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8c0236fc VK |
1 | /* |
2 | * arch/arm/plat-spear/include/plat/clock.h | |
3 | * | |
4 | * Clock framework definitions for SPEAr platform | |
5 | * | |
6 | * Copyright (C) 2009 ST Microelectronics | |
7 | * Viresh Kumar<viresh.kumar@st.com> | |
8 | * | |
9 | * This file is licensed under the terms of the GNU General Public | |
10 | * License version 2. This program is licensed "as is" without any | |
11 | * warranty of any kind, whether express or implied. | |
12 | */ | |
13 | ||
14 | #ifndef __PLAT_CLOCK_H | |
15 | #define __PLAT_CLOCK_H | |
16 | ||
17 | #include <linux/list.h> | |
6d803ba7 | 18 | #include <linux/clkdev.h> |
8c0236fc VK |
19 | #include <linux/types.h> |
20 | ||
21 | /* clk structure flags */ | |
22 | #define ALWAYS_ENABLED (1 << 0) /* clock always enabled */ | |
23 | #define RESET_TO_ENABLE (1 << 1) /* reset register bit to enable clk */ | |
24 | ||
25 | /** | |
26 | * struct clkops - clock operations | |
27 | * @enable: pointer to clock enable function | |
28 | * @disable: pointer to clock disable function | |
29 | */ | |
30 | struct clkops { | |
31 | int (*enable) (struct clk *); | |
32 | void (*disable) (struct clk *); | |
33 | }; | |
34 | ||
35 | /** | |
36 | * struct pclk_info - parents info | |
37 | * @pclk: pointer to parent clk | |
38 | * @pclk_mask: value to be written for selecting this parent | |
39 | * @scalable: Is parent scalable (1 - YES, 0 - NO) | |
40 | */ | |
41 | struct pclk_info { | |
42 | struct clk *pclk; | |
43 | u8 pclk_mask; | |
44 | u8 scalable; | |
45 | }; | |
46 | ||
47 | /** | |
48 | * struct pclk_sel - parents selection configuration | |
49 | * @pclk_info: pointer to array of parent clock info | |
50 | * @pclk_count: number of parents | |
51 | * @pclk_sel_reg: register for selecting a parent | |
52 | * @pclk_sel_mask: mask for selecting parent (can be used to clear bits also) | |
53 | */ | |
54 | struct pclk_sel { | |
55 | struct pclk_info *pclk_info; | |
56 | u8 pclk_count; | |
57 | unsigned int *pclk_sel_reg; | |
58 | unsigned int pclk_sel_mask; | |
59 | }; | |
60 | ||
61 | /** | |
62 | * struct clk - clock structure | |
63 | * @usage_count: num of users who enabled this clock | |
64 | * @flags: flags for clock properties | |
65 | * @rate: programmed clock rate in Hz | |
66 | * @en_reg: clk enable/disable reg | |
67 | * @en_reg_bit: clk enable/disable bit | |
68 | * @ops: clk enable/disable ops - generic_clkops selected if NULL | |
69 | * @recalc: pointer to clock rate recalculate function | |
70 | * @pclk: current parent clk | |
71 | * @pclk_sel: pointer to parent selection structure | |
72 | * @pclk_sel_shift: register shift for selecting parent of this clock | |
73 | * @children: list for childrens or this clock | |
74 | * @sibling: node for list of clocks having same parents | |
75 | * @private_data: clock specific private data | |
76 | */ | |
77 | struct clk { | |
78 | unsigned int usage_count; | |
79 | unsigned int flags; | |
80 | unsigned long rate; | |
81 | unsigned int *en_reg; | |
82 | u8 en_reg_bit; | |
83 | const struct clkops *ops; | |
84 | void (*recalc) (struct clk *); | |
85 | ||
86 | struct clk *pclk; | |
87 | struct pclk_sel *pclk_sel; | |
88 | unsigned int pclk_sel_shift; | |
89 | ||
90 | struct list_head children; | |
91 | struct list_head sibling; | |
92 | void *private_data; | |
93 | }; | |
94 | ||
95 | /* pll configuration structure */ | |
96 | struct pll_clk_config { | |
97 | unsigned int *mode_reg; | |
98 | unsigned int *cfg_reg; | |
99 | }; | |
100 | ||
101 | /* ahb and apb bus configuration structure */ | |
102 | struct bus_clk_config { | |
103 | unsigned int *reg; | |
104 | unsigned int mask; | |
105 | unsigned int shift; | |
106 | }; | |
107 | ||
108 | /* | |
109 | * Aux clk configuration structure: applicable to GPT, UART and FIRDA | |
110 | */ | |
111 | struct aux_clk_config { | |
112 | unsigned int *synth_reg; | |
113 | }; | |
114 | ||
115 | /* platform specific clock functions */ | |
116 | void clk_register(struct clk_lookup *cl); | |
117 | void recalc_root_clocks(void); | |
118 | ||
119 | /* clock recalc functions */ | |
120 | void follow_parent(struct clk *clk); | |
121 | void pll1_clk_recalc(struct clk *clk); | |
122 | void bus_clk_recalc(struct clk *clk); | |
123 | void gpt_clk_recalc(struct clk *clk); | |
124 | void aux_clk_recalc(struct clk *clk); | |
125 | ||
126 | #endif /* __PLAT_CLOCK_H */ |