/* * 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 * * 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 * * 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 #include "clkc.h" #define SDM_DEN 16384 #define N2_MIN 4 #define N2_MAX 511 #define to_meson_clk_mpll(_hw) container_of(_hw, struct meson_clk_mpll, hw) static long rate_from_params(unsigned long parent_rate, unsigned long sdm, unsigned long n2) { unsigned long divisor = (SDM_DEN * n2) + sdm; if (n2 < N2_MIN) return -EINVAL; return (parent_rate * SDM_DEN) / divisor; } static void params_from_rate(unsigned long requested_rate, unsigned long parent_rate, unsigned long *sdm, unsigned long *n2) { uint64_t div = parent_rate; unsigned long rem = do_div(div, requested_rate); if (div < N2_MIN) { *n2 = N2_MIN; *sdm = 0; } else if (div > N2_MAX) { *n2 = N2_MAX; *sdm = SDM_DEN - 1; } else { *n2 = div; *sdm = DIV_ROUND_UP(rem * SDM_DEN, requested_rate); } } 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 reg, sdm, n2; long rate; 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 = rate_from_params(parent_rate, sdm, n2); if (rate < 0) return 0; return rate; } static long mpll_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *parent_rate) { unsigned long sdm, n2; params_from_rate(rate, *parent_rate, &sdm, &n2); return rate_from_params(*parent_rate, sdm, n2); } static int mpll_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw); struct parm *p; unsigned long reg, sdm, n2; unsigned long flags = 0; params_from_rate(rate, parent_rate, &sdm, &n2); if (mpll->lock) spin_lock_irqsave(mpll->lock, flags); else __acquire(mpll->lock); p = &mpll->sdm; reg = readl(mpll->base + p->reg_off); reg = PARM_SET(p->width, p->shift, reg, sdm); writel(reg, mpll->base + p->reg_off); p = &mpll->sdm_en; reg = readl(mpll->base + p->reg_off); reg = PARM_SET(p->width, p->shift, reg, 1); writel(reg, mpll->base + p->reg_off); p = &mpll->n2; reg = readl(mpll->base + p->reg_off); reg = PARM_SET(p->width, p->shift, reg, n2); writel(reg, mpll->base + p->reg_off); if (mpll->lock) spin_unlock_irqrestore(mpll->lock, flags); else __release(mpll->lock); return 0; } static void mpll_enable_core(struct clk_hw *hw, int enable) { struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw); struct parm *p; unsigned long reg; unsigned long flags = 0; if (mpll->lock) spin_lock_irqsave(mpll->lock, flags); else __acquire(mpll->lock); p = &mpll->en; reg = readl(mpll->base + p->reg_off); reg = PARM_SET(p->width, p->shift, reg, enable ? 1 : 0); writel(reg, mpll->base + p->reg_off); if (mpll->lock) spin_unlock_irqrestore(mpll->lock, flags); else __release(mpll->lock); } static int mpll_enable(struct clk_hw *hw) { mpll_enable_core(hw, 1); return 0; } static void mpll_disable(struct clk_hw *hw) { mpll_enable_core(hw, 0); } static int mpll_is_enabled(struct clk_hw *hw) { struct meson_clk_mpll *mpll = to_meson_clk_mpll(hw); struct parm *p; unsigned long reg; int en; p = &mpll->en; reg = readl(mpll->base + p->reg_off); en = PARM_GET(p->width, p->shift, reg); return en; } const struct clk_ops meson_clk_mpll_ro_ops = { .recalc_rate = mpll_recalc_rate, .round_rate = mpll_round_rate, .is_enabled = mpll_is_enabled, }; const struct clk_ops meson_clk_mpll_ops = { .recalc_rate = mpll_recalc_rate, .round_rate = mpll_round_rate, .set_rate = mpll_set_rate, .enable = mpll_enable, .disable = mpll_disable, .is_enabled = mpll_is_enabled, };