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linux-next/drivers/clk/qcom/clk-branch.c
Gustavo A. R. Silva 681cd4a890 clk: qcom: clk-branch: Use true and false for boolean values
Return statements in functions returning bool should use true or false
instead of an integer value.

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
2018-08-30 15:18:59 -07:00

155 lines
3.5 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*/
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/clk-provider.h>
#include <linux/regmap.h>
#include "clk-branch.h"
static bool clk_branch_in_hwcg_mode(const struct clk_branch *br)
{
u32 val;
if (!br->hwcg_reg)
return false;
regmap_read(br->clkr.regmap, br->hwcg_reg, &val);
return !!(val & BIT(br->hwcg_bit));
}
static bool clk_branch_check_halt(const struct clk_branch *br, bool enabling)
{
bool invert = (br->halt_check == BRANCH_HALT_ENABLE);
u32 val;
regmap_read(br->clkr.regmap, br->halt_reg, &val);
val &= BIT(br->halt_bit);
if (invert)
val = !val;
return !!val == !enabling;
}
#define BRANCH_CLK_OFF BIT(31)
#define BRANCH_NOC_FSM_STATUS_SHIFT 28
#define BRANCH_NOC_FSM_STATUS_MASK 0x7
#define BRANCH_NOC_FSM_STATUS_ON (0x2 << BRANCH_NOC_FSM_STATUS_SHIFT)
static bool clk_branch2_check_halt(const struct clk_branch *br, bool enabling)
{
u32 val;
u32 mask;
mask = BRANCH_NOC_FSM_STATUS_MASK << BRANCH_NOC_FSM_STATUS_SHIFT;
mask |= BRANCH_CLK_OFF;
regmap_read(br->clkr.regmap, br->halt_reg, &val);
if (enabling) {
val &= mask;
return (val & BRANCH_CLK_OFF) == 0 ||
val == BRANCH_NOC_FSM_STATUS_ON;
} else {
return val & BRANCH_CLK_OFF;
}
}
static int clk_branch_wait(const struct clk_branch *br, bool enabling,
bool (check_halt)(const struct clk_branch *, bool))
{
bool voted = br->halt_check & BRANCH_VOTED;
const char *name = clk_hw_get_name(&br->clkr.hw);
/*
* Skip checking halt bit if we're explicitly ignoring the bit or the
* clock is in hardware gated mode
*/
if (br->halt_check == BRANCH_HALT_SKIP || clk_branch_in_hwcg_mode(br))
return 0;
if (br->halt_check == BRANCH_HALT_DELAY || (!enabling && voted)) {
udelay(10);
} else if (br->halt_check == BRANCH_HALT_ENABLE ||
br->halt_check == BRANCH_HALT ||
(enabling && voted)) {
int count = 200;
while (count-- > 0) {
if (check_halt(br, enabling))
return 0;
udelay(1);
}
WARN(1, "%s status stuck at 'o%s'", name,
enabling ? "ff" : "n");
return -EBUSY;
}
return 0;
}
static int clk_branch_toggle(struct clk_hw *hw, bool en,
bool (check_halt)(const struct clk_branch *, bool))
{
struct clk_branch *br = to_clk_branch(hw);
int ret;
if (en) {
ret = clk_enable_regmap(hw);
if (ret)
return ret;
} else {
clk_disable_regmap(hw);
}
return clk_branch_wait(br, en, check_halt);
}
static int clk_branch_enable(struct clk_hw *hw)
{
return clk_branch_toggle(hw, true, clk_branch_check_halt);
}
static void clk_branch_disable(struct clk_hw *hw)
{
clk_branch_toggle(hw, false, clk_branch_check_halt);
}
const struct clk_ops clk_branch_ops = {
.enable = clk_branch_enable,
.disable = clk_branch_disable,
.is_enabled = clk_is_enabled_regmap,
};
EXPORT_SYMBOL_GPL(clk_branch_ops);
static int clk_branch2_enable(struct clk_hw *hw)
{
return clk_branch_toggle(hw, true, clk_branch2_check_halt);
}
static void clk_branch2_disable(struct clk_hw *hw)
{
clk_branch_toggle(hw, false, clk_branch2_check_halt);
}
const struct clk_ops clk_branch2_ops = {
.enable = clk_branch2_enable,
.disable = clk_branch2_disable,
.is_enabled = clk_is_enabled_regmap,
};
EXPORT_SYMBOL_GPL(clk_branch2_ops);
const struct clk_ops clk_branch_simple_ops = {
.enable = clk_enable_regmap,
.disable = clk_disable_regmap,
.is_enabled = clk_is_enabled_regmap,
};
EXPORT_SYMBOL_GPL(clk_branch_simple_ops);