[mirror_ubuntu-bionic-kernel.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_hw * __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_hw *hw;
	struct clk_init_data init;
	int ret;

	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;

	hw = &usb->hw;
	ret = clk_hw_register(NULL, &usb->hw);
	if (ret) {
		kfree(usb);
		hw = ERR_PTR(ret);
	}

	return hw;
}

static struct clk_hw * __init
at91sam9n12_clk_register_usb(struct regmap *regmap, const char *name,
			     const char *parent_name)
{
	struct at91sam9x5_clk_usb *usb;
	struct clk_hw *hw;
	struct clk_init_data init;
	int ret;

	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;

	hw = &usb->hw;
	ret = clk_hw_register(NULL, &usb->hw);
	if (ret) {
		kfree(usb);
		hw = ERR_PTR(ret);
	}

	return hw;
}

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_hw * __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_hw *hw;
	struct clk_init_data init;
	int ret;

	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));

	hw = &usb->hw;
	ret = clk_hw_register(NULL, &usb->hw);
	if (ret) {
		kfree(usb);
		hw = ERR_PTR(ret);
	}

	return hw;
}

static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np)
{
	struct clk_hw *hw;
	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;

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

	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
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_hw *hw;
	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;

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

	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
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_hw *hw;
	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;
	hw = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors);
	if (IS_ERR(hw))
		return;

	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
}
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
f5644f10	195	static struct clk_hw * __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;
f5644f10	200	struct clk_hw *hw;
c84a61d8	201	struct clk_init_data init;
f5644f10	202	int ret;
c84a61d8 BB	203
	204	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	205	if (!usb)
	206	return ERR_PTR(-ENOMEM);
	207
	208	init.name = name;
	209	init.ops = &at91sam9x5_usb_ops;
	210	init.parent_names = parent_names;
	211	init.num_parents = num_parents;
45912431 BB	212	init.flags = CLK_SET_RATE_GATE \| CLK_SET_PARENT_GATE \|
45912431 BB	213	CLK_SET_RATE_PARENT;
c84a61d8 BB	214
c84a61d8 BB	215	usb->hw.init = &init;
1bdf0232	216	usb->regmap = regmap;
c84a61d8	217
f5644f10 SB	218	hw = &usb->hw;
	219	ret = clk_hw_register(NULL, &usb->hw);
	220	if (ret) {
c84a61d8	221	kfree(usb);
f5644f10 SB	222	hw = ERR_PTR(ret);
f5644f10 SB	223	}
c84a61d8	224
f5644f10	225	return hw;
c84a61d8 BB	226	}
c84a61d8 BB	227
f5644f10	228	static struct clk_hw * __init
1bdf0232	229	at91sam9n12_clk_register_usb(struct regmap regmap, const char name,
c84a61d8 BB	230	const char *parent_name)
	231	{
	232	struct at91sam9x5_clk_usb *usb;
f5644f10	233	struct clk_hw *hw;
c84a61d8	234	struct clk_init_data init;
f5644f10	235	int ret;
c84a61d8 BB	236
	237	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	238	if (!usb)
	239	return ERR_PTR(-ENOMEM);
	240
	241	init.name = name;
	242	init.ops = &at91sam9n12_usb_ops;
	243	init.parent_names = &parent_name;
	244	init.num_parents = 1;
45912431	245	init.flags = CLK_SET_RATE_GATE \| CLK_SET_RATE_PARENT;
c84a61d8 BB	246
c84a61d8 BB	247	usb->hw.init = &init;
1bdf0232	248	usb->regmap = regmap;
c84a61d8	249
f5644f10 SB	250	hw = &usb->hw;
	251	ret = clk_hw_register(NULL, &usb->hw);
	252	if (ret) {
c84a61d8	253	kfree(usb);
f5644f10 SB	254	hw = ERR_PTR(ret);
f5644f10 SB	255	}
c84a61d8	256
f5644f10	257	return hw;
c84a61d8 BB	258	}
	259
	260	static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
	261	unsigned long parent_rate)
	262	{
	263	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
1bdf0232	264	unsigned int pllbr;
c84a61d8 BB	265	u8 usbdiv;
c84a61d8 BB	266
1bdf0232 BB	267	regmap_read(usb->regmap, AT91_CKGR_PLLBR, &pllbr);
	268
	269	usbdiv = (pllbr & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
c84a61d8 BB	270	if (usb->divisors[usbdiv])
	271	return parent_rate / usb->divisors[usbdiv];
	272
	273	return 0;
	274	}
	275
	276	static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
	277	unsigned long *parent_rate)
	278	{
	279	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
d0979335	280	struct clk_hw *parent = clk_hw_get_parent(hw);
c84a61d8 BB	281	unsigned long bestrate = 0;
	282	int bestdiff = -1;
	283	unsigned long tmprate;
	284	int tmpdiff;
	285	int i = 0;
	286
13a6073d BB	287	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	288	unsigned long tmp_parent_rate;
	289
c84a61d8 BB	290	if (!usb->divisors[i])
c84a61d8 BB	291	continue;
13a6073d BB	292
13a6073d BB	293	tmp_parent_rate = rate * usb->divisors[i];
d0979335	294	tmp_parent_rate = clk_hw_round_rate(parent, tmp_parent_rate);
ff553ea1	295	tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
c84a61d8 BB	296	if (tmprate < rate)
	297	tmpdiff = rate - tmprate;
	298	else
	299	tmpdiff = tmprate - rate;
	300
	301	if (bestdiff < 0 \|\| bestdiff > tmpdiff) {
	302	bestrate = tmprate;
	303	bestdiff = tmpdiff;
13a6073d	304	*parent_rate = tmp_parent_rate;
c84a61d8 BB	305	}
	306
	307	if (!bestdiff)
	308	break;
	309	}
	310
	311	return bestrate;
	312	}
	313
	314	static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	315	unsigned long parent_rate)
	316	{
c84a61d8 BB	317	int i;
c84a61d8 BB	318	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
16eeaec7	319	unsigned long div;
c84a61d8	320
ff553ea1	321	if (!rate)
c84a61d8	322	return -EINVAL;
16eeaec7	323
ff553ea1	324	div = DIV_ROUND_CLOSEST(parent_rate, rate);
16eeaec7	325
c84a61d8 BB	326	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
c84a61d8 BB	327	if (usb->divisors[i] == div) {
1bdf0232 BB	328	regmap_update_bits(usb->regmap, AT91_CKGR_PLLBR,
	329	AT91_PMC_USBDIV,
	330	i << RM9200_USB_DIV_SHIFT);
	331
c84a61d8 BB	332	return 0;
	333	}
	334	}
	335
	336	return -EINVAL;
	337	}
	338
	339	static const struct clk_ops at91rm9200_usb_ops = {
	340	.recalc_rate = at91rm9200_clk_usb_recalc_rate,
	341	.round_rate = at91rm9200_clk_usb_round_rate,
	342	.set_rate = at91rm9200_clk_usb_set_rate,
	343	};
	344
f5644f10	345	static struct clk_hw * __init
1bdf0232	346	at91rm9200_clk_register_usb(struct regmap regmap, const char name,
c84a61d8 BB	347	const char parent_name, const u32 divisors)
	348	{
	349	struct at91rm9200_clk_usb *usb;
f5644f10	350	struct clk_hw *hw;
c84a61d8	351	struct clk_init_data init;
f5644f10	352	int ret;
c84a61d8 BB	353
	354	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	355	if (!usb)
	356	return ERR_PTR(-ENOMEM);
	357
	358	init.name = name;
	359	init.ops = &at91rm9200_usb_ops;
	360	init.parent_names = &parent_name;
	361	init.num_parents = 1;
13a6073d	362	init.flags = CLK_SET_RATE_PARENT;
c84a61d8 BB	363
c84a61d8 BB	364	usb->hw.init = &init;
1bdf0232	365	usb->regmap = regmap;
c84a61d8 BB	366	memcpy(usb->divisors, divisors, sizeof(usb->divisors));
c84a61d8 BB	367
f5644f10 SB	368	hw = &usb->hw;
	369	ret = clk_hw_register(NULL, &usb->hw);
	370	if (ret) {
c84a61d8	371	kfree(usb);
f5644f10 SB	372	hw = ERR_PTR(ret);
f5644f10 SB	373	}
c84a61d8	374
f5644f10	375	return hw;
c84a61d8 BB	376	}
c84a61d8 BB	377
1bdf0232	378	static void __init of_at91sam9x5_clk_usb_setup(struct device_node *np)
c84a61d8	379	{
f5644f10	380	struct clk_hw *hw;
8c1b1e54	381	unsigned int num_parents;
c84a61d8 BB	382	const char *parent_names[USB_SOURCE_MAX];
c84a61d8 BB	383	const char *name = np->name;
1bdf0232	384	struct regmap *regmap;
c84a61d8	385
51a43be9	386	num_parents = of_clk_get_parent_count(np);
8c1b1e54	387	if (num_parents == 0 \|\| num_parents > USB_SOURCE_MAX)
c84a61d8 BB	388	return;
c84a61d8 BB	389
f0557fbe	390	of_clk_parent_fill(np, parent_names, num_parents);
c84a61d8 BB	391
	392	of_property_read_string(np, "clock-output-names", &name);
	393
1bdf0232 BB	394	regmap = syscon_node_to_regmap(of_get_parent(np));
	395	if (IS_ERR(regmap))
	396	return;
	397
f5644f10 SB	398	hw = at91sam9x5_clk_register_usb(regmap, name, parent_names,
	399	num_parents);
	400	if (IS_ERR(hw))
c84a61d8 BB	401	return;
c84a61d8 BB	402
f5644f10	403	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
c84a61d8	404	}
1bdf0232 BB	405	CLK_OF_DECLARE(at91sam9x5_clk_usb, "atmel,at91sam9x5-clk-usb",
1bdf0232 BB	406	of_at91sam9x5_clk_usb_setup);
c84a61d8	407
1bdf0232	408	static void __init of_at91sam9n12_clk_usb_setup(struct device_node *np)
c84a61d8	409	{
f5644f10	410	struct clk_hw *hw;
c84a61d8 BB	411	const char *parent_name;
c84a61d8 BB	412	const char *name = np->name;
1bdf0232	413	struct regmap *regmap;
c84a61d8 BB	414
	415	parent_name = of_clk_get_parent_name(np, 0);
	416	if (!parent_name)
	417	return;
	418
	419	of_property_read_string(np, "clock-output-names", &name);
	420
1bdf0232 BB	421	regmap = syscon_node_to_regmap(of_get_parent(np));
	422	if (IS_ERR(regmap))
	423	return;
	424
f5644f10 SB	425	hw = at91sam9n12_clk_register_usb(regmap, name, parent_name);
f5644f10 SB	426	if (IS_ERR(hw))
c84a61d8 BB	427	return;
c84a61d8 BB	428
f5644f10	429	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
c84a61d8	430	}
1bdf0232 BB	431	CLK_OF_DECLARE(at91sam9n12_clk_usb, "atmel,at91sam9n12-clk-usb",
1bdf0232 BB	432	of_at91sam9n12_clk_usb_setup);
c84a61d8	433
1bdf0232	434	static void __init of_at91rm9200_clk_usb_setup(struct device_node *np)
c84a61d8	435	{
f5644f10	436	struct clk_hw *hw;
c84a61d8 BB	437	const char *parent_name;
	438	const char *name = np->name;
	439	u32 divisors[4] = {0, 0, 0, 0};
1bdf0232	440	struct regmap *regmap;
c84a61d8 BB	441
	442	parent_name = of_clk_get_parent_name(np, 0);
	443	if (!parent_name)
	444	return;
	445
	446	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
	447	if (!divisors[0])
	448	return;
	449
	450	of_property_read_string(np, "clock-output-names", &name);
	451
1bdf0232 BB	452	regmap = syscon_node_to_regmap(of_get_parent(np));
	453	if (IS_ERR(regmap))
	454	return;
f5644f10 SB	455	hw = at91rm9200_clk_register_usb(regmap, name, parent_name, divisors);
f5644f10 SB	456	if (IS_ERR(hw))
c84a61d8 BB	457	return;
c84a61d8 BB	458
f5644f10	459	of_clk_add_hw_provider(np, of_clk_hw_simple_get, hw);
c84a61d8	460	}
1bdf0232 BB	461	CLK_OF_DECLARE(at91rm9200_clk_usb, "atmel,at91rm9200-clk-usb",
1bdf0232 BB	462	of_at91rm9200_clk_usb_setup);