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: 1463575 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org (client-ip=2404:9400:2:0:216:3eff:fee1:b9f1; helo=lists.ozlabs.org; envelope-from=openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=KJPZy0Aj; dkim-atps=neutral Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2404:9400:2:0:216:3eff:fee1:b9f1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4FG3Kh1fxrz9sPf for ; Thu, 8 Apr 2021 11:18:00 +1000 (AEST) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4FG3Kh0cwHz30L3 for ; Thu, 8 Apr 2021 11:18:00 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=KJPZy0Aj; dkim-atps=neutral X-Original-To: openbmc@lists.ozlabs.org Delivered-To: openbmc@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=bewilderbeest.net (client-ip=71.19.156.171; helo=thorn.bewilderbeest.net; envelope-from=zev@bewilderbeest.net; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=bewilderbeest.net header.i=@bewilderbeest.net header.a=rsa-sha256 header.s=thorn header.b=KJPZy0Aj; dkim-atps=neutral Received: from thorn.bewilderbeest.net (thorn.bewilderbeest.net [71.19.156.171]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4FG3JV4Dhzz2xfp; Thu, 8 Apr 2021 11:16:58 +1000 (AEST) 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 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-BeenThere: openbmc@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Development list for OpenBMC List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-aspeed@lists.ozlabs.org, Zev Weiss , Andrew Jeffery , Greg Kroah-Hartman , openbmc@lists.ozlabs.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, Jiri Slaby , linux-arm-kernel@lists.infradead.org Errors-To: openbmc-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "openbmc" 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);