dac935533b
In some cases, the driver must handle given properties located in specific OF subnode. Instead of creating duplicate set of function, add 'node' as argument to existing functions, defaulting it to device OF node. MFC after: 3 weeks
162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/*-
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* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
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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 ``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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/*
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* Allwinner CPU clock
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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/systm.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <machine/bus.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 <dev/ofw/ofw_subr.h>
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#include <dev/extres/clk/clk_mux.h>
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#define CPU_CLK_SRC_SEL_WIDTH 2
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#define CPU_CLK_SRC_SEL_SHIFT 16
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static int
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aw_cpuclk_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_is_compatible(dev, "allwinner,sun4i-a10-cpu-clk"))
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return (ENXIO);
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device_set_desc(dev, "Allwinner CPU Clock");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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aw_cpuclk_attach(device_t dev)
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{
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struct clk_mux_def def;
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struct clkdom *clkdom;
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bus_addr_t paddr;
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bus_size_t psize;
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phandle_t node;
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int error, ncells, i;
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clk_t clk;
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node = ofw_bus_get_node(dev);
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if (ofw_reg_to_paddr(node, 0, &paddr, &psize, NULL) != 0) {
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device_printf(dev, "cannot parse 'reg' property\n");
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return (ENXIO);
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}
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error = ofw_bus_parse_xref_list_get_length(node, "clocks",
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"#clock-cells", &ncells);
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if (error != 0) {
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device_printf(dev, "cannot get clock count\n");
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return (error);
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}
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clkdom = clkdom_create(dev);
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memset(&def, 0, sizeof(def));
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def.clkdef.id = 1;
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def.clkdef.parent_names = malloc(sizeof(char *) * ncells, M_OFWPROP,
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M_WAITOK);
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for (i = 0; i < ncells; i++) {
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error = clk_get_by_ofw_index(dev, 0, i, &clk);
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if (error != 0) {
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device_printf(dev, "cannot get clock %d\n", i);
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goto fail;
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}
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def.clkdef.parent_names[i] = clk_get_name(clk);
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clk_release(clk);
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}
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def.clkdef.parent_cnt = ncells;
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def.offset = paddr;
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def.shift = CPU_CLK_SRC_SEL_SHIFT;
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def.width = CPU_CLK_SRC_SEL_WIDTH;
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error = clk_parse_ofw_clk_name(dev, node, &def.clkdef.name);
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if (error != 0) {
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device_printf(dev, "cannot parse clock name\n");
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error = ENXIO;
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goto fail;
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}
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error = clknode_mux_register(clkdom, &def);
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if (error != 0) {
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device_printf(dev, "cannot register mux clock\n");
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error = ENXIO;
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goto fail;
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}
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if (clkdom_finit(clkdom) != 0) {
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device_printf(dev, "cannot finalize clkdom initialization\n");
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error = ENXIO;
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goto fail;
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}
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OF_prop_free(__DECONST(char *, def.clkdef.parent_names));
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OF_prop_free(__DECONST(char *, def.clkdef.name));
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if (bootverbose)
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clkdom_dump(clkdom);
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return (0);
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fail:
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OF_prop_free(__DECONST(char *, def.clkdef.name));
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return (error);
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}
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static device_method_t aw_cpuclk_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, aw_cpuclk_probe),
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DEVMETHOD(device_attach, aw_cpuclk_attach),
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DEVMETHOD_END
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};
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static driver_t aw_cpuclk_driver = {
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"aw_cpuclk",
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aw_cpuclk_methods,
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0
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};
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static devclass_t aw_cpuclk_devclass;
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EARLY_DRIVER_MODULE(aw_cpuclk, simplebus, aw_cpuclk_driver,
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aw_cpuclk_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);
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