From nobody Tue Feb 10 12:58:41 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=fail (Bad Signature); dmarc=fail(p=none dis=none) header.from=lmichel.fr Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1601029369958730.1921584987175; Fri, 25 Sep 2020 03:22:49 -0700 (PDT) Received: from localhost ([::1]:57962 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kLksK-0007Z8-Mu for importer@patchew.org; Fri, 25 Sep 2020 06:22:48 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42730) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLknK-00019X-VO; Fri, 25 Sep 2020 06:17:38 -0400 Received: from pharaoh.lmichel.fr ([149.202.28.74]:58240) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kLknJ-0007SE-7j; Fri, 25 Sep 2020 06:17:38 -0400 Received: from sekoia-pc.bar.greensocs.com (sekoia-pc.home.lmichel.fr [192.168.61.100]) by pharaoh.lmichel.fr (Postfix) with ESMTPS id AAAA6C60F22; Fri, 25 Sep 2020 10:17:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=lmichel.fr; s=pharaoh; t=1601029040; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YOuCNbOOvSsStZNfbQT6hnxWhxzA58znlB/MmjZ2y5Y=; b=G2msWksehXz8+B/Ovvn/E5LRViL4pvyLW1sALYAcTxj/PZimXJtVomTYV9Soz80kz0jWpl 99USxdF3nWyh7ZQbcdPxoP0X6sPmeNkiDtJBAt2Iygu17s62FX2v7wMxk0TIJEhPc41y/e hhTG7Rhr5hI1f683WUkbsLJoYChY87cpEcAtM/xn5kR3rtJM/FYSmBVSwNCKoRszooNlBH 7mFE+lUzE4sRlAIvS0HGD6NOd+fkjASL3r48PXvcU4jhaRSu1Gt48zkzuW0FjopmBN4Gtn qd/rw6q2AWoOWVlVAdo38mcs4Xkw8LeU3eDLDJuqnFvlJcbNqnXGlzldoR0Luw== From: Luc Michel To: qemu-devel@nongnu.org Subject: [PATCH 10/14] hw/misc/bcm2835_cprman: implement clock mux behaviour Date: Fri, 25 Sep 2020 12:17:27 +0200 Message-Id: <20200925101731.2159827-11-luc@lmichel.fr> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200925101731.2159827-1-luc@lmichel.fr> References: <20200925101731.2159827-1-luc@lmichel.fr> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=lmichel.fr; s=pharaoh; t=1601029040; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=YOuCNbOOvSsStZNfbQT6hnxWhxzA58znlB/MmjZ2y5Y=; b=bo65Qd9oZX9y5njzIvy/q/o7FobEiPuAX8wXitUrkGEQNS11R9Hf6bO8kxDEqAV3nAhRTB 6T2fnpDuWcg9KJZjMp8Y81UZKyK5A2aOaHs8QIhWhuDshZOlTe3wR5yAmH7IMBjmbdGm5d 29ejZSqzmVV4XrEInL/0SvDHmiRD/1O2hdiLuWYNEOsVkcxVE+7qdDggQBSKfGQaAbrYuX QDJ8HbLKkvhHR0eVZUBfLSyAdGi9vkFvsCusS+wrs4wqxIZ1e9VFjOBdI5TbabFNKQfDVu yqdHMAUbUW5c/ZSeKgXOsJ9sPo4cexS95VKaZtkw3rcg2Frgzy0WZtBoL+idPQ== ARC-Seal: i=1; s=pharaoh; d=lmichel.fr; t=1601029040; a=rsa-sha256; cv=none; b=GGDkSOnTdXoBFQ9yRk9piF5O1J/EAg7hbZwHfCxkXhQ+b1DbGL3OaiyGSm/2d0+YYkfAHJuSpw1JXVU6hlyXxHVnDYccaxmEqWf314fihXJp5mkS5meMyGmcDpUC0Ukx79Jo5uOHCbG1J1Cukf7T2Css9BhP6MBgfW34cbtNFkmKXAcK5MHnDaOdMpXeTdppk/0xFfYb50Iao6rARHpMqZkEkjBFNyCro5h7dDjDNw82qm+tYSa+78QR/Q2xKNfYSjWXVJz7yrLC0Ht0SDL5Hml8pjTf7NzGHdB8JXyHjBcVQrv/9juVniTOPhFjEhRytrj2Pi7ibyDCWkRbLpoGvw== ARC-Authentication-Results: i=1; pharaoh.lmichel.fr Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=149.202.28.74; envelope-from=luc@lmichel.fr; helo=pharaoh.lmichel.fr X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/25 06:17:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , qemu-arm@nongnu.org, Luc Michel , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Andrew Baumann Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" A clock mux can be configured to select one of its 10 sources through the cm_ctl register. It also embeds yet another clock divider, composed of an integer part and a fractionnal part. The number of bits of each part is mux dependant. Signed-off-by: Luc Michel Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/misc/bcm2835_cprman.c | 43 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/hw/misc/bcm2835_cprman.c b/hw/misc/bcm2835_cprman.c index 8df2db0fd9..75bc11939b 100644 --- a/hw/misc/bcm2835_cprman.c +++ b/hw/misc/bcm2835_cprman.c @@ -229,19 +229,60 @@ static const TypeInfo cprman_pll_channel_info =3D { }; =20 =20 /* clock mux */ =20 +static bool clock_mux_is_enabled(CprmanClockMuxState *mux) +{ + return FIELD_EX32(*mux->reg_cm, CM_CLOCKx_CTL, ENABLE); +} + static void clock_mux_update(CprmanClockMuxState *mux) { - clock_update(mux->out, 0); + uint64_t freq, div; + uint32_t src =3D FIELD_EX32(*mux->reg_cm, CM_CLOCKx_CTL, SRC); + bool enabled =3D clock_mux_is_enabled(mux); + + *mux->reg_cm =3D FIELD_DP32(*mux->reg_cm, CM_CLOCKx_CTL, BUSY, enabled= ); + + if (!enabled) { + clock_update(mux->out, 0); + return; + } + + freq =3D clock_get_hz(mux->srcs[src]); + + if (mux->int_bits =3D=3D 0 && mux->frac_bits =3D=3D 0) { + clock_update_hz(mux->out, freq); + return; + } + + /* + * The divider has an integer and a fractional part. The size of each = part + * varies with the muxes (int_bits and frac_bits). Both parts are + * concatenated, with the integer part always starting at bit 12. + */ + div =3D mux->reg_cm[1] >> (R_CM_CLOCKx_DIV_FRAC_LENGTH - mux->frac_bit= s); + div &=3D (1 << (mux->int_bits + mux->frac_bits)) - 1; + + freq =3D (freq << mux->frac_bits) / div; + + clock_update_hz(mux->out, freq); } =20 static void clock_mux_src_update(void *opaque) { CprmanClockMuxState **backref =3D opaque; CprmanClockMuxState *s =3D *backref; + CprmanClockMuxSource src =3D backref - s->backref; + uint32_t current_src; + + current_src =3D FIELD_EX32(*s->reg_cm, CM_CLOCKx_CTL, SRC); + + if (current_src !=3D src) { + return; + } =20 clock_mux_update(s); } =20 static void clock_mux_init(Object *obj) --=20 2.28.0