 BB	262	if (usb->divisors[usbdiv])
	263	return parent_rate / usb->divisors[usbdiv];
	264
	265	return 0;
	266	}
	267
	268	static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
	269	unsigned long *parent_rate)
	270	{
	271	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
d0979335	272	struct clk_hw *parent = clk_hw_get_parent(hw);
c84a61d8 BB	273	unsigned long bestrate = 0;
	274	int bestdiff = -1;
	275	unsigned long tmprate;
	276	int tmpdiff;
	277	int i = 0;
	278
13a6073d BB	279	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	280	unsigned long tmp_parent_rate;
	281
c84a61d8 BB	282	if (!usb->divisors[i])
c84a61d8 BB	283	continue;
13a6073d BB	284
13a6073d BB	285	tmp_parent_rate = rate * usb->divisors[i];
d0979335	286	tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
ff553ea1	287	tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
c84a61d8 BB	288	if (tmprate < rate)
	289	tmpdiff = rate - tmprate;
	290	else
	291	tmpdiff = tmprate - rate;
	292
	293	if (bestdiff < 0 \|\| bestdiff > tmpdiff) {
	294	bestrate = tmprate;
	295	bestdiff = tmpdiff;
13a6073d	296	*parent_rate = tmp_parent_rate;
c84a61d8 BB	297	}
	298
	299	if (!bestdiff)
	300	break;
	301	}
	302
	303	return bestrate;
	304	}
	305
	306	static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	307	unsigned long parent_rate)
	308	{
c84a61d8 BB	309	int i;
c84a61d8 BB	310	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
16eeaec7	311	unsigned long div;
c84a61d8	312
ff553ea1	313	if (!rate)
c84a61d8	314	return -EINVAL;
16eeaec7	315
ff553ea1	316	div = DIV_ROUND_CLOSEST(parent_rate, rate);
16eeaec7	317
c84a61d8 BB	318	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
c84a61d8 BB	319	if (usb->divisors[i] == div) {
1bdf0232 BB	320	regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
	321	AT91_PMC_USBDIV,
	322	i << RM9200_USB_DIV_SHIFT);
	323
c84a61d8 BB	324	return 0;
	325	}
	326	}
	327
	328	return -EINVAL;
	329	}
	330
	331	static const struct clk_ops at91rm9200_usb_ops = {
	332	.recalc_rate = at91rm9200_clk_usb_recalc_rate,
	333	.round_rate = at91rm9200_clk_usb_round_rate,
	334	.set_rate = at91rm9200_clk_usb_set_rate,
	335	};
	336
	337	static struct clk * __init
1bdf0232	338	at91rm9200_clk_register_usb(struct regmap regmap, const char name,
c84a61d8 BB	339	const char parent_name, const u32 divisors)
	340	{
	341	struct at91rm9200_clk_usb *usb;
	342	struct clk *clk = NULL;
	343	struct clk_init_data init;
	344
	345	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	346	if (!usb)
	347	return ERR_PTR(-ENOMEM);
	348
	349	init.name = name;
	350	init.ops = &at91rm9200_usb_ops;
	351	init.parent_names = &parent_name;
	352	init.num_parents = 1;
13a6073d	353	init.flags = CLK_SET_RATE_PARENT;
c84a61d8 BB	354
c84a61d8 BB	355	usb->hw.init = &init;
1bdf0232	356	usb->regmap = regmap;
c84a61d8 BB	357	memcpy(usb->divisors, divisors, sizeof(usb->divisors));
	358
	359	clk = clk_register(NULL, &usb->hw);
	360	if (IS_ERR(clk))
	361	kfree(usb);
	362
	363	return clk;
	364	}
	365
1bdf0232	366	static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np)
c84a61d8 BB	367	{
c84a61d8 BB	368	struct clk *clk;
8c1b1e54	369	unsigned int num_parents;
c84a61d8 BB	370	const char *parent_names[USB_SOURCE_MAX];
c84a61d8 BB	371	const char *name = np->name;
1bdf0232	372	struct regmap *regmap;
c84a61d8	373
51a43be9	374	num_parents = of_clk_get_parent_count(np);
8c1b1e54	375	if (num_parents == 0 \|\| num_parents > USB_SOURCE_MAX)
c84a61d8 BB	376	return;
c84a61d8 BB	377
f0557fbe	378	of_clk_parent_fill(np, parent_names, num_parents);
c84a61d8 BB	379
	380	of_property_read_string(np, "clock-output-names", &name);
	381
1bdf0232 BB	382	regmap = syscon_node_to_regmap(of_get_parent(np));
	383	if (IS_ERR(regmap))
	384	return;
	385
	386	clk = at91sam9x5_clk_register_usb(regmap, name, parent_names,
	387	num_parents);
c84a61d8 BB	388	if (IS_ERR(clk))
	389	return;
	390
	391	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	392	}
1bdf0232 BB	393	CLK_OF_DECLARE(at91sam9x5_clk_usb, "atmel,at91sam9x5-clk-usb",
1bdf0232 BB	394	of_at91sam9x5_clk_usb_setup);
c84a61d8	395
1bdf0232	396	static void __init of_at91sam9n12_clk_usb_setup(struct device_node *np)
c84a61d8 BB	397	{
	398	struct clk *clk;
	399	const char *parent_name;
	400	const char *name = np->name;
1bdf0232	401	struct regmap *regmap;
c84a61d8 BB	402
	403	parent_name = of_clk_get_parent_name(np, 0);
	404	if (!parent_name)
	405	return;
	406
	407	of_property_read_string(np, "clock-output-names", &name);
	408
1bdf0232 BB	409	regmap = syscon_node_to_regmap(of_get_parent(np));
	410	if (IS_ERR(regmap))
	411	return;
	412
	413	clk = at91sam9n12_clk_register_usb(regmap, name, parent_name);
c84a61d8 BB	414	if (IS_ERR(clk))
	415	return;
	416
	417	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	418	}
1bdf0232 BB	419	CLK_OF_DECLARE(at91sam9n12_clk_usb, "atmel,at91sam9n12-clk-usb",
1bdf0232 BB	420	of_at91sam9n12_clk_usb_setup);
c84a61d8	421
1bdf0232	422	static void __init of_at91rm9200_clk_usb_setup(struct device_node *np)
c84a61d8 BB	423	{
	424	struct clk *clk;
	425	const char *parent_name;
	426	const char *name = np->name;
	427	u32 divisors[4] = {0, 0, 0, 0};
1bdf0232	428	struct regmap *regmap;
c84a61d8 BB	429
	430	parent_name = of_clk_get_parent_name(np, 0);
	431	if (!parent_name)
	432	return;
	433
	434	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
	435	if (!divisors[0])
	436	return;
	437
	438	of_property_read_string(np, "clock-output-names", &name);
	439
1bdf0232 BB	440	regmap = syscon_node_to_regmap(of_get_parent(np));
	441	if (IS_ERR(regmap))
	442	return;
	443
	444	clk = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors);
c84a61d8 BB	445	if (IS_ERR(clk))
	446	return;
	447
	448	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	449	}
1bdf0232 BB	450	CLK_OF_DECLARE(at91rm9200_clk_usb, "atmel,at91rm9200-clk-usb",
1bdf0232 BB	451	of_at91rm9200_clk_usb_setup);