From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Andr=C3=A9=20Fabian=20Silva=20Delgado?= Date: Wed, 5 Aug 2015 17:04:01 -0300 Subject: Initial import --- drivers/clk/clk-s2mps11.c | 335 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 335 insertions(+) create mode 100644 drivers/clk/clk-s2mps11.c (limited to 'drivers/clk/clk-s2mps11.c') diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c new file mode 100644 index 000000000..bfa1e64e2 --- /dev/null +++ b/drivers/clk/clk-s2mps11.c @@ -0,0 +1,335 @@ +/* + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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); + int ret; + + ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, + s2mps11->reg, + s2mps11->mask, s2mps11->mask); + + return ret; +} + +static void s2mps11_clk_unprepare(struct clk_hw *hw) +{ + struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); + int ret; + + ret = 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_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * + S2MPS11_CLKS_NUM, GFP_KERNEL); + if (!s2mps11_clks) + return -ENOMEM; + + s2mps11_clk = s2mps11_clks; + + clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * + S2MPS11_CLKS_NUM, 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_alloc(s2mps11_clk->clk, + s2mps11_name(s2mps11_clk), NULL); + if (!s2mps11_clk->lookup) { + ret = -ENOMEM; + goto err_lup; + } + + clkdev_add(s2mps11_clk->lookup); + } + + 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_lup: + devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); +err_reg: + while (s2mps11_clk > s2mps11_clks) { + if (s2mps11_clk->lookup) { + clkdev_drop(s2mps11_clk->lookup); + devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); + } + s2mps11_clk--; + } + + 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); + +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 __init 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 "); +MODULE_LICENSE("GPL"); -- cgit v1.2.3