projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| cd8fff50 MR |
2 | /* |
| 3 | * Copyright (C) 2016 Free Electrons | |
| 4 | * | |
| 5 | * Maxime Ripard <maxime.ripard@free-electrons.com> | |
| cd8fff50 MR |
6 | */ |
| 7 | ||
| 8 | #include <linux/clk.h> | |
| 9 | #include <linux/component.h> | |
| 10 | #include <linux/module.h> | |
| ac316725 | 11 | #include <linux/mod_devicetable.h> |
| cd8fff50 MR |
12 | #include <linux/platform_device.h> |
| 13 | #include <linux/regmap.h> | |
| 14 | #include <linux/reset.h> | |
| 15 | ||
| 16 | struct sun6i_drc { | |
| 17 | struct clk *bus_clk; | |
| 18 | struct clk *mod_clk; | |
| 19 | struct reset_control *reset; | |
| 20 | }; | |
| 21 | ||
| 22 | static int sun6i_drc_bind(struct device *dev, struct device *master, | |
| 23 | void *data) | |
| 24 | { | |
| 25 | struct sun6i_drc *drc; | |
| 26 | int ret; | |
| 27 | ||
| 28 | drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL); | |
| 29 | if (!drc) | |
| 30 | return -ENOMEM; | |
| 31 | dev_set_drvdata(dev, drc); | |
| 32 | ||
| 33 | drc->reset = devm_reset_control_get(dev, NULL); | |
| 34 | if (IS_ERR(drc->reset)) { | |
| 35 | dev_err(dev, "Couldn't get our reset line\n"); | |
| 36 | return PTR_ERR(drc->reset); | |
| 37 | } | |
| 38 | ||
| 39 | ret = reset_control_deassert(drc->reset); | |
| 40 | if (ret) { | |
| 41 | dev_err(dev, "Couldn't deassert our reset line\n"); | |
| 42 | return ret; | |
| 43 | } | |
| 44 | ||
| 45 | drc->bus_clk = devm_clk_get(dev, "ahb"); | |
| 46 | if (IS_ERR(drc->bus_clk)) { | |
| 47 | dev_err(dev, "Couldn't get our bus clock\n"); | |
| 48 | ret = PTR_ERR(drc->bus_clk); | |
| 49 | goto err_assert_reset; | |
| 50 | } | |
| 51 | clk_prepare_enable(drc->bus_clk); | |
| 52 | ||
| 53 | drc->mod_clk = devm_clk_get(dev, "mod"); | |
| 54 | if (IS_ERR(drc->mod_clk)) { | |
| 55 | dev_err(dev, "Couldn't get our mod clock\n"); | |
| 56 | ret = PTR_ERR(drc->mod_clk); | |
| 57 | goto err_disable_bus_clk; | |
| 58 | } | |
| 6fe082b0 MR |
59 | |
| 60 | ret = clk_set_rate_exclusive(drc->mod_clk, 300000000); | |
| 61 | if (ret) { | |
| 62 | dev_err(dev, "Couldn't set the module clock frequency\n"); | |
| 63 | goto err_disable_bus_clk; | |
| 64 | } | |
| 65 | ||
| cd8fff50 MR |
66 | clk_prepare_enable(drc->mod_clk); |
| 67 | ||
| 68 | return 0; | |
| 69 | ||
| 70 | err_disable_bus_clk: | |
| 71 | clk_disable_unprepare(drc->bus_clk); | |
| 72 | err_assert_reset: | |
| 73 | reset_control_assert(drc->reset); | |
| 74 | return ret; | |
| 75 | } | |
| 76 | ||
| 77 | static void sun6i_drc_unbind(struct device *dev, struct device *master, | |
| 78 | void *data) | |
| 79 | { | |
| 80 | struct sun6i_drc *drc = dev_get_drvdata(dev); | |
| 81 | ||
| 6fe082b0 | 82 | clk_rate_exclusive_put(drc->mod_clk); |
| cd8fff50 MR |
83 | clk_disable_unprepare(drc->mod_clk); |
| 84 | clk_disable_unprepare(drc->bus_clk); | |
| 85 | reset_control_assert(drc->reset); | |
| 86 | } | |
| 87 | ||
| dfeb693d | 88 | static const struct component_ops sun6i_drc_ops = { |
| cd8fff50 MR |
89 | .bind = sun6i_drc_bind, |
| 90 | .unbind = sun6i_drc_unbind, | |
| 91 | }; | |
| 92 | ||
| 93 | static int sun6i_drc_probe(struct platform_device *pdev) | |
| 94 | { | |
| 95 | return component_add(&pdev->dev, &sun6i_drc_ops); | |
| 96 | } | |
| 97 | ||
| 98 | static int sun6i_drc_remove(struct platform_device *pdev) | |
| 99 | { | |
| 100 | component_del(&pdev->dev, &sun6i_drc_ops); | |
| 101 | ||
| 102 | return 0; | |
| 103 | } | |
| 104 | ||
| 105 | static const struct of_device_id sun6i_drc_of_table[] = { | |
| b3e0b2db CYT |
106 | { .compatible = "allwinner,sun6i-a31-drc" }, |
| 107 | { .compatible = "allwinner,sun6i-a31s-drc" }, | |
| d0ec0a3e | 108 | { .compatible = "allwinner,sun8i-a23-drc" }, |
| cd8fff50 | 109 | { .compatible = "allwinner,sun8i-a33-drc" }, |
| 33478959 | 110 | { .compatible = "allwinner,sun9i-a80-drc" }, |
| cd8fff50 MR |
111 | { } |
| 112 | }; | |
| 113 | MODULE_DEVICE_TABLE(of, sun6i_drc_of_table); | |
| 114 | ||
| 115 | static struct platform_driver sun6i_drc_platform_driver = { | |
| 116 | .probe = sun6i_drc_probe, | |
| 117 | .remove = sun6i_drc_remove, | |
| 118 | .driver = { | |
| 119 | .name = "sun6i-drc", | |
| 120 | .of_match_table = sun6i_drc_of_table, | |
| 121 | }, | |
| 122 | }; | |
| 123 | module_platform_driver(sun6i_drc_platform_driver); | |
| 124 | ||
| 125 | MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); | |
| 126 | MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver"); | |
| 127 | MODULE_LICENSE("GPL"); |