linux/drivers/clk/clk-twl6040.c
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   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                .owner = THIS_MODULE,
 116        },
 117        .probe = twl6040_clk_probe,
 118        .remove = twl6040_clk_remove,
 119};
 120
 121module_platform_driver(twl6040_clk_driver);
 122
 123MODULE_DESCRIPTION("TWL6040 clock driver for McPDM functional clock");
 124MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
 125MODULE_ALIAS("platform:twl6040-clk");
 126MODULE_LICENSE("GPL");
 127
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