linux/drivers/clk/at91/clk-master.c

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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 <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/io.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include "pmc.h"
#define MASTER_SOURCE_MAX 4
#define MASTER_PRES_MASK 0x7
#define MASTER_PRES_MAX MASTER_PRES_MASK
#define MASTER_DIV_SHIFT 8
#define MASTER_DIV_MASK 0x3
struct clk_master_characteristics {
struct clk_range output;
u32 divisors[4];
u8 have_div3_pres;
};
struct clk_master_layout {
u32 mask;
u8 pres_shift;
};
#define to_clk_master(hw) container_of(hw, struct clk_master, hw)
struct clk_master {
struct clk_hw hw;
struct at91_pmc *pmc;
unsigned int irq;
wait_queue_head_t wait;
const struct clk_master_layout *layout;
const struct clk_master_characteristics *characteristics;
};
static irqreturn_t clk_master_irq_handler(int irq, void *dev_id)
{
struct clk_master *master = (struct clk_master *)dev_id;
wake_up(&master->wait);
disable_irq_nosync(master->irq);
return IRQ_HANDLED;
}
static int clk_master_prepare(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
struct at91_pmc *pmc = master->pmc;
while (!(pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY)) {
enable_irq(master->irq);
wait_event(master->wait,
pmc_read(pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
}
return 0;
}
static int clk_master_is_prepared(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
return !!(pmc_read(master->pmc, AT91_PMC_SR) & AT91_PMC_MCKRDY);
}
static unsigned long clk_master_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
u8 pres;
u8 div;
unsigned long rate = parent_rate;
struct clk_master *master = to_clk_master(hw);
struct at91_pmc *pmc = master->pmc;
const struct clk_master_layout *layout = master->layout;
const struct clk_master_characteristics *characteristics =
master->characteristics;
u32 tmp;
pmc_lock(pmc);
tmp = pmc_read(pmc, AT91_PMC_MCKR) & layout->mask;
pmc_unlock(pmc);
pres = (tmp >> layout->pres_shift) & MASTER_PRES_MASK;
div = (tmp >> MASTER_DIV_SHIFT) & MASTER_DIV_MASK;
if (characteristics->have_div3_pres && pres == MASTER_PRES_MAX)
rate /= 3;
else
rate >>= pres;
rate /= characteristics->divisors[div];
if (rate < characteristics->output.min)
pr_warn("master clk is underclocked");
else if (rate > characteristics->output.max)
pr_warn("master clk is overclocked");
return rate;
}
static u8 clk_master_get_parent(struct clk_hw *hw)
{
struct clk_master *master = to_clk_master(hw);
struct at91_pmc *pmc = master->pmc;
return pmc_read(pmc, AT91_PMC_MCKR) & AT91_PMC_CSS;
}
static const struct clk_ops master_ops = {
.prepare = clk_master_prepare,
.is_prepared = clk_master_is_prepared,
.recalc_rate = clk_master_recalc_rate,
.get_parent = clk_master_get_parent,
};
static struct clk * __init
at91_clk_register_master(struct at91_pmc *pmc, unsigned int irq,
const char *name, int num_parents,
const char **parent_names,
const struct clk_master_layout *layout,
const struct clk_master_characteristics *characteristics)
{
int ret;
struct clk_master *master;
struct clk *clk = NULL;
struct clk_init_data init;
if (!pmc || !irq || !name || !num_parents || !parent_names)
return ERR_PTR(-EINVAL);
master = kzalloc(sizeof(*master), GFP_KERNEL);
if (!master)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &master_ops;
init.parent_names = parent_names;
init.num_parents = num_parents;
init.flags = 0;
master->hw.init = &init;
master->layout = layout;
master->characteristics = characteristics;
master->pmc = pmc;
master->irq = irq;
init_waitqueue_head(&master->wait);
irq_set_status_flags(master->irq, IRQ_NOAUTOEN);
ret = request_irq(master->irq, clk_master_irq_handler,
IRQF_TRIGGER_HIGH, "clk-master", master);
if (ret)
return ERR_PTR(ret);
clk = clk_register(NULL, &master->hw);
if (IS_ERR(clk))
kfree(master);
return clk;
}
static const struct clk_master_layout at91rm9200_master_layout = {
.mask = 0x31F,
.pres_shift = 2,
};
static const struct clk_master_layout at91sam9x5_master_layout = {
.mask = 0x373,
.pres_shift = 4,
};
static struct clk_master_characteristics * __init
of_at91_clk_master_get_characteristics(struct device_node *np)
{
struct clk_master_characteristics *characteristics;
characteristics = kzalloc(sizeof(*characteristics), GFP_KERNEL);
if (!characteristics)
return NULL;
if (of_at91_get_clk_range(np, "atmel,clk-output-range", &characteristics->output))
goto out_free_characteristics;
of_property_read_u32_array(np, "atmel,clk-divisors",
characteristics->divisors, 4);
characteristics->have_div3_pres =
of_property_read_bool(np, "atmel,master-clk-have-div3-pres");
return characteristics;
out_free_characteristics:
kfree(characteristics);
return NULL;
}
static void __init
of_at91_clk_master_setup(struct device_node *np, struct at91_pmc *pmc,
const struct clk_master_layout *layout)
{
struct clk *clk;
int num_parents;
int i;
unsigned int irq;
const char *parent_names[MASTER_SOURCE_MAX];
const char *name = np->name;
struct clk_master_characteristics *characteristics;
num_parents = of_count_phandle_with_args(np, "clocks", "#clock-cells");
if (num_parents <= 0 || num_parents > MASTER_SOURCE_MAX)
return;
for (i = 0; i < num_parents; ++i) {
parent_names[i] = of_clk_get_parent_name(np, i);
if (!parent_names[i])
return;
}
of_property_read_string(np, "clock-output-names", &name);
characteristics = of_at91_clk_master_get_characteristics(np);
if (!characteristics)
return;
irq = irq_of_parse_and_map(np, 0);
if (!irq)
goto out_free_characteristics;
clk = at91_clk_register_master(pmc, irq, name, num_parents,
parent_names, layout,
characteristics);
if (IS_ERR(clk))
goto out_free_characteristics;
of_clk_add_provider(np, of_clk_src_simple_get, clk);
return;
out_free_characteristics:
kfree(characteristics);
}
void __init of_at91rm9200_clk_master_setup(struct device_node *np,
struct at91_pmc *pmc)
{
of_at91_clk_master_setup(np, pmc, &at91rm9200_master_layout);
}
void __init of_at91sam9x5_clk_master_setup(struct device_node *np,
struct at91_pmc *pmc)
{
of_at91_clk_master_setup(np, pmc, &at91sam9x5_master_layout);
}