Differential D32294 Diff 97288 sys/arm/mv/clk/periph_clk_fixed.c

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sys/arm/mv/clk/periph_clk_fixed.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2021 Semihalf.
				*
				* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
				*/

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

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

				#include <dev/fdt/simplebus.h>

				#include <dev/extres/clk/clk.h>
				#include <dev/extres/clk/clk_div.h>
				#include <dev/extres/clk/clk_fixed.h>
				#include <dev/extres/clk/clk_gate.h>
				#include <dev/extres/clk/clk_mux.h>

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

				#include "clkdev_if.h"
				#include "periph.h"

				#define PARENT_CNT 2

				/*
				* Register clock with fixed frequency divider clock. Chain consists of:
				* fixed clock (output from xtal/2) -> mux (choose fixed or xtal frequency)
				*/

				int
				a37x0_periph_fixed_register_fixed(struct clkdom *clkdom,
				struct a37x0_periph_clknode_def *device_def)
				{
				const char *parent_names[PARENT_CNT];
				struct clk_fixed_def fixed_def;
				struct clk_gate_def *gate;
				struct clk_mux_def *mux;
				const char *dev_name;
				int error, dev_id;

				dev_name = device_def->common_def.device_name;
				dev_id = device_def->common_def.device_id;
				mux = &device_def->clk_def.fixed.mux;
				gate = &device_def->clk_def.fixed.gate;
				fixed_def = device_def->clk_def.fixed.fixed;

				fixed_def.clkdef.parent_names = &device_def->common_def.xtal;
				fixed_def.clkdef.parent_cnt = 1;
				fixed_def.clkdef.id = A37x0_INTERNAL_CLK_ID(dev_id, FIXED1_POS);
				fixed_def.clkdef.flags = 0;
				fixed_def.mult = 1;
				fixed_def.div = 2;
				fixed_def.freq = 0;

				parent_names[0] = device_def->common_def.xtal;
				parent_names[1] = fixed_def.clkdef.name;

				error = clknode_fixed_register(clkdom, &fixed_def);
				if (error)
				goto fail;

				a37x0_periph_set_props(&mux->clkdef, parent_names ,PARENT_CNT);
				error = a37x0_periph_create_mux(clkdom, mux,
				A37x0_INTERNAL_CLK_ID(dev_id, MUX_POS));
				if (error)
				goto fail;

				a37x0_periph_set_props(&gate->clkdef, &mux->clkdef.name, 1);
				error = a37x0_periph_create_gate(clkdom, gate,
				dev_id);
				if (error)
				goto fail;

				fail:

				return (error);
				}