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007e6e5c5f
This patch adds new callbacks to the meson-mpll driver to control and set the pll rate. For this, we also need to add the enable bit and sdm enable bit. The corresponding parameters are added to mpll data structure. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Signed-off-by: Michael Turquette <mturquette@baylibre.com> Link: lkml.kernel.org/r/20170309104154.28295-6-jbrunet@baylibre.com
237 lines
6.5 KiB
C
237 lines
6.5 KiB
C
/*
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* This file is provided under a dual BSD/GPLv2 license. When using or
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* redistributing this file, you may do so under either license.
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*
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* GPL LICENSE SUMMARY
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*
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* Copyright (c) 2016 AmLogic, Inc.
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* Author: Michael Turquette <mturquette@baylibre.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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* The full GNU General Public License is included in this distribution
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* in the file called COPYING
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*
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* BSD LICENSE
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*
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* Copyright (c) 2016 AmLogic, Inc.
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* Author: Michael Turquette <mturquette@baylibre.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* MultiPhase Locked Loops are outputs from a PLL with additional frequency
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* scaling capabilities. MPLL rates are calculated as:
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*
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* f(N2_integer, SDM_IN ) = 2.0G/(N2_integer + SDM_IN/16384)
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*/
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#include <linux/clk-provider.h>
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#include "clkc.h"
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#define SDM_DEN 16384
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#define SDM_MIN 1
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#define SDM_MAX 16383
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#define N2_MIN 4
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#define N2_MAX 127
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#define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw)
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static unsigned long rate_from_params(unsigned long parent_rate,
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unsigned long sdm,
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unsigned long n2)
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{
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return (parent_rate * SDM_DEN) / ((SDM_DEN * n2) + sdm);
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}
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static void params_from_rate(unsigned long requested_rate,
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unsigned long parent_rate,
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unsigned long *sdm,
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unsigned long *n2)
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{
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uint64_t div = parent_rate;
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unsigned long rem = do_div(div, requested_rate);
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if (div < N2_MIN) {
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*n2 = N2_MIN;
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*sdm = SDM_MIN;
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} else if (div > N2_MAX) {
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*n2 = N2_MAX;
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*sdm = SDM_MAX;
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} else {
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*n2 = div;
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*sdm = DIV_ROUND_UP(rem * SDM_DEN, requested_rate);
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if (*sdm < SDM_MIN)
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*sdm = SDM_MIN;
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else if (*sdm > SDM_MAX)
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*sdm = SDM_MAX;
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}
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}
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static unsigned long mpll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
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struct parm *p;
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unsigned long reg, sdm, n2;
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p = &mpll->sdm;
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reg = readl(mpll->base + p->reg_off);
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sdm = PARM_GET(p->width, p->shift, reg);
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p = &mpll->n2;
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reg = readl(mpll->base + p->reg_off);
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n2 = PARM_GET(p->width, p->shift, reg);
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return rate_from_params(parent_rate, sdm, n2);
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}
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static long mpll_round_rate(struct clk_hw *hw,
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unsigned long rate,
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unsigned long *parent_rate)
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{
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unsigned long sdm, n2;
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params_from_rate(rate, *parent_rate, &sdm, &n2);
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return rate_from_params(*parent_rate, sdm, n2);
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}
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static int mpll_set_rate(struct clk_hw *hw,
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unsigned long rate,
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unsigned long parent_rate)
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{
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struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
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struct parm *p;
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unsigned long reg, sdm, n2;
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unsigned long flags = 0;
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params_from_rate(rate, parent_rate, &sdm, &n2);
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if (mpll->lock)
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spin_lock_irqsave(mpll->lock, flags);
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else
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__acquire(mpll->lock);
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p = &mpll->sdm;
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reg = readl(mpll->base + p->reg_off);
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reg = PARM_SET(p->width, p->shift, reg, sdm);
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writel(reg, mpll->base + p->reg_off);
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p = &mpll->sdm_en;
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reg = readl(mpll->base + p->reg_off);
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reg = PARM_SET(p->width, p->shift, reg, 1);
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writel(reg, mpll->base + p->reg_off);
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p = &mpll->n2;
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reg = readl(mpll->base + p->reg_off);
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reg = PARM_SET(p->width, p->shift, reg, n2);
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writel(reg, mpll->base + p->reg_off);
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if (mpll->lock)
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spin_unlock_irqrestore(mpll->lock, flags);
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else
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__release(mpll->lock);
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return 0;
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}
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static void mpll_enable_core(struct clk_hw *hw, int enable)
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{
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struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
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struct parm *p;
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unsigned long reg;
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unsigned long flags = 0;
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if (mpll->lock)
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spin_lock_irqsave(mpll->lock, flags);
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else
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__acquire(mpll->lock);
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p = &mpll->en;
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reg = readl(mpll->base + p->reg_off);
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reg = PARM_SET(p->width, p->shift, reg, enable ? 1 : 0);
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writel(reg, mpll->base + p->reg_off);
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if (mpll->lock)
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spin_unlock_irqrestore(mpll->lock, flags);
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else
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__release(mpll->lock);
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}
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static int mpll_enable(struct clk_hw *hw)
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{
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mpll_enable_core(hw, 1);
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return 0;
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}
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static void mpll_disable(struct clk_hw *hw)
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{
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mpll_enable_core(hw, 0);
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}
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static int mpll_is_enabled(struct clk_hw *hw)
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{
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struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw);
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struct parm *p;
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unsigned long reg;
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int en;
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p = &mpll->en;
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reg = readl(mpll->base + p->reg_off);
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en = PARM_GET(p->width, p->shift, reg);
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return en;
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}
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const struct clk_ops meson_clk_mpll_ro_ops = {
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.recalc_rate = mpll_recalc_rate,
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.round_rate = mpll_round_rate,
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.is_enabled = mpll_is_enabled,
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};
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const struct clk_ops meson_clk_mpll_ops = {
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.recalc_rate = mpll_recalc_rate,
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.round_rate = mpll_round_rate,
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.set_rate = mpll_set_rate,
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.enable = mpll_enable,
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.disable = mpll_disable,
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.is_enabled = mpll_is_enabled,
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};
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