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/module.h>
 24#include <linux/slab.h>
 25#include <linux/platform_device.h>
 26#include <linux/mfd/twl6040.h>
 27#include <linux/clk-provider.h>
 28
 29struct twl6040_clk {
 30	struct twl6040 *twl6040;
 31	struct device *dev;
 32	struct clk_hw mcpdm_fclk;
 33	struct clk *clk;
 34	int enabled;
 35};
 36
 37static int twl6040_bitclk_is_enabled(struct clk_hw *hw)
 38{
 39	struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
 40						       mcpdm_fclk);
 41	return twl6040_clk->enabled;
 42}
 43
 44static int twl6040_bitclk_prepare(struct clk_hw *hw)
 45{
 46	struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
 47						       mcpdm_fclk);
 48	int ret;
 49
 50	ret = twl6040_power(twl6040_clk->twl6040, 1);
 51	if (!ret)
 52		twl6040_clk->enabled = 1;
 53
 54	return ret;
 55}
 56
 57static void twl6040_bitclk_unprepare(struct clk_hw *hw)
 58{
 59	struct twl6040_clk *twl6040_clk = container_of(hw, struct twl6040_clk,
 60						       mcpdm_fclk);
 61	int ret;
 62
 63	ret = twl6040_power(twl6040_clk->twl6040, 0);
 64	if (!ret)
 65		twl6040_clk->enabled = 0;
 66}
 67
 68static const struct clk_ops twl6040_mcpdm_ops = {
 69	.is_enabled = twl6040_bitclk_is_enabled,
 70	.prepare = twl6040_bitclk_prepare,
 71	.unprepare = twl6040_bitclk_unprepare,
 72};
 73
 74static struct clk_init_data wm831x_clkout_init = {
 75	.name = "mcpdm_fclk",
 76	.ops = &twl6040_mcpdm_ops,
 77	.flags = CLK_IS_ROOT,
 78};
 79
 80static int twl6040_clk_probe(struct platform_device *pdev)
 81{
 82	struct twl6040 *twl6040 = dev_get_drvdata(pdev->dev.parent);
 83	struct twl6040_clk *clkdata;
 84
 85	clkdata = devm_kzalloc(&pdev->dev, sizeof(*clkdata), GFP_KERNEL);
 86	if (!clkdata)
 87		return -ENOMEM;
 88
 89	clkdata->dev = &pdev->dev;
 90	clkdata->twl6040 = twl6040;
 91
 92	clkdata->mcpdm_fclk.init = &wm831x_clkout_init;
 93	clkdata->clk = devm_clk_register(&pdev->dev, &clkdata->mcpdm_fclk);
 94	if (IS_ERR(clkdata->clk))
 95		return PTR_ERR(clkdata->clk);
 96
 97	platform_set_drvdata(pdev, clkdata);
 98
 99	return 0;
100}
101
102static struct platform_driver twl6040_clk_driver = {
103	.driver = {
104		.name = "twl6040-clk",
105	},
106	.probe = twl6040_clk_probe,
107};
108
109module_platform_driver(twl6040_clk_driver);
110
111MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
112MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
113MODULE_ALIAS("platform:twl6040-clk");
114MODULE_LICENSE("GPL");