Commit 2ab836db authored by Maxime Ripard's avatar Maxime Ripard Committed by Michael Turquette

clk: sunxi-ng: Add M-P factor clock support

Introduce support for the clocks that combine a linear divider and a
power-of-two based one.
Signed-off-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarMichael Turquette <mturquette@baylibre.com>
Link: lkml.kernel.org/r/20160629190535.11855-9-maxime.ripard@free-electrons.com
parent e9b93213
......@@ -22,4 +22,11 @@ config SUNXI_CCU_MUX
config SUNXI_CCU_PHASE
bool
# Multi-factor clocks
config SUNXI_CCU_MP
bool
select SUNXI_CCU_GATE
select SUNXI_CCU_MUX
endif
......@@ -8,3 +8,6 @@ obj-$(CONFIG_SUNXI_CCU_FRAC) += ccu_frac.o
obj-$(CONFIG_SUNXI_CCU_GATE) += ccu_gate.o
obj-$(CONFIG_SUNXI_CCU_MUX) += ccu_mux.o
obj-$(CONFIG_SUNXI_CCU_PHASE) += ccu_phase.o
# Multi-factor clocks
obj-$(CONFIG_SUNXI_CCU_MP) += ccu_mp.o
/*
* 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 "ccu_gate.h"
#include "ccu_mp.h"
static void ccu_mp_find_best(unsigned long parent, unsigned long rate,
unsigned int max_m, unsigned int max_p,
unsigned int *m, unsigned int *p)
{
unsigned long best_rate = 0;
unsigned int best_m = 0, best_p = 0;
unsigned int _m, _p;
for (_p = 0; _p <= max_p; _p++) {
for (_m = 1; _m <= max_m; _m++) {
unsigned long tmp_rate = (parent >> _p) / _m;
if (tmp_rate > rate)
continue;
if ((rate - tmp_rate) < (rate - best_rate)) {
best_rate = tmp_rate;
best_m = _m;
best_p = _p;
}
}
}
*m = best_m;
*p = best_p;
}
static unsigned long ccu_mp_round_rate(struct ccu_mux_internal *mux,
unsigned long parent_rate,
unsigned long rate,
void *data)
{
struct ccu_mp *cmp = data;
unsigned int m, p;
ccu_mp_find_best(parent_rate, rate,
1 << cmp->m.width, (1 << cmp->p.width) - 1,
&m, &p);
return (parent_rate >> p) / m;
}
static void ccu_mp_disable(struct clk_hw *hw)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_gate_helper_disable(&cmp->common, cmp->enable);
}
static int ccu_mp_enable(struct clk_hw *hw)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_gate_helper_enable(&cmp->common, cmp->enable);
}
static int ccu_mp_is_enabled(struct clk_hw *hw)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_gate_helper_is_enabled(&cmp->common, cmp->enable);
}
static unsigned long ccu_mp_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
unsigned int m, p;
u32 reg;
reg = readl(cmp->common.base + cmp->common.reg);
m = reg >> cmp->m.shift;
m &= (1 << cmp->m.width) - 1;
p = reg >> cmp->p.shift;
p &= (1 << cmp->p.width) - 1;
return (parent_rate >> p) / (m + 1);
}
static int ccu_mp_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_mux_helper_determine_rate(&cmp->common, &cmp->mux,
req, ccu_mp_round_rate, cmp);
}
static int ccu_mp_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
unsigned long flags;
unsigned int m, p;
u32 reg;
ccu_mp_find_best(parent_rate, rate,
1 << cmp->m.width, (1 << cmp->p.width) - 1,
&m, &p);
spin_lock_irqsave(cmp->common.lock, flags);
reg = readl(cmp->common.base + cmp->common.reg);
reg &= ~GENMASK(cmp->m.width + cmp->m.shift - 1, cmp->m.shift);
reg &= ~GENMASK(cmp->p.width + cmp->p.shift - 1, cmp->p.shift);
writel(reg | (p << cmp->p.shift) | ((m - 1) << cmp->m.shift),
cmp->common.base + cmp->common.reg);
spin_unlock_irqrestore(cmp->common.lock, flags);
return 0;
}
static u8 ccu_mp_get_parent(struct clk_hw *hw)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_mux_helper_get_parent(&cmp->common, &cmp->mux);
}
static int ccu_mp_set_parent(struct clk_hw *hw, u8 index)
{
struct ccu_mp *cmp = hw_to_ccu_mp(hw);
return ccu_mux_helper_set_parent(&cmp->common, &cmp->mux, index);
}
const struct clk_ops ccu_mp_ops = {
.disable = ccu_mp_disable,
.enable = ccu_mp_enable,
.is_enabled = ccu_mp_is_enabled,
.get_parent = ccu_mp_get_parent,
.set_parent = ccu_mp_set_parent,
.determine_rate = ccu_mp_determine_rate,
.recalc_rate = ccu_mp_recalc_rate,
.set_rate = ccu_mp_set_rate,
};
/*
* Copyright (c) 2016 Maxime Ripard. All rights reserved.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _CCU_MP_H_
#define _CCU_MP_H_
#include <linux/clk-provider.h>
#include "ccu_common.h"
#include "ccu_div.h"
#include "ccu_mult.h"
#include "ccu_mux.h"
/*
* struct ccu_mp - Definition of an M-P clock
*
* Clocks based on the formula parent >> P / M
*/
struct ccu_mp {
u32 enable;
struct _ccu_div m;
struct _ccu_div p;
struct ccu_mux_internal mux;
struct ccu_common common;
};
#define SUNXI_CCU_MP_WITH_MUX_GATE(_struct, _name, _parents, _reg, \
_mshift, _mwidth, \
_pshift, _pwidth, \
_muxshift, _muxwidth, \
_gate, _flags) \
struct ccu_mp _struct = { \
.enable = _gate, \
.m = _SUNXI_CCU_DIV(_mshift, _mwidth), \
.p = _SUNXI_CCU_DIV(_pshift, _pwidth), \
.mux = SUNXI_CLK_MUX(_muxshift, _muxwidth), \
.common = { \
.reg = _reg, \
.hw.init = CLK_HW_INIT_PARENTS(_name, \
_parents, \
&ccu_mp_ops, \
_flags), \
} \
}
#define SUNXI_CCU_MP_WITH_MUX(_struct, _name, _parents, _reg, \
_mshift, _mwidth, \
_pshift, _pwidth, \
_muxshift, _muxwidth, \
_flags) \
SUNXI_CCU_MP_WITH_MUX_GATE(_struct, _name, _parents, _reg, \
_mshift, _mwidth, \
_pshift, _pwidth, \
_muxshift, _muxwidth, \
0, _flags)
static inline struct ccu_mp *hw_to_ccu_mp(struct clk_hw *hw)
{
struct ccu_common *common = hw_to_ccu_common(hw);
return container_of(common, struct ccu_mp, common);
}
extern const struct clk_ops ccu_mp_ops;
#endif /* _CCU_MP_H_ */
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