107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
|
|
* Copyright (C) 2013 Freescale Semiconductor, Inc.
|
|
*
|
|
* The code contained herein is licensed under the GNU General Public
|
|
* License. You may obtain a copy of the GNU General Public License
|
|
* Version 2 or later at the following locations:
|
|
*
|
|
* http://www.opensource.org/licenses/gpl-license.html
|
|
* http://www.gnu.org/copyleft/gpl.html
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include "clk.h"
|
|
|
|
/**
|
|
* struct clk_fixup_mux - imx integer fixup multiplexer clock
|
|
* @mux: the parent class
|
|
* @ops: pointer to clk_ops of parent class
|
|
* @fixup: a hook to fixup the write value
|
|
*
|
|
* The imx fixup multiplexer clock is a subclass of basic clk_mux
|
|
* with an addtional fixup hook.
|
|
*/
|
|
struct clk_fixup_mux {
|
|
struct clk_mux mux;
|
|
const struct clk_ops *ops;
|
|
void (*fixup)(u32 *val);
|
|
};
|
|
|
|
static inline struct clk_fixup_mux *to_clk_fixup_mux(struct clk_hw *hw)
|
|
{
|
|
struct clk_mux *mux = to_clk_mux(hw);
|
|
|
|
return container_of(mux, struct clk_fixup_mux, mux);
|
|
}
|
|
|
|
static u8 clk_fixup_mux_get_parent(struct clk_hw *hw)
|
|
{
|
|
struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
|
|
|
|
return fixup_mux->ops->get_parent(&fixup_mux->mux.hw);
|
|
}
|
|
|
|
static int clk_fixup_mux_set_parent(struct clk_hw *hw, u8 index)
|
|
{
|
|
struct clk_fixup_mux *fixup_mux = to_clk_fixup_mux(hw);
|
|
struct clk_mux *mux = to_clk_mux(hw);
|
|
unsigned long flags = 0;
|
|
u32 val;
|
|
|
|
spin_lock_irqsave(mux->lock, flags);
|
|
|
|
val = readl(mux->reg);
|
|
val &= ~(mux->mask << mux->shift);
|
|
val |= index << mux->shift;
|
|
fixup_mux->fixup(&val);
|
|
writel(val, mux->reg);
|
|
|
|
spin_unlock_irqrestore(mux->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops clk_fixup_mux_ops = {
|
|
.get_parent = clk_fixup_mux_get_parent,
|
|
.set_parent = clk_fixup_mux_set_parent,
|
|
};
|
|
|
|
struct clk *imx_clk_fixup_mux(const char *name, void __iomem *reg,
|
|
u8 shift, u8 width, const char **parents,
|
|
int num_parents, void (*fixup)(u32 *val))
|
|
{
|
|
struct clk_fixup_mux *fixup_mux;
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
|
|
if (!fixup)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
fixup_mux = kzalloc(sizeof(*fixup_mux), GFP_KERNEL);
|
|
if (!fixup_mux)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &clk_fixup_mux_ops;
|
|
init.parent_names = parents;
|
|
init.num_parents = num_parents;
|
|
init.flags = 0;
|
|
|
|
fixup_mux->mux.reg = reg;
|
|
fixup_mux->mux.shift = shift;
|
|
fixup_mux->mux.mask = BIT(width) - 1;
|
|
fixup_mux->mux.lock = &imx_ccm_lock;
|
|
fixup_mux->mux.hw.init = &init;
|
|
fixup_mux->ops = &clk_mux_ops;
|
|
fixup_mux->fixup = fixup;
|
|
|
|
clk = clk_register(NULL, &fixup_mux->mux.hw);
|
|
if (IS_ERR(clk))
|
|
kfree(fixup_mux);
|
|
|
|
return clk;
|
|
}
|