From patchwork Thu Dec 24 15:49:49 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Timur Tabi X-Patchwork-Id: 7918881 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 51A4FBEEED for ; Thu, 24 Dec 2015 15:51:59 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 59A6E205EA for ; Thu, 24 Dec 2015 15:51:58 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 62D4C204FF for ; Thu, 24 Dec 2015 15:51:57 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1aC89p-0005Oh-Do; Thu, 24 Dec 2015 15:50:25 +0000 Received: from smtp.codeaurora.org ([198.145.29.96]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aC89e-00049F-SL for linux-arm-kernel@lists.infradead.org; Thu, 24 Dec 2015 15:50:15 +0000 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 15D4760326; Thu, 24 Dec 2015 15:49:54 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 00CA760319; Thu, 24 Dec 2015 15:49:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from timur-ubuntu.qualcomm.com (rrcs-67-52-129-61.west.biz.rr.com [67.52.129.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: timur@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 76C5760313; Thu, 24 Dec 2015 15:49:52 +0000 (UTC) From: Timur Tabi To: Greg Kroah-Hartman , Russell King , andre.przywara@arm.com, Linus Walleij , andrew.jackson@arm.com, jslaby@suse.com, jun.nie@linaro.org, shijie.huang@arm.com, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org, peter@hurleysoftware.com Subject: [PATCH 2/2] tty: amba-pl011: use iotype instead of access_32b to track 32-bit I/O Date: Thu, 24 Dec 2015 09:49:49 -0600 Message-Id: <1450972189-22639-2-git-send-email-timur@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1450972189-22639-1-git-send-email-timur@codeaurora.org> References: <1450972189-22639-1-git-send-email-timur@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20151224_075015_118130_7D8DC2E3 X-CRM114-Status: GOOD ( 17.88 ) X-Spam-Score: -2.6 (--) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Instead of defining a new field in the uart_amba_port structure, use the existing iotype field of the uart_port structure, which is intended for this purpose. If we need to use 32-bit register access, we set iotype to UPIO_MEM32, otherwise we set it to UPIO_MEM. For early console, specify the "mmio32" option on the kernel command-line. Example: earlycon=pl011,mmio32,0x3ced1000 Signed-off-by: Timur Tabi --- Documentation/kernel-parameters.txt | 5 ++++- drivers/tty/serial/amba-pl011.c | 16 +++++++++------- 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 474ce69..ab11d5c 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -995,10 +995,13 @@ bytes respectively. Such letter suffixes can also be entirely omitted. unspecified, the h/w is not initialized. pl011, + pl011,mmio32, Start an early, polled-mode console on a pl011 serial port at the specified address. The pl011 serial port must already be setup and configured. Options are not - yet supported. + yet supported. If 'mmio32' is specified, then only + the driver will use only 32-bit accessors to read/write + the device registers. msm_serial, Start an early, polled-mode console on an msm serial diff --git a/drivers/tty/serial/amba-pl011.c b/drivers/tty/serial/amba-pl011.c index 06f827a..f2793c1 100644 --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -239,7 +239,6 @@ struct uart_amba_port { unsigned int fifosize; /* vendor-specific */ unsigned int old_cr; /* state during shutdown */ bool autorts; - bool access_32b; unsigned int fixed_baud; /* vendor-set fixed baud rate */ char type[12]; #ifdef CONFIG_DMA_ENGINE @@ -263,7 +262,8 @@ static unsigned int pl011_read(const struct uart_amba_port *uap, { void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg); - return uap->access_32b ? readl_relaxed(addr) : readw_relaxed(addr); + return (uap->port.iotype == UPIO_MEM32) ? + readl_relaxed(addr) : readw_relaxed(addr); } static void pl011_write(unsigned int val, const struct uart_amba_port *uap, @@ -271,7 +271,7 @@ static void pl011_write(unsigned int val, const struct uart_amba_port *uap, { void __iomem *addr = uap->port.membase + pl011_reg_to_offset(uap, reg); - if (uap->access_32b) + if (uap->port.iotype == UPIO_MEM32) writel_relaxed(val, addr); else writew_relaxed(val, addr); @@ -2304,7 +2304,10 @@ static void pl011_putc(struct uart_port *port, int c) { while (readl(port->membase + UART01x_FR) & UART01x_FR_TXFF) ; - writeb(c, port->membase + UART01x_DR); + if (port->iotype == UPIO_MEM32) + writel(c, port->membase + UART01x_DR); + else + writeb(c, port->membase + UART01x_DR); while (readl(port->membase + UART01x_FR) & UART011_FR_BUSY) ; } @@ -2417,7 +2420,6 @@ static int pl011_setup_port(struct device *dev, struct uart_amba_port *uap, uap->port.dev = dev; uap->port.mapbase = mmiobase->start; uap->port.membase = base; - uap->port.iotype = UPIO_MEM; uap->port.fifosize = uap->fifosize; uap->port.flags = UPF_BOOT_AUTOCONF; uap->port.line = index; @@ -2471,9 +2473,9 @@ static int pl011_probe(struct amba_device *dev, const struct amba_id *id) return PTR_ERR(uap->clk); uap->reg_offset = vendor->reg_offset; - uap->access_32b = vendor->access_32b; uap->vendor = vendor; uap->fifosize = vendor->get_fifosize(dev); + uap->port.iotype = vendor->access_32b ? UPIO_MEM32 : UPIO_MEM; uap->port.irq = dev->irq[0]; uap->port.ops = &amba_pl011_pops; @@ -2552,9 +2554,9 @@ static int sbsa_uart_probe(struct platform_device *pdev) return -ENOMEM; uap->reg_offset = vendor_sbsa.reg_offset; - uap->access_32b = vendor_sbsa.access_32b; uap->vendor = &vendor_sbsa; uap->fifosize = 32; + uap->port.iotype = vendor_sbsa.access_32b ? UPIO_MEM32 : UPIO_MEM; uap->port.irq = platform_get_irq(pdev, 0); uap->port.ops = &sbsa_uart_pops; uap->fixed_baud = baudrate;