Differential D36453 Diff 110249 sys/arm/mv/clk/armada38x_gen.c

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sys/arm/mv/clk/armada38x_gen.c

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				/*-
				* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				*
				* Copyright (c) 2022 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 ``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.
				*/

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

				#include <sys/param.h>
				#include <sys/systm.h>
				#include <sys/bus.h>

				#include <machine/bus.h>

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

				#include <arm/mv/clk/armada38x_gen.h>

				#include "clkdev_if.h"

				#define SAR_A38X_TCLK_FREQ_SHIFT 15
				#define SAR_A38X_TCLK_FREQ_MASK 0x00008000

				#define TCLK_250MHZ 250 * 1000 * 1000
				#define TCLK_200MHZ 200 * 1000 * 1000

				#define WR4(_clk, offset, val) \
				CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val)
				#define RD4(_clk, offset, val) \
				CLKDEV_READ_4(clknode_get_device(_clk), offset, val)
				#define DEVICE_LOCK(_clk) \
				CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
				#define DEVICE_UNLOCK(_clk) \
				CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))

				static int
				armada38x_gen_recalc(struct clknode clk, uint64_t freq)
				{
				uint32_t reg;

				DEVICE_LOCK(clk);
				RD4(clk, 0, &reg);
				DEVICE_UNLOCK(clk);

				reg = (reg & SAR_A38X_TCLK_FREQ_MASK) >> SAR_A38X_TCLK_FREQ_SHIFT;
				*freq = reg ? TCLK_200MHZ : TCLK_250MHZ;

				return (0);
				}

				static int
				armada38x_gen_init(struct clknode *clk, device_t dev)
				{
				return (0);
				}

				static clknode_method_t armada38x_gen_clknode_methods[] = {
				/* Device interface */
				CLKNODEMETHOD(clknode_init, armada38x_gen_init),
				CLKNODEMETHOD(clknode_recalc_freq, armada38x_gen_recalc),
				CLKNODEMETHOD_END
				};

				DEFINE_CLASS_1(armada38x_gen_clknode, armada38x_gen_clknode_class,
				armada38x_gen_clknode_methods, 0, clknode_class);

				int
				armada38x_gen_register(struct clkdom clkdom, const struct armada38x_gen_clknode_def clkdef)
				{
				struct clknode *clk;

				clk = clknode_create(clkdom, &armada38x_gen_clknode_class, &clkdef->def);
				if (clk == NULL)
				return (1);

				clknode_register(clkdom, clk);

				return(0);
				}