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- /*
- * clk-s2mps11.c - Clock driver for S2MPS11.
- *
- * Copyright (C) 2013,2014 Samsung Electornics
- *
- * 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.
- *
- */
- #include <linux/module.h>
- #include <linux/err.h>
- #include <linux/of.h>
- #include <linux/clkdev.h>
- #include <linux/regmap.h>
- #include <linux/clk-provider.h>
- #include <linux/platform_device.h>
- #include <linux/mfd/samsung/s2mps11.h>
- #include <linux/mfd/samsung/s2mps13.h>
- #include <linux/mfd/samsung/s2mps14.h>
- #include <linux/mfd/samsung/s5m8767.h>
- #include <linux/mfd/samsung/core.h>
- #define s2mps11_name(a) (a->hw.init->name)
- static struct clk **clk_table;
- static struct clk_onecell_data clk_data;
- enum {
- S2MPS11_CLK_AP = 0,
- S2MPS11_CLK_CP,
- S2MPS11_CLK_BT,
- S2MPS11_CLKS_NUM,
- };
- struct s2mps11_clk {
- struct sec_pmic_dev *iodev;
- struct device_node *clk_np;
- struct clk_hw hw;
- struct clk *clk;
- struct clk_lookup *lookup;
- u32 mask;
- unsigned int reg;
- };
- static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
- {
- return container_of(hw, struct s2mps11_clk, hw);
- }
- static int s2mps11_clk_prepare(struct clk_hw *hw)
- {
- struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
- return regmap_update_bits(s2mps11->iodev->regmap_pmic,
- s2mps11->reg,
- s2mps11->mask, s2mps11->mask);
- }
- static void s2mps11_clk_unprepare(struct clk_hw *hw)
- {
- struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
- regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
- s2mps11->mask, ~s2mps11->mask);
- }
- static int s2mps11_clk_is_prepared(struct clk_hw *hw)
- {
- int ret;
- u32 val;
- struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
- ret = regmap_read(s2mps11->iodev->regmap_pmic,
- s2mps11->reg, &val);
- if (ret < 0)
- return -EINVAL;
- return val & s2mps11->mask;
- }
- static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
- unsigned long parent_rate)
- {
- return 32768;
- }
- static struct clk_ops s2mps11_clk_ops = {
- .prepare = s2mps11_clk_prepare,
- .unprepare = s2mps11_clk_unprepare,
- .is_prepared = s2mps11_clk_is_prepared,
- .recalc_rate = s2mps11_clk_recalc_rate,
- };
- static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
- [S2MPS11_CLK_AP] = {
- .name = "s2mps11_ap",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- [S2MPS11_CLK_CP] = {
- .name = "s2mps11_cp",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- [S2MPS11_CLK_BT] = {
- .name = "s2mps11_bt",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- };
- static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = {
- [S2MPS11_CLK_AP] = {
- .name = "s2mps13_ap",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- [S2MPS11_CLK_CP] = {
- .name = "s2mps13_cp",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- [S2MPS11_CLK_BT] = {
- .name = "s2mps13_bt",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- };
- static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
- [S2MPS11_CLK_AP] = {
- .name = "s2mps14_ap",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- [S2MPS11_CLK_BT] = {
- .name = "s2mps14_bt",
- .ops = &s2mps11_clk_ops,
- .flags = CLK_IS_ROOT,
- },
- };
- static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
- struct clk_init_data *clks_init)
- {
- struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
- struct device_node *clk_np;
- int i;
- if (!iodev->dev->of_node)
- return ERR_PTR(-EINVAL);
- clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
- if (!clk_np) {
- dev_err(&pdev->dev, "could not find clock sub-node\n");
- return ERR_PTR(-EINVAL);
- }
- for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
- if (!clks_init[i].name)
- continue; /* Skip clocks not present in some devices */
- of_property_read_string_index(clk_np, "clock-output-names", i,
- &clks_init[i].name);
- }
- return clk_np;
- }
- static int s2mps11_clk_probe(struct platform_device *pdev)
- {
- struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
- struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
- unsigned int s2mps11_reg;
- struct clk_init_data *clks_init;
- int i, ret = 0;
- s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
- sizeof(*s2mps11_clk), GFP_KERNEL);
- if (!s2mps11_clks)
- return -ENOMEM;
- s2mps11_clk = s2mps11_clks;
- clk_table = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
- sizeof(struct clk *), GFP_KERNEL);
- if (!clk_table)
- return -ENOMEM;
- switch(platform_get_device_id(pdev)->driver_data) {
- case S2MPS11X:
- s2mps11_reg = S2MPS11_REG_RTC_CTRL;
- clks_init = s2mps11_clks_init;
- break;
- case S2MPS13X:
- s2mps11_reg = S2MPS13_REG_RTCCTRL;
- clks_init = s2mps13_clks_init;
- break;
- case S2MPS14X:
- s2mps11_reg = S2MPS14_REG_RTCCTRL;
- clks_init = s2mps14_clks_init;
- break;
- case S5M8767X:
- s2mps11_reg = S5M8767_REG_CTRL1;
- clks_init = s2mps11_clks_init;
- break;
- default:
- dev_err(&pdev->dev, "Invalid device type\n");
- return -EINVAL;
- }
- /* Store clocks of_node in first element of s2mps11_clks array */
- s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init);
- if (IS_ERR(s2mps11_clks->clk_np))
- return PTR_ERR(s2mps11_clks->clk_np);
- for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
- if (!clks_init[i].name)
- continue; /* Skip clocks not present in some devices */
- s2mps11_clk->iodev = iodev;
- s2mps11_clk->hw.init = &clks_init[i];
- s2mps11_clk->mask = 1 << i;
- s2mps11_clk->reg = s2mps11_reg;
- s2mps11_clk->clk = devm_clk_register(&pdev->dev,
- &s2mps11_clk->hw);
- if (IS_ERR(s2mps11_clk->clk)) {
- dev_err(&pdev->dev, "Fail to register : %s\n",
- s2mps11_name(s2mps11_clk));
- ret = PTR_ERR(s2mps11_clk->clk);
- goto err_reg;
- }
- s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk,
- s2mps11_name(s2mps11_clk), NULL);
- if (!s2mps11_clk->lookup) {
- ret = -ENOMEM;
- goto err_reg;
- }
- }
- for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
- /* Skip clocks not present on S2MPS14 */
- if (!clks_init[i].name)
- continue;
- clk_table[i] = s2mps11_clks[i].clk;
- }
- clk_data.clks = clk_table;
- clk_data.clk_num = S2MPS11_CLKS_NUM;
- of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
- &clk_data);
- platform_set_drvdata(pdev, s2mps11_clks);
- return ret;
- err_reg:
- while (--i >= 0)
- clkdev_drop(s2mps11_clks[i].lookup);
- return ret;
- }
- static int s2mps11_clk_remove(struct platform_device *pdev)
- {
- struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
- int i;
- of_clk_del_provider(s2mps11_clks[0].clk_np);
- /* Drop the reference obtained in s2mps11_clk_parse_dt */
- of_node_put(s2mps11_clks[0].clk_np);
- for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
- /* Skip clocks not present on S2MPS14 */
- if (!s2mps11_clks[i].lookup)
- continue;
- clkdev_drop(s2mps11_clks[i].lookup);
- }
- return 0;
- }
- static const struct platform_device_id s2mps11_clk_id[] = {
- { "s2mps11-clk", S2MPS11X},
- { "s2mps13-clk", S2MPS13X},
- { "s2mps14-clk", S2MPS14X},
- { "s5m8767-clk", S5M8767X},
- { },
- };
- MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
- #ifdef CONFIG_OF
- /*
- * Device is instantiated through parent MFD device and device matching is done
- * through platform_device_id.
- *
- * However if device's DT node contains proper clock compatible and driver is
- * built as a module, then the *module* matching will be done trough DT aliases.
- * This requires of_device_id table. In the same time this will not change the
- * actual *device* matching so do not add .of_match_table.
- */
- static const struct of_device_id s2mps11_dt_match[] = {
- {
- .compatible = "samsung,s2mps11-clk",
- .data = (void *)S2MPS11X,
- }, {
- .compatible = "samsung,s2mps13-clk",
- .data = (void *)S2MPS13X,
- }, {
- .compatible = "samsung,s2mps14-clk",
- .data = (void *)S2MPS14X,
- }, {
- .compatible = "samsung,s5m8767-clk",
- .data = (void *)S5M8767X,
- }, {
- /* Sentinel */
- },
- };
- MODULE_DEVICE_TABLE(of, s2mps11_dt_match);
- #endif
- static struct platform_driver s2mps11_clk_driver = {
- .driver = {
- .name = "s2mps11-clk",
- },
- .probe = s2mps11_clk_probe,
- .remove = s2mps11_clk_remove,
- .id_table = s2mps11_clk_id,
- };
- static int __init s2mps11_clk_init(void)
- {
- return platform_driver_register(&s2mps11_clk_driver);
- }
- subsys_initcall(s2mps11_clk_init);
- static void __exit s2mps11_clk_cleanup(void)
- {
- platform_driver_unregister(&s2mps11_clk_driver);
- }
- module_exit(s2mps11_clk_cleanup);
- MODULE_DESCRIPTION("S2MPS11 Clock Driver");
- MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
- MODULE_LICENSE("GPL");
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