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// SPDX-License-Identifier: GPL-2.0-only
/*
* Toshiba Visconti clock controller
*
* Copyright (c) 2021 TOSHIBA CORPORATION
* Copyright (c) 2021 Toshiba Electronic Devices & Storage Corporation
*
* Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@toshiba.co.jp>
*/
#include <linux/clk-provider.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <linux/string.h>
#include "clkc.h"
static inline struct visconti_clk_gate *to_visconti_clk_gate(struct clk_hw *hw)
{
return container_of(hw, struct visconti_clk_gate, hw);
}
static int visconti_gate_clk_is_enabled(struct clk_hw *hw)
{
struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
u32 clk = BIT(gate->ck_idx);
u32 val;
regmap_read(gate->regmap, gate->ckon_offset, &val);
return (val & clk) ? 1 : 0;
}
static void visconti_gate_clk_disable(struct clk_hw *hw)
{
struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
u32 clk = BIT(gate->ck_idx);
unsigned long flags;
spin_lock_irqsave(gate->lock, flags);
if (!visconti_gate_clk_is_enabled(hw)) {
spin_unlock_irqrestore(gate->lock, flags);
return;
}
regmap_update_bits(gate->regmap, gate->ckoff_offset, clk, clk);
spin_unlock_irqrestore(gate->lock, flags);
}
static int visconti_gate_clk_enable(struct clk_hw *hw)
{
struct visconti_clk_gate *gate = to_visconti_clk_gate(hw);
u32 clk = BIT(gate->ck_idx);
unsigned long flags;
spin_lock_irqsave(gate->lock, flags);
regmap_update_bits(gate->regmap, gate->ckon_offset, clk, clk);
spin_unlock_irqrestore(gate->lock, flags);
return 0;
}
static const struct clk_ops visconti_clk_gate_ops = {
.enable = visconti_gate_clk_enable,
.disable = visconti_gate_clk_disable,
.is_enabled = visconti_gate_clk_is_enabled,
};
static struct clk_hw *visconti_clk_register_gate(struct device *dev,
const char *name,
const char *parent_name,
struct regmap *regmap,
const struct visconti_clk_gate_table *clks,
u32 rson_offset,
u32 rsoff_offset,
u8 rs_idx,
spinlock_t *lock)
{
struct visconti_clk_gate *gate;
struct clk_parent_data *pdata;
struct clk_init_data init;
struct clk_hw *hw;
int ret;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return ERR_PTR(-ENOMEM);
pdata->name = pdata->fw_name = parent_name;
gate = devm_kzalloc(dev, sizeof(*gate), GFP_KERNEL);
if (!gate)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &visconti_clk_gate_ops;
init.flags = clks->flags;
init.parent_data = pdata;
init.num_parents = 1;
gate->regmap = regmap;
gate->ckon_offset = clks->ckon_offset;
gate->ckoff_offset = clks->ckoff_offset;
gate->ck_idx = clks->ck_idx;
gate->rson_offset = rson_offset;
gate->rsoff_offset = rsoff_offset;
gate->rs_idx = rs_idx;
gate->lock = lock;
gate->hw.init = &init;
hw = &gate->hw;
ret = devm_clk_hw_register(dev, hw);
if (ret)
hw = ERR_PTR(ret);
return hw;
}
int visconti_clk_register_gates(struct visconti_clk_provider *ctx,
const struct visconti_clk_gate_table *clks,
int num_gate,
const struct visconti_reset_data *reset,
spinlock_t *lock)
{
struct device *dev = ctx->dev;
int i;
for (i = 0; i < num_gate; i++) {
const char *parent_div_name = clks[i].parent_data[0].name;
struct clk_parent_data *pdata;
u32 rson_offset, rsoff_offset;
struct clk_hw *gate_clk;
struct clk_hw *div_clk;
char *dev_name;
u8 rs_idx;
pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;
dev_name = devm_kasprintf(dev, GFP_KERNEL, "%s_div", clks[i].name);
if (!dev_name)
return -ENOMEM;
if (clks[i].rs_id != NO_RESET) {
rson_offset = reset[clks[i].rs_id].rson_offset;
rsoff_offset = reset[clks[i].rs_id].rsoff_offset;
rs_idx = reset[clks[i].rs_id].rs_idx;
} else {
rson_offset = rsoff_offset = rs_idx = -1;
}
div_clk = devm_clk_hw_register_fixed_factor(dev,
dev_name,
parent_div_name,
0, 1,
clks[i].div);
if (IS_ERR(div_clk))
return PTR_ERR(div_clk);
gate_clk = visconti_clk_register_gate(dev,
clks[i].name,
dev_name,
ctx->regmap,
&clks[i],
rson_offset,
rsoff_offset,
rs_idx,
lock);
if (IS_ERR(gate_clk)) {
dev_err(dev, "%s: failed to register clock %s\n",
__func__, clks[i].name);
return PTR_ERR(gate_clk);
}
ctx->clk_data.hws[clks[i].id] = gate_clk;
}
return 0;
}
struct visconti_clk_provider *visconti_init_clk(struct device *dev,
struct regmap *regmap,
unsigned long nr_clks)
{
struct visconti_clk_provider *ctx;
int i;
ctx = devm_kzalloc(dev, struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL);
if (!ctx)
return ERR_PTR(-ENOMEM);
for (i = 0; i < nr_clks; ++i)
ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
ctx->clk_data.num = nr_clks;
ctx->dev = dev;
ctx->regmap = regmap;
return ctx;
}
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