summaryrefslogtreecommitdiff
path: root/arch/arm/plat-spear/include/plat/clock.h
blob: 0062bafef12d2e9eb1a8b3eafe60e7aad4e13689 (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
/*
 * arch/arm/plat-spear/include/plat/clock.h
 *
 * Clock framework definitions for SPEAr platform
 *
 * Copyright (C) 2009 ST Microelectronics
 * Viresh Kumar<viresh.kumar@st.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#ifndef __PLAT_CLOCK_H
#define __PLAT_CLOCK_H

#include <linux/list.h>
#include <linux/clkdev.h>
#include <linux/types.h>

/* clk structure flags */
#define	ALWAYS_ENABLED		(1 << 0) /* clock always enabled */
#define	RESET_TO_ENABLE		(1 << 1) /* reset register bit to enable clk */
#define	ENABLED_ON_INIT		(1 << 2) /* clocks enabled at init */

/**
 * struct clkops - clock operations
 * @enable: pointer to clock enable function
 * @disable: pointer to clock disable function
 */
struct clkops {
	int (*enable) (struct clk *);
	void (*disable) (struct clk *);
};

/**
 * struct pclk_info - parents info
 * @pclk: pointer to parent clk
 * @pclk_val: value to be written for selecting this parent
 */
struct pclk_info {
	struct clk *pclk;
	u8 pclk_val;
};

/**
 * struct pclk_sel - parents selection configuration
 * @pclk_info: pointer to array of parent clock info
 * @pclk_count: number of parents
 * @pclk_sel_reg: register for selecting a parent
 * @pclk_sel_mask: mask for selecting parent (can be used to clear bits also)
 */
struct pclk_sel {
	struct pclk_info *pclk_info;
	u8 pclk_count;
	void __iomem *pclk_sel_reg;
	unsigned int pclk_sel_mask;
};

/**
 * struct rate_config - clk rate configurations
 * @tbls: array of device specific clk rate tables, in ascending order of rates
 * @count: size of tbls array
 * @default_index: default setting when originally disabled
 */
struct rate_config {
	void *tbls;
	u8 count;
	u8 default_index;
};

/**
 * struct clk - clock structure
 * @usage_count: num of users who enabled this clock
 * @flags: flags for clock properties
 * @rate: programmed clock rate in Hz
 * @en_reg: clk enable/disable reg
 * @en_reg_bit: clk enable/disable bit
 * @ops: clk enable/disable ops - generic_clkops selected if NULL
 * @recalc: pointer to clock rate recalculate function
 * @set_rate: pointer to clock set rate function
 * @calc_rate: pointer to clock get rate function for index
 * @rate_config: rate configuration information, used by set_rate
 * @div_factor: division factor to parent clock.
 * @pclk: current parent clk
 * @pclk_sel: pointer to parent selection structure
 * @pclk_sel_shift: register shift for selecting parent of this clock
 * @children: list for childrens or this clock
 * @sibling: node for list of clocks having same parents
 * @private_data: clock specific private data
 * @node: list to maintain clocks linearly
 * @cl: clocklook up associated with this clock
 * @dent: object for debugfs
 */
struct clk {
	unsigned int usage_count;
	unsigned int flags;
	unsigned long rate;
	void __iomem *en_reg;
	u8 en_reg_bit;
	const struct clkops *ops;
	int (*recalc) (struct clk *);
	int (*set_rate) (struct clk *, unsigned long rate);
	unsigned long (*calc_rate)(struct clk *, int index);
	struct rate_config rate_config;
	unsigned int div_factor;

	struct clk *pclk;
	struct pclk_sel *pclk_sel;
	unsigned int pclk_sel_shift;

	struct list_head children;
	struct list_head sibling;
	void *private_data;
#ifdef CONFIG_DEBUG_FS
	struct list_head node;
	struct clk_lookup *cl;
	struct dentry *dent;
#endif
};

/* pll configuration structure */
struct pll_clk_masks {
	u32 mode_mask;
	u32 mode_shift;

	u32 norm_fdbk_m_mask;
	u32 norm_fdbk_m_shift;
	u32 dith_fdbk_m_mask;
	u32 dith_fdbk_m_shift;
	u32 div_p_mask;
	u32 div_p_shift;
	u32 div_n_mask;
	u32 div_n_shift;
};

struct pll_clk_config {
	void __iomem *mode_reg;
	void __iomem *cfg_reg;
	struct pll_clk_masks *masks;
};

/* pll clk rate config structure */
struct pll_rate_tbl {
	u8 mode;
	u16 m;
	u8 n;
	u8 p;
};

/* ahb and apb bus configuration structure */
struct bus_clk_masks {
	u32 mask;
	u32 shift;
};

struct bus_clk_config {
	void __iomem *reg;
	struct bus_clk_masks *masks;
};

/* ahb and apb clk bus rate config structure */
struct bus_rate_tbl {
	u8 div;
};

/* Aux clk configuration structure: applicable to UART and FIRDA */
struct aux_clk_masks {
	u32 eq_sel_mask;
	u32 eq_sel_shift;
	u32 eq1_mask;
	u32 eq2_mask;
	u32 xscale_sel_mask;
	u32 xscale_sel_shift;
	u32 yscale_sel_mask;
	u32 yscale_sel_shift;
};

struct aux_clk_config {
	void __iomem *synth_reg;
	struct aux_clk_masks *masks;
};

/* aux clk rate config structure */
struct aux_rate_tbl {
	u16 xscale;
	u16 yscale;
	u8 eq;
};

/* GPT clk configuration structure */
struct gpt_clk_masks {
	u32 mscale_sel_mask;
	u32 mscale_sel_shift;
	u32 nscale_sel_mask;
	u32 nscale_sel_shift;
};

struct gpt_clk_config {
	void __iomem *synth_reg;
	struct gpt_clk_masks *masks;
};

/* gpt clk rate config structure */
struct gpt_rate_tbl {
	u16 mscale;
	u16 nscale;
};

/* clcd clk configuration structure */
struct clcd_synth_masks {
	u32 div_factor_mask;
	u32 div_factor_shift;
};

struct clcd_clk_config {
	void __iomem *synth_reg;
	struct clcd_synth_masks *masks;
};

/* clcd clk rate config structure */
struct clcd_rate_tbl {
	u16 div;
};

/* platform specific clock functions */
void __init clk_init(void);
void clk_register(struct clk_lookup *cl);
void recalc_root_clocks(void);

/* clock recalc & set rate functions */
int follow_parent(struct clk *clk);
unsigned long pll_calc_rate(struct clk *clk, int index);
int pll_clk_recalc(struct clk *clk);
int pll_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long bus_calc_rate(struct clk *clk, int index);
int bus_clk_recalc(struct clk *clk);
int bus_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long gpt_calc_rate(struct clk *clk, int index);
int gpt_clk_recalc(struct clk *clk);
int gpt_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long aux_calc_rate(struct clk *clk, int index);
int aux_clk_recalc(struct clk *clk);
int aux_clk_set_rate(struct clk *clk, unsigned long desired_rate);
unsigned long clcd_calc_rate(struct clk *clk, int index);
int clcd_clk_recalc(struct clk *clk);
int clcd_clk_set_rate(struct clk *clk, unsigned long desired_rate);

#endif /* __PLAT_CLOCK_H */