[linux-2.6-block.git] / drivers / clk / ti / apll.c

/*
 * OMAP APLL clock support
 *
 * Copyright (C) 2013 Texas Instruments, Inc.
 *
 * J Keerthy <j-keerthy@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/log2.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>
#include <linux/delay.h>

#include "clock.h"

#define APLL_FORCE_LOCK 0x1
#define APLL_AUTO_IDLE	0x2
#define MAX_APLL_WAIT_TRIES		1000000

#undef pr_fmt
#define pr_fmt(fmt) "%s: " fmt, __func__

static int dra7_apll_enable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	int r = 0, i = 0;
	struct dpll_data *ad;
	const char *clk_name;
	u8 state = 1;
	u32 v;

	ad = clk->dpll_data;
	if (!ad)
		return -EINVAL;

	clk_name = clk_hw_get_name(&clk->hw);

	state <<= __ffs(ad->idlest_mask);

	/* Check is already locked */
	v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);

	if ((v & ad->idlest_mask) == state)
		return r;

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ~ad->enable_mask;
	v |= APLL_FORCE_LOCK << __ffs(ad->enable_mask);
	ti_clk_ll_ops->clk_writel(v, ad->control_reg);

	state <<= __ffs(ad->idlest_mask);

	while (1) {
		v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
		if ((v & ad->idlest_mask) == state)
			break;
		if (i > MAX_APLL_WAIT_TRIES)
			break;
		i++;
		udelay(1);
	}

	if (i == MAX_APLL_WAIT_TRIES) {
		pr_warn("clock: %s failed transition to '%s'\n",
			clk_name, (state) ? "locked" : "bypassed");
		r = -EBUSY;
	} else
		pr_debug("clock: %s transition to '%s' in %d loops\n",
			 clk_name, (state) ? "locked" : "bypassed", i);

	return r;
}

static void dra7_apll_disable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct dpll_data *ad;
	u8 state = 1;
	u32 v;

	ad = clk->dpll_data;

	state <<= __ffs(ad->idlest_mask);

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ~ad->enable_mask;
	v |= APLL_AUTO_IDLE << __ffs(ad->enable_mask);
	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
}

static int dra7_apll_is_enabled(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct dpll_data *ad;
	u32 v;

	ad = clk->dpll_data;

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ad->enable_mask;

	v >>= __ffs(ad->enable_mask);

	return v == APLL_AUTO_IDLE ? 0 : 1;
}

static u8 dra7_init_apll_parent(struct clk_hw *hw)
{
	return 0;
}

static const struct clk_ops apll_ck_ops = {
	.enable		= &dra7_apll_enable,
	.disable	= &dra7_apll_disable,
	.is_enabled	= &dra7_apll_is_enabled,
	.get_parent	= &dra7_init_apll_parent,
};

static void __init omap_clk_register_apll(struct clk_hw *hw,
					  struct device_node *node)
{
	struct clk_hw_omap *clk_hw = to_clk_hw_omap(hw);
	struct dpll_data *ad = clk_hw->dpll_data;
	struct clk *clk;

	clk = of_clk_get(node, 0);
	if (IS_ERR(clk)) {
		pr_debug("clk-ref for %s not ready, retry\n",
			 node->name);
		if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
			return;

		goto cleanup;
	}

	ad->clk_ref = __clk_get_hw(clk);

	clk = of_clk_get(node, 1);
	if (IS_ERR(clk)) {
		pr_debug("clk-bypass for %s not ready, retry\n",
			 node->name);
		if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
			return;

		goto cleanup;
	}

	ad->clk_bypass = __clk_get_hw(clk);

	clk = ti_clk_register(NULL, &clk_hw->hw, node->name);
	if (!IS_ERR(clk)) {
		of_clk_add_provider(node, of_clk_src_simple_get, clk);
		kfree(clk_hw->hw.init->parent_names);
		kfree(clk_hw->hw.init);
		return;
	}

cleanup:
	kfree(clk_hw->dpll_data);
	kfree(clk_hw->hw.init->parent_names);
	kfree(clk_hw->hw.init);
	kfree(clk_hw);
}

static void __init of_dra7_apll_setup(struct device_node *node)
{
	struct dpll_data *ad = NULL;
	struct clk_hw_omap *clk_hw = NULL;
	struct clk_init_data *init = NULL;
	const char **parent_names = NULL;

	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	init = kzalloc(sizeof(*init), GFP_KERNEL);
	if (!ad || !clk_hw || !init)
		goto cleanup;

	clk_hw->dpll_data = ad;
	clk_hw->hw.init = init;

	init->name = node->name;
	init->ops = &apll_ck_ops;

	init->num_parents = of_clk_get_parent_count(node);
	if (init->num_parents < 1) {
		pr_err("dra7 apll %s must have parent(s)\n", node->name);
		goto cleanup;
	}

	parent_names = kzalloc(sizeof(char *) * init->num_parents, GFP_KERNEL);
	if (!parent_names)
		goto cleanup;

	of_clk_parent_fill(node, parent_names, init->num_parents);

	init->parent_names = parent_names;

	ad->control_reg = ti_clk_get_reg_addr(node, 0);
	ad->idlest_reg = ti_clk_get_reg_addr(node, 1);

	if (IS_ERR(ad->control_reg) || IS_ERR(ad->idlest_reg))
		goto cleanup;

	ad->idlest_mask = 0x1;
	ad->enable_mask = 0x3;

	omap_clk_register_apll(&clk_hw->hw, node);
	return;

cleanup:
	kfree(parent_names);
	kfree(ad);
	kfree(clk_hw);
	kfree(init);
}
CLK_OF_DECLARE(dra7_apll_clock, "ti,dra7-apll-clock", of_dra7_apll_setup);

#define OMAP2_EN_APLL_LOCKED	0x3
#define OMAP2_EN_APLL_STOPPED	0x0

static int omap2_apll_is_enabled(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct dpll_data *ad = clk->dpll_data;
	u32 v;

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ad->enable_mask;

	v >>= __ffs(ad->enable_mask);

	return v == OMAP2_EN_APLL_LOCKED ? 1 : 0;
}

static unsigned long omap2_apll_recalc(struct clk_hw *hw,
				       unsigned long parent_rate)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);

	if (omap2_apll_is_enabled(hw))
		return clk->fixed_rate;

	return 0;
}

static int omap2_apll_enable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct dpll_data *ad = clk->dpll_data;
	u32 v;
	int i = 0;

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ~ad->enable_mask;
	v |= OMAP2_EN_APLL_LOCKED << __ffs(ad->enable_mask);
	ti_clk_ll_ops->clk_writel(v, ad->control_reg);

	while (1) {
		v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
		if (v & ad->idlest_mask)
			break;
		if (i > MAX_APLL_WAIT_TRIES)
			break;
		i++;
		udelay(1);
	}

	if (i == MAX_APLL_WAIT_TRIES) {
		pr_warn("%s failed to transition to locked\n",
			clk_hw_get_name(&clk->hw));
		return -EBUSY;
	}

	return 0;
}

static void omap2_apll_disable(struct clk_hw *hw)
{
	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	struct dpll_data *ad = clk->dpll_data;
	u32 v;

	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	v &= ~ad->enable_mask;
	v |= OMAP2_EN_APLL_STOPPED << __ffs(ad->enable_mask);
	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
}

static struct clk_ops omap2_apll_ops = {
	.enable		= &omap2_apll_enable,
	.disable	= &omap2_apll_disable,
	.is_enabled	= &omap2_apll_is_enabled,
	.recalc_rate	= &omap2_apll_recalc,
};

static void omap2_apll_set_autoidle(struct clk_hw_omap *clk, u32 val)
{
	struct dpll_data *ad = clk->dpll_data;
	u32 v;

	v = ti_clk_ll_ops->clk_readl(ad->autoidle_reg);
	v &= ~ad->autoidle_mask;
	v |= val << __ffs(ad->autoidle_mask);
	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
}

#define OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP	0x3
#define OMAP2_APLL_AUTOIDLE_DISABLE		0x0

static void omap2_apll_allow_idle(struct clk_hw_omap *clk)
{
	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP);
}

static void omap2_apll_deny_idle(struct clk_hw_omap *clk)
{
	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_DISABLE);
}

static const struct clk_hw_omap_ops omap2_apll_hwops = {
	.allow_idle	= &omap2_apll_allow_idle,
	.deny_idle	= &omap2_apll_deny_idle,
};

static void __init of_omap2_apll_setup(struct device_node *node)
{
	struct dpll_data *ad = NULL;
	struct clk_hw_omap *clk_hw = NULL;
	struct clk_init_data *init = NULL;
	struct clk *clk;
	const char *parent_name;
	u32 val;

	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	init = kzalloc(sizeof(*init), GFP_KERNEL);

	if (!ad || !clk_hw || !init)
		goto cleanup;

	clk_hw->dpll_data = ad;
	clk_hw->hw.init = init;
	init->ops = &omap2_apll_ops;
	init->name = node->name;
	clk_hw->ops = &omap2_apll_hwops;

	init->num_parents = of_clk_get_parent_count(node);
	if (init->num_parents != 1) {
		pr_err("%s must have one parent\n", node->name);
		goto cleanup;
	}

	parent_name = of_clk_get_parent_name(node, 0);
	init->parent_names = &parent_name;

	if (of_property_read_u32(node, "ti,clock-frequency", &val)) {
		pr_err("%s missing clock-frequency\n", node->name);
		goto cleanup;
	}
	clk_hw->fixed_rate = val;

	if (of_property_read_u32(node, "ti,bit-shift", &val)) {
		pr_err("%s missing bit-shift\n", node->name);
		goto cleanup;
	}

	clk_hw->enable_bit = val;
	ad->enable_mask = 0x3 << val;
	ad->autoidle_mask = 0x3 << val;

	if (of_property_read_u32(node, "ti,idlest-shift", &val)) {
		pr_err("%s missing idlest-shift\n", node->name);
		goto cleanup;
	}

	ad->idlest_mask = 1 << val;

	ad->control_reg = ti_clk_get_reg_addr(node, 0);
	ad->autoidle_reg = ti_clk_get_reg_addr(node, 1);
	ad->idlest_reg = ti_clk_get_reg_addr(node, 2);

	if (IS_ERR(ad->control_reg) || IS_ERR(ad->autoidle_reg) ||
	    IS_ERR(ad->idlest_reg))
		goto cleanup;

	clk = clk_register(NULL, &clk_hw->hw);
	if (!IS_ERR(clk)) {
		of_clk_add_provider(node, of_clk_src_simple_get, clk);
		kfree(init);
		return;
	}
cleanup:
	kfree(ad);
	kfree(clk_hw);
	kfree(init);
}
CLK_OF_DECLARE(omap2_apll_clock, "ti,omap2-apll-clock",
	       of_omap2_apll_setup);
Commit	Line	Data
3cf467a9 K	1	/*
	2	* OMAP APLL clock support
	3	*
	4	* Copyright (C) 2013 Texas Instruments, Inc.
	5	*
	6	* J Keerthy <j-keerthy@ti.com>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed "as is" WITHOUT ANY WARRANTY of any
	13	* kind, whether express or implied; without even the implied warranty
	14	* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
1b29e601	18	#include <linux/clk.h>
3cf467a9 K	19	#include <linux/clk-provider.h>
	20	#include <linux/module.h>
	21	#include <linux/slab.h>
	22	#include <linux/io.h>
	23	#include <linux/err.h>
	24	#include <linux/string.h>
	25	#include <linux/log2.h>
	26	#include <linux/of.h>
	27	#include <linux/of_address.h>
	28	#include <linux/clk/ti.h>
	29	#include <linux/delay.h>
	30
a3314e9c TK	31	#include "clock.h"
a3314e9c TK	32
3cf467a9 K	33	#define APLL_FORCE_LOCK 0x1
	34	#define APLL_AUTO_IDLE 0x2
	35	#define MAX_APLL_WAIT_TRIES 1000000
	36
	37	#undef pr_fmt
	38	#define pr_fmt(fmt) "%s: " fmt, __func__
	39
	40	static int dra7_apll_enable(struct clk_hw *hw)
	41	{
	42	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	43	int r = 0, i = 0;
	44	struct dpll_data *ad;
	45	const char *clk_name;
	46	u8 state = 1;
	47	u32 v;
	48
	49	ad = clk->dpll_data;
	50	if (!ad)
	51	return -EINVAL;
	52
836ee0f7	53	clk_name = clk_hw_get_name(&clk->hw);
3cf467a9 K	54
	55	state <<= __ffs(ad->idlest_mask);
	56
	57	/* Check is already locked */
	58	v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
	59
	60	if ((v & ad->idlest_mask) == state)
	61	return r;
	62
	63	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	64	v &= ~ad->enable_mask;
	65	v \|= APLL_FORCE_LOCK << __ffs(ad->enable_mask);
	66	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
	67
	68	state <<= __ffs(ad->idlest_mask);
	69
	70	while (1) {
	71	v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
	72	if ((v & ad->idlest_mask) == state)
	73	break;
	74	if (i > MAX_APLL_WAIT_TRIES)
	75	break;
	76	i++;
	77	udelay(1);
	78	}
	79
	80	if (i == MAX_APLL_WAIT_TRIES) {
	81	pr_warn("clock: %s failed transition to '%s'\n",
	82	clk_name, (state) ? "locked" : "bypassed");
8d2f9e8e JL	83	r = -EBUSY;
8d2f9e8e JL	84	} else
3cf467a9 K	85	pr_debug("clock: %s transition to '%s' in %d loops\n",
	86	clk_name, (state) ? "locked" : "bypassed", i);
	87
3cf467a9 K	88	return r;
	89	}
	90
	91	static void dra7_apll_disable(struct clk_hw *hw)
	92	{
	93	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	94	struct dpll_data *ad;
	95	u8 state = 1;
	96	u32 v;
	97
	98	ad = clk->dpll_data;
	99
	100	state <<= __ffs(ad->idlest_mask);
	101
	102	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	103	v &= ~ad->enable_mask;
	104	v \|= APLL_AUTO_IDLE << __ffs(ad->enable_mask);
	105	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
	106	}
	107
	108	static int dra7_apll_is_enabled(struct clk_hw *hw)
	109	{
	110	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	111	struct dpll_data *ad;
	112	u32 v;
	113
	114	ad = clk->dpll_data;
	115
	116	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	117	v &= ad->enable_mask;
	118
	119	v >>= __ffs(ad->enable_mask);
	120
	121	return v == APLL_AUTO_IDLE ? 0 : 1;
	122	}
	123
	124	static u8 dra7_init_apll_parent(struct clk_hw *hw)
	125	{
	126	return 0;
	127	}
	128
	129	static const struct clk_ops apll_ck_ops = {
	130	.enable = &dra7_apll_enable,
	131	.disable = &dra7_apll_disable,
	132	.is_enabled = &dra7_apll_is_enabled,
	133	.get_parent = &dra7_init_apll_parent,
	134	};
	135
	136	static void __init omap_clk_register_apll(struct clk_hw *hw,
	137	struct device_node *node)
	138	{
	139	struct clk_hw_omap *clk_hw = to_clk_hw_omap(hw);
	140	struct dpll_data *ad = clk_hw->dpll_data;
	141	struct clk *clk;
	142
b6f51284 TK	143	clk = of_clk_get(node, 0);
	144	if (IS_ERR(clk)) {
	145	pr_debug("clk-ref for %s not ready, retry\n",
	146	node->name);
	147	if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
	148	return;
	149
	150	goto cleanup;
	151	}
3cf467a9	152
b6f51284 TK	153	ad->clk_ref = __clk_get_hw(clk);
	154
	155	clk = of_clk_get(node, 1);
	156	if (IS_ERR(clk)) {
	157	pr_debug("clk-bypass for %s not ready, retry\n",
3cf467a9 K	158	node->name);
	159	if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
	160	return;
	161
	162	goto cleanup;
	163	}
	164
b6f51284 TK	165	ad->clk_bypass = __clk_get_hw(clk);
b6f51284 TK	166
1ae79c46	167	clk = ti_clk_register(NULL, &clk_hw->hw, node->name);
3cf467a9 K	168	if (!IS_ERR(clk)) {
	169	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	170	kfree(clk_hw->hw.init->parent_names);
	171	kfree(clk_hw->hw.init);
	172	return;
	173	}
	174
	175	cleanup:
	176	kfree(clk_hw->dpll_data);
	177	kfree(clk_hw->hw.init->parent_names);
	178	kfree(clk_hw->hw.init);
	179	kfree(clk_hw);
	180	}
	181
	182	static void __init of_dra7_apll_setup(struct device_node *node)
	183	{
	184	struct dpll_data *ad = NULL;
	185	struct clk_hw_omap *clk_hw = NULL;
	186	struct clk_init_data *init = NULL;
	187	const char **parent_names = NULL;
3cf467a9 K	188
	189	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
	190	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	191	init = kzalloc(sizeof(*init), GFP_KERNEL);
	192	if (!ad \|\| !clk_hw \|\| !init)
	193	goto cleanup;
	194
	195	clk_hw->dpll_data = ad;
	196	clk_hw->hw.init = init;
3cf467a9 K	197
	198	init->name = node->name;
	199	init->ops = &apll_ck_ops;
	200
	201	init->num_parents = of_clk_get_parent_count(node);
	202	if (init->num_parents < 1) {
	203	pr_err("dra7 apll %s must have parent(s)\n", node->name);
	204	goto cleanup;
	205	}
	206
	207	parent_names = kzalloc(sizeof(char ) init->num_parents, GFP_KERNEL);
	208	if (!parent_names)
	209	goto cleanup;
	210
9da9e761	211	of_clk_parent_fill(node, parent_names, init->num_parents);
3cf467a9 K	212
	213	init->parent_names = parent_names;
	214
	215	ad->control_reg = ti_clk_get_reg_addr(node, 0);
	216	ad->idlest_reg = ti_clk_get_reg_addr(node, 1);
	217
c807dbed	218	if (IS_ERR(ad->control_reg) \|\| IS_ERR(ad->idlest_reg))
3cf467a9 K	219	goto cleanup;
	220
	221	ad->idlest_mask = 0x1;
	222	ad->enable_mask = 0x3;
	223
	224	omap_clk_register_apll(&clk_hw->hw, node);
	225	return;
	226
	227	cleanup:
	228	kfree(parent_names);
	229	kfree(ad);
	230	kfree(clk_hw);
	231	kfree(init);
	232	}
	233	CLK_OF_DECLARE(dra7_apll_clock, "ti,dra7-apll-clock", of_dra7_apll_setup);
4d008589 TK	234
	235	#define OMAP2_EN_APLL_LOCKED 0x3
	236	#define OMAP2_EN_APLL_STOPPED 0x0
	237
	238	static int omap2_apll_is_enabled(struct clk_hw *hw)
	239	{
	240	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	241	struct dpll_data *ad = clk->dpll_data;
	242	u32 v;
	243
	244	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	245	v &= ad->enable_mask;
	246
	247	v >>= __ffs(ad->enable_mask);
	248
	249	return v == OMAP2_EN_APLL_LOCKED ? 1 : 0;
	250	}
	251
	252	static unsigned long omap2_apll_recalc(struct clk_hw *hw,
	253	unsigned long parent_rate)
	254	{
	255	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	256
	257	if (omap2_apll_is_enabled(hw))
	258	return clk->fixed_rate;
	259
	260	return 0;
	261	}
	262
	263	static int omap2_apll_enable(struct clk_hw *hw)
	264	{
	265	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	266	struct dpll_data *ad = clk->dpll_data;
	267	u32 v;
	268	int i = 0;
	269
	270	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	271	v &= ~ad->enable_mask;
	272	v \|= OMAP2_EN_APLL_LOCKED << __ffs(ad->enable_mask);
	273	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
	274
	275	while (1) {
	276	v = ti_clk_ll_ops->clk_readl(ad->idlest_reg);
	277	if (v & ad->idlest_mask)
	278	break;
	279	if (i > MAX_APLL_WAIT_TRIES)
	280	break;
	281	i++;
	282	udelay(1);
	283	}
	284
	285	if (i == MAX_APLL_WAIT_TRIES) {
	286	pr_warn("%s failed to transition to locked\n",
836ee0f7	287	clk_hw_get_name(&clk->hw));
4d008589 TK	288	return -EBUSY;
	289	}
	290
	291	return 0;
	292	}
	293
	294	static void omap2_apll_disable(struct clk_hw *hw)
	295	{
	296	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	297	struct dpll_data *ad = clk->dpll_data;
	298	u32 v;
	299
	300	v = ti_clk_ll_ops->clk_readl(ad->control_reg);
	301	v &= ~ad->enable_mask;
	302	v \|= OMAP2_EN_APLL_STOPPED << __ffs(ad->enable_mask);
	303	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
	304	}
	305
	306	static struct clk_ops omap2_apll_ops = {
	307	.enable = &omap2_apll_enable,
	308	.disable = &omap2_apll_disable,
	309	.is_enabled = &omap2_apll_is_enabled,
	310	.recalc_rate = &omap2_apll_recalc,
	311	};
	312
	313	static void omap2_apll_set_autoidle(struct clk_hw_omap *clk, u32 val)
	314	{
	315	struct dpll_data *ad = clk->dpll_data;
	316	u32 v;
	317
	318	v = ti_clk_ll_ops->clk_readl(ad->autoidle_reg);
	319	v &= ~ad->autoidle_mask;
	320	v \|= val << __ffs(ad->autoidle_mask);
	321	ti_clk_ll_ops->clk_writel(v, ad->control_reg);
	322	}
	323
	324	#define OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP 0x3
	325	#define OMAP2_APLL_AUTOIDLE_DISABLE 0x0
	326
	327	static void omap2_apll_allow_idle(struct clk_hw_omap *clk)
	328	{
	329	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP);
	330	}
	331
	332	static void omap2_apll_deny_idle(struct clk_hw_omap *clk)
	333	{
	334	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_DISABLE);
	335	}
	336
d687767a	337	static const struct clk_hw_omap_ops omap2_apll_hwops = {
4d008589 TK	338	.allow_idle = &omap2_apll_allow_idle,
	339	.deny_idle = &omap2_apll_deny_idle,
	340	};
	341
	342	static void __init of_omap2_apll_setup(struct device_node *node)
	343	{
	344	struct dpll_data *ad = NULL;
	345	struct clk_hw_omap *clk_hw = NULL;
	346	struct clk_init_data *init = NULL;
	347	struct clk *clk;
	348	const char *parent_name;
	349	u32 val;
	350
6c7ee890	351	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
4d008589 TK	352	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	353	init = kzalloc(sizeof(*init), GFP_KERNEL);
	354
	355	if (!ad \|\| !clk_hw \|\| !init)
	356	goto cleanup;
	357
	358	clk_hw->dpll_data = ad;
	359	clk_hw->hw.init = init;
	360	init->ops = &omap2_apll_ops;
	361	init->name = node->name;
	362	clk_hw->ops = &omap2_apll_hwops;
	363
	364	init->num_parents = of_clk_get_parent_count(node);
	365	if (init->num_parents != 1) {
	366	pr_err("%s must have one parent\n", node->name);
	367	goto cleanup;
	368	}
	369
	370	parent_name = of_clk_get_parent_name(node, 0);
	371	init->parent_names = &parent_name;
	372
	373	if (of_property_read_u32(node, "ti,clock-frequency", &val)) {
	374	pr_err("%s missing clock-frequency\n", node->name);
	375	goto cleanup;
	376	}
	377	clk_hw->fixed_rate = val;
	378
	379	if (of_property_read_u32(node, "ti,bit-shift", &val)) {
	380	pr_err("%s missing bit-shift\n", node->name);
	381	goto cleanup;
	382	}
	383
	384	clk_hw->enable_bit = val;
	385	ad->enable_mask = 0x3 << val;
	386	ad->autoidle_mask = 0x3 << val;
	387
	388	if (of_property_read_u32(node, "ti,idlest-shift", &val)) {
	389	pr_err("%s missing idlest-shift\n", node->name);
	390	goto cleanup;
	391	}
	392
	393	ad->idlest_mask = 1 << val;
	394
	395	ad->control_reg = ti_clk_get_reg_addr(node, 0);
	396	ad->autoidle_reg = ti_clk_get_reg_addr(node, 1);
	397	ad->idlest_reg = ti_clk_get_reg_addr(node, 2);
	398
c807dbed TK	399	if (IS_ERR(ad->control_reg) \|\| IS_ERR(ad->autoidle_reg) \|\|
c807dbed TK	400	IS_ERR(ad->idlest_reg))
4d008589 TK	401	goto cleanup;
	402
	403	clk = clk_register(NULL, &clk_hw->hw);
	404	if (!IS_ERR(clk)) {
	405	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	406	kfree(init);
	407	return;
	408	}
	409	cleanup:
	410	kfree(ad);
	411	kfree(clk_hw);
	412	kfree(init);
	413	}
	414	CLK_OF_DECLARE(omap2_apll_clock, "ti,omap2-apll-clock",
	415	of_omap2_apll_setup);