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[209.132.180.67]) by mx.google.com with ESMTP id o32-v6si898878pld.440.2018.07.03.04.37.15; Tue, 03 Jul 2018 04:37:29 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=nvidia.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752606AbeGCLfk (ORCPT + 99 others); Tue, 3 Jul 2018 07:35:40 -0400 Received: from hqemgate15.nvidia.com ([216.228.121.64]:13024 "EHLO hqemgate15.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752401AbeGCLfi (ORCPT ); Tue, 3 Jul 2018 07:35:38 -0400 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate15.nvidia.com (using TLS: TLSv1, AES128-SHA) id ; Tue, 03 Jul 2018 04:35:01 -0700 Received: from HQMAIL101.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Tue, 03 Jul 2018 04:35:36 -0700 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Tue, 03 Jul 2018 04:35:36 -0700 Received: from dhcp-10-21-25-168.Nvidia.com (10.21.25.201) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Tue, 3 Jul 2018 11:35:34 +0000 From: Aapo Vienamo To: Peter De Schrijver CC: Prashant Gaikwad , Michael Turquette , Stephen Boyd , Thierry Reding , Jonathan Hunter , , , , Aapo Vienamo Subject: [PATCH 1/3] clk: tegra: refactor 7.1 div calculation Date: Tue, 3 Jul 2018 14:35:19 +0300 Message-ID: <1530617721-5767-1-git-send-email-avienamo@nvidia.com> X-Mailer: git-send-email 2.7.4 X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.21.25.201] X-ClientProxiedBy: UKMAIL101.nvidia.com (10.26.138.13) To HQMAIL101.nvidia.com (172.20.187.10) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peter De Schrijver Move this to a separate file so it can be used to calculate the sdmmc clock dividers. Signed-off-by: Peter De-Schrijver Signed-off-by: Aapo Vienamo --- drivers/clk/tegra/Makefile | 1 + drivers/clk/tegra/clk-divider.c | 30 ++++-------------------- drivers/clk/tegra/clk.h | 3 +++ drivers/clk/tegra/div71.c | 51 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 60 insertions(+), 25 deletions(-) create mode 100644 drivers/clk/tegra/div71.c diff --git a/drivers/clk/tegra/Makefile b/drivers/clk/tegra/Makefile index b716923..6d4f563 100644 --- a/drivers/clk/tegra/Makefile +++ b/drivers/clk/tegra/Makefile @@ -24,3 +24,4 @@ obj-$(CONFIG_ARCH_TEGRA_132_SOC) += clk-tegra124.o obj-y += cvb.o obj-$(CONFIG_ARCH_TEGRA_210_SOC) += clk-tegra210.o obj-$(CONFIG_CLK_TEGRA_BPMP) += clk-bpmp.o +obj-y += div71.o diff --git a/drivers/clk/tegra/clk-divider.c b/drivers/clk/tegra/clk-divider.c index 16e0aee..ad87858 100644 --- a/drivers/clk/tegra/clk-divider.c +++ b/drivers/clk/tegra/clk-divider.c @@ -32,35 +32,15 @@ static int get_div(struct tegra_clk_frac_div *divider, unsigned long rate, unsigned long parent_rate) { - u64 divider_ux1 = parent_rate; - u8 flags = divider->flags; - int mul; - - if (!rate) - return 0; - - mul = get_mul(divider); - - if (!(flags & TEGRA_DIVIDER_INT)) - divider_ux1 *= mul; - - if (flags & TEGRA_DIVIDER_ROUND_UP) - divider_ux1 += rate - 1; - - do_div(divider_ux1, rate); - - if (flags & TEGRA_DIVIDER_INT) - divider_ux1 *= mul; + int div; - divider_ux1 -= mul; + div = div71_get(rate, parent_rate, divider->width, divider->frac_width, + divider->flags); - if ((s64)divider_ux1 < 0) + if (div < 0) return 0; - if (divider_ux1 > get_max_div(divider)) - return get_max_div(divider); - - return divider_ux1; + return div; } static unsigned long clk_frac_div_recalc_rate(struct clk_hw *hw, diff --git a/drivers/clk/tegra/clk.h b/drivers/clk/tegra/clk.h index e1f8846..f14e136 100644 --- a/drivers/clk/tegra/clk.h +++ b/drivers/clk/tegra/clk.h @@ -811,6 +811,9 @@ extern tegra_clk_apply_init_table_func tegra_clk_apply_init_table; int tegra_pll_wait_for_lock(struct tegra_clk_pll *pll); u16 tegra_pll_get_fixed_mdiv(struct clk_hw *hw, unsigned long input_rate); int tegra_pll_p_div_to_hw(struct tegra_clk_pll *pll, u8 p_div); +int div71_get(unsigned long rate, unsigned parent_rate, u8 width, + u8 frac_width, u8 flags); + /* Combined read fence with delay */ #define fence_udelay(delay, reg) \ diff --git a/drivers/clk/tegra/div71.c b/drivers/clk/tegra/div71.c new file mode 100644 index 0000000..27b3846 --- /dev/null +++ b/drivers/clk/tegra/div71.c @@ -0,0 +1,51 @@ +/* + * Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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, see . + */ + +#include + +#include "clk.h" + +#define div_mask(w) ((1 << (w)) - 1) + +int div71_get(unsigned long rate, unsigned parent_rate, u8 width, + u8 frac_width, u8 flags) +{ + s64 divider_ux1 = parent_rate; + int mul; + + if (!rate) + return 0; + + mul = 1 << frac_width; + + if (!(flags & TEGRA_DIVIDER_INT)) + divider_ux1 *= mul; + + if (flags & TEGRA_DIVIDER_ROUND_UP) + divider_ux1 += rate - 1; + + do_div(divider_ux1, rate); + + if (flags & TEGRA_DIVIDER_INT) + divider_ux1 *= mul; + + divider_ux1 -= mul; + + if (divider_ux1 > div_mask(width)) + return div_mask(width); + + return divider_ux1; +} -- 2.7.4