freebsd-dev/sys/arm/allwinner/clkng/aw_clk_nm.c
Emmanuel Vadot beba2ebaef arm: allwinner: Remove frac mode from NM clk
We have a correct clock type aw_clk_frac now for this.
2019-05-23 17:36:55 +00:00

353 lines
8.3 KiB
C

/*-
* Copyright (c) 2017 Emmanuel Vadot <manu@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <dev/extres/clk/clk.h>
#include <arm/allwinner/clkng/aw_clk.h>
#include <arm/allwinner/clkng/aw_clk_nm.h>
#include "clkdev_if.h"
/*
* clknode for clocks matching the formula :
*
* clk = clkin / n / m
*
*/
struct aw_clk_nm_sc {
uint32_t offset;
struct aw_clk_factor m;
struct aw_clk_factor n;
struct aw_clk_factor prediv;
uint32_t mux_shift;
uint32_t mux_mask;
uint32_t gate_shift;
uint32_t lock_shift;
uint32_t lock_retries;
uint32_t flags;
};
#define WRITE4(_clk, off, val) \
CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
#define READ4(_clk, off, val) \
CLKDEV_READ_4(clknode_get_device(_clk), off, val)
#define DEVICE_LOCK(_clk) \
CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
#define DEVICE_UNLOCK(_clk) \
CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
static int
aw_clk_nm_init(struct clknode *clk, device_t dev)
{
struct aw_clk_nm_sc *sc;
uint32_t val, idx;
sc = clknode_get_softc(clk);
idx = 0;
if ((sc->flags & AW_CLK_HAS_MUX) != 0) {
DEVICE_LOCK(clk);
READ4(clk, sc->offset, &val);
DEVICE_UNLOCK(clk);
idx = (val & sc->mux_mask) >> sc->mux_shift;
}
clknode_init_parent_idx(clk, idx);
return (0);
}
static int
aw_clk_nm_set_gate(struct clknode *clk, bool enable)
{
struct aw_clk_nm_sc *sc;
uint32_t val;
sc = clknode_get_softc(clk);
if ((sc->flags & AW_CLK_HAS_GATE) == 0)
return (0);
DEVICE_LOCK(clk);
READ4(clk, sc->offset, &val);
if (enable)
val |= (1 << sc->gate_shift);
else
val &= ~(1 << sc->gate_shift);
WRITE4(clk, sc->offset, val);
DEVICE_UNLOCK(clk);
return (0);
}
static int
aw_clk_nm_set_mux(struct clknode *clk, int index)
{
struct aw_clk_nm_sc *sc;
uint32_t val;
sc = clknode_get_softc(clk);
if ((sc->flags & AW_CLK_HAS_MUX) == 0)
return (0);
DEVICE_LOCK(clk);
READ4(clk, sc->offset, &val);
val &= ~sc->mux_mask;
val |= index << sc->mux_shift;
WRITE4(clk, sc->offset, val);
DEVICE_UNLOCK(clk);
return (0);
}
static uint64_t
aw_clk_nm_find_best(struct aw_clk_nm_sc *sc, uint64_t fparent, uint64_t *fout,
uint32_t *factor_n, uint32_t *factor_m)
{
uint64_t cur, best;
uint32_t m, n, max_m, max_n, min_m, min_n;
*factor_n = *factor_m = 0;
max_m = aw_clk_factor_get_max(&sc->m);
max_n = aw_clk_factor_get_max(&sc->n);
min_m = aw_clk_factor_get_min(&sc->m);
min_n = aw_clk_factor_get_min(&sc->n);
for (m = min_m; m <= max_m; ) {
for (n = min_m; n <= max_n; ) {
cur = fparent / n / m;
if (abs(*fout - cur) < abs(*fout - best)) {
best = cur;
*factor_n = n;
*factor_m = m;
}
if ((sc->n.flags & AW_CLK_FACTOR_POWER_OF_TWO) != 0)
n <<= 1;
else
n++;
}
if ((sc->m.flags & AW_CLK_FACTOR_POWER_OF_TWO) != 0)
m <<= 1;
else
m++;
}
return (best);
}
static int
aw_clk_nm_set_freq(struct clknode *clk, uint64_t fparent, uint64_t *fout,
int flags, int *stop)
{
struct aw_clk_nm_sc *sc;
struct clknode *p_clk;
const char **p_names;
uint64_t cur, best;
uint32_t val, m, n, best_m, best_n;
int p_idx, best_parent, retry;
sc = clknode_get_softc(clk);
best = cur = 0;
best_parent = 0;
if ((sc->flags & AW_CLK_REPARENT) != 0) {
p_names = clknode_get_parent_names(clk);
for (p_idx = 0; p_idx != clknode_get_parents_num(clk); p_idx++) {
p_clk = clknode_find_by_name(p_names[p_idx]);
clknode_get_freq(p_clk, &fparent);
cur = aw_clk_nm_find_best(sc, fparent, fout, &n, &m);
if ((*fout - cur) < (*fout - best)) {
best = cur;
best_parent = p_idx;
best_n = n;
best_m = m;
}
}
p_idx = clknode_get_parent_idx(clk);
p_clk = clknode_get_parent(clk);
clknode_get_freq(p_clk, &fparent);
} else {
best = aw_clk_nm_find_best(sc, fparent, fout,
&best_n, &best_m);
}
if ((flags & CLK_SET_DRYRUN) != 0) {
*fout = best;
*stop = 1;
return (0);
}
if ((best < *fout) &&
((flags & CLK_SET_ROUND_DOWN) == 0)) {
*stop = 1;
return (ERANGE);
}
if ((best > *fout) &&
((flags & CLK_SET_ROUND_UP) == 0)) {
*stop = 1;
return (ERANGE);
}
if ((sc->flags & AW_CLK_REPARENT) != 0 && p_idx != best_parent)
clknode_set_parent_by_idx(clk, best_parent);
DEVICE_LOCK(clk);
READ4(clk, sc->offset, &val);
n = aw_clk_factor_get_value(&sc->n, best_n);
m = aw_clk_factor_get_value(&sc->m, best_m);
val &= ~sc->n.mask;
val &= ~sc->m.mask;
val |= n << sc->n.shift;
val |= m << sc->m.shift;
WRITE4(clk, sc->offset, val);
DEVICE_UNLOCK(clk);
if ((sc->flags & AW_CLK_HAS_LOCK) != 0) {
for (retry = 0; retry < sc->lock_retries; retry++) {
READ4(clk, sc->offset, &val);
if ((val & (1 << sc->lock_shift)) != 0)
break;
DELAY(1000);
}
}
*fout = best;
*stop = 1;
return (0);
}
static int
aw_clk_nm_recalc(struct clknode *clk, uint64_t *freq)
{
struct aw_clk_nm_sc *sc;
uint32_t val, m, n, prediv;
sc = clknode_get_softc(clk);
DEVICE_LOCK(clk);
READ4(clk, sc->offset, &val);
DEVICE_UNLOCK(clk);
m = aw_clk_get_factor(val, &sc->m);
n = aw_clk_get_factor(val, &sc->n);
if (sc->flags & AW_CLK_HAS_PREDIV)
prediv = aw_clk_get_factor(val, &sc->prediv);
else
prediv = 1;
*freq = *freq / prediv / n / m;
return (0);
}
static clknode_method_t aw_nm_clknode_methods[] = {
/* Device interface */
CLKNODEMETHOD(clknode_init, aw_clk_nm_init),
CLKNODEMETHOD(clknode_set_gate, aw_clk_nm_set_gate),
CLKNODEMETHOD(clknode_set_mux, aw_clk_nm_set_mux),
CLKNODEMETHOD(clknode_recalc_freq, aw_clk_nm_recalc),
CLKNODEMETHOD(clknode_set_freq, aw_clk_nm_set_freq),
CLKNODEMETHOD_END
};
DEFINE_CLASS_1(aw_nm_clknode, aw_nm_clknode_class, aw_nm_clknode_methods,
sizeof(struct aw_clk_nm_sc), clknode_class);
int
aw_clk_nm_register(struct clkdom *clkdom, struct aw_clk_nm_def *clkdef)
{
struct clknode *clk;
struct aw_clk_nm_sc *sc;
clk = clknode_create(clkdom, &aw_nm_clknode_class, &clkdef->clkdef);
if (clk == NULL)
return (1);
sc = clknode_get_softc(clk);
sc->offset = clkdef->offset;
sc->m.shift = clkdef->m.shift;
sc->m.width = clkdef->m.width;
sc->m.mask = ((1 << sc->m.width) - 1) << sc->m.shift;
sc->m.value = clkdef->m.value;
sc->m.flags = clkdef->m.flags;
sc->n.shift = clkdef->n.shift;
sc->n.width = clkdef->n.width;
sc->n.mask = ((1 << sc->n.width) - 1) << sc->n.shift;
sc->n.value = clkdef->n.value;
sc->n.flags = clkdef->n.flags;
sc->prediv.shift = clkdef->prediv.shift;
sc->prediv.width = clkdef->prediv.width;
sc->prediv.mask = ((1 << sc->prediv.width) - 1) << sc->prediv.shift;
sc->prediv.value = clkdef->prediv.value;
sc->prediv.flags = clkdef->prediv.flags;
sc->prediv.cond_shift = clkdef->prediv.cond_shift;
if (clkdef->prediv.cond_width != 0)
sc->prediv.cond_mask = ((1 << clkdef->prediv.cond_width) - 1) << sc->prediv.shift;
else
sc->prediv.cond_mask = clkdef->prediv.cond_mask;
sc->prediv.cond_value = clkdef->prediv.cond_value;
sc->mux_shift = clkdef->mux_shift;
sc->mux_mask = ((1 << clkdef->mux_width) - 1) << sc->mux_shift;
sc->gate_shift = clkdef->gate_shift;
sc->lock_shift = clkdef->lock_shift;
sc->lock_retries = clkdef->lock_retries;
sc->flags = clkdef->flags;
clknode_register(clkdom, clk);
return (0);
}