// SPDX-License-Identifier: GPL-2.0-only
/*
* PRCMU clock implementation for ux500 platform.
*
* Copyright (C) 2012 ST-Ericsson SA
* Author: Ulf Hansson <[email protected]>
*/
#include <linux/clk-provider.h>
#include <linux/mfd/dbx500-prcmu.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
#include "clk.h"
#define to_clk_prcmu(_hw) container_of(_hw, struct clk_prcmu, hw)
#define to_clk_prcmu_clkout(_hw) container_of(_hw, struct clk_prcmu_clkout, hw)
struct clk_prcmu {
struct clk_hw hw;
u8 cg_sel;
int opp_requested;
};
struct clk_prcmu_clkout {
struct clk_hw hw;
u8 clkout_id;
u8 source;
u8 divider;
};
/* PRCMU clock operations. */
static int clk_prcmu_prepare(struct clk_hw *hw)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
return prcmu_request_clock(clk->cg_sel, true);
}
static void clk_prcmu_unprepare(struct clk_hw *hw)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
if (prcmu_request_clock(clk->cg_sel, false))
pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
clk_hw_get_name(hw));
}
static unsigned long clk_prcmu_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
return prcmu_clock_rate(clk->cg_sel);
}
static long clk_prcmu_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
return prcmu_round_clock_rate(clk->cg_sel, rate);
}
static int clk_prcmu_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
return prcmu_set_clock_rate(clk->cg_sel, rate);
}
static int clk_prcmu_opp_prepare(struct clk_hw *hw)
{
int err;
struct clk_prcmu *clk = to_clk_prcmu(hw);
if (!clk->opp_requested) {
err = prcmu_qos_add_requirement(PRCMU_QOS_APE_OPP,
(char *)clk_hw_get_name(hw),
100);
if (err) {
pr_err("clk_prcmu: %s fail req APE OPP for %s.\n",
__func__, clk_hw_get_name(hw));
return err;
}
clk->opp_requested = 1;
}
err = prcmu_request_clock(clk->cg_sel, true);
if (err) {
prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP,
(char *)clk_hw_get_name(hw));
clk->opp_requested = 0;
return err;
}
return 0;
}
static void clk_prcmu_opp_unprepare(struct clk_hw *hw)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
if (prcmu_request_clock(clk->cg_sel, false)) {
pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
clk_hw_get_name(hw));
return;
}
if (clk->opp_requested) {
prcmu_qos_remove_requirement(PRCMU_QOS_APE_OPP,
(char *)clk_hw_get_name(hw));
clk->opp_requested = 0;
}
}
static int clk_prcmu_opp_volt_prepare(struct clk_hw *hw)
{
int err;
struct clk_prcmu *clk = to_clk_prcmu(hw);
if (!clk->opp_requested) {
err = prcmu_request_ape_opp_100_voltage(true);
if (err) {
pr_err("clk_prcmu: %s fail req APE OPP VOLT for %s.\n",
__func__, clk_hw_get_name(hw));
return err;
}
clk->opp_requested = 1;
}
err = prcmu_request_clock(clk->cg_sel, true);
if (err) {
prcmu_request_ape_opp_100_voltage(false);
clk->opp_requested = 0;
return err;
}
return 0;
}
static void clk_prcmu_opp_volt_unprepare(struct clk_hw *hw)
{
struct clk_prcmu *clk = to_clk_prcmu(hw);
if (prcmu_request_clock(clk->cg_sel, false)) {
pr_err("clk_prcmu: %s failed to disable %s.\n", __func__,
clk_hw_get_name(hw));
return;
}
if (clk->opp_requested) {
prcmu_request_ape_opp_100_voltage(false);
clk->opp_requested = 0;
}
}
static const struct clk_ops clk_prcmu_scalable_ops = {
.prepare = clk_prcmu_prepare,
.unprepare = clk_prcmu_unprepare,
.recalc_rate = clk_prcmu_recalc_rate,
.round_rate = clk_prcmu_round_rate,
.set_rate = clk_prcmu_set_rate,
};
static const struct clk_ops clk_prcmu_gate_ops = {
.prepare = clk_prcmu_prepare,
.unprepare = clk_prcmu_unprepare,
.recalc_rate = clk_prcmu_recalc_rate,
};
static const struct clk_ops clk_prcmu_scalable_rate_ops = {
.recalc_rate = clk_prcmu_recalc_rate,
.round_rate = clk_prcmu_round_rate,
.set_rate = clk_prcmu_set_rate,
};
static const struct clk_ops clk_prcmu_rate_ops = {
.recalc_rate = clk_prcmu_recalc_rate,
};
static const struct clk_ops clk_prcmu_opp_gate_ops = {
.prepare = clk_prcmu_opp_prepare,
.unprepare = clk_prcmu_opp_unprepare,
.recalc_rate = clk_prcmu_recalc_rate,
};
static const struct clk_ops clk_prcmu_opp_volt_scalable_ops = {
.prepare = clk_prcmu_opp_volt_prepare,
.unprepare = clk_prcmu_opp_volt_unprepare,
.recalc_rate = clk_prcmu_recalc_rate,
.round_rate = clk_prcmu_round_rate,
.set_rate = clk_prcmu_set_rate,
};
static struct clk_hw *clk_reg_prcmu(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long rate,
unsigned long flags,
const struct clk_ops *clk_prcmu_ops)
{
struct clk_prcmu *clk;
struct clk_init_data clk_prcmu_init;
int ret;
if (!name) {
pr_err("clk_prcmu: %s invalid arguments passed\n", __func__);
return ERR_PTR(-EINVAL);
}
clk = kzalloc(sizeof(*clk), GFP_KERNEL);
if (!clk)
return ERR_PTR(-ENOMEM);
clk->cg_sel = cg_sel;
clk->opp_requested = 0;
/* "rate" can be used for changing the initial frequency */
if (rate)
prcmu_set_clock_rate(cg_sel, rate);
clk_prcmu_init.name = name;
clk_prcmu_init.ops = clk_prcmu_ops;
clk_prcmu_init.flags = flags;
clk_prcmu_init.parent_names = (parent_name ? &parent_name : NULL);
clk_prcmu_init.num_parents = (parent_name ? 1 : 0);
clk->hw.init = &clk_prcmu_init;
ret = clk_hw_register(NULL, &clk->hw);
if (ret)
goto free_clk;
return &clk->hw;
free_clk:
kfree(clk);
pr_err("clk_prcmu: %s failed to register clk\n", __func__);
return ERR_PTR(-ENOMEM);
}
struct clk_hw *clk_reg_prcmu_scalable(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long rate,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
&clk_prcmu_scalable_ops);
}
struct clk_hw *clk_reg_prcmu_gate(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
&clk_prcmu_gate_ops);
}
struct clk_hw *clk_reg_prcmu_scalable_rate(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long rate,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
&clk_prcmu_scalable_rate_ops);
}
struct clk_hw *clk_reg_prcmu_rate(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
&clk_prcmu_rate_ops);
}
struct clk_hw *clk_reg_prcmu_opp_gate(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, 0, flags,
&clk_prcmu_opp_gate_ops);
}
struct clk_hw *clk_reg_prcmu_opp_volt_scalable(const char *name,
const char *parent_name,
u8 cg_sel,
unsigned long rate,
unsigned long flags)
{
return clk_reg_prcmu(name, parent_name, cg_sel, rate, flags,
&clk_prcmu_opp_volt_scalable_ops);
}
/* The clkout (external) clock is special and need special ops */
static int clk_prcmu_clkout_prepare(struct clk_hw *hw)
{
struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
return prcmu_config_clkout(clk->clkout_id, clk->source, clk->divider);
}
static void clk_prcmu_clkout_unprepare(struct clk_hw *hw)
{
struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
int ret;
/* The clkout clock is disabled by dividing by 0 */
ret = prcmu_config_clkout(clk->clkout_id, clk->source, 0);
if (ret)
pr_err("clk_prcmu: %s failed to disable %s\n", __func__,
clk_hw_get_name(hw));
}
static unsigned long clk_prcmu_clkout_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
return (parent_rate / clk->divider);
}
static u8 clk_prcmu_clkout_get_parent(struct clk_hw *hw)
{
struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
return clk->source;
}
static int clk_prcmu_clkout_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_prcmu_clkout *clk = to_clk_prcmu_clkout(hw);
clk->source = index;
/* Make sure the change reaches the hardware immediately */
if (clk_hw_is_prepared(hw))
return clk_prcmu_clkout_prepare(hw);
return 0;
}
static const struct clk_ops clk_prcmu_clkout_ops = {
.prepare = clk_prcmu_clkout_prepare,
.unprepare = clk_prcmu_clkout_unprepare,
.recalc_rate = clk_prcmu_clkout_recalc_rate,
.determine_rate = clk_hw_determine_rate_no_reparent,
.get_parent = clk_prcmu_clkout_get_parent,
.set_parent = clk_prcmu_clkout_set_parent,
};
struct clk_hw *clk_reg_prcmu_clkout(const char *name,
const char * const *parent_names,
int num_parents,
u8 source, u8 divider)
{
struct clk_prcmu_clkout *clk;
struct clk_init_data clk_prcmu_clkout_init;
u8 clkout_id;
int ret;
if (!name) {
pr_err("clk_prcmu_clkout: %s invalid arguments passed\n", __func__);
return ERR_PTR(-EINVAL);
}
if (!strcmp(name, "clkout1"))
clkout_id = 0;
else if (!strcmp(name, "clkout2"))
clkout_id = 1;
else {
pr_err("clk_prcmu_clkout: %s bad clock name\n", __func__);
return ERR_PTR(-EINVAL);
}
clk = kzalloc(sizeof(*clk), GFP_KERNEL);
if (!clk)
return ERR_PTR(-ENOMEM);
clk->clkout_id = clkout_id;
clk->source = source;
clk->divider = divider;
clk_prcmu_clkout_init.name = name;
clk_prcmu_clkout_init.ops = &clk_prcmu_clkout_ops;
clk_prcmu_clkout_init.flags = CLK_GET_RATE_NOCACHE;
clk_prcmu_clkout_init.parent_names = parent_names;
clk_prcmu_clkout_init.num_parents = num_parents;
clk->hw.init = &clk_prcmu_clkout_init;
ret = clk_hw_register(NULL, &clk->hw);
if (ret)
goto free_clkout;
return &clk->hw;
free_clkout:
kfree(clk);
pr_err("clk_prcmu_clkout: %s failed to register clk\n", __func__);
return ERR_PTR(-ENOMEM);
}
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