Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

3 Commits   0 Branches   0 Tags   |
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2011 Sascha Hauer, Pengutronix <s.hauer@pengutronix.de>
* Copyright (C) 2011 Richard Zhao, Linaro <richard.zhao@linaro.org>
* Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@linaro.org>
*
* Adjustable divider clock implementation
*/
#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/log2.h>
/*
* DOC: basic adjustable divider clock that cannot gate
*
* Traits of this clock:
* prepare - clk_prepare only ensures that parents are prepared
* enable - clk_enable only ensures that parents are enabled
* rate - rate is adjustable. clk->rate = ceiling(parent->rate / divisor)
* parent - fixed parent. No clk_set_parent support
*/
static inline u32 clk_div_readl(struct clk_divider *divider)
{
<------>if (divider->flags & CLK_DIVIDER_BIG_ENDIAN)
<------><------>return ioread32be(divider->reg);
<------>return readl(divider->reg);
}
static inline void clk_div_writel(struct clk_divider *divider, u32 val)
{
<------>if (divider->flags & CLK_DIVIDER_BIG_ENDIAN)
<------><------>iowrite32be(val, divider->reg);
<------>else
<------><------>writel(val, divider->reg);
}
static unsigned int _get_table_maxdiv(const struct clk_div_table *table,
<------><------><------><------> u8 width)
{
<------>unsigned int maxdiv = 0, mask = clk_div_mask(width);
<------>const struct clk_div_table *clkt;
<------>for (clkt = table; clkt->div; clkt++)
<------><------>if (clkt->div > maxdiv && clkt->val <= mask)
<------><------><------>maxdiv = clkt->div;
<------>return maxdiv;
}
static unsigned int _get_table_mindiv(const struct clk_div_table *table)
{
<------>unsigned int mindiv = UINT_MAX;
<------>const struct clk_div_table *clkt;
<------>for (clkt = table; clkt->div; clkt++)
<------><------>if (clkt->div < mindiv)
<------><------><------>mindiv = clkt->div;
<------>return mindiv;
}
static unsigned int _get_maxdiv(const struct clk_div_table *table, u8 width,
<------><------><------><------>unsigned long flags)
{
<------>if (flags & CLK_DIVIDER_ONE_BASED)
<------><------>return clk_div_mask(width);
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>return 1 << clk_div_mask(width);
<------>if (table)
<------><------>return _get_table_maxdiv(table, width);
<------>return clk_div_mask(width) + 1;
}
static unsigned int _get_table_div(const struct clk_div_table *table,
<------><------><------><------><------><------><------>unsigned int val)
{
<------>const struct clk_div_table *clkt;
<------>for (clkt = table; clkt->div; clkt++)
<------><------>if (clkt->val == val)
<------><------><------>return clkt->div;
<------>return 0;
}
static unsigned int _get_div(const struct clk_div_table *table,
<------><------><------> unsigned int val, unsigned long flags, u8 width)
{
<------>if (flags & CLK_DIVIDER_ONE_BASED)
<------><------>return val;
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>return 1 << val;
<------>if (flags & CLK_DIVIDER_MAX_AT_ZERO)
<------><------>return val ? val : clk_div_mask(width) + 1;
<------>if (table)
<------><------>return _get_table_div(table, val);
<------>return val + 1;
}
static unsigned int _get_table_val(const struct clk_div_table *table,
<------><------><------><------><------><------><------>unsigned int div)
{
<------>const struct clk_div_table *clkt;
<------>for (clkt = table; clkt->div; clkt++)
<------><------>if (clkt->div == div)
<------><------><------>return clkt->val;
<------>return 0;
}
static unsigned int _get_val(const struct clk_div_table *table,
<------><------><------> unsigned int div, unsigned long flags, u8 width)
{
<------>if (flags & CLK_DIVIDER_ONE_BASED)
<------><------>return div;
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>return __ffs(div);
<------>if (flags & CLK_DIVIDER_MAX_AT_ZERO)
<------><------>return (div == clk_div_mask(width) + 1) ? 0 : div;
<------>if (table)
<------><------>return _get_table_val(table, div);
<------>return div - 1;
}
unsigned long divider_recalc_rate(struct clk_hw *hw, unsigned long parent_rate,
<------><------><------><------> unsigned int val,
<------><------><------><------> const struct clk_div_table *table,
<------><------><------><------> unsigned long flags, unsigned long width)
{
<------>unsigned int div;
<------>div = _get_div(table, val, flags, width);
<------>if (!div) {
<------><------>WARN(!(flags & CLK_DIVIDER_ALLOW_ZERO),
<------><------><------>"%s: Zero divisor and CLK_DIVIDER_ALLOW_ZERO not set\n",
<------><------><------>clk_hw_get_name(hw));
<------><------>return parent_rate;
<------>}
<------>return DIV_ROUND_UP_ULL((u64)parent_rate, div);
}
EXPORT_SYMBOL_GPL(divider_recalc_rate);
static unsigned long clk_divider_recalc_rate(struct clk_hw *hw,
<------><------>unsigned long parent_rate)
{
<------>struct clk_divider *divider = to_clk_divider(hw);
<------>unsigned int val;
<------>val = clk_div_readl(divider) >> divider->shift;
<------>val &= clk_div_mask(divider->width);
<------>return divider_recalc_rate(hw, parent_rate, val, divider->table,
<------><------><------><------> divider->flags, divider->width);
}
static bool _is_valid_table_div(const struct clk_div_table *table,
<------><------><------><------><------><------><------> unsigned int div)
{
<------>const struct clk_div_table *clkt;
<------>for (clkt = table; clkt->div; clkt++)
<------><------>if (clkt->div == div)
<------><------><------>return true;
<------>return false;
}
static bool _is_valid_div(const struct clk_div_table *table, unsigned int div,
<------><------><------> unsigned long flags)
{
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>return is_power_of_2(div);
<------>if (table)
<------><------>return _is_valid_table_div(table, div);
<------>return true;
}
static int _round_up_table(const struct clk_div_table *table, int div)
{
<------>const struct clk_div_table *clkt;
<------>int up = INT_MAX;
<------>for (clkt = table; clkt->div; clkt++) {
<------><------>if (clkt->div == div)
<------><------><------>return clkt->div;
<------><------>else if (clkt->div < div)
<------><------><------>continue;
<------><------>if ((clkt->div - div) < (up - div))
<------><------><------>up = clkt->div;
<------>}
<------>return up;
}
static int _round_down_table(const struct clk_div_table *table, int div)
{
<------>const struct clk_div_table *clkt;
<------>int down = _get_table_mindiv(table);
<------>for (clkt = table; clkt->div; clkt++) {
<------><------>if (clkt->div == div)
<------><------><------>return clkt->div;
<------><------>else if (clkt->div > div)
<------><------><------>continue;
<------><------>if ((div - clkt->div) < (div - down))
<------><------><------>down = clkt->div;
<------>}
<------>return down;
}
static int _div_round_up(const struct clk_div_table *table,
<------><------><------> unsigned long parent_rate, unsigned long rate,
<------><------><------> unsigned long flags)
{
<------>int div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>div = __roundup_pow_of_two(div);
<------>if (table)
<------><------>div = _round_up_table(table, div);
<------>return div;
}
static int _div_round_closest(const struct clk_div_table *table,
<------><------><------> unsigned long parent_rate, unsigned long rate,
<------><------><------> unsigned long flags)
{
<------>int up, down;
<------>unsigned long up_rate, down_rate;
<------>up = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
<------>down = parent_rate / rate;
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO) {
<------><------>up = __roundup_pow_of_two(up);
<------><------>down = __rounddown_pow_of_two(down);
<------>} else if (table) {
<------><------>up = _round_up_table(table, up);
<------><------>down = _round_down_table(table, down);
<------>}
<------>up_rate = DIV_ROUND_UP_ULL((u64)parent_rate, up);
<------>down_rate = DIV_ROUND_UP_ULL((u64)parent_rate, down);
<------>return (rate - up_rate) <= (down_rate - rate) ? up : down;
}
static int _div_round(const struct clk_div_table *table,
<------><------> unsigned long parent_rate, unsigned long rate,
<------><------> unsigned long flags)
{
<------>if (flags & CLK_DIVIDER_ROUND_CLOSEST)
<------><------>return _div_round_closest(table, parent_rate, rate, flags);
<------>return _div_round_up(table, parent_rate, rate, flags);
}
static bool _is_best_div(unsigned long rate, unsigned long now,
<------><------><------> unsigned long best, unsigned long flags)
{
<------>if (flags & CLK_DIVIDER_ROUND_CLOSEST)
<------><------>return abs(rate - now) < abs(rate - best);
<------>return now <= rate && now > best;
}
static int _next_div(const struct clk_div_table *table, int div,
<------><------> unsigned long flags)
{
<------>div++;
<------>if (flags & CLK_DIVIDER_POWER_OF_TWO)
<------><------>return __roundup_pow_of_two(div);
<------>if (table)
<------><------>return _round_up_table(table, div);
<------>return div;
}
static int clk_divider_bestdiv(struct clk_hw *hw, struct clk_hw *parent,
<------><------><------> unsigned long rate,
<------><------><------> unsigned long *best_parent_rate,
<------><------><------> const struct clk_div_table *table, u8 width,
<------><------><------> unsigned long flags)
{
<------>int i, bestdiv = 0;
<------>unsigned long parent_rate, best = 0, now, maxdiv;
<------>unsigned long parent_rate_saved = *best_parent_rate;
<------>if (!rate)
<------><------>rate = 1;
<------>maxdiv = _get_maxdiv(table, width, flags);
<------>if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
<------><------>parent_rate = *best_parent_rate;
<------><------>bestdiv = _div_round(table, parent_rate, rate, flags);
<------><------>bestdiv = bestdiv == 0 ? 1 : bestdiv;
<------><------>bestdiv = bestdiv > maxdiv ? maxdiv : bestdiv;
<------><------>return bestdiv;
<------>}
<------>/*
<------> * The maximum divider we can use without overflowing
<------> * unsigned long in rate * i below
<------> */
<------>maxdiv = min(ULONG_MAX / rate, maxdiv);
<------>for (i = _next_div(table, 0, flags); i <= maxdiv;
<------><------><------><------><------> i = _next_div(table, i, flags)) {
<------><------>if (rate * i == parent_rate_saved) {
<------><------><------>/*
<------><------><------> * It's the most ideal case if the requested rate can be
<------><------><------> * divided from parent clock without needing to change
<------><------><------> * parent rate, so return the divider immediately.
<------><------><------> */
<------><------><------>*best_parent_rate = parent_rate_saved;
<------><------><------>return i;
<------><------>}
<------><------>parent_rate = clk_hw_round_rate(parent, rate * i);
<------><------>now = DIV_ROUND_UP_ULL((u64)parent_rate, i);
<------><------>if (_is_best_div(rate, now, best, flags)) {
<------><------><------>bestdiv = i;
<------><------><------>best = now;
<------><------><------>*best_parent_rate = parent_rate;
<------><------>}
<------>}
<------>if (!bestdiv) {
<------><------>bestdiv = _get_maxdiv(table, width, flags);
<------><------>*best_parent_rate = clk_hw_round_rate(parent, 1);
<------>}
<------>return bestdiv;
}
long divider_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
<------><------><------> unsigned long rate, unsigned long *prate,
<------><------><------> const struct clk_div_table *table,
<------><------><------> u8 width, unsigned long flags)
{
<------>int div;
<------>div = clk_divider_bestdiv(hw, parent, rate, prate, table, width, flags);
<------>return DIV_ROUND_UP_ULL((u64)*prate, div);
}
EXPORT_SYMBOL_GPL(divider_round_rate_parent);
long divider_ro_round_rate_parent(struct clk_hw *hw, struct clk_hw *parent,
<------><------><------><------> unsigned long rate, unsigned long *prate,
<------><------><------><------> const struct clk_div_table *table, u8 width,
<------><------><------><------> unsigned long flags, unsigned int val)
{
<------>int div;
<------>div = _get_div(table, val, flags, width);
<------>/* Even a read-only clock can propagate a rate change */
<------>if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
<------><------>if (!parent)
<------><------><------>return -EINVAL;
<------><------>*prate = clk_hw_round_rate(parent, rate * div);
<------>}
<------>return DIV_ROUND_UP_ULL((u64)*prate, div);
}
EXPORT_SYMBOL_GPL(divider_ro_round_rate_parent);
static long clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
<------><------><------><------>unsigned long *prate)
{
<------>struct clk_divider *divider = to_clk_divider(hw);
<------>/* if read only, just return current value */
<------>if (divider->flags & CLK_DIVIDER_READ_ONLY) {
<------><------>u32 val;
<------><------>val = clk_div_readl(divider) >> divider->shift;
<------><------>val &= clk_div_mask(divider->width);
<------><------>return divider_ro_round_rate(hw, rate, prate, divider->table,
<------><------><------><------><------> divider->width, divider->flags,
<------><------><------><------><------> val);
<------>}
<------>return divider_round_rate(hw, rate, prate, divider->table,
<------><------><------><------> divider->width, divider->flags);
}
int divider_get_val(unsigned long rate, unsigned long parent_rate,
<------><------> const struct clk_div_table *table, u8 width,
<------><------> unsigned long flags)
{
<------>unsigned int div, value;
<------>div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
<------>if (!_is_valid_div(table, div, flags))
<------><------>return -EINVAL;
<------>value = _get_val(table, div, flags, width);
<------>return min_t(unsigned int, value, clk_div_mask(width));
}
EXPORT_SYMBOL_GPL(divider_get_val);
static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
<------><------><------><------>unsigned long parent_rate)
{
<------>struct clk_divider *divider = to_clk_divider(hw);
<------>int value;
<------>unsigned long flags = 0;
<------>u32 val;
<------>value = divider_get_val(rate, parent_rate, divider->table,
<------><------><------><------>divider->width, divider->flags);
<------>if (value < 0)
<------><------>return value;
<------>if (divider->lock)
<------><------>spin_lock_irqsave(divider->lock, flags);
<------>else
<------><------>__acquire(divider->lock);
<------>if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
<------><------>val = clk_div_mask(divider->width) << (divider->shift + 16);
<------>} else {
<------><------>val = clk_div_readl(divider);
<------><------>val &= ~(clk_div_mask(divider->width) << divider->shift);
<------>}
<------>val |= (u32)value << divider->shift;
<------>clk_div_writel(divider, val);
<------>if (divider->lock)
<------><------>spin_unlock_irqrestore(divider->lock, flags);
<------>else
<------><------>__release(divider->lock);
<------>return 0;
}
const struct clk_ops clk_divider_ops = {
<------>.recalc_rate = clk_divider_recalc_rate,
<------>.round_rate = clk_divider_round_rate,
<------>.set_rate = clk_divider_set_rate,
};
EXPORT_SYMBOL_GPL(clk_divider_ops);
const struct clk_ops clk_divider_ro_ops = {
<------>.recalc_rate = clk_divider_recalc_rate,
<------>.round_rate = clk_divider_round_rate,
};
EXPORT_SYMBOL_GPL(clk_divider_ro_ops);
struct clk_hw *__clk_hw_register_divider(struct device *dev,
<------><------>struct device_node *np, const char *name,
<------><------>const char *parent_name, const struct clk_hw *parent_hw,
<------><------>const struct clk_parent_data *parent_data, unsigned long flags,
<------><------>void __iomem *reg, u8 shift, u8 width, u8 clk_divider_flags,
<------><------>const struct clk_div_table *table, spinlock_t *lock)
{
<------>struct clk_divider *div;
<------>struct clk_hw *hw;
<------>struct clk_init_data init = {};
<------>int ret;
<------>if (clk_divider_flags & CLK_DIVIDER_HIWORD_MASK) {
<------><------>if (width + shift > 16) {
<------><------><------>pr_warn("divider value exceeds LOWORD field\n");
<------><------><------>return ERR_PTR(-EINVAL);
<------><------>}
<------>}
<------>/* allocate the divider */
<------>div = kzalloc(sizeof(*div), GFP_KERNEL);
<------>if (!div)
<------><------>return ERR_PTR(-ENOMEM);
<------>init.name = name;
<------>if (clk_divider_flags & CLK_DIVIDER_READ_ONLY)
<------><------>init.ops = &clk_divider_ro_ops;
<------>else
<------><------>init.ops = &clk_divider_ops;
<------>init.flags = flags;
<------>init.parent_names = parent_name ? &parent_name : NULL;
<------>init.parent_hws = parent_hw ? &parent_hw : NULL;
<------>init.parent_data = parent_data;
<------>if (parent_name || parent_hw || parent_data)
<------><------>init.num_parents = 1;
<------>else
<------><------>init.num_parents = 0;
<------>/* struct clk_divider assignments */
<------>div->reg = reg;
<------>div->shift = shift;
<------>div->width = width;
<------>div->flags = clk_divider_flags;
<------>div->lock = lock;
<------>div->hw.init = &init;
<------>div->table = table;
<------>/* register the clock */
<------>hw = &div->hw;
<------>ret = clk_hw_register(dev, hw);
<------>if (ret) {
<------><------>kfree(div);
<------><------>hw = ERR_PTR(ret);
<------>}
<------>return hw;
}
EXPORT_SYMBOL_GPL(__clk_hw_register_divider);
/**
* clk_register_divider_table - register a table based divider clock with
* the clock framework
* @dev: device registering this clock
* @name: name of this clock
* @parent_name: name of clock's parent
* @flags: framework-specific flags
* @reg: register address to adjust divider
* @shift: number of bits to shift the bitfield
* @width: width of the bitfield
* @clk_divider_flags: divider-specific flags for this clock
* @table: array of divider/value pairs ending with a div set to 0
* @lock: shared register lock for this clock
*/
struct clk *clk_register_divider_table(struct device *dev, const char *name,
<------><------>const char *parent_name, unsigned long flags,
<------><------>void __iomem *reg, u8 shift, u8 width,
<------><------>u8 clk_divider_flags, const struct clk_div_table *table,
<------><------>spinlock_t *lock)
{
<------>struct clk_hw *hw;
<------>hw = __clk_hw_register_divider(dev, NULL, name, parent_name, NULL,
<------><------><------>NULL, flags, reg, shift, width, clk_divider_flags,
<------><------><------>table, lock);
<------>if (IS_ERR(hw))
<------><------>return ERR_CAST(hw);
<------>return hw->clk;
}
EXPORT_SYMBOL_GPL(clk_register_divider_table);
void clk_unregister_divider(struct clk *clk)
{
<------>struct clk_divider *div;
<------>struct clk_hw *hw;
<------>hw = __clk_get_hw(clk);
<------>if (!hw)
<------><------>return;
<------>div = to_clk_divider(hw);
<------>clk_unregister(clk);
<------>kfree(div);
}
EXPORT_SYMBOL_GPL(clk_unregister_divider);
/**
* clk_hw_unregister_divider - unregister a clk divider
* @hw: hardware-specific clock data to unregister
*/
void clk_hw_unregister_divider(struct clk_hw *hw)
{
<------>struct clk_divider *div;
<------>div = to_clk_divider(hw);
<------>clk_hw_unregister(hw);
<------>kfree(div);
}
EXPORT_SYMBOL_GPL(clk_hw_unregister_divider);