diff options
Diffstat (limited to 'drivers/clk/clk-s2mps11.c')
| -rw-r--r-- | drivers/clk/clk-s2mps11.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/drivers/clk/clk-s2mps11.c b/drivers/clk/clk-s2mps11.c new file mode 100644 index 000000000000..7be41e676a64 --- /dev/null +++ b/drivers/clk/clk-s2mps11.c @@ -0,0 +1,273 @@ +/* + * clk-s2mps11.c - Clock driver for S2MPS11. + * + * Copyright (C) 2013 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. + * + * 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/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/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 clk_hw hw; + struct clk *clk; + struct clk_lookup *lookup; + u32 mask; + bool enabled; +}; + +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, + S2MPS11_REG_RTC_CTRL, + s2mps11->mask, s2mps11->mask); + if (!ret) + s2mps11->enabled = true; + + 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, S2MPS11_REG_RTC_CTRL, + s2mps11->mask, ~s2mps11->mask); + + if (!ret) + s2mps11->enabled = false; +} + +static int s2mps11_clk_is_enabled(struct clk_hw *hw) +{ + struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); + + return s2mps11->enabled; +} + +static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); + if (s2mps11->enabled) + return 32768; + else + return 0; +} + +static struct clk_ops s2mps11_clk_ops = { + .prepare = s2mps11_clk_prepare, + .unprepare = s2mps11_clk_unprepare, + .is_enabled = s2mps11_clk_is_enabled, + .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 device_node *s2mps11_clk_parse_dt(struct platform_device *pdev) +{ + struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); + struct device_node *clk_np; + int i; + + if (!iodev->dev->of_node) + return NULL; + + clk_np = of_find_node_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); + } + + clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * + S2MPS11_CLKS_NUM, GFP_KERNEL); + if (!clk_table) + return ERR_PTR(-ENOMEM); + + for (i = 0; i < S2MPS11_CLKS_NUM; i++) + of_property_read_string_index(clk_np, "clock-output-names", i, + &s2mps11_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; + struct device_node *clk_np = NULL; + int i, ret = 0; + u32 val; + + s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * + S2MPS11_CLKS_NUM, GFP_KERNEL); + if (!s2mps11_clks) + return -ENOMEM; + + s2mps11_clk = s2mps11_clks; + + clk_np = s2mps11_clk_parse_dt(pdev); + if (IS_ERR(clk_np)) + return PTR_ERR(clk_np); + + for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { + s2mps11_clk->iodev = iodev; + s2mps11_clk->hw.init = &s2mps11_clks_init[i]; + s2mps11_clk->mask = 1 << i; + + ret = regmap_read(s2mps11_clk->iodev->regmap, + S2MPS11_REG_RTC_CTRL, &val); + if (ret < 0) + goto err_reg; + + s2mps11_clk->enabled = val & s2mps11_clk->mask; + + 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 = devm_kzalloc(&pdev->dev, + sizeof(struct clk_lookup), GFP_KERNEL); + if (!s2mps11_clk->lookup) { + ret = -ENOMEM; + goto err_lup; + } + + s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk); + s2mps11_clk->lookup->clk = s2mps11_clk->clk; + + clkdev_add(s2mps11_clk->lookup); + } + + if (clk_table) { + for (i = 0; i < S2MPS11_CLKS_NUM; i++) + clk_table[i] = s2mps11_clks[i].clk; + + clk_data.clks = clk_table; + clk_data.clk_num = S2MPS11_CLKS_NUM; + of_clk_add_provider(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; + + for (i = 0; i < S2MPS11_CLKS_NUM; i++) + clkdev_drop(s2mps11_clks[i].lookup); + + return 0; +} + +static const struct platform_device_id s2mps11_clk_id[] = { + { "s2mps11-clk", 0}, + { }, +}; +MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); + +static struct platform_driver s2mps11_clk_driver = { + .driver = { + .name = "s2mps11-clk", + .owner = THIS_MODULE, + }, + .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 <yadi.brar@samsung.com>"); +MODULE_LICENSE("GPL"); |