Commit | Line | Data |
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70ee6577 LW |
1 | /* |
2 | * Clock driver for the ARM Integrator/IM-PD1 board | |
3 | * Copyright (C) 2012 Linus Walleij | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | */ | |
9 | #include <linux/clk-provider.h> | |
10 | #include <linux/clk.h> | |
11 | #include <linux/clkdev.h> | |
12 | #include <linux/err.h> | |
13 | #include <linux/io.h> | |
14 | #include <linux/platform_data/clk-integrator.h> | |
15 | ||
16 | #include <mach/impd1.h> | |
17 | ||
18 | #include "clk-icst.h" | |
19 | ||
20 | struct impd1_clk { | |
21 | struct clk *vcoclk; | |
22 | struct clk *uartclk; | |
23 | struct clk_lookup *clks[3]; | |
24 | }; | |
25 | ||
26 | static struct impd1_clk impd1_clks[4]; | |
27 | ||
28 | /* | |
29 | * There are two VCO's on the IM-PD1 but only one is used by the | |
30 | * kernel, that is why we are only implementing the control of | |
31 | * IMPD1_OSC1 here. | |
32 | */ | |
33 | ||
34 | static const struct icst_params impd1_vco_params = { | |
35 | .ref = 24000000, /* 24 MHz */ | |
36 | .vco_max = ICST525_VCO_MAX_3V, | |
37 | .vco_min = ICST525_VCO_MIN, | |
38 | .vd_min = 12, | |
39 | .vd_max = 519, | |
40 | .rd_min = 3, | |
41 | .rd_max = 120, | |
42 | .s2div = icst525_s2div, | |
43 | .idx2s = icst525_idx2s, | |
44 | }; | |
45 | ||
46 | static const struct clk_icst_desc impd1_icst1_desc = { | |
47 | .params = &impd1_vco_params, | |
48 | .vco_offset = IMPD1_OSC1, | |
49 | .lock_offset = IMPD1_LOCK, | |
50 | }; | |
51 | ||
52 | /** | |
53 | * integrator_impd1_clk_init() - set up the integrator clock tree | |
54 | * @base: base address of the logic module (LM) | |
55 | * @id: the ID of this LM | |
56 | */ | |
57 | void integrator_impd1_clk_init(void __iomem *base, unsigned int id) | |
58 | { | |
59 | struct impd1_clk *imc; | |
60 | struct clk *clk; | |
61 | int i; | |
62 | ||
63 | if (id > 3) { | |
64 | pr_crit("no more than 4 LMs can be attached\n"); | |
65 | return; | |
66 | } | |
67 | imc = &impd1_clks[id]; | |
68 | ||
69 | clk = icst_clk_register(NULL, &impd1_icst1_desc, base); | |
70 | imc->vcoclk = clk; | |
71 | imc->clks[0] = clkdev_alloc(clk, NULL, "lm%x:01000", id); | |
72 | ||
73 | /* UART reference clock */ | |
74 | clk = clk_register_fixed_rate(NULL, "uartclk", NULL, CLK_IS_ROOT, | |
75 | 14745600); | |
76 | imc->uartclk = clk; | |
77 | imc->clks[1] = clkdev_alloc(clk, NULL, "lm%x:00100", id); | |
78 | imc->clks[2] = clkdev_alloc(clk, NULL, "lm%x:00200", id); | |
79 | ||
80 | for (i = 0; i < ARRAY_SIZE(imc->clks); i++) | |
81 | clkdev_add(imc->clks[i]); | |
82 | } | |
83 | ||
84 | void integrator_impd1_clk_exit(unsigned int id) | |
85 | { | |
86 | int i; | |
87 | struct impd1_clk *imc; | |
88 | ||
89 | if (id > 3) | |
90 | return; | |
91 | imc = &impd1_clks[id]; | |
92 | ||
93 | for (i = 0; i < ARRAY_SIZE(imc->clks); i++) | |
94 | clkdev_drop(imc->clks[i]); | |
95 | clk_unregister(imc->uartclk); | |
96 | clk_unregister(imc->vcoclk); | |
97 | } |