mirror of https://github.com/F-Stack/f-stack.git
265 lines
6.9 KiB
C
265 lines
6.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2020 Oskar Holmlund <oskar.holmlund@ohdata.se>
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* 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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* $FreeBSD$
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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/module.h>
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#include <sys/systm.h>
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#include <sys/libkern.h>
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#include <machine/bus.h>
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#include <dev/fdt/simplebus.h>
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#include <dev/extres/clk/clk_div.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include "clock_common.h"
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#if 0
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#define DPRINTF(dev, msg...) device_printf(dev, msg)
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#else
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#define DPRINTF(dev, msg...)
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#endif
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/*
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* Devicetree description
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* Documentation/devicetree/bindings/clock/ti/divider.txt
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*/
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struct ti_divider_softc {
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device_t sc_dev;
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bool attach_done;
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struct clk_div_def div_def;
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struct clock_cell_info clock_cell;
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struct clkdom *clkdom;
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};
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static int ti_divider_probe(device_t dev);
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static int ti_divider_attach(device_t dev);
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static int ti_divider_detach(device_t dev);
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#define TI_DIVIDER_CLOCK 2
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#define TI_COMPOSITE_DIVIDER_CLOCK 1
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#define TI_DIVIDER_END 0
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static struct ofw_compat_data compat_data[] = {
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{ "ti,divider-clock", TI_DIVIDER_CLOCK },
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{ "ti,composite-divider-clock", TI_COMPOSITE_DIVIDER_CLOCK },
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{ NULL, TI_DIVIDER_END }
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};
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static int
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register_clk(struct ti_divider_softc *sc) {
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int err;
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sc->clkdom = clkdom_create(sc->sc_dev);
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if (sc->clkdom == NULL) {
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DPRINTF(sc->sc_dev, "Failed to create clkdom\n");
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return (ENXIO);
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}
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err = clknode_div_register(sc->clkdom, &sc->div_def);
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if (err) {
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DPRINTF(sc->sc_dev, "clknode_div_register failed %x\n", err);
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return (ENXIO);
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}
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err = clkdom_finit(sc->clkdom);
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if (err) {
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DPRINTF(sc->sc_dev, "Clk domain finit fails %x.\n", err);
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return (ENXIO);
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}
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return (0);
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}
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static int
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ti_divider_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
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return (ENXIO);
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device_set_desc(dev, "TI Divider Clock");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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ti_divider_attach(device_t dev)
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{
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struct ti_divider_softc *sc;
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phandle_t node;
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int err;
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cell_t value;
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uint32_t ti_max_div;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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node = ofw_bus_get_node(dev);
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/* Grab the content of reg properties */
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OF_getencprop(node, "reg", &value, sizeof(value));
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sc->div_def.offset = value;
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if (OF_hasprop(node, "ti,bit-shift")) {
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OF_getencprop(node, "ti,bit-shift", &value, sizeof(value));
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sc->div_def.i_shift = value;
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}
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if (OF_hasprop(node, "ti,index-starts-at-one")) {
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sc->div_def.div_flags = CLK_DIV_ZERO_BASED;
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}
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if (OF_hasprop(node, "ti,index-power-of-two")) {
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/* FIXME: later */
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device_printf(sc->sc_dev, "ti,index-power-of-two - Not implemented\n");
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/* remember to update i_width a few lines below */
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}
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if (OF_hasprop(node, "ti,max-div")) {
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OF_getencprop(node, "ti,max-div", &value, sizeof(value));
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ti_max_div = value;
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}
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if (OF_hasprop(node, "clock-output-names"))
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device_printf(sc->sc_dev, "clock-output-names\n");
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if (OF_hasprop(node, "ti,dividers"))
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device_printf(sc->sc_dev, "ti,dividers\n");
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if (OF_hasprop(node, "ti,min-div"))
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device_printf(sc->sc_dev, "ti,min-div - Not implemented\n");
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if (OF_hasprop(node, "ti,autoidle-shift"))
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device_printf(sc->sc_dev, "ti,autoidle-shift - Not implemented\n");
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if (OF_hasprop(node, "ti,set-rate-parent"))
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device_printf(sc->sc_dev, "ti,set-rate-parent - Not implemented\n");
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if (OF_hasprop(node, "ti,latch-bit"))
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device_printf(sc->sc_dev, "ti,latch-bit - Not implemented\n");
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/* Figure out the width from ti_max_div */
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if (sc->div_def.div_flags)
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sc->div_def.i_width = fls(ti_max_div-1);
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else
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sc->div_def.i_width = fls(ti_max_div);
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DPRINTF(sc->sc_dev, "div_def.i_width %x\n", sc->div_def.i_width);
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read_clock_cells(sc->sc_dev, &sc->clock_cell);
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create_clkdef(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
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err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
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if (err) {
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/* free_clkdef will be called in ti_divider_new_pass */
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DPRINTF(sc->sc_dev, "find_parent_clock_names failed\n");
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return (bus_generic_attach(sc->sc_dev));
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}
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err = register_clk(sc);
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if (err) {
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/* free_clkdef will be called in ti_divider_new_pass */
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DPRINTF(sc->sc_dev, "register_clk failed\n");
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return (bus_generic_attach(sc->sc_dev));
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}
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sc->attach_done = true;
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free_clkdef(&sc->div_def.clkdef);
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return (bus_generic_attach(sc->sc_dev));
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}
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static int
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ti_divider_detach(device_t dev)
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{
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return (EBUSY);
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}
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static void
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ti_divider_new_pass(device_t dev)
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{
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struct ti_divider_softc *sc;
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int err;
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sc = device_get_softc(dev);
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if (sc->attach_done) {
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return;
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}
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err = find_parent_clock_names(sc->sc_dev, &sc->clock_cell, &sc->div_def.clkdef);
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if (err) {
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/* free_clkdef will be called in a later call to ti_divider_new_pass */
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DPRINTF(sc->sc_dev, "new_pass find_parent_clock_names failed\n");
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return;
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}
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err = register_clk(sc);
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if (err) {
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/* free_clkdef will be called in a later call to ti_divider_new_pass */
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DPRINTF(sc->sc_dev, "new_pass register_clk failed\n");
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return;
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}
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sc->attach_done = true;
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free_clkdef(&sc->div_def.clkdef);
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}
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static device_method_t ti_divider_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, ti_divider_probe),
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DEVMETHOD(device_attach, ti_divider_attach),
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DEVMETHOD(device_detach, ti_divider_detach),
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/* Bus interface */
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DEVMETHOD(bus_new_pass, ti_divider_new_pass),
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DEVMETHOD_END
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};
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DEFINE_CLASS_0(ti_divider, ti_divider_driver, ti_divider_methods,
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sizeof(struct ti_divider_softc));
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static devclass_t ti_divider_devclass;
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EARLY_DRIVER_MODULE(ti_divider, simplebus, ti_divider_driver,
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ti_divider_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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MODULE_VERSION(ti_divider, 1);
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