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/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*
* 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.
*
*/
#include <common.h>
#include <clock.h>
#include <of.h>
#include <io.h>
#include <linux/list.h>
#include <linux/clk.h>
#include <linux/clk/at91_pmc.h>
#include <mfd/syscon.h>
#include <regmap.h>
#include "pmc.h"
#define SYSTEM_MAX_ID 31
#define SYSTEM_MAX_NAME_SZ 32
#define to_clk_system(clk) container_of(clk, struct clk_system, clk)
struct clk_system {
struct clk clk;
struct regmap *regmap;
u8 id;
const char *parent_name;
};
static inline int is_pck(int id)
{
return (id >= 8) && (id <= 15);
}
static inline bool clk_system_ready(struct regmap *regmap, int id)
{
unsigned int status;
regmap_read(regmap, AT91_PMC_SR, &status);
return status & (1 << id) ? 1 : 0;
}
static int clk_system_enable(struct clk *clk)
{
struct clk_system *sys = to_clk_system(clk);
regmap_write(sys->regmap, AT91_PMC_SCER, 1 << sys->id);
if (!is_pck(sys->id))
return 0;
while (!clk_system_ready(sys->regmap, sys->id))
barrier();
return 0;
}
static void clk_system_disable(struct clk *clk)
{
struct clk_system *sys = to_clk_system(clk);
regmap_write(sys->regmap, AT91_PMC_SCDR, 1 << sys->id);
}
static int clk_system_is_enabled(struct clk *clk)
{
struct clk_system *sys = to_clk_system(clk);
unsigned int status;
regmap_read(sys->regmap, AT91_PMC_SCSR, &status);
if (!(status & (1 << sys->id)))
return 0;
if (!is_pck(sys->id))
return 1;
regmap_read(sys->regmap, AT91_PMC_SR, &status);
return status & (1 << sys->id) ? 1 : 0;
}
static const struct clk_ops system_ops = {
.enable = clk_system_enable,
.disable = clk_system_disable,
.is_enabled = clk_system_is_enabled,
};
static struct clk *
at91_clk_register_system(struct regmap *regmap, const char *name,
const char *parent_name, u8 id)
{
struct clk_system *sys;
int ret;
if (!parent_name || id > SYSTEM_MAX_ID)
return ERR_PTR(-EINVAL);
sys = xzalloc(sizeof(*sys));
sys->clk.name = name;
sys->clk.ops = &system_ops;
sys->parent_name = parent_name;
sys->clk.parent_names = &sys->parent_name;
sys->clk.num_parents = 1;
/* init.flags = CLK_SET_RATE_PARENT; */
sys->id = id;
sys->regmap = regmap;
ret = clk_register(&sys->clk);
if (ret) {
kfree(sys);
return ERR_PTR(ret);
}
return &sys->clk;
}
static int of_at91rm9200_clk_sys_setup(struct device_node *np)
{
int num;
u32 id;
struct clk *clk;
const char *name;
struct device_node *sysclknp;
const char *parent_name;
struct regmap *regmap;
num = of_get_child_count(np);
if (num > (SYSTEM_MAX_ID + 1))
return -EINVAL;
regmap = syscon_node_to_regmap(of_get_parent(np));
if (IS_ERR(regmap))
return PTR_ERR(regmap);
for_each_child_of_node(np, sysclknp) {
if (of_property_read_u32(sysclknp, "reg", &id))
continue;
if (of_property_read_string(np, "clock-output-names", &name))
name = sysclknp->name;
parent_name = of_clk_get_parent_name(sysclknp, 0);
clk = at91_clk_register_system(regmap, name, parent_name, id);
if (IS_ERR(clk))
continue;
of_clk_add_provider(sysclknp, of_clk_src_simple_get, clk);
}
return 0;
}
CLK_OF_DECLARE(at91rm9200_clk_sys, "atmel,at91rm9200-clk-system",
of_at91rm9200_clk_sys_setup);
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