/* * 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 #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 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_pmic, 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_pmic, 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_pmic, 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 "); MODULE_LICENSE("GPL");