xref: /freebsd/sys/arm/mv/clk/armada38x_gen.c (revision 02e9120893770924227138ba49df1edb3896112a)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
28 #include <sys/systm.h>
29 #include <sys/bus.h>
30 
31 #include <machine/bus.h>
32 
33 #include <dev/extres/clk/clk.h>
34 
35 #include <arm/mv/clk/armada38x_gen.h>
36 
37 #include "clkdev_if.h"
38 
39 #define SAR_A38X_TCLK_FREQ_SHIFT	15
40 #define SAR_A38X_TCLK_FREQ_MASK		0x00008000
41 
42 #define TCLK_250MHZ					250 * 1000 * 1000
43 #define TCLK_200MHZ					200 * 1000 * 1000
44 
45 #define	WR4(_clk, offset, val)					\
46 	CLKDEV_WRITE_4(clknode_get_device(_clk), offset, val)
47 #define	RD4(_clk, offset, val)					\
48 	CLKDEV_READ_4(clknode_get_device(_clk), offset, val)
49 #define	DEVICE_LOCK(_clk)					\
50 	CLKDEV_DEVICE_LOCK(clknode_get_device(_clk))
51 #define	DEVICE_UNLOCK(_clk)					\
52 	CLKDEV_DEVICE_UNLOCK(clknode_get_device(_clk))
53 
54 static int
55 armada38x_gen_recalc(struct clknode *clk, uint64_t *freq)
56 {
57 	uint32_t reg;
58 
59 	DEVICE_LOCK(clk);
60 	RD4(clk, 0, &reg);
61 	DEVICE_UNLOCK(clk);
62 
63 	reg = (reg & SAR_A38X_TCLK_FREQ_MASK) >> SAR_A38X_TCLK_FREQ_SHIFT;
64 	*freq = reg ? TCLK_200MHZ : TCLK_250MHZ;
65 
66 	return (0);
67 }
68 
69 static int
70 armada38x_gen_init(struct clknode *clk, device_t dev)
71 {
72 	return (0);
73 }
74 
75 static clknode_method_t armada38x_gen_clknode_methods[] = {
76 	/* Device interface */
77 	CLKNODEMETHOD(clknode_init,		armada38x_gen_init),
78 	CLKNODEMETHOD(clknode_recalc_freq,	armada38x_gen_recalc),
79 	CLKNODEMETHOD_END
80 };
81 
82 DEFINE_CLASS_1(armada38x_gen_clknode, armada38x_gen_clknode_class,
83     armada38x_gen_clknode_methods, 0, clknode_class);
84 
85 int
86 armada38x_gen_register(struct clkdom *clkdom, const struct armada38x_gen_clknode_def *clkdef)
87 {
88 	struct clknode *clk;
89 
90 	clk = clknode_create(clkdom, &armada38x_gen_clknode_class, &clkdef->def);
91 	if (clk == NULL)
92 		return (1);
93 
94 	clknode_register(clkdom, clk);
95 
96 	return(0);
97 }
98