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/*
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*/
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/regmap.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include "clk.h"
struct rockchip_muxgrf_clock {
struct clk_hw hw;
struct regmap *regmap;
u32 reg;
u32 shift;
u32 width;
int flags;
};
#define to_muxgrf_clock(_hw) container_of(_hw, struct rockchip_muxgrf_clock, hw)
static u8 rockchip_muxgrf_get_parent(struct clk_hw *hw)
{
struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
unsigned int mask = GENMASK(mux->width - 1, 0);
unsigned int val;
regmap_read(mux->regmap, mux->reg, &val);
val >>= mux->shift;
val &= mask;
return val;
}
static int rockchip_muxgrf_set_parent(struct clk_hw *hw, u8 index)
{
struct rockchip_muxgrf_clock *mux = to_muxgrf_clock(hw);
unsigned int mask = GENMASK(mux->width + mux->shift - 1, mux->shift);
unsigned int val;
val = index;
val <<= mux->shift;
if (mux->flags & CLK_MUX_HIWORD_MASK)
return regmap_write(mux->regmap, mux->reg, val | (mask << 16));
else
return regmap_update_bits(mux->regmap, mux->reg, mask, val);
}
static const struct clk_ops rockchip_muxgrf_clk_ops = {
.get_parent = rockchip_muxgrf_get_parent,
.set_parent = rockchip_muxgrf_set_parent,
.determine_rate = __clk_mux_determine_rate,
};
struct clk *rockchip_clk_register_muxgrf(const char *name,
const char *const *parent_names, u8 num_parents,
int flags, struct regmap *regmap, int reg,
int shift, int width, int mux_flags)
{
struct rockchip_muxgrf_clock *muxgrf_clock;
struct clk_init_data init;
struct clk *clk;
if (IS_ERR(regmap)) {
pr_err("%s: regmap not available\n", __func__);
return ERR_PTR(-ENOTSUPP);
}
muxgrf_clock = kmalloc(sizeof(*muxgrf_clock), GFP_KERNEL);
if (!muxgrf_clock)
return ERR_PTR(-ENOMEM);
init.name = name;
init.flags = flags;
init.num_parents = num_parents;
init.parent_names = parent_names;
init.ops = &rockchip_muxgrf_clk_ops;
muxgrf_clock->hw.init = &init;
muxgrf_clock->regmap = regmap;
muxgrf_clock->reg = reg;
muxgrf_clock->shift = shift;
muxgrf_clock->width = width;
muxgrf_clock->flags = mux_flags;
clk = clk_register(NULL, &muxgrf_clock->hw);
if (IS_ERR(clk))
kfree(muxgrf_clock);
return clk;
}
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