[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(void *user,
					  struct device_node *node)
{
	struct clk_hw *hw = user;
	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 %pOFn not ready, retry\n",
			 node);
		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 %pOFn not ready, retry\n",
			 node);
		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_omap_hw(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;
	int ret;

	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 %pOFn must have parent(s)\n", node);
		goto cleanup;
	}

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

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

	init->parent_names = parent_names;

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

	if (ret)
		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 const 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;
	int ret;

	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("%pOFn must have one parent\n", node);
		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("%pOFn missing clock-frequency\n", node);
		goto cleanup;
	}
	clk_hw->fixed_rate = val;

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

	ad->idlest_mask = 1 << val;

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

	if (ret)
		goto cleanup;

	clk = ti_clk_register_omap_hw(NULL, &clk_hw->hw, node->name);
	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 */
6c0afb50	58	v = ti_clk_ll_ops->clk_readl(&ad->idlest_reg);
3cf467a9 K	59
	60	if ((v & ad->idlest_mask) == state)
	61	return r;
	62
6c0afb50	63	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
3cf467a9 K	64	v &= ~ad->enable_mask;
3cf467a9 K	65	v \|= APLL_FORCE_LOCK << __ffs(ad->enable_mask);
6c0afb50	66	ti_clk_ll_ops->clk_writel(v, &ad->control_reg);
3cf467a9 K	67
	68	state <<= __ffs(ad->idlest_mask);
	69
	70	while (1) {
6c0afb50	71	v = ti_clk_ll_ops->clk_readl(&ad->idlest_reg);
3cf467a9 K	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
6c0afb50	102	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
3cf467a9 K	103	v &= ~ad->enable_mask;
3cf467a9 K	104	v \|= APLL_AUTO_IDLE << __ffs(ad->enable_mask);
6c0afb50	105	ti_clk_ll_ops->clk_writel(v, &ad->control_reg);
3cf467a9 K	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
6c0afb50	116	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
3cf467a9 K	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
ffb009b2	136	static void __init omap_clk_register_apll(void *user,
3cf467a9 K	137	struct device_node *node)
3cf467a9 K	138	{
ffb009b2	139	struct clk_hw *hw = user;
3cf467a9 K	140	struct clk_hw_omap *clk_hw = to_clk_hw_omap(hw);
	141	struct dpll_data *ad = clk_hw->dpll_data;
	142	struct clk *clk;
	143
b6f51284 TK	144	clk = of_clk_get(node, 0);
b6f51284 TK	145	if (IS_ERR(clk)) {
e665f029 RH	146	pr_debug("clk-ref for %pOFn not ready, retry\n",
e665f029 RH	147	node);
b6f51284 TK	148	if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
	149	return;
	150
	151	goto cleanup;
	152	}
3cf467a9	153
b6f51284 TK	154	ad->clk_ref = __clk_get_hw(clk);
	155
	156	clk = of_clk_get(node, 1);
	157	if (IS_ERR(clk)) {
e665f029 RH	158	pr_debug("clk-bypass for %pOFn not ready, retry\n",
e665f029 RH	159	node);
3cf467a9 K	160	if (!ti_clk_retry_init(node, hw, omap_clk_register_apll))
	161	return;
	162
	163	goto cleanup;
	164	}
	165
b6f51284 TK	166	ad->clk_bypass = __clk_get_hw(clk);
b6f51284 TK	167
ead47825	168	clk = ti_clk_register_omap_hw(NULL, &clk_hw->hw, node->name);
3cf467a9 K	169	if (!IS_ERR(clk)) {
	170	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	171	kfree(clk_hw->hw.init->parent_names);
	172	kfree(clk_hw->hw.init);
	173	return;
	174	}
	175
	176	cleanup:
	177	kfree(clk_hw->dpll_data);
	178	kfree(clk_hw->hw.init->parent_names);
	179	kfree(clk_hw->hw.init);
	180	kfree(clk_hw);
	181	}
	182
	183	static void __init of_dra7_apll_setup(struct device_node *node)
	184	{
	185	struct dpll_data *ad = NULL;
	186	struct clk_hw_omap *clk_hw = NULL;
	187	struct clk_init_data *init = NULL;
	188	const char **parent_names = NULL;
6c0afb50	189	int ret;
3cf467a9 K	190
	191	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
	192	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	193	init = kzalloc(sizeof(*init), GFP_KERNEL);
	194	if (!ad \|\| !clk_hw \|\| !init)
	195	goto cleanup;
	196
	197	clk_hw->dpll_data = ad;
	198	clk_hw->hw.init = init;
3cf467a9 K	199
	200	init->name = node->name;
	201	init->ops = &apll_ck_ops;
	202
	203	init->num_parents = of_clk_get_parent_count(node);
	204	if (init->num_parents < 1) {
e665f029	205	pr_err("dra7 apll %pOFn must have parent(s)\n", node);
3cf467a9 K	206	goto cleanup;
	207	}
	208
6396bb22	209	parent_names = kcalloc(init->num_parents, sizeof(char *), GFP_KERNEL);
3cf467a9 K	210	if (!parent_names)
	211	goto cleanup;
	212
9da9e761	213	of_clk_parent_fill(node, parent_names, init->num_parents);
3cf467a9 K	214
	215	init->parent_names = parent_names;
	216
6c0afb50 TK	217	ret = ti_clk_get_reg_addr(node, 0, &ad->control_reg);
6c0afb50 TK	218	ret \|= ti_clk_get_reg_addr(node, 1, &ad->idlest_reg);
3cf467a9	219
6c0afb50	220	if (ret)
3cf467a9 K	221	goto cleanup;
	222
	223	ad->idlest_mask = 0x1;
	224	ad->enable_mask = 0x3;
	225
	226	omap_clk_register_apll(&clk_hw->hw, node);
	227	return;
	228
	229	cleanup:
	230	kfree(parent_names);
	231	kfree(ad);
	232	kfree(clk_hw);
	233	kfree(init);
	234	}
	235	CLK_OF_DECLARE(dra7_apll_clock, "ti,dra7-apll-clock", of_dra7_apll_setup);
4d008589 TK	236
	237	#define OMAP2_EN_APLL_LOCKED 0x3
	238	#define OMAP2_EN_APLL_STOPPED 0x0
	239
	240	static int omap2_apll_is_enabled(struct clk_hw *hw)
	241	{
	242	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	243	struct dpll_data *ad = clk->dpll_data;
	244	u32 v;
	245
6c0afb50	246	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
4d008589 TK	247	v &= ad->enable_mask;
	248
	249	v >>= __ffs(ad->enable_mask);
	250
	251	return v == OMAP2_EN_APLL_LOCKED ? 1 : 0;
	252	}
	253
	254	static unsigned long omap2_apll_recalc(struct clk_hw *hw,
	255	unsigned long parent_rate)
	256	{
	257	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	258
	259	if (omap2_apll_is_enabled(hw))
	260	return clk->fixed_rate;
	261
	262	return 0;
	263	}
	264
	265	static int omap2_apll_enable(struct clk_hw *hw)
	266	{
	267	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	268	struct dpll_data *ad = clk->dpll_data;
	269	u32 v;
	270	int i = 0;
	271
6c0afb50	272	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
4d008589 TK	273	v &= ~ad->enable_mask;
4d008589 TK	274	v \|= OMAP2_EN_APLL_LOCKED << __ffs(ad->enable_mask);
6c0afb50	275	ti_clk_ll_ops->clk_writel(v, &ad->control_reg);
4d008589 TK	276
4d008589 TK	277	while (1) {
6c0afb50	278	v = ti_clk_ll_ops->clk_readl(&ad->idlest_reg);
4d008589 TK	279	if (v & ad->idlest_mask)
	280	break;
	281	if (i > MAX_APLL_WAIT_TRIES)
	282	break;
	283	i++;
	284	udelay(1);
	285	}
	286
	287	if (i == MAX_APLL_WAIT_TRIES) {
	288	pr_warn("%s failed to transition to locked\n",
836ee0f7	289	clk_hw_get_name(&clk->hw));
4d008589 TK	290	return -EBUSY;
	291	}
	292
	293	return 0;
	294	}
	295
	296	static void omap2_apll_disable(struct clk_hw *hw)
	297	{
	298	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
	299	struct dpll_data *ad = clk->dpll_data;
	300	u32 v;
	301
6c0afb50	302	v = ti_clk_ll_ops->clk_readl(&ad->control_reg);
4d008589 TK	303	v &= ~ad->enable_mask;
4d008589 TK	304	v \|= OMAP2_EN_APLL_STOPPED << __ffs(ad->enable_mask);
6c0afb50	305	ti_clk_ll_ops->clk_writel(v, &ad->control_reg);
4d008589 TK	306	}
4d008589 TK	307
7cc566a8	308	static const struct clk_ops omap2_apll_ops = {
4d008589 TK	309	.enable = &omap2_apll_enable,
	310	.disable = &omap2_apll_disable,
	311	.is_enabled = &omap2_apll_is_enabled,
	312	.recalc_rate = &omap2_apll_recalc,
	313	};
	314
	315	static void omap2_apll_set_autoidle(struct clk_hw_omap *clk, u32 val)
	316	{
	317	struct dpll_data *ad = clk->dpll_data;
	318	u32 v;
	319
6c0afb50	320	v = ti_clk_ll_ops->clk_readl(&ad->autoidle_reg);
4d008589 TK	321	v &= ~ad->autoidle_mask;
4d008589 TK	322	v \|= val << __ffs(ad->autoidle_mask);
6c0afb50	323	ti_clk_ll_ops->clk_writel(v, &ad->control_reg);
4d008589 TK	324	}
	325
	326	#define OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP 0x3
	327	#define OMAP2_APLL_AUTOIDLE_DISABLE 0x0
	328
	329	static void omap2_apll_allow_idle(struct clk_hw_omap *clk)
	330	{
	331	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_LOW_POWER_STOP);
	332	}
	333
	334	static void omap2_apll_deny_idle(struct clk_hw_omap *clk)
	335	{
	336	omap2_apll_set_autoidle(clk, OMAP2_APLL_AUTOIDLE_DISABLE);
	337	}
	338
d687767a	339	static const struct clk_hw_omap_ops omap2_apll_hwops = {
4d008589 TK	340	.allow_idle = &omap2_apll_allow_idle,
	341	.deny_idle = &omap2_apll_deny_idle,
	342	};
	343
	344	static void __init of_omap2_apll_setup(struct device_node *node)
	345	{
	346	struct dpll_data *ad = NULL;
	347	struct clk_hw_omap *clk_hw = NULL;
	348	struct clk_init_data *init = NULL;
	349	struct clk *clk;
	350	const char *parent_name;
	351	u32 val;
6c0afb50	352	int ret;
4d008589	353
6c7ee890	354	ad = kzalloc(sizeof(*ad), GFP_KERNEL);
4d008589 TK	355	clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL);
	356	init = kzalloc(sizeof(*init), GFP_KERNEL);
	357
	358	if (!ad \|\| !clk_hw \|\| !init)
	359	goto cleanup;
	360
	361	clk_hw->dpll_data = ad;
	362	clk_hw->hw.init = init;
	363	init->ops = &omap2_apll_ops;
	364	init->name = node->name;
	365	clk_hw->ops = &omap2_apll_hwops;
	366
	367	init->num_parents = of_clk_get_parent_count(node);
	368	if (init->num_parents != 1) {
e665f029	369	pr_err("%pOFn must have one parent\n", node);
4d008589 TK	370	goto cleanup;
	371	}
	372
	373	parent_name = of_clk_get_parent_name(node, 0);
	374	init->parent_names = &parent_name;
	375
	376	if (of_property_read_u32(node, "ti,clock-frequency", &val)) {
e665f029	377	pr_err("%pOFn missing clock-frequency\n", node);
4d008589 TK	378	goto cleanup;
	379	}
	380	clk_hw->fixed_rate = val;
	381
	382	if (of_property_read_u32(node, "ti,bit-shift", &val)) {
e665f029	383	pr_err("%pOFn missing bit-shift\n", node);
4d008589 TK	384	goto cleanup;
	385	}
	386
	387	clk_hw->enable_bit = val;
	388	ad->enable_mask = 0x3 << val;
	389	ad->autoidle_mask = 0x3 << val;
	390
	391	if (of_property_read_u32(node, "ti,idlest-shift", &val)) {
e665f029	392	pr_err("%pOFn missing idlest-shift\n", node);
4d008589 TK	393	goto cleanup;
	394	}
	395
	396	ad->idlest_mask = 1 << val;
	397
6c0afb50 TK	398	ret = ti_clk_get_reg_addr(node, 0, &ad->control_reg);
	399	ret \|= ti_clk_get_reg_addr(node, 1, &ad->autoidle_reg);
	400	ret \|= ti_clk_get_reg_addr(node, 2, &ad->idlest_reg);
4d008589	401
6c0afb50	402	if (ret)
4d008589 TK	403	goto cleanup;
4d008589 TK	404
ead47825	405	clk = ti_clk_register_omap_hw(NULL, &clk_hw->hw, node->name);
4d008589 TK	406	if (!IS_ERR(clk)) {
	407	of_clk_add_provider(node, of_clk_src_simple_get, clk);
	408	kfree(init);
	409	return;
	410	}
	411	cleanup:
	412	kfree(ad);
	413	kfree(clk_hw);
	414	kfree(init);
	415	}
	416	CLK_OF_DECLARE(omap2_apll_clock, "ti,omap2-apll-clock",
	417	of_omap2_apll_setup);