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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* clk-gate.c - generic barebox clock support. Based on Linux clk support
*
* Copyright (c) 2012 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*/
#include <common.h>
#include <io.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
static void clk_gate_endisable(struct clk *clk, int enable)
{
struct clk_gate *gate = container_of(clk, struct clk_gate, clk);
int set = gate->flags & CLK_GATE_INVERTED ? 1 : 0;
u32 val;
set ^= enable;
if (gate->flags & CLK_GATE_HIWORD_MASK) {
val = BIT(gate->shift + 16);
if (set)
val |= BIT(gate->shift);
} else {
val = readl(gate->reg);
if (set)
val |= BIT(gate->shift);
else
val &= ~BIT(gate->shift);
}
writel(val, gate->reg);
}
static int clk_gate_enable(struct clk *clk)
{
clk_gate_endisable(clk, 1);
return 0;
}
static void clk_gate_disable(struct clk *clk)
{
clk_gate_endisable(clk, 0);
}
int clk_gate_is_enabled(struct clk *clk)
{
struct clk_gate *g = container_of(clk, struct clk_gate, clk);
u32 val;
val = readl(g->reg);
if (val & (1 << g->shift))
return g->flags & CLK_GATE_INVERTED ? 0 : 1;
else
return g->flags & CLK_GATE_INVERTED ? 1 : 0;
}
struct clk_ops clk_gate_ops = {
.set_rate = clk_parent_set_rate,
.round_rate = clk_parent_round_rate,
.enable = clk_gate_enable,
.disable = clk_gate_disable,
.is_enabled = clk_gate_is_enabled,
};
struct clk *clk_gate_alloc(const char *name, const char *parent,
void __iomem *reg, u8 shift, unsigned flags, u8 clk_gate_flags)
{
struct clk_gate *g = xzalloc(sizeof(*g));
g->parent = parent;
g->reg = reg;
g->shift = shift;
g->clk.ops = &clk_gate_ops;
g->clk.name = name;
g->clk.flags = flags;
g->clk.parent_names = &g->parent;
g->clk.num_parents = 1;
g->flags = clk_gate_flags;
return &g->clk;
}
void clk_gate_free(struct clk *clk_gate)
{
struct clk_gate *g = to_clk_gate(clk_gate);
free(g);
}
struct clk *clk_gate(const char *name, const char *parent, void __iomem *reg,
u8 shift, unsigned flags, u8 clk_gate_flags)
{
struct clk *g;
int ret;
g = clk_gate_alloc(name , parent, reg, shift, flags, clk_gate_flags);
ret = clk_register(g);
if (ret) {
free(to_clk_gate(g));
return ERR_PTR(ret);
}
return g;
}
struct clk *clk_gate_inverted(const char *name, const char *parent,
void __iomem *reg, u8 shift, unsigned flags)
{
return clk_gate(name, parent, reg, shift, flags, CLK_GATE_INVERTED);
}
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