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freebsd-dev/sys/dev/extres/clk/clk_mux.c

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Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
/*-
* 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_mux.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)
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
#define DEVICE_LOCK(_clk) \
CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
#define DEVICE_UNLOCK(_clk) \
CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
static int clknode_mux_init(struct clknode *clk, device_t dev);
static int clknode_mux_set_mux(struct clknode *clk, int idx);
struct clknode_mux_sc {
uint32_t offset;
uint32_t shift;
uint32_t mask;
int mux_flags;
};
static clknode_method_t clknode_mux_methods[] = {
/* Device interface */
CLKNODEMETHOD(clknode_init, clknode_mux_init),
CLKNODEMETHOD(clknode_set_mux, clknode_mux_set_mux),
CLKNODEMETHOD_END
};
DEFINE_CLASS_1(clknode_mux, clknode_mux_class, clknode_mux_methods,
sizeof(struct clknode_mux_sc), clknode_class);
static int
clknode_mux_init(struct clknode *clk, device_t dev)
{
uint32_t reg;
struct clknode_mux_sc *sc;
int rv;
sc = clknode_get_softc(clk);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
DEVICE_LOCK(clk);
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
rv = RD4(clk, sc->offset, &reg);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
DEVICE_UNLOCK(clk);
if (rv != 0) {
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
return (rv);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
}
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
reg = (reg >> sc->shift) & sc->mask;
clknode_init_parent_idx(clk, reg);
return(0);
}
static int
clknode_mux_set_mux(struct clknode *clk, int idx)
{
uint32_t reg;
struct clknode_mux_sc *sc;
int rv;
sc = clknode_get_softc(clk);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
DEVICE_LOCK(clk);
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
rv = MD4(clk, sc->offset, sc->mask << sc->shift,
(idx & sc->mask) << sc->shift);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
if (rv != 0) {
DEVICE_UNLOCK(clk);
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
return (rv);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
}
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
RD4(clk, sc->offset, &reg);
CLK: Add and use explicit locking for access to clock device registers. Implicit locking (for read/write/modify) is not sufficient for complex cases.
2016-03-15 15:28:24 +00:00
DEVICE_UNLOCK(clk);
Add clock framework, a first part of new 'extended resources' family of support frameworks(i.e. reset/regulators/phy/tsensors/fuses...). The clock framework significantly simplifies handling of complex clock structures found in modern SoCs. It provides the unified consumers interface, holds and manages actual clock topology, frequency and gating. It's tested on three different ARM boards (Nvidia Tegra TK1, Inforce 6410 and Odroid XU2) and on one MIPS board (Creator Ci20) by kan@. The framework is still far from perfect and probably doesn't have stable interface yet, but we want to start testing it on more real boards and different architectures. Reviewed by: ian, kan (earlier version)
2016-01-24 11:00:38 +00:00
return(0);
}
int
clknode_mux_register(struct clkdom *clkdom, struct clk_mux_def *clkdef)
{
struct clknode *clk;
struct clknode_mux_sc *sc;
clk = clknode_create(clkdom, &clknode_mux_class, &clkdef->clkdef);
if (clk == NULL)
return (1);
sc = clknode_get_softc(clk);
sc->offset = clkdef->offset;
sc->shift = clkdef->shift;
sc->mask = (1 << clkdef->width) - 1;
sc->mux_flags = clkdef->mux_flags;
clknode_register(clkdom, clk);
return (0);
}
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