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[172.248.200.249]) by smtp.gmail.com with ESMTPSA id 17sm12718711pfa.59.2016.06.09.17.32.57 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 09 Jun 2016 17:32:58 -0700 (PDT) From: Michael Turquette To: linux-clk@vger.kernel.org Subject: [PATCH 2/7] clk: meson: add mpll support Date: Thu, 9 Jun 2016 17:32:49 -0700 Message-Id: <1465518774-26924-3-git-send-email-mturquette@baylibre.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1465518774-26924-1-git-send-email-mturquette@baylibre.com> References: <1465518774-26924-1-git-send-email-mturquette@baylibre.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160609_173319_156208_B5CD0FD5 X-CRM114-Status: GOOD ( 17.41 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: xing.xu@amlogic.com, victor.wan@amlogic.com, khilman@baylibre.com, carlo@endlessm.com, jerry.cao@amlogic.com, linux-amlogic@lists.infradead.org MIME-Version: 1.0 Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+patchwork-linux-amlogic=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP MPLLs are adjustable rate clocks derived from PLLs. On both Meson8b and GXBB they appear to be only derived from fixed_pll. Add support for these clock types so that they can be added to their respective drivers. Signed-off-by: Michael Turquette --- drivers/clk/meson/Makefile | 2 +- drivers/clk/meson/clk-mpll.c | 94 ++++++++++++++++++++++++++++++++++++++++++++ drivers/clk/meson/clkc.h | 10 +++++ 3 files changed, 105 insertions(+), 1 deletion(-) create mode 100644 drivers/clk/meson/clk-mpll.c diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index b3d60fe..7667218 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -2,5 +2,5 @@ # Makefile for Meson specific clk # -obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-cpu.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-cpu.o clk-mpll.o obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b-clkc.o diff --git a/drivers/clk/meson/clk-mpll.c b/drivers/clk/meson/clk-mpll.c new file mode 100644 index 0000000..03af790 --- /dev/null +++ b/drivers/clk/meson/clk-mpll.c @@ -0,0 +1,94 @@ +/* + * 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_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, +}; diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h index 9436932..73f0146 100644 --- a/drivers/clk/meson/clkc.h +++ b/drivers/clk/meson/clkc.h @@ -73,6 +73,15 @@ struct meson_clk_cpu { int meson_clk_cpu_notifier_cb(struct notifier_block *nb, unsigned long event, void *data); +struct meson_clk_mpll { + struct clk_hw hw; + void __iomem *base; + struct parm sdm; + struct parm n2; + /* FIXME ssen gate control? */ + spinlock_t *lock; +}; + #define MESON_GATE(_name, _reg, _bit) \ struct clk_gate gxbb_##_name = { \ .reg = (void __iomem *) _reg, \ @@ -91,5 +100,6 @@ struct clk_gate gxbb_##_name = { \ extern const struct clk_ops meson_clk_pll_ro_ops; extern const struct clk_ops meson_clk_pll_ops; extern const struct clk_ops meson_clk_cpu_ops; +extern const struct clk_ops meson_clk_mpll_ro_ops; #endif /* __CLKC_H */