[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_determine_rate(struct clk_hw *hw,
					      unsigned long rate,
					      unsigned long min_rate,
					      unsigned long max_rate,
					      unsigned long *best_parent_rate,
					      struct clk_hw **best_parent_hw)
{
	struct clk *parent = NULL;
	long best_rate = -EINVAL;
	unsigned long tmp_rate;
	int best_diff = -1;
	int tmp_diff;
	int i;

	for (i = 0; i < __clk_get_num_parents(hw->clk); i++) {
		int div;

		parent = clk_get_parent_by_index(hw->clk, i);
		if (!parent)
			continue;

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

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

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

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

		if (!best_diff)
			break;
	}

	return best_rate;
}

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,
	.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);
	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,
	.determine_rate = at91sam9x5_clk_usb_determine_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 |
		     CLK_SET_RATE_PARENT;

	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 | CLK_SET_RATE_PARENT;

	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	}
c84a61d8 BB	58
45912431 BB	59	static long at91sam9x5_clk_usb_determine_rate(struct clk_hw *hw,
	60	unsigned long rate,
	61	unsigned long min_rate,
	62	unsigned long max_rate,
	63	unsigned long *best_parent_rate,
	64	struct clk_hw **best_parent_hw)
c84a61d8	65	{
45912431 BB	66	struct clk *parent = NULL;
	67	long best_rate = -EINVAL;
	68	unsigned long tmp_rate;
	69	int best_diff = -1;
	70	int tmp_diff;
	71	int i;
	72
	73	for (i = 0; i < __clk_get_num_parents(hw->clk); i++) {
	74	int div;
	75
	76	parent = clk_get_parent_by_index(hw->clk, i);
	77	if (!parent)
	78	continue;
	79
	80	for (div = 1; div < SAM9X5_USB_MAX_DIV + 2; div++) {
	81	unsigned long tmp_parent_rate;
	82
	83	tmp_parent_rate = rate * div;
	84	tmp_parent_rate = __clk_round_rate(parent,
	85	tmp_parent_rate);
	86	tmp_rate = DIV_ROUND_CLOSEST(tmp_parent_rate, div);
	87	if (tmp_rate < rate)
	88	tmp_diff = rate - tmp_rate;
	89	else
	90	tmp_diff = tmp_rate - rate;
	91
	92	if (best_diff < 0 \|\| best_diff > tmp_diff) {
	93	best_rate = tmp_rate;
	94	best_diff = tmp_diff;
	95	*best_parent_rate = tmp_parent_rate;
	96	*best_parent_hw = __clk_get_hw(parent);
	97	}
	98
	99	if (!best_diff \|\| tmp_rate < rate)
	100	break;
	101	}
	102
	103	if (!best_diff)
	104	break;
	105	}
	106
	107	return best_rate;
c84a61d8 BB	108	}
	109
	110	static int at91sam9x5_clk_usb_set_parent(struct clk_hw *hw, u8 index)
	111	{
	112	u32 tmp;
	113	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	114	struct at91_pmc *pmc = usb->pmc;
	115
	116	if (index > 1)
	117	return -EINVAL;
	118	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS;
	119	if (index)
	120	tmp \|= AT91_PMC_USBS;
	121	pmc_write(pmc, AT91_PMC_USB, tmp);
	122	return 0;
	123	}
	124
	125	static u8 at91sam9x5_clk_usb_get_parent(struct clk_hw *hw)
	126	{
	127	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	128	struct at91_pmc *pmc = usb->pmc;
	129
	130	return pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS;
	131	}
	132
	133	static int at91sam9x5_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	134	unsigned long parent_rate)
	135	{
	136	u32 tmp;
	137	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	138	struct at91_pmc *pmc = usb->pmc;
69daf75a BB	139	unsigned long div;
	140
	141	if (!rate)
	142	return -EINVAL;
c84a61d8	143
69daf75a BB	144	div = DIV_ROUND_CLOSEST(parent_rate, rate);
69daf75a BB	145	if (div > SAM9X5_USB_MAX_DIV + 1 \|\| !div)
c84a61d8 BB	146	return -EINVAL;
	147
	148	tmp = pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_OHCIUSBDIV;
	149	tmp \|= (div - 1) << SAM9X5_USB_DIV_SHIFT;
	150	pmc_write(pmc, AT91_PMC_USB, tmp);
	151
	152	return 0;
	153	}
	154
	155	static const struct clk_ops at91sam9x5_usb_ops = {
	156	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
45912431	157	.determine_rate = at91sam9x5_clk_usb_determine_rate,
c84a61d8 BB	158	.get_parent = at91sam9x5_clk_usb_get_parent,
	159	.set_parent = at91sam9x5_clk_usb_set_parent,
	160	.set_rate = at91sam9x5_clk_usb_set_rate,
	161	};
	162
	163	static int at91sam9n12_clk_usb_enable(struct clk_hw *hw)
	164	{
	165	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	166	struct at91_pmc *pmc = usb->pmc;
	167
	168	pmc_write(pmc, AT91_PMC_USB,
	169	pmc_read(pmc, AT91_PMC_USB) \| AT91_PMC_USBS);
	170	return 0;
	171	}
	172
	173	static void at91sam9n12_clk_usb_disable(struct clk_hw *hw)
	174	{
	175	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	176	struct at91_pmc *pmc = usb->pmc;
	177
	178	pmc_write(pmc, AT91_PMC_USB,
	179	pmc_read(pmc, AT91_PMC_USB) & ~AT91_PMC_USBS);
	180	}
	181
	182	static int at91sam9n12_clk_usb_is_enabled(struct clk_hw *hw)
	183	{
	184	struct at91sam9x5_clk_usb *usb = to_at91sam9x5_clk_usb(hw);
	185	struct at91_pmc *pmc = usb->pmc;
	186
	187	return !!(pmc_read(pmc, AT91_PMC_USB) & AT91_PMC_USBS);
	188	}
	189
	190	static const struct clk_ops at91sam9n12_usb_ops = {
	191	.enable = at91sam9n12_clk_usb_enable,
	192	.disable = at91sam9n12_clk_usb_disable,
	193	.is_enabled = at91sam9n12_clk_usb_is_enabled,
	194	.recalc_rate = at91sam9x5_clk_usb_recalc_rate,
45912431	195	.determine_rate = at91sam9x5_clk_usb_determine_rate,
c84a61d8 BB	196	.set_rate = at91sam9x5_clk_usb_set_rate,
	197	};
	198
	199	static struct clk * __init
	200	at91sam9x5_clk_register_usb(struct at91_pmc pmc, const char name,
	201	const char **parent_names, u8 num_parents)
	202	{
	203	struct at91sam9x5_clk_usb *usb;
	204	struct clk *clk = NULL;
	205	struct clk_init_data init;
	206
	207	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	208	if (!usb)
	209	return ERR_PTR(-ENOMEM);
	210
	211	init.name = name;
	212	init.ops = &at91sam9x5_usb_ops;
	213	init.parent_names = parent_names;
	214	init.num_parents = num_parents;
45912431 BB	215	init.flags = CLK_SET_RATE_GATE \| CLK_SET_PARENT_GATE \|
45912431 BB	216	CLK_SET_RATE_PARENT;
c84a61d8 BB	217
	218	usb->hw.init = &init;
	219	usb->pmc = pmc;
	220
	221	clk = clk_register(NULL, &usb->hw);
	222	if (IS_ERR(clk))
	223	kfree(usb);
	224
	225	return clk;
	226	}
	227
	228	static struct clk * __init
	229	at91sam9n12_clk_register_usb(struct at91_pmc pmc, const char name,
	230	const char *parent_name)
	231	{
	232	struct at91sam9x5_clk_usb *usb;
	233	struct clk *clk = NULL;
	234	struct clk_init_data init;
	235
	236	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	237	if (!usb)
	238	return ERR_PTR(-ENOMEM);
	239
	240	init.name = name;
	241	init.ops = &at91sam9n12_usb_ops;
	242	init.parent_names = &parent_name;
	243	init.num_parents = 1;
45912431	244	init.flags = CLK_SET_RATE_GATE \| CLK_SET_RATE_PARENT;
c84a61d8 BB	245
	246	usb->hw.init = &init;
	247	usb->pmc = pmc;
	248
	249	clk = clk_register(NULL, &usb->hw);
	250	if (IS_ERR(clk))
	251	kfree(usb);
	252
	253	return clk;
	254	}
	255
	256	static unsigned long at91rm9200_clk_usb_recalc_rate(struct clk_hw *hw,
	257	unsigned long parent_rate)
	258	{
	259	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	260	struct at91_pmc *pmc = usb->pmc;
	261	u32 tmp;
	262	u8 usbdiv;
	263
	264	tmp = pmc_read(pmc, AT91_CKGR_PLLBR);
	265	usbdiv = (tmp & AT91_PMC_USBDIV) >> RM9200_USB_DIV_SHIFT;
	266	if (usb->divisors[usbdiv])
	267	return parent_rate / usb->divisors[usbdiv];
	268
	269	return 0;
	270	}
	271
	272	static long at91rm9200_clk_usb_round_rate(struct clk_hw *hw, unsigned long rate,
	273	unsigned long *parent_rate)
	274	{
	275	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
13a6073d	276	struct clk *parent = __clk_get_parent(hw->clk);
c84a61d8 BB	277	unsigned long bestrate = 0;
	278	int bestdiff = -1;
	279	unsigned long tmprate;
	280	int tmpdiff;
	281	int i = 0;
	282
13a6073d BB	283	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	284	unsigned long tmp_parent_rate;
	285
c84a61d8 BB	286	if (!usb->divisors[i])
c84a61d8 BB	287	continue;
13a6073d BB	288
	289	tmp_parent_rate = rate * usb->divisors[i];
	290	tmp_parent_rate = __clk_round_rate(parent, tmp_parent_rate);
ff553ea1	291	tmprate = DIV_ROUND_CLOSEST(tmp_parent_rate, usb->divisors[i]);
c84a61d8 BB	292	if (tmprate < rate)
	293	tmpdiff = rate - tmprate;
	294	else
	295	tmpdiff = tmprate - rate;
	296
	297	if (bestdiff < 0 \|\| bestdiff > tmpdiff) {
	298	bestrate = tmprate;
	299	bestdiff = tmpdiff;
13a6073d	300	*parent_rate = tmp_parent_rate;
c84a61d8 BB	301	}
	302
	303	if (!bestdiff)
	304	break;
	305	}
	306
	307	return bestrate;
	308	}
	309
	310	static int at91rm9200_clk_usb_set_rate(struct clk_hw *hw, unsigned long rate,
	311	unsigned long parent_rate)
	312	{
	313	u32 tmp;
	314	int i;
	315	struct at91rm9200_clk_usb *usb = to_at91rm9200_clk_usb(hw);
	316	struct at91_pmc *pmc = usb->pmc;
16eeaec7	317	unsigned long div;
c84a61d8	318
ff553ea1	319	if (!rate)
c84a61d8	320	return -EINVAL;
16eeaec7	321
ff553ea1	322	div = DIV_ROUND_CLOSEST(parent_rate, rate);
16eeaec7	323
c84a61d8 BB	324	for (i = 0; i < RM9200_USB_DIV_TAB_SIZE; i++) {
	325	if (usb->divisors[i] == div) {
	326	tmp = pmc_read(pmc, AT91_CKGR_PLLBR) &
	327	~AT91_PMC_USBDIV;
	328	tmp \|= i << RM9200_USB_DIV_SHIFT;
	329	pmc_write(pmc, AT91_CKGR_PLLBR, tmp);
	330	return 0;
	331	}
	332	}
	333
	334	return -EINVAL;
	335	}
	336
	337	static const struct clk_ops at91rm9200_usb_ops = {
	338	.recalc_rate = at91rm9200_clk_usb_recalc_rate,
	339	.round_rate = at91rm9200_clk_usb_round_rate,
	340	.set_rate = at91rm9200_clk_usb_set_rate,
	341	};
	342
	343	static struct clk * __init
	344	at91rm9200_clk_register_usb(struct at91_pmc pmc, const char name,
	345	const char parent_name, const u32 divisors)
	346	{
	347	struct at91rm9200_clk_usb *usb;
	348	struct clk *clk = NULL;
	349	struct clk_init_data init;
	350
	351	usb = kzalloc(sizeof(*usb), GFP_KERNEL);
	352	if (!usb)
	353	return ERR_PTR(-ENOMEM);
	354
	355	init.name = name;
	356	init.ops = &at91rm9200_usb_ops;
	357	init.parent_names = &parent_name;
	358	init.num_parents = 1;
13a6073d	359	init.flags = CLK_SET_RATE_PARENT;
c84a61d8 BB	360
	361	usb->hw.init = &init;
	362	usb->pmc = pmc;
	363	memcpy(usb->divisors, divisors, sizeof(usb->divisors));
	364
	365	clk = clk_register(NULL, &usb->hw);
	366	if (IS_ERR(clk))
	367	kfree(usb);
	368
	369	return clk;
	370	}
	371
	372	void __init of_at91sam9x5_clk_usb_setup(struct device_node *np,
	373	struct at91_pmc *pmc)
	374	{
	375	struct clk *clk;
	376	int i;
	377	int num_parents;
	378	const char *parent_names[USB_SOURCE_MAX];
	379	const char *name = np->name;
	380
	381	num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
	382	if (num_parents <= 0 \|\| num_parents > USB_SOURCE_MAX)
	383	return;
	384
	385	for (i = 0; i < num_parents; i++) {
	386	parent_names[i] = of_clk_get_parent_name(np, i);
	387	if (!parent_names[i])
	388	return;
	389	}
	390
	391	of_property_read_string(np, "clock-output-names", &name);
	392
	393	clk = at91sam9x5_clk_register_usb(pmc, name, parent_names, num_parents);
	394	if (IS_ERR(clk))
	395	return;
	396
	397	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	398	}
	399
	400	void __init of_at91sam9n12_clk_usb_setup(struct device_node *np,
	401	struct at91_pmc *pmc)
	402	{
	403	struct clk *clk;
	404	const char *parent_name;
	405	const char *name = np->name;
	406
	407	parent_name = of_clk_get_parent_name(np, 0);
	408	if (!parent_name)
	409	return;
	410
	411	of_property_read_string(np, "clock-output-names", &name);
	412
	413	clk = at91sam9n12_clk_register_usb(pmc, name, parent_name);
	414	if (IS_ERR(clk))
	415	return;
	416
	417	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	418	}
	419
	420	void __init of_at91rm9200_clk_usb_setup(struct device_node *np,
	421	struct at91_pmc *pmc)
	422	{
	423	struct clk *clk;
424	const char *parent_name;
425	const char *name = np->name;
426	u32 divisors[4] = {0, 0, 0, 0};
427
428	parent_name = of_clk_get_parent_name(np, 0);
429	if (!parent_name)
430	return;
431
432	of_property_read_u32_array(np, "atmel,clk-divisors", divisors, 4);
433	if (!divisors[0])
434	return;
435
436	of_property_read_string(np, "clock-output-names", &name);
437
438	clk = at91rm9200_clk_register_usb(pmc, name, parent_name, divisors);
439	if (IS_ERR(clk))
440	return;
441
442	of_clk_add_provider(np, of_clk_src_simple_get, clk);
443	}