1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2023 Beckhoff Automation GmbH & Co. KG
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28 #include <sys/cdefs.h>
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33
34 #include <dev/clk/clk.h>
35
36 #include <dev/clk/xilinx/zynqmp_clk_fixed.h>
37
38 #include "clkdev_if.h"
39 #include "zynqmp_firmware_if.h"
40
41 struct zynqmp_clk_fixed_softc {
42 device_t firmware;
43 uint32_t id;
44 };
45
46 static int
zynqmp_clk_fixed_init(struct clknode * clk,device_t dev)47 zynqmp_clk_fixed_init(struct clknode *clk, device_t dev)
48 {
49
50 clknode_init_parent_idx(clk, 0);
51 return (0);
52 }
53
54 static int
zynqmp_clk_fixed_recalc(struct clknode * clk,uint64_t * freq)55 zynqmp_clk_fixed_recalc(struct clknode *clk, uint64_t *freq)
56 {
57 struct zynqmp_clk_fixed_softc *sc;
58 uint32_t mult, div;
59 int rv;
60
61 sc = clknode_get_softc(clk);
62 rv = ZYNQMP_FIRMWARE_CLOCK_GET_FIXEDFACTOR(sc->firmware, sc->id, &mult, &div);
63 if (rv != 0) {
64 printf("%s: Error while getting fixed factor for %s\n",
65 __func__,
66 clknode_get_name(clk));
67 return (EINVAL);
68 }
69
70 *freq = (*freq * mult) / div;
71 return (0);
72 }
73
74 static clknode_method_t zynqmp_clk_fixed_clknode_methods[] = {
75 /* Device interface */
76 CLKNODEMETHOD(clknode_init, zynqmp_clk_fixed_init),
77 CLKNODEMETHOD(clknode_recalc_freq, zynqmp_clk_fixed_recalc),
78 CLKNODEMETHOD_END
79 };
80
81 DEFINE_CLASS_1(zynqmp_clk_fixed_clknode, zynqmp_clk_fixed_clknode_class,
82 zynqmp_clk_fixed_clknode_methods, sizeof(struct zynqmp_clk_fixed_softc), clknode_class);
83
84 int
zynqmp_clk_fixed_register(struct clkdom * clkdom,device_t fw,struct clknode_init_def * clkdef)85 zynqmp_clk_fixed_register(struct clkdom *clkdom, device_t fw, struct clknode_init_def *clkdef)
86 {
87 struct clknode *clk;
88 struct zynqmp_clk_fixed_softc *sc;
89 uint32_t fw_clk_id;
90
91 fw_clk_id = clkdef->id - 1;
92 clkdef->id = 0;
93 clk = clknode_create(clkdom, &zynqmp_clk_fixed_clknode_class, clkdef);
94 if (clk == NULL)
95 return (1);
96 sc = clknode_get_softc(clk);
97 sc->id = fw_clk_id;
98 sc->firmware = fw;
99 clknode_register(clkdom, clk);
100 return (0);
101 }
102