From patchwork Thu Apr 8 01:16:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zev Weiss X-Patchwork-Id: 12189619 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 B14FDC433B4 for ; Thu, 8 Apr 2021 01:18:59 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5922B610F9 for ; Thu, 8 Apr 2021 01:18:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5922B610F9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=bewilderbeest.net Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yS/KviZU+qr+UUyS+smSNOyE77DdltRrNHUcV3TZ1J8=; b=EmKi1ghhs61cmfg9kh2t/CF3L 6F0aS30MUzeLu2vWkwcZGHyVkkXf7/9RlE4I3OGD2+RKtjc/ao4HtUPMrLLmQX8iKuQAf8p+UO3N7 wIGPSd2L0aaO3KXMaqmwKzDBzPxdNwcDgUi01CyNJKirGMO3bLohEVvvROQOJDCH4SqaDiVlyWQ0f J9p/7nb7d/DMbPv9x8zpzqGSKO3R6jfQ9vQdFVeLedSNT3+CLGGlBhxUV6IjCg3pQdKXFTpIkubRM 8MuMgTfC1w9YUAKJZMlf/1yvT7mouxoqRMz+2kWkvy/riAfqp8wcSuxnRexzOrL0rTYJWThwMbRiu Mg+jGmUJw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lUJIQ-006SLh-K6; Thu, 08 Apr 2021 01:17:22 +0000 Received: from thorn.bewilderbeest.net ([71.19.156.171]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lUJI2-006SI3-FT for linux-arm-kernel@lists.infradead.org; Thu, 08 Apr 2021 01:17:03 +0000 Received: from hatter.bewilderbeest.net (unknown [IPv6:2600:6c44:7f:ba20::7c6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: zev) by thorn.bewilderbeest.net (Postfix) with ESMTPSA id 5BDDC682; Wed, 7 Apr 2021 18:16:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bewilderbeest.net; s=thorn; t=1617844617; bh=dkNOm/h1qSphcHi2Oe/aIN2quBfOKYQTuInyf8XmA4o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KJPZy0AjnrRHhfXKq6Srf+4ZZ9w8jrazvwRePQg9XR9alRyfmEq1wUg2Jj2cae3eO N2tR+ZxaydoGj1rndC3Wc4hejvrLVAAjhugKD4P6BUb4Ct7eS9ByEkBGFrFzVD8nEd NjHEhpxSPlpP1DbM6lqiJSYSsX09DiKDi3v18uHQ= From: Zev Weiss To: Joel Stanley Cc: openbmc@lists.ozlabs.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org, Andrew Jeffery , Zev Weiss , Greg Kroah-Hartman , Jiri Slaby , linux-serial@vger.kernel.org Subject: [PATCH v5 2/4] drivers/tty/serial/8250: refactor sirq and lpc address setting code Date: Wed, 7 Apr 2021 20:16:35 -0500 Message-Id: <20210408011637.5361-3-zev@bewilderbeest.net> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210408011637.5361-1-zev@bewilderbeest.net> References: <20210408011637.5361-1-zev@bewilderbeest.net> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210408_021659_736574_95006FB4 X-CRM114-Status: GOOD ( 11.86 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This splits dedicated aspeed_vuart_set_{sirq,lpc_address}() functions out of the sysfs store functions in preparation for adding DT properties that will be poking the same registers. While we're at it, these functions now provide some basic bounds-checking on their arguments. Signed-off-by: Zev Weiss Reviewed-by: Andrew Jeffery --- drivers/tty/serial/8250/8250_aspeed_vuart.c | 51 ++++++++++++++------- 1 file changed, 35 insertions(+), 16 deletions(-) diff --git a/drivers/tty/serial/8250/8250_aspeed_vuart.c b/drivers/tty/serial/8250/8250_aspeed_vuart.c index c33e02cbde93..8433f8dbb186 100644 --- a/drivers/tty/serial/8250/8250_aspeed_vuart.c +++ b/drivers/tty/serial/8250/8250_aspeed_vuart.c @@ -72,22 +72,31 @@ static ssize_t lpc_address_show(struct device *dev, return snprintf(buf, PAGE_SIZE - 1, "0x%x\n", addr); } +static int aspeed_vuart_set_lpc_address(struct aspeed_vuart *vuart, u32 addr) +{ + if (addr > U16_MAX) + return -EINVAL; + + writeb(addr >> 8, vuart->regs + ASPEED_VUART_ADDRH); + writeb(addr >> 0, vuart->regs + ASPEED_VUART_ADDRL); + + return 0; +} + static ssize_t lpc_address_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct aspeed_vuart *vuart = dev_get_drvdata(dev); - unsigned long val; + u32 val; int err; - err = kstrtoul(buf, 0, &val); + err = kstrtou32(buf, 0, &val); if (err) return err; - writeb(val >> 8, vuart->regs + ASPEED_VUART_ADDRH); - writeb(val >> 0, vuart->regs + ASPEED_VUART_ADDRL); - - return count; + err = aspeed_vuart_set_lpc_address(vuart, val); + return err ? : count; } static DEVICE_ATTR_RW(lpc_address); @@ -105,27 +114,37 @@ static ssize_t sirq_show(struct device *dev, return snprintf(buf, PAGE_SIZE - 1, "%u\n", reg); } +static int aspeed_vuart_set_sirq(struct aspeed_vuart *vuart, u32 sirq) +{ + u8 reg; + + if (sirq > (ASPEED_VUART_GCRB_HOST_SIRQ_MASK >> ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT)) + return -EINVAL; + + sirq <<= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT; + sirq &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK; + + reg = readb(vuart->regs + ASPEED_VUART_GCRB); + reg &= ~ASPEED_VUART_GCRB_HOST_SIRQ_MASK; + reg |= sirq; + writeb(reg, vuart->regs + ASPEED_VUART_GCRB); + + return 0; +} + static ssize_t sirq_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct aspeed_vuart *vuart = dev_get_drvdata(dev); unsigned long val; int err; - u8 reg; err = kstrtoul(buf, 0, &val); if (err) return err; - val <<= ASPEED_VUART_GCRB_HOST_SIRQ_SHIFT; - val &= ASPEED_VUART_GCRB_HOST_SIRQ_MASK; - - reg = readb(vuart->regs + ASPEED_VUART_GCRB); - reg &= ~ASPEED_VUART_GCRB_HOST_SIRQ_MASK; - reg |= val; - writeb(reg, vuart->regs + ASPEED_VUART_GCRB); - - return count; + err = aspeed_vuart_set_sirq(vuart, val); + return err ? : count; } static DEVICE_ATTR_RW(sirq);