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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 MaxLinear, Inc.
* Copyright (C) 2020 Intel Corporation.
* Zhu Yixin <yzhu@maxlinear.com>
* Rahul Tanwar <rtanwar@maxlinear.com>
*/
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/iopoll.h>
#include <linux/of.h>
#include "clk-cgu.h"
#define to_lgm_clk_pll(_hw) container_of(_hw, struct lgm_clk_pll, hw)
#define PLL_REF_DIV(x) ((x) + 0x08)
/*
* Calculate formula:
* rate = (prate * mult + (prate * frac) / frac_div) / div
*/
static unsigned long
lgm_pll_calc_rate(unsigned long prate, unsigned int mult,
unsigned int div, unsigned int frac, unsigned int frac_div)
{
u64 crate, frate, rate64;
rate64 = prate;
crate = rate64 * mult;
frate = rate64 * frac;
do_div(frate, frac_div);
crate += frate;
do_div(crate, div);
return crate;
}
static unsigned long lgm_pll_recalc_rate(struct clk_hw *hw, unsigned long prate)
{
struct lgm_clk_pll *pll = to_lgm_clk_pll(hw);
unsigned int div, mult, frac;
mult = lgm_get_clk_val(pll->membase, PLL_REF_DIV(pll->reg), 0, 12);
div = lgm_get_clk_val(pll->membase, PLL_REF_DIV(pll->reg), 18, 6);
frac = lgm_get_clk_val(pll->membase, pll->reg, 2, 24);
if (pll->type == TYPE_LJPLL)
div *= 4;
return lgm_pll_calc_rate(prate, mult, div, frac, BIT(24));
}
static int lgm_pll_is_enabled(struct clk_hw *hw)
{
struct lgm_clk_pll *pll = to_lgm_clk_pll(hw);
unsigned int ret;
ret = lgm_get_clk_val(pll->membase, pll->reg, 0, 1);
return ret;
}
static int lgm_pll_enable(struct clk_hw *hw)
{
struct lgm_clk_pll *pll = to_lgm_clk_pll(hw);
u32 val;
int ret;
lgm_set_clk_val(pll->membase, pll->reg, 0, 1, 1);
ret = regmap_read_poll_timeout_atomic(pll->membase, pll->reg,
val, (val & 0x1), 1, 100);
return ret;
}
static void lgm_pll_disable(struct clk_hw *hw)
{
struct lgm_clk_pll *pll = to_lgm_clk_pll(hw);
lgm_set_clk_val(pll->membase, pll->reg, 0, 1, 0);
}
static const struct clk_ops lgm_pll_ops = {
.recalc_rate = lgm_pll_recalc_rate,
.is_enabled = lgm_pll_is_enabled,
.enable = lgm_pll_enable,
.disable = lgm_pll_disable,
};
static struct clk_hw *
lgm_clk_register_pll(struct lgm_clk_provider *ctx,
const struct lgm_pll_clk_data *list)
{
struct clk_init_data init = {};
struct lgm_clk_pll *pll;
struct device *dev = ctx->dev;
struct clk_hw *hw;
int ret;
init.ops = &lgm_pll_ops;
init.name = list->name;
init.flags = list->flags;
init.parent_data = list->parent_data;
init.num_parents = list->num_parents;
pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
pll->membase = ctx->membase;
pll->reg = list->reg;
pll->flags = list->flags;
pll->type = list->type;
pll->hw.init = &init;
hw = &pll->hw;
ret = devm_clk_hw_register(dev, hw);
if (ret)
return ERR_PTR(ret);
return hw;
}
int lgm_clk_register_plls(struct lgm_clk_provider *ctx,
const struct lgm_pll_clk_data *list,
unsigned int nr_clk)
{
struct clk_hw *hw;
int i;
for (i = 0; i < nr_clk; i++, list++) {
hw = lgm_clk_register_pll(ctx, list);
if (IS_ERR(hw)) {
dev_err(ctx->dev, "failed to register pll: %s\n",
list->name);
return PTR_ERR(hw);
}
ctx->clk_data.hws[list->id] = hw;
}
return 0;
}
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