95 строки
3.5 KiB
C
95 строки
3.5 KiB
C
/*
|
|
* This file is provided under a dual BSD/GPLv2 license. When using or
|
|
* redistributing this file, you may do so under either license.
|
|
*
|
|
* GPL LICENSE SUMMARY
|
|
*
|
|
* Copyright (c) 2016 AmLogic, Inc.
|
|
* Author: Michael Turquette <mturquette@baylibre.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of version 2 of the GNU General Public License as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
|
|
* The full GNU General Public License is included in this distribution
|
|
* in the file called COPYING
|
|
*
|
|
* BSD LICENSE
|
|
*
|
|
* Copyright (c) 2016 AmLogic, Inc.
|
|
* Author: Michael Turquette <mturquette@baylibre.com>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* * Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* * Neither the name of Intel Corporation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* MultiPhase Locked Loops are outputs from a PLL with additional frequency
|
|
* scaling capabilities. MPLL rates are calculated as:
|
|
*
|
|
* f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include "clkc.h"
|
|
|
|
#define SDM_MAX 16384
|
|
|
|
#define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw)
|
|
|
|
static unsigned long mpll_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
|
|
struct parm *p;
|
|
unsigned long rate = 0;
|
|
unsigned long reg, sdm, n2;
|
|
|
|
p = &mpll->sdm;
|
|
reg = readl(mpll->base + p->reg_off);
|
|
sdm = PARM_GET(p->width, p->shift, reg);
|
|
|
|
p = &mpll->n2;
|
|
reg = readl(mpll->base + p->reg_off);
|
|
n2 = PARM_GET(p->width, p->shift, reg);
|
|
|
|
rate = (parent_rate * SDM_MAX) / ((SDM_MAX * n2) + sdm);
|
|
|
|
return rate;
|
|
}
|
|
|
|
const struct clk_ops meson_clk_mpll_ro_ops = {
|
|
.recalc_rate = mpll_recalc_rate,
|
|
};
|