From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 412ECC433F5 for ; Sat, 21 May 2022 13:14:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1354918AbiEUNOn (ORCPT ); Sat, 21 May 2022 09:14:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33754 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243648AbiEUNNx (ORCPT ); Sat, 21 May 2022 09:13:53 -0400 Received: from mail-pl1-x633.google.com (mail-pl1-x633.google.com [IPv6:2607:f8b0:4864:20::633]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C468339B80 for ; Sat, 21 May 2022 06:13:47 -0700 (PDT) Received: by mail-pl1-x633.google.com with SMTP id q4so9411051plr.11 for ; Sat, 21 May 2022 06:13:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=egjC6NgwBLWYIyKnRSW+X/wYthcyg40wdtxiZu51vtc=; b=Eri97N4csdJvg9j8fzgy7MS1YyQ+NxThLJw+0XcBkwt0rJ1Yl0MhA7CKtyi3sFq4/3 ULDf/1UNk03mIhAcJHfX7ygdKGmgIuMQCynaG7TnOKget9/Bz3FkKGmA7RcApHDDfMn0 ruE2gs/UdKz88zxVSTbSzTgfIUVN4tHFGwD49EwfHsRcBRj+NrUV9EoNwsyyd2ptsFeU F688McRuRwqfX7YU3NsutYHF3bkqt6xMcDnzCunYHdsYLrYcJMocb5VV4TEB94yz2SJ/ 5JOgRW0ngIxg/Aj0RLNItndbolIiTuDWWUJmCgV+xXtd5fse1Jw4rouMplXomwJKTVOs WwaA== 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=egjC6NgwBLWYIyKnRSW+X/wYthcyg40wdtxiZu51vtc=; b=5B6uyoVPF9uvRnGOBDWo8xpswkIneYnXh4B65s2Zk7RX/hKWdnCzci0f5wQNFqeTLf Pjexsug9E5qkfX4yRbnJrYDHGnr/WLVYlejWD3JSHLo69cSG/Np7n/Vph5iLm3R8VQoQ AbZT2b56RkxNDIUrZLf3m61gdARQSRU9POqPw52UQ76D0mf2yKtWw34OIbKCpVeWEkL/ NlFhiEaTet11zwZfrABJ7LYqRxWcTbg9gYcUUR8P/Eiwu6nKb/0oPu1KKT/AbWt6S0s8 3HfOO1k9ynYUIC0d9ScLEY++9Db34bJJrYf5gsxnuwbaWiOFWz8MvMfRfemUQ7dyWWx/ cNdA== X-Gm-Message-State: AOAM5314BtdtQYoQStgfnys5PdZ9ch8xZFLocn/Eu5qW/m3yhP30ZDWd u6a9qMjihQZerobYBjEeS7He7DhMXko= X-Google-Smtp-Source: ABdhPJxkPxXSelXTcn/TSy5d8joziO5MtffGIlNjryF2zLVJkVfnQdR0EZUMgSBwiqMSUdHFgvcSmQ== X-Received: by 2002:a17:90b:1482:b0:1df:5b39:8a4 with SMTP id js2-20020a17090b148200b001df5b3908a4mr17034745pjb.233.1653138826467; Sat, 21 May 2022 06:13:46 -0700 (PDT) Received: from localhost ([2409:10:24a0:4700:e8ad:216a:2a9d:6d0c]) by smtp.gmail.com with ESMTPSA id p19-20020a1709028a9300b00161a9df4de8sm1566514plo.145.2022.05.21.06.13.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 21 May 2022 06:13:45 -0700 (PDT) From: Stafford Horne To: LKML Cc: Openrisc , Stafford Horne , Jonas Bonn , Stefan Kristiansson , Randy Dunlap Subject: [PATCH v3 03/13] openrisc: Add support for liteuart emergency printing Date: Sat, 21 May 2022 22:13:13 +0900 Message-Id: <20220521131323.631209-4-shorne@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220521131323.631209-1-shorne@gmail.com> References: <20220521131323.631209-1-shorne@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds support for sending emergency print output, such as unhandled exception details, to a liteuart serial device. This is the default device available on litex platforms. If a developer want to use this they should update UART_BASE_ADD to the address of liteuart. Signed-off-by: Stafford Horne --- arch/openrisc/kernel/head.S | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) diff --git a/arch/openrisc/kernel/head.S b/arch/openrisc/kernel/head.S index 7bfa6e4b60c5..21db50563f97 100644 --- a/arch/openrisc/kernel/head.S +++ b/arch/openrisc/kernel/head.S @@ -1555,7 +1555,18 @@ ENTRY(_emergency_putc) l.movhi r4,hi(UART_BASE_ADD) l.ori r4,r4,lo(UART_BASE_ADD) -#if defined(CONFIG_SERIAL_8250) +#if defined(CONFIG_SERIAL_LITEUART) + /* Check OFF_TXFULL status */ +1: l.lwz r5,4(r4) + l.andi r5,r5,0xff + l.sfnei r5,0 + l.bf 1b + l.nop + + /* Write character */ + l.andi r7,r7,0xff + l.sw 0(r4),r7 +#elif defined(CONFIG_SERIAL_8250) /* Check UART LSR THRE (hold) bit */ l.addi r6,r0,0x20 1: l.lbz r5,5(r4) -- 2.31.1