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4e579ad047
Add clock and reset drivers for the ZynqMP SoC. The clocks are discovered by talking to the firmware as the topology isn't fixed on this SoC. Differential Revision: https://reviews.freebsd.org/D41812 Sponsored by: Beckhoff Automation GmbH & Co. KG
102 lines
3 KiB
C
102 lines
3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2023 Beckhoff Automation GmbH & Co. KG
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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#include <sys/cdefs.h>
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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 <dev/extres/clk/clk.h>
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#include <dev/clk/xilinx/zynqmp_clk_fixed.h>
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#include "clkdev_if.h"
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#include "zynqmp_firmware_if.h"
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struct zynqmp_clk_fixed_softc {
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device_t firmware;
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uint32_t id;
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};
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static int
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zynqmp_clk_fixed_init(struct clknode *clk, device_t dev)
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{
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clknode_init_parent_idx(clk, 0);
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return (0);
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}
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static int
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zynqmp_clk_fixed_recalc(struct clknode *clk, uint64_t *freq)
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{
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struct zynqmp_clk_fixed_softc *sc;
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uint32_t mult, div;
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int rv;
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sc = clknode_get_softc(clk);
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rv = ZYNQMP_FIRMWARE_CLOCK_GET_FIXEDFACTOR(sc->firmware, sc->id, &mult, &div);
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if (rv != 0) {
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printf("%s: Error while getting fixed factor for %s\n",
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__func__,
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clknode_get_name(clk));
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return (EINVAL);
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}
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*freq = (*freq * mult) / div;
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return (0);
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}
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static clknode_method_t zynqmp_clk_fixed_clknode_methods[] = {
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/* Device interface */
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CLKNODEMETHOD(clknode_init, zynqmp_clk_fixed_init),
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CLKNODEMETHOD(clknode_recalc_freq, zynqmp_clk_fixed_recalc),
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CLKNODEMETHOD_END
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};
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DEFINE_CLASS_1(zynqmp_clk_fixed_clknode, zynqmp_clk_fixed_clknode_class,
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zynqmp_clk_fixed_clknode_methods, sizeof(struct zynqmp_clk_fixed_softc), clknode_class);
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int
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zynqmp_clk_fixed_register(struct clkdom *clkdom, device_t fw, struct clknode_init_def *clkdef)
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{
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struct clknode *clk;
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struct zynqmp_clk_fixed_softc *sc;
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uint32_t fw_clk_id;
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fw_clk_id = clkdef->id - 1;
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clkdef->id = 0;
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clk = clknode_create(clkdom, &zynqmp_clk_fixed_clknode_class, clkdef);
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if (clk == NULL)
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return (1);
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sc = clknode_get_softc(clk);
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sc->id = fw_clk_id;
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sc->firmware = fw;
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clknode_register(clkdom, clk);
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return (0);
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}
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