From patchwork Mon Nov 11 00:47:17 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andre Przywara X-Patchwork-Id: 13870085 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 90D91EAF9; Mon, 11 Nov 2024 00:47:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731286059; cv=none; b=iKRqwRMwLCjBPJJ6LA3Y3PLWep8iK/UUkqjHvODQd/2gQ3sL1goKQf0Huc2xBUKfjeUrMHqcY0+u0sHzOIz1k+WAwgFilhEIstAfEBdVYg14TZEO3mXA1zrQPrFfJ14HcyC7UQ0txkaFGyMpUPetqQ4tzbdHxMZtREY0G8zbyQI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731286059; c=relaxed/simple; bh=dPTZs1X6MbudQQjJSUcFCojh1plgmdGcZJfd6cqjdTE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uCqzmCZLcJsLWE6rFKbL803oYDH5JzMwRcrBAn+Odr+pdHg3cgUUsDaPD8vL3xhLKysXDCjL3H55ur4v3BcnbS75HOGSlk2rKaIYwBSkTGu5Pb1ymfw6u3xhA855MJVqwf+mbk9DwZF9NU+9TRVK0XwclCuI02eW5umWdxq0lBk= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id DE1321CDD; Sun, 10 Nov 2024 16:48:06 -0800 (PST) Received: from localhost.localdomain (usa-sjc-mx-foss1.foss.arm.com [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 00ECF3F66E; Sun, 10 Nov 2024 16:47:34 -0800 (PST) From: Andre Przywara To: Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: Philipp Zabel , Icenowy Zheng , linux-clk@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH 2/7] clk: sunxi-ng: mp: introduce dual-divider clock Date: Mon, 11 Nov 2024 00:47:17 +0000 Message-ID: <20241111004722.10130-3-andre.przywara@arm.com> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20241111004722.10130-1-andre.przywara@arm.com> References: <20241111004722.10130-1-andre.przywara@arm.com> Precedence: bulk X-Mailing-List: linux-clk@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The Allwinner A523 SoC introduces some new MP-style mod clock, where the second "P" divider is an actual numerical divider value, and not the numbers of bits to shift (1..32 instead of 1,2,4,8). The rest of the clock is the same as the existing MP clock, so enhance the existing code to accommodate for this. Introduce the new CCU feature bit CCU_FEATURE_DUAL_DIV to mark an MP clock as having two dividers, and change the dividing and encoding code to differentiate the two cases. Signed-off-by: Andre Przywara --- drivers/clk/sunxi-ng/ccu_common.h | 1 + drivers/clk/sunxi-ng/ccu_mp.c | 51 +++++++++++++++++++++++++------ 2 files changed, 42 insertions(+), 10 deletions(-) diff --git a/drivers/clk/sunxi-ng/ccu_common.h b/drivers/clk/sunxi-ng/ccu_common.h index 329734f8cf42b..4bb05207bb5df 100644 --- a/drivers/clk/sunxi-ng/ccu_common.h +++ b/drivers/clk/sunxi-ng/ccu_common.h @@ -19,6 +19,7 @@ #define CCU_FEATURE_SIGMA_DELTA_MOD BIT(7) #define CCU_FEATURE_KEY_FIELD BIT(8) #define CCU_FEATURE_CLOSEST_RATE BIT(9) +#define CCU_FEATURE_DUAL_DIV BIT(10) /* MMC timing mode switch bit */ #define CCU_MMC_NEW_TIMING_MODE BIT(30) diff --git a/drivers/clk/sunxi-ng/ccu_mp.c b/drivers/clk/sunxi-ng/ccu_mp.c index cc94a694cb676..1be4668abef7c 100644 --- a/drivers/clk/sunxi-ng/ccu_mp.c +++ b/drivers/clk/sunxi-ng/ccu_mp.c @@ -10,15 +10,23 @@ #include "ccu_gate.h" #include "ccu_mp.h" +static unsigned int next_div(unsigned int div, bool shift) +{ + if (shift) + return div << 1; + return div + 1; +} + static unsigned long ccu_mp_find_best(unsigned long parent, unsigned long rate, unsigned int max_m, unsigned int max_p, + bool shift, unsigned int *m, unsigned int *p) { unsigned long best_rate = 0; unsigned int best_m = 0, best_p = 0; unsigned int _m, _p; - for (_p = 1; _p <= max_p; _p <<= 1) { + for (_p = 1; _p <= max_p; _p = next_div(_p, shift)) { for (_m = 1; _m <= max_m; _m++) { unsigned long tmp_rate = parent / _p / _m; @@ -43,7 +51,8 @@ static unsigned long ccu_mp_find_best_with_parent_adj(struct clk_hw *hw, unsigned long *parent, unsigned long rate, unsigned int max_m, - unsigned int max_p) + unsigned int max_p, + bool shift) { unsigned long parent_rate_saved; unsigned long parent_rate, now; @@ -60,7 +69,7 @@ static unsigned long ccu_mp_find_best_with_parent_adj(struct clk_hw *hw, maxdiv = max_m * max_p; maxdiv = min(ULONG_MAX / rate, maxdiv); - for (_p = 1; _p <= max_p; _p <<= 1) { + for (_p = 1; _p <= max_p; _p = next_div(_p, shift)) { for (_m = 1; _m <= max_m; _m++) { div = _m * _p; @@ -103,18 +112,26 @@ static unsigned long ccu_mp_round_rate(struct ccu_mux_internal *mux, struct ccu_mp *cmp = data; unsigned int max_m, max_p; unsigned int m, p; + bool shift = true; if (cmp->common.features & CCU_FEATURE_FIXED_POSTDIV) rate *= cmp->fixed_post_div; + if (cmp->common.features & CCU_FEATURE_DUAL_DIV) + shift = false; + max_m = cmp->m.max ?: 1 << cmp->m.width; - max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1); + if (shift) + max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1); + else + max_p = cmp->p.max ?: 1 << cmp->p.width; if (!clk_hw_can_set_rate_parent(&cmp->common.hw)) { - rate = ccu_mp_find_best(*parent_rate, rate, max_m, max_p, &m, &p); + rate = ccu_mp_find_best(*parent_rate, rate, max_m, max_p, shift, + &m, &p); } else { rate = ccu_mp_find_best_with_parent_adj(hw, parent_rate, rate, - max_m, max_p); + max_m, max_p, shift); } if (cmp->common.features & CCU_FEATURE_FIXED_POSTDIV) @@ -167,7 +184,11 @@ static unsigned long ccu_mp_recalc_rate(struct clk_hw *hw, p = reg >> cmp->p.shift; p &= (1 << cmp->p.width) - 1; - rate = (parent_rate >> p) / m; + if (cmp->common.features & CCU_FEATURE_DUAL_DIV) + rate = (parent_rate / p) / m; + else + rate = (parent_rate >> p) / m; + if (cmp->common.features & CCU_FEATURE_FIXED_POSTDIV) rate /= cmp->fixed_post_div; @@ -190,20 +211,27 @@ static int ccu_mp_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long flags; unsigned int max_m, max_p; unsigned int m, p; + bool shift = true; u32 reg; + if (cmp->common.features & CCU_FEATURE_DUAL_DIV) + shift = false; + /* Adjust parent_rate according to pre-dividers */ parent_rate = ccu_mux_helper_apply_prediv(&cmp->common, &cmp->mux, -1, parent_rate); max_m = cmp->m.max ?: 1 << cmp->m.width; - max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1); + if (shift) + max_p = cmp->p.max ?: 1 << ((1 << cmp->p.width) - 1); + else + max_p = cmp->p.max ?: 1 << cmp->p.width; /* Adjust target rate according to post-dividers */ if (cmp->common.features & CCU_FEATURE_FIXED_POSTDIV) rate = rate * cmp->fixed_post_div; - ccu_mp_find_best(parent_rate, rate, max_m, max_p, &m, &p); + ccu_mp_find_best(parent_rate, rate, max_m, max_p, shift, &m, &p); spin_lock_irqsave(cmp->common.lock, flags); @@ -211,7 +239,10 @@ static int ccu_mp_set_rate(struct clk_hw *hw, unsigned long rate, reg &= ~GENMASK(cmp->m.width + cmp->m.shift - 1, cmp->m.shift); reg &= ~GENMASK(cmp->p.width + cmp->p.shift - 1, cmp->p.shift); reg |= (m - cmp->m.offset) << cmp->m.shift; - reg |= ilog2(p) << cmp->p.shift; + if (shift) + reg |= ilog2(p) << cmp->p.shift; + else + reg |= (p - cmp->p.offset) << cmp->p.shift; writel(reg, cmp->common.base + cmp->common.reg);