Commit 811f67cc authored by tianshuliang's avatar tianshuliang Committed by Shawn Guo

clk: hisilicon: add hisi phase clock support

Add a phase clock type for HiSilicon SoCs,which supports
clk_set_phase operation.
Signed-off-by: default avatartianshuliang <tianshuliang@hisilicon.com>
Signed-off-by: default avatarJiancheng Xue <xuejiancheng@hisilicon.com>
Signed-off-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent 80f8ce58
......@@ -3,7 +3,7 @@
# Hisilicon Clock specific Makefile
#
obj-y += clk.o clkgate-separated.o clkdivider-hi6220.o
obj-y += clk.o clkgate-separated.o clkdivider-hi6220.o clk-hisi-phase.o
obj-$(CONFIG_ARCH_HI3xxx) += clk-hi3620.o
obj-$(CONFIG_ARCH_HIP04) += clk-hip04.o
......
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2017 HiSilicon Technologies Co., Ltd.
*
* Simple HiSilicon phase clock implementation.
*/
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include "clk.h"
struct clk_hisi_phase {
struct clk_hw hw;
void __iomem *reg;
u32 *phase_degrees;
u32 *phase_regvals;
u8 phase_num;
u32 mask;
u8 shift;
u8 flags;
spinlock_t *lock;
};
#define to_clk_hisi_phase(_hw) container_of(_hw, struct clk_hisi_phase, hw)
static int hisi_phase_regval_to_degrees(struct clk_hisi_phase *phase,
u32 regval)
{
int i;
for (i = 0; i < phase->phase_num; i++)
if (phase->phase_regvals[i] == regval)
return phase->phase_degrees[i];
return -EINVAL;
}
static int hisi_clk_get_phase(struct clk_hw *hw)
{
struct clk_hisi_phase *phase = to_clk_hisi_phase(hw);
u32 regval;
regval = readl(phase->reg);
regval = (regval & phase->mask) >> phase->shift;
return hisi_phase_regval_to_degrees(phase, regval);
}
static int hisi_phase_degrees_to_regval(struct clk_hisi_phase *phase,
int degrees)
{
int i;
for (i = 0; i < phase->phase_num; i++)
if (phase->phase_degrees[i] == degrees)
return phase->phase_regvals[i];
return -EINVAL;
}
static int hisi_clk_set_phase(struct clk_hw *hw, int degrees)
{
struct clk_hisi_phase *phase = to_clk_hisi_phase(hw);
unsigned long flags = 0;
int regval;
u32 val;
regval = hisi_phase_degrees_to_regval(phase, degrees);
if (regval < 0)
return regval;
spin_lock_irqsave(phase->lock, flags);
val = clk_readl(phase->reg);
val &= ~phase->mask;
val |= regval << phase->shift;
clk_writel(val, phase->reg);
spin_unlock_irqrestore(phase->lock, flags);
return 0;
}
const struct clk_ops clk_phase_ops = {
.get_phase = hisi_clk_get_phase,
.set_phase = hisi_clk_set_phase,
};
struct clk *clk_register_hisi_phase(struct device *dev,
const struct hisi_phase_clock *clks,
void __iomem *base, spinlock_t *lock)
{
struct clk_hisi_phase *phase;
struct clk_init_data init;
phase = devm_kzalloc(dev, sizeof(struct clk_hisi_phase), GFP_KERNEL);
if (!phase)
return ERR_PTR(-ENOMEM);
init.name = clks->name;
init.ops = &clk_phase_ops;
init.flags = clks->flags | CLK_IS_BASIC;
init.parent_names = clks->parent_names ? &clks->parent_names : NULL;
init.num_parents = clks->parent_names ? 1 : 0;
phase->reg = base + clks->offset;
phase->shift = clks->shift;
phase->mask = (BIT(clks->width) - 1) << clks->shift;
phase->lock = lock;
phase->phase_degrees = clks->phase_degrees;
phase->phase_regvals = clks->phase_regvals;
phase->phase_num = clks->phase_num;
phase->hw.init = &init;
return devm_clk_register(dev, &phase->hw);
}
EXPORT_SYMBOL_GPL(clk_register_hisi_phase);
......@@ -197,6 +197,30 @@ int hisi_clk_register_mux(const struct hisi_mux_clock *clks,
}
EXPORT_SYMBOL_GPL(hisi_clk_register_mux);
int hisi_clk_register_phase(struct device *dev,
const struct hisi_phase_clock *clks,
int nums, struct hisi_clock_data *data)
{
void __iomem *base = data->base;
struct clk *clk;
int i;
for (i = 0; i < nums; i++) {
clk = clk_register_hisi_phase(dev, &clks[i], base,
&hisi_clk_lock);
if (IS_ERR(clk)) {
pr_err("%s: failed to register clock %s\n", __func__,
clks[i].name);
return PTR_ERR(clk);
}
data->clk_data.clks[clks[i].id] = clk;
}
return 0;
}
EXPORT_SYMBOL_GPL(hisi_clk_register_phase);
int hisi_clk_register_divider(const struct hisi_divider_clock *clks,
int nums, struct hisi_clock_data *data)
{
......
......@@ -68,6 +68,19 @@ struct hisi_mux_clock {
const char *alias;
};
struct hisi_phase_clock {
unsigned int id;
const char *name;
const char *parent_names;
unsigned long flags;
unsigned long offset;
u8 shift;
u8 width;
u32 *phase_degrees;
u32 *phase_regvals;
u8 phase_num;
};
struct hisi_divider_clock {
unsigned int id;
const char *name;
......@@ -120,6 +133,12 @@ int hisi_clk_register_fixed_factor(const struct hisi_fixed_factor_clock *,
int, struct hisi_clock_data *);
int hisi_clk_register_mux(const struct hisi_mux_clock *, int,
struct hisi_clock_data *);
struct clk *clk_register_hisi_phase(struct device *dev,
const struct hisi_phase_clock *clks,
void __iomem *base, spinlock_t *lock);
int hisi_clk_register_phase(struct device *dev,
const struct hisi_phase_clock *clks,
int nums, struct hisi_clock_data *data);
int hisi_clk_register_divider(const struct hisi_divider_clock *,
int, struct hisi_clock_data *);
int hisi_clk_register_gate(const struct hisi_gate_clock *,
......
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