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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MMP PLL clock rate calculation
*
* Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
*/
#include <linux/clk-provider.h>
#include <linux/slab.h>
#include <linux/io.h>
#include "clk.h"
#define to_clk_mmp_pll(hw) container_of(hw, struct mmp_clk_pll, hw)
struct mmp_clk_pll {
struct clk_hw hw;
unsigned long default_rate;
void __iomem *enable_reg;
u32 enable;
void __iomem *reg;
u8 shift;
unsigned long input_rate;
void __iomem *postdiv_reg;
u8 postdiv_shift;
};
static int mmp_clk_pll_is_enabled(struct clk_hw *hw)
{
struct mmp_clk_pll *pll = to_clk_mmp_pll(hw);
u32 val;
val = readl_relaxed(pll->enable_reg);
if ((val & pll->enable) == pll->enable)
return 1;
/* Some PLLs, if not software controlled, output default clock. */
if (pll->default_rate > 0)
return 1;
return 0;
}
static unsigned long mmp_clk_pll_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct mmp_clk_pll *pll = to_clk_mmp_pll(hw);
u32 fbdiv, refdiv, postdiv;
u64 rate;
u32 val;
val = readl_relaxed(pll->enable_reg);
if ((val & pll->enable) != pll->enable)
return pll->default_rate;
if (pll->reg) {
val = readl_relaxed(pll->reg);
fbdiv = (val >> pll->shift) & 0x1ff;
refdiv = (val >> (pll->shift + 9)) & 0x1f;
} else {
fbdiv = 2;
refdiv = 1;
}
if (pll->postdiv_reg) {
/* MMP3 clock rate calculation */
static const u8 postdivs[] = {2, 3, 4, 5, 6, 8, 10, 12, 16};
val = readl_relaxed(pll->postdiv_reg);
postdiv = (val >> pll->postdiv_shift) & 0x7;
rate = pll->input_rate;
rate *= 2 * fbdiv;
do_div(rate, refdiv);
do_div(rate, postdivs[postdiv]);
} else {
/* MMP2 clock rate calculation */
if (refdiv == 3) {
rate = 19200000;
} else if (refdiv == 4) {
rate = 26000000;
} else {
pr_err("bad refdiv: %d (0x%08x)\n", refdiv, val);
return 0;
}
rate *= fbdiv + 2;
do_div(rate, refdiv + 2);
}
return (unsigned long)rate;
}
static const struct clk_ops mmp_clk_pll_ops = {
.is_enabled = mmp_clk_pll_is_enabled,
.recalc_rate = mmp_clk_pll_recalc_rate,
};
struct clk *mmp_clk_register_pll(char *name,
unsigned long default_rate,
void __iomem *enable_reg, u32 enable,
void __iomem *reg, u8 shift,
unsigned long input_rate,
void __iomem *postdiv_reg, u8 postdiv_shift)
{
struct mmp_clk_pll *pll;
struct clk *clk;
struct clk_init_data init;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &mmp_clk_pll_ops;
init.flags = 0;
init.parent_names = NULL;
init.num_parents = 0;
pll->default_rate = default_rate;
pll->enable_reg = enable_reg;
pll->enable = enable;
pll->reg = reg;
pll->shift = shift;
pll->input_rate = input_rate;
pll->postdiv_reg = postdiv_reg;
pll->postdiv_shift = postdiv_shift;
pll->hw.init = &init;
clk = clk_register(NULL, &pll->hw);
if (IS_ERR(clk))
kfree(pll);
return clk;
}
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