summaryrefslogtreecommitdiffstats
path: root/drivers/clk/ti/gate.c
blob: 0cc1babad661d5fb78e8ae9ee124bd35e3fd95d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
/*
 * OMAP gate clock support
 *
 * Copyright (C) 2013 Texas Instruments, Inc.
 *
 * Tero Kristo <t-kristo@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-provider.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/ti.h>

#include "clock.h"

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

static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk);

static const struct clk_ops omap_gate_clkdm_clk_ops = {
	.init		= &omap2_init_clk_clkdm,
	.enable		= &omap2_clkops_enable_clkdm,
	.disable	= &omap2_clkops_disable_clkdm,
	.restore_context = clk_gate_restore_context,
};

const struct clk_ops omap_gate_clk_ops = {
	.init		= &omap2_init_clk_clkdm,
	.enable		= &omap2_dflt_clk_enable,
	.disable	= &omap2_dflt_clk_disable,
	.is_enabled	= &omap2_dflt_clk_is_enabled,
	.restore_context = clk_gate_restore_context,
};

static const struct clk_ops omap_gate_clk_hsdiv_restore_ops = {
	.init		= &omap2_init_clk_clkdm,
	.enable		= &omap36xx_gate_clk_enable_with_hsdiv_restore,
	.disable	= &omap2_dflt_clk_disable,
	.is_enabled	= &omap2_dflt_clk_is_enabled,
	.restore_context = clk_gate_restore_context,
};

/**
 * omap36xx_gate_clk_enable_with_hsdiv_restore - enable clocks suffering
 *         from HSDivider PWRDN problem Implements Errata ID: i556.
 * @clk: DPLL output struct clk
 *
 * 3630 only: dpll3_m3_ck, dpll4_m2_ck, dpll4_m3_ck, dpll4_m4_ck,
 * dpll4_m5_ck & dpll4_m6_ck dividers gets loaded with reset
 * valueafter their respective PWRDN bits are set.  Any dummy write
 * (Any other value different from the Read value) to the
 * corresponding CM_CLKSEL register will refresh the dividers.
 */
static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *hw)
{
	struct clk_omap_divider *parent;
	struct clk_hw *parent_hw;
	u32 dummy_v, orig_v;
	int ret;

	/* Clear PWRDN bit of HSDIVIDER */
	ret = omap2_dflt_clk_enable(hw);

	/* Parent is the x2 node, get parent of parent for the m2 div */
	parent_hw = clk_hw_get_parent(clk_hw_get_parent(hw));
	parent = to_clk_omap_divider(parent_hw);

	/* Restore the dividers */
	if (!ret) {
		orig_v = ti_clk_ll_ops->clk_readl(&parent->reg);
		dummy_v = orig_v;

		/* Write any other value different from the Read value */
		dummy_v ^= (1 << parent->shift);
		ti_clk_ll_ops->clk_writel(dummy_v, &parent->reg);

		/* Write the original divider */
		ti_clk_ll_ops->clk_writel(orig_v, &parent->reg);
	}

	return ret;
}

static struct clk *_register_gate(struct device_node *node, const char *name,
				  const char *parent_name, unsigned long flags,
				  struct clk_omap_reg *reg, u8 bit_idx,
				  u8 clk_gate_flags, const struct clk_ops *ops,
				  const struct clk_hw_omap_ops *hw_ops)
{
	struct clk_init_data init = { NULL };
	struct clk_hw_omap *clk_hw;
	struct clk *clk;

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

	clk_hw->hw.init = &init;

	init.name = name;
	init.ops = ops;

	memcpy(&clk_hw->enable_reg, reg, sizeof(*reg));
	clk_hw->enable_bit = bit_idx;
	clk_hw->ops = hw_ops;

	clk_hw->flags = clk_gate_flags;

	init.parent_names = &parent_name;
	init.num_parents = 1;

	init.flags = flags;

	clk = of_ti_clk_register_omap_hw(node, &clk_hw->hw, name);

	if (IS_ERR(clk))
		kfree(clk_hw);

	return clk;
}

static void __init _of_ti_gate_clk_setup(struct device_node *node,
					 const struct clk_ops *ops,
					 const struct clk_hw_omap_ops *hw_ops)
{
	struct clk *clk;
	const char *parent_name;
	struct clk_omap_reg reg;
	const char *name;
	u8 enable_bit = 0;
	u32 val;
	u32 flags = 0;
	u8 clk_gate_flags = 0;

	if (ops != &omap_gate_clkdm_clk_ops) {
		if (ti_clk_get_reg_addr(node, 0, &reg))
			return;

		if (!of_property_read_u32(node, "ti,bit-shift", &val))
			enable_bit = val;
	}

	if (of_clk_get_parent_count(node) != 1) {
		pr_err("%pOFn must have 1 parent\n", node);
		return;
	}

	parent_name = of_clk_get_parent_name(node, 0);

	if (of_property_read_bool(node, "ti,set-rate-parent"))
		flags |= CLK_SET_RATE_PARENT;

	if (of_property_read_bool(node, "ti,set-bit-to-disable"))
		clk_gate_flags |= INVERT_ENABLE;

	name = ti_dt_clk_name(node);
	clk = _register_gate(node, name, parent_name, flags, &reg,
			     enable_bit, clk_gate_flags, ops, hw_ops);

	if (!IS_ERR(clk))
		of_clk_add_provider(node, of_clk_src_simple_get, clk);
}

static void __init
_of_ti_composite_gate_clk_setup(struct device_node *node,
				const struct clk_hw_omap_ops *hw_ops)
{
	struct clk_hw_omap *gate;
	u32 val = 0;

	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
	if (!gate)
		return;

	if (ti_clk_get_reg_addr(node, 0, &gate->enable_reg))
		goto cleanup;

	of_property_read_u32(node, "ti,bit-shift", &val);

	gate->enable_bit = val;
	gate->ops = hw_ops;

	if (!ti_clk_add_component(node, &gate->hw, CLK_COMPONENT_TYPE_GATE))
		return;

cleanup:
	kfree(gate);
}

static void __init
of_ti_composite_no_wait_gate_clk_setup(struct device_node *node)
{
	_of_ti_composite_gate_clk_setup(node, NULL);
}
CLK_OF_DECLARE(ti_composite_no_wait_gate_clk, "ti,composite-no-wait-gate-clock",
	       of_ti_composite_no_wait_gate_clk_setup);

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
static void __init of_ti_composite_interface_clk_setup(struct device_node *node)
{
	_of_ti_composite_gate_clk_setup(node, &clkhwops_iclk_wait);
}
CLK_OF_DECLARE(ti_composite_interface_clk, "ti,composite-interface-clock",
	       of_ti_composite_interface_clk_setup);
#endif

static void __init of_ti_composite_gate_clk_setup(struct device_node *node)
{
	_of_ti_composite_gate_clk_setup(node, &clkhwops_wait);
}
CLK_OF_DECLARE(ti_composite_gate_clk, "ti,composite-gate-clock",
	       of_ti_composite_gate_clk_setup);


static void __init of_ti_clkdm_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clkdm_clk_ops, NULL);
}
CLK_OF_DECLARE(ti_clkdm_gate_clk, "ti,clkdm-gate-clock",
	       of_ti_clkdm_gate_clk_setup);

static void __init of_ti_hsdiv_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clk_hsdiv_restore_ops,
			      &clkhwops_wait);
}
CLK_OF_DECLARE(ti_hsdiv_gate_clk, "ti,hsdiv-gate-clock",
	       of_ti_hsdiv_gate_clk_setup);

static void __init of_ti_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops, NULL);
}
CLK_OF_DECLARE(ti_gate_clk, "ti,gate-clock", of_ti_gate_clk_setup);

static void __init of_ti_wait_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops, &clkhwops_wait);
}
CLK_OF_DECLARE(ti_wait_gate_clk, "ti,wait-gate-clock",
	       of_ti_wait_gate_clk_setup);

#ifdef CONFIG_ARCH_OMAP3
static void __init of_ti_am35xx_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops,
			      &clkhwops_am35xx_ipss_module_wait);
}
CLK_OF_DECLARE(ti_am35xx_gate_clk, "ti,am35xx-gate-clock",
	       of_ti_am35xx_gate_clk_setup);

static void __init of_ti_dss_gate_clk_setup(struct device_node *node)
{
	_of_ti_gate_clk_setup(node, &omap_gate_clk_ops,
			      &clkhwops_omap3430es2_dss_usbhost_wait);
}
CLK_OF_DECLARE(ti_dss_gate_clk, "ti,dss-gate-clock",
	       of_ti_dss_gate_clk_setup);
#endif