Differential D5752 Diff 14954 head/sys/arm/allwinner/clk/aw_cpuclk.c

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head/sys/arm/allwinner/clk/aw_cpuclk.c

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				/*-
				* Copyright (c) 2016 Jared McNeill <jmcneill@invisible.ca>
				* 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 ``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.
				*
				* $FreeBSD$
				*/

				/*
				* Allwinner CPU clock
				*/

				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/systm.h>
				#include <sys/bus.h>
				#include <sys/rman.h>
				#include <sys/kernel.h>
				#include <sys/module.h>
				#include <machine/bus.h>

				#include <dev/ofw/ofw_bus.h>
				#include <dev/ofw/ofw_bus_subr.h>
				#include <dev/ofw/ofw_subr.h>

				#include <dev/extres/clk/clk_mux.h>

				#define CPU_CLK_SRC_SEL_WIDTH 2
				#define CPU_CLK_SRC_SEL_SHIFT 16

				static int
				aw_cpuclk_probe(device_t dev)
				{
				if (!ofw_bus_status_okay(dev))
				return (ENXIO);

				if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-cpu-clk"))
				return (ENXIO);

				device_set_desc(dev, "Allwinner CPU Clock");
				return (BUS_PROBE_DEFAULT);
				}

				static int
				aw_cpuclk_attach(device_t dev)
				{
				struct clk_mux_def def;
				struct clkdom *clkdom;
				bus_addr_t paddr;
				bus_size_t psize;
				phandle_t node;
				int error, ncells, i;
				clk_t clk;

				node = ofw_bus_get_node(dev);

				if (ofw_reg_to_paddr(node, 0, &paddr, &psize, NULL) != 0) {
				device_printf(dev, "cannot parse 'reg' property\n");
				return (ENXIO);
				}

				error = ofw_bus_parse_xref_list_get_length(node, "clocks",
				"#clock-cells", &ncells);
				if (error != 0) {
				device_printf(dev, "cannot get clock count\n");
				return (error);
				}

				clkdom = clkdom_create(dev);

				memset(&def, 0, sizeof(def));
				def.clkdef.id = 1;
				def.clkdef.parent_names = malloc(sizeof(char ) ncells, M_OFWPROP,
				M_WAITOK);
				for (i = 0; i < ncells; i++) {
				error = clk_get_by_ofw_index(dev, i, &clk);
				if (error != 0) {
				device_printf(dev, "cannot get clock %d\n", i);
				goto fail;
				}
				def.clkdef.parent_names[i] = clk_get_name(clk);
				clk_release(clk);
				}
				def.clkdef.parent_cnt = ncells;
				def.offset = paddr;
				def.shift = CPU_CLK_SRC_SEL_SHIFT;
				def.width = CPU_CLK_SRC_SEL_WIDTH;

				error = clk_parse_ofw_clk_name(dev, node, &def.clkdef.name);
				if (error != 0) {
				device_printf(dev, "cannot parse clock name\n");
				error = ENXIO;
				goto fail;
				}

				error = clknode_mux_register(clkdom, &def);
				if (error != 0) {
				device_printf(dev, "cannot register mux clock\n");
				error = ENXIO;
				goto fail;
				}

				if (clkdom_finit(clkdom) != 0) {
				device_printf(dev, "cannot finalize clkdom initialization\n");
				error = ENXIO;
				goto fail;
				}

				free(__DECONST(char *, def.clkdef.parent_names), M_OFWPROP);
				free(__DECONST(char *, def.clkdef.name), M_OFWPROP);

				if (bootverbose)
				clkdom_dump(clkdom);

				return (0);

				fail:
				free(__DECONST(char *, def.clkdef.name), M_OFWPROP);
				return (error);
				}

				static device_method_t aw_cpuclk_methods[] = {
				/* Device interface */
				DEVMETHOD(device_probe, aw_cpuclk_probe),
				DEVMETHOD(device_attach, aw_cpuclk_attach),

				DEVMETHOD_END
				};

				static driver_t aw_cpuclk_driver = {
				"aw_cpuclk",
				aw_cpuclk_methods,
				0
				};

				static devclass_t aw_cpuclk_devclass;

				EARLY_DRIVER_MODULE(aw_cpuclk, simplebus, aw_cpuclk_driver,
				aw_cpuclk_devclass, 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE);