mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 09:19:51 +00:00
![Kees Cook](/assets/img/avatar_default.png)
The kzalloc() function has a 2-factor argument form, kcalloc(). This patch replaces cases of: kzalloc(a * b, gfp) with: kcalloc(a * b, gfp) as well as handling cases of: kzalloc(a * b * c, gfp) with: kzalloc(array3_size(a, b, c), gfp) as it's slightly less ugly than: kzalloc_array(array_size(a, b), c, gfp) This does, however, attempt to ignore constant size factors like: kzalloc(4 * 1024, gfp) though any constants defined via macros get caught up in the conversion. Any factors with a sizeof() of "unsigned char", "char", and "u8" were dropped, since they're redundant. The Coccinelle script used for this was: // Fix redundant parens around sizeof(). @@ type TYPE; expression THING, E; @@ ( kzalloc( - (sizeof(TYPE)) * E + sizeof(TYPE) * E , ...) | kzalloc( - (sizeof(THING)) * E + sizeof(THING) * E , ...) ) // Drop single-byte sizes and redundant parens. @@ expression COUNT; typedef u8; typedef __u8; @@ ( kzalloc( - sizeof(u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(__u8) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(unsigned char) * (COUNT) + COUNT , ...) | kzalloc( - sizeof(u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(__u8) * COUNT + COUNT , ...) | kzalloc( - sizeof(char) * COUNT + COUNT , ...) | kzalloc( - sizeof(unsigned char) * COUNT + COUNT , ...) ) // 2-factor product with sizeof(type/expression) and identifier or constant. @@ type TYPE; expression THING; identifier COUNT_ID; constant COUNT_CONST; @@ ( - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_ID) + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_ID + COUNT_ID, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (COUNT_CONST) + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * COUNT_CONST + COUNT_CONST, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_ID) + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_ID + COUNT_ID, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (COUNT_CONST) + COUNT_CONST, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * COUNT_CONST + COUNT_CONST, sizeof(THING) , ...) ) // 2-factor product, only identifiers. @@ identifier SIZE, COUNT; @@ - kzalloc + kcalloc ( - SIZE * COUNT + COUNT, SIZE , ...) // 3-factor product with 1 sizeof(type) or sizeof(expression), with // redundant parens removed. @@ expression THING; identifier STRIDE, COUNT; type TYPE; @@ ( kzalloc( - sizeof(TYPE) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(TYPE) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(TYPE)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * (COUNT) * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * (STRIDE) + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) | kzalloc( - sizeof(THING) * COUNT * STRIDE + array3_size(COUNT, STRIDE, sizeof(THING)) , ...) ) // 3-factor product with 2 sizeof(variable), with redundant parens removed. @@ expression THING1, THING2; identifier COUNT; type TYPE1, TYPE2; @@ ( kzalloc( - sizeof(TYPE1) * sizeof(TYPE2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(THING1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(THING1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * COUNT + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) | kzalloc( - sizeof(TYPE1) * sizeof(THING2) * (COUNT) + array3_size(COUNT, sizeof(TYPE1), sizeof(THING2)) , ...) ) // 3-factor product, only identifiers, with redundant parens removed. @@ identifier STRIDE, SIZE, COUNT; @@ ( kzalloc( - (COUNT) * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * STRIDE * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - (COUNT) * (STRIDE) * (SIZE) + array3_size(COUNT, STRIDE, SIZE) , ...) | kzalloc( - COUNT * STRIDE * SIZE + array3_size(COUNT, STRIDE, SIZE) , ...) ) // Any remaining multi-factor products, first at least 3-factor products, // when they're not all constants... @@ expression E1, E2, E3; constant C1, C2, C3; @@ ( kzalloc(C1 * C2 * C3, ...) | kzalloc( - (E1) * E2 * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * E3 + array3_size(E1, E2, E3) , ...) | kzalloc( - (E1) * (E2) * (E3) + array3_size(E1, E2, E3) , ...) | kzalloc( - E1 * E2 * E3 + array3_size(E1, E2, E3) , ...) ) // And then all remaining 2 factors products when they're not all constants, // keeping sizeof() as the second factor argument. @@ expression THING, E1, E2; type TYPE; constant C1, C2, C3; @@ ( kzalloc(sizeof(THING) * C2, ...) | kzalloc(sizeof(TYPE) * C2, ...) | kzalloc(C1 * C2 * C3, ...) | kzalloc(C1 * C2, ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * (E2) + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(TYPE) * E2 + E2, sizeof(TYPE) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * (E2) + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - sizeof(THING) * E2 + E2, sizeof(THING) , ...) | - kzalloc + kcalloc ( - (E1) * E2 + E1, E2 , ...) | - kzalloc + kcalloc ( - (E1) * (E2) + E1, E2 , ...) | - kzalloc + kcalloc ( - E1 * E2 + E1, E2 , ...) ) Signed-off-by: Kees Cook <keescook@chromium.org>
667 lines
15 KiB
C
667 lines
15 KiB
C
/*
|
|
* TI Divider Clock
|
|
*
|
|
* Copyright (C) 2013 Texas Instruments, Inc.
|
|
*
|
|
* Tero Kristo <t-kristo@ti.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed "as is" WITHOUT ANY WARRANTY of any
|
|
* kind, whether express or implied; without even the implied warranty
|
|
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/clk/ti.h>
|
|
#include "clock.h"
|
|
|
|
#undef pr_fmt
|
|
#define pr_fmt(fmt) "%s: " fmt, __func__
|
|
|
|
#define div_mask(d) ((1 << ((d)->width)) - 1)
|
|
|
|
static unsigned int _get_table_maxdiv(const struct clk_div_table *table)
|
|
{
|
|
unsigned int maxdiv = 0;
|
|
const struct clk_div_table *clkt;
|
|
|
|
for (clkt = table; clkt->div; clkt++)
|
|
if (clkt->div > maxdiv)
|
|
maxdiv = clkt->div;
|
|
return maxdiv;
|
|
}
|
|
|
|
static unsigned int _get_maxdiv(struct clk_omap_divider *divider)
|
|
{
|
|
if (divider->flags & CLK_DIVIDER_ONE_BASED)
|
|
return div_mask(divider);
|
|
if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
|
|
return 1 << div_mask(divider);
|
|
if (divider->table)
|
|
return _get_table_maxdiv(divider->table);
|
|
return div_mask(divider) + 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(struct clk_omap_divider *divider, unsigned int val)
|
|
{
|
|
if (divider->flags & CLK_DIVIDER_ONE_BASED)
|
|
return val;
|
|
if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
|
|
return 1 << val;
|
|
if (divider->table)
|
|
return _get_table_div(divider->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(struct clk_omap_divider *divider, u8 div)
|
|
{
|
|
if (divider->flags & CLK_DIVIDER_ONE_BASED)
|
|
return div;
|
|
if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
|
|
return __ffs(div);
|
|
if (divider->table)
|
|
return _get_table_val(divider->table, div);
|
|
return div - 1;
|
|
}
|
|
|
|
static unsigned long ti_clk_divider_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_omap_divider *divider = to_clk_omap_divider(hw);
|
|
unsigned int div, val;
|
|
|
|
val = ti_clk_ll_ops->clk_readl(÷r->reg) >> divider->shift;
|
|
val &= div_mask(divider);
|
|
|
|
div = _get_div(divider, val);
|
|
if (!div) {
|
|
WARN(!(divider->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(parent_rate, div);
|
|
}
|
|
|
|
/*
|
|
* The reverse of DIV_ROUND_UP: The maximum number which
|
|
* divided by m is r
|
|
*/
|
|
#define MULT_ROUND_UP(r, m) ((r) * (m) + (m) - 1)
|
|
|
|
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(struct clk_omap_divider *divider, unsigned int div)
|
|
{
|
|
if (divider->flags & CLK_DIVIDER_POWER_OF_TWO)
|
|
return is_power_of_2(div);
|
|
if (divider->table)
|
|
return _is_valid_table_div(divider->table, div);
|
|
return true;
|
|
}
|
|
|
|
static int _div_round_up(const struct clk_div_table *table,
|
|
unsigned long parent_rate, unsigned long rate)
|
|
{
|
|
const struct clk_div_table *clkt;
|
|
int up = INT_MAX;
|
|
int div = DIV_ROUND_UP_ULL((u64)parent_rate, rate);
|
|
|
|
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 _div_round(const struct clk_div_table *table,
|
|
unsigned long parent_rate, unsigned long rate)
|
|
{
|
|
if (!table)
|
|
return DIV_ROUND_UP(parent_rate, rate);
|
|
|
|
return _div_round_up(table, parent_rate, rate);
|
|
}
|
|
|
|
static int ti_clk_divider_bestdiv(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *best_parent_rate)
|
|
{
|
|
struct clk_omap_divider *divider = to_clk_omap_divider(hw);
|
|
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(divider);
|
|
|
|
if (!(clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT)) {
|
|
parent_rate = *best_parent_rate;
|
|
bestdiv = _div_round(divider->table, parent_rate, rate);
|
|
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 = 1; i <= maxdiv; i++) {
|
|
if (!_is_valid_div(divider, i))
|
|
continue;
|
|
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(clk_hw_get_parent(hw),
|
|
MULT_ROUND_UP(rate, i));
|
|
now = DIV_ROUND_UP(parent_rate, i);
|
|
if (now <= rate && now > best) {
|
|
bestdiv = i;
|
|
best = now;
|
|
*best_parent_rate = parent_rate;
|
|
}
|
|
}
|
|
|
|
if (!bestdiv) {
|
|
bestdiv = _get_maxdiv(divider);
|
|
*best_parent_rate =
|
|
clk_hw_round_rate(clk_hw_get_parent(hw), 1);
|
|
}
|
|
|
|
return bestdiv;
|
|
}
|
|
|
|
static long ti_clk_divider_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *prate)
|
|
{
|
|
int div;
|
|
div = ti_clk_divider_bestdiv(hw, rate, prate);
|
|
|
|
return DIV_ROUND_UP(*prate, div);
|
|
}
|
|
|
|
static int ti_clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct clk_omap_divider *divider;
|
|
unsigned int div, value;
|
|
u32 val;
|
|
|
|
if (!hw || !rate)
|
|
return -EINVAL;
|
|
|
|
divider = to_clk_omap_divider(hw);
|
|
|
|
div = DIV_ROUND_UP(parent_rate, rate);
|
|
value = _get_val(divider, div);
|
|
|
|
if (value > div_mask(divider))
|
|
value = div_mask(divider);
|
|
|
|
if (divider->flags & CLK_DIVIDER_HIWORD_MASK) {
|
|
val = div_mask(divider) << (divider->shift + 16);
|
|
} else {
|
|
val = ti_clk_ll_ops->clk_readl(÷r->reg);
|
|
val &= ~(div_mask(divider) << divider->shift);
|
|
}
|
|
val |= value << divider->shift;
|
|
ti_clk_ll_ops->clk_writel(val, ÷r->reg);
|
|
|
|
ti_clk_latch(÷r->reg, divider->latch);
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct clk_ops ti_clk_divider_ops = {
|
|
.recalc_rate = ti_clk_divider_recalc_rate,
|
|
.round_rate = ti_clk_divider_round_rate,
|
|
.set_rate = ti_clk_divider_set_rate,
|
|
};
|
|
|
|
static struct clk *_register_divider(struct device *dev, const char *name,
|
|
const char *parent_name,
|
|
unsigned long flags,
|
|
struct clk_omap_reg *reg,
|
|
u8 shift, u8 width, s8 latch,
|
|
u8 clk_divider_flags,
|
|
const struct clk_div_table *table)
|
|
{
|
|
struct clk_omap_divider *div;
|
|
struct clk *clk;
|
|
struct clk_init_data init;
|
|
|
|
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;
|
|
init.ops = &ti_clk_divider_ops;
|
|
init.flags = flags | CLK_IS_BASIC;
|
|
init.parent_names = (parent_name ? &parent_name : NULL);
|
|
init.num_parents = (parent_name ? 1 : 0);
|
|
|
|
/* struct clk_divider assignments */
|
|
memcpy(&div->reg, reg, sizeof(*reg));
|
|
div->shift = shift;
|
|
div->width = width;
|
|
div->latch = latch;
|
|
div->flags = clk_divider_flags;
|
|
div->hw.init = &init;
|
|
div->table = table;
|
|
|
|
/* register the clock */
|
|
clk = ti_clk_register(dev, &div->hw, name);
|
|
|
|
if (IS_ERR(clk))
|
|
kfree(div);
|
|
|
|
return clk;
|
|
}
|
|
|
|
int ti_clk_parse_divider_data(int *div_table, int num_dividers, int max_div,
|
|
u8 flags, u8 *width,
|
|
const struct clk_div_table **table)
|
|
{
|
|
int valid_div = 0;
|
|
u32 val;
|
|
int div;
|
|
int i;
|
|
struct clk_div_table *tmp;
|
|
|
|
if (!div_table) {
|
|
if (flags & CLKF_INDEX_STARTS_AT_ONE)
|
|
val = 1;
|
|
else
|
|
val = 0;
|
|
|
|
div = 1;
|
|
|
|
while (div < max_div) {
|
|
if (flags & CLKF_INDEX_POWER_OF_TWO)
|
|
div <<= 1;
|
|
else
|
|
div++;
|
|
val++;
|
|
}
|
|
|
|
*width = fls(val);
|
|
*table = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
i = 0;
|
|
|
|
while (!num_dividers || i < num_dividers) {
|
|
if (div_table[i] == -1)
|
|
break;
|
|
if (div_table[i])
|
|
valid_div++;
|
|
i++;
|
|
}
|
|
|
|
num_dividers = i;
|
|
|
|
tmp = kcalloc(valid_div + 1, sizeof(*tmp), GFP_KERNEL);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
valid_div = 0;
|
|
*width = 0;
|
|
|
|
for (i = 0; i < num_dividers; i++)
|
|
if (div_table[i] > 0) {
|
|
tmp[valid_div].div = div_table[i];
|
|
tmp[valid_div].val = i;
|
|
valid_div++;
|
|
*width = i;
|
|
}
|
|
|
|
*width = fls(*width);
|
|
*table = tmp;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_div_table *
|
|
_get_div_table_from_setup(struct ti_clk_divider *setup, u8 *width)
|
|
{
|
|
const struct clk_div_table *table = NULL;
|
|
|
|
ti_clk_parse_divider_data(setup->dividers, setup->num_dividers,
|
|
setup->max_div, setup->flags, width,
|
|
&table);
|
|
|
|
return table;
|
|
}
|
|
|
|
struct clk_hw *ti_clk_build_component_div(struct ti_clk_divider *setup)
|
|
{
|
|
struct clk_omap_divider *div;
|
|
struct clk_omap_reg *reg;
|
|
|
|
if (!setup)
|
|
return NULL;
|
|
|
|
div = kzalloc(sizeof(*div), GFP_KERNEL);
|
|
if (!div)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
reg = (struct clk_omap_reg *)&div->reg;
|
|
reg->index = setup->module;
|
|
reg->offset = setup->reg;
|
|
|
|
if (setup->flags & CLKF_INDEX_STARTS_AT_ONE)
|
|
div->flags |= CLK_DIVIDER_ONE_BASED;
|
|
|
|
if (setup->flags & CLKF_INDEX_POWER_OF_TWO)
|
|
div->flags |= CLK_DIVIDER_POWER_OF_TWO;
|
|
|
|
div->table = _get_div_table_from_setup(setup, &div->width);
|
|
|
|
div->shift = setup->bit_shift;
|
|
div->latch = -EINVAL;
|
|
|
|
return &div->hw;
|
|
}
|
|
|
|
struct clk *ti_clk_register_divider(struct ti_clk *setup)
|
|
{
|
|
struct ti_clk_divider *div = setup->data;
|
|
struct clk_omap_reg reg = {
|
|
.index = div->module,
|
|
.offset = div->reg,
|
|
};
|
|
u8 width;
|
|
u32 flags = 0;
|
|
u8 div_flags = 0;
|
|
const struct clk_div_table *table;
|
|
struct clk *clk;
|
|
|
|
if (div->flags & CLKF_INDEX_STARTS_AT_ONE)
|
|
div_flags |= CLK_DIVIDER_ONE_BASED;
|
|
|
|
if (div->flags & CLKF_INDEX_POWER_OF_TWO)
|
|
div_flags |= CLK_DIVIDER_POWER_OF_TWO;
|
|
|
|
if (div->flags & CLKF_SET_RATE_PARENT)
|
|
flags |= CLK_SET_RATE_PARENT;
|
|
|
|
table = _get_div_table_from_setup(div, &width);
|
|
if (IS_ERR(table))
|
|
return (struct clk *)table;
|
|
|
|
clk = _register_divider(NULL, setup->name, div->parent,
|
|
flags, ®, div->bit_shift,
|
|
width, -EINVAL, div_flags, table);
|
|
|
|
if (IS_ERR(clk))
|
|
kfree(table);
|
|
|
|
return clk;
|
|
}
|
|
|
|
static struct clk_div_table *
|
|
__init ti_clk_get_div_table(struct device_node *node)
|
|
{
|
|
struct clk_div_table *table;
|
|
const __be32 *divspec;
|
|
u32 val;
|
|
u32 num_div;
|
|
u32 valid_div;
|
|
int i;
|
|
|
|
divspec = of_get_property(node, "ti,dividers", &num_div);
|
|
|
|
if (!divspec)
|
|
return NULL;
|
|
|
|
num_div /= 4;
|
|
|
|
valid_div = 0;
|
|
|
|
/* Determine required size for divider table */
|
|
for (i = 0; i < num_div; i++) {
|
|
of_property_read_u32_index(node, "ti,dividers", i, &val);
|
|
if (val)
|
|
valid_div++;
|
|
}
|
|
|
|
if (!valid_div) {
|
|
pr_err("no valid dividers for %s table\n", node->name);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
|
|
table = kcalloc(valid_div + 1, sizeof(*table), GFP_KERNEL);
|
|
|
|
if (!table)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
valid_div = 0;
|
|
|
|
for (i = 0; i < num_div; i++) {
|
|
of_property_read_u32_index(node, "ti,dividers", i, &val);
|
|
if (val) {
|
|
table[valid_div].div = val;
|
|
table[valid_div].val = i;
|
|
valid_div++;
|
|
}
|
|
}
|
|
|
|
return table;
|
|
}
|
|
|
|
static int _get_divider_width(struct device_node *node,
|
|
const struct clk_div_table *table,
|
|
u8 flags)
|
|
{
|
|
u32 min_div;
|
|
u32 max_div;
|
|
u32 val = 0;
|
|
u32 div;
|
|
|
|
if (!table) {
|
|
/* Clk divider table not provided, determine min/max divs */
|
|
if (of_property_read_u32(node, "ti,min-div", &min_div))
|
|
min_div = 1;
|
|
|
|
if (of_property_read_u32(node, "ti,max-div", &max_div)) {
|
|
pr_err("no max-div for %s!\n", node->name);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Determine bit width for the field */
|
|
if (flags & CLK_DIVIDER_ONE_BASED)
|
|
val = 1;
|
|
|
|
div = min_div;
|
|
|
|
while (div < max_div) {
|
|
if (flags & CLK_DIVIDER_POWER_OF_TWO)
|
|
div <<= 1;
|
|
else
|
|
div++;
|
|
val++;
|
|
}
|
|
} else {
|
|
div = 0;
|
|
|
|
while (table[div].div) {
|
|
val = table[div].val;
|
|
div++;
|
|
}
|
|
}
|
|
|
|
return fls(val);
|
|
}
|
|
|
|
static int __init ti_clk_divider_populate(struct device_node *node,
|
|
struct clk_omap_reg *reg, const struct clk_div_table **table,
|
|
u32 *flags, u8 *div_flags, u8 *width, u8 *shift, s8 *latch)
|
|
{
|
|
u32 val;
|
|
int ret;
|
|
|
|
ret = ti_clk_get_reg_addr(node, 0, reg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (!of_property_read_u32(node, "ti,bit-shift", &val))
|
|
*shift = val;
|
|
else
|
|
*shift = 0;
|
|
|
|
if (latch) {
|
|
if (!of_property_read_u32(node, "ti,latch-bit", &val))
|
|
*latch = val;
|
|
else
|
|
*latch = -EINVAL;
|
|
}
|
|
|
|
*flags = 0;
|
|
*div_flags = 0;
|
|
|
|
if (of_property_read_bool(node, "ti,index-starts-at-one"))
|
|
*div_flags |= CLK_DIVIDER_ONE_BASED;
|
|
|
|
if (of_property_read_bool(node, "ti,index-power-of-two"))
|
|
*div_flags |= CLK_DIVIDER_POWER_OF_TWO;
|
|
|
|
if (of_property_read_bool(node, "ti,set-rate-parent"))
|
|
*flags |= CLK_SET_RATE_PARENT;
|
|
|
|
*table = ti_clk_get_div_table(node);
|
|
|
|
if (IS_ERR(*table))
|
|
return PTR_ERR(*table);
|
|
|
|
*width = _get_divider_width(node, *table, *div_flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* of_ti_divider_clk_setup - Setup function for simple div rate clock
|
|
* @node: device node for this clock
|
|
*
|
|
* Sets up a basic divider clock.
|
|
*/
|
|
static void __init of_ti_divider_clk_setup(struct device_node *node)
|
|
{
|
|
struct clk *clk;
|
|
const char *parent_name;
|
|
struct clk_omap_reg reg;
|
|
u8 clk_divider_flags = 0;
|
|
u8 width = 0;
|
|
u8 shift = 0;
|
|
s8 latch = -EINVAL;
|
|
const struct clk_div_table *table = NULL;
|
|
u32 flags = 0;
|
|
|
|
parent_name = of_clk_get_parent_name(node, 0);
|
|
|
|
if (ti_clk_divider_populate(node, ®, &table, &flags,
|
|
&clk_divider_flags, &width, &shift, &latch))
|
|
goto cleanup;
|
|
|
|
clk = _register_divider(NULL, node->name, parent_name, flags, ®,
|
|
shift, width, latch, clk_divider_flags, table);
|
|
|
|
if (!IS_ERR(clk)) {
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
of_ti_clk_autoidle_setup(node);
|
|
return;
|
|
}
|
|
|
|
cleanup:
|
|
kfree(table);
|
|
}
|
|
CLK_OF_DECLARE(divider_clk, "ti,divider-clock", of_ti_divider_clk_setup);
|
|
|
|
static void __init of_ti_composite_divider_clk_setup(struct device_node *node)
|
|
{
|
|
struct clk_omap_divider *div;
|
|
u32 val;
|
|
|
|
div = kzalloc(sizeof(*div), GFP_KERNEL);
|
|
if (!div)
|
|
return;
|
|
|
|
if (ti_clk_divider_populate(node, &div->reg, &div->table, &val,
|
|
&div->flags, &div->width, &div->shift,
|
|
NULL) < 0)
|
|
goto cleanup;
|
|
|
|
if (!ti_clk_add_component(node, &div->hw, CLK_COMPONENT_TYPE_DIVIDER))
|
|
return;
|
|
|
|
cleanup:
|
|
kfree(div->table);
|
|
kfree(div);
|
|
}
|
|
CLK_OF_DECLARE(ti_composite_divider_clk, "ti,composite-divider-clock",
|
|
of_ti_composite_divider_clk_setup);
|