551b62b1e4
For the individual CCU drivers to be built as modules, the ops structs, helper functions, and callback registration functions must be exported. These symbols are intended for use only by the adjacent CCU drivers, so export them into the SUNXI_CCU namespace. of_sunxi_ccu_probe is not exported because it is only used by built-in OF clock providers. Signed-off-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Maxime Ripard <maxime@cerno.tech> Link: https://lore.kernel.org/r/20211119033338.25486-2-samuel@sholland.org
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) 2016 Maxime Ripard
|
|
* Maxime Ripard <maxime.ripard@free-electrons.com>
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/io.h>
|
|
|
|
#include "ccu_gate.h"
|
|
|
|
void ccu_gate_helper_disable(struct ccu_common *common, u32 gate)
|
|
{
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
if (!gate)
|
|
return;
|
|
|
|
spin_lock_irqsave(common->lock, flags);
|
|
|
|
reg = readl(common->base + common->reg);
|
|
writel(reg & ~gate, common->base + common->reg);
|
|
|
|
spin_unlock_irqrestore(common->lock, flags);
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_disable, SUNXI_CCU);
|
|
|
|
static void ccu_gate_disable(struct clk_hw *hw)
|
|
{
|
|
struct ccu_gate *cg = hw_to_ccu_gate(hw);
|
|
|
|
return ccu_gate_helper_disable(&cg->common, cg->enable);
|
|
}
|
|
|
|
int ccu_gate_helper_enable(struct ccu_common *common, u32 gate)
|
|
{
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
if (!gate)
|
|
return 0;
|
|
|
|
spin_lock_irqsave(common->lock, flags);
|
|
|
|
reg = readl(common->base + common->reg);
|
|
writel(reg | gate, common->base + common->reg);
|
|
|
|
spin_unlock_irqrestore(common->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_enable, SUNXI_CCU);
|
|
|
|
static int ccu_gate_enable(struct clk_hw *hw)
|
|
{
|
|
struct ccu_gate *cg = hw_to_ccu_gate(hw);
|
|
|
|
return ccu_gate_helper_enable(&cg->common, cg->enable);
|
|
}
|
|
|
|
int ccu_gate_helper_is_enabled(struct ccu_common *common, u32 gate)
|
|
{
|
|
if (!gate)
|
|
return 1;
|
|
|
|
return readl(common->base + common->reg) & gate;
|
|
}
|
|
EXPORT_SYMBOL_NS_GPL(ccu_gate_helper_is_enabled, SUNXI_CCU);
|
|
|
|
static int ccu_gate_is_enabled(struct clk_hw *hw)
|
|
{
|
|
struct ccu_gate *cg = hw_to_ccu_gate(hw);
|
|
|
|
return ccu_gate_helper_is_enabled(&cg->common, cg->enable);
|
|
}
|
|
|
|
static unsigned long ccu_gate_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct ccu_gate *cg = hw_to_ccu_gate(hw);
|
|
unsigned long rate = parent_rate;
|
|
|
|
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
|
|
rate /= cg->common.prediv;
|
|
|
|
return rate;
|
|
}
|
|
|
|
static long ccu_gate_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *prate)
|
|
{
|
|
struct ccu_gate *cg = hw_to_ccu_gate(hw);
|
|
int div = 1;
|
|
|
|
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
|
|
div = cg->common.prediv;
|
|
|
|
if (clk_hw_get_flags(hw) & CLK_SET_RATE_PARENT) {
|
|
unsigned long best_parent = rate;
|
|
|
|
if (cg->common.features & CCU_FEATURE_ALL_PREDIV)
|
|
best_parent *= div;
|
|
*prate = clk_hw_round_rate(clk_hw_get_parent(hw), best_parent);
|
|
}
|
|
|
|
return *prate / div;
|
|
}
|
|
|
|
static int ccu_gate_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
/*
|
|
* We must report success but we can do so unconditionally because
|
|
* clk_factor_round_rate returns values that ensure this call is a
|
|
* nop.
|
|
*/
|
|
|
|
return 0;
|
|
}
|
|
|
|
const struct clk_ops ccu_gate_ops = {
|
|
.disable = ccu_gate_disable,
|
|
.enable = ccu_gate_enable,
|
|
.is_enabled = ccu_gate_is_enabled,
|
|
.round_rate = ccu_gate_round_rate,
|
|
.set_rate = ccu_gate_set_rate,
|
|
.recalc_rate = ccu_gate_recalc_rate,
|
|
};
|
|
EXPORT_SYMBOL_NS_GPL(ccu_gate_ops, SUNXI_CCU);
|