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274 lines
6.5 KiB
C
274 lines
6.5 KiB
C
![]() |
/*
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* clk-s2mps11.c - Clock driver for S2MPS11.
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*
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* Copyright (C) 2013 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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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/core.h>
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#define s2mps11_name(a) (a->hw.init->name)
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static struct clk **clk_table;
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static struct clk_onecell_data clk_data;
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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 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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bool enabled;
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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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int ret;
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ret = regmap_update_bits(s2mps11->iodev->regmap,
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S2MPS11_REG_RTC_CTRL,
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s2mps11->mask, s2mps11->mask);
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if (!ret)
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s2mps11->enabled = true;
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return ret;
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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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int ret;
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ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL,
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s2mps11->mask, ~s2mps11->mask);
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if (!ret)
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s2mps11->enabled = false;
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}
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static int s2mps11_clk_is_enabled(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 s2mps11->enabled;
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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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struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
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if (s2mps11->enabled)
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return 32768;
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else
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return 0;
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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_enabled = s2mps11_clk_is_enabled,
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.recalc_rate = s2mps11_clk_recalc_rate,
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};
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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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.flags = CLK_IS_ROOT,
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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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.flags = CLK_IS_ROOT,
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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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.flags = CLK_IS_ROOT,
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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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{
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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 NULL;
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clk_np = of_find_node_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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clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) *
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S2MPS11_CLKS_NUM, GFP_KERNEL);
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if (!clk_table)
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return ERR_PTR(-ENOMEM);
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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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&s2mps11_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, *s2mps11_clk;
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struct device_node *clk_np = NULL;
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int i, ret = 0;
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u32 val;
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s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) *
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S2MPS11_CLKS_NUM, GFP_KERNEL);
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if (!s2mps11_clks)
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return -ENOMEM;
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s2mps11_clk = s2mps11_clks;
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clk_np = s2mps11_clk_parse_dt(pdev);
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if (IS_ERR(clk_np))
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return PTR_ERR(clk_np);
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for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
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s2mps11_clk->iodev = iodev;
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s2mps11_clk->hw.init = &s2mps11_clks_init[i];
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s2mps11_clk->mask = 1 << i;
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ret = regmap_read(s2mps11_clk->iodev->regmap,
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S2MPS11_REG_RTC_CTRL, &val);
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if (ret < 0)
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goto err_reg;
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s2mps11_clk->enabled = val & s2mps11_clk->mask;
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s2mps11_clk->clk = devm_clk_register(&pdev->dev,
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&s2mps11_clk->hw);
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if (IS_ERR(s2mps11_clk->clk)) {
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dev_err(&pdev->dev, "Fail to register : %s\n",
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s2mps11_name(s2mps11_clk));
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ret = PTR_ERR(s2mps11_clk->clk);
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goto err_reg;
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}
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s2mps11_clk->lookup = devm_kzalloc(&pdev->dev,
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sizeof(struct clk_lookup), GFP_KERNEL);
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if (!s2mps11_clk->lookup) {
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ret = -ENOMEM;
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goto err_lup;
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}
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s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk);
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s2mps11_clk->lookup->clk = s2mps11_clk->clk;
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clkdev_add(s2mps11_clk->lookup);
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}
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if (clk_table) {
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for (i = 0; i < S2MPS11_CLKS_NUM; i++)
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clk_table[i] = s2mps11_clks[i].clk;
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clk_data.clks = clk_table;
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clk_data.clk_num = S2MPS11_CLKS_NUM;
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of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data);
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}
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platform_set_drvdata(pdev, s2mps11_clks);
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return ret;
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err_lup:
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devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
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err_reg:
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while (s2mps11_clk > s2mps11_clks) {
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if (s2mps11_clk->lookup) {
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clkdev_drop(s2mps11_clk->lookup);
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devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
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}
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s2mps11_clk--;
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}
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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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for (i = 0; i < S2MPS11_CLKS_NUM; i++)
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clkdev_drop(s2mps11_clks[i].lookup);
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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", 0},
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{ },
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};
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MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
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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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.owner = THIS_MODULE,
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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 __init 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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