1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2022 Semihalf.
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 ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33
34 #include <machine/bus.h>
35
36 #include <dev/extres/clk/clk.h>
37
38 #include <arm/mv/clk/armada38x_gen.h>
39
40 #include "clkdev_if.h"
41
42 #define SAR_A38X_TCLK_FREQ_SHIFT 15
43 #define SAR_A38X_TCLK_FREQ_MASK 0x00008000
44
45 #define TCLK_250MHZ 250 * 1000 * 1000
46 #define TCLK_200MHZ 200 * 1000 * 1000
47
48 #define WR4(_clk, offset, val) \
49 CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val)
50 #define RD4(_clk, offset, val) \
51 CLKDEV_READ_4(clknode_get_device(_clk), offset, val)
52 #define DEVICE_LOCK(_clk) \
53 CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
54 #define DEVICE_UNLOCK(_clk) \
55 CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
56
57 static int
58 armada38x_gen_recalc(struct clknode *clk, uint64_t *freq)
59 {
60 uint32_t reg;
61
62 DEVICE_LOCK(clk);
63 RD4(clk, 0, ®);
64 DEVICE_UNLOCK(clk);
65
66 reg = (reg & SAR_A38X_TCLK_FREQ_MASK) >> SAR_A38X_TCLK_FREQ_SHIFT;
67 *freq = reg ? TCLK_200MHZ : TCLK_250MHZ;
68
69 return (0);
70 }
71
72 static int
73 armada38x_gen_init(struct clknode *clk, device_t dev)
74 {
75 return (0);
76 }
77
78 static clknode_method_t armada38x_gen_clknode_methods[] = {
79 /* Device interface */
80 CLKNODEMETHOD(clknode_init, armada38x_gen_init),
81 CLKNODEMETHOD(clknode_recalc_freq, armada38x_gen_recalc),
82 CLKNODEMETHOD_END
83 };
84
85 DEFINE_CLASS_1(armada38x_gen_clknode, armada38x_gen_clknode_class,
86 armada38x_gen_clknode_methods, 0, clknode_class);
87
88 int
89 armada38x_gen_register(struct clkdom *clkdom, const struct armada38x_gen_clknode_def *clkdef)
90 {
91 struct clknode *clk;
92
93 clk = clknode_create(clkdom, &armada38x_gen_clknode_class, &clkdef->def);
94 if (clk == NULL)
95 return (1);
96
97 clknode_register(clkdom, clk);
98
99 return(0);
100 }
Cache object: dc5fc475971ae0308ac1bf4ad4c8c7dd
|