[go: nahoru, domu]
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
30struct 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
38static 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
45static 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
58static 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
69static 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
75static struct clk_init_data wm831x_clkout_init = {
76	.name = "mcpdm_fclk",
77	.ops = &twl6040_mcpdm_ops,
78	.flags = CLK_IS_ROOT,
79};
80
81static int twl6040_clk_probe(struct platform_device *pdev)
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);
95	if (IS_ERR(clkdata->clk))
96		return PTR_ERR(clkdata->clk);
97
98	platform_set_drvdata(pdev, clkdata);
99
100	return 0;
101}
102
103static int twl6040_clk_remove(struct platform_device *pdev)
104{
105	struct twl6040_clk *clkdata = platform_get_drvdata(pdev);
106
107	clk_unregister(clkdata->clk);
108
109	return 0;
110}
111
112static struct platform_driver twl6040_clk_driver = {
113	.driver = {
114		.name = "twl6040-clk",
115	},
116	.probe = twl6040_clk_probe,
117	.remove = twl6040_clk_remove,
118};
119
120module_platform_driver(twl6040_clk_driver);
121
122MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
123MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
124MODULE_ALIAS("platform:twl6040-clk");
125MODULE_LICENSE("GPL");
126