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/*
* Copyright (C) 2014 Intel Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Adjustable fractional divider clock implementation.
* Output rate = (m / n) * parent_rate.
*/
#include <common.h>
#include <io.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/gcd.h>
#include <linux/math64.h>
#include <linux/barebox-wrapper.h>
#define to_clk_fd(_hw) container_of(_hw, struct clk_fractional_divider, clk)
struct clk_fractional_divider {
struct clk clk;
void __iomem *reg;
u8 mshift;
u32 mmask;
u8 nshift;
u32 nmask;
u8 flags;
};
static unsigned long clk_fd_recalc_rate(struct clk *hw,
unsigned long parent_rate)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
u32 val, m, n;
u64 ret;
val = readl(fd->reg);
m = (val & fd->mmask) >> fd->mshift;
n = (val & fd->nmask) >> fd->nshift;
ret = (u64)parent_rate * m;
do_div(ret, n);
return ret;
}
static long clk_fd_round_rate(struct clk *hw, unsigned long rate,
unsigned long *prate)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
unsigned maxn = (fd->nmask >> fd->nshift) + 1;
unsigned div;
if (!rate || rate >= *prate)
return *prate;
div = gcd(*prate, rate);
while ((*prate / div) > maxn) {
div <<= 1;
rate <<= 1;
}
return rate;
}
static int clk_fd_set_rate(struct clk *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_fractional_divider *fd = to_clk_fd(hw);
unsigned long div;
unsigned n, m;
u32 val;
div = gcd(parent_rate, rate);
m = rate / div;
n = parent_rate / div;
val = readl(fd->reg);
val &= ~(fd->mmask | fd->nmask);
val |= (m << fd->mshift) | (n << fd->nshift);
writel(val, fd->reg);
return 0;
}
const struct clk_ops clk_fractional_divider_ops = {
.recalc_rate = clk_fd_recalc_rate,
.round_rate = clk_fd_round_rate,
.set_rate = clk_fd_set_rate,
};
EXPORT_SYMBOL_GPL(clk_fractional_divider_ops);
struct clk *clk_fractional_divider_alloc(
const char *name, const char *parent_name, unsigned long flags,
void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
u8 clk_divider_flags)
{
struct clk_fractional_divider *fd;
fd = xzalloc(sizeof(*fd));
fd->reg = reg;
fd->mshift = mshift;
fd->mmask = (BIT(mwidth) - 1) << mshift;
fd->nshift = nshift;
fd->nmask = (BIT(nwidth) - 1) << nshift;
fd->flags = clk_divider_flags;
fd->clk.name = name;
fd->clk.ops = &clk_fractional_divider_ops;
fd->clk.flags = flags;
fd->clk.parent_names = parent_name ? &parent_name : NULL;
fd->clk.num_parents = parent_name ? 1 : 0;
return &fd->clk;
}
void clk_fractional_divider_free(struct clk *clk_fd)
{
struct clk_fractional_divider *fd = to_clk_fd(clk_fd);
free(fd);
}
struct clk *clk_fractional_divider(
const char *name, const char *parent_name, unsigned long flags,
void __iomem *reg, u8 mshift, u8 mwidth, u8 nshift, u8 nwidth,
u8 clk_divider_flags)
{
struct clk *fd;
int ret;
fd = clk_fractional_divider_alloc(name, parent_name, flags,
reg, mshift, mwidth, nshift, nwidth,
clk_divider_flags);
if (IS_ERR(fd))
return fd;
ret = clk_register(fd);
if (ret) {
clk_fractional_divider_free(fd);
return ERR_PTR(ret);
}
return fd;
}
EXPORT_SYMBOL_GPL(clk_fractional_divider);
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