/* * clk-max77686.c - Clock driver for Maxim 77686 * * Copyright (C) 2012 Samsung Electornics * Jonghwa Lee <jonghwa3.lee@samsung.com> * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #include <linux/kernel.h> #include <linux/slab.h> #include <linux/err.h> #include <linux/platform_device.h> #include <linux/mfd/max77686.h> #include <linux/mfd/max77686-private.h> #include <linux/clk-provider.h> #include <linux/mutex.h> #include <linux/clkdev.h> enum { MAX77686_CLK_AP = 0, MAX77686_CLK_CP, MAX77686_CLK_PMIC, MAX77686_CLKS_NUM, }; struct max77686_clk { struct max77686_dev *iodev; u32 mask; struct clk_hw hw; struct clk_lookup *lookup; }; static struct max77686_clk *to_max77686_clk(struct clk_hw *hw) { return container_of(hw, struct max77686_clk, hw); } static int max77686_clk_prepare(struct clk_hw *hw) { struct max77686_clk *max77686 = to_max77686_clk(hw); return regmap_update_bits(max77686->iodev->regmap, MAX77686_REG_32KHZ, max77686->mask, max77686->mask); } static void max77686_clk_unprepare(struct clk_hw *hw) { struct max77686_clk *max77686 = to_max77686_clk(hw); regmap_update_bits(max77686->iodev->regmap, MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask); } static int max77686_clk_is_enabled(struct clk_hw *hw) { struct max77686_clk *max77686 = to_max77686_clk(hw); int ret; u32 val; ret = regmap_read(max77686->iodev->regmap, MAX77686_REG_32KHZ, &val); if (ret < 0) return -EINVAL; return val & max77686->mask; } static struct clk_ops max77686_clk_ops = { .prepare = max77686_clk_prepare, .unprepare = max77686_clk_unprepare, .is_enabled = max77686_clk_is_enabled, }; static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = { [MAX77686_CLK_AP] = { .name = "32khz_ap", .ops = &max77686_clk_ops, .flags = CLK_IS_ROOT, }, [MAX77686_CLK_CP] = { .name = "32khz_cp", .ops = &max77686_clk_ops, .flags = CLK_IS_ROOT, }, [MAX77686_CLK_PMIC] = { .name = "32khz_pmic", .ops = &max77686_clk_ops, .flags = CLK_IS_ROOT, }, }; static int max77686_clk_register(struct device *dev, struct max77686_clk *max77686) { struct clk *clk; struct clk_hw *hw = &max77686->hw; clk = clk_register(dev, hw); if (IS_ERR(clk)) return -ENOMEM; max77686->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL); if (!max77686->lookup) return -ENOMEM; max77686->lookup->con_id = hw->init->name; max77686->lookup->clk = clk; clkdev_add(max77686->lookup); return 0; } static int max77686_clk_probe(struct platform_device *pdev) { struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent); struct max77686_clk **max77686_clks; int i, ret; max77686_clks = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk *) * MAX77686_CLKS_NUM, GFP_KERNEL); if (!max77686_clks) return -ENOMEM; for (i = 0; i < MAX77686_CLKS_NUM; i++) { max77686_clks[i] = devm_kzalloc(&pdev->dev, sizeof(struct max77686_clk), GFP_KERNEL); if (!max77686_clks[i]) return -ENOMEM; } for (i = 0; i < MAX77686_CLKS_NUM; i++) { max77686_clks[i]->iodev = iodev; max77686_clks[i]->mask = 1 << i; max77686_clks[i]->hw.init = &max77686_clks_init[i]; ret = max77686_clk_register(&pdev->dev, max77686_clks[i]); if (ret) { switch (i) { case MAX77686_CLK_AP: dev_err(&pdev->dev, "Fail to register CLK_AP\n"); goto err_clk_ap; break; case MAX77686_CLK_CP: dev_err(&pdev->dev, "Fail to register CLK_CP\n"); goto err_clk_cp; break; case MAX77686_CLK_PMIC: dev_err(&pdev->dev, "Fail to register CLK_PMIC\n"); goto err_clk_pmic; } } } platform_set_drvdata(pdev, max77686_clks); goto out; err_clk_pmic: clkdev_drop(max77686_clks[MAX77686_CLK_CP]->lookup); kfree(max77686_clks[MAX77686_CLK_CP]->hw.clk); err_clk_cp: clkdev_drop(max77686_clks[MAX77686_CLK_AP]->lookup); kfree(max77686_clks[MAX77686_CLK_AP]->hw.clk); err_clk_ap: out: return ret; } static int max77686_clk_remove(struct platform_device *pdev) { struct max77686_clk **max77686_clks = platform_get_drvdata(pdev); int i; for (i = 0; i < MAX77686_CLKS_NUM; i++) { clkdev_drop(max77686_clks[i]->lookup); kfree(max77686_clks[i]->hw.clk); } return 0; } static const struct platform_device_id max77686_clk_id[] = { { "max77686-clk", 0}, { }, }; MODULE_DEVICE_TABLE(platform, max77686_clk_id); static struct platform_driver max77686_clk_driver = { .driver = { .name = "max77686-clk", .owner = THIS_MODULE, }, .probe = max77686_clk_probe, .remove = max77686_clk_remove, .id_table = max77686_clk_id, }; static int __init max77686_clk_init(void) { return platform_driver_register(&max77686_clk_driver); } subsys_initcall(max77686_clk_init); static void __init max77686_clk_cleanup(void) { platform_driver_unregister(&max77686_clk_driver); } module_exit(max77686_clk_cleanup); MODULE_DESCRIPTION("MAXIM 77686 Clock Driver"); MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>"); MODULE_LICENSE("GPL");