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/*-
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
*
* 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/conf.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/systm.h>
#include <sys/libkern.h>
#include <sys/types.h>
#include <sys/malloc.h>
#include <machine/bus.h>
#include <dev/fdt/simplebus.h>
#include <dev/extres/clk/clk_mux.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "clock_common.h"
#if 0
#define DPRINTF(dev, msg...) device_printf(dev, msg)
#else
#define DPRINTF(dev, msg...)
#endif
/*
* Devicetree description
* Documentation/devicetree/bindings/clock/ti/mux.txt
*/
struct ti_mux_softc {
device_t sc_dev;
bool attach_done;
struct clk_mux_def mux_def;
struct clock_cell_info clock_cell;
struct clkdom *clkdom;
};
static int ti_mux_probe(device_t dev);
static int ti_mux_attach(device_t dev);
static int ti_mux_detach(device_t dev);
#define TI_MUX_CLOCK 2
#define TI_COMPOSITE_MUX_CLOCK 1
#define TI_MUX_END 0
static struct ofw_compat_data compat_data[] = {
{ "ti,mux-clock", TI_MUX_CLOCK },
{ "ti,composite-mux-clock", TI_COMPOSITE_MUX_CLOCK },
{ NULL, TI_MUX_END }
};
static int
ti_mux_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
return (ENXIO);
device_set_desc(dev, "TI Mux Clock");
return (BUS_PROBE_DEFAULT);
}
static int
register_clk(struct ti_mux_softc *sc) {
int err;
sc->clkdom = clkdom_create(sc->sc_dev);
if (sc->clkdom == NULL) {
DPRINTF(sc->sc_dev, "Failed to create clkdom\n");
return ENXIO;
}
err = clknode_mux_register(sc->clkdom, &sc->mux_def);
if (err) {
DPRINTF(sc->sc_dev, "clknode_mux_register failed %x\n", err);
return ENXIO;
}
err = clkdom_finit(sc->clkdom);
if (err) {
DPRINTF(sc->sc_dev, "Clk domain finit fails %x.\n", err);
return ENXIO;
}
return 0;
}
static int
ti_mux_attach(device_t dev)
{
struct ti_mux_softc *sc;
phandle_t node;
int err;
cell_t value;
sc = device_get_softc(dev);
sc->sc_dev = dev;
node = ofw_bus_get_node(dev);
/* Grab the content of reg properties */
OF_getencprop(node, "reg", &value, sizeof(value));
sc->mux_def.offset = value;
if (OF_hasprop(node, "ti,bit-shift")) {
OF_getencprop(node, "ti,bit-shift", &value, sizeof(value));
sc->mux_def.shift = value;
DPRINTF(sc->sc_dev, "ti,bit-shift => shift %x\n", sc->mux_def.shift);
}
if (OF_hasprop(node, "ti,index-starts-at-one")) {
/* FIXME: Add support in dev/extres/clk */
/*sc->mux_def.mux_flags = ... */
device_printf(sc->sc_dev, "ti,index-starts-at-one - Not implemented\n");
}
if (OF_hasprop(node, "ti,set-rate-parent"))
device_printf(sc->sc_dev, "ti,set-rate-parent - Not implemented\n");
if (OF_hasprop(node, "ti,latch-bit"))
device_printf(sc->sc_dev, "ti,latch-bit - Not implemented\n");
read_clock_cells(sc->sc_dev, &sc->clock_cell);
create_clkdef(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
/* Figure out the width from ti_max_div */
if (sc->mux_def.mux_flags)
sc->mux_def.width = fls(sc->clock_cell.num_real_clocks-1);
else
sc->mux_def.width = fls(sc->clock_cell.num_real_clocks);
DPRINTF(sc->sc_dev, "sc->clock_cell.num_real_clocks %x def.width %x\n",
sc->clock_cell.num_real_clocks, sc->mux_def.width);
err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
if (err) {
/* free_clkdef will be called in ti_mux_new_pass */
DPRINTF(sc->sc_dev, "find_parent_clock_names failed\n");
return (bus_generic_attach(sc->sc_dev));
}
err = register_clk(sc);
if (err) {
/* free_clkdef will be called in ti_mux_new_pass */
DPRINTF(sc->sc_dev, "register_clk failed\n");
return (bus_generic_attach(sc->sc_dev));
}
sc->attach_done = true;
free_clkdef(&sc->mux_def.clkdef);
return (bus_generic_attach(sc->sc_dev));
}
static void
ti_mux_new_pass(device_t dev)
{
struct ti_mux_softc *sc;
int err;
sc = device_get_softc(dev);
if (sc->attach_done) {
return;
}
err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->mux_def.clkdef);
if (err) {
/* free_clkdef will be called in later call to ti_mux_new_pass */
DPRINTF(sc->sc_dev, "ti_mux_new_pass find_parent_clock_names failed\n");
return;
}
err = register_clk(sc);
if (err) {
/* free_clkdef will be called in later call to ti_mux_new_pass */
DPRINTF(sc->sc_dev, "ti_mux_new_pass register_clk failed\n");
return;
}
sc->attach_done = true;
free_clkdef(&sc->mux_def.clkdef);
}
static int
ti_mux_detach(device_t dev)
{
return (EBUSY);
}
static device_method_t ti_mux_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, ti_mux_probe),
DEVMETHOD(device_attach, ti_mux_attach),
DEVMETHOD(device_detach, ti_mux_detach),
/* Bus interface */
DEVMETHOD(bus_new_pass, ti_mux_new_pass),
DEVMETHOD_END
};
DEFINE_CLASS_0(ti_mux, ti_mux_driver, ti_mux_methods,
sizeof(struct ti_mux_softc));
static devclass_t ti_mux_devclass;
EARLY_DRIVER_MODULE(ti_mux, simplebus, ti_mux_driver,
ti_mux_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
MODULE_VERSION(ti_mux, 1);
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