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/*-
* Copyright 2016 Michal Meloun <mmel@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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <machine/bus.h>
#include <dev/extres/clk/clk_gate.h>
#include "clkdev_if.h"
#define WR4(_clk, off, val) \
CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
#define RD4(_clk, off, val) \
CLKDEV_READ_4(clknode_get_device(_clk), off, val)
#define MD4(_clk, off, clr, set ) \
CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
#define DEVICE_LOCK(_clk) \
CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
#define DEVICE_UNLOCK(_clk) \
CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
static int clknode_gate_init(struct clknode *clk, device_t dev);
static int clknode_gate_set_gate(struct clknode *clk, bool enable);
struct clknode_gate_sc {
uint32_t offset;
uint32_t shift;
uint32_t mask;
uint32_t on_value;
uint32_t off_value;
int gate_flags;
bool ungated;
};
static clknode_method_t clknode_gate_methods[] = {
/* Device interface */
CLKNODEMETHOD(clknode_init, clknode_gate_init),
CLKNODEMETHOD(clknode_set_gate, clknode_gate_set_gate),
CLKNODEMETHOD_END
};
DEFINE_CLASS_1(clknode_gate, clknode_gate_class, clknode_gate_methods,
sizeof(struct clknode_gate_sc), clknode_class);
static int
clknode_gate_init(struct clknode *clk, device_t dev)
{
uint32_t reg;
struct clknode_gate_sc *sc;
int rv;
sc = clknode_get_softc(clk);
DEVICE_LOCK(clk);
rv = RD4(clk, sc->offset, ®);
DEVICE_UNLOCK(clk);
if (rv != 0)
return (rv);
reg = (reg >> sc->shift) & sc->mask;
sc->ungated = reg == sc->on_value ? 1 : 0;
clknode_init_parent_idx(clk, 0);
return(0);
}
static int
clknode_gate_set_gate(struct clknode *clk, bool enable)
{
uint32_t reg;
struct clknode_gate_sc *sc;
int rv;
sc = clknode_get_softc(clk);
sc->ungated = enable;
DEVICE_LOCK(clk);
rv = MD4(clk, sc->offset, sc->mask << sc->shift,
(sc->ungated ? sc->on_value : sc->off_value) << sc->shift);
if (rv != 0) {
DEVICE_UNLOCK(clk);
return (rv);
}
RD4(clk, sc->offset, ®);
DEVICE_UNLOCK(clk);
return(0);
}
int
clknode_gate_register(struct clkdom *clkdom, struct clk_gate_def *clkdef)
{
struct clknode *clk;
struct clknode_gate_sc *sc;
clk = clknode_create(clkdom, &clknode_gate_class, &clkdef->clkdef);
if (clk == NULL)
return (1);
sc = clknode_get_softc(clk);
sc->offset = clkdef->offset;
sc->shift = clkdef->shift;
sc->mask = clkdef->mask;
sc->on_value = clkdef->on_value;
sc->off_value = clkdef->off_value;
sc->gate_flags = clkdef->gate_flags;
clknode_register(clkdom, clk);
return (0);
}
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