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/*
* clk-gate2.c - barebox 2-bit clock support. Based on Linux clk support
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include <common.h>
#include <io.h>
#include <malloc.h>
#include <linux/clk.h>
#include <linux/err.h>
#include "clk.h"
struct clk_gate2 {
struct clk clk;
void __iomem *reg;
int shift;
u8 cgr_val;
const char *parent;
#define CLK_GATE_INVERTED (1 << 0)
unsigned flags;
};
#define to_clk_gate2(_clk) container_of(_clk, struct clk_gate2, clk)
static int clk_gate2_enable(struct clk *clk)
{
struct clk_gate2 *g = to_clk_gate2(clk);
u32 val;
val = readl(g->reg);
if (g->flags & CLK_GATE_INVERTED)
val &= ~(3 << g->shift);
else
val |= g->cgr_val << g->shift;
writel(val, g->reg);
return 0;
}
static void clk_gate2_disable(struct clk *clk)
{
struct clk_gate2 *g = to_clk_gate2(clk);
u32 val;
val = readl(g->reg);
if (g->flags & CLK_GATE_INVERTED)
val |= 3 << g->shift;
else
val &= ~(3 << g->shift);
writel(val, g->reg);
}
static int clk_gate2_is_enabled(struct clk *clk)
{
struct clk_gate2 *g = to_clk_gate2(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;
}
static struct clk_ops clk_gate2_ops = {
.set_rate = clk_parent_set_rate,
.round_rate = clk_parent_round_rate,
.enable = clk_gate2_enable,
.disable = clk_gate2_disable,
.is_enabled = clk_gate2_is_enabled,
};
static struct clk *clk_gate2_alloc(const char *name, const char *parent,
void __iomem *reg, u8 shift, u8 cgr_val,
unsigned long flags)
{
struct clk_gate2 *g = xzalloc(sizeof(*g));
g->parent = parent;
g->reg = reg;
g->cgr_val = cgr_val;
g->shift = shift;
g->clk.ops = &clk_gate2_ops;
g->clk.name = name;
g->clk.parent_names = &g->parent;
g->clk.num_parents = 1;
g->clk.flags = CLK_SET_RATE_PARENT | flags;
return &g->clk;
}
struct clk *clk_gate2(const char *name, const char *parent, void __iomem *reg,
u8 shift, u8 cgr_val, unsigned long flags)
{
struct clk *g;
int ret;
g = clk_gate2_alloc(name , parent, reg, shift, cgr_val, flags);
ret = clk_register(g);
if (ret) {
free(to_clk_gate2(g));
return ERR_PTR(ret);
}
return g;
}
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