mirror of https://gitee.com/openkylin/linux.git
111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
|
/*
|
||
|
|
* Copyright (C) 2016 Maxime Ripard
|
||
|
|
* Maxime Ripard <maxime.ripard@free-electrons.com>
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/clk-provider.h>
|
||
|
|
#include <linux/spinlock.h>
|
||
|
|
|
||
|
|
#include "ccu_frac.h"
|
||
|
|
|
||
|
|
bool ccu_frac_helper_is_enabled(struct ccu_common *common,
|
||
|
|
struct _ccu_frac *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 *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 *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 *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 *cf)
|
||
|
|
{
|
||
|
|
u32 reg;
|
||
|
|
|
||
|
|
printk("%s: Read fractional\n", clk_hw_get_name(&common->hw));
|
||
|
|
|
||
|
|
if (!(common->features & CCU_FEATURE_FRACTIONAL))
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
printk("%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);
|
||
|
|
|
||
|
|
printk("%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 *cf,
|
||
|
|
unsigned long rate)
|
||
|
|
{
|
||
|
|
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);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|