1/* $NetBSD: sunxi_ccu_fixed_factor.c,v 1.2 2018/05/08 22:05:25 jmcneill Exp $ */
2
3/*-
4 * Copyright (c) 2017 Jared McNeill <jmcneill@invisible.ca>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__KERNEL_RCSID(0, "$NetBSD: sunxi_ccu_fixed_factor.c,v 1.2 2018/05/08 22:05:25 jmcneill Exp $");
31
32#include <sys/param.h>
33#include <sys/bus.h>
34
35#include <dev/clk/clk_backend.h>
36
37#include <arm/sunxi/sunxi_ccu.h>
38
39static u_int
40sunxi_ccu_fixed_factor_get_parent_rate(struct clk *clkp)
41{
42	struct clk *clkp_parent;
43
44	clkp_parent = clk_get_parent(clkp);
45	if (clkp_parent == NULL)
46		return 0;
47
48	return clk_get_rate(clkp_parent);
49}
50
51u_int
52sunxi_ccu_fixed_factor_get_rate(struct sunxi_ccu_softc *sc,
53    struct sunxi_ccu_clk *clk)
54{
55	struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor;
56	struct clk *clkp = &clk->base;
57
58	KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR);
59
60	const u_int p_rate = sunxi_ccu_fixed_factor_get_parent_rate(clkp);
61	if (p_rate == 0)
62		return 0;
63
64	return (u_int)(((uint64_t)p_rate * fixed_factor->mult) / fixed_factor->div);
65}
66
67static int
68sunxi_ccu_fixed_factor_set_parent_rate(struct clk *clkp, u_int rate)
69{
70	struct clk *clkp_parent;
71
72	clkp_parent = clk_get_parent(clkp);
73	if (clkp_parent == NULL)
74		return ENXIO;
75
76	return clk_set_rate(clkp_parent, rate);
77}
78
79int
80sunxi_ccu_fixed_factor_set_rate(struct sunxi_ccu_softc *sc,
81    struct sunxi_ccu_clk *clk, u_int rate)
82{
83	struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor;
84	struct clk *clkp = &clk->base;
85
86	KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR);
87
88	rate *= fixed_factor->div;
89	rate /= fixed_factor->mult;
90
91	return sunxi_ccu_fixed_factor_set_parent_rate(clkp, rate);
92}
93
94const char *
95sunxi_ccu_fixed_factor_get_parent(struct sunxi_ccu_softc *sc,
96    struct sunxi_ccu_clk *clk)
97{
98	struct sunxi_ccu_fixed_factor *fixed_factor = &clk->u.fixed_factor;
99
100	KASSERT(clk->type == SUNXI_CCU_FIXED_FACTOR);
101
102	return fixed_factor->parent;
103}
104