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f9f8c043 PU |
1 | /* |
2 | * TWL6040 clock module driver for OMAP4 McPDM functional clock | |
3 | * | |
4 | * Copyright (C) 2012 Texas Instruments Inc. | |
5 | * Peter Ujfalusi <peter.ujfalusi@ti.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License | |
9 | * version 2 as published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
19 | * 02110-1301 USA | |
20 | * | |
21 | */ | |
22 | ||
23 | #include <linux/clk.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/platform_device.h> | |
27 | #include <linux/mfd/twl6040.h> | |
28 | #include <linux/clk-provider.h> | |
29 | ||
30 | struct twl6040_clk { | |
31 | struct twl6040 *twl6040; | |
32 | struct device *dev; | |
33 | struct clk_hw mcpdm_fclk; | |
34 | struct clk *clk; | |
35 | int enabled; | |
36 | }; | |
37 | ||
38 | static int twl6040_bitclk_is_enabled(struct clk_hw *hw) | |
39 | { | |
40 | struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, | |
41 | mcpdm_fclk); | |
42 | return twl6040_clk->enabled; | |
43 | } | |
44 | ||
45 | static int twl6040_bitclk_prepare(struct clk_hw *hw) | |
46 | { | |
47 | struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, | |
48 | mcpdm_fclk); | |
49 | int ret; | |
50 | ||
51 | ret = twl6040_power(twl6040_clk->twl6040, 1); | |
52 | if (!ret) | |
53 | twl6040_clk->enabled = 1; | |
54 | ||
55 | return ret; | |
56 | } | |
57 | ||
58 | static void twl6040_bitclk_unprepare(struct clk_hw *hw) | |
59 | { | |
60 | struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk, | |
61 | mcpdm_fclk); | |
62 | int ret; | |
63 | ||
64 | ret = twl6040_power(twl6040_clk->twl6040, 0); | |
65 | if (!ret) | |
66 | twl6040_clk->enabled = 0; | |
67 | } | |
68 | ||
69 | static const struct clk_ops twl6040_mcpdm_ops = { | |
70 | .is_enabled = twl6040_bitclk_is_enabled, | |
71 | .prepare = twl6040_bitclk_prepare, | |
72 | .unprepare = twl6040_bitclk_unprepare, | |
73 | }; | |
74 | ||
75 | static struct clk_init_data wm831x_clkout_init = { | |
76 | .name = "mcpdm_fclk", | |
77 | .ops = &twl6040_mcpdm_ops, | |
78 | .flags = CLK_IS_ROOT, | |
79 | }; | |
80 | ||
0fe763c5 | 81 | static int twl6040_clk_probe(struct platform_device *pdev) |
f9f8c043 PU |
82 | { |
83 | struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent); | |
84 | struct twl6040_clk *clkdata; | |
85 | ||
86 | clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL); | |
87 | if (!clkdata) | |
88 | return -ENOMEM; | |
89 | ||
90 | clkdata->dev = &pdev->dev; | |
91 | clkdata->twl6040 = twl6040; | |
92 | ||
93 | clkdata->mcpdm_fclk.init = &wm831x_clkout_init; | |
94 | clkdata->clk = clk_register(&pdev->dev, &clkdata->mcpdm_fclk); | |
ddc07ef9 WY |
95 | if (IS_ERR(clkdata->clk)) |
96 | return PTR_ERR(clkdata->clk); | |
f9f8c043 | 97 | |
c0431037 | 98 | platform_set_drvdata(pdev, clkdata); |
f9f8c043 PU |
99 | |
100 | return 0; | |
101 | } | |
102 | ||
0fe763c5 | 103 | static int twl6040_clk_remove(struct platform_device *pdev) |
f9f8c043 | 104 | { |
c0431037 | 105 | struct twl6040_clk *clkdata = platform_get_drvdata(pdev); |
f9f8c043 PU |
106 | |
107 | clk_unregister(clkdata->clk); | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static struct platform_driver twl6040_clk_driver = { | |
113 | .driver = { | |
114 | .name = "twl6040-clk", | |
115 | .owner = THIS_MODULE, | |
116 | }, | |
117 | .probe = twl6040_clk_probe, | |
0fe763c5 | 118 | .remove = twl6040_clk_remove, |
f9f8c043 PU |
119 | }; |
120 | ||
121 | module_platform_driver(twl6040_clk_driver); | |
122 | ||
123 | MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock"); | |
124 | MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>"); | |
125 | MODULE_ALIAS("platform:twl6040-clk"); | |
126 | MODULE_LICENSE("GPL"); |