274 строки
6.5 KiB
C
274 строки
6.5 KiB
C
/*
|
|
* 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_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 <yadi.brar@samsung.com>");
|
|
MODULE_LICENSE("GPL");
|