/*
* 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");
