From patchwork Tue Sep 14 15:56:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 12494109 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EB9DBC43217 for ; Tue, 14 Sep 2021 15:56:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D757B61260 for ; Tue, 14 Sep 2021 15:56:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233716AbhINP5c (ORCPT ); Tue, 14 Sep 2021 11:57:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234167AbhINP5b (ORCPT ); Tue, 14 Sep 2021 11:57:31 -0400 Received: from mail-lf1-x12b.google.com (mail-lf1-x12b.google.com [IPv6:2a00:1450:4864:20::12b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0A85AC0613CF for ; Tue, 14 Sep 2021 08:56:14 -0700 (PDT) Received: by mail-lf1-x12b.google.com with SMTP id a4so29862477lfg.8 for ; Tue, 14 Sep 2021 08:56:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=FsmxwsvLuhos/2hySe+N+Y45xPpsykMi53i/B9j4YZE=; b=Qw6pbbpiV0RVUyrBVEmiDjF5gVxmin9l5k6UbqxBixjZa4efOdsxAPHDCw+co0gtTN ePuVd644k9yOSXx+/ak+YVz+c2+zds0/mRdXexVB5h5z7CCoVNZkE+a7liD0SyS00MeK pq2qJPgc3s20I4de8szcxP9JMmtD0CkKdxcVVfZPe41Xt97F27UCs/ATKJMiVVawEDbw 2L7y09HUZgCd0GZDwD5fKa34A1lIUSjaQdKBRlY3TiQ2iOZANzzBvB6+jkWnp3DTwEjL yQ9lPRBJ6DFRbmcOgKESi/3AAf3H/5XG8mEzdNy7a3mXcNu1l/yRY7CPJJVzO6lgEnxj vgBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=FsmxwsvLuhos/2hySe+N+Y45xPpsykMi53i/B9j4YZE=; b=WtZxJb1S8Hknw0CrLNztH2gjHAzs9J60PoCMUwJrPUAnjA6ZNNuX5daLzSabPADrwG b4gU9qAbzOw1GPp9hwFZf8hlqoo/aA493aK4kDF3TnR2zn/COlUuntk+DYTmr9dsEjiT 3/BjJdkDsatU38OKRAHrdX1OKNGY+HoDoCxxYUslWdmDkmWx8nvql9NHwsT6znQfhzj2 04Io0La/XmMAqaBCRUn/6Gl1ElPhndeZzOmgABHfUM4pU4aO1dtk0lOPXKs0PzhHp7WO nvt8I0hX1DjamsuxMLyNGGBo6Tiv33IRFklxzQZCsNf9lJWP1exFaJlA48Ai2stnbvjH abhQ== X-Gm-Message-State: AOAM531VDknsev2zdQ5bryQcIgLYGqEXJSQn/J2nVoELn3CwBtiFqzB2 bD4lLCFDCP6Bn9C69rKS57ffmw== X-Google-Smtp-Source: ABdhPJzECS9jVyTfA2uQ+TtyTGqjZu4NhZcLuqEIUCXaujusPfXE6wMsuvH9yv9/e95OCFrgXFJWuQ== X-Received: by 2002:a05:6512:10cb:: with SMTP id k11mr13311805lfg.67.1631634972268; Tue, 14 Sep 2021 08:56:12 -0700 (PDT) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id w3sm851743lfu.147.2021.09.14.08.56.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Sep 2021 08:56:11 -0700 (PDT) From: Sam Protsenko To: Krzysztof Kozlowski , Sylwester Nawrocki , =?utf-8?q?Pawe=C5=82_Chmiel?= , Chanwoo Choi , Tomasz Figa , Rob Herring , Stephen Boyd , Michael Turquette Cc: Ryu Euiyoul , Tom Gall , Sumit Semwal , John Stultz , Amit Pundir , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH 2/6] clk: samsung: clk-pll: Implement pll0822x PLL type Date: Tue, 14 Sep 2021 18:56:03 +0300 Message-Id: <20210914155607.14122-3-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210914155607.14122-1-semen.protsenko@linaro.org> References: <20210914155607.14122-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org pll0822x PLL is used in Exynos850 SoC for top-level integer PLLs. The code was derived from very similar pll35xx type, with next differences: 1. Lock time for pll0822x is 150*P_DIV, when for pll35xx it's 270*P_DIV 2. It's not suggested in Exynos850 TRM that S_DIV change doesn't require performing PLL lock procedure (which is done in pll35xx implementation) When defining pll0822x type, CON3 register offset should be provided as a "con" parameter of PLL() macro, like this: PLL(pll_0822x, 0, "fout_shared0_pll", "oscclk", PLL_LOCKTIME_PLL_SHARED0, PLL_CON3_PLL_SHARED0, exynos850_shared0_pll_rates), To define PLL rates table, one can use PLL_35XX_RATE() macro, e.g.: PLL_35XX_RATE(26 * MHZ, 1600 * MHZ, 800, 13, 0) as it's completely appropriate for pl0822x type and there is no sense in duplicating that. If bit #1 (MANUAL_PLL_CTRL) is not set in CON1 register, it won't be possible to set new rate, with next error showing in kernel log: Could not lock PLL fout_shared1_pll That can happen for example if bootloader clears that bit beforehand. PLL driver doesn't account for that, so if MANUAL_PLL_CTRL bit was cleared, it's assumed it was done for a reason and it shouldn't be possible to change that PLL's rate at all. Signed-off-by: Sam Protsenko Reviewed-by: Krzysztof Kozlowski Acked-by: Chanwoo Choi --- drivers/clk/samsung/clk-pll.c | 91 +++++++++++++++++++++++++++++++++++ drivers/clk/samsung/clk-pll.h | 1 + 2 files changed, 92 insertions(+) diff --git a/drivers/clk/samsung/clk-pll.c b/drivers/clk/samsung/clk-pll.c index 5873a9354b50..03131b149c0b 100644 --- a/drivers/clk/samsung/clk-pll.c +++ b/drivers/clk/samsung/clk-pll.c @@ -415,6 +415,89 @@ static const struct clk_ops samsung_pll36xx_clk_min_ops = { .recalc_rate = samsung_pll36xx_recalc_rate, }; +/* + * PLL0822x Clock Type + */ +/* Maximum lock time can be 150 * PDIV cycles */ +#define PLL0822X_LOCK_FACTOR (150) + +#define PLL0822X_MDIV_MASK (0x3FF) +#define PLL0822X_PDIV_MASK (0x3F) +#define PLL0822X_SDIV_MASK (0x7) +#define PLL0822X_MDIV_SHIFT (16) +#define PLL0822X_PDIV_SHIFT (8) +#define PLL0822X_SDIV_SHIFT (0) +#define PLL0822X_LOCK_STAT_SHIFT (29) +#define PLL0822X_ENABLE_SHIFT (31) + +static unsigned long samsung_pll0822x_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct samsung_clk_pll *pll = to_clk_pll(hw); + u32 mdiv, pdiv, sdiv, pll_con3; + u64 fvco = parent_rate; + + pll_con3 = readl_relaxed(pll->con_reg); + mdiv = (pll_con3 >> PLL0822X_MDIV_SHIFT) & PLL0822X_MDIV_MASK; + pdiv = (pll_con3 >> PLL0822X_PDIV_SHIFT) & PLL0822X_PDIV_MASK; + sdiv = (pll_con3 >> PLL0822X_SDIV_SHIFT) & PLL0822X_SDIV_MASK; + + fvco *= mdiv; + do_div(fvco, (pdiv << sdiv)); + + return (unsigned long)fvco; +} + +static int samsung_pll0822x_set_rate(struct clk_hw *hw, unsigned long drate, + unsigned long prate) +{ + const struct samsung_pll_rate_table *rate; + struct samsung_clk_pll *pll = to_clk_pll(hw); + u32 pll_con3; + + /* Get required rate settings from table */ + rate = samsung_get_pll_settings(pll, drate); + if (!rate) { + pr_err("%s: Invalid rate : %lu for pll clk %s\n", __func__, + drate, clk_hw_get_name(hw)); + return -EINVAL; + } + + /* Change PLL PMS values */ + pll_con3 = readl_relaxed(pll->con_reg); + pll_con3 &= ~((PLL0822X_MDIV_MASK << PLL0822X_MDIV_SHIFT) | + (PLL0822X_PDIV_MASK << PLL0822X_PDIV_SHIFT) | + (PLL0822X_SDIV_MASK << PLL0822X_SDIV_SHIFT)); + pll_con3 |= (rate->mdiv << PLL0822X_MDIV_SHIFT) | + (rate->pdiv << PLL0822X_PDIV_SHIFT) | + (rate->sdiv << PLL0822X_SDIV_SHIFT); + + /* Set PLL lock time */ + writel_relaxed(rate->pdiv * PLL0822X_LOCK_FACTOR, + pll->lock_reg); + + /* Write PMS values */ + writel_relaxed(pll_con3, pll->con_reg); + + /* Wait for PLL lock if the PLL is enabled */ + if (pll_con3 & BIT(pll->enable_offs)) + return samsung_pll_lock_wait(pll, BIT(pll->lock_offs)); + + return 0; +} + +static const struct clk_ops samsung_pll0822x_clk_ops = { + .recalc_rate = samsung_pll0822x_recalc_rate, + .round_rate = samsung_pll_round_rate, + .set_rate = samsung_pll0822x_set_rate, + .enable = samsung_pll3xxx_enable, + .disable = samsung_pll3xxx_disable, +}; + +static const struct clk_ops samsung_pll0822x_clk_min_ops = { + .recalc_rate = samsung_pll0822x_recalc_rate, +}; + /* * PLL45xx Clock Type */ @@ -1296,6 +1379,14 @@ static void __init _samsung_clk_register_pll(struct samsung_clk_provider *ctx, else init.ops = &samsung_pll35xx_clk_ops; break; + case pll_0822x: + pll->enable_offs = PLL0822X_ENABLE_SHIFT; + pll->lock_offs = PLL0822X_LOCK_STAT_SHIFT; + if (!pll->rate_table) + init.ops = &samsung_pll0822x_clk_min_ops; + else + init.ops = &samsung_pll0822x_clk_ops; + break; case pll_4500: init.ops = &samsung_pll45xx_clk_min_ops; break; diff --git a/drivers/clk/samsung/clk-pll.h b/drivers/clk/samsung/clk-pll.h index 79e41c226b90..213e94a97f23 100644 --- a/drivers/clk/samsung/clk-pll.h +++ b/drivers/clk/samsung/clk-pll.h @@ -36,6 +36,7 @@ enum samsung_pll_type { pll_1451x, pll_1452x, pll_1460x, + pll_0822x, }; #define PLL_RATE(_fin, _m, _p, _s, _k, _ks) \