[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/of_address.h>
#include <linux/io.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 at91_pmc *pmc;
};

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

struct at91rm9200_clk_usb {
	struct clk_hw hw;
	struct at91_pmc *pmc;
	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)
{
	u32 tmp;
	u8 usbdiv;
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;

	tmp = pmc_read(pmc, AT91_PMC_USB);
	usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;

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

static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
					  unsigned long *parent_rate)
{
	unsigned long div;

	if (!rate)
		return -EINVAL;

	if (rate >= *parent_rate)
		return *parent_rate;

	div = DIV_ROUND_CLOSEST(*parent_rate, rate);
	if (div > SAM9X5_USB_MAX_DIV + 1)
		div = SAM9X5_USB_MAX_DIV + 1;

	return DIV_ROUND_CLOSEST(*parent_rate, div);
}

static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
{
	u32 tmp;
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;

	if (index > 1)
		return -EINVAL;
	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
	if (index)
		tmp |= AT91_PMC_USBS;
	pmc_write(pmc, AT91_PMC_USB, tmp);
	return 0;
}

static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;

	return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
}

static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
				       unsigned long parent_rate)
{
	u32 tmp;
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;
	unsigned long div;

	if (!rate)
		return -EINVAL;

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

	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
	tmp |= (div - 1) << SAM9X5_USB_DIV_SHIFT;
	pmc_write(pmc, AT91_PMC_USB, tmp);

	return 0;
}

static const struct clk_ops at91sam9x5_usb_ops = {
	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
	.round_rate = at91sam9x5_clk_usb_round_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);
	struct at91_pmc *pmc = usb->pmc;

	pmc_write(pmc, AT91_PMC_USB,
		  pmc_read(pmc, AT91_PMC_USB) | 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);
	struct at91_pmc *pmc = usb->pmc;

	pmc_write(pmc, AT91_PMC_USB,
		  pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
}

static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
{
	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;

	return !!(pmc_read(pmc, AT91_PMC_USB) & 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,
	.round_rate = at91sam9x5_clk_usb_round_rate,
	.set_rate = at91sam9x5_clk_usb_set_rate,
};

static struct clk * __init
at91sam9x5_clk_register_usb(struct at91_pmc *pmc, 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;

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

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

	return clk;
}

static struct clk * __init
at91sam9n12_clk_register_usb(struct at91_pmc *pmc, 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;

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

	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);
	struct at91_pmc *pmc = usb->pmc;
	u32 tmp;
	u8 usbdiv;

	tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
	usbdiv = (tmp & 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 *parent = __clk_get_parent(hw->clk);
	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_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)
{
	u32 tmp;
	int i;
	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	struct at91_pmc *pmc = usb->pmc;
	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) {
			tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
			      ~AT91_PMC_USBDIV;
			tmp |= i << RM9200_USB_DIV_SHIFT;
			pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
			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 at91_pmc *pmc, 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->pmc = pmc;
	memcpy(usb->divisors, divisors, sizeof(usb->divisors));

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

	return clk;
}

void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
					struct at91_pmc *pmc)
{
	struct clk *clk;
	int i;
	int num_parents;
	const char *parent_names[USB_SOURCE_MAX];
	const char *name = np->name;

	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
	if (num_parents <= 0 || num_parents > USB_SOURCE_MAX)
		return;

	for (i = 0; i < num_parents; i++) {
		parent_names[i] = of_clk_get_parent_name(np, i);
		if (!parent_names[i])
			return;
	}

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

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

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}

void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
					 struct at91_pmc *pmc)
{
	struct clk *clk;
	const char *parent_name;
	const char *name = np->name;

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

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

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

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}

void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
					struct at91_pmc *pmc)
{
	struct clk *clk;
	const char *parent_name;
	const char *name = np->name;
	u32 divisors[4] = {0, 0, 0, 0};

	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);

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

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
}
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>
	15	#include <linux/of_address.h>
	16	#include <linux/io.h>
	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;
	30	struct at91_pmc *pmc;
	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;
	38	struct at91_pmc *pmc;
	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	{
	48	u32 tmp;
	49	u8 usbdiv;
	50	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	51	struct at91_pmc *pmc = usb->pmc;
	52
	53	tmp = pmc_read(pmc, AT91_PMC_USB);
	54	usbdiv = (tmp & AT91_PMC_OHCIUSBDIV) >> SAM9X5_USB_DIV_SHIFT;
69daf75a BB	55
69daf75a BB	56	return DIV_ROUND_CLOSEST(parent_rate, (usbdiv + 1));
c84a61d8 BB	57	}
	58
	59	static long at91sam9x5_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
	60	unsigned long *parent_rate)
	61	{
	62	unsigned long div;
69daf75a BB	63
	64	if (!rate)
	65	return -EINVAL;
c84a61d8 BB	66
	67	if (rate >= *parent_rate)
	68	return *parent_rate;
	69
69daf75a BB	70	div = DIV_ROUND_CLOSEST(*parent_rate, rate);
	71	if (div > SAM9X5_USB_MAX_DIV + 1)
	72	div = SAM9X5_USB_MAX_DIV + 1;
c84a61d8	73
69daf75a	74	return DIV_ROUND_CLOSEST(*parent_rate, div);
c84a61d8 BB	75	}
	76
	77	static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
	78	{
	79	u32 tmp;
	80	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	81	struct at91_pmc *pmc = usb->pmc;
	82
	83	if (index > 1)
	84	return -EINVAL;
	85	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
	86	if (index)
	87	tmp \|= AT91_PMC_USBS;
	88	pmc_write(pmc, AT91_PMC_USB, tmp);
	89	return 0;
	90	}
	91
	92	static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
	93	{
	94	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	95	struct at91_pmc *pmc = usb->pmc;
	96
	97	return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
	98	}
	99
	100	static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	101	unsigned long parent_rate)
	102	{
	103	u32 tmp;
	104	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	105	struct at91_pmc *pmc = usb->pmc;
69daf75a BB	106	unsigned long div;
	107
	108	if (!rate)
	109	return -EINVAL;
c84a61d8	110
69daf75a BB	111	div = DIV_ROUND_CLOSEST(parent_rate, rate);
69daf75a BB	112	if (div > SAM9X5_USB_MAX_DIV + 1 \|\| !div)
c84a61d8 BB	113	return -EINVAL;
	114
	115	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
	116	tmp \|= (div - 1) << SAM9X5_USB_DIV_SHIFT;
	117	pmc_write(pmc, AT91_PMC_USB, tmp);
	118
	119	return 0;
	120	}
	121
	122	static const struct clk_ops at91sam9x5_usb_ops = {
	123	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
	124	.round_rate = at91sam9x5_clk_usb_round_rate,
	125	.get_parent = at91sam9x5_clk_usb_get_parent,
	126	.set_parent = at91sam9x5_clk_usb_set_parent,
	127	.set_rate = at91sam9x5_clk_usb_set_rate,
	128	};
	129
	130	static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
	131	{
	132	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	133	struct at91_pmc *pmc = usb->pmc;
	134
	135	pmc_write(pmc, AT91_PMC_USB,
	136	pmc_read(pmc, AT91_PMC_USB) \| AT91_PMC_USBS);
	137	return 0;
	138	}
	139
	140	static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
	141	{
	142	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	143	struct at91_pmc *pmc = usb->pmc;
	144
	145	pmc_write(pmc, AT91_PMC_USB,
	146	pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
	147	}
	148
	149	static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
	150	{
	151	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	152	struct at91_pmc *pmc = usb->pmc;
	153
	154	return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);
	155	}
	156
	157	static const struct clk_ops at91sam9n12_usb_ops = {
	158	.enable = at91sam9n12_clk_usb_enable,
	159	.disable = at91sam9n12_clk_usb_disable,
	160	.is_enabled = at91sam9n12_clk_usb_is_enabled,
	161	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
	162	.round_rate = at91sam9x5_clk_usb_round_rate,
	163	.set_rate = at91sam9x5_clk_usb_set_rate,
	164	};
	165
	166	static struct clk * __init
	167	at91sam9x5_clk_register_usb(struct at91_pmc pmc, const char name,
	168	const char **parent_names, u8 num_parents)
	169	{
	170	struct at91sam9x5_clk_usb *usb;
	171	struct clk *clk = NULL;
	172	struct clk_init_data init;
	173
	174	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	175	if (!usb)
	176	return ERR_PTR(-ENOMEM);
177
178	init.name = name;
179	init.ops = &at91sam9x5_usb_ops;
180	init.parent_names = parent_names;
181	init.num_parents = num_parents;
182	init.flags = CLK_SET_RATE_GATE \| CLK_SET_PARENT_GATE;
183
184	usb->hw.init = &init;
185	usb->pmc = pmc;
186
187	clk = clk_register(NULL, &usb->hw);
188	if (IS_ERR(clk))
189	kfree(usb);
190
191	return clk;
192	}
193
194	static struct clk * __init
195	at91sam9n12_clk_register_usb(struct at91_pmc pmc, const char name,
196	const char *parent_name)
197	{
198	struct at91sam9x5_clk_usb *usb;
199	struct clk *clk = NULL;
200	struct clk_init_data init;
201
202	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
203	if (!usb)
204	return ERR_PTR(-ENOMEM);
205
206	init.name = name;
207	init.ops = &at91sam9n12_usb_ops;
208	init.parent_names = &parent_name;
209	init.num_parents = 1;
210	init.flags = CLK_SET_RATE_GATE;
211
212	usb->hw.init = &init;
213	usb->pmc = pmc;
214
215	clk = clk_register(NULL, &usb->hw);
216	if (IS_ERR(clk))
217	kfree(usb);
218
219	return clk;
220	}
221
222	static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
223	unsigned long parent_rate)
224	{
225	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
226	struct at91_pmc *pmc = usb->pmc;
227	u32 tmp;
228	u8 usbdiv;
229
230	tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
231	usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
232	if (usb->divisors[usbdiv])
233	return parent_rate / usb->divisors[usbdiv];
234
235	return 0;
236	}
237
238	static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
239	unsigned long *parent_rate)
240	{
241	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
13a6073d	242	struct clk *parent = __clk_get_parent(hw->clk);
c84a61d8 BB	243	unsigned long bestrate = 0;
	244	int bestdiff = -1;
	245	unsigned long tmprate;
	246	int tmpdiff;
	247	int i = 0;
	248
13a6073d BB	249	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	250	unsigned long tmp_parent_rate;
	251
c84a61d8 BB	252	if (!usb->divisors[i])
c84a61d8 BB	253	continue;
13a6073d BB	254
	255	tmp_parent_rate = rate * usb->divisors[i];
	256	tmp_parent_rate = __clk_round_rate(parent, tmp_parent_rate);
ff553ea1	257	tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
c84a61d8 BB	258	if (tmprate < rate)
	259	tmpdiff = rate - tmprate;
	260	else
	261	tmpdiff = tmprate - rate;
	262
	263	if (bestdiff < 0 \|\| bestdiff > tmpdiff) {
	264	bestrate = tmprate;
	265	bestdiff = tmpdiff;
13a6073d	266	*parent_rate = tmp_parent_rate;
c84a61d8 BB	267	}
	268
	269	if (!bestdiff)
	270	break;
	271	}
	272
	273	return bestrate;
	274	}
	275
	276	static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	277	unsigned long parent_rate)
	278	{
	279	u32 tmp;
	280	int i;
	281	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	282	struct at91_pmc *pmc = usb->pmc;
16eeaec7	283	unsigned long div;
c84a61d8	284
ff553ea1	285	if (!rate)
c84a61d8	286	return -EINVAL;
16eeaec7	287
ff553ea1	288	div = DIV_ROUND_CLOSEST(parent_rate, rate);
16eeaec7	289
c84a61d8 BB	290	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	291	if (usb->divisors[i] == div) {
	292	tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
	293	~AT91_PMC_USBDIV;
	294	tmp \|= i << RM9200_USB_DIV_SHIFT;
	295	pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
	296	return 0;
	297	}
	298	}
	299
	300	return -EINVAL;
	301	}
	302
	303	static const struct clk_ops at91rm9200_usb_ops = {
	304	.recalc_rate = at91rm9200_clk_usb_recalc_rate,
	305	.round_rate = at91rm9200_clk_usb_round_rate,
	306	.set_rate = at91rm9200_clk_usb_set_rate,
	307	};
	308
	309	static struct clk * __init
	310	at91rm9200_clk_register_usb(struct at91_pmc pmc, const char name,
	311	const char parent_name, const u32 divisors)
	312	{
	313	struct at91rm9200_clk_usb *usb;
	314	struct clk *clk = NULL;
	315	struct clk_init_data init;
	316
	317	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	318	if (!usb)
	319	return ERR_PTR(-ENOMEM);
	320
	321	init.name = name;
	322	init.ops = &at91rm9200_usb_ops;
	323	init.parent_names = &parent_name;
	324	init.num_parents = 1;
13a6073d	325	init.flags = CLK_SET_RATE_PARENT;
c84a61d8 BB	326
	327	usb->hw.init = &init;
	328	usb->pmc = pmc;
	329	memcpy(usb->divisors, divisors, sizeof(usb->divisors));
	330
	331	clk = clk_register(NULL, &usb->hw);
	332	if (IS_ERR(clk))
	333	kfree(usb);
	334
	335	return clk;
	336	}
	337
	338	void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
	339	struct at91_pmc *pmc)
	340	{
	341	struct clk *clk;
	342	int i;
	343	int num_parents;
	344	const char *parent_names[USB_SOURCE_MAX];
	345	const char *name = np->name;
	346
	347	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
	348	if (num_parents <= 0 \|\| num_parents > USB_SOURCE_MAX)
	349	return;
	350
	351	for (i = 0; i < num_parents; i++) {
	352	parent_names[i] = of_clk_get_parent_name(np, i);
	353	if (!parent_names[i])
	354	return;
	355	}
	356
	357	of_property_read_string(np, "clock-output-names", &name);
	358
	359	clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
	360	if (IS_ERR(clk))
	361	return;
	362
	363	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	364	}
	365
	366	void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
	367	struct at91_pmc *pmc)
	368	{
	369	struct clk *clk;
	370	const char *parent_name;
	371	const char *name = np->name;
	372
	373	parent_name = of_clk_get_parent_name(np, 0);
	374	if (!parent_name)
	375	return;
	376
	377	of_property_read_string(np, "clock-output-names", &name);
	378
	379	clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
	380	if (IS_ERR(clk))
	381	return;
	382
	383	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	384	}
	385
	386	void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
	387	struct at91_pmc *pmc)
	388	{
	389	struct clk *clk;
390	const char *parent_name;
391	const char *name = np->name;
392	u32 divisors[4] = {0, 0, 0, 0};
393
394	parent_name = of_clk_get_parent_name(np, 0);
395	if (!parent_name)
396	return;
397
398	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
399	if (!divisors[0])
400	return;
401
402	of_property_read_string(np, "clock-output-names", &name);
403
404	clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
405	if (IS_ERR(clk))
406	return;
407
408	of_clk_add_provider(np, of_clk_src_simple_get, clk);
409	}