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alistair23-linux/drivers/clk/at91/clk-peripheral.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2013 Boris BREZILLON <b.brezillon@overkiz.com>
*/
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <linux/clkdev.h>
#include <linux/clk/at91_pmc.h>
#include <linux/of.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "pmc.h"
DEFINE_SPINLOCK(pmc_pcr_lock);
#define PERIPHERAL_ID_MIN 2
#define PERIPHERAL_ID_MAX 31
#define PERIPHERAL_MASK(id) (1 << ((id) & PERIPHERAL_ID_MAX))
#define PERIPHERAL_MAX_SHIFT 3
struct clk_peripheral {
struct clk_hw hw;
struct regmap *regmap;
u32 id;
};
#define to_clk_peripheral(hw) container_of(hw, struct clk_peripheral, hw)
struct clk_sam9x5_peripheral {
struct clk_hw hw;
struct regmap *regmap;
struct clk_range range;
spinlock_t *lock;
u32 id;
u32 div;
const struct clk_pcr_layout *layout;
bool auto_div;
};
#define to_clk_sam9x5_peripheral(hw) \
container_of(hw, struct clk_sam9x5_peripheral, hw)
static int clk_peripheral_enable(struct clk_hw *hw)
{
struct clk_peripheral *periph = to_clk_peripheral(hw);
int offset = AT91_PMC_PCER;
u32 id = periph->id;
if (id < PERIPHERAL_ID_MIN)
return 0;
if (id > PERIPHERAL_ID_MAX)
offset = AT91_PMC_PCER1;
regmap_write(periph->regmap, offset, PERIPHERAL_MASK(id));
return 0;
}
static void clk_peripheral_disable(struct clk_hw *hw)
{
struct clk_peripheral *periph = to_clk_peripheral(hw);
int offset = AT91_PMC_PCDR;
u32 id = periph->id;
if (id < PERIPHERAL_ID_MIN)
return;
if (id > PERIPHERAL_ID_MAX)
offset = AT91_PMC_PCDR1;
regmap_write(periph->regmap, offset, PERIPHERAL_MASK(id));
}
static int clk_peripheral_is_enabled(struct clk_hw *hw)
{
struct clk_peripheral *periph = to_clk_peripheral(hw);
int offset = AT91_PMC_PCSR;
unsigned int status;
u32 id = periph->id;
if (id < PERIPHERAL_ID_MIN)
return 1;
if (id > PERIPHERAL_ID_MAX)
offset = AT91_PMC_PCSR1;
regmap_read(periph->regmap, offset, &status);
return status & PERIPHERAL_MASK(id) ? 1 : 0;
}
static const struct clk_ops peripheral_ops = {
.enable = clk_peripheral_enable,
.disable = clk_peripheral_disable,
.is_enabled = clk_peripheral_is_enabled,
};
struct clk_hw * __init
at91_clk_register_peripheral(struct regmap *regmap, const char *name,
const char *parent_name, u32 id)
{
struct clk_peripheral *periph;
struct clk_init_data init;
struct clk_hw *hw;
int ret;
if (!name || !parent_name || id > PERIPHERAL_ID_MAX)
return ERR_PTR(-EINVAL);
periph = kzalloc(sizeof(*periph), GFP_KERNEL);
if (!periph)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &peripheral_ops;
init.parent_names = (parent_name ? &parent_name : NULL);
init.num_parents = (parent_name ? 1 : 0);
init.flags = 0;
periph->id = id;
periph->hw.init = &init;
periph->regmap = regmap;
hw = &periph->hw;
ret = clk_hw_register(NULL, &periph->hw);
if (ret) {
kfree(periph);
hw = ERR_PTR(ret);
}
return hw;
}
static void clk_sam9x5_peripheral_autodiv(struct clk_sam9x5_peripheral *periph)
{
struct clk_hw *parent;
unsigned long parent_rate;
int shift = 0;
if (!periph->auto_div)
return;
if (periph->range.max) {
parent = clk_hw_get_parent_by_index(&periph->hw, 0);
parent_rate = clk_hw_get_rate(parent);
if (!parent_rate)
return;
for (; shift < PERIPHERAL_MAX_SHIFT; shift++) {
if (parent_rate >> shift <= periph->range.max)
break;
}
}
periph->auto_div = false;
periph->div = shift;
}
static int clk_sam9x5_peripheral_enable(struct clk_hw *hw)
{
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
unsigned long flags;
if (periph->id < PERIPHERAL_ID_MIN)
return 0;
spin_lock_irqsave(periph->lock, flags);
regmap_write(periph->regmap, periph->layout->offset,
(periph->id & periph->layout->pid_mask));
regmap_update_bits(periph->regmap, periph->layout->offset,
periph->layout->div_mask | periph->layout->cmd |
AT91_PMC_PCR_EN,
field_prep(periph->layout->div_mask, periph->div) |
periph->layout->cmd |
AT91_PMC_PCR_EN);
spin_unlock_irqrestore(periph->lock, flags);
return 0;
}
static void clk_sam9x5_peripheral_disable(struct clk_hw *hw)
{
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
unsigned long flags;
if (periph->id < PERIPHERAL_ID_MIN)
return;
spin_lock_irqsave(periph->lock, flags);
regmap_write(periph->regmap, periph->layout->offset,
(periph->id & periph->layout->pid_mask));
regmap_update_bits(periph->regmap, periph->layout->offset,
AT91_PMC_PCR_EN | periph->layout->cmd,
periph->layout->cmd);
spin_unlock_irqrestore(periph->lock, flags);
}
static int clk_sam9x5_peripheral_is_enabled(struct clk_hw *hw)
{
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
unsigned long flags;
unsigned int status;
if (periph->id < PERIPHERAL_ID_MIN)
return 1;
spin_lock_irqsave(periph->lock, flags);
regmap_write(periph->regmap, periph->layout->offset,
(periph->id & periph->layout->pid_mask));
regmap_read(periph->regmap, periph->layout->offset, &status);
spin_unlock_irqrestore(periph->lock, flags);
return status & AT91_PMC_PCR_EN ? 1 : 0;
}
static unsigned long
clk_sam9x5_peripheral_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
unsigned long flags;
unsigned int status;
if (periph->id < PERIPHERAL_ID_MIN)
return parent_rate;
spin_lock_irqsave(periph->lock, flags);
regmap_write(periph->regmap, periph->layout->offset,
(periph->id & periph->layout->pid_mask));
regmap_read(periph->regmap, periph->layout->offset, &status);
spin_unlock_irqrestore(periph->lock, flags);
if (status & AT91_PMC_PCR_EN) {
periph->div = field_get(periph->layout->div_mask, status);
periph->auto_div = false;
} else {
clk_sam9x5_peripheral_autodiv(periph);
}
return parent_rate >> periph->div;
}
static long clk_sam9x5_peripheral_round_rate(struct clk_hw *hw,
unsigned long rate,
unsigned long *parent_rate)
{
int shift = 0;
unsigned long best_rate;
unsigned long best_diff;
unsigned long cur_rate = *parent_rate;
unsigned long cur_diff;
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
if (periph->id < PERIPHERAL_ID_MIN || !periph->range.max)
return *parent_rate;
if (periph->range.max) {
for (; shift <= PERIPHERAL_MAX_SHIFT; shift++) {
cur_rate = *parent_rate >> shift;
if (cur_rate <= periph->range.max)
break;
}
}
if (rate >= cur_rate)
return cur_rate;
best_diff = cur_rate - rate;
best_rate = cur_rate;
for (; shift <= PERIPHERAL_MAX_SHIFT; shift++) {
cur_rate = *parent_rate >> shift;
if (cur_rate < rate)
cur_diff = rate - cur_rate;
else
cur_diff = cur_rate - rate;
if (cur_diff < best_diff) {
best_diff = cur_diff;
best_rate = cur_rate;
}
if (!best_diff || cur_rate < rate)
break;
}
return best_rate;
}
static int clk_sam9x5_peripheral_set_rate(struct clk_hw *hw,
unsigned long rate,
unsigned long parent_rate)
{
int shift;
struct clk_sam9x5_peripheral *periph = to_clk_sam9x5_peripheral(hw);
if (periph->id < PERIPHERAL_ID_MIN || !periph->range.max) {
if (parent_rate == rate)
return 0;
else
return -EINVAL;
}
if (periph->range.max && rate > periph->range.max)
return -EINVAL;
for (shift = 0; shift <= PERIPHERAL_MAX_SHIFT; shift++) {
if (parent_rate >> shift == rate) {
periph->auto_div = false;
periph->div = shift;
return 0;
}
}
return -EINVAL;
}
static const struct clk_ops sam9x5_peripheral_ops = {
.enable = clk_sam9x5_peripheral_enable,
.disable = clk_sam9x5_peripheral_disable,
.is_enabled = clk_sam9x5_peripheral_is_enabled,
.recalc_rate = clk_sam9x5_peripheral_recalc_rate,
.round_rate = clk_sam9x5_peripheral_round_rate,
.set_rate = clk_sam9x5_peripheral_set_rate,
};
struct clk_hw * __init
at91_clk_register_sam9x5_peripheral(struct regmap *regmap, spinlock_t *lock,
const struct clk_pcr_layout *layout,
const char *name, const char *parent_name,
u32 id, const struct clk_range *range)
{
struct clk_sam9x5_peripheral *periph;
struct clk_init_data init;
struct clk_hw *hw;
int ret;
if (!name || !parent_name)
return ERR_PTR(-EINVAL);
periph = kzalloc(sizeof(*periph), GFP_KERNEL);
if (!periph)
return ERR_PTR(-ENOMEM);
init.name = name;
init.ops = &sam9x5_peripheral_ops;
init.parent_names = (parent_name ? &parent_name : NULL);
init.num_parents = (parent_name ? 1 : 0);
init.flags = 0;
periph->id = id;
periph->hw.init = &init;
periph->div = 0;
periph->regmap = regmap;
periph->lock = lock;
if (layout->div_mask)
periph->auto_div = true;
periph->layout = layout;
periph->range = *range;
hw = &periph->hw;
ret = clk_hw_register(NULL, &periph->hw);
if (ret) {
kfree(periph);
hw = ERR_PTR(ret);
} else {
clk_sam9x5_peripheral_autodiv(periph);
pmc_register_id(id);
}
return hw;
}
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