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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id q76sm7555778wme.1.2022.02.21.01.28.14 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Feb 2022 01:28:14 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=aSTeDwPaqQEtMzC2ib6lB1DqSTk7wFZjV/NwlrctUvU=; b=VwvD+e6YYlNpw7aZujS0iO3BOQzbcwCDe5Aaml85cHtOgwFtIttgcVySu1SykLUWvD 8Vs0YfiRQHBpvoPN7XJx8cpDx0OCmwUMLrecuovnfSmNBsr50wu2IvGqEn8W2pjmKEWr z/blQGsgiGnBcnAnmh8dKPvIKR1xvPfZdzc+zdh0zUo/q76baGsPCF2L9lb0LXuDhz/I tGfUUxRk9pe/1NesHb7EOiz1792Y23TXW9xIycoijLByEH6xcAmRMOL8yZ+tuJPQLVOu vZTohJtD6NybYDwCq9yaEd7ZK3Mhgzpxs/VdEYL6h7PkJWe4CreG+6HQ9nBadC5E+0dY uFGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=aSTeDwPaqQEtMzC2ib6lB1DqSTk7wFZjV/NwlrctUvU=; b=kBkj3mxp7bK8xkCD1M3VQNdwf6QAotx8Jlc6SsgSMgnHmUzQjeZDyEgfnihflsKO9O IFvdZpVnu3cpFppwXrwdUwfk76GOHa3R8A5/pZUoId/FXOIcNMAfHs06tu0iimFgG4oC 8XoSk5zvriOF9U2o72zzWHyLVE/XiJdmbg34HUmpqIZfrAK5gDxPa5FGIZQnTHB6R+SP Coj5ZMSSOs7gRi1R5yk9vwayYfo/ycxkGi+QEa+kNdjBxBX/ucODT5KDKDcotYhimxzm 3FN2pxqZES5WCheXVbeeKJL56s+XTI17ItkEIGCSmYz5E5eT6qrFXLjtnN/ODSTyZKC7 CaXQ== X-Gm-Message-State: AOAM532zO65Ls9uoa9YPs776rZh1loDxz+5xsHK8tx9JNOX5KySl+A3j /31DbTKQiVH2uVEcy42Ct9OHTgj1nUv6Cg== X-Google-Smtp-Source: ABdhPJz4/M9OisADGbvP2CUPJ4xrKUqCEJoD0a+i6xCisZY944Nom6tDfJt9Eg3ZXtpgmRCS7RYubQ== X-Received: by 2002:a05:600c:3d13:b0:37b:b8e5:ed80 with SMTP id bh19-20020a05600c3d1300b0037bb8e5ed80mr20136491wmb.183.1645435694690; Mon, 21 Feb 2022 01:28:14 -0800 (PST) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 15/26] hw/arm/armv7m: Handle disconnected clock inputs Date: Mon, 21 Feb 2022 09:27:49 +0000 Message-Id: <20220221092800.404870-16-peter.maydell@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220221092800.404870-1-peter.maydell@linaro.org> References: <20220221092800.404870-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::331 (failed) 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=2a00:1450:4864:20::331; envelope-from=peter.maydell@linaro.org; helo=mail-wm1-x331.google.com X-Spam_score_int: -6 X-Spam_score: -0.7 X-Spam_bar: / X-Spam_report: (-0.7 / 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, PDS_HP_HELO_NORDNS=0.659, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1645437151807100001 In the armv7m object, handle clock inputs that aren't connected. This is always an error for 'cpuclk'. For 'refclk' it is OK for this to be disconnected, but we need to handle it by not trying to connect a sourceless-clock to the systick device. This fixes a bug where on the mps2-an521 and similar boards (which do not have a refclk) the systick device incorrectly reset with SYST_CSR.CLKSOURCE 0 ("use refclk") rather than 1 ("use CPU clock"). Cc: qemu-stable@nongnu.org Reported-by: Richard Petri Signed-off-by: Peter Maydell Reviewed-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson Message-id: 20220208171643.3486277-1-peter.maydell@linaro.org --- hw/arm/armv7m.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/hw/arm/armv7m.c b/hw/arm/armv7m.c index ceb76df3cd4..41cfca0f223 100644 --- a/hw/arm/armv7m.c +++ b/hw/arm/armv7m.c @@ -284,6 +284,12 @@ static void armv7m_realize(DeviceState *dev, Error **e= rrp) return; } =20 + /* cpuclk must be connected; refclk is optional */ + if (!clock_has_source(s->cpuclk)) { + error_setg(errp, "armv7m: cpuclk must be connected"); + return; + } + memory_region_add_subregion_overlap(&s->container, 0, s->board_memory,= -1); =20 s->cpu =3D ARM_CPU(object_new_with_props(s->cpu_type, OBJECT(s), "cpu", @@ -420,8 +426,18 @@ static void armv7m_realize(DeviceState *dev, Error **e= rrp) &s->sysreg_ns_mem); } =20 - /* Create and map the systick devices */ - qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "refclk", s->refc= lk); + /* + * Create and map the systick devices. Note that we only connect + * refclk if it has been connected to us; otherwise the systick + * device gets the wrong answer for clock_has_source(refclk), because + * it has an immediate source (the ARMv7M's clock object) but not + * an ultimate source, and then it won't correctly auto-select the + * CPU clock as its only possible clock source. + */ + if (clock_has_source(s->refclk)) { + qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "refclk", + s->refclk); + } qdev_connect_clock_in(DEVICE(&s->systick[M_REG_NS]), "cpuclk", s->cpuc= lk); if (!sysbus_realize(SYS_BUS_DEVICE(&s->systick[M_REG_NS]), errp)) { return; @@ -438,8 +454,10 @@ static void armv7m_realize(DeviceState *dev, Error **e= rrp) */ object_initialize_child(OBJECT(dev), "systick-reg-s", &s->systick[M_REG_S], TYPE_SYSTICK); - qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "refclk", - s->refclk); + if (clock_has_source(s->refclk)) { + qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "refclk", + s->refclk); + } qdev_connect_clock_in(DEVICE(&s->systick[M_REG_S]), "cpuclk", s->cpuclk); =20 --=20 2.25.1