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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 | |
| 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 | |
| 81 | static 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 | dev_set_drvdata(&pdev->dev, clkdata); |
| 99 | |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | static int twl6040_clk_remove(struct platform_device *pdev) |
| 104 | { |
| 105 | struct twl6040_clk *clkdata = dev_get_drvdata(&pdev->dev); |
| 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, |
| 118 | .remove = twl6040_clk_remove, |
| 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"); |
| 127 |
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