[deliverable/linux.git] / drivers / clk / at91 / clk-utmi.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/interrupt.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/sched.h>
#include <linux/wait.h>

#include "pmc.h"

#define UTMI_FIXED_MUL		40

struct clk_utmi {
	struct clk_hw hw;
	struct at91_pmc *pmc;
	unsigned int irq;
	wait_queue_head_t wait;
};

#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)

static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
{
	struct clk_utmi *utmi = (struct clk_utmi *)dev_id;

	wake_up(&utmi->wait);
	disable_irq_nosync(utmi->irq);

	return IRQ_HANDLED;
}

static int clk_utmi_prepare(struct clk_hw *hw)
{
	struct clk_utmi *utmi = to_clk_utmi(hw);
	struct at91_pmc *pmc = utmi->pmc;
	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) | AT91_PMC_UPLLEN |
		  AT91_PMC_UPLLCOUNT | AT91_PMC_BIASEN;

	pmc_write(pmc, AT91_CKGR_UCKR, tmp);

	while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {
		enable_irq(utmi->irq);
		wait_event(utmi->wait,
			   pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
	}

	return 0;
}

static int clk_utmi_is_prepared(struct clk_hw *hw)
{
	struct clk_utmi *utmi = to_clk_utmi(hw);
	struct at91_pmc *pmc = utmi->pmc;

	return !!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
}

static void clk_utmi_unprepare(struct clk_hw *hw)
{
	struct clk_utmi *utmi = to_clk_utmi(hw);
	struct at91_pmc *pmc = utmi->pmc;
	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) & ~AT91_PMC_UPLLEN;

	pmc_write(pmc, AT91_CKGR_UCKR, tmp);
}

static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
					  unsigned long parent_rate)
{
	/* UTMI clk is a fixed clk multiplier */
	return parent_rate * UTMI_FIXED_MUL;
}

static const struct clk_ops utmi_ops = {
	.prepare = clk_utmi_prepare,
	.unprepare = clk_utmi_unprepare,
	.is_prepared = clk_utmi_is_prepared,
	.recalc_rate = clk_utmi_recalc_rate,
};

static struct clk * __init
at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
		       const char *name, const char *parent_name)
{
	int ret;
	struct clk_utmi *utmi;
	struct clk *clk = NULL;
	struct clk_init_data init;

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

	init.name = name;
	init.ops = &utmi_ops;
	init.parent_names = parent_name ? &parent_name : NULL;
	init.num_parents = parent_name ? 1 : 0;
	init.flags = CLK_SET_RATE_GATE;

	utmi->hw.init = &init;
	utmi->pmc = pmc;
	utmi->irq = irq;
	init_waitqueue_head(&utmi->wait);
	irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);
	ret = request_irq(utmi->irq, clk_utmi_irq_handler,
			  IRQF_TRIGGER_HIGH, "clk-utmi", utmi);
	if (ret)
		return ERR_PTR(ret);

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

	return clk;
}

static void __init
of_at91_clk_utmi_setup(struct device_node *np, struct at91_pmc *pmc)
{
	unsigned int irq;
	struct clk *clk;
	const char *parent_name;
	const char *name = np->name;

	parent_name = of_clk_get_parent_name(np, 0);

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

	irq = irq_of_parse_and_map(np, 0);
	if (!irq)
		return;

	clk = at91_clk_register_utmi(pmc, irq, name, parent_name);
	if (IS_ERR(clk))
		return;

	of_clk_add_provider(np, of_clk_src_simple_get, clk);
	return;
}

void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
					 struct at91_pmc *pmc)
{
	of_at91_clk_utmi_setup(np, pmc);
}
Commit	Line	Data
f090fb37 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/interrupt.h>
	15	#include <linux/irq.h>
	16	#include <linux/of.h>
	17	#include <linux/of_address.h>
	18	#include <linux/of_irq.h>
	19	#include <linux/io.h>
	20	#include <linux/sched.h>
	21	#include <linux/wait.h>
	22
	23	#include "pmc.h"
	24
	25	#define UTMI_FIXED_MUL 40
	26
	27	struct clk_utmi {
	28	struct clk_hw hw;
	29	struct at91_pmc *pmc;
	30	unsigned int irq;
	31	wait_queue_head_t wait;
	32	};
	33
	34	#define to_clk_utmi(hw) container_of(hw, struct clk_utmi, hw)
	35
	36	static irqreturn_t clk_utmi_irq_handler(int irq, void *dev_id)
	37	{
	38	struct clk_utmi utmi = (struct clk_utmi )dev_id;
	39
	40	wake_up(&utmi->wait);
	41	disable_irq_nosync(utmi->irq);
	42
	43	return IRQ_HANDLED;
	44	}
	45
	46	static int clk_utmi_prepare(struct clk_hw *hw)
	47	{
	48	struct clk_utmi *utmi = to_clk_utmi(hw);
	49	struct at91_pmc *pmc = utmi->pmc;
	50	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) \| AT91_PMC_UPLLEN \|
	51	AT91_PMC_UPLLCOUNT \| AT91_PMC_BIASEN;
	52
	53	pmc_write(pmc, AT91_CKGR_UCKR, tmp);
	54
	55	while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU)) {
	56	enable_irq(utmi->irq);
	57	wait_event(utmi->wait,
	58	pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
	59	}
	60
	61	return 0;
	62	}
	63
	64	static int clk_utmi_is_prepared(struct clk_hw *hw)
65	{
66	struct clk_utmi *utmi = to_clk_utmi(hw);
67	struct at91_pmc *pmc = utmi->pmc;
68
69	return !!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_LOCKU);
70	}
71
72	static void clk_utmi_unprepare(struct clk_hw *hw)
73	{
74	struct clk_utmi *utmi = to_clk_utmi(hw);
75	struct at91_pmc *pmc = utmi->pmc;
76	u32 tmp = at91_pmc_read(AT91_CKGR_UCKR) & ~AT91_PMC_UPLLEN;
77
78	pmc_write(pmc, AT91_CKGR_UCKR, tmp);
79	}
80
81	static unsigned long clk_utmi_recalc_rate(struct clk_hw *hw,
82	unsigned long parent_rate)
83	{
84	/* UTMI clk is a fixed clk multiplier */
85	return parent_rate * UTMI_FIXED_MUL;
86	}
87
88	static const struct clk_ops utmi_ops = {
89	.prepare = clk_utmi_prepare,
90	.unprepare = clk_utmi_unprepare,
91	.is_prepared = clk_utmi_is_prepared,
92	.recalc_rate = clk_utmi_recalc_rate,
93	};
94
95	static struct clk * __init
96	at91_clk_register_utmi(struct at91_pmc *pmc, unsigned int irq,
97	const char name, const char parent_name)
98	{
99	int ret;
100	struct clk_utmi *utmi;
101	struct clk *clk = NULL;
102	struct clk_init_data init;
103
104	utmi = kzalloc(sizeof(*utmi), GFP_KERNEL);
105	if (!utmi)
106	return ERR_PTR(-ENOMEM);
107
108	init.name = name;
109	init.ops = &utmi_ops;
110	init.parent_names = parent_name ? &parent_name : NULL;
111	init.num_parents = parent_name ? 1 : 0;
112	init.flags = CLK_SET_RATE_GATE;
113
114	utmi->hw.init = &init;
115	utmi->pmc = pmc;
116	utmi->irq = irq;
117	init_waitqueue_head(&utmi->wait);
118	irq_set_status_flags(utmi->irq, IRQ_NOAUTOEN);
119	ret = request_irq(utmi->irq, clk_utmi_irq_handler,
120	IRQF_TRIGGER_HIGH, "clk-utmi", utmi);
121	if (ret)
122	return ERR_PTR(ret);
123
124	clk = clk_register(NULL, &utmi->hw);
125	if (IS_ERR(clk))
126	kfree(utmi);
127
128	return clk;
129	}
130
131	static void __init
132	of_at91_clk_utmi_setup(struct device_node np, struct at91_pmc pmc)
133	{
134	unsigned int irq;
135	struct clk *clk;
136	const char *parent_name;
137	const char *name = np->name;
138
139	parent_name = of_clk_get_parent_name(np, 0);
140
141	of_property_read_string(np, "clock-output-names", &name);
142
143	irq = irq_of_parse_and_map(np, 0);
144	if (!irq)
145	return;
146
147	clk = at91_clk_register_utmi(pmc, irq, name, parent_name);
148	if (IS_ERR(clk))
149	return;
150
151	of_clk_add_provider(np, of_clk_src_simple_get, clk);
152	return;
153	}
154
155	void __init of_at91sam9x5_clk_utmi_setup(struct device_node *np,
156	struct at91_pmc *pmc)
157	{
158	of_at91_clk_utmi_setup(np, pmc);
159	}