Linux Audio

Check our new training course

Loading...
Note: File does not exist in v3.5.6.
 1/*
 2 * This file is provided under a dual BSD/GPLv2 license.  When using or
 3 * redistributing this file, you may do so under either license.
 4 *
 5 * GPL LICENSE SUMMARY
 6 *
 7 * Copyright (c) 2016 AmLogic, Inc.
 8 * Author: Michael Turquette <mturquette@baylibre.com>
 9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of version 2 of the GNU General Public License as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
22 * The full GNU General Public License is included in this distribution
23 * in the file called COPYING
24 *
25 * BSD LICENSE
26 *
27 * Copyright (c) 2016 AmLogic, Inc.
28 * Author: Michael Turquette <mturquette@baylibre.com>
29 *
30 * Redistribution and use in source and binary forms, with or without
31 * modification, are permitted provided that the following conditions
32 * are met:
33 *
34 *   * Redistributions of source code must retain the above copyright
35 *     notice, this list of conditions and the following disclaimer.
36 *   * Redistributions in binary form must reproduce the above copyright
37 *     notice, this list of conditions and the following disclaimer in
38 *     the documentation and/or other materials provided with the
39 *     distribution.
40 *   * Neither the name of Intel Corporation nor the names of its
41 *     contributors may be used to endorse or promote products derived
42 *     from this software without specific prior written permission.
43 *
44 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
45 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
46 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
47 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
48 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
49 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
50 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
51 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
52 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
53 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
54 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
55 */
56
57/*
58 * MultiPhase Locked Loops are outputs from a PLL with additional frequency
59 * scaling capabilities. MPLL rates are calculated as:
60 *
61 * f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
62 */
63
64#include <linux/clk-provider.h>
65#include "clkc.h"
66
67#define SDM_MAX 16384
68
69#define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw)
70
71static unsigned long mpll_recalc_rate(struct clk_hw *hw,
72		unsigned long parent_rate)
73{
74	struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
75	struct parm *p;
76	unsigned long rate = 0;
77	unsigned long reg, sdm, n2;
78
79	p = &mpll->sdm;
80	reg = readl(mpll->base + p->reg_off);
81	sdm = PARM_GET(p->width, p->shift, reg);
82
83	p = &mpll->n2;
84	reg = readl(mpll->base + p->reg_off);
85	n2 = PARM_GET(p->width, p->shift, reg);
86
87	rate = (parent_rate * SDM_MAX) / ((SDM_MAX * n2) + sdm);
88
89	return rate;
90}
91
92const struct clk_ops meson_clk_mpll_ro_ops = {
93	.recalc_rate = mpll_recalc_rate,
94};