diff options
Diffstat (limited to 'drivers/clk/clk-s2mps11.c')
| -rw-r--r-- | drivers/clk/clk-s2mps11.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c new file mode 100644 index 000000000..f3aaefafb --- /dev/null +++ b/drivers/clk/clk-s2mps11.c @@ -0,0 +1,302 @@ +/* + * 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> + +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, +}; + +/* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */ +static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { + [S2MPS11_CLK_AP] = { + .name = "s2mps11_ap", + .ops = &s2mps11_clk_ops, + }, + [S2MPS11_CLK_CP] = { + .name = "s2mps11_cp", + .ops = &s2mps11_clk_ops, + }, + [S2MPS11_CLK_BT] = { + .name = "s2mps11_bt", + .ops = &s2mps11_clk_ops, + }, +}; + +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++) + 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; + struct clk_hw_onecell_data *clk_data; + unsigned int s2mps11_reg; + int i, ret = 0; + enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data; + + s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM, + sizeof(*s2mps11_clks), GFP_KERNEL); + if (!s2mps11_clks) + return -ENOMEM; + + clk_data = devm_kzalloc(&pdev->dev, + struct_size(clk_data, hws, S2MPS11_CLKS_NUM), + GFP_KERNEL); + if (!clk_data) + return -ENOMEM; + + switch (hwid) { + case S2MPS11X: + s2mps11_reg = S2MPS11_REG_RTC_CTRL; + break; + case S2MPS13X: + s2mps11_reg = S2MPS13_REG_RTCCTRL; + break; + case S2MPS14X: + s2mps11_reg = S2MPS14_REG_RTCCTRL; + break; + case S5M8767X: + s2mps11_reg = S5M8767_REG_CTRL1; + 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, s2mps11_clks_init); + if (IS_ERR(s2mps11_clks->clk_np)) + return PTR_ERR(s2mps11_clks->clk_np); + + for (i = 0; i < S2MPS11_CLKS_NUM; i++) { + if (i == S2MPS11_CLK_CP && hwid == S2MPS14X) + continue; /* Skip clocks not present in some devices */ + s2mps11_clks[i].iodev = iodev; + s2mps11_clks[i].hw.init = &s2mps11_clks_init[i]; + s2mps11_clks[i].mask = 1 << i; + s2mps11_clks[i].reg = s2mps11_reg; + + s2mps11_clks[i].clk = devm_clk_register(&pdev->dev, + &s2mps11_clks[i].hw); + if (IS_ERR(s2mps11_clks[i].clk)) { + dev_err(&pdev->dev, "Fail to register : %s\n", + s2mps11_clks_init[i].name); + ret = PTR_ERR(s2mps11_clks[i].clk); + goto err_reg; + } + + s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw, + s2mps11_clks_init[i].name, NULL); + if (!s2mps11_clks[i].lookup) { + ret = -ENOMEM; + goto err_reg; + } + clk_data->hws[i] = &s2mps11_clks[i].hw; + } + + clk_data->num = S2MPS11_CLKS_NUM; + of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get, + clk_data); + + platform_set_drvdata(pdev, s2mps11_clks); + + return ret; + +err_reg: + of_node_put(s2mps11_clks[0].clk_np); + 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[] __used = { + { + .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"); |