113 lines
2.9 KiB
C
Executable file
113 lines
2.9 KiB
C
Executable file
// SPDX-License-Identifier: GPL-2.0
|
|
/*
|
|
* Copyright (C) 2019 MediaTek Inc.
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/err.h>
|
|
#include <linux/io.h>
|
|
#include <linux/slab.h>
|
|
#include "clk-mtk.h"
|
|
#include "clk-fixup-div.h"
|
|
|
|
#define div_mask(d) ((1 << (d)) - 1)
|
|
|
|
static unsigned long clk_fixup_div_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
|
|
unsigned int val;
|
|
|
|
val = readl(fixup_div->reg_fixup) >> fixup_div->divider.shift;
|
|
val &= div_mask(fixup_div->divider.width);
|
|
pr_debug("%s: val = %x\n", __func__, val);
|
|
|
|
return divider_recalc_rate(hw, parent_rate, val,
|
|
fixup_div->clk_div_table,
|
|
fixup_div->divider.flags,
|
|
fixup_div->divider.width);
|
|
}
|
|
|
|
static long clk_fixup_div_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *prate)
|
|
{
|
|
struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
|
|
|
|
pr_debug("%s: rate = %lu, prate = %lu\n", __func__, rate, *prate);
|
|
|
|
return divider_round_rate(hw, rate, prate, fixup_div->clk_div_table,
|
|
fixup_div->divider.width,
|
|
fixup_div->divider.flags);
|
|
}
|
|
|
|
static int clk_fixup_div_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_fixup_div *fixup_div = to_clk_fixup_div(hw);
|
|
struct clk_divider *div = to_clk_divider(hw);
|
|
unsigned long flags = 0;
|
|
int val, value;
|
|
|
|
value = divider_get_val(rate, parent_rate, div->table,
|
|
div->width, div->flags);
|
|
if (value < 0)
|
|
return value;
|
|
|
|
spin_lock_irqsave(div->lock, flags);
|
|
|
|
val = readl(fixup_div->reg_fixup);
|
|
val &= ~(div_mask(div->width) << div->shift);
|
|
val |= (u32)value << div->shift;
|
|
|
|
writel(val, div->reg);
|
|
writel(val, fixup_div->reg_fixup);
|
|
|
|
pr_debug("%s: %s: reg_fixup = %x\n",
|
|
__func__, clk_hw_get_name(hw), readl(fixup_div->reg_fixup));
|
|
|
|
spin_unlock_irqrestore(div->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops clk_fixup_div_ops = {
|
|
.recalc_rate = clk_fixup_div_recalc_rate,
|
|
.round_rate = clk_fixup_div_round_rate,
|
|
.set_rate = clk_fixup_div_set_rate,
|
|
};
|
|
|
|
struct clk *mtk_clk_fixup_divider(const char *name, const char *parent,
|
|
unsigned long flags, void __iomem *reg,
|
|
void __iomem *reg_fixup, u8 shift, u8 width,
|
|
u8 clk_divider_flags, spinlock_t *lock)
|
|
{
|
|
struct clk_fixup_div *fixup_div;
|
|
struct clk *clk;
|
|
struct clk_init_data init = {};
|
|
|
|
fixup_div = kzalloc(sizeof(*fixup_div), GFP_KERNEL);
|
|
if (!fixup_div)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
init.name = name;
|
|
init.ops = &clk_fixup_div_ops;
|
|
init.flags = flags | CLK_IS_BASIC;
|
|
init.parent_names = parent ? &parent : NULL;
|
|
init.num_parents = parent ? 1 : 0;
|
|
|
|
fixup_div->reg_fixup = reg_fixup;
|
|
fixup_div->divider.reg = reg;
|
|
fixup_div->divider.flags = clk_divider_flags;
|
|
fixup_div->divider.shift = shift;
|
|
fixup_div->divider.width = width;
|
|
fixup_div->divider.lock = lock;
|
|
fixup_div->divider.hw.init = &init;
|
|
fixup_div->ops = &clk_divider_ops;
|
|
|
|
clk = clk_register(NULL, &fixup_div->divider.hw);
|
|
if (IS_ERR(clk))
|
|
kfree(fixup_div);
|
|
|
|
return clk;
|
|
}
|