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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 <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 PROG_SOURCE_MAX 5
#define PROG_ID_MAX 7
#define PROG_STATUS_MASK(id) (1 << ((id) + 8))
#define PROG_PRES_MASK 0x7
#define PROG_PRES(layout, pckr) ((pckr >> layout->pres_shift) & PROG_PRES_MASK)
#define PROG_MAX_RM9200_CSS 3
struct clk_programmable {
struct clk clk;
struct regmap *regmap;
u8 id;
const struct clk_programmable_layout *layout;
const char *parent_names[PROG_SOURCE_MAX];
};
#define to_clk_programmable(clk) container_of(clk, struct clk_programmable, clk)
static unsigned long clk_programmable_recalc_rate(struct clk *clk,
unsigned long parent_rate)
{
struct clk_programmable *prog = to_clk_programmable(clk);
unsigned int pckr;
regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
return parent_rate >> PROG_PRES(prog->layout, pckr);
}
static int clk_programmable_set_parent(struct clk *clk, u8 index)
{
struct clk_programmable *prog = to_clk_programmable(clk);
const struct clk_programmable_layout *layout = prog->layout;
unsigned int mask = layout->css_mask;
unsigned int pckr = index;
if (layout->have_slck_mck)
mask |= AT91_PMC_CSSMCK_MCK;
if (index > layout->css_mask) {
if (index > PROG_MAX_RM9200_CSS && !layout->have_slck_mck)
return -EINVAL;
pckr |= AT91_PMC_CSSMCK_MCK;
}
regmap_write_bits(prog->regmap, AT91_PMC_PCKR(prog->id), mask, pckr);
return 0;
}
static int clk_programmable_get_parent(struct clk *clk)
{
struct clk_programmable *prog = to_clk_programmable(clk);
const struct clk_programmable_layout *layout = prog->layout;
unsigned int pckr;
u8 ret;
regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
ret = pckr & layout->css_mask;
if (layout->have_slck_mck && (pckr & AT91_PMC_CSSMCK_MCK) && !ret)
ret = PROG_MAX_RM9200_CSS + 1;
return ret;
}
static int clk_programmable_set_rate(struct clk *clk, unsigned long rate,
unsigned long parent_rate)
{
struct clk_programmable *prog = to_clk_programmable(clk);
const struct clk_programmable_layout *layout = prog->layout;
unsigned long div = parent_rate / rate;
unsigned int pckr;
int shift = 0;
regmap_read(prog->regmap, AT91_PMC_PCKR(prog->id), &pckr);
if (!div)
return -EINVAL;
shift = fls(div) - 1;
if (div != (1 << shift))
return -EINVAL;
if (shift >= PROG_PRES_MASK)
return -EINVAL;
regmap_write_bits(prog->regmap, AT91_PMC_PCKR(prog->id),
PROG_PRES_MASK << layout->pres_shift,
shift << layout->pres_shift);
return 0;
}
static const struct clk_ops programmable_ops = {
.recalc_rate = clk_programmable_recalc_rate,
.get_parent = clk_programmable_get_parent,
.set_parent = clk_programmable_set_parent,
.set_rate = clk_programmable_set_rate,
};
struct clk *
at91_clk_register_programmable(struct regmap *regmap,
const char *name, const char **parent_names,
u8 num_parents, u8 id,
const struct clk_programmable_layout *layout)
{
struct clk_programmable *prog;
int ret;
if (id > PROG_ID_MAX)
return ERR_PTR(-EINVAL);
prog = kzalloc(sizeof(*prog), GFP_KERNEL);
if (!prog)
return ERR_PTR(-ENOMEM);
prog->clk.name = name;
prog->clk.ops = &programmable_ops;
memcpy(prog->parent_names, parent_names,
num_parents * sizeof(prog->parent_names[0]));
prog->clk.parent_names = &prog->parent_names[0];
prog->clk.num_parents = num_parents;
/* init.flags = CLK_SET_RATE_GATE | CLK_SET_PARENT_GATE; */
prog->id = id;
prog->layout = layout;
prog->regmap = regmap;
ret = clk_register(&prog->clk);
if (ret) {
kfree(prog);
return ERR_PTR(ret);
}
return &prog->clk;
}
const struct clk_programmable_layout at91rm9200_programmable_layout = {
.pres_shift = 2,
.css_mask = 0x3,
.have_slck_mck = 0,
};
const struct clk_programmable_layout at91sam9g45_programmable_layout = {
.pres_shift = 2,
.css_mask = 0x3,
.have_slck_mck = 1,
};
const struct clk_programmable_layout at91sam9x5_programmable_layout = {
.pres_shift = 4,
.css_mask = 0x7,
.have_slck_mck = 0,
};
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