Commit | Line | Data |
---|---|---|
aa9ad6ad HW |
1 | /* linux/arch/arm/plat-samsung/include/plat/clock-clksrc.h |
2 | * | |
3 | * Parts taken from arch/arm/plat-s3c64xx/clock.c | |
4 | * Copyright 2008 Openmoko, Inc. | |
5 | * Copyright 2008 Simtec Electronics | |
6 | * Ben Dooks <ben@simtec.co.uk> | |
7 | * http://armlinux.simtec.co.uk/ | |
8 | * | |
9 | * Copyright 2009 Ben Dooks <ben-linux@fluff.org> | |
10 | * Copyright 2009 Harald Welte | |
11 | * | |
12 | * This program is free software; you can redistribute it and/or modify | |
13 | * it under the terms of the GNU General Public License version 2 as | |
14 | * published by the Free Software Foundation. | |
15 | */ | |
16 | ||
17 | /** | |
18 | * struct clksrc_sources - list of sources for a given clock | |
19 | * @sources: array of pointers to clocks | |
20 | * @nr_sources: The size of @sources | |
21 | */ | |
22 | struct clksrc_sources { | |
23 | unsigned int nr_sources; | |
24 | struct clk **sources; | |
25 | }; | |
26 | ||
27 | /** | |
28 | * struct clksrc_reg - register definition for clock control bits | |
29 | * @reg: pointer to the register in virtual memory. | |
30 | * @shift: the shift in bits to where the bitfield is. | |
31 | * @size: the size in bits of the bitfield. | |
32 | * | |
33 | * This specifies the size and position of the bits we are interested | |
34 | * in within the register specified by @reg. | |
35 | */ | |
36 | struct clksrc_reg { | |
37 | void __iomem *reg; | |
38 | unsigned short shift; | |
39 | unsigned short size; | |
40 | }; | |
41 | ||
42 | /** | |
43 | * struct clksrc_clk - class of clock for newer style samsung devices. | |
44 | * @clk: the standard clock representation | |
45 | * @sources: the sources for this clock | |
46 | * @reg_src: the register definition for selecting the clock's source | |
47 | * @reg_div: the register definition for the clock's output divisor | |
48 | * | |
49 | * This clock implements the features required by the newer SoCs where | |
50 | * the standard clock block provides an input mux and a post-mux divisor | |
51 | * to provide the periperhal's clock. | |
52 | * | |
53 | * The array of @sources provides the mapping of mux position to the | |
54 | * clock, and @reg_src shows the code where to modify to change the mux | |
55 | * position. The @reg_div defines how to change the divider settings on | |
56 | * the output. | |
57 | */ | |
58 | struct clksrc_clk { | |
59 | struct clk clk; | |
60 | struct clksrc_sources *sources; | |
61 | ||
62 | struct clksrc_reg reg_src; | |
63 | struct clksrc_reg reg_div; | |
64 | }; | |
65 | ||
682e2b7d BD |
66 | /** |
67 | * s3c_set_clksrc() - setup the clock from the register settings | |
68 | * @clk: The clock to setup. | |
69 | * @announce: true to announce the setting to printk(). | |
70 | * | |
71 | * Setup the clock from the current register settings, for when the | |
72 | * kernel boots or if it is resuming from a possibly unknown state. | |
73 | */ | |
74 | extern void s3c_set_clksrc(struct clksrc_clk *clk, bool announce); | |
aa9ad6ad HW |
75 | |
76 | /** | |
77 | * s3c_register_clksrc() register clocks from an array of clksrc clocks | |
78 | * @srcs: The array of clocks to register | |
79 | * @size: The size of the @srcs array. | |
80 | * | |
81 | * Initialise and register the array of clocks described by @srcs. | |
82 | */ | |
83 | extern void s3c_register_clksrc(struct clksrc_clk *srcs, int size); |