2874c5fd28
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>
110 lines
2.6 KiB
C
110 lines
2.6 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 <linux/spinlock.h>
|
|
|
|
#include "ccu_frac.h"
|
|
|
|
bool ccu_frac_helper_is_enabled(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf)
|
|
{
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return false;
|
|
|
|
return !(readl(common->base + common->reg) & cf->enable);
|
|
}
|
|
|
|
void ccu_frac_helper_enable(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf)
|
|
{
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return;
|
|
|
|
spin_lock_irqsave(common->lock, flags);
|
|
reg = readl(common->base + common->reg);
|
|
writel(reg & ~cf->enable, common->base + common->reg);
|
|
spin_unlock_irqrestore(common->lock, flags);
|
|
}
|
|
|
|
void ccu_frac_helper_disable(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf)
|
|
{
|
|
unsigned long flags;
|
|
u32 reg;
|
|
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return;
|
|
|
|
spin_lock_irqsave(common->lock, flags);
|
|
reg = readl(common->base + common->reg);
|
|
writel(reg | cf->enable, common->base + common->reg);
|
|
spin_unlock_irqrestore(common->lock, flags);
|
|
}
|
|
|
|
bool ccu_frac_helper_has_rate(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf,
|
|
unsigned long rate)
|
|
{
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return false;
|
|
|
|
return (cf->rates[0] == rate) || (cf->rates[1] == rate);
|
|
}
|
|
|
|
unsigned long ccu_frac_helper_read_rate(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf)
|
|
{
|
|
u32 reg;
|
|
|
|
pr_debug("%s: Read fractional\n", clk_hw_get_name(&common->hw));
|
|
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return 0;
|
|
|
|
pr_debug("%s: clock is fractional (rates %lu and %lu)\n",
|
|
clk_hw_get_name(&common->hw), cf->rates[0], cf->rates[1]);
|
|
|
|
reg = readl(common->base + common->reg);
|
|
|
|
pr_debug("%s: clock reg is 0x%x (select is 0x%x)\n",
|
|
clk_hw_get_name(&common->hw), reg, cf->select);
|
|
|
|
return (reg & cf->select) ? cf->rates[1] : cf->rates[0];
|
|
}
|
|
|
|
int ccu_frac_helper_set_rate(struct ccu_common *common,
|
|
struct ccu_frac_internal *cf,
|
|
unsigned long rate, u32 lock)
|
|
{
|
|
unsigned long flags;
|
|
u32 reg, sel;
|
|
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
|
return -EINVAL;
|
|
|
|
if (cf->rates[0] == rate)
|
|
sel = 0;
|
|
else if (cf->rates[1] == rate)
|
|
sel = cf->select;
|
|
else
|
|
return -EINVAL;
|
|
|
|
spin_lock_irqsave(common->lock, flags);
|
|
reg = readl(common->base + common->reg);
|
|
reg &= ~cf->select;
|
|
writel(reg | sel, common->base + common->reg);
|
|
spin_unlock_irqrestore(common->lock, flags);
|
|
|
|
ccu_helper_wait_for_lock(common, lock);
|
|
|
|
return 0;
|
|
}
|