12a05f9a86
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)
127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/*-
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* Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/conf.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <machine/bus.h>
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#include <dev/extres/clk/clk_gate.h>
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#include "clkdev_if.h"
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#define WR4(_clk, off, val) \
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CLKDEV_WRITE_4(clknode_get_device(_clk), off, val)
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#define RD4(_clk, off, val) \
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CLKDEV_READ_4(clknode_get_device(_clk), off, val)
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#define MD4(_clk, off, clr, set ) \
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CLKDEV_MODIFY_4(clknode_get_device(_clk), off, clr, set)
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static int clknode_gate_init(struct clknode *clk, device_t dev);
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static int clknode_gate_set_gate(struct clknode *clk, bool enable);
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struct clknode_gate_sc {
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uint32_t offset;
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uint32_t shift;
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uint32_t mask;
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uint32_t on_value;
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uint32_t off_value;
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int gate_flags;
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bool ungated;
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};
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static clknode_method_t clknode_gate_methods[] = {
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/* Device interface */
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CLKNODEMETHOD(clknode_init, clknode_gate_init),
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CLKNODEMETHOD(clknode_set_gate, clknode_gate_set_gate),
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CLKNODEMETHOD_END
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};
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DEFINE_CLASS_1(clknode_gate, clknode_gate_class, clknode_gate_methods,
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sizeof(struct clknode_gate_sc), clknode_class);
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static int
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clknode_gate_init(struct clknode *clk, device_t dev)
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{
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uint32_t reg;
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struct clknode_gate_sc *sc;
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int rv;
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sc = clknode_get_softc(clk);
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rv = RD4(clk, sc->offset, ®);
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if (rv != 0)
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return (rv);
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reg = (reg >> sc->shift) & sc->mask;
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sc->ungated = reg == sc->on_value ? 1 : 0;
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clknode_init_parent_idx(clk, 0);
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return(0);
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}
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static int
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clknode_gate_set_gate(struct clknode *clk, bool enable)
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{
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uint32_t reg;
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struct clknode_gate_sc *sc;
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int rv;
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sc = clknode_get_softc(clk);
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sc->ungated = enable;
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rv = MD4(clk, sc->offset, sc->mask << sc->shift,
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(sc->ungated ? sc->on_value : sc->off_value) << sc->shift);
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if (rv != 0)
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return (rv);
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RD4(clk, sc->offset, ®);
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return(0);
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}
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int
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clknode_gate_register(struct clkdom *clkdom, struct clk_gate_def *clkdef)
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{
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struct clknode *clk;
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struct clknode_gate_sc *sc;
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clk = clknode_create(clkdom, &clknode_gate_class, &clkdef->clkdef);
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if (clk == NULL)
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return (1);
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sc = clknode_get_softc(clk);
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sc->offset = clkdef->offset;
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sc->shift = clkdef->shift;
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sc->mask = clkdef->mask;
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sc->on_value = clkdef->on_value;
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sc->off_value = clkdef->off_value;
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sc->gate_flags = clkdef->gate_flags;
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clknode_register(clkdom, clk);
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return (0);
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}
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