From patchwork Wed Dec 19 11:40:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jianxin Pan X-Patchwork-Id: 10737081 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D3C0A13BF for ; Wed, 19 Dec 2018 11:43:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C1D122AE17 for ; Wed, 19 Dec 2018 11:43:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B4CFB2AFA3; Wed, 19 Dec 2018 11:43:19 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3B9722AE17 for ; 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Wed, 19 Dec 2018 11:43:14 +0000 Received: from mail-sh2.amlogic.com ([58.32.228.45]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gZaFp-0006Bd-49; Wed, 19 Dec 2018 11:43:10 +0000 Received: from localhost.localdomain (10.18.11.217) by mail-sh2.amlogic.com (10.18.11.6) with Microsoft SMTP Server id 15.0.1320.4; Wed, 19 Dec 2018 19:41:18 +0800 From: Jianxin Pan To: Jerome Brunet , Neil Armstrong Subject: [PATCH RESEND v8 1/4] clk: meson: add one based divider support for sclk divider Date: Wed, 19 Dec 2018 19:40:39 +0800 Message-ID: <1545219642-9834-2-git-send-email-jianxin.pan@amlogic.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1545219642-9834-1-git-send-email-jianxin.pan@amlogic.com> References: <1545219642-9834-1-git-send-email-jianxin.pan@amlogic.com> MIME-Version: 1.0 X-Originating-IP: [10.18.11.217] X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181219_034309_350986_B4ABD87C X-CRM114-Status: GOOD ( 16.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rob Herring , Hanjie Lin , Victor Wan , Jianxin Pan , devicetree@vger.kernel.org, Stephen Boyd , Kevin Hilman , Michael Turquette , Yixun Lan , linux-kernel@vger.kernel.org, Boris Brezillon , Liang Yang , Jian Hu , Miquel Raynal , Carlo Caione , linux-amlogic@lists.infradead.org, Martin Blumenstingl , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Qiufang Dai Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP When CLK_DIVIDER_ONE_BASED flag is set, the sclk divider will be: one based divider (div = val), and zero value gates the clock Signed-off-by: Jianxin Pan --- drivers/clk/meson/Makefile | 3 ++- drivers/clk/meson/clkc-audio.h | 8 ------ drivers/clk/meson/clkc.h | 10 ++++++- drivers/clk/meson/sclk-div.c | 59 ++++++++++++++++++++++++++++-------------- 4 files changed, 50 insertions(+), 30 deletions(-) diff --git a/drivers/clk/meson/Makefile b/drivers/clk/meson/Makefile index a849aa8..acd8694 100644 --- a/drivers/clk/meson/Makefile +++ b/drivers/clk/meson/Makefile @@ -4,7 +4,8 @@ obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-mpll.o clk-phase.o vid-pll-div.o obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-input.o -obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o sclk-div.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC) += sclk-div.o +obj-$(CONFIG_COMMON_CLK_AMLOGIC_AUDIO) += clk-triphase.o obj-$(CONFIG_COMMON_CLK_MESON_AO) += meson-aoclk.o obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b.o obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o gxbb-aoclk-32k.o diff --git a/drivers/clk/meson/clkc-audio.h b/drivers/clk/meson/clkc-audio.h index 0a7c157..286ff12 100644 --- a/drivers/clk/meson/clkc-audio.h +++ b/drivers/clk/meson/clkc-audio.h @@ -15,14 +15,6 @@ struct meson_clk_triphase_data { struct parm ph2; }; -struct meson_sclk_div_data { - struct parm div; - struct parm hi; - unsigned int cached_div; - struct clk_duty cached_duty; -}; - extern const struct clk_ops meson_clk_triphase_ops; -extern const struct clk_ops meson_sclk_div_ops; #endif /* __MESON_CLKC_AUDIO_H */ diff --git a/drivers/clk/meson/clkc.h b/drivers/clk/meson/clkc.h index 6183b22..00b3320 100644 --- a/drivers/clk/meson/clkc.h +++ b/drivers/clk/meson/clkc.h @@ -27,6 +27,14 @@ struct parm { u8 width; }; +struct meson_sclk_div_data { + struct parm div; + struct parm hi; + unsigned int cached_div; + struct clk_duty cached_duty; + u8 flags; +}; + static inline unsigned int meson_parm_read(struct regmap *map, struct parm *p) { unsigned int val; @@ -118,10 +126,10 @@ struct clk_regmap _name = { \ extern const struct clk_ops meson_clk_mpll_ops; extern const struct clk_ops meson_clk_phase_ops; extern const struct clk_ops meson_vid_pll_div_ro_ops; +extern const struct clk_ops meson_sclk_div_ops; struct clk_hw *meson_clk_hw_register_input(struct device *dev, const char *of_name, const char *clk_name, unsigned long flags); - #endif /* __CLKC_H */ diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c index bc64019..a6c425b 100644 --- a/drivers/clk/meson/sclk-div.c +++ b/drivers/clk/meson/sclk-div.c @@ -4,42 +4,60 @@ * Author: Jerome Brunet * * Sample clock generator divider: - * This HW divider gates with value 0 but is otherwise a zero based divider: + * This HW divider gates with value 0 * * val >= 1 - * divider = val + 1 + * divider = val + 1 if ONE_BASED is not set, otherwise divider = val. * * The duty cycle may also be set for the LR clock variant. The duty cycle * ratio is: * * hi = [0 - val] - * duty_cycle = (1 + hi) / (1 + val) + * duty_cycle = (1 + hi) / (1 + val) if ONE_BASED is not set, otherwise: + * duty_cycle = hi / (1 + val) */ -#include "clkc-audio.h" +#include "clkc.h" -static inline struct meson_sclk_div_data * -meson_sclk_div_data(struct clk_regmap *clk) +static inline int get_reg(int val, unsigned char flag) { - return (struct meson_sclk_div_data *)clk->data; + WARN_ON(val < 1); + if ((flag & CLK_DIVIDER_ONE_BASED) || !val) + return val; + else + return val - 1; +} + +static inline int get_value(int reg, unsigned char flag) +{ + if (flag & CLK_DIVIDER_ONE_BASED) + return reg; + else + return reg + 1; } -static int sclk_div_maxval(struct meson_sclk_div_data *sclk) +static inline struct meson_sclk_div_data * +meson_sclk_div_data(struct clk_regmap *clk) { - return (1 << sclk->div.width) - 1; + return (struct meson_sclk_div_data *)clk->data; } static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk) { - return sclk_div_maxval(sclk) + 1; + unsigned int reg = clk_div_mask(sclk->div.width); + + return get_value(reg, sclk->flags); } static int sclk_div_getdiv(struct clk_hw *hw, unsigned long rate, unsigned long prate, int maxdiv) { int div = DIV_ROUND_CLOSEST_ULL((u64)prate, rate); + struct clk_regmap *clk = to_clk_regmap(hw); + struct meson_sclk_div_data *sclk = meson_sclk_div_data(clk); + int mindiv = get_value(1, sclk->flags); - return clamp(div, 2, maxdiv); + return clamp(div, mindiv, maxdiv); } static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, @@ -47,7 +65,7 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, struct meson_sclk_div_data *sclk) { struct clk_hw *parent = clk_hw_get_parent(hw); - int bestdiv = 0, i; + int bestdiv = 0, i, mindiv; unsigned long maxdiv, now, parent_now; unsigned long best = 0, best_parent = 0; @@ -64,8 +82,9 @@ static int sclk_div_bestdiv(struct clk_hw *hw, unsigned long rate, * unsigned long in rate * i below */ maxdiv = min(ULONG_MAX / rate, maxdiv); + mindiv = get_value(1, sclk->flags); - for (i = 2; i <= maxdiv; i++) { + for (i = mindiv; i <= maxdiv; i++) { /* * It's the most ideal case if the requested rate can be * divided from parent clock without needing to change @@ -111,10 +130,7 @@ static void sclk_apply_ratio(struct clk_regmap *clk, sclk->cached_duty.num, sclk->cached_duty.den); - if (hi) - hi -= 1; - - meson_parm_write(clk->map, &sclk->hi, hi); + meson_parm_write(clk->map, &sclk->hi, get_reg(hi, sclk->flags)); } static int sclk_div_set_duty_cycle(struct clk_hw *hw, @@ -145,7 +161,7 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, } hi = meson_parm_read(clk->map, &sclk->hi); - duty->num = hi + 1; + duty->num = get_value(hi, sclk->flags); duty->den = sclk->cached_div; return 0; } @@ -153,10 +169,13 @@ static int sclk_div_get_duty_cycle(struct clk_hw *hw, static void sclk_apply_divider(struct clk_regmap *clk, struct meson_sclk_div_data *sclk) { + unsigned int div; + if (MESON_PARM_APPLICABLE(&sclk->hi)) sclk_apply_ratio(clk, sclk); - meson_parm_write(clk->map, &sclk->div, sclk->cached_div - 1); + div = get_reg(sclk->cached_div, sclk->flags); + meson_parm_write(clk->map, &sclk->div, div); } static int sclk_div_set_rate(struct clk_hw *hw, unsigned long rate, @@ -224,7 +243,7 @@ static void sclk_div_init(struct clk_hw *hw) if (!val) sclk->cached_div = sclk_div_maxdiv(sclk); else - sclk->cached_div = val + 1; + sclk->cached_div = get_value(val, sclk->flags); sclk_div_get_duty_cycle(hw, &sclk->cached_duty); }