302 lines
7.6 KiB
C
302 lines
7.6 KiB
C
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/*
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* clk-s2mps11.c - Clock driver for S2MPS11.
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*
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* Copyright (C) 2013,2014 Samsung Electornics
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include <linux/clkdev.h>
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#include <linux/regmap.h>
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#include <linux/clk-provider.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/samsung/s2mps11.h>
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#include <linux/mfd/samsung/s2mps13.h>
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#include <linux/mfd/samsung/s2mps14.h>
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#include <linux/mfd/samsung/s5m8767.h>
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#include <linux/mfd/samsung/core.h>
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enum {
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S2MPS11_CLK_AP = 0,
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S2MPS11_CLK_CP,
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S2MPS11_CLK_BT,
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S2MPS11_CLKS_NUM,
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};
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struct s2mps11_clk {
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struct sec_pmic_dev *iodev;
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struct device_node *clk_np;
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struct clk_hw hw;
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struct clk *clk;
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struct clk_lookup *lookup;
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u32 mask;
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unsigned int reg;
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};
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static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
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{
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return container_of(hw, struct s2mps11_clk, hw);
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}
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static int s2mps11_clk_prepare(struct clk_hw *hw)
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{
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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return regmap_update_bits(s2mps11->iodev->regmap_pmic,
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s2mps11->reg,
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s2mps11->mask, s2mps11->mask);
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}
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static void s2mps11_clk_unprepare(struct clk_hw *hw)
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{
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
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s2mps11->mask, ~s2mps11->mask);
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}
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static int s2mps11_clk_is_prepared(struct clk_hw *hw)
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{
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int ret;
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u32 val;
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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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ret = regmap_read(s2mps11->iodev->regmap_pmic,
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s2mps11->reg, &val);
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if (ret < 0)
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return -EINVAL;
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return val & s2mps11->mask;
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}
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static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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return 32768;
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}
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static struct clk_ops s2mps11_clk_ops = {
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.prepare = s2mps11_clk_prepare,
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.unprepare = s2mps11_clk_unprepare,
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.is_prepared = s2mps11_clk_is_prepared,
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.recalc_rate = s2mps11_clk_recalc_rate,
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};
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/* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */
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static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
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[S2MPS11_CLK_AP] = {
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.name = "s2mps11_ap",
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.ops = &s2mps11_clk_ops,
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},
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[S2MPS11_CLK_CP] = {
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.name = "s2mps11_cp",
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.ops = &s2mps11_clk_ops,
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},
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[S2MPS11_CLK_BT] = {
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.name = "s2mps11_bt",
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.ops = &s2mps11_clk_ops,
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},
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};
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static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
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struct clk_init_data *clks_init)
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{
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struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct device_node *clk_np;
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int i;
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if (!iodev->dev->of_node)
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return ERR_PTR(-EINVAL);
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clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
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if (!clk_np) {
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dev_err(&pdev->dev, "could not find clock sub-node\n");
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return ERR_PTR(-EINVAL);
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}
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for (i = 0; i < S2MPS11_CLKS_NUM; i++)
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of_property_read_string_index(clk_np, "clock-output-names", i,
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&clks_init[i].name);
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return clk_np;
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}
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static int s2mps11_clk_probe(struct platform_device *pdev)
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{
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struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
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struct s2mps11_clk *s2mps11_clks;
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struct clk_hw_onecell_data *clk_data;
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unsigned int s2mps11_reg;
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int i, ret = 0;
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enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data;
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s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
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sizeof(*s2mps11_clks), GFP_KERNEL);
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if (!s2mps11_clks)
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return -ENOMEM;
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clk_data = devm_kzalloc(&pdev->dev, sizeof(*clk_data) +
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sizeof(*clk_data->hws) * S2MPS11_CLKS_NUM,
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GFP_KERNEL);
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if (!clk_data)
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return -ENOMEM;
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switch (hwid) {
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case S2MPS11X:
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s2mps11_reg = S2MPS11_REG_RTC_CTRL;
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break;
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case S2MPS13X:
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s2mps11_reg = S2MPS13_REG_RTCCTRL;
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break;
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case S2MPS14X:
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s2mps11_reg = S2MPS14_REG_RTCCTRL;
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break;
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case S5M8767X:
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s2mps11_reg = S5M8767_REG_CTRL1;
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break;
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default:
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dev_err(&pdev->dev, "Invalid device type\n");
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return -EINVAL;
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}
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/* Store clocks of_node in first element of s2mps11_clks array */
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s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init);
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if (IS_ERR(s2mps11_clks->clk_np))
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return PTR_ERR(s2mps11_clks->clk_np);
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for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
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if (i == S2MPS11_CLK_CP && hwid == S2MPS14X)
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continue; /* Skip clocks not present in some devices */
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s2mps11_clks[i].iodev = iodev;
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s2mps11_clks[i].hw.init = &s2mps11_clks_init[i];
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s2mps11_clks[i].mask = 1 << i;
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s2mps11_clks[i].reg = s2mps11_reg;
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s2mps11_clks[i].clk = devm_clk_register(&pdev->dev,
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&s2mps11_clks[i].hw);
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if (IS_ERR(s2mps11_clks[i].clk)) {
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dev_err(&pdev->dev, "Fail to register : %s\n",
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s2mps11_clks_init[i].name);
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ret = PTR_ERR(s2mps11_clks[i].clk);
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goto err_reg;
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}
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s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw,
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s2mps11_clks_init[i].name, NULL);
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if (!s2mps11_clks[i].lookup) {
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ret = -ENOMEM;
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goto err_reg;
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}
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clk_data->hws[i] = &s2mps11_clks[i].hw;
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}
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clk_data->num = S2MPS11_CLKS_NUM;
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of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get,
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clk_data);
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platform_set_drvdata(pdev, s2mps11_clks);
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return ret;
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err_reg:
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while (--i >= 0)
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clkdev_drop(s2mps11_clks[i].lookup);
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return ret;
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}
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static int s2mps11_clk_remove(struct platform_device *pdev)
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{
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struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
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int i;
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of_clk_del_provider(s2mps11_clks[0].clk_np);
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/* Drop the reference obtained in s2mps11_clk_parse_dt */
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of_node_put(s2mps11_clks[0].clk_np);
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for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
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/* Skip clocks not present on S2MPS14 */
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if (!s2mps11_clks[i].lookup)
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continue;
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clkdev_drop(s2mps11_clks[i].lookup);
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}
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return 0;
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}
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static const struct platform_device_id s2mps11_clk_id[] = {
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{ "s2mps11-clk", S2MPS11X},
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{ "s2mps13-clk", S2MPS13X},
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{ "s2mps14-clk", S2MPS14X},
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{ "s5m8767-clk", S5M8767X},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
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#ifdef CONFIG_OF
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/*
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* Device is instantiated through parent MFD device and device matching is done
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* through platform_device_id.
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*
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* However if device's DT node contains proper clock compatible and driver is
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* built as a module, then the *module* matching will be done trough DT aliases.
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* This requires of_device_id table. In the same time this will not change the
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* actual *device* matching so do not add .of_match_table.
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*/
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static const struct of_device_id s2mps11_dt_match[] = {
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{
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.compatible = "samsung,s2mps11-clk",
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.data = (void *)S2MPS11X,
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}, {
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.compatible = "samsung,s2mps13-clk",
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.data = (void *)S2MPS13X,
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}, {
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.compatible = "samsung,s2mps14-clk",
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.data = (void *)S2MPS14X,
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}, {
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.compatible = "samsung,s5m8767-clk",
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.data = (void *)S5M8767X,
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}, {
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/* Sentinel */
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},
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};
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MODULE_DEVICE_TABLE(of, s2mps11_dt_match);
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#endif
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static struct platform_driver s2mps11_clk_driver = {
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.driver = {
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.name = "s2mps11-clk",
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},
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.probe = s2mps11_clk_probe,
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.remove = s2mps11_clk_remove,
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.id_table = s2mps11_clk_id,
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};
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static int __init s2mps11_clk_init(void)
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{
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return platform_driver_register(&s2mps11_clk_driver);
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}
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subsys_initcall(s2mps11_clk_init);
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static void __exit s2mps11_clk_cleanup(void)
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{
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platform_driver_unregister(&s2mps11_clk_driver);
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}
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module_exit(s2mps11_clk_cleanup);
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MODULE_DESCRIPTION("S2MPS11 Clock Driver");
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MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
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MODULE_LICENSE("GPL");
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